JP5130243B2 - Disc brake and manufacturing method thereof - Google Patents

Abstract

Provided are a disc brake which can be obtained with increased manufacturing efficiency, and a method of manufacturing the disc brake. A ramp member (65) having a plate-like section (71) is provided to a ball-and-ramp mechanism. The ramp member (65) has ramp grooves (75) formed in one end surface (71A) of the plate-like section (71) so as to extend in the circumferential direction and having tilted bottom sections with which balls make contact. Recessed sections (301) are formed in said end surface (71A) at portions other than the portions in which the ramp grooves (75) are formed, and each recessed section (301) is provided around each ramp groove (75) and is recessed toward edges (75d-75f) of the ramp groove (75).

Description

  The present invention relates to a disc brake and a manufacturing method thereof.

  There is a disc brake having a ball-and-ramp mechanism for propelling a piston by changing a rotational force into a linear driving force (see, for example, Patent Document 1).

JP2003-156085A

  In the above-described disc brake, it is necessary to assemble the ball-and-ramp mechanism by putting the ball in the lamp groove and aligning the lamp groove.

  Accordingly, an object of the present invention is to provide a disc brake that can be easily manufactured and a manufacturing method thereof.

  In order to achieve the above object, according to the present invention, a recessed portion that is recessed toward the edge of the lamp groove is formed around the lamp groove of the lamp member.

  According to the present invention, the manufacturing efficiency of the disc brake can be improved.

1 is a side sectional view showing a disc brake of a first embodiment according to the present invention. It is a partial expanded side sectional view which shows the principal part of the disc brake of 1st Embodiment which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS The disc brake actuator which comprises the disc brake of 1st Embodiment which concerns on this invention is shown, (a) is a side view, (b) is side sectional drawing. The fixed ramp member which comprises the disc brake of 1st Embodiment which concerns on this invention is shown, (a) is a top view, (b) is a B1 arrow directional view of (a), (c) is (a). It is C1 arrow line view. 4A and 4B show a fixed ramp member constituting the disc brake according to the first embodiment of the present invention, in which FIG. 4A is a cross-sectional view taken along line a1-a1 in FIG. 4A, and FIG. It is b1 sectional drawing. It is a perspective view which shows the movement ramp member which comprises the disc brake of 1st Embodiment which concerns on this invention. The push rod which comprises the disc brake of 1st Embodiment which concerns on this invention is shown, (a) is a side view, (b) is B2 arrow directional view of (a). The cover member which comprises the disc brake of 1st Embodiment which concerns on this invention is shown, (a) is a top view, (b) is a B3 arrow view of (a), (c) is C3 of (a). It is an arrow view. It is a sectional side view which shows the first half of the assembly procedure of the disc brake actuator which comprises the disc brake of 1st Embodiment which concerns on this invention in order of (a)-(c). It is a sectional side view which shows the second half of the assembly procedure of the disc brake actuator which comprises the disc brake of 1st Embodiment which concerns on this invention in order of (a)-(c). It is a principal part expanded side sectional view which shows the assembly | attachment condition of the actuator for disk brakes to the disk brake of 1st Embodiment which concerns on this invention in order of (a), (b). It is a top view which shows the modification of the fixed ramp member which comprises the disc brake of 1st Embodiment which concerns on this invention. The fixed ramp member which comprises the disc brake of 2nd Embodiment which concerns on this invention is shown, (a) is a top view, (b) is a2-a2 sectional drawing of (a), (c) is (a). It is b2-b2 sectional drawing of. The fixed ramp member which comprises the disc brake of 3rd Embodiment which concerns on this invention is shown, (a) is a top view, (b) is a3-a3 sectional drawing of (a), (b) is (a). It is b3-b3 sectional drawing.

  Embodiments according to the present invention will be described below with reference to the drawings.

“First Embodiment”
1st Embodiment which concerns on this invention is described based on FIGS.

  FIG. 1 is a side sectional view showing the disc brake of the first embodiment. FIG. 2 is a partially enlarged side sectional view showing a main part of the disc brake of the first embodiment. 3A and 3B show a disc brake actuator constituting the disc brake of the first embodiment, wherein FIG. 3A is a side view and FIG. 3B is a side sectional view. FIGS. 4A and 4B show a fixed ramp member constituting the disc brake of the first embodiment, where FIG. 4A is a plan view, FIG. 4B is a view taken along arrow B1 in FIG. 4A, and FIG. It is C1 arrow line view. 5A and 5B show a fixed ramp member constituting the disc brake of the first embodiment. FIG. 5A is a cross-sectional view taken along a1-a1 in FIG. 4A, and FIG. 5B is b1- shown in FIG. It is b1 sectional drawing. FIG. 6 is a perspective view showing a moving ramp member constituting the disc brake of the first embodiment. 7A and 7B show a push rod that constitutes the disc brake of the first embodiment. FIG. 7A is a side view, and FIG. 7B is a view taken in the direction of arrow B2 in FIG. FIGS. 8A and 8B show a cover member constituting the disc brake of the first embodiment, wherein FIG. 8A is a plan view, FIG. 8B is a view taken along arrow B3 in FIG. 8A, and FIG. 8C is C3 in FIG. It is an arrow view. FIG. 9 is a side sectional view showing the first half of the assembly procedure of the disc brake actuator constituting the disc brake of the first embodiment in the order of (a) to (c). FIG. 10 is a side sectional view showing the second half of the assembly procedure of the disc brake actuator constituting the disc brake of the first embodiment in the order of (a) to (c). FIG. 11 is an enlarged cross-sectional side view of a main part showing the state of assembly of the disc brake actuator to the disc brake of the first embodiment in the order of (a) and (b). FIG. 12 is a plan view showing a modification of the fixed ramp member constituting the disc brake of the first embodiment.

  As shown in FIG. 1, the disc brake 10 of the first embodiment is slidably supported in a state of being disposed on both sides via a disc 12 on a carrier (not shown) fixed to a non-rotating portion of the vehicle. A pair of pads 13 and a caliper 14 supported by the carrier so as to be slidable along the axial direction of the disk 12 and sandwiching the pair of pads 13 from both sides.

  The caliper 14 has a cylinder tube portion 15 and a cylinder bottom portion (bottom portion) 16 that closes one end of the cylinder tube portion 15, and has a bottomed tube in which the cylinder opening portion 17 is opposed to the disk 12 of one pad 13 on the opposite side. Cylinder 18, a disk path portion 19 extending from one side of the cylinder 18 in the radial direction across the outer periphery of the disk 12, and the other pad 13 from the opposite side of the cylinder 18 of the disk path portion 19. A caliper member 21 having a claw portion 20 extending so as to face the opposite side of the disc 12 is provided. The inner peripheral surface of the cylinder tube portion 15 is referred to as a bore 22.

  A central through hole 26 penetrating along the axial direction of the bore 22 is formed in the cylinder bottom portion 16 of the caliper member 21 at the center position of the bore 22, and outside the central through hole 26 in the radial direction of the bore 22. A pin hole 27 is formed at a position from the bore 22 side to a predetermined depth position. A cylindrical stop pin 28 is fitted in the pin hole 27. The central through hole 26 has a stepped shape including a main hole 29 and a large-diameter hole 30 formed at the end of the main hole 29 on the bore 22 side. A cylindrical portion 31 that is coaxial with the central through hole 26 is formed outside the cylinder bottom portion 16. Further, a guide member 32 for locking a cable (not shown) connected to an operating member 112 described later is attached to the outside of the cylinder bottom portion 16.

  Further, the bore 22 of the cylinder tube portion 15 of the caliper member 21 is formed with a fitting hole 35 having a constant diameter closest to the cylinder bottom portion 16, and in the vicinity of the end of the fitting hole 35 on the cylinder opening portion 17 side. An annular ring groove 36 having a diameter larger than that of the fitting hole 35 is formed coaxially. Further, in the bore 22 of the cylinder tube portion 15, an intermediate hole 37 having a larger diameter than the fitting hole 35 and the ring groove 36 is formed coaxially on the cylinder opening 17 side with respect to the ring groove 36. A sliding hole 38 having a smaller diameter than the intermediate hole 37 and a larger diameter than the fitting hole 35 and the ring groove 36 is formed closer to the cylinder opening 17 than the intermediate hole 37. Further, an annular seal groove 39 having a diameter larger than that of the fitting hole 35 is coaxially formed in the bore 22 of the cylinder cylindrical portion 15 in the vicinity of the end portion of the sliding hole 38 on the cylinder opening portion 17 side. An annular boot groove 40 having a diameter larger than that of the fitting hole 35 is coaxially formed on the cylinder opening 17 side of the seal groove 39. A tapered chamfer 41 is formed at the position of the cylinder opening 17. In this embodiment, the sliding hole 38 has a larger diameter than the fitting hole 35 and the ring groove 36. However, the present invention is not limited to this, and the sliding hole 38 is the same as the fitting hole 35 or the ring groove 36. It is good also as a diameter.

  The caliper 14 is formed in a covered cylinder shape having a cylindrical portion 45 and a lid portion 46, and is slidable in the sliding hole 38 of the cylinder 18 of the caliper member 21 with the lid portion 46 side facing the pad 13 side. The piston 47 to be fitted, the annular piston seal 48 that is held in the seal groove 39 of the cylinder 18 and seals the gap between the piston 47 and the bore 22 of the cylinder 18, and one end of the cylinder 18 described above. The boot groove 40 is fitted into the boot groove 40, and the other end has a stretchable boot 50 fitted into the boot groove 49 in the outer peripheral portion on the lid portion 46 side of the piston 47. On the lid portion 46 side of the piston 47, a through hole 51 penetrating inside and outside is formed so as to open into the boot groove 49, and a boot 50 is attached so as to close the through hole 51.

  The caliper 14 is caused to slide in the sliding hole 38 of the cylinder 18 by the brake hydraulic pressure introduced between the cylinder 18 and the piston 47 and project in the direction of the pad 13 from the cylinder 18. By holding the pair of pads 13 from both sides by the piston 47 and the claw portion 20, the pads 13 are pressed against the disk-shaped disc 12.

  The pair of pads 13 includes a back plate 55 that is held by a carrier (not shown) and pressed by the piston 47 or the claw portion 20, and a friction material 56 that is joined to the back plate 55 and contacts the disk 12. . The pair of pads 13 has a shim 57 attached to the back plate 55 so as to cover it, and abut against the piston 47 or the claw portion 20 via the shim 57.

  As described above, the piston 47 is protruded from the cylinder 18 toward the claw portion 20 by the brake hydraulic pressure introduced into the cylinder 18 from a master cylinder (not shown) during normal braking by depressing the brake pedal. The pair of pads 13 is pressed against the disk 12 to generate a braking force. However, the piston 47 is mechanically protruded into the cylinder 18 instead of such a brake fluid pressure. A parking brake mechanism 61 is provided that presses the disc 12 to generate a braking force.

  As shown in FIG. 2, the parking brake mechanism 61 includes a ball and ramp mechanism 62 that is disposed in the cylinder 18 of the caliper member 21 with a part protruding outward from the central through hole 26 of the cylinder bottom 16. Yes.

  The ball-and-ramp mechanism 62 propels the piston 47 by changing the rotational force into a linear driving force. The ball-and-ramp mechanism 62 is disposed in the cylinder 18 and abuts against the cylinder bottom 16 and a cylinder of the fixed ramp member 65. A ball 66 provided on the side opposite to the bottom portion 16 and a moving ramp member 67 provided so as to interpose the ball 66 between the fixed ramp member 65 are provided.

  The fixed ramp member 65, which is one of the pair of fixed ramp members 65 and the movable ramp member 67, is formed by forging, and has a plate-like disk portion (plate-like portion) 71 that contacts the cylinder bottom 16. The disc portion 71 is formed in a cup shape having a side wall portion 72 that rises at a constant height from the outer peripheral edge of the disc portion 71 on the one side in the axial direction. As shown in FIGS. 3 and 4, the disc portion 71 is formed with a through hole 73 that penetrates in the axial direction at the center thereof, and also between the through hole 73 and the side wall portion 72. As shown in FIG. 2, a through hole 74 for preventing rotation of the fixed ramp member 65 to prevent the caliper 14 from rotating is formed. Further, as shown in FIG. 4A, the one end surface 71 </ b> A on the side wall portion 72 side of the disc portion 71 is located at a position different from the through hole 73 and the through hole 74 in the circumferential direction of the disc portion 71. A plurality of (specifically, three) concentric lamp grooves 75 are formed at equal positions in the circumferential direction while being recessed in the thickness direction of the extending disc portion 71 and changing in depth in the circumferential direction. In the fixed ramp member 65, the balls 66 abut on these ramp grooves 75 as shown in FIG.

  Here, the through hole 74 allows the rotation pin 28 fitted in the pin hole 27 of the cylinder bottom portion 16 to be inserted, whereby the fixed ramp member 65 is prevented from rotating with respect to the cylinder 18. . In other words, the fixed ramp member 65 is provided on the cylinder bottom portion 16 so as not to rotate by the stop pin 28, in other words, the rotation direction is restricted with respect to the cylinder 18 by the through hole 74, and the rotation is impossible.

  As shown in FIG. 4A, the ramp groove 75 is formed in a mirror-symmetric shape with the center in the circumferential direction of the disc portion 71 as the center. The ramp groove 75 is a recess 75a that is deepest at the center in the circumferential direction of the disc portion 71 and can hold the ball 66 so as to slightly restrict the relative movement thereof. As shown in FIG. 5 (a), the concave portion 75a has a circular cross section as a whole in the radial direction of the disc portion 71, and the circumferential cross section of the disc portion 71 is shown in FIG. 5 (b). As shown, it has an arc shape as a whole.

  Further, the ramp groove 75 is formed with inclined portions 75b whose depth becomes shallower as the distance from the concave portion 75a in the circumferential direction is increased on both sides of the concave portion 75a in the circumferential direction of the disc portion 71. These inclined portions 75b have a circular cross section in the circumferential direction of the disc portion 71, and abut the balls 66 that have come out of the recesses 75a and ride on to guide their movement.

  Further, the ramp groove 75 has end raised portions 75c whose depths are sharply shallower than the inclined portions 75b on the outer sides of both inclined portions 75b in the circumferential direction of the disc portion 71 as they are separated in the circumferential direction. Is formed. As shown in FIG. 5 (b), the end raised portions 75c have a circular cross section as a whole in the circumferential direction of the disc portion 71, and are formed from the ramp grooves 75 of the balls 66 moving on the inclined portions 75b. Regulate the escape of From the above, the plurality of ramp grooves 75 are inclined at the bottoms where the balls 66 abut. Further, on the one end surface 71A of the disc portion 71, a thick top portion 300 is formed between adjacent ones of the plurality of lamp grooves 75 in the circumferential direction.

  In addition, as shown in FIG. 4A, the ramp groove 75 has an outer peripheral side edge (edge) 75 d that is the outer side in the radial direction of the disc portion 71 than the center of the disc portion 71. The inner circumferential side edge (edge) 75e in the radial direction of the disc portion 71 is substantially linear and orthogonal to the radius passing through the center of the ramp groove 75. It has become. Further, the ramp groove 75 has an arc shape in which the edge portions (edge portions) 75f on both sides in the circumferential direction of the disc portion 71 smoothly connect the outer peripheral side edge portion 75d and the inner peripheral side edge portion 75e. . The ramp groove 75 regulates the escape of the ball 66 from the ramp groove 75 by the outer peripheral side edge portion 75d, the inner peripheral side edge portion 75e, and both end edge portions 75f that are connected in a circumferential shape.

  In the first embodiment, the one end surface 71A of the disc part 71 other than the lamp groove 75 is formed around the lamp groove 75 on the outer peripheral side edge part 75d, the inner peripheral side edge part 75e, and both sides of the lamp groove 75. A recessed portion 301 is formed that is recessed in the thickness direction of the disc portion 71, which is the same direction as the recessed direction of the lamp groove 75, toward the end edge portion 75f.

  The hollow portion 301 is formed so as to surround the entire periphery of the lamp groove 75, and is a disc portion that is outside the outer peripheral side edge portion 75 d in the radial direction of the disc portion 71 and is the outer peripheral portion of the fixed lamp member 65. The inner periphery of the fixed lamp member 65 is located inside the outer recess 301a formed to be recessed from the outer periphery of 71 toward the outer periphery 75d and the inner periphery 75e in the radial direction of the disc 71. Each of an inner recess 301b formed to be recessed from the inner periphery of the disk portion 71, which is a portion, toward the inner peripheral edge 75e, and both end edges 75f in the circumferential direction of the disc 71 It has the edge dent part 301c of the both sides formed in the outer side, and it is depressed toward the edge part 75f which adjoins from each of the top parts 300 of both sides.

  As shown in FIG. 5 (a), the outer depression 301a has a cross-section that is recessed in an arc shape toward the outer peripheral edge 75d and is connected to the outer peripheral edge 75d. It forms a shape that is recessed in an arc shape toward the inner peripheral side edge 75e and is connected to the inner peripheral side edge 75e, and the cross section of one end recessed portion 301c is on the adjacent side as shown in FIG. The first end edge portion 75f is recessed in an arc shape and connected to the end edge portion 75f, and the cross section of the other end portion recess portion 301c is directed toward the other end edge portion 75f on the adjacent side. It has a shape that is recessed in an arc shape and is connected to the end edge 75f.

  In addition, as shown in FIG. 4A, the recessed portion 301 has an edge 301 d opposite to the ramp groove 75 of the outer recessed portion 301 a in an arc shape concentric with the disc portion 71. The inner recess 301b has an edge 301e opposite to the ramp groove 75, the center of the disc portion 71 in the circumferential direction is concentric with the disc portion 71, and both sides thereof are circular in opposite directions. It has an undulating waveform. Furthermore, the edge part 301f on the opposite side to the ramp groove 75 of the end dent part 301c on both sides has an arc shape that smoothly connects the edge part 301d and the edge part 301e.

  Here, the width of the inner depression 301b in the radial direction of the disc portion 71 is wider than the width of the outer depression 301a in the same direction, and the end depression 301c in the circumferential direction of the disc 71 is larger. It is narrower than the width.

  In addition, the above-described through hole 74 for preventing the fixed lamp member 65 from rotating with respect to the caliper material 21 is formed in the top portion 300 between the adjacent recess portions 301 in the circumferential direction of the disc portion 71. .

  The fixed lamp member 65 is formed with the above-mentioned side wall part 72 projecting from the one end surface 71A in the direction opposite to the recessed direction of the lamp groove 75 at the outer peripheral edge part. As shown in FIG. 4A, an axial hole 78 having a shape extending in the axial direction with a constant width in the circumferential direction and extending to the opposite side of the disc portion 71 is formed in the circumferential direction as shown in FIG. A plurality (specifically, three locations) are formed at equal positions. Further, as shown in FIG. 4C, a hook-shaped hole (locking hole) 79 is formed at a position between all the axial holes 78 adjacent in the circumferential direction. That is, the same number of bowl-shaped holes 79 as the axial holes 78 are formed (specifically, three places).

  The bowl-shaped hole 79 includes an axial hole (first hole) 81 formed in the axial direction from the side opposite to the disk part 71 of the side wall part 72 to the front of the disk part 71, and the axial hole 81. It consists of a radial hole (second hole) 82 that is continuously formed adjacent to the circumferential direction in the axial direction of the side wall 72 in the radial direction. In other words, the axial hole 81 has a shape that extends in the axial direction of the side wall portion 72 to the side opposite to the disc portion 71, and the radial hole 82 is opposite to the disc portion 71 in the axial direction of the side wall portion 72. It has a shape that does not come out to the side. As shown in FIG. 4A, each of the axial holes 81 is formed in correspondence with the ramp groove 75, and is formed in alignment with the ramp groove 75 in the circumferential direction.

  As shown in FIG. 4 (c), due to the axial hole 81 and the radial hole 82 described above, the bowl-shaped hole 79 is a narrow part having a constant width that is narrower in the circumferential direction on the opposite side to the disk part 71. 85, the disk portion 71 side is a wide portion 86 having a constant width wider than the narrow portion 85 in the circumferential direction, and the wide portion 86 and the narrow portion 85 are formed on the side wall portion 72. The positions on one side in the circumferential direction are matched, and the opposite side has a stepped shape. As a result, the side wall 72 is a standing wall having a constant width in the circumferential direction between the side where the narrow portion 85 and the wide portion 86 are continuous and the axial hole 78 and standing in the axial direction of the fixed ramp member 65. A constant width in the circumferential direction between the wide portion 86 and the axial hole 78 on the stepped side of the portion 88, the wide portion 86 and the narrow portion 85, which is erected in the axial direction of the fixed lamp member 65. A standing wall portion 89 and a locking extension wall that extends in the circumferential direction so as to partially cover the wide portion 86 from the end of the standing wall portion 89 opposite to the disk portion 71 to form a narrow portion 85. Part 90. A locking protrusion 91 that protrudes in the direction of the disk portion 71 is formed at the end of the locking extension wall 90 opposite to the standing wall 89. The bottom surface of the wide portion 86 and the bottom surface of the locking extension wall portion 90 are parallel to the bottom surface of the disc portion 71.

  Here, in the fixed lamp member 65, the position of the bottom surface of the wide portion 86 that is the end portion of the flange-shaped hole 79 on the disc portion 71 side is the bottom surface that is the end portion of the axial hole 78 on the disc portion 71 side. It is in the disc part 71 side rather than the position. Further, in the fixed ramp member 65, the height from the disc portion 71 is higher in the standing wall portion 89 in which the locking extension wall portion 90 is formed at the upper portion than the standing wall portion 88 having a constant width. The axis of the fixed lamp member 65 between the lower surface that is the end portion of the locking extension wall 90 on the disk portion 71 side and the upper surface that is the end portion on the opposite side of the disc portion 71 of the standing wall portion 88 having a constant width. The position in the direction matches. Further, in the bowl-shaped hole 79, an axial hole 81 formed in the axial direction is made larger than the diameter of the ball 66, and the ball 66 is fixed to the fixed ramp member via the axial hole 81 from the side wall 72 side. 65, and the ball 66 is inserted in this manner, so that the lamp is formed in the disk portion 71 by aligning the position in the circumferential direction with the axial hole 81 formed in the axial direction. The groove 75 can be arranged by a short distance movement.

  When manufacturing the fixed lamp member 65 described above, a plurality of lamp grooves 75 are formed on one end surface 71A of the disk portion 71, and around the lamp grooves 75 toward the edges 75d to 75f of the lamp grooves 75. A step of forming the recessed portion 301 that is recessed occurs. In this step, the recessed portion 301 of the one end surface 71 </ b> A is formed by forging together with the ramp groove 75. In addition, in this step, a side wall portion 72 protruding from the one end surface 71A in the direction opposite to the recess direction of the lamp groove 75 is formed on the outer periphery of the fixed lamp member 65 together with the lamp groove 75 and the recess portion 301 by forging. Become.

  As shown in FIGS. 2 and 3, the moving ramp member 67 includes a shaft portion 95 and a plate-like disk portion (plate-like portion) that extends coaxially with the shaft portion 95 from one end of the shaft portion 95 in the radial direction. 96, one end surface 96A of the disc portion 96 on the shaft portion 95 side extends in the circumferential direction of the disc portion 96 in the thickness direction of the disc portion 96, as shown in FIG. A plurality of (specifically, three) concentric lamp grooves 97 that are recessed and whose depth changes in the circumferential direction are formed at equal positions in the circumferential direction. In the moving ramp member 67, the balls 66 come into contact with these ramp grooves 97 as shown in FIG.

  The lamp groove 97 has the same shape as the lamp groove 75 of the fixed lamp member 65. As shown in FIG. 6, the ramp groove 97 is formed in a mirror-symmetric shape with the center in the circumferential direction of the disc portion 96 as the center, and the central portion in the circumferential direction of the disc portion 96 is deepest in the ball. 66 is a recess 97a capable of holding 66 so that its relative movement is slightly restricted. The concave portion 97a also has a circular cross section in the radial direction of the disk portion 96 as a whole, and a circular cross section in the circumferential direction of the disk portion 96 as a whole.

  Further, the ramp groove 97 is formed with inclined portions 97b whose depth becomes shallower as the distance from the concave portion 97a in the circumferential direction is increased on both sides of the concave portion 97a in the circumferential direction of the disc portion 96. These inclined portions 97b have a straight cross section in the circumferential direction, and abut the balls 66 that have come out of the recesses 97a and ride on to guide their movement.

  Further, the ramp groove 97 has end raised portions 97c whose depths become shallower than the inclined portions 97b as they are separated in the circumferential direction on both outer sides of the inclined portions 97b in the circumferential direction of the disk portion 96. Is formed. The end standing upper portions 97c also have a circular cross section in the circumferential direction of the disc portion 96 as a whole, and restrict the escape of the ball 66 moving on the inclined portion 97b from the ramp groove 97. From the above, the plurality of ramp grooves 97 are also inclined at the bottoms with which the balls 66 abut. Further, a thick top portion 305 is formed on one end surface 96A of the disc portion 96 between adjacent ones of the plurality of lamp grooves 97 in the circumferential direction.

  In addition, the ramp groove 97 has an arc shape in which the outer peripheral side edge (edge) 97d in the radial direction of the disc portion 96 is arranged closer to the ramp groove 97 side than the center of the disc portion 96. The inner peripheral side edge (edge part) 97e in the radial direction of the disc part 96 is substantially linear and orthogonal to the radius passing through the center of the ramp groove 97. Furthermore, the edge part (edge part) 97f of the both sides in the circumferential direction of the disc part 96 has comprised the circular arc shape which connected the outer peripheral side edge part 97d and the inner peripheral side edge part 97e smoothly. The ramp groove 97 regulates the escape of the ball 66 from the ramp groove 97 by the outer peripheral side edge portion 97d, the inner peripheral side edge portion 97e, and the end edge portions 97f on both sides that are connected in the circumferential shape.

  In the first embodiment, one end surface 96A of the disc portion 96 other than the lamp groove 97 is around the lamp groove 97, and has an outer peripheral side edge portion 97d, an inner peripheral side edge portion 97e, and the like. A recessed portion 306 is formed which is recessed in the plate thickness direction of the disc portion 96, which is the same direction as the recessed direction of the lamp groove 97, toward the edge portions 97f on both sides.

  The recessed portion 306 is formed so as to surround the entire circumference of the ramp groove 97, and is a disc portion that is outside the outer peripheral side edge portion 97 d in the radial direction of the disc portion 96 and is the outer peripheral portion of the moving ramp member 67. The outer recessed portion 306a formed to be recessed from the outer peripheral portion 96 toward the outer peripheral edge portion 97d, and the disc of the fixed lamp member 65 inside the inner peripheral edge portion 97e in the radial direction of the disc portion 96. Each of an inner recessed portion 306b formed to be recessed from the inner peripheral side edge portion 97e of the portion 96 toward the inner peripheral side edge portion 97e, and both end edge portions 97f on both sides in the circumferential direction of the disc portion 96 , And both end dents 306c are formed to be recessed from the respective top portions 305 toward the adjacent edge portions 97f.

  The outer recess 306a has a cross section that is recessed in an arc shape toward the outer peripheral edge 97d and is connected to the outer peripheral edge 97d, and the inner recess 306b has a circular cross section toward the inner peripheral edge 97e. It has a shape that is recessed in an arc shape and connected to the inner peripheral edge portion 97e, and the cross section of one end recess portion 306c is recessed in an arc shape toward one end edge portion 97f on the adjacent side. The cross section of the other end dent 306c has a shape that is depressed in an arc shape toward the other end edge 97f on the adjacent side, and is connected to this end edge 97f.

  In addition, the recess 306 has an edge 306 d opposite to the ramp groove 97 of the outer recess 306 a in an arc shape concentric with the disk portion 96. The inner recess 306b has an edge 306e opposite to the ramp groove 97, the center of the disc 96 in the circumferential direction is concentric with the disc 96, and both sides of the inner recess 306b are oppositely circular. It has an undulating waveform. Further, the edge 306f on the opposite side to the ramp groove 97 of the end dents 306c on both sides has an arc shape that smoothly connects the edge 306d and the edge 306e.

  As shown in FIGS. 2 and 3 (b), a chamfered portion 98 is formed on the outer diameter side and a relief recess 99 is formed in the center on the opposite side of the disc portion 96 of the moving ramp member 67 from the shaft portion 95. ing. The shaft portion 95 of the moving ramp member 67 has an insertion portion 101 having a constant diameter on the disc portion 96 side, and an annular fitting groove 102 is formed on the opposite side of the insertion portion 101 from the disc portion 96. A serration 103 is formed over the entire circumference on the tip side of the joint groove 102, and a male screw 104 is formed on the end portion on the tip side further than the serration 103.

  When manufacturing the moving lamp member 67 described above, one end surface 96A of the disk portion 96 is formed with a plurality of lamp grooves 97 and recessed around the lamp grooves 97 toward the edges 97d to 97f of the lamp groove 97. The step of forming the hollow portion 306 occurs. In this step, the hollow portion 306 of the one end surface 96 </ b> A is formed by forging together with the ramp groove 97.

  As shown in FIG. 2, the moving ramp member 67 is configured such that the ball 66 is disposed in the ramp groove 97 in a state where the ball 66 is disposed in the ramp groove 75 of the fixed ramp member 65, and the shaft portion 95 is fixed to the fixed ramp member 67. The shaft portion 95 is further inserted into the central through hole 26 of the cylinder bottom portion 16 so as to protrude outward from the cylinder bottom portion 16. Here, in the central through hole 26 of the cylinder bottom portion 16, a collar 108 having a flange portion 107 formed at one end on the main hole portion 29 side of the main hole portion 29 and the large diameter hole portion 30 causes the flange portion 107 to have a large diameter. The O-ring 109 is fitted to the bore 22 side from the flange portion 107 of the large-diameter hole 30. The moving ramp member 67 is inserted inside the O-ring 109 and the collar 108 at the insertion portion 101 of the shaft portion 95, and the O-ring 109 seals the gap between the moving ramp member 67 and the cylinder 18.

  The engaging groove 102, the serration and the male screw 104 of the shaft portion 95 of the moving ramp member 67 protrudes outward from the cylinder 18. A shaft cover 111 is disposed inside the cylindrical portion 31 of the cylinder 18, and a plate-like operating member 112 is attached in the direction perpendicular to the axis so as to fit the serration 103 of the shaft portion 95 of the moving ramp member 67. The nut 113 is screwed onto the male screw 104 of the shaft portion 95. The operating member 112 is non-rotatably fitted to the shaft portion 95 of the moving ramp member 67 by the serration 103. When the nut 113 is fastened to the shaft portion 95, the operating member 112 is fixed integrally to the moving ramp member 67. The Here, the shaft cover 111 extends in a tapered shape from a cylindrical base portion 115 fitted to the cylindrical portion 31 of the cylinder 18 and an inner peripheral side of one end of the base portion 115 in the axial direction. An inner cover portion 116 that fits into the fitting groove 102 and an outer cover portion 117 that extends from the outer peripheral side of the one end of the base portion 115 in a front-opening shape and abuts against the cylinder 18 side surface of the operating member 112. Yes.

  As described above, the operating member 112 is integrally coupled to the moving ramp member 67 outside the cylinder 18, and an operation member including a parking brake lever or a parking brake pedal provided in the cab is operated. When the operating member 112 receives a rotation input via a cable (not shown), the moving ramp member 67 coupled to the operating member 112 rotates in accordance with the rotation of the operating member 112. . That is, the ball-and-ramp mechanism 62 holds the ball 66 between the recess 75a of the lamp groove 75 of the fixed lamp member 65 and the recess 97a of the lamp groove 97 of the moving lamp member 67 in an inoperative state. From this state, the ball 66 moves along the ramp groove 75 of the fixed ramp member 65 from the concave portion 75a to the inclined portion 75b and further to the end raised portion 75c in accordance with the rotation of the movable ramp member 67. The ramp groove 97 is moved from the concave portion 97a to the inclined portion 97b and further to the end raised portion 97c, and thereby the movable ramp member 67 is directly moved in the axial direction. That is, the ball and ramp mechanism 62 converts the rotational motion of the operating member 112 into the linear motion of the moving ramp member 67. Note that the axial hole 78 of the fixed lamp member 65 has a disk part 96 of the moving lamp member 67 and a disk part 71 of the fixed lamp member 65 located closest to the cylinder bottom 16 side from the opening side of the fixed lamp member 65. It extends to the vicinity of the gap. More specifically, the axial hole 78 of the fixed ramp member 65 is formed on the surface on the cylinder bottom 16 side of the disc portion 96 of the moving ramp member 67 located closest to the cylinder bottom 16 from the opening side of the fixed ramp member 65. Extends to position.

  The parking brake mechanism 61 includes a sliding disc 121 disposed on the opposite side of the shaft portion 95 of the disc portion 96 of the moving ramp member 67 of the ball and ramp mechanism 62 in the cylinder 18 and the sliding disc 121. A push rod that abuts on the disc portion 96 via the sliding disc 121 so as to be clamped by the disc portion 96, and moves in the axial direction of the cylinder 18 by receiving the direct acting pressing force of the moving ramp member 67. 122. That is, the push rod 122 is disposed in the cylinder 18 and moves in the same direction by the linear motion of the ball and ramp mechanism 62. A through hole 120 is formed at the center of the sliding disk 121.

  The push rod 122 has substantially the same diameter as the end surface opposite to the shaft portion 95 of the disc portion 96 of the moving ramp member 67, and receives the direct-acting pressing force of the moving ramp member 67 via the sliding disc 121. It has a disk-shaped flange portion 123 and a screw shaft portion (screw portion) 124 that protrudes in the shape of a shaft from the center of the flange portion 123 to the side opposite to the moving ramp member 67. As shown in FIG. 7, the flange portion 123 has a plurality of protrusions 125 having a constant width in the circumferential direction projecting radially outward (that is, in the outer diameter direction) from the outer peripheral portion at equal positions in the circumferential direction ( Specifically, three places are formed. As shown in FIG. 2, the protrusion 125 is an inclined portion that is inclined so as to be positioned on the opposite side of the screw shaft portion 124 toward the radially outer side along the chamfered portion 98 of the disk portion 96 of the moving ramp member 67. 126 and a slide portion 127 protruding outward from the tip of the inclined portion 126 along the radial direction. Further, the push rod 122 is formed with a positioning convex portion 128 that protrudes opposite to the screw shaft portion 124 at the center of the flange portion 123. When the sliding disk 121 is sandwiched between the positioning convex part 128 and the moving ramp member 67, the positioning convex part 128 is fitted into the through hole 120 of the sliding disk 121 and enters the escape concave part 99 of the moving ramp member 67. Is held in the center. In the push rod 122, the inclined portions 126 of the plurality of protrusions 125 are along the chamfered portion 98 of the moving ramp member 67, so that the flange portion 123 side can be kept coaxial with the moving ramp member 67. Yes.

  Since the push rod 122 receives the direct-acting pressing force of the moving ramp member 67, the screw shaft portion 124 transmits the direct-acting pressing force of the moving ramp member 67 and outputs the direct acting. The push rod 122 is fitted with a plurality of protrusions 125 slidably in a one-to-one manner in the plurality of axial holes 78 of the fixed ramp member 65 at the slide part 127 at the tip. As a result, the push rod 122 is in a state in which the rotation around the axis is restricted with respect to the fixed ramp member 65, and is movable in the axial direction by sliding the slide portion 127 through the axial hole 78 (that is, separated). And proximity is possible). Here, a plurality of protrusions 125 of the push rod 122 and a plurality of axial holes 78 of the fixed ramp member 65 are provided between the fixed ramp member 65 and the push rod 122, and in the rotational direction of the moving ramp member 67. A rotation stop mechanism 130 that allows linear movement of the push rod 122 while restricting relative rotation between the fixed ramp member 65 and the push rod 122 is configured. In other words, the plurality of axial holes 78 of the fixed ramp member 65 guide the push rod 122 so that it can linearly move while restricting the relative rotation of the push rod 122.

  The parking brake mechanism 61 has a substantially cylindrical clutch member 132 that is disposed in the cylinder 18 and is screwed to the screw shaft portion 124 of the push rod 122 with a female screw 131 formed on the inner diameter side.

  Here, the inner diameter side of the piston 47 is a small diameter inner diameter portion 135 having a small diameter on the lid portion 46 side, and an intermediate inner diameter portion 136 having a larger diameter than the small diameter inner diameter portion 135 on the opening side. The opening side of the portion 136 is a large-diameter inner diameter portion 137 having a larger diameter. Between the small-diameter inner diameter portion 135 and the intermediate inner-diameter portion 136, in order from the small-diameter inner-diameter portion 135 side, a tapered surface portion 139 is formed so as to be continuous with the small-diameter inner-diameter portion 135 so that the intermediate inner-diameter portion 136 side has a larger diameter. A stepped portion 140 having an annular step shape with a larger diameter than the large-diameter side of 139, and a tapered surface portion 141 that is continuous with the stepped portion 140 so as to have a larger diameter on the intermediate inner diameter portion 136 side and continues to the intermediate inner diameter portion 136. Are formed coaxially with the small-diameter inner diameter portion 135 and the intermediate inner diameter portion 136.

  In addition, a communication groove 142 that passes through the intermediate inner diameter portion 136 and the tapered surface portion 141 is formed along the axial direction on the inner diameter side of the piston 47 so as to connect the large diameter inner diameter portion 137 and the stepped portion 140. An annular locking groove 143 is formed in the intermediate inner diameter portion 136, and the above-described through hole 51 is formed on the lid portion 46 side of the small diameter inner diameter portion 135.

  The front end side of the clutch member 132 is a fitting portion 147 that fits into the small-diameter inner diameter portion 135 of the piston 47, and a flange portion 148 that is adjacent to the fitting portion 147 and extends in the radial direction is formed. . A tapered portion 149 that contacts the tapered surface portion 141 of the piston 47 is formed coaxially on the fitting portion 147 side of the flange portion 148. An annular seal groove 150 is formed in the fitting portion 147 of the clutch member 132. A ring-shaped clutch member seal 151 is held in the seal groove 150. The clutch member seal 151 seals a gap between the fitting portion 147 of the clutch member 132 and the small diameter inner diameter portion 135 of the piston 47. In the clutch member 132, the end on the fitting portion 147 side of the inner peripheral portion where the female screw 131 is formed is closed with a lid 152.

  Here, when the moving ramp member 67 of the ball and ramp mechanism 62 is rotated to move the moving ramp member 67 to the push rod 122 side, the push rod 122 is pressed by the moving ramp member 67 and the axial direction of the push rod 122 is increased. The clutch member 132 is linearly moved in the axial direction by being pressed by the push rod 122, and the clutch member 132 is brought into contact with the tapered surface portion 141 of the piston 47 at the tapered portion 149 so that the piston 47 is moved to the cylinder. 18 is forcibly slid toward the pad 13 side. That is, the clutch member 132 transmits the direct-acting pressing force of the moving ramp member 67 to the piston 47.

  The screw shaft portion 124 of the push rod 122 and the female screw 131 of the clutch member 132 have a clearance that can move in the axial direction by a predetermined amount without rotating between the push rod 122 and the clutch member 132. .

  Further, the above-described hole 51 on the lid portion 46 side of the piston 47 is for opening the gap between the piston 47 and the clutch member 132 to the atmosphere.

  The parking brake mechanism 61 has an adjusting portion 155 that adjusts the position of the clutch member 132 and the push rod 122 in the cylinder 18. The adjusting portion 155 is supported between the piston 47 and the flange portion 148 of the clutch member 132 by a retaining ring 156 that is locked in a locking groove 143 formed in the intermediate inner diameter portion 136 of the piston 47. When the piston 47 moves in the axial direction by the brake fluid pressure introduced into the cylinder 18, the piston 47 is caused to follow the piston 47 while rotating the clutch member 132 with respect to the push rod 122 which is substantially stopped. Move in the axial direction. Further, the adjustment portion 155 does not rotate the clutch member 132 relative to the push rod 122 when the push rod 122 linearly moves in the axial direction. As a result, the screw shaft portion 124 and the female screw 131 cause the clutch member 132 to rotate. 132 is moved linearly together with the push rod 122.

  The parking brake mechanism 61 is interposed between the cover member 160 provided so as to cover a part of the push rod 122, the flange portion 123 of the push rod 122, and the piston 47 side of the cover member 160. Is engaged with a push rod urging spring (push rod urging member) 161 that urges the ball and lamp toward the ball and ramp mechanism 62 and the ring groove 36 of the cylinder 18 to lock the cover member 160 to the cylinder 18. And a retaining ring 162 for restricting movement in the direction of the cylinder opening 17. The cover member 160, the push rod biasing spring 161, and the retaining ring 162 are also disposed in the cylinder 18. In other words, the cover member 160 holds the push rod biasing spring 161 with the push rod 122.

  The cover member 160 has a ring-shaped bottom portion 165 into which the clutch member 132 is inserted, and a side wall portion 166 extending from the outer peripheral edge of the ring-shaped bottom portion 165 to one side in the axial direction as shown in FIG. It has a cup shape. The side wall portion 166 is a cylindrical base portion 170 in which a portion connected to the ring-shaped bottom portion 165 has a cylindrical shape with a certain length in the axial direction. Further, the side wall 166 has a long extending portion 171 that extends from the cylindrical base portion 170 along the axial direction to the opposite side of the ring-shaped bottom portion 165 with a constant width narrow in the circumferential direction. A plurality of (specifically, three) positions are formed, and a short length that is shorter than the long extension portion 171 and that extends to the opposite side of the ring-shaped bottom portion 165 along the axial direction with a constant width that is wider in the circumferential direction. A plurality (specifically, three) of extending portions 172 are formed at equal positions in the circumferential direction.

  Here, the cover member 160 has a short extending portion 172 formed on one side of the long extending portion 171 adjacent in the circumferential direction, and as a result, on both sides in the circumferential direction of the short extending portion 172. As shown in FIG. 8 (b), on the one hand, a narrow groove 173 having a constant width narrow in the circumferential direction and extending along the axial direction opposite to the cylindrical base 170 is formed on the other side. A wide groove 174 having a constant width wider than the groove 173 and extending in the axial direction opposite to the cylindrical base 170 is formed. A plurality (specifically, three locations) of narrow-cut grooves 173 are also formed at equal positions in the circumferential direction, and a plurality (specifically, three positions) of wide-cut grooves 174 are also formed at equal positions in the circumferential direction. ing.

  The end of the long extension portion 171 opposite to the ring-shaped bottom portion 165 is bent radially outward to form a long position locking portion (first locking portion) 175, and the ring of the short extension portion 172 The end opposite to the bottom 165 is also bent outward in the radial direction to form a short position locking part (second locking part) 176. Both the long position locking portion 175 and the short position locking portion 176 that are formed to be shifted from each other in the circumferential direction are parallel to the ring-shaped bottom portion 165. As described above, since the extension length of the long extension portion 171 is longer than the extension length of the short extension portion 172, the long position locking portion 175 of the long extension portion 171 has a length from the ring-shaped bottom portion 165. The distance is longer than the distance from the ring-shaped bottom part 165 of the short position locking part 176 of the short extension part 172. In other words, the short position locking portion 176 is formed on the ring-shaped bottom 165 side of the cover member 160 relative to the long position locking portion 175. In other words, the long position locking portion 175 of the long extension portion 171 and the short position locking portion 176 of the short extension portion 172 are arranged on the outer periphery of the opening opposite to the ring-shaped bottom portion 165 in the cover member 160, respectively. A plurality of locations are alternately formed at intervals in the direction.

  As shown in FIG. 2, the cover member 160 is locked to the cylinder bottom 16 side of the retaining ring 162 held in the ring groove 36 of the cylinder tube portion 15 in the short position locking portion 176, and as a result, Movement in the direction of the cylinder opening 17 is restricted. Further, the cover member 160 is configured such that the long position locking portion 175 of the long extending portion 171 can be inserted and locked into the hook-shaped hole 79 of the fixed ramp member 65. Specifically, as shown in FIG. 4C, the long position locking portion 175 of the long extension portion 171 is disposed in the radial hole 82 of the flanged hole 79 of the fixed ramp member 65, and the side wall portion 72. The locking projection 91 and the standing wall 89 are locked to the locking extension wall 90. The flange-shaped hole 79 has a height of the wide portion 86 larger than the thickness of the long position locking portion 175 of the cover member 160, and as a result, the long position locking portion 175 of the cover member 160 is moved from the locked state to the long position. The locking portion 175 is formed to be movable in the direction of the disc portion 71 of the fixed ramp member 65.

  The ball and ramp mechanism 62, the sliding disk 121, the push rod 122, the push rod biasing spring 161, and the cover member 160 shown in FIG. 2 are assembled in advance into a cartridge and assembled into the caliper member 21. become.

  That is, first, as shown in FIG. 9A, the fixed lamp member 65 is disposed with the disc portion 71 on the lower side so that the one end surface 71A on the side wall portion 72 side of the disc portion 71 faces upward. As shown in FIG. 9B, a step of putting a ball 66 into the lamp groove 75 of the disk portion 71 of the fixed lamp member 65 from above the one end surface 71A and bringing it into contact with the lamp groove 75 is performed. At this time, the lamp groove is aligned with the axial hole 81 in the circumferential direction through the axial hole 81 of the bowl-shaped hole 79 formed in the side wall 72 of the fixed ramp member 65 from the side. Thus, the height difference with the ramp groove 75 at the time of charging is shortened to suppress jumping and the like. Further, at this time, on one end surface 71A other than the lamp groove 75, as shown in FIG. 4A, a recess 301 is formed around the lamp groove 75 and is recessed toward the edges 75d to 75f of the lamp groove 75. Therefore, even if the ball 66 is thrown into a position slightly deviated from the ramp groove 75, the ball 66 enters the ramp groove 75 due to the inclination of the recessed portion 301. Then, the ball 66 that has entered the ramp groove 75 is finally placed in the recess 75a by its own weight and stops.

  Next, as shown in FIG. 9C, from the upper side, the moving ramp member 67 is inserted into the inside of the side wall portion 72 of the fixed ramp member 65 with the shaft portion 95 positioned downward, and the shaft portion 95 is inserted into the fixed ramp member. A process of mounting the disc portion 96 on the ball 66 by inserting the through hole 73 of the 65 is performed. At this time, the moving ramp member 67 is rotated as necessary so that the ball 66 is brought into contact with the ramp groove 97 of the moving ramp member 67 without shifting from the recess 75a of the ramp groove 75 of the fixed ramp member 65. The disk part 96 of the member 67 is arranged to face the disk part 71 of the fixed lamp member 65. Further, at this time, the end 96A other than the lamp groove 97 of the disc portion 96 has a recess that is recessed toward the edges 97d to 97f of the lamp groove 97 around the lamp groove 97 as shown in FIG. Since the portion 306 is formed, even if the ball 66 abuts at a position slightly deviated from the ramp groove 97, the moving ramp member 67 rotates in the direction in which the ball 66 enters the ramp groove 97 due to the depression of the depression 306. Finally, the ball 66 is received in the concave portion 97a of the ramp groove 97, and the rotation of the moving ramp member 67 is stopped so as to have a moderation feeling.

  Next, as shown in FIG. 10A, after the sliding disk 121 is laid on the disk part 96 of the moving ramp member 67 so that the position of the through hole 120 is aligned with the escape recess 99, the push rod 122 is mounted. The sliding part 127 of the projection 125 is inserted into the axial hole 78 of the fixed ramp member 65 with the flange 123 side facing down, and the positioning convex part 128 is inserted into the through hole 120 and the escape concave part 99 while sliding. Mounted on the plate 121.

  Next, as shown in FIG. 10B, the push rod biasing spring 161 is mounted on the flange portion 123 of the push rod 122 so that the screw shaft portion 124 of the push rod 122 is inserted inside.

  Next, as shown in FIG. 10 (c), the cover member 160 has the long-position locking portion 175 and the short-position locking portion 176 on the lower side, and the screw shaft portion of the push rod 122 inside the side wall portion 166. 124 and the push rod urging spring 161 are inserted, and the screw shaft portion 124 of the push rod 122 is inserted so as to be inserted inside the ring-shaped bottom portion 165.

  As described above, the ball 66, the moving ramp member 67, the sliding disc 121, the push rod 122, the push rod biasing spring 161, and the cover member 160 are assembled in this order to the fixed ramp member 65, as shown in FIG. The phase of the long extending portion 171 is matched with the narrow portion 85 of the flange-shaped hole 79 of the fixed ramp member 65 shown in FIG. 4C, and the cover member 160 is pressed toward the fixed ramp member 65, and FIG. 8), the long position locking portion 175 of the long extension portion 171 shown in FIG. 8 is inserted into the narrow portion 85 shown in FIG. When the stop portion 175 is positioned below the locking protrusion 91, the cover member 160 is rotated relative to the fixed ramp member 65, and the long position locking portion 175 is locked and extended within the wide portion 86. Exit wall And it is positioned vertically lower side of the 90, to release the pressing.

  Then, as shown in FIGS. 4C and 10C, the cover member 160 abuts the long-position locking portion 175 against the locking extension wall portion 90 by the biasing force of the push rod biasing spring 161. Let As a result, the urging force of the push rod urging spring 161 maintains the state in which the long position locking portion 175 of the long extension portion 171 of the cover member 160 is in contact with the locking extension wall portion 90 of the fixed ramp member 65. As a result, it is locked in the bowl-shaped hole 79 of the fixed lamp member 65. In addition, as shown in FIG. 4C, the long-position locking portion 175 is restricted from rotating by the locking protrusion 91 and the standing wall portion 89 of the fixed ramp member 65, so that the cover member 160 is fixed. The lamp member 65 is attached. In this state, the phase of the short position locking portion 176 of the short extension portion 172 matches the narrow width portion 85 of the fixed ramp member 65, and the short position locking portion 176 of the short extension portion 172 is the narrow width portion. 85 can be inserted. Note that the phase of the short position locking portion 176 of the short extension portion 172 is adjusted in a state where the phase of the long position locking portion 175 of the long extension portion 171 is aligned with the narrow width portion 85 so that the above attachment is possible. Is fitted to the standing wall portion 88 having a low height, and the height of the standing wall portion 88 is longer than the locking projection 91 by inserting the long position locking portion 175 of the long extension portion 171 into the narrow width portion 85. Also, the height is such that the short position locking portion 176 of the short extension portion 172 is brought into contact with it after being positioned on the lower side.

  Through the above-described actuator assembly process, the ball and ramp mechanism 62, the sliding disk 121, the push rod 122, the push rod biasing spring 161 and the cover member 160 are covered with the bowl-shaped hole 79 in the side wall 72 of the fixed ramp member 65. The long position locking portion 175 of 160 is inserted and locked to be preassembled into a cartridge. Thus, the actuator assembly (disc brake actuator) shown in FIGS. 10 (c) and 3 is composed of the ball and ramp mechanism 62, the sliding disk 121, the push rod 122, the push rod biasing spring 161 and the cover member 160. ) 180 is assembled.

  Next, an insertion step of inserting the actuator assembly 180 formed as an assembly in the actuator assembly step into the cylinder 18 of the caliper member 21 is performed. In this insertion step, the caliper member 21 shown in FIG. 2 is arranged with the cylinder bottom 16 facing downward, the locking pin 28 is fitted into the pin hole 27, and the collar 108 and the O-ring 109 are arranged in the central through hole 26. To do. Then, the actuator assembly 180 is inserted into the cylinder 18 of the caliper member 21 from the cylinder opening 17 with the shaft portion 95 side of the moving ramp member 67 at the head. At this time, the shaft portion 95 of the moving ramp member 67 is inserted inside the O-ring 109 and the collar 108 of the central through hole 26, and the rotation pin 28 is inserted into the through hole 74 of the fixed ramp member 65. As a result, the fixed ramp member 65 comes into contact with the cylinder bottom portion 16. As a result, the actuator assembly 180 is disposed in the cylinder 18. At this time, as shown in FIG. 11A, the short position locking portion 176 of the cover member 160 of the actuator assembly 180 is positioned substantially at the same position as the ring groove 36 of the cylinder tube portion 15.

  Next, a locking process for attaching the retaining ring 162 to the cylinder 18 is performed. That is, the retaining ring 162 is inserted from the cylinder opening 17 shown in FIG. 2, and the short position latching part 176 of the cover member 160 is pressed by the retaining ring 162 as shown in FIG. When the cover member 160 is pushed slightly toward the cylinder bottom 16 while the biasing spring 161 is contracted, the retaining ring 162 is fitted into the ring groove 36 and attached to the cylinder 18, and the cover member 160 is positioned at a short position. The stop 176 is locked. At this time, as shown in FIG. 4C, the short-position locking portion 176 is in phase with the narrow portion 85 of the fixed ramp member 65, and therefore enters the narrow portion 85. Interference with the fixed lamp member 65 is avoided, and the pushing-in of the cover member 160 is allowed. In this way, the actuator assembly 180 is prevented from being detached from the cylinder by the retaining ring 162.

  As shown in FIG. 11B, the short position locking portion 176 of the cover member 160 is locked to the retaining ring 162 by the above-described locking process of the retaining ring 162 to the cylinder 12. In this state, the long position locking portion 175 is moved away from the locking extension wall portion 90 of the fixed ramp member 65 in the direction opposite to the retaining ring 162 (in the direction of the disc portion 71 of the fixed ramp member 65). I will let you. That is, in the above-described locking step, the long position locking portion 175 of the cover member 160 is fixed to the fixed ramp member from the locked state of the hook-shaped hole 79 of the fixed ramp member 65 and the long position locking portion 175 of the cover member 160. In this step, the cover member 160 is locked to the caliper member 21 via the retaining ring 162 by releasing the locking state between the long position locking portion 175 and the hook-shaped hole 79. As shown in FIG. 2, the cover member 160 is pressed against the retaining ring 162 by the urging force of the push rod urging spring 161 in such a state that the cover member 160 is locked to the caliper member 21 with the retaining ring 162. At the same time, the push rod 122 is pressed against the moving ramp member 67 of the ball-and-ramp mechanism 62 via the sliding disk 121, the moving ramp member 67 is moved to the ball 66, the ball 66 is moved to the fixed ramp member 65, and the fixed ramp member 65 is moved. It will be pressed against the cylinder bottom 16 respectively.

  On the other hand, the clutch member 132 to which the clutch member seal 151 is attached is fitted to the piston 47, and the adjusting portion 155 is locked to the piston 47 by the retaining ring 156, so that the piston 47, the clutch member 132, and the adjusting portion 155 are engaged. Is another piston assembly 181.

  In the caliper member 21, the piston seal 48 inserted from the cylinder opening portion 17 is fitted into the seal groove 39 of the cylinder cylinder portion 15, and one side of the boot 50 is fitted to the boot groove 40 of the cylinder 18. The piston assembly 181 is fitted into the sliding hole 38 of the cylinder cylinder portion 15 with the opening side of the piston 47 as the head, and the screw 131 of the actuator assembly 180 is screwed to the female screw 131 of the clutch member 132. The shaft portion 124 is screwed. Accordingly, the piston assembly 181 is disposed in the cylinder 18. Then, the other side of the boot 50 is fitted into the boot groove 49 of the piston 47.

  Before and after this, the fitting groove of the moving ramp member 67 in which the shaft cover 111 is fitted inside the cylindrical portion 31 of the cylinder bottom portion 16 and the tip of the inner cover portion 116 projects from the cylinder bottom portion 16. 102. Then, after the operating member 112 is fitted into the serration 103 of the moving ramp member 67, the nut 113 is screwed into the male screw 104.

  The caliper 14 is assembled as described above.

  In the disc brake 10 having such a configuration, when a parking brake lever or a parking brake pedal (not shown) is operated, the operating member 112 is rotated and the moving ramp member 67 of the ball and ramp mechanism 62 is rotated. At the same time as moving from the recess 75a of the ramp groove 75 of the fixed ramp member 65 to the inclined portion 75b and further to the end raised portion 75c, the inclined portion 97b and further the end raised portion from the recessed portion 97a within the ramp groove 97 of the moving ramp member 67. As a result, the moving ramp member 67 is pushed by the ball 66 and moves linearly. Then, the moving ramp member 67 moves the push rod 122 through the axial hole 78 of the fixed ramp member 65 fixed to the cylinder 18 while moving the slide portion 127 of the projection 125 of the protrusion 125. Move in the direction of. Then, the clutch member 132 moves integrally with the push rod 122 to move the piston 47 in the direction of the disk 12 and mechanically press the pair of pads 13 against the disk 12.

  On the other hand, when the brake fluid pressure is introduced between the cylinder 18 and the piston 47 by a brake operation with a normal brake pedal, the fluid pressure acts on the piston 47 with respect to the pressure receiving area by the piston seal 48 and the direction of the disk 12 However, the hydraulic pressure also acts on the clutch member 132 with respect to the pressure receiving area by the clutch member seal 151 to generate a propulsive force in the direction of the disk 12. The piston 47 is pushed by moving in the axial direction without rotating by the screw clearance of the screw shaft portion 124 of the push rod 122.

  When the brake fluid pressure is further introduced into the cylinder 18 and becomes equal to or higher than the predetermined fluid pressure, the clutch member 132 is pressed against the piston 47 by the fluid pressure acting on the clutch member 132, and the fluid pressure is applied to the piston 47. As a result, a driving force in the direction of the disk 12 is generated, and a hydraulic pressure is also applied to the clutch member 132 to generate a driving force in the direction of the disk 12.

  Here, in the disc brake of Patent Document 1 described above, the rotational force is applied to the opposing surfaces that hold the balls of the fixed ramp member and the moving ramp member of the ball and ramp mechanism that propels the piston by changing the rotational force to the linear motion propulsive force. However, it is necessary to assemble a ball-and-ramp mechanism by placing balls in these narrow ramp grooves, and the manufacturing process is complicated.

  On the other hand, according to the disc brake 10 of the first embodiment, the one end surface 71A other than the ramp groove 75 of the fixed ramp member 65 is directed around the ramp groove 75 toward the edges 75d to 75f of the ramp groove 75. Therefore, even if the ball 66 is inserted at a position slightly deviated from the ramp groove 75, the ball 66 is naturally guided to the ramp groove 75 by its own weight due to the inclination of the depression 301. Will be. Therefore, manufacturing can be facilitated.

  In addition, a recess 306 that is recessed toward the edges 97d to 97f of the lamp groove 97 is formed around the lamp groove 97 on the one end surface 96A other than the lamp groove 97 of the moving lamp member 67. Even if the ball 66 comes into contact with a position slightly deviated from the groove 97, the rotation of the moving ramp member 67 can be guided in the direction in which the ball 66 is inserted into the ramp groove 97 due to the inclination of the recess 306. Therefore, manufacturing can be facilitated.

  Therefore, if at least one of the recessed portion 301 of the fixed lamp member 65 and the recessed portion 306 of the moving lamp member 67 is formed, the manufacturing can be facilitated, and preferably formed on both. Further, the manufacturing can be facilitated.

  Further, the recessed portion 301 of the one end surface 71A of the disk portion 71 of the fixed lamp member 65 is directed from the outer peripheral portion of the fixed lamp member 65 and the inner peripheral portion of the fixed lamp member 65 toward the edge portions 75d and 75e of the lamp groove 75. Even if the ball 66 is thrown out of the ramp groove 75 inward and outward in the radial direction with respect to the ramp groove 75, the ball 66 is placed in the ramp groove 75 by its own weight due to the inclination of the depression 301. Will be guided to. Therefore, manufacturing can be facilitated.

  Further, the recess 301 of the one end surface 71 </ b> A of the disk portion 71 of the fixed lamp member 65 is formed to be recessed from the thick top portion 300 between the plurality of lamp grooves 75 toward the edge of the lamp groove 75. Therefore, even if the ball 66 is thrown out of the ramp groove 75 toward the outer side in the circumferential direction of the disc portion 71, the ball 66 is naturally guided to the ramp groove 75 by its own weight due to the inclination of the recess portion 301. Become. Therefore, manufacturing can be facilitated.

  Further, the recess 301 of the one end surface 71A of the disk portion 71 of the fixed lamp member 65 is formed in a circular arc shape toward the edges 75d to 75f of the lamp groove 75, and the disk of the moving lamp member 67 is formed. Since the recessed portion 306 of the one end surface 96A of the portion 96 is formed in an arc shape toward the edge portions 97d to 97f of the ramp groove 97, the protrusion of the ball 66 from the recessed portion 301 and the recessed portion 306 is restricted. it can.

  Further, the recess 301 of the one end surface 71A of the disk portion 71 of the fixed lamp member 65 is formed to be recessed in the same direction as the recess direction of the lamp groove 75, and one end surface of the disk portion 96 of the moving lamp member 67. Since the recessed portion 306 of 96A is formed to be recessed in the same direction as the recessed direction of the ramp groove 97, the forming by forging the ramp groove 75 and the recessed portion 301 and the forming by forging the ramp groove 97 and the recessed portion 306 are performed. And it becomes easier. Therefore, the manufacturing can be further facilitated.

  Moreover, since the side wall part 72 which protrudes from 71 A of one end surfaces in the reverse direction to the recessed direction of the lamp groove 75 is formed in the outer periphery of the fixed lamp member 65, the lamp groove 75 and the side wall part 72 are shape | molded by forging. Can do. Therefore, the manufacturing can be further facilitated.

  Further, the fixed lamp member 65 is provided with a through hole 74 for preventing the caliper 14 from rotating, and the through hole 74 is disposed between the adjacent recess portions 301. The direction length can be secured. A through-hole 74 for preventing the fixed ramp member 65 from rotating relative to the caliper 14 may be disposed inside the recess 301 as shown in FIG. When configured in this manner, although the axial length of the through hole 74 is slightly shortened, it is possible to easily remove burrs generated during processing.

  Further, according to the disc brake manufacturing method of the first embodiment, the bottom portion where the ball 66 abuts against the one end surface 71A of the disc portion 71 of the fixed ramp member 65 of the ball and ramp mechanism 62 and is in contact with the ball 66 is inclined. Forming a plurality of lamp grooves 75 and a recess 301 that is recessed toward the edges 75 d to 75 f of the lamp groove 75 around the lamp groove 75, and a moving lamp member 67 of the ball-and-lamp mechanism 62. A plurality of ramp grooves 97 extending in the circumferential direction and inclined at a bottom portion thereof in contact with the ball 66, and edge portions 97 d to 97 f of the lamp groove 97 around the lamp groove 97. A step of forming the recessed portion 306 that is recessed toward the end, and one end surface 71A of one fixed lamp member 65 is disposed upward, and the ball 66 is inserted from above the one end surface 71A to contact the lamp groove 75. And the disc portion 96 of another moving ramp member 67 is opposed to the disc portion 71 of one fixed ramp member 65 so that the ball 66 contacts the ramp groove 97 of the other moving ramp member 67. Arranging. As a result, a recess 301 that is recessed toward the edges 75d to 75f of the lamp groove 75 is formed around the lamp groove 75 on the one end surface 71A of the fixed lamp member 65 other than the lamp groove 75. Even if the ball 66 is thrown into a position slightly deviated from the ramp groove 75, the ball 66 is naturally guided to the ramp groove 75 by its own weight due to the inclination of the recess 301. Therefore, manufacturing can be facilitated. In addition, a recess 306 that is recessed toward the edges 97d to 97f of the lamp groove 97 is formed around the lamp groove 97 on the one end surface 96A other than the lamp groove 97 of the moving lamp member 67. Even if the ball 66 comes into contact with a position slightly deviated from the groove 97, the rotation of the moving ramp member 67 can be guided in the direction in which the ball 66 is inserted into the ramp groove 97 due to the inclination of the recess 306. Therefore, manufacturing can be facilitated.

  Further, the recess 301 of the one end surface 71A of the disk portion 71 of the fixed ramp member 65 is formed by forging together with the lamp groove 75 of the fixed ramp member 65, and the recess of the one end surface 96A of the disk portion 96 of the moving ramp member 67 is formed. Since the part 306 is also formed by forging together with the ramp groove 97 of the moving ramp member 67, the manufacture can be further facilitated.

  Further, on the outer periphery of the fixed ramp member 65, the side wall portion 72 protruding from the one end surface 71A in the direction opposite to the recess direction of the ramp groove 75 is formed by forging together with the ramp groove 75 and the recess portion 301. Can be.

“Second Embodiment”
Next, a second embodiment will be described mainly based on FIG.

  FIGS. 13A and 13B show a fixed ramp member constituting the disc brake of the second embodiment. FIG. 13A is a plan view, FIG. 13B is a sectional view taken along line a2-a2, and FIG. It is b2-b2 sectional drawing of. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.

  In the second embodiment shown in FIG. 13, the shape of the recessed portion 301 of the fixed lamp member 65 is different from that of the first embodiment.

  Also in the second embodiment, the one end face 71A other than the lamp groove 75 of the disc portion 71 is located around the ramp groove 75 and outside the outer peripheral side edge portion 75d in the radial direction of the disc portion 71. An outer recess 301a formed by recessing from the outer periphery of the disc portion 71, which is the outer periphery of the member 65, toward the outer periphery side edge 75d, and the inner side of the inner periphery side edge 75e in the radial direction of the disc portion 71 An inner recess 301b formed by recessing from the inner periphery of the disk portion 71, which is the inner periphery of the fixed lamp member 65, toward the inner peripheral edge 75e, and the circumferential direction of the disk portion 71 And both end dents 301c formed on the outer sides of both end edge portions 75f and recessed toward the adjacent end edge portions 75f from the respective top portions 300 on both sides.

  And in 2nd Embodiment, as shown in FIG.13 (b), the cross section of the outer side hollow part 301a has a shape which inclines linearly toward the outer peripheral side edge part 75d, and connects with the outer peripheral side edge part 75d. The inner depression 301b has a cross section that is linearly inclined toward the inner peripheral edge 75e and is connected to the inner peripheral edge 75e. The cross section of one end depression 301c is shown in FIG. As shown in c), it forms a shape that is linearly inclined toward one end edge 75f on the adjacent side and is connected to the end edge 75f, and the cross section of the other end depression 301c is close to It has a shape that is linearly inclined toward the other end edge portion 75f and connected to the end edge portion 75f.

  According to such 2nd Embodiment, since the hollow part 301 of 71 A of one end surfaces is inclined and formed toward the edge parts 75d-75f of the ramp groove 75, the formation by forging becomes easy.

  In the second embodiment, the recessed portion 301 of the fixed ramp member 65 is formed so as to be inclined linearly toward the edge portions 75d to 75f of the ramp groove 75. However, the moving ramp member shown in FIG. Similarly, the 67 recessed portions 306 may be formed to be inclined linearly toward the edge portions 97 d to 97 f of the ramp groove 97.

“Third Embodiment”
Next, a third embodiment will be described mainly based on FIG.

  14A and 14B show a fixed ramp member constituting the disc brake of the third embodiment. FIG. 14A is a plan view, FIG. 14B is a sectional view taken along line a3-a3 in FIG. 14A, and FIG. It is b3-b3 sectional drawing. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.

  In 3rd Embodiment shown in FIG. 14, the shape of the hollow part 301 of the fixed lamp member 65 is different with respect to 1st Embodiment.

  Also in the third embodiment, the one end face 71A other than the lamp groove 75 of the disc portion 71 is located around the ramp groove 75 and outside the outer peripheral side edge portion 75d in the radial direction of the disc portion 71. An outer recess 301a formed by recessing from the outer periphery of the disc portion 71, which is the outer periphery of the member 65, toward the outer periphery side edge 75d, and the inner side of the inner periphery side edge 75e in the radial direction of the disc portion 71 An inner recess 301b formed by recessing from the inner periphery of the disk portion 71, which is the inner periphery of the fixed lamp member 65, toward the inner peripheral edge 75e, and the circumferential direction of the disk portion 71 And both end dents 301c formed on the outer sides of both end edge portions 75f and recessed toward the adjacent end edge portions 75f from the respective top portions 300 on both sides.

  And in 3rd Embodiment, as shown in FIG.14 (b), as for the cross section of the outer side hollow part 301a, the angle with respect to the axis-perpendicular direction of the disc part 71 is so small toward an outer side toward 75 d of outer peripheral sides. The linear portions 301a1 are combined to form a corrugated shape that is recessed and connected to the outer peripheral side edge portion 75d, and the inner recessed portion 301b has a cross section with respect to the axially orthogonal direction of the disc portion 71 toward the inner peripheral side edge portion 75e. A plurality of linear portions 301b1 having smaller angles toward the outer side are combined to form a corrugated shape that leads to the inner peripheral edge 75e, and a cross section of one end recessed portion 301c is as shown in FIG. 14 (c). A plurality of linear portions 301c1 having a larger angle with respect to the direction perpendicular to the axis of the disc portion 71 toward the one end edge portion 75f on the adjacent side are combined to form a shape that is recessed and connected to the end edge portion 75f. ,other The cross-section of the end recess portion 301c is recessed by combining a plurality of linear portions 301c1 whose angle with respect to the axis orthogonal direction of the disc portion 71 is larger toward the other end edge portion 75f on the adjacent side. It has a shape connected to the end edge 75f.

  According to such 3rd Embodiment, since the hollow part 301 of 71 A of one end surfaces makes a waveform shape and is hollowed and formed toward the edge parts 75d-75f of the ramp groove 75, formation by forging is easy. It becomes.

  In the third embodiment, the recessed portion 301 of the fixed ramp member 65 has a corrugated shape and is recessed toward the edges 75d to 75f of the ramp groove 75. However, the moving ramp member 67 shown in FIG. Similarly, the recessed portion 306 may have a corrugated shape and may be recessed toward the edge portions 97 d to 97 f of the lamp groove 97.

  In the above-described embodiment, a disk brake that operates the parking brake by rotating the moving ramp member 67 by the operation member 112 via the cable by the operation of an operation member such as a parking brake lever or a parking brake pedal is taken as an example. As described above, the parking brake mechanism 61 may be applied to a disk brake of an electric parking brake in which the operation of the parking brake mechanism 61 is performed by an electric motor.

  In the above embodiment, the lamp members 65 and 67 having the deepest central portions in the circumferential direction of the lamp grooves 75 and 97 have been described as an example. However, the lamps having the deepest end portions in the circumferential direction of the lamp grooves are described. You may make it provide the hollow parts 301 and 306 in a member.

10 Disc brake 12 Disc 13 Pad 14 Caliper 47 Piston 62 Ball and ramp mechanism 65 Fixed ramp member (ramp member)
66 ball 67 movable lamp member (lamp member)
71,96 disc part (plate-like part)
71A, 96A One end face 72 Side wall part (wall part)
74 Through hole 75, 97 Lamp groove 75d, 97d Outer peripheral edge (edge)
75e, 97e Inner peripheral edge (edge)
75f, 97f End edge (edge)
300,305 Top 301,306 Recess

Claims (12)

In a caliper having a piston that presses a pad against a disc, in a disc brake having a ball and ramp mechanism that propels the piston by changing the rotational force into a linear motion propulsion force,
The ball-and-lamp mechanism is provided with a pair of lamp members having a plate-like portion, and at least one lamp member extends in the circumferential direction on one end surface of the plate-like portion and has an inclined bottom where the ball contacts. Having a plurality of lamp grooves,
A disc brake characterized in that a recess portion that is recessed toward the edge of the ramp groove is formed around the ramp groove on the one end surface other than the ramp groove.   2. The disk according to claim 1, wherein the recessed portion of the one end surface is formed to be recessed from an outer peripheral portion of the lamp member and an inner peripheral portion of the lamp member toward an edge portion of the lamp groove. brake.   The one end surface is formed with a thick top portion between the plurality of lamp grooves, and the recess portion on the one end surface is formed to be recessed from the top portion toward the edge of the lamp groove. The disc brake according to claim 1 or 2, wherein   The disc brake according to any one of claims 1 to 3, wherein the recess portion on the one end surface is formed in an arc shape toward an edge portion of the ramp groove.   The disc brake according to any one of claims 1 to 3, wherein the recess portion on the one end surface is formed to be inclined toward an edge portion of the ramp groove.   The disc brake according to any one of claims 1 to 5, wherein the recessed portion on the one end surface is formed to be recessed in the same direction as the recessed direction of the ramp groove.   The wall part which protrudes from the said one end surface in the reverse direction to the recessed direction of the said lamp groove is formed in the outer periphery of the said one lamp member, The Claim 1 thru | or 6 characterized by the above-mentioned. Disc brake.   8. The lamp member is provided with a through hole for preventing the lamp member from rotating relative to the caliper, and the through hole is disposed inside the recess. Disc brake according to any one of the above.   8. The lamp member is provided with a through hole for preventing the lamp member from rotating relative to the caliper, and the through hole is disposed between the recesses. Disc brake according to any one of the above. In a caliper having a piston that presses a pad against a disc, in a manufacturing method of a disc brake having a ball-and-ramp mechanism for propelling the piston by changing a rotational force into a linear motion propulsion force,
A plurality of sloped bottom portions that extend in the circumferential direction and contact the ball on one end surface of the plate-like portion of at least one of the pair of lamp members having the plate-like portion of the ball-and-lamp mechanism. Forming a lamp groove and a recess that is recessed toward the edge of the lamp groove around the lamp groove;
Placing the one end surface of the one lamp member facing upward and inserting a ball from above the one end surface to contact the lamp groove;
Disposing the other lamp member facing the one lamp member such that the ball contacts the lamp groove of the other lamp member of the ball and ramp mechanism;
A method of manufacturing a disc brake, comprising:   The method for manufacturing a disc brake according to claim 10, wherein the recessed portion of the one end surface is formed by forging together with the ramp groove of the ramp member.   11. A wall portion protruding from the one end surface in a direction opposite to the recess direction of the lamp groove is formed on the outer periphery of the one lamp member by forging together with the lamp groove and the recess portion. Or the method for producing a disc brake according to 11 above.

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