JP5546491B2 - Electric parking brake device - Google Patents

Description

  The present invention relates to an electric parking brake device, and more particularly to an electric parking brake device in which a parking lever that frictionally engages a brake lining of a brake shoe with a brake drum is rotated by a motor.

  For example, Patent Document 1 describes the following electric parking brake device. In this electric parking brake device, a pressing device that presses the brake shoe to press the brake lining against the brake drum is provided in the vicinity of the anchor portion that supports one end of the brake shoe. This pressing device includes a motor, a worm, a worm wheel, a screw member, and a shoe pressing rod. The motor is fixed such that the main body of the motor projects toward the vehicle with respect to the back plate (backing plate), and the output shaft of the motor projects through the through hole formed in the back plate to the brake drum side. The worm is inserted into the output shaft of the motor. A screw member is integrally held via a key on the inner peripheral side of the worm wheel.

  A female screw is formed on the inner peripheral side of the screw member, and a male screw that can be screwed into the female screw of the screw member is formed on the outer peripheral side of the shoe pressing rod. The shoe pressing rod is held so as to be movable relative to the screw member in the axial direction. The end of the shoe pressing rod is sandwiched between the brake shoes, and rotation around the axis of the shoe pressing rod is prevented. The screw member is held so as to be rotatable relative to the housing via a bearing. In this electric parking brake device, the rotational motion of the motor is converted into a linear motion, the shoe pressing rod moves in the axial direction, and the brake shoe is pressed to frictionally engage the brake lining with the brake drum.

JP 2009-92092 A (paragraph numbers 0008, 0009, FIGS. 3 and 4)

  In the electric parking brake device described above, the motor body is fixed so as to protrude toward the vehicle with respect to the back plate. Therefore, the motor is exposed to the outside of the brake drum, which is not preferable from the viewpoint of waterproofness and dustproofness. In order to improve this point, the motor may be housed inside the brake drum. However, since it is necessary to avoid interference between the motor and the anchor part or the vehicle-side hub part, the motor storage space inside the brake drum is limited. And since the motor which demonstrates the output according to a vehicle weight enlarges, it may be unable to be accommodated in a brake drum. If the size of the brake drum itself is increased, the motor can be accommodated inside the brake drum, but there is a problem that the types of vehicles to which the brake drum can be attached are limited.

  The present invention has been made in view of the above circumstances, and the object thereof is excellent in mountability inside a brake drum of a drive unit such as a motor that rotates a parking lever, and the drive unit is waterproof and dustproof. The object is to provide a high electric parking brake device.

  In order to solve the above-described problem, the invention according to claim 1 is characterized in that the outer surface is fixed to the mounting portion on the vehicle body side, and is located on the inner surface side of the back plate and is rotatable about the rotation axis. A brake drum, a brake lining capable of frictional engagement with the brake drum, a pair of brake shoes rotatably supported on the back plate, and a pair of brake shoes fixed to the back plate, One end of the brake shoe is supported on one end of the brake shoe and the other brake shoe is rotatably supported, and a connecting member is interposed between the other brake shoe and rotates, thereby rotating the brake shoe. The pair of brake shoes are expanded to the brake drum side with one end portion supported by the anchor portion as a fulcrum, and the pair of brake linings are A parking lever that frictionally engages the drum, and a rotating member and an axially moving member that are fitted to each other via a conversion mechanism that converts rotational motion into linear motion are supported by the case, and the axially moving member is restricted in rotation and is An electric parking brake device comprising: a drive unit coupled to the other end of the parking lever; and a driving unit that pivots the parking member by rotating the rotating member by a motor. The anchor portion and the case are integrally formed so as to overlap in the rotation axis direction, and the case is fixed to the back plate.

  According to a second aspect of the present invention, in the first aspect, the inner surface of the back plate is provided with a concave portion that is recessed toward the outer surface side, and at least a part of the case is accommodated and fixed in the concave portion. It is that you are.

  According to a third aspect of the present invention, in the first or second aspect, the case is provided with a receiving portion that receives a part of the pair of brake shoes in the rotation axis direction.

  According to a fourth aspect of the present invention, in the case according to any one of the first to third aspects, the case has an end on the back plate side in the rotation axis direction fixed to the back plate, and the case is opposite to the rotation axis direction. The anchor portion is integrally formed at the back plate side end portion.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the case has a back-preventing portion that prevents the pair of brake shoes from moving away from the case by moving away from the back plate. It is protrudingly provided in the direction orthogonal to the said rotation axis from the plate side edge part side.

  According to the first aspect of the present invention, the anchor portion and the case are integrally formed so as to overlap in the rotation axis direction of the brake drum, and the case is fixed to the back plate. In the brake drum, the anchor part and the vehicle-side hub parts are arranged in a direction perpendicular to the rotation axis direction of the brake drum. Therefore, the arrangement space in the rotation axis direction of the brake drum is perpendicular to the rotation axis direction of the brake drum. There is a margin compared to the arrangement space in any direction. Accordingly, the anchor portion and the case can be disposed inside the brake drum by integrally forming the anchor portion and the case in the direction of the rotation axis of the brake drum. Therefore, the drive part excellent in the mountability to the inside of a brake drum can be comprised. Further, by fixing the case to the back plate, the drive unit is protected by the back plate. Therefore, the waterproofness and dustproofness of the drive unit can be improved.

  According to the second aspect of the present invention, the recess for accommodating and fixing at least a part of the case is formed by recessing the back plate toward the vehicle. Thereby, the arrangement space of a case can be expanded. Therefore, it is possible to mount various sizes of drive units that exhibit output in accordance with the vehicle weight inside the brake drum.

  According to the invention which concerns on Claim 3, the receiving part which receives a part of a pair of brake shoes in the rotating shaft direction of a brake drum, and supports a pair of brake shoes is provided in the case. Conventionally, the receiving portion was provided on the back plate in the vicinity of the anchor portion, but the anchor portion and the case are integrally formed by overlapping the rotation axis direction of the brake drum, and the case is fixed to the back plate. The receiving part cannot be provided on the back plate. Therefore, a receiving part can be provided in a case near an anchor part, and a pair of brake shoes can be supported firmly. The pair of brake shoes can be smoothly expanded in a direction perpendicular to the rotation axis of the brake drum.

  According to the fourth aspect of the invention, there is provided a case in which the end on the back plate side in the rotation axis direction is fixed to the back plate, and the anchor portion is integrally formed at the end on the opposite side of the back plate in the rotation axis direction. Yes. Thereby, it becomes easy to form the anchor portion and the case integrally in the direction of the rotation axis of the brake drum. Therefore, the assembly property of the electric parking brake device can be improved.

  According to the fifth aspect of the invention, the separation preventing portion that prevents the pair of brake shoes from moving away from the case by moving away from the back plate is provided on the side opposite to the back plate in the rotation axis direction of the case. It protrudes from the side in a direction perpendicular to the rotation axis of the brake drum. When the pair of brake shoes are expanded, the pair of brake shoes move away from the back plate, and one end of the brake shoe is easily detached from the end on the side opposite to the back plate in the rotation axis direction of the case. However, at that time, one end of the pair of brake shoes is locked to a separation preventing portion that protrudes in a direction perpendicular to the rotation axis of the brake drum from the side opposite the back plate side end in the rotation axis direction of the case. As a result, the pair of brake shoes can be reliably expanded without detaching from the end portion on the side opposite to the back plate in the rotation axis direction of the case.

It is the perspective view which looked at one embodiment of the electric parking brake device concerning the present invention from the brake drum side. It is the perspective view which looked at the electric parking brake device of FIG. 1 from the attachment part side of the vehicle body. It is the top view which looked at the electric parking brake apparatus of FIG. 1 from the rotating shaft direction of the brake drum. It is the sectional view on the AA line which looked at the electric parking brake device of Drawing 3 from the direction perpendicular to the axis of rotation of a brake drum. It is an expansion perspective view of the drive part vicinity of the electric parking brake apparatus of FIG. (A), (B) is the figure which looked at the connection state of the drive part of an electric parking brake device, and a parking lever from the rotation axis line direction of a brake drum, and the direction orthogonal to the rotation axis line. It is a BB sectional view showing the motor of the drive part of the electric parking brake device of Drawing 4, a rotation member, and an axial movement member. It is CC sectional view taken on the line which shows the case of the drive part of the electric parking brake apparatus of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 5, the electric parking brake device 1 includes a drum brake 10 including a parking brake mechanism and a drive unit 20 that drives the parking brake mechanism.

  As shown in FIG. 1, the drum brake 10 includes a pair of brake shoes 11a and 11b, a pair of brake linings 12a and 12b, a parking lever 13, a connecting member 14, a back plate 15, and a brake drum 16 (see FIG. 3) and the anchor portion 17 are schematically configured.

  The pair of brake shoes 11a and 11b are formed in an arc shape, and lining attaching portions 111a and 111b to which the pair of brake linings 12a and 12b are attached are respectively provided on the outer peripheral side. The pair of brake shoes 11a and 11b are arranged so that they can be expanded on both sides with respect to the center of the brake drum 16 and the pair of brake linings 12a and 12b can be contacted and separated from the inner periphery of the brake drum 16. While being rotatably supported on the inner surface 15 c of the plate 15, one end portions 112 a and 112 b are supported on an anchor portion 17 fixed to the inner surface 15 c of the back plate 15.

  The parking lever 13 is disposed along one side of the brake shoe 11a such that one side (a left side in FIG. 1 in this example) of the parking lever 13 is rotatably supported by a rotational support part 13a. And the connecting member 14 is inserted between the parking lever 13 and the other brake shoe 11b.

  As shown in FIG. 6, a through hole 13 aa that allows the parking lever 13 to tilt is formed in the rotation support portion 13 a of the parking lever 13. The other end side of the parking lever 13 is bent in a substantially inverted J shape that is substantially symmetrical with respect to the lever axis L2 of the parking lever 13 that is orthogonal to the rotation axis L1 of the rotation support portion 13a on the one end side. On the inner peripheral side of the bent portion 13b of the parking lever 13, opposed surfaces 13c and 13c that are substantially parallel to the lever axis L2 are formed. One end portion (left end side in FIG. 3) of a screw shaft member 27 described later passes through between the opposing surfaces 13c and 13c of the bent portion 13b.

  The back plate 15 is formed in a disk shape, and the outer surface is fixed to the mounting portion on the vehicle body side. That is, the back plate 15 is located on the back side of the drawing with respect to the back plate 15 of FIG. 1 by bolts (not shown) inserted through bolt holes 15b (four in the example of FIG. 1) in the center of the back plate 15 of FIG. It is fixed to a mounting portion (non-rotating body) on the vehicle body side (not shown). The brake drum 16 is disposed on the inner surface 15c side of the back plate 15 so as to be rotatable about the rotation axis R. Further, the inner surface 15c of the back plate 15 is recessed toward the outer surface 15d side so that at least a part of a case 24 of the driving unit 20 described later can be accommodated and fixed in a portion where the driving unit 20 is disposed. A recess 15a is provided. For example, as shown in FIG. 2, the recess 15 a may be formed by deep drawing processing in which the outer surface 15 d viewed from the mounting portion side of the vehicle body is convex, but is not limited thereto. For example, a case where only the inner surface 15c is recessed (the outer surface 15d does not become convex) is also included.

  The drive unit 20 is schematically configured by a motor 21, a rotation-linear motion conversion mechanism 22, a motion transmission member 23, and a case 24.

  As shown in FIG. 7, the portion of the motor 21 on the rotating shaft 21 a side is accommodated and fixed in the case 24. The rotation / linear motion conversion mechanism 22 includes a pinion 25, a nut member 26 (corresponding to the “rotating member” of the present invention), and a screw shaft member 27 (corresponding to the “axial moving member” of the present invention). Has been. The rotation-linear motion conversion mechanism 22 is a mechanism that converts the rotational movement of the nut member 26 around the axis to the linear movement of the screw shaft member 27 in the axial direction.

  The pinion 25 is a spur gear or a helical gear, is fixed to the rotating shaft 21 a of the motor 21, and is rotatably accommodated in the case 24. The nut member 26 is provided with a helical 26a that can be engaged with the pinion 25 on the outer periphery, and a screw hole 26b that can be screwed with the thread 27a of the screw shaft member 27 on the inner periphery. The screw shaft member 27 is provided with a screw thread 27a that can be screwed into the screw hole 26b of the nut member 26 on the outer periphery. The screw shaft member 27 is rotatably supported in the case 24 via a bearing (not shown), and the nut member 26 is rotatably supported in the case 24 by being screwed to the screw shaft member 27. .

  At one end portion (left end side in FIG. 7) of the screw shaft member 27, two chamfers 27b and 27b (see FIG. 6) having a width smaller than the width between the opposing surfaces 13c and 13c of the bent portion 13b of the parking lever 13 are formed. ing. The two chamfers 27b and 27b of the screw shaft member 27 are fitted between the opposing surfaces 13c and 13c of the bent portion 13b of the parking lever 13 in order to restrict the rotation of the screw shaft member 27 around the axis and allow the movement in the axial direction. It is.

  The motion transmission member 23 is formed in a substantially rectangular parallelepiped shape, that is, a so-called bowl shape, having one surface formed on a circumferential surface 23a having a convex shape. The movement transmitting member 23 is integrated with one end of the screw shaft member 27 so that the center axis L3 of the circumferential surface 23a is parallel to the rotation axis L1 of the rotation support portion 13a of the parking lever 13. Provided (see FIG. 6). The motion transmission member 23 is a member that transmits the motion transmission force due to the linear motion of the screw shaft member 27 in the axial direction to the parking lever 13, and the circumferential surface 23 a of the motion transmission member 23 is formed by the bent portion 13 b of the parking lever 13. It is in contact with the side surface 13d on the brake shoe 11a side.

  The case 24 and the anchor portion 17 are integrally formed so as to overlap in the direction of the rotation axis R of the brake drum 16. That is, as shown in FIG. 8, the case 24 has an end on the back plate 15 side in the direction of the rotation axis R fixed to the bottom surface of the recess 15 a of the back plate 15 via the rivet 28. And the anchor part 17 is integrally formed in the anti-backplate side edge part of the rotation axis R direction, ie, the edge part on the opposite side to the backplate 15 side.

  The case 24 receives parts 113a and 113b of the lining attachment portions 111a and 111b of the pair of brake shoes 11a and 11b in the direction of the rotation axis R of the brake drum 16 to support the pair of brake shoes 11a and 11b. The portions 24 a and 24 b are provided so as to protrude from the center side of the case 24 in a direction perpendicular to the rotation axis R of the brake drum 16.

  Further, the case 24 has a detachment preventing portion that prevents the pair of brake shoes 11a and 11b from moving away from the back plate 15 and detaching from the opposite end of the case 24 in the direction of the rotation axis R. 24c and 24d are provided so as to project in a direction perpendicular to the rotation axis R of the brake drum 16 from the side opposite to the back plate side end in the rotation axis R direction of the case 24.

  Next, the operation of the electric parking brake device 1 will be described. The electric parking brake device 1 is generally mounted on a rear wheel of a vehicle. The driver's seat of the vehicle is provided with a parking brake switch for operating both electric parking brake devices 1 and 1 respectively. When applying the parking brake, the passenger pushes the parking brake switch in the ON direction. Then, the motor 21 rotates, and this rotational motion is transmitted to the nut member 26 via the pinion 25. The transmitted rotational motion is converted by the screw shaft member 27 into a linear motion in the right direction in FIG. As a result, the parking lever 13 rotates counterclockwise in FIG.

  The parking lever 13 pushes the brake shoe 11a toward the brake drum 16 with the one end 112a supported on the anchor portion 17 of the case 24 as a fulcrum, and also pushes the brake shoe 11b into the case 24 via the connecting member 14. The one end portion 112b supported by the anchor portion 17 is pushed to the brake drum 16 side as a fulcrum. At this time, the portions 113a and 113b of the pair of brake shoes 11a and 11b are received and supported in the direction of the rotation axis R of the brake drum 16 by the receiving portions 24a and 24b, so the pair of brake shoes 11a and 11b are The brake drum 16 spreads smoothly in a direction perpendicular to the rotation axis R of the brake drum 16. Further, since the one end portions 112a and 112b of the pair of brake shoes 11a and 11b are locked to the separation preventing portions 24c and 24d, the case 24 does not come off from the end portion on the side opposite to the back plate in the rotation axis R direction. The pair of brake shoes 11 a and 11 b are surely expanded in a direction perpendicular to the rotation axis R of the brake drum 16.

  Then, the brake linings 12 a and 12 b are frictionally engaged with the inner periphery of the brake drum 16. Thus, the parking brake is applied. At this time, the motor 21 is stopped when a certain current or more flows through the motor 21. Thereby, a constant parking brake force can always be obtained. On the other hand, when releasing the parking brake, the passenger pushes the parking brake switch in the off direction. Then, the motor 21 rotates in the direction opposite to the previous direction, and the parking brake is released. At this time, the motor 21 is turned off when no-load current is reached. Thereby, useless energy consumption can be suppressed.

  According to the electric parking brake device 1 configured as described above, the following operational effects can be obtained. The anchor portion 17 and the case 24 are integrally formed so as to overlap in the direction of the rotation axis R of the brake drum 16, and the case 24 is fixed to the back plate 15. In the brake drum 16, the vehicle-side hub parts and the like are arranged in a direction perpendicular to the rotation axis R of the brake drum 16, so the arrangement space in the direction of the rotation axis R of the brake drum 16 is the same as the rotation axis R of the brake drum. There is a margin compared to the arrangement space in the direction at right angles. As a result, the anchor portion 17 and the case 24 can be integrally disposed so as to overlap in the direction of the rotation axis R of the brake drum 16. Therefore, the drive part 20 excellent in the mountability in the brake drum 16 can be comprised. Further, by fixing the case 24 to the back plate 15, the drive unit 20 is protected by the back plate 15. Therefore, the waterproofness and dustproofness of the drive unit 20 can be improved.

  Further, a recess 15a for accommodating and fixing at least a part of the case 24 is formed by recessing the back plate 15 toward the vehicle. Thereby, the arrangement space of case 24 can be expanded. Therefore, it is possible to mount various sizes of the drive unit 20 that exhibits an output corresponding to the vehicle weight inside the brake drum 16.

  Further, receiving portions 24 a and 24 b for receiving a part of the pair of brake shoes 11 a and 11 b in the direction of the rotation axis R of the brake drum 16 and supporting the pair of brake shoes 11 a and 11 b are provided in the case 24. Conventionally, the receiving portion is provided on the back plate in the vicinity of the anchor portion. However, the anchor portion 17 and the case 24 are integrally formed in the direction of the rotation axis R of the brake drum 16, and the case 24 is formed on the back plate 15. Since they are fixed, the receiving portions 24 a and 24 b cannot be provided on the back plate 15. Therefore, by providing the receiving portions 24a and 24b on the case 24, the receiving portions 24a and 24b can be provided in the vicinity of the anchor portion 17, and the pair of brake shoes 11a and 11b can be firmly supported. Then, the pair of brake shoes 11 a and 11 b can be smoothly expanded in a direction perpendicular to the rotation axis R of the brake drum 16.

  Further, an end portion on the back plate 15 side in the direction of the rotational axis R is fixed to the back plate 15, and a case 24 is integrally formed with an anchor portion 17 at the end on the opposite side of the back plate in the direction of the rotational axis R. Thereby, it becomes easy to form the anchor part 17 and the case 24 integrally in the direction of the rotation axis R of the brake drum 16. Therefore, the assembly property of the electric parking brake device 1 can be improved.

  Further, the separation preventing portions 24c and 24d that prevent the pair of brake shoes 11a and 11b from moving away from the back plate 15 and separating from the case 24 are provided on the side opposite to the back plate in the rotation axis R direction of the case 24. Projecting in a direction perpendicular to the rotation axis R of the brake drum 16 from the side of the end. When the pair of brake shoes 11a and 11b are expanded, the pair of brake shoes 11a and 11b are moved away from the back plate 15, and one end portions 112a and 112b of the brake shoes 11a and 11b are rotated about the rotation axis R of the case 24. Easily detached from the opposite end of the back plate. However, at this time, the one end portions 112 a and 112 b of the pair of brake shoes 11 a and 11 b protrude in a direction perpendicular to the rotation axis R of the brake drum 16 from the side opposite to the back plate side end in the rotation axis R direction of the case 24. Since it is locked to the provided disengagement prevention portions 24c and 24d, the pair of brake shoes 11a and 11b are surely expanded without detaching from the opposite end portion of the case 24 in the direction of the rotation axis R. Can do.

  Further, one surface of the motion transmitting member 23 that contacts the side surface 13d of the parking lever 13 on the brake shoe 11a side is formed on a circumferential surface 23a. Thereby, the shift | offset | difference of a movement when the parking lever 13 rotates centering on the rotation support part 13a by the linear motion of the screw shaft member 27 can be suppressed. Therefore, it is possible to prevent the motion transmission force by the motion transmission member 23 from becoming an unbalanced load, and the parking lever 13 can be smoothly rotated.

  Further, the screw shaft member 27 penetrates the other end of the parking lever 13 so as to be relatively movable in the axial direction with the relative rotation being restricted, and the motion transmission member 23 is integrally provided at the tip of the screw shaft member 27. It has been. That is, in the screw shaft member 27, the two chamfers 27b and 27b are fitted between the opposing surfaces 13c and 13c of the bent portion 13b of the parking lever 13, and the rotation of the screw shaft member 27 around the axis is restricted and the axial movement is prevented. Is allowed. The motion transmission member 23 is integrally provided at the tip of the screw shaft member 27. For this reason, the rotational motion of the nut member 26 can be reliably converted into the linear motion of the screw shaft member 27.

  In the above-described embodiment, the convex circumferential surface 23a is formed on the contact surface of the motion transmission member 23 with the side surface 13d of the parking lever 13, but the motion transmission member 23 on the side surface 13d of the parking lever 13 Even if a convex circumferential surface is formed on the contact surface, the same effect can be obtained. Further, a convex circumferential surface is formed on one of the contact surfaces of the motion transmitting member 23 and the side surface 13d of the parking lever 13, and a concave shape having the same diameter or a large diameter as the diameter of the convex circumferential surface. Even if the circumferential surface is formed, the same effect can be obtained. Further, the present invention is not limited to the circumferential surface, and the same effect can be obtained by forming a curved surface such as a spherical surface.

  Further, the rotation-linear motion conversion mechanism 22 is a mechanism that converts the rotational motion of the nut member 26 around the axis line into the linear motion of the screw shaft member 27 in the axial direction. It is good also as a mechanism converted into the linear motion of the nut member 26 in the direction of an axis. In the case of this mechanism, for example, the motion transmission member 23 is integrally provided at the tip of a member formed to protrude from the nut member 26 in the axial direction. Further, a rack and pinion mechanism may be used as the rotation-linear motion conversion mechanism 22.

  DESCRIPTION OF SYMBOLS 1 ... Electric parking brake device, 10 ... Drum brake, 11a, 11b ... Brake shoe, 12a, 12b ... Brake lining, 13 ... Parking lever, 14 ... Connecting member, 15 * ..Back plate, 15a ... concave, 16 ... brake drum, 17 ... anchor part, 20 ... drive part, 21 ... motor, 22 ... rotation-linear motion conversion mechanism, 23 ... motion transmission member, 24 ... case, 24a, 24b ... receiving part, 24c, 24d ... detachment preventing part, 26 ... nut member, 27 ... screw shaft member.

Claims (5)

A back plate (15) whose outer surface (15d) is fixed to the mounting portion on the vehicle body side;
A brake drum (16) which is disposed on the inner surface (15c) side of the back plate (15) and is rotatably arranged around the rotation axis (R);
A pair of brake shoes (11a, 11b) each having a brake lining (12a, 12b) capable of frictional engagement with the brake drum (16) and rotatably supported on the back plate (15);
An anchor (17) fixed to the back plate (15) and supporting one end of the pair of brake shoes (11a, 11b);
One of the brake shoes (11a) is rotatably supported at one end, and a connecting member (14) is inserted between the other brake shoe (11b), and the pair of brake shoes is rotated. (11a, 11b) is expanded to the brake drum (16) side with one end supported by the anchor portion (17) as a fulcrum, and the pair of brake linings are frictionally engaged with the brake drum (16). A parking lever (13);
A rotating member (26) and an axially moving member (27) that are fitted to each other are supported by a case (24) via a conversion mechanism (22) that converts rotational motion into linear motion, and the axially moving member (27) is The rotation is restricted and connected to the other end of the parking lever (13), and the rotating member (26) is rotationally driven by the motor (21), whereby the axially moving member (27) is axially moved to move the parking lever. An electric parking brake device (1) having a drive unit (20) for rotating (13);
The electric parking brake device in which the anchor portion (17) and the case (24) are integrally formed so as to overlap in the rotation axis (R) direction, and the case (24) is fixed to the back plate (15). In claim 1,
The inner surface of the back plate (15) is provided with a recess (15a) that is recessed toward the outer surface,
The electric parking brake device in which at least a part of the case (24) is housed and fixed in the recess (15a). In claim 1 or 2,
The electric parking brake device in which the case (24) is provided with receiving portions (24a, 24b) for receiving a part of the pair of brake shoes (11a, 11b) in the direction of the rotation axis (R). In any one of Claims 1 thru | or 3,
The case (24) has an end on the back plate (15) side in the direction of the rotation axis (R) fixed to the back plate (15), and an end on the side opposite to the back plate in the direction of the rotation axis (R). The electric parking brake device in which the anchor portion (17) is integrally formed. In claim 4,
In the case (24), the pair of brake shoes (11a, 11b) is prevented from moving away from the case (24) by moving in a direction away from the back plate (15). , 24d) protrudes in a direction perpendicular to the rotational axis (R) from the side opposite to the back plate side end.

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