JP5753108B2 - Disc brake device for vehicle - Google Patents

Description

  The present invention relates to a vehicle disc brake device, and more particularly to a vehicle disc brake device including a mechanical operating mechanism used for a parking brake.

  As a disc brake device used in four-wheeled vehicles, etc., it operates with a hydraulic operating mechanism that operates by the hydraulic pressure generated by operating the brake pedal, and a brake wire that is pulled by the operation of an operator such as a hand lever or foot pedal. There is a disc brake device with a parking brake provided with a mechanical operating mechanism. In this disc brake device with a parking brake, generally, a piston that constitutes a hydraulic operating mechanism is disposed on the end opening side of a cylinder hole provided in a caliper body, and an adjuster having an adjusting nut and an adjusting bolt on the rear surface side of the piston. And a mechanical actuating mechanism is disposed on the bottom side of the cylinder hole.

  As a mechanical operating mechanism, a rotating shaft of a cam that can move in the axial direction of the cylinder hole is arranged behind the adjuster, and the rotating shaft in the axial direction of the cylinder hole can be rotated on the bottom side of the cylinder hole of the caliper body. The rotating lever is fixed to the rotating shaft protruding from the caliper body, and the brake wire is assembled to the rotating lever. The rotating lever is provided with a positioning portion for positioning the rotating lever in an initial state when not operated, and a receiving portion for positioning the rotating lever in contact with the positioning portion on the bottom wall of the cylinder hole And a wire guide arm provided with a brake wire holding portion for holding the brake wire (see, for example, Patent Document 1).

JP 2009-36332 A

  The wire guide arm described in the above-mentioned patent document is configured such that the receiving portion and the brake wire holding portion are bent from a plate-like attachment portion attached to the bottom wall of the cylinder hole and protruded toward the rotating lever. However, the angle of the outer surface of the receiving portion in the bent and protruding state and the outer surface of the brake wire holding portion are different. For this reason, high precision is required for the production of the mold when the wire guide arm is press-molded. However, in the wire guide arm after molding due to angular tolerance or slight deviation in the positional relationship between the mold and the workpiece. There may be variations in the relationship between the receiving part and the brake wire holding part. If such a variation occurs, the parking performance may be reduced, so additional processing is required to ensure accuracy, a separate member for position adjustment is used, or delicate position adjustment is performed during installation. It will be necessary to do this, which will increase the manufacturing cost.

  Accordingly, an object of the present invention is to provide a vehicle disc brake device that can improve the accuracy of a positioning portion formed on a wire guide arm while reducing the number of man-hours for processing the wire guide arm.

In order to achieve the above object, a vehicle disc brake device according to the present invention is a machine in which a piston is inserted into a cylinder hole provided in a caliper body, and the piston is pushed toward the side of the disc rotor toward the bottom of the cylinder hole. An operation mechanism is arranged, one end of a rotation shaft for operating the mechanical operation mechanism is protruded from the caliper body, and a rotation lever for rotating the rotation shaft is fixed to the protruding end portion of the rotation shaft and,該回Do lever, and a connecting arm for connecting a positioning unit that female positioning the initial state of該回Do lever, a brake wire for rotating operating the pivot lever by pulling operation by an operator, Outside the bottom wall of the cylinder hole, a mounting portion that is attached to the outside of the bottom wall of the cylinder hole, a receiving portion that contacts the positioning portion and positions the rotating lever, and the brake wire In the vehicle disc brake device having a wire guide arm provided with a brake wire holding portion for holding the wire guide arm, the wire guide arm is formed by bending a plate material, bent from the attachment portion, and in the direction of the turning lever The outer surface of the receiving portion bent in the direction is formed in the normal direction of the rotating shaft, and the outer surface of the receiving portion and the outer surface of the brake wire holding portion are formed in parallel to each other. It is characterized by.

  According to the disk brake device for a vehicle of the present invention, since the receiving portion of the wire guide arm and the brake wire holding portion can be press-formed in parallel, the receiving portion and the brake wire holding portion are formed in a single step. Therefore, it can be formed with high accuracy, and the cost can be reduced. Further, since the positioning contact surface is formed with high accuracy, the contact position between the positioning contact surface and the positioning portion of the rotating lever is difficult to shift, and the initial position in the non-operating state of the rotating lever is not shifted. Since there is no possibility that it will occur, parking performance will not deteriorate.

  In addition, by forming the outer surface of the receiving part in the normal direction of the rotating shaft, variations in the contact position between the positioning part and the receiving part due to the dimensional tolerance of each part can be minimized, and the non-operating state The shift of the initial position of the rotating lever can be kept small, and it is possible to prevent the parking performance from deteriorating without increasing the dimensional accuracy of each component, thereby reducing the cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a vehicle disc brake device showing a first embodiment of the present invention. It is a principal part enlarged front view similarly. It is a principal part enlarged side view similarly. It is a perspective view of a wire guide arm similarly. It is a principal part expanded sectional view of the disk brake device for vehicles similarly. It is VV sectional drawing of FIG.

  FIG. 1 to FIG. 6 show an embodiment of the present invention, and the disc brake device 1 is a hydraulic operating mechanism that operates on the operating portion 2a of the caliper body 2 by the hydraulic pressure generated by operating the brake pedal. 3 and a mechanical actuating mechanism 4 that is actuated by a brake wire pulled by operation of an operation element such as a handlebar or a foot pedal. The hydraulic operating mechanism 3 is mainly used as a main brake during forward traveling of the vehicle in which the disc rotor 5 rotates in the direction of arrow A, and the mechanical operating mechanism 4 is used for vehicle parking where the disc rotor 5 has stopped rotating. Used as auxiliary brake for time.

  The caliper body 2 connects the action part 2 a disposed on one side of the disk rotor 5 and the reaction part 2 b disposed on the other side of the disk rotor 5 across the outside of the disk rotor 5. A bridge portion 2c, and is supported by a caliper bracket 6 fixed to the vehicle body at one side of the disc rotor 5 so as to be slidable in the disc axial direction via a pair of slide pins 7. The action portion 2a and the reaction portion A pair of friction pads 8, 8 are arranged between the disk rotor 5 and 2 b.

  Inside the action portion 2a, there are provided a cylinder hole 2d that opens to the disk rotor side, and a rotation shaft insertion hole 2f that communicates with the cylinder hole 2d and penetrates the bottom wall 2e of the cylinder hole 2d in the disk axial direction. A wire guide arm 9 is attached to the inner peripheral side of the disk on the outer surface of the cylinder hole bottom wall 2e. The cylinder hole 2d has a large-diameter portion 2g on the opening side of the tip and a small-diameter portion 2h on the bottom wall side of the cylinder hole. The large-diameter portion 2g has a bottomed cylindrical piston 10 and a small-diameter portion 2h. The thrust conversion mechanism 11 constituting the mechanical operation mechanism 4 is accommodated. Further, an adjuster 12 for automatically adjusting the braking gap between the disk rotor 5 and the friction pad 8 is disposed between the piston 10 and the thrust conversion mechanism 11, and the bottom wall 2e of the cylinder hole 2d is disposed on the bottom wall 2e. A fixed cam plate 13 is disposed.

  The adjuster 12 includes an adjusting bolt 12a and an adjusting nut 12b, and a small-diameter piston 12c and a clutch plate 12d are provided on the head of the adjusting bolt 12a. The adjustment nut 12b is internally formed with a multi-thread screw that is screwed with the adjustment bolt 12a, and a thrust transmission plate 12e is provided at the end on the cylinder hole bottom side. A cylindrical housing 15 that houses the cam spring 14 and the thrust transmission plate 12e is disposed on the outer peripheral side of the adjustment nut 12b.

  The piston 10 is accommodated in the large-diameter portion 2g of the cylinder hole 2d with the bottom facing the disk rotor side, and the adjusting nut 12b and the adjusting bolt 12a are provided on the inner central axis of the piston 10. A fitting hole 10a is provided on the inner surface of the bottom of the piston 10, and the small-diameter piston 12c is fitted into the fitting hole 10a via a sealing material, and the clutch plate 12d is opened from the opening of the fitting hole 10a. The conical surface 10b that expands is in pressure contact with the spring member 16.

  The thrust conversion mechanism 11 is rotatable with respect to the bottom wall 2e of the cylinder hole 2d and the fixed cam plate 13 and is movably penetrated in the cylinder axis direction. The drive side cam plate 17a provided on the cylinder hole opening side, the drive side cam plate 17a, and the plurality of ramp grooves 18 formed at positions opposed to the fixed side cam plate 13 and the ramp grooves 18 are respectively accommodated. And a cam bearing 19.

  The rotating shaft 17 has a small-diameter knurled portion 17b formed on the tip side of the protruding portion protruding from the bottom wall 2e of the cylinder hole 2d, and the rotating lever 19 is inserted into the knurled portion 17b. The rotating lever 19 is connected to the rotating shaft 17 by fastening the nut member 21 to the threaded portion protruding from the connecting member via the washer 20. The driving cam plate 17a has a cylindrical portion 17c protruding from the center of the cylinder hole opening side end, and the thrust transmission plate 12e is in contact with the side surface of the cylinder hole through a thrust bearing 22 and a spacer 23. .

  The mechanical operation mechanism 4 includes a piston 10, an adjuster 12, a thrust conversion mechanism 11, a turning lever 19, and a wire guide arm 9, and a connecting metal fitting 25 joined to the tip of the brake wire 24. Is connected to the rotation lever 19.

  The rotation lever 19 is formed by processing a plate material such as a steel plate into a predetermined shape. The rotation lever 19 is inserted into the knurled portion 17b of the rotation shaft 17 and connected to the rotation shaft 17, and the fixing portion 19a. A connecting arm 19b that protrudes from the portion 19a to one side and connects the brake wire 24; and a positioning portion 19c that protrudes from the fixing portion 19a to the other side to position the rotating lever 19 in an initial state. ing. The adhering portion 19a is formed in a substantially circular shape, and an insertion hole 19d through which the knurled portion 17b of the rotating shaft 17 is inserted is formed in the center portion. The connecting arm 19b is formed with a hook portion 19e for connecting the connecting metal fitting 25 of the brake wire 24 at the tip, and a planar restriction that restricts the rotation of the rotating lever 19 on the wire guide arm side of the connecting arm 19b. A surface 19f is formed. The positioning portion 19c is formed with an abutting portion 19g protruding in an arc shape at the protruding end portion.

  The wire guide arm 9 is formed by processing a plate material such as a steel plate into a predetermined shape. The wire guide arm 9 has a mounting portion 9a attached to the inner circumferential side of the cylinder hole bottom wall 2e by two bolt members 26, 26; A receiving portion 9b that protrudes from the mounting portion 9a to the anti-brake wire 24 side of the fixing portion 19a, a restricting portion 9c that protrudes from the mounting portion 9a to the brake wire 24 side of the fixing portion, and a receiving portion 9b from the mounting portion 9a. And the wire guide part 9d which protrudes in the opposite direction to the control part 9c is provided.

  The mounting portion 9a includes bolt holes 9e and 9e for screwing the bolt members 26 and 26, respectively. The receiving portion 9b rises from the mounting portion 9a at a substantially right angle, bends the tip portion toward the anti-cylinder hole bottom wall at a right angle, and comes into contact with the positioning contact surface 9f with which the positioning portion 19c contacts ( The outer surface is formed in the normal L1 direction of the rotating shaft 17, that is, in the normal direction of a circle centering on the axis of the rotating shaft 17. The restricting portion 9c rises from the mounting portion 9a in the direction of the brake wire, bends the tip at a right angle toward the anti-cylinder hole bottom wall, and the restricting surface 19f of the connecting arm 19b of the rotating lever 19 is contacted. The contact surface 9g for rotation control which contacts is formed. The wire guide portion 9d includes a bracket portion 9h that protrudes toward the inner peripheral side of the disc from the bottom wall 2e of the cylinder hole 2d, and a brake wire holding portion 9i that protrudes from the bracket portion 9h. The tip of the brake wire holding portion 9i The part is formed with a mounting recess 9k for mounting the wire holding member 27 for holding the brake wire 24, and a fixing hole 9m for a retaining member (not shown) for preventing the wire holding member 27 from coming off. The outer surface 9j of the brake wire holding portion 9i is formed as a surface parallel to the positioning contact surface 9f formed in the direction of the normal line L1 of the rotation shaft 17.

  The brake wire 24 has the connecting bracket 25 attached to the distal end, is held in the mounting recess 9k of the wire guide arm 9 via the wire holding member 27, and the base end side is connected to the handle lever and foot pedal near the driver's seat. Has been. A dustproof boot 28 is attached to the outer periphery of the brake wire 24 protruding from the wire holding member 27.

  In the disc brake device 1 formed as described above, in the brake operation using the hydraulic operation mechanism 3, the piston 10 is pushed in the direction of the disc rotor by the pressure of the working fluid introduced into the cylinder hole 2d, and the action The friction pad 8 of the part 2 a is pressed against one side of the disk rotor 5, and the caliper body 2 moves in the direction of the action part 2 a by the reaction force, and the reaction part 2 b pushes the friction pad 8 on the reaction part side of the disk rotor 5. A braking action is performed by pressing against the other side.

  At this time, if the braking gap between the friction pad 8 and the disk rotor 5 is within a predetermined range, the adjustment is performed only by the movement amount of the piston 10 moving the backlash between the adjustment bolt 12a and the adjustment nut 12b. Absent. When the braking gap with the disk rotor 5 exceeds a predetermined value due to wear of the friction pad 8, the piston 10 moves greatly to the disk rotor side beyond the backlash, and the adjustment bolt 12a rotates and moves forward, and the clutch plate 12d and the conical surface 10b of the piston 10 abut. When the brake operation is released in this state, the piston 10 and the adjustment bolt 12a move backward by the backlash. The braking gap between the friction pad 8 and the disk rotor 5 is automatically adjusted to a predetermined range.

  Further, in the barking brake operation by the mechanical operation mechanism 4, when the turning lever 19 is turned by the hand lever or the foot pedal, the driving cam plate 17a is turned together with the turning shaft 17, so that the driving cam The phase of the ramp grooves 18 of the plate 17a and the ramp grooves 18 of the fixed-side cam plate 13 in the non-rotating state shifts, so that the cam bearings 19 move to shallow portions of the ramp groove 18, respectively. The drive cam plate 17a moves away from the plate 13 and moves toward the disc rotor. The axial movement of the driving cam plate 17a is transmitted from the adjusting nut 12b to the piston 10 via the adjusting bolt 12a, and becomes a thrust force that pushes the piston 10 toward the disk rotor. The braking action is performed in the same manner as the braking action.

  As described above, when the barking brake operation is performed by the mechanical operation mechanism 4, the rotation lever 19 includes the contact portion 19 g of the positioning portion 19 c and the positioning contact surface 9 f of the receiving portion 9 b of the wire guide arm 9. And the initial state in the non-operating state is positioned. At this time, since the positioning contact surface 9f is formed in the direction of the normal line L1 of the rotating shaft 17, the contact portion 19g contacts the positioning contact surface 9f substantially at right angles, and the wire guide arm 9 or Even if the contact position between the contact portion 19g and the positioning contact surface 9f varies due to dimensional tolerances of the parts constituting the mechanical operation mechanism 4 such as the rotation lever 19 and the rotation shaft 17, etc. This variation can be suppressed as much as possible, and the deviation of the initial position of the rotation lever 19 can be suppressed to a minimum. Further, since the contact portion 19g of the positioning portion 19c protrudes in an arc shape, the displacement of the initial position of the rotating lever 19 due to variations in the contact position between the contact portion 19g and the positioning contact surface 9f is minimized. Can be small. Thereby, it can prevent that parking performance falls without raising the dimensional accuracy of each component which comprises the mechanical action | operation mechanism 4, and can achieve cost reduction.

  Further, the rotation amount of the rotation lever 19 is controlled by the contact between the restriction surface 19f of the connecting arm 19b of the rotation lever 19 and the contact surface 9g for rotation restriction of the restriction portion 9c of the wire guide arm 9. Therefore, the rotation lever 19 is prevented from rotating by a predetermined amount or more and the cam bearing 19 is prevented from being detached from the ramp groove 18, and the mechanical operation mechanism can be operated satisfactorily.

  Further, since the wire guide arm 9 projects the brake wire holding portion 9i from the attachment portion 9a in parallel with the positioning contact surface 9f, the wire guide arm 9 is formed into a predetermined shape by forming a plate material such as a steel plate. When processing, the brake wire holding portion 9i and the positioning contact surface 9f can be processed in parallel, the processing man-hour can be reduced, and the processing accuracy of the positioning contact surface 9f can be improved.

  The vehicle disc brake device according to the present invention is not limited to the above-described embodiments, and the internal structure of the cylinder hole is as long as the rotating shaft is rotated by a rotating lever connected to a brake wire. Is optional.

  DESCRIPTION OF SYMBOLS 1 ... Disc brake device, 2 ... Caliper body, 2a ... Action part, 2b ... Reaction part, 2c ... Bridge part, 2d ... Cylinder hole, 2e ... Bottom wall, 2f ... Rotating shaft insertion hole, 2g ... Large diameter part, 2h ... small diameter portion, 3 ... hydraulic actuation mechanism, 4 ... mechanical actuation mechanism, 5 ... disc rotor, 6 ... caliper bracket, 7 ... slide pin, 8 ... friction pad, 9 ... wire guide arm, 9a ... mounting portion, 9b: receiving portion, 9c: restricting portion, 9d: wire guide portion, 9e ... bolt hole, 9f ... contact surface for positioning, 9g ... contact surface for rotation restriction, 9h ... bracket portion, 9i ... brake wire holding portion , 9j ... outer surface, 9k ... mounting recess, 9m ... fixing hole, 9n ... receiving part, 9p ... rising part, 9q ... extension part, 9r ... projecting part, 9s ... contact surface for positioning, 10 ... piston, 10a ... Fitting hole, 10b ... conical surface, 11 Thrust converting mechanism, 12 ... adjuster, 12a ... adjusting bolt, 12b ... adjusting nut, 12c ... small diameter piston, 12d ... clutch plate, 12e ... thrust transmitting plate, 13 ... fixed cam plate, 14 ... cam spring, 15 ... housing, DESCRIPTION OF SYMBOLS 16 ... Spring member, 17 ... Rotating shaft, 17a ... Drive side cam board, 17b ... Knurled part, 17c ... Cylindrical part, 18 ... Ramp groove, 19 ... Rotating lever, 19a ... Adhering part, 19b ... Connecting arm, 19c ... Positioning part, 19d ... Insertion hole, 19e ... Hook part, 19f ... Restriction surface, 19g ... Abutting part, 20 ... Washer, 21 ... Nut member, 22 ... Thrust bearing, 23 ... Spacer, 24 ... Brake wire, 25 ... Connecting bracket, 26 ... bolt member, 27 ... wire holding member, 28 ... dustproof boot

Claims (1)

A piston is inserted into a cylinder hole provided in the caliper body, and a mechanical operating mechanism that pushes the piston toward the side surface of the disk rotor is disposed on the bottom side of the cylinder hole, and the mechanical operating mechanism is operated to rotate. One end of the shaft is protruded from the caliper body, and a rotating lever for rotating the rotating shaft is fixed to the protruding end portion of the rotating shaft, and the rotating lever positions the initial state of the rotating lever. and determined female that positioning portion, and a connecting arm for connecting the brake wire for rotating operating the pivot lever by pulling operation by an operator, to the outside of the bottom wall of the cylinder bore, the bottom wall of the cylinder bore A wire guide arm having an attachment portion attached to the outside, a receiving portion that contacts the positioning portion to position the rotating lever, and a brake wire holding portion that holds the brake wire; The vehicle disc brake system Attach, the wire guide arm is formed by bending a plate material, the outer surface of the receiving part is bent is bent in the rotational lever direction from the mounting portion, the pivot shaft The vehicle disc brake device is characterized in that the outer surface of the receiving portion and the outer surface of the brake wire holding portion are formed in parallel to each other.

Images