JP2013160256A - Disc brake device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disc brake device for a vehicle, that can suppress to the utmost, an influence on the tolerance of dimensions of a component composing a mechanical operation mechanism and thus suppressing displacement of an initial position of a rotating lever when not operated.SOLUTION: A connecting arm 19b connecting a brake wire 24 is provided in a rotating lever 19 to rotate a rotating shaft 17 of a mechanical operation mechanism 4, and also a positioning part 19c is provided on a side opposite to the connecting arm 19b across the rotating shaft 17. A wire guide arm 9 including a receiving part 9b abutting on the positioning part 19c to position the rotating lever 19 and a brake wire holding part 9i for the brake wire 24 is mounted outside of a bottom wall 2e of a cylinder hole 2d. The receiving part 9b has a positioning abutting surface 9f abutting on the positioning part 19c and formed in a normal direction of the rotating shaft 17.

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

  However, in the above-mentioned Patent Document 1, since the receiving portion provided on the wire guide arm has a positioning contact surface that contacts the positioning portion of the rotating lever, the positioning portion is formed in the tangential direction of the cylinder hole. The contact angle was small, and it was easily affected by the dimensional tolerance of each part. For this reason, there is a possibility that the initial position of the rotating lever may be displaced, and there is a possibility that the parking performance may be deteriorated. Therefore, it is necessary to increase the dimensional accuracy of each component, which causes a cost increase.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle disc brake device that can suppress the influence on the dimensional tolerances of parts constituting a mechanical operating mechanism as much as possible and suppress the deviation of the initial position of the rotating lever when not operating. It is said.

  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 The rotating lever includes a positioning portion that positions an initial state of the rotating lever, and a connecting arm that connects a brake wire that rotates the rotating lever by a pulling operation by an operator. A wire guide arm having a receiving portion for positioning the rotating lever by contacting the positioning portion and a brake wire holding portion for the brake wire outside the bottom wall of the hole In the vehicular disc brake device, the rotating lever is provided with the positioning portion on the opposite side of the connecting arm across the rotating shaft, and the receiving portion is in contact with the positioning portion. The contact surface is formed in the normal direction of the rotation shaft.

  Moreover, it is preferable that the said wire guide arm protrudes the said holding | maintenance part in parallel with the said contact surface for positioning from the attaching part attached to the bottom part of the said cylinder hole. Furthermore, it is preferable that the positioning portion is formed so that a contact portion that contacts the positioning contact surface protrudes in an arc shape. Moreover, it is preferable that the wire guide arm includes a restricting portion that abuts on the turning lever and restricts the turning of the turning lever.

  According to the vehicle disc brake device of the present invention, the positioning contact surface of the receiving portion of the wire guide arm is formed in the normal direction of the rotation shaft. The positioning portion abuts at a substantially right angle, and the initial position of the rotating lever in the non-operating state is positioned. Thereby, variation in the contact position between the positioning part and the receiving part due to the dimensional tolerance of each part can be suppressed as small as possible, and the deviation of the initial position of the rotating lever in the non-operating state can be suppressed to a small level. It is possible to prevent the parking performance from deteriorating without increasing the dimensional accuracy of the parts, and to reduce the cost.

  Further, since the wire guide arm projects the brake wire holding portion in parallel with the positioning contact surface from the mounting portion attached to the bottom wall of the cylinder hole, the brake wire holding portion is formed when the wire guide arm is processed. And the positioning contact surface can be processed in parallel, and the processing accuracy of the positioning contact surface can be improved.

  Further, by projecting the contact portion that contacts the positioning contact surface of the positioning portion in an arc shape, in a non-operating state due to variation in the contact position between the positioning contact surface and the contact portion of the receiving portion The deviation of the initial position of the rotating lever can be minimized.

  In addition, the wire guide arm is provided with a restricting portion that abuts on the turning lever to restrict the turning of the turning lever, thereby preventing the turning lever from turning beyond a predetermined amount. Thus, the mechanical operation mechanism can be operated satisfactorily.

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. It is a perspective view of the wire guide arm which shows the 2nd form example of this invention.

  FIG. 1 to FIG. 6 show a first embodiment of the present invention. The disc brake device 1 is operated by hydraulic pressure generated by the hydraulic pressure generated by the operation of the brake pedal at the action portion 2a of the caliper body 2. FIG. A mechanism 3 and a mechanical actuating mechanism 4 that is actuated by a brake wire pulled by operation of an operator such as a handlebar or a foot pedal are incorporated. 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 the positioning contact surface 9f with which the positioning portion 19c comes into contact It is formed in the normal L1 direction, that is, in the normal direction of a circle centering on the axis of the rotation 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.

  FIG. 7 shows a second embodiment of the present invention. Components that are the same as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The receiving portion 9n of the wire guide arm 9 of the present embodiment includes a rising portion 9p that rises substantially perpendicularly from the mounting portion 9a, and an extension that extends in the orthogonal direction from the tip portion of the rising portion 9p to the side opposite to the mounting portion. And a projecting portion 9r projecting from the tip of the extending portion 9q to the bottom wall side of the anti-cylinder hole 2d, and a positioning contact surface 9s is formed on the side surface of the rotating lever of the projecting portion 9r. The positioning contact surface 9 s is formed in the direction of the normal line L 1 of the rotation shaft 17. In the present embodiment, since the side surface of the turning lever that is the cutting surface of the protrusion 9r becomes the positioning contact surface 9s, the accuracy of the positioning contact surface 9s 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 (4)

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 of the rotating shaft, and the rotating lever positions the initial state of the rotating lever. And a connecting arm for connecting a brake wire for rotating the rotating lever by a pulling operation by an operator, and is in contact with the positioning unit on the outside of the bottom wall of the cylinder hole. In the vehicle disc brake device to which a wire guide arm having a receiving portion for positioning the moving lever and a brake wire holding portion for holding the brake wire is attached, The moving lever is provided with the positioning portion on the opposite side of the connecting arm across the rotation shaft, and the receiving portion has a positioning contact surface that contacts the positioning portion with a normal line of the rotation shaft. A disc brake device for a vehicle characterized by being formed in a direction. 2. The disk brake device for a vehicle according to claim 1, wherein the wire guide arm projects the holding portion in parallel with the positioning contact surface from an attachment portion attached to a bottom portion of the cylinder hole. The vehicle disc brake device according to claim 1, wherein the positioning portion is formed such that a contact portion that contacts the positioning contact surface protrudes in an arc shape. 4. The vehicle disk according to claim 1, wherein the wire guide arm includes a restricting portion that abuts on the turning lever to restrict the turning of the turning lever. 5. Brake device.

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