JPH0671348U - Disc brake with parking - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to adapt to various parking cables and change the eigenvalue by simple means, and further to suppress the initial lost stoke in the parking brake. A cylinder 3 is formed in a caliper body 1, and a piston 4 and a plug 5 are fitted in the cylinder 3 to define a hydraulic chamber 6. Adjuster 8 provided in hydraulic chamber 6
The spindle 9 of is engaged with the plug 5. Plug 5
Contacts the cam 17 via the connecting rod 16. The connecting rod 16 and the cam 17 are
It is arranged in the parking housing 18. The parking housing 18 is assembled to the caliper body 1 by being screwed onto the rear end side 3c of the small diameter portion 3b of the caliper body 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc brake equipped with a parking brake, and more particularly to a disc brake with parking characterized by the caliper.

[0002]

[Prior art]

 Conventionally, as a disc brake having a parking brake, for example, there is one described in Japanese Utility Model Laid-Open No. 1-60038. In this case, the caliper is formed with a cylinder that opens toward the disc rotor. The cylinder is composed of a large diameter portion, a small diameter portion, and a parking working chamber in order from the disk rotor side, and a cup-type piston whose closed end wall is the opening end side of the cylinder is liquid-tight in the large diameter portion. And a slidable fit to define a hydraulic chamber, and an adjuster consisting of a sleeve nut and a spindle screwed together is provided coaxially with the piston in the hydraulic chamber, and the spindle has a small diameter part in the adjuster. The side end is engaged with a plug that fits into the small diameter portion in a liquid-tight and slidable manner. One end of the connecting rod abuts on the parking operation chamber side of the plug, and the other end of the connecting rod is connected to a cylindrical cam that is rotated by a parking cable.

The connecting rod and the cam constitute a parking operation member, and the plug is urged toward the parking operation chamber by a return spring arranged in the hydraulic chamber. When the brake pedal is depressed, the master cylinder operates, and the cup piston is operated by the hydraulic pressure from the master cylinder to press the brake pads on both sides of the disc rotor.

Further, when an operating portion such as a lever of a parking brake is operated, a cam rotates via a parking cable, a plug is pushed toward a disc rotor via a connecting rod, and the plug engages with the plug. The cup-shaped piston moves to the disc rotor side through the adjusters that are fitted together, and the brake pad is pressed against the disc rotor.

The parking actuating member uses a cam mechanism, but in addition to this, a lever mechanism or a screw mechanism may be used.

[0006]

[Problems to be solved by the device]

 However, in the disc brake with parking as described above, the caliper main body containing the hydraulic pressure chamber and the parking operation chamber forming portion for guiding the parking operation member that operates in cooperation with the parking brake are integrally formed. Therefore, it is necessary to change the entire caliper according to the in-vehicle requirements for the parking cable for the parking brake, which differ depending on the vehicle model.

In addition, in order to change the eigenvalue of the caliper in response to the occurrence of abnormal noise such as squeal of the brake, it is necessary to change the shape of the caliper itself such as the buildup. Further, if the caliper main body and the parking working chamber forming portion are integrally formed as described above, it is difficult to correct so-called build-in clearance due to backlash of the screwing portion of the adjuster, so that it is difficult to correct the cup-type piston. An error occurs in the rotation amount of the cam with respect to the predetermined movement amount, and following this, a lost stroke occurs in the initial operation of the parking lever, which leads to a deterioration of the operation feeling.

The present invention has been made in view of the above problems, and by a simple means, it is possible to adapt to various parking cables and change the eigenvalue, and further, in the parking brake. The purpose is to provide a disc brake with parking that can suppress the initial lost stoke.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, in the disk brake with parking of the present invention, a cylinder having a disc rotor side opening is formed in the caliper, and the cylinder has a large diameter portion, a small diameter portion, and a parking portion in order from the disc rotor side. It is composed of a working chamber, and a piston with the open end side of the cylinder as the closed end wall is fitted in a large-diameter part in a liquid-tight and slidable manner to define a hydraulic chamber. An adjuster in which two members are screwed together is disposed coaxially with the piston, and the small diameter side of the adjuster is engaged with a plug that fits in the small diameter portion in a liquid-tight manner and axially movable. Further, in the parking brake disc brake with a parking operation member, which is connected to the parking cable and moves the plug in the axial direction, is provided in the parking operation chamber. The working chamber forming portion is formed separately from the caliper body, and a spacer is interposed between the caliper body and the parking working chamber forming portion, which face each other in the moving direction of the cup-shaped piston. I am trying.

At this time, the parking operation chamber forming portion may be assembled to the caliper body by screwing. Alternatively, the parking working chamber forming portion may be assembled to the caliper body by spline fitting. At this time, it is preferable to insert a spacer between the end faces of the caliper body and the parking operation chamber forming portion that face each other in the moving direction of the cup-shaped piston.

[0011]

[Action]

 According to the vehicle mounting requirements of the parking cable in the parking brake, which differs depending on the vehicle type, it is possible to change only the parking working chamber forming part that guides the parking operating member without changing the caliper body that incorporates the brake cylinder device body. Addresses the various on-board requirements noted above.

At this time, since the parking operation chamber forming portion is not involved in the formation of the hydraulic chamber of the cylinder, it is not necessary to make the assembly portion with the caliper body liquid-tight, and the assembling is easy. Become. Therefore, the parking working chamber forming portion can be attached to the caliper body so as to be displaceable in the moving direction of the piston and detachable by screw fitting, spline fitting, or the like.

Then, a stroke play from the set value of the piston when the parking brake is actuated due to backlash of the meshing portion between the members forming the adjuster, etc., is provided with a spacer having a predetermined thickness. To prevent the initial lost stroke of the parking lever and other operating parts of the parking brake.

[0014]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. First, the configuration will be described. As shown in FIGS. 1 and 2, a caliper main body 1 is formed with a brake operating cylinder 3 that opens toward one side surface of the disc rotor 2, and the caliper main body 1 extends beyond the disc rotor 2. An extending bridge-shaped member 1a is provided, and the bridge-shaped member 1a is formed with a facing portion 1c capable of pressing the other side surface of the disk rotor 2.

The cylinder 3 has a large diameter portion 3a extending in a direction away from the disc rotor 2, that is, a rear portion, and a small diameter portion 3b is formed coaxially with the large diameter portion 3a and has a rear end opened. The cup-shaped piston 4 is slidably fitted to the large-diameter portion 3a with the closed end wall facing the opening end on the disc rotor 2 side in a state where the rotation is regulated in a liquid-tight manner. A hydraulic chamber 6 is defined in the cylinder 3 by fitting the plug 5 into the small diameter portion 3b in a liquid-tight and slidable manner. The hydraulic chamber 6 communicates with a master cylinder 3 (not shown).

Further, brake pads 7a 1 and 7b, which are braking members, are arranged on both sides of the disc rotor 2, respectively. The brake pad 7a on the cylinder 3 side is movable in the axial direction of the disc rotor 2, but is supported in a state in which the rotation is restricted, and the other brake pad 7b is also restricted in rotation, but is opposed. The portion 1c is provided so as to move in the axial direction opposite to the pad 7a and press against the disc rotor 2.

Inside the hydraulic chamber 6, an adjuster 8 composed of two members is provided. The adjuster 8 is composed of a spindle 9 having an external thread engraved on the outer circumference thereof and a sleeve nut 10 having an internal thread engraved on the inner surface thereof, and has a necessary back clearance corresponding to the amount of return of the cup-type piston 4. It has a screw fit. A step portion 10a is formed on the sleeve nut 10 of the adjuster 8, and a disc spring 12 is interposed between the step portion 10a and a circlip 11 attached to the inner peripheral wall of the cup-type piston 4, The sleeve nut 10 is urged by the cup type piston 4 toward the bottom side of the blind hole. In addition, reference numeral 13 in FIG. 1 denotes a thrust bearing.

Further, the spindle 9 has a threaded portion that is screwed into the sleeve nut 10 as described above, and a shaft portion 10a that subsequently extends rearward, and the head portion 10b at the tip of the shaft portion has the small diameter described above. It is engaged with the plug 5 fitted in the portion 3b. A clip 14 such as a C-ring is arranged between the neck of the head 10b and the end surface of the plug 5 on the hydraulic chamber 6 side.

The plug 5 is rotation-regulated and liquid-tightly fitted to the small-diameter portion 3b, and its rear end is open to the atmosphere. A return spring 16 is arranged between the clip 14 and a spring receiving member 15 fixed to the caliper body 1, and the return spring 16 urges the plug 5 and the spindle 9 rearward. A recess 5a is formed on the rear end surface of the plug 5, and a connecting rod 16 having one end abutted on the recess 5a extends rearward, and the other end abuts on the notch of the cylindrical cam 17. The cam 17 communicates with the parking repeller, which is the operation unit, via the parking cable.

The connecting rod 16 and the cam 17 constituting the parking operation member are arranged in a parking housing 18 which is a separate body from the caliper body 1, and the cam 17 serves as the parking housing 18. It is rotatably supported in the parking working chamber 18a. The parking housing 18 has an opening on the front end side, and an internal thread is engraved on the inner peripheral surface of the opening 18b. Further, the parking housing 18 has an internal thread on the outer periphery of the rear end side 3c of the small diameter portion 3b of the caliper body 1. The parking housing 18 is assembled to the caliper main body 1 by engraving a male screw capable of being screwed and screwing between the two 18b and 3c. In FIG. 1, 19 is a nut for adjusting the positioning and the angle of the parking housing 18.

Then, when the brake pedal is depressed, the master cylinder operates and the hydraulic pressure from the master cylinder moves the cup-shaped piston 4 to the disc rotor 2 side, so that one brake pad 7a is moved to the disc rotor 2a. The caliper main body 1 is moved in the opposite direction by a reaction while being pressed against 2, and the other brake pad 7b presses against the disk pad 7a via the facing portion 1c.

When the parking lever is operated, the cam 17 rotates via the parking cable by an amount corresponding to the stroke of the parking lever, and the plug 5 moves against the return spring via the connecting rod 16. And push it toward the disc rotor 2. Then, the cup type piston 4 is pushed toward the disc rotor 2 side through the adjuster 8 engaged with the plug 5, and the break pad 7a is pushed against the disc rotor 2 in the same manner as described above.

The parking actuating member uses the cam 17 mechanism, but it may use a lever mechanism, a screw mechanism, or the like. In the disc brake with parking as described above, the parking housing 18 is assembled to the caliper main body 1 by screw fitting as described above, so that it can be easily assembled and the cylinder 3 The mounting amount of both can be finely adjusted in the axial direction. That is, the positions of the plug 5 and the adjuster 8 pressed by the connecting rod 16 when the parking brake is released can be corrected.

As shown in FIG. 3, the threaded portion between the spindle 9 and the sleeve nut 10 of the adjuster 8 is in the brake release state (FIG. 3 (b)) due to the accuracy of the teeth of the screw and the assembly error. ), When there is a backlash in the spindle 9 at the time of shifting the brake operation (FIG. 3 (a)), and the caliper body 1 and the parking housing 18 are integrally molded as in the conventional case, Although it is not possible to cope with the backlash, in the present embodiment, as described above, when the parking housing 18 is assembled, the annular spacer 20 having a thickness corresponding to the backlash amount is By interposing between the rear end of the caliper body 1 and the parking housing 18, the parking housing 18 relative to the caliper body 1 in the cylinder 3 axial direction. By adjusting the assembly position, it is possible to suppress the initial galactic loss that occurs in the parking lever.

Furthermore, the mounting position and angle of the parking housing 18 can be adjusted by the tightening position of the nut 19. The backlash amount is small, for example, 0.35 mm, but when converted to the stroke amount of the parking lever, it is large, for example, 13.9 mm and cannot be ignored.

Further, the shape of the parking actuating member differs depending on the on-vehicle requirement of the parking cable. In that case, it is necessary to change only the parking housing 18 to one that meets the on-vehicle requirement. The caliper body 1 which is the body of the brake need not be changed. Further, when it is desired to change the eigenvalue of the caliper in response to an abnormal sound such as squeal, it is possible to replace the caliper body 1 with the parking housing 18 having a different weight without changing the caliper body 1.

In the above embodiment, the caliper body 1 and the parking housing 18 are assembled by screwing, but they may be assembled by spline fitting 21 as shown in FIG.

[0028]

[Effect of device]

 As described above, in the disc brake with parking of the present invention, it is not necessary to change the entire caliper due to the simple means to change the in-vehicle requirement of the parking cable and the eigenvalue of the caliper against abnormal noise. It is possible to absorb the build-in clearance such as the backlash of the adjuster 8 by a simple means and prevent the initial lost stroke from occurring in the operating part of the parking brake.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a disc brake with parking according to an embodiment of the present invention.

FIG. 2 is a rear view showing the disc brake with parking according to the embodiment of the present invention.

FIG. 3 is a view showing the engagement of the adjuster of the embodiment according to the present invention.

FIG. 4 is a side sectional view showing the assembling of the caliper body and the parking housing of the second embodiment according to the present invention.

[Explanation of symbols]

 1 Caliper body 2 Disc rotor 3 Cylinder 3a Large diameter part 3b Small diameter part 4 Piston 5 Plug 6 Hydraulic chamber 8 Adjuster 16 Connecting rod 17 Cam 18 Parking housing 18a Parking working chamber

Claims (3)

[Scope of utility model registration request] 1. A caliper is formed with a cylinder open to the disk rotor side, and the cylinder is composed of a large diameter portion, a small diameter portion, and a parking working chamber in order from the disk rotor side, and the cylinder has a large diameter portion. A piston having the opening end side as a closed end wall is fluid-tightly and slidably fitted to define a hydraulic pressure chamber, and an adjuster in which two members are screwed into each other is provided in the hydraulic pressure chamber. The small diameter portion side of the adjuster, which is arranged coaxially with the piston, engages with a plug that fits in the small diameter portion so as to be liquid-tight and axially movable, and further connected to the parking cable in the parking operation chamber. In a disc brake with parking provided with a parking operation member that moves the plug in the axial direction, the parking operation chamber forming portion is formed separately from the caliper body, and A disc brake with parking characterized in that a spacer is interposed between the end faces of the lipa body and the parking operation chamber forming portion that face each other in the moving direction of the cup-shaped piston. 2. The disc brake with parking according to claim 1, wherein the parking operation chamber forming portion is assembled to the caliper body by screw fitting. 3. The disc brake with parking according to claim 1, wherein the parking operation chamber forming portion is assembled to the caliper body by spline fitting.