JPH0312979Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a vehicle disc brake in which friction pads are pushed by a floating caliper, which prevents rattling of the friction pads and allows the calipers to move smoothly without tilting. This relates to a padded spring that can be slid on.

[Conventional technology]

Pad springs used in disc brakes are generally attached to the bridge of the caliper.
The friction pad is resiliently supported toward the inner circumference of the disc rotor.

The caliper that presses the friction pad against the disc rotor has a hydraulically actuated piston installed in the action part, which inevitably increases the size and weight of the action part, and the caliper tilts to ensure smooth operation. For example, U.S. Patent No. 4321984
There is a technique disclosed in the specification of No.

This technology involves locking the end of a rod-shaped spring that serves as a caliper stay on a bracket that supports the caliper, supporting the lower surface of the caliper in the middle of the spring, and using its elastic force to move the actuating part into the disk. The caliper is biased toward the outer circumference of the rotor to hold the caliper parallel to the disk axis.

[The problem that the idea attempts to solve]

Therefore, in order to prevent rattling of the friction pad and tilting of the caliper, two parts, the pad spring and the caliper stay, are required, and since they are manufactured and installed separately, the in-process costs increase and the There is a problem. In order to solve this problem, it would be possible to integrate the pad spring and the caliper stay, but this is difficult to realize and has not been put to practical use because the attachment points and functions of the two are different.

Further, in the pad spring structure described above, since sliding resistance is generated between the pad spring and the friction pad, the return of the friction pad is poor, which causes the friction pad to drag.

The present invention was developed against the background of the above circumstances.The pad spring, which prevents rattling of the friction pad, has the function of a carrier stay, improves manufacturing and installation ease, and reduces in-process costs. The purpose of this invention is to provide a padded spring that is designed to provide a comfortable fit.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention includes a pair of friction pads that are arranged opposite to each other with the disc rotor in between, inside the action and reaction parts of the calipers located on both sides of the disc rotor. In a pad spring for a vehicle disc brake that biases in a direction, the pad spring has a sliding portion provided in contact with the back surface of the friction pad, and a portion of the friction pad continuous with the outer circumferential side of the disc rotor of the sliding portion. a spring portion that springs the upper surface shoulder portion toward the inner circumferential direction of the disc rotor; and a guide portion that supports the operating lower surface of the caliper and is continuous with the inner circumferential side of the disk rotor of the sliding portion, and the sliding portion has: The friction pad is characterized in that an elongated guide hole is formed in the radial direction of the disc rotor, and a retaining pin fixed to the back surface of the friction pad is inserted into the guide hole and attached to the friction pad.

〔Example〕

An embodiment in which the present invention is applied to a disc brake with a parking brake will be described below with reference to the drawings.

The caliper 1 consists of an action part 1a and a reaction part 1b arranged on both sides of the disc rotor 2, and a bridge part 1c connecting these parts across the outer periphery of the disc rotor 2, and includes a sliding pin fixed to the action part 1a. 3, 3 are supported movably in the axial direction of the disk by a bracket 4 that guides them.

In the action part 1a, a piston 6 is inserted into a cylinder hole 5 that is open on the disk rotor 2 side, and a hydraulic chamber 7 is defined at the rear side of the piston 6. An inlet 8 for introducing hydraulic pressure supplied from a hydraulic pressure generating device is opened.

The caliper 1 has a pair of friction pads 1 that lock the back plates 9 and 10 to the locking steps of the bracket 4.
1 and 12 are arranged to face each other with the disc rotor 2 in between, and a pad spring 13 is attached to the friction pad 11 on the acting part 1a side, and a pad spring retainer 1 is attached to the friction pad 12 on the reaction part 1b side.
4 are arranged respectively.

When the pressure fluid from the hydraulic pressure generator is supplied to the hydraulic chamber 7 from the inlet 8, the piston 6 moves forward and presses one of the friction pads 11 against one side of the disc rotor 2, and this reaction force causes When the caliper 1 moves toward the action part 1a, the reaction claw 1d of the reaction part 1b presses the other friction pad 12 against the other side of the disc rotor 2 to perform a braking action.

The hydraulic chamber 7 is provided with an adjustment nut 15, an adjustment bolt 16, and a sleeve piston 17 that automatically adjust the braking gap between the disc rotor 2 and both friction pads 11, 12. A camshaft 19 of a parking operating mechanism that mechanically pushes the piston 6 is rotatably fitted into a shaft hole 18 orthogonal to the cylinder hole 5. 1a
It is always biased in the non-operating direction by the biasing force of a coil spring 20 wound around the outer periphery of the protruding end protruding from one side.

The adjusting nut 15 is installed inside the piston 6, and the adjusting bolt 16 is installed inside the adjusting nut 15 by screwing a threaded portion 16a at the tip thereof.The rear part of the adjusting bolt 16 is connected to the cylinder hole 5 and the shaft. It is supported by a sleeve piston 17 having a small diameter portion 17a inserted into a small diameter communication hole 21 that communicates with the hole 18.

A bearing 22 is installed in the shaft hole 18 between it and the camshaft 19, and the cam groove 1 formed in the camshaft 19 is inserted into the shaft hole 18.
9a and the small diameter portion 17a of the sleeve piston 17
A driven rod 23 is interposed between the camshaft 1 and the camshaft 1 when the parking brake is operated.
9 rotates, the driven rod 23 advances the sleeve piston 17, and the adjustment bolt 16 and the adjustment nut 15 meshing therewith also advance to push the piston 6, similar to the hydraulic operation described above. A braking action is performed by pressing both friction pads 11 and 12 against the disc rotor 2.

The pad spring 13 on the side of the action part 1a has a slide part 13a that is inserted into a guide groove 9a recessed in the back surface of the back plate 9, and a slide part 13a that is continuous with the outer circumferential side of the disc rotor of the slide part 13a. A spring part 13b that springs the upper surface shoulder part toward the inner circumferential direction of the disc rotor 2, and a guide part 13c that supports the lower surface of the action part 1a of the caliper 1, which is continuous with the inner circumferential side of the disc rotor of the slide part 13a. It is configured.

The spring portion 13b is composed of a loop portion 13d that is folded back toward the inner circumferential side of the disc rotor 2, and a pressing plate 13e that presses the upper surface shoulder portion of the back plate 9. Holding arms 13f, 13f are provided to hold the portion 1a more reliably.
has been extended.

This guide portion 13c is connected to both friction pads 11,1.
It is formed with a sufficient length from the sliding pin 3, which is the mounting position of the caliper 1, so as to withstand the load fluctuation of the working part 1a of the caliper 1, which adjusts toward the working part side as the caliper 2 wears.

The slide portion 13a has a long guide hole 13g.
is formed in the radial direction of the disc rotor 2, and in the pad spring 13, a stop pin 24 press-fitted into the back surface of the back plate 9 is inserted into the guide hole 13g, and the large diameter head 24a of the pin 24 is inserted into the guide hole 13g. A large-diameter head 2 that protrudes from the back of the back plate 9 and is prevented from coming off.
4a is fitted into the recess 6a of the piston 6, and also serves to prevent the piston 6 from rotating during braking operation.

The present embodiment is constructed as described above, and the pad spring 13 installed as described above is guided by the guide hole 13g and the elastic force of the loop portion 13d.
The friction pad 11 is elastically supported so as to be slidable in the radial direction of the disc rotor 2, so that the friction pad 11 is pressed against the disc rotor 2 by the pressing plate 13e.
At the same time, the guide portion 13c urges the heavy acting portion 1a toward the outer circumference of the disk rotor 2, elastically supporting the caliper 1 parallel to the disk axis, and pressing the friction pad 11 to prevent uneven wear and the occurrence of hammering sounds.

As described above, the pad spring 1 of this embodiment
3 has the function of a carrier stay in the conventional pad spring, so it can reduce the installation process and has excellent manufacturing efficiency, which reduces the work-in-progress cost. It's increasing.

In the above embodiment, a disc brake with a parking brake is described, which is heavy on the action side, but the present invention can also be applied to a disc brake without a parking brake.

[Effect of idea]

As explained above, the pad spring of the present invention has a sliding part provided in contact with the back surface of the friction pad, and a shoulder part of the upper surface of the friction pad continuous with the outer circumferential side of the disc rotor of the sliding part. A spring part that springs in the inner circumferential direction, and a guide part that supports the working lower surface of the caliper and is continuous with the inner circumferential side of the disc rotor of the sliding part, and the sliding part is provided with a long guide hole. The friction pad is installed by inserting a retaining pin fixed on the back side of the friction pad into the guide hole formed in the radial direction of the rotor, so it can function as both a pad spring and a carrier stay, and it can be installed easily in the installation process. Excellent in reduction and manufacturability, reducing in-process costs.

[Brief explanation of drawings]

The figures show an embodiment in which the present invention is applied to a disc brake with a parking brake. Fig. 1 is a perspective view of a pad spring attached to a friction pad, Fig. 2 is a cross-sectional front view of the disc brake, and Fig. 3 is a perspective view of a pad spring attached to a friction pad. is also a side view. 1... Caliper body, 1a... Action part, 1b
... Reaction part, 2 ... Disc rotor, 3 ... Sliding pin, 4 ... Bracket, 6 ... Piston,
9, 10... Back plate, 9a... Guide groove, 11, 12
...Friction pad, 13...Pad spring, 1
3a...slide part, 13b...spring part,
13c...Guide part, 13d...Loop part, 13
e...pressing plate, 13f...holding arm, 13g...guide hole, 14...pad spring retainer, 2
4... Stopping pin, 24a... Large diameter head.

Claims (1)

[Scope of utility model registration request] A disc brake pad for a vehicle that urges a pair of friction pads, which are placed opposite to each other with the disc rotor in between, inside the action and reaction parts of the calipers located on both sides of the disc rotor, toward the inner circumference of the disc rotor. In the spring, the pad spring includes a sliding portion provided in contact with the back surface of the friction pad, and a portion of the sliding portion that is continuous with the outer circumferential side of the disk rotor, and elasticizes the shoulder portion of the upper surface of the friction pad in the inner circumferential direction of the disk rotor. A spring part that emits
Continuously on the inner circumferential side of the disc rotor of the sliding part,
a guide portion that supports the working lower surface of the caliper, an elongated guide hole is formed in the slide portion in the radial direction of the disc rotor, and a stop pin is fixed to the back surface of the friction pad in the guide hole. A padded spring for vehicle disc brakes, which is characterized by being installed by inserting it.