JPH10246259A - Inter-pad gap adjusting device for disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve holding force of a spindle in respect to a calliper without depending upon a seal ring of the spindle in a device in which a piston-side nut is relatively rotated in respect to the calliper side spindle for adjusting the gap between the pads by the screwing operation. SOLUTION: When a piston 5 is operated by hydraulic presure to a chamber 7, pads 3, 4 approach each other for sandwiching a disc rotor, and perform specified braking operation. When a stroke of the piston 5 reaches backlash between a nut 14 and a spindle 15, the nut 14 stops its operation. The nut 14 is relatively rotated in respect to the spindle 5 and screwed to the outside by cam function between a pin 17 and a tapered groove 13b, for adjusting a gap between the pads. A frictional ring 21 is arranged on the spindle 15 independently of a seal ring 20 for adding holding force thereto in respect to a calliper 2. Adjustment function of the gap between the pad is compensated while keeping fastening margin of the seal ring 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for adjusting a pad gap between a disc rotor and a pad of a disc brake, and more particularly to a pad gap of a so-called built-in disc brake of a floating caliper type having a built-in parking brake mechanism. It relates to an adjusting device.

[0002]

2. Description of the Related Art As described in Japanese Utility Model Publication No. Hei 5-27717, for example, a disc brake of this type includes a torque receiving member fixed to a stationary portion of a vehicle body and restraining a pair of brake pads in a disc rotor rotation direction. A caliper is provided on the torque receiving member so as to float and be movable in the axial direction of the disk rotor. A piston is slidably fitted to the caliper, and one of the brake pads is pressed toward the disk rotor by the hydraulic operation of the piston, and the other brake pad is pressed through the caliper by the reaction force. It is configured to perform a braking action by pressing the disk rotor toward the disk rotor and clamping the disk rotor between the brake pads.

[0003] On the other hand, a disc brake usually has a built-in pad gap automatic adjusting device for automatically adjusting the pad gap between the disc rotor and the brake pad to a predetermined value even when the brake pad is worn. As a pad gap automatic adjustment mechanism, a mechanism described in Japanese Patent Publication No. 51-18038 has been conventionally known. This pad gap automatic adjustment mechanism causes the adjustment nut provided on the piston to rotate when the piston performs a brake pad pressing stroke greater than a set due to wear of the brake pad, and the adjustment nut and the piston hydraulic fluid The pad gap between the brake pad and the disk rotor is automatically adjusted to a predetermined value by a screw action between the adjusting spindle fitted to the caliper so as to project into the pressure chamber.

On the other hand, in many cases, a parking brake mechanism is also built in the disc brake. When the automatic pad gap adjusting mechanism is configured as described above, the parking brake operating force is transmitted to the piston via the adjusting spindle. It is common sense to enable parking brakes.

[0005]

In the case where the above-mentioned automatic pad gap adjusting mechanism is employed, it is desirable that the adjusting spindle is securely held by the caliper in view of the above-mentioned automatic pad gap adjusting function. Otherwise, when the adjusting nut is rotated, the adjusting spindle is rotated, and the automatic adjustment of the pad gap cannot be performed as described above.
However, the seal ring for sealing the fitting portion of the adjustment spindle with the caliper to prevent leakage of hydraulic fluid from the piston hydraulic pressure chamber also has a function of preventing rotation of the adjustment spindle. It has been confirmed that if the tightening allowance is increased, the seal ring may be deformed at an early stage due to repeated strokes of the adjusting spindle during parking brake, which is disadvantageous in terms of durability.

Further, if the above measures are taken to reliably hold the adjustment spindle, the interference of the seal ring and the roughness of the contact surface of the seal ring sensitively affect the holding force of the adjustment spindle. The dimensional control and the processing accuracy of the seal ring contact surface must be strictly controlled, which is disadvantageous in terms of cost, and the strict control still lowers the reliability of the automatic adjustment of the pad gap. .

According to a first aspect of the present invention, the function of holding the adjustment spindle on the caliper is performed by a separate means without relying on the above-mentioned seal ring.
An object of the present invention is to solve the conventional problem.

In the case of a disc brake, it is necessary to manually adjust a pad gap after replacing a component such as a brake pad.
As described in Japanese Patent No. 7717, it is common sense to provide a manual adjustment element by meshing with the adjustment spindle which constitutes the above-mentioned automatic pad gap adjustment mechanism, and to fit this to the caliper. In the manual adjustment of the pad gap, the manual adjustment element is rotated to rotate the adjustment spindle meshed with the element, and the pad gap can be manually adjusted by a screw action between the adjustment spindle and the adjustment nut.

However, since the manual adjusting element has a play in the axial direction, it tends to generate a tapping sound and a chattering sound due to vibration, and it is important to take measures against it. According to a second aspect of the present invention, in addition to taking the countermeasure, the adjusting spindle holding function is also performed, so that it is unnecessary to provide the sealing ring with the adjusting spindle holding function. An object is to solve the above problem.

A third aspect of the present invention is to realize a further improvement of the adjusting spindle holding ability and a prevention of vibration of the manual adjusting element by a combination of the first and second aspects. I do.

A fourth object of the present invention is to provide a simple means for providing an adjusting spindle holding function.

A fifth aspect of the present invention proposes a preferable arrangement of the simple means of the fourth aspect.

A sixth aspect of the present invention is to provide a simple means for preventing vibration of the manual adjustment element.

A seventh object of the present invention is to provide another simple means for preventing vibration of the manual adjustment element.

[0015]

For these purposes, the pad gap adjusting device for a disk brake according to the first invention presses the brake pad toward the disk rotor by hydraulically operating a piston fitted to a caliper. By performing a braking action, when the piston performs a brake pad pressing stroke equal to or greater than a setting, the rotation of an adjustment nut provided on the piston is caused to protrude into the adjustment nut and the piston hydraulic pressure chamber. By the screw action between the adjusting spindle fitted to the caliper, the pad gap between the brake pad and the disc rotor can be automatically adjusted, and the parking brake operating force is transmitted to the piston via the adjusting spindle. In a disc brake that enables a parking brake, a rotational resistance is applied to the adjusting spindle. It is characterized in the provision of the rotation resistance adding means for adding.

In the pad gap adjusting device for a disk brake according to the second invention, a braking operation is performed by pressing a brake pad toward a disk rotor by a hydraulic operation of a piston fitted to a caliper, and the piston operates at or above a set value. When the brake pad pressing stroke is performed, rotation of the adjusting nut provided on the piston is caused to cause rotation between the adjusting nut and the adjusting spindle fitted to the caliper so as to protrude into the piston hydraulic pressure chamber. By screw action,
By automatically adjusting the pad gap between the brake pad and the disc rotor and rotating the adjusting spindle via a manual adjusting element fitted on a caliper to mesh with the adjusting spindle, the adjusting nut and In the disk brake in which the pad gap can be manually adjusted by a screw action during the operation and the parking brake operation force is transmitted to the piston via the adjustment spindle to enable the parking brake, vibration of the manual adjustment element is prevented. A vibration preventing means is provided.

In the pad gap adjusting device for a disc brake according to the third aspect of the present invention, a braking action is performed by pressing a brake pad toward a disc rotor by a hydraulic operation of a piston fitted to a caliper. When a brake pad pressing stroke is performed, rotation of an adjusting nut provided on the piston is caused to cause a screw between the adjusting nut and the adjusting spindle fitted to the caliper so as to protrude into the piston hydraulic pressure chamber. The operation allows the pad gap between the brake pad and the disc rotor to be automatically adjusted, and the adjusting spindle is rotated via a manual adjusting element fitted on a caliper so as to mesh with the adjusting spindle. The pad clearance can be manually adjusted by the screw action between the adjusting nut and the parking brake operating force. In a disc brake in which parking brake is enabled by transmitting to the piston via the adjustment spindle, a rotation resistance adding means for adding rotation resistance to the adjustment spindle is provided, and vibration prevention for preventing vibration of the manual adjustment element is provided. A means is provided.

According to a fourth aspect of the present invention, in the first or third aspect of the present invention, a friction ring is interposed in a fitting portion of the adjustment spindle to the caliper, and the rotational resistance is added by the friction ring. It is characterized by comprising means.

According to a fifth aspect of the present invention, in the pad gap adjusting device for a disc brake according to the fourth aspect, the friction ring is disposed on a side farther from the hydraulic working chamber than the seal ring between the caliper and the adjusting spindle. It is characterized by the following.

According to a sixth aspect of the present invention, in the pad gap adjusting device for a disc brake according to any of the second to fifth aspects, an annular ring is interposed in a fitting portion of the manual adjustment element to the caliper, and the annular ring is used. It is characterized in that the vibration preventing means is constituted.

According to a seventh aspect of the present invention, there is provided the pad gap adjusting device for a disc brake according to any of the second to fifth aspects, wherein the manual adjusting element is biased in the rotation axis direction of the element and pressed against a fixed portion. The vibration preventing means is constituted by means.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a floating caliper type disc brake incorporating a pad gap adjusting device according to an embodiment of the present invention. Reference numeral 1 denotes a torque receiving member which is fixedly attached to a stationary portion of the vehicle body. A caliper 2 is movable on the torque receiving member 1 in the direction of the rotation axis of the disk rotor (not shown) (left and right directions in the figure) so as to float and support the caliper 2 on both sides of the disk rotor. The brake pads 3 and 4 are restrained in the disk rotor rotation direction (the direction perpendicular to the drawing) and supported so as to be movable in the disk rotor axis direction.

The caliper 2 has an inner brake pad 3
And the outer brake pad 4 is received by the reaction portion 2a of the caliper 2. A seal ring 6 is provided at a fitting portion between the caliper 2 and the piston 5 to define a hydraulic pressure chamber 7,
A port 8 communicating with the hydraulic pressure chamber 7 is formed in the caliper 2. Here, when the brake fluid pressure is supplied from the port 8 to the working fluid pressure chamber 7, the piston 5 is pushed leftward in the drawing to urge the inner brake pad 3 in the same direction. On the other hand, the reaction force at this time is transmitted to caliper 2 and reaction part 2
The outer brake pad 4 is urged in the opposite direction via a.
Therefore, the brake pads 3 and 4 are displaced in a direction approaching each other, and a braking action can be performed as predetermined by clamping the disk rotor between these pads.

Next, an automatic apparatus for adjusting the pad gap will be described. The apparatus is basically the same as that described in Japanese Patent Publication No. 51-18038, and has a bottomed hole 5a in the piston 5 so as to open into the chamber 7. And an annular receiving housing 11 is fitted into the bottomed hole 5 a, and the receiving housing 11 is prevented from coming off by a spring ring 12. Then, an engagement sleeve 13 is inserted into a central inner hole of the receiving housing 11, and the engaging sleeve 13 has an end 13 a near the bottom of the hole 5 a as an enlarged conical surface, and the receiving sleeve 11 of the receiving housing 11 opposed thereto is formed. It is assumed that a clutch operation described later is performed between the corner portion and the enlarged diameter conical surface 13a.

An adjusting nut 14 is inserted into the center bore of the engagement sleeve 13, and an adjusting spindle 15 is screwed into the adjusting nut 14. The threaded portion between the adjusting nut 14 and the adjusting spindle 15 has a backlash corresponding to a required pad gap so that the two can be relatively displaced in the axial direction over a corresponding distance.

The left end 14a of the adjusting nut 14 in the drawing is formed as an enlarged flange, and the enlarged flange 14a is pressed against the bottom surface of the piston bottomed hole 5a by a disc spring 16 seated on the receiving housing 11. The adjusting nut 14 is clutch-engaged with the piston 5. Adjustment nut 1
Further, a pin 17 is provided on the outer peripheral surface of the engaging sleeve 13 so as to protrude outward in the radial direction.
b.

Receiving metal housing 1 far from disc spring 16
1, a retaining ring 18 is provided, which is engaged with the adjusting nut 14, so that the receiving metal housing 11 is placed on the adjusting nut 14 between the enlarged flange 14 a of the adjusting nut 14 and the retaining ring 18. , Engagement sleeve 1
3 and the disc spring 16 can be preassembled. Then, a torsion spring 19 is caused to act between the engagement sleeve 13 and the adjusting nut 14, whereby the engagement sleeve 1 is moved.
3 is constantly biased to the initial position with respect to the adjustment nut 14.

The outer periphery 15a of the end of the adjusting spindle 15 remote from the piston 5 is fitted to the caliper 2, and a seal ring 20 is provided on the outer periphery 15a of the fitting end to provide a working fluid pressure chamber 7.
To prevent hydraulic fluid from leaking from In the present embodiment, in particular, the seal ring 20 far from the piston 5
And the outer periphery 15 of the fitting end of the adjusting spindle 15
a is provided with a friction ring 21, thereby constituting a rotation resistance adding means for adding a rotation resistance to the adjusting spindle 15. The friction ring 21 may be either an O-ring or a square ring, and may be made of any material such as rubber or resin. Needless to say, a wire spring may be used instead of these rings.

Next, the parking brake will be described.
It comprises a push rod 22 which abuts against an end face of the adjusting spindle 15 remote from the piston 5 and a cam shaft 23 which is rotated counterclockwise in FIG. The rotation drive of the cam shaft 23 is as follows.
The adjustment spindle 15 is pushed to the left in the drawing by the push rod 22 to urge the inner brake pad 3 toward the disk rotor via the adjustment nut 14 and the piston 5 and, at the same time, by the reaction force thereof, to the outer brake pad 4. Is biased toward the disk rotor, and a predetermined parking brake action can be performed by clamping the disk rotor between the brake pads 3 and 4.

The pad gap manual adjusting device for the case where it becomes necessary to manually adjust the pad gap by replacing the brake pads 3, 4 and the like has the following configuration. Gear teeth 15b are formed on the outer periphery at the end of the adjustment spindle 15 farthest from the piston 5, and a manual adjustment element 24 meshing with the gear teeth 15b is provided rotatably fitted to the caliper 2. Here, the opening end of the hole 2b formed in the caliper 2 for fitting the manual adjustment element 24 is normally closed by a plug 25 made of an inelastic material.

The operation of the disk brake according to the above embodiment will now be described. (1) Service brake operation When the brake fluid pressure flows into the working fluid pressure chamber 7 from the port 8 by depressing the brake pedal, the piston 5 is pushed to the left in the drawing to attach the inner brake pad 3 in the same direction. Energize. On the other hand, the reaction force at this time is transmitted to the caliper 2 to urge the outer brake pad 4 in the opposite direction via the reaction portion 2a. Therefore, the brake pads 3 and 4 are displaced in a direction approaching each other, and a predetermined braking can be performed by clamping the disk rotor between these pads. When the brake fluid pressure disappears, the well-known rollback of the seal ring 6 on the piston 5 returns the piston 5 to the initial position, and the brake pads 3 and 4 are released from the disk rotor to release the braking.

(2) Parking brake operation When a parking brake operation force is input, the rotating cam 2
3 is driven to rotate counterclockwise in the figure. Such camshaft 2
The rotational drive of 3 is performed by pushing the adjusting spindle 15 to the left in the drawing by using the push rod 22 to urge the inner brake pad 3 toward the disk rotor via the adjusting nut 14 and the piston 5, and at the same time A predetermined parking brake operation can be performed by urging the outer brake pad 4 toward the disk rotor with force and clamping the disk rotor between the brake pads 3 and 4.

(3) Pad gap automatic adjusting action When the brake pads 3 and 4 are worn and the service brake is performed, the pad pressing stroke of the piston 5 causes the backlash of the screw between the adjusting nut 14 and the adjusting spindle 15 to occur. If it exceeds, adjust nut 14
Engages with the adjusting spindle 15 and the piston 5
, And the piston 5 moves with only the receiving housing 11 and the engagement sleeve 13 thereafter. Therefore, the flange portion 1 of the adjustment nut 14
4a is separated from the bottom surface of the bottomed hole 5a, the clutch engagement between the two is released, and the adjusting nut 14 becomes rotatable, while the inclined groove 13b is pushed by the pin 17 so that the conical surface of the engaging sleeve 13 13a is pressed against the receiver housing 11, and the engagement sleeve 13 is strengthened in clutch engagement with the receiver housing 11, that is, with the piston 5. Since the receiving housing 11 and the engagement sleeve 13 are integrated with the piston 5 by the above operation, the pin 17 guided by the inclined groove 13 b causes the adjusting nut 14 to resist the spring force of the torsion spring 19. Rotate in the corresponding direction. Thus, the adjusting nut 14 is used to adjust the adjusting spindle 1
5, which absorbs the stroke of the piston 5 greater than the backlash and can automatically adjust the increased pad gap to a predetermined value.

When the piston 5 is returned by the rollback of the seal ring 6 when the brake is released, the bottom surface of the bottomed hole 5a is seated on the flange portion 14a of the adjustment nut 14 screwed out as described above. 14 is clutch-engaged with the piston 5, and in this state, the piston 5 is
4 and receiving sleeve 11 and engagement sleeve 1
Retreat by 3 for backlash with 3. At this time, the engagement sleeve 13 is released from the clutch engagement on the conical surface 13a and becomes rotatable. Therefore, the engagement sleeve 13 is returned to the initial position by the spring force of the torsion spring 19, and the subsequent pad gap automatic adjustment function is performed. You are ready to do it.

During the automatic adjustment of the pad gap, the adjusting spindle 15 is securely held by the friction ring 21 with respect to the caliper 2, so that the automatic adjustment of the pad gap can be compensated. By the way, when the friction ring 21 is used as in the present embodiment when securing the holding force of the adjustment spindle 15 to the caliper 2 as described above, measures to increase the interference in the seal ring 20 of the adjustment spindle 15 are provided. Therefore, it is possible to achieve the intended purpose without performing the above operation, and thus to prevent the seal ring 20 from being deformed early, such as settling, due to repeated parking brakes via the rotating cam 23 and the push rod 22. It is possible to prevent a disadvantage in terms of durability. If the friction ring 21 is used, the holding force of the adjustment spindle 15 can be secured at a low cost with a simple configuration, and the automatic adjustment of the pad gap can be compensated. Further, as can be seen in the embodiment, if the friction ring 21 is disposed farther from the hydraulic pressure chamber 7 than the seal ring 20, it is ensured that the brake fluid enters between the friction ring 21 and the caliper 2. And the holding force of the adjusting spindle 15 by the friction ring 21 can always be kept unchanged.

(4) Pad gap manual adjustment operation When it is necessary to manually adjust the pad gap by replacing the brake pads 3, 4 and the like, the plug 25 is first loosened and removed, and the opening end of the hole 2b is opened. open. Then, the manual adjusting element 24 is rotated with a wrench or the like, and the manual adjusting element 24 and the gear teeth 1 are rotated.
At 5b, the engaged adjusting spindle 15 is rotated. The rotation of the adjusting spindle 15 causes the adjusting nut 14 to advance and retreat by a screw action, thereby changing the position of the piston 5, so that the pad gap can be arbitrarily manually adjusted.

FIGS. 2A and 2B show another embodiment of the present invention. In this embodiment, an annular ring 31 is provided on the outer periphery of the manual adjusting element 24 as vibration preventing means. The vibration of the manual adjustment element 24 is prevented by the frictional force between this and the manual adjustment element insertion hole 2b formed in the caliper 2. According to such a configuration, the annular ring 3
1 prevents vibration of the manual adjustment element 24 to prevent generation of abnormal noise and hammering noise, and also does not add a rotational resistance to the manual adjustment element 24. As a result, the manual adjustment element 24 Since the rotational resistance is also applied to the meshing adjusting spindle 15, the same operation and effect as in the above embodiment can be achieved.

The embodiment shown in FIG. 1 and the embodiment shown in FIG. 2 can be used together as shown in FIG. 3. In this case, the annular ring 31 prevents the manual adjustment element 24 from vibrating. Obviously, both the annular ring 31 and the friction ring 21 can increase the holding force of the adjusting spindle 15, so that the operation and effect in FIG. 1 can be further ensured.

In order to take measures against the manual adjustment element 24, a configuration as shown in FIGS. In the embodiment of FIGS. 4A and 4B, an elastic plug 32 made of rubber or resin is used in place of the plug 25 made of an inelastic material in FIGS. In particular, the elastic plug 32 has such a length as to allow the manual adjustment element 24 to be elastically supported at the insertion limit position at the distal end as shown in FIG. 4B when the elastic plug 32 is mounted, and the inner circumference of the manual adjustment element insertion hole 2b. The elastic plug 32 is formed into a shape having a ridge 32a which functions to prevent the elastic plug 32 from coming off and to function as a seal by entering the groove 2c formed on the surface.

Also in this case, the elastic plug 32 prevents the manual adjustment element 24 from vibrating, and adds rotational resistance to the manual adjustment element 24 and the adjustment spindle 15 to achieve the same operation and effect as in the above embodiment. can do.

In the embodiment shown in FIGS. 5A and 5B, the corrugated spring 3 is provided between the manual adjustment element 24 and the plug 25.
3, the manual adjustment element 24 can be elastically supported at the insertion limit position by the corrugated spring 33 when the plug 25 is screwed. In this case, during the screwing of the plug 25, the manual adjustment element 24
In order to prevent the adjustment spindle 15 from being rotated by the rotation of the adjusting spindle 15, the insertion end of the manual adjustment element 24 is set to the conical clutch surface 24 a, and during the screwing of the plug 25, the conical clutch surface 24 a It is preferable that the manual adjustment element 24 is clutched so as not to rotate against the caliper 2 by being pressed against the bottom surface. Needless to say, even if the tip surface of the plug 25 is coated with a low friction material, a certain effect can be obtained.

Also in the present embodiment, the corrugated spring 33 prevents the vibration of the manual adjustment element 24 and adds a rotational resistance to the manual adjustment element 24 and the adjustment spindle 15, so that the same as in the previous embodiment. A working effect can be achieved.

In the embodiment shown in FIGS. 6A and 6B, a coil spring 34 is interposed between the manual adjustment element 24 and the plug 25, and the coil spring 34 is inserted when the plug 25 is screwed.
With this, the manual adjustment element 24 can be supported at the insertion limit position.

Note that the corrugated plate spring 33 shown in FIG.
May be interposed between the bottom surface of the hole 2b and the manual adjustment element 24. Alternatively, instead of the corrugated spring 33 and the coil spring 34, an elastic body made of rubber or resin may be used. Of course it is good.

[0045]

According to the first aspect of the present invention, there is provided an apparatus for adjusting a pad gap of a disc brake according to the first invention.
An adjusting spindle 15 for adjusting the pad gap together with the adjusting spindle 4
Is provided with the rotation resistance adding means 21 for adding the rotation resistance, the automatic adjustment of the pad gap can be compensated for during the automatic adjustment of the pad gap, the adjustment spindle 15 is reliably held on the caliper 2. By the way, according to the first invention which uses the rotation resistance adding means 21 to secure the holding force of the adjusting spindle 15 with respect to the caliper 2, measures are taken to increase the interference in the seal ring 20 of the adjusting spindle 15. Since the intended purpose can be achieved without performing the above, the seal ring 20 is not early deformed by the repeated parking brake via the rotary cam 23 and the push rod 22, and the durability is improved. Thus, it is possible to increase the holding force of the adjustment spindle 15 while avoiding the disadvantage in the above point.

The pad gap adjusting device according to the second aspect of the present invention relates to a manual adjusting element 24 for manually adjusting a pad gap fitted to the caliper 2 so as to mesh with the adjusting spindle 15. Thus, since the vibration preventing means 31 (32, 33, 34) for preventing the vibration is provided, the vibration preventing means 31 (32, 3
3, 34) not only prevents the manual adjustment element 24 from vibrating but also prevents abnormal noise and hammering sound.
The adjustment spindle 1 which is indirectly engaged with the manual adjustment element 24 also does not
5, the same operation and effect as in the first invention can be achieved.

According to a third aspect of the present invention, there is provided an apparatus for adjusting a pad gap of a disc brake according to a third aspect of the present invention, comprising a rotation resistance adding means 21 according to the first aspect of the invention and a vibration preventing means 31 (32, 33, 34) according to the second aspect of the invention. And the vibration of the manual adjustment element 24 can be prevented by the latter means to prevent the generation of abnormal noise and tapping sound. The adjustment spindle for the caliper 2 can be controlled by the cooperation of the former and the latter means. As a result, the holding effect of the first aspect of the present invention can be further enhanced.

According to a fourth aspect of the present invention, there is provided an apparatus for adjusting a clearance between pads of a disc brake according to the fourth invention, wherein the rotation resistance adding means according to the first invention or the third invention is interposed in a fitting portion between the caliper 2 and the adjustment spindle 15. Friction ring 2
Since the configuration 1 is used, the holding force of the adjusting spindle 15 with respect to the caliper 2 can be increased with a simpler configuration, and the operation and effect thereby can be realized simply and inexpensively.

According to a fifth aspect of the present invention, in the disk brake pad clearance adjusting apparatus according to the fifth aspect, the friction ring 21 in the fourth aspect of the invention is provided with a piston operating hydraulic pressure lower than the seal ring 20 between the caliper 2 and the adjusting spindle 15. Since the brake fluid is disposed farther from the chamber 7, the brake fluid in the chamber 7 does not reach the friction ring 21, and the concern that the holding power of the adjusting spindle 15 is reduced by the brake fluid can be eliminated.

According to a sixth aspect of the present invention, in the pad gap adjusting device for a disk brake, the vibration preventing means according to the second to fifth aspects is interposed in a fitting portion of the manual adjusting element 24 to the caliper. Since it is constituted by the annular ring 31, the vibration preventing means can be made simpler and cheaper.

According to a seventh aspect of the present invention, in the pad gap adjusting device for a disc brake, the vibration preventing means according to the second to fifth aspects of the present invention urges the manual adjusting element 24 in the direction of the rotation axis thereof. Elastic means 3 for pressing against fixed part
2 (33, 34), the vibration preventing means can be made simpler and cheaper in this case as well.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a disc brake provided with a pad gap adjusting device according to an embodiment of the present invention.

FIG. 2 (a) is a longitudinal sectional side view of a manual adjustment element showing another embodiment of the present invention, and FIG. 2 (b) is a main part of a disc brake provided with a pad gap adjusting device according to the embodiment. It is sectional drawing.

FIG. 3 is a longitudinal sectional side view similar to FIG. 1, showing a disc brake provided with a pad gap adjusting device according to still another embodiment of the present invention.

FIG. 4A is an exploded explanatory view of a manual adjustment element and a plug showing still another embodiment of the present invention, and FIG. 4B is a disc brake provided with a pad gap adjusting device according to the embodiment; It is principal part sectional drawing of.

FIG. 5A is an exploded explanatory view of a manual adjustment element and a corrugated spring showing still another embodiment of the present invention, and FIG.
It is principal part sectional drawing of the disc brake provided with the pad clearance adjustment apparatus which becomes the embodiment.

FIG. 6A is an exploded explanatory view of a manual adjustment element and a coil spring according to still another embodiment of the present invention, and FIG.
FIG. 2 is a sectional view of a main part of a disc brake provided with the pad gap adjusting device according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torque receiving member 2 Caliper 3 Inner brake pad 4 Outer brake pad 5 Piston 6 Piston seal ring 7 Hydraulic pressure chamber 8 Brake fluid pressure supply port 11 Receptacle housing 12 Spring ring 13 Engagement sleeve 14 Adjustment nut 15 Adjustment spindle 16 yen Leaf spring 17 Pin 19 Torsion spring 20 Adjustment spindle seal ring 21 Friction ring (Rotation resistance adding means) 22 Push rod 23 Rotating cam 24 Manual adjustment element 25 Inelastic plug 31 Annular ring (Vibration prevention means) 32 Elastic plug (Vibration prevention means) ) 33 Corrugated plate spring (vibration prevention means) 34 Coil spring (vibration prevention means)

Claims (7)

[Claims] 1. A brake operation is performed by pressing a brake pad toward a disk rotor by a hydraulic operation of a piston fitted to a caliper, and when the piston performs a brake pad pressing stroke exceeding a set stroke, the piston is pressed. The rotation of the adjustment nut provided causes the adjustment nut and the adjustment spindle fitted to the caliper so as to protrude into the piston working hydraulic pressure chamber, so that the brake pad and the disk rotor can be rotated. A disk gap that enables automatic adjustment of the pad gap of the disc and transmits parking brake operating force to the piston via the adjustment spindle to enable parking brake; and a rotation resistance adding means for adding rotation resistance to the adjustment spindle. A pad gap adjusting device for a disc brake, which is provided. 2. A brake operation is performed by pressing a brake pad toward a disk rotor by a hydraulic operation of a piston fitted to a caliper, and a braking action is performed. The rotation of the adjustment nut provided causes the adjustment nut and the adjustment spindle fitted to the caliper so as to protrude into the piston working hydraulic pressure chamber, so that the brake pad and the disk rotor can be rotated. By automatically adjusting the pad gap of the adjusting nut, the adjusting spindle is rotated through a manual adjusting element fitted to a caliper so as to mesh with the adjusting spindle, so that the pad gap is screwed with the adjusting nut. And manually transmitting the parking brake operating force to the piston via the adjustment spindle. A disk brake pad clearance adjustment device, wherein a vibration preventing means for preventing vibration of the manual adjustment element is provided. 3. A brake operation is performed by pressing a brake pad toward a disk rotor by a hydraulic operation of a piston fitted to a caliper, and a braking action is performed. The rotation of the adjustment nut provided causes the adjustment nut and the adjustment spindle fitted to the caliper so as to protrude into the piston working hydraulic pressure chamber, so that the brake pad and the disk rotor can be rotated. By automatically adjusting the pad gap of the adjusting nut, the adjusting spindle is rotated through a manual adjusting element fitted to a caliper so as to mesh with the adjusting spindle, so that the pad gap is screwed with the adjusting nut. And manually transmitting the parking brake operating force to the piston via the adjustment spindle. A disc brake provided with a rotation resistance adding means for adding a rotation resistance to the adjusting spindle, and a vibration preventing means for preventing vibration of the manual adjusting element. Pad gap adjusting device. 4. A pad for a disc brake according to claim 1, wherein a friction ring is interposed in a fitting portion of said adjusting spindle to said caliper, and said friction ring constitutes said rotation resistance adding means. Gap adjustment device. 5. The friction ring according to claim 4,
A pad gap adjusting device for a disc brake, wherein the device is disposed farther from the piston hydraulic pressure chamber than a seal ring between the caliper and the adjusting spindle. 6. The vibration preventing means according to claim 2, wherein an annular ring is interposed in a fitting portion of said manual adjustment element to said caliper, and said annular ring constitutes said vibration preventing means. Disc brake pad clearance adjustment device. 7. The vibration preventing means according to claim 2, wherein the manual adjustment element is configured to be elastically urged in the rotation axis direction of the element and pressed against a fixed portion. Characteristic pad clearance adjustment device for disc brakes.