JPH0223870Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a disc brake.

(Prior Art) Generally, a disc brake has a carrier fixed to a non-rotating member of a vehicle on one side of the disc and having a pair of legs spaced apart in the circumferential direction of the disc, and a carrier between the legs of the carrier. A friction pad is provided, a caliper is provided to press the friction pad toward the disk, and a caliper is provided to extend in the axial direction of the disk at a portion of each pair of legs that straddles the outer periphery of the disk. a connecting portion that slidably connects the friction pad to the caliper; and a pad that presses the friction pad against the carrier and slidably supports the friction pad in the axial direction of the disk to prevent vibration of the friction pad. As shown in FIGS. 4 and 5, the pad spring 21 is attached to the inner wall 2 of the leg portion 23 of the carrier 22.
4, a pressing part 27 extending from the base 25 and pressing the friction pad 26 against the carrier 22, and a step formed at the inner end (lower end in the figure) of the inner wall 24 of the carrier leg 23. Part 24a
It is configured to have a bent portion 25a that comes into contact with the base portion 25, and a retaining portion 28 that is formed by being bent from the base portion 25. Note that the reference numeral 29 is a disk. Conventionally, the pad spring 21 has a pressing portion 27 that presses the friction pad 26 against the carrier 22 to prevent vibration of the friction pad 26, and a base portion 25 and a bent portion 25a. The friction pad 26 constitutes a sliding part on which it slides to protect the inner wall 24 of the leg part 23, and the retaining part 28 is connected to the wall part 30a of the carrier 22 facing the disc circumferential surface of the connecting part 30 and the disc 29. The pad spring 21 itself is inserted between the pad spring 21 and the peripheral surface of the pad spring 21 to prevent it from slipping out upward.

By the way, in the conventional actual design, the dimension b between the bending part 25a of the pad spring 21 and the retaining part 28 is the dimension b between the corner part X of the wall part 30a of the connecting part 30 of the carrier 22 and the step part 24a. is set smaller than the dimension a of the wall part 30a to allow for an error between the dimension a and the dimension b during manufacturing, and the retaining part 28 is set smaller than the dimension a of the wall part 30a.
The base 25 of the pad spring 21 is inserted with a margin between the pad spring 21 and the circumferential surface of the disk 29 to ensure that the base 25 of the pad spring 21 is brought into close contact with the inner wall 24 of the leg 23 of the carrier 22.

(Problem to be solved by the invention) However, because of this structure, the pad spring 21 causes play in the vertical direction of the carrier 22, which causes abnormal noise due to vibration etc. during driving. This is causing a problem.

Therefore, the present invention solves the above problems and
The technical problem is to ensure that the base of the pad spring can be brought into close contact with the inner wall of the leg of the carrier without causing play in the vertical direction of the pad spring relative to the carrier. .

(Means for Solving the Problems) Therefore, the present invention provides a carrier having a pair of legs fixed to a non-rotating member of a vehicle on one side of a disk and spaced apart in a circumferential direction of the disk; a friction pad disposed between both legs of the disc, a caliper for pressing the friction pad toward the disc, and a caliper extending in the axial direction of the disc at a portion of each pair of legs that straddles the outer periphery of the disc. a connecting portion that slidably connects the carrier and the caliper, and a pad spring that presses the friction pad against the carrier and supports the friction pad so as to be slidable in the axial direction of the disk. , the pad spring includes: a base portion that is in close contact with the inner wall of the leg portion of the carrier; a pressing portion that extends from the base portion and presses the friction pad against the carrier; and formed at an inner end of the inner wall of the leg portion of the carrier. a bent part that abuts the stepped part and forms a sliding part of the friction pad with the base; and a bent part that is bent from the base at a distance from a wall of the connecting part that faces the disk circumferential surface. a retaining part which is inserted between the wall part and the disk circumferential surface; It is characterized by having a bent part that comes into elastic contact with, and.

(Function) That is, according to the present invention, since the bent portion formed on the tip side of the retaining portion is brought into elastic contact with the connecting lower wall of the carrier, the root portion of the retaining portion is separated from the connecting lower wall of the carrier. Therefore, the base of the pad spring can be reliably brought into close contact with the inner wall of the leg portion of the carrier without causing play in the vertical direction of the pad spring with respect to the carrier.

In addition, since a bent part is formed on the tip side of the retaining part bent from the base of the pad spring, the reaction force received from the carrier's connecting lower wall will not be concentrated at the root of the retaining part. This increases the rigidity of the upper part.

Furthermore, since the bent portion is always in elastic contact with the connecting lower wall of the carrier, the connecting lower wall of the carrier and the retaining portion do not impact against each other.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

First, FIG. 1 is a sectional view showing the main parts of the disc brake according to the present invention, and in the figure, 1 is a carrier fixed to a non-rotating member (not shown) of a vehicle. The carrier 1 has legs 3, 3 spaced apart in the circumferential direction of the disk 2 (A-A' direction in the figure), and each of the legs 3, 3 has an inner wall 4, which faces each other. 4, step portions 5, 5 formed at the inner ends (lower ends in the figure) of the respective inner walls 4, 4 and extending in the axial direction of the disk 2, and the disk 2 of the leg portions 3, 3.
A connecting portion 6 extending in the axial direction of the disk 2, provided at a portion spanning the outer periphery (upper end in the figure) of the disk 2,
6. Each leg portion 3,
A pair of friction pads 8, 8 are slidably supported via pad springs 7, 7, which will be described later, and are attached to the inside of the friction pads 8, 3.
8 is designed to face the disc 2 between them. Bores 9, 9 are bored in the connecting portions 6, 6, and each bore 9, 9 has a caliper support pin 1.
0 and 10 are slidably fitted.
The other end side of the caliper support pins 10, 10 (not shown)
A caliper (not shown) is fixedly held in the caliper, and when one of the friction pads 8 is pressed against the disk 2 by a cylinder mechanism operated by pressure oil installed in the caliper, the reaction force causes The caliper slides under the guidance of the caliper support pins 10, 10 in the direction in which the caliper support pins 10, 10 protrude from the bores 9, 9, thereby causing the other friction pad 8 (as shown) to slide against the disk 2. It is pressed against the vehicle, and braking is performed using this force.

As shown in Fig. 2, the pad spring 7 is
It is generally composed of a base portion 11, a pressing portion 12, and a retaining portion 13. The base 11 includes a pair of legs 11a,
11a, a bridge portion 11b that connects the pair of legs 11a, 11a at one end, and a pair of legs 1
Bent part 11 where the other ends of 1a and 11a are bent
c, 11c, and the pair of legs 11a, 1
1a and the bridge portion 11b are the inner wall 4 of the carrier 1.
The bent portions 11c, 11c are brought into contact with the stepped portion 5. At this time, bridge part 1
1b is designed to straddle disk 2.

Reference numeral 14 denotes a connecting portion, and one end of the connecting portion 14 extends in a curved manner toward the outside of the connecting portion 6 of the carrier 1 from the end opposite to the side where the leg portion 11a of the bridge portion 11b continues; It is formed so that it changes direction midway and extends outward from the friction pad 8, and the other end side extends perpendicularly toward the friction pad 8.
It is said to generate spring force. Pressing part 12
is connected to the other end side of this connecting portion 14,
It is curved in a convex shape relative to the friction pads 8, 8, and is in contact with both friction pads 8, 8 at the same time. That is, the pressing part 12 is a semicircular elongated member, and the friction pads 8, 8 placed on the respective bent parts 11c, 11c are pressed against the carrier 1 from their outer ends by the pressing part 12. It is intended to push towards the As a result, the friction pad 8 is supported so as to be slidable along the sliding portion constituted by the base portion 11 of the pad spring 7 and the bent portion 11c. and,
By sliding the friction pad 8 on this sliding part, the inner wall 4 of the carrier 1 will not be worn out due to the sliding of the friction pad 8, and rust will not occur from this worn part. Protection will be provided.

The retaining portion 13 is located between the leg portions 11a, 11a, and is inserted between the wall portion 6b of the connecting portion 6 facing the disk 2 circumferential surface and the disk 2 circumferential surface, and is inserted between the bridge portion 11b and the disk 2 circumferential surface. The leg portions 11a, 1 of
1a is bent from the continuous side end, and the dimension b' from the base part to the end of the bent part 11c of the base part 11 that contacts the step part 5 is equal to the leg part 3 of the carrier 1. It is set smaller than the dimension a' from the side end (lower end in the figure) continuous with the wall 6b of the inner wall 6a of the connecting part 6 that constitutes a part of the inner wall 4 of the connecting part 6 to the stepped part 5. In other words, the retaining portion 13 has its root portion located at a distance from the wall portion 6b of the connecting portion 6, and the dimensions are determined at the time of manufacture.
Even if there is an error in dimensions a' and b', it is possible to tolerate this error and ensure that the legs 11a, 11a and bridge part 11b of the base 11 are brought into close contact with the inner wall 4 of the leg 3. ing. Further, the wall portion 6b of the connecting portion 6 has a sloped wall 6b1 that slopes downward from the inner side wall 6a, and the retaining portion 13 is formed by bending a portion near its tip toward the sloped wall 6b1. It has a bent portion 13a. The bent portion 13a, which is a part of the retaining portion 13, is in elastic contact with the inclined wall 6b1, and is configured to press the pad spring 7 downward in the figure against the carrier 1. It is assumed that no backlash will occur between the carrier 1 and the carrier 1. Also,
The reaction force that the retaining portion 13 receives from the inclined wall 6b1 is distributed to the bent portion 13a and is not concentrated at the root portion thereof, thereby increasing structural rigidity. Furthermore, the inclined wall 6b is attached to the bent portion 13a.
1, the retaining portion 13 and the inclined wall 6b1 do not collide with each other. Furthermore, as the bent portion 13a comes into elastic contact with the inclined wall 6b1, the pad spring 7 is also biased in the direction of sandwiching the friction pads 8, 8 together with the pad spring 7 on the other side. The friction pads 8, 8 absorb the play in the radial direction of the disk 2, and are positioned with respect to the disk 2 more reliably. Here, the bent portion 13a has a shape that makes surface contact with the inclined wall 6b1 as shown in FIG. 3A, but it has a shape that makes line contact as shown in FIG. 3B, or As shown in FIG. 3C, the retaining portion 13 may be formed to have a curved shape as a whole. The structure shown in FIG. 3B has a simple structure and is easy to manufacture, and the structure shown in FIG.

According to the disc brake configured as described above, the pad spring 7 does not play against the carrier 1, so that no abnormal noise is generated due to vibrations during driving. Furthermore, since the structural rigidity of the retaining portion 13 is improved, the durability of the pad spring 7 as a component of the disc brake is improved. Further, the retaining portion 13 and the inclined wall 6b1
Since the two do not collide with each other, the retaining part 1
Durability is further improved because the impact force of step 3 is not applied.

Furthermore, since the retaining portion 13 has a portion that is not in contact with the connecting portion 6, the contact area of the pad spring 7 with the connecting portion 6 is small, so that the pad spring 7 does not come in contact with the connecting portion 6. The conduction of heat from the friction pads 8 through the caliper pins 7 is reduced, and leakage of the grease coated on the caliper support pins 10 due to melting can be prevented as much as possible.

Note that the caliper support pins 10, 10 may have one end fixed to the carrier 1 and the other end slidably fitted to the caliper.

(Effects of the invention) As described above, according to the invention, in order to ensure that the base is in close contact with the inner wall of the leg, the retaining part is
The connecting part is bent at a distance from the wall facing the disk peripheral surface, and the bent part, which is bent from near the tip toward the wall, is brought into elastic contact with the wall, so that the pad spring and carrier Since there is no play between the two, it is possible to reliably prevent the occurrence of abnormal noise due to vibrations during driving.

Furthermore, since the structural rigidity of the retaining portion is increased, the durability of the pad spring is improved.

Furthermore, since the retaining portion and the connecting lower wall do not collide with each other due to vibration or the like, durability is further improved.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the main parts of the disc brake according to the present invention, Fig. 2 is a perspective view showing the structure of the pad spring shown in Fig. 1, and Fig. 3 A is a cross-sectional view showing the structure of the pad spring shown in Fig. 2. Figure 3 is a cross-sectional view showing the shape, Figure 3 B and C are cross-sectional views showing modifications thereof, Figure 4 is a half cross-sectional view of a conventional disc brake, and Figure 5 shows the structure of the pad spring shown in Figure 4. It is a perspective view. 1...Carrier, 2...Disc, 3...Legs, 4...
Inner wall, 6... Connecting portion, 6b... Wall portion facing the circumferential surface of disk 2, 6b1... Inclined wall, 7... Pad spring, 8... Friction pad, 11... Base, 11c... Bending portion, 12... Pressing portion , 13... Removal prevention part, 13a... Bending part.

Claims (1)

[Claims for Utility Model Registration] A carrier fixed to a non-rotating member of a vehicle on one side of the disk and having a pair of legs spaced apart in the circumferential direction of the disk, and a friction pad disposed on the carrier. a caliper that presses the friction pad toward the disk; and a caliper that extends in the axial direction of the disk on a portion of each pair of legs that straddles the outer periphery of the disk, and that slides between the carrier and the caliper. and a pad spring that presses the friction pad against the carrier and supports the friction pad slidably in the axial direction of the disk, the pad spring being connected to the leg of the carrier. a base that is in close contact with the inner wall of the leg; a pressing portion that extends from the base and presses the friction pad against the carrier; a bending portion constituting the sliding portion of the friction pad; and a bending portion formed by being bent from the base portion at a distance from the wall portion of the connecting portion facing the disk circumferential surface, and a contact portion between the wall portion and the disk circumferential surface. a retaining portion inserted between the retaining portions; and a bent portion constituting a part of the retaining portion and being bent toward the wall from the vicinity of the distal end of the retaining portion, and coming into elastic contact with the wall. A disc brake featuring