JPH051699Y2 - - Google Patents

Description

[Detailed explanation of the idea]

A. Purpose of the invention (1) Industrial application field The present invention relates to a pad for a disc brake, which has a lining fixed to one side of the back metal for slidingly contacting a rotating disc. (2) Prior Art Conventionally, the entire lining of such a disc brake pad is generally made of the same material. (3) Problems to be solved by the invention By the way, the lining of such disc brake pads suffers uneven wear due to the rigidity of the caliper. That is, as shown in FIG. 5, the lining 1
2' wears unevenly. When such uneven wear occurs, the portion 12'a, which has a small amount of wear when not braking, comes into partial contact with the rotating disk 1, and this uneven contact causes the rotating disk 1 to partially wear unevenly. If the rotary disk 1 is partially worn in this way, it causes abnormal vibrations and squeals during braking. Therefore, the present applicant has developed a method of forming at least one of both ends of the lining along the rotation direction of the rotary disk from a material that is less likely to damage the rotary disk compared to the remaining parts, so that the rotary disk can be prevented by one-sided contact of the lining during non-braking. We have already proposed a method that prevents uneven wear. However, when such disc brake pads are used as replacement parts for disc brakes that are already in use, uneven wear may already have occurred on the rotating disc, in which case abnormalities may occur during braking. It is not possible to prevent the occurrence of vibration noise. The present invention was developed in view of the above circumstances, and the surface of the rotating disk is made smooth at the initial stage of installation on the disk brake, thereby ensuring that abnormal vibrations and squeals during braking due to partial wear of the rotating disk are prevented. An object of the present invention is to provide a pad for a disc brake which is designed to prevent such damage. B. Structure of the invention (1) Means for solving the problem According to the invention, the lining includes a first lining portion at at least one of both ends along the rotational direction of the rotary disk, and a first lining portion along the rotational direction of the rotary disk. The second lining part is made of a material that is less likely to damage the rotating disk compared to the material of the second lining part, and the surface of the second lining part is coated with an abrasive material. layers are provided. (2) Effect According to the above configuration, the first lining part is arranged at a position where it tends to come into partial contact with the rotating disc during non-braking, and the second lining part is arranged at a part where it makes strong sliding contact with the rotating disc during braking. By setting the thickness of the abrasive layer to such a level that it can be worn away with a few braking operations, the rotating disk can be pre-polished with the abrasive layer by performing a few braking operations when attached to the disc brake, and the rotating disk The surface of the brake can be made smooth, so even if the first lining part hits the rotating disk unevenly during non-braking, uneven wear of the rotating disk can be prevented and abnormal vibrations and squeals during braking can be prevented. can be prevented. (3) Embodiment Below, an embodiment of the present invention will be explained with reference to the drawings. First, in FIGS. 1 and 2, this disc brake Br is for applying braking force to the wheels of a vehicle. A bracket 2 is attached to the vehicle body (not shown) so as to straddle the rotary disk 1 attached to the wheel, and the bracket 2 is movable within a limited range in a direction parallel to the axis of the rotary disk 1. The caliper 3 is supported by the caliper 3, and the caliper 3 is supported by the caliper 3 on both sides of the rotary disk 1 so as to be in sliding contact with both surfaces of the rotary disk 1.
An inner pad 4 and an outer pad 5 are provided between the pads. The bracket 2 has a pair of mounting holes 6, 6 for attachment to the vehicle body via bolts (not shown), and a bracket main body 2a disposed on one side of the rotary disk 1, and a bracket main body 2a disposed on one side of the rotary disk 1 along the rotational direction of the rotary disk 1. a pair of support arms 2b extending from the upper part of the bracket body 2a and extending from the upper part of the bracket body 2a while being formed in a substantially U-shape so as to straddle the rotary disk 1 at a spaced apart position;
2b. The caliper 3 has a caliper body 3a disposed on one side of the rotary disk 1, and extends from the top of the caliper body 3a toward the other side of the rotary disk 1 at a spaced apart position along the rotational direction of the rotary disk 1. a pair of arm portions 3b, 3b, a connecting portion 3c connecting both arm portions 3b, 3b on the other side of the rotary disk 1, and a pair of caliper claws 3d, 3d hanging downward from both ends of the connecting portion 3c. It consists of The support arm 2 of the bracket 2 is attached to the carrier body 3a in parallel with the axis of the rotary disk 1.
A pair of sliding pins 7, 7 that are slidably fitted in b, 2b are fixed, and the sliding pins 7, 7 enable the caliper 3 to move in the direction along the axis of the rotary disk 1. and is supported by bracket 2. The Calipa body 3a in the Calipa 3 has the following:
A cylinder hole 8 whose closed end is opposite to the rotary disk 1 is bored parallel to the axis of the rotary disk 1, and a hydraulic chamber 9 is defined between the cylinder hole 8 and the closed end. A piston 10 is slidably fitted thereto. Moreover, the piston 10 is formed into a cylindrical shape with a bottom, and is slidably fitted into the cylinder hole 8 with its closed end facing the hydraulic chamber 9 side. Referring to FIGS. 3 and 4, the inner pad 4 and the outer pad 5 are formed by fixing a lining 12 to one surface of a back metal 11. Moreover, the inner pad 4 has a piston 10 on the back of the back metal 11.
The outer pad 5 is arranged between the caliper body 3a and the rotary disk 1 so that the opening end surfaces of the caliper body 3a and the rotary disk 1 are in contact with each other, and the outer pad 5 is placed between the caliper body 3a and the rotary disk 1 so that the caliper claws 3d of the caliper 3 are in contact with the back surface of the back metal 11. It is arranged between both caliper claws 3d, 3d. Further, the shoulder portions 11a, 11a provided at both ends of each back metal 11 are connected to the guide step portions 13, 13 provided on the support arms 2b, 2b of the bracket 2.

[Table] The first lining portion 12a may be made of a material obtained by removing (b) steel fibers and abrasives, such as (i) silica, (j) zirconia, and (k) alumina, from the composition shown in the table above, for example. formed by.
Furthermore, the abrasive material layer 14 is formed of, for example, the abrasive materials listed in the table above. Next, the operation of this embodiment will be explained. During braking, hydraulic pressure is supplied to the hydraulic chamber 9, the inner pad 4 is pressed by the piston 10, and the inner pad 4 is pressed against the rotary disk 1, and the caliper body 1 is moved by the reaction force. The outer pad 5 is pushed by the caliper claws 3d, 3d against the rotary disk 1, and a braking force is obtained by the friction between the linings 12, 12 and the rotary disk 1. Assuming that the inner pad 4 and outer pad 5 are initially installed on the disc brake Br, the surface of the rotary disc 1 is polished by the abrasive layer 14 by performing the braking operation a few times. Therefore, even if the surface of the rotary disk 1 is uneven, the surface of the rotary disk 1 is smoothed. Moreover, the abrasive layer 14 is similar to the lining 12.
Since it is provided on the surface of the second lining part 12b, which is the central part of the brake, surface pressure is concentrated during braking operation.
The abrasive layer 14 is worn away relatively quickly and the surface of the second lining portion 12b is exposed. Further, since the second lining portion 12b is arranged so as to avoid a portion that makes partial contact with the rotary disk 1 during non-braking, the abrasive layer 14 does not come into sliding contact with the rotary disk 1 during non-braking. In the non-braking state after polishing the rotary disk 1 with the abrasive layer 14 in this way, the inner pad 4 and the outer pad 5 tend to drag at one end along the rotational direction of the rotary disk 1. When the amount of wear on the rotary disk 1 becomes large, it causes abnormal vibrations and squeals during braking. However, since the first lining parts 12a, 12a at both ends of the lining 12 along the rotational direction of the rotary disk 1 are formed of a material that does not easily damage the rotary disk 1, the first lining parts 12a, 12a are formed of a material that does not easily damage the rotary disk 1.
Even if the lining parts 12a, 12a hit the rotary disk 1 unevenly, wear of the rotary disk 1 can be suppressed. Moreover, since the surface of the rotary disk 1 is smoothed by the abrasive layer 14 as described above, it is possible to reliably prevent uneven wear of the rotary disk 1 and prevent abnormal vibrations and squeals from occurring during braking. . As another embodiment of the present invention, the second lining portion 12b of the lining 12 is formed of a material having the composition shown in the table above, and the lubricant is (c) graphite, (d) molybdenum disulfide, and (e) trisulfide. The first lining portion 12a may be formed of a material in which the amount of antimony sulfide is increased, for example, by about 1.5 to 2.5 times to make the rotary disk 1 difficult to damage. Furthermore, since only one end of the lining 12 along the rotational direction of the rotary disk 1 tends to contact the rotary disk 1 unevenly when braking is not applied, the first lining portion 12a is provided only at one end of the lining 12, and the central and The remaining part including the other end has a second
A lining portion 12b may be provided,
By doing so, it is possible to suppress a decrease in the frictional force due to the first lining portion 12a. C Effect of the invention As described above, according to the invention, the lining is
A first lining portion of at least one of both ends along the rotational direction of the rotary disk, and a second lining portion of the remaining portion including the central portion along the rotational direction of the rotary disk.
The first lining part is made of a material that is less likely to damage the rotating disk compared to the material of the second lining part, and the abrasive layer is provided on the surface of the second lining part. By keeping the thickness to a level that will wear away after a few braking operations, even if the surface of the rotating disk has unevenness, even if there are irregularities on the surface of the rotating disk, by performing a small number of braking operations at the initial stage of installation on the disc brake. and prevent uneven wear of the rotating disk due to uneven contact of the first lining portion to the rotating disk during non-braking,
It is possible to reliably prevent abnormal vibrations and squeals from occurring during braking.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of the present invention, with Figure 1 being a longitudinal sectional side view of the disc brake, and Figure 2 being a partially cutaway front view seen from the direction of the arrow in Figure 1. , FIG. 3 is a view in the direction of the - arrow in FIG. 1, FIG. 4 is a view in the direction of the arrow in FIG. 3, and FIG. 5 is a plan view showing an exaggerated state of uneven wear of the lining. 1... Rotating disk, 4, 5... Padded, 11
...Secret money, 12...Lining, 12a...1st
Lining part, 12b...Second lining part, 1
4... Abrasive layer, Br... Disc brake.

Claims (1)

[Scope of utility model registration request] In a disc brake pad comprising a lining for sliding contact with a rotary disk fixed to one surface of the back metal, the lining has a first lining portion at at least one of both ends along the rotational direction of the rotary disk, and a first lining portion of the rotary disk. and a second lining part for the remaining part including the center part along the rotation direction, the first lining part is made of a material that is less likely to damage the rotating disk compared to the material of the second lining part, and the surface of the second lining part A disc brake pad characterized in that it is provided with an abrasive layer.