JPH07139566A - Disc brake - Google Patents

Abstract

PURPOSE:To prevent occurrence of rattling noises and errorneous assembling by providing a pad spring which presses a pad in a rotating direction of a disc between an outer side of the pad and a pressing means, and forming a projection and a groove respectively on the spring and the pressing means. CONSTITUTION:A pad spring 47, arranged between an outer side of a pad 3 in a diameter direction of a disc and a connection part 27 of a caliper 24, presses the pad 3 in the rotation direction of the disc. A side surface 17 of the pad 3 is abutted against a side surface 13 of a guide part 12. The pad 3 and the guide part 12 are kept in the state that they have no clearance therebetween in the rotation direction of the disc. When the braking is performed, for instance, by moving the pad 3 in the direction of the disc by means of the caliper 24 and making it in contact with the disc 1, movement of the pad 3 in the rotating direction of the disc is prevented in respect to the guide part 12 which may be caused by the clearance. Thus, generation of rattling noises due to unstable sliding of the pad 3. Since the spring 47 and projections 55, 57 are formed for engagement when the spring 47 is regularly arranged on the caliper 24, erroneous assembling is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake used in a vehicle or the like.

[0002]

2. Description of the Related Art As a disc brake, a fixing member that supports a pad so as to be slidable along the disc axial direction by a guide portion provided on the outlet side in the disc rotation direction, and a disc brake are provided across the pad and the disc. Some of the disc brakes include a pressing means for pressing the pad in the disc direction, and such a disc brake is provided between the outer side of the pad in the disc radial direction and a part of the pressing means facing the pad. , A pad spring for urging the pad inward in the disk radial direction is provided (for example, Japanese Utility Model Laid-Open No. 55-105629).

[0003]

By the way, in the disc brake constructed as described above, normally, between the pad and the guide portion, the pad slightly moves in the direction along the disc rotation direction with respect to the guide portion. However, there is a problem that the pad slides unstably due to this clearance and an unpleasant sound called rattle noise is generated during braking.

Therefore, an object of the present invention is to provide a disc brake capable of preventing the rattle noise from being generated during braking.

[0005]

In order to achieve the above object, in a disc brake according to a first aspect of the present invention, a pad is provided along a disc axial direction by a guide portion provided on the outlet side in the disc rotation direction. A fixing member that slidably supports and a pressing unit that straddles the pad and the disk and presses the pad in the disk direction, the pad being on the outer side in the disk radial direction. A pad spring that presses the pad toward the outlet side in the disc rotation direction is provided between the pad spring and a portion of the pressing means that faces the pad spring. It is characterized in that it is provided with protrusions and grooves that engage each other when arranged.

According to a second aspect of the present invention, there is provided a disc brake, wherein the guide portion provided on the outlet side in the disc rotation direction supports the pad so as to be slidable along the disc axial direction, and the pad. And a pressing means provided across the disk to press the pad in the disk direction, between the outer side of the pad in the disk radial direction and a part of the pressing means facing the outer side. , Comprising a pad spring for pressing the pad toward the outlet side in the disc rotation direction,
The pad spring is provided with a first pressing portion for pressing the pad toward the outlet side in the disc rotation direction on the inlet side in the disc rotation direction, and is further bent toward the inlet side on the outlet side in the disc rotation direction. A second pressing portion is provided which contacts the pad and presses the pad inward in the disk radial direction.

According to a third aspect of the present invention, in addition to the first aspect, the pad spring presses the pad spring toward the inlet side in the disc rotation direction and the pad toward the outlet side in the disc rotation direction. And a second pressing portion that is bent toward the entrance side and abuts against the pad and presses the pad inward in the disk radial direction on the exit side in the disk rotation direction. It is characterized in that a section is provided.

[0008]

According to the disc brake of the first aspect of the present invention, the pad spring provided between the outer side of the pad in the disc radial direction and a part of the pressing means facing the disc brakes the pad. Since the pad is pressed toward the outlet side in the rotation direction, the pad is pressed toward the guide portion provided on the outlet side in the disc rotation direction of the fixed member, and thus the pad is directed in the disc rotation direction with respect to the guide portion. Is prevented from moving to.

Further, the pad spring and the pressing means are
Since the projections and grooves that engage with each other when the pad spring is arranged in the normal state are provided, these projections and grooves do not engage when the pad spring is not arranged in the normal state.

According to the disc brake of the second aspect of the present invention, the pad spring provided between the outer side of the pad in the radial direction of the disc and a part of the pressing means facing the disc brakes the pad. Since the pad is pressed toward the outlet side in the rotation direction, the pad is pressed toward the guide portion provided on the outlet side in the disc rotation direction of the fixed member, and thus the pad is directed in the disc rotation direction with respect to the guide portion. Is prevented from moving to.

Further, the pad spring is provided with a first pressing portion for pressing the pad toward the outlet side in the disc rotation direction on the inlet side in the disc rotation direction, and further, the inlet side on the outlet side in the disc rotation direction. There is provided a second pressing portion that is bent toward and contacts the pad and presses the pad inward in the disk radial direction. In this way, the second pressing portion is directed toward the inlet side. Since it has a bent shape, the portion that presses the pad inward in the radial direction of the disk becomes compact while ensuring an appropriate pressing force.

According to the disc brake of claim 3 of the present invention, in addition to the disc brake of claim 1, the pad spring presses the pad toward the inlet side in the disc rotation direction and toward the outlet side in the disc rotation direction. A second pressing part is provided with a first pressing part, and is further bent toward the entrance side on the outlet side in the disc rotation direction and abuts against the pad to press the pad inward in the disc radial direction. Since the second pressing portion has a shape that is bent toward the inlet side in this way, the pad is pressed inward in the disk radial direction while ensuring an appropriate pressing force. The part pressed to the side becomes compact.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A disc brake according to an embodiment of the present invention will be described below with reference to the drawings. The disc rotation direction in the following description is the disc rotation direction when the vehicle is moving forward. 1 to 3, reference numeral 1 denotes a disk that rotates together with a wheel, and reference numeral 2 denotes a carrier that is a fixing member that is arranged on one side of the disk 1 and that is fixed to a non-rotating mounting portion of the vehicle (not shown). There is. Figure 2
As shown in FIG. 1, the first pad 3 is arranged to face one surface of the disk 1, and the second pad 4 is arranged to face the other surface.

The carrier 2 has a long side portion 6 substantially along the inner side (the lower side in FIG. 1) of the first pad 3 in the disk radial direction.
And a short side portion 7 that is substantially along the outlet side of the first pad 3 in the disc rotation direction (direction indicated by arrow X in FIG. 1) and has a substantially L shape. The short side portion 7 of the carrier 2 is provided with a main pin hole 8 at an end portion (upper end portion in FIG. 1) outward of the first pad 3 in the radial direction of the disc by a predetermined amount. As shown in FIG. 2, one end of the disk 8 projects outside the outer periphery of the disk 1 and the other end of the disk 1 is parallel to the disk axis direction.
The main pin 9 projecting in the opposite direction is fixed at a predetermined intermediate position in the axial direction. Further, on the inner side of the main pin hole 8 in the disk radial direction, there is provided a first mounting hole 11 through which a bolt or the like for mounting on a mounting portion (not shown) is inserted.

In addition, on the inner side in the disk radial direction of the short side portion 7 with respect to the main pin hole 8 and on the first pad 3 side,
A guide portion 12 is formed so as to project toward the outlet side of the first pad 3 in the disc rotation direction. Here, the guide portion 12 abuts and receives the torque generated in the first pad 3 by the contact with the disc 1 when the vehicle moves forward, and slides the first pad 3 in the disc axial direction. To guide you.

Here, in this embodiment, the guide portion 12
Extends in the disc direction (the depth direction of the paper surface in FIG. 1) to guide the sliding of the first pad 3 in the disc axial direction, and the side surface portion 13 on the first pad 3 side along the vertical direction in FIG. An outer surface portion 14 provided perpendicularly to the side surface portion 13 along the disk axial direction is provided on the outer side in the disk radial direction from the side surface portion 13. The guide portion 12
A guide member 15 that is bent and formed along the side surface portion 13 and the outer surface portion 14 is provided on the. Further, in the first pad 3, the protrusion 16 is formed to project at a position on the disk radial direction outer side of the side surface portion 17 on the outlet side in the disk rotation direction, and the side surface portion 17 and the inner surface 16 a of the projection portion 16 are The guide member 1 is brought into contact with the guide member 1 and
It is supported by the guide portion 12 via the guide member 5.

A guide pin hole 18 is provided in the long side portion 6 of the carrier 2 on the inlet side in the disc rotation direction so as to be parallel to the disc axial direction, and the guide pin hole 18 is provided in the disc axial direction. A slide guide pin 19 having the same diameter as the main pin 9 is fixed so as to be parallel and project in the opposite direction to the disc. Further, the long side portion 6 is provided with a mounting second hole portion 20 through which a bolt or the like for mounting a mounting portion (not shown) is inserted at a predetermined intermediate position.

A backward torque receiving portion 21 is formed on the outer side of the guide pin hole 18 substantially in the radial direction of the disk. As shown in FIG. 1, the reverse side torque receiving portion 21 projects in the disc direction (the depth direction of the paper surface in FIG. 1) so that the side face portion 22 on the outlet side in the disc rotation direction is aligned with the disc axial direction. Facing the portion 22, the first pad 3
A protrusion 23 is formed on the inner side of the disk in the radial direction of the disk. Here, the reverse side torque receiving portion 21 receives the torque generated in the first pad 3 due to the contact with the disk 1 when the vehicle is moving in reverse by abutting the first pad 3.

As shown in FIG. 2, the first pad 3 and the second pad 4 are provided on the slide guide pin 19 and one end of the main pin 9 of the carrier 2 opposite to the disc 1. A caliper 24, which is a pressing means for pressing in the direction, is slidably supported. This caliper 24
Is opposite to the disk 1 of the second pad 4 and the cylinder portion 25 on the opposite side of the disk 1 of the carrier 2 and slidably fitted to the one end side of the main pin 9 and the slide guide pin 19. Claw portion (reaction portion) 26 extending along the side
And a connecting portion 27 that connects the cylinder portion 25 and the claw portion 26 across the outer side of the disk 1 in the radial direction.

The cylinder portion 25 and the claw portion 2 of the caliper 24
6, a support pin 28, which is parallel to the disc axial direction, is provided on the inlet side in the disc rotation direction so as to straddle the outer periphery of the disc 1. The second pad 4 is inserted into guide holes 30 and 31 provided in the disk rotation direction inlet side and the disk radial direction outer side substantially in the disk rotation direction. The disc rotation inlet side of the pad 3 and the second pad 4 is slidable along the disc axial direction.

As described above, the outlet side of the first pad 3 in the disc rotation direction is the inner surface 16a of the protrusion 16 thereof.
And the side surface portion 17 has the guide portion 1 via the guide member 15.
It is slidable along the disc axial direction by being guided by 2. Further, as shown in FIG. 3, the second pad 4 has a guide hole 32 on the outlet side in the disc rotation direction (the direction indicated by the arrow Y in FIG. 3) and on the disc radial outer side. The hole 32 is inserted into the other end side of the main pin 9 so that the disc rotation outlet side is slidable along the disc axial direction.

A piston (not shown) which projects toward the claw 26 by the brake fluid pressure is fitted into the cylinder portion 25, and the caliper 2 is projected by the projection of this piston.
The reference numeral 4 holds the first pad 3 and the second pad 4 against the respective discs 1 from the opposite side while sliding on the carrier 2 and presses them in the disc direction.
It is designed to come into contact with.

Here, the guide member 15 is made of heat-resistant stainless steel or the like to make the first pad 3 slide smoothly, and to make a dent on the carrier 2 by the vibration or braking torque of the first pad 3. It is provided for the purpose of preventing the occurrence of rust and the like, and further preventing the carrier 2 and the first pad 3 from being fixed due to rust.

The guide member 15 has a main plate portion 35 along the side surface portion 13 of the guide portion 12 and an outer plate portion 36 along the outer surface portion 14, and the outer plate portion 36 is opposite to the disc 1. At the side end, the protrusion 16 of the first pad 3 protrudes outward in the radial direction of the disc along the opposite side of the disc 1 with respect to the disc 1, and prevents the first pad 3 from falling off from the cylinder portion 25 side. A locking piece portion 38 is provided.

In the present embodiment, the connecting portion 27 of the caliper 24 is provided on the outer surface of the first pad 3 in the radial direction of the disk.
Protruding portions 40 and 41 that project outward in the radial direction of the disc in a substantially semicircular shape are provided at a substantially central position in the disc rotation direction and a predetermined position on the inlet side in a range covered by. Although not shown, the connecting portion 2 of the caliper 24 is also provided on the outer surface of the second pad 4 in the radial direction of the disk.
A projecting portion that projects in a substantially semicircular shape outward in the disk radial direction is provided at a substantially central position in the disk rotation direction and a predetermined position on the entrance side in the range covered by 7.

Here, a concave portion 44 is formed on the inner surface side of the connecting portion 27 of the caliper 24, and the bottom surface 45 of the concave portion 44 is substantially along the outer surface of the first pad 3 in the radial direction of the disk. There is. A pad spring 47 shown in FIGS. 4 to 6 is provided between the protruding portions 40, 41 and the like and the inner surface of the connecting portion 27 facing the protruding portions 40 and 41 in a state of being housed in the recess 44. . This pad spring 47 is
It has a flat plate-shaped substrate portion 48 along the bottom surface 45 of the recess 44, and both end portions of the substrate portion 48 in the disc axial direction (vertical direction in FIG. 4) have a disc rotation direction (horizontal direction in FIG. 4). A pair of locking piece portions 49 and 50 that bend inward in the radial direction of the disc (backward in the plane of FIG. 4) are provided at substantially intermediate positions.

The pad spring 47 has a first arm portion 51 extending from an end portion of the base portion 48 on the cylinder portion 25 side (lower side in FIG. 4) toward an inlet side (right side in FIG. 4) in the disc rotation direction. And the outlet side in the disk rotation direction from the end of the base portion 48 on the cylinder portion 25 side (left side in FIG. 4).
The second arm portion 52 extending toward and the claw portion 2 of the substrate portion 48.
The third arm 53 extending from the end on the 6 side (the upper side in FIG. 4) toward the entrance side in the disc rotation direction, and from the end on the claw portion 26 side of the base plate 48 toward the exit side in the disc rotation direction. An extending fourth arm portion 54 is provided. Here, the 1st arm part 51 and the 3rd arm part 53 each comprise the 1st press part, and the 2nd arm part 52 and the 4th arm part 54 respectively comprise the 2nd press part. .

The first arm portion 51 and the third arm portion 53 extend a predetermined amount from the base plate portion 48 toward the entrance side in the substantially disk rotation direction, and as shown in FIG. Is slightly inclined inward in the disk radial direction (downward in FIG. 5) so as to form an obtuse angle. The respective tip portions 51a and 53a are inclined inward in the disc radial direction at a larger angle.

The second arm portion 52 and the fourth arm portion 54
Is a semi-circular shape that extends from the base plate portion 48 toward the disc rotation direction outlet side in the same plane as the base plate portion 48, and then inward in the disc radial direction toward the disc rotation direction inlet side. Further, the tip end side is extended by a predetermined amount toward the entrance side in the disc rotation direction, and is inclined such that the tip end side is slightly closer to the substrate portion 48. And the second arm 52
And extension-side tip portions 52a of the fourth arm portions 54,
54a is inclined so as to be slightly separated from the substrate portion 48 as it goes toward the tip side. Further, the substrate portion 48
On the side of the second arm portion 52 and the fourth arm portion 54, a protrusion 55 that bends and extends outward in the disk radial direction is provided between the second arm portion 52 and the fourth arm portion 54. There is.

Then, the pad spring 47 is housed in the recess 44 with the substrate portion 48 abutting on the bottom surface 45. Then, in this stored state, the pad spring 47 has the locking piece portions 49 and 50 in the recess 44.
The inner surface of the claw portion 26 side and the inner surface of the cylinder portion 25 side are brought into contact with each other to perform positioning in the disc axial direction.

The pad spring 47 is positioned in the disc axial direction by the locking pieces 49 and 50, and the second arm 52 and the fourth arm are formed on the side face 56 of the recess 44 on the outlet side in the disc rotation direction. The state where the parts 54 are brought close to each other and the caliper 24 is attached (the state shown in FIG. 1)
At this time, the tip end portion 51a of the first arm portion 51 is brought into contact with the inlet side protrusion portion 41 of the first pad 3, and the tip end portion 52a of the second arm portion 52 is brought into contact with the center side protrusion portion 40 of the first pad 3. The tip end portion 53a of the third arm portion 53 is brought into contact with an unillustrated inlet side protrusion of the second pad 4, and the tip end portion 5 of the fourth arm portion 54 is contacted.
When the 4a is arranged at a regular position where it abuts against a central projection (not shown) of the second pad 4, a groove 57 for locating the projection 55 therein is formed in the disk rotation direction from the central position of the bottom surface 45 of the recess 44. The pad spring 47 is formed at a predetermined position on the outlet side in a range corresponding to the allowable range of positional displacement of the pad spring 47.

Here, when the caliper 24 is attached in the state in which the caliper 24 is placed in the regular position, the first arm 51 has the protrusion 41 of the first pad 3 so that the tip 51a side is close to the bottom surface 45 of the recess 44. The second arm 52 is pressed by the protruding portion 40 of the first pad 3 so that the tip 52a side of the second arm 52 approaches the substrate portion 48, and the tip 53a of the third arm 53 approaches the bottom surface 45 of the recess 44. As a result, the second pad 4 is pressed by the not-shown inlet-side protruding portion, and the fourth arm portion 54 is pressed by the not-shown central-side protruding portion of the second pad 4 so that the tip end 54a side is close to the substrate portion 48. Will be.

As a result, the first arm portion 51 and the second arm portion 5
2, the third arm portion 53 and the fourth arm portion 54 bend to generate a pressing force. In this state,
As shown in only one side, the first arm portion 51 and the third arm portion 5
No. 3 maintains an obtuse angle with respect to the base plate portion 48, and the tip portions 51a and 53a of each of them 3 abut on the protrusion 41 or the like obliquely from the disk rotation direction inlet side on the disk radial direction outer side. become. Further, the second arm portion 52 and the fourth arm portion 54 have their respective tip portions 52a and 54a substantially parallel to the substrate portion 48, and come into contact with the protrusion 40 and the like from the disk radial direction outer side.

In this way, the first pad 3 and the second pad 4 are pressed inward in the disk radial direction by the urging force of the second arm portion 52 and the fourth arm portion 54, and the first arm portion 5 is moved.
The urging force of the first arm portion 53 and the third arm portion 53 pushes the disc inward in the disc radial direction, which is inclined toward the outlet side in the disc rotation direction. The first pad 3 and the second pad 4 are pressed toward the disc rotation direction outlet side by the component of the pressing force of the first arm portion 51 and the third arm portion 53 in the direction toward the disc rotation direction outlet side. become. Here, the pressing force of the pad spring 47 toward the inner side in the disk radial direction,
The first pad 3 maintains the state in which the inner surface 16a of the protrusion 16 is in contact with the outer surface portion 14 of the guide portion 12 via the guide member 15, so that the support pin 28 of the first pad 3 is centered. Such swinging is prevented as in the conventional case. Further, the first arm portion 5 of the tip end portion 53a of the third arm portion 53
On the 1 side, a locking piece portion 5 protruding inward in the disk radial direction
3b has a locking piece portion 54b protruding inward in the disc radial direction on the second arm portion 52 side of the tip end portion 54a of the fourth arm portion 54.
However, these prevent the second pad 4 from falling off from the third arm portion 53 and the fourth arm portion 54.

According to the disc brake having such a configuration, as described above, the first pad 3 and the second pad 4 are used.
The pad spring 47 provided between the outer side in the disk radial direction and the connecting portion 27 of the caliper 24 facing the disk spring is a component of the pressing force of the first arm portion 51 along the disk rotation direction outlet side, Since the first pad 3 is pressed toward the outlet side in the disc rotation direction, the first pad 3
Is pressed in the direction of the guide portion 12 provided on the outlet side of the caliper 24 in the disc rotation direction so that the side surface portion 17 contacts the side surface portion 13 of the guide portion 12 via the guide member 15. Therefore, the first pad 3
There is always no clearance between the guide portion 12 and the guide portion 12 in the direction of disk rotation.

Therefore, the brake fluid pressure causes the caliper 24 to hold the first pad 3 and the second pad 4 from the opposite sides of the respective discs 1 and move them in the disc direction to bring them into contact with the disc 1. Sometimes
Since the first pad 3 is prevented from moving in the direction along the disc rotation direction with respect to the guide portion 12 due to the clearance, the rattle that occurs without the sliding of the first pad 3 being stable. It is possible to prevent generation of an unpleasant sound called a sound.

The same applies to the second pad 4 supported by inserting the guide hole 32 into the main pin 9 (the clearance of the second pad 4 is
It is the clearance between the main pin 9 and the guide hole 32).
That is, the pad spring 47 presses the second pad 4 toward the outlet side in the disc rotation direction by the component of the pressing force of the third arm portion 53 along the outlet side in the disc rotation direction. , The guide hole 32 is pressed toward the main pin 9 which is a guide portion provided on the outlet side of the caliper 24 in the disc rotation direction so that the guide hole 32 abuts the main pin 9 particularly strongly. The pad 4 is prevented from moving with respect to the guide portion 12 in the direction along the disc rotation direction. Therefore,
It is possible to prevent the generation of an unpleasant sound called rattle sound that occurs when the second pad 4 slides in an unstable manner.

Also, the pad spring 47 and the caliper 2
4 is provided with a protrusion 55 and a groove 57 that engage with each other only when the pad spring 47 is arranged in the regular position, so that the protrusion 55 and the groove 57 are arranged when the pad spring 47 is not arranged in the regular state. Will not engage. Therefore, for example, the pad spring 47 comes out of the caliper 24 and the caliper 2
With a simple structure, it is possible to prevent the pad spring 47 from being erroneously assembled, such as the state where the assembly of No. 4 cannot be performed. Although the pad spring 47 is provided with the projection 55 and the caliper 24 is provided with the groove 57 in the present embodiment, the pad spring 47 may be provided with the groove and the caliper 24 is provided with the projection. However, the configuration of the present embodiment has a thin pad spring 4
7 is preferable, because the depth of the groove can be increased and the height of the protrusion can be increased, and the groove and the protrusion can be easily formed.

The pad spring 47 has a first arm portion 51 and a third arm portion 53 which press the first pad 3 and the second pad 4 toward the outlet side in the disc rotation direction on the inlet side in the disc rotation direction. Provided, in addition,
On the exit side in the disc rotation direction, the first pad 3 and the second pad 4 are bent toward the entrance side and abut against the first pad 3 and the second pad 4 to press the first pad 3 and the second pad 4 inward in the disc radial direction. A two-arm part 52 and a fourth arm part 54 are provided.

As described above, since the second arm portion 52 and the fourth arm portion 54 have a shape bent toward the entrance side in the disc rotation direction, an appropriate pressing force is secured and spring stress is prevented from becoming excessive. The reliability of the first pad 3 and the second pad 4 can be made compact by pressing the first pad 3 and the second pad 4 inward in the radial direction of the disk. Therefore, the caliper 24 can be downsized, and
Since the space for accommodating the pad spring 47 becomes small, the rigidity of the caliper 24 can be made extremely high.

In the present embodiment, the first pad 3
The protrusions 40, 41 and the like are provided on the second pad 4 and the protrusions 40, 41 and the like are pressed by the pad spring 47. It is also possible to directly press the outer surface of the two pads in the radial direction of the disk. In this case, it is possible to provide a protruding portion that is convex on the contact side at the contact portion of the pad spring with the first pad and the second pad.

Also, the shape of the carrier is not limited to the above, and for example, the long side portion of the first pad which extends substantially inward in the disc radial direction and the exit side of the first pad in the disc rotation direction are provided. It has a substantially U-shape consisting of a short side portion and a short side portion substantially along the inlet side of the first pad in the disc rotation direction. The both short sides face both ends of the first pad in the disc rotation direction. The present invention can also be applied to those in which the guide portions are formed so as to project from each other. Also in this case,
As the pad spring, the same one as in the above embodiment, which presses the pad toward the guide portion on the outlet side in the disc rotation direction, can be applied.

[0043]

As described in detail above, the first aspect of the present invention
According to the described disc brake, the pad spring, which is provided between the outer side of the pad in the disc radial direction and a part of the pressing means facing the pad, pushes the pad toward the outlet side in the disc rotation direction. Therefore, the pad is pressed toward the guide portion provided on the outlet side of the fixing member in the disc rotation direction, and thus the pad is prevented from moving in the direction along the disc rotation direction with respect to the guide portion. To be done. Therefore, it is possible to prevent the generation of an unpleasant sound called rattle sound which occurs when the sliding of the pad is not stable.

Further, in the pad spring and the pressing means,
Since the projections and grooves that engage with each other when the pad spring is arranged in the normal state are provided, these projections and grooves do not engage when the pad spring is not arranged in the normal state. Therefore, erroneous assembly of the pad spring can be prevented with a simple structure.

According to the disc brake of the second aspect of the present invention, the pad spring provided between the outer side of the pad in the disc radial direction and a part of the pressing means facing the outer side of the pad acts on the pad. Since the pad is pressed toward the outlet side in the disc rotation direction, the pad is pressed toward the guide portion provided on the outlet side in the disc rotation direction of the fixing member, and thus the pad is along the disc rotation direction with respect to the guide portion. It is prevented from moving in the direction. Therefore, it is possible to prevent the generation of an unpleasant sound called rattle sound which occurs when the sliding of the pad is not stable.

Further, the pad spring is provided with a first pressing portion for pressing the pad toward the outlet side in the disc rotation direction on the inlet side in the disc rotation direction, and further, the inlet side on the outlet side in the disc rotation direction. There is provided a second pressing portion that is bent toward and contacts the pad and presses the pad inward in the disk radial direction. In this way, the second pressing portion is directed toward the inlet side. Since it has a bent shape, the portion that presses the pad inward in the disk radial direction while ensuring an appropriate pressing force becomes compact. Therefore, the caliper can be downsized, and the space for accommodating the pad spring can be reduced, so that the caliper rigidity can be made extremely high.

According to the disc brake of claim 3 of the present invention, in addition to the disc brake of claim 1, the pad spring presses the pad toward the inlet side in the disc rotation direction and the pad toward the outlet side in the disc rotation direction. A second pressing part is provided with a first pressing part, and is further bent toward the entrance side on the outlet side in the disc rotation direction and abuts against the pad to press the pad inward in the disc radial direction. Since the second pressing portion has a shape bent toward the entrance side in this manner, the pad is secured to the inner side in the radial direction of the disk while ensuring an appropriate pressing force. The part pressed against is compact. Therefore, the caliper can be downsized, and the space for accommodating the pad spring can be reduced, so that the caliper rigidity can be made extremely high.

[Brief description of drawings]

FIG. 1 is a partially cutaway schematic view showing a disc brake according to an embodiment of the present invention as viewed from the direction A in FIG.

FIG. 2 is a plan view showing a disc brake according to an exemplary embodiment of the present invention.

FIG. 3 is a schematic view showing a disc brake according to an exemplary embodiment of the present invention as viewed from the direction B in FIG.

FIG. 4 is a plan view showing the pad guide of the disc brake according to the embodiment of the present invention, viewed from the same direction as FIG.

5 is a view showing the pad guide of the disc brake according to the embodiment of the present invention, as viewed from the direction C in FIG. 4. FIG.

6 is a view showing the pad guide of the disc brake according to the embodiment of the present invention, as viewed from the direction D in FIG.

[Explanation of symbols]

 1 Disc 2 Carrier (Fixing Member) 3 First Pad 4 Second Pad 12 Guide Part 24 Caliper 47 Pad Spring 51 First Arm Part (First Pressing Part) 52 Second Arm Part (Second Pressing Part) 53 Three-arm part (first pressing part) 54 Fourth arm part (second pressing part) 55 Protrusion 57 Groove

Claims (3)

[Claims] 1. A fixing member that supports a pad so as to be slidable along the disc axial direction by a guide portion provided on the outlet side in the disc rotation direction, and the pad provided across the pad and the disc. In a disc brake having a pushing means for pushing in the disc direction, the pad is directed to an outlet side in the disc rotating direction between an outer side of the pad in the disc radial direction and a part of the pushing means facing the pad. A disc brake comprising a pad spring for pressing, and the pad spring and the pressing means are provided with protrusions and grooves which engage with each other when the pad spring is placed in a normal state. 2. A fixing member for supporting a pad so as to be slidable along the disc axial direction by a guide portion provided on the outlet side in the disc rotating direction, and the pad provided across the pad and the disc. In a disc brake having a pushing means for pushing in the disc direction, the pad is directed to an outlet side in the disc rotating direction between an outer side of the pad in the disc radial direction and a part of the pushing means facing the pad. A pad spring for pressing is provided, and the pad spring is provided with a first pressing portion for pressing the pad toward an outlet side in the disc rotation direction on an inlet side in the disc rotation direction, and further, an outlet in the disc rotation direction. Side, the pad is bent toward the entrance side and abuts against the pad Disc brakes, wherein the second pressing portion for pressing the inner side is provided in the. 3. The pad spring is provided with a first pressing portion for pressing the pad toward an outlet side in the disc rotation direction on the inlet side in the disc rotation direction, and further, an inlet side on the outlet side in the disc rotation direction. 2. The disc brake according to claim 1, further comprising a second pressing portion that is bent toward the side to contact the pad and press the pad inward in the disk radial direction.