JP2865915B2 - Disc brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk brake used for a vehicle or the like, and more particularly to a disk brake having a structure in which an outer pad and a caliper are held in close contact with a retainer spring.

[0002]

2. Description of the Related Art FIG.
And the structure shown in FIG. In this disc brake, an inner pad 2 and an outer pad 3 are arranged at positions facing each other with the disc 1 interposed therebetween, and a cylinder 4 for driving the inner pad 2 and two claw portions 5 for supporting a back portion 3a of the outer pad 3 are provided. And a caliper 6 having the following. Two fitting projections 7 are provided on the back 3 a of the outer pad 3, and are fitted between the two claws 5 of the caliper 6. Said 2
The two fitting projections 7 are used to hold the two claw portions 5 during braking operation.
The torque is transmitted to the caliper 6 by being pressed by the torque receiving surfaces 8 formed on the opposing surfaces of the disk 1, respectively.

[0003] A retainer spring 9 for attaching the claw 5 of the caliper 6 to the outer pad 3 is attached to the back 3 a of the outer pad 3. The retainer spring 9 is formed by pressing a leaf spring to form a fixed portion 9 a that is locked between the two fitting projections 7 of the outer pad 3.
And a pair of arm portions 9b abutting against the back surface 5a of the two claw portions 5 of the caliper 6. The retainer spring 9 holds the outer pad 3 and the claw 5 in close contact with each other by sandwiching the claw 5 of the caliper 6 between the arm 9b and the back 3a of the outer pad 3.

[0004]

The outer pad 3 is attached to the caliper 6 by a retainer spring 9.
Is fixed between the two fitting projections 7 of the outer pad 3, and the arm 9b of the retainer spring 9 is elastically deformed to increase the distance between the outer pad 3 and the arm 9b. Insert the claw 5 of the caliper 6,
This is performed by fitting the fitting projection 7 between the two claw portions 5. However, the outer pad 3 and the arm 9b
When the claw part 5 of the caliper 6 is inserted between the claw part 5, the fitting convex part 7 must go over the claw part 5, and the distance between the arm part 9 b of the retainer spring 9 and the outer pad 3 is Thus, the width can be expanded to the sum of the thickness and the thickness of the fitting projection 7. This space may be further widened so that the claw portion 5 does not come into contact with the fitting convex portion 7 and the arm portion 9b during insertion. In this case, excessive stress is generated in the retainer spring 9. As a result, the spring force may be reduced.

[0005] The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a retainer spring 9 when the outer pad 3 is mounted on the caliper 6.
An object of the present invention is to provide a disc brake with reduced stress generated in the disc brake.

[0006]

In order to achieve the above object, according to the present invention, there are provided an outer pad and an inner pad provided at positions opposing each other with a disk interposed therebetween, and a direction in which these pads are brought close to the disk together. And a caliper for supporting the outer pad in close contact with the back of the outer pad, and the back of the outer pad is fitted with the claw to rotate the disc. A fitting projection for transmitting torque to the caliper, and a spring engaging projection projecting at an intermediate position between the two claws when mounted on the caliper are provided, and the spring engaging projection is elastically deformable. A retainer spring is rotatably engaged with the retainer spring. An arm portion extending in both directions with the center as a center, and a pressing portion which is located at a tip of the arm portion and sandwiches the claw portion between the outer pad and the arm portion, is provided, and the claw portion is pressed by the pressing portion. A spring contact surface is provided, and between the two claw portions, a height from a surface that closely contacts the outer pad is lower than the spring contact surface, and a recess capable of disposing a pressing portion of the retainer spring has a concave portion of the retainer spring. It is characterized by being arranged alongside the spring contact surface in the rotation direction.

[0007]

In the disc brake of the present invention, when the engaging portion provided on the retainer spring is engaged with the spring retaining projection provided on the back of the outer pad, the retainer spring is rotatably attached to the spring retaining projection. . When the arm portion of the retainer spring is aligned with the position of the concave portion provided on the caliper and the outer pad is moved to the fitting position to the caliper, the height of the bottom of the concave portion from the surface where the outer pad is in close contact is lower than the spring contact surface. The retainer spring is inserted into the recess in a free state or in a state of being slightly elastically deformed. Then, the retainer spring is rotated around the spring locking projection in a state where the fitting convex portion of the outer pad is fitted between the claw portions of the caliper and the back portion of the outer pad is brought into close contact with the claw portion,
By aligning the pressing portion at the tip of the arm portion with the position of the spring contact surface provided on the claw portion, the claw portion is sandwiched between the pressing portion and the back of the outer pad, and the outer pad is mounted on the caliper. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A disc brake according to one embodiment of the present invention will be described below with reference to the drawings shown in FIGS.
In this embodiment, the same reference numerals are given to portions having the same configuration as the related art, and the description will be simplified. The disc brake of this embodiment is different from that shown in the prior art in that the outer pad 11 is
Of the retainer spring 13 and its peripheral portion.

In the disc brake according to the present embodiment, as shown in FIG. 3, two fan-shaped fitting projections 7 and a spring engaging part are provided on the back part 11a of the outer pad 11 supported by the claw part 14 of the caliper 12. A stop projection 15 is provided. The spring engagement projection 15 is disposed at an intermediate position between the two fitting projections 7, and as shown in FIG. 5, a rod-shaped engagement shaft 1 protruding from the back 11 a of the outer pad 11.
6 and a locking flange 17 having a larger diameter than the engaging shaft 16 at the tip of the engaging shaft 16, and is fixed to the back 11 a of the outer pad 11 by a fastening means such as a screw-in type.

A retainer spring 13 is mounted on the spring engaging projection 15. The retainer spring 13 is formed by bending a wire rod such as spring steel, and has a spring engaging projection 15 at the center thereof.
An engaging portion 18 that penetrates the engaging shaft 16 is provided.
As shown in FIG. 6, the engaging portion 18 has an arc portion 18a formed to have an inner diameter larger than the diameter of the engaging shaft 16 and smaller than the diameter of the locking flange portion 17, and an arc portion 18a
And an engagement port 18b formed by narrowing both ends of the engagement shaft 18 so as to have a gap smaller than the diameter of the engagement shaft 16. The engagement port 18b of the retainer spring 13 thus formed
By inserting the engaging shaft 16 of the spring locking projection 15 while elastically deforming and expanding the spring, the retainer spring 13 is attached to the spring locking projection 15 so as not to fall off and to be rotatable.

Further, the retainer spring 13 includes:
Two arms 19 are formed by the wire having the engagement opening 18b extending in both directions from the engagement opening 18b. As shown in FIG. 4, both ends of the wire portion extending in the plane on which the arc portion 18a is formed are bent once in a plane orthogonal to the plane, and the ends are respectively It has a shape that is bent again in a plane substantially parallel to the plane of the arc portion 18a. And the arm 19
A pressing portion 19a that sandwiches the claw portion 14 of the caliper 12 between the caliper 12 and the outer pad 11 is formed at the tip of the wire by bending the wire into a U-shape.

On the other hand, the two claws 14 of the caliper 12
The spring contact surface 2 against which the pressing portion 19a contacts
0 is provided, and a concave portion 21 is formed in the caliper 12 at an intermediate position between the two claw portions 14 so as to be recessed in the direction of the disk 1 from the spring contact surface 20.
The concave portion 21 is located at a position just rotated by 90 ° around the spring engaging protrusion 15 by a straight line connecting the two spring contact surfaces 20 and the spring engaging protrusion 15, and is located at the bottom 21 a of the concave portion 21. The sum of the thickness of the caliper 12 and the height of the fitting projection 7 of the outer pad 11 is formed to be smaller than the width from the engaging portion 18 of the retainer spring 13 to the pressing portion 19a.

In order to mount the outer pad 11 on the claw portion 14 of the caliper 12 in the disk brake constructed as described above, first, as shown in FIG. 1, the retainer spring 13 on the back portion 11a of the outer pad 11 is engaged with the spring. It rotates around the projection 15 and one of the caliper 1
2 so as to be arranged in the concave portion 21.
At this time, the concave portion 21 of the caliper 12 and the fitting convex portion 7 of the outer pad 11 are sandwiched between the engaging portion 18 of the retainer spring 13 and the pressing portion 19a, but from the engaging portion 18 to the pressing portion 19a. Is larger than the total thickness of the caliper 12 and the fitting projection 7 in the concave portion 21, so that the retainer spring 13 is in a free state in which no external force is applied.
Then, in this state, when the fitting projection 7 of the outer pad 11 is fitted between the two claw portions 14 of the caliper 12, FIG.
As shown in the figure, the back portion 11a of the outer pad 11 and the claw portion 14 of the caliper 12 are in close contact with each other. Next, the retainer spring 13 is elastically deformed to widen the space between the pressing portion 19a and the outer pad 11, and is rotated by 90 ° around the spring locking projection 15 (counterclockwise in FIG. 3) to thereby press the pressing portion 19a. Are arranged on the spring contact surface 20 of the claw portion 14, and the claw portion 14 is sandwiched between the pressing portion 19 a of the retainer spring 13 and the outer pad 11, so that the claw portion 14 and the outer pad 11 are held in close contact with each other. .

At this time, the retainer spring 13 only needs to be deformed by the amount of riding on the rear surface 14a of the claw portion 14 from the concave portion 21 of the caliper 12, and the amount of deformation needs to generate a force for pressing the outer pad 11 against the claw portion 14. Since it has the least amount of deformation, it is designed within the elastic range. Therefore, according to the disk brake of the present embodiment, the outer pad 11 can be mounted on the caliper 12 without reducing the spring force of the retainer spring 13.
In addition, just by rotating the retainer spring 13,
Since the outer pad 11 can be attached to and detached from the caliper 12, there is an advantage that a tool is not required at the time of attachment and detachment, and maintainability is improved.

The concave portion 21 of the caliper 12 and the claw portion 14
When the inclined surface is provided at the boundary with the
The retainer spring 13 is gradually elastically deformed simply by rotating the retainer spring 13 around the spring locking projection 15, so that the mounting of the outer pad 11 to the caliper 12 is further simplified.

Further, as shown in FIG. 7, the spring contact surface 22 is inclined toward the center of the disk 1, that is, toward the tip of the claw portion 14 so as to approach the disk 1 surface. When the pressing portion 23 of the retainer spring 13 is also inclined so as to be in close contact with the spring contact surface 22, the outer pad 11 is urged in the radial direction of the disk 1, whereby the fitting projection 7 of the outer pad 11 and the claw portion 14 are engaged. Are always in close contact with each other in the radial direction of the disk 1, thereby suppressing a problem such as an abnormal noise generated when the two collide with each other due to vibration.

Although the fitting projection 7 has been described as being fitted between the claws 14, a hole along the axial direction of the disc 1 is provided in the claw 14 instead. A protrusion having a position and a shape to be provided may be provided on the back portion 11 a of the outer pad 11.

Although the retainer spring 13 is made of a wire, it may be a leaf spring having an engaging portion that engages with the spring locking projection, an arm portion that elastically deforms, and a pressing portion that contacts the spring contact surface. Further, the positional relationship between the spring contact surface 20 and the concave portion 21 is not limited to the positional relationship in which the retainer spring 13 is rotated by 90 ° around the spring locking projection 15, and the pressing portion 19 b is arranged by rotating the retainer spring 13. Any positional relationship may be used.

[0019]

As described above in detail, according to the disk brake of the present invention, the outer pad can be brought into close contact with the caliper only by rotating the retainer spring around the locking projection provided on the outer pad. Therefore, there is an advantage that a tool or the like is not required for attaching and detaching, and maintainability is good. In addition, since the deformation of the retainer spring can be minimized, the spring force of the retainer spring is not reduced, and the reliability can be maintained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state where a retainer spring is located in a concave portion of a caliper in a disk brake according to one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a state in which an outer pad is fitted between claw portions of a caliper in the disc brake of FIG. 1;

FIG. 3 is a partially cutaway front view showing a state in which an outer pad is mounted on a caliper in the disc brake of FIG. 1;

FIG. 4 is a partially cutaway plan view showing a state in which an outer pad is mounted on a caliper in the disc brake of FIG. 1;

FIG. 5 is a side view showing a spring locking projection on the back of the outer pad in the disc brake of FIG. 1;

FIG. 6 shows an engagement portion of a retainer spring in the disc brake of FIG.

FIG. 7 is a longitudinal sectional view showing a modification of a pressing portion and a spring contact surface of a retainer spring.

FIG. 8 is a partially cutaway plan view showing a conventional disc brake.

9 is a partially cutaway front view showing the disc brake of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc 2 Inner pad 7 Fitting convex part 11 Outer pad 11a Back part 12 Caliper 13 Retainer spring 14 Claw part 15 Spring locking projection 18 Engaging part 19 Arm part 19a Pressing part 20 Spring contact surface 21 Depression

Claims (1)

(57) [Claims] An outer pad and an inner pad provided at positions opposed to each other with a disk interposed therebetween, and a caliper for displacing the pads toward the disk together in a direction approaching to the disk. Two pawls are provided to support the outer pad in close contact with the back, and on the back of the outer pad, a fitting protrusion fitted to the pawl and transmitting the rotational torque of the disc to the caliper is mounted on the caliper. A spring engaging projection projecting at an intermediate position between the two claws in a state in which the retainer spring is rotatably engaged with the spring engaging projection. An engagement portion engaged with the spring engagement projection, an arm portion extending in both directions around the engagement portion, and a tip of the arm portion. And a pressing portion which sandwiches the claw portion between the claw portion and an outer pad is provided. The claw portion is provided with a spring contact surface pressed by the pressing portion, and is provided between the two claw portions. The height from the surface to which the outer pad is in close contact with the spring contact surface is lower than the spring contact surface, and a concave portion in which the pressing portion of the retainer spring can be arranged is arranged alongside the spring contact surface in the rotation direction of the retainer spring. Disc brake characterized by the following.