JPH0139948Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention straddles a pair of first and second friction pads placed on both sides of a disk that rotates together with the wheel at a bridge part, and The present invention relates to a pad spring in a disc brake device for a vehicle, in which a pad spring that presses and holds both friction pads is supported by a caliper having a first arm and a second arm that push.

[Conventional technology]

As is well known, in a vehicle disc brake device equipped with a floating type caliper or a piston-opposed type caliper, the first and second friction pads that slide against both sides of the disc and perform a braking action are susceptible to vibration or rattling. A pad spring is provided to prevent this.

This pad spring, for example,
As shown in Japanese Patent No. 97238, it is formed of a single plate-shaped elastic body and is provided on the inner wall of the bridge portion of the caliper so as to press the upper portions of both friction pads inward in the radial direction of the disk. To explain this based on FIG. 6, the pad spring 20
a connecting portion 20a that is press-fitted to the inner wall of a bridge portion that connects the first arm and the second arm of the caliper;
An arm 20b extends from the center of the connecting portion 20a in both directions of disk rotation and retraction, and both arms 20
A pad pressing piece 20c is provided at the tip of b and extends in both directions in the axial direction of the disk for pressing the friction pad inward in the radial direction of the disk.A connecting portion 20a is set on the inner wall of the bridge portion of the caliper, and the connecting portion The friction pads on the piston side and the friction pads on the non-piston side are pressed inward in the radial direction of the disk by pad presser pieces 20c formed extending in both directions in the disk axial direction at the tips of both arms 20b extending from the center of the disk 20a. It is something to keep.

[The problem that the idea attempts to solve]

However, if the piston is provided only on one side,
The piston is pushed by hydraulic pressure to press the first friction pad against the disk, and the reaction force moves the caliper in the axial direction of the disk, pulling the second friction pad facing the opposite surface of the disk. In the case of a floating type caliper in which a disc is sandwiched between both friction pads for braking, the braking distance between the disc and the friction pad, which increases due to wear of both friction pads, is automatically adjusted. Therefore, the first friction pad on the piston side moves toward the disk.

Therefore, the pressing point of the second friction pad on the non-piston side of the pad spring does not change from the initial value, but the pressing point of the first friction pad on the piston side gradually moves inward from the outside of the pad holding piece 20c. The arm 20b moves toward the tip and approaches the pressing point of the other second friction pad, and the pressing load on the first friction pad increases.

As a result, the set pressing force of the pad spring cannot be maintained, causing the set balance of the friction pad to collapse, causing the friction pad to tilt, uneven wear, and drag.

In addition, in the case of a piston facing type caliper in which opposing pistons press the first and second friction pads from both sides of the disk, both friction pads can be adjusted by adjusting the braking distance due to wear of the friction pads. Although the caliper moves toward the disk, the amount of movement may be uneven, which causes the friction pad set by the pad spring to become unbalanced, causing the same problem as in the case of the floating type caliper.

The present invention was developed against the background of the above circumstances, and it transfers the fluctuation of the pressing load of the pad spring that occurs on one pad pressing part of the pad spring due to wear of the friction pad to the other pad pressing part. It reduces the transmission of force, maintains the set pressing force of the pad spring, properly presses and holds the friction pad, and prevents vibration and rattling of the friction pad, preventing uneven wear and dragging of the friction pad. The purpose of the present invention is to provide a pad spring in a vehicle disc brake that reduces the amount of stress.

[Means to solve the problem]

In order to achieve the above-mentioned object, the pad spring of the present invention has a bridge portion that straddles a pair of first and second friction pads arranged on both sides of a disk that rotates together with a wheel. In the disc brake device for a vehicle, a pad spring that presses and holds the first and second friction pads inward in the disc radial direction is supported on a caliper having A connecting portion that connects the pressing portions of the pads, is locked to the inner wall in the disk axial direction of the bridge portion, and has almost the entire surface pressed against a rib portion in the disk axial direction of the approximately central top wall of the bridge portion, and a caliper of the connecting portion. A pair of first friction pad pressing parts that extend from the first arm side in both directions of disk rotation and retrieval and press the first friction pad, and the first friction pad pressing parts are formed separately and independently, and the caliper of the connection part is formed separately. A pair of second friction pad pressing parts extend from the second arm side in both directions of disk rotation and retrieval to press the second friction pad, and the first and second friction pad pressing parts are arranged on the disk side inward in the radial direction of the disk. The disc is characterized in that it includes a locking part that protrudes from the disc and restricts movement in the axial direction of the disc.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

On both sides of disk 1, which rotates together with the wheels,
A pair of first and second friction pads 2, 3 are arranged on the caliper 4. Caliper 4 has the first arm 4
A, a second arm 4b, and a bridge portion 4c connecting both arms 4a, 4b are integrally formed, and are supported movably in the disk axial direction by a bracket 5 fixed to the vehicle body.

The bridge portion 4c includes the disk 1 and the first and second disks.
A piston 6 is provided to straddle the friction pads 2 and 3, and a piston 6 is provided on the first arm 4a so as to be slidable in the cylinder 7, and a master cylinder (not shown) is operated to open the liquid chamber of the cylinder 7. When pressure fluid is supplied to 8, the piston 6 moves forward due to the pressure,
The back surface of the back plate 2a of the first friction pad 2 on the first arm side is pressed to press the pad 2 against one side of the disk 1. On the other hand, the second arm 4b is in contact with the back surface of the back plate 3a of the second friction pad 3 on the second arm side.

A pair of hanger pins 9, 9 parallel to the disk axis are removably provided between the first arm 4a and the second arm 4b. It penetrates through pins 9, 9 and is suspended so as to be slidable in the axial direction of the disk.

The hanger pins 9, 9 have positioning protrusions 9a, 9a on the outside of one end, and an annular groove 9 on the outer periphery of the other end.
The positioning protrusions 9a, 9a contact the outer surface of the first arm 4a to determine the installation position of the hanger pins 9, 9, and the annular grooves 9b, 9b are formed in the second arm 4b. The locking pieces 11a, 11a of the retaining member 11, which is exposed to the outside and fixed to the bridge portion 4c by the fixing bolt 10, are engaged with the annular grooves 9b, 9b to prevent the retaining member from coming off.

The inner wall of the bridge portion 4c of the caliper 4 and the first and second
Between the friction pads 2 and 3, there are both friction pads 2 and 3.
A pad spring 12 is provided to press and hold the disc 1 inward in the radial direction.

This pad spring 12 includes a pair of first friction pad pressing portions 12 that press the first friction pad 2.
a, 12a, and a pair of second friction pad pressing parts 12b, 12b that press the second friction pad 3,
They are provided on the connecting portion 12c so as to operate independently, and further include first friction pad pressing portions 12a, 12a.
The second friction pad pressing portions 12b, 12b have locking portions 12d, 12d, and the second friction pad pressing portions 12b, 12b have locking portions 12e,
12e are provided respectively.

The first friction pad pressing portions 12a, 12a are formed as a pair of wide left and right, and are formed on the top wall 4 of the bridge portion 4c.
The first arm side of the caliper 4 is located closer to the first arm of the caliper 4 than the connecting portion 12c which is pressed against the rib portion 4e in the disk axial direction formed at It is provided with a slight inclination and presses the upper part of the back plate 2a of the first friction pad 2 so as to be slidable.

Further, the second friction pad pressing portions 12b, 12b are
It is formed of a pair of left and right sides with approximately the same width as the back plate 3a, extends in the direction of insertion and rotation of the disk 1 on the second arm side of the caliper 4 from the connecting portion 12c, and is slightly inclined toward the top wall 4d of the bridge portion 4c. The upper part of the back plate 3a of the second friction pad 3 is slidably pressed.

The locking parts 12d, 12d, 12e, 12e are used to restrict the movement of the first and second friction pads 2, 3 in the disk axial direction, particularly in the direction of the disk 1. ,12
b, 12b are provided on the disk 1 side by being bent inward in the disk radial direction.

A bridge portion 4c is provided on the second arm side of the connecting portion 12c.
There is a protrusion 12f that engages with the fixing bolt hole 13 formed through the connecting portion 12c, and a bent portion 12g that presses against the first arm side side wall 4f of the bridge portion 4c on the first arm side of the connecting portion 12c. It is formed.

Padded spring 12 formed as described above
The protrusion 12f is engaged with the fixing bolt hole 13 to position the first arm side and the second arm side, and then the bent portion 12g is pressed against the first arm side side wall 4f of the bridge portion 4c, The connecting portion 12c is connected to the bridge portion 4c.
Temporary fixing is performed by pressing against a rib portion 4e provided in the center of the top wall 4d in the disk axial direction.

And the friction pads 2 on the first arm side and the second arm side,
3 is suspended by the hanger pins 9, 9, the pad pressing portions 12a, 12a, 12b, 12b of the pad spring 12 on the first arm side and the second arm side press against the back plates 2a, 12b of both friction pads 2, 3. The upper part of the disk 3a is pressed inward in the radial direction of the disk 1 to be assembled.

Thereby, the pad spring 12 is
The back plates 2a, 3a of the second friction pads 2, 3 are held under pressure with a set load, and vibration and wobbling of the friction pads 2, 3 are prevented.

Next, the operation of this embodiment will be explained.
When pressurized fluid is supplied from the master cylinder (not shown) to the hydraulic chamber 8 by operating the brake pedal,
The piston 6 moves forward due to the pressure fluid, presses the first friction pad 2, and presses the pad 2 against one side of the disk 1. Then, due to the reaction,
The caliper 4 moves in the opposite direction to the piston 6,
The second friction pad 3 is pressed by the second arm 4b, and the pad 3 is brought into pressure contact with the other side surface of the disk 1, thereby performing a braking action.

Then, repeat the above-mentioned braking operation, and then
When the friction pads 2 and 3 wear out, the braking distance between the disc 1 and both friction pads 2 and 3 increases, but along with this, the piston 6 moves forward.
The first friction pad 2 is moved closer to the disk 1 and the braking distance is adjusted so that it is always constant.

By adjusting the braking interval, the pressing point of the second friction pad pressing portions 12b, 12b of the pad spring 12 does not change from the initial value, but the first friction pad 2 is lower than the first friction pad pressing portion 12a, 12a. In order to slide and move, the first friction pad pressing portion 12
The pressing points of a and 12a approach the second arm side.

Due to this movement of the pressing point, the pressing load of the pad spring 12 changes from the initial value on the first arm side, but the first friction pad pressing part 12a, 12a and the second
Since the friction pad pressing portions 12b, 12b are formed independently and only connected by the connecting portion 12c, the influence of load fluctuations on the first arm side on the second arm side is reduced.

Therefore, the first and second friction pads 2, 3 are held by the pad spring 12 with a pressing force within a predetermined range, so that the friction pads 2, 3 are not tilted, uneven wear is prevented, and the pads themselves It can also prevent dragging.

In addition, when assembling both friction pads 2 and 3 to the caliper 4, the first friction pad pressing portions 12a, 12a and the second friction pad pressing portions 12b, 12b of the pad spring 12 are formed on the disk 1 side. By the locking parts 12d, 12d, 12e, 12e,
Movement of both friction pads 2 and 3 in the disk axial direction is restricted, and the first and second friction pads 2 and 3 are pressed against the first and second friction pad pressing portions 1 of the pad spring 12.
2a, 12a, 12b, 12b, and can be placed accurately on the underside of the disc 1 without coming off, and a predetermined interval is set between the two friction pads, making it easy to attach the caliper 4 that is placed across the disk 1. There is.

In the above embodiment, a disc brake with a floating type caliper was described, but the present invention can be similarly implemented with a piston facing type caliper. In this case, the pad pressing portion of the pad spring is formed to have the same wide width on both the first arm side and the second arm side, since both friction pads move toward the disk side by adjusting the braking interval.

[Effect of idea]

As mentioned above, the padded spring of this invention is
A pair of first friction pad pressing parts that extend in both directions of disk rotation and retrieval from the connecting part at the center of the bridge part on the first arm side of the caliper and press one of the first friction pads, and are independent from the first friction pad pressing part. and a pair of second friction pad pressing portions extending in both directions of disk rotation and retraction on the second arm side of the caliper from the central connecting portion of the bridge portion and pressing the other second friction pad, the connecting portion comprising: The first and second friction pads are fixed to the inner wall of the bridge portion in the disk axial direction and are provided in pressure contact with the substantially central top wall of the bridge portion, and are further provided on the disk side of the first and second friction pad pressing portions, respectively. Since the locking part that restricts the movement of the disk in the axial direction is provided so as to protrude inward in the radial direction of the disk, the braking distance is adjusted by the wear of both friction pads, and thereby the first friction Even if the pad moves toward the disk and the pressure point of the first friction pad pressing part of the pad spring moves and a load fluctuation occurs, it is hardly transmitted to the second friction pad pressing part, and both friction pads The pad spring is held with a pressing force within a predetermined range, effectively preventing vibration and rattling of the friction pad, and since the friction pad does not tilt, uneven wear and dragging of the pad itself can be prevented. .

Further, the connecting portion connecting the first and second friction pad pressing portions is engaged with the inner wall of the bridge portion in the disk axial direction, and is in pressure contact with the substantially central top wall of the bridge portion, and is connected to the first and second friction pad pressing portions. Since the friction pad pressing portions are provided separately and independently, even if the friction pads are worn and move, each friction pad pressing portion can press both friction pads stably without tilting.

Furthermore, when both friction pads are assembled into the caliper, the movement of the friction pads in the disk axial direction is regulated by the respective locking parts of the pad springs, and both friction pads are attached to the pressing parts of the pad springs. It can be placed accurately on the underside without coming off, and since a predetermined distance is set between the two friction pads, it is easy to attach the caliper that is placed across the disk.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention, in which Figure 1 is a plan view of a disc brake, Figure 2 is a plan view of a disc brake;
The figure is also a cross-sectional front view, and Figure 3 is the − of Figure 1.
4 is a plan view of the pad spring, FIG. 5 is a front view, and FIG. 6 is a perspective view of a conventional pad spring. 1... Disk, 2... First friction pad, 3...
...Second friction pad, 4...Caliper, 4a...First arm, 4b...Second arm, 4c...Bridge part, 1
2... Pad spring, 12a... First friction pad pressing part, 12b... Second friction pad pressing part,
12c...Connection part.

Claims (1)

[Scope of utility model registration request] A pair of first and second friction pads arranged on both sides of a disk that rotates together with the wheel is straddled at a bridge portion, and the first and second friction pads are attached to a caliper having a first arm and a second arm. In a disc brake device for a vehicle, the pad spring has a pressing portion for pressing and holding first and second friction pads inwardly in the radial direction. a connecting portion that connects the portions, is locked to the inner wall in the disk axial direction of the bridge portion, and has substantially the entire surface pressed against a rib portion in the disk axial direction of the bridge portion substantially central top wall; and a first arm of the caliper of the connecting portion. A pair of first friction pad pressing parts that extend from the sides in both directions of rotation of the disc and pressing the first friction pad, and the first friction pad pressing parts are formed separately and independently, and the second caliper of the connecting part
a pair of second friction pad pressing parts that extend from the arm side in both directions of disk rotation and withdrawal, and press the second friction pad; and a pair of second friction pad pressing parts that extend inward in the radial direction of the disk on the disk side of the first and second friction pad pressing parts. 1. A pad spring for a disc brake device for a vehicle, characterized in that the pad spring is provided with a locking part for regulating movement in the axial direction of the disc.