JP2555932Y2 - 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 disc brake used for, for example, a four-wheeled vehicle.

[0002]

2. Description of the Related Art Generally, as a disk brake, FIG.
As shown in FIG.
Pads 2 and 3 movably supported in the axial direction, a piston 6 of a cylinder 5 provided on one side and straddling the pads 2 and 3 and the disk 1, and a claw formed on the other side. There is known a caliper 4 that presses each of the pads 2 and 3 toward the disk 1 with a portion 4a.

[0003] When pressure oil acts on the cylinder 5 from the master cylinder, one pad 2 is pressed against one surface of the disk 1 by the piston 6 of the cylinder 5, and the other side is pressed by the claw 4 a of the caliper 4 by the reaction. The pad 3 of the rotating disk 1 is pressed against the other surface of the disk 1.
In general, a retract spring 7 for urging the pads 2 and 3 away from each other to prevent the pads 2 and 3 from being dragged by the disk 1 and a pad for supporting the pads 2 and 3 (a torque receiving member) are provided. A pad spring (not shown) for pressing against a sliding surface formed on the member to prevent backlash is provided.

The retract spring 7 has two ends 8,
9 is engaged with each of the pads 2 and 3, and a central portion thereof functions as a spring for urging each of the pads 2 and 3. Conventionally, both ends of the pad 2 and 3 have upper ends of the backing plates 2a and 3a. The disk 1 is engaged by being fitted into holes 10 and 11 formed in the radial direction of the disk 1. Further, the pad spring is provided between the pad 2 on the cylinder 6 side and the cylinder 6 or between the pad 3 on the claw 4a side of the caliper 4 and the caliper 4, respectively.

[0005]

In the conventional disk brake described above, the holes 10 and 11 for engaging the retracting spring 7 are provided with the backing plates 2a and 3a of the pads 2 and 3, respectively.
Since the direction is perpendicular to the thickness direction of the hole, it is difficult to drill the hole and the man-hour is required. In addition, since it was difficult to perform the processing with high accuracy, a variation in the load of the retract spring, an improper assembly, and the like sometimes occurred due to an error in the position of the hole.

In addition, since the retract spring and the pad spring are separately provided between the pad and the caliper, there is a problem that the number of parts is large and the assembling requires a lot of time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and enables a retract spring to be mounted accurately and easily, and the retract spring also functions as a pad spring to reduce the number of parts and the number of assembling steps. The purpose is to provide a brake.

[0008]

SUMMARY OF THE INVENTION A disk brake according to the present invention comprises pads arranged on both sides of a disk and supported movably in the axial direction of the disk, and a disk path portion arranged so as to straddle these pads and the disk. Through a caliper that presses each pad toward the disc with a piston provided on one side and a claw formed on the other side, and a center portion where each end is engaged with each pad and the center portion is Disc brake having a retract spring functioning as a spring for biasing the pads in a direction to separate the pads from each other
The retract spring has two ends.
Is formed on one side of the back metal of each pad in the disk circumferential direction.
Facing the disc in the holes in the disc axial direction
It is inserted from the inside of the pad and
The central part to be tied from these two ends to the back metal of each pad
Extends to the other side in the circumferential direction of the disk.
Each overhanging portion that is bent outward and outward, and each overhanging portion;
Disc axis direction across the disc to connect
In the direction of
On the other side in the circumferential direction of the disk
It consists of an edge and a connecting part with a contacting part
Note that each overhang is on the inner surface of the disc path of the caliper.
By elastically abutting each of the pads,
In the radial direction of the disk,
It is characterized in that it is structured to be urged and pressed against its support .

[0009]

According to the disc brake of the present invention, the hole of each pad for engaging the retract spring is formed in the disc.
Since the holes are in the axial direction, that is, in the thickness direction of the back metal, the processing of this hole becomes easy and the processing accuracy can be maintained high. In addition, since the retract spring presses the pad against the supporting portion to prevent backlash, it is not necessary to provide a separate pad spring. Moreover, the back metal die of each pad
In the axial hole of the disc formed on one side of the disc circumferential direction,
Each is inserted from the inside of the pad facing the disk
Extend from both ends to the other circumferential side of the pad,
Overhang bent radially outward on the way to
Across the disc to connect the overhang and the overhang
And extends more than the overhang.
In addition, the disk path of the pad back metal on the other side in the disk circumferential direction
And a connecting portion formed with a contact portion with an edge on the side of the portion.
Contact the inside of the disc path
On the pad on both sides of the overhang
Apply a biasing force toward the center of the
It can be pressed firmly against the holding part. That is, concave
Each pad receives its vibration from a bumpy road etc.
Even if you try to lift it up,
Both ends in the circumferential direction of the disc with respect to the overhang
And it is in contact with the pad by the connecting part, so it overhangs
The part is hard to bend and the pad is firmly and securely supported
Pad bias due to pressing and tilting pad
Wear and rattling can be reliably prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The disk brake according to the present embodiment is supported between a torque receiving member 22 fixed to a non-rotating portion of the vehicle on one side of a disk 21 that rotates with wheels, and two legs 22a, 22a extending from the torque receiving member 22. And pads 23 and 24 arranged on both sides of the disk 21 in a state where the pads 23 are movable in the axial direction of the disk 21.
The legs 23a, 24a are arranged so as to straddle these pads 23, 24 and the disk 21, and are interposed through pins 25a, 25a.
Caliper 25 movably supported by 22a and both ends 3
4 and 34 are engaged with the pads 23 and 24, respectively, and the center portion functions as a spring for urging the pads 23 and 24 in a direction to separate them from each other.
Is provided.

[0011] A cylinder 27 is provided at a position on the back side of the pad 23 of the caliper 25.
A piston 26 facing the back surface of the pad 23 is slidably fitted. Further, on the pad 24 side of the caliper 25, a claw portion 29 extending to the back side of the pad 24 and facing the back surface of the pad 24 is formed.

[0012] retracting spring 31 has been formed by bending a linear material, its central part, as a whole
It is a substantially U-shape when viewed from the disk 21 outer peripheral side, in a state where than the natural state bent resiliently (state having a restoring force in a direction extending right and left in FIG. 1), the caliper 25 disk It is arranged inside the path section 28. On the other hand, both ends 34,
34, those extending in a direction parallel (axial direction of the disk 21) to the substantially along plane connecting portion 33 constituting the central part, each back metal 23a of the pad 23, 24, 24a disk of
Disk formed on the upper end on one side in the circumferential direction
21 facing the disk 21 in the axial holes 38, 38
It is engaged with the pads 23 and 24 by being inserted from the inside of the pads 23 and 24.

The retract spring 31 is provided on the back metal 2.
From both ends 34 , 34 inserted into 3a, 24a, the back metal 23a, 24a extends to the other side in the circumferential direction of the disk 21, and in this process, rises upward (outward in the radial direction of the disk 21).
Convex bend the next overhanging portions 32, out該張
When the lower portions 32, 32 are bent downward, they bend in the axial direction of the disk 21 to form the respective back plates 23a, 24 of the pads 23, 24.
a to traverse from the inside of the pads 23 and 24 to the outside.
The disk 21 extends in the axial direction, and
1 are bent toward the opposite side in the axial direction and connected to each other.
Disk path portion 2 of back metal 23a, 24a of
Abutment portions 33a, 33a that abut against the edge on the 8th side are formed.
The connecting portion 33 is provided. And this connecting part 33
Overhang portions 32, 32 formed in the perpendicular direction to the ends 34, 34 are configured to resiliently contact the inner surface 28a of the disk path portion 28 of the caliper 25 Te overhang (the outer periphery of the disc 21) I have. That is, the retract spring 31 is moved by the elastic force of the overhang portions 32, 32.
Both ends 34, 34 engaged with the back metal members 23a, 24a are in contact with the edges of the back metal members 23a, 24a on the disk path portion 28 side.
In a connecting portion 33 for the pad 23, 24 disks 21
The sliding surfaces 22b, 2 of the torque receiving member 22, which slidably support the sliding surfaces 22b, 2
2b.

In the disc brake constructed as described above, when pressure oil acts on the cylinder 27 from a master cylinder (not shown), the piston 26
3 is pressed against one surface of the disk 21, and the claw portion 29 of the caliper 25 presses the pad 24 against the other surface of the disk 21 by this reaction, whereby the rotating disk 21 is braked (that is, the vehicle).

At this time, the pads 23 and 24 are pressed against the sliding surface 22b by the retract spring 31.
Since it slides while being pressed against the support portion, there is no backlash. After braking, the pads 23 and 24 are pushed in a direction away from each other by the restoring force of the central portion of the retract spring 31, so that the pads 23 and 24 do not come into contact with the disk 21 during non-braking. The drag phenomenon is prevented.

As described above, according to the disc brake described above, the drag of the pad and the play of the pad are prevented by the retract spring 31 alone, and the hole 38 of each pad for engaging the retract spring 31 is formed. Since the thickness of the back metal 23a, 24a is in the thickness direction, the processing of the hole 38 is easy, and the processing accuracy can be maintained high. For this reason, the number of parts and the number of assembly steps can be reduced, and the load of the retract spring 31 can be prevented from fluctuating and assembly failure can be prevented. Moreover, the back metal 23a, 24a of each pad 23, 24
Disk 21 formed on one side in the circumferential direction of disk 21
In the axial holes 38 of the
Both ends 34, 34 inserted from inside the pads 23, 24,
The circumferential direction of the pads 23 and 24 from these both ends 34 and 34
Side, and on the way, it protrudes radially outward of the disc 21
Bent overhanging portions 32, 32, and overhanging portions 32, 32
Discs across the disc 21 to connect them
21 and extends from the overhanging portions 32
Of the pads 23 and 24 on the other side of the disk 21 in the circumferential direction.
The edge of the back metal 23a, 24a on the disk path portion 28 side is
Connecting portion 33 having contact portions 33a, 33a in contact therewith
And the disk path unit 28
The disk 21 of the overhanging portions 32, 32 abutting on the side
To the center of the disk 21 on the pads 23 and 24 on both sides in the circumferential direction
To the pads 23 and 24 to support the pads 23 and 24.
It can be pressed firmly against the holding part. That is, concave
Each pad 23, 24 receives the vibration due to the bumpy road surface and the like.
Even if the disk path section 28
For the overhanging portions 32, 32 abutting inside the
Both ends in the circumferential direction of the disc 21 are both ends 34, 34 and a connecting portion 33.
Because they are in contact with pads 23 and 24
The portions 32, 32 are hard to bend, and the pad 2
3 and 24 are pressed against the support, and the pads 23 and 24
Uneven wear of the pads 23 and 24 due to the inclination and
Rattle can be reliably prevented. In addition,
The connecting part constituting the central part
At 33, the dicing of the back metal 23a, 24a of the pads 23, 24 is performed.
Shaped so as to cross the edge on the side of the scraper 28
Where is between both ends 34, 34 and the connecting portion 33
It may be horizontal cut.

In FIG. 2, the portion indicated by the symbol X is:
Discs 21 on the backs 23a, 24a of the pads 23, 24
Alternatively, the pads 23 and 24 may be pressed in a direction in which the pads 23 and 24 are returned at this portion.

[0018]

As is apparent from the above description, according to the disc brake of the present invention, the pad can be prevented from being dragged and the pad can be prevented from rattling with only one retract spring, and the retract spring can be engaged. Since the hole of each pad is in the thickness direction of the pad back metal, the processing of this hole is easy and the processing accuracy can be maintained high. Therefore, it is possible to reduce the number of parts and the number of assembling steps, and it is possible to prevent a change in the load of the retract spring and a defective assembly. I
Also, the back metal of each pad is formed on one side in the disk circumferential direction.
Face the disc in the axial holes of the disc
Both ends inserted from the inside of the pad
To the other side in the circumferential direction of the disk, and
Connects the overhangs that are bent to the side and the overhangs
Extends in the axial direction of the disc across the disc to
At the same time, on the other side in the disk circumferential direction than the overhang
The part that contacts the edge of the pad back metal on the disk path side
And a connecting portion formed with
The disk of the overhang that is in contact with the inside of the
Energizing the pad toward the center of the disc on both sides in the circumferential direction
Apply force and press pad firmly against its support
Can be In other words, it is subject to vibration due to uneven road surfaces, etc.
If each pad tries to lift off its support,
Data for the overhanging part that is in contact with the disk path
Both sides in the disk circumferential direction are padded by both ends and connecting parts.
, So the overhang is hard to bend and firmly
Press the pad firmly against its support, and tilt the pad.
Ensure uneven pad wear and backlash caused by padding
Can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view of a disc brake according to the present invention, in which a part of a caliper is cut away.

FIG. 2 is a view of the disc brake of the present invention as viewed from the axial direction of the disc, in which a part of a caliper is cut away.

FIG. 3 is a side sectional view of a conventional disc brake (a view as viewed from the circumferential direction of the disc).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 21 Disc 23, 24 Pad 23a, 24a Pad back metal 25 Caliper 26 Piston 28 Disc pass part of caliper 28a Inner surface of disc pass part of caliper 29 Claw 31 Retract spring 32 Retract spring overhang 33 Connection part of retract spring 33a Retract spring Abutment part 34 Both ends of retract spring 38 Hole in back metal of pad

Claims (1)

(57) [Scope of request for utility model registration] 1. A pad disposed on both sides of a disk and supported movably in an axial direction of the disk, and a disk path portion disposed so as to straddle these pads and the disk.
To the piston and the caliper to press at a pawl portion formed on the other side towards the respective pads to each disk, both ends being engaged engagement to each pad central portion each pad provided on one side biases to each other direction away disks with a retracting spring which functions as a spring
In the brake, both ends of the retract spring are located on one side in the disk circumferential direction of the back metal of each pad.
In the formed disc axial holes, each in the disc
The central portion that is inserted from the inside of the opposing pad and connects between both ends is
Extend the back metal of each pad to the other side in the disk circumferential direction, and
Each overhanging part bent outward in the radial direction of the disk
And cross the disk to connect the overhangs
As shown in FIG.
The back metal of each pad on the other side in the disk circumferential direction.
Connection with a portion that contacts the edge of the disc path
And each of the overhanging portions is an inner surface of a disc path portion of the caliper.
Each pad is elastically contacted with
In the radial direction of the disk,
A disc brake having a structure for urging the disc brake against the support portion .