JP2002161931A - Disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disc brake capable of preventing uneven wear generated on a friction pad by preventing the inside of a friction pad in a disc radial direction from being dragged toward the disc. A pad spring (10) has a friction pad (6).
Abuts on the outer side in the disk radial direction of the
An outer pad pressing portion 20 for pressing the friction pad 6 in a direction away from the disk 1 in the axial direction, and an inner pad for abutting the friction pad 6 inside the disk in the disk radial direction and pressing the friction pad 6 in a direction away from the disk 1 in the axial direction. Pressing part 1
1, both the inside and the outside in the disk radial direction of the friction pad 6 are pressed in a direction away from the disk 1 in the axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opposed piston type disc brake which is suitably used to apply a braking force to a vehicle or the like.

[0002]

2. Description of the Related Art In general, opposed piston type disk brakes used in vehicles are provided with inner and outer calipers provided with a pair of torque receiving portions which are arranged with a disk interposed therebetween and are spaced apart in the rotational direction of the disk. And inner and outer friction pads slidably supported between the torque receiving portions of the caliper.

A support pin is provided between each of the calipers, and the support pin is inserted into a pin hole formed in a back metal of the friction pad to support the friction pad movably in the axial direction of the disk. ing. Further, each of the calipers is provided with a pair of pad springs spaced apart from each other in the rotation direction of the disk, and the pad springs guide the friction pads along the torque receiving portion.

In this type of conventional disc brake, brake fluid pressure is supplied from the outside to the inner and outer caliper cylinders during the brake operation, whereby the piston slides and displaces each friction pad to the disc. And applies a braking force to the disk.

Here, for example, pad springs include:
As shown in Japanese Patent Application Laid-Open No. 2000-158441 and the like, a pad guide body portion interposed between a torque receiving portion of a caliper and a friction pad to guide movement of the friction pad in a disk axial direction, And a return spring portion which abuts on the outer side in the radial direction of the disk (opposite side from the center of the disk) to press the friction pad in a direction away from the disk. When the pressure is released, the return spring portion separates the friction pad from the disk by the urging force.

[0006]

By the way, in the pad spring having the above-mentioned structure, the return spring portion abuts on the outer side of the friction pad in the disk radial direction and presses the friction pad in a direction away from the disk. If the sliding of the pad with respect to the pad spring becomes unsmooth due to a change or the like, the outer side of the friction pad in the disk radial direction can be separated from the disk, but the inner side (disk center side) in the disk radial direction is separated from the disk. As a result, the inside of the friction pad in the radial direction of the disk is dragged toward the disk, and there is a problem that the inner portion is unevenly worn, which is unevenly worn.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a disc brake capable of preventing uneven wear occurring on a friction pad by preventing the inside of the friction pad in the disc radial direction from being dragged toward the disc.

[0008]

In order to achieve the above-mentioned object, a disk brake according to the present invention is provided with a pair of torque receiving portions provided with a pair of torque receiving portions disposed so as to sandwich a disk and spaced apart in a rotational direction of the disk. An outer-side caliper, inner-side and outer-side friction pads slidably supported between the respective torque receiving portions of the caliper and pressed against the surface of the disc by pistons, and the friction provided between the respective calipers; A support pin that is inserted through the back metal of the pad to support the friction pad movably in the axial direction of the disk; and a support pin that is spaced apart in the rotational direction of the disk to guide the friction pad along the torque receiving portion. And a pair of pad springs provided on each of the calipers, wherein the pad spring has a disk radial direction of the friction pad. An outer pad pressing portion that abuts an outer side of the friction pad and presses the friction pad in a direction away from the disk in an axial direction, and a direction that abuts an inner side of the friction pad in a disk radial direction and separates the friction pad from the disk in an axial direction. And an inner pad pressing portion for pressing the inner pad.

As described above, the pad spring has an outer pad pressing portion which comes into contact with the outer side of the friction pad in the disk radial direction and presses the friction pad in a direction away from the disk in the axial direction, and the friction pad in the disk radial direction. An inner pad pressing portion that abuts on the inner side and presses the friction pad in a direction away from the disk in the axial direction is provided, so that the inner pad pressing portion and the outer pad pressing portion allow the friction pad to move inward in the disk radial direction. And both the outside and the outside are pressed in a direction axially away from the disc. Therefore, even if the friction pad does not slide smoothly with respect to the pad spring due to a change in surface properties, for example, both the inside and the outside of the friction pad in the disk radial direction can be separated from the disk.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicle in which an opposed piston type disc brake according to an embodiment of the present invention is applied to a vehicle. FIG.

1 is a disk that rotates with the wheels of the vehicle,
Reference numerals 2 and 3 denote outer-side and inner-side calipers which are disposed with the disk 1 interposed therebetween. The outer-side calipers 2 are formed to be long in the rotation direction of the disk 1, and the surface facing the disk 1 has a side facing the disk 1. It is the inner end face 2A. Further, a pad receiving recess 2B is provided at the center of the inner end surface 2A of the caliper 2 and abutment portions 2C, 2C protrude from both sides of the pad receiving recess 2B. The abutting portion 2C of the caliper 2 extends in an arc shape on the outer side in the radial direction of the disk 1 (the side opposite to the center of the disk 1), and a disk path is formed between the abutting portion 3C of the caliper 3 to be described later. Unit.

Further, on both sides of the pad housing recess 2B,
As shown in FIGS. 4 and 5, the spring accommodating recesses 2D, 2D
Is provided, and an inner pad pressing portion 11 of a pad spring 10 described later is accommodated in the spring accommodating recess 2D. In addition, the spring receiving recess 2D is
Has a wall surface 2D1 that extends substantially horizontally along the rotation direction of. The inner end face 2A of the caliper 2 is provided with shallow notched recesses 2E, 2E extending in an arc shape from the pad accommodating recess 2B toward the rotation direction of the disk 1.

On the other hand, the caliper 3 on the inner side also
As shown in FIGS. 3 and 6, substantially the same as the caliper 2, the inner end face 3A, the pad receiving recess 3B, the abutment portions 3C, 3C, the spring receiving recesses 3D, 3D, the cutout recesses 3E, 3E and the like are provided. 3D has a wall surface 3D1. As shown in FIG. 1, the caliper 3 is provided with mounting brackets 3F, 3F protruding inward in the radial direction of the disk 1 (center side of the disk 1).

The calipers 2 and 3 are connected to a fastening bolt 1 (described later) with the abutting portions 2C and 3C abutting each other.
5, 16 and the like, and a mounting bracket 3F is mounted to a front fork of the vehicle via bolts (not shown) or the like. Also, caliper 2,
As shown in FIG. 2, the pad receiving recesses 2B and 3B of FIG. 3 form a substantially rectangular opening between them, and the opening formed by the pad receiving recesses 2B and 3B is used to replace a friction pad 6 described later. A work window for inserting and removing the friction pad 6 at times and the like is configured.

Reference numerals 4 and 4 denote outer-side torque receiving portions formed on the caliper 2 on both sides of the pad accommodating recess 2B.
The torque receiving portion 4 extends in the radial direction at a distance from the disk 1 in the rotation direction. The torque receiving unit 4 guides the friction pad 6 together with the pad spring 10 in the axial direction of the disc 1 during the brake operation, and
This receives torque from the disk 1 acting on the disk.

The caliper 3 also has inner side torque receiving portions 5 (only one is shown in FIG. 6) located on both sides of the pad receiving recess 3B.

Reference numerals 6 and 6 denote outer-side and inner-side friction pads respectively provided in the pad accommodating recesses 2B and 3B of the calipers 2 and 3. The friction pad 6 includes a substantially fan-shaped lining 7 and the lining 7. 7, a substantially rectangular back metal 8 slidably mounted on a pad spring 10 described later.
It is composed of

Here, among the four corners of the substantially rectangular back metal 8, the corners located on the inner side in the radial direction of the disk 1 are provided with inclined surfaces 8A, 8A. The inclined surface portion 8A is arranged obliquely with a constant inclination angle θ as shown in FIG.
The angle is set to about 30 to 60 degrees, preferably about 45 degrees. The back metal 8 is provided with a pair of pin holes 8B, 8B which are located outside the lining 7 in the radial direction of the disk 1 and have an oval shape.

The outer and inner friction pads 6 are provided in the pad receiving recesses 2B, 3 of the calipers 2, 3.
B is slidably supported by a pad spring 10 via a pad spring 10. When a brake is operated, pistons (not shown) provided in the cylinders are slid by brake fluid pressure supplied from the outside, and the friction pad 6 is disc-shaped. 1 is pressed against the surface.

Reference numerals 9 and 9 denote support pins which are detachably provided between the calipers 2 and 3 at a distance in the rotation direction of the disk 1.
The support pins 9 are arranged radially outside of the disc 1, and both ends thereof are fixed while penetrating the calipers 2 and 3 in the axial direction. And the support pin 9
Is inserted into the pin hole 8B of the friction pad 6, and supports the friction pad 6 so as to be movable in the axial direction of the disk 1.

Reference numerals 10 and 10 denote a pair of pad springs provided on the calipers 2 and 3 apart from each other in the rotation direction of the disk 1. The pad springs 10 are formed by press-forming a stainless steel plate having spring properties. It is formed as shown in FIGS. And pad spring 1
Numeral 0 is generally constituted by inner pad pressing portions 11, 11, guide plate portions 12, 12, connecting plate portion 13, reaction force receiving portion 14, and outer pad pressing portions 20, 20 to be described later.

Reference numerals 11 and 11 denote inner pad pressing portions integrally formed on one end side of a guide plate portion 12 which is located inside the disk 1 in the radial direction. It is composed of a pressing plate portion 11A bent and extended in a substantially rectangular shape and a folded plate portion 11B folded in a substantially V shape from the opposite side of the guide plate portion 12 of the pressing plate portion 11A.

Here, the pressing plate portion 11A is bent obliquely with respect to the guide plate portion 12 so that the side of the disk 1 in the axial direction of the disk 1 is located slightly closer to the friction pad 6 than the side opposite to the disk 1. It is bent while drawing a line.

That is, while the guide plate portion 12 and the folded plate portion 11B are parallel to the axis of the disc 1, the pressing plate portion 11A is slightly inclined with respect to the direction parallel to the axis of the disc 1.

A substantially U-shaped cut 11C is formed in the folded plate portion 11B and extends to the vicinity of the distal end portion of the pressing plate portion 11A. The cut 11C forms the radius of the disc 1 in the widthwise intermediate portion of the folded plate portion 11B. A tongue portion 11D bent obliquely inward in the direction is integrally formed.

The pressing plate portion 11A of the inner pad pressing portion 11 elastically contacts the inclined surface portion 8A of the back metal 8, which is inside the friction pad 6 in the disk radial direction, as shown in FIGS. And press the friction pad 6 with the pressing force F
1 is pressed obliquely upward. That is, as shown in FIGS. 7 and 10, the pressing force F1 of the pressing plate portion 11A
Is a pressing component force f1 directed outward from the contact position along the radial direction of the disc 1, a pressing component force f2 directed from the contact position toward the friction pad 6 along the rotational direction of the disc 1, and a disc component 1 from the contact position. In the three directions of the pressing force f3, which is directed to the opposite side to the disk 1 along the axial direction of the disk 1.

For this reason, the pressing plate portion 11A of the inner pad pressing portion 11 presses the friction pad 6 outward in the radial direction of the disk 1, that is, toward the support pin 9 by the pressing component force f1, and the pressing component force f1. The friction pad 6 is pressed toward the opposing pad springs 10 (torque receiving portions 4 and 5) along the rotational direction of the disc 1 by f2, and further, the friction pad 6 is pressed in the axial direction of the disc 1 by a pressing force f3. On the opposite side to disk 1 (disk 1
(In the direction away from the axis in the axial direction).

The folded plate portion 11B of the inner pad pressing portion 11 is provided with the spring accommodating recesses 2D, 3 of the calipers 2, 3.
D in this state, the tongue piece 11D is located on the inner side of the friction pad 6 in the radial direction of the disk 1 and the wall surfaces 2D1, 3D1 of the spring receiving recesses 2D, 3D.
Elastically contact the The tongue piece 11D is moved from the friction pad 6 to the inner pad pressing portion 11 during the brake operation.
Is applied to the walls 2D1, 3 of the calipers 2, 3.
It is configured to receive data with D1.

The tongue piece portion 11D of the inner pad pressing portion 11 moves the entire pad spring 10 between the calipers 2 and 3 in the radial direction of the disc 1 between a hooking plate portion 13A of the connecting plate portion 13 described later. It also has the function of positioning.

Reference numerals 12 and 12 denote outer side and inner side guide plate portions provided between the torque receiving portions 4 and 5 of the calipers 2 and 3 and the friction pad 6, respectively.
It extends in parallel along the radial direction of the disk 1 and is mounted in abutment with the torque receiving portions 4 and 5. The guide plate 12 guides the back metal 8 of the friction pad 6 slidably in the axial direction of the disk 1 with respect to the torque receiving parts 4 and 5.

A hooking projection 12A is protruded from the guide plate 12 at an intermediate position in the longitudinal direction.
Are positioned in the axial direction and the radial direction of the disk 1 with respect to the calipers 2 and 3 by being engaged with the notched concave portions 2E and 3E of the calipers 2 and 3.

Further, a pad guide projection 12B is integrally formed on the other end side (base end side) of the guide plate portion 12 in the longitudinal direction. The pad guide projection 12B is bent from the base end side of the guide plate portion 12 in a direction opposite to a bent plate portion 14A of the reaction force receiving portion 14 described later, and the friction pad 6 is placed between the pair of pad springs 10. When mounting, the friction pad 6 is guided inward in the radial direction of the disk 1.

Reference numeral 13 denotes a position outside the friction pad 6 in the radial direction of the disk 1, and guide plate portions 12, 1
2 are connecting plates connected to each other in the axial direction of the disk 1, and the connecting plate 13 is provided with the abutting portions 2 of the calipers 2 and 3.
It is in contact with the wall surfaces of C and 3C.

At one end of the connecting plate 13 inside the disk 1 in the radial direction, a latching plate 13A is bent in a substantially L-shape in a direction opposite to the reaction force receiving unit 14. The latch plate 13A is latched from the radial direction of the disk 1 to the wall surfaces (disk paths) of the abutting portions 2C and 3C of the calipers 2 and 3.

A reaction force receiving portion 14 is formed integrally with the other end of the connecting plate portion 13 which is located outside in the radial direction of the disk 1. A bent plate portion 14A formed by bending the disk 1 in a substantially L-shape in the direction of rotation of the disk 1 in the opposite direction to the bent portion 1A;
The contact plate 14B is bent in a substantially L-shape from the distal end side of the disc 4A to the inside in the radial direction of the disc 1 and has a surface that elastically contacts the support pin 9. Further, the distal end side of the contact plate portion 14B is bent obliquely downward toward the connection plate portion 13 side.

As shown in FIG. 7, the contact plate portion 14B of the reaction force receiving portion 14 elastically contacts the support pin 9,
The guide plate portion 1 is formed by the pressing reaction force N received from the support pin 9.
2 is pressed in the circumferential direction (rotation direction) of the disc 1 toward the torque receiving portions 4 and 5 of the calipers 2 and 3, and the pad spring 10 is positioned with respect to the calipers 2 and 3 in the rotation direction of the disc 1. Has become.

The contact plate portion 14B of the reaction force receiving portion 14 is provided with pin guide plate portions 14C, 14C projecting from both sides in the width direction (axial direction of the disk 1). The pin guide plate portion 14C extends obliquely toward the connecting plate portion 13 in the direction of rotation of the disk 1 and, when the support pin 9 is mounted, as described later, connects the support pin 9 to the contact plate portion 1.
The guide is directed toward the contact surface 14B1 of the 4B.

Reference numerals 20 and 20 denote outer pad pressing portions integrally formed on the other end side of the guide plate portion 12 on the outer side in the radial direction of the disk 1. The outer pad pressing portion 20 is the other end of the guide plate portion 12. A first plate portion 20A extending radially outward from the disk 1 and opposite to the disk 1 in the axial direction of the disk 1;
A second plate portion 20B extending inward in the radial direction of the disk 1 from the opposite side to the guide plate portion 12 and opposite to the disk 1 in the axial direction of the disk 1;
A third plate portion 20C slightly extending from the opposite side of the plate portion 20B to the first plate portion 20A in the radial direction of the disk 1 and toward the disk 1 in the axial direction of the disk 1, and a third plate portion 20C; It has a substantially V-shape comprising a fourth plate portion 20D slightly extending from the opposite side to the two plate portions 20B in the radial direction of the disk 1 and slightly opposite to the disk 1 in the axial direction of the disk 1.

As shown in FIG. 10, the outer pad pressing portion 20 elastically abuts on the fourth plate portion 20D outside the lining 7 of the back metal 8 of the friction pad 6 in the radial direction of the disk. 6 is pressed in a direction away from the disk 1 with a pressing force F2 along the axial direction of the disk 1.

Incidentally, reference numerals 15 and 16 denote caliper 2 on the outer side.
And a fastening bolt for integrally fastening the inner caliper 3 and the inner caliper 3.

The opposing piston type disk brake according to the present embodiment has the above-described configuration. Next, the operation thereof will be described.

First, when the driver performs a brake operation,
The pistons provided on the calipers 2 and 3 slide toward the disk 1 by the brake fluid pressure from the outside, and accordingly, the friction pads 6 move along the support pins 9 fixed between the calipers 2 and 3 to move the disk 1. The guide plate portion 12 of the pad spring 10 provided on the torque receiving portions 4 and 5 while being guided in the axial direction.
Slide along. As a result, the friction pads 6 and 6 are pressed against both surfaces of the disc 1 to apply a braking force to the disc 1.

In this embodiment, the guide plate 12 of the pad spring 10 has an inner pad pressing portion formed by bending the distal end of the guide plate 12 obliquely at an angle substantially corresponding to the inclination angle θ. 11 are integrally formed, and the inner pad pressing portion 11 is configured to elastically contact the inclined surface portion 8A provided on the back metal 8 of the friction pad 6.

As a result, the pressing force F1 from the inner pad pressing portion 11 is applied to the friction pad 6 by the pressing force f1 in the radial direction of the disk 1, the pressing force f2 in the rotating direction of the disk 1, and the axial direction of the disk 1. And three components, namely, the pressing component f3.

Thus, in this embodiment, the peripheral wall of the pin hole 8B of the friction pad 6 is elastically moved toward the support pin 9 fixed between the calipers 2 and 3 by the pressing force f1 from the inner pad pressing portion 11. The pin holes 8 of the friction pad 6 can be pressed.
B is prevented from rattling with the support pin 9 in the radial direction of the disc 1, and abnormal noise such as rattling noise is generated between the pin hole 8 B of the friction pad 6 and the support pin 9 during running. be able to.

Further, the friction pad 6 is separated from the pad spring 10 by the pressing force f2 from the inner pad pressing portion 11.
Can be elastically pressed toward the guide plate portions 12 (torque receiving portions 4 and 5) of the disk 1 to prevent the friction pad 6 from rattling between the guide plate portions 12 and 12 in the rotation direction of the disc 1 and to prevent the friction pad 6 from being operated during a brake operation or the like. It is possible to prevent generation of abnormal noise such as a clonk noise between the friction pad 6 and the guide plate portion 12.

Further, the driver releases the brake operation,
When the pistons provided on the calipers 2 and 3 release the pressing of the friction pad 6 in the direction of the disk 1, the inner pad pressing portion 11 of the pad spring 10 abutting the friction pad 6 on the inner side in the disk radial direction moves to the corresponding contact position. That is, the inner position of the friction pad 6 in the disk radial direction is
The disc 1 is pressed by a pressing force f3 along the axial direction of the disc 1.
Is pressed in a direction away from in the axial direction.

At the same time, the outer pad pressing portion 20 of the pad spring 10 abutting on the friction pad 6 in the radial direction of the disk moves the corresponding contact position, that is, the outer position of the friction pad 6 in the disk radial direction, to the axis of the disk 1. The disc is pressed in a direction away from the disc 1 in the axial direction by a pressing force F2 along the direction. That is, both the inner side and the outer side of the friction pad 6 in the radial direction of the disk are pressed by the inner pad pressing portion 11 and the outer pad pressing portion 20 in a direction away from the disk 1 in the axial direction.

Therefore, even if the friction pad 6 does not slide smoothly with respect to the pad spring 10 due to, for example, a change in the surface properties, both the inside and the outside of the friction pad 6 in the disk radial direction can be separated from the disk 1. it can.

Therefore, it is possible to prevent the inside of the friction pad 6 in the disk radial direction from being dragged by the disk 1, and it is possible to prevent uneven wear generated on the friction pad 6.

The inner pad pressing portion 11 has a tongue piece 11 which extends obliquely from the tip of the folded plate portion 11B.
D, and the tongue piece 11D is attached to the wall surface 2 of the calipers 2 and 3.
D1 and 3D1 are elastically contacted with each other. Therefore, even when a large torque from the disc 1 via the friction pad 6 becomes a load and is applied to the inner pad pressing portion 11 during the brake operation, this load is applied. The tongue piece 11D can be received between the wall surfaces 2D1 and 3D1 of the calipers 2 and 3, and the inner pad pressing portion 11 can be used as in the prior art described above.
Is not pushed back inward in the radial direction.

Thus, the friction pad 6 is connected to the support pins 9 and
9 and the inner pad pressing portions 11, 11
D and 11D, the disk 1 can be supported at a total of four points in the radial direction, the posture of the friction pad 6 can be stabilized, and the sliding characteristics of the friction pad 6 can be kept good. Generation of abnormal noise with the pad spring 10 can be suppressed more reliably.

On the other hand, in the present embodiment, the reaction force receiving portion 14 provided in the middle of the connecting plate portion 13 of the pad spring 10 is
Since the support pin 9 is configured to be elastically contacted with the support pin 9, the reaction force N from the support pin 9 received by the reaction force receiving portion 14 causes the guide plate portion 12 to move the calipers 2 and 3 in the radial direction of the disk 1. It can be pressed against the receiving portions 4 and 5.

Therefore, according to the present embodiment, the pad spring 10 can be positioned in the rotation direction of the disc 1 with respect to the calipers 2 and 3, and the pad spring 10 can be positioned between the torque receiving portions 4 and 5 and the friction pad 6. It is possible to prevent rattling. When the brake is operated, the pad spring 10 is prevented from moving toward the friction pad 6 so as to protrude in the rotation direction of the disc 1.
It is possible to prevent the generation of abnormal noise such as rattling between 0 and
The sliding characteristics of the friction pad 6 can be further improved, and brake dragging can be prevented.

When the friction pad 6 is replaced, the support pin 9 is removed from the calipers 2 and 3 in advance, and in this state, the friction pad 6 is removed so as to be removed from between the pair of pad springs 10 and 10. Then, the new friction pad 6 is replaced with the one shown in FIG.
As shown by the arrow A in the figure, the disk 1 is inserted by inserting it between the pad springs 10 and 10 in the radial direction of the disk 1 and attached. Finally, the support pins 9 are turned into the calipers 2 and 3 in FIG. As shown by the arrow B shown in FIG.

In the present embodiment, the base end side of the guide plate portion 12 of the pad spring 10 which is located on the opening side of the pad accommodating recesses 2B, 3B is connected to the bent plate portion 14A of the reaction force receiving portion 14. Is bent to the opposite side to form the pad guide projection 12
Since the friction pad 6 is formed between the pad springs 10 as described above, the friction pad 6 can be guided inward in the radial direction of the disk 1 by the pad guide projections 12B when the friction pad 6 is mounted between the pad springs 10 as described above. Assembly work can be performed easily.

The contact plate 14B of the reaction force receiving portion 14 of the pad spring 10 has pin guide plates 14C, 14C protruding on both sides in the width direction. When the support 9 is inserted into the calipers 2 and 3 in the axial direction, the support pin 9 can be guided by the pin guide plate portion 14C toward the contact surface 14B1 of the contact plate portion 14B. Can be easily performed.

Further, the pad spring 10 makes the tongue piece 11D, the hook plate 13A and the hook projection 12A abut against the calipers 2 and 3, and the reaction force receiving portion 14 is supported by the support pin 9
, The pad spring 10 can be positioned with respect to the calipers 2 and 3 in the radial direction, the axial direction, and the rotation direction of the disc 1. Therefore, when the friction pad 6 is replaced, the pad spring 10 is moved to the caliper 2. , 3 can be replaced, and the work of attaching and detaching the pad spring 10 together with the friction pad 6 can be eliminated, and the overall workability can be improved.

Although the embodiment has been described as applying the disc brake to a vehicle, it may be specifically applied to a vehicle such as an automobile or a transportation vehicle.

[0060]

As described above in detail, according to the present invention, the pad spring contacts the friction pad in the radial direction of the disk and presses the friction pad in the direction away from the disk in the axial direction. And an inner pad pressing portion that abuts on the inner side of the friction pad in the disk radial direction and presses the friction pad in a direction away from the disk in the axial direction, so that the inner pad pressing portion and the outer pad pressing portion are provided. Thereby, both the inner side and the outer side of the friction pad in the disk radial direction are pressed in a direction away from the disk in the axial direction. Therefore, even if the friction pad does not slide smoothly with respect to the pad spring due to a change in surface properties, for example, both the inside and the outside of the friction pad in the disk radial direction can be separated from the disk.

Accordingly, it is possible to prevent the inside of the friction pad in the disk radial direction from being dragged by the disk, and it is possible to prevent uneven wear of the friction pad.

[Brief description of the drawings]

FIG. 1 is a front view of a disc brake according to an embodiment of the present invention.

FIG. 2 is a plan view of the disc brake according to the embodiment.

FIG. 3 is a bottom view showing the disk brake according to the embodiment in a partially broken state.

FIG. 4 is a longitudinal sectional view showing an out-side caliper together with an out-side friction pad.

5 is a cross-sectional view showing a state in which a friction pad is removed from a caliper, a pad spring, and the like in a direction indicated by an arrow VV in FIG. 1;

FIG. 6 is a sectional view similar to FIG. 5, but showing a state in which a pad spring is removed from a caliper.

FIG. 7 is an enlarged partial cross-sectional view showing the pad spring in FIG. 4 together with a friction pad and the like.

FIG. 8 is a side view showing the pad spring shown in FIG. 5 alone;

FIG. 9 is a front view showing the pad spring in FIG. 5 alone;

FIG. 10 is a front view showing the pad spring in FIG. 5 together with a friction pad and the like.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc 2, 3 Caliper 4, 5 Torque receiving part 6 Friction pad 8 Back metal 9 Support pin 10 Pad spring 11 Inner pad pressing part 20 Outer pad pressing part

Claims (1)

[Claims] 1. A caliper on an inner side and an outer side on which a pair of torque receiving portions are provided and disposed in a rotating direction of the disk with a pair of torque receiving portions provided therebetween, and slidable between the respective torque receiving portions of the caliper. Inner and outer friction pads supported by the piston and pressed against the surface of the disk by a piston, and inserted through the back metal of the friction pad provided between each of the calipers, whereby the friction pad is moved in the axial direction of the disk. And a pair of pad springs provided on each of the calipers separated from each other in the rotation direction of the disk to guide the friction pad along the torque receiving portion. The pad spring abuts the friction pad on the outer side in the disk radial direction to move the friction pad axially away from the disk. An outer pad pressing portion that presses the friction pad in a direction away from the disk, and an inner pad pressing portion that contacts the inside of the friction pad in the disk radial direction and presses the friction pad in a direction away from the disk in the axial direction. Disc brake characterized by the above.