JP2003222171A - Disc brake - Google Patents

Abstract

(57) [Problem] To provide a disc brake capable of preventing the pad from being dragged due to the urging force of the extending portion of the pad spring. SOLUTION: A pad spring 14 extends inward in a disk radial direction from a locking portion 13 to a carrier, and a pad 1 is provided.
An extension portion 41 is provided on the inner side of the disk 5 in the radial direction and contacts the contact portion 51 to urge it at least outward in the disk radial direction, and the extension portion 41 is separated from the disk in the disk axial direction. The spring constant in the direction is set to be larger than the spring constant in the direction approaching the disk. When the pad 15 is pushed by the disk and moves in the direction away from the disk due to the pad facing position of the disk swinging outward in the axial direction during idling, the extension 41 has a large spring constant in this direction and is hardly deformed. 15 is easily slid with respect to the extension 41.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a disc brake suitable for use in a vehicle.

[0002]

2. Description of the Related Art Disc brakes include a carrier mounted on a non-rotating portion of a vehicle, pad springs locked on the carrier at locking portions, and pad pads on the carrier arranged on both sides in the axial direction of the disk. Some have a pair of pads slidably supported via a locking portion of a spring, and a caliper that presses the pair of pads against a disc to generate a braking force.

The conventional pad spring 100 has a shape shown in FIG. 9, and is an engaging portion 101 to the carrier and a radially inward direction of the engaging portion 101 from the engaging portion 101 (downward direction in FIG. 9). ) Is provided with an extension portion 104 that contacts the extension pad 102 in the disk radial direction at the contact portion 103 and urges it at least outward in the disk radial direction.

[0004]

By the way, in the above-mentioned disc brake, when the disc is wobbling, the pad facing position of the disc is swung outward in the axial direction when the disc idles (non-braking rotation). As a result, the pad 102 is pushed by the disc and moves in a direction away from the disc. However, the extension portion 104 of the pad spring 100 contacting the pad 102 may elastically deform and follow this. . As a result, when the swing of the disc facing position toward the outside of the pad in the axial direction of the disc becomes small, the pad 102 is returned in the direction close to the disc by the urging force (restoring force) of the extending portion 104 of the pad spring 100. Therefore, when the swinging position of the disc to the outside again reaches the pad facing position, the pad 1
The operation of 02 touching the disk and being pushed by it is repeated.

Due to the above, even when the brake is not applied, the pad comes into contact with the disk, so-called dragging of the pad occurs, and the torque due to such dragging acts as the rotational resistance of the wheel, which affects fuel consumption. Further, the pads contact the disk intermittently and repeatedly, resulting in uneven wear of the disk, and as a result, judder may be likely to occur during braking.

It is an object of the present invention to provide a disc brake capable of preventing the pad from being dragged due to the urging force of the extending portion of the pad spring.

[0007]

In order to achieve the above object, a disc brake according to a first aspect of the present invention is a carrier mounted on a non-rotating portion of a vehicle, and is locked to the carrier at a locking portion. Pad springs, a pair of pads slidably supported by the carrier via the locking portions of the pad springs arranged on both sides in the axial direction of the disc, and the pair of pads on the disc. A caliper for pressing the pad spring to generate a braking force, the pad spring extending inward in the disk radial direction from the engaging portion and contacting the pad radial inner side of the pad at the contact portion to at least the disk radius. An extension portion for urging outward in the direction, the extension portion being separated from the disc in the disc axial direction. The spring constant is characterized by being larger than the spring constant in a direction close to the disk.

Thus, the pad spring extends inward in the disk radial direction from the engaging portion of the pad spring so as to come into contact with the inside of the pad radial direction of the pad at the contact portion so as to urge it at least outward in the disk radial direction. In the extended portion, the spring constant in the direction away from the disc in the disc axial direction is set to be larger than the spring constant in the direction close to the disc. When the pad is pressed by the disk and moves in the direction away from the disk due to the pad facing position of the disk swinging outward in the axial direction (during braking rotation), the extension has a large spring constant in this direction and is difficult to deform. , The pad slides on the extension and moves in a direction away from the disc. Therefore, even if the swing of the disc facing position of the pad outward in the axial direction of the disc is reduced, the pad will not be returned in the direction of approaching the disc due to the urging force (restoring force) of the extended portion of the pad spring. Even if the outer swinging position of the disc comes to the pad facing position again, the state where the pad contacts the disc and is pushed by this does not occur again.

A disc brake according to a second aspect of the present invention is the disc brake according to the first aspect, wherein the extending portion comes into contact with the carrier when deformed in a direction away from the disc in the disc axial direction. It is characterized in that a contact portion for generating a biasing force is provided.

As described above, since the extending portion is provided with the abutting portion that abuts the carrier to generate an urging force when the disk is deformed in the direction away from the disk in the axial direction of the disk, the surface of the disk is covered. When the disc is pushed and the pad is pushed by the disc and moves away from the disc when the disc facing position swings outward in the axial direction when the disc is spinning (non-braking rotation), it causes the extension part to touch. Since the contact portion comes into contact with the carrier and is less likely to be deformed, the pad slides with respect to the extending portion and moves in a direction away from the disc. Therefore, even if the swing of the disc facing position of the pad outward in the axial direction of the disc is reduced, the pad will not be returned in the direction of approaching the disc due to the urging force (restoring force) of the extended portion of the pad spring. Even if the outer swinging position of the disc comes to the pad facing position again, the state where the pad contacts the disc and is pushed by this does not occur again.

According to a third aspect of the present invention, in the disc brake according to the second aspect, the abutting portion abuts a disc facing surface of the carrier.

Since the abutting portion provided on the extending portion abuts on the disc facing surface of the carrier in this manner, the abutting portion causes the abutting portion when the extending portion is deformed in the disc axial direction away from the disc. The biasing force can be reliably generated.

A disc brake according to a fourth aspect of the present invention is the disc brake according to any one of the first to third aspects, wherein the extension portion is provided with a space between the engaging portion and the contact portion.
It is characterized in that more than one bent portion is formed.

As described above, the extending portion is formed with one or more bent portions between the engaging portion and the contact portion, which causes surface wobbling of the disc to prevent the disc from idling (non-braking). When the pad is pressed by the disc and moves in the direction away from the disc by swinging the pad facing position of the disc outward (during rotation), the extension portion is particularly likely to be deformed in the disc axial direction. The effect of increasing the spring constant in the direction away from the disc in the axial direction from the spring constant in the direction close to the disc is enhanced.

A disc brake according to claim 5 of the present invention relates to the disc brake according to any one of claims 1 to 4,
A supporting concave portion that is recessed in the disc circumferential direction is formed on one of the carrier and the pad, and a convex portion that projects in the disc circumferential direction is formed on the other of the carrier and the pad, and The pad is supported by the carrier by the engagement of the convex portion with the support concave portion.

As described above, the support recess formed in the disk circumferential direction on either the carrier or the pad has the projection formed on the other side of the carrier or pad in the disk circumferential direction. Since the pad is supported by the carrier by the engagement, it is not necessary to support the pad radial direction of the pad only by the pad spring, and the load of the pad spring can be reduced. As a result, the frictional force between the pad and the extended part of the pad spring can be reduced, so that the disc wobbling causes the disc pad facing position to be axially outside when the disc idles (non-braking rotation). When the pad is pushed by the disc and moves in the direction away from the disc by swinging to, the pad slides more easily with respect to the extension portion and easily moves in the direction away from the disc.

The disc brake according to claim 6 of the present invention is the disc brake according to any one of claims 1 to 5, wherein the pad spring urges the pad in the opposite direction to the disc. And the return urging portion is provided at an intermediate position between the contact portion with the pad and the contact portion in the locking portion.

As described above, the pad spring has the return urging portion for urging the pad in the opposite direction with respect to the disk, and the contact position with the pad where a frictional force is generated in the engaging portion when the pad is returned, Since the return urging portion is provided at an intermediate position between the extension portion and the contact portion where frictional force is generated, the return urging portion does not tilt the pad with respect to the disc and returns it evenly inside and outside the disc radial direction. You can

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION A disk brake according to a first embodiment of the present invention will be described below with reference to FIGS. In the following description, the vehicle is placed in a normal position where it can be braked.

The disc brake 10 of the first embodiment is
As shown in FIG. 1, the disk 11 is arranged so as to straddle the outer side in the radial direction of the disk 11 in the axial direction of the disk 11 (see FIG.
In the direction perpendicular to the paper surface of FIG. 1), the circumferential direction (the left-right direction in FIG. 1), and the radial direction (the up-down direction in FIG. 1) so that the carrier 12 is attached to the non-rotating portion of the vehicle so as to be fixed in position. A pair of pad springs 14 that are locked to the carrier 12 at the locking portions 13 in a state of being spaced in the disk circumferential direction, and a pair of pad springs 14 that are arranged so as to sandwich the disk 11 on both sides in the axial direction of the disk 11. A pair of pads 15 slidably supported by the carrier 12 via the locking portions 13 of the pad springs 14 and slide pins (not shown) on the slide guide portions 16 at two positions of the carrier 12 are used for disc axial direction. Mainly composed of a caliper 17 which is supported so as to be slidable on the pad 15 and presses the pad 15 against the disc 11 from both outer sides to generate a braking force. Made a, is a so-called pin slide type.

The pair of pads 15 are both the disk 11
Has a lining 19 for contacting with each other to generate a frictional force, and a backing metal 20 for holding the lining 19 in a fixed state. The disc 1 is provided with the linings 19 facing each other.
1 on both sides in the axial direction.

The backing plate 20 has a mirror-symmetrical shape having projections 23 protruding on both sides in the disc circumferential direction. As shown in FIG. 2, the protrusions 23 extend along the disc axial direction (the direction orthogonal to the paper surface of FIG. 2) and along the disc circumferential direction (the left-right direction of FIG. 2) as well as the disc radial direction (the vertical direction of FIG. 2). Outside (Fig. 2
2) arranged along the disc axial direction and along the disc circumferential direction and inside (in the lower side in FIG. 2) in the disc radial direction, along the disc axial direction. And an end surface portion 26 arranged at an end portion in the disc circumferential direction. The end surface portion 26 is orthogonal to the surface portion 24 and the surface portion 25 which are parallel to each other. A loop-shaped return locking member 27 is fixed to each of the protrusions 23, which temporarily protrudes from the back metal 20 in the opposite direction to the lining 19 and then curves back toward the back metal.

As shown in FIG. 1, the carrier 12 is arranged so as to straddle the outer circumference of the disk 11 in the radial direction, and is separated from each other in the disk circumferential direction. A torque receiving portion 29 that temporarily extends inward in the disc radial direction on each side of the disc 11 in the disc axial direction from the respective end portions of these sliding guide portions 16; A connecting portion 30 for connecting members on the same side in the axial direction on the extending tip side.
And have.

Further, at the inner side of the torque receiving portion 29 in the disc circumferential direction, support concave portions 33 which are recessed one step in the disc circumferential direction are formed so as to extend in the disc axial direction. The elements 33 are arranged to face each other and are separated from each other in the disk circumferential direction.

As shown in FIG. 2, the support concave portion 33 is a surface portion 34 arranged along the disc axial direction and along the disc circumferential direction and on the outer side in the disc radial direction.
And a surface portion 35 arranged along the disc axial direction and along the disc circumferential direction and on the inner side in the disc radial direction, and a bottom surface portion 36 arranged between the surface portions 34, 35 along the disc axial direction. Have The bottom surface portion 36 is orthogonal to the surface portions 34 and 35 which are parallel to each other.

The pad spring 14, which guides the sliding of the pad 15 in the disc axial direction, has a mirror-symmetrical shape as shown in FIG. Pad spring 1
Reference numeral 4 denotes a connecting plate portion 38 having a long shape along the disc axial direction (X direction in FIG. 3), and both sides of the connecting plate portion 38 in the disc axial direction along the disc axial direction and the disc radial direction (see FIG. 3). Y direction)
Along the outer protruding plate portion 39 that protrudes inward in the disk radial direction along the inner side of the connecting plate portion 38 from the inner side in the disk radial direction between the outer protruding plate portions 39 to one side in the disk circumferential direction (Z direction in FIG. 3). The locking plate portions 40 that project while inclining, the locking portions 13 that are respectively provided inside the outer protruding plate portions 39 in the disk radial direction, and the entire locking portion 13 from the inner ends in the disk radial direction. As an extension portion 41 that extends inward in the disc radial direction, and a disc that protrudes outward in the disc circumferential direction from the end of each extension portion 41 on the opposite side to the disc and then extends once inward in the disc radial direction The return urging portion 42 has a shape that is folded back outward in the radial direction.

The locking portion 13 is bent outwardly in the radial direction of the disk so as to be recessed to the same side as the locking plate portion 39 in the disk circumferential direction. That is, the locking portion 13 is perpendicular to the outer projecting plate portion 39 and extends along the disc axial direction and the disc circumferential direction.
A plate portion 47 extending to the same side (that is, the opposite side to the pad 15), a plate portion 48 extending from the inside of the plate portion 47 in the disk radial direction in parallel with the plate portion 47, and these plate portions 47. , 48, and a bottom plate portion 49 provided along the disc axial direction. The bottom plate portion 49 is the plate portion 4
7 and the plate portion 48 are orthogonal to each other.

The extending portion 41 is an inwardly projecting plate portion 45 extending inward in the disc radial direction from the end of the engaging portion 13 on the disc radial direction inner side along the disc axial direction and along the disc radial direction. The inner protruding plate portion 45 has an urging plate portion 46 extending inward in the disc radial direction while inclining to the opposite side from the locking plate portion 39 in the disc circumferential direction from the disc radial direction inner side.

The inner projecting plate portion 45 contacts the side surface of the pad 15 in the disk circumferential direction and guides the sliding of the pad 15 in the disk axial direction.
Mainly introduces the braking torque to the torque receiving portion 29 via the inner protruding plate portion 45.

The urging plate portion 46 extends in a state of being separated from the carrier 12 and contacts the inner side of the pad 15 in the disk radial direction with the contact portion 51 on the extending front end side so as to attach it to the outer side in the disk radial direction. Energize. In addition, in the extension part 41,
In order to form the biasing plate portion 46, the contact portion 51 and the locking portion 1
A plurality of bent portions 52 are formed between the bent portions 52 and 3.

When the pad spring 14 is fitted into the support recess 33 of the carrier 12 at the engaging portion 13, its movement in the disk radial direction with respect to the carrier 12 is restricted, and at the inner protruding plate portion 45 thereof. By contacting the carrier 12 and the pad 15, movement of the carrier 12 in the disc circumferential direction is restricted, and further, the locking plate portion 40 is engaged between the torque receiving portions 29 separated from each other in the disc axial direction of the carrier 12. By being stopped, the movement in the disc axial direction is restricted, and the disc 12 is attached to the carrier 12. The pad springs 14 are provided on both sides of the carrier 12 in the disk circumferential direction.
Are attached facing each other.

In this way, the convex portions 23 on both sides are inserted into the bent concave engaging portions 13 of the pair of pad springs 14 mounted on both sides of the carrier 12 in the disk circumferential direction, so that the pads 15 form the pad springs 14. Will be supported by. At this time, the pad 15 is urged outward in the disc radial direction by the urging plate portion 46 of the extending portion 41 of the pad spring 14. Due to this urging, the pad 15 causes the surface portion 2 of the convex portion 23 on the outer side in the disk radial direction.
4 contacts the plate portion 47 of the locking portion 13 of the pad spring 14. As a result, the pad 15 comes into contact with the plate portion (contact position) 47 of the pad spring 14 and the contact portion 51 of the extending portion 41 in the disc radial direction.

Further, the tip end side of the return urging portion 42 is inserted into the return locking member 27 attached to the convex portion 23 of the pad 15. As a result, the pad 15 can be biased in the opposite direction to the disk 11 by the biasing force of the return biasing portion 42.

The pads 15 are supported by the pad springs 14 on both sides in the disc circumferential direction so that a pair of pads 15 are arranged on both sides in the axial direction of the disc 11.

In the first embodiment, the discs 14 extend inward in the disc radial direction from the ends on the side of the disc 11 at an intermediate position in the extending direction of the urging plate portions 46 of both the extending portions 41 of the pad spring 14. An abutting portion 55 extending substantially parallel to 11 is formed.

When the pad spring 14 is attached to the carrier 12, the contact portion 55 is parallel to the disc 11 of the connecting portion 30 of the carrier 12 on the opposite side of the disc 11 as shown in FIG. The disk facing surface 56 is disposed so as to face and abut. It should be noted that there may be a slight gap between the contact portion 55 and the disk facing surface 56 as long as it is smaller than the amount of movement of the pad due to surface wobbling of the disk.

As described above, in the state where the pad spring 14 is attached to the carrier 12, the contact portion 55 is formed.
When the extending portion 41 provided therewith is not elastically deformed in the disc axial direction and is deformed in the direction away from the disc 11, the extended portion 41 contacts the disc facing surface 56 of the carrier 12 on the opposite side of the disc 11. Contact and generate a biasing force.

On the other hand, the extending portion 41 is shaped so as not to contact the surface of the carrier 12 opposite to the disk facing surface 56.

Since the contact portion 55 is formed as described above, the extension portion 41 has a larger spring constant in the direction away from the disc 11 in the disc axial direction than the spring constant in the direction close to the disc 11. It is set.

Further, in the radial direction of the disk, the pad of the return urging portion 42 is located at an intermediate position between the plate portion 47 of the locking portion 13 of the pad spring 14 and the contact portion 51 of the extending portion 51 which come into contact with the pad 15. A contact position with 15 is provided.

The caliper 17 extends from the cylinder portion (not shown) opposite the disk 11 of one pad (not shown) to the opposite side, and extends from one side of the cylinder portion across the outer peripheral portion of the disk 11. It has a disc path portion 60 and a claw portion 61 which is arranged opposite to the cylinder portion of the disc path portion 60 from the side opposite to the disc 11 of the other pad 15.

The cylinder portion is provided with a bore (not shown) having a circular cross section so as to open toward the disk 11, and a piston (not shown) is slidably fitted in the bore. There is. This piston presses one pad (not shown), and the claw portion 61 presses the other pad 15 by the reaction force generated by the pressing of the piston, and as a result, the caliper 17 pushes both pads 15 together. The disc 11 is pressed from the outside.

According to the disc brake 10 of the first embodiment described above, the locking portion 13 of the pad spring 14 is provided.
From the extending portion 41 provided so as to extend inward in the disc radial direction from the pad 15 and to contact the inner side of the pad 15 in the disc radial direction at the contact portion 51 to urge the pad 15 at least outward in the disc radial direction. Since 55 is provided, the spring constant in the direction away from the disc 11 in the axial direction of the disc is set to be larger than the spring constant in the direction closer to the disc 11. When (non-braking rotation)
When the pad 15 of the disk 11 is swung outward in the axial direction and the pad 15 is pushed by the disk 11 and moves away from the disk 11, the extending portion 41
Since the spring constant in this direction is large and it is difficult to deform,
The pad 15 slides on the extending portion 41 and moves in a direction away from the disk 11. Therefore, even if the deflection of the disc 11 facing the pad toward the outer side in the disc axial direction becomes small, the pad 15 is returned in the direction approaching the disc 11 by the urging force (restoring force) of the extending portion 41 of the pad spring 14. Even if the outer swinging position of the disk 11 comes to the pad facing position again, the pad 1
The situation in which 5 contacts the disk 11 and is pushed by it will not occur again.

Therefore, it is possible to prevent the pad 15 from being dragged due to the biasing force of the extending portion 41 of the pad spring 14.

Moreover, since the contact portion 55 for contacting the carrier 12 to generate the urging force may be provided in the extension portion 41, the extension portion 41 of the pad spring 14 has a simple structure.
It is possible to prevent the pad 15 from being dragged due to the urging force of the pad.

Further, the contact portion 5 provided on the extending portion 41
Since 5 abuts on the disk facing surface 56 of the carrier 12 parallel to the disk 11, when the extending portion 41 is deformed in the direction away from the disk 11 in the disk axial direction, the abutting portion 55 reliably generates an urging force. Can be made.

In addition, since the extending portion 41 does not abut on the opposite side of the carrier 12 to the disk 11, the spring constant in the direction away from the disk 11 in the disk axial direction is set to the spring constant in the direction close to the disk 11. It can be easily set larger than the constant.

Further, at the extending portion 41, one or more bent portions 52 are formed between the locking portion 13 and the contact portion 51, so that the disk 11 is wobbling and the disk 11 is idling. When the pad 15 is pushed by the disk 11 and moves in the direction away from the disk 11 by swinging the pad facing position of the disk 11 to the outside in the axial direction during non-braking rotation, Since it is particularly easy to deform in the direction, the effect of increasing the spring constant in the direction away from the disk 11 in the disk axial direction from the spring constant in the direction close to the disk 11 is enhanced.

Further, a support recess 33 is formed in the carrier 12 so as to be recessed in the disk circumferential direction, and a projection 23 is formed in the pad 15 so as to project in the disk circumferential direction. The support recess 33 and the projection 23 are engaged with each other. Since the pads 15 are supported by the carrier 12 by the combination, it is not necessary to support the load of the pads 15 in the disk radial direction only by the pad springs 14, and the load of the pad springs 14 can be reduced. As a result, the frictional force between the pad 15 and the extended portion 41 of the pad spring 14 can be reduced, so that the disk 11 has surface wobbling and the pad of the disk 11 is rotated when the disk 11 idles (non-braking rotation). When the pad 15 is pushed by the disc 11 and moves in a direction away from the disc 11 due to the facing position swinging outward in the axial direction,
The pad 15 slides more easily with respect to the extending portion 41 and easily moves in the direction away from the disk 11.

Therefore, it is possible to reliably prevent the pad 15 from being dragged due to the urging force of the extending portion 41 of the pad spring 14.

In addition, the pad spring 14 has a return urging portion 42 for urging the pad 15 in the opposite direction with respect to the disk 11, and the pad 15 and the pad 15 which generate a frictional force at the time of returning the pad. Plate part 4 which is the contact position of
7 and the contact portion 51 of the extension portion 41 where a frictional force is generated, the contact portion of the return urging portion 42 to the pad 15 is provided at the intermediate position.
Can be returned evenly inside and outside the disk radial direction without tilting with respect to the disk 11.

In the above description, the support recess 33 is formed in the carrier 12 by recessing it in the disk circumferential direction, and the projection 23 is formed in the pad 15 by projecting it in the disk circumferential direction. The case of supporting 15 on the carrier 12 has been described as an example. However, the support recess is formed by recessing the pad 15 in the disc circumferential direction, and the projecting part is formed on the carrier 12 by projecting in the disc circumferential direction. Of course, it can be applied to the case where the pad 15 is supported on the carrier 12 by combining them.

Next, a second embodiment of the disc brake of the present invention will be described below with reference to FIGS. 5 and 6 focusing on the differences from the first embodiment. The same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the disc brake of the second embodiment, the intermediate predetermined range in the disc axial direction is opposite to the disc 11 at the intermediate position in the extending direction of the urging plate portions 46 of both extending portions 41 of the pad spring 14. It has an abutting portion 65 formed by cutting and raising in an inclined state so as to be closer to the inner side in the disk radial direction. On the other hand, on the disk 11 side of the connecting portion 30 of the carrier 12 on the outer side in the disk radial direction, a stepped portion 66 for arranging the contact portion 65 is formed.

When the pad spring 14 is attached to the carrier 12, the contact portion 65 is
Is the carrier 12 on the opposite side of the disk 11.
The tip portion of the stepped portion 66 of the connecting portion 30 is disposed so as to face the disc facing surface 67 parallel to the disc 11.

As described above, in the state where the pad spring 14 is attached to the carrier 12, the contact portion 65 is formed.
When the extending portion 41 provided therewith is not elastically deformed in the disc axial direction and is deformed in the direction away from the disc 11, the disc 11 of the connecting portion 30 of the carrier 12 on the opposite side of the disc 11 is formed. It abuts against the disk facing surface 67 parallel to and generates a biasing force.

On the other hand, the extending portion 41 is shaped so as not to contact the opposite side of the carrier 12 to the disk 11.

Since the contact portion 65 is formed as described above, the extension portion 41 has a spring constant close to the disc 11 in the direction of separating from the disc 11 in the disc axial direction, as in the first embodiment. The spring constant is set to be larger than the spring constant.

As a result, the disc brake of the second embodiment exhibits the same effect as that of the first embodiment.

Next, a third embodiment of the disc brake of the present invention will be described below with reference to FIGS. 7 and 8 focusing on the difference from the first embodiment. The same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The disc brake according to the third embodiment is located at an intermediate position in the extending direction of the inner projecting plate portions 45 of both extending portions 41 of the pad spring 14 and extends outward in the disc circumferential direction from the end portion on the disc 11 side. An abutting portion 70 that extends substantially parallel to the disk 11 is formed.

When the pad spring 14 is attached to the carrier 12, the abutting portion 70 is provided on the disc facing surface 71 parallel to the disc 11 of the torque receiving portion 29 of the carrier 12 on the opposite side of the disc 11. It is arranged to face each other.

As described above, in the state where the pad spring 14 is attached to the carrier 12, the contact portion 70 is formed.
Is a disc of the torque receiving portion 29 of the carrier 12 on the opposite side of the disc 11 when the extending portion 41 provided therewith is not elastically deformed in the disc axial direction and is deformed in the direction away from the disc 11. 11
It abuts against the disk facing surface 71 which is parallel to and generates a biasing force.

On the other hand, the extending portion 41 is shaped so as not to contact the opposite side of the carrier 12 to the disk 11.

Since the contact portion 70 is formed as described above, the extension portion 41 has a larger spring constant in the direction away from the disk 11 than the spring constant in the direction close to the disk 11 in the disk axis direction. It is set.

As a result, the disc brake of the third embodiment exhibits the same effect as that of the first embodiment.

The pad spring of the disc brake according to the third embodiment is protruded to the outer side in the disc radial direction by being slightly cut and raised from the intermediate portion in the disc axial direction to the outer side in the disc circumferential direction in the engaging portion 13. Has a protruding piece portion 72 that
The projecting piece 72 presses the locking portion 13 against the support recess 33 inward in the disk radial direction.

[0068]

As described in detail above, the first aspect of the present invention
According to the disc brake described above, the pad spring extends inward in the disc radial direction from the engaging portion of the pad spring so as to come into contact with the inner side of the pad in the disc radial direction at the contact portion and urge it at least outward in the disc radial direction. With respect to the provided extension part, the spring constant in the direction away from the disc in the disc axial direction is set to be larger than the spring constant in the direction close to the disc. (During non-braking rotation)
When the pad facing position of the disc swings outward in the axial direction and the pad is pushed by the disc and moves in the direction away from the disc, the extension part has a large spring constant in this direction, which makes it difficult for the pad to extend. It slides with respect to the projecting portion and moves in a direction away from the disc. Therefore, even if the swing of the disc facing position of the pad outward in the axial direction of the disc is reduced, the pad will not be returned in the direction of approaching the disc due to the urging force (restoring force) of the extended portion of the pad spring. Even if the outer swinging position of the disc comes to the pad facing position again, the state where the pad contacts the disc and is pushed by this does not occur again.

Therefore, it is possible to prevent the pad from being dragged due to the biasing force of the extending portion of the pad spring.

According to the disc brake of the second aspect of the present invention, the extending portion has the abutting portion for abutting against the carrier to generate an urging force when deformed in the direction away from the disc in the disc axial direction. Is provided, the surface wobbling of the disk causes the pad facing position of the disk to swing outward in the axial direction when the disk idles (non-braking rotation), and the pad is pushed by the disk and separated from the disk. When the pad moves in the direction, the extension portion is less likely to be deformed due to the contact portion coming into contact with the carrier, and thus the pad slides with respect to the extension portion and moves in the direction away from the disc. Therefore, even if the swing of the disc facing position of the pad outward in the axial direction of the disc is reduced, the pad will not be returned in the direction of approaching the disc due to the urging force (restoring force) of the extended portion of the pad spring. Even if the outer swinging position of the disc comes to the pad facing position again, the state where the pad contacts the disc and is pushed by this does not occur again.

Therefore, since it is sufficient to provide the extending portion with the contact portion that abuts the carrier to generate the urging force, the pad spring generated due to the urging force of the extending portion of the pad spring has a simple structure. It is possible to prevent dragging.

According to the disc brake of the third aspect of the present invention, since the abutting portion provided on the extending portion abuts the disc facing surface of the carrier, the extending portion is separated from the disc in the disc axial direction. The urging force can be reliably generated by the contact portion when deformed in the direction.

According to the disc brake of claim 4 of the present invention, one or more bent portions are formed between the engaging portion and the contact portion in the extending portion, and the disc wobbles. If the pad is pushed by the disc and moves in the direction away from the disc when the disc facing position swings outward in the axial direction when the disc is spinning (non-braking rotation), the extension part Since it is particularly easily deformed in the axial direction, the effect of increasing the spring constant in the direction away from the disc in the axial direction of the disc is greater than the spring constant in the direction close to the disc.

According to the disc brake of the fifth aspect of the present invention, the support recess formed in the disc circumferential direction is formed in either one of the carrier and the pad, and the disc circumferential is formed in the other of the carrier and the pad. Since the pad is supported by the carrier by the engagement of the projections formed to project in the direction, it is not necessary to support the pad radial direction of the pad only by the pad spring, and the load of the pad spring can be reduced. As a result, the frictional force between the pad and the extended part of the pad spring can be reduced, so that the disc wobbling causes the disc pad facing position to be axially outside when the disc idles (non-braking rotation). When the pad is pushed by the disc and moves in the direction away from the disc by swinging to, the pad slides more easily with respect to the extension portion and easily moves in the direction away from the disc.

Therefore, it is possible to reliably prevent the pad from being dragged due to the urging force of the extending portion of the pad spring.

According to the disc brake of claim 6 of the present invention, the pad spring has a return urging portion for urging the pad in the opposite direction to the disc, and when the pad is returned, the friction at the engaging portion is generated. The return biasing part is provided at an intermediate position between the contact position with the pad where the force is generated and the contact part where the frictional force is generated in the extension part. It is possible to return evenly inside and outside the disk radial direction.

[Brief description of drawings]

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

FIG. 2 is a partially enlarged front view showing a main part of the disc brake according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a pad spring of the disc brake according to the first embodiment of the present invention.

FIG. 4 is a partial side sectional view showing a pad spring and a carrier of the disc brake according to the first embodiment of the present invention.

FIG. 5 is a perspective view showing a pad spring of a disc brake according to a second embodiment of the present invention.

FIG. 6 is a partial side sectional view showing a pad spring and a carrier of a disc brake according to a second embodiment of the present invention.

FIG. 7 is a perspective view showing a pad spring of a disc brake according to a third embodiment of the present invention.

FIG. 8 is a partial front sectional view showing a pad spring and a carrier of a disc brake according to a second embodiment of the present invention.

FIG. 9 is a perspective view showing a pad spring of a conventional disc brake.

[Explanation of symbols]

10 disc brakes 11 discs 12 career 13 Locking part 14 Pad spring 15 pads 17 calipers 23 Convex part 33 Support recess 41 Extension 42 Return Energizer 51 contact part 52 Folding section 55 Contact part 56,67 Disc facing surface

Claims (6)

[Claims] 1. A carrier attached to a non-rotating portion of a vehicle, a pad spring locked to the carrier at a locking portion, and a pad spring attached to the carrier in a state of being arranged on both sides in the axial direction of the disk. The pad spring includes a pair of pads slidably supported via the locking portion, and a caliper that presses the pair of pads against the disc to generate a braking force. In a disc brake, which extends inward in the radial direction and is provided inwardly in the disc radial direction of the pad, and in which the contact portion urges the pad radially outward in the disc radial direction, the extending portion comprises: The spring constant in the direction away from the disc in the disc axial direction is set to be larger than the spring constant in the direction close to the disc. Disc brake characterized the door. 2. The extension portion is provided with an abutting portion that abuts against the carrier and generates an urging force when deformed in a direction away from the disc in the disc axial direction. The disc brake according to claim 1. 3. The disc brake according to claim 2, wherein the abutting portion abuts a disc facing surface of the carrier. 4. The extended portion is formed with one or more bent portions between the locking portion and the contact portion, and the bent portion is formed. Disc brake as described. 5. A support concave portion that is recessed in the disc circumferential direction is formed on one of the carrier and the pad, and a convex portion that projects in the disc circumferential direction is formed on the other of the carrier and the pad. The disc brake according to claim 1, wherein the pad is supported by the carrier by engaging the convex portion with the support concave portion. 6. The pad spring has a return urging portion for urging the pad in the opposite direction with respect to the disc, and a contact position of the locking portion with the pad,
The disc brake according to any one of claims 1 to 5, wherein the return urging portion is provided at an intermediate position between the contact portion and the contact portion.