JPH0854033A - Disc brake device - Google Patents

Abstract

PURPOSE:To reduce weight, size, and a cost and to prevent the occurrence of one-sided wear and the jolt of an inner pad. CONSTITUTION:In a disc brake device 10, a torque transmission part 28 is arranged at an inner pad 18 and brought into contact with a piston 58. Thus, during brake, brake torque exerted on an outer pad 52 is transmitted from a cylinder 34 to a torque transmission part 28 through a piston 58 and transmitted to the torque receiving part 26 of an inner mounting 14 without being exerted on slide pins 30 and 32. This constitution eliminates a need to increase the strength of the slide pins 30 and 32 and the fixing part thereof and remarkably reduces weight, size, and a cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake device for braking a vehicle.

[0002]

2. Description of the Related Art Among disk brake devices having a structure in which a disk rotor is sandwiched between a pair of pads for braking,
A so-called pin slide type disc brake device is known (as an example, Japanese Utility Model Laid-Open No. 2-128833).

In this type of pin slide type disc brake device, a cylinder is slidably supported by a main pin fixed to the inner mounting, and a piston is accommodated in the cylinder. An inner pad is linked to this piston. Further, a bridge portion is extended to the cylinder so as to straddle the disc rotor, and a claw portion is formed at the tip of the bridge portion to support the outer pad. At the time of braking, the claw portion of the cylinder and the piston move so as to approach each other, thereby sandwiching the disc rotor between the inner pad and the outer pad and applying a braking force to the disc rotor. Further, when the brake is actuated, the inner pad is dragged in the same direction as the disc rotor rotates, so that the inner mounting is provided with a torque receiving portion that abuts against the end portion of the inner pad and holds it.

By the way, in such a conventional pin slide type disc brake device, the braking torque acting on the inner pad at the time of braking contacts the end portion of the inner pad and holds the inner torque (torque receiving portion). However, the braking torque acting on the outer pad is transmitted to the main pin via the cylinder (the claw portion and the bridge portion) and then acts on the inner mounting. Therefore, it is necessary to increase the strength of the main pin and the fixed portion thereof so as to cope with a case where a large braking torque acts on the outer pad. Therefore, inevitably the weight is increased and the physique is increased, which causes a high cost.

Further, in the conventional pin slide type disc brake device as described above, the braking torque acting on the inner pad during braking is directly transmitted to the inner mounting, but at this time, the end of the inner pad and the inner mounting are A rotation moment with the contact position (torque receiving portion) as the fulcrum is generated in the inner pad. For this reason,
A bending moment is generated in the inner pad due to this rotation moment, and the inner pad does not come into contact with the disk rotor in a parallel state (the surface pressure distribution is not uniform), causing uneven wear of the inner pad and stick-slip. Was the cause of.

On the other hand, in the conventional pin slide type disc brake device, a rotation moment around the main pin is generated in the cylinder by the braking torque of the outer pad that acts on the cylinder during braking. Further, due to the braking torque of the inner pad, a rotational moment is generated in the inner pad about the contact position (torque receiving portion) between the end portion of the inner pad and the inner mounting. Since these rotational moments fluctuate as the braking force changes, there is also a problem that the cylinder and inner pad are easily rattled (difficult to stabilize).

[0007]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention effectively utilizes the braking torque of the outer pad for the inner pad, thereby significantly reducing the weight and size without sacrificing the braking performance and reducing the cost. The purpose is to obtain a disc brake device that can reduce the occurrence of uneven wear and stick-slip of the inner pad, and also to prevent rattling of the cylinder and inner pad regardless of changes in the braking force. The aim is to obtain a disc brake device that can be prevented.

[0008]

A disc brake device according to a first aspect of the present invention supports an inner pad and an outer pad which are opposed to each other on both sides of a disc rotor, and which supports the inner pad and acts on the inner pad during braking. An inner mounting having a torque receiving portion that receives a braking torque, and a piston that presses the inner pad during braking are held, and an outer pad supporting portion that supports the outer pad and receives a braking torque that acts on the outer pad during braking, In a disc brake device constituted by a cylinder slidably supported by a slide pin fixed to an inner mounting, a torque for directly transmitting a braking torque acting on the cylinder to the inner pad via the piston or the cylinder. Transmission means It is characterized in that provided in the inner pad.

A disc brake device according to a second aspect of the present invention is the disc brake device according to the first aspect,
The inner mounting that supports the inner pad is
The end portion of the inner pad is supported on the upstream side in the rotation direction of the disk rotor.

A disc brake device according to a third aspect of the present invention supports an inner pad and an outer pad which are opposed to both sides of a disc rotor, and supports the inner pad,
An inner mounting having a torque receiving portion that receives a braking torque that acts on the inner pad during braking, and an outer pad that holds a piston that presses the inner pad during braking and that supports the outer pad and receives a braking torque that acts on the outer pad during braking. In a disc brake device including a cylinder having a supporting portion and slidably supported by a slide pin fixed to the inner mounting, in a disc brake device, the braking torque of the outer pad acts on the cylinder or the piston during braking, A first rotation moment around the slide pin generated in the cylinder or the piston and a second rotation moment around the torque receiving portion generated in the inner pad by the braking torque of the inner pad during braking are shared. The moment receiving means receives, is characterized in that the first moment is provided in the inner pad in larger position than the second moment.

[0011]

In the disc brake device according to the first aspect, the braking torque that acts on the inner pad during braking is transmitted to the torque receiving portion of the inner mounting. On the other hand, the braking torque that acts on the outer pad and is transmitted from the outer pad supporting portion to the cylinder is transmitted to the piston without being transmitted from the cylinder to the slide pin, and is further transmitted from the piston to the inner pad via the torque transmitting means. . Alternatively, the braking torque transmitted to the cylinder is directly transmitted to the inner pad via the torque transmission means without being transmitted from the cylinder to the slide pin.
That is, the braking torque that acts on the outer pad is transmitted from the inner pad (torque transmission means) to the torque receiving portion of the inner mounting without being transmitted to the slide pin.

Therefore, it is not necessary to increase the strength of the slide pin or its fixed portion so as to cope with the case where a large braking torque is applied as in the conventional case, and the slide pin only has to support the weight of the device. The weight and size can be greatly reduced, and design specifications of parts such as a slide pin can be loosened to reduce the cost.

Further, in the disc brake device according to the first aspect of the present invention, at the time of braking, the inner pad torque receiving portion is used as a fulcrum on the inner pad by the braking torque acting on the inner pad, so that the inner pad is on the leading side (the rotational direction of the disc rotor). A rotational moment is generated in the direction in which the upstream side) approaches the disk rotor. On the other hand, since the braking torque acting on the outer pad acts on the torque transmitting portion of the inner pad, the inner pad is in the opposite direction to the above-described rotation moment with the torque receiving portion as a fulcrum (the leading side of the inner pad is separated from the disc rotor). (Direction) rotational moment is generated. Therefore, both rotational moments cancel each other out, and a bending moment due to the rotational moment is less likely to occur in the inner pad, and the inner pad abuts the disk rotor in a parallel state (uniform surface pressure distribution). Therefore, uneven wear of the inner pad and occurrence of stick slip are reduced.

In the disc brake device according to the second aspect, the inner mounting that supports the inner pad is
The end portion of the inner pad is supported on the upstream side in the rotation direction of the disk rotor. That is, the inner mounting torque receiving portion is provided on the upstream side in the rotational direction of the disk rotor, and a tensile force acts during braking.

Here, at the time of braking, the trailing side of the inner pad (downstream side in the rotation direction of the disc rotor) is separated from the disc rotor with the torque receiving portion of the inner mounting being a fulcrum on the inner pad by the braking torque acting on the inner pad. Rotational moment in the direction of rotation is generated. On the other hand, since the braking torque acting on the outer pad acts on the torque transmitting means of the inner pad, the inner pad is in the opposite direction to the above-described rotation moment with the torque receiving portion as a fulcrum (the trailing side of the inner pad approaches the disc rotor). Rotational moment (in the direction of rotation) is generated. Therefore, both rotational moments cancel each other out,
A bending moment due to a rotation moment is less likely to be generated in the inner pad, and the inner pad comes into contact with the disc rotor in a parallel state (uniform surface pressure distribution). Therefore, uneven wear of the inner pad and occurrence of stick slip are reduced.

Further, in this case, since the inner mounting torque receiving portion is provided on the upstream side in the rotation direction of the disc rotor, the torque transmitting means of the inner pad is set to the trailing side of the inner pad (downstream side in the rotation direction of the disc rotor). By providing the torque arm portion, the moment arm length between the torque receiving portion and the torque transmitting means can be set large. Therefore, it is possible to efficiently generate a rotation moment on the inner pad with the torque receiving portion acting as a fulcrum, which is caused by the braking torque acting on the outer pad, and a large pressing force in the direction in which the trailing side of the inner pad approaches the disc rotor. Can be more efficiently applied to the inner pad, and the required rigidity of the inner pad can be reduced.

In the disc brake device according to the third aspect of the present invention, at the time of braking, the first rotational moment is generated around the slide pin in the cylinder or piston by the braking torque of the outer pad acting on the cylinder or piston. Further, the braking torque of the inner pad causes a second rotation moment around the torque receiving portion in the inner pad.

Here, the first rotation moment and the second rotation moment act together on the moment receiving means provided on the inner pad. Further, since the moment receiving means is provided at a position where the first moment is larger than the second moment, the inner pad consequently has a torque receiving portion (inner mounting).
In the direction (the direction of action of the first moment). Therefore, the rattling of the cylinder and the inner pad can be prevented regardless of the change in the braking force.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first embodiment of the present invention will be described below with reference to FIGS.
An example will be described.

Disc brake device 1 according to the first embodiment
In No. 0, the inner mounting 14 is arranged on the inner side of the vehicle so as to face the disc rotor 12 rotating with the wheels. The inner mounting 14 is formed with a pair of screw holes 16 and is fixed to the vehicle body by bolts (not shown).

An inner pad 18 is supported on the inner mounting 14. The inner pad 18 is
The friction material 20 and the disk rotor 12 rather than the friction material 20
The back plate 22 is formed integrally with a back plate 22 that is long in the direction of the disk rotor 12. The back plate 22 is arranged in parallel with the disk rotor 12.

On the back plate 22 of the inner pad 18, a contact portion 24 is formed at an end portion on the downstream side along the rotation direction (arrow X direction) of the disc rotor 12. This contact part 2
4 is opposed to the torque receiving portion 26 provided on the inner mounting 14 so as to be able to come into contact therewith. Similarly, on the back plate 22 of the inner pad 18, a torque transmission portion 28 as a torque transmission means is formed to project inward of the vehicle in the vicinity of the downstream end portion along the rotation direction of the disc rotor 12. ing. As shown in detail in FIG. 5B, the torque transmission portion 28 is formed in an arc shape in a front view,
It is located downstream of the piston 58, which will be described later, in the rotational direction of the disk rotor 12, and is in contact with the piston 58.

A slide pin 30 and a slide pin 32 are integrally fixed to the inner mounting 14. The slide pin 30 and the slide pin 32 are arranged parallel to each other from the inner mounting 14 toward the inside of the vehicle.

On the other hand, a cylinder 34 is arranged inside the vehicle of the inner mounting 14 (inner pad 18). The cylinder 34 has a pair of arm portions 36 and 38 extending in parallel with the disk rotor 12, and further the arm portion 3
Sleeves 40 and 42 are provided at the distal ends of 6 and 38. Guide holes 44, 46 of these sleeves 40, 42
The slide pin 30 and the slide pin 32 fixed to the inner mounting 14 are inserted into the inside with a predetermined clearance, whereby the cylinder 34
Is movable along the axial direction of the slide pin 30 and the slide pin 32 (direction contacting with and separating from the disc rotor 12) and is also slightly movable in the direction orthogonal to the axial line.

The inner pad 1 is attached to the cylinder 34.
The bridge portion 48 extends toward the outside of the vehicle at right angles to the plate surface of 8 (disc rotor 12).
8 and the outer pad 52 are covered from above. A claw portion 50 as an outer pad supporting portion is formed at the tip of the bridge portion 48 to support the outer pad 52. The outer pad 52 basically has the same structure as the inner pad 18, and a back plate 56 is integrally fixed to the friction material 54, and the claw portion 50 supports the vehicle outer side surface of the back plate 56 of the outer pad 52. It is configured to do.

On the other hand, inside the cylinder 34, the piston 5
8 is movably inserted and arranged via a seal 60 and a dust boot 62. The piston 58 has an opening-side annular surface facing the back plate 22 of the inner pad 18, and
The outer peripheral surface of the end portion on the opening side is in contact with the torque transmitting portion 28 of the inner pad 18 described above, whereby the back plate 22 can be pressed. Further, a retainer spring 64 is arranged between the piston 58 and the back plate 22, and holds the inner pad 18 (back plate 22) at a predetermined position of the piston 58.

An oil chamber 66 is provided between the piston 58 and the cylinder 34. The oil chamber 66 has an oil inlet 6
8 communicates with each other, and a brake hose (not shown) is connected to the oil inlet 68 to introduce brake oil during braking. Therefore, when the brake oil is introduced into the oil chamber 66, the piston 58 is moved toward the disc rotor 12 and presses the back plate 22 of the inner pad 18, and the inner pad 18 is pressed against the disc rotor 12 and the braking torque is increased. In addition to the movement of the piston 58, the cylinder 34 itself is moved in the direction away from the disc rotor 12, so that the claw portion 50 moves.
The back pad 56 of the outer pad 52 is pushed by being moved in the direction of 2, and the outer pad 52 is brought into pressure contact with the disc rotor 12 to generate a braking torque.

As described above, the disc brake device 10 according to the first embodiment is of a so-called pin slide type (piston floating type).

Next, the operation of the first embodiment will be described. In the disc brake device 10 having the above-described configuration, the oil chamber 66 is reduced and the cylinder 34 approaches the disc rotor 12 (the claw portion 50 separates from the disc rotor 12) in a normal state where the brake operation is not performed. Piston 58
Are separated (retracted) from the disc rotor 12. Therefore, a gap is formed between the inner pad 18, the outer pad 52 and the disc rotor 12, and the disc rotor 12 is not restrained.

On the other hand, when the brake is operated by operating a brake pedal (not shown), the brake oil is introduced into the oil chamber 66 through the oil inlet 68. As a result, the piston 58 is moved in the direction of the disc rotor 12 and presses the back plate 22 of the inner pad 18, and the inner pad 18 is pressed against the disc rotor 12 to generate a frictional force between them and the braking torque to the disc rotor 12. Works. Further, simultaneously with the movement of the piston 58, the cylinder 34 itself is moved in a direction away from the disc rotor 12, the claw portion 50 is moved in the direction of the disc rotor 12, and presses the back plate 56 of the outer pad 52, and the outer pad 52 is disc-shaped. The rotor 12 is pressed against the rotor 12 to generate a frictional force therebetween, and a braking torque acts on the disk rotor 12.

Here, in the disc brake device 10,
When the brake is operated, the inner pad 18 is the disc rotor 1
When the disc rotor 12 is pressed and dragged in the same direction as the disc rotor 12 rotates, the inner pad 18 (the back plate 2
The contact portion 24 of 2) contacts the torque receiving portion 26 provided on the inner mounting 14 to receive the torque. That is, the braking torque that acts on the inner pad 18 during braking is directly transmitted to the torque receiving portion 26.

On the other hand, when the brake is operated, the outer pad 52
Is pressed against the disc rotor 12 and dragged in the same direction as the disc rotor 12 rotates, the braking torque acting on the outer pad 52 is transmitted to the cylinder 34 via the claw portion 50 and the bridge portion 48. Cylinder 34 attempts to move with piston 58. Here, since the torque transmission portion 28 is formed in the inner pad 18 and the piston 58 is in contact with the torque transmission portion 28, the braking torque transmitted to the cylinder 34 is transmitted from the cylinder 34 to the slide pin 30 and the slide pin 30. Pin 32
Is transmitted to the inner pad 18 from the piston 58 via the torque transmission portion 28 without being transmitted to the inner pad 18. That is, the braking torque acting on the outer pad 52 is transmitted to the inner pad 18 (torque transmitting portion 28) without being transmitted to the slide pin 30 and the slide pin 32, and further, similarly to the above, the inner pad 18 (the back plate). Two
The contact portion 24 of 2) contacts the torque receiving portion 26 of the inner mounting 14 and is transmitted.

Therefore, it is not necessary to increase the strength of the slide pin 30 and the slide pin 32 or their fixed portions so as to cope with a case where a large braking torque is applied as in the conventional case, and the slide pin 30 and the slide pin 32 are not required. Need only support the own weight of the cylinder 34 and the like, and can be significantly reduced in weight and size. Further, the design specifications of the parts such as the slide pin 30 are loosened, and the cost can be reduced.

Further, in the disc brake device 10, as shown in FIG. 6B, at the time of braking, the torque receiving portion 26 of the inner mounting 14 is used as a fulcrum on the inner pad 18 by the braking torque F _i acting on the inner pad 18. A rotational moment M _i is generated in a direction in which the leading side of the inner pad 18 (the upstream side in the rotation direction of the disc rotor 12) approaches the disc rotor 12.

Therefore, as shown in FIG. 6A, the conventional inner pad 13 without the torque transmission portion 28 is provided.
At 0, the wear of the leading side of the inner pad 130 (the upstream side in the rotational direction of the disc rotor 12) is promoted, and uneven wear occurs.

On the other hand, in the disc brake device 10 according to the first embodiment, the inner pad 18 is provided with the torque transmitting portion 28, and the braking torque F _o acting on the outer pad 52 is the piston 58 as described above. Since the torque acts on the torque transmitting portion 28 of the inner pad 18 via the inner pad 18, the inner pad 18 is in a direction opposite to the rotation moment M _i about the torque receiving portion 26 as a fulcrum (the leading side of the inner pad 18 moves from the disc rotor 12 to A rotational moment M _{o (} in the direction of separation) is generated. Therefore, the rotation moment M _i and the rotation moment M _o cancel each other out, and the bending moment due to the rotation moment hardly occurs in the inner pad 18, and the inner pad 18 contacts the disk rotor 12 in a parallel state (uniformly). And the surface pressure distribution). For this reason, uneven wear of the inner pad 18 and occurrence of stick slip are reduced.

As described above, in the disc brake device 10 according to the first embodiment, not only the braking torque acting on the inner pad 18 at the time of braking but also the braking torque acting on the outer pad 52 is transmitted through the torque transmitting portion 28. Since it is transmitted from the pad 18 to the inner mounting 14, in other words, the braking torque is not transmitted via the slide pin 30 or the slide pin 32.
4, the slide pin 30 and the like can be significantly reduced in weight and size, and the design specifications of parts such as the slide pin 30 can be loosened to reduce the cost. .

The bending moment generated in the inner pad 18 can be reduced and the inner pad 18 and the disc rotor 1 can be reduced.
Since the surface pressure distribution between the inner pad 1 and
The uneven wear of No. 8 is prevented, and the life of the inner pad 18 is significantly lengthened (the inner pad 18 can be uniformly utilized up to its service limit). Furthermore, when the brake is applied, the inner pad 1
Since the bending moment generated in No. 8 is reduced, it is possible to significantly reduce the occurrence of stick slip resulting from this and prevent the "brake squeal phenomenon".

Further, since the bending moment is reduced, the force for pressing the inner pad 18 against the disc rotor 12 is the piston 58 and the cylinder 34 due to the brake hydraulic pressure.
It depends only on the force generated between them. Therefore, the braking torque can be controlled only by the brake hydraulic pressure (there is no other different factor for controlling the braking torque), the design of the disc brake device 10 with respect to the required performance is facilitated, and the degree of freedom in design is also increased. Expanding.

In the disc brake device 10 of the first embodiment, the retainer spring 64 is arranged between the piston 58 and the back plate 22 of the inner pad 18 to hold the inner pad 18 at a predetermined position of the piston 58. However, the retainer spring 64 may be omitted. That is, for example, like the inner pad 70 shown in FIG.
2 may be provided, and the inner pad 70 may be held at a predetermined position of the piston 58 by fitting the convex portion 72 into the groove 59 of the piston 58.

Further, in the disc brake device 10 according to the first embodiment, the torque transmitting portion as a torque transmitting means is provided in the vicinity of the downstream end portion of the back plate 22 of the inner pad 18 along the rotation direction of the disc rotor 12. Although the configuration is such that 28 is formed to project inward of the vehicle, the configuration of the torque transmission means is not limited to this. For example, a groove portion having the same shape as the contact surface of the piston 58 may be formed on the inner pad 18, and the piston 58 may be fitted in this groove portion. In addition, the piston 58 and the inner pad 18 are manufactured.
May be integrally formed.

In the first embodiment, the inner pad 18 is provided with the torque transmitting portion 28 only in the vicinity of the downstream end of the disc rotor 12 in the rotation direction. Not limited to, the inner pad 74 shown in FIG.
As shown in FIG.
It may be configured so that both the upstream side and the downstream side of 8 come into contact with each other. In this case, the braking torque can be transmitted from the inner pad 74 to the inner mounting 14 via the torque transmitting portion 78 not only when the vehicle is braking in the forward drive state but also when the vehicle is braking in the reverse drive state. Target.

Further, in the disc brake device 10 of the first embodiment, the bridge portion 48 extends from the cylinder 34 toward the outside of the vehicle to cover the inner pad 18 and the outer pad 52 from above, a so-called bridge type. However, the caliper is not limited to this and may have another configuration. For example, a so-called frame-type caliper having a structure in which the arms 82 and 84 are extended from both ends of the cylinder 34 as in the disc brake device 80 shown in FIGS. 9 and 10 is applicable. You can

Next, another embodiment of the present invention will be described. The parts that are basically the same as those in the first embodiment have the first
The same reference numerals as in the embodiment are given and the description thereof is omitted.

FIG. 11 is a schematic configuration diagram of the main part of the disc brake device 90 according to the second embodiment.

In this disc brake device 90, the inner pad 92 is supported by the inner mounting 14. On the back plate 94 of the inner pad 92, the locking portion 96 is provided at the upstream end portion along the rotation direction of the disc rotor 12.
Are formed. The locking portion 96 is locked to a torque receiving portion 98 provided on the inner mounting 14, and the braking torque acting on the inner pad 92 is applied to the inner mounting 14 as a pulling force.

The back plate 94 of the inner pad 92 includes
Similar to the first embodiment, the torque transmitting portion 100 is formed so as to project, and the disc rotor 12 is positioned more than the piston 58.
Is located on the downstream side in the rotation direction of and is in contact with.

In the disc brake device 90 having the above structure, when the inner pad 92 is pressed against the disc rotor 12 and is dragged in the same direction as the disc rotor 12 rotates during brake operation, the inner pad 92 (the back plate 94). The engaging portion 96 is engaged with the torque receiving portion 98 provided on the inner mounting 14 to receive the torque. That is, the braking torque that acts on the inner pad 92 during braking is directly transmitted to the torque receiving portion 98 as a pulling force.

When the brake is operated, the outer pad 52
Is pressed against the disc rotor 12 and dragged in the same direction as the disc rotor 12 rotates, the braking torque acting on the outer pad 52 is transmitted to the cylinder 34 via the claw portion 50 and the bridge portion 48. Cylinder 34 attempts to move with piston 58. Here, since the torque transmission portion 100 is formed on the inner pad 92 and the piston 58 is in contact with the torque transmission portion 100, the braking torque transmitted to the cylinder 34 is transmitted from the cylinder 34 to the slide pin 30 and the slide pin 30. It is transmitted from the piston 58 to the inner pad 92 via the torque transmitting portion 100 without being transmitted to the pin 32.
That is, the braking torque acting on the outer pad 52 is
It is transmitted to the inner pad 92 (torque transmission portion 100) without being transmitted to the slide pin 30 and the slide pin 32. Further, as described above, the engaging portion 96 of the inner pad 92 (back plate 94) causes the inner mounting 14 to move. The torque receiving portion 98 is engaged and transmitted.

Therefore, it is not necessary to increase the strength of the slide pin 30 and the slide pin 32 or the fixed portion thereof so as to cope with the case where a large braking torque is applied as in the conventional case, and the slide pin 30 and the slide pin 32 are not required. Need only support the own weight of the cylinder 34 and the like, and can be significantly reduced in weight and size. Further, the design specifications of the parts such as the slide pin 30 are loosened, and the cost can be reduced.

In the disc brake device 90, the inner mounting 14 that supports the inner pad 92 is also used.
Supports the locking portion 96 of the inner pad 92 on the upstream side in the rotation direction of the disc rotor 12. That is,
The torque receiving portion 98 of the inner mounting 14 is provided on the upstream side in the rotation direction of the disc rotor 12, and a tensile force acts during braking.

Here, as shown in FIG. 11 (B), at the time of braking, the braking torque F _i acting on the inner pad 92 causes the torque receiving portion 98 of the inner mounting 14 to serve as a fulcrum on the inner pad 92 for the tray of the inner pad 92. Rotational moment M in the direction in which the ring side (downstream side in the rotation direction of the disc rotor 12) separates from the disc rotor 12.
_i occurs.

Therefore, as shown in FIG. 11A, the conventional inner pad 1 without the torque transmitting portion 28 is provided.
At 30, wear on the leading side of the inner pad 130 (the upstream side in the rotational direction of the disc rotor 12) is promoted,
Uneven wear occurs.

On the other hand, in the disc brake device 90 according to the second embodiment, the inner pad 92 is provided with the torque transmission portion 100, and the braking torque F _o acting on the outer pad 52 is the inner pad as described above. Since it acts on the torque transmitting portion 100 of the motor 92, the rotation moment M about the torque receiving portion 98 as a fulcrum is provided on the inner pad 92.
_A rotational moment M _o opposite to _i (in the direction in which the trailing side of the inner pad 92 approaches the disc rotor 12) is generated. Therefore, the rotation moment M _i and the rotation moment M _o cancel each other out, so that a bending moment due to the rotation moment hardly occurs in the inner pad 92, and the inner pad 92 abuts the disk rotor 12 in a parallel state (uniformly). And the surface pressure distribution). Therefore, uneven wear of the inner pad 92 and occurrence of stick slip are reduced.

Further, in this case, the inner mounting 1
The torque receiving portion 98 of No. 4 is provided on the upstream side in the rotation direction of the disc rotor 12, and the torque transmitting portion 100 of the inner pad 92 is provided on the trailing side of the inner pad 92 (downstream side in the rotation direction of the disc rotor 12). Therefore, the moment arm length L between the torque receiving portion 98 and the torque transmitting portion 100 can be set large. Therefore, the rotation moment M _o about the torque receiving portion 98 caused by the braking torque F _o acting on the outer pad 52 can be efficiently generated in the inner pad 92, and the trailing side of the inner pad 92 is the disc rotor. A large pressing force in the direction of approaching can be more efficiently applied to the inner pad 92. Further, since the action points of the braking torque F _i acting on the inner pad 92 and the action points of the braking torque F _o are close to each other, the required rigidity of the back plate 94 of the inner pad 92 can be reduced, and the weight can be further reduced. It will be possible.

As described above, in the disc brake device 90 according to the second embodiment, not only the braking torque that acts on the inner pad 92 during braking but also the braking torque that acts on the outer pad 52 are transmitted through the torque transmitting portion 100. Since the power is transmitted from the pad 92 to the inner mounting 14, the slide pin 30 and the like can be significantly reduced in weight and size, and the design specifications of parts such as the slide pin 30 are loosened to reduce the cost. be able to. In addition, the bending moment generated in the inner pad 92 can be reduced, uneven wear of the inner pad 92 can be prevented, and the necessary rigidity of the back plate 94 can be reduced to further reduce the weight.

In the disc brake device 90 according to the second embodiment, the engaging portion 96 is formed only at the upstream end of the inner pad 92 (back plate 94) along the rotation direction of the disc rotor 12. The locking portion 96 is locked to the torque receiving portion 98 provided on the inner mounting 14 and the torque transmitting portion 100 is provided. However, the present invention is not limited to this, and the torque receiving portion 98 and the torque transmitting portion 100 are not limited thereto. May be provided at two locations.

That is, as in the disc brake device 102 shown in FIG. 12, the inner pad 104 (the back plate 106).
Locking portions 108 and 110 are formed at the upstream and downstream ends of the disk rotor 12 in the rotation direction of the disk rotor 12, respectively, and the inner portions corresponding to these locking portions 108 and 110 are formed. It is also possible to provide the torque receiving portion 112 and the torque receiving portion 114 at the upstream end and the downstream end of the mounting 14, respectively, and to provide the torque transmitting portion 116 and the torque transmitting portion 118 corresponding to the piston 58. . In this case, for example, the one locking portion 1
In the state where 08 is in contact with the torque receiving portion 112 in the pulling direction, the other locking portion 110 is set to be in a non-contact state with the torque receiving portion 114 (a state where a clearance exists).

In the disc brake device 102, the braking torque acting on the inner pad 104 is received by the torque receiving portion 112 when the vehicle is in the forward drive state, for example, and the inner pad 104 is applied when the vehicle is in the reverse drive state. The braking torque is received by the torque receiving portion 114, and it is possible to cope with any state, which is more effective.

Next, the disc brake device 120 according to the third embodiment will be described with reference to FIGS.

In this disc brake device 120, a back plate 124 of the inner pad 122 is formed with a moment receiving portion 126 as a moment receiving means. The moment receiving portion 126 projects toward the piston 58 and is in contact with the inner peripheral surface of the piston 58.

Further, as shown in FIG. 14, the braking torque F ₁ of the outer pad 52 acting on the piston 58 via the cylinder 34 during braking causes the cylinder 34 and the piston 58 to rotate about the slide pin 30 for the first rotation. A moment M ₁ is produced. Further, as shown in FIG. 15, the braking torque F ₂ of the inner pad 122 during braking causes
The inner pad 122 has a second portion around the torque receiving portion 128.
A rotation moment M _{2 of} is generated. The moment receiving portion 126 receives both the first rotation moment M ₁ and the second rotation moment M ₂ , and the first rotation moment M ₁ becomes larger than the second rotation moment M _2. The inner pad 122 is provided at a position.

In the disc brake device 120 according to the third embodiment, the braking torque F ₁ of the outer pad 52 acting on the cylinder 34 and the piston 58 during braking causes
In the cylinder 34 and the piston 58, the first rotation moment M ₁ is generated around the slide pin 30 as described above. Therefore, the force of F ₁ · (L ₁ / b ₁ ) acts downward on the moment receiving portion 126 formed on the inner pad 92. Further, the braking torque F ₂ of the inner pad 122
As a result, the second rotation moment M ₂ is generated in the inner pad 122 around the torque receiving portion 128 as described above. Therefore, the force of F ₂ · (L ₂ / b ₂ ) acts upward on the moment receiving portion 126 formed on the inner pad 122.

In the moment receiving portion 126, the first rotational moment M ₁ is the second rotational moment M ₂
As a result, the inner pad 122 is held by being pressed in the direction of the torque receiving portion 128 (inner mounting 14) (that is, the acting direction of the _first rotational moment M ₁ ). To be done.
Therefore, rattling of the cylinder 34 and the inner pad 122 is prevented regardless of changes in the braking force, and stable braking can be achieved.

In the disc brake device 120 according to the third embodiment, the cylinder 3 is normally operated (non-braking).
4 (the inner peripheral wall of the piston 58) is the moment receiving portion 126.
The cylinder 34 can be held only by the slide pin 30 and the slide pin 32 can be omitted by providing a holding spring or the like so as to abut.

As described above, in the disc brake device 120 according to the third embodiment, the second rotational moment M ₂ generated in the inner pad 122 is changed to the first rotational moment M generated in the outer pad 52 (the cylinder 34 and the piston 58). By canceling by ₁ , the rattling of the cylinder 34 and the inner pad 122 can be prevented and stable braking can be performed regardless of the change of the braking force.

In the disc brake device 120 according to the third embodiment, the moment receiving portion 126 as the moment receiving means contacts the inner peripheral surface of the piston 58,
Although the first rotation moment M ₁ generated during braking is applied to the moment receiving portion 126 via the piston 58, the present invention is not limited to this. The moment receiving portion 126 is provided so as to directly contact the cylinder 34, and braking is performed. The first rotational moment M ₁ generated at times may be directly applied from the cylinder 34 to the moment receiving portion 126.

In each of the embodiments described above, the present invention is a so-called pin slide type (piston floating type).
Although the example applied to the disc brake device 10, 90, 120 or the like has been described, the present invention is not limited to this and can be applied to other types.

[0069]

As described above, the present invention has the following effects. In the disc brake device according to the first aspect, the braking torque acting on the outer pad can be transmitted from the inner pad to the torque receiving portion of the inner mounting through the torque transmitting means without being transmitted to the slide pin. It is not necessary to increase the strength of the pin or its fixed portion, the weight and size can be greatly reduced, and the design specifications of parts such as the slide pin are loosened, and the cost can be reduced.

Further, since the rotation moment generated by the braking torque acting on the inner pad and the rotation moment generated by the braking torque acting on the outer pad cancel each other, the inner pad abuts in parallel with the disc rotor. As a result, a uniform surface pressure distribution can be obtained and uneven wear of the inner pad and stick-slip can be reduced.

In the disc brake device according to the second aspect, since the torque receiving portion of the inner mounting is provided on the upstream side in the rotation direction of the disc rotor, the torque transmitting means of the inner pad is set to the trailing side of the inner pad (disc rotor). It is possible to set a large moment arm length between the torque receiving portion and the torque transmitting means by providing the torque arm portion on the downstream side in the rotation direction. Therefore, it is possible to efficiently generate a rotation moment on the inner pad with the torque receiving portion acting as a fulcrum resulting from the braking torque acting on the outer pad, and to further increase the pressing force in the direction in which the trailing side of the inner pad approaches the disc rotor. The inner pad can be efficiently acted, and the required rigidity of the inner pad can be reduced.

In the disc brake device according to the third aspect, the first rotational moment around the slide pin generated in the cylinder and the piston cancels the second rotational moment around the torque receiving part generated in the inner pad. It is possible to prevent rattling of the cylinder and the inner pad regardless of changes in power and to perform stable braking.

[Brief description of drawings]

FIG. 1 is a transverse cross-sectional view showing the overall configuration of a disc brake device according to a first embodiment of the present invention.

FIG. 2 is a plan view of the disc brake device according to the first embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of the disc brake device according to the first embodiment of the present invention, taken along line 3-3 of FIG.

FIG. 4 is a front view of the disc brake device according to the first embodiment of the present invention.

FIG. 5 shows an inner pad used in the disc brake device according to the first embodiment of the present invention, (A) is a side view, and (B) is a front view.

FIG. 6 is a side view showing an inner pad used in the disc brake device according to the first embodiment of the present invention, in which (A) shows a state of uneven wear when the torque transmission portion is not provided, FIG. 6B is a side view showing the working relationship of the braking torque, and FIG. 7C is a front view showing the working relationship of the braking torque.

FIG. 7 is a side view showing a modified example of the inner pad used in the disc brake device according to the first embodiment of the present invention.

FIG. 8 is a front view showing a modified example of the inner pad used in the disc brake device according to the first embodiment of the present invention.

FIG. 9 is a plan view showing a modified example of the disc brake device according to the first embodiment of the present invention.

FIG. 10 is a front view showing a modified example of the disc brake device according to the first embodiment of the present invention.

FIG. 11 is a side view showing an inner pad used in a disc brake device according to a second embodiment of the present invention, in which (A) shows a state of uneven wear when a torque transmission portion is not provided, FIG. 6B is a side view showing the working relationship of the braking torque, and FIG. 7C is a front view showing the working relationship of the braking torque.

FIG. 12 is a front view showing a modified example of the inner pad and the inner mounting used in the disc brake device according to the second embodiment of the present invention.

FIG. 13 is a cross-sectional view showing the overall structure of a disc brake device according to a third embodiment of the present invention.

FIG. 14 is a sectional view of the essential part taken along line 14-14 of FIG. 13, showing a moment receiving portion of a disc brake device according to a third embodiment of the present invention.

FIG. 15 is a sectional view of a main part taken along line 15-15 of FIG. 13, showing a moment receiving part of a disc brake device according to a third example of the present invention.

[Explanation of symbols]

 10 disc brake device 12 disc rotor 14 inner mounting 18 inner pad 24 abutting portion 26 torque receiving portion 28 torque transmitting portion (torque transmitting means) 30 slide pin 32 slide pin 34 cylinder 50 claw portion (outer pad supporting portion) 52 outer pad 58 piston 90 disc brake device 92 inner pad 98 torque receiving part 100 torque transmitting part (torque transmitting means) 120 disc brake device 122 inner pad 126 moment receiving part (moment receiving means) 128 torque receiving part

Claims (3)

[Claims] 1. An inner pad and an outer pad which are opposed to each other on both sides of a disc rotor, an inner mounting having a torque receiving portion which supports the inner pad and receives a braking torque acting on the inner pad during braking, and A cylinder that holds a piston that presses the inner pad, has an outer pad support portion that supports the outer pad and receives a braking torque that acts on the outer pad during braking, and is slidably supported by a slide pin fixed to the inner mounting. A disc brake device comprising: a torque transmitting means for directly transmitting a braking torque acting on the cylinder to the inner pad via the piston or the cylinder. Blur Key equipment. 2. The disc brake device according to claim 1, wherein the inner mounting that supports the inner pad supports an end portion of the inner pad on an upstream side in a rotation direction of the disc rotor. 3. An inner pad and an outer pad which are opposed to each other on both sides of a disc rotor, an inner mounting having a torque receiving portion which supports the inner pad and receives a braking torque acting on the inner pad during braking, and A cylinder that holds a piston that presses the inner pad, has an outer pad support portion that supports the outer pad and receives a braking torque that acts on the outer pad during braking, and is slidably supported by a slide pin fixed to the inner mounting. And a first rotational moment around the slide pin generated in the cylinder or the piston by the braking torque of the outer pad acting on the cylinder or the piston during braking, and At the position where the first moment is larger than the second moment, the moment receiving means that receives both the second rotation moment around the torque receiving portion generated in the inner pad by the braking torque of the inner pad is set at a position where the first moment is larger than the second moment. A disc brake device provided on the inner pad.