JP2007107691A - Opposed type disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an opposed type disc brake with a structure capable of effectively suppressing uneven wear of an outer pad. <P>SOLUTION: The opposed type disc brake 1 has an inner pad provided closer to a vehicle side than a disc rotor R, an outer pad 6 provided closer to a vehicle outside than the disc rotor R and a caliper 2 extending from a member at the vehicle side over the disk rotor R in a rotor axis direction. The inner pad 5 is pressed to the disc rotor R by an inner piston provided in the caliper 2 and the outer pad 6 is pressed to the disk rotor R by an outer piston 4 provided in the caliper 2. The caliper 2 has an advance torque receive part 2i for restricting movement of the outer pad 6 to a rotor circumference direction at the time of advance braking, a retreat torque receive part 2j for restricting movement of the outer pad 6 to the rotor circumference direction at the time of retreating braking and a reinforcing part 2h for reinforcing the advance torque receive part 2i and the retreat torque receive part 2j by connecting them at a position closer to a rotor center side than the outer pad 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an opposed disk brake used in various vehicles such as automobiles and motorcycles. More specifically, the present invention relates to a counter-type disc brake having a structure for suppressing uneven wear of an outer pad.

Conventionally, various opposed disc brakes are known.
As described in Patent Documents 1 and 2, the opposed disc brake includes an inner pad disposed on the vehicle side of the disc rotor, an outer pad disposed on the vehicle outer side of the disc rotor, and a member on the vehicle side. And a caliper straddling the disk rotor in the rotor axial direction. The opposed disc brake is configured such that the inner pad is pressed against the disc rotor by an inner piston provided in the caliper, and the outer pad is pressed against the disc rotor by an outer piston provided in the caliper.
JP 2005-1016187 A Japanese Utility Model Publication No. 7-12638

  However, as shown in FIGS. 7 and 8, the caliper 12 has bridge portions 12m and 12n straddling the disk rotor R, and the rigidity becomes lower as the distance from the bridge portions 12m and 12n increases. have. Therefore, when the pads (outer pad 16 and inner pad 15) are pressed against the disk rotor R by the pistons 13 and 14, the caliper 12 swells in the axial direction of the rotor due to the reaction force (see the phantom line in FIG. 7). , 12n increases as the distance increases. Further, since the caliper 12 has a mounting portion 12g attached to a member on the vehicle side on the inner side, the outer side has lower rigidity than the inner side. Therefore, the rotor radial direction center part on the outer side of the caliper 12 tends to swell most in the rotor axial direction.

Therefore, the caliper 12 is inclined on the outer side with respect to the disc rotor R, and the outer piston 14 provided on the outer side is inclined. Therefore, the outer pad 16 pressed against the disk rotor R by the outer piston 14 is pressed more strongly on the outer side in the rotor radial direction (upper side in FIG. 8) than on the central side in the rotor radial direction (lower side in FIG. 8). For this reason, the outer pad 16 is unevenly worn in the rotor radial direction.
Therefore, an object of the present invention is to provide a counter-type disc brake having a structure capable of effectively suppressing uneven wear of the outer pad.

In order to solve the above-mentioned problems, the present invention is an opposed disc brake having a configuration as described in each claim.
According to the first aspect of the present invention, the caliper includes a forward torque receiving portion that restricts movement of the outer pad in the rotor circumferential direction during forward braking, and a reverse drive that restricts movement of the outer pad in the rotor circumferential direction during reverse braking. It has a torque receiving part and a reinforcing part that connects and reinforces the forward torque receiving part and the reverse torque receiving part closer to the rotor center side than the outer pad.

  Therefore, the caliper is reinforced at the center side portion in the rotor radial direction outside the vehicle by the reinforcing portion. Therefore, the reinforcing portion can prevent the caliper from swelling in the rotor radial direction center side on the outer side of the vehicle due to the reaction force when the outer pad is pressed against the disk rotor by the outer piston. Thus, the inclination of the caliper and the outer piston with respect to the disk rotor can be effectively suppressed, and uneven wear of the outer pad in the rotor radial direction can be effectively suppressed.

According to the invention described in claim 2, the caliper has an opening for inserting the inner pad and the outer pad from the outer side in the rotor radial direction. Further, the reinforcing portion projects from the vehicle outer configuration wall surface of the opening toward the disk rotor at the center side in the rotor radial direction with respect to the outer pad inserted into the opening, and advances for the outer pad located on both sides of the rotor radially in the opening. The torque receiving portion and the reverse torque receiving portion are connected to each other.
Therefore, the reinforcement part has an easy structure that projects over the opening.

According to the invention described in claim 3, the reinforcing portion is formed separately from the caliper main body, and is configured to connect the forward torque receiving portion for the outer pad and the reverse torque receiving portion on the rotor center side with respect to the outer pad. It has become.
Therefore, the reinforcing portion can be selected from a material having high rigidity and can effectively reinforce the caliper 2.

According to the fourth aspect of the present invention, the caliper has an opening for inserting the inner pad and the outer pad from the outside in the rotor radial direction. The reinforcing portion is attached to the caliper main body and extends toward the disc rotor from the vehicle outer configuration wall surface of the opening at the center side in the rotor radial direction from the outer pad inserted into the opening, and on both sides of the opening in the rotor radial direction. The forward torque receiving portion and the reverse torque receiving portion for the outer pad that are located at the position are connected to each other.
Therefore, the reinforcement part has an easy structure that projects over the opening.

(Embodiment 1)
The first embodiment will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the disk brake 1 is a counter-type disk brake, and is disposed on the vehicle side with respect to the disk rotor R and disposed on the vehicle outer side with respect to the disk rotor R. And a caliper 2 straddling the disk rotor R in the rotor axial direction.

As shown in FIG. 1, the caliper 2 has a split configuration having an inner caliper 2c disposed on the vehicle side (inner side) and an outer caliper 2d disposed on the vehicle outer side (outer side).
The inner caliper 2c has a plurality (for example, a pair) of inner cylinder portions 2a into which a plurality (for example, a pair) of inner pistons 3 are inserted. The outer caliper 2d has a plurality (for example, a pair) of outer cylinder portions 2b in which a plurality (for example, a pair) of outer pistons 4 are inserted.

  The inner caliper 2c and the outer caliper 2d are connected by a plurality of bolts 2e as shown in FIG. Between the inner caliper 2c and the outer caliper 2d, a pair of bridge portions 2m, 2n straddling the disc rotor R in the rotor axial direction and an opening portion 2f opening between the bridge portions 2m, 2n are provided. An inner pad 5 and an outer pad 6 are inserted into the opening 2f from the outside in the rotor radial direction.

As shown in FIG. 4, the inner caliper 2c has a forward torque receiving portion 2k, a reverse torque receiving portion 21, and a pair of mounting portions 2g.
The forward torque receiving portion 2k extends from the bridge portion 2m toward the rotor radial center, and the reverse torque receiving portion 21 extends from the bridge portion 2n toward the rotor radial center. An inner pad 5 is inserted between the forward torque receiver 2k and the reverse torque receiver 2l. Therefore, the inner pad 5 can be restricted from moving in the rotor circumferential direction by the forward torque receiving portion 2k during forward braking, and can be restricted from moving in the rotor circumferential direction by the reverse torque receiving portion 21 during reverse braking.
An attachment portion 2g is provided at each tip of the forward torque receiving portion 2k and the reverse torque receiving portion 2l. The pair of attachment portions 2g are attached to the vehicle-side member 10 as shown in FIG.

As shown in FIG. 3, the outer caliper 2d has a forward torque receiving portion 2i and a reverse torque receiving portion 2j.
The forward torque receiving portion 2i extends from the bridge portion 2m toward the rotor radial center, and the reverse torque receiving portion 2j extends from the bridge portion 2n toward the rotor radial center. An outer pad 6 is inserted between the forward torque receiving portion 2i and the reverse torque receiving portion 2j. Therefore, the outer pad 6 can be restricted from moving in the rotor circumferential direction by the forward torque receiving portion 2i during forward braking, and can be restricted from moving in the rotor circumferential direction by the reverse torque receiving portion 2j during reverse braking.

The outer caliper 2d is integrally formed with a reinforcing portion 2h as shown in FIGS.
The reinforcing portion 2h protrudes toward the disc rotor R from the vehicle exterior side wall surface 2f1 of the opening 2f, as shown in FIGS. As shown in FIGS. 3 and 5, the reinforcing portion 2h extends linearly between the forward torque receiving portion 2i and the reverse torque receiving portion 2j located on both sides of the rotor 2 in the opening 2f, and connects them. ing. Accordingly, the reinforcing portion 2h reinforces the forward torque receiving portion 2i and the reverse torque receiving portion 2j by connecting them in the opening 2f region.

The inner pad 5 and the outer pad 6 have friction materials 5a and 6a that generate a frictional force with the disk rotor R, and back plates 5b and 6b that support the back surfaces of the friction materials 5a and 6a.
The inner pad 5 and the outer pad 6 are inserted from the outside in the rotor radial direction through the opening 2f as shown in FIGS. The inner pad 5 is disposed between the inner piston 3 and the disk rotor R, and the outer pad 6 is disposed between the outer piston 4 and the disk rotor R.
The inner pad 5 and the outer pad 6 are suspended and supported by the caliper 2 so as to be movable in the rotor axial direction by a pair of hanger pins 7.

Next, the states of the caliper 2 and the outer pad 6 during braking will be described.
The inner piston 5 presses the inner pad 5 against the disc rotor R, and the outer piston 4 presses the outer pad 6 against the disc rotor R. As a result, a braking force is generated. At that time, a reaction force of the pressing force of the inner pad 5 and the outer pad 6 by the inner piston 3 and the outer piston 4 is applied to the caliper 2. Therefore, the caliper 2 receives a force in the direction of swelling in the rotor axial direction.

  In the case of the conventional caliper 12, as shown in Figs. Therefore, the caliper 2 has a tendency that the center side in the rotor radial direction (lower side in FIG. 8) is larger in the rotor axial direction than the outer side in the rotor radial direction (upper side in FIG. 8). Further, since the caliper 12 has the mounting portion 12g on the inner side, the rigidity on the inner side is higher than the rigidity on the outer side, and the rotor radial center side portion on the outer side tends to swell the most in the rotor axial direction. It was in.

On the other hand, the caliper 2 of the present embodiment has a reinforcing portion 2h on the outer rotor side as shown in FIGS. For this reason, the caliper 2 has high rigidity at the rotor center side portion on the outer side by the reinforcing portion 2h, and is prevented from expanding in the rotor radial direction.
Therefore, the outer side of the caliper 2 is prevented from opening from the disc rotor R, and the outer piston 4 is prevented from being inclined with respect to the disc rotor R. As a result, uneven wear in the rotor radial direction of the outer pad 16 is suppressed.

The disc brake 1 is formed as described above.
That is, the caliper 2 has a reinforcing portion 2h that connects and reinforces the forward torque receiving portion 2i and the reverse torque receiving portion 2j closer to the rotor center than the outer pad 6 as shown in FIG.
Therefore, the caliper 2 is reinforced at the outer radial side central portion of the rotor side by the reinforcing portion 2h. Therefore, the reinforcing portion 2h can prevent the outer radial side center side portion of the caliper 2 from expanding in the rotor axial direction due to the reaction force when the outer pad 6 is pressed against the disk rotor R by the outer piston 4. Thus, the inclination of the caliper 2 and the outer piston 4 with respect to the disk rotor R can be effectively suppressed, and uneven wear of the outer pad 6 in the rotor radial direction can be effectively suppressed.
And the increase in the stroke amount of a brake pedal can be suppressed, a feeling improves, and the lifetime of the outer pad 6 also becomes long.

The caliper 2 has an opening 2f as shown in FIGS. The reinforcing portion 2h projects from the vehicle outer side wall surface 2f1 of the opening 2f toward the disc rotor R on the center side in the rotor radial direction with respect to the outer pad 6 inserted into the opening 2f, and on both sides of the rotor 2 of the opening 2f in the radial direction of the rotor. The forward torque receiving portion 2i and the reverse torque receiving portion 2j which are located at the position are connected to each other.
Therefore, the reinforcing portion 2h has an easy configuration that projects over the opening 2f.

(Embodiment 2)
A disc brake 1 according to Embodiment 2 will be described with reference to FIG.
The disc brake 1 according to the second embodiment is formed in the same manner as the opposed disc brake according to the first embodiment. However, the disc brake 1 according to the second embodiment is different from the first embodiment in that it has a reinforcing member 8 shown in FIG. 6 instead of the reinforcing portion 2h shown in FIGS. Hereinafter, the second embodiment will be described focusing on the differences.

The disc brake 1 according to Embodiment 2 has a reinforcing member 8 formed separately from the caliper body as shown in FIG.
The reinforcing member 8 is made of a highly rigid metal or the like and is attached to the surface of the outer caliper 2d on the center side in the rotor radial direction.
The reinforcing portion 8a, which is a part of the reinforcing member 8, protrudes from the vehicle outer side wall surface 2f1 of the opening 2f toward the disc rotor R on the rotor center side (the front side in FIG. 6) of the outer pad 6. The reinforcing member 8 connects and reinforces the forward torque receiving portion 2i and the reverse torque receiving portion 2j for the outer pad 6 via the reinforcing portion 8a.

As described above, the disc brake 1 according to Embodiment 2 is formed.
That is, the reinforcing portion 8a is formed separately from the caliper main body, and is configured to connect the forward torque receiving portion 2i and the reverse torque receiving portion 2j closer to the rotor center than the outer pad 6.
Therefore, the reinforcement part 8a can select a material with high rigidity etc., and has the structure which can reinforce the caliper 2 effectively.
Further, the reinforcing portion 8a is attached to the caliper main body, and protrudes from the opening 2f to connect the forward torque receiving portion 2i and the reverse torque receiving portion 2j.
Therefore, the reinforcing portion 8a has an easy configuration to project over the opening 2f.

(Other embodiments)
The present invention is not limited to the first and second embodiments, and may be the following modes.
(1) That is, the reinforcing portions 2h and 8a according to the first and second embodiments protrude toward the disc rotor R from the vehicle outer side wall surface 2f1 of the opening 2f as shown in FIGS. However, the reinforcing portion is rod-shaped (for example, a bolt or the like) and is connected to the forward torque receiving portion 2j and the reverse torque receiving portion 2j at a position away from the vehicle outer configuration wall surface 2f1 and at a position closer to the disc rotor than the vehicle outer configuration wall surface 2f1. The form to do may be sufficient.
(2) The caliper according to the first and second embodiments has a reinforcing portion that connects and reinforces the forward torque receiving portion and the reverse torque receiving portion for the outer pad. That is, the caliper has a reinforcing portion only on the outer side. However, the caliper may have an inner side reinforcing portion in addition to the outer side reinforcing portion. That is, the caliper may have a reinforcing portion that connects and reinforces the forward torque receiving portion and the reverse torque receiving portion for the inner pad.

1 is a top view of a disc brake according to Embodiment 1. FIG. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1. 3 is a top view of the caliper according to Embodiment 1. FIG. 6 is a bottom view of a disc brake according to Embodiment 2. FIG. It is a cross-sectional schematic diagram from above of a conventional disc brake. FIG. 8 is a schematic cross-sectional view taken along line VIII-VIII in FIG. 7.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 ... Disc brake 2, 12 ... Caliper 2a ... Inner cylinder part 2b ... Outer cylinder part 2i, 2k ... Forward torque receiving part 2j, 2l ... Reverse torque receiving part 2m, 2n, 12m, 12n ... Bridge part 2g, 12g ... Mounting parts 2h, 8a ... Reinforcing part 2f ... Opening part 2f1 ... Vehicle outer configuration wall surface 3,13 ... Inner piston 4,14 ... Outer piston 5,15 ... Inner pad 6,16 ... Outer pad 8 ... Reinforcing member 10 ... Vehicle side Member R ... Disc rotor

Claims (4)

An inner pad (5) disposed on the vehicle side from the disk rotor (R), an outer pad (6) disposed on the vehicle outer side from the disk rotor (R), and a member from the vehicle side (10) to the disk The caliper (2) straddling the rotor (R) in the rotor axial direction, and the inner pad (5) is pressed against the disc rotor (R) by an inner piston (3) provided in the caliper (2). A counter-type disc brake (1) for pressing the outer pad (6) against the disc rotor (R) by an outer piston (4) provided in the caliper (2);
The caliper (2) includes a forward torque receiving portion (2i) that restricts movement of the outer pad (6) in the rotor circumferential direction during forward braking, and a rotor circumferential direction of the outer pad (6) during reverse braking. A reverse torque receiving portion (2j) that restricts movement, and a reinforcing portion that connects and reinforces the forward torque receiving portion (2i) and the reverse torque receiving portion (2j) closer to the rotor center side than the outer pad (6). (2h) The opposing type disc brake (1) characterized by having. A counter-type disc brake (1) according to claim 1,
The caliper (2) has an opening (2f) for inserting the inner pad (5) and the outer pad (6) from outside in the rotor radial direction,
The reinforcing portion (2h) extends from the vehicle outer configuration wall surface (2f1) of the opening (2f) to the disc rotor (R) on the center side in the rotor radial direction from the outer pad (6) inserted into the opening (2f). The forward torque receiving portion (2i) and the reverse torque receiving portion (2j) for the outer pad located on both sides of the rotor (2f) in the radial direction of the opening (2f) are connected to each other. The opposed disc brake (1). A counter-type disc brake (1) according to claim 1,
The reinforcing portion (8a) is formed separately from the caliper body, and connects the forward torque receiving portion (2i) and the reverse torque receiving portion (2j) for the outer pad closer to the rotor center side than the outer pad (6). An opposed type disc brake (1) characterized in that it is configured. A counter-type disc brake (1) according to claim 3,
The caliper (2) has an opening (2f) into which the inner pad (5) and the outer pad (6) are inserted from the outer side in the rotor radial direction,
The reinforcing portion (8a) is attached to the caliper main body, and the vehicle exterior side wall surface (2f1) of the opening (2f) is closer to the rotor radial center than the outer pad (6) inserted into the opening (2f). ) Extending toward the disc rotor (R) and connecting the forward torque receiving portion (2i) and the reverse torque receiving portion (2j) for the outer pad located on both sides of the rotor (R) in the radial direction of the opening (2f) An opposed type disc brake (1) characterized in that

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