JP2010236655A - Mechanical disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mechanical disc brake capable of surely preventing drag of friction pads on the operation part and reaction part sides by allowing respective friction pads on the operation part and reaction part sides to be actively spaced from a disc rotor when releasing breaking. <P>SOLUTION: The mechanical disc brake consists of pressing members 4, 5 which press a pair of friction pads 2, 3, of an advancing retracting mechanism 7 which produces pressing force in the pressing members 4, 5 and a driving part 8 which drives the advancing retracting mechanism 7, and a supporting part 11 which supports a caliper body 1. The pressing member 4 on an operation part 12 side is formed so as to be movable integrally with the advancing retracting mechanism 7. The pressing member 5 on a reaction part 14 side is formed so as to be movable in an axial direction of a disc rotor 10 through the medium of a slide pin 34. The slide pin 34 contains an elastic member 33, compresses and deforms the elastic member 33 at braking, and allows a caliper body 1 to be restored to an initial position by restoring force of the elastic member 33 at release of braking. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a mechanical disc brake used for a parking brake, for example.

  Conventionally, as a mechanical disk brake for parking a vehicle, for example, as described in Patent Documents 1 and 2, a brake pedal and a brake lever are operated to generate thrust in the axial direction of the disk rotor on a pressing member. Therefore, a mechanical disc brake that brakes a vehicle is known.

  That is, in the inventions described in Patent Documents 1 and 2, when the operator operates the brake pedal or the brake lever, the piston assembled to the caliper body moves to the disk rotor side, thereby causing the action portion side and the reaction portion side. Among the pressing members respectively provided in the above, the pressing member on the action part side moves to the disk rotor side together with the piston. As a result, the friction pad fixed to the pressing member on the action portion side moves to the disk rotor side together with the pressing member, and presses against one side surface of the disk rotor. Then, due to the reaction force accompanying the movement of the pressing member on the action part side, the pressing member on the reaction part side moves to the disk rotor side, and the friction pad fixed to the pressing member on the reaction part side moves together with the pressing member. It is in pressure contact with the other side of the disk rotor. As a result, the friction pads on the action part side and the reaction part side come into pressure contact with both side surfaces of the disk rotor, so that the vehicle is braked.

  However, the conventional mechanical disc brakes as shown in Patent Document 1 and Patent Document 2 are different from the hydraulic disc brakes in which the piston can be actively separated from the disc rotor by the roll back action by the piston seal, and the piston is arranged in the disc. It does not have a configuration that is positively separated from the rotor. In particular, in the pressing member on the reaction portion side, the separation from the disk rotor has conventionally been dependent only on the reaction force on the action portion side. However, it is difficult to sufficiently separate the pressing member on the reaction part side from the disk rotor only by the reaction force on the action part side. For this reason, it is difficult to sufficiently separate the friction pads on the action part side and the reaction part side from the disk rotor when braking is released, and a drag problem is likely to occur.

JP 2002-206576 A JP-A-5-196068

  Accordingly, the present invention is intended to solve the above-described problems. In a mechanical disc brake, when the brake is released, the friction pads on the action portion side and the reaction portion side can be actively separated from the disc rotor. By doing so, it is intended to reliably prevent dragging of the friction pad on the action part and reaction part side.

  In order to solve the above-described problems, the present invention is provided with a pair of pressing members for pressing the friction pads respectively disposed on the action part and the reaction part of the caliper body, and a cylinder hole on the action part side so as to press the pressing member. An advancing / retreating mechanism that generates pressure, a drive unit that drives the advancing / retreating mechanism in response to an operation from an operator, and a support that supports the caliper body so as to be movable in the axial direction of the disk rotor via a slide pin. And a mechanical disc brake that does not use hydraulic pressure.

  The pressing member on the action part side is formed integrally with the advance / retreat mechanism via a fixing member and is movable in the axial direction of the disc rotor with respect to the caliper body, and the pressing member on the reaction part side is The caliper body is fixedly arranged so as to be movable in the axial direction of the disk rotor via the slide pin together with the caliper body.

  As described above, in the present invention, the pressing member on the action portion side can be moved integrally with the advance / retreat mechanism via the fixed member. Therefore, the press member that moves in the direction of the disk rotor during braking moves forward / backward when the brake is released. It moves in the separation direction of the disk rotor together with the mechanism. By the movement of the pressing member on the action side, the friction pad is pressed and moved by the pressing member, and can be restored to the initial position before the start of braking. Therefore, during braking, the pressing member moves to the disc rotor side together with the advance / retreat mechanism, while only the advance / retreat mechanism returns to the initial position when braking is released, and it becomes difficult to restore the pressing member on the action portion to the initial position. It can be avoided. Therefore, it is possible to reliably prevent dragging of the friction pad on the action part side.

  Further, according to the present invention, an elastic member is provided on the outer periphery of the slide pin coaxially with the slide pin, so that at the time of braking, the caliper body moves toward the disk rotor, so that the elastic member is compressed and deformed, and the brake is released. In some cases, the caliper body can be restored to the initial position by the restoring force of the elastic member. Therefore, along with the restoration of the caliper body to the initial position, the pressing member on the reaction portion side fixed to the caliper body is also positively restored to the initial position before the start of braking.

  Therefore, the friction pad on the reaction part side positively moves away from the disk rotor by the restoration of the pressing member on the reaction part side to the initial position. By such a positive separation of the pressing member on the reaction part side, a sufficient space can be provided between the friction pad on the reaction part side and the disk rotor at the time of releasing the brake. It becomes possible to reliably prevent the dragging problem.

  The slide pin comprises a bolt formed by a shaft portion and a head formed at one end of the shaft portion, and a sleeve through which the bolt is inserted, and the tip end side of the bolt shaft portion is assembled to the vehicle body. A support portion is formed by fixing the position of the slide pin to the bracket, and in this support portion, the arm portion of the caliper body is slidably supported with respect to the slide pin, and the arm portion The elastic member may be disposed between the end opposite to the disk rotor and the head of the bolt. As described above, by fixing the position of the slide pin and disposing the elastic member between the arm portion of the caliper body and the head portion of the bolt, the restoring force of the elastic member is directly transmitted to the arm portion. The restoring force can ensure the movement of the caliper body to the initial position via the arm portion. Accordingly, the movement of the caliper body to the initial position positively moves the reaction portion side of the caliper body in the disc rotor separation direction and restores the initial position, thereby reliably dragging the friction pad on the reaction portion side. Can be prevented.

  The elastic member may be a cylindrical rubber material. Since the elastic member is formed of a cylindrical rubber material in this way, the elastic member can be easily assembled to the arm portion of the caliper body. Therefore, the pressing member on the reaction portion side can be easily formed with a simple structure. Can be positively moved in the disc rotor separation direction.

  Further, an abutting member that can come into contact with an abutting portion fixed to the vehicle body at the time of releasing the brake may be arranged at the end of the arm portion on the disc rotor side so as to protrude in the axial direction of the disc rotor. . By providing the abutting member on the arm portion in this manner, the caliper body can be reliably moved to the position where the abutting member abuts against the abutting portion by the restoring force of the elastic member when braking is released. Therefore, it is possible to reliably move the reaction-side friction pad fixedly arranged on the caliper body to a predetermined position.

  Further, the abutting member may be capable of adjusting a protruding length of the disk rotor in the axial direction. By making the abutting member adjustable in this way, it is possible to set a desired distance between the disc rotor and the friction pad when the brake is not braked. Therefore, it becomes easy to appropriately change the operating conditions of the brake at the time of braking, such as the timing to start braking and the time to complete braking.

  The mechanical disc brake of the present invention may be an electric disc brake in which the pressing member is electrically driven. In other words, the electric disc brake is conventionally driven electrically by the pressing member. For example, since the entire caliper body is heavy because an electric motor or the like is assembled, the caliper body is completely returned to the initial position when the brake is released. It was difficult to move. Therefore, it is difficult to sufficiently separate the friction pad from the disk rotor, and the problem of dragging of the friction pad on the reaction portion side is likely to occur. Therefore, by using the present invention for an electric disc brake, the friction pads on the working portion side and the reaction portion side can be positively separated from the disc rotor as described above, and thus drag is reliably prevented. It becomes possible. Therefore, the performance can be further improved as compared with the conventional electric disc brake for parking.

  Since the present invention is configured as described above, the pressing member moved to the disk rotor side during braking can be achieved by allowing the pressing member on the action portion side to move integrally with the advance / retreat mechanism via the fixing member. When the brake is released, the member can be moved together with the advance / retreat mechanism in the disc rotor separation direction so that the member can be reliably restored to the initial position before the start of braking. Accordingly, during braking, the pressing member moves to the disk rotor side together with the advance / retreat mechanism, while only the advance / retreat mechanism returns to the initial position when braking is released, and only the pressing member remains at the position on the disk rotor side during braking. Can be avoided. Therefore, the friction pad on the action part side can be separated from the disk rotor and reliably returned to the initial position, and dragging of the friction pad on the action part side can be reliably prevented.

  Further, by providing an elastic member on the outer periphery of the slide pin, when the brake is released, the reaction part side of the caliper body can be restored to the initial position by the restoring force of the elastic member. Therefore, by restoring the caliper body to the initial position on the reaction part side, the pressing member on the reaction part side is positively restored to the initial position. Therefore, by restoring the pressing member on the reaction portion side, the friction pad on the reaction portion side also moves in the direction away from the disk rotor together with the pressing member on the reaction portion side, and is restored to the initial position before the brake is released. As a result, it is possible to ensure a sufficient distance between the friction pad on the reaction part side and the disk rotor at the time of braking release, and it is possible to reliably prevent the problem of friction pad dragging on the reaction part side. Become.

  As described above, the mechanical disc brake of the present invention can positively separate the friction pad from the disc rotor at the time of releasing the brake in both the action portion and the reaction portion. Therefore, both the action portion side and the reaction portion side are provided. It is possible to reliably prevent the friction pad from being dragged.

The side view of the caliper body at the time of non-braking which shows Example 1 of the present invention. Sectional drawing of FIG. FIG. 3 is a partial enlarged cross-sectional view illustrating a support portion during non-braking in the first embodiment. FIG. 3 is a side view of the caliper body during braking in the first embodiment. FIG. 3 is a cross-sectional view of the caliper body during braking in the first embodiment. FIG. 3 is a partial enlarged cross-sectional view showing a support portion during braking in the first embodiment. FIG. 9 is a partial plan view showing the inside of a caliper body during non-braking in the second embodiment. The caliper body bottom view at the time of the non-braking in Example 2. FIG. FIG. 9 is a partial enlarged cross-sectional view illustrating a support portion during non-braking in the third embodiment.

  A first embodiment of the present invention will be described with reference to FIGS. 1 to 6. (1) is a caliper body, and this first embodiment is a pair of friction pads (2) (3) provided on the caliper body (1). A pressing member (4) (5) that presses and a cylinder hole (6) of the caliper body (1), and an advancing / retracting mechanism (7) for generating a pressing force on the pressing member (4) (5); A drive unit (8) for driving the advance / retreat mechanism (7) according to an operation from an operator, and the caliper body (1) in the axial direction of the disk rotor (10) via a slide pin (34). An electric disc brake for parking provided with a support portion (11) that is movably supported.

  The first embodiment will be described in more detail. As shown in FIG. 1, a drive motor (13) is connected as a drive section (8) of the present invention to the working section (12) side of the caliper body (1). Thus, the pressing members (4) and (5) can be electrically driven, and a reaction force claw (15) is formed on the reaction portion (14) side opposite to the action portion (12). Then, a cylinder hole (6) is formed in the caliper body (1) as shown in FIG. 2, and a screw shaft (as an advance / retreat mechanism (7) of the present invention is formed in the cylinder hole (6). A screw mechanism (18) comprising 16) and a nut (17) is housed.

  And the base end part (20) of the screw shaft (16) of this screw mechanism (18) is connected to the drive motor (13) of the said drive part (8) via the gear (21). Further, on the outer periphery of the nut (17), a pressing member (4) on the side of the action portion (12) formed in a cylindrical shape is fixedly arranged via a fixing member (23), thereby being integrated with the nut (17). To be movable.

  In this way, the pressing member (4) on the action part (12) side can be moved integrally with the nut (17), so that the pressing member on the action part (12) side moved to the disk rotor (10) side during braking. (4) moves in the separating direction of the disk rotor (10) together with the nut (17) when the brake is released. Accordingly, since the pressing member (4) on the action portion (12) side can be reliably restored to the initial position before the start of braking, only the advance / retreat mechanism (7) returns to the initial position when the brake is released, It is possible to prevent the member (4) from staying at the position on the disk rotor (10) side during braking and causing dragging.

  The pressing member (4) on the side of the action part (12) is provided with a pressing wall (24) parallel to the disk rotor (10) on the disk rotor (10) side, and a nut (17) inside. Storage is arranged. Further, a cylindrical piston boot (25) in which a plurality of collars are formed is provided between the outer periphery of the pressing wall (24) of the pressing member (4) and the inner periphery of the cylinder hole (6). Yes. By providing the piston boot (25) in this way, the inside of the cylinder hole (6) can be blocked from the outside air, so that dust and rainwater from the outside of the cylinder hole (6) can be removed from the inside of the cylinder hole (6). It is possible to prevent the situation of intrusion. Therefore, the components in the cylinder hole (6) can be held in a good state.

  Further, by forming the outer periphery of the pressing member (4) to a size corresponding to the inner periphery of the cylinder hole (6), the pressing member (4) slides along the inner peripheral shape of the cylinder hole (6). It is assembled to be free. In addition, as shown in FIG. 2, the friction pad (2) is fixedly disposed on the disk rotor (10) side of the pressing wall (24) provided on the pressing member (4) on the action portion (12) side, and the reaction portion. The friction pad (3) is also fixedly arranged on the inner surface of the reaction force claw (15) which is the pressing member (5) on the (14) side so as to face the friction pad (2) on the action part (12) side. Yes.

  The friction pads (2) and (3) on the action part (12) side and the reaction part (14) side are detachably fixedly arranged on the pressing wall (24) and the reaction force claw (15), respectively. That is, the pressing wall (24) and the reaction force claw (15) are each provided with a fitting recess (not shown) on the wall surface on the disk rotor (10) side which is the mounting surface of the friction pads (2) and (3). At the same time, each friction pad (2) (3) is formed with a fitting protrusion (not shown) that can be fitted into the fitting recess at a position corresponding to the fitting recess. Then, the friction pads (2) and (3) are fixedly arranged in a removable state on the pressing wall (24) and the reaction force claw (15) by fitting the fitting protrusion and the fitting recess. . Therefore, when replacing the friction pads (2) and (3), the friction pads (2) and (3) are appropriately removed from the pressing wall (24) or the reaction force claw (15) as required by the user, or the pressing wall. It becomes easy to attach to (24) or the reaction force claw (15).

  A pair of arm portions (28) and (30) are integrally formed on both sides of the caliper body (1) on the action portion (12) side. Each of the arms (28) and (30) is formed with a through hole (31) in the axial direction of the arms (28) and (30) as shown in FIG. The sleeve (32) constituting the slide pin (34) described below is inserted and arranged with both ends protruding from the through hole (31). The sleeve (32) has an outer diameter of the arm (28) (30) so that the arm (28) (30) can slide along the slide pin (34) as described below. It has a smaller diameter than the inner diameter of the through hole (31).

  Further, in the sleeve (32) inserted through the through holes (31) of the arms (28) and (30) as described above, as shown in FIG. 3, the protruding portion (39) protruding to the opposite side to the bracket (41). An elastic member (33) formed of a cylindrical rubber material is inserted and arranged on the outer periphery. Then, as shown in FIG. 3, a bolt (27) is inserted into the sleeve (32) in which the arms (28), (30) of the caliper body (1) and the elastic member (33) are arranged as described above. Yes. The bolt (27) includes a shaft portion (35) and a head portion (36) formed at one end of the shaft portion (35). (47) is formed. The bolt (27) and the sleeve (32) formed as described above constitute the slide pin (34) of this embodiment.

  The inner surface of the head (36) of the bolt (27) is disposed so as to abut against the end surface (38) of the elastic member (33) via a washer (37). As a result, the elastic member (33) is positioned between the end surfaces of the arms (28) and (30) and the inner surface of the head (36) of the bolt (27). As described above, the cylindrical elastic member (33) is disposed on the outer periphery of the sleeve (32), and the bolt (27) is inserted and disposed inside the sleeve (32). It is arranged on the outer periphery of the slide pin (34) composed of the bolt (27) and the sleeve (32) and coaxially with the slide pin (34).

  Then, by inserting the bolt (27) into the sleeve (32) as described above, the distal end side of the shaft (35) of the bolt (27) protrudes outward from the sleeve (32) as shown in FIG. It will be a thing. Then, the protrusion (46) of the bolt (27) is inserted into the fixing hole (42) of the bracket (41) fixed to the vehicle body, and the inner peripheral screw groove formed on the inner periphery of the fixing hole (42). An outer peripheral thread groove (47) of the protrusion (46) is screwed and fixed to (not shown). Thus, the bolt (27) is fixed to the bracket (41). Therefore, the arms (28) and (30) move along the bolts (27) fixed in position as described above, and therefore the arms (28) and (30) are moved along the slide pins (34). It becomes slidable. The bracket (41) and the slide pin (34) constitute the support portion (11) of the present invention.

  By configuring the support portion (11) as described above, the caliper body (1) is supported while being movable with respect to the bracket (41) of the vehicle body. ) Is movable along the slide pin (34) in the axial direction of the disk rotor (10).

  As shown in FIGS. 1 and 3, a cylindrical pin boot (43) in which a plurality of collars are formed annularly is disposed between the arm portions (28), (30) and the bracket (41). . That is, as shown in FIG. 3, one end edge of the pin boot (43) is connected and fixed to the inner peripheral end portion on the bracket (41) side of the arm portions (28) and (30), and the other end edge is connected to the sleeve (32). It is connected and fixed to the outer peripheral end of the bracket (41) side. By disposing the pin boot (43) as described above, it is possible to prevent dust and the like from the outside from adhering to the outer periphery of the sleeve (32), and therefore the arm portion (28) along the sleeve (32). (30) can be slid smoothly.

  Further, in FIG. 3, an abutting member (44) formed in a short shaft shape is provided on the bracket (41) on the inner side in the radial direction of the disk rotor (10) of the arms (28) and (30) of the caliper body (1). It protrudes to the side. And the contact part (45) which can contact | abut the front-end | tip of an abutting member (44) is formed in the bracket (41) in the position facing the said abutting member (44). During non-braking, the abutting member (44) is always kept in contact with the contact portion (45) by the restoring force of the elastic member (33).

  Further, this abutting member (44) is provided with a screw groove on its outer periphery, so that its protruding length can be adjusted in the axial direction of the disk rotor (10). Therefore, the distance between the disk rotor (10) and the friction pads (2) (3) can be further narrowed by adjusting the protruding length of the abutting member (44) to make it longer, and the abutting By further shortening the protruding length of the member (44), the distance between the disc rotor (10) and the friction pads (2) and (3) can be further increased. Therefore, by making the projecting length of the abutting member (44) adjustable in this way, the distance between the disc rotor (10) and the friction pads (2) (3) during non-braking is set to a desired distance in advance. Since it can be set, it becomes easy to appropriately adjust the operating conditions of the brake at the time of braking, such as the timing for starting braking and the time for completing braking. In this embodiment, as described above, the protruding length of the abutting member (44) can be adjusted. However, in other different embodiments, the abutting member (44) cannot be adjusted and the arm portion (28) ( It is also possible to fix to 30).

  In the configuration as described above, the operation of the brake will be described below. First, as shown in FIGS. 1 and 2, when the brake is not operated, a predetermined value is previously set between the pair of friction pads (2) (3) fixed to the pressing members (4) (5) and the disc rotor (10). The interval is provided. Further, as shown in FIG. 3, when the brake is not operated, the abutting member (44) provided on the arms (28) and (30) is positioned in contact with the contact portion (45) of the bracket (41). ing.

  In such a state, the drive motor (13) is operated by the operator's operation to rotate the drive shaft (not shown) in one direction, so that the drive force of the drive motor (13) is changed to the gear (21). To the screw shaft (16). Then, the screw shaft (16) on the acting portion (12) side rotates in one direction by the transmission of this driving force, so that the nut (17) moves to the disk rotor (10) side by the rotation of the screw shaft (16). To be.

  As the nut (17) moves to the disk rotor (10) side, the pressing member (4) on the action portion (12) side fixed integrally with the nut (17) is moved to the disk rotor (10) side. Moving. As a result, the friction pad (2) fixedly disposed on the pressing member (4) is pressed toward the disk rotor (10) and is pressed against the side surface of the disk rotor (10) on the working portion (12) side. .

  As for the operation on the reaction portion (14) side, first, the arms (28) and (30) of the caliper body (1) are caused by the reaction force accompanying the movement of the pressing member (4) on the action portion (12) side. By sliding along the slide pin (34), the caliper body (1) moves in the direction opposite to the moving direction of the nut (17).

  And by this movement of the caliper body (1), the pressing member (5) on the reaction portion (14) side constituted by the reaction force claw (15) of the caliper body (1) moves to the disk rotor (10) side. Therefore, the friction pad (3) fixedly arranged on the pressing member (5) on the reaction part (14) side moves to the disk rotor (10) side, and the side surface on the reaction part (14) side of the disk rotor (10). It will be pressed against. From the above, as shown in FIGS. 4 and 5, the pair of friction pads (2) and (3) respectively provided on the action part (12) side and the reaction part (14) side are pressed against both surfaces of the disk rotor (10). The vehicle is braked.

  Here, due to the reaction force on the side of the action portion (12) as described above, the arms (28) and (30) of the caliper body (1) are moved in the direction of movement of the nut (17) as shown by the arrows in FIG. Is slid along the slide pin (34) toward the elastic member (33) which is the opposite direction. At this time, since the bolt (27) of the slide pin (34) is fixedly disposed on the bracket (41) of the vehicle body independently of the caliper body (1) as described above, the arms (28) (30) Is slid toward the elastic member (33), whereby the elastic member (33) is pressed toward the head (36) of the bolt (27) in a fixed state. Thereby, the elastic member (33) is compressed and deformed between the arm portions (28) and (30) and the head portion (36) of the bolt (27).

  As shown in FIGS. 4 and 6, the arms (28) and (30) of the caliper body (1) slide in the direction of the elastic member (33) along the slide pin (34) as described above. The abutting member (44) assembled to the arm portions (28) and (30) is separated from the abutting portion (45) of the bracket (41) and abuts against the abutting member (44) until the braking is released. The separation from the part (45) is maintained. As described above, the abutting member (44) and the contact portion (45) are separated from each other during braking. However, when the braking is released, the arms (28) and (30) are elastically moved as described later. Since the member (33) is pressed toward the bracket (41) by the restoring force, the abutting member (44) comes into contact with the contact portion (45) as shown in FIG.

  Next, the release of braking will be described. First, the screw motor (13) is operated by an operator's operation to rotate the drive shaft in the direction opposite to the rotation direction at the time of braking. 16) rotates through the gear (21) in the direction opposite to that during braking. As a result, the nut (17) assembled to the screw shaft (16) moves away from the disk rotor (10). Accordingly, the pressing member (4) fixed integrally with the nut (17) and the friction pad (2) on the action portion (12) side move together with the nut (17) in the direction away from the disk rotor (10).

  At this time, the pressing member (4) on the action portion (12) side is formed so as to be movable integrally with the nut (17) via the fixing member (23) as described above. For this reason, when the brake is released, the nut (17) moves in the direction away from the disk rotor (10), so that the pressing member (4) on the action portion (12) side together with the nut (17) serves as the disk rotor (10). ) Side moves in the separating direction. Accordingly, when the brake is released, the pressing member (4) on the action part (12) side can be surely moved in the separating direction of the disk rotor (10), so that the friction on the action part (12) side is obtained. It is possible to reliably prevent the pad (2) from being dragged.

  Further, the caliper body (1) moves in the direction opposite to the moving direction of the nut (17) by the reaction force on the action part (12) side. Therefore, by the movement of the caliper body (1), the reaction force claw (15), which is the pressing member (5) on the reaction portion (14) side, moves away from the disk rotor (10).

  However, it is difficult to sufficiently move the pressing member (5) on the reaction part (14) side to the initial position in the separation direction of the disk rotor (10) only by the reaction force on the action part (12) side. is there. Therefore, conventionally, when the brake is released, the friction pad (3) on the reaction portion (14) side remains on the disk rotor (10) side without being restored to the initial position, and a drag problem is likely to occur. Therefore, in the present embodiment, as described above, by disposing the elastic member (33) between the arms (28) (30) of the caliper body (1) and the head (36) of the bolt (27), The friction pad (3) on the reaction portion (14) side can be positively moved in the separating direction of the disk rotor (10).

  That is, during braking, the elastic member (33) is compressed and deformed between the arms (28), (30) of the caliper body (1) and the head (36) of the bolt (27) as described above. However, when the brake is released, the arms (28), (30) of the caliper body (1) are also moved by the movement of the caliper body (1) by the reaction force of the action portion (12). Along the bracket (41), which is in the opposite direction to that during braking. Then, the movement of the arms (28), (30) toward the bracket (41) causes the arms (28), (30) to move the bolt (27) of the elastic member (33) toward the head (36). Since the pressure is released, the elastic member (33) that has been compressed and deformed between the arms (28), (30) and the head (36) during braking is restored by its own restoring force. It will be a thing.

  And the said arm part (28) (30) will be pressed by the elastic member (33) to the bracket (41) side by the restoring force of this elastic member (33). Accordingly, as shown in FIG. 3, the arms (28) and (30) are moved along the slide pin (34) until the tip of the abutting member (44) comes into contact with the contact portion (45) of the bracket (41). Slide toward the bracket (41).

  The caliper body (1) as a whole moves in the direction opposite to the direction of movement of the nut (17) by sliding the arms (28) (30) toward the bracket (41) by the restoring force of the elastic member (33). Will be actively moving to. Accordingly, the pressing member (5) on the reaction portion (14) side constituted by the reaction force claw (15) of the caliper body (1) is positively moved in the separating direction of the disc rotor (10) together with the friction pad (3). It will move. Therefore, a sufficient space is ensured between the friction pad (3) on the reaction portion (14) side and the disk rotor (10). Therefore, it is possible to reliably prevent dragging of the friction pad (3) on the reaction portion (14) side.

  As described above, by making the pressing member (4) and the nut (17) on the action part (12) side move integrally with the fixing member (23) on the action part (12) side, On the (14) side, an elastic member (33) is provided between the arm (28) (30) and the head (36) of the bolt (27) fixed to the bracket (41), so that the brake is released. The pressing members (4) and (5) on both the action part (12) side and the reaction part (14) side can be positively moved in the separating direction of the disk rotor (10). Accordingly, as shown in FIGS. 1 and 2, it is possible to provide a sufficient distance between the friction pads (2) and (3) of the action portion (12) and the reaction portion (14) and the disk rotor (10). It is possible to reliably prevent dragging of the friction pads (2) and (3) on both the part (12) side and the reaction part (14) side.

  Further, in the first embodiment, as described above, the pressing members (4) and (5) on the action portion (12) side and the reaction portion (14) side are provided on the disk by providing the fixing member (23) and the elastic member (33). The rotor (10) can be actively moved in the direction of separation, and the friction pads (2) and (3) on the action part (12) side and the reaction part (14) side can be reliably prevented from being dragged. In the second embodiment, it is possible to further enhance the drag prevention effect of the friction pads (2) and (3) by assembling the coupling spring (48) and the V spring (50) to the electric disc brake of the first embodiment. Yes.

  The second embodiment will be described below. As shown in FIGS. 7 and 8, an engaging protrusion (51) is provided on the outer surface of the friction pad (3) on the reaction portion (14) side so as to protrude outward. A connecting spring (48) formed by a leaf spring is engaged with the engaging protrusion (51). The connecting spring (48) has a central portion protruding into a U-shape with a flat portion (52) formed at the tip, and a pair of curved springs are bent in opposite directions to the central portion. The curved portions (53) and (54) are formed.

  7 and 8, the flat portion (52) of the coupling spring (48) is brought into contact with the friction pad (3) on the reaction portion (14) side. While engaging with the engaging protrusion (51), both ends via the pair of curved portions (53) and (54) are respectively attached to the reaction force claws (15) located on both sides of the engaging protrusion (51). Abutment is arranged.

  By disposing the connecting spring (48) as described above, the engaging protrusion (51) of the friction pad (3) is attached to the reaction force claw (15) side by the flat portion (52) of the connecting spring (48). Therefore, the friction pad (3) on the reaction portion (14) side is always urged to the reaction force claw (15) side. Accordingly, the friction pad (3) on the reaction part (14) side, which is detachably fixed to the pressing member (5) on the reaction part (14) side as in the first embodiment, is applied to the biasing force of the connection spring (48). Thus, it can be firmly fixed to the pressing member (5) on the reaction part (14) side. Therefore, when the brake is released, the friction pad (3) on the reaction portion (14) side can be reliably moved together with the pressing member (5) on the reaction portion (14) side in the separating direction of the disc rotor (10). .

  Further, as shown in FIG. 7, the friction pads (2) and (3) on the action part (12) side and the reaction part (14) side are connected by a pair of V springs (50), respectively. The V spring (50) is formed by bending a spring wire into a V-shape, and one end (55) of the V spring (50) is connected to the friction pad (2) on the action portion (12) side. And the other end (57) through the bent portion (56) across the disk rotor (10) is engaged with the outer periphery of the friction pad (3) on the reaction portion (14) side. Yes.

  Thereby, the friction pads (2) and (3) on the action part (12) side and the reaction part (14) side are urged in the separating direction by the urging force of the V spring (50). Therefore, the friction pads (2) and (3) on the action part (12) side and the reaction part (14) side are always urged in the separating direction of the disk rotor (10) by the urging force of the V spring (50). Is possible. Therefore, the drag preventing effect of the friction pads (2) and (3) when releasing the brake can be further enhanced.

  As described above, the pressing member (5) on the reaction part (14) side and the friction pad (3) can be firmly fixed by the connecting spring (48), and the action part (12) side by the V spring (50). Since the friction pads (2) and (3) on the reaction portion (14) side can be urged in the direction away from the disk rotor (10), the connecting spring (48) and the V spring (50) are used as main screws. By using it for the mechanical disc brake of the invention, it becomes possible to more effectively suppress dragging of the friction pads (2) and (3). In this embodiment, both the connecting spring (48) and the V spring (50) are used. However, in another different embodiment, only one of the connecting spring (48) and the V spring (50) is used. Can be used, and in this case, the drag preventing effect at the time of releasing the brake can be enhanced.

  In the first and second embodiments, as shown in FIG. 3, the abutting member (44) is provided below the arms (28) and (30) of the caliper body (1). ) Can be brought into contact with the abutting portion (45) provided on the bracket (41), but in this third embodiment, as shown in FIG. The mechanical disc brake of the present invention is formed without providing the abutting member (44) and the abutting portion (45) as shown in FIG. The third embodiment will be described below. In the third embodiment, as in the first and second embodiments, the elastic member (33) that has been compressed and deformed by the pressing of the arms (28) and (30) during braking is as follows. When the brake is released, the arm (28) (30) is pressed against the bracket (41) by its own restoring force, whereby the friction pad (3) on the reaction part (14) side is separated from the disk rotor (10). Move positively in the direction.

  Here, in the first and second embodiments, the arms (28), (30) slide along the slide pin (34) until they abut against the abutting portion (45) of the abutting member (44). However, since the abutting member (44) is not provided in the third embodiment, the sliding of the arm portions (28) (30) is stopped when the elastic member (33) is completely restored, and the caliper is thereby removed. The movement of the friction pad (3) on the reaction part (14) side in the body (1) is stopped.

  Also in this case, the friction pad (3) on the reaction part (14) side positively separates the disc rotor (10) together with the pressing member (5) on the reaction part (14) side by the restoring force of the elastic member (33). Move in the direction. Therefore, the drag of the friction pad (3) on the reaction part (14) side can be reliably prevented as in the first and second embodiments. As described above, since the abutting member (44) is not provided in the third embodiment, the number of parts and the manufacturing process can be reduced as compared with the first and second embodiments, and the manufacturing cost can be reduced. It can be. In the present embodiment and the first and second embodiments, the drive motor (13) is used as the drive section (8) of the present invention. However, in other different embodiments, other than the drive motor (13). It is also possible to use this drive mechanism as the drive section (8).

1 Caliper body 2, 3 Friction pad
4,5 Pressing member 6 Cylinder hole 7 Advance / retract mechanism 8 Drive unit 10 Disc rotor 11 Support unit 12 Action unit 14 Reaction unit 23 Fixing member 27 Bolt 28, 30 Arm part 32 Sleeve 33 Elastic member 34 Slide pin 35 Shaft part 36 Head Part 41 Bracket 44 Abutting member 45 Contact part

Claims (6)

From the operator, a pair of pressing members that press the friction pads respectively arranged on the action part and the reaction part of the caliper body, an advance / retreat mechanism that is provided in the cylinder hole on the action part side and generates a pressing force on the pressing member, A hydraulic pressure-free machine comprising: a drive unit that drives the advancing / retracting mechanism according to the operation; and a support unit that supports the caliper body so as to be movable in the axial direction of the disk rotor via a slide pin. Type disc brake,
The pressing member on the action part side is formed integrally with the advance / retreat mechanism via a fixing member and is movable in the axial direction of the disc rotor with respect to the caliper body, and the pressing member on the reaction part side is a caliper. It is fixedly arranged on the body and is formed so as to be movable in the axial direction of the disk rotor through the slide pin together with the caliper body, and an elastic member is provided coaxially with the slide pin on the outer periphery of the slide pin. The mechanical disk wherein the caliper body moves toward the disk rotor and compresses and deforms the elastic member, and when the brake is released, the caliper body can be restored to the initial position by the restoring force of the elastic member. brake.   The slide pin comprises a bolt formed by a shaft portion and a head formed at one end of the shaft portion, and a sleeve through which the bolt is inserted, and a bracket in which the tip end side of the shaft portion of the bolt is assembled to a vehicle body A support part is formed by fixing the position of the slide pin to the position of the slide pin. In this support part, the arm part of the caliper body is slidably supported with respect to the slide pin, and the disk of the arm part 2. The mechanical disc brake according to claim 1, wherein the elastic member is disposed between an end opposite to the rotor and a head of the bolt.   3. The mechanical disc brake according to claim 1, wherein the elastic member is a cylindrical rubber material.   2. An abutting member capable of abutting against an abutting portion fixed to a vehicle body when braking is released at an end portion of the arm portion on the disc rotor side so as to project in the axial direction of the disc rotor. 2, or 3 mechanical disc brakes.   5. The mechanical disc brake according to claim 4, wherein the abutting member is capable of adjusting a protruding length of the disc rotor in the axial direction.   6. The mechanical disc brake according to claim 1, wherein the mechanical disc brake is an electric disc brake in which a pressing member is electrically driven.

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