JP5366753B2 - Disc brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disc brake device adapted to reduce the number of parts and the number of kinds of assemblies. <P>SOLUTION: As a push plate 47, a rod 48, a displacement transmission mechanism 13 and a strut 6 are internally mounted in a caliper body 37 and a conventional chamber housing and a part for sealing intervened between the caliper body and the chamber housing are not required, the number of parts can be decreased and the size of the device can be reduced. As a diaphragm 43 intervened between the caliper body 37 and a brake chamber 42 plays a role to prevent intrusion of water and dust into the caliper body 37, a simpler sealing structure can be provided. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a pneumatic brake disc brake device.

  FIG. 3 shows an example of a conventional disc brake device. The disc rotor 1 rotates integrally with a wheel, and the disc rotor 1 is disposed on the vehicle center side and has openings 2 and 3 at both ends in the vehicle width direction. A hollow caliper body 4 having a bush 5, a bush 5 fitted into the opening 2 on the vehicle outer side of the caliper body 4, a strut 6 assembled to the bush 5 so as to be movable in the vehicle width direction, and the strut 6 An inner brake pad 7 that is mounted at the tip and faces the surface of the disc rotor 1 on the vehicle center side, a bridge portion 8 that extends from the caliper body 4 over the disc rotor 1 to the outside of the vehicle, A claw portion 9 that protrudes downward from the tip, an outer brake pad 10 that is mounted on the claw portion 9 and faces the outer surface of the disc rotor 1, and a robot that can reciprocate in the vehicle width direction. An actuator 12 having a de 11 is incorporated in the caliper body 4 to move the rod 11 of the actuator 12 and a displacement transmission mechanism 13 for transmitting to the strut 6. In FIG. 3, the left side is the vehicle outer side and the right side is the vehicle center side, and the caliper body 4 is supported so as to be displaceable in the vehicle width direction with respect to an axle (not shown).

  The actuator 12 has a chamber 14 having an opening 14 in the caliper body 4 having a shape corresponding to the opening 3 in which the bush 5 is not fitted, on the vehicle outer side, and an opening 15 having a diameter larger than the opening 14 on the vehicle center side. A housing 16 and an opening 17 having a shape corresponding to the opening 15 of the chamber housing 16 are provided on the vehicle outer side, and an air supply / exhaust port 18 to which an air pressure application hose (not shown) is connected is provided on the vehicle center side. A brake chamber 19, a diaphragm 20 interposed between the chamber housing 16 and the brake chamber 19 and closing the openings 15, 17, a flange 21 formed over the entire outer surface of the vehicle housing side end of the chamber housing 16, and the brake The chamber 19 is tightly attached to the diaphragm 20 with a flange 22 formed over the entire outer periphery of the vehicle outer side end. A clamping band 23 to a push plate 24 that is fixed to a surface of the vehicle outer side of the to diaphragm 20 positioned in the chamber housing 16, and a rod 11 provided on the push plates 24 as main components. The rod 11 extends from the push plate 24 to the vehicle outer side, and the tip end portion enters the caliper body 4 through the opening 3 through the opening 14 of the chamber housing 16.

  The chamber housing 16 of the actuator 12 is fastened to the caliper body 4 by bolts 25. A return spring 26 is interposed between the wall surrounding the opening 14 of the chamber housing 16 in the circumferential direction and the push plate 24 so as to surround the rod 11, and the push plate 24 is inserted into the diaphragm 20 by the return spring 26. It is urged to the side. A hole 27 for allowing air to enter and exit is formed in the chamber housing 16 downward.

  The intermediate portion in the longitudinal direction of the rod 11 is surrounded by the boot 28 in the circumferential direction. The vehicle center side end of the boot 28 is in close contact with the rod 11, and the vehicle outer side end of the boot 28 is inscribed and fitted to the entire circumference of the opening 14 of the chamber housing 16. A seal ring 29 is fitted into the opening 3 of the caliper main body 4, and the seal ring 29 and the vehicle outer end of the boot 28 are in close contact with each other, and the caliper main body 4 and the chamber housing 16 are inserted between the caliper main body 4 and the chamber housing 16. Inflow of outside air into the inner space of the boot 28 is prevented.

  The displacement transmission mechanism 13 includes a fan-shaped cam body 30 that can tilt around a virtual point X close to the vehicle center side end of the strut 6 in the caliper body 4, a cam attached to the cam body 30, and the vehicle of the strut 6. A main component is a cylindrical eccentric portion 31 that abuts on the end portion on the center side, a lever 32 that has a proximal end portion connected to the cam body 30, and a distal end portion of the rod 11 of the actuator 12 abuts on the distal end portion. Yes. The eccentric part 31 is eccentric with respect to the virtual point X which is the tilt center of the cam main body 30, as the name indicates. An annular seat 33 is provided at the vehicle center side end of the strut 6, and a return spring 34 is provided between the seat 33 and the end surface of the bush 5 fitted in the opening 2 of the caliper body 4 on the vehicle body center side. Is disposed so as to surround the strut 6, and the strut 6 is urged by the return spring 34 toward the eccentric portion 31 attached to the cam body 30.

  When the space surrounded by the brake chamber 19 and the diaphragm 20 is atmospheric pressure, the diaphragm 20 has a flat shape, and the push plate 24 and the rod 11 are urged toward the center of the vehicle body by the restoring force of the return spring 26. The restoring force of the return spring 34 urges the strut 6 and the inner brake pad 7 toward the center of the vehicle body, and the reaction force causes the bush 5, the caliper body 4, the bridge portion 8, the claw portion 9, and the outer brake pad 10 to move to the vehicle. The brake pads 7 and 10 are urged outward and are separated from the disk rotor 1. Further, the strut 6 urges the eccentric portion 31 of the displacement transmission mechanism 13 toward the center of the vehicle, and a force acts to tilt the cam body 30 counterclockwise. It is pressed against the tip of the rod 11.

  When air pressure is applied to the space surrounded by the brake chamber 19 and the diaphragm 20 from the air supply / exhaust port 18, the diaphragm 20 has a shape that swells outward from the vehicle, and against the restoring force of the return spring 26, The rod 11 is urged outward of the vehicle body, the tip of the rod 11 urges the tip of the lever 32 of the displacement transmission mechanism 13 outward of the vehicle, and the cam body 30 tilts counterclockwise. Further, when the cam body 30 is tilted, the eccentric portion 31 protrudes the strut 6 and the inner brake pad 7 to the outside of the vehicle against the restoring force of the return spring 34, and by this reaction force, the bush 5, caliper body 4, bridge The portion 8, the claw portion 9, and the outer brake pad 10 are urged toward the vehicle center side, and both the brake pads 7 and 10 are in a state of sandwiching the disc rotor 1, and the rotation of the disc rotor 1 is suppressed.

  Thereafter, when the space surrounded by the brake chamber 19 and the diaphragm 20 is opened and returned to the atmospheric pressure, the diaphragm 20 becomes flat and the brake pads 7 and 10 are restored by the restoring force of the return springs 26 and 34. Move away from the disk rotor 1.

  The air existing in the space surrounded by the chamber housing 16, the diaphragm 20, and the boot 28 is discharged out of the chamber housing 16 through the hole 27 when the diaphragm 20 swells to the vehicle outer side during braking. When the diaphragm 20 becomes flat as the brake is released, external air enters the chamber housing 16 through the hole 27.

  As a prior art document related to such a disc brake device, there is the following Patent Document 1.

JP 2000-027908 A

  The disc brake device shown in FIG. 3 employs a structure in which the chamber housing 16 of the actuator 12 is fastened to the caliper body 4 with bolts 25, so that the soundness of the components of the displacement transmission mechanism 13 and the movable parts such as the strut 6 is maintained. In order to do this, it is necessary to prevent water and dust from entering the caliper body 4.

  Therefore, although the boot 28 and the seal ring 29 described above prevent the outside air from flowing into the caliper main body 4, there is a demand for reducing the number of parts and simplifying the seal structure.

  Further, in order to set the braking force distribution of the disc brake device to an appropriate numerical value for each vehicle type, it is necessary to change the actuator 12 to one having a different diaphragm diameter, which increases the types of assemblies.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a disc brake device that can reduce the number of parts and the type of assembly.

In order to achieve the above object, a disc brake device according to the present invention has a hollow shape in which a strut for pressing a brake pad against a disc rotor is assembled at one end so as to be slidable in the vehicle width direction and has an opening at the other end. A caliper body, a flange formed over the entire outer circumference of the other end of the caliper body, an opening having a shape corresponding to the opening of the caliper body at one end, and a supply / exhaust port for applying air pressure to the other end. A brake chamber, a flange formed over the entire outer circumference of one end of the brake chamber, an opening at the other end of the caliper body, and an opening at one end of the brake chamber interposed between the caliper body and the brake chamber. Fasteners that attach the diaphragm, the flange at the other end of the caliper body, and the flange at the one end of the brake chamber to the diaphragm A push plate positioned in the caliper body and fixed to the outer surface of the diaphragm, and provided so as to protrude from the push plate toward the outer side of the vehicle and follow the deformation and restoration of the diaphragm. A rod that moves in the vehicle width direction, a seat provided in the caliper body, a return spring disposed between the seat and the push plate , and provided in the caliper body and transmits the movement of the rod to the strut. A displacement transmission mechanism,
The inner space by the caliper body and the diaphragm, a push plate, place the rod, a return spring, a displacement transmitting mechanism.

More specifically, a hollow caliper in which a strut for pressing an inner brake pad against the surface of the disk rotor on the vehicle center side at one end is slidably assembled in the vehicle width direction and has an opening at the other end. A main body, a bridge portion extending from the caliper main body to the vehicle outer side through the disk rotor, a claw portion projecting downward from a tip of the bridge, and a vehicle outer side of the disk rotor mounted on the claw portion An outer brake pad facing the surface, a flange formed over the entire outer circumference of the other end of the caliper body, and an opening having a shape corresponding to the opening of the caliper body at one end and supplying and exhausting air pressure A brake chamber having a mouth at the other end, a flange formed over the entire outer circumference of one end of the brake chamber, and a caliper body and the brake chamber. A diaphragm that closes the opening at the other end of the caliper body and the opening at one end of the brake chamber, a fastener that is in close contact with the diaphragm across the flange at the other end of the caliper body and the flange at the one end of the brake chamber, and is located within the caliper body And a push plate fixed to the surface of the diaphragm on the vehicle outer side, and provided so as to protrude toward the vehicle outer side from the push plate and move in the vehicle width direction following the deformation and restoration of the diaphragm. A rod, a seat provided in the caliper body, a return spring disposed between the seat and the push plate, and a displacement transmission mechanism provided in the caliper body and transmitting the movement of the rod to the strut,
A structure in which a push plate, a rod, a return spring, and a displacement transmission mechanism are arranged in the internal space formed by the caliper body and the diaphragm is adopted.

  According to the disc brake device of the present invention described above, the following various excellent effects can be obtained.

  (1) Since the push plate, rod, displacement transmission mechanism, and strut are built in the caliper body, the conventional chamber housing and the sealing parts that existed between the caliper body and the chamber housing are no longer required. Therefore, the number of parts can be reduced and the apparatus can be downsized.

  (2) The diaphragm interposed between the caliper body and the brake chamber has the role of preventing the intrusion of water and dust into the caliper body in addition to converting the pressure change into reciprocating motion and transmitting it to the brake pad. Therefore, the seal structure can be simplified.

  (3) Since the diaphragm used in the disc brake device has a maintenance practice such that it is periodically replaced, the replacement of the diaphragm ensures the sealing performance between the caliper body and the brake chamber.

  (4) Setting the brake force distribution of the disc brake device to an appropriate value for each vehicle type can be handled by changing the diameter of the push plate, so that the types of assemblies do not increase.

It is a transverse cross section of the 1st example of an embodiment which carries out the present invention. It is a cross-sectional view of the second example of the embodiment for carrying out the present invention. It is a cross-sectional view of a conventional example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a first example of an embodiment of the present invention. A disk rotor 1 that rotates integrally with a wheel, and is disposed on the vehicle center side of the disk rotor 1 and has openings at both ends in the vehicle width direction. A hollow caliper main body 37 having 35, 36, a bush 5 fitted in an opening 35 on the vehicle outer side of the caliper main body 37, a strut 6 assembled to the bush 5 so as to be movable in the vehicle width direction, An inner brake pad 7 attached to the front end of the strut 6 and facing the surface of the disc rotor 1 on the vehicle center side, a bridge portion 38 extending from the caliper body 37 over the disc rotor 1 to the vehicle outer side, A claw portion 39 projecting downward from the tip of the bridge portion 38; an outer brake pad 10 mounted on the claw portion 39 and facing the outer surface of the disc rotor 1; An air supply / exhaust port 41 having an opening 40 having a shape corresponding to the opening 36 in which the bush 5 is not fitted in the main body 37 on the vehicle outer side and to which a pneumatic pressure hose (not shown) is connected. A brake chamber 42 provided on the center side, a diaphragm 43 interposed between the caliper main body 37 and the brake chamber 42 and closing the openings 36, 40, and a flange formed over the entire outer surface of the end of the caliper main body 37 at the vehicle center 44 and a brake chamber 42, and a split annular clamp band 46 which is in close contact with the diaphragm 43 with a flange 45 formed over the entire outer periphery of the outer side end of the vehicle, and a diaphragm 43 positioned outside the vehicle 43 in the caliper body 37. A push plate 47 fixed to the side surface, and projecting outward from the push plate 47 A rod 48 that moves in the vehicle width direction following the deformation and restoration of the diaphragm 43, and a displacement transmission mechanism 13 that is incorporated in the caliper body 37 and transmits the movement of the rod 48 to the strut 6. Yes. In FIG. 1, the left side is the vehicle outer side and the right side is the vehicle center side, and the caliper body 37 is supported so as to be displaceable in the vehicle width direction with respect to an accelerator (not shown).

  The caliper body 37 is provided with an annular seat 49 extending along the inner surface, and a return spring 50 is interposed between the seat 49 and the push plate 47 so as to surround the rod 48. The plate 47 is urged toward the diaphragm 43 by a return spring 50.

  The displacement transmission mechanism 13 includes a fan-shaped cam body 30 that can be tilted around a virtual point X near the vehicle center side end of the strut 6 in the caliper body 37, a vehicle attached to the cam body 30, and the strut 6 vehicle. The main components are a cylindrical eccentric portion 31 that comes into contact with the central end portion, a lever 32 whose base end portion is connected to the cam main body 30, and the distal end portion of the rod 48 comes into contact with the distal end portion. The eccentric part 31 is eccentric with respect to the virtual point X which is the tilt center of the cam main body 30, as the name indicates. An annular seat 33 is provided at the vehicle center side end portion of the strut 6, and a return spring 34 is provided between the seat 33 and the end surface of the bush 5 fitted in the opening 35 of the caliper body 37 on the vehicle body center side. Is disposed so as to surround the strut 6, and the strut 6 is urged by the return spring 34 toward the eccentric portion 31 attached to the cam body 30.

  When the space surrounded by the brake chamber 42 and the diaphragm 43 is atmospheric pressure, the diaphragm 43 has a flat shape, and the push plate 47 and the rod 48 are urged toward the center of the vehicle body by the restoring force of the return spring 50. The restoring force of the return spring 34 urges the strut 6 and the inner brake pad 7 toward the center of the vehicle body. By this reaction force, the bush 5, the caliper body 37, the bridge portion 38, the claw portion 39, and the outer brake pad 10 are The brake pads 7 and 10 are urged outward and are separated from the disk rotor 1. Further, the strut 6 urges the eccentric portion 31 of the displacement transmission mechanism 13 toward the vehicle center, and a force acts to tilt the cam body 30 counterclockwise, so that the tip end portion of the lever 32 is pushed to the push plate 47. The rod 48 is pressed against the tip portion of the rod 48.

  When air pressure is applied to the space surrounded by the brake chamber 42 and the diaphragm 43 from the air supply / exhaust port 41, the diaphragm 43 has a shape that swells outward from the vehicle, and the push plate 47 resists the restoring force of the return spring 50. The rod 48 is urged outward of the vehicle body, the tip of the rod 48 urges the tip of the lever 32 of the displacement transmission mechanism 13 outward of the vehicle, and the cam body 30 tilts counterclockwise. Further, when the cam body 30 tilts, the eccentric portion 31 protrudes the strut 6 and the inner brake pad 7 outwardly of the vehicle against the restoring force of the return spring 34, and this reaction force causes the bush 5, caliper body 37, bridge The portion 38, the claw portion 39, and the outer brake pad 10 are urged toward the center of the vehicle, and both the brake pads 7 and 10 are in a state of sandwiching the disc rotor 1 to inhibit the rotation of the disc rotor 1.

  Thereafter, when the space surrounded by the brake chamber 42 and the diaphragm 43 is opened and returned to the atmospheric pressure, the diaphragm 43 becomes flat and the brake pads 7 and 10 are restored by the restoring force of the return springs 50 and 34. Move away from the disk rotor 1.

  3 employs a structure in which the chamber housing 16 of the actuator 12 is fastened with the bolt 25 to the caliper body 4 in which the strut 6 and the displacement transmission mechanism 13 are housed. In order to prevent water and dust from entering the caliper body 4 with a seal ring 29 and a boot 28 interposed between the push plate and the chamber housing 16, in the disc brake device shown in FIG. 47, the rod 48, the displacement transmission mechanism 13, and the strut 6 are built in the caliper body 37, so parts corresponding to the chamber housing 16, the bolt 25, the seal ring 29, and the boot 28 become unnecessary, and the number of parts is reduced. The size of the apparatus can be reduced.

  The diaphragm 43 interposed between the caliper main body 37 and the brake chamber 42 converts the air pressure change in the brake chamber 42 into a reciprocating motion and transmits it to the brake pads 7 and 10. Since it plays the role of preventing water and dust from entering the inside, the seal structure can be simplified. Since the diaphragm 43 used in the disc brake device has a maintenance practice of periodically replacing the diaphragm 43, the replacement of the diaphragm 43 ensures the sealing performance between the caliper body 37 and the brake chamber 42.

  In the conventional disc brake device shown in FIG. 3, the air existing in the space surrounded by the chamber housing 16, the diaphragm 20, and the boot 28 is discharged to the outside during braking, and the outside air enters the space when the braking is released. For this purpose, the hole 27 is formed in the chamber housing 16, but in FIG. 1, the internal space of the caliper body 37 closed by the diaphragm 43 is surrounded by the chamber housing 16, the diaphragm 20, and the boot 28. Since it is larger than the volume of the space, the deformation of the diaphragm 43 at the time of braking and the restoration of the diaphragm 43 at the time of releasing the brake are not hindered without making a hole for the air in / out of the caliper body 37. .

  Furthermore, when the braking force distribution of the disc brake device is set to an appropriate value for each vehicle type, it can be handled by changing the diameter of the push plate 47, so that the types of assemblies do not increase.

  FIG. 2 shows a second example of an embodiment for carrying out the present invention. In the figure, the same reference numerals as those in FIG. In the disc brake device shown in FIG. 2, instead of the flange 44 of FIG. 1, a flange 51 is formed over the entire outer surface of the caliper body 37 at the vehicle center side end. The flange 51 has a cross-sectional shape in which the outer edge portion of the outer surface of the diaphragm 43 and the outer peripheral surface are fitted. Further, a plurality of bolts 52 are used instead of the clamp band 46 of FIG. A diaphragm 43 is interposed between the caliper body 37 and the brake chamber 42 so as to close the opening 36 of the caliper body 37 and the opening 40 of the brake chamber 42, and the flange 51 on the caliper body 37 side and the brake chamber 42 side. The flange 45 is fastened by a plurality of bolts 52 so that the diaphragm 43 is in close contact with the flanges 51 and 45.

  Operation when air pressure is applied to the space surrounded by the brake chamber 42 and the diaphragm 43 from the air supply / exhaust port 41, and operation when the space surrounded by the brake chamber 42 and the diaphragm 43 is opened to return to the atmospheric pressure Is the same as that of the disc brake device shown in FIG. 1, and the disc brake shown in FIG. 2 can provide the same operational effects as those shown in FIG.

  It should be noted that the disc brake device of the present invention is not limited to the above-described embodiments, and it is needless to say that various changes can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Disc rotor 6 Strut 7 Inner brake pad 10 Outer brake pad 13 Displacement transmission mechanism 36 Opening 37 Caliper main body 38 Bridge part 39 Claw part 40 Opening 41 Air supply / exhaust port 42 Brake chamber 43 Diaphragm 44 Flange 45 Flange 46 Clamp band 47 Push plate 48 rod
49 seats
50 Return spring 51 Flange

Claims (2)

A hollow caliper body having a strut for pressing the brake pad against the disc rotor at one end portion slidably assembled in the vehicle width direction and having an opening at the other end portion, and the entire outer periphery of the other end of the caliper body A brake chamber having an opening having a shape corresponding to the opening of the caliper body at one end and an air supply / exhaust port for imparting air pressure at the other end; A flange formed over the diaphragm, a diaphragm interposed between the caliper body and the brake chamber and closing the opening at the other end of the caliper body and the opening at one end of the brake chamber; a flange at the other end of the caliper body and a flange at one end of the brake chamber A fastener that is in close contact with the diaphragm across the vehicle, and a vehicle outer side of the diaphragm located in the caliper body A push plate fixed to the face, and a rod which moves to follow the deformation and restoration of and the diaphragm is provided so as to protrude toward from the push plate to the vehicle outer side in the vehicle width direction, provided in the caliper body And a return spring disposed between the seat and the push plate, and a displacement transmission mechanism provided in the caliper body and transmitting the movement of the rod to the strut.
A disc brake device , wherein a push plate, a rod, a return spring, and a displacement transmission mechanism are arranged in an internal space formed by the caliper body and the diaphragm . A hollow caliper main body having a strut for pressing an inner brake pad on one end of the disc rotor against the surface of the disc rotor on the vehicle center side so as to be slidable in the vehicle width direction, and having an opening at the other end. A bridge portion that extends from the top of the disk rotor to the vehicle outer side, a claw portion that protrudes downward from the tip of the bridge, and an outer that is mounted on the claw portion and faces the outer surface of the disk rotor A brake pad, a flange formed over the entire outer periphery of the other end of the caliper body, an opening having a shape corresponding to the opening of the caliper body at one end, and an air supply / exhaust port for applying air pressure at the other end A caliper body interposed between the caliper body and the brake chamber. A diaphragm that closes the opening at the end and the one end of the brake chamber, a fastener that is in close contact with the diaphragm across the flange at the other end of the caliper body and the flange at the one end of the brake chamber, and a diaphragm that is positioned within the caliper body a push plate fixed to the surface of the vehicle outer side, and a rod for moving the vehicle width direction to follow the deformation and restoration of and the diaphragm is provided so as to protrude toward from the push plate to the vehicle outer side, wherein A seat provided in the caliper body, a return spring disposed between the seat and the push plate, and a displacement transmission mechanism provided in the caliper body and transmitting the movement of the rod to the strut,
A disc brake device , wherein a push plate, a rod, a return spring, and a displacement transmission mechanism are arranged in an internal space formed by the caliper body and the diaphragm .

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