KR20000039044A - Parking brake of disc brake - Google Patents

Abstract

PURPOSE: A parking brake of a disc brake is provided to reduce rear volume of a caliper housing as well as to be easily installed and processed by improving the structure of the parking brake. CONSTITUTION: With stepping on a brake pedal, a master cylinder generates operating hydraulic pressure and the hydraulic pressure is delivered to a pressure chamber(38) through an oil inlet hole(39). The pressure is increased and a piston(37) advances to a disc(30). A caliper housing(33) moves to an operation unit(33a) with reaction and pad plates(31a,31b) are compressed into a disc face. When a driver pulls a parking lever, a parking cable is pulled and a cam shaft(70) rotates with a rotating lever(80). Then, a sliding member(60) is pushed to the disc, guiding a supporting pin(62) along a spiral guiding groove. Thus, the sliding member pushes an operating shaft(43) and the operating shaft pushes the piston through a supporting sleeve(40) in order to compress the pad plates into the disc face.

Description

Parking brake of disc brake

The present invention relates to a disc brake for a vehicle, and more particularly, to a mechanical parking brake device installed in the caliper housing.

In general, disc brakes apply friction pads to both sides of a disc that rotates together with the wheels of the vehicle, thereby braking the vehicle through this friction force.

1 is a cross-sectional view showing the configuration of a conventional disc brake. In the conventional disc brake, a caliper housing 3 is provided to compress a pair of pad plates 2a and 2b provided on both sides of the disc 1, and the caliper housing 3 is operated by hydraulic pressure. The piston 4 is provided.

At this time, a cylinder portion 5 having an opening on the disc 1 side is formed inside the caliper housing 3 so that the piston 4 can be installed, and a cylinder portion 5 inside the cylinder portion 5. A shaft support hole (6) smaller than the diameter of the (6) is formed, and a cam shaft support hole (8) into which the cam shaft (7) of the parking brake is fitted in a direction crossing the shaft support hole at right angles is formed at the rear of the shaft support hole (6). have.

At this time, the piston (4) is provided in a cup shape to form a pressure chamber (9) inside the cylinder (5), the working fluid supplied from the master cylinder (not shown) on one side of the pressure chamber (9) The oil inlet hole 10 is formed to be introduced into the seal. Therefore, the disk brake is braked by pressing the pad plates 2a and 2b when the working fluid flows into the pressure chamber 9 and the piston 4 is advanced.

In addition, a support sleeve 11 having a conical flange portion 11a formed on an outer circumferential surface of the piston 4 is installed, and the support sleeve 11 has a conical flange portion 11a in close contact with an inner surface of the piston 4. The spring washer 12 is provided on the rear surface of the flange portion 11a to prevent the flow and rotation of the support sleeve 11. The spring washer 12 is supported by a fixing ring 13 provided on the inner surface of the piston 4.

In addition, a nut portion 11b is formed at the center of the support sleeve 11, and one end of the operating shaft 14 having the bolt portion 14a formed thereon is fastened to the nut portion, and the other end of the operating shaft is a cylinder portion. It extends inward of the axial support hole 6 formed in the rear of (5). At this time, the operating shaft 14 is inserted into the shaft support hole (6) to make a sliding motion.

A push rod 15 is provided between the cam shaft 7 and the rear end of the working shaft 14 to transmit the movement of the cam shaft 7 to the linear movement of the working shaft 14. At this time, a spherical recess 14b is formed at the rear end of the operation shaft 14 so that the push rod 15 can be supported at one end, and the other end of the push rod 15 is formed at the outer surface of the cam shaft 7. A spherical cam surface 7a on which is supported is formed.

Accordingly, when the cam shaft 7 rotates, the push rod 15 and the operating shaft 14 move forward toward the disk 1 to push the piston 4 to brake the disk 1. do.

In addition, a return spring 16 is installed on the outer surface of the actuating shaft 14 so that the actuating shaft 14 can be restored when the rotational force of the cam shaft 7 is terminated. It is supported by the support plate 14c fixed to the outer surface of 14, and the other end is supported by the cup-shaped support 17 fixed to the inner surface wall of the cylinder 5. As shown in FIG.

In addition, as shown in Figure 2, the rear end of the caliper housing 3, one end of the cam shaft (7) extends outward, the rotation lever 19 is connected to the parking cable 18 to this extension portion ) And a torsion spring 20 for imparting restoring force to the camshaft 7 is provided.

Parking brake device of the conventional disc brake configured as described above, when the parking cable 18 is pulled, the rotating lever 19 is rotated, the cam shaft 7 is rotated while the push rod 15 and the operating shaft 14 The piston 4 is pushed toward the disk 1 so that the brake of the disk 1 is performed.

However, such a conventional parking brake device for a disc brake has a camshaft support hole 8 formed in the caliper housing 3 and a shaft as the installation direction of the camshaft 7 and the installation direction of the operating shaft 14 cross each other. Not only is there a problem that it is difficult to process the paper hole 6 and the like, but there is a problem that the rear end volume of the caliper housing 3 becomes large due to the installation of the camshaft 7.

The present invention is to solve such a problem, an object of the present invention is to improve the structure of the parking brake device installed in the caliper housing, not only easy to process and install, but also to reduce the rear end volume of the caliper housing. It is to provide a parking brake device of the disk brake.

1 is a cross-sectional view showing the structure of a conventional disc brake.

Figure 2 is a view showing the outer end of the conventional disc brake.

3 is a cross-sectional view showing the structure of a disc brake provided with a parking brake apparatus according to the present invention.

4 is a view showing the outer end of the disc brake according to the present invention.

Figure 5 is an enlarged cross-sectional view showing a coupling structure of the cam shaft and the sliding member according to the present invention.

Figure 6 is an exploded perspective view showing the structure of the cam shaft and the sliding member according to the present invention.

Explanation of symbols on the main parts of the drawings

30: disc, 31a, b: pad plate,

33: caliper housing, 34: cylinder portion,

35: second cylinder portion, 36: camshaft support ball,

37: piston, 38: pressure chamber,

39: oil inlet hole, 40: support sleeve,

41: spring washer, 42: retaining ring,

43: working shaft, 45: return spring,

46: cup-shaped support, 60: sliding member,

61: hollow part, 62: support pin,

70: camshaft, 72: spiral guide groove,

80: pivot lever, 81: torsion spring,

83: parking cable.

The present invention for achieving the above object is a caliper housing consisting of a working portion and a reaction portion to compress the pad plate provided on both sides of the disk to the disk, a cylinder portion formed inside the working portion of the caliper housing, the cylinder portion A piston which is slidably installed inward to push the pad plate by the hydraulic and mechanically generated thrust therein, and one end of the piston to push the piston toward the disc to the inner central portion of the piston A disc brake having an operating shaft coupled via a support sleeve, the other end of which extends toward the rear end of the caliper housing, and a parking brake device for pushing the operating shaft toward the disc.

The parking brake device has a second cylinder portion formed in series with the cylinder portion at the rear of the cylinder portion, and is installed in the second cylinder portion so as to be slidable, and one end thereof is provided in contact with an end of the operating shaft. A sliding member having a cylindrical hollow portion, and one end of which is inserted into the hollow portion of the sliding member and a spiral guide groove is formed on an outer surface of the entering portion, and the other end extends outward through the rear end of the caliper housing. A cam shaft and a support pin formed to protrude from an inner surface of the sliding member so as to push the operating shaft by linear movement when the cam shaft is rotated, and a support pin which is caught by the spiral guide groove of the cam shaft. to be.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Figure 3 is a cross-sectional view showing the structure of the disk brake is installed parking brake apparatus according to the present invention, Figure 4 is a view showing the outer end of the disk brake according to the present invention, Figure 5 is a camshaft and sliding member according to the present invention An enlarged cross-sectional view showing the coupling structure of 6 is an exploded perspective view showing the structure of the cam shaft and the sliding member according to the present invention.

As shown therein, the caliper housing of the disc brake according to the present invention includes an actuating portion 33a and a reaction portion 33b for pressing a pair of pad plates 31a and 31b disposed opposite to the disc 30. It is configured, and the action portion and the reaction portion are connected to the bridge portion 33c across the disc. And, although not shown, the caliper housing 33 is coupled to the carrier to be fixed to the vehicle body by sliding pins to enable sliding in the axial direction of the disk 30.

An actuating portion 33a of the caliper housing 33 is formed with a cylinder portion 34 with an opening on the disc 30 side, and a sliding member 60 according to the present invention is fitted into the inner rear portion of the cylinder portion 34. The cylindrical second cylinder portion 35 smaller than the diameter of the cylinder portion 34 is formed. Then, at the rear of the second cylinder portion 35, a cam shaft support hole 36 into which the cam shaft 70 of the parking brake is fitted is formed. At this time, the cylinder portion 34, the second cylinder portion 35, and the cam shaft support hole 36 are formed on the same axis line.

In addition, a cup-shaped piston 37 is slidably installed in the cylinder part 34 to form a pressure chamber 38 inside the cylinder 34, and a master on one rear side of the cylinder part 34. The oil inflow hole 39 is formed to allow the working fluid supplied from the cylinder (not shown) to flow into the pressure chamber 38. Accordingly, the disk brake is braked when the working fluid flows into the pressure chamber 38 and the piston 37 is advanced, thereby compressing the pad plates 31a and 31b.

In addition, a support sleeve 40 having a conical flange portion 40a formed on an outer circumferential surface thereof is provided inside the piston 37. At this time, the support sleeve 40 is installed in the conical flange portion 40a is in close contact with the inner surface of the piston 37, the spring washer (150) to prevent the flow and rotation of the support sleeve 40 on the rear surface of the flange portion (40a) 41 is installed, the spring washer is supported by a fixing ring 42 installed on the inner surface of the piston (37).

In addition, the operating shaft 43 for pushing the support sleeve 40 is coupled to the center of the support sleeve 40. The working shaft 43 has a male screw portion 43a formed on the outer circumferential surface thereof and is fastened to the nut portion 40b formed at the center of the support sleeve 40, and a flat flange portion 43b is formed at the rear end portion thereof.

The second cylinder part 35 and the camshaft support hole 36 are provided with a cup-shaped sliding member 60 and a camshaft 70 by the parking brake device according to the present invention.

5 and 6, the sliding member 60 is provided in a cup shape having a cylindrical hollow portion 61 formed therein, such that the opened portion faces the camshaft support hole 36 toward the rear side. The closed portion is installed in close contact with the flange portion 43b of the operating shaft 43. In addition, the outer surface of the sliding member 60 is fitted to the second cylinder portion 35 and is supported to slide in the axial direction. At this time, the outer surface of the sliding member 60 is formed with an anti-rotation surface 62 is formed in a plane to prevent the rotation of the sliding member 60, the plane of the shape corresponding to the inner surface of the second cylinder (35) Is provided.

The cam shaft 70 has a cylindrical cam 71 fitted to the hollow portion 61 of the sliding member 60 at one end thereof, and the other end of the cam shaft 70 penetrates the cam shaft support hole 36. It extends out of the caliper housing 33. At this time, the cylindrical cam 71 has a spiral guide groove 72 is formed on the outer circumferential surface. In addition, a support pin 62 is provided on the inner circumferential surface of the hollow part 61 of the sliding member 60 to protrude toward the inner surface and to be caught by the spiral guide groove 72. The support pin 62 is installed to penetrate the inner and outer surfaces of the sliding member 60.

Therefore, when the cam shaft 70 rotates, the support pin 62 is guided along the spiral guide groove 72 so that the sliding member 60 linearly moves in the axial direction while the flange portion of the operating shaft 43 is rotated. It is possible to push 43b.

In addition, a return spring 45 is installed on the outer surface of the actuating shaft 43 so that the actuating shaft 43 can be returned when the rotational force of the cam shaft 70 is terminated. It is supported by the flange part 43b formed in the one end part of 43, and the other end part is supported by the cup-shaped support 46 fixed to the inner surface wall of the cylinder 34. As shown in FIG. At this time, the cup-shaped support 46 is to be fixed through the annular fixing member 47 fixed to the inner wall of the cylinder.

And, as shown in Figure 4, the cam lever 70, which penetrates the cam shaft support hole 36 and extends outward from the rear end of the caliper housing 33, is rotated by a rotation lever 80 for rotating the cam shaft 70. Is installed, the parking lever 80 is connected to the parking cable (83). In addition, the camshaft 70 is provided with a torsion spring 81 that provides a restoring force so that the camshaft 70 can be restored to its original state when the pulling of the parking cable 83 is released.

The following describes the operation of the disc brake according to the present invention configured as described above.

When the driver presses the brake pedal, the hydraulic pressure is generated in the master cylinder, and the hydraulic pressure is transmitted to the pressure chamber 38 inside the cylinder through the oil inlet hole 39 formed at one side of the caliper housing 33. At this time, when the pressure in the pressure chamber 38 rises, the piston 37 moves forward toward the disc 30, and on the contrary, the caliper housing 33 moves toward the acting portion 33a by reaction to both sides of the disc 30. The pad plates 31a and 31b installed on the disk surface are pressed to the disk surface to brake the vehicle.

On the other hand, when the driver pulls the parking lever when parking, the parking cable 83 is pulled while the cam shaft 70 rotates together with the rotation lever 80 at the rear end of the caliper housing 33. At this time, while the support pin 62 is caught in the spiral guide groove 72 of the cylindrical cam 71 is guided along the spiral guide groove, the sliding member 60 is pushed toward the disk 30.

Accordingly, the sliding member 60 pushes the operating shaft 43, and the operating shaft 43 pushes the piston 37 through the support sleeve 40, so that the pad plates 31a are installed on both sides of the disk 30. , 31b) is pressed against the disk surface to brake.

Then, when the pulling of the parking cable 83 is released, the camshaft 70 and the rotation lever 80 are returned to their original state by the restoring force of the torsion spring 81 provided at the rear end of the camshaft 70, thereby sliding. Member 60 is retracted. In addition, the working shaft 43 is also pushed back by the return spring 45 is installed on the outer peripheral portion, at this time braking is terminated while the piston 37 connected to the support sleeve 40 retreats.

As such, the parking brake device of the disc brake according to the present invention is able to push the operating shaft 43 by the action of the cam shaft 70 and the sliding member 60 installed on the same axis as the operating shaft 43 and smooth. Braking is achieved. In addition, since they are installed on the same axis, not only the rear end volume of the caliper housing 33 is reduced, but also easy to manufacture and install.

As described above in detail, the parking brake apparatus of the disc brake according to the present invention is installed on the same axis as the operating shaft and is fitted to the hollow member of the sliding member and the sliding member provided with a cylindrical hollow portion on the inner side, and is also the same shaft. Camshafts are provided on the ship, and a spiral guide groove is formed on the camshaft so that the sliding member moves linearly when the camshaft is rotated, and the sliding member is provided with a support pin that is caught by the spiral guide groove. Therefore, it is possible to push the operation shaft by the action of the cam shaft and the sliding member, so that the braking is not only smoothly, but also the rear end volume of the caliper housing is reduced by installing them on the same axis, and it is easy to manufacture and install the parking brake device. There is an advantage to doing this.

Claims (3)

The caliper housing 33 which consists of the acting part 33a and the reaction part 33b so that the pad plates 31a and 31b provided in the both sides of the disc 30 may be crimped | bonded to the disc, and the acting part 33a of the caliper housing A cylinder 37 formed inside, a piston 37 slidably installed inside the cylinder to push the pad plate by a hydraulic or mechanically generated thrust, and the piston An actuating shaft 43 having one end coupled to the inner central portion of the piston via a support sleeve 40 so as to push toward the disc, and the other end extending toward the rear end of the caliper housing 33; In a disk brake having a parking brake device for pushing the shaft toward the disk 30, The parking brake device is provided with a second cylinder portion 35 formed in series with the cylinder portion at the rear of the cylinder portion 34, and is slidably installed in the second cylinder portion, and one end thereof is the operating shaft. An outer surface of the sliding member 60 installed in contact with an end of the 43 and having a cylindrical hollow portion 61 formed therein, and one end of which is entered into the hollow portion 61 of the sliding member and entered. A spiral guide groove 72 is formed in the cam shaft 70, the other end of which extends outwardly through the rear end of the caliper housing 33, and the sliding member moves linearly when the cam shaft is rotated. And a support pin (62) formed to protrude from the inner surface of the sliding member so as to push the shaft, the support pin (62) engaging the spiral guide groove of the cam shaft. The method of claim 1, The cam shaft (70) is a parking brake device for a disc brake, characterized in that the axis line is installed so as to be parallel to the axis line of the working shaft (43). The method of claim 1, The outer surface of the sliding member 60 and the inner surface of the second cylinder portion 35, the anti-rotation surface 62 of the disc brake, characterized in that the plane is formed so as to prevent the rotation of the sliding member 60 is provided Brake device.