JPH02102934A - Disk brake device for vehicle - Google Patents

Abstract

PURPOSE:To change the set position of a brake bar by separating rotating shaft having the brake lever fixed to a caliper from a cam shaft and interposing a rotation transmission mechanism for rotating the cam shaft between the rotating shaft and the cam shaft. CONSTITUTION:When a brake lever is rotated, a rotating shaft 23 is rotated, a second push rod 25 rotates a cam shaft 21, a first push rod 20 pressed to a disk 3 direction by a cam face 21a presses a sleeve piston 18, an adjuster 14 and a piston 7 to press a friction pad 10 to one side of the disk 3, thereby all the caliper 2 is moved to an operation part 2a side. Then, a reaction part 2b presses other friction pad 11 to the other side of the disk 3. The disk 3 is held and pressed between both the friction pads 10, 11 to carry out braking operation according to mechanical operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle disc brake device equipped with a mechanical actuation mechanism.

[Conventional technology]

For example, this type of disc brake device disclosed in Japanese Patent Application Laid-Open No. 59-58243 has a hydraulic actuation mechanism that operates a first piston fitted into a cylinder hole of a caliper using pressure fluid from a mask cylinder. As a brake mechanism, a bearing part is formed in a direction perpendicular to the cylinder hole of the caliper, a brake lever is fixed to the end of the camshaft that is fitted into the bearing part and projects from the caliper, and the brake lever is mechanically operated. A mechanical actuation mechanism is also provided which moves a second piston engaged with the camshaft via a push rod and pushes the friction pad by rotating the friction pad.

[Problem to be solved by the invention]

By the way, the caliper of a disc brake device is often arranged in a narrow space of a vehicle body, and the brake lever, cable, knuckle, etc. may interfere with other parts.

SUMMARY OF THE INVENTION An object of the present invention is to provide a disc brake for a vehicle in which the position of the brake lever can be changed and interference between the brake lever, cable, knuckle, etc. and other parts is reduced.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention disposes a pushing member that pushes a friction pad in sliding contact with a brake disc on a caliper so as to be movable in the axial direction of the brake disc.
A bearing part is formed in the caliper in a direction perpendicular to the moving direction of the pushing member, a camshaft that engages with the pushing member is inserted into the bearing part via a push rod, and the camshaft is connected to the brake lever. In a vehicle disc brake device that pushes the friction pad by rotating it with between the camshaft and
It is characterized by interposing a rotation transmission mechanism for rotating the camshaft.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to a parking brake mechanism will be described based on the drawings.

1 to 4 show a first embodiment of the present invention,
The caliper 2 of the disc brake 1 has an action part 2a and a reaction part 2b connected across the disc 3 (by a bridge part 2c), and is movable in the axial direction of the disc 3 by a sliding pin 55 on the bracket 4. .

A cylinder hole 6 which is open on the side of the disk 3 is formed in the acting portion 2a, and a tip-shaped piston 7 is fitted into the cylinder hole 6 in a fluid-tight and movable manner. A hydraulic pressure chamber 8 is defined within the mask cylinder 6, and an introduction hole 9 for introducing pressure liquid from a mask cylinder (not shown) opens into the hydraulic pressure chamber 8.

Furthermore, friction pads 10 and 11 are provided on both sides of the disc 3.
is provided movably in the axial direction of the disk 3, and when the hydraulic pressure in the hydraulic chamber 8 increases due to the pressure fluid supplied from the mask cylinder, the friction pad 10 on the piston 7 side is pushed by the piston 7. While being pressed against one side of the disc 3, the reaction force acting on the piston 7 causes the entire caliper 2 to move toward the acting portion 2.
The reaction part 2b of the caliper 2 pushes the other friction pad 11 to press it against the other side of the disc 3,
The disc 3 is compressed between both friction pads 10 and 11 to perform a braking action by hydraulic pressure operation.

An adjuster 14 having an adjustment bolt 12 and an adjustment nut 13 screwed onto the adjustment bolt 12 with a multi-thread screw is built into the hydraulic pressure chamber 8. is urged toward the disk 3 side, and the adjustment bolt 12 is urged by the spring 16 through the bearing 17 toward the opposite side of the disk.

The adjustment nut 13 abuts and engages with the piston 7 to restrict its rotation, and the adjustment bolt 12 has a clutch portion 12a formed at its head that is fitted into the rear part of the cylinder hole 6 so as to be movable in the axial direction. The sleeve piston 18 is frictionally engaged with the clutch portion 12a of the adjustment bolt 12 when the movement distance of the piston 7 becomes larger than a predetermined distance due to wear of the friction pad 10.11. When released, the adjustment bolt 12 rotates and the entire length of the adjuster 14 is extended, thereby changing the return position of the piston 7 to the disk 3 and automatically adjusting to an appropriate braking gap.

The sleeve piston 18 has a piston small diameter portion 18a formed at the rear thereof, which is fluid-tightly fitted into the small diameter portion 6a of the cylinder hole 6. A piston small diameter portion 18a formed at the rear of the sleeve piston 18 is fluid-tightly inserted into the small diameter portion 6a of the cylinder hole 6. A cylindrical bearing portion 19 for inserting the camshaft is formed to communicate with the small diameter portion 6a in the direction of the camshaft.

Further, at the rear end of the small diameter portion 18a of the sleeve piston 18, there is formed a spherical four portion 18b that extends so as to protrude into the bearing portion 19, and engages one end of the first bushing rod 20 on the rear end surface. has been done.

A cylindrical camshaft 21 is connected to a bearing 22 at the rear of the sleeve piston 18 in the bearing portion 19 through which the camshaft is inserted.
Further, a rotating shaft 23 is rotatably fitted and inserted through a bearing 24 below the camshaft 21 apart from the camshaft 21. , a second bushing rod 25 is provided.

A cam surface 21a with which the other end of the first bushing rod 20 engages is formed on the surface of the camshaft 21 facing the sleeve piston 18, and a cam surface 21a, which is engaged with the other end of the first bushing rod 20, is formed on the surface facing the rotation shaft 23.
A cam surface 21b is formed, with which one end of the bushing rod 25 engages.

Further, the rotating shaft 23 is formed with a cam surface 23a that engages with the other end of the second bushing rod 25, and the rotating shaft 23 is connected to the shaft portion 23b by attaching a dust boot 26 to the shaft portion 23b. A return spring 29 is disposed between the brake lever 27 and a stopper pin 28 provided on the caliper 2, and a long nut is inserted into the shaft portion 23b that is fitted into the shaft portion 19 and extends from the bearing portion 19 to the outside of the caliper 2. 30, and a flanged bolt 31 is screwed into the long nut 30.

In this way (by making R, brake lever = 27
When rotated, the rotation shaft 23 rotates, the second bushing rod 25 rotates the camshaft 21, and the first bushing rod 20, pushed in the direction of the disk 3 by the cam surface 21a, moves against the sleeve piston 18. Adjuster 14. The piston 7 is pushed to press the friction pad 10 against one side of the disc 3, and as a result, the entire caliper 2 moves toward the action part 2a, and the reaction part 2b pushes the other friction pad 11, causing the friction pad 10 to come into contact with one side of the disc 3. The disc 3 is pressed against the other side of the friction pad 10, 11, and the disc 3 is pressed between the two friction pads 10 and 11 to perform a braking action by mechanical operation.

FIG. 5 shows a second embodiment of the present invention, in which the caliper 2
A bearing portion 43 in which a camshaft 40, an idler gear 41, and a rotation shaft 42 are disposed is formed at the rear of the camshaft 4.
0 has a gear portion 40a that meshes with the idler gear 41,
The rotation shaft 42 has a gear portion 42 that meshes with the idler gear 41.
a is formed respectively, and a brake lever (not shown) is fixed to the rotating shaft 42.

As a result, when the brake lever is rotated, this rotation is caused by the rotation shaft 42. It is transmitted to the camshaft 40 via the idler gear 41, and performs a braking operation in the same manner as in the first embodiment.

As described above, by configuring as in both embodiments, the arrangement position of the brake lever can be changed, and the degree of freedom in design is increased. Interference with other parts can be avoided.

Furthermore, the parking ratio can be changed by changing the shape of the cam mechanism and the gear ratio of the gear mechanism.

In both of the above embodiments, a cam mechanism and a gear mechanism are used as the rotation transmission mechanism, but a transmission mechanism such as a link mechanism can also have the same effect. Further, although the description has been made using a disc brake that has both a hydraulic actuation mechanism and a mechanical actuation mechanism, the present invention is also applicable to a disc brake that is actuated by mechanical operation.

〔Effect of the invention〕

As described above, the present invention is for a vehicle in which a pushing member for pushing friction pads arranged on both sides of a disc is rotated by a brake lever using a camshaft arranged in a direction perpendicular to the axis of the pushing member. In a disc brake device, a rotating shaft having the brake lever fixed to the caliper is provided separately from the camshaft, and rotation transmission for rotating the camshaft is provided between the rotating shaft and the camshaft. Because the mechanism is interposed, the position of the brake lever can be changed, increasing the degree of freedom in installation.When assembling the caliper, it is sometimes difficult to assemble the brake lever, the cable connected to it, the knuckle, etc., and other parts. Interference can be avoided.

[Brief explanation of drawings]

1 to 4 show a first embodiment of a disc brake in which the present invention is applied to a parking brake mechanism,
Figure 1 is a 1-1 sectional view of Figure 4, Figure 2 is a plan view of the disc brake, Figure 3 is an enlarged front view showing how the brake lever is installed, Figure 4 is a side view of the disc brake, and Figure 4 is a side view of the disc brake. FIG. 5 is a sectional view showing the second embodiment. 1... Disc brake 2... Caliper 3...
・Disc 6...Cylinder hole 7...Viston 10.11...Friction pad 18...Sleeve piston 18b...Rear end 1 of sleeve piston
9... Bearing portion, 43 20... First bushing rod 21.40... Camshaft 23.42... Rotating shaft 25... Second bushing rod 29...
Brake lever patent applicant Nissin Kogyo Co., Ltd. ITI Giken Kogyo Co., Ltd.

Claims (1)

[Claims] 1. A pushing member that pushes a friction pad that slides on the brake disc is disposed on a caliper so as to be movable in the axial direction of the brake disc, and a bearing is mounted on the caliper in a direction perpendicular to the moving direction of the pushing member. a camshaft that engages with the pushing member through a push rod is fitted into the bearing part, and the camshaft is rotated by a brake lever to push the friction pad; In the brake device, a rotating shaft having the brake lever fixedly attached to the caliper is provided separately from the camshaft, and rotation transmission for rotating the camshaft is provided between the rotating shaft and the camshaft. A vehicle disc brake device characterized by having a mechanism interposed therein.