JPH0329264Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improved mechanism for handbrakes installed in automobiles.

BACKGROUND TECHNOLOGY The braking mechanism of a conventional automobile handbrake has a structure in which the end of a cable wire for operating a braking unit consisting of a brake shoe and a cam that operates the same is locked at a predetermined position on a brake lever. It was hot.

Problems to be solved by the invention Conventional handbrakes had the above-mentioned structure, but had the disadvantage that a large amount of force was required to operate the brake lever during braking, in which the brake shoe was brought into pressure contact with the brake drum. It may be possible to add a master bag to reduce the operating force, but this would result in mechanical complexity, resulting in an increase in assembly steps and production costs. This invention connects the connection point of the cable wire to the brake lever so that it can be freely displaced according to the operation of the lever, and automatically changes the length from the center of rotation of the lever to the connection point of the cable wire. The purpose of this structure is to reduce the force required to operate the lever during braking.

Means for Solving the Problems The configuration of the present invention will be explained with reference to the drawings. One end of the guide plate 2 having an elongated hole 2a is rotatably attached, and the rear end 4b of the link 4 is slidably supported by the shaft 5 in the guide elongated hole 2a, and the front end 4a of the link 4 is supported in the guide elongated hole 2a. Arm 1 of lever 1
The cable wire 8 is rotatably attached to the middle of the link 4 by a shaft 6, and the front end 8a of a cable wire 8 whose rear end 8b is connected to the brake part 7 is connected to the rear end 4b of the link 4. A compression spring 9 having outward elasticity is interposed between the receiving portion 1d protruding from the tip of the leg portion 1c of the lever 1 and the tip portion 2b of the guide plate 2.

In the figure, the braking unit 7 includes a link 7a, a wire 7b,
It consists of a cam 7c and a brake shoe 7d. D is a brake drum.

In addition, what is shown in the drawing is lever 1 and guide plate 2.
Although a configuration is shown in which the guide plate 2 is coaxially supported by a shaft 3, the rotating shaft of the guide plate 2 may be provided in relation to the lever 1 at a position close to the shaft 3.

Function Next, the function of the present invention will be explained with reference to the drawings. When the lever 1 is in the down position before the braking operation shown in FIG. 1, the compression spring 9 pushes the tip 2b of the guide plate 2 forward by its outward elasticity.
The guide plate 2 is pushed forward about the shaft 3.

As shown in Fig. 2, in order to apply the brake, as the arm 1b of the lever 1 is grasped and the lever 1 is pulled up about the shaft 3, which is the axis O, the leg 1c rotates counterclockwise, and the receiving part 1d and The compression spring 9 is also displaced counterclockwise. The guide plate 2 is also pushed by the elasticity and displacement of the compression spring 9 and is displaced counterclockwise to some extent, but along with this displacement, the shaft 5 is also displaced and the cable wire 8 is gradually pulled. As the lever 1 continues to be pulled up further, the tensile force of the wire 8 gradually increases, so the rotational displacement of the guide plate 2 is gradually restricted, and the compression spring 9 moves between the receiving part 1d which is being displaced and the tip of the guide plate 2. The shaft 5, which is compressed between the guide plate 2b and the guide plate 2b, and at the same time connects the front end 8a of the wire 8, begins to slide upward in the guide elongated hole 2a, which is displaced with the rotational displacement of the guide plate 2. Along with this, the rear end 4b of the link 4 connected to the shaft 5 also begins to move upward, and the link 4
rotates clockwise around shaft 6.

During this time, the braking action of the braking unit 7 to which the wire 8 is connected has not yet begun, so the resistance is small and the lever 1 can be pulled up quickly.

Furthermore, as the lever 1 is pulled up, the shaft 5 is displaced counterclockwise as shown in FIG.・Guide plate 2
Coupled with the displacement of the guide slot 2a, the shaft 5 slides along the guide slot 2a, and accordingly, the rear end 4b of the link 4 and the front end 8a of the wire 8 rotate counterclockwise and move upward. After the displacement, the tensile force is increased and becomes maximum at a position approaching or reaching the upper end of the guide elongated hole 2a, and the tensile force is transmitted to the braking section 7 to brake the wheels. The ratio of the distance L from the axis O, which is the rotation center of the lever 1, to the grip 1e of the lever 1 and the distance M from the rotation center O to the shaft 5 connecting the rear end 4b is determined from the beginning of non-braking to the time of braking. As the sliding displacement of the shaft 5 increases, for example, as shown in the figure, it changes from 1...1/2 to 1...1/4.

Next, if you want to release the brake, move the lever 1 in the opposite direction as above.
When the holder is pulled down using the axis O as a fulcrum and begins to rotate clockwise, the leg portion 1c, the receiving portion 1d, the compression spring 9, the guide plate 2, and the guide slot 2a gradually rotate as described above around the shaft 3. On the other hand, since the shaft 5 is rotated clockwise, the shaft 5 begins to move backward while moving downward along the guide slot 2a. Along with this, the front end 8a of the wire 8 also begins to move rearward, and the tensile force gradually decreases, and the resistance against the wheel due to the braking action of the brake part 7 weakens. The tensile force of 8 is weakened and the braking action is released.

Effects of the invention As described above, as the lever is pulled up when applying the brake, the compression spring is compressed as the tensile force of the wire increases, and according to the compression ratio, the lever side of the wire that operates the brake part is As the connection point moves, the ratio of the distance from the pivoting fulcrum of the lever to the arm side where the pulling force acts and the distance to the wire connection point gradually increases. The load required to cause this is reduced compared to conventional systems, and the operating force required by the driver when braking is significantly reduced. Furthermore, during the operation from the start of braking to just before braking, the displacement speed of the front end of the wire can be operated quickly compared to the conventional method in inverse proportion to the ratio of distance L and distance M, and the operation time can be shortened. There is.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the relationship between the present invention and the brake section before the start of the braking operation, and FIG. 2 is a side view of the main parts of the present invention in a state where the brake is applied and the lever is raised. Code; 1... lever, 1a... curved part, 1b...
...Arm part, 1c...Leg part, 1d...Receiving part, 1e...
Grip, 2... Guide plate, 2a... Guide slot,
2b...Tip, 3...Shaft, 4...Link, 4a
...Front end, 4b... Rear end, 5... Axis, 6... Axis,
7...Brake part, 7a...Link, 7b wire,
7c...cam, 7d...brake shoe, 8...
Cable wire, 8a...front end, 8b...rear end, 9...compression spring, O...axis center, D...brake drum, L...distance, M...distance.

Claims (1)

[Scope of utility model registration request] One end of the guide plate 2, which has a guide slot 2a drilled coaxially with or near the axis O of the rotation operation of the lever 1 in which the arm part 1b and the leg part 1c are connected in an L-shape, is rotated. The rear end 4b of the link 4 is slidably supported in the guide elongated hole 2a, and the front end 4a of the link 4 is rotatably supported on the arm of the lever 1. A cable wire 8 for operating the brake part 7 of the wheel is connected to the end 4b,
A receiving part 1 protruding from the tip of the leg part 1c of the lever 1
d and the tip 2b of the guide plate 2, a compression spring 9 is interposed.