JPH09240449A - Brake liquid pressure controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deformation or deterioration of a spring caused by vibration during traveling by providing a spring whose one end is attached to a part of a suspension mechanism and other end is attached to a control valve for reducing a brake hydraulic pressure and providing a protective case for covering the outer periphery of this spring. SOLUTION: An axle case 10 is attached to the rear end of a suspension arm having its front end attached to the lower part of a car body and one end of a stay 14 is attached to this axle case 10. On the other hand, a control valve 3 is attached to a bracket 12 fixed to the rear part of the car body and a lever 12 is attached to this control valve 3 via a shaft 13. Then, a spring 17 is hung between a spring attaching bolt 16 interpolated in the long hole 14a of the other end of the stay 14 and the lever 2 and this spring 17 is covered with a protective case 20 composed of a protective half part 18 and a sliding half part 19. Thus, when a load is placed in the load room of an automobile and if the rear part of the car body is lowered, the control valve 3 is controlled via the lever 2 and a brake hydraulic pressure is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braking fluid pressure control device for an automobile, and more particularly to a structure of a protection member for protecting a spring in the braking fluid pressure control device.

[0002]

2. Description of the Related Art Some types of automobiles are equipped with a braking fluid pressure control device as shown in FIG. This braking hydraulic pressure control device includes a control valve 3 mounted on a vehicle body 1 and provided with a lever 2 that rotates, an inlet pipe 4 connecting a brake master cylinder (not shown) and the control valve 3 to transmit braking hydraulic pressure, a control valve 3 and the drawing. Not connected to the rear brake cylinder, outlet pipe 5 for transmitting braking hydraulic pressure,
And a spring 7 having one end engaged with the leaf spring 6 of the rear suspension and the other end engaged with the lever 2.

When a heavy load is loaded in the luggage compartment of an automobile, the leaf spring 6 of the rear suspension flexes, so that the spring 7 contracts and the force exerted by the lever 2 on the control valve 3 becomes small. The control valve 3 adjusts so that the degree of pressure reduction of the hydraulic pressure transmitted from the inlet pipe 4 to the outlet pipe 5 is reduced in response to this change in force. Therefore,
When heavy luggage is loaded in the luggage compartment, the braking hydraulic pressure that acts on the rear brake cylinder increases, increasing the braking force on the rear wheels, and when the luggage in the luggage compartment is light, the braking oil pressure to the rear brake cylinder is reduced. It prevents the rear wheels from locking.

However, in the conventional braking hydraulic control system, the spring 7 is simply stretched between the leaf spring 6 and the lever 2, and therefore the diameter of the spring 7 is changed by the vibration generated by the unevenness of the road surface during traveling. It may shake greatly in the direction. Especially when the natural frequency of the spring 7 and the frequency of the rear suspension match,
Since the spring 7 vibrates violently in the radial direction, the spring 7 expands, and the initial load and the spring constant may change. Further, since the spring 7 is often made of a coiled thin spring material, the front wheel may be deformed when hit by a rock that is splashed by the front wheel.
Then, when the spring 7 is deformed, the elastic force acting on the control valve 3 changes, so that the adjustment of the braking hydraulic pressure depending on the weight of the luggage is deviated.

[0005]

According to the present invention, the spring is prevented from being deformed or deteriorated by providing the protective member so that the spring is not excessively deformed even by the vibration during traveling or the stones that are flipped up. A braking hydraulic pressure control device is provided.

[0006]

In order to achieve the above object, according to the present invention, a suspension mechanism in which a vehicle body is elastically supported so as to be vertically movable with respect to an axle case, and a braking fluid pressure can be reduced by being attached to the vehicle body. Control valve, a spring with one end attached to a part of the suspension mechanism and the other end attached to the control valve, and an extendable protective case that covers the outer circumference of the spring and is attached near both ends of the spring. The braking hydraulic pressure control device of

[0007]

FIG. 4 is a partial cross-sectional side view of an automobile to which the present invention is applied, and FIG. 4 (a) shows a lightly loaded state, that is, a state in which luggage is not loaded in a luggage compartment, Figure 4
(B) shows a state of constant loading, that is, a state in which a maximum allowable load of luggage is loaded in the luggage compartment. A front end of a suspension arm 8 is attached to a lower portion of the vehicle body 1 so as to be vertically rotatable, and a rear end of the suspension arm 8 is
An axle case 10 having a rear wheel 9 rotatably attached to the left and right ends thereof is attached.

A suspension spring 11 is mounted between the vehicle body 1 and the axle case 10, and the rear wheel 9 can move up and down along the unevenness of the road surface. In the embodiment, the suspension mechanism is formed by the suspension arm 8, the axle case 10 and the suspension spring 11. However, this suspension mechanism has any existing form as long as it elastically supports the vehicle body 1 on the axle case 10. A suspension mechanism may be used. Since the weight of the vehicle body 1 is supported by the suspension spring 11, when the luggage is loaded in the luggage compartment at the rear of the vehicle body, the suspension spring 11 bends and the suspension arm 8 moves as shown in FIG. 4B. It rotates and the rear part of the vehicle body 1 lowers.

FIG. 1 shows an embodiment of the present invention in which a control valve 3 capable of reducing the braking fluid pressure is attached to a bracket 12 welded and fixed to the rear portion of a vehicle body by a bolt (not shown). The control valve 3 is connected to an inlet pipe 4 that guides hydraulic pressure from the brake master cylinder and an outlet pipe 5 that guides hydraulic pressure to the brake cylinders of the rear wheels 9. Further, a lever 2 is rotatably attached to the control valve 3 via a shaft 13, and the control valve 3 has an inlet according to the magnitude of the force for rotating the lever 2 clockwise in FIG. The braking hydraulic pressure introduced from the pipe is appropriately reduced and guided to the outlet pipe 5.

One end of a stay 14 is attached to the axle case 10 by welding. Although the axle case 10 of the present embodiment includes the rotating axle 15 inside, the axle case 10 may have no rotating axle, such as the rear axle of a front-wheel drive vehicle. Further, the other end of the stay 14 is provided with an elongated hole 14a in the vertical direction. A spring mounting bolt 16 penetrates the elongated hole 14a and is fixed by a nut (not shown). The tightening position of the spring mounting bolt 16 can be adjusted up and down within the range of the elongated hole 14a.

The spring mounting bolt 16 and the lever 2
Between them, a spring 17 is stretched over in a slightly stretched state. The spring 17 is a coil spring, and is provided with a central twisted portion 17a, a straight portion 17b extending in the expansion and contraction direction of the twisted portion 17a, and a locking portion 17c formed in a small-diameter arc shape so as to be substantially symmetrical.

The outer periphery of the spring 17 is covered by a protective case 20 composed of a protective half portion 18 and a sliding half portion 19. FIG. 2 shows a spring 17 and a protective case 20.
2 (a) shows the spring 17 in the most contracted state, and FIG. 2 (b) shows the spring 17 in the most extended state. The protective half portion 18 has a cylindrical outer peripheral portion 18a that covers the outer periphery of the central twisted portion 17a of the spring 17, and a bottom portion 18b whose central portion is attached to the straight portion 17b of the spring 17 by caulking. Is doing. Also, the sliding half 19
Is a cylindrical outer peripheral portion 19a having a diameter substantially equal to that of the outer peripheral portion 18a of the protection half portion 18 and a bottom portion 19b obtained by caulking the central portion of the straight portion 17b of the spring 17 to cover the outer periphery of the central twisted portion 17a of the spring 17. And a bottomed tubular portion 19c, and a sliding tubular portion 19d formed integrally with the bottomed tubular portion 19c. And the sliding cylinder part 1
The inner diameter of 9d is slightly larger than the outer diameter of the outer peripheral portion 18a of the protection half portion 18, and the outer peripheral portion 18a and the sliding cylinder portion 19d are slidable. Therefore, since the protective half portion 18 and the sliding half portion 19 are slidable, the protective case 20 has an expandable structure. The length of the sliding tubular portion 19d is such that a gap is not formed between the outer peripheral portion 18a and the sliding tubular portion 19d or the outer peripheral portion 18a and the tubular outer peripheral portion 19a collide even when the axle case 10 is vertically moved. Has a length of.

Cushioning members 21, 21 made of an elastomer material are attached to the outer peripheral portion 18a of the protective half portion 18 and the outer peripheral portion 19a of the sliding half portion 19 by adhesion. As shown in FIG. 3, the cushioning material 21 has a plurality of ridges on its inner circumference, and can absorb impact when the spring 17 vibrates. The cushioning material may be a sheet-shaped elastomer material or a rubber coating without being restricted by the above-mentioned shape.

As described above, when luggage is loaded in the luggage compartment of the automobile, the rear portion of the vehicle body 1 is lowered while bending the suspension spring 11. Then, since the control valve 3 attached to the rear portion of the vehicle body moves downward, the stay 14
The spring 17 stretched between the lever 2 and the lever 2 is stretched. The control valve 3 has a spring 17 acting on the lever 2.
The braking hydraulic pressure from the inlet pipe 4 is appropriately reduced in accordance with the tension of the above, and is guided to the outlet pipe 5.

When the vehicle is traveling, vertical vibrations are generated in the vehicle body 1 and the axle case 10 due to the unevenness of the road surface, and the spring 17 tends to largely swing in the radial direction. In particular, when the direction connecting both ends of the spring 17 is close to a right angle with respect to the vertical movement direction of the axle case 10 as in the embodiment, the spring 17 tends to vibrate with a large amplitude due to its own weight and elasticity. However, in the present invention, since the outer periphery of the spring 17 is covered by the protective case 20, even if the spring 17 swings, the spring 17 does not hit the protective case 20 and vibrate with a large amplitude.

In the embodiment, the one support portion 17c of the spring 17 is locked to the stay 14 attached to the axle case 10, but the position where the spring 17 is locked is interlocked with the vertical movement of the suspension. Any place may be used as long as it is, for example, the suspension arm 8
A stay may be attached to the stay and the spring 17 may be locked to the stay.

[0017]

According to the present invention, since the outer circumference of the spring 17 is covered by the expandable and contractible protective cases 20 mounted near both ends of the spring 17, the spring 17 does not vibrate due to excessive amplitude. Therefore, it is possible to prevent the deterioration of the spring 17 due to vibration and the damage of the spring 17 by hitting other vehicle parts while the vehicle is traveling. Further, since the protective case 20 is expandable and contractible,
Since the outer periphery of the spring 17 is covered in accordance with the displacement of the spring 17, the pebbles or the like that the wheels have splashed up do not directly hit the spring 17. Furthermore, the protective case 20
Is attached near both ends of the spring 17, and almost no vibration occurs near both ends of the spring 17, so that the protective case itself does not shake greatly. Therefore,
Excessive force is not applied to both ends of the spring 17. In this embodiment, since the protective case member is formed of the protective half portion and the sliding cylinder portion, the spring 17 has a simple structure.
The outer periphery of the spring 17 can be covered, and the protective case 20 does not interfere with the expansion and contraction of the spring 17.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a braking hydraulic pressure control device to which the present invention is applied.

FIG. 2 is a cross-sectional view showing a stretched state of a spring.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a partial cross-sectional side view of an automobile to which the present invention is applied.

FIG. 5 is a diagram showing a conventional braking fluid thickness control device.

[Explanation of reference numerals] 1 vehicle body 3 control valve 17 spring 18 protective half 19 sliding half 20 protective case

Claims (2)

[Claims] 1. A suspension mechanism in which a vehicle body is elastically supported so that it can move up and down with respect to an axle case, a control valve attached to the vehicle body to reduce braking fluid pressure, and one end of which is attached to a part of the suspension mechanism. A braking fluid pressure control device comprising a spring having the other end attached to a control valve, and an expandable and contractable protective case attached to both ends of the spring while covering the outer periphery of the spring. 2. The protective case member comprises a bottomed cylindrical protection half part covering the outer circumference of the spring, a bottomed cylinder part having a diameter substantially the same as the protection half part, and a sliding cylinder slidable on the protection half part. The braking fluid pressure control device according to claim 1, wherein the braking fluid pressure control device is formed by a sliding half portion having a portion.