JPS593000Y2 - Load-responsive brake device for vehicles - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a load-responsive braking device for a vehicle.

Conventionally, as shown in FIG. 1, in a vehicle brake system in which a front wheel brake 1 and a rear wheel brake 2 are operated by a tandem master cylinder 3, a load responsive control valve 4 is installed in the rear wheel brake hydraulic circuit. As the carrying load becomes smaller, the brake pressure on the rear wheel side is reduced to eliminate the rear wheel locking phenomenon and improve directional stability during braking.

However, since the conventional load-responsive brake device described above has a structure in which the axle casing and the load-responsive control valve are connected by a spong or the like, the vertical stroke of the axle casing becomes larger than the stroke of the load-responsive control valve, and the spring There were drawbacks such as the need for a large link mechanism and the need for a large link mechanism.

This invention was made to eliminate the above-mentioned conventional drawbacks. By using a bell crank-shaped shackle plate that connects the leaf spring and the car body, the displacement of the axle with respect to the car body can be adjusted at any ratio. The present invention provides a new compact load-responsive brake device that is devised so that the load can be transmitted to a response valve.

Hereinafter, embodiments of this invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, 5 is a frame of the vehicle on which the live load acts, 6 is a leaf spring fixed to the axle casing 7 by an inverted V-shaped fastener 8, and one of the leaf springs 6 is The annular end 6a is connected to a bracket 9 projecting from the frame 5 with a pin 10, and the other annular end 6b is connected to a shackle plate 13 pivotally connected to a bracket 12 projecting from the frame 5 with a pin 15.
This is a known configuration in which the pin 14 is used to connect the two.

Specifically, the shackle plate 13 is composed of a bell crank-shaped first plate 13a having one arm 16a and the other arm 16b as shown in FIG. 3, and a rectangular second play H3b. Both arms 16 of the first plate 13a
The intersection of a and 16b and the upper part of the second play) 13b are pivotally connected with a pin 15, and the end part of the one arm 16a of the first play 1-13a and the lower part of the second play) 13b are connected. Holding the annular end 6b of the leaf spring 6,
The configuration is such that they are connected by pins 14.

On the other hand, a load-responsive control valve 17 is installed on the frame 5 near the shackle plate 13, and a swing lever 19 is swingable so that a valve rod 18 that adjusts the opening/closing amount of the load-responsive valve 17 can be moved in and out. is pivotally connected with a pin 20, and an adjustment spring 21 is stretched between the swing lever 19 and the load-responsive valve 17, and the spring force of the adjustment spring 21 causes the swing lever 19 to swing counterclockwise. The load responsive valve 17 is controlled to operate in the opening direction.

The swing lever 19 and the other arm 16 of the first plate 13a
The above adjustment spring 2 is installed between the tip of b.
A main spring 22 having an outer diameter larger than 1 is tensioned, and the swing lever 19 is rotated by the adjustment spring 21.
The counterclockwise movement of the hour hand is restricted.

That is, the main spring 22 and the adjustment spring 2
The swing of the swing lever 19 is controlled by the spring balance with the swing lever 19.

If the load-responsive brake device is configured as described above, now
When the load is small, the leaf spring 6 takes on an arc shape as shown in FIG. As a result, the load responsive valve 17 is operated in the closing direction.

Next, when the load increases, the leaf spring 6 approaches a straight line, the shackle plate 13 swings counterclockwise, the spring force of the main spring 22 decreases, and the adjustment spring 21 The spring force causes the lift lever 19 to swing counterclockwise, and the load-responsive valve 17 is operated in the opening direction, thereby changing the hydraulic pressure turning point.

Regarding the above embodiment, the other arm 16 of the first play) 13a
FIG. 4 shows an embodiment in which the position of b is on the opposite side.

It is basically the same as the embodiment shown in FIG. As is clear from the above explanation, this idea is based on a load-responsive control valve in which one arm of a bellcrank-shaped plate (shackle plate) is pin-coupled to a leaf spring, and the other arm is connected to a load-responsive control valve attached to the vehicle body. Since this is a braking device, the amount of displacement of the axle relative to the vehicle body can be transmitted from the leaf spring to the load-responsive control valve at any ratio via the shackle plate, making the device more compact. .

In addition, the load-responsive control valve and the like can be mounted at a higher position, which is advantageous against flying stones.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a conventional load-responsive control device, Fig. 2 is a front view of the load-responsive control device according to this invention, Fig. 3 is an exploded perspective view of the shackle plate, and Fig. 4 is an illustration of the load-responsive control device. FIG. 7 is a front view of main parts showing a modification. 5...Frame, 6...Leaf spring, 13...Shackle play 1-113a
...First plate, 16a...One arm, 16b...Other arm, 17...Load responsive control valve, 19... Swing lever, 21...
... Adjustment spring, 22 ... Main spring.

Claims (1)

[Scope of utility model registration request] In a vehicle equipped with a leaf spring type suspension system that elastically supports the vehicle body and a load-responsive brake system that controls braking pressure according to the load, a shackle plate connecting one end of the leaf spring and the vehicle body is attached to a bell. It is composed of a crank-shaped plate, and the fulcrum of both arms of the plate is connected to the car body, and the tip of the other arm is connected to one end of a leaf spring with a pin, and the tip of the other arm of the plate is connected to the car body. A load-responsive brake system for a vehicle, characterized in that the two distribution valves are controlled by connecting the load-responsive control valve attached to the shackle plate and angularly displacing the shackle plate according to the loaded load.