JPS61220976A - Braking device for vehicles - Google Patents

Abstract

PURPOSE:To aim at simplification in a device structure, by installing a symmetrical pair of brake levers in vehicles including a tractor and the like controlled by radio, while selecting a directional control valve during engine running, and constituting it to energize these brake levers in a releasing direction by a cylinder-cum-spring. CONSTITUTION:When an engine starts, a hydraulic fluid is boosted in its pressure, turning on a pressure switch 12, whereby a first directional control valve 5 is selected to the side of an operating position 10. Therefore, this hydraulic fluid is fed to spring-pressure cylinders 2A and 2B by way of second directional control valves 6A and 6B usually situated in the illustrated position and pushed out a piston against a spring 3 whereby brake levers 1A and 1B is displaced to the brake release side. Next, when the engine is stopped, a hydraulic pump 7 comes to a stop, and the pressure switch is restored to its original state so that the first directional control valve 5 is selected to the side of a normal position 9, and the hydraulic fluid inside these cylinders 2A and 2B is discharged to an oil tank 8, thus both these brake levers 1A and 1B are displaced to the brake operating side.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vehicle braking system, particularly for use in radio-controlled vehicles.

Conventional technology When controlling a vehicle such as a tractor by radio, and the brakes are mechanical, conventionally, dedicated signals are used for operating the parking brake or applying the brakes on the right and left sides independently. It was necessary to prepare.

Problems to be Solved by the Invention For this reason, in the past, it was necessary to prepare dedicated channels for each, or the groove structure of the brake device became complicated, causing problems in the hardware configuration.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to make it possible to operate the parking brake and the left and right brakes using a minimum number of channels and a simple device configuration.

Means for Solving the Problems In order to achieve the above object, the present invention includes a pair of brake levers for independently applying brakes on the right and left sides of a vehicle, and a pair of brake levers that are linked to each brake lever and are connected to the brake application side. A pair of spring-loaded cylinders are energized, and a signal indicating that the vehicle engine is running supplies hydraulic oil from a hydraulic pump into the cylinders from a normal position where the hydraulic oil in the cylinders can be discharged. a spring-loaded first switching valve that is switched to a possible operating position; connected in series with the first switching valve and the cylinder;
A second valve that supplies hydraulic oil to the left and right cylinders individually.
The configuration includes a switching valve and a switching valve.

With this type of operation, when the engine is operated, the first switching valve is switched to the operating position, hydraulic oil is supplied into the cylinder, and this cylinder moves the brake lever against the force of the spring. This results in displacement toward the brake release side. Also, when the engine stops, the first switching valve returns to the normal position due to the action of the spring, and the hydraulic oil in the cylinder is discharged by the force of the spring of this cylinder, so this cylinder moves the brake lever to the brake application side. It will be energized. This allows the brake to be released and activated in conjunction with engine operation and stop, allowing it to be used as an automatic parking brake.

Also, while the engine is running, hydraulic oil is supplied into the cylinder by the switching valve @1 as described above, but the hydraulic oil in any left or right cylinder is discharged by operating the second switching valve. This allows the left and right brakes to act independently.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. In Figure 1, (IA) is the right brake lever of the vehicle;
(IB) is its left brake lever.

(2A) (2B) are brake levers (IA) (IB)
This is a spring-loaded cylinder for individually driving the brake levers (IA) (I
B) is always biased towards the brake activation side.

(4) is a hydraulic oil line to the cylinders (2A) (2B), which includes a first switching valve (5) and a pair of second switching valves (5) installed corresponding to the cylinders (2A) (2B). 6A) (6B
). (7) is a hydraulic pump driven by the engine of the vehicle, and is connected to the first switching valve (5). (8) is an oil tank.

The first switching valve (5) is composed of a spring-loaded electromagnetic switching valve, and is in a normal position that connects the hydraulic oil line (4) to the oil tank (8). ! (9) and an operating position Q that connects the hydraulic oil line (4) to the hydraulic pump (7). (El) is a spring. (6) is a pressure switch, which operates the vehicle's engine to operate the hydraulic pump (
It operates when pressure is generated in the first switching valve (5).
) is actuated to operate the solenoid (to) of this first switching valve (
5) can be switched to operation/position αQ.

The second switching valves (6A) (6B) are also configured with spring-equipped electromagnetic switching valves, and have a normal position 04 where hydraulic oil from the hydraulic pump (7) can be supplied to the cylinders (2A) (2B). , and an operating position (to) in which the hydraulic oil in the cylinders (2A) and (2B) is discharged to the oil tank (8). 01 is a spring. These second switching valves (6A) (6B) are configured such that solenoids (to) are operated by radio signals (17A) (17B), and the radio control device requires two channels for this purpose.

If the vehicle is a tractor, the pump for the work equipment can also be used as the hydraulic pump (7), and if the vehicle runs on a hydraulic motor, the pump for driving the hydraulic motor can be used as the hydraulic pump (7). ) can also be used.

In such a configuration, when the engine operates, the pressure of the hydraulic oil is increased by the hydraulic pump (7), and the pressure switch (
) operates, the first switching valve (5) is operated by the spring (b).
is switched to the operating position DI side against the This results in
Hydraulic oil from the hydraulic pump (7) is passed to the hydraulic oil line (4). Usually, the second switching valve (6A) (6B) is
Since it is biased toward the normal position a4 by the action of the spring αQ, the hydraulic oil from the hydraulic pump (7) through the hydraulic oil line (4) is supplied into the cylinders (2A) (2B).
The cylinders (2A) (2B) are extended against the force of the spring (3).

As a result, the brake levers (IA) (IB) are displaced to the brake release side, and the vehicle can travel freely.

While the vehicle is running, if you want to apply the brakes on the right side, for example, operate the solenoid (to) using the radio signal (17A) and switch the second switching valve (6A) to the spring Q.
Switch to the operating position (to) against l. Then, the hydraulic oil in the cylinder (2A) is discharged into the oil tank (8) by the action of the spring (3), the cylinder (2A) is retracted, and the brake lever (IA) is displaced toward the brake key or the moving side.

This applies the brakes only to the right side of the vehicle.

If you want to apply the brakes to the left side of the vehicle, you can operate in the same way as above, and if necessary, you can also apply the brakes to both the left and right sides.

When the vehicle engine is stopped, the hydraulic pump (7) is stopped and the pressure switch υ returns to its original state, so the first switching valve (5) returns to the normal position (9) due to the action of the spring 0η.
Switched to the side. As a result, the second switching valve (6A) (
6B) is switched to the normal position ttQJ side, the hydraulic oil in the cylinders (2A) (2B) is switched to the switching valve @l (5
) and is discharged to the oil tank (8), both the left and right brake levers (IAHIB) are displaced to the brake activation side, and the parking brake is applied.

FIG. 2 shows another embodiment of the invention.

In this example, the cylinders (2A) and (2B) are of a double acting type, and have a first cylinder chamber (2) on the spring (3) side and a cylinder chamber (2) on the opposite side @2. are doing.

The switching valves (5A) (5B) in Book 1 are connected to each cylinder (2A) (
2B), and a pilot type type is used. In the normal position (9), this first switching valve (5A) (5B) allows both cylinder chambers @ (2) to communicate with each other, and also allows the hydraulic pump (7) and oil tank (8) to communicate with each other.
). Also, the operating position α
At Q, the hydraulic pump (7) and the second cylinder chamber (2
), and the first cylinder chamber (2) and the oil tank (8) are communicated with each other.

(6) is a second switching valve, which is a spring center type electromagnetic 8-position switching valve. (16A) (16B
) are springs, (1 & A) (18B) are wireless signals (
17A) (17B) is the solenoid operated.

) is in the neutral position, and by supplying hydraulic oil from the hydraulic pump (7a) to the first switching valves (5A) (5B),
It is designed to act as pilot pressure. (to) is the first switching position, which allows hydraulic oil from the hydraulic pumps (7a), 7s, etc. to be supplied to the pilot of the first switching valve (5A), and also to the pilot of the gi switching valve (5J3). The hydraulic oil can be discharged into the oil tank (8a).

In addition, (c) is the second switching position, in which hydraulic oil from the hydraulic pump (7a) can be supplied to the first switching valve (5B), and pilot hydraulic oil for the first switching valve (5A) can be supplied. can be discharged into the oil tank (&1).

The same hydraulic pumps (7) (7a) and oil tanks (8) (8a) can be used in common, and the hydraulic pumps (7) (7a) can be used in the same way as in Figure 1. , the one for work iI and the one for running the vehicle can be used.

In this example, when the engine of the vehicle is operated with the second switching valve (6) in the neutral position, the hydraulic fluid from the hydraulic pump (7a) is applied to the pilot pressure of the switching valves (5A) and (5B) of the tgx. The first switching valve (5A) (5B)
is switched to operating position αQ. Then, both cylinders (
2A) (into the 2nd A cylinder chamber of 2B)) to the hydraulic pump (
The hydraulic oil from 7) is supplied, and the hydraulic oil in the first cylinder chamber (b) is discharged to the oil tank (8).

As a result, the cylinders (2A) (2B) are extended, the brake levers (IA) (IB) are displaced to the brake release side, and the vehicle can freely travel.

If you want to apply the brake to the right side of the vehicle, move the second switching valve (6) to the second switching position f! Switch to the 1 (to) side.

Then, the pilot pressure of the first switching valve (5A) is released and it switches to the normal position (9), and the cylinder (2A)
The hydraulic oil in the second cylinder chamber (2) is sent into the first cylinder chamber (2) by the action of the spring (3), and
A) is degenerate. As a result, the brake lever (]A) is displaced to the brake activation side, and the brake is applied only to the right side of the vehicle. If it is desired to apply the brake to the left side of the vehicle, the second switching valve (6) may be switched to the first switching position (good), and the same braking operation as described above is performed.

When the engine of the vehicle is stopped, the hydraulic pump (7a) is stopped, and no matter which switching position the switching valve (6) of the whistle 2 is in, the first switching valve (5A) (5B) maintains the pilot pressure. Since it is released and switched to the normal position (9), the cylinders (2A) (2B) retract and the brake lever (IA)
(IB) are both displaced to the brake application side, and the parking brake is applied.

Effects of the Invention As described above, according to the present invention, the parking brake can be automatically activated and released in response to the start and stop of the vehicle's engine. This makes it possible to eliminate the need for a separate channel. Further, since most of the hydraulic circuit for applying one-sided brake to the vehicle and the hydraulic circuit for the parking brake can be shared, the configuration can be simplified.

[Brief explanation of drawings]

FIG. 1 is a hydraulic circuit diagram of one embodiment of the present invention, and FIG. 2 is a hydraulic circuit diagram of another embodiment of the present invention.

Claims (1)

[Scope of Claims] 1. A pair of brake levers for independently applying brakes on the right and left sides of a vehicle, and a pair of spring-loaded cylinders that interlock with each brake lever and bias them toward the brake application side. , with a spring that can be switched from a normal position where the hydraulic oil in the cylinder can be discharged to an operating position where hydraulic oil can be supplied from the hydraulic pump into the cylinder in response to a signal indicating that the vehicle engine is running. a first switching valve connected in series to the first switching valve and the cylinder,
The second valve allows hydraulic oil to be supplied and discharged to the left and right cylinders individually.
A braking device for a vehicle, comprising: a switching valve; and a braking device for a vehicle.