JPS6374708A - Hydraulic suspension - Google Patents

Abstract

PURPOSE:To reduce the rolling angle of body under cornering, by providing a pump being driven through a power cylinder in a conduit communicating between right and left suspension, and transferring pressure oil between respective suspensions according to the steering direction. CONSTITUTION:Pressure oil fed from a hydraulic unit 6 through a pump 1 is stored in a gas encapsulated accumulator 10. When a controller 20 controls opening/closing of an oil supply valve 12 and an oil discharge valve 14 based on a signal fed from a ground clearance sensor 19, pressure oil is fed and discharged from right and left suspensions so as to control the ground clearance automatically. In such arrangement, a pump 21 is provided in a conduit 26 communicating between respective suspensions 7 and driven by a power cylinder of a power steering. When a steering wheel is rotated to the right, for example, pressure oil is fed from the right side to left side is respective suspensions 7. Consequently, maneuvering stability can be improved during cornering.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in hydraulic suspension systems for automobiles.

[Conventional technology]

The most important issue when manufacturing automobiles is safety. Among these, driving stability is an important technical issue for safety.

In other words, it is necessary to create a vehicle with higher running stability.

A hydraulic suspension device is a device for maintaining running stability.

A conventional hydraulic suspension device was constructed as shown in FIG. In the figure, pump 1. Motor 2. Filter 3. A hydraulic unit 6 consisting of a reservoir 4 and a relief valve 5 is provided, and the pressure oil generated by the hydraulic unit 6 is stored in a gas-filled accumulator 10 via a check valve 9. The motor 2 that drives the pump 1 repeats starting and stopping in response to a signal from a pressure switch 11 attached to the gas-filled accumulator 10 to maintain the oil pressure in the gas-filled accumulator 10 at an appropriate pressure. When raising the vehicle height, oil supply valve (electromagnetic valve) 12 is opened to supply pressure oil to the suspension, and when lowering the vehicle height, oil drain valve (electromagnetic valve) 14 is opened. This is done by returning the pressure oil to the reservoir 4.

Further, the spring force of the suspension body 7 is generated by a gas-filled accumulator 15. The damping force of the suspension body 7 is generated by a damping force generating device consisting of the throttle valve 1B and the check valve 17 in one day. The check valve 17 here is provided to change the damping force on the extension side and the contraction side of the suspension body 7.

In the figure, 19 is a vehicle height sensor that detects the vehicle height relative to the axle, and 20 is a valve opening/closing operation of the fuel supply valve 12 and oil drain valve 14 based on the output signal of the vehicle height sensor 19. It is a controller that controls the

[Problem that the invention seeks to solve]

With the above-mentioned conventional hydraulic suspension system, there is no problem during normal driving, but when the steering wheel is operated suddenly or when driving at high speed, the inertial force causes There is a problem in that the piston rod (suspension body) on the outside of the front wheels shrinks, causing a roll phenomenon in which the vehicle sinks to the outside of the curve, which may lead to a lack of steering stability.

The present invention aims to provide a hydraulic suspension device that further improves the above-mentioned steering stability.

[Means to solve the problem]

In order to solve the above problem, the present invention provides a pump driven by a power cylinder of a power steering in the middle of a conduit connecting left and right suspension bodies.

When the steering wheel is turned to the right, pressure oil is supplied from the right suspension body to the left suspension body, and when the steering wheel is turned to the left, pressure oil is supplied from the left suspension body to the right suspension body. This is what I did.

[Effect]

With the above configuration, the pump is driven by the operation of the handle, supplies pressure oil to the suspension body on the side that sinks due to rolling, and lifts the car body, while extracting pressure oil from the suspension body on the opposite side. to lower the vehicle.

This reduces the tendency of the vehicle to lean around curves, resulting in stable driving.

〔Example〕

An embodiment of the present invention will be described in detail below. In FIG. 1, a hydraulic unit 6 includes a pump 1. Motor 2. Filter 3. Composed of a reservoir 4 and a relief valve 5, pressurized oil pressurized by the pump 1 is stored in a gas-filled accumulator 10. Then, the pressure is detected by the pressure switch 11 and the motor 2 is driven so that the hydraulic pressure in the gas-filled accumulator 10 is constant. 9 is a check valve.

12 is an oil supply valve, 14 is an oil drain valve, and the controller 20
By opening and closing these valves, pressure oil is supplied to the suspension body 7 or pressure oil is discharged from the suspension body, thereby automatically controlling the vehicle height. 19 is a vehicle height sensor.

The spring force of the suspension body 7 is generated by a gas-filled accumulator 15. Further, the damping force of the suspension body 7 is generated by a damping force generating device consisting of a throttle valve 16 and a check valve 17. The check valve 17 is provided to change the damping force on the extension side and the contraction side of the suspension body 7.

A pump 21 is provided in the middle of a conduit 28 connecting the left and right suspension bodies 7. This pump 21
As shown in the figure, the power cylinder 24 of the power steering
It is mounted so as to be driven by a rack 25 provided in the. When the steering wheel is turned to the right, the suspension body 7 on the right side goes to the suspension body 7 on the left side.

Furthermore, when the steering wheel is turned to the left, pressure oil flows from the suspension body 7 on the left side to the suspension body 7 on the right side. Lines 27 and 28 are connected to pump 21
By opening the oil supply valve 12, the pressurized oil in the gas-filled accumulator 10 is supplied from both sides of the pump 21 to the left and right suspension bodies 7,
It is designed to raise the vehicle height.

The pipes 29 and 30 also branch off from the pipe 26 with the pump 21 in between, and by opening the oil drain valve 14, pressure oil is discharged from the left and right suspension engine bodies 7, lowering the vehicle height. ing. 22 and 23 are check valves.

The operation of this embodiment configured as above will be explained next. The vehicle height of the automobile is automatically adjusted by opening and closing the oil supply valve 12 and the oil drain valve 14 so that the height of the vehicle body relative to the axle is always constant, and the amount of pressurized oil (hydraulic pressure) in the suspension body 7 is adjusted. . This maintains running stability with respect to vehicle height. And gas-filled accumulator 15
The spring force generated by the vehicle and the damping force generator 18 provide a cushioning effect to improve riding comfort.

Next, when the steering wheel is turned and the car curves, a rolling phenomenon occurs, causing the outside of the curve, especially the front wheels, to sink and the car body to lean (this angle of inclination is called the roll angle).

In this case, the pumps 21 are simultaneously driven by a single motion of the whole wheel, and the pressure oil flows from the suspension body 7 on the inside of the curve to the suspension body 7 on the outside of the curve.

This allows the suspension body 7 to be on the outside of the curve.
acts in the direction of extension to lift the vehicle body, and conversely, the hydraulic pressure within the suspension body 7 on the inside of the curve decreases and acts in the direction of contraction, acting in the direction of lowering the vehicle body.

In this way, the pump 21 is activated at the same time as the steering wheel is turned, and the oil pressure in the left and right suspension bodies 7 is automatically adjusted so that the roll angle is reduced.

Incidentally, for a car equipped with a suspension mechanism in which the wheel pressure of the front wheels is 1400 mm, the roll angle during steady circular turning is 5'', and the cross-sectional area of the rod of the suspension body 7 is 10 crri', the discharge amount when the steering wheel is rotated once is is 20 am
'As a result of an experiment using a certain gear pump, the roll angle was 5 degrees to 4 degrees when turning the handle half a turn in a steady circle.
The running stability was good.

In the above explanation, the rack 25 provided on the power cylinder 24 is used to drive the pump 21 simultaneously with the rotation of the handle. However, this pump drive is based on the relationship between the rotation speed of the handle and the speed of the vehicle body. It is also possible to control the discharge amount of the pump in accordance with the derived roll angle. Further, the pump 21 may be a gear pump or any pump that can be driven by the power cylinder 24.

〔Effect of the invention〕

As detailed above, according to the hydraulic suspension device according to the present invention, a pump driven by a power cylinder is provided in the middle of the pipe connecting the left and right suspension bodies, and when the steering wheel is turned to the right, the pump from the right suspension body to the left side When the steering wheel is turned to the left, pressurized oil is supplied from the left suspension body to the right suspension body, so the system automatically reduces the roll angle of the vehicle when making curves. The oil pressure (oil amount) inside the left and right suspension bodies is adjusted,
It was possible to improve the stability of driving when making curves.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention, with FIG. 1 being a hydraulic circuit diagram and FIG. 2 being a front view showing the relationship between the power cylinder and the pump. FIG. 3 is a hydraulic circuit diagram of a conventional hydraulic suspension device. 7...Suspension body, 21...Pump. 2B...'[Road, 24...Power cylinder.

Claims (1)

[Claims] A pump driven by the power cylinder of the power steering is installed in the middle of the conduit connecting the left and right suspension bodies, and when the steering wheel is turned to the right, pressure oil is supplied from the right suspension body to the left suspension body, and when the steering wheel is turned to the left. A hydraulic suspension device characterized by supplying pressure oil from the left suspension body to the right suspension body when the suspension body is turned on.