KR100244113B1 - Power steering system having pressure control structure of pressure valve - Google Patents

Abstract

The present invention relates to a power steering apparatus having a pressure regulating structure of a pressure valve, and in particular, to be operated together by the driving force of an engine, the oil supply means formed in a vehicle speed (rpm) sensitive type to generate a predetermined pressure in the oil when the vehicle is driven; And a predetermined amount of oil is delivered at a predetermined pressure generated by the oil supply means, and the pressure adjusting means and the pressure adjusting means are configured so that the amount and pressure of the oil are properly adjusted to the set oil amount and pressure even at a high speed. It is characterized in that the power steering means is configured to be operated to adjust the running direction so that the amount and pressure of the oil adjusted through it is passed straight and left / right.

According to the present invention as described above, a large amount of oil of high pressure transmitted from the power steering pump is automatically adjusted to the set pressure by the oil amount and pressure by the pressure control valve is delivered to the power steering gear steering is made safe steering at high speed driving It has the effect of increasing the safety and runability of the product and improving the reliability of the product.

Description

Power steering with pressure regulating structure

The present invention relates to a power steering apparatus having a pressure regulating structure of a pressure valve, and more particularly, a large amount of oil and a high pressure are automatically supplied through a pressure regulating valve during a high speed driving of a power steering pump linked with an engine. Since the pressure is adjusted to the set pressure and transmitted to the power steering gear, the present invention relates to a power steering apparatus having a pressure regulating structure of a pressure valve for safe handle operation at high speed.

In general, high-end passenger cars, heavy trucks and vehicles with heavy loads on the steering axle (eg FF-type cars) require a lot of maneuverability for wheel steering.

Therefore, when the steering gear ratio is increased, the operating force of the steering wheel (handle) can be reduced. In this case, however, the steering wheel must be rotated several times in order to steer from the stopper to the stopper.

Power steering is used to maintain low maneuverability while using normal steering gear ratios.

The power steering device varies slightly depending on the type, but is composed of a steering gear, a hydraulic pump, a hydraulic control device, one or two working pistons, and the like.

The actuating piston is also connected to the steering gear mechanism.

The hydraulic pressure required for the power steering device is generated by driving a separate hydraulic pump to the engine, which is connected to the hydraulic oil tank.

The control valve also supplies hydraulic pressure to the required side of the actuating piston, depending on the handle operating direction.

The supplied hydraulic pressure acts on the steering gear to reduce the operating force required for the rotational movement of the handle.

Depending on the size and type of vehicle, the capacity of the oil pump is about 5 to 8 liters per minute under normal load.

The required power varies greatly depending on the engine rotational speed and the oil pressure required for steering, but averages about 0.8 kW conduction and about 4 to 5 kW when curving or parking.

On the other hand, the mechanical steering gear is formed so that the driver can steer the vehicle even when the power steering system, that is, the hydraulic system, fails.

In the case of using such a large vehicle or low-pressure tires, the ground resistance of the front wheel increases, so that the steering force of the steering wheel increases, and there is a risk of not being able to perform quick steering operation.

In this case, the power steering system is used to meet the demand of light and quick steering operation. The power steering system is installed in the middle of the power steering system to reduce the operating force of the steering wheel by its powering action. It is operated by using the hydraulic pressure generated by driving.

First, the power steering apparatus can select a steering gear freely because the operation force can be reduced, and second, to prevent kick back of the steering wheel due to the impact on the road surface, and third, to reduce the shimmy motion of the front wheel. It is effective.

The power steering device controls the weight of the steering wheel according to the speed of the vehicle, so that the steering feeling of light weight is obtained at low speed and moderate weight at medium and high speed.

One way of responding to speed is to detect the vehicle speed by the vehicle speed sensor and change the operating pressure of the power piston in response to this.When the vehicle speed is low, the operating pressure is normalized so that the operating pressure is lowered. do. In addition, the vehicle speed is electrically detected and sent to a computer to change the working pressure of the power cylinder by a signal from the computer.

The operating pressure is controlled by installing a solenoid valve in the bypass circuit connecting the two chambers of the power cylinder. When the solenoid valve is opened, the high pressure side where the working pressure is applied is reduced through the low pressure side connected to the drain, thereby reducing the back-up action. Steering force is increased.

The solenoid valve is opened according to the vehicle speed by a signal from the computer, and the steering force is moderately weighted at medium and high speeds at low speeds.

In addition, the vehicle speed sensor uses a trocoid type hydraulic motor to control the amount of oil passing through the vehicle speed, and to change the movement of the control valve for converting the flow path to obtain an appropriate steering feeling.

Rollers are provided at both ends of the control valve, and the recoil plunger is pushed thereto. The recoil plunger pushes the rollers under the spring force of the inner spring and the hydraulic force applied to the reaction chamber. For this reason, the movement of the control valve is mainly changed by the hydraulic pressure applied to the reaction chamber, so that when the hydraulic pressure corresponds to the vehicle speed, an appropriate steering feeling is obtained.

The hydraulic motor acting as a vehicle speed sensor is installed in the flow path in parallel with the power cylinder, and the cut voff valve is used to control the hydraulic pressure in the reaction chamber.

In engine start and stop operation, since the oil pressure from the oil pump is applied to the lower part of the cutoff valve, the cutoff valve is pushed up and the flow path to the reaction chamber and the vehicle speed sensor is closed. This results in the least amount of force the recoil plunger pushes on the control valve, and the control valve can change the flow path without limiting movement (the handle is light).

When driving, the hydraulic motor in the vehicle speed sensor rotates and starts to flow oil into the tank, so it is applied to the lower part of the cutoff valve so that the hydraulic pressure decreases and the cutoff valve is lowered.

This passes through the flow path from the oil pump to the reaction chamber and vehicle speed sensor and applies hydraulic pressure to the reaction chamber to limit the movement of the control valve.

In addition, the one-wear valve in the vehicle speed sensor serves to return oil from the vehicle speed sensor outlet to the inlet so that oil pressure at the inlet of the vehicle speed sensor does not decrease when the amount of passage of oil increases at high speed.

However, these conventional power steering devices are linked together by the driving force generated from the engine, and the steering wheel during high-speed driving because a large amount of oil and high pressure are directly transmitted to the power steering gear at high speed by a power steering pump made of a vehicle speed (rpm) sensitive type. This lighter steering was not safe, and there was a problem in that the steering safety and runability of high-speed driving were deteriorated, and the merchandise and reliability of the product were deteriorated.

Therefore, the present invention has been made to solve the fundamental problems of the prior art, the purpose of which is the power steering pump interlocked with the engine is a large amount of oil and high pressure automatically at high speed during the high speed running through the pressure control valve It is to provide a power steering device having a pressure control structure of the pressure valve that can be adjusted to the set pressure and transmitted to the power steering gear to ensure a safe steering operation at high speed driving to improve steering safety and runability.

1 is a control flowchart of a power steering apparatus according to the present invention;

2 is a schematic cross-sectional view of a state in which a pressure valve is operated at a low pressure of the power steering apparatus of the present invention;

3 is a schematic cross-sectional view of a state in which a pressure valve is operated at a high pressure of the power steering apparatus of the present invention.

<Explanation of symbols for main parts of drawing>

10: power steering pump 20: pressure regulating valve

21 housing 21a variable space

21b: oil inlet furnace 21c: oil inlet furnace

22: variable variable part 22a: pressure oil receiving hole

22b: variable plate 22c: support plate

22d: elastic body 23: pressure regulator

23a: connecting passage 23b: first valve

23c: stopper 23d: contact plate

23e: 2nd valve 23f: spring

30: power steering gear

In order to achieve the above object, the present invention is to be operated together by the driving force of the engine is oil supply means formed in the vehicle speed (rpm) sensitive type to generate a predetermined pressure in the oil when driving the vehicle, and generated in the power steering pump A certain amount of oil is delivered at a predetermined pressure, the pressure adjusting means is formed so that the amount and pressure of the oil is properly adjusted to the set amount and pressure even at high speed, and the amount and pressure of the oil adjusted through the pressure adjusting means It provides a power steering apparatus having a pressure regulating structure of the pressure valve, characterized in that the power steering means is configured to be transmitted so that the driving direction is adjusted to turn straight and left / right.

In the present invention as described above, a large amount of oil of high pressure transmitted from the power steering pump is automatically adjusted to the set pressure by the oil amount and pressure by the pressure control valve to be delivered to the power steering gear steering is made safe steering at high speed driving The safety and runability of the product can be increased and the reliability of the product can be improved.

Hereinafter, a preferred embodiment of the present invention as described above with reference to the accompanying drawings in more detail as follows.

1 is a control flow chart of a power steering apparatus according to a preferred embodiment of the present invention, Figure 2 is a schematic cross-sectional view of a pressure valve is operated at a low pressure of the power steering apparatus of the present invention, Figure 3 is a present invention Fig. 1 shows a schematic cross-sectional view of the state in which the pressure valve is operated at the high pressure of the power steering system.

As can be seen from the above, the present invention is operated by the driving force of the engine is made of a power steering pump (10) and the power steering pump is formed in a vehicle speed (rpm) sensitive type to generate a predetermined pressure in the oil when driving the vehicle, A certain amount of oil is delivered to the predetermined pressure generated in (10), and thus the pressure adjusting valve 20 and the pressure adjusting valve 20 are formed so that the amount and pressure of the oil are appropriately adjusted to the set oil amount and pressure even at a high speed. In the configuration of the power steering gear 30 is configured to be operated to adjust the running direction so that the amount and pressure of the oil adjusted through the (20) is transferred to the straight and left / right, the pressure regulating valve 20 is An oil inflow passage 21b is formed on both sides of the variable space 21a on the inner upper side, and the lower portion is stepped, respectively, and the housing 21 has an oil outlet passage 21c formed at the center thereof. A variable plate 22b having multiple pressures bent to be accommodated in the variable space 21a of the housing 21 and having a pressure oil receiving hole 22a is formed, and the support plate 22c positioned at a predetermined distance from the variable plate 22b. Is formed and is positioned between the variable plate 22b and the support plate 22c to form the elastic member 22d to elastically support the variable plate 22b, and a connection passage 23a penetrating through the center thereof. ) Is formed with a first valve (23b), the stopper (23c) is provided at the top and the contact plate (23d) at the bottom is interconnected to form a first valve (23e) is fitted into the connecting passage (23a) And a pressure regulator 23 having a spring 23f positioned therebetween such that the first and second valves 23b and 23e are mutually supported.

Power steering device having a pressure control structure of the pressure valve of the present invention having the configuration as described above is operated as follows.

When the power steering device operates at a low speed, a certain amount of oil is moved along the oil inlet passage 21b of the pressure regulating valve 20 through the power steering pump 10, so that the power steering gear is driven through the oil outlet passage 21c without any resistance. 30 is supplied to the steering wheel.

In addition, during high speed driving, when the rpm is increased, a large amount of oil and a high pressure oil are moved through the power steering pump 10 which is interlocked with the engine, and flows along the oil inlet path 21b of the pressure regulating valve 20. The first valve 23b of the regulator 23 flows into the pressure oil receiving hole 22a of the variable space 21a in the housing 21, and when the amount of oil exceeding a predetermined pressure and accommodation flows into the first valve 23b. The second valve 23e, which is fitted into the connection passage 23a of the second valve 23e and is closed, is opened and discharged along the oil outflow path 21c. At this time, the oil of high pressure is subjected to strong resistance by the first and second valves 23b and 23e, and the oil pressure and outflow amount are automatically adjusted.

The oil whose pressure and amount are adjusted is supplied to the power steering gear 30 so that the steering wheel can be safely operated without change during low and high speed driving, thereby increasing driving and safety.

According to the present invention as described above, a large amount of oil of high pressure transmitted from the power steering pump is automatically adjusted to the set pressure by the oil amount and pressure by the pressure control valve is transmitted to the power steering gear steering is made safe steering at high speed driving It has the effect of increasing the safety and runability of the product and improving the reliability of the product.

Although the present invention has been shown and described with reference to certain preferred embodiments, the present invention is not limited to the above-described embodiments and has ordinary skill in the art to which the present invention pertains without departing from the spirit of the present invention. Various changes and modifications may be made by the user.

Claims (1)

The oil supply means is formed in a vehicle speed (rpm) sensitive type in which a predetermined pressure is generated in the oil by the driving force of the engine, and a predetermined amount of oil is delivered at a predetermined pressure generated by the oil supply means, so Pressure regulator of the pressure valve composed of a pressure regulating means formed to be adjusted to the pressure, and the power steering means for adjusting the running direction by being passed straight and left / right by transmitting the amount and pressure of the oil adjusted through the pressure adjusting means The pressure regulating valve may include a housing in which an oil inflow passage is formed on each side of the pressure adjusting valve and a lower portion of the pressure adjusting valve forms a predetermined variable space at an inner upper portion thereof. A variable plate having multiple pressure bend holes is formed to be accommodated in the variable space, and a variable plate having a pressure oil receiving hole is formed and spaced apart from the variable plate at a predetermined interval. The support plate is formed in the portion is formed between the variable plate and the support plate is a variable variable portion formed with an elastic body so that the variable plate is elastically supported, a first valve formed with a connection passage through the center is formed and the stopper is provided at the top and the bottom The pressure valve of the pressure valve, characterized in that the close contact plate is connected to each other to form a second valve coupled to the connecting passage is formed between the spring is positioned between the first and second valves are mutually hardened Power steering with adjustable structure.

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