KR0170615B1 - Power steering system - Google Patents

Abstract

The present invention relates to a steering apparatus used to change the direction of the vehicle, in particular, by applying an appropriate current to the solenoid by receiving an electrical signal such as the vehicle speed from the electronic control unit, providing proper hydraulic pressure to the reaction mechanism unit to go straight to the vehicle speed Simple structure of V groove plate and V groove base that generates reaction force in improving stability improves workability and productivity, and can be easily assembled by press-fitting with input shaft. The present invention relates to a vehicle steering apparatus that provides a hydraulic reaction apparatus that has a simplified position by raising a generation position to an upper portion of a valve body, thereby improving linear stability at high speed and generating steering assistance at low speed.

Description

Automotive steering

1 is a cross-sectional view and a system schematic configuration diagram of the present invention.

2 is a cross-sectional view taken along the line A-A of FIG. 1 of the present invention.

3 is a cross-sectional view taken along line B-B in FIG. 1 of the present invention.

* Explanation of symbols for main parts of the drawings

1: Pressure shaft 2: V groove base

3: valve body 4: pinion

5: valve housing 6: torsion bar

7: O-ring 8: pin

9 sealing 10 V groove plate

11: sealing 13: bush

14: bearing 15,18: oil seal

16,20: O-ring 17: Pin

19: solenoid valve 21: spool

25: fix bolt 26,27: spring

28: snap ring 100: electronic control unit

105: handle

The present invention relates to a steering apparatus used to change the direction of the vehicle, and in particular, by adjusting the steering force of the steering wheel during the straight and high speed driving of the car to give the driver a sense of driving stability and to generate steering assistance at low speed to improve steering power It relates to a vehicle steering device that can be made.

In general, the hydraulic control valve of the automobile is connected to the rack and the pinion and the in shaft to be integrally connected by the torsion bar, and the valve body is installed on the circumferential surface of the in shaft, but the hydraulic oil is supplied to the circumferential surface of the valve body by a power cylinder. There is a supply hole to make the torsion bar rotate, and the torsion bar is twisted because the forward resistance of the tire acts on the rack when the steering wheel is rotated.

Therefore, the hydraulic pressure supplied to the power cylinder by the groove of the valve body and the control edge of the input shaft pushes the piston of the rack to soften the steering force.

In the conventional hydraulic control valve for power steering used for this purpose, a torsion bar connecting the pinion, the input shaft and the pinion, and a control edge for determining the direction of the hydraulic oil block each port on the input shaft and the circumferential surface. It consists of a valve body with a sealing.

Therefore, the conventional hydraulic control valve configured as described above has a problem in that the pressure changes due to the stiffness of the torsion bar and the torsion occurs so that the driving stability cannot be maintained during high-speed driving while driving straight.

The present invention receives the electrical signal such as the vehicle speed from the electronic control device to compensate for the conventional problems as described above by applying an appropriate current to the solenoid, by applying the hydraulic reaction force to improve the straight stability to the vehicle speed, generating a reaction force V Simple structure of groove plate and V-groove base improves workability and productivity, and can be easily assembled by press-fitting with the input shaft to improve assembly and increase the reaction force to the upper part of valve body to simplify the shape. In order to improve the steering stability at high speeds and to generate steering assistance at low speeds, the steering power is improved. Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. .

In the configuration of the present invention, as shown in FIGS. 1, 2, and 3, an input shaft 1 and a stopper surface of the input shaft 1 having a return hole and a stop surface and a groove formed as a working chamber are formed. A V-groove plate (2) press-fitted into the V-groove plate (2) having several V-grooves, installed on an outer circumferential surface of the input shaft (1) to prevent the loss of hydraulic oil, and the entrance shaft (1) A snap ring 18 mounted on an outer circumferential surface to fix the valve body 3, a valve body 3 acting as a rotary valve in conjunction with the input shaft 1, and a plurality of upper surfaces of the valve body 3; Pin 8 is press-fitted into the hole, and the pin 8 is combined with the pin 8 to form a plurality of V-grooves on the upper surface and the hole fixed in the rotational direction and slid in the axial direction, and to prevent the leakage of hydraulic oil on the outer peripheral surface V-groove base 10 having grooves to which the sealing is installed, and the V-groove Spring 6 which always pushes the tooth 10, the sealing 11 is installed on the outer circumferential surface of the V groove base 10, and is installed between the V groove base 10 and the V groove plate (2) Several balls 12, several sealings 9 installed on the outer circumferential surface of the valve body 3 to prevent the loss of operating oil, gears for transmitting the rotational force of the handle to the rack shaft are formed inside the top The torsion bar 6 and the bush 13 are press-fitted, and the pinion 4 presses several pins 22 at the upper end, and the pinion 4 is press-fitted inside the upper end of the input shaft 1 and the input shaft A torsion bar 6 fixed with a pin at an upper end of the torsion rod, a Roy 16 installed on an outer circumferential surface of the torsion bar 6 to prevent an external loss of the hydraulic oil, and hydraulic oil from the pump to receive the hydraulic oil from the pump. Through port, which is the passageway of hydraulic oil, Is a valve housing (5), oil seals (15,18) press-fitted into the valve housing (5) to prevent the loss of operating oil, and a bearing (14) press-fitted into the valve housing to smooth the pinion valve assembly and rotation. ), A solenoid valve 19 having a certain amount of displacement and force in the axial direction by receiving an appropriate current according to the vehicle speed, an O-ring 20 for preventing a loss of hydraulic oil in the solenoid valve portion, and the solenoid valve Spool 21 having an axial displacement and having an orifice for depressurizing the hydraulic oil supplied from the inlet and having a flow path groove formed on the outer circumferential surface thereof and having a through hole therein, and always pushing the spool 21 at all times. The spring 17 in a fixed position, the fix bolt 25 for pushing the spring to be fixed at a predetermined position, and the vehicle speed input by the vehicle speed sensor are calculated to provide an appropriate current to the solenoid. Electronic control unit 100 is provided to provide a configuration.

Referring to the effects of the embodiment of the present invention configured as described above are as follows.

The hydraulic oil supplied from the pump flows into the valve housing 5 through the inport of the valve housing 5, and the valve body 3, which is a typical rotary valve structure, and several slots of the upper end of the input shaft 1 are connected to the torsion bar 6. Only the weak torsional torque of) causes mutual displacement to form the left and right cylinder flow paths to form steering assistance as the driver's steering will.

At this time, the electronic control unit 100 detects various signals such as the vehicle speed generated by driving of the vehicle and applies a certain amount of current to the solenoid valve 19 according to the signal, which is proportional to the amount of current. That is, it has a certain amount of force and displacement in the axial direction depending on the vehicle speed, and this force and displacement controls the flow cross-sectional area of the etch portion that serves as an orifice installed in the spool by controlling the displacement of the spool 21. The hydraulic oil passing through the cross-sectional area passes through the flow path of the valve housing 5 to act on the space (reaction chamber) 52 formed between the upper end of the valve body 3 and the V groove plate, which is changed according to the vehicle speed. It has a constant pressure and flow rate, so the V groove base 10

F1 = P x A

F1: Pushing force of V groove base.

A: Cross section of V groove base.

P: pressure of the working oil.

The V-groove plate, ball and V-groove base fixed to the input shaft 1 are pushed to push the V-groove base fixed in the rotational direction and axially slid by the pin of the upper end of the valve body (3). It is integrated with (3).

Therefore, when the steering wheel is turned to the left or the right as the driver's steering intention, the weak torsional torque of the torsion bar (6) and the strong force that generates displacement of the V groove plate, the ball and the V groove base are added to the valve body (3) and the neutral. The input shaft (1) in the state is twisted at an angle to the valve body (3) to form a flow path to the left and right cylinders to act as a typical rotary valve for supplying hydraulic fluid and according to the vehicle speed as follows Rotational torque will change.

Tt = Th x Tr / p

Tt: Total torque for turning the handle.

Th: Less torque to twist the torsion bar.

Tr / p: The tangential force of the reaction mechanism, which increases with speed.

In addition, at low speeds, the pressing force between the V-groove plate, the ball and the V-groove base is minimized, and the rotating torque Th generating the mutual displacement of the input side 1 and the valve body 3 causes the torsion bar 6 to be removed. Even though only a small amount of rotation torque (Th) causes the bit to displace each other, the hydraulic oil can be smoothly supplied to the left and right cylinders, but at high speed, the pressing force between the V groove plate, the ball and the V groove base is maximum. Rotational torque Tt, which generates mutual displacement of the input shaft 1 and the valve body 3, has a weak force Th that twists the torsion bar, and a strong force that generates the displacement of the V groove plate, the ball, and the V groove base. The rotation torque (Tt), which is the sum of the tangential forces (Tr / p) of F1, is required, so that the driver turns the steering wheel according to the change in the tangential force of F1, which changes according to the vehicle speed.

Therefore, the input side 1 instantaneously generates a mutual displacement with the valve body integrated with the pinion by the steering force of the handle 105.

In addition, the upper end of the input shaft is fixed to the upper end of the torsion bar 6 with a pin 17, the lower end of the torsion bar is fixed inside the upper end of the output shaft 4, and the lower end of the output shaft is connected to the rack bar (not shown). At the end, the tire is connected to the tire (not shown) through the tie rod (not shown), and the rotational force of the input shaft (1) is temporarily twisted by the torsion bar (6) by the ground resistance of the tire. Will be raised.

At this time, the input shaft 1 is assembled with the V groove plate coupled to the upper end by press-fitting, and the V groove having several V grooves fixed in the rotational direction to the pin installed at the upper end of the valve body 3 is formed by the base. It is aligned with the ball.

In addition, the electric current applied to the solenoid valve 19 from the electronic control unit 100 at the low speed is strong, so that the displacement and the force generated at the solenoid valve 19 are stronger, and the solenoid valve is stronger than the force pushing the spring 27, and thus the (21) closes the flow path at the inlet, passes through the etched portion of the spool 21, and the low pressure and low sulfur hydraulic oil acts as the reaction chamber 52.

Therefore, the interference force between the V-groove plate, V-groove base and ball is weak so that the mutual displacement (O) between the input side (1) and the valve body (3) can be generated only by the torsional torque of the torsion bar. This makes the flow easier so that the driver can easily turn the steering wheel.

In addition, since the current applied to the solenoid 19 in the electronic control unit 100 at a low speed is weak, the displacement and the force generated at the solenoid valve 19 are weak, and the solenoid valve is weaker than the force applied by the spring 27, causing a spline ( 21 opens the flow path at the inlet, passes through the etched portion of the spool 21, and pneumatic and high flow hydraulic oil is operated in the reaction chamber 52.

At this time, the force generating the mutual displacement (O) of the input shaft (1) and the valve body (3) by the tangential force of the V groove base, the V groove plate and the ball can be increased to increase the force for the driver to turn the handle. .

As described above, the present invention receives an electrical signal such as a vehicle speed from the electronic control unit and applies an appropriate current to the solenoid to provide an appropriate hydraulic pressure to the reaction mechanism unit, thereby generating a reaction force in improving the linear stability to the vehicle speed. And V-groove base's simple structure improves workability and productivity, and can be easily assembled by press-fitting with the input shaft to improve assembly, and the reaction force is raised above the valve body to simplify the shape. By providing a hydraulic reaction device, it is intended to obtain the effect of improving the linear stability at high speed driving and generating steering assistance at low speed.

Claims (2)

Rotary valve as a means for setting the flow path for generating steering assistance force in the steering wheel for automobiles, a reaction mechanism portion for generating an appropriate reaction force as the vehicle speed increases, a spool having a decompression function, and a solenoid valve for controlling the displacement of the spool ( 19), a steering device having an electronic control unit 100 for applying an appropriate current thereto, and a sensor for generating an appropriate electric signal and having a reaction mechanism, wherein a V groove base is installed on the V groove plate of the reaction mechanism. It is fixed to the valve shaft (3) to the input shaft by the V-groove plate and press-fit the fan to the upper end of the valve body (3) thereby fixing the reaction mechanism to install the hole in the rotational direction and slidable in the axial direction. Automotive steering device characterized in that. The vehicle steering apparatus according to claim 1, wherein the V groove base is provided with a seal for preventing internal loss of the V groove base.