KR950003253Y1 - Power steering device - Google Patents

Abstract

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Description

Reaction Controlled Power Steering Device

1 is an exploded view of a reaction force controlled power steering apparatus according to a preferred embodiment of the present invention.

2 is a vertical cross-sectional view of the reaction force-controlled power steering apparatus shown in FIG.

3 is an enlarged view of the reaction force of the power steering apparatus at high speed.

4 is a side view showing a state in which a pin is inserted into the V groove in FIG.

5 is a cross-sectional view showing a reaction force of the power steering device at low speed.

6 is a side view showing a state in which the pin is separated from the V groove in FIG.

7 is a schematic view showing the X, Y displacement of the piston in the conventional power steering apparatus.

* Explanation of symbols for main parts of the drawings

2: input shaft 3: torsion bar

4 pinion shaft 6 valve body

8: reaction chamber 15,16: V groove

18: reaction pin 19: slider

The present invention relates to a reaction force-controlled power steering apparatus, and more particularly to a reaction force-controlled power steering apparatus that can lighten or weight the steering wheel handle through the axial reaction force to stabilize the movement of the steering wheel according to the speed of the vehicle.

Installation of the power steering device of the vehicle makes the steering wheel smoother, but such a power steering device requires a great care for driving because the steering wheel is light at high speed. Therefore, a power steering device that can make the operation of the handle heavy at high speeds has been developed and used. For example, Korean Patent Publication No. 89-1395 discloses a power steering device that regulates the torsion bar's torsion by using reaction force piston, which forms a V-groove on the input shaft and transverses the cylinder block. The reaction force piston installed in the directional chamber so as to be slidable in the radial direction is coupled to the V-groove of the input shaft so that the operation of the handle at high speed can be made heavy.

Such a conventional power steering device, as shown in FIG. 7, not only generates noise when the reaction force piston contacts the V groove and is displaced in the x and y directions, but also the action of the reaction force is generated between the input shaft and the pinion. Since the reaction force has to be large because it is transmitted to the valve body connected to the valve body, the pressure applied to the reaction chamber of the valve is large, so that fluid movement inside the valve is not desired. In particular, the power steering device is a complex structure and the overall volume is large, there is a closure that the manufacturing cost is increased.

Therefore, the present invention is designed to solve these problems and disadvantages of the related art. An object of the present invention is to provide a reaction force controlled power steering device capable of generating a sufficient reaction force by low pressure.

Another object of the present invention is to provide a reaction force-controlled power steering device that can obtain a quick response by minimizing the reaction force in the valve body and to reduce the size of the product.

The object of the present invention is a valve having an input shaft, a torsion bar mounted in the input shaft, a pinion shaft in which a lower end of the torsion bar is press-fitted therein, a flow path and the input shaft and the pinion shaft are provided therein. In the main body having a main body, a reaction chamber is formed by the input shaft, the pinion shaft and the valve body, and a plurality of V grooves are formed in the input shaft so as to be located in the reaction chamber, and each V groove of the input shaft A bush having a V groove formed therein is press-fitted into the valve body, and the V grooves are arranged in a substantially parallel relationship, and a reaction pin is installed in each V groove so that the reaction pin can move up and down in the reaction chamber. It can be achieved by providing a reaction force controlled power steering device characterized by being supported by an installed slider.

Referring to the reaction force-controlled power steering device of the present invention with reference to the accompanying drawings as follows.

FIG. 1 is an exploded view of a reaction force controlled power steering apparatus according to a preferred embodiment of the present invention, and FIG. 2 is an assembled cross-sectional view of FIG. 1, wherein the reaction force controlled power steering apparatus 1 includes an input shaft 2 and the input shaft. The torsion bar 3 mounted in (2) and the pinion shaft 4 in which the lower end part of the torsion bar 3 were press-fitted are provided. The upper end of the torsion bar 3 is fixed to the input shaft 2 by a fixing pin 5. The input shaft 2 and the pinion shaft 4 are installed in the valve body 6, and the pin 7 fixed to the pinion shaft 4 is inserted into the slot 20 of the valve body 6. have. The upper end of the input shaft 2 is provided with a clip ring 21 to limit the upward movement of the valve body (6).

The reaction chamber 8 is formed by the input shaft 2, the pinion shaft 4 and the valve body 6, and the reaction chamber 8 is provided with a reaction mechanism as described later. The valve body 6 is provided with a flow passage 11 through which the hydraulic fluid is supplied into the reaction chamber 8 through the suction flow passage 10 by the operation of the normal solenoid valve 9.

The clip ring 12 is fixed to the lower side of the input shaft 2, and in the middle region of the input shaft 2, the oil passage 14 so that the hydraulic oil of the reaction chamber 8 can be supplied into the chamber 13 of the input shaft 2. ) Is formed.

Referring to the reaction mechanism provided in the reaction chamber (8) according to the present invention in detail, the input shaft (2) has a plurality of V grooves 15, for example four V grooves 15 adjacent to the flow path (14) And a bush 17 having a V groove 16 corresponding to each V groove 15 of the input shaft 2 is press-fitted in the valve body 6 so as to be located on the outer circumferential surface of the input shaft 2. .

Each of the V grooves 15 and 16 of the input shaft 2 and the bush 17 is arranged in a substantially parallel relationship, and a reaction force pin 18 is provided in the V grooves 15 and 16.

In the reaction force pin 8, the slider 19 for supporting each reaction force pin 18 is configured to be moved up and down along the input shaft 2.

Referring to the operation of the reaction force-controlled power steering device of the present invention is as follows. FIG. 3 is an enlarged view of portion A of FIG. 2 showing the reaction force of the power steering device at high speed of the vehicle. FIG. 4 is a side view of the reaction pin inserted into the V-groove in FIG. 3, and the solenoid valve ( Since 9) is opened, hydraulic oil is supplied from the oil pump (not shown) into the reaction chamber 8 through the suction passage 10 (see FIG. 2) and the flow passage 11 of the valve body 6. At this time, the hydraulic pressure in the reaction chamber 8 raises the slider 19 so that the reaction force pin 18 of the bush 17 press-fitted into the V-groove 15 of the input shaft 2 and the valve body 6. It comes in close contact with the V groove 6. When the reaction force pin 18 is inserted into the V grooves 15 and 16, the input shaft 2 and the valve body 6 are fixed to the reaction force pin 18, and the valve body 6 is the pinion shaft. Since it is fixed by the pin 4 and the pin 7, the pinion shaft 4 is connected to the wheel shaft when the input shaft 2 is rotated. Thus, a reaction force is applied to the rotation of the input shaft 2 so that the handle Will become heavy. Therefore, the steering power is increased during high-speed driving, the steering wheel operation is difficult, thereby increasing the stability of the driving.

In addition, the working oil supplied into the reaction chamber 8 flows between the input shaft 2, the valve body 6, and the slider 19, and flows into the chamber 13 through the flow passage 14 of the input shaft 2. Drained by oil pump.

On the other hand, the slider 19 pushes the reaction force pin 18 to press the V-groove 15 and 16 of the input shaft 2 and the bush 17 to push the input shaft 2 and the valve body 6 into the pinion shaft 4. ), But the input shaft (2) is fixed to the torsion bar (3) by the fixing pin (5) and the torsion bar (3) is the lower end is pressed into the pinion shaft (4), so the pressure shaft ( 2) The phenomenon in which the pinion shaft 4 is separated does not occur at all. In addition, the valve body 6 is secondarily blocked by the pin 7 fixed to the pinion shaft 4 by its movement by the clip ring 21 provided at the upper end of the input shaft 2.

When the hydraulic oil is supplied into the reaction chamber 8, a slight flow occurs in the valve body 6 in the direction of the input shaft 2 through the slot 20, but the flow in the rotational direction is supported by the pin 7. .

FIG. 5 is a side view showing the reaction force of the power steering device at a low speed of the vehicle, and FIG. 6 is a side view showing the reaction force pin is disengaged from the V groove in FIG. 5, and at the low speed, the solenoid valve 9 is closed to The supply of is cut off so that the internal pressure of the reaction chamber 8 drops. Thus, the slider 19 is lowered and restrained on the clip ring 12, whereby the reaction force pin 18 is supported on the slider 19 so that the V-groove 15 of the input shaft 2 and the bush 17 ( 16) is connected to the lowest surface.

When the reaction force pin 18 is disengaged from the V grooves 15 and 16, the input shaft 2 and the valve body 6 are released, and as shown in FIG. 6, the V groove 15 is shown. Between the 16 and the reaction force pin 18, there is a play that the input shaft 2 can rotate to some extent. Therefore, since the reaction force by the reaction force pin 18 is not received at low speed, the rotation is possible with a small force when the input shaft 2 is rotated. Therefore, the steering force may be reduced due to the reduction of the steering force during the stop or low speed driving. It is easy to operate.

As described above, according to the reaction force-controlled power steering apparatus of the present invention, by applying the reaction force inside the valve body with a simple configuration, it is possible to provide a sufficient reaction force for the rotation of the input shaft even by the low pressure of the reaction chamber, and the product can be miniaturized It has merit.

Claims (1)

An input shaft 2, a torsion bar 3 mounted in the input shaft 2, a pinion shaft 4 in which a lower end of the torsion bar 3 is press-fitted therein, and a flow path 11 are formed. In a power steering apparatus having a valve body (6) having an input shaft (2) and a pinion shaft (4) provided therein, a reaction chamber (8) is provided with the input shaft (2), pinion shaft (4) and the valve body. And a plurality of V grooves 15 in the input shaft 2 to be formed in the reaction chamber 8 and corresponding to the respective V grooves 15 in the input shaft 2. A bush 17 having a V groove 16 formed therein is press-fitted into the valve body 6, and the V grooves 15 and 16 are arranged in a substantially parallel relationship, and each V groove 15 ( 16, the reaction force pin 18 is installed so that the reaction force pin 18 is supported by the slider 19 installed in the reaction chamber 8 so as to be movable up and down. War steering.