KR100764214B1 - Damping Valve on Steering System - Google Patents

Abstract

The present invention is a gearbox for forming a cylinder therein; A piston installed to be movable in the cylinder; A steering apparatus comprising a hydraulic tube extending outwardly of each of the cylinders partitioned by the piston, the steering apparatus comprising: a housing having a hydraulic port formed at one side thereof and installed at one side of the hydraulic tube; A valve body having a through hole formed at a center thereof and installed in an up and down direction of the housing to form a flow path hole between the housing; A spool formed at a center thereof, the spool being inserted in an up and down direction of the through hole of the housing to adjust an orifice area, which is a passage passing portion, between the housing and the housing by vertical sliding; It relates to a damping valve of the steering device, characterized in that it comprises a spring installed at the lower end of the spool to elastically support the spool in the upward direction.

Steering System, Gear Box, Valve, Damping Valve

Description

Damping valve for steering system {DAMPING VALVE OF STERRING DEVICE}

1 is a front view of a general steering apparatus.

2 is a cross-sectional view of a damping valve of a conventional steering apparatus.

3 is a cross-sectional view of the damping valve of the steering apparatus according to the present invention.

<Explanation of symbols for main parts of the drawings>

110: housing 120: valve body

130: Spool 140: Spring

150: valve plate 160: euro ball

170: Retainer 180: Bulkhead

190: orifice

The present invention relates to a damping valve, and more particularly, to a damping valve of an improved steering apparatus to improve steering feeling.

In general, the steering apparatus is provided with a steering shaft provided on the lower side of the steering wheel, a rotary valve connected thereto and a gearbox which is moved in the axial direction according to the hydraulic pressure supplied through the steering wheel to directly operate the wheel of the vehicle.

Meanwhile, as shown in FIG. 1, a cylinder is formed inside the gear box 10, and a piston 13 is installed inside the gear box 10, and both outer sides of the gear box 10 are provided at the center side of the piston 13. Extending to the rack bar 12 is interlocked with it is installed.

At this time, each of the hydraulic pipe is connected between the two sides of the cylinder 14 divided into the left and right by the piston 13 and the rotary valve 11 to the cylinder 14 of one side through the rotary valve 11 On the contrary, when the hydraulic pressure is supplied, the hydraulic pressure is discharged through the hydraulic pipe 15 from the other cylinder 14.

In addition, by adjusting the flow path according to the moving direction of the hydraulic pressure to the hydraulic pipe 15 absorbs the vibration transmitted to the driver and the vibration transmitted to the rack bar 12 from the rack bar 12 inserted in the cylinder 14 to Damping valves are installed to enhance steering.

Figure 2 is a cross-sectional view showing such a conventional damping valve. As shown in the drawing, a housing 1 is formed which is opened in up and down directions and has a hollow inside thereof so as to achieve an external shape of the damping valve.

At this time, the housing 1 is provided to be separated in the upper and lower directions, and the valve body 2 is installed between the upper and lower sides, and the pin extending to the upper and lower sides thereof at the center side of the valve body 2. (3) is inserted, and this pin (3) is elastically supported downward by a spring (4) provided on the outer peripheral side of the lower end thereof.

In addition, a plurality of flow path holes 5 penetrated in the up and down directions are formed on the outer circumferential side of the valve body 2, and retainers 6 and washers 7 are provided on the outer circumferential side of the upper end of the pin 3. At the lower side of the washer 7, a disk 8 which is in close contact with the upper end of the valve body 2 is provided by a spring 4 supporting the pin 3 downwardly.

In addition, a valve plate 9 which is in close contact with the lower end side of the valve body 2 by a spring 4 is also installed at the lower end side of the pin 3, and the valve body in contact with the disk 8 and the valve plate 9 ( A part of the upper side and the lower side of 2) is spaced apart from them and always opens the flow path hole 5 formed therebetween.

At this time, the flow path hole 5 which is always opened between the disk 8 and the valve plate 9 is a flow path hole 5 formed at different positions, through which a small amount of hydraulic pressure can always move upward and downward. Because of this, the hydraulic pressure is always delivered to the inside of the valve.

On the other hand, when larger hydraulic pressure is moved from the upper side to the lower side, the valve plate 9 closing the flow path hole 5 at the lower end of the valve body 2 pushes the spring 4 to open the flow path hole 5 and Since it is moved through, it does not receive much resistance and enables smooth hydraulic movement.

On the contrary, when a larger hydraulic pressure moves from the lower side to the upper side, the hydraulic pressure bends the outer peripheral side of the disk 8 above the valve body 2, which is deformed by the washer 7 provided on the upper side thereof. Because of this limitation, the hydraulic pressure is reduced due to the large resistance and the opening of the narrow passage hole 5, the movement speed and the movement speed is lowered to obtain a damping effect.

However, the conventional damping valve configured as described above has a large number of parts, which is inconvenient to manufacture and assemble, and takes up a lot of installation space, resulting in high production cost and limited installation.

The present invention is to solve the problems as described above, by providing a damping valve of a simple structure to adjust the hydraulic movement in the forward and reverse direction by the vertical sliding of the spool, easy to manufacture and assembly, the volume To reduce the damping valve of the steering device to provide.

The present invention provides a gearbox for forming a cylinder therein to achieve the above object; A piston installed to be movable in the cylinder; A steering apparatus comprising a hydraulic tube extending outwardly of each of the cylinders partitioned by the piston, the steering apparatus comprising: a housing having a hydraulic port formed at one side thereof and installed at one side of the hydraulic tube; A valve body having a through hole formed at a center thereof and installed in an up and down direction of the housing to form a flow path hole between the housing; A spool formed at a center thereof, the spool being inserted in an up and down direction of the through hole of the housing to adjust an orifice area, which is a passage passing portion, between the housing and the housing by vertical sliding; It is provided on the lower end of the spool provides a damping valve of the steering apparatus comprising a spring for elastically supporting the spool upwards.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. The same code | symbol is used about the same structure as the conventional structure. As shown in FIG. 1, a rotary valve 11 is provided at one side of the hollow gearbox 10 formed to the left and the right to protrude upwardly to intersect with the rotary gear 11. One side of the rotary valve 11 may be hydraulic It is connected to the pump.

In addition, a rack bar 12 is installed inside the gear box 10, and a piston 13, which is in close contact with the inner surface of the gear box 10, is installed at an approximately middle side of the rack bar 12 to the left and right sides thereof. A cylinder 14 is formed, and each of the hydraulic pipes 15 connected to the rotary valve 11 is provided outside the cylinder 14.

On the other hand, one side end of the hydraulic pipe 15 is transmitted to the driver side from the rack bar 12 inserted in the cylinder 14 by adjusting the flow path in accordance with the movement direction of the hydraulic pressure moved between the rotary valve 11 and the cylinder 14. Damping valve is installed to absorb the vibration and the vibration of the hydraulic pressure transmitted to the rack bar 12 to improve the steering feeling.

The damping valve of the present invention is provided with a simple structure to control the hydraulic movement in the forward and reverse directions by the vertical operation of the spool. 3 is a cross-sectional view showing a damping valve according to the present invention. As shown in Figure 3, the housing 110 is provided to achieve the appearance of the damping valve, the housing 110 is opened up and down to form a hydraulic port, the inside of the larger diameter and height To form a space.

The valve body 120 is installed in the housing 110, and a through hole penetrating upward and downward is formed at the center side of the valve body 120, and the spool 130 is inserted into the through hole. 130 is elastically supported upward by a spring 140 installed at its lower end.

The lower end of the spool 130 is formed integrally with the valve body 120, has a predetermined thickness, the outer circumference is formed with a valve plate 150 in contact with the inner surface of the through-hole of the valve body 120. A flow path hole 160 penetrating in the up and down directions is formed at the center of the spool 130, and a retainer 170 is installed at an upper end of the spool 130. The spool 130 is installed to reciprocally slide a predetermined distance up and down along the through hole in the through hole.

A flow path is formed between the outer circumference of the valve body 120 and the inner diameter of the housing 110 by a predetermined amount, and a partition wall protruding toward the center of the radial direction along the inner circumferential surface of the housing 110 is disposed at an approximately center of the housing 110 ( 180 is formed, and a fine gap, that is, an orifice 190, is formed between the valve plate 150 and the partition wall 180 of the spool 130 in the spring 140 supported state. That is, the partition wall 180 fixes the valve body 120 and blocks the flow path formed between the valve body 120 and the housing 110 to form the orifice 190.

 In the above spool 130 is slidable up and down, when the orifice is formed, the spool 130 is located at the top by the elasticity of the spring 140, and when the spool 130 is lowered above a certain pressure from the top end, The orifice 190 is enlarged in area. That is, it is possible to move a large amount of flow rate at a time.

Referring to the operation of the damping valve of the present invention configured as described above are as follows. When a small amount (low pressure) of the fluid is moved in the forward direction, it moves through the orifice 190 through the flow path between the valve body 120 and the housing 110 as shown by the arrow from the upper side to the lower side in FIG. When the fluid of the (high pressure) moves, the pressure applied to the upper surface of the valve plate 150 increases, so that the valve plate overcomes the pressure of the spring and the area of the orifice 190 widens as the spool 130 moves downward. That is, the fluid moves while the spool 130 slides in a predetermined amount in association with the pressure.

On the contrary, when the hydraulic pressure moves in the reverse direction, the fluid moves through the flow path hole 160 formed in the center of the spool 130 as shown by the arrow direction from the lower side to the upper side, and the fluid pushes the valve plate 150 upward and the valve body The orifice 190 formed between the 150 and the housing 110 is closed to dampen the moving amount and the moving speed of the fluid. That is, the spring 140 for elastically supporting the valve plate 150 of the spool and the pressure of the fluid applied to the valve plate 150 act as a resistance to close the orifice 190 so that the flow path hole 160 is closed. Since it moves only through, the amount and speed of the fluid are lowered and damped.

As described above, according to the present invention, the flow paths for the forward movement and the reverse movement of the fluid are independently formed by using the spool, so that the degree of design freedom for each parameter can be increased.

Claims (2)

A gear box forming a cylinder therein; A piston installed to be movable in the cylinder; A steering apparatus comprising a hydraulic pipe extending outward of each of the cylinders partitioned by the piston, A housing having a hydraulic port formed at one side and installed at one side of the hydraulic pipe; A valve body having a through hole formed at a center thereof and installed in an up and down direction of the housing to form a flow path hole between the housing; A spool formed at a center thereof, the spool being inserted in an up and down direction of the through hole of the housing to adjust an area of an orifice which is a passage passing portion between the housing by an up and down sliding operation; A spring installed at a lower end of the spool to elastically support the spool upwardly; A partition wall protruding from the center of the housing height along the inner circumferential surface of the housing toward the center in the radial direction, The damping valve of the steering apparatus, characterized in that the orifice is formed between the partition wall and the valve plate formed on the lower end of the spool. delete

Images