KR20050011854A - Damping valve of sterring device - Google Patents

Abstract

PURPOSE: A damping valve of a steering system is provided to open gradually passages according to hydraulic pressure by forming differently constants of a spring for supporting a reverse valve in flowing inversely the hydraulic pressure. CONSTITUTION: A damping valve of a steering system is composed of a gear box forming a cylinder therein; a piston installed to move in the cylinder; a hydraulic tube extended out of the cylinder divided by the piston; a housing formed with a hydraulic port at one side and installed at the side of the hydraulic tube; a combining nut joined on the upper inner periphery of the housing; and a valve body(130) disposed under the combining nut and formed with passages for forward and reverse flows of the hydraulic pressure, separately. The valve body comprises a large passage hole installed in the center and composed of a forward valve elastically supported upward and slid vertically to open and close the passage and a small passage hole disposed radially apart from the large passage hole at the predetermined distance and composed of a reverse valve(150) elastically supported downward and slid vertically to open and close the passage.

Description

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

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 that is axially moved 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 gearbox 10, and a piston 13 is installed inside the cylinder, and the outside of the gearbox 10 is located at the center of the piston 13. The rack bar 12 extending to both sides and 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 passage holes 5 formed in the up and down directions are formed on the outer circumferential side of the valve body 2, and the retainer 6 and the washer 7 are installed on the outer circumferential side of the upper end of the pin 3. Below 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 which supports 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, and thus the damping effect is obtained.

However, as described above, when only one flow path is used for the forward movement moved from the upper side to the lower side and the reverse movement moved from the lower side to the upper side, there is a problem that an operation failure occurs due to the passage blocking phenomenon.

The present invention is to solve the problems as described above, to provide a steering damper that can be configured to separate the flow path during the forward movement and the reverse movement of the hydraulic pressure separately to each other.

1 is a front view of a conventional steering apparatus.

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

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

Figure 4 is a plan sectional view of the damping valve of the steering apparatus according to the present invention.

<Explanation of symbols for the main parts of the drawings>

20: housing 130: valve body

132: Great Euro 134

136a: upper fixing plate 136b: lower fixing plate

138: locking step 140: forward valve

142a: Upper spring 142b: Lower spring

150: reverse valve

152a: upper spring 152b: lower spring

154: one end 156: locking member

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 pipe extending outward of each of the cylinders partitioned by the piston,

A supply port formed at one side and a discharge port formed at the other side, the housing being installed at one side of the hydraulic pipe; A fastening nut fastened to an upper inner circumference of the housing; A valve body installed to be slidable up and down under the fastening nut; A spring which opens upward and downward and is installed between the fastening nut and the valve body to elastically support the valve body downward; A valve installed slidably up and down inside the valve body and having an orifice at the center thereof; It is provided in the lower portion of the valve provides a damping valve of the steering device, characterized in that it comprises a spring for supporting the valve upward.

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.

3 and 4, the damping valve of the present invention is provided with a housing 20 to achieve the appearance of the damping valve, the housing 20 is opened up, down and each hydraulic port ( (Not shown) is formed, the inside of which forms a space of a larger diameter and height.

A fastening nut (not shown) coupled with a feed tube is fastened to an upper portion of the housing 20, and a valve body 130 is installed below the fastening nut.

The valve body 130 is formed by penetrating a large flow path 132 in the vertical direction at the center, and four small flow paths 134 at positions spaced a predetermined distance in the radial direction from the large flow path 132. It is formed to face each other, the fixing plate (not shown) formed in the upper and lower ends of the valve body 130 corresponding to the large flow path hole 132 and the small flow path 134 is fastened to the housing 20.

A forward valve 140 sliding up and down is installed in a large flow path 132 formed by penetrating up and down the valve body 130, and a locking jaw 138 is formed at an upper end of the large flow path 132. The tip of the valve 140 is caught by the locking jaw 138, and the upper and lower springs 142a and 142b are disposed between the upper fixing plate 136a and the forward valve 140 and between the lower fixing plate 136b and the forward valve 136b. ) Is inserted to elastically support the forward valve 140. In the above, the lower spring 142b has a larger elastic force than the upper spring 142a so that the forward valve 140 is always supported upward.

One end jaw 154 is formed on the inner surface of the low temperature furnace ball 134, and a reverse valve 150 having a locking member 156, which is bent and adhered to the one end jaw 154, is installed at the lower hole hole. The reverse valve 150 is slidable up and down in the low flow hole 134, and the upper and lower springs 152a and 152b are inserted and elastically supported between the upper and lower fixing plates 136a and 136b in the upper and lower portions. In the above, the upper spring 152a has a larger elastic force than the lower spring 152b so that the reverse valve 150 is always supported downward.

In addition, the four low-temperature holes 134 are formed to face each other, and the spring constant for elastically supporting the reverse valve 150 inserted into the low-temperature hole 134 is formed to be different from each other by pairing with the opposite portion. . That is, the spring supporting the reverse valve 150 inserted into the other two small sole hole 134 symmetric with the elastic force of the spring supporting the reverse valve 150 inserted into the two small sole hole 134 symmetrically. The elastic force of the different sizes will be formed. The number of small pores in the above can be added or subtracted according to the needs of the designer.

The upper and lower ends of the reverse valve 150 and the upper and lower ends of the forward valve 140 make a predetermined groove to facilitate mounting of the springs 142a, 142b, 152a, and 154b.

Referring to the operation of the configuration according to the present invention as described above are as follows. As shown in FIG. 3, first, in the forward movement of hydraulic pressure, the small flow hole 134 is closed by the hydraulic pressure acting on the upper end of the reverse valve 150 and the upper end of the locking member 156, and the large flow path 132. ) Is the hydraulic valve acting on the upper end of the forward valve 140, the forward valve 140, the upper and lower springs (142a, 142b) is pressed and sliding while the flow path is opened to move the hydraulic pressure.

On the contrary, in the reverse direction of hydraulic pressure, the large flow path hole 132 is closed by the hydraulic pressure acting as the lower portion of the forward valve 140, and the low flow path hole 134 is opened by the hydraulic pressure upwards of the reverse valve 150 to supply the hydraulic pressure. Is moved. However, since the elastic force of the springs supporting the reverse valve 150 is different from each other, when the reverse hydraulic pressure is low, a pair of small hole holes 134 having a small spring force are opened first, and the reverse hydraulic pressure is a certain amount. In the above, the other pair of soybean ball 134 is opened. That is, by selectively opening the reverse valve 150 in accordance with the high and low hydraulic pressure to obtain the optimum damping effect.

The number of low-temperature holes 134 formed in the valve body 130 in the above can be formed by adding or subtracting according to the needs of the designer, by installing different spring constants installed in each of the low-temperature holes 134 different from the hydraulic By selectively opening according to the height, the optimum damping effect is obtained.

As described above, according to the present invention, by providing a separate flow path for the forward movement and the reverse movement, it is possible to prevent the blockage of the flow path, and to form a constant constant of the spring for supporting the reverse valve during the reverse movement, the flow path according to the hydraulic elevation Can be opened sequentially so that an optimum damping effect can be obtained.

Claims (4)

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 thereof and installed at one side of the hydraulic pipe; A fastening nut fastened to an upper inner circumference of the housing; Damping valve of the steering device, characterized in that it comprises a valve body formed separately in the lower portion of the fastening nut in the forward movement and the reverse movement of the hydraulic pressure. The method of claim 1, The valve body has a large passage hole installed in the center of the forward valve for opening and closing the flow path while being elastically supported by the spring up and down; Damping valve of the steering apparatus, characterized in that it comprises a low-flow ball is installed in the radial direction of the large flow path in the radially spaced apart position by a spring and the reverse valve for opening and closing the flow path while sliding up and down by a spring. The method of claim 2, Damping valves of the steering apparatus, characterized in that at least one of the small hole is formed according to the needs of the designer. The method of claim 3, A spring for elastically supporting the reverse valve installed in the low water hole has a damping valve of the steering apparatus, characterized in that each having a different spring constant.