KR100764225B1 - Damping valve of sterring device - 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 having hydraulic pipes extending outwardly of each of the cylinders partitioned by the piston, the steering apparatus comprising: a housing formed at one side of a supply port at one side thereof and a discharge port at the other side thereof; 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 relates to a damping valve of the steering apparatus, characterized in that it comprises a spring installed on the lower portion of the valve to support the valve upward.

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: tightening nut

130: valve body 140: spring

150: protrusion 160: protrusion jaw

170: valve 180: orifice

190: spring

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, to provide a damping valve of a simple structure so that the valve body and the valve slides up and down to vary the area of the flow path to smooth the hydraulic movement in the forward and reverse directions And to provide a damping valve of the steering device is easy to assemble, improved damping reliability.

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.

The damping valve of the present invention is provided with a simple structure to adjust the hydraulic movement in the forward and reverse directions by the vertical sliding operation of the valve body and the valve. As shown in Figure 1 and 3, the housing 110 is provided to achieve the appearance of the damping valve, the housing 110 is opened up and down, the upper side is formed with a supply port, the lower side is discharged Ports are formed, the interior of which forms a space of greater diameter and height.

A fastening nut 120 coupled with a feed tube is fastened to an upper portion of the housing 110, and a valve body 130 is installed at a lower portion of the fastening nut 120 to slide up and down a predetermined distance. ) Is elastically supported downward by a spring 140 installed between the fastening nut 120 and the valve body 130.                     

A predetermined space is formed between the valve body 130 and the housing 110 and this space becomes a flow path. The center of the valve body 130 is opened up and down to form a flow path, the opening area of the lower side is wider than the opening area of the upper side. In addition, the upper outer circumference of the valve body 130 is formed with a protrusion 150 protruding in a flange shape to the outside, and a protruding jaw 160 corresponding to the protrusion 150 is formed in the housing 110. When the valve body 130 is slid downwards, since the protrusion 150 is caught by the protruding jaw 160, the sliding distance to the lower side is limited.

In the valve body 130, a valve 170 having an orifice 180 is inserted and installed in the center thereof, and a spring 190 that elastically supports the valve 170 upward is installed below the valve 170. do. A predetermined space is formed between the valve body 130 and the valve 170, and the predetermined space becomes a flow path.

Referring to the operation of the configuration according to the present invention as described above are as follows. As shown in FIG. 3, first, when the hydraulic pressure is moved from the supply port side to the discharge port side, the hydraulic pressure moved through the upper opening of the valve body 130 moves through the orifice 180 of the valve 170. At the same time, by pushing the valve 170 exposed to the lower portion of the upper opening of the valve body 130 so that the valve 170 slides downward in the elastic support state of the spring 140, the inner circumference of the valve body 130 and the valve ( 170) The flow path formed between the outer circumference is enlarged. That is, only the orifice 180 of the valve 170 passes through the low pressure movement, but the oil pressure smoothly moves through the enlarged flow path during the high pressure movement. At this time, the flow path formed between the valve body 130 and the housing 110 is the valve body 130 is slid downward by the elastic force of the spring 140, so that the protrusion 150 and the housing 110 of the valve body 130 Hydraulic pressure is moved only through the opening of the valve body 130 is closed between the protruding jaw 160 of the).

On the contrary, in the reverse direction of the hydraulic pressure moving from the discharge port side to the supply port side, the hydraulic pressure moves through the orifice 180 of the valve 170 in a constant low pressure state, and the flow path between the valve body 130 and the valve 170 is It is closed by the hydraulic force applied to the lower portion of the 170 and the elastic force of the spring 190. That is, since the hydraulic pressure moves only through the orifice 180, the amount and speed of the hydraulic pressure are lowered and damped. In addition, when the high pressure hydraulic pressure is moved, the entire valve body 130 is slid upward from the elastic support state of the spring 190 by the hydraulic pressure applied to the lower portion of the valve 170 so that the valve body 130 and the housing 110 are moved. The flow path formed in between is enlarged. Therefore, the hydraulic pressure is moved through the orifice 180 of the valve 170 and at the same time, the movement is facilitated through the enlarged flow path between the valve body 130 and the housing 110.

As described above, according to the present invention, when moving in the forward direction, the orifice 180 formed at the center of the valve 170 and the valve 170 are moved through the flow path between the valve body 130 and the valve 170 by sliding of the valve 170. In the reverse movement, smooth movement is possible through the flow path between the valve body 130 and the housing 110 by sliding the orifice 180 and the valve body 130 of the valve 170.

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 freedom of design 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 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; Damping valve of the steering device, characterized in that it comprises a spring installed in the lower portion of the valve to support the valve upward. The method of claim 1, Damping valve of the steering device, characterized in that the spring has a constant spring constant so that it can be varied above a predetermined pressure.

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