KR100784367B1 - Structure for combining high pressure sealing of a self levelizer damper - Google Patents

Abstract

The present invention is a high pressure sealing coupling structure of a damper provided with a step seal and an oil seal in a structure that is slidingly supported on the outer circumference of the piston rod, the inner oil seal in which the oil seal is located inside And an outer oil seal positioned at an outer side thereof, an inclined surface is formed at one end of the step seal, and an inclined ring having an inclined surface is coupled between the outer oil seal and the structure, the inclined surface of the step seal and the inclined ring The inclined surfaces of the inclined surface form a trapezoidal shape facing each other, and the inner oil seal and the outer oil seal coupled between the step seal and the inclined ring are deformed to correspond to the respective inclined surfaces according to the pressure increase and decrease of oil. It is characterized by varying the tightening force of the seal.

Description

STRUCTURE FOR COMBINING HIGH PRESSURE SEALING OF A SELF LEVELIZER DAMPER}

1 is a schematic cross-sectional view showing a high-pressure sealing coupling structure of a conventional height control damper,

Figure 2 is a schematic cross-sectional view showing a high-pressure sealing coupling structure of the height control damper according to the present invention.

<Explanation of symbols for main parts of the drawings>

10; Piston rod 11; Structure

12; Step seal 13; Oil seal

14; Inclined ring

The present invention relates to a high-pressure sealing coupling structure of the damper for adjusting the height, more specifically to adjust the height of the oil seal in accordance with the pressure acting on the chamber to adjust the height of the ride height can improve the ride comfort without increasing the friction force It relates to a high pressure sealing coupling structure of the damper.

In general, a damper (damper) is installed between the axle and the body of the vibration and shock absorber to absorb the vibration or shock received by the axle from the road surface when driving the vehicle to improve the ride comfort, the interior of the gas to increase the damping force And fillers such as oil are filled.

However, in a vehicle carrying a relatively large number of passengers or cargo, the garage is changed according to a large or small number of passengers or luggage, and the change in height of the vehicle reduces ride comfort and steering stability. Therefore, the damper is also required to maintain a constant height of the car, regardless of the load change of the car.

According to such a request, a damper for adjusting the height of a vehicle, that is, a damper for adjusting the height of a vehicle, has already been developed and disclosed. A typical height adjusting damper includes a tube for adjusting the height of a vehicle, a piston rod and a piston valve assembled to the tube. A pump tube and a pump rod installed in the hollow hole of the piston rod, an inlet valve and an outlet valve respectively provided at one end of the pump rod and one end of the pump tube, and coupled to the bottom of the tube to support the pump rod. And an inner shell, a base shell positioned outside the tube and the inner shell, and a base chamber, a gas chamber, and a high pressure chamber formed between the tube and the inner shell and the base shell.

The tube is filled with oil on the inside, and a through hole is formed at the bottom for the inflow of oil from the inside to the high pressure chamber, and one side of the piston rod is inserted, and the top of the tube is inserted by a rod guide and an oil seal fitted to the piston rod. Is sealed.

The operation of the conventional height control damper is such that the oil of the rebound chamber and the base chamber flows into the compression chamber during the rebound stroke, and the low pressure side oil is sucked into the working volume of the pump tube and the pump rod, that is, the pump chamber. do.

During the compression stroke, the oil in the compression chamber flows into the rebound chamber and the high pressure chamber, at which time the oil in the pump chamber is pumped into the high pressure chamber. Then, if the pumping proceeds to the high pressure side, a pressure rise occurs by the compression of the gas to push the piston valve to raise the position of the piston valve to adjust the garage.

On the other hand, Figure 1 is a view conceptually showing a high-pressure sealing coupling structure of the height adjustment damper according to the prior art, the outer periphery of the piston rod (1) is supported by the structure (2), step inside the structure (2) A seal (3; step seal) and an oil seal (4; oil sea) are combined. The perturbation surface of the structure and the piston rod 1 maintains a fine gap, and the contact surface of the step seal 3 which is in close contact with the outer circumference of the piston rod 1 and exerts a tightening force is raised along the fine gap. It has a shape that can be scratched to prevent leakage. The oil seal 4 plays a role of generating a tightening force so that the step seal 3 comes into close contact with the outer circumference of the piston rod 1. In order to prevent oil leakage, the oil seal 4 increases the elastic characteristics of the oil seal 4. It is preferable to increase the tightening force of the step seal 3, but as the tightening force of the step seal 3 increases, the frictional force with the piston rod 1 increases, resulting in a drop in ride comfort.

The present invention is to solve the above-mentioned conventional problems, causing the oil seal to be deformed according to the pressure acting on the chamber of the damper so that the tightening force of the step seal can be varied to prevent oil leakage without increasing the friction force The purpose is to provide a high-pressure sealing coupling structure of the height adjustment damper that can substantially improve the ride comfort.

The present invention for achieving the above object is in the high pressure sealing coupling structure of the damper is provided with a step seal (oil seal) in the structure that is slidingly supported on the outer periphery of the piston rod, the oil seal It consists of an inner oil seal located on the inner side and an outer oil seal located on the outer side, an inclined surface is formed at one end of the step seal, the inclined ring having an inclined surface is coupled between the outer oil seal and the structure, the step The inclined surface of the seal and the inclined surface of the inclined ring form a trapezoidal shape facing each other, and the inner oil seal and the outer oil seal coupled between the step seal and the inclined ring correspond to respective inclined surfaces according to pressure increase and decrease of oil. It is characterized by varying the tightening force of the step seal while being deformed to form.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

Figure 2 is a schematic cross-sectional view showing a high pressure sealing coupling structure of the height control damper according to the present invention.

As shown, according to a preferred embodiment of the present invention, the inclined ring 14 and the step seal (12) and the oil seal (12) inside the structure (11) slidingly supported on the outer periphery of the piston rod (10) 13; oil seal is combined.                     

The structure 11 is a rod guide sealingly coupled to prevent the oil inside the damper from leaking to the outside and supporting the linear reciprocating motion of the piston rod 10, and the lower end of the structure 11 is formed with a relatively high pressure than the upper end. .

The oil seal 13 according to the present invention constitutes a pair, and the oil seal 13 is located on the inner side in close contact with the inclined surface of the step seal 12 and is located on the outer side in close contact with the inclined surface of the inclined ring 14. It consists of an outer oil seal 13b.

The step seal 12 according to the present invention has a structure capable of applying a tightening force to the piston rod 10 sliding in close contact with the outer circumference of the piston rod 10, but maintains the same shape as in the prior art, but the oil seal 13 The opposite side, which is in close contact with it, forms an inclined surface.

The inclined ring 14 according to the present invention is coupled between the outer oil seal 13b and the structure 11, the surface contacting the outer oil seal 13b forms an inclined surface, the inclined surface and the inclined surface of the step seal 12 The inclined surfaces of the ring 14 have a trapezoidal shape facing each other. More precisely, the trapezoidal shape formed by the inclined surface of the step seal 12 and the inclined surface of the inclined ring 14 should be substantially wider than the upper width of the lower portion to which oil pressure of high pressure is applied.

That is, the high pressure sealing structure according to the present invention has a step seal 12, an inner oil seal 13a, an outer oil seal 13b, and an inclined ring 14 around the piston rod 10 in the structure 11. It has a structure that is sequentially coupled in the centrifugal direction.

Thus, the operation of the combined high pressure sealing structure will be described.

The piston rod 10 is a linear reciprocating motion, the structure 11 is a rod guide sealingly coupled so that the oil inside the damper does not leak to the outside and supports the linear reciprocating motion of the piston rod 10, The lower end has a relatively high pressure than the upper end.

As described above, the sliding surface between the outer periphery of the piston rod 10 and the inner periphery of the lower side of the structure 11 maintains a small gap through which oil can pass, and flows in at such a small interval. The oil forms an oil film on the sliding surface to seal and lubricate the coupling portion between the piston rod 10 and the structure 11.

The step seal 12 in close contact with the outer circumference of the piston rod 10 may be scratched to prevent the leakage of oil that comes up through the minute gap (gap) through a unique shape.

In the pair of oil seals 13 according to the present invention, as the high pressure acts on the inclined surfaces of the step seal 12 and the inclined ring 14, the step seal 12 is pushed toward the piston rod 10 side so that the step seal ( The tightening force of 12) is to be increased.

That is, when a high pressure is formed in the lower part of the structure 11 (rebound chamber) by the damping operation (during rebound stroke) of the damper, the oil pressure introduced at minute intervals acts on the oil seal 13 having a pair of elastic forces to the inner side. As the oil seal 13a and the outer oil seal 13b are dynamically transformed into shapes corresponding to the respective inclined surfaces, The expansion force in the transverse direction is increased, which in turn increases the tightening force of the step seal 12 in the direction of the piston rod 10.

On the contrary, when the oil pressure is relatively low in the lower portion of the structure 11 (rebound chamber) by the damping operation (during the compression stroke) of the damper, the oil pressure acting on the pair of oil seals 13 is lowered and the pair of oil is lowered. When the seal 13 is restored to the initial state, the tightening force of the step seal 12 is reduced while the expansion force in the lateral direction is reduced.

As such, according to the present invention, when the high pressure is formed, the tightening force may be increased to prevent oil leakage, and when the low pressure is formed, the tightening force may be reduced to reduce the friction force between the piston rod 10 and the step seal 12 contact surface. Can be reduced.

It is well known that such a reduction in friction can bring about an effect of improving ride comfort.

As described above, the tightening force of the step seal may be varied by causing deformation of the oil seal according to the pressure acting on the chamber of the damper according to the present invention, thereby increasing the tightening force at the high pressure, and tightening at the low pressure. It can reduce the oil leakage and improve the ride comfort.

What has been described above is just one embodiment for carrying out the high pressure sealing coupling structure of the height control damper according to the present invention, the present invention is not limited to the above embodiment, as claimed in the following claims Without departing from the gist of the present invention, anyone of ordinary skill in the art will have the technical idea of the present invention to the extent that various modifications can be made.

Claims (2)

In the high pressure sealing coupling structure of the damper provided with a step seal and an oil seal in the structure that is slidingly supported on the outer circumference of the piston rod, The oil seal is composed of an inner oil seal located inside and an outer oil seal located outside thereof, An inclined surface is formed at one end of the step seal, An inclined ring having an inclined surface is coupled between the outer oil seal and the structure, The inclined surface of the step seal and the inclined surface of the inclined ring form a trapezoidal shape facing each other, wherein the inner oil seal and the outer oil seal coupled between the step seal and the inclined ring are respectively inclined according to the pressure increase or decrease of oil. High-pressure sealing coupling structure of the damper, characterized in that to vary the tightening force of the step seal while being deformed in a corresponding form. 2. The high pressure of the damper according to claim 1, wherein the trapezoidal shape formed by the inclined surface of the step seal and the inclined surface of the inclined ring is substantially wider than the upper width of the lower portion to which the high pressure oil pressure is applied. Sealing joint structure.

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