KR20050107660A - Relief valve of height control damper - Google Patents

Abstract

The present invention relates to a relief valve of the height adjustment damper, the orifice 112 is formed in the center of the holder 110 is in communication with the high-pressure chamber 80 is installed, the housing 120 on the upper side of the holder 110 A press seat is installed, a valve seat 130 press-fitted into the lower inner side of the housing 120 and directly contacting the holder 110 is installed. The valve seat 130 is mounted on the ball support part 136 of the valve seat 130 and the orifice 138 is mounted. The blocking ball 140 is installed, and supports the ball 140 from the top, and includes a spring guide 150 to move while compressing the spring 160. Therefore, by deleting the chamber between the holder and the housing, there is an effect that the valve seat is prevented from being extracted by preventing the load by the high pressure is added to the front of the housing.

Description

RELIEF VALVE OF HEIGHT CONTROL DAMPER}

The present invention relates to a height control damper of a vehicle, and more particularly, is installed between the vehicle body and the axle of the driving vehicle to attenuate external vibration received from the road surface, and to use the vehicle body vibration during driving regardless of the load of the vehicle. Equipped with a relief valve that maintains the pressure through the oil return to the low pressure chamber when the pressure in the high pressure chamber rises in the height adjustment damper, which can automatically control the height of the vehicle according to the set level. To a relief valve of a height-adjusted damper.

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

However, in a vehicle carrying a relatively large number of passengers or cargoes, the garage is changed according to the number of passengers or luggage, which is less or less, the change in height of the vehicle reduces the 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.

Referring to the attached damper to adjust the height of the conventional vehicle as follows.

1 is a cross-sectional view showing a conventional vehicle height adjustment damper device. As shown, the inner cylinder 10, the rod guide 11, the piston rod 20, the piston valve 30 and the base valve 40 assembled to the inner cylinder 10 to adjust the height of the vehicle And an inlet valve provided at the pump tube 21 and the pump rod 22 installed in the hollow hole of the piston rod 20, one end of the pump rod 22 and one end of the pump tube 21. 23 and an outlet valve 24 are provided. The low pressure chamber 60, the gas chamber 70, and the high pressure chamber 80 formed between the outer cylinder 50 positioned outside the inner cylinder 10 and the inner cylinder 10 and the outer cylinder 50. It includes.

The inner cylinder 10 has one end of the piston rod 20 is inserted into the oil filled inside, the upper end is sealed by the rod guide 11 and the oil seal 12 fitted to the piston rod 20.

The piston rod 20 is equipped with a pump tube 21 in the hollow formed inside to adjust the height of the vehicle, the hollow pump rod 22 is inserted into the pump tube 21 is inserted into the pump chamber ( 25 is formed, the inlet valve 23 is provided at the end of the pump rod 22, the outlet valve 24 is provided at one end of the pump tube 21 to open and close by the up and down operation of the piston rod 20. The leveling port 22b penetrating the pump rod 22 in the horizontal direction is formed.

In addition, the piston rod 20 has a vehicle mounting portion 27 is formed on the upper end, the piston valve 30 is coupled to one end inserted into the inner cylinder (10).

The piston valve 30 divides the inside of the inner cylinder 10 up and down into the rebound chamber 13 and the compression chamber 14, and the rebound chamber is connected to the body 31 coupled to one end of the piston rod 20. An orifice 32 is provided between the 13 and the compression chamber 14 to provide a path of oil, and the piston valve 30 is provided with a disk 33 for blocking the orifice 32, and the disk 33 is When the disk 33 is fixed to the retainer 34 and the disk 33 resists the flow of oil to form a pressure difference, the disk 33 which blocks the orifice 32 is eventually flipped and the oil flows.

The base valve 40 is installed at the lower end of the inner cylinder 10 and has a first flow path providing a path to the pump chamber 25 and the low pressure chamber 60 through the hollow 22a of the pump rod 22 therein. A second flow path 42 providing a path to the compression chamber 14 and the high pressure chamber 80 is formed.

The outer cylinder 50 has a low pressure chamber in which an inner cylinder 10 is inserted inside, an upper end thereof is sealed by a packing case 51 and a cap 52, and an oil is filled between the inner cylinder 10. 60 and the gas chamber 70 and the high pressure chamber 80 which are bisected by the separator 71 are provided, respectively. The high pressure chamber 80 is pressurized by the gas chamber 70.

In addition, a relief valve 90 is installed in the low pressure chamber 60 to maintain the pressure through the oil return to the low pressure chamber 60 when the pressure of the high pressure chamber 80 rises.

The relief valve 90 is provided with a holder 91 communicating from the high pressure chamber 80, and the housing 92 is press-fitted to the upper portion of the holder 91. The valve seat 93 is press-installed in the longitudinal direction at the inner lower end of the housing 92, and the valve seat 93 has a chamber 98 in a space in which the full length thereof is extended by the press-in process. A ball 94 is placed on the upper ball support portion 93b of the valve seat 93, and a spring guide 95 is installed to support the ball 94 as a spring 96 from the top.

In the conventional height adjustment damper device configured as described above, the oil sucked into the leveling port 22b of the pump rod 22 opens the inlet valve 23 and the outlet valve 24 so that the piston rod 20 is raised. Maintain the original state. And if a load is generated due to passengers or cargo in the vehicle, the piston rod 20 that was initially raised is lowered.

In the rebound stroke during operation in such a state, the oil in the low pressure chamber 60 is sucked into the pump chamber 25 side while opening the inlet valve 23 through the first flow path 41 and the piston rod 20. The oil in the rebound chamber 13 flows into the compression chamber 14 to generate a damping force.

During the compression stroke, the oil in the compression chamber 14 flows into the rebound chamber 13 and the high pressure chamber 80, at which time the oil in the pump chamber 25 is pumped into the high pressure chamber 80. Then, when the pumping progresses to the high pressure side, a pressure rise occurs due to the compression of the gas to raise the position of the piston valve 30 to adjust the garage.

At this time, when the pressure of the high pressure chamber 80 rises excessively, oil flows into the chamber 98 and the second orifice 93a of the valve seat 93 through the first orifice 97 of the holder 91. . The introduced oil pushes up the ball 94 and the spring guide 95 which block the ball support part 93b upwards.

The oil exiting the second orifice 93a flows into the low pressure chamber 60 along the through hole 92a of the housing 92. As a result, the pressure of the excessive high pressure chamber 80 is maintained at a constant state.

However, in the conventional relief valve 90, a chamber 98 is generated in the process of press-fitting the housing 92 in a state in which the valve seat 93 is press-fitted to the holder 91, and the chamber 98. When pressure remains, the pressure is applied to the front surface of the housing 92 of the relief valve 90 to cause the housing 92 to be separated by a force greater than the extraction force.

The present invention is to solve the conventional problems as described above, by eliminating the chamber between the holder and the housing, to prevent the load of the high pressure to be added to the front of the housing to prevent the extraction of the height adjustment damper The purpose is to provide a relief valve.

In order to achieve the above object, the present invention, in the height adjustment damper is provided with a relief valve (relief valve) for maintaining the pressure through the oil return to the low pressure chamber when the pressure excessive rise of the high pressure chamber, The valve has an orifice formed in the center and communicates with the high pressure chamber, a housing press-fitted on the upper side of the holder, and a press-fitted inside the lower part of the housing to be in direct contact with the holder. A relief valve of a height adjustment damper includes a seat, a ball mounted on a ball support portion of a valve seat and blocking an orifice, and a spring guide supporting a ball from above and moving while compressing a spring.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a cross-sectional view showing a relief valve of the height adjustment damper according to the present invention, Figure 3 is an excerpt cross-sectional view of the relief valve according to the present invention, the same as the embodiment shown in the prior art refer to Figure 1 The same reference numerals will be described.

The height adjustment damper device for a vehicle according to the present invention includes an inner cylinder 10, a rod guide 11, a piston rod 20, a piston valve 30, and a base valve 40 assembled to the inner cylinder 10. And an inlet valve provided at the pump tube 21 and the pump rod 22 installed in the hollow hole of the piston rod 20, one end of the pump rod 22 and one end of the pump tube 21. 23 and the outlet valve 24, the outer cylinder 50 located outside the inner cylinder 10, the low pressure chamber 60, the gas chamber formed between the inner cylinder 10 and the outer cylinder 50 70 and a high pressure chamber 80.

In the above configuration, the relief valve 100 is installed on the low pressure chamber 60 to communicate with the high pressure chamber 80.

As shown in FIG. 3, the relief valve 100 includes a holder 110, a housing 120, a valve seat 130, a ball 140, and a spring guide 150.

Holder 110 is installed between the inner cylinder 10 and the outer cylinder 50, the lower end is coupled to the upper end of the separator (71). The upper portion of the holder 110 is formed with a pressing portion 114 grooved from the center, the first orifice 112 is formed in the vertical direction in the center of the pressing portion 114 is in communication with the high-pressure chamber (80).

The housing 120 is press-fit to the crimping part 114 of the holder 110. The housing 120 has a hollow portion therein, and forms a plurality of through holes 122 on one side and an upper end thereof.

On the other hand, the valve seat 130 is first press-installed in the lower inner side of the housing 120 before the housing 120 is crimped to the crimping portion 114.

The full length of the valve seat 130 is formed so that it does not deviate even after excessive internal pressure action of the high pressure chamber 80, and is press-fitted to directly contact the upper surface of the holder 110.

The valve seat 130 has a second orifice 138 communicating with the first orifice 112 at the center thereof, and a ball support 136 having an enlarged diameter at the upper end of the second orifice 138 is formed.

The diameters of the first orifice 112 and the second orifice 138 are preferably designed and manufactured in the same manner.

And the O-ring 170 is installed between the lower surface of the valve seat 130 and the upper surface of the holder 110 in contact with each other, thereby preventing the pressure from acting on other parts.

On the other hand, the ball 140 is installed on the top of the ball support portion 136 of the valve seat 130 is installed. The ball 140 is made of a metal material and blocks the entrance of the ball support 136, resulting in blocking the second orifice 138.

And the spring guide 150 holding the upper portion of the ball 140 from the upper side is installed, the spring 160 to the upper portion of the spring guide 150 is supported is installed on the inner upper portion of the housing 120.

Operation of the relief valve of the height adjustment damper according to the present invention configured as described above is as follows.

Referring back to FIG. 2, first, as the piston valve 30 reciprocates in the inner cylinder 10, a pressure difference is formed between the rebound chamber 13 and the compression chamber 14, so that oil is separated from the piston valve 30. It flows through the base valve 40 and starts pumping through the pump tube 21 and the pump rod 22.

That is, in the rebound stroke, the oil of the low pressure chamber 60 is sucked into the pump chamber 25 through the first flow passage 41 and the hollow 22a of the pump rod 22, and the oil of the rebound chamber 13 It enters the compression chamber 14.

During the compression stroke, the oil in the compression chamber 14 flows into the rebound chamber 13 and the high pressure chamber 80, at which time the oil in the pump chamber 25 is pumped into the high pressure chamber 80. Then, when the pumping progresses to the high pressure side, a pressure rise occurs due to the compression of the gas to raise the position of the piston valve 30 to adjust the garage.

When the height of the vehicle is adjusted by such an operation, but excessive internal pressure action of the high-pressure chamber 80 occurs, the oil passes through the first orifice 112 of the holder 110 to the second orifice 138 of the valve seat 130. Inflow. At this time, since the high pressure is directly transmitted to the ball 140, the load acting on the lower end of the housing 120 is minimized, and the detachment of the housing 120 is prevented.

In addition, the O-ring 170 concentrates excessive internal pressure only on the O-ring 170 to prevent the pressure from acting on the other parts.

In addition, since the pressure drop did not occur with the same diameter of the first orifice 112 and the second orifice 138, the performance was improved.

The oil introduced into the second orifice 138 pushes up the ball 140 and the spring guide 150 which block the ball support 136 upward. The oil exiting the second orifice 138 flows into the low pressure chamber 60 along the through hole 122 of the housing 120. As a result, the pressure of the excessive high pressure chamber 80 is maintained at a constant state.

As such, by eliminating the conventional chamber from the relief valve 100, the problem that the housing 120 is extracted by high pressure is improved.

Although the present invention has been illustrated and described with respect to certain preferred embodiments, the present invention is not limited to the above-described embodiments, and a person skilled in the art to which the present invention pertains has the present invention set forth in the claims below. Various modifications may be made without departing from the spirit of the invention.

As described above, the relief valve of the height adjustment damper according to the present invention has the effect of preventing the housing from being extracted by preventing the load caused by the high pressure from being added to the front of the housing by deleting the chamber between the holder and the housing.

1 is a cross-sectional view showing a height adjustment damper of a conventional vehicle,

2 is a cross-sectional view showing a relief valve of the height adjustment damper according to the present invention,

3 is an excerpt sectional view of a relief valve according to the present invention.

<Description of the code | symbol about the principal part of drawing>

10: inner cylinder 11: rod guide

13: rebound chamber 14: compression chamber

20: piston rod 21: pump tube

22: pump rod 23: inlet valve

24 outlet valve 25 pump chamber

30: piston valve 40: base valve

50: outer cylinder 60: low pressure chamber

70 gas chamber 80 high pressure chamber

100: relief valve 110: holder

112, 138: first and second orifices 120: housing

130: valve seat 140: ball

150: spring guide 160: spring

170: O-ring

Claims (4)

In the height-adjusting damper with a relief valve for maintaining the pressure through the oil return to the low pressure chamber in the event of excessive pressure rise in the high pressure chamber, The relief valve, An orifice formed at a center thereof and communicating with the high pressure chamber; A housing press-fitted on the upper side of the holder, A valve seat press-fitted into the lower inside of the housing to be in direct contact with the holder, the valve seat having an orifice and a ball support in the center thereof; A ball placed on the ball support of the valve seat to block the orifice, A spring guide which supports the ball from above and moves while compressing the spring Relief valve of the height adjustment damper comprising a. The method of claim 1, The housing, the relief valve of the height adjustment damper, characterized in that at least one through-hole is formed along the outer peripheral surface. The method of claim 1, Relief valve of the height adjustment damper, characterized in that the orifice of the holder and the orifice diameter of the valve seat is formed to communicate with the same size. The method of claim 1, Relief valve of the height adjustment damper, characterized in that it further comprises an O-ring is installed between the lower surface of the valve seat and the upper surface of the holder in contact with the other portion to prevent the pressure acting on other parts.