KR100753766B1 - Relief valve of a shock absorber capable of self-levelizing - Google Patents

Abstract

The present invention relates to a relief valve of a height adjustable shock absorber.

The present invention relates to a relief valve of a garage adjustable shock absorber provided on the low pressure chamber side to distribute the oil of the high pressure chamber to the low pressure chamber when the pressure of the high pressure chamber is excessively increased to maintain the pressure of the high pressure chamber. A holder having a first orifice vertically formed at a center thereof so as to be in communication with the high pressure chamber side, and having an insertion groove formed at a predetermined depth in a central portion thereof; The sheet is press-fitted into the insertion groove of the holder from the top, and has a sheet portion having a second orifice vertically formed at the center thereof so as to have a predetermined thickness at the lower end thereof, so that the oil flowing from the holder is discharged to the low pressure chamber side. It includes a one-piece housing.

Therefore, it is possible to achieve cost reduction by simplifying parts and to realize accurate relief pressure, thereby improving performance.

Description

RELIEF VALVE OF A SHOCK ABSORBER CAPABLE OF SELF-LEVELIZING}

1 is a cross-sectional view showing a conventional height adjustable shock absorber,

Figure 2 is a cross-sectional view showing a relief valve of the height adjustable shock absorber according to the present invention.

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

10: inner tube 11: road guide

12: oil seal 13: tension chamber

14: compression chamber 20: piston rod

21: pump tube 22: pump rod

22a: hollow 22b: leveling port

23: inlet valve 24: outlet valve

25: pump chamber 27: vehicle mounting portion

30: piston valve 31: body

32: Orifice 33: Disc

34: tightening bolt 40: base valve

41: Euro 1 42: Euro 2                 

50: outer tube 51: packing case

52: cap 60: low pressure chamber

70 gas chamber 71 diaphragm

80: high pressure chamber 90: relief valve

91: holder 91a: first orifice

91b: Insertion groove 92: Housing

92a: Through hole 93: Valve seat

93a: second orifice 93b: ball support groove

94: ball 95: spring guide

96: spring 98: chamber

900: relief valve 910: holder

910a: first orifice 910b: insertion groove

920: sealing plate 920a: through hole

930: integrated seat housing 930a: seat

930a-1: the second orifice 930a-2: ball support groove

930b: Through hole 930c: Curling part

940: Ball 950: Spring Guide

960: spring

The present invention relates to a relief valve of a height adjustable shock absorber (shock absorber), and more particularly, to reduce the manufacturing cost by integrating the housing and the valve seat into one component, and to accurately control the spring displacement to relief pressure It is related with the relief valve of the height adjustable shock absorber to realize the high level.

In general, a shock absorber for a vehicle is installed between the axle and the vehicle body to absorb vibrations or shocks received by the axle from the road surface while driving the vehicle to improve ride comfort. The interior of the shock absorber can increase damping force. So that the filling of gas and oil is filled.

And, in a vehicle carrying a relatively large number of passengers or cargoes, the garage is changed according to the number of passengers and cargoes, which is less or less. Since the height change of the vehicle reduces the ride comfort and steering stability, it is related to the load change of the vehicle. A so-called self-leveling shock absorber has been developed that has the ability to maintain a constant garage without the need.

1 is a cross-sectional view of the conventional height-adjustable shock absorber.

The inner tube 10, the rod guide 11, the piston rod 20, the piston valve 30 and the base valve 40, which are assembled to the inner tube 10, and is installed in the hollow of the piston rod 20 A pump tube 21 and a pump rod 22, and an inlet valve 23 and an outlet valve 24 are provided at one end of the pump rod 22 and one end of the pump tube 21, respectively. The low pressure chamber 60, the gas chamber 70, and the high pressure chamber formed between the outer tube 50 positioned outside the inner tube 10, the inner tube 10, and the outer tube 50. 80).

The inner tube 10 has a piston rod 20 is inserted into the oil filled inside, the upper end of the rod guide 11 and the oil seal 12 is sealed.

Piston rod 20 is a pump tube 21 is installed in the hollow formed inside to adjust the height of the vehicle, the hollow pump rod 22 is inserted into the pump tube 21 inside the pump chamber ( 25 is formed, the upper end of the pump rod 22 is provided with an inlet valve 23, the upper end of the pump tube 21 is provided with an outlet valve 24 that is opened and closed by the up and down operation of the piston rod 20. The pump rod 22 is provided with a leveling port 22b penetrating in the horizontal direction at an intermediate position. In addition, the vehicle mounting portion 27 is formed on the upper end of the piston rod 20, the piston valve 30 is coupled to the lower end inserted into the inner tube (10).

The piston valve 30 bisects the inside of the inner tube 10 up and down into the tension chamber 13 and the compression chamber 14, the body 31 is coupled to the lower end of the piston rod 20 in the tension chamber 13 ) And an orifice 32 is provided between the compression chamber 14 and the oil supply path, and a disk 33 blocking the orifice 32 is installed and finally fixed by the fastening bolt 34. .

The base valve 40 is installed at the lower end of the inner tube 10 and has a first flow path between the pump chamber 25 and the low pressure chamber 60 through the hollow 22a of the pump rod 22 therein. A flow path 41 and a second flow path 42 providing a flow path between the compression chamber 14 and the high pressure chamber 80 are formed.

The outer tube 50 is sealed at the upper end by the packing case 51 and the cap 52, and the low pressure chamber 60 and the diaphragm 71 filled with oil between the inner tube 10. The gas chamber 70 and the high pressure chamber 80 which are divided by two are provided, respectively, and the high pressure chamber 80 is pressurized by the gas chamber 70.

And, in the low pressure chamber 60, when the pressure of the high pressure chamber 80 excessively rises, the oil of the high pressure chamber 80 is returned to the low pressure chamber 60 to maintain the pressure of the high pressure chamber 80 by the relief valve 90 ) Is installed.

The relief valve 90 includes a holder 91 having a first orifice 91a vertically formed at a center thereof so as to communicate with the high pressure chamber 80 and having an insertion groove 91b recessed to a predetermined depth in a central portion of the upper side thereof. It includes, the lower end side of the housing 92 is pressed through the insertion groove (91b) of the holder 91 is coupled.

The housing 92 has a shape having an inner hollow portion having an open lower surface thereof, and a through hole 92a is formed on the outer circumferential surface and the upper surface of the intermediate position so that oil can pass to the low pressure chamber 60 side, and in the vertical direction therein. The valve seat 93 is press-installed, and a chamber 98 is formed as a space in which the full length thereof is extended in accordance with the press-in of the valve seat 93. A second orifice 93a is formed perpendicular to the center of the valve seat 93, and a ball supporting groove 93b is formed at a predetermined depth in the center of the upper side thereof, and a second orifice is formed in the ball supporting groove 93b. A metal ball 94 is placed to block the inlet of the 93a, and the ball 94 is supported by the spring 96 and is moved upward by the spring guide 95 which is moved upward while compressing the spring 96. Is supported.

In the conventional height-adjustable shock absorber 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 first raised. While maintaining the state, when a load is generated due to passengers or cargo on the vehicle, the piston rod 20 that was initially raised is lowered.

In this state, as the piston rod 20 reciprocates in the inner tube 10 as the vehicle travels, a pressure difference is formed between the tension chamber 13 and the compression chamber 14 so that the oil is formed in the piston valve 30 and the base. It is distributed through the valve 40, and pumping is started through the pump tube 21 and the pump rod 22.

That is, in the tension stroke, 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 passage 41 to raise the piston rod 20, thereby increasing the tension chamber ( The oil of 13 flows into the compression chamber 14 to generate a damping force.

In the compression stroke, the oil of the compression chamber 14 flows into the tension chamber 13 and the high pressure chamber 80, and the oil of the pump chamber 25 is pumped into the high pressure chamber 80. Then, if the pumping proceeds to continue the pressure rise by the compression of the gas to raise the position of the piston valve 30 to adjust the garage.

The height of the vehicle is adjusted by such an operation, but when the pressure of the high pressure chamber 80 is excessively increased, the oil of the high pressure chamber 80 flows in through the first orifice 91a of the holder 91, and then, After passing through the second orifice 93a of the chamber 98 and the valve seat 93, the ball 94 and the spring guide 95 blocking the ball support groove 93b are pushed upwards, and then the housing ( By passing between the inner surface of the 92 and the spring guide 95 and moves to the low pressure chamber 60 through the through-hole (92a) of the housing 92, the pressure of the excessive high pressure chamber 80 is lowered to maintain a constant state .

However, such a conventional relief valve 90 presses the valve seat 93 into the housing 92 so that the valve seat 93 is positioned through surface contact in the housing 92, which may result in a press-in deviation. There was a problem that the precise control of the relief pressure is difficult.

In addition, since the housing 92 and the valve seat 93 are separate parts, there is a problem that the manufacturing cost is increased.

The present invention was devised to solve the above problems, it is possible to implement the relief pressure to a high degree by precisely controlling the spring displacement, and the height adjustment type that can achieve the cost reduction by using the housing and the valve seat as one part The purpose is to provide a relief valve for a shock absorber.

The present invention for achieving the above object, the garage provided on the side of the low pressure chamber to maintain the pressure of the high pressure chamber by circulating the oil of the high pressure chamber to the low pressure chamber when the pressure of the high pressure chamber is excessively increased A relief valve of an adjustable shock absorber, comprising: a holder having a first orifice vertically formed at a center thereof so as to communicate with the high pressure chamber side, and having an insertion groove formed at a predetermined depth in a central portion thereof; The sheet is press-fitted into the insertion groove of the holder from the top, and has a sheet portion having a second orifice vertically formed at the center thereof so as to have a predetermined thickness at the lower end thereof, so that the oil flowing from the holder is discharged to the low pressure chamber side. Provides a relief valve of the height adjustable shock absorber comprising a one-piece housing.                         

Preferably, the sheet integrated housing is characterized in that the upper surface has an open shape, and has a curling portion curled on the outer circumference so that the sealing plate is not detached in a state in which the sealing plate is inserted to block the upper surface side.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

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

Prior to the description, the same reference numerals are given to the same components as in the related art, and detailed description thereof will be omitted.

Figure 2 is a cross-sectional view showing a relief valve of the height adjustable shock absorber according to the present invention.

In the garage-adjustable shock absorber, the relief valve 900 returns oil to the low pressure chamber 60 when the pressure in the high pressure chamber 80 rises excessively, so that the pressure in the high pressure chamber 80 is kept constant. It is installed on the 60) side.

The configuration is such that the holder 910 provided on the lower side so as to communicate with the high pressure chamber 80 and the oil flowing from the holder 910 by press-fitting the upper side of the holder 910 flows out to the low pressure chamber 60 side. It comprises a sheet integrated housing 930 to be.

The holder 910 is formed such that the first orifice 910a is vertically formed at the center of the holder 910 so as to communicate with the high pressure chamber 80, and an insertion groove 910b is formed at a predetermined depth at the center of the upper side thereof.

The sheet integrated housing 930 has an inner hollow portion having an upper surface open, and a through hole 930b is formed on the outer circumferential surface of the intermediate position so that oil can pass to the low pressure chamber 60, and has a predetermined thickness. The seat portion 930a is integrally provided on the sheet portion 930a, and the second orifice 930a-1 is vertically formed at the center of the sheet portion 930a, and the ball supporting groove portion 930a-2 is formed at a predetermined depth in the center of the upper side thereof. Is formed.

The ball support groove 930a-2 is provided with a metal ball 940 to block the entrance of the second orifice 930a-1, and the ball 940 is supported by the spring 960 to be supported by the spring 960. ) Is supported from the top by a spring guide 950 that is moved upward while compressing.

On the other hand, the open upper surface side of the sheet integrated housing 930 is sealed by a sealing plate 920 is installed horizontally, the sealing plate 920 is a sheet integrated housing (930) is inserted into the sheet integrated housing 930 a little ( 930 is installed so as not to be separated by curling the outer periphery. In the figure, reference numeral 930c denotes a curling unit.

As described above, the upper surface side of the sheet integrated housing 930 is opened because either side of the lower surface or the upper surface side must be open to facilitate machining of the inner hollow part, and to seal the opened upper surface side. The sealing plate 920 can be simply manufactured and combined by curling.

Of course, the through hole 920a is formed in the center of the sealing plate 920 so that oil can pass to the low pressure chamber 60.

The operation of the relief valve 900 of the height adjustable shock absorber according to the present invention having the above configuration will be briefly described below.

First, the assembly of the relief valve 900 according to the present invention, the ball 940, the spring guide 950, the spring 960, the sealing plate 920 sequentially positioned, and then the upper outer peripheral edge After assembling the sheet integrated housing 930 to assemble, it is made by inserting the lower end of the assembled sheet integrated housing 930 into the insertion groove 910b of the holder 910 and press-fit.

In this assembling process, in the curling process, the displacement state of the spring 960 may be adjusted, and then the curling part 930c may be formed at a corresponding position.

The action of the relief valve 900 assembled in this way, the oil of the pump chamber 25 is pumped into the high pressure chamber 80 during the compression stroke of the piston rod 20 in accordance with the running of the vehicle, the pumping proceeds continuously When the pressure of the high pressure chamber 80 is excessively increased, the oil of the high pressure chamber 80 flows through the first orifice 910a of the holder 910 and then the second orifice of the sheet integrated housing 930 ( After passing through the 930a-1, the ball 940 and the spring guide 950 blocking the ball supporting groove 930a-2 are pushed upwards, and then the inner surface and the spring guide 950 of the sheet integrated housing 930. By passing through) through the through hole 930b of the integrated housing 930 and through the hole 920a of the sealing plate 920 to the low pressure chamber 60, by lowering the pressure of the excessive high pressure chamber 80 in a constant state Will be maintained.

As described above, the relief valve 900 of the height-adjustable shock absorber according to the present invention can realize a high relief pressure through the accurate displacement control of the spring 960 can improve the performance, the conventional housing 92 It is possible to reduce the manufacturing cost by configuring the valve seat 93 and the one part.

In the foregoing description, it should be understood that those skilled in the art can make modifications and changes to the present invention without changing the gist of the present invention as merely illustrative of a preferred embodiment of the present invention.

According to the present invention, it is possible to achieve cost reduction by simplifying parts and to realize accurate relief pressure to improve performance.

Claims (2)

In the relief valve of the height-adjustable shock absorber provided on the low pressure chamber side to distribute the oil of the high pressure chamber to the low pressure chamber to maintain a constant pressure of the high pressure chamber when the pressure of the high pressure chamber rises excessively, A holder having a first orifice vertically formed at a center thereof so as to communicate with the high pressure chamber side, and having an insertion groove formed at a predetermined depth in a central portion thereof; The sheet is press-fitted into the insertion groove of the holder from the top, and has a sheet portion having a second orifice vertically formed at the center thereof so as to have a predetermined thickness at the lower end thereof, so that the oil flowing from the holder is discharged to the low pressure chamber side. Relief valve of the height adjustable shock absorber comprising an integral housing. The method of claim 1, The sheet integrated housing, The upper surface is open shape, Relief valve of the height-adjustable shock absorber characterized in that it has a curling portion that curled the outer circumference so that the sealing plate is not separated from the state in which the sealing plate is inserted to block the upper surface side.

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