KR20030060278A - Gas filling apparatus for shock absorber - Google Patents

Abstract

PURPOSE: A gas filling device of a shock absorber is provided to prevent damage to an oil seal and to maintain a compressing force evenly. CONSTITUTION: A gas is filled through an upper part of a base shell(3), and an oil seal(6) installed in a piston rod(4) is pressed inside of the base shell by a compressing maintaining member(150). The compressing maintaining member is composed of a compressing maintaining bar(154) and a hydraulic cylinder(160) to lift the compressing maintaining bar. The compressing maintaining bar is installed in a guide housing(152) pressing the oil seal to the inside of the base shell.

Description

Gas filling device of shock absorber {GAS FILLING APPARATUS FOR SHOCK ABSORBER}

The present invention relates to a gas filling apparatus of a shock absorber, and more particularly, to a gas filling apparatus of a shock absorber to prevent damage to the oil seal and to maintain a constant axial force.

In general, a vehicle is provided with a suspension device to protect the vehicle body while preventing the impact transmitted from the ground to the driver.

As described above, the suspension provided in the vehicle is composed of a spring, a shock absorber, etc., the spring absorbs the shock transmitted from the ground, and the shock absorber suppresses the expansion of the contracted spring, Damping vibration by expansion.

As shown in FIG. 1, the shock absorber 1 that suppresses the expansion of the spring as described above includes a tube 2, a base shell 3, a piston rod 4, a rod guide 5, and oil. The seal 6 is comprised as a main structural member.

Then, the shock absorber 1 assembles the tube 2 in the interior of the base shell 3 and injects oil, and then the piston rod 4, the rod guide 5, and the oil to the tube 2. The seal 6 is sequentially transferred to the gas filling device in the assembled state, so that the primary coking of the base shell 3 is performed at the same time as the gas injection.

Figure 2 is a front view schematically showing a gas filling device 10 of the conventional shock absorber, Figure 3 is an enlarged cross-sectional view of the gas filling unit shown in FIG.

As shown in FIG. 2, the gas filling device 10 of the conventional shock absorber includes a gas filling unit 100, and the gas filling unit 100 includes a base plate 12 supporting the linear motor. It is provided in the frame 24 via the guide 22, and it is installed so that it may raise and fall along the linear motor guide 22 by operation of the gas filling unit lifting actuator 26. As shown in FIG.

The upper plate 14 and the lower plate 16 are provided at the upper and lower portions of the base plate 12, and side plates 18 are provided at both ends of the upper plate 14 and the lower plate 16, respectively. .

The lower part of the gas filling unit 100 is provided with a clamp 30 that clamps the shock absorber 1 firmly, and the lower part of the clamp 30 carries the shock absorber 1 transferred by a conveyor system (not shown). A lifting table 40 is installed to raise the clamp 30 to the clamping position.

The gas filling unit 100 includes a rod chucking means 110, a caulking jig 102, and a guide housing 108.

The rod chucking means 110 is for chucking the piston rod 4 of the shock absorber, and includes a collet chuck 112, a driving unit 120 for driving the collet chuck 112, and a collet chuck. An elevator 130 and a load sensing bar 116 and a load sensing bar sensor 117 for elevating 112 are provided.

And the collet chuck 112 is composed of a collet support bar 113 formed with a hollow portion to which the load sensing bar 116 is coupled, and a collet 114 installed in a plurality of pieces at the end of the collet support bar 113.

The collet chuck driving unit 120 is for tightening the collet 114 having a conical shape, and includes a cylinder 124 installed at the bottom of the nut housing plate 122, and a hollow portion to which the collet support bar 113 is coupled. The piston rod 4 inserted into the collet 114 is formed in a cylindrical shape and an inclined curved surface opposite to the inclined curved surface of the collet 114 is formed on the inner circumferential surface thereof. It consists of a collet pressure bar 126 to be chucked, and a connecting plate 128 connecting the cylinder 124 and the collet pressure bar 126.

The collet chuck lifting unit 130 includes a servo motor 131, a ball screw 132, and a pulley 133 and a timing belt 134 that transmit power of the servo motor 131 to the ball screw 132. And a nut housing 135 coupled to the ball screw 132 and a nut housing plate 136 fixed to the nut housing 135 to convert the rotational motion of the ball screw 132 into a linear motion.

In addition, the rod detection bar 116 is inserted through the hollow portion of the collet support bar 113 in the longitudinal direction so that the lower end thereof may contact the piston rod 4, and the upper end thereof is the rod detection bar detection sensor 117. A stopper 119 is provided to stop the detection of the detection unit 118 and the load detection bar 116 by the (). That is, the stopper 119 is no longer lowered by being caught by the weight on the top of the collet support bar 113.

And the rod detection bar detection sensor 117 is fixed to the nut housing plate 136 through the detection unit 118 when the rod detection bar 116 is lifted above the set height by the piston rod (4) By sensing, the lowering of the rod chucking means 110 can be controlled.

And the lower plate 16 of the gas filling unit 100 is provided with a guide housing 108 for receiving the collet 114 and the collet pressure bar 126, an oil seal (inside) of the guide housing 108 A pusher 107 for pressing 6) is provided, and a caulking jig 102 having a gas inlet 104 and a caulking protrusion 106 is provided at an end of the guide housing 108. In the caulking jig 102, a shock absorber sensor 102a and an oil seal sensor 102b are provided.

The gas filling device of the conventional shock absorber configured as described above operates as follows.

First, when the shock-absorbed oil absorber is supplied to the lift unit through a conveyor (not shown), the lift unit 40 is raised to raise the shock absorber to the clamping position, and then the clamp 30 clamps the shock absorber 1. To fix the position.

The gas filling unit 100 is first lowered by the gas filling unit elevating actuator 26. The gas filling unit 100 descends until the shock absorber sensor 102a contacts the upper end of the shock absorber. By the primary lowering of the gas filling unit 100, the outer periphery of the upper end of the shock absorber is inserted into a sufficient length to be sealed to the gas inlet 104 of the caulking jig 102.

Subsequently, the rod chucking means 110 is lowered by the collet chuck lifting unit 130. As the rod chucking means 110 descends, the male thread portion of the piston rod 4 is inserted into the collet 114 to lift the rod sensing bar 116 so that the sensing unit 118 of the rod sensing bar 116 is the rod sensing bar. It stops when detected by sensor 117.

On the other hand, in the driving of the collet chuck lifting unit 130, the ball screw 132 is rotated by the driving of the servo motor 131, and the nut housing 135 and the nut housing plate 136 are rotated by the ball screw 132. ) Rises and falls in the vertical direction.

Subsequently, the collet pressure bar 126 is lowered by the cylinder 124 of the collet chuck driving unit 120. The end portion of the collet pressure bar 126 forms an inclined curved surface opposite to the inclined curved surface of the collet 114, so that the plurality of collets 114 are gradually tightened as the descending piston is inserted into the collet 114. Chuck the male threaded portion of the rod (4).

Subsequently, when the rod chucking means 110 is raised, the piston rod 4 chucked by the collet 114 is raised together with the oil seal 6 fitted thereto, so that the upper end of the shock absorber base shell 3 and the oil seal ( 6) There is a space for gas injection. Here, the servo motor 131 of the rod chucking means 110 is stopped when the detection signal is input by the oil seal detection sensor 102b.

Subsequently, gas is injected through the gas injection hole 104 formed on one side of the caulking jig 102, and after the gas is sufficiently injected, the gas filling unit 100 descends to the secondary. The oil seal 6 lifted by the secondary lowering of the gas filling unit 100 is pressurized by the pusher 107 to be inserted into the upper end of the base shell 3 and the primary coking of the base shell 3 is performed. .

At this time, the oil seal 6 is inserted into the upper end of the base shell 3 to pressurize the guide rod 5 and the tube 2 to maintain the axial force, and the primary caulking of the base shell 3 is gas filled It is made by the caulking projection 106 formed in the upper surface of the caulking jig 102 which descend | falls with the pressing force of the unit lifting actuator 26. As shown in FIG. And the shock absorber (1) after the completion of the primary caulking is transferred to the following subsequent device is put into the secondary caulking process and finishing process.

However, the gas filling device 10 of the conventional shock absorber configured as described above has a piston rod 4 and an oil seal 6 lifted to inject gas into the gas filling unit for primary coking of the base shell 3. In the process of being pressed by the pusher 107 during the second lowering of the 100 and being inserted into the base shell 3 of the shock absorber, more pressing force than necessary is transmitted to the oil seal 6, that is, the gas filling unit lifting actuator There is a problem that the driving force of (26) is directly transmitted to the oil seal (6) to damage the oil seal (6).

In addition, the gas filling device of the conventional shock absorber is not provided with a separate axial force holding means for maintaining the axial force, and is to maintain the axial force in the process for the primary caulking of the base shell (3), so that the axial force is constant There was a problem that was difficult to maintain.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object thereof is to provide a shock absorber gas filling device capable of preventing oil seal damage and maintaining a constant axial force.

In order to achieve the above object, the present invention is provided with a rod chucking means, a guide housing and a caulking jig, the gas filling unit for caulking and sealing the end of the base shell after injecting gas through the upper portion of the shock absorber base shell; In the gas filling apparatus of the shock absorber having a axial force maintaining means is provided in the guide housing, pressurizing the oil seal installed in the rod in the state injecting gas through the upper base shell into the base shell to maintain the axial force It is characterized by providing a gas filling device of a shock absorber provided.

1 is a partial ablation front view showing a general shock absorber,

Figure 2 is a front view showing a gas filling device of a conventional shock absorber,

Figure 3 is an enlarged cross-sectional view showing the main portion of FIG.

Figure 4 is a cross-sectional view showing the main portion of the shock absorber gas filling apparatus according to the present invention before the operation of the axial force maintaining means.

5 is a cross-sectional view showing the main portion of the shock absorber gas filling apparatus according to the present invention after the operation of the axial force maintaining means.

6 is a cross-sectional view showing a state in which the upper end of the base shell is caulked at a 45 degree angle.

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

2: tube 3: base shell

4: piston rod 6: oil seal

100: gas filling unit 102: caulking jig

104: gas injection hole 106: caulking projection

107: pusher 110: rod chucking means

120: collet driving unit 130: collet lifting unit

150: axial force maintaining means 152: guide housing

154: Axial force maintaining bar 160: Hydraulic cylinder

162: rod 164: cylinder housing

166: piston

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

The gas filling device of the shock absorber according to the present invention is to add the axial force maintaining means to the gas filling device of the conventional shock absorber shown in Figs. 2 and 3, hereinafter with the prior art shown in Figs. The axial force holding means that is a feature of the present invention will be described together.

The gas filling device of the shock absorber according to the present invention, as shown in Figures 4 and 5, the oil seal (6) installed in the piston rod (4) in the gas injection state through the upper base shell (3) Axial force maintaining means (150) is provided to press the base shell (3) to maintain the axial force.

And the axial force holding means 150 is installed in the guide housing 152 in a state surrounding the collet pressure bar 126 of the rod chucking means 110, the oil seal 6 of the piston rod 4 base shell (3) A) axial force holding bar 154 to pressurize the inside, and the hydraulic cylinder 160 for raising and lowering the axial force holding bar 154.

In addition, the hydraulic cylinder 160 supports the collet pressure bar 126 to be lifted up and down, and one end thereof is coaxially installed with the rod 162 and the rod 162 and is sealed therein. A cylinder housing 164 forming a space and a piston 166 fixed to the rod 162 and reciprocating inside the sealed space of the cylinder housing 164 together with the rod 162.

The gas filling device of the shock absorber according to the present invention configured as described above is to maintain the axial force as follows.

First, as in the prior art, when oil-supplied temporary assembly shock absorbers are supplied to a lifting unit through a conveyor (not shown), the lifting unit 40 is raised to raise the shock absorber to the clamping position, and then the clamp 30 is absorbed. (1) is clamped to fix the position.

In addition, the gas filling unit 100 is first lowered by the gas filling unit elevating actuator 26 so that the outer periphery of the upper end of the base shell 3 of the shock absorber may be sealed to the gas inlet 104 of the caulking jig 102. It is inserted long enough.

As the rod chucking means 110 descends and rises while the male screw portion of the piston rod 4 is chucked, the piston rod 4 is lifted from the base shell 3 and the upper end of the base shell 3 of the shock absorber. A space for injecting gas is provided between the oil seals 6.

And after the gas is injected through the gas inlet 104 formed on one side of the caulking jig 102, and the gas is sufficiently injected, the axial force maintaining means 150 according to the features of the present invention is operated to maintain the axial force do.

That is, as shown in FIG. 4, the piston 166 is connected to the rod 162 by the pressure of the fluid applied to the hydraulic cylinder 160 in the state where the axial force maintaining bar 154 of the axial force maintaining means 150 is raised. As shown in FIG. 5, the axial force maintaining bar 154 connected to the end of the rod 162 presses the oil seal 6 installed on the piston rod 4 into the base shell 3 to lower the axial force. Will be maintained.

Therefore, in the present invention, since the oil seal 6 can be pressurized with an appropriate load through the hydraulic cylinder 160 of the axial force maintaining means 150, it is possible to prevent the damage of the oil seal generated in the conventional manner.

In addition, in the present invention, it is provided with a separate axial force maintaining means 150 to maintain the axial force, it is possible to always maintain a constant axial force.

As described above, in the state where the axial force is maintained, the gas filling unit elevating actuator 26 is operated so that the gas filling unit 100 is lowered secondly by the caulking projection 106 formed on the upper surface of the caulking jig 102. The end of the base shell 3 is to be primary caulked at a 45 degree angle as shown in FIG. 6. Then, the shock absorber having completed the primary coking of the base shell 3 is transferred to the subsequent apparatus and is put into the secondary coking process and the finishing process.

As described above, according to the gas filling apparatus of the shock absorber of the present invention, it is possible not only to prevent damage of the oil seal generated in the conventional manner, but also to provide an effect of maintaining the axial force at a constant state.

Claims (3)

In the shock absorber gas filling device comprising a rod chucking means, a guide housing, and a caulking jig, the gas filling unit for injecting gas through the upper part of the shock absorber base and then caulking and sealing the end of the base shell, The gas filling device of the shock absorber, which is provided in the guide housing, and has axial force maintaining means for pressing the oil seal installed in the rod while the gas is injected through the base shell into the base shell to maintain the axial force. . According to claim 1, wherein the axial force maintaining means, is installed in the guide housing in a state surrounding the collet pressure bar of the rod chucking means, the axial force holding bar for pressing the oil seal of the rod into the base shell, and the axial force holding bar to lift A gas filling device for a shock absorber, comprising a hydraulic cylinder. 3. The cylinder according to claim 2, wherein the hydraulic cylinder supports the collet pressure bar so that the collet pressure bar can be lifted and one end thereof is connected to the axial force maintaining bar, and the cylinder housing is installed coaxially with the rod and forms a sealed space therein; And a piston fixed to the rod for reciprocating the inside of the sealed space of the cylinder housing together with the rod.