JP2000120754A - Method and device for assembling hydraulic buffer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the assembly and quality of a hydraulic buffer while simplifying control of parts without penetrating a foreign matter into the inside of the hydraulic buffer in the assembling process of the hydraulic buffer and without damaging a sealing member. SOLUTION: In this assembling device for a hydraulic buffer 1, the upper part of the outer cylinder 2 of the hydraulic buffer 1 is retained by a gas filling head 31, a sealing member 6 temporarily sealed to the hydraulic buffer 1 is pushed up upper than the upper end of the outer cylinder 2 by the vacuum suction force of a vacuum head 32, gas set to a required pressure is filled from the ventilation passage 49 of the gas filling head 31 to the hydraulic buffer 1, the sealing member 6 is pushed and pressed by the vacuum head 32 and retained at a regular assembling position at the upper end of an inner cylinder 3, the gas filling head 31 is moved upper than the upper part of the outer cylinder 2, and the upper end of the outer cylinder 2 is deformed in an inside diametral direction by a caulking device 33 so as to attach the sealing member 6 to the regular assembling position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and an apparatus for assembling a hydraulic shock absorber.

[0002]

2. Description of the Related Art Conventionally, an oil reservoir chamber and a gas chamber are formed between the inner and outer cylinders of a hydraulic shock absorber, and the upper part of the inner and outer cylinders is sealed with a sealing member. And Japanese Patent Publication No. 61-16839 (Prior Art 2).

In the prior art 1, a sealing member is incorporated in the upper inner periphery of an outer cylinder of a hydraulic shock absorber with a gap therebetween, and gas of a predetermined pressure supplied by a gas filling head is supplied to the upper inner periphery of the outer cylinder and the sealing member. Is sealed in the hydraulic shock absorber from the gap, and then the upper portion of the outer cylinder is deformed in the inner diameter direction to close the gap and seal and fix the sealing member.

In prior art 2, a jig is inserted into the inside of a sealing lip of a sealing member properly sealed to the upper inner periphery of an outer cylinder of a hydraulic shock absorber, and the sealing lip is radially moved by the jig. To form a gas introduction passage, a gas at a predetermined pressure is sealed in the hydraulic shock absorber through the gas introduction passage, and after the gas is sealed, the sealed gas is sealed by the restoring force of the sealing lip.

[0005]

However, in the prior art 1, there is a gap between the upper inner periphery of the outer cylinder of the hydraulic shock absorber and the sealing member during the transportation of the hydraulic shock absorber to the assembling apparatus or the like. There is a possibility that foreign matter may enter the inside of the hydraulic shock absorber from the gap, and there is a disadvantage that a cover for closing the gap needs to be provided.

Further, in the prior art 2, when the sealing lip of the sealing member which is properly sealed to the hydraulic shock absorber is spread by a jig, the sealing lip of the sealing member is flawed, thereby deteriorating the quality. There is a fear.

SUMMARY OF THE INVENTION An object of the present invention is to assemble a hydraulic shock absorber while simplifying parts management without invading foreign matter into the inside of the hydraulic shock absorber during the assembly process of the hydraulic shock absorber and without damaging the sealing member. The purpose is to improve the quality.

[0008]

According to the first aspect of the present invention, an oil reservoir and a gas chamber above the oil reservoir are formed between the inner and outer cylinders of the hydraulic shock absorber, and the upper portions of the inner and outer cylinders are sealed with a sealing member. A method of assembling a hydraulic shock absorber, comprising filling the oil shock into a hydraulic shock absorber, holding an upper part of an outer cylinder of the hydraulic shock absorber temporarily sealing a sealing member on an upper inner periphery of the outer cylinder, A gas filling head provided with a ventilation path for filling gas into the hydraulic shock absorber, and a vacuum suction path for applying a vacuum suction force to a space above the sealing member which is provided in the gas filling head and temporarily sealed to the hydraulic shock absorber. And a vacuum head that presses the sealing member to a proper assembly position at the upper end of the inner cylinder in the outer cylinder, and is disposed outside the hydraulic shock absorber, and seals by deforming the upper end of the outer cylinder in the radial direction. Using an assembling device that has a caulking device that attaches the member to the proper assembling position, The upper part of the outer cylinder of the hydraulic shock absorber is held by the pad, and the sealing member temporarily sealed to the hydraulic shock absorber is pulled upward from the upper end of the outer cylinder by the vacuum suction force of the vacuum head, and the gas filled head is ventilated. A gas of a predetermined pressure is sealed from the path into the hydraulic shock absorber, the sealing member is pressed and held by the vacuum head at a regular assembly position at the upper end of the inner cylinder, and the gas sealing head is moved upward from the upper part of the outer cylinder. The upper end of the outer cylinder is deformed in the inner diameter direction by a caulking device so that the sealing member is mounted at a proper assembly position.

According to a second aspect of the present invention, an oil reservoir is formed between the inner and outer cylinders of the hydraulic shock absorber and a gas chamber above the oil reservoir, and the upper part of the inner and outer cylinders is sealed with a sealing member. A device that fills a hydraulic shock absorber with oil, holds an upper part of an outer cylinder of the hydraulic shock absorber in which a sealing member is temporarily sealed on an upper inner periphery of an outer cylinder, and supplies gas to the hydraulic shock absorber. A gas filling head having a gas passage to be sealed, and a vacuum suction path for applying a vacuum suction force to a space above a sealing member which is housed in the gas filling head and temporarily sealed to a hydraulic shock absorber, and is sealed. A vacuum head that presses the member to a regular assembly position at the upper end of the inner cylinder within the outer cylinder; and a vacuum head that is disposed outside the hydraulic shock absorber and deforms the upper end of the outer cylinder in the radial direction to move the sealing member to the regular assembly position. And a caulking device attached to the outer cylinder of the hydraulic shock absorber by the gas filling head. The sealing member, which is temporarily sealed to the hydraulic shock absorber, is pulled upward from the upper end of the outer cylinder by the vacuum suction force of the vacuum head. , The sealing member is pressed and held by the vacuum head at the regular assembly position at the upper end of the inner cylinder, the gas sealing head is moved upward from the upper part of the outer cylinder, and the upper end of the outer cylinder is crimped by the caulking device. The sealing member is deformed in the inner diameter direction so that the sealing member can be attached to a regular assembly position.

According to a third aspect of the present invention, in the second aspect of the present invention, there is further provided a rod holding device for holding a piston rod extending outside through a sealing member of the hydraulic shock absorber, With the sealing member of the hydraulic shock absorber attached to the proper assembly position, the rod holding device is driven up and down so that the performance of the hydraulic shock absorber can be evaluated.

[0011]

According to the first and second aspects of the present invention, the following effects are obtained. With the sealing member temporarily sealed to the outer cylinder of the hydraulic shock absorber, the hydraulic shock absorber is carried into the assembling apparatus, and the temporarily sealed sealing member is pulled upward from the upper end of the outer cylinder of the hydraulic shock absorber to increase the hydraulic pressure. A gas introduction passage to the shock absorber is formed, a gas of a predetermined pressure is sealed in the hydraulic shock absorber through the gas introduction passage, and after the gas is sealed, the sealing member is placed in the outer cylinder at a regular assembly position at the upper end of the inner cylinder. It is to be attached to.

As described above, in the process of transporting the hydraulic shock absorber to the assembling apparatus, the hydraulic shock absorber is temporarily sealed by the sealing member, and there is no risk of intrusion of foreign matter, and parts management can be simplified.

In the above, the sealing member is smoothly pulled up from the upper end of the outer cylinder by the vacuum suction force of the vacuum head, or is pressed by the vacuum head and can be held at a proper assembly position in the outer cylinder. Therefore, the assembly quality of the hydraulic shock absorber can be improved without breaking the sealing lip of the sealing member.

According to the third aspect of the present invention, the following operations are provided. After the hydraulic shock absorber is attached to the regular assembly position of the sealing member in the assembling device, the piston rod held by the rod holding device is moved up and down to thereby move the gas reaction force and damping of the oil shock absorber. Performance such as force can be evaluated.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view showing an assembling apparatus, wherein (A) is a front view, (B) is a side view, FIG. 2 is a fragmentary front view showing a hydraulic shock absorber, and FIG. FIG. 4 is a cross-sectional view showing a state in which a hydraulic shock absorber is set in the assembling apparatus, FIG. 4 is a cross-sectional view showing a crimping margin measurement state of the assembling apparatus, FIG. 5 is a cross-sectional view showing a gas filled state of the assembling apparatus, and FIG. FIG. 7 is a cross-sectional view showing a tightened state, and FIG. 7 is a cross-sectional view showing a performance evaluation state of the assembling apparatus.

In the assembling apparatus 10 shown in FIG. 1, gas is sealed in the hydraulic shock absorber 1 and hermetically sealed. As shown in FIG. 2, the hydraulic shock absorber 1 has an inner cylinder 3 inserted into a bottomed outer cylinder 2, a piston rod 4 inserted slidably into the inner cylinder 3, and an inner cylinder 2. Cylinder 3
Rod guide 5 at the upper end of the seal member (oil seal)
6, the end plate 7 is mounted, and the rod guide 5, the sealing member 6, and the end plate 7 are attached and held by the upper end caulking portion 2A of the outer cylinder 2 at the stage of completion of assembly by the assembling apparatus 10. At this time, the hydraulic shock absorber 1 fills the inside of the inner cylinder 3 with oil as an oil chamber, forms an oil reservoir chamber and a gas chamber above the outer cylinder 2 and the inner cylinder 3, and The upper part of the inner cylinder 3 is sealed with the sealing member 6 described above. The hydraulic shock absorber 1 is provided with an oil return passage 8 in the rod guide 5, and seals oil taken out of the oil chamber of the inner cylinder 3 along with the piston rod 4 when the hydraulic shock absorber 1 expands and contracts. The scraping oil is scraped off by the sealing lip 6, and the scraped oil can be returned from the oil return path 8 to the oil reservoir between the outer cylinder 2 and the inner cylinder 3.

The assembling apparatus 10 includes a hydraulic shock absorber support 11
And a gas filling section 12 and a hydraulic shock absorber performance evaluation section 13 in the column 10A.

The hydraulic shock absorber support portion 11 has a clamp base 22 which can move up and down along a slide guide 21 provided on the front surface of the column 10A. The clamp base 22 can be moved up and down by a clamp cylinder 23. The hydraulic shock absorber 1, which is supported upright, can be set to a gas charging work position where the upper part of the outer cylinder 2 is sealed in the gas sealing portion 12. At this time, the hydraulic shock absorber 1 has the rod guide 5 press-fitted and fixed to the outer cylinder 2, but the sealing member 6 is temporarily sealed to the upper inner periphery of the outer cylinder 2 (temporarily sealed sealing). The stop member 6 does not have a gap between the inner periphery of the outer cylinder 2 and the outer periphery of the outer cylinder 2, but can slide with respect to the outer cylinder 2 by an external force. Not yet processed.

The gas filling section 12 has a gas filling head 31, a vacuum head 32, and a caulking device 33. That is, the gas sealing section 12 has an elevating base 35 that can move up and down along a slide guide 34 provided on the front surface of the column 10A. The elevating base 35 can be moved up and down by an elevating cylinder 36. The vacuum head 32 is suspended and supported, and the above-described gas sealing head 31 is mounted around the vacuum head 32. Also,
The gas filling portion 12 is provided with a caulking device 3 on the front surface of the column 10A.
The crimping housing 37 of No. 3 is fixed, and the gas filling head 31 and the vacuum head 32 are arranged in the housing 37.

The gas filling head 31 includes a lifting cylinder 36
An outer cylinder 41 is hermetically sealed around an inner cylinder 51, which will be described later, of a vacuum head 32 suspended from a lifting base 35 which is lifted and lowered by the vacuum head 32.
Piston 4 fixed to the outer periphery of the inner cylinder 51
2 separates the upper air chamber 43A and the lower air chamber 43B into the outer cylinder 41, and a pneumatic supply path 45 connected to a pneumatic device 44 provided on the side of the elevating base 35 is built in the outer cylinder 41. The pneumatic supply passage 45 is connected to the upper air chamber 43.
A and the lower air chamber 43B can be switched and connected. The gas filling head 31 is moved downward while the hydraulic shock absorber support 11 sets the hydraulic shock absorber 1 to the gas filling work position and the vacuum head 32 presses and holds the end plate 7 of the hydraulic shock absorber 1 as described later. The air pressure is supplied to the air chamber 43B (the upper air chamber 43A is opened to the atmosphere), the air chamber 43B moves downward around the vacuum head 32, and the upper end of the outer cylinder 2 of the hydraulic shock absorber 1 can be held by the tip holding section 31A. At this time, the gas sealing head 31 causes the O-ring 46 on the inner periphery of the tip holding portion 31A to be in close contact with the outer periphery of the upper part of the outer cylinder 2, and the tip holding portion 31A
A step portion 31B provided on the inner periphery of the outer cylinder 2 against the upper end surface of the outer cylinder 2, and the inner peripheral surface of the outer cylinder 2 and the step portion 31 of the gas sealing head 31
The inner peripheral surface higher than B is flush with the inner peripheral surface (FIG. 4B).

The elevating base 35 that suspends and supports the vacuum head 32 is provided with a level gauge 47 such as a dial gauge (FIG. 4A).
The relative position of the gas filling head 31 with respect to 2 can be measured. The level meter 47 is in a state where the step 31B of the tip holding portion 31A of the gas filling head 31 hits the upper end surface of the outer cylinder 2 and the tip of the vacuum head 32 presses and holds the end plate 7 (FIG. 4B). , The amount of protrusion of the upper end of the outer cylinder 2 with respect to the end plate 7, that is, the crimping allowance H of the outer cylinder 2.
Can be measured.

Further, the gas filling head 31 has a built-in ventilation path 49 connected to a gas supply device 48 provided on the side of the lifting base 35. Accordingly, the gas supply head 48 supplies the gas supplied by the gas supply device 48 from the ventilation path 49 to the outer cylinder 2 with the vacuum head 32 pulling the sealing member 6 upward from the upper end of the outer cylinder 2 as described later. Top of 2,
As a result, an oil return path 8 drilled in the rod guide 5
Can be sealed in a gas chamber between the outer cylinder 2 and the inner cylinder 3.

As described above, the vacuum head 32 has the inner cylinder 51 suspended from the elevating base 35 which is raised and lowered by the elevating cylinder 36.
Is hermetically housed in an outer cylinder 41 of the gas filled head 31, and an outer guide 77 </ b> C of a chuck device 77 described later is hermetically inserted into the hollow inner diameter portion of the inner cylinder 51. The vacuum head 32 has a built-in cylinder 51 with a vacuum suction path 53 connected to a vacuum device 52 provided on the side of the lifting base 35. The vacuum head 32 uses the vacuum suction path 53 to apply a vacuum suction force to a space above the sealing member 6 temporarily sealed to the outer cylinder 2 of the hydraulic shock absorber 1, thereby causing the vacuum member 32 to end with the sealing member 6. The plate 7 is sucked upward, and the sealing member 6 is held above the upper end of the outer cylinder 2.
The gas filling head 31 is pulled up to a position higher than the open end of the ventilation path 49 on the inner peripheral surface, so that the gas filling head 31 can supply gas to the upper portion of the outer cylinder 2.

The vacuum head 32 is provided with a lifting cylinder 36
(A) lowers when pressing and holding the end plate 7 to measure the crimping margin of the outer cylinder 2, and (b) moves the sealing member 6 to the inner peripheral surface of the gas sealing head 31. (C) after the gas is sealed in the upper part of the outer cylinder 2, the sealing member 6
When the end plate 7 is pressed and held inside the outer cylinder 2 at a regular assembly position with respect to the upper end of the inner cylinder 3, it descends.

The caulking device 33 supports the revolving unit 61 via bearings on upper and lower support portions of a caulking housing 37 fixed to the front surface of the column 10A. The revolving body 61 is coaxially arranged with the gas filling head 31 and the vacuum head 32, and is driven by a belt by a revolving motor 62. 61A is a belt pulley. The revolving unit 61 rotatably supports three rollers 63 equally arranged in the circumferential direction via bearings, and rotates around the upper end of the outer cylinder 2 of the hydraulic shock absorber 1. The swing body 61
A cam member 64 is slid up and down by a fork 66 swung up and down by a cam elevating cylinder 65, and the cam surface 64 A of the cam member 64 is
3 is engaged with the third pin 63A, and each roller 63 moves from the original position to the upper end of the outer cylinder 2 by moving the cam member 64 up and down. The fork 66 is swung up and down around a swing fulcrum 67, and a cam follower 66A at the tip is
The cam member 64 is slidable up and down by engaging with the circumferential groove 66B on the outer periphery of the cam member 64.

In a state where each roller 63 is advanced to a position facing the upper end surface of the outer cylinder 2 and the revolving body 61 is rotated,
The clamp base 22 is provided by the clamp cylinder 23 described above.
Is raised to position the hydraulic shock absorber 1 at the caulking work position, and the upper end surface of the outer cylinder 2 is settled on the roller surface of each roller 63 to apply a predetermined caulking load to the upper end of the outer cylinder 2. The upper end of the cylinder 2 is deformed in the radial direction to form the upper end caulking portion 2A, and the sealing member 6 and the end plate 7 can be attached to the regular assembly position at the upper end of the inner cylinder 3.

The hydraulic shock absorber performance evaluation unit 13 includes a column 10
A lift guide 72 is provided on the front surface of A and can move up and down along slide guides 71. The lift head 72 is connected to a connecting rod 75 of a crank device 74 driven by a lift motor 73. The elevating head 72 has an automatic chucking device 77 (rod holding device) equipped with a load meter 76, and uses the chuck jaws 77 </ b> A, the inner guide 77 </ b> B, and the outer guide 77 </ b> C of the chucking device 77 as a vacuum inner diameter of the inner cylinder 51 of the vacuum head 32. Then, the screw surface of the chuck pawl 77A is screwed and held on the distal end thread portion of the piston rod 4 extending to the outside via the sealing member 6 of the hydraulic shock absorber 1. The chuck device 77 enables the chuck pawl 77A to expand and contract by the cooperation of the inner guide 77B and the outer guide 77C (FIG. 7B). Thus, the hydraulic shock absorber performance evaluation unit 13 drives the chuck device 77 up and down by the lifting motor 73 while the sealing member 6 of the hydraulic shock absorber 1 is attached to the proper assembly position, and Measure the gas reaction force, damping force, etc., and make performance evaluation possible.

Hereinafter, a procedure for using the assembling apparatus 10 will be described. (1) Setting of the hydraulic shock absorber 1 (FIG. 3) The hydraulic shock absorber 1 is filled with oil, the outer cylinder 2 is temporarily sealed with the sealing member 6 on the upper inner periphery, and the end plate 7 is temporarily mounted. The container 1 is carried into the clamp base 22 of the support portion 11 and is erected. The clamp base 22 is lifted by the clamp cylinder 23, and the upper part of the outer cylinder 2 of the hydraulic shock absorber 1 is inserted into the gas sealing part 12 and positioned at the gas sealing work position.

The vacuum head 32 is moved by the lift cylinder 36.
Is lowered, and the end plate 7 of the hydraulic shock absorber 1 is pressed and held by the tip of the vacuum head 32.

Air pressure is supplied to the lower air chamber 43B of the gas-sealed head 31 (the upper air chamber 43A is opened to the atmosphere), and the gas-sealed head 31 is lowered around the vacuum head 32. The upper part of the outer cylinder 2 is held. At this time, the gas filling head 31 is
The inner periphery of A is brought into close contact with the outer periphery of the upper part of the outer cylinder 2, and the stepped part 31 B provided on the inner periphery of the tip holding part 31 </ b> A is brought into contact with the upper end surface of the outer cylinder 2, and the inner peripheral surface of the outer cylinder 2 is filled with gas Head 3
The inner peripheral surface higher than the first step portion 31B is flush.

(2) Measurement of crimping allowance (FIG. 4) The state where the hydraulic shock absorber 1 is set by the above-mentioned (1) with the clamp base 22 of the support portion 11, the gas filling head 31 of the gas filling portion 12, and the vacuum head 32. Then, using the level meter 47, the crimping allowance H of the outer cylinder 2 which is a protruding amount of the upper end portion of the outer cylinder 2 with respect to the end plate 7 is measured, and the crimping allowance H falls within a predetermined value range. Is confirmed (determined).

As described above, the level meter 47 is configured such that the step 31B of the tip holding portion 31A of the gas filling head 31 is
The protrusion amount of the upper end of the outer cylinder 2 with respect to the end plate 7, that is, the crimping allowance H of the outer cylinder 2 is measured in a state where the distal end of the vacuum head 32 presses and holds the end plate 7.

(3) Filling of Gas (FIG. 5) The vacuum head 32 is raised by the lifting cylinder 36. The rising height is determined by setting the lower end of the sealing member 6, which is pushed up by the vacuum suction force of the vacuum head 32 described later, to the open end of the ventilation path 49 provided in the gas sealing head 31 to the inner peripheral surface of the gas sealing head 31. In order to position the vacuum head 32 higher than the level, the height of the vacuum head 32 is set so as not to interfere with the sealing member 6. At this time, the supply of air pressure from the air pressure supply path 45 of the vacuum head 32 to the lower air chamber 43B of the gas sealing head 31 is continued.
The gas filling head 31 still holds the upper end of the outer cylinder 2.

Using the vacuum suction path 53 of the vacuum head 32, a vacuum suction force is applied to the space above the sealing member 6 temporarily sealed to the outer cylinder 2 of the hydraulic shock absorber 1, and the sealing member 6 and the end The plate 7 is sucked upward, and the sealing member 6 is lifted above the upper end of the outer cylinder 2 to a position higher than the open end of the ventilation path 49 on the inner peripheral surface of the gas sealing head 31.

Subsequently, the ventilation path 49 of the gas filling head 31
The gas between the outer cylinder 2 and the inner cylinder 3 from the upper part of the outer cylinder 2 held by the tip holding part 31A of the gas filling head 31 and, consequently, from the oil return path 8 drilled in the rod guide 5 A gas (high-pressure gas such as nitrogen gas) is sealed in the chamber. When the filling gas pressure reaches a predetermined value by a gas pressure gauge or the like provided in the ventilation path 49 or the like, the filling is stopped.

After the gas is sealed in the upper part of the outer cylinder 2, the vacuum head 32 is lowered by the elevating cylinder 36, and the sealing member 6 and the end plate 7 are properly assembled inside the outer cylinder 2 with respect to the upper end of the inner cylinder 3. Press and hold in position.

In filling the gas, the vacuum head 3
2 pushes the sealing member 6 upward from the upper end of the outer cylinder 2 and then pushes the sealing member 6 down to a regular assembly position with respect to the upper end of the inner cylinder 3, but the sealing lip of the sealing member 6 is The outer peripheral surface is simply smoothly in contact with the outer peripheral surface without being scratched.

(4) Caulking of the hydraulic shock absorber 1 (FIG. 6) Air pressure is supplied to the upper air chamber 43A of the gas filling head 31 (the lower air chamber 43B is opened to the atmosphere), and the gas filling head 3 is opened.
1 is raised around the vacuum head 32, and the upper part of the outer cylinder 2 of the hydraulic shock absorber 1 is released to the rollers 63 of the caulking device 33.

A cam member 64 by a cam elevating cylinder 65
The roller 63 is advanced to a position where the roller 63 faces the upper end surface of the outer cylinder 2 by the lowering of
Is rotated, the clamp base 22 is lifted by the clamp cylinder 23, the hydraulic shock absorber 1 is raised to the caulking work position, and the upper end surface of the outer cylinder 2 is pressed against the roller surface of each roller 63. A predetermined caulking load is applied to the upper end of the inner cylinder 2 to deform the upper end of the outer cylinder 2 in the inner diameter direction to form an upper end caulking portion 2A. Attach to the assembly position. At this time, the vacuum head 32 is
The pressing load for pressing the sealing member 6 and the end plate 7 to the regular assembly position with respect to the upper end of the inner cylinder 3 is, for example, 800 kgf,
The caulking load applied to the upper end of the outer cylinder 2 by raising the clamp base 22 by the clamp cylinder 23 is, for example, 12
00 kgf.

After forming the upper end caulking portion 2A on the outer cylinder 2,
The clamp base 22 is lowered by the clamp cylinder 23 to position the hydraulic shock absorber 1 at the performance evaluation work position.
At the same time, the rotation of the revolving unit 61 is stopped, and each roller 63 is retracted to the original position.

(5) Performance Evaluation of Hydraulic Shock Absorber 1 When the gas filling described in (3) above is completed, the piston rod 4 of the hydraulic shock absorber 1 is pushed out, and the piston rod 4
Is pushed out, the chuck device 77 of the performance evaluation unit 13
Automatically chucks the tip of the piston rod 4.
The chuck device 77 is moved up and down by the up and down movement of the elevating head 72 by the elevating motor 73, and the piston rod 4
The gas reaction force and the damping force of the hydraulic shock absorber 1 are measured based on the expansion stroke and the output value of the load meter 7. The gas reaction force is measured from the output value (static output value) of the load meter 76 at each stroke of the hydraulic shock absorber 1 while the motor 73 is rotating at a low speed. The damping force is measured by subtracting the gas reaction force from the output value (dynamic output value) of the load cell 7 at each stroke of the hydraulic shock absorber 1 while the motor 73 is rotating at high speed.

When the performance of the hydraulic shock absorber 1 is evaluated, the expansion and contraction stroke of the piston rod 4 is set to the maximum stroke, whereby the air mixed in the oil in the oil chamber of the inner cylinder 3 is removed from the upper part of the rod guide 5. Consequently, the gas is exhausted from the oil return path 8 of the rod guide 5 to the gas chamber between the outer cylinder 2 and the inner cylinder 3.

Therefore, according to the present embodiment, the following operations are provided. In a state where the sealing member 6 is temporarily sealed to the outer cylinder 2 of the hydraulic shock absorber 1, the hydraulic shock absorber 1 is carried into the assembling apparatus 10, and the temporarily sealed sealing member 6 is attached to the outer cylinder 2 of the hydraulic shock absorber 1. A gas introduction passage to the hydraulic shock absorber 1 is formed by being pulled up from the upper end of the hydraulic shock absorber 1, a gas of a predetermined pressure is sealed in the hydraulic shock absorber 1 through the gas introduction passage, and after the gas is sealed, the sealing member 6 is moved to the outer cylinder. 2, the upper end of the inner cylinder 3 is attached to a regular assembly position.

As described above, in the process of transporting the hydraulic shock absorber 1 to the assembling apparatus 10, the hydraulic shock absorber 1 is not temporarily sealed by the sealing member 6 and there is no possibility of intrusion of foreign matter, and parts management can be simplified. it can.

In the above, the sealing member 6 is smoothly pulled up from the upper end of the outer cylinder 2 by the vacuum suction force of the vacuum head 32, or is pressed by the vacuum head 32 to the normal assembly position in the outer cylinder 2. The hydraulic shock absorber 1 can be held, and the assembly quality of the hydraulic shock absorber 1 can be improved without breaking the sealing lip of the sealing member 6.

The hydraulic shock absorber 1 is mounted in the assembling apparatus 10 after the sealing member 6 is attached to the proper assembling position, and subsequently, the piston rod 4 held by the chuck device 77 is moved up and down to thereby provide an oil pressure damper. The performance of the vessel 1, such as gas reaction force and damping force, can be evaluated.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design can be changed without departing from the scope of the present invention. The present invention is also included in the present invention.

[0048]

As described above, according to the present invention, it is possible to simplify the management of parts without invading foreign matter into the hydraulic shock absorber and damaging the sealing member in the process of assembling the hydraulic shock absorber. However, the assembly quality of the hydraulic shock absorber can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an assembling apparatus, wherein (A) is a front view and (B) is a side view.

FIG. 2 is a fragmentary front view of the essential part showing the hydraulic shock absorber;

FIG. 3 is a sectional view showing a hydraulic shock absorber set state of the assembling apparatus.

FIG. 4 is a sectional view showing a crimping margin measuring state of the assembling apparatus.

FIG. 5 is a cross-sectional view showing a gas filled state of the assembling apparatus.

FIG. 6 is a sectional view showing a crimped state of the assembling apparatus.

FIG. 7 is a sectional view showing a performance evaluation state of the assembling apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic shock absorber 2 Outer cylinder 3 Inner cylinder 4 Piston rod 6 Sealing member 10 Assembly device 31 Gas filling head 23 Vacuum head 33 Caulking device 49 Vent path 53 Vacuum suction path 77 Chuck device (Rod holding device)

Claims (3)

[Claims] 1. A method for assembling a hydraulic shock absorber, wherein an oil reservoir and a gas chamber above the oil reservoir are formed between the inner and outer cylinders of the hydraulic shock absorber, and an upper portion of the inner and outer cylinders is sealed with a sealing member. Filled with oil and holding the upper part of the outer cylinder of the hydraulic shock absorber in which a sealing member is temporarily sealed on the upper inner periphery of the outer cylinder, and having a ventilation path for sealing gas into the hydraulic shock absorber. A head and a vacuum suction path for applying a vacuum suction force to a space above the sealing member which is provided in the gas filling head and temporarily sealed to the hydraulic shock absorber, and the sealing member is provided inside the outer cylinder in the inner cylinder. A vacuum head that presses the upper end of the outer cylinder to a proper assembly position, and a caulking device that is disposed outside the hydraulic shock absorber and deforms the upper end of the outer cylinder in the inner diameter direction to attach the sealing member to the proper assembly position. The upper part of the outer cylinder of the hydraulic shock absorber is held by the gas filling head The sealing member temporarily sealed to the hydraulic shock absorber is pulled upward from the upper end of the outer cylinder by the vacuum suction force of the vacuum head, and a gas at a predetermined pressure is sealed in the hydraulic shock absorber from the air passage of the gas sealing head, The sealing member is pressed and held by the vacuum head at the regular assembly position at the upper end of the inner cylinder, the gas filling head is moved above the upper part of the outer cylinder, and the upper end of the outer cylinder is deformed in the inner diameter direction by the caulking device And mounting the sealing member at a proper assembly position. 2. An assembly device for a hydraulic shock absorber, wherein an oil reservoir and a gas chamber above the oil reservoir are formed between the inner and outer cylinders of the hydraulic shock absorber, and an upper portion of the inner and outer cylinders is sealed with a sealing member. Filled with oil and holding the upper part of the outer cylinder of the hydraulic shock absorber in which a sealing member is temporarily sealed on the upper inner periphery of the outer cylinder, and having a ventilation path for sealing gas into the hydraulic shock absorber. A head and a vacuum suction path for applying a vacuum suction force to a space above the sealing member which is provided in the gas filling head and temporarily sealed to the hydraulic shock absorber, and the sealing member is provided inside the outer cylinder in the inner cylinder. A vacuum head that presses the upper end of the outer cylinder to a proper assembly position, and a caulking device that is disposed outside the hydraulic shock absorber and deforms the upper end of the outer cylinder in the inner diameter direction to attach the sealing member to the proper assembly position. The upper part of the outer cylinder of the hydraulic shock absorber is held by the gas filling head, The temporarily sealed sealing member is pulled upward from the upper end of the outer cylinder by the vacuum suction force of the vacuum head, a gas of a predetermined pressure is sealed in the hydraulic shock absorber through the air passage of the gas sealing head, and sealed by the vacuum head. The member is pressed and held at a regular assembly position at the upper end of the inner cylinder, the gas filling head is moved upward from the upper part of the outer cylinder, and the upper end of the outer cylinder is deformed in the inner diameter direction by a caulking device to form a sealing member. A hydraulic shock absorber assembling apparatus, which can be attached to a regular assembling position. And a rod holding device for holding a piston rod extending outside through a sealing member of the hydraulic shock absorber, wherein the sealing member of the hydraulic shock absorber is attached to a regular assembly position. 3. The hydraulic shock absorber assembling device according to claim 2, wherein the rod holding device is driven up and down to evaluate the performance of the hydraulic shock absorber.