WO2000022320A1

WO2000022320A1 - Method and device for assembling hydraulic shock absorber

Info

Publication number: WO2000022320A1
Application number: PCT/JP1999/005641
Authority: WO
Inventors: Takaaki Yamaura
Original assignee: Showa Corporation
Priority date: 1998-10-14
Filing date: 1999-10-13
Publication date: 2000-04-20
Also published as: GB2346947B; JP2000120754A; GB2346947A; JP4100783B2; ID26133A; CN1109204C; GB0014175D0; BR9906872A; CN1287599A

Abstract

An assembling device (10) for a hydraulic shock absorber (1), wherein the top part of an outer tube (2) of the hydraulic shock absorber (1) is held by a gas-sealed head (31), a sealing member (6) temporarily attached sealingly to the hydraulic shock absorber (1) is pushed upward above the upper end of the outer tube (2) by a vacuum sucking force of a vacuum head (32), the gas of a specified pressure is sealed into the hydraulic shock absorber (1) through a gas feed path (49) in the gas-sealed head (31), the sealing member (6) is held pressingly on an inner tube (3) at an upper end regular assembly position by the vacuum head (32), the gas-sealed head (31) is moved upward from the upper part of the outer tube (2), and the upper end of the outer tube (2) is deformed in inner radial direction by a caulking device (33) so as to install the sealing member (6) at the regular assembly position.

Description

Description Assembly method and device for hydraulic shock absorber

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

Conventionally, an oil sump chamber and a gas chamber are formed between the inner and outer cylinders of a hydraulic shock absorber, and 內 As a method of assembling a hydraulic shock absorber in which the upper part of the outer sleeve is sealed with a sealing member, Japanese Patent Laid-Open Publication No. ^ (Prior art 1) and those described in JP-B-61-16839 (prior art 2).

Prior art 1 incorporates a sealing member with a gap in the upper inner periphery of the outer cylinder of the hydraulic shock absorber, and seals the gas at a predetermined pressure supplied by the gas filling head with the upper inner periphery of the outer cylinder. It is sealed in the hydraulic shock absorber through the gap between the members, and then the upper part 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 that is properly sealed on the upper inner periphery of the outer cylinder of the hydraulic shock absorber, and the sealing lip is spread in the right direction with this jig. A gas introduction passage 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 sealed gas is sealed by the restoring force of the sealing lip. 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 a process of transporting the hydraulic shock absorber to the assembling apparatus, and the like. There is a possibility that foreign matter may enter the inside of the container, and there is a disadvantage that it is necessary to provide a cover for closing the gap.

Further, in the prior art 2, when the sealing lip of the sealing material that is properly sealed to the hydraulic shock absorber is spread by a jig, the sealing lip of the sealing member may be scratched, and quality may be impaired. —

There is. Disclosure of the invention

An object of the present invention is to assemble a hydraulic shock absorber while simplifying parts without causing foreign matter to enter the inside of the hydraulic shock absorber during the assembly process of the hydraulic shock absorber, and without damaging the sealing member. Is to make it good.

The present invention relates to a method of assembling a hydraulic shock absorber in which an oil reservoir and a gas chamber above the oil sump are formed between the inner and outer cylinders of the hydraulic shock absorber, and the upper part of the inner and outer cylinders is sealed with a sealing member. Filling the oil, holding the upper part of the outer cylinder of the hydraulic shock absorber in which a sealing member is temporarily sealed on the inner periphery of the upper part of the outer cylinder, and filling the hydraulic shock absorber with a gas passage provided with a ventilation path for sealing gas. And a vacuum suction path that applies a vacuum suction force to the space above the seal され, which is mounted inside the gas filling head and is temporarily sealed to the hydraulic shock absorber, and seals ¾1¾ inside the outer cylinder. A vacuum head that presses the upper end of the cylinder to the 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. Using the assembling equipment provided, the gas filling head is used on the outer cylinder of the hydraulic shock absorber. , 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 is passed from the air passage of the gas filled head to the hydraulic shock absorber. A gas at a predetermined pressure is charged, the sealing member is pressed and held by a vacuum head at a regular assembling position at the upper end of the inner cylinder, and the gas sealing head is moved upward from the upper portion of the outer cylinder, and a caulking device is used. Thus, the upper end of the outer cylinder is deformed in the inner diameter direction so that the sealing member is mounted at a proper assembly position.

The present invention is also an assembly apparatus for a hydraulic shock absorber, wherein an oil reservoir and a gas chamber above the oil sump are formed between the outer cylinder and the outer cylinder of the hydraulic shock absorber, and the upper part of the inner and outer cylinders is sealed with a sealing member. The impulse is filled with oil, the upper part of the outer cylinder of the hydraulic shock absorber having a sealing member temporarily sealed on the inner periphery of the upper part of the outer cylinder is held, and the hydraulic shock absorber is provided with an air passage for sealing gas. A gas filling head, and a sealing part that is installed inside the gas filling head and is temporarily sealed to a hydraulic shock absorber. Vacuum suction in the space above the material [A vacuum suction path that exerts a force is provided, and a vacuum head that presses the seal inside the outer cylinder to the proper assembly position at the upper end of the inner cylinder, and placed outside the hydraulic shock absorber And a crimping device for deforming the upper end of the outer cylinder in the inner diameter direction to attach the sealing member to a proper assembling position. The upper end of the outer cylinder of the hydraulic shock absorber is held by a gas-filled 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 gas of a predetermined pressure is sealed in the hydraulic shock absorber through the air passage of the gas sealing head. Then, the sealing member is pressed and held by the vacuum head at the proper assembling 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 outer cylinder is moved by the caulking device. The sealing member can be attached to the regular assembly position by deforming the upper end in the inner diameter direction. In which was to so that. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic view showing an assembling apparatus, in which (Α) is a front view and (Β) is a side view.

FIG. 2 is a fragmentary front view showing a hydraulic shock absorber.

FIG. 3 is a cross-sectional view showing a state where the hydraulic shock absorber is set in the assembling apparatus.

FIG. 4 is a 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.

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

mi is a cross-sectional view showing the performance evaluation state of the assembly apparatus. BEST MODE FOR CARRYING OUT THE INVENTION

In the assembling apparatus 10 of 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 an outer cylinder 2 having a bottomed cylindrical shape, and a piston rod 4 is slidably inserted into the inner cylinder 3. At the upper end of the inner cylinder 3, a rod guide 5, a sealing member (oil seal) 6, and an end plate 7 are attached. 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 the 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 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 above-mentioned seal 6. The hydraulic shock absorber 1 is provided with an oil return passage 8 in the rod guide 5 to seal 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 sealing lip of FIG. 6 removes the dropped oil, and the dropped oil can be returned to the oil reservoir between the outer cylinder 2 and the inner cylinder 3 from the oil return path 8.

The assembling apparatus 10 includes a hydraulic shock absorber support section 11, a gas filling section 12, and a hydraulic shock absorber performance evaluation section 13 in a column 1OA.

The hydraulic shock absorber support 11 has a clamp base 22 that can move up and down along a slide guide 21 provided on the front of the column 10 A. The clamp base 22 can be moved up and down by a clamp cylinder 23. The hydraulic shock absorber 1, which is supported upright on the clamp base 22, can be set to the gas filling work position where the upper part of the outer cylinder 2 is filled in the gas filling part 12. At this time, although the hydraulic shock absorber 1 has the rod guide 5 press-fitted and fixed to the outer cylinder 2, the sealing member 6 is temporarily sealed to the upper inner periphery of the outer cylinder 2 (temporarily sealed sealing). The stop member 6 has no gap between the inner periphery of the outer cylinder 2 and the outer periphery of the outer cylinder 2 so that foreign matter can enter, but can slide with respect to the outer cylinder 2 by an external force.) 2 A is not yet processed.

The gas filling section 12 includes a gas filling head 31, a vacuum head 32, and a caulking device 33. That is, the gas filling section 12 has a lifting base 35 that can move up and down along a slide guide 34 provided on the front of the column 1 OA, and the lifting base 35 is moved up and down by a lifting cylinder 36. The above-mentioned vacuum head 32 is suspended and supported on the lifting base 35, and the above-mentioned gas-filled head 31 is mounted around the vacuum head 32. Also, the gas filling section 12 is caulked to the front of the column 1 OA. The crimping housing 37 of the device 33 is fixed, and the gas-filled head 31 and the vacuum head 32 are arranged in the housing 37.

The gas-filled head 31 is air-tightly mounted around an inner cylinder 51, which will be described later, of a vacuum head 32 suspended from a lifting base 35 raised and lowered by a lifting cylinder 36. The outer cylinder 41 has an upper air chamber 43A and a lower air chamber 43B by a piston 42 fixed to the outer circumference of the inner cylinder 51 of the vacuum head 32. 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, and the ¾JE supply path 4

The air chamber 43A and the lower air chamber 43B can be switched and connected. In the gas filling head 31, the hydraulic shock absorber support 11 sets the hydraulic shock absorber 1 to the gas filling work position, and the vacuum head 32 moves the end plate 7 of the hydraulic shock absorber 1 as described later. In the state of holding by pressing, the air pressure is supplied to the lower air chamber 43B (the upper air chamber 43A is open to the atmosphere), moved downward around the vacuum head 32, and oiled by the tip holding part 31A. The upper part of the outer cylinder 2 of the container 1 can be held. At this time, the gas filling head 31 is brought into close contact with the O-ring 46 on the inner periphery of the distal end holding portion 31A and the upper outer periphery of the outer cylinder 2 and the step provided on the inner periphery of the distal end holding portion 31A. Part 3 1B is brought into contact with the upper end surface of the outer cylinder 2, and the inner peripheral surface of the outer cylinder 2 and the inner peripheral surface higher than the stepped portion 31B of the gas filling head 31 are flush (Fig. 4 (B )).

The elevating base 35, which suspends and supports the vacuum head 32, is provided with a level gauge 47 such as a dial gauge (Fig. 4 (A)), and the level gauge 47 is attached to the vacuum head 32. The relative position of the gas-filled head 31 with respect to the gas can be measured. In the level meter 47, the tip holding part 31 of the gas-filled head 31 1 has a stepped part 31A of 3A against the upper end surface of the outer cylinder 2, and the tip of the vacuum head 32 presses the end plate 7. In the holding state (FIG. 4 (B)), 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.

In addition, the gas filling head 31 is provided with a gas supply device 4 8 provided on the side of the lifting base 35. It has an air passage 49 connected to it. As a result, the gas filling head 31 sends the gas supplied by the gas supply device 48 with the vacuum head 32 pulling the sealing member 6 upward from the upper end of the outer cylinder 2 as described later. Can be filled in the gas chamber between the outer cylinder 2 and the inner cylinder 3 from the oil return path 8 drilled in the rod guide 5 from the ventilation path 49 to the upper part of the outer cylinder 2.

As described above, the vacuum head 32 has an internal cylinder 51 suspended from a lifting base 35 raised and lowered by an elevating cylinder 36, and this internal cylinder 51 is sealed with a gas-sealed head. The outer cylinder 41 is airtightly mounted inside the outer cylinder 41, and an outer guide 77C of a chuck device 77 described later is airtightly inserted into the hollow inner diameter of the inner cylinder 51. The vacuum head 32 has a built-in cylinder 51 having 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 the space above the sealing member 6 temporarily sealed to the outer cylinder 2 of the hydraulic shock absorber 1 to form the sealing 6. The end plate 7 is sucked upward, and the sealing member 6 is pulled up above the upper end of the outer rim 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 to fill the gas. The gas can be supplied to the upper part of the outer cylinder 2 by the head 31.

The vacuum head 32 is moved up and down by the elevating cylinder 36 as described above. (A) When the end plate 7 is pressed and held for measuring the crimping allowance of the outer cylinder 2, the vacuum head 32 is lowered. The stopper 6 is raised before the gas filling head 3 1 is raised above the open end of the ventilation path 49 on the inner peripheral surface of the gasket 31, and (c) the sealing member is filled after gas is filled into the upper part of the outer cylinder 2. 6. Lowers when the end plate 7 is pressed and held inside the outer cylinder 2 at the proper assembly position with respect to the upper end of the inner cylinder 3.

The caulking device 33 supports the revolving unit 61 via bearings on upper and lower support portions of a hoofing housing 37 fixed to the front of the column 1 OA. The revolving unit 61 is coaxially arranged with the gas filling head 31 and the vacuum head 32, and is belted β by the revolving motor 62. 6 1 Α is a belt pulley. Revolving body 6 1 is equally distributed in the circumferential direction 3 The rollers 63 are rotatably supported via bearings, and rotate around the upper end of the outer cylinder 2 of the hydraulic shock absorber 1. The revolving unit 61 has a cam member 64 that is slid up and down by a fork 66 that is swung up and down by a cam elevating cylinder 65, and the cam surface 64 a of the force member 64 is attached to each roller 6. The third pin 6 3 A is engaged, and each roller 63 is moved forward and backward from the original position to the upper end of the outer cylinder 2 by the vertical movement of the cam member 64. The fork 66 is swung up and down around the swing fulcrum 67, the cam follower 66A at the tip is engaged with the orbiting groove 66B on the outer periphery of the cam member 64, and the cam member 64 is moved up and down. It is possible to slide to

While the rollers 63 are advanced to positions facing the upper end surface of the outer cylinder 2 and the revolving unit 61 is rotated, the clamp base 22 is raised by the above-described clamp cylinder 23 and the hydraulic shock absorber is raised. Position 1 in the caulking work position, and

6 Settles on the roller surface of 3, causing a predetermined caulking load to act on the upper end of the outer cylinder 2, deforming the upper end of the outer cylinder 2 in the inner diameter direction to form the upper end caulking portion 2A, and sealing. The 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 has a lifting head 72 that can move up and down along the slide guides 71 and 71 provided on the front of the column 1 OA. It is connected to a connecting rod 75 of a driven crank device 74. The elevating head 72 has an automatic chuck device 77 (rod holding) equipped with a load cell 76. The chuck jaws 77 A, the inner guide 77 B, and the outer guide of the chuck device 77 are provided.

7 Insert 7 C into the vacuum inner diameter of the inner cylinder 51 of the vacuum head 32, and attach it to the tip thread of the piston rod 4 that extends outside via the sealing member 6 of the hydraulic shock absorber 1. Claws 7 Hold the 7 A threaded surface by screwing. In the chuck device 77, the chuck pawl 77A can be expanded and contracted by the cooperation of the inner guide 77B and the outer guide 77C (FIG. 7 (B)). As a result, the hydraulic shock absorber performance evaluation section 13 performs the lifting / lowering mode 73 with the sealing member 6 of the oil thigh impactor 1 attached to the proper assembly position. The chuck device 7 is driven up and down to measure the gas reaction force, damping force, etc. of the hydraulic shock absorber 1 to enable performance evaluation.

Hereinafter, a procedure for using the assembling apparatus 10 will be described.

(1) Set of hydraulic shock absorber 1 (Fig. 3)

The hydraulic shock absorber 1 is filled with oil, the outer cylinder 2 is also temporarily sealed with a sealing member 6 on the upper inner periphery, and the hydraulic shock absorber 1 with the end plate 7 temporarily mounted thereon is supported by the clamp base 2 of the support portion 1 1. Carry in 2 and make it stand upright. The clamp base 22 is raised 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 filling portion 12 to be positioned at the gas filling work position.

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

Supply air pressure to the lower air chamber 4 3 Β of the gas filled head 3 1 (open the upper air chamber 4 3 大気 to the atmosphere) and lower the gas filled head 3 1 around the vacuum head 3 2. The upper end of the outer cylinder 2 of the hydraulic shock absorber 1 is held by the tip holder 31A. At this time, the gas-filled head 31 is brought into close contact with the inner periphery of the tip holder 31 A at the upper periphery of the outer cylinder 2 and the step 31 provided on the inner periphery of the tip holder 31 A. B is applied to the upper end surface of the outer cylinder 2, and the inner peripheral surface of the outer cylinder 2 and the inner peripheral surface higher than the stepped portion 3 1 B of the gas-filled head 31 are flush.

(2) Measurement of crimping allowance (Fig. 4)

With the hydraulic shock absorber 1 set as described in (1) above with the clamp base 2 2 of the support 1 1 and the gas filling head 3 1 of the gas filling Then, measure the amount of crimping H of the outer cylinder 2 which is the amount of protrusion of the upper end of the outer cylinder 2 from the end plate 7 and confirm that the crimping allowance H is within a predetermined value range (determined. I do.

As described above, the level meter 47 has the tip holding portion 31 of the gas-filled head 3 1, the step portion 3 1 A of 3 A hits the upper end surface of the outer cylinder 2, and the tip of the vacuum head 3 2 End play In a state where the torsion is pressed and held, the amount of protrusion of the upper end of the outer cylinder 2 with respect to the end plate 7, that is, the crimping margin of the outer cylinder 2 is measured.

(3) Gas filling (Fig. 5)

The vacuum head 32 is raised by the lifting cylinder 36. The height of this rise is such that the lower end of the sealing member 6 pushed up by the vacuum suction force of the vacuum head 32 described later is connected to the gas filling head of the gas passage 49 provided in the gas filling head 31. When positioning the vacuum head 31 at a position higher than the level of the open end with respect to the inner peripheral surface thereof, the tip of the vacuum head 32 should have a height that does not interfere with the sealing member 6. At this time, the supply of air pressure from the air pressure supply passage 45 of the vacuum head 32 to the lower air chamber 43 of the gas filling head 31 continues, so that the gas filling head 31 is an outer cylinder. Hold the top of 2 still.

Vacuum suction I force is applied to the space above the sealing member 6 that is temporarily sealed to the outer cylinder 2 of the hydraulic shock absorber 1 using the vacuum suction path 53 of the vacuum head 3 2 to seal ^ The suction member 6 and the end plate 7 are 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 passage 49 on the peripheral surface of the gas filling head 31.

Subsequently, using the air passage 49 of the gas-filled head 31, the upper part of the outer cylinder 2 held by the front end holding portion 3 1 の of the gas-filled head 3 1, and eventually to the rod guide 5. A gas (high-pressure gas such as nitrogen gas) is filled in the gas chamber between the outer cylinder 2 and the inner cylinder 3 from the drilled oil return path 8. When the pressure of the sealing gas reaches a predetermined value by a gas pressure gauge or the like provided in the ventilation path 49 or the like, the sealing is stopped.

After filling the gas into 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 fixed to the upper end of the inner cylinder 3 inside the outer cylinder 2. Press and hold in the assembly position.

At the time of filling the gas, the vacuum head 32 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 proper assembly position with respect to the upper end of the inner cylinder 3. The sealing lip of the stop member 6 simply covers the outer peripheral surface of the piston rod 4. It slides smoothly and does not scratch.

(4) Crimping of hydraulic shock absorber 1 (Fig. 6)

Supply air pressure to the upper air chamber 43A of the gas-filled head 3 1 (open the lower air chamber 43B to the atmosphere), and raise the gas-filled head 31 around the vacuum head 32. 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 state in which the rollers 63 are advanced to positions facing the upper end surface of the outer cylinder 2 by the lowering of the force member 64 by the cam lifting cylinder 65, and the rotating body 61 is rotated by the rotating motor 62. Raise the clamp base 22 with the clamp cylinder 23 to raise the hydraulic shock absorber 1 to the caulking work position, and press the upper end surface of the outer cylinder 2 against the roller surface of each roller 6 3. A predetermined caulking load is applied to the upper end, and the upper end of the outer cylinder 2 is deformed in the inner diameter direction to form an upper end caulking portion 2A, and the sealing member 6 and the end plate 7 are fixed to the upper end of the inner cylinder 3 Attach to the assembly position. At this time, the pressing load for pressing the sealing member 6 and the end plate 7 with the vacuum cylinder 32 to the regular assembly position with respect to the upper end of the inner cylinder 3 by the lifting cylinder 36 is, for example, 800 kgf, and the clamp base 22 by the clamp cylinder 23. Is raised to act on the upper end of the outer cylinder 2. The caulking load is, for example, 1200 kgi.

After forming the upper end caulking portion 2A in 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 when the piston rod 4 is pushed out, the chuck device 77 of the performance evaluation unit 13 is moved to the tip of the piston rod 4. Automatically chuck parts. Then, the chucking device 77 moves up and down by the up and down movement of the lifting head 72 by the lifting and lowering module 73, and the gas of the hydraulic shock absorber 1 is obtained by the expansion and contraction stroke of the piston rod 4 and the output value of the load meter 7. Measure the reaction force and damping force. The gas reaction force depends on the oil It is measured from the output value (static output value) of the load cell 76 at each stroke of the pressure buffer 1. 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 under high-speed rotation of motor 73.

The expansion stroke of the piston rod 4 during the performance evaluation of the hydraulic shock absorber 1 was set to the maximum stroke, whereby the air mixed in the oil in the oil chamber of the inner cylinder 3 was removed from the upper part of the rod guide 5, Eventually, 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.

① With the sealing member 6 temporarily sealed to the outer cylinder 2 of the hydraulic shock absorber 1, the hydraulic shock absorber 1 is carried into the assembling device 10, and the temporarily sealed sealing member 6 is removed from the hydraulic shock absorber 1. By pulling up from the upper end of the outer cylinder 2 to form a gas introduction passage to the hydraulic shock absorber 1, a gas at a predetermined pressure is sealed into the hydraulic shock absorber 1 through this gas introduction passage, and after sealing the gas, a sealing member is formed. 6 is attached to the upper end of the inner cylinder 3 in the outer cylinder 2 at a regular assembly position.

(2) According to (1) above, in the process of transporting the hydraulic shock absorber 1 to the assembling apparatus 10, the hydraulic shock absorber 1 is temporarily sealed by the sealing member 6 and there is no risk of intrusion of foreign matter, and parts management is simplified. it can.

(3) In (1) above, the sealing member (6) is pulled up smoothly 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. The assembly quality of the hydraulic shock absorber 1 can be improved without breaking the sealing lip of the sealing member 6.

④ After installing the sealing member 6 at the regular assembly position in the assembly device 10, the hydraulic shock absorber 1 then raises and lowers the hydraulic pressure by moving the piston rod 4 held by the chuck device 7 up and down. The performance of the shock absorber 1 such as gas reaction force and damping force can be evaluated.

As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to the embodiments, and there may be a design change or the like without departing from the gist of the present invention. This is also included in the present invention. Industrial applicability

ADVANTAGE OF THE INVENTION As mentioned above, according to this invention, a hydraulic shock absorber which simplifies parts management, without invading a foreign substance inside a hydraulic shock absorber and damaging a sealing member in the process of assembling a hydraulic shock absorber. Can have good assembly quality.

Claims

The scope of the claims

(1) A method for assembling a hydraulic shock absorber in which an oil sump chamber and a gas chamber above the oil sump chamber are formed between the inner and outer cylinders of the hydraulic shock absorber and the upper part of the inner and outer cylinders is sealed with a sealing member,

The hydraulic shock absorber is filled with oil, and the upper part of the outer cylinder of the hydraulic shock absorber, in which a sealing member is temporarily sealed on the inner periphery of the upper part of the outer cylinder, is held, and an air passage for filling gas into the hydraulic shock absorber is provided. The gas filling head is provided with a vacuum suction path for applying a vacuum suction force to the space above the sealing member, which is housed in the gas filling head and temporarily sealed to the oil JE impactor. A vacuum head that presses the upper end of the inner cylinder in the outer cylinder to the proper assembly position, and a vacuum head that is located 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 proper assembly position Using an assembling device having a caulking device attached to the

The upper part of the outer cylinder of the hydraulic shock absorber is held by the gas filling head, 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. A gas at a predetermined pressure is filled in the hydraulic shock absorber from the air passage of the gas filling head, and the sealing member is pressed and held at a regular assembly position at the upper end of the inner cylinder by a vacuum head. A method of assembling a hydraulic shock absorber, comprising: moving an upper end of an outer cylinder upward from an upper portion of an outer cylinder, deforming an upper end of the outer cylinder in an inner diameter direction by a caulking device, and mounting a sealing member at a proper assembly position.

(2) A hydraulic shock absorber assembly device in which 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 part of the inner and outer cylinders is sealed with a sealing member,

The hydraulic shock absorber is filled with oil, and the upper part of the outer cylinder of the hydraulic shock absorber, in which a sealing member is temporarily sealed on the inner periphery of the upper part of the outer cylinder, is held, and an air passage for filling gas into the hydraulic shock absorber is provided. Equipped with a gas filling head, and a vacuum suction path for applying a vacuum suction force to the space above the sealing member, which is mounted inside the gas filling head and temporarily sealed to the oil impulse device, and removes the sealing member. A vacuum head that presses the upper end of the inner cylinder in the cylinder to the proper assembly position, A caulking device which is arranged outside the impulse and deforms the upper end of the outer cylinder in the inner diameter direction to attach the sealing member to a regular assembly position,

The upper part of the outer cylinder of the hydraulic shock absorber is held by the gas filling head, and the sealing member temporarily sealed to the hydraulic shock absorber is pulled up from the upper end of the outer cylinder by the vacuum suction force of the vacuum head. A gas at a predetermined pressure is filled in the hydraulic shock absorber from the air passage of the gas filling head, and the sealing member is pressed and held at a regular assembly position at the upper end of the inner cylinder by a vacuum head. The upper end of the outer cylinder is deformed in the inner diameter direction by a caulking device, so that the sealing member can be attached to a regular assembling position. apparatus.

(3) A rod holding device for holding a piston rod extending to the outside via a sealing member of the hydraulic shock absorber, wherein the rod is mounted in a state where the sealing member of the hydraulic shock absorber is mounted at a regular assembly position. 3. The hydraulic shock absorber assembling device according to claim 2, wherein the holding device is driven up and down so that the performance of the hydraulic shock absorber can be evaluated.