JP2001012529A - Manufacture of shock absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture an absorber with an excellent productivity. SOLUTION: A shock absorber comprising a piston device for receiving a piston rod where impact force is applied and a housing for forming an annular space outside a piston cylinder and having working fluid sealed by communicating each piston chamber and the annular space is manufactured. A housing member 15B formed with an inner flange 63 at one end of a cut metallic tube by press working is chucked in a housing holder of an assembling device with the flange formed side being a lower end, and a first plug block which closes the lower end side and in which the piston 12 rod slides, the piston device, and a second plug block 34 for closing an upper end side are sequentially inserted and set. The housing member 15B is then formed with an inner flange at the upper end by press working and the second plug block is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a piston cylinder type shock absorber and a manufacturing apparatus used for the method.

[0002] Here, a shock absorber is one that can be used for absorbing various impacts and that can be applied to various robots, press machines, transfer machines, door opening and closing sections, and the like.

[0003]

2. Description of the Related Art As a piston cylinder type shock absorber, there is one having a configuration as shown in FIGS.

A piston device 14 incorporating a piston rod 12 receiving an impact force, and a piston cylinder (inner cylinder)
Accumulator holding space (annular space) 1 outside 16
And a housing (outer cylinder) 15 forming the same.
The piston cylinder 16 includes a first piston chamber 22 on the side of the piston rod 12 with the piston 20 interposed therebetween, and a second piston chamber 24 on the opposite side.

The accumulator holding space 18 is provided with a variable volume accumulator 21. The accumulator 21 complements the increase / decrease of the volume occupied by the piston rod 12 due to the entry / retreat of the piston rod 12 into the first piston chamber 22.

[0006] The first and second piston chambers 22, 24 and the accumulator holding space 18 are provided with a hydraulic fluid (usually hydraulic oil).
The second piston chamber 24 is provided with a piston return means (coil spring) 28. Further, the peripheral wall of the piston cylinder 16 is provided with a conduction hole 29 on the first piston chamber 22 side and an orifice 30 for shock absorption on the second piston chamber 24 side.

The accumulator 21 is formed of a ring as shown in the figure, which is a substantially closed-cell elastomer foam. At this time, in order to secure a large accumulator function, the ring body 21 is normally fitted almost closely to the accumulator holding space (annular space) 18.

A first plug block 32 for closing both ends of the housing 14 and holding the cylinder 16 is provided.
And the second plug block 34 is fitted. The plug blocks 32, 34 are locked (fixed) by first and second retaining ring plates 36, 38 made of spring steel.

The first plug block 32 for closing the piston rod side comprises a cylinder seat plate block 40 and a plug block main body 41 from the viewpoint of ease of assembly in the illustrated example. The cylinder seat plate block 40 includes a stopper step 42 that fits into the cylinder 16 and regulates the front dead center of the piston rod 12. Naturally, the first plug block 32
A through hole 32a in which the piston rod 12 slides is provided at the center, and first and second O-rings 48 and 50 are mounted on the inner peripheral side and the outer peripheral side, respectively, so that oil leakage on the piston rod 12 side can be prevented. Is secured.

On the other hand, the second plug block 34 has an oil supply hole 52 at the center. And oil supply hole 5
The second plug 2 can be closed by a screw plug 56, and a third O-ring 58 is attached to the outer peripheral side of the second plug block 34, so as to secure airtightness that can prevent oil leakage on the side opposite to the piston rod 12.

In the shock absorber having the above structure, when an impact load acts on the piston rod 12, the piston 20 pressurizes the hydraulic fluid L in the second piston chamber 24, and the hydraulic fluid L
Jets from the orifice 30 into the accumulator holding space 18. At this time, the hydraulic fluid L receives the resistance and generates heat due to the resistance, but the heat energy is radiated from the outer periphery of the housing. In this way, the impact energy (kinetic energy) is converted into heat energy to absorb the impact.

Conversely, the piston rod 12 from which the impact load has been removed returns by the piston 20 being urged by the coil spring 28 to prepare for the next impact.

[0013] The absorption capacity of the shock absorber having the above structure is determined by the characteristics of the hydraulic fluid (mainly viscosity), the orifice 3
It is controlled by the specification (dimensions / number) of 0 and the spring constant of the return coil spring 28.

However, in the case of the shock absorber having the above structure, since the pressure receiving surface of the accumulator 21 is substantially only the end face of the ring body, the volume compression (decrease) / elastic return (return) speed of the accumulator 21 is reduced by the piston rod. May not be able to follow the increase / decrease of the occupied volume of the vehicle.

That is, the volume reduction rate cannot compensate for the decrease in the entire working fluid filled space (the first and second piston chambers 22, 24 and the accumulator holding space 18) due to the increase in the volume occupied by the piston rod. There is a possibility that the working fluid ejected from the orifice 30 temporarily receives a back pressure, and the piston rod 12 is temporarily impacted.

Conversely, when the volume recovery speed of the accumulator 21 is low, the pressure in the accumulator holding space 18 tends to decrease, and the difference between the accumulator holding space 18 and the second piston chamber 24 due to the return of the piston rod tends to be small. As a result, the hydraulic fluid from the first piston chamber 22 to the second piston chamber 24 via the accumulator holding space 18 does not flow smoothly, and the return of the piston rod 18 due to the spring force is hindered, making it difficult to perform the operation quickly. Become.

[0017] The shock absorber having the above-described structure includes:
The housing (outer cylinder) 15 is generally manufactured by cutting.

In order to solve the above-mentioned problems, a patent application filed by the same person as the present applicant: Japanese Patent Application No. 11-027891 (February 4, 1999: unpublished at the time of filing)
Patent Documents 1 to 5 disclose a shock absorber. The details will be described below.

For the same parts as in the above-mentioned example (known example),
The same reference numerals are given and all or part of the description is omitted.

A piston device 14 incorporating a piston rod 12 which receives an impact force, and a housing 15 forming an accumulator holding space 18 outside a piston cylinder 16 are provided. The piston cylinder 16 includes a first piston chamber 22 on the side of the piston rod 12 with the piston 20 interposed therebetween, and a second piston chamber 24 on the opposite side.

Accumulator holding space (annular space) 1
8 is provided with a variable volume accumulator 21A. The accumulator 21 </ b> A complements the increase / decrease of the volume occupied by the piston rod 12 due to the penetration / retreat of the piston rod 12 into the first piston chamber 22.

The first and second piston chambers 22 and 24 and the accumulator holding space 18 contain a hydraulic fluid (usually hydraulic fluid).
The second piston chamber 24 is provided with a piston return means (coil spring) 28. Further, the peripheral wall of the piston cylinder 16 is provided with a conduction hole 29 on the first piston chamber 22 side and an orifice 30 for shock absorption on the second piston chamber 24 side. Up to this point, the configuration is substantially the same as the configuration of the above-described example. The hydraulic fluid is usually oil,
It may be water or other viscous fluid.

The present embodiment is different from the above-mentioned example, which is not indispensable, in that the housing 15A is formed of a pipe and the outer beading 60 is formed for mounting or positioning on a bracket or the like. It is a point.

The outer bead dig 60 may be provided at a plurality of positions at positions where the sealing performance is not impaired, that is, at positions other than the positions where the second and third O-rings 50 and 58 are mounted. By using a metal pipe such as an electric resistance welded pipe or a seamless pipe as a material, the first and second plug blocks 32 and 34 can be used.
Can be fixed by plastic working (heming or swaging: inner flange press working) 62, 63 at both ends, and compared with the case where the housing 14 is formed by cutting, not only the number of working steps but also the stopping at both ends are reduced. Ring plate 3
6 and 39 become unnecessary, leading to a reduction in the number of parts. Of course, the housing may be formed by cutting as in the conventional case. In the case of using an outer peripheral screw or an inner peripheral screw structure, it is usually formed by cutting.

In the present embodiment, the accumulator 21A is formed of a spirally wound elastomer string 66 with a gap between the outer periphery and the opposing surface.

Specifically, the elastomeric string body uses an elastomeric tube body, and the tube is fixedly bonded to the outer peripheral surface of the cylinder. In addition, both ends of the tube body are closed, and the contact surfaces of the spiral winding itself may be in an adhesive state. However, in the non-adhesive state, the contact surfaces are also auxiliary pressure receiving surfaces, and the volume of the accumulator is reduced. The rate of decrease is more desirable.

In this embodiment, from the viewpoint of assemblability and the like, an elastomer tube body 66 is used as the accumulator 21A, and the outer periphery and the inner periphery of the spirally wound body are formed into a corrugated cross section. Although it is made easy to operate, it may be formed by an aggregate in which a plurality of rings are connected. Further, when the mutual contact surfaces of the spiral winding itself or the plurality of ring bodies are not bonded, the cross section of each of the elastomer string body 66 or the plurality of ring bodies (not shown) may be rectangular.

Although the number of accumulators is two, one accumulator may be used as in the prior art, depending on the required capacity.
The material for forming the elastomeric string or the plurality of elastic rings is preferably a tube made of silicone rubber, fluorine rubber, NBR or the like. Is also good.

In this embodiment, the accumulator 21A
Is disposed in contact with the outer peripheral side of the cylinder 16, but may be disposed in contact with the inner peripheral side of the housing 15A.

Further, in the present embodiment, the first piston chamber 22 is opened from the first piston chamber 22 to the rear end side of the cylinder 16, that is, the second piston chamber 24 side, when the second piston chamber 24 becomes negative pressure. A one-way valve 68 to the two-piston chamber 24 is provided. Specifically, the piston rod 1 of the piston 18
(2) A plurality (usually 2 to 6) of valve holes 20a are formed at equal intervals at outer peripheral positions, and a disc-shaped valve body 70 that opens and closes the valve holes 20a.
Is held at the rear end side of the piston 20 by the valve body guide rod 72.

[0031]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of manufacturing a shock absorber capable of manufacturing an absorber having the above-mentioned known structure or a new structure with good productivity, and a manufacturing apparatus used therefor. is there.

[0032]

A method of manufacturing a shock absorber according to the present invention solves the above-mentioned problems by the following constitution.

A piston device incorporating a piston rod receiving an impact force is provided, and a housing forming an annular space outside the piston cylinder, wherein the cylinder of the piston device is opposite to the first piston chamber on the piston rod side across the piston. The second and third piston chambers and the annular space are filled with hydraulic fluid, the second piston chamber is provided with piston return means, and the peripheral wall of the cylinder of the piston device is A method of manufacturing a shock absorber having a configuration in which a conduction hole on the piston chamber side has an orifice for shock absorption on the second piston chamber side,
A housing member having an inner flange formed by press working at one end of a cut metal tube is chucked to a housing holder of an assembling apparatus with the flange forming side at the lower end, and the lower end is sequentially closed and the first piston rod slides. After inserting and setting the plug block, the piston device, and the second plug block that closes the upper end, the inner flange is pressed to the upper end of the housing member to fix the second plug block.

The manufacturing apparatus used in the method for manufacturing the shock absorber according to the present invention includes a rotary table and component supply means, and a plurality of process stations are arranged outside the rotary table for each process. In the above configuration, the number of chuck devices corresponding to each process station and the housing holder having the receiving step portion are arranged on the rotary table.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the manufacturing method and apparatus according to the present invention will be described below with reference to the drawings. Here, a case of manufacturing the shock absorber according to the above-mentioned prior application will be described as an example.

As shown in FIG. 6, a plurality of process stations S1 to S
12 are arranged. Each process station is as follows.

S1: Housing member setting process station, S2: Piston first assembly component setting process station, S3: Piston assembly component setting process station, S4: Hydraulic oil injection process station, S5 to S7: Hydraulic oil air release process station, S8: Coil spring setting process station, S9: Second plug block setting process station, S10: Inner flange press working process station, S11: Hydraulic oil supply hole closing process station, S12: Finished product removal process station, and each process station Housing holders 80 each having a number of chuck devices 76 and receiving step portions 78 corresponding to S1 to S12 are arranged on the rotary table 74.

In this embodiment, the articulated robots 84A to 84E and the pallets P1 to P1 correspond to the respective steps.
Conveying means provided with P5 (belt conveyor in the example shown)
V1 to V5 are appropriately arranged to automate the manufacturing apparatus.

Here, the multi-joint robot 84 is a multi-joint robot in which the mechanism mounting seat is movable in at least the xy-axis plane and the z-axis (two horizontal and vertical axes) direction. To tell.

The work chuck device C in the housing holder 80 is not particularly limited, but is as shown in FIG.

The work chuck device C has a parallel clamp (usually a self-centering type, the same applies hereinafter) 86 and a first chuck cylinder 88 for operating the parallel clamp 86 as actual constituent parts. The first chuck cylinder 88 includes a rotary valve 90 and a mechanical valve 92.
The air is actuated via the. In the illustrated example, 94 is a work confirmation sensor, and 96 is a cylinder for operating a mechanical valve.

Hereinafter, each step will be described. After the operation of each step is completed, the chuck device and the like return to the original position by the articulated robot or the like. In addition, the turntable 74 is
The pitch is intermittently fed by 0 °.

(1) Housing setting process station S
1 (FIG. 7) The station S1 is a station for setting the hardening member 15B on the housing holder 80 of the turntable 74.

A housing member chuck device C1 is attached to a distal end of a functional component attachment seat (not shown) of the first articulated robot 84A arranged at the station S1. The chuck device C1 includes a collet chuck 9
8 and a second chuck cylinder 100 for operating the collet chuck 98 are actual components.

Here, as the housing member 15B, one obtained by forming an inner flange 62 at one end of a cut metal pipe (usually a steel pipe) by press working is prepared. The housing member is, for example, conveyed by a belt conveyor (first conveying means) V1 and aligned on the first pallet P1.

Then, the housing member 15B is chucked by the chuck device C1 by operating the first articulated robot 84A, and then positioned on the work axis of the station S1. By lowering the chuck device C1, the housing member chuck device C1 is inserted between the open parallel clamps 76 until it comes into contact with the receiving step portion 78 as shown in the figure, and then the parallel clamp 86 is closed. Thus, the housing member 15B is stably set on the housing holder 80 by the parallel clamp 86 and the receiving step portion 78. When this operation is completed, the chuck device C1 returns to the next chuck position of the housing member 15B by the robot 84A.

(2) Piston first assembly part setting process station S2 (FIG. 8) The station S2 is a station for setting the piston first assembly part 26 as shown in FIG. 9 to the housing member 15B.

The first piston assembly part 26 is obtained by removing the first plug block 32 and the second piston assembly part (piston cylinder 16 and elastomer string 21A) of the piston device 14.

The first assembled component chuck device C2 is rotatably releasably mounted on the functional component mounting seat 85B of the second articulated robot 84B arranged at the station S2. The chuck device C2 includes a parallel clamp 8
6B and a chuck cylinder 88B for operating the parallel clamp 86B are actual components. Further, the rotation relief function is configured such that the chuck cylinder 88B is connected to the distal end of the connecting rod 104a of the relief cylinder (rotary cylinder) 104 via the cylinder seat 102.

Here, the first piston assembly parts 26 and 27
Are transported in pallet units by the transport means V2 and are aligned on the pallet P2.

First, the first assembled component 26 is attached to the chuck device C
After chucking at 2, the second articulated robot 84B is operated to be positioned on the work axis of the station S2, and the first plug block 32 is made to face the upper end opening of the housing member 15B. Then, the chuck device C2 is opened. Then, it is rotated by the release cylinder 104 and released from the work axis.
Then, the first plug block 32 slightly drops to the vicinity of the cylinder seat plate block 40 as shown in the figure due to its own weight.

(3) Piston assembly part setting process station S3 (FIG. 9) Third articulated robot 84C arranged at station S3
The second assembled component chuck device C3 is attached to the functional component attachment seat 85C together with the pressing rod 106.

Here, the chuck device C3 has a parallel clamp 86C and a chuck cylinder 88C for operating the parallel clamp 86C as actual constituent parts. The holding rod 106 has a piston cylinder insertion portion 106a.
And a pressing portion 106b which engages the piston cylinder 16 with the end face and slides inside the housing.

Further, below the work position on the work axis of the station S3, a piston rod guide member 108 is provided.
Are arranged to be able to move up and down by an air cylinder 110.

Here, the piston second assembled part 27 is transported in units of pallets by the transport means V3 and is aligned on the pallet P3.

First, after the first assembled part 26 aligned on the pallet P3 is chucked by the third chucking device C3, the third articulated robot 84C is operated to be positioned on the work axis of the station S2, and the example shown in FIG. The piston rod guide member 108 is raised as shown in FIG.
2 is fitted.

In this state, after the chuck of the third chuck device C3 is released, the holding rod 106 is moved down in synchronization with the piston rod guide member 108, and when the parallel clamp and the upper end of the housing member 15B interfere with each other, the ninth and third rods are disengaged. Release the chuck of the chuck device C3, and further press the holding rod 10
6, the first plug block 32 is connected to the housing member 15B.
Lower until bottom.

(3) Hydraulic Oil Injection Process Station S4 (FIG. 10) This station S4 has a hydraulic oil tank 112 and a dispenser (dispensing device) 11 for hydraulic oil injection.
4 is disposed above the turntable 74 and the dispenser 1
Reference numeral 14 is connected to an injection nozzle 116 integrated with the cap 115 via a tube. Then, the injection nozzle 116 is provided with a distribution arm 118 that rotates horizontally and moves up and down.
At the station S4.

First, when the housing member 15B on which the piston assembly parts 26 and 27 are set is positioned on the working axis of the station S4, the dispensing arm 118 sets the injection nozzle 116 on the housing member 15B (by a robot (not shown)). Then, a predetermined amount of hydraulic oil is injected into the housing member 15B.

At this time, the hydraulic oil is injected as shown in the figure.
It is desirable to inject the hydraulic oil from the outer peripheral side while evacuating the inside of the piston cylinder 16 with less air entrapment.

(4) Hydraulic oil air release process station: S
5 to S7 (FIG. 11) In this station, a clamp device 122 which moves up and down by an air cylinder 120 is disposed below the turntable 74 to release hydraulic oil air. The clamping device 1
The basic component 22 is a parallel clamp 124 and a clamp cylinder 126 for operating the parallel clamp.

After the piston rod 12 projecting from below the housing member 15B after the working oil is injected into each station, the piston rod 12 is gripped by the clamp 124 and moved up and down two to three times at each station. Cancel.

(5) Coil spring setting process station S
8 (FIG. 12) This station S8 is provided with a spring supply means formed by combining a parts feeder 128 and a straight-ahead feeder 130, and sets a spring B1 from the tip of the straight-ahead feeder 130 and sets it in a housing. A spring setting device 132 is provided.

In the spring setting device 132, a chuck cylinder 136 provided with a spring chuck 134 at the tip is connected to a piston rod 138a of a vertical cylinder 138, and the vertical cylinder 138 has a cylinder seat 138b and a rotating member of a rotary cylinder 140. The mounting seat 140a of the rotary cylinder 140 is connected to the piston rod 142a of the horizontal cylinder 142, and the mounting seat 142b of the horizontal cylinder 142 is connected to the piston rod 144a of the insertion cylinder 144. A coil spring guide bar 146 is arranged on the work axis of the station S8 so as to be vertically movable by a vertical cylinder 148. In the figure, 150A and 150B are escape cylinders, 152A and 152B are spring confirmation sensors, 153, respectively.
Is a spring guide member.

Here, the spring B1 sent from the parts feeder 128 to the tip of the linear feeder 130 is operated by the chuck cylinder 136 to perform spring chuck. Next, after the spring B is raised by operating the upper and lower cylinders 138, the spring is arranged in the vertical direction by the rotary cylinder 140, and then the spring B is moved to the working axis by the horizontal cylinder 142. In this state, the guide rod 146
To release the spring chuck. Then, the coil spring B falls by its own weight and is set in the housing member 15B.

(6) Second plug block setting process station S9 (FIG. 13) The fourth articulated robot 84D arranged at station S9
The functional cylinder mounting seat 85D has a rotary cylinder 154
The block chuck device C4 is connected to the holding rod 156 via
It is attached with.

Here, the chuck device C4 has a parallel clamp 86D and a chuck cylinder 88D for operating the parallel clamp 86D as actual constituent parts.

Here, the second plug block 34 is transported in pallet units by the transport means V4 and
Are aligned above.

The plug block 34 is connected to the chuck device C4
After chucking at, station S9 with articulated robot 84
After the chuck device C4 on the work axis is opened, the chuck device C4 is rotated to remove the parallel clamp 86D from the work axis. Thereafter, the plug block 34 is pushed into the housing member 15B by the holding rod 154.

(7) Inner flange press working station S
10 (FIG. 14) This station S10 includes a vertical cylinder (caulking cylinder) 158 above the work position on the work axis.
A bending die 160 is disposed, and a work receiving block 162 is provided below the work position with a knuckle mechanism 164.
It is arranged to be able to move up and down. The knuckle mechanism 164 is operated by a knuckle cylinder 166.
Further, a pair of divided holding blocks 168 for holding the peripheral surface of the housing member 15B from left and right are arranged in front and rear of the paper surface. The divided holding block 168 is opened and closed by a cylinder (not shown, on both sides of the paper surface). The cylinder is disposed on a divided pedestal 170, and the divided pedestal 170 is an escape cylinder. 172 makes it possible to move back and forth.

First, after the work W is positioned on the work axis,
The receiving block is raised to support the work on the lower surface, and the divided pedestal 170 is advanced, and the divided holding block 168 holds the peripheral surface of the housing member 15B. In this state, the bending die 160 is lowered to bend the inner flange portion 63. When the bending is completed, each device is returned to the original position.

(8) Oil supply hole closing process station S11
(FIG. 15) Parts feeder 128 provided with a mechanism similar to the spring supply
And the straight feeder 13 at the tip of the parts feeder 128.
0 is connected. The screw B2 of the rectilinear feeder 130 is vacuum-sucked, and a screw tightening device 174 capable of screwing on the work axis is attached to the tip of the articulated robot 84E. In the example shown, 176 is an escape cylinder, and 178 is a screw confirmation sensor.

From the parts feeder 128 to the straight feeder 1
Screw B2 that has been transported to the tip of 30
After holding by vacuum suction at 74, the adhesive A is applied by dip coating if necessary, and then positioned on the work axis and screwed. Then, return to the original position / state.

(9) Finished product removal process station S1
2 (FIG. 7) The articulated robot in the station 12 is also used as the first articulated robot 84A in the housing set station S1.

First, after the finished product has entered the working axis, the finished product is gripped by the chuck device C1 attached to the robot 84A.
Is released, and the finished product is transported to the pallet P5 position of the unloading means V5 by the robot 84A. Thereafter, the pallet is transported to a predetermined position by the unloading means V5.

It should be noted that the manufacturing method of the present invention is not limited to the above-described absorber, but also to an absorber having a conventional configuration, and FIG.
6 can of course be applied to a method of manufacturing a new shock absorber having the configuration shown in FIG.

In the case of the shock absorber of FIG. 16, since the accumulator 21B is incorporated in the first piston chamber 22, it is not necessary to perform the piston assembly parts set in two steps as described above, and the productivity is further improved.

[0078]

According to the method and apparatus for manufacturing a shock absorber of the present invention, a shock absorber can be manufactured with good productivity by the above-described configuration.

That is, in a state where the metal pipe having one end (lower end) formed by the inner flange press working is erected, the components may be sequentially inserted, and finally the other end (the upper end) may be subjected to the inner flange press working. Easy.

Further, if a housing member holder consisting of a bottom receiving member and a chuck member is distributed at a predetermined pitch to a rotating table which is intermittently fed at a predetermined pitch, a component set robot and a processing device are provided at each station. As a result, the shock absorber can be manufactured continuously, and the manufacturing productivity is increased.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of a shock absorber when no load is applied.

FIG. 2 is a schematic sectional view of the shock absorber of FIG. 1 when receiving an impact load.

FIG. 3 is a schematic cross-sectional view at the time of no load in one embodiment of the shock absorber of the present invention.

FIG. 4 is a schematic sectional view of the shock absorber of FIG. 3 when receiving an impact load;

FIG. 5 is an enlarged cross-sectional view of the piston part of FIG. 3;

FIG. 6 is an overall layout view of a manufacturing apparatus applied to the method of manufacturing a shock absorber according to the present invention.

FIG. 7 is a cross-sectional view of a part omitted for description in a housing setting step and a finished product removing step station.

FIG. 8 is a cross-sectional view of a main part of an explanation part omitted at a piston first assembly part setting process station.

FIG. 9 is a cross-sectional view of a principal part omitted for description at a piston second assembly part setting process station.

FIG. 10 is a cross-sectional view of an essential part of a portion omitted for explanation in a hydraulic oil injection step station

FIG. 11 is a cross-sectional view of an essential part of a portion omitted for explanation in a hydraulic oil air bleeding process station.

FIG. 12 is a cross-sectional view of the main part of the coil spring assembling process station, which is partially omitted for description.

FIG. 13 is a cross-sectional view of the main part of the second plug block assembling process station, which is partially omitted for description.

FIG. 14 is a cross-sectional view of the main part of the inner flange press working process station, which is omitted for the purpose of illustration.

FIG. 15 is a cross-sectional view of a main part of a part omitted for description in a hydraulic oil supply hole closing screw process station;

FIG. 16 is a sectional view of another shock absorber to which the manufacturing method of the present invention is applied.

[Explanation of symbols]

 12 Piston rod 14 Piston device 15, 15A Housing (outer cylinder) 15B Housing member 16 Cylinder 18 Piston 20a Valve hole 20 Piston rod 22 First piston chamber 24 Second piston chamber 18 Accumulator holding space (annular space) 28 Piston return means ( Coil spring) 30 orifice 29 conduction hole 21, 21A, 21B accumulator 62, 63 inner flange press working 74 turntable 78 receiving step 80 housing holder 84A-84E first-fourth articulated robot 86, 86A-86E parallel clamp 88 , 88A-88E Chuck cylinder C, C1-C4 Chuck device

Claims (7)

[Claims] 1. A piston device incorporating a piston rod receiving an impact force, and a housing forming an annular space outside a piston cylinder, wherein the cylinder of the piston device is a first piston on a piston rod side with a piston interposed therebetween. A second piston chamber opposite to the chamber, a working fluid is sealed in the first and second piston chambers and the annular space, a piston return means is provided in the second piston chamber, and a cylinder of the piston device is provided. Is a method of manufacturing a shock absorber having a configuration in which a conduction hole is provided on the first piston chamber side and an orifice for absorbing shock is provided on the second piston chamber side, and an inner flange is provided at one end of the cut metal pipe. The housing member formed by pressing is chucked to the housing holder of the assembly device with the flange forming side at the lower end. Then, sequentially, after inserting and setting the first plug block in which the lower end is closed and the piston rod slides, the piston device, and the second plug block in which the upper end is closed, the inner flange is pressed into the upper end of the housing member. Fixing the second plug block by using the above method. 2. The method according to claim 1, further comprising the step of injecting the operating oil while vacuuming the inside of the housing after inserting the piston device and before inserting the second plug block. Manufacturing method of shock absorber. 3. The method for manufacturing a shock absorber according to claim 2, wherein the injection of the hydraulic oil is performed to an outer peripheral side of the piston cylinder. 4. The method for manufacturing a shock absorber according to claim 1, wherein an accumulator made of an elastic sponge is arranged in the annular space of the shock absorber. 5. A piston assembly part setting step of pushing the piston device, in which a first plug for closing the lower end of the housing is assembled to a rod, into the cylindrical housing having an engaging portion at the lower end and having an upper opening. Injecting hydraulic oil while bleeding air from the upper end, and injecting hydraulic oil to reciprocate the piston rod to fill it with hydraulic oil. After loading a coil spring as piston return means at the upper end of the piston of the piston device, replenish the oil. Final setting step of pushing a second plug with a hole, caulking the upper end of the housing to fix the second plug,
2. The method for manufacturing a shock absorber according to claim 1, further comprising an assembly completion step of closing an oil supply hole of the second plug. 6. A manufacturing apparatus used for manufacturing the shock absorber according to claim 1, comprising: a rotary table; and a component supply means, wherein a plurality of process stations are assigned to each process outside the rotary table. An apparatus for manufacturing a shock absorber, wherein a number of chuck devices corresponding to each process station and a housing holder having a receiving step are arranged on a rotary table. 7. An apparatus for manufacturing a shock absorber according to claim 6, wherein said part setting means is formed by adding each setting mechanism to an articulated robot.