JPH07136726A - Method for binding cylindrical member and device therefor - Google Patents

Abstract

PURPOSE:To prevent return of a bent part by spring-back by forming recessed parts on the bent part which is formed on a cylindrical member. CONSTITUTION:The bent part is formed by bending the opening part 6E of a housing cylinder 6 by a first punch 33 in the inward radial direction, each projecting part of a binding member 37 which is fitted to a second punch 35 is pressed to contact with the formed bent part to form each recessed part on the bent part. Accordingly, the spring-back generated on the bent part after the opening part 6E is bent is restrained by each recessed part and the members of an orifice cylinder, a shutter cylinder, etc., housed in the housing cylinder 6 are surely bound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for use in fastening (caulking) the opening side of tubular members such as damping force adjusting type shock absorbers, hydraulic / pneumatic cylinders, fluid pipes and the like. TECHNICAL FIELD The present invention relates to a fastening method for a member and a fastening device therefor.

[0002]

2. Description of the Related Art Generally, a vehicle such as an automobile is provided with a shock absorber between a vehicle body and wheels in order to quickly damp vibrations during traveling. A cylindrical cylinder filled with oil liquid, a piston that is axially movably inserted into the cylinder and defines two oil chambers in the cylinder, and one end of the piston enters the cylinder. It is composed of a piston rod connected to the piston and the other end of which protrudes outside the cylinder. Damping vibrations by giving a resistance force to the oil liquid flowing between the oil chambers in the cylinder. A damping mechanism is provided.

There is also a shock absorber in which the damping force by the damping mechanism can be adjusted so that a desired damping force can be obtained according to the running state. The force adjusting mechanism is provided in the middle of a communication passage that communicates between the oil chambers, and is roughly composed of an orifice cylinder having an orifice that makes the flow passage area of the communication passage variable by mutually rotating and a shutter cylinder having a shutter. The orifice cylinder and the shutter cylinder are housed in a housing cylinder as a cylindrical member having a bottom and fixed to one end of a piston rod, and the opening end side of the housing cylinder is bent radially inward. By being bent to form a bent portion, it is fixed in the housing cylinder.

Next, a method of fastening the opening side of the housing cylinder will be described. First, the piston, the housing cylinder and the like are assembled on one end side of the piston rod, and the orifice cylinder, the shutter cylinder and the like are assembled in the housing cylinder. Then, the storage cylinder is fixed on the pedestal with the opening side of the storage cylinder facing upward, and the fastening punch is pressed from the upper side toward the opening side of the fixed storage cylinder. Here, a shallow hole portion having a diameter equivalent to the outer diameter of the opening portion of the accommodating cylinder is formed on the lower end surface side of the punch, and the outer peripheral bottom portion of the hole portion is guided with a predetermined curvature. A shoulder is formed. As a result, by pressing the opening of the accommodating cylinder against the guide shoulder, the curvature is bent so that the entire circumference of the opening is guided inward in the radial direction, and the bent portion (circumferential caulking portion) is formed. The orifice cylinder, the shutter cylinder and the like are fastened in the housing cylinder by the bent portion.

[0005]

By the way, in the above-mentioned method of fastening the container according to the prior art, the bent portion is formed over the entire circumference on the opening side of the container so that the container is provided inside the container. The assembled orifice cylinder and shutter cylinder are fastened together.

However, in this fastening method, since the bent portion is formed on the opening side of the container by one fastening, the bent portion formed on the opening side returns due to the spring back. If a machining error occurs in the chamfered portion of the orifice cylinder or the shutter cylinder, the fixing of the orifice cylinder and the shutter cylinder is loosened, abnormal noise is generated, and oil is leaked to adjust the damping force. However, there is a problem in that the reliability and the service life are significantly reduced.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to prevent the bent portion from returning by spring back by forming a recessed portion in the bent portion formed in the tubular member. An object of the present invention is to provide a method for fastening a tubular member and a fastening device therefor.

[0008]

In order to solve the above-mentioned problems, the method adopted by the method for fastening a tubular member according to the present invention has a tubular shape having an opening at one end and parts provided therein. A fastening direction in which the component is fastened to the tubular member by bending the opening portion of the member in an inner peripheral direction, and a step of assembling the internal component in the tubular member; By supporting the opening part of the tubular member upward, forming a bent part by bending the opening part of the tubular member inward in the radial direction, and pressing the projection to the bent part. And a step of forming a recessed portion in the bent portion.

The tubular member fastening device according to the present invention employs a tubular member having an opening at one end, a recess on the outer periphery on the other end, and a component inside. A fastening device for fastening the component to the tubular member by bending the opening inward in the radial direction, wherein the tubular member is engaged with the concave portion with the opening of the tubular member facing upward. Supporting means for supporting the cylindrical member in the axial direction and one end of the tubular member, so that the opening side is guided inward in the radial direction by contacting the opening side of the tubular member. A first fastening means that is bent to form a bent portion, and is provided so as to be adjacent to a side of the first fastening means, and a depression is formed in the bent portion by press-contacting the bent portion. Second fastening means having a projection, the tubular member and the first fastening means or the second fastening hand To move the supporting means, the first fastening means, and the second fastening means relative to each other so as to arrange them on the same axis line, and the first fastening means arranged on the same axis line as the tubular member. Alternatively, it is composed of a pressure contacting means which moves so as to be relatively close to the second fastening means and presses it.

[0010]

With the construction of the method of fastening the tubular member, the parts are assembled in the tubular member in the first step, and the tubular member is supported in the second step with the opening facing upward. In step 3, the opening of the tubular member is bent inward in the radial direction to form a bent portion, and in the fourth step, a protrusion is pressed against the bent portion to form a recess. The return due to the springback generated in the bent portion is suppressed, and the component in the tubular member is securely fixed by the bent portion.

Further, according to the construction of the tubular member fastening device, an opening portion is provided at one end, and a concave portion is provided at the outer periphery on the other end side.
The tubular member, in which the components are provided, is axially supported by the supporting means in the state of having the opening portion facing upward through the concave portion, and then is brought relatively close to the first fastening means by the press contacting means. It is pressure-contacted, its opening side is guided inward in the radial direction and bent, and a bent portion is formed on the opening side.
Next, the tubular member is arranged on the same axis as the second fastening means by the moving means, and in this state, the tubular member relatively approaches the second fastening means, and the projection of the second fastening means is brought into pressure contact. A recess is formed in the bent portion. This allows
The return due to the springback generated at the bent portion is suppressed, and the components in the tubular member are securely fastened by the bent portion.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 13 by taking as an example a housing cylinder used as a tubular member in a damping force adjusting mechanism of a damping force adjusting hydraulic shock absorber.

First, FIG. 1 is a vertical sectional view of a hydraulic shock absorber as a shock absorber applied to this embodiment. In FIG.
Reference numeral 1 denotes a cylindrical cylinder whose upper and lower ends are closed, and 2 denotes a piston which is located inside the cylinder 1 and is slidably fitted in the axial direction. , The lower two oil chambers A and B are defined. Also, the piston 2
Oil holes 2A and 2A are formed in the oil chamber so that the oil chambers A and B communicate with each other.

Denoted at 3 and 3 are disc valves provided on both upper and lower sides of the piston 2, respectively.
Opens each oil hole 2A of the piston 2 by its spring force,
By closing and applying flow resistance to the oil liquid flowing in each oil hole 2A, a predetermined damping force is generated when the piston rod 4 described later is expanded and contracted.

Reference numeral 4 denotes a piston rod which is attached to the piston 2 or the like on the lower end side which has entered the cylinder 1 to form a small diameter portion 4A, and whose upper end side projects and extends outside the cylinder 1.
A screw portion 4B is formed on the lower end side of the small diameter portion 4A. Further, an oil passage 4C that communicates the oil chamber A with the inside of a housing cylinder 6 described below is axially extended and bored in the piston rod 4, and a control rod 10 described below is provided in the oil passage 4C. It is rotatably inserted.

Reference numeral 5 denotes a damping force adjusting mechanism provided on the lower end side of the piston rod 4, and 6 denotes a tubular member constituting the damping force adjusting mechanism 5 together with an orifice cylinder 7, a shutter cylinder 9, a control rod 10 and the like which will be described later. Each of the storage cylinders 6 has a stepped portion including a cylinder portion 6A that extends in the cylinder 1 in the axial direction, and a recessed portion 6B that is provided on the outer periphery of the cylinder portion 6A on the upper end side and has a reduced diameter. It is formed in a tubular shape and is screwed to the threaded portion 4B of the piston rod 4 via the inner peripheral side of the recess 6B. Further, an annular groove 6C is formed on the inner periphery of the lower end side of the cylindrical portion 6A, and the accommodation cylinder 6 is formed at the bottom of the annular groove 6C.
Communication holes 6D, 6D for communicating the inside and the outside are bored in the radial direction. Further, as shown in FIG. 2 (the upper end in FIG. 2), the lower end of the tubular portion 6A becomes a short opening 6E in a state before assembly, and a fastening device 14 to be described later is provided in the opening 6E.
By the fastening process by the
The hollow portion 13 is formed.

Reference numeral 7 is inserted into the accommodation cylinder 6 and the bent portion 1
2, an orifice cylinder fastened by a recess 13 through a disc-shaped closing plate 8 is shown. The orifice cylinder 7 has an upper end side which is opened and closed by a check valve 11 which will be described later, and a control rod. An oil hole 7A through which 10 is inserted is provided. Further, on the lower end side of the orifice cylinder 7,
Two orifices 7 communicating with the respective communication holes 6D of the housing cylinder 6
B and 7B are provided in the radial direction.

Reference numeral 9 denotes a shutter cylinder that is located inside the orifice cylinder 7 and is rotatable relative to the orifice cylinder 7. The shutter cylinder 9 has a plurality of flow holes 9 on its upper surface side.
A, 9A, ... (Only two are shown) are bored, and a shutter 9B that communicates the inside and the outside of the shutter cylinder 9 is axially cut out on the outer peripheral side. Here, the shutter 9B of the shutter cylinder 9 adjusts the flow passage area of the flow passage formed between the shutter 9B and the orifice 7B of the orifice cylinder 7 by rotating relative to each of the orifices 7B. .

Reference numeral 10 denotes a control rod which extends in the oil passage 4C of the piston rod 4 in the axial direction and is rotatable relative to the piston rod 4. The control rod 10 has a cutout portion at its lower end side. 10A is fitted and fixed to the shutter cylinder 9, and the upper end side is connected to a drive motor (not shown).

Reference numeral 11 denotes a check valve provided on the upper end side of the orifice cylinder 7, and the check valve 11 is the orifice cylinder 7
A disk-shaped valve plate 11A that abuts on the upper surface of the valve plate and opens and closes the oil hole 7A using the upper surface as a valve seat, and a coil spring disposed between the valve plate 11A and the lower end side of the housing cylinder 6. 11B, the coil spring 11B constantly urges the valve plate 11A in the valve closing direction and opens the valve plate 11A when the oil liquid on the oil hole 7A side reaches a predetermined pressure or more. The spring force is set so as to allow the oil liquid to flow out to the oil passage 4C side of the piston rod 4.

Damping force adjusting mechanism 5 having such a configuration
Is assembled with the orifice cylinder 7, the shutter cylinder 9, and the closing plate 8 in the housing cylinder 6, and in this state, the opening 6E of the housing cylinder 6 is bent inward in the radial direction over the entire circumference to form the opening 6E. Is formed into a bent portion 12 (circumferential caulking portion), and then the recessed portion 1 is formed in the bent portion 12 and extends in the radial direction while being separated in the circumferential direction.
, 3, to form an orifice cylinder 7 and a shutter cylinder 9
Etc. are fastened (caulked) into the housing cylinder 6.

Then, the damping force adjusting mechanism 5 rotates the drive motor to rotate the shutter cylinder 9 relative to the orifice cylinder 7 via the control rod 10, whereby the shutter 9B of the shutter cylinder 9 and the orifice cylinder 7 are rotated. The damping area is controlled by adjusting the flow passage area of the flow passage formed by the orifice 7B and the flow resistance applied to the oil liquid passing through the flow passage.

Next, the fastening device 14 for fastening the opening 6E of the housing cylinder 6 will be described with reference to FIGS.

In the figure, reference numeral 15 denotes a frame of the fastening device 14, and the frame 15 has a plurality of legs 16A,
16A and a lower plate 16 supported on 16A, and an upper plate 1 supported on the lower plate 16 via a plurality of columns 17A, 17A ,.
The lower plate 16 is provided with an insertion hole 16B in the upper and lower direction, through which the piston rod 4 is inserted.

Reference numeral 18 denotes a support pedestal as a support means provided in the central portion of the lower plate 16, and the support pedestal 18 is shown in FIG.
As shown in FIG. 3, it is roughly composed of a plurality of chuck portions 18A, 18A (only two are shown) that can be expanded and contracted in the radial direction, and an actuator (not shown) that expands and contracts each chuck portion 18A. By engaging the inner peripheral side end portion of the chuck portion 18A with the concave portion 6B of the housing cylinder 6 at the time of contraction,
The housing cylinder 6 is positioned at a predetermined position and fixed in the axial direction (upward and downward).

Reference numeral 19 denotes a plurality of hanging rods 2 on the upper plate 17.
A slide mechanism as a moving means that is suspended via 0, 20 (only two are shown) is shown.
A slide base 21, a slide member 22, support cylinders 23 and 24, a moving cylinder 25, and a positioning member 26, which will be described later, are roughly configured.

Reference numeral 21 denotes a slide base hung by each of the hanging rods 20. The slide base 21 is formed in a long plate shape extending in the left and right directions, and is arranged on the lower surface side so as to face each other. A guide rail 21A having a U-shaped cross section (only one of which is shown) is fixed so as to extend in the left and right directions. Further, the slide base 21 includes
Groove 21 extending leftward and rightward while penetrating upward and downward
B is formed, and the groove portion 21B allows the upper ends of the support cylinders 23 and 24 to project upward and also allows the support cylinders 23 and 24 to move in the left and right directions. Further, stoppers 21C and 21D are provided on the left and right ends of the slide base 21 so as to project downward.

Reference numeral 22 denotes a slide member provided on the lower surface side of the slide base 21, and both ends of the slide member 22 are supported by guide rails 21A so as to be movable in the left and right directions. In addition, fitting holes 22A and 22B into which the first support cylinder 23 and the second support cylinder 24 are fitted and fixed are formed in the slide member 22 so as to be adjacent to each other in the left and right directions.

Reference numeral 23 denotes a first support cylinder fitted and fixed to the fitting hole 22A of the slide member 22, and 24 denotes a second support cylinder fitted and fixed to the fitting hole 22B.
On the lower end side of 24, a flange portion 23 protruding in the radial direction
A and 24A are integrally formed, and the flange portions 23A and 2A
4A controls the upward movement of the support cylinders 23 and 24.

Reference numeral 25 denotes a moving cylinder attached to the stopper 21D on the right side of the slide base 21, and the tip of the rod 25A of the moving cylinder 25 is fixed to the right end side of the slide member 22. Then, the moving cylinder 25
The first punch 33 and the second punch 35, which will be described later, are selectively arranged on the axis of the housing cylinder 6 supported by the support pedestal 18 by moving the slide member 22 in the left and right directions.

Reference numeral 26 denotes a positioning member provided on the left end side of the slide member 22. The positioning member 26 has a base end side fixed to the slide member 22 and a tip end side provided with the stopper 2.
Threaded portion 26 extended through a 1C insertion hole (not shown)
A and a plurality of nuts 26 screwed to the screw portion 26A
B, 26B, ... Then, the positioning member 26 adjusts the nut 26B to abut the stopper 21C in a state where the first punch 33 and the second punch 35 are arranged on the axis of the housing cylinder 6 supported by the support pedestal 18, respectively. As a result, the first punch 33 and the second punch 35 are accurately positioned with respect to the housing cylinder 6.

Reference numeral 27 denotes a first elevating rod which is inserted into the first support cylinder 23 so as to be movable up and down.
The lower end side of 7 is enlarged in diameter through a step portion 27A, and a mounting hole 27B into which the small diameter portion 33A of the first punch 33 is inserted is formed in the center of the lower end side thereof. Further, a washer 28 is fitted to the upper end side of the first elevating rod 27 so as to project in the radial direction, and the first elevating rod 27 is interposed between the washer 28 and the upper end surface of the first support cylinder 23. A coil spring 29 that constantly biases upward is provided.

Reference numeral 30 denotes a second elevating rod which is inserted into the second support cylinder 24 so as to be movable up and down, and the second elevating rod 3
The lower end side of 0 is enlarged in diameter through a step portion 30A. A washer 31 is fitted to the upper end side of the second elevating rod 30 so as to project in the radial direction, and the second elevating rod 30 is always directed upward between the washer 31 and the second support cylinder 24. A coil spring 32 for urging is arranged.

Reference numeral 33 denotes a first punch as a first fastening means provided on the lower end side of the first elevating rod 27.
The punch 33 is fitted and fixed to the mounting hole 27B of the first elevating rod 27 via a small diameter portion 33A formed on the upper end side. In addition, on the lower surface side of the first punch 33, as shown in FIG.
As shown in FIG. 5, a circular and shallow fastening hole 34 is formed, and the outer periphery of the fastening hole 34 on the bottom side is a guide shoulder portion 34A having a predetermined curvature. Further, the diameter dimension of the fastening hole 34 is set to be slightly larger than the outer diameter of the opening 6E of the housing cylinder 6 at the opening end and substantially the same as the opening 6E on the bottom side.

Reference numeral 35 denotes a second punch serving as second fastening means provided on the lower end side of the second elevating rod 30, and 36 denotes a punch body which constitutes the second punch 35 together with a fastening member 37 which will be described later. The punch main body 36 is externally fitted to the lower end side of the second elevating rod 30 via a diameter-increasing cylindrical portion 36A located at the upper end side and having an enlarged diameter. In addition, a housing hole 36B into which the fastening member 37 is inserted is formed on the lower end side of the punch body 36.

37 is a punch main body 36 by a bolt 38.
Shows a fastening member that is detachably inserted into and accommodated in the accommodation hole 36B of the same. The lower end side of the fastening member 37 is a cylindrical portion 37A protruding downward as shown in FIGS. 37A
Are integrally provided on the lower end surface thereof with four protrusions 37B, 37B, ...

Reference numeral 39 denotes a pushing actuator provided as a pressure contact means provided in the center of the lower surface side of the upper plate 17, and the pushing actuator 39 is arranged on the same axis as the housing cylinder 6 supported by the support pedestal 18. The lower end side thereof pushes the first elevating rod 27 or the second elevating rod 30 downward against the urging force of the coil springs 29 and 32, and presses the opening 6E of the housing cylinder 6 into pressure contact. 39A is provided.

The fastening device 14 for the storage cylinder 6 according to this embodiment has the above-mentioned construction. Next, the fastening method will be described.

First, in the first step, as shown in FIGS. 3 and 4, the piston 2 is fitted with the piston 2 and the housing cylinder 6, and the housing cylinder 6 is provided with an orifice cylinder 7, a shutter cylinder 9, and a closing plate. 8 and the like are assembled (hereinafter referred to as assembly 40). Then, in a second step, the assembly 40 is moved toward the support base 1 with the opening 6E of the housing cylinder 6 facing upward.
Attach to 8.

Next, in the third step, the first punch 33 is arranged on the axis of the housing cylinder 6, and in this state, the pushing portion 39A of the pushing actuator 39 is moved downward to move the pushing portion 3
9A pushes the first elevating rod 27 downward against the biasing force of the coil spring 29. As a result, the first punch 33 attached to the lower end side of the first elevating rod 27 is attached.
Presses the opening 6E of the housing cylinder 6 from the upper side, and the opening 6E pressed by the first punch 33 enters the fastening hole 34 as shown in FIG. The closing plate 8 is bent radially inward by the portion 34A.
The bent portion 12 is formed so as to contact the upper surface of the.

Here, when the first punch 33 is separated from the housing cylinder 6, the bent portion 12 is separated from the closing plate 8 by spring back, as shown in FIG.

Next, in the fourth step, first, as shown in FIG. 10, the rod 25A of the moving cylinder 25 is extended to arrange the second elevating rod 30 and the second punch 35 on the axis of the housing cylinder 6. . Then, in this state, like the third step,
The second actuator 3 pushes the second lifting rod 30 downward against the biasing force of the coil spring 32 by the pushing actuator 39, and the second punch 3 attached to the lower end side of the second lifting rod 30.
Bending part 12 formed by fastening member 37 of No. 5 to housing cylinder 6
Press against. Thereby, each protrusion 3 of the fastening member 37
7B are pushed into the bent portion 12 as shown in FIG. 11, and when the second punch 35 is separated from the housing cylinder 6, four 7B are provided on the upper surface side of the bent portion 12 as shown in FIGS. The hollow portion 13 is formed. As a result, the bent portion 12
The springback that has occurred in each of the recesses 13 is suppressed by the recesses 13, and the inside of each recess 13 abuts on the closing plate 8, and at the bent portion 12 through the closing plate 8, the orifice cylinder 7, the shutter cylinder 9, etc. Can be securely fastened in the housing cylinder 6.

Thus, according to the present embodiment, the opening portion 6E of the housing cylinder 6 is bent by the fastening hole 34 of the first punch 33.
2 and then the fastening member 3 attached to the second punch 35
7 in each projection 37B, and each recess 1 in each bent portion 12
By forming 3, the bending portion 12 can be prevented from returning due to springback, and the bending portion 12 can be prevented from separating from the closing plate 8.
The orifice cylinder 7, the shutter cylinder 9 and the like can be securely fastened (caulked) in the housing cylinder 6 without rattling, generation of abnormal noise and damage can be prevented, and damping force due to leakage of oil liquid can be prevented. It is possible to prevent misalignment and the like, and it is possible to greatly improve reliability and life.

Further, even if there are some processing errors in the orifice cylinder 7 and the shutter cylinder 9, the orifice cylinder 7 and the shutter cylinder 9 can be securely fixed, so that the orifice cylinder 7, the shutter cylinder 9 and the like can be fixed. The processing accuracy can be set low, and the manufacturing cost can be reduced.

Further, in the fastening device 14, the first punch 33 and the second punch 33 are provided between the support base 18 and the push actuator 39.
Since the punch 35 and the punch 35 are selectively arranged by the slide mechanism 19, the entire apparatus can be made compact, and the movement amount of the first punch 33 and the second punch 35 can be made small to accelerate the machine tact and improve the productivity. Can be suppressed.

Further, the second punch 35 is the punch body 3
Since the fastening member 37 is attached and detachably inserted into the accommodation hole 36B of 6, the material of the accommodation cylinder 6 and the bent portion 1
Even if the shape of 2 is changed, the fastening member 37 can be easily changed to another fastening member, for example, one having two or five or more protrusions, or a cylindrical or spherical shape for each protrusion. You can change it to what you do, and you can broaden the scope of application.

In the above embodiment, the assembly 40 is fixed, and the first punch 33, the second punch 35, etc. are attached to the assembly 40.
Therefore, until the orifice cylinder 7, the shutter cylinder 9 and the like are fixed in the assembly 40,
The orifice cylinder 7, the shutter cylinder 9 and the like can be surely prevented from being displaced in the assembly 40, and the orifice cylinder 7, the shutter cylinder 9 and the like can be accurately fixed in the housing cylinder 6.

In the above embodiment, the assembly 40 including the housing cylinder 6 and the like is fixed to the support pedestal 18, and the first punch 3 is used.
Although the case where the third punch 35 is selectively moved by the slide mechanism 19 on the axis of the housing cylinder 6 has been described as an example, the present invention is not limited to this.
The punch 35 may be fixed and the housing cylinder 6 may be moved on the axis of each punch 33, 35. In this case, the push actuator 39 may be moved together with the housing cylinder 6, or The push actuators 39 may be provided on the punches 33 and 35 one by one.

Further, in the above-described embodiment, the housing cylinder 6 is fixed to the support pedestal 18, and the first housing is fixed to the opening 6E of the housing cylinder 6.
The punch 33 has been described as an example in which the second punch 35 is moved toward each other with respect to the bent portion 12, but the first punch 33 and the second punch 35 are fixed and supported on the support base. It is also possible to move the stored container 6 to the punches 33, 35 by a pushing actuator so as to approach them.

Further, in the above embodiment, the case where the opening 6E of the housing cylinder 6 used for the damping force adjusting mechanism of the damping force adjusting type hydraulic shock absorber is fastened as the tubular member has been described as an example. The invention is not limited to this, and may be used, for example, to fasten a coupling joint to an end of a fluid pipe or to fasten a bottom cap to a tube of a cylinder device.

[0051]

As described in detail above, according to the method of fastening a tubular member according to the present invention, parts are assembled in the tubular member in the first step, and the tubular member is attached in the second step. The opening is supported upward, and in the third step, the opening of the tubular member is bent inward in the radial direction to form a bent portion, and in the fourth step, a projection is formed on the bent portion. Since the depressions are formed by press-contacting with each other, it is possible to suppress the return of the bent portion due to the spring back, and the contents in the tubular member can be securely fastened by the bent portion to cause abnormal noise. It is possible to prevent the occurrence of damage and damage, and also to prevent the adjustment of the damping force due to the leakage of the oil liquid, thereby improving the reliability and life.

Further, according to the tubular member fastening device of the present invention, a tubular member having an opening at one end, a recess on the outer periphery on the other end side, and a component provided therein is provided. After the opening portion is axially supported by the supporting means in the state in which the opening portion is directed upward, the pressing portion is brought into relatively close contact with the first fastening means so as to make the opening portion inward in the radial direction. The bent member is guided and bent to form a bent portion on the opening side, and then the tubular member is arranged on the same axis as the second fastening means by the moving means, and in this state, the second fastening is made by the pressure welding means. Since the protrusion of the second fastening means is brought into pressure contact with each other to form the recessed portion in the bent portion, the springback generated in the bent portion without lowering the productivity. In addition to being able to suppress the return due to And are contained goods can be reliably fastened by easy machining.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a main part of a hydraulic shock absorber having a housing cylinder that has been subjected to a fastening process by a fastening device according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical cross-sectional view of a main part shown in a state before fastening processing is performed on the opening of the housing cylinder in FIG.

FIG. 3 is a vertical sectional view showing the fastening device according to the present embodiment.

FIG. 4 is a vertical sectional view showing an enlarged main part in FIG.

FIG. 5 is a partially cutaway external view showing a fastening hole of a first punch in an enlarged manner.

FIG. 6 is an enlarged vertical sectional view showing a state in which a fastening member is housed in a punch body of a second punch.

FIG. 7 is an external perspective view showing the fastening member from the lower side.

FIG. 8 is an operation explanatory view showing a state in which a bent portion is formed in the opening of the housing cylinder by the first punch in the third step.

FIG. 9 is a partially cutaway external view showing a bent portion formed in a housing cylinder by a third step.

10 is a vertical cross-sectional view of the fastening device similar to FIG. 3, showing a state in which a second punch is arranged on the axis of the housing cylinder.

FIG. 11 is an operation explanatory view showing a state in which each recess is formed in the bent portion of the housing cylinder by the second punch in the fourth step.

FIG. 12 is an external view of a partially broken view of a housing cylinder showing each recess formed in the bent portion by a fourth step.

FIG. 13 is an external perspective view of a housing cylinder showing each recess formed in the bent portion in the fourth step.

[Explanation of symbols]

 6 Storage Cylinder (Cylindrical Member) 6B Recess 12 Bent 13 Depression 14 Fastening Device 18 Support Pedestal (Support Means) 19 Slide Mechanism (Movement) 33 First Punch (First Fastening Means) 34 Fastening Holes 35 Second Punch (second fastening means) 37 Fastening member 37B Projection (projection) 39 Pushing actuator (pressing means)

Claims (2)

[Claims] 1. A fastening direction for fastening a component to the tubular member by bending the opening of a tubular member having an opening at one end and having a component provided inside thereof in an inner circumferential direction. Then, the step of assembling the internal parts in the tubular member, the step of supporting the opening of the tubular member upward, and the folding of the opening of the tubular member inward in the radial direction all around. A method for fastening a tubular member, which comprises a step of forming a bent portion by bending, and a step of forming a recessed portion in the bent portion by pressing a protrusion onto the bent portion. 2. A component which is formed by bending an opening of a tubular member having an opening at one end and a recess on the outer periphery on the other end side and having a component inside thereof inward in the radial direction. A fastening device for fastening the tubular member to the tubular member, the support device engaging the recess with the opening of the tubular member facing upward, and supporting the tubular member in the axial direction; First fastening means which is provided on one end side of the member and which is bent so as to guide the opening side inward in the radial direction by contacting the opening side of the tubular member; A second fastening means provided adjacent to the side of the first fastening means and having a protrusion that forms a recessed portion in the bent portion by being pressed against the bent portion; In order to arrange the first fastening means or the second fastening means on the same axis, the supporting means and the first fastening means Moving means for relatively moving the second fastening means and the first fastening means or the second fastening means arranged on the same axis as the tubular member so as to relatively approach each other, A fastening device for a tubular member, which comprises a pressure contact means for pressure contact.