JP5722940B2 - Lid fixing method and shock absorber manufacturing method using the method - Google Patents

Description

  The present invention relates to a method of fixing a cylindrical lid member in a state where it is prevented from rotating inside the end opening side of a cylinder.

Conventionally, the following methods are known as a method for fixing a cylindrical lid member in a state in which the cylindrical lid member is prevented from rotating around the end opening of the cylinder.
That is, the thickness of the cylinder at the open end of the cylinder is made thinner than the thickness of the cylinder at the center side of the cylinder so that the cylinder inner peripheral surface at the end of the cylinder and the center of the cylinder where the cylinder is thick A stepped portion with the inner peripheral surface of the cylinder is formed, a columnar lid member is inserted into the inside of the cylinder from the end opening of the cylinder, and the bottom surface that is one end surface of the column of the lid member is placed on the stepped surface. Place and crimp the end opening edge of the cylinder in close contact with the outer surface which is the other end face of the column of the lid material, and the outer peripheral surface on the end opening side of the cylinder in the direction of the outer peripheral surface of the lid material In the fixing method of pressing and caulking, as the lid material, a lid material having a configuration in which a concave portion is formed on the circumferential surface of the column and a boundary portion between the end surface of the column and the circumferential surface is formed on the easily deformable portion is used. There is a known method (see, for example, Patent Document 1).

JP 2009-262203 A

However, according to the above-described fixing method of the lid member, so-called rolling caulking (oscillating curl processing) is performed in which the end opening edge of the cylinder is caulked so as to be in close contact with the outer surface that is the other end surface of the lid column. A caulking step and a caulking step called so-called detent caulking (clinching) are performed in which the outer peripheral surface on the end opening side of the cylinder is pressed in the direction of the outer peripheral surface of the lid member.
Furthermore, by forming separate annular circumferential grooves on both the circumferential surface and end surface of the lid material column, a protruding piece-shaped lip portion is formed and a recess is formed on the circumferential surface of the lid material column. In addition to this, a plurality of recesses must be formed on the outer peripheral surface of the cylinder.
That is, in the conventional lid fixing method described above, two types of caulking processes are required, which increases the number of man-hours and the number of material processing.
The present invention provides a lid fixing method and the like that can fix the lid inside the end opening side of the cylinder so that the lid does not rotate with a small number of man-hours.

The lid member fixing method according to the first aspect of the invention is such that the center line of the cylinder forming the inner tube or the outer tube of the front fork used in the motorcycle coincides with the center line of the columnar lid member. This is a lid fixing method in which a lid member is fitted inside the end opening side of the cylinder and the lid member is fixed inside the end opening side of the cylinder so that the lid member does not rotate around the center line. The cylinder has an inner peripheral diameter on the end opening side of the cylinder that is larger than an inner peripheral diameter on the center side of the cylinder. A lid material placement portion formed by an annular flat surface centered on a center line of a cylinder that is a stepped portion with the peripheral surface, and a lid material fitting portion formed by a cylinder inner peripheral surface on the end opening side configured Te, the lid is the peripheral surface of the pillars extending the one end face and the bar of the other end face of the pillar plane Includes a cutout portion that is more formed, the lid member is inserted from the end opening of the cylinder to the inside of the end portion opening side, the cover material cylinder end opening side of the plane and cylinder formed on the peripheral surface of the pillar A gap is formed between the inner peripheral surface and the peripheral surface of the column of the lid material and the inner peripheral surface of the cylinder that is the lid material fitting portion are fitted to each other so that the center line of the column of the lid material matches the center line of the cylinder. after the other end face of the pillars of the lid member is placed on the mounting portion cover member so as to, by b-ring caulking, adhesion to the plane of the cut portion of the lid member and the inner peripheral surface of the cylindrical The end opening edge of the cylinder protruding outward from one end face of the lid member in a direction approaching the center line of the cylinder, and the bent end opening edge is by close contact with the end face, that the lid member is fixed to the inner end opening of the cylinder so as not to rotated about the center line And butterflies.

Method for producing a shock absorber according to the invention of claim 2 is a method of manufacturing the shock absorber to produce a shock absorber using the method of fixing the cover material according to claim 1, the inner tube that is formed into a cylindrical The opening at the other end of the outer tube is closed so that one end of the inner tube does not come out of the inner side of the outer tube by being inserted into the inner side of the outer tube through the opening at the other end of the outer tube formed in a cylindrical shape on one end side. As a result, the inner tube and the outer tube are configured to be movable in the direction along the center line of the cylinder, respectively, and the lid is placed inside the other end opening side of the inner tube or inside the one end opening side of the outer tube. forming a Zaino portion and the lid member fitting part, the lid member is inserted from one end opening of the other end opening or the outer tube of the inner tube inside of the opening side, the lid A cylindrical inner peripheral surface is a circumferential surface and the lid engaging portion of the pillar of the lid with a gap is formed between the cylinder inner peripheral surface is a plane and the lid engaging portion formed on the peripheral surface of the pillar Is fitted and the other end surface of the lid column is placed on the lid placing part so that the center line of the lid pillar coincides with the center line of the cylinder, and then by rolling caulking, The other end opening edge of the inner tube or one end opening of the outer tube that protrudes outward from one end face of the lid member without closely contacting the inner peripheral surface of the cylinder and the flat surface of the notch portion of the lid member by edge is crimped so as to be in close contact with one end surface of the lid member, the lid member is a shock absorber is manufactured is fixed to the inside of the one end opening side of the other end opening side or the outer tube of the inner tube It is characterized by.

According to the first aspect of the present invention, the lid can be fixed to the inside of the end opening side of the cylinder so that the lid does not rotate with a small number of man-hours.

According to the second aspect of the present invention, it is possible to manufacture a shock absorber in which the lid member is fixed to the other end opening side of the inner tube or the inner end opening side of the outer tube so that the lid member does not rotate with less man-hours.

Sectional drawing which shows a cylinder. The perspective view which shows a cover material. Process drawing which shows the fixing method of a cover material. The perspective view which shows a cover material. Process drawing which shows the fixing method of a cover material. The half sectional view which shows an example of the front fork manufactured using the fixing method of a cover material.

  Hereinafter, the present invention will be described in detail through embodiments of the invention. However, the following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are included in the invention. It is not necessarily essential to the solution, but includes a configuration that is selectively adopted.

Embodiment 1
First, the configuration of the cylinder and the lid used for the lid fixing method for fixing the columnar lid on the inside of the end opening side of the cylinder will be described.
As shown in FIG. 1, the cylinder 1 is formed such that the inner peripheral diameter a on the end opening 1a side of the cylinder is larger than the inner peripheral diameter dimension b on the central side 1b of the cylinder. A lid material mounting portion 1c formed by a step portion between the inner peripheral surface of the cylinder and the inner peripheral surface of the cylinder 1b, and a lid material fitting portion 1d formed by the inner peripheral surface of the end opening 1a. With.
For example, in a cylinder having the same outer diameter, the inner peripheral surface of the cylinder 1 on the end opening 1a side is cut so that the thickness of the cylinder on the end opening 1a side is the thickness of the cylinder on the center side 1b of the cylinder 1 A stepped portion that becomes the lid material placement portion 1c is formed by being formed thinner than the size. The lid material placement portion 1c is formed by, for example, an annular plane centering on the center line 1e of the cylinder 1 (an annular plane orthogonal to the center line 1e of the cylinder 1).
The lid fitting portion 1d is formed by a cylinder inner peripheral surface on the end opening 1a side set to a diameter corresponding to a cylinder outer diameter of a lid 2 described later formed in a column shape.

  As shown in FIG. 2, the lid member 2 is formed in a columnar shape, and a boundary edge 2 c that is a boundary between the column circumferential surface 2 a and one end surface 2 b of the column is formed on one of the column circumferential surface 2 a and one column. In this configuration, a cutout portion 3 extending to the end surface 2b is formed. For example, a plurality of the notches 3 are formed at regular intervals in the direction along the circumference of the boundary edge 2c. In addition, the shape of the notch part 3 is not specifically limited, A recessed part as shown in FIG. 2 may be sufficient, and a plane may be sufficient. It is sufficient that at least one notch 3 is provided.

Next, a method for fixing the lid member will be described with reference to FIG.
The lid member 2 is inserted from the end opening 1a of the cylinder 1 to the inside of the end opening 1a side, and the cylinder inner peripheral surface which is the circumferential surface 2a of the column of the lid member 2 and the lid member fitting portion 1d of the cylinder 1 And the other end face 2d of the column of the lid material 2 is placed on the lid material placement portion 1c so that the center line 2e of the column of the lid material 2 and the center line 1e of the cylinder 1 coincide ( (See FIG. 3 (a)). In addition, the length dimension d of the direction along the centerline 1e from the cover material mounting part 1c of the cylinder 1 to the edge opening edge 1f is one of the cover materials 2 mounted on the cover material mounting part 1c. It is set longer than the length dimension e between the end surface 2b and the other end surface 2d. Therefore, in the state where the lid member 2 is placed on the lid member placing portion 1c, the end opening edge 1f of the cylinder 1 is more outward than the one end surface 2b of the lid member 2 (the upper side shown in FIG. 3A). Protruding in the direction).
Thereafter, the end opening edge 1f of the cylinder 1 protruding outward from the one end surface 2b of the lid member 2 is pressed so as to be in close contact with the one end surface 2b of the lid member 2 by rolling caulking with a rolling caulking machine. The lid 2 is fastened to the inside of the cylinder 1 on the end opening 1a side.

The rolling caulking machine rotates, for example, a caulking die 4 (see FIG. 3A), an unillustrated actuator that supports the caulking die 4 so as to be swingable, and the cylinder 1 about a center line 1e as a rotation center. An unillustrated rotation support mechanism for supporting the actuator, an unillustrated drive source for the rotation support mechanism, and an unillustrated control means for controlling the actuator and the rotation support mechanism are provided.
The caulking die 4 includes, for example, a forming die portion 4d formed by a recess extending in the direction of the other end surface 4c of the column from an opening edge 4b opened on one end surface 4a of the column of the columnar block body 4A. The shaft portion insertion hole 4e is formed by a through-hole penetrating the bottom of the recess forming the mold portion 4d and the other end surface 4c of the column.
The mold portion 4d includes a circular inner peripheral surface 4f of a cylindrical recess hollowed in a columnar shape that can surround the outer peripheral surface on the end opening 1a side of the cylinder 1 in which the lid member 2 is fitted, and a lid member. 2 is provided with a bottom surface 4g of a concave portion that comes into contact with the end opening edge 1f of the cylinder 1 in which 2 is fitted to bring the end opening edge 1f into close contact with one end surface 2b of the lid 2. The shaft portion insertion hole 4e is formed by a through-hole having a circular cross section that matches the center line 4h of the molding die portion 4d whose center line is the center line of the cylindrical recess.

  The control means controls the actuator and the rotation support mechanism, so that the actuator has the cylinder 1 in a state where the center line 4h of the mold part 4d of the caulking die 4 and the lid material 2 are placed on the lid material placing part 1c. From the state in which the center line 1e coincides with the center line 1e, the caulking mold 4d so that the mold part 4d performs a swinging motion in which the center line 4h of the mold part 4d is inclined by a predetermined angle with respect to the center line 1e of the cylinder 1. , The caulking die 4 is moved to the end opening 1a side of the cylinder 1 and the rotation support mechanism rotates the cylinder 1 about the center line 1e of the cylinder 1 as a rotation center. Thereby, the circular inner peripheral surface 4f of the mold part 4d that performs the rocking motion is brought into contact with the end opening edge 1f of the cylinder 1, and the end opening edge 1f is bent in a direction approaching the center line 1e of the cylinder 1, Further, the bent end opening edge 1f comes into contact with the bottom surface 4g of the recess and is pressed in the direction toward the one end face 2b of the lid member 2 so that the end opening edge 1f is brought into contact with the one end face 2b of the lid member 2. Rolling caulking is performed so as to be in close contact (see FIG. 3B: FIG. 3C).

  As shown in FIG. 2 and FIG. 3, the caulking die 4 has a shaft 5 (a central axis having a columnar shape whose center line is the same as the center line of the cover material) 5 on which the cover material 2 protrudes from one end surface 2 b. When the shaft is passed through the central through hole penetrating the one end surface 2b and the other end surface 2d of the lid member 2, these shafts may be used through the shaft insertion hole 4e. Even if there is no, you can use it as it is. If these shafts are not provided, a caulking die that does not include the shaft portion insertion hole 4e can be used.

  In the first embodiment, the lid member 2 extends to the boundary edge 2c, which is the boundary between the column circumferential surface 2a and the column end surface 2b, to the column circumferential surface 2a and the column end surface 2b. 3, when the above-described rolling caulking process is performed, the bent portion of the end opening edge 1f pressed by the molding die portion 4d enters into the cutout portion 3 and closely contacts to rotate the center line 2e. Since the concave / convex engaging portion that prevents the rotation of the lid member 2 at the center is formed, the lid member 2 is placed inside the end opening 1a side of the cylinder 1 so that the lid member 2 does not rotate only by rolling caulking. Can be fixed.

Therefore, according to the fixing method of the lid member according to the first embodiment, the lid member 2 can be fixed to the inner side of the end opening 1a side of the cylinder 1 so that the lid member 2 does not rotate only by rolling caulking. As in the lid fixing method shown in Patent Document 1, it is not necessary to separately perform rolling caulking and anti-rotation caulking, and the number of processing steps can be reduced.
Furthermore, since only one or more notches 3 are provided on the boundary edge 2c which is a boundary between the circumferential surface 2a of the column of the lid 2 and the one end surface 2b of the column, the material processing is disclosed in Patent Document 1. Compared to the method of fixing the lid shown, the number of material processing can be reduced.
Therefore, according to the lid fixing method according to the first embodiment, the processing cost can be reduced as compared with the lid fixing method disclosed in Patent Document 1, and the lid 2 is cylindrical so that the lid 2 does not rotate. 1 can be fixed to the inside of the end opening 1a side.

Moreover, in the case of the fixing method of the lid | cover material shown by patent document 1, since several recessed part is formed in the outer peripheral surface of a cylinder, there exists a possibility that the appearance on the external appearance of a cylinder may be impaired.
On the other hand, according to the fixing method of the lid member according to the first embodiment, it is not necessary to perform processing that impairs the appearance of the cylinder 1 on the outer peripheral surface of the cylinder 1, and thus the appearance of the cylinder 1 is impaired. The risk of worries can be reduced.

Embodiment 2
In the first embodiment, as the lid member 2, the lid member 2 including one or more notch portions 3 on the boundary edge 2 c that is a boundary between the circumferential surface 2 a and the one end surface 2 b is used. You may use the cover material 2A of the structure formed so that it might extend to one end surface 2b and the other end surface 2d.
For example, as shown in FIG. 4, a peripheral surface 2m in which a flat surface 3A as a notch portion 3 extending to one end surface 2b and the other end surface 2d is formed on a part of the peripheral surface of the column of the lid member. The cover member 2A having the provided structure is used.

Next, a method for fixing the lid member will be described with reference to FIG.
The lid member 2A is inserted from the end opening 1a of the cylinder 1 into the inside of the end opening 1a side, and the peripheral surface of the column of the lid member 2A and the cylinder inner peripheral surface which is the lid member fitting portion 1d of the cylinder 1 are formed. The other end surface 2d of the column of the lid member 2A is placed on the lid material placing portion 1c so that the center line 2e of the column of the lid member 2A and the center line 1e of the cylinder 1 coincide with each other (FIG. 5). (See (a)). In this case, a gap 7 is generated between the flat surface 3A formed on the peripheral surface 2m of the lid member 2A and the inner peripheral surface of the cylinder 1 on the end opening 1a side.
Then, by performing the rolling caulking process as described above, the circular inner peripheral surface 4f of the mold part 4d that performs the rocking motion comes into contact with the end opening edge 1f of the cylinder 1, and the end opening edge 1f becomes When bent in a direction approaching the center line 1e of the cylinder 1, the inner peripheral surface of the cylinder 1 and the flat surface 3A of the lid member 2A are in close contact, and the bent end opening edge 1f contacts the concave bottom surface 4g. Then, it is pressed in the direction toward the one end surface 2b of the cover member 2A, and is rolled and crimped so that the end opening edge 1f is in close contact with the one end surface 2b of the cover member 2A (see FIG. 5B). .

In the second embodiment, since the cover member 2A formed by the flat surface 3A in which the cutout portion 3 extends to the one end surface 2b and the other end surface 2d is used, when the above-described rolling caulking process is performed, the mold part As the end opening edge 1f is pressed by 4d, the inner peripheral surface of the cylinder 1 and the flat surface 3A of the lid member 2A come into close contact with each other, thereby preventing the lid member 2A from rotating about the center line 2e. Since the concave-convex engaging portion is formed, the lid member 2A can be fixed inside the end portion opening 1a of the cylinder 1 so that the lid member 2A does not rotate only by rolling caulking.
When the inner peripheral surface of the cylinder 1 and the flat surface 3A of the lid 2A are brought into close contact with each other, the outer shape of the cylinder 1 becomes an irregular shape, so that the outer shape of the cylinder 1 does not become an irregular shape. By performing the rolling caulking process, the inner peripheral surface of the cylinder 1 and the flat surface 3A of the lid member 2A may be firmly crimped and fixed so that the lid member 2A does not rotate.

  Therefore, according to the fixing method of the lid material according to the second embodiment, as in the fixing method of the lid material according to the first embodiment, the lid material 2A is attached to the cylinder 1 so that the lid material 2A does not rotate only by rolling caulking. Since it can be fixed to the inner side of the end opening 1a side, there is no need to separately perform rolling caulking and anti-rotation caulking as in the lid fixing method shown in Patent Document 1, and man-hours can be reduced. Can be reduced.

  As is apparent from the above gist, in the lid fixing method of the present invention, rolling is performed by using a cylindrical lid member provided with a notch extending to the peripheral surface of the column and one end surface of the column. Since the concave / convex engagement part that prevents the rotation of the lid centering on the center line is formed only by caulking, the lid is opened to the end of the cylinder so that the lid does not rotate with less man-hours. Can be fixed inside.

Embodiment 3
Hereinafter, a method of manufacturing a hydraulic shock absorber such as a front fork as an example of a shock absorber using the above-described lid fixing method will be described.
A front fork used in a motorcycle has one end of an inner tube formed in a cylinder inserted into the outer tube via an opening in the other end of the outer tube formed in a cylinder, and one end of the inner tube is outer. The inner tube and the outer tube are configured to be movable in the direction along the center line of the cylinder by closing the opening at the other end of the outer tube so as not to come out from the inside of the tube. When the inner tube and the outer tube move in the direction in which the outer tube and the other end of the outer tube are moved, and the inner tube and the outer tube move in the direction in which the one end of the inner tube is separated from the other end of the outer tube. The inner and outer tubes It is configured to generate a damping force for damping.
As a front fork, an upright type in which the other end portion of the inner tube is attached to the vehicle body via a member called an upper bracket and one end portion of the outer tube is attached to an axle of the front wheel via a member called an axle bracket, There is an inverted type in which one end portion of the outer tube is attached to the vehicle body via a member called an upper bracket and the other end portion of the inner tube is attached to the axle of the front wheel via a member called an axle bracket.
The opening at the other end of the inner tube that is attached to the vehicle body in the upright type front fork or the opening at the one end of the outer tube that is attached to the vehicle body in the inverted type front fork is blocked. A lid (cap) is attached.

For example, as a configuration for connecting and fixing the front fork and the upper bracket, the upper bracket is provided so as to close the other end opening of the inner tube or the one end opening of the outer tube which is an end opening on the side connected to the upper bracket. The bolt is placed on the lid, and the bolt is passed through the through hole for bolt passage formed in the upper bracket and formed on the lid so as to extend from the outer surface of the lid toward the inside of the front fork. The structure is known in which the upper bracket is sandwiched between the head of the bolt and the lid member and the front fork and the upper bracket are connected and fixed by being fastened to the female screw portion (for example, (See Japanese Utility Model Publication No. 60-142180).
In the connection and fixing structure, when the cover member is screwed to the inner peripheral surface of the end opening on the side connected to the upper bracket of the front fork, the cover member also rotates together when the bolt is fastened. In other words, a so-called co-rotation phenomenon may occur.

Also, the spring load adjustment adjuster for adjusting the initial load of the suspension spring provided in the front fork has the other end opening of the inner tube or the outer tube serving as the end opening of the front fork connected to the upper bracket. There is known a configuration in which a lid member provided at one end opening of the door is rotatably provided (see, for example, JP-A-2005-9541).
Even in the configuration provided with the spring load adjustment adjuster, the spring load adjustment adjuster was rotated when the cover member was screwed to the inner peripheral surface of the end opening on the side connected to the upper bracket of the front fork. In some cases, a so-called co-rotation phenomenon may occur in which the lid member rotates together.

  Therefore, in order to prevent the above-mentioned co-rotation phenomenon, use the above-described lid fixing method when caulking and fixing the lid inside the end opening on the side connected to the upper bracket of the front fork. The lid can be fixed inside the end opening side of the inner tube or outer tube so that the lid does not rotate only by rolling caulking, and the inner side of the end opening side of the inner tube or outer tube can be fixed inside. It is possible to manufacture a hydraulic shock absorber such as a front fork fixed so that the cover member does not rotate.

  Further, a solenoid case (cylinder) and a flange (cover material) of a hydraulic shock absorber as disclosed in FIG. 6 of Patent Document 1 (Japanese Patent Laid-Open No. 2009-262203) described above, and a head (cover material) of a piston bolt. And the fixing method of the lid material described above in the fixing portion between the tube (cylinder) of the hydraulic shock absorber disclosed in FIG. 8 of Patent Document 1 and the metal ring (lid material) provided in the oil seal. By using, the lid can be fixed inside the end of the cylinder of the hydraulic shock absorber so that the lid does not rotate only by rolling caulking. It is possible to manufacture a hydraulic shock absorber that is fixed so that the lid member does not rotate inside the opening side of the end portion.

  That is, one end side of the inner tube formed in the cylinder is inserted into the outer tube through the opening of the other end of the outer tube formed in the cylinder so that one end of the inner tube does not come out from the inner side of the outer tube. When the opening at the other end of the outer tube is closed, the inner tube and the outer tube are configured to be movable in the direction along the center line of the cylinder, and the oil flow path is provided inside the outer tube and the inner tube. Pressure resistance caused when oil flows through the oil flow path when the outer tube and the inner tube move in a direction along the center line. Manufactures hydraulic shock absorbers configured to generate a damping force that damps the movement of the outer tube and inner tube due to loss A step of forming the above-described lid material mounting portion and lid material fitting portion on the inner side of the other tube opening side of the inner tube or the inner side of the outer tube one end opening side, and the lid material From the other end opening of the inner tube or the one end opening of the outer tube to the inside of the opening side, the peripheral surface of the column of the cover material and the inner peripheral surface of the cylinder which is the cover material fitting portion of the inner tube or the outer tube Placing the other end face of the lid material column on the lid material placement part so that the center line of the lid material column and the center line of the inner tube or the outer tube cylinder coincide with each other, and the lid The other end opening edge of the inner tube or the one end opening edge of the outer tube protruding outward from one end surface of the material is swaged so as to be in close contact with the one end surface of the lid material by rolling caulking. Material In the manufacturing method of the hydraulic shock absorber provided with the step of fixing to the inside of the other end opening side of the outer tube or the one end opening side of the outer tube, by using the lid member provided with the above-described notch as the lid member, With a small number of man-hours, it is possible to manufacture a hydraulic shock absorber in which the lid member is fixed to the other end opening side of the inner tube or the inner end opening side of the outer tube so that the lid member does not rotate.

  Hereinafter, an example of a front fork provided with an inner tube manufactured by using the lid fixing method of the present invention will be described with reference to FIG. In the following description, the sides indicated by arrows in FIG. 6 are defined as one end side and the other end side.

The front fork 10 has an oil passage and a passage resistance provided in the oil passage on the inside, and the outer tube 11 and the rod of the inner tube 12 move in a direction along the center line 10A. The hydraulic shock absorber is configured to generate a damping force that attenuates the movement of the outer tube 11 and the inner tube 12 due to pressure loss due to flow path resistance when oil flows through the oil flow path.
A front fork 10 used in a motorcycle or the like has one end side of a cylindrical inner tube 12 inserted into the inside of a cylindrical outer tube 11 whose one end is closed and the other end is opened, and the inner tube 12 and the outer tube 11 are inserted through the opening. Are configured to be movable in a direction along the center line 10A of the cylinder.
A guide bush 13, a seal spacer 14, an oil seal 15, a stopper ring 16, a dust seal 17, and a case cover 18 are provided at the other end opening of the outer tube 11 where the inner tube 12 is inserted. The inner tube 12 is inserted through the central through-holes of these members so as not to come out from the inner side of the outer tube 11 and to be liquid-tight. A slide bush 20 is provided on the outer peripheral portion of one end inserted into the outer tube 11 of the inner tube 12.
A bolt 21 is provided so as to protrude from the bottom of the outer tube 11 to the inside of the outer tube 11, and a hollow pipe 22 having one end screwed to the bolt 21 is disposed inside the outer tube 11. The hollow pipe 22 is provided with an enlarged diameter portion 22a at the other end, and the enlarged diameter portion 22a is in sliding contact with the inner peripheral surface of the inner tube 12 via a piston ring 22c fitted in an annular groove 22b on the outer periphery of the enlarged diameter portion 22a. . The hollow pipe 22 defines an oil chamber S on the outside and an oil reservoir chamber R including an oil chamber R1 and an upper gas chamber R2 on the inside.
A cap bolt as the lid member 2 is fixed to the other end opening of the tube of the inner tube 12 by the above-described lid member fixing method.
One end of a suspension spring 24 provided inside the inner tube 12 is supported by the enlarged diameter portion 22 a of the hollow pipe 22, and the other end of the suspension spring 24 is supported by the lid member 2 via a washer 25 and a spring collar 26. Yes.
A step portion 12 a is formed on the inner periphery of one end portion of the inner tube 12, and a valve seat member including a valve stopper 30, a spacer 31, and an oil lock collar 32 is sequentially stopped against the step portion 12 a, and one end of the inner tube 12 is The parts are crimped to secure them.
A tapered valve seat surface 32 a is formed on the other end side of the inner periphery of the oil lock collar 32, and an annular free valve 33 is provided between the valve seat surface 32 a and the valve stopper 30. The free valve 33 is provided so as to be movable to one end side and the other end side of the hollow pipe 22 through an annular gap between the free valve 33 and the outer periphery of the hollow pipe 22. A plate spring 41 fixed to the spacer 31 is provided on the other end side of the free valve 33, and this plate spring 41 urges the free valve 33 toward the tapered valve seat surface 32a. The valve stopper 30 includes an oil passage 30b.
The oil lock collar 32 partitions the oil chamber S provided outside the hollow pipe 22 into the other end side oil chamber S1 and the one end side oil chamber S2. Further, a plurality of through holes 40 are provided on one end side of the hollow pipe 22, and the one end side oil chamber S outside the hollow pipe 22 and the oil reservoir chamber R inside the hollow pipe 22 are connected via the plurality of through holes 40. Is configured to communicate. A plurality of orifice holes 35 are provided on the other end side of the hollow pipe 22, and an oil chamber S outside the hollow pipe 22 and an oil reservoir chamber R inside the hollow pipe 22 are connected via the plurality of orifice holes 35. It is configured to communicate.
Between the valve stopper 30 and the enlarged diameter portion 22 a of the hollow pipe 22, a rebound spring 36 that performs a buffering function when the front fork 10 is fully extended is provided. An oil lock piece 37 is provided between one end side of the hollow pipe 22 and one end portion of the outer tube 11, and the oil lock piece 37 is one end side of the oil lock collar 32 when the front fork 10 is compressed most. The buffer function at the time of the most compression is fulfilled by acting so as to confine the hydraulic oil.
The oil lock collar 32 is provided with a hole 32b, and the inner tube 12 is provided with a hole 12b in the portion where the oil lock collar 32 is provided.
Then, the oil in the oil chamber S is supplied to the guide bush 13 of the outer tube 11, the slide bush 20 of the inner tube 12, and the space S3 between the outer tube 11 and the inner tube 12 sandwiched between the guide bush 13 and the slide bush 20. Then, lubrication of the guide bush 13 and volume compensation of the space S3 between the tubes 11 and 12 are performed.

  In the front fork 10 configured as described above, for example, the other end of the inner tube 12 is attached to the motorcycle body via the bracket 100, and one end of the outer tube 11 is not shown via the attachment hole 105. By being mounted on the axle bracket of the motorcycle, it is mounted on the axle of the front wheel of the motorcycle. In this case, as a configuration for connecting and fixing the front fork 10 and the bracket 100, the bracket 100 is provided so as to close the other end opening of the inner tube 12 serving as an end opening on the side connected to the bracket 100. Mounted on the lid member 2, the shaft portion 5 of the lid member 2 is fitted into the shaft portion fitting hole 103 formed in the lower surface of the bracket 100, and the bolt 102 is formed in the bracket 100. The bracket 100 is fastened to a female screw portion 104 formed on the lid member 2 so as to extend from the outer surface of the shaft portion 5 toward the inside of the front fork 10 while being passed through the through hole 101 of the shaft portion 5. The front fork 10 and the bracket 100 are connected and fixed with each other.

In the state where the front fork 10 is attached to the motorcycle, when the inner tube 12 and the outer tube 11 move in a direction in which one end of the inner tube 12 and the other end of the outer tube 11 are separated, the oil lock collar 32 is compressed. Since the pressure in the one end side oil chamber S2 on one end side increases and the free valve 33 bends the leaf spring 41 and moves to the other end side, the space between the free valve 33 and the valve seat surface 32a of the oil lock collar 32 is increased. The oil flow path is opened. At this time, the oil in the one end side oil chamber S2 passes through the oil passage between the free valve 33 and the valve seat surface 32a, and further passes through the oil passage 30b of the valve stopper 30 to the side of the other end side oil chamber S1. Replace with. Further, the oil corresponding to the cross-sectional area of the inner tube 12 × stroke moves from the one end side oil chamber S2 to the inner oil reservoir chamber R through the through hole 40 on one end side of the hollow pipe 22. And the damping force at the time of compression generate | occur | produces by the passage resistance when oil passes the through-hole 40. FIG.
Further, at the time of the most compression, the oil lock collar 32 is fitted to the outer periphery of the oil lock piece 37 provided on the outer periphery on one end side of the hollow pipe 22 through a minute gap so as to confine the oil on one end side of the oil lock collar 32. To buffer at the time of maximum compression.

Further, when the inner tube 12 and the outer tube 11 move in a direction in which one end of the inner tube 12 and the other end of the outer tube 11 approach each other, the other end-side oil chamber S1 on the other end side of the oil lock collar 32. The free valve 33 is seated on the valve seat surface 32 a of the oil lock collar 32 due to the increase in pressure and the urging force of the plate spring 41. The oil in the other end side oil chamber S1 moves from the annular gap between the inner periphery of the free valve 33 and the hollow pipe 22 to the one end side oil chamber S2. The other oil flows into the oil reservoir chamber R inside the hollow pipe 22 through the orifice hole 35 formed in the upper part of the hollow pipe 22. The passage resistance when the oil in the other end side oil chamber S1 passes through the annular clearance on the inner periphery of the free valve 33, and the oil in the other end side oil chamber S1 moves from the orifice hole 35 of the hollow pipe 22 to the oil reservoir chamber R. In this case, a damping force due to the passage resistance generated in the orifice hole 35 is generated.
At the time of extension, oil corresponding to the cross-sectional area of the inner tube 12 × stroke is supplied from the oil reservoir chamber R to the one-end side oil chamber S2.

Embodiment 4
In the above, as an example of the shock absorber, one end side of the inner tube formed in the cylinder is inserted into the outer tube through the opening of the other end of the outer tube formed in the cylinder, and one end of the inner tube is the outer tube The inner tube and the outer tube are configured to be movable in the direction along the center line of the cylinder by closing the opening at the other end of the outer tube so as not to come out from the inner side of the outer tube, and the outer tube and the inner tube. The oil flow path and the flow resistance provided in the oil flow path are provided inside the tube, and the oil flows through the oil flow path when the outer tube and the inner tube move in the direction along the center line. A damping force that attenuates the movement of the outer tube and the inner tube is generated by pressure loss due to flow path resistance. It has been has been described hydraulic shock absorber, the method of fixing the cover material according to the present invention can be applied in manufacturing the shock absorber without using a hydraulic like grease slide type friction damper.
That is, when the outer tube and the inner tube move in the direction along the center line, the movement of the outer tube and the inner tube is caused by the frictional resistance when the outer peripheral surface of the inner tube and the inner peripheral surface of the outer tube slide. The other end opening of the inner tube when manufacturing a shock absorber configured to apply a grease between the outer peripheral surface of the inner tube and the inner peripheral surface of the outer tube. The lid material placement portion and the lid material fitting portion described above are formed on the inner side of the side or on the inner side of the one end opening side of the outer tube, and the lid material is the other end opening of the inner tube or the one end opening of the outer tube. The inner peripheral surface of the cylinder that is the lid member fitting portion of the inner tube or the outer tube is fitted to the inner side of the opening side from Then, after the other end surface of the lid column is placed on the lid placement part so that the center line of the lid column coincides with the center line of the inner tube or the outer tube cylinder, The other end opening edge of the inner tube projecting outward from one end face or the one end opening edge of the outer tube is crimped so as to be in close contact with one end face of the lid member by rolling caulking, so that the lid member is When manufacturing a shock absorber fixed inside the other end opening side of the inner tube or the one end opening side of the outer tube, by using a lid member provided with a notch portion according to the present invention as a lid member, with less man-hours, A shock absorber in which the lid member is fixed on the other end opening side of the inner tube or the inner end opening side of the outer tube so that the lid member does not rotate can be manufactured.

1 cylinder, 1a end opening, 1c lid material placement part, 1d lid material fitting part,
1e Cylinder center line, 2 Lid material, 2a Circumferential surface (circumferential surface) of the lid material,
2b one end surface of the lid member, 2c boundary edge, 2d the other end surface of the lid member,
2e Center line of cover material, 3 notch, 3A plane (notch),
10 Front fork (buffer),
11 outer tube, 12 inner tube.

Claims (2)

The lid material is placed inside the end opening side of the cylinder so that the center line of the cylinder forming the inner tube or the outer tube of the front fork used in a motorcycle coincides with the center line of the columnar lid material. A lid fixing method for fixing the lid material to the inside of the end opening side of the cylinder so that the lid material does not rotate with the center line as a rotation center.
The cylinder is formed such that the inner peripheral diameter dimension on the end opening side of the cylinder is larger than the inner peripheral diameter dimension on the center side of the cylinder. A lid material placement portion formed by an annular flat surface centered on the center line of the cylinder, which is a step portion with respect to the surface, and a lid material fitting portion formed by a cylinder inner peripheral surface on the end opening side Configured
The lid member includes a notch formed by a flat surface in which the peripheral surface of the column extends to one end surface of the column and the other end surface of the column ,
The lid member is inserted from the end opening of the cylinder to the inside of the end opening side, and a plane formed on the peripheral surface of the column of the lid member and a cylinder inner peripheral surface which is the lid member fitting portion A gap is formed between the peripheral surface of the column of the lid member and the inner peripheral surface of the cylinder that is the lid member fitting portion so that the center line of the column of the lid member coincides with the center line of the cylinder. after the other end face of the pillars of the cover member is mounted to the lid member mounting portion as by b-ring caulking, and a plane of the cut portion of the lid member and the inner peripheral surface of the cylindrical The end opening edge of the cylinder that protrudes outward from one end face of the lid member without being in close contact is bent in a direction approaching the center line of the cylinder, and the bent end opening edge is by close contact with one end face of the lid, the circular so that the lid member is not rotated about the center line Fixing method of the cover member, characterized in that it is fixed to the inside of the end opening. A shock absorber manufacturing method for manufacturing a shock absorber using the lid fixing method according to claim 1 ,
The outer tube is inserted so that one end side of the inner tube formed in the cylinder is inserted into the outer tube through the opening of the other end of the outer tube formed in the cylinder so that one end of the inner tube does not come out from the inner side of the outer tube. When the opening at the other end of the inner tube is closed, the inner tube and the outer tube are configured to be movable in the direction along the center line of the cylinder, respectively. The lid material placement portion and the lid material fitting portion are formed on the inner side of the one end opening side, and the lid material is located on the inner side of the opening side from the other end opening of the inner tube or the one end opening of the outer tube. are inserted, the pillars of the lid with a gap is formed between the cylinder inner peripheral surface is a plane formed on the peripheral surface of the pillar of the lid said lid engaging portion The other end face of the column of the lid member is fitted so that the inner peripheral surface of the cylinder as the lid member fitting portion fits and the center line of the column of the lid member coincides with the center line of the cylinder After being placed on the lid material placement portion, by rolling caulking, the inner peripheral surface of the cylinder and the flat surface of the notch portion of the lid material are not brought into close contact with each other , and one end surface of the lid material the by one end opening edge of the other end opening edge or outer tube of the inner tube is crimped so as to be in close contact with one end surface of the front Kifutazai, the lid member is the inner tube projecting outward than The shock absorber is manufactured by being fixed to the other end opening side or the inner end opening side of the outer tube.

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