JP2007154977A - Cylinder device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylinder device which prevents a wrong insertion when attaching a spring seat. <P>SOLUTION: The cylinder device comprises a jacket 7 having a spring seat fixing part 21, and a spring seat 28 having an engaging part 25 engaged with the spring seat fixing part 21. The spring seat fixing part 21 has at least one positioning projection 20 projecting radially outward. The engaging part 25 has at least one positioning recess 24 engaged with both the circumferential side surfaces of the positioning projection 20 to restrict the movement to both the circumferential sides of the spring seat 28. The positioning projection 20 and the positioning recess 24 are provided in the spring seat fixing part 21 and the engaging part 25 respectively so that the spring seat 28 and the outer jacket 7 are fitted in only one circumferential position. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cylinder device such as a shock absorber mounted on a vehicle such as an automobile, and more particularly to a cylinder device engaged with a spring seat.

  Some shock absorbers mounted on a cylinder device, for example, a suspension device of an automobile, have a spring seat for receiving a suspension spring fixed (or engaged). In the case of a so-called twin tube type shock absorber, the spring seat is fixed (or engaged) to an outer shell (outer cylinder). Conventionally, in this type of shock absorber, the spring seat has been fixed by welding, but there are problems such as mixing of welding residue caused by welding and deformation of the outer shell due to heat.

  Several proposals have been made to solve these problems. An opening is formed in the spring seat, a convex portion is formed on the outer periphery of the outer shell, and the spring seat is fixed by rotation and engagement thereof (Patent Document 1) and the non-sliding region of the piston in the outer shell. For example, a convex portion is formed along the direction, and a spring seat is press-fitted and fixed therein (Patent Document 2).

  However, in the above structure, when the spring seat is engaged and press-fitted into the outer shell, the circumferential positioning of the spring seat with respect to the outer shell is performed by a method such as visual observation. was there. In particular, when the shock absorber body and the spring seat are transported separately in order to increase the transportation efficiency, an operator who is unfamiliar with the fixing (or engagement) of the spring seat (for example, the worker at the delivery destination) fixes the spring seat. In some cases, the spring seat could be inserted in the wrong direction.

JP 7-280018 A JP2005-291302

  The present invention has been made in view of such problems, and an object of the present invention is to provide a cylinder device that prevents erroneous insertion when a spring seat is attached.

  According to the first aspect of the present invention, there is provided an outer cylinder having a rod that extends in a telescopic manner, a spring seat fixing portion provided on an outer peripheral portion of the outer cylinder, and an engaging portion that engages with the spring seat fixing portion. The spring seat fixing part has a positioning convex part protruding outward in the radial direction, and the engaging part is provided on both sides in the circumferential direction of the positioning convex part. At least one positioning recess that engages a surface and restricts the movement of the spring seat in both circumferential directions, and the positioning projection and the positioning recess have a single circumference of the spring seat and the outer cylinder. The cylinder device is provided in each of the spring seat fixing portion and the engaging portion so as to be fitted only in the direction position.

  According to a second aspect of the present invention, there is provided an outer cylinder having a rod that extends in a telescopic manner, a spring seat fixing portion provided on an outer peripheral portion of the outer cylinder, and an engaging portion that engages with the spring seat fixing portion. The spring seat fixing part has a positioning convex part protruding outward in the radial direction, and the engaging part is provided on both sides in the circumferential direction of the positioning convex part. A positioning recess that engages a surface and restricts movement of the spring seat to both sides in the circumferential direction, and the positioning projection is an outer peripheral portion of a radial section of the spring seat fixing portion at the position of the positioning projection The cylinder device is provided in the spring seat fixing portion so as to have one-time rotational symmetry.

  Invention of Claim 3 is a cylinder apparatus of Claim 1 or 2, Comprising: The said spring seat fixing | fixed part protrudes in the radial direction outer side from the said outer cylinder, and contacts at least with the said spring seat in an axial direction. It is a cylinder device characterized by having one fixing projection.

  A fourth aspect of the present invention is the cylinder device according to the third aspect, wherein the spring seat is formed so as to be engaged with the outer cylinder by inserting the outer cylinder, and the positioning projection is inserted at the time of insertion. The positioning convex portion is provided so that the positioning convex portion comes into contact with any part of the spring seat before the fixing convex portion when the circumferential position of the portion and the engaging portion are different. It is a cylinder apparatus characterized by this.

  The invention according to claim 5 is the cylinder device according to claim 3, wherein the engaging portion has at least one fixing concave portion that engages with the fixing convex portion, and the fixing concave portion. The diameter of the inscribed circle is smaller than the diameter of the circle circumscribed by the fixing convex portion, and the fixing convex portion is press-fitted and fixed in the fixing concave portion when the outer cylinder is inserted into the spring seat. This is a cylinder device.

  A sixth aspect of the present invention is the cylinder device according to any one of the first to fifth aspects, wherein the width of the positioning projection in the insertion direction is smaller than the maximum width of the positioning projection. It is a cylinder device.

  According to the first aspect of the present invention, the spring seat fixing portion has at least one positioning convex portion protruding radially outward, and the engaging portions are provided on both circumferential surfaces of the positioning convex portion. A positioning recess that engages and restricts movement of the spring seat to both sides in the circumferential direction, and the positioning projection and the positioning recess are fitted in only one circumferential position of the spring seat and the outer cylinder. Since the spring seat fixing part and the engaging part are respectively provided so as to match, when attaching the spring seat to the outer cylinder, there is only one position in the circumferential direction that can be attached. Inserting in the direction can be prevented.

  According to the second aspect of the present invention, the spring seat fixing portion has at least one positioning convex portion projecting outward in the radial direction, and the engaging portions are engaged with both circumferential surfaces of the positioning convex portion. And a positioning recess that restricts the movement of the spring seat to both sides in the circumferential direction, and the positioning convex portion has a one-time rotational symmetry in the outer peripheral portion of the radial cross section of the spring seat fixing portion at the position of the positioning convex portion. Thus, since it is provided in the spring seat fixing portion, when attaching the spring seat to the outer cylinder, since there is only one position in the circumferential direction that can be attached, insertion in the wrong direction can be prevented. .

  According to the third aspect of the invention, the spring seat fixing portion has at least one fixing convex portion that protrudes radially outward from the outer cylinder and abuts against the spring seat in the axial direction. The strength in the axial direction can be increased.

  According to the invention described in claim 4, when the positioning convex portion and the engaging portion have different circumferential positions at the time of insertion, the positioning convex portion is placed at any location of the spring seat before the fixing convex portion. In this state, the operator can easily recognize that the spring seat is unstable and the mounting circumferential direction position is different.

  According to the fifth aspect of the present invention, the engaging portion has at least one fixing concave portion that engages with the fixing convex portion, and the diameter of the circle inscribed in the fixing concave portion is the fixing convex portion. It is formed smaller than the diameter of the circumscribed circle, and when the outer cylinder is inserted into the spring seat, the fixing convex part is press-fitted and fixed to the fixing concave part. To do.

  According to the sixth aspect of the present invention, since the width of the leading end portion in the insertion direction of the positioning convex portion is smaller than the maximum width of the positioning convex portion, positioning is easy when the positioning concave portion is inserted into the spring seat.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of a shock absorber according to a first embodiment of the present invention. A piston 4 is slidably inserted into the cylinder 1 with the upper end opened, and the inside of the cylinder 1 is divided into a piston upper chamber 2 and a piston lower chamber 3. One end of a piston rod 5 (corresponding to a rod in the present invention) is fixed to the piston 4, and the other end of the piston rod 5 extends to the outside in the axial direction of the cylinder 1. The piston upper chamber 2 and the piston lower chamber 3 are filled with an oil liquid, and the piston 4 is provided with a piston oil liquid passage 6 through which the oil liquid passes according to the relative movement between the cylinder 1 and the piston rod 5. It has been. At both ends of the piston fluid passage 6, annular piston valves 6A are provided so as to restrict the flow of the fluid and generate a damping force.

  A cylindrical outer shell 7 (corresponding to an outer cylinder in the present invention) having a closed lower end is provided coaxially with the cylinder 1 on the outer peripheral portion of the cylinder 1. The outer shell 7 and the cylinder 1 are fixed via a body portion 17 provided at the lower end portion. The body portion 17 is provided with an oil passage 15 and a body valve 16 that communicate the piston lower chamber 3 and the reservoir chamber 8. A reservoir chamber 8 formed by the inside of the outer shell 7 and the outer peripheral portion of the cylinder 1 communicates with the piston lower chamber 3 through an oil passage 15 and is partially filled with oil. The remaining portion is filled with gas. This gas compensates for the change in the volume of the piston rod 5 in the cylinder 1 as the piston rod 5 enters and exits the cylinder 1. That is, when the piston rod 5 enters the cylinder 1, the gas is compressed by the amount of the intrusion volume, and when the piston rod 5 retreats, it expands to keep the volume inside the cylinder 1 constant.

  The piston rod 5 is restrained from moving in the radial direction by a bush 10 provided on the inner peripheral side of the rod guide 9, and only allowed to move in the axial direction. The bush 10 is a metal cylinder or a fluororesin molded product whose inner peripheral surface that slides with the piston rod 5 is coated with a fluororesin or the like, and has excellent slidability with the piston rod 5. The rod guide 9 includes a small diameter portion 9A and a large diameter portion 9B, and the cylinder 1 is fixed by inserting the small diameter portion 9A into the cylinder 1. The large-diameter portion 9 </ b> B regulates the relative movement in the radial direction between the rod guide 9 and the outer shell 7 by being inserted into the outer shell 7. Further, the axial movement of the rod guide 9 and the outer shell 7 is restricted by caulking the upper end portion of the outer shell 7 radially inward.

  A cap 11 is press-fitted into the upper end portion of the outer shell 7 so as to cover it. The cap 11 is for protecting the oil seal 12.

  Between the rod guide 9 and the cap 11, an oil seal 12 for preventing the oil in the cylinder 1 from leaking to the outside, and a dust strip 13 for preventing dust from the outside from entering the cylinder 1. Are arranged so that the piston rod 5 penetrates them.

  The outer shell 7 has one positioning convex part 20 and five fixing convex parts 22 projecting radially outward on the outer periphery thereof. A spring seat 28 having a positioning concave portion 24 and a fixing concave portion 26 is press-fitted into the positioning convex portion 20 and the fixing convex portion 22. A positioning concave portion 24 is engaged with the positioning convex portion 20, and a fixing concave portion 26 is engaged with the fixing convex portion 22. The positioning convex portion 20 and the fixing convex portion 22 constitute the spring seat fixing portion 21 in the present invention, and the positioning concave portion 24 and the fixing concave portion 26 constitute the engaging portion 25 in the present invention. The positioning convex portion 20 and the fixing convex portion 22 are formed by projecting a part of the outer shell 7 radially outward by a method such as bulge molding, and the positioning concave portion 24 and the fixing concave portion 26 are a part of the spring seat. Is formed by projecting radially outward by a method such as bulge molding.

  In FIG. 2, the fragmentary sectional view of the spring seat 28 and the outer shell 7 of this embodiment is shown. In the drawing, the left side is a spring seat 28, and at the time of assembly, the outer shell 7 on the right side is moved in the direction of the arrow 30 and inserted into the spring seat 28.

  3 is a cross-sectional view of the spring seat 28 shown in FIG. 2 taken along the XX plane in the direction of the arrow. FIG. 4 shows the YY plane of the outer shell 7 shown in FIG. 2 in the direction of the arrow. FIG. As shown in FIGS. 2 to 4, the positioning convex portion 20 and the fixing convex portion 22 of the outer shell 7 are arranged at equal intervals in the circumferential direction. These do not need to be equally spaced, but the received force is dispersed if they are equally spaced.

  The positioning protrusion 20 protrudes radially outward as compared with the fixing protrusion 22. That is, the height in the radial direction is larger than the height of the fixing convex portion 22. On the other hand, the positioning recess 24 of the spring seat 28 has such a shape that the positioning projection 20 just fits therein. That is, the circumferential width at the engagement position of the positioning recess 24 is substantially equal to the circumferential width at the engagement position of the positioning protrusion 20 (actually, a slight gap is provided to facilitate insertion). . The positioning recess 24 is provided with a right rotation restricting portion 27 and a left rotation restricting portion 29. When the spring seat 28 is engaged with the outer shell 7, the right side surface of the positioning convex portion 20 abuts on the right rotation restricting portion 27, so that the outer shell 7 is restricted from rotating in the circumferential direction with respect to the spring seat 28. Similarly, since the left side surface of the positioning convex portion 20 contacts the left rotation restricting portion 29, the outer shell 7 is restricted from rotating left with respect to the spring seat 28. As described above, since there is only a slight gap between the positioning concave portion 24 and the positioning convex portion 20, movement (rotation) of the spring seat 28 in the circumferential direction with respect to the outer shell 7 is restricted.

  The fixing recess 26 is substantially circular in cross section in the radial direction except for the portion where the positioning recess 24 is provided, and has a shape in which the five fixing protrusions 22 are press-fitted and fixed. That is, the inner diameter of the fixing recess 26 is smaller than the diameter of the circle circumscribing the vertices of the five fixing protrusions 22 by the amount of the interference. Here, the holding force (axial direction and circumferential direction) of the spring seat by press-fitting can be arbitrarily set by adjusting the size of the tightening allowance. In the present embodiment, the fixing convex portion 26 is substantially circular. However, the fixing convex portion 26 may not be circular as long as it can accommodate the fixing convex portion. For example, a part of the fixing concave part that faces the part between the two fixing convex parts (the part that does not protrude) may protrude inward in the radial direction and be in contact with the outer cylinder. By comprising in this way, the contact area of a spring seat fixing | fixed part and an engaging part increases, and stability of a spring seat increases.

  With the above configuration, when the outer shell 7 is inserted into the spring seat 28, the circumferential position of the outer shell 7 with respect to the spring seat 28 is such that the positioning convex portion 20 can be engaged with the positioning concave portion 24. Limited to one position. Therefore, it is not necessary to perform alignment by visual observation, assembly is simple, and erroneous insertion can be prevented.

  In this way, only one insertion position in the circumferential direction is determined because of the circumferential arrangement of the positioning projections 20 provided on the outer shell 7 (that is, the outer circumferential portion of the outer shell 7 in the radial direction of the positioning projection 20). This is because it has one-time rotational symmetry. Here, the rotational symmetry will be described. When a figure is rotated with respect to one point and becomes the same as the original figure, the figure is said to have rotational symmetry. When the figure overlaps with the original figure n times while rotating the figure 360 degrees, the figure has n-fold rotational symmetry (n is a natural number). For example, equilateral triangles have three-fold rotational symmetry, and regular pentagons have five-fold rotational symmetry. A circle has infinite rotational symmetry. A figure that does not overlap the original figure at any angle when rotated has a one-time rotational symmetry. That is, the fact that the outer peripheral portion of the radial cross section of the positioning convex portion 20 of the outer shell 7 has one-time rotational symmetry means that there is only one insertion position in the circumferential direction of the spring seat 28. When the outer shell has n-fold rotational symmetry (n is a natural number of 2 or more), the outer shell can be provided with one-fold rotational symmetry simply by deforming one portion of the outer shell. Can be used.

  In the present embodiment, the outer shell 7 is inserted into the spring seat 28 so that one positioning protrusion 20 engages with one positioning recess 24. With such a configuration, the circumferential position is not erroneously inserted when the spring seat is press-fitted, and the working efficiency during assembly is improved. Further, since the circumferential width on the outer side of the positioning convex portion 20 and the circumferential width on the inner side of the positioning concave portion 24 are substantially equal, the holding force in the circumferential direction of the outer shell 7 is high.

  Next, a second embodiment of the present invention will be described. FIG. 5 is a radial cross-sectional view of the positioning recess 24 of the spring seat 128 according to the present embodiment, and FIG. 6 is a radial cross-sectional view of the positioning convex portion 20 of the outer shell 107. This embodiment is different from the first embodiment in that there are two positioning recesses 24 and two positioning protrusions 20. Further, as shown in FIGS. 5 and 6, the positioning concave portion 24 and the positioning convex portion 20 are arranged so as to have one-time rotational symmetry. For this reason, when the outer shell 107 is inserted into the spring seat 128, the circumferential position of the outer shell 107 with respect to the spring seat 128 is only one position where the two positioning convex portions 20 can engage with the two positioning concave portions 24, respectively. It is limited to. Therefore, it is not necessary to perform alignment by visual observation, and assembly is easy. Further, in this embodiment, since there are a plurality of positioning recesses and positioning protrusions, the holding force in the circumferential direction of the outer shell 107 is higher than that in the first embodiment.

  In this embodiment, since the two positioning projections 20 have the same shape, one positioning projection 20 rotates 180 degrees around the axis of the outer cylinder 107 with respect to the other positioning projection 20. It is necessary to provide it at a position excluding the position (because if it is provided at a position rotated 180 degrees, the cross section will have rotational symmetry twice). When the two positioning protrusions have different shapes, they can be provided at any location on the outer periphery of the outer cylinder, including the position rotated 180 degrees.

  Next, a third embodiment of the present invention will be described. FIG. 7 is a partial front view of the outer shell 207 of the present embodiment, and FIG. 8 is a radial sectional view of the positioning convex portion 220 of the outer shell 207 of FIG. 7 (a sectional view of the YY plane viewed in the direction of the arrow. ). This embodiment is different from the first embodiment in that the width (circumferential length) of the insertion-side tip portion of the positioning convex portion 220 is smaller than the maximum width of the positioning convex portion 220 and the positioning convex portion 220. This is because the position of the distal end portion in the insertion direction is provided in front of the distal end portion on the insertion side of the fixing projection 22. Thus, the outer shell 207 is inserted into the spring seat (not shown) by making the width (circumferential length) of the positioning projection 220 in the insertion direction smaller than the maximum width of the positioning projection 220. In this case, positioning is simple and erroneous insertion can be prevented. Further, the position of the front end portion in the insertion direction of the positioning convex portion 220 is provided in front of the front end portion on the insertion side of the fixing convex portion 22, that is, when the outer shell 207 is inserted into the spring seat (not shown). When the circumferential position of the convex portion 220 and the engaging portion (not shown) of the spring seat are different, the positioning convex portion 220 comes into contact with any part of the spring seat before the fixing convex portion 20. Positioning is simple and erroneous insertion can be prevented. In this embodiment, the positioning convex portion 220 is provided in the insertion direction forward of the fixing convex portion 22, but the positioning recess is provided in the insertion direction forward of the fixing concave portion in the engaging portion of the spring seat. Also good.

  Next, a fourth embodiment of the present invention will be described. FIG. 9 is a radial sectional view of the positioning recess 324 of the spring seat 328 of the present embodiment, and FIG. 10 is a radial sectional view of the positioning projection 20 of the outer shell 307. This embodiment is different from the first embodiment in that one positioning recess 324 is engaged with two positioning protrusions 20. In this case, the positioning recess 324 engages with the surface on the right side in the circumferential direction of one positioning projection 20 and the surface on the left side in the circumferential direction of the other positioning projection 20, that is, on both sides of the two positioning projections 20. Thus, the movement of the spring seat 328 to both sides in the circumferential direction (left-right rotation direction) is restricted. If comprised in this way, formation of a spring seat will become easy and manufacturing cost can be reduced. In the present embodiment, the circumferential length of the positioning recess 324 is less than or equal to half of the circumference, but a positioning recess having a circumferential length of more than half of the circumference may be formed. When a positioning recess having a circumferential length of half or more of the circumference corresponding to the positioning projection 20 of the present embodiment is formed, the positioning recess is formed on the left side surface and the left side of the right positioning projection 20. The positioning projection 20 is engaged with the surface on the right side in the circumferential direction.

  In the above-described embodiment, a so-called twin tube type shock absorber is targeted. However, the object of the present invention is not limited to this, and a mono tube type shock absorber, an inverted shock absorber, and other cylinder devices. It can also be applied to. In this case, the outer cylinder of the present invention refers to a cylindrical member to which a spring seat is fixed in each cylinder device, and the rod protrudes from the outer cylinder and moves relative to the outer cylinder in the axial direction. (Or cylindrical) refers to a member.

  In the above embodiment, the positioning recess is formed by projecting a part of the spring seat radially outward. However, the positioning recess has a function of regulating the relative rotation of the outer shell and the spring seat. For example, it may be a through hole (opening) having a right rotation restricting portion and a left turn restricting portion.

  Further, in the above embodiment, the spring seat is an integrally molded product provided with a hole for inserting the outer cylinder at the center, but may be a split molded product. In this case, the positioning recess can be formed in the spring seat so as to contact the positioning protrusion not only in the circumferential direction but also in the axial direction, and in this case, the holding force in the axial direction is increased.

  In the above embodiment, the outer cylinder provided with the fixing convex portion is shown, but an outer cylinder not provided with the fixing convex portion may be used. In this case, a member having a function of fixing the spring seat at least in the axial direction is required, but the positioning convex portion may have this function. Alternatively, an adhesive can be used.

  In the above embodiment, the positioning convex portion is formed by projecting a part of the outer cylinder radially outward. However, the method of providing the positioning convex portion is not limited thereto. For example, you may fix a pin-shaped member to the outer peripheral part of an outer cylinder by methods, such as adhesion | attachment and welding. Similarly, the positioning recess may be provided by a method such as cutting.

  Further, in the above embodiment, the fixing convex portion is provided, but it can be understood that these can be distinguished from the positioning convex portion on some basis. For example, in all the embodiments, the height (distance from the axis to the outermost part), that is, the cross-sectional shape is different, and in the third embodiment, the position in the axial direction is different. In the third embodiment, since the positions in the axial direction are different, the cross-sectional shapes of the positioning convex portion 220 and the fixing convex portion may be the same.

Sectional drawing of the shock absorber in the 1st Embodiment of this invention Partial sectional view of the spring seat and the outer shell in the first embodiment of the present invention Sectional drawing in the XX plane of the spring seat of FIG. Sectional drawing in the YY plane of the outer shell of FIG. Radial direction sectional drawing in the positioning recessed part of the spring seat in the 2nd Embodiment of this invention Radial direction sectional view in a positioning convex part of an outer shell in a 2nd embodiment of the present invention The partial front view of the outer shell in the 3rd Embodiment of this invention Radial direction sectional view in the positioning convex part of outer shell of Drawing 7 Radial direction sectional view in positioning crevice 324 of a spring seat in a 4th embodiment of the present invention. Radial direction sectional view in a positioning convex part of an outer shell in a 4th embodiment of the present invention

Explanation of symbols

5 Piston rod (rod)
7 Outer shell (outer cylinder)
20 positioning convex portion 21 spring seat fixing portion 22 fixing convex portion 24 positioning concave portion 25 engaging portion 26 fixing concave portion 28 spring seat 107 outer shell (outer cylinder)
128 Spring seat 207 Outer shell (outer cylinder)
220 Positioning convex portion 307 Outer shell 320 Positioning convex portion 324 Positioning concave portion 328 Spring seat

Claims (6)

An outer cylinder having a rod extending in a telescopic manner;
A spring seat fixing portion provided on an outer peripheral portion of the outer cylinder;
In a cylinder device comprising a spring seat having an engaging portion that engages with the spring seat fixing portion,
The spring seat fixing part has at least one positioning convex part projecting radially outward,
The engagement portion has a positioning recess that engages with the surfaces on both sides in the circumferential direction of the positioning projection to restrict movement of the spring seats on both sides in the circumferential direction,
The positioning convex portion and the positioning concave portion are provided on the spring seat fixing portion and the engaging portion, respectively, so that the spring seat and the outer cylinder are fitted only at one circumferential position. Cylinder device characterized.
An outer cylinder having a rod extending in a telescopic manner;
A spring seat fixing portion provided on an outer peripheral portion of the outer cylinder;
In a cylinder device comprising a spring seat having an engaging portion that engages with the spring seat fixing portion,
The spring seat fixing part has at least one positioning convex part projecting radially outward,
The engagement portion has a positioning recess that engages with the surfaces on both sides in the circumferential direction of the positioning projection to restrict movement of the spring seats on both sides in the circumferential direction,
The positioning convex portion is provided on the spring seat fixing portion so that an outer peripheral portion of a radial cross section of the spring seat fixing portion at the position of the positioning convex portion has one-time rotational symmetry. Cylinder device.
The cylinder device according to claim 1 or 2,
The cylinder device, wherein the spring seat fixing portion has at least one fixing convex portion that protrudes radially outward from the outer cylinder and abuts the spring seat in the axial direction.
The cylinder device according to claim 3,
The spring seat is formed to engage the outer cylinder by inserting the outer cylinder,
When the positioning convex portion and the engaging portion have different circumferential positions at the time of insertion, the positioning convex portion comes into contact with any part of the spring seat before the fixing convex portion. A cylinder device characterized in that a part is provided.
The cylinder device according to claim 3,
The engaging portion has at least one fixing concave portion that engages with the fixing convex portion,
A diameter of a circle inscribed in the fixing concave portion is formed smaller than a diameter of a circle circumscribed in the fixing convex portion, and the fixing convex portion becomes the fixing concave portion when the outer cylinder is inserted into the spring seat. Cylinder device that is press-fitted and fixed to the cylinder.
The cylinder device according to any one of claims 1 to 5,
A cylinder device characterized in that the width of the front end of the positioning projection in the insertion direction is smaller than the maximum width of the positioning projection.

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