Cover member and cushioning device

Abstract

To provide a cover member for determining the shape without being influenced by the shape of an eye joint.SOLUTION: A cover member 100 includes an annular member 110 fixed to a rod protruding from a cylinder part into which oil is filled, and covering one end of the cylinder part, and a cylindrical member connected to the annular member 110 and covering an area around the rod, the cylindrical member having a first member 130 and a second member 140 split in the direction crossing the axial direction of the rod and connected to each other after coming close to each other to neighbor each other from the crossing direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a cover member and a shock absorber. [Background technology]

[0002] For example, the cylinder device described in Patent Document 1 is configured as follows: That is, it has a cylinder in which a fluid is sealed, a rod extending on one side from the cylinder, an annular member provided on one side of the rod, and a tubular member joined to the outer periphery of the annular member, the tubular member being formed from a single thin plate and having a main plate portion rolled into a cylindrical shape, a first bent portion folded inward from one end of the main plate portion, and a second bent portion folded outward from the other end of the main plate portion, the first bent portion and the second bent portion meshing together to form a lock seam portion, which protrudes more inward than the main plate portion and is formed to avoid the portion facing the annular member. The rod is inserted into the inner peripheral plate portion of the annular member at the radial center thereof, and the inner peripheral edge of the inner peripheral plate portion is joined and fixed to the rod at an axially intermediate position by welding or the like. The tubular member is also fixed to the annular member by resistance welding to form the cover member. A mounting eye is fixed to the outside of the bottom of the cylinder outer tube. When the cylinder device is installed on a vehicle, for example, the rod is located on the upper side and connected to the vehicle body, and the mounting eye is located on the lower side and connected to the wheel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-173814 Summary of the Invention [Problem to be solved by the invention]

[0004] In a cylinder device, an eye joint (a mounting eye in Patent Document 1) may also be fixed to the upper end of the rod, which is connected to the vehicle body via the eye joint. In this way, if the cylinder is made up of an annular member and a tubular member and the eye joints are provided on the upper and lower sides of a cover member that covers the outer surface of the cylinder and the end on the vehicle body side, the tubular member is cylindrical, so unless the inner shape (e.g., inner diameter) of the tubular member is made larger than the outer shape (e.g., outer diameter) of the eye joint, it will be difficult to assemble the tubular member to the annular member. As a result, the size of the tubular member will be affected by the shape of the eye joint. An object of the present invention is to provide a cover member or the like whose shape can be determined without being affected by the shape of the eye joint. [Means for solving the problem]

[0005] The present invention, which was completed with this objective in mind, comprises an annular member fixed to a rod protruding from a cylinder portion in which a fluid is sealed and covering one end of the cylinder portion, and a tubular member connected to the annular member and surrounding the rod, the tubular member being a cover member formed by dividing a plurality of members in a direction intersecting the axial direction of the rod, which are brought close to each other from the intersecting direction and then connected together. [Effects of the Invention]

[0006] According to the present invention, it is possible to provide a cover member or the like whose shape can be determined without being affected by the shape of the eye joint. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a diagram illustrating an example of a schematic configuration of a shock absorber according to a first embodiment. [Figure 2] FIG. 2 is a perspective view showing an example of the appearance before the cover member according to the first embodiment is connected. [Figure 3]1A is an example of a view of the appearance of the first member and the second member according to the first embodiment before they are joined, as viewed in the axial direction from the second side, and FIG. 1B is an example of a view of the appearance of the first member and the second member according to the first embodiment before they are joined, as viewed in the radial direction from the outside. [Figure 4] FIG. 10 is a perspective view showing an example of the appearance after the cover member is connected. [Figure 5] 1A and 1B are diagrams illustrating an example of joining of a first member and a second member, where (a) is a diagram illustrating an example before joining and (b) is a diagram illustrating an example after joining. [Figure 6] 1A and 1B are diagrams illustrating an example of joining of a first member and a second member, in which (a) is a diagram illustrating an example of before joining and (b) is a diagram illustrating an example of after joining. [Figure 7] 10(a) is a perspective view showing an example of the appearance of a cylindrical member, and (b) is a perspective view showing an example of the appearance of a cylindrical member according to a modified example. [Figure 8] 10A and 10B are diagrams illustrating an example of a schematic configuration of a cover member according to a second embodiment, where (a) is a diagram illustrating an example before bonding and (b) is a diagram illustrating an example after bonding. [Figure 9] 10A and 10B are diagrams showing an example of a modified example of a connection between an annular member and a tubular member according to the second embodiment, where (a) is a diagram showing an example before joining and (b) is a diagram showing an example after joining. [Figure 10] 10A and 10B are diagrams showing an example of a schematic configuration of a cover member according to a third embodiment, in which (a) is an example of a partial cross-sectional view showing a state before the annular member and the tubular member are joined, (b) is an example of a state after the annular member and the tubular member are joined, and (c) is an example of a joined state. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. First Embodiment FIG. 1 is a diagram showing an example of a schematic configuration of a shock absorber 1 according to a first embodiment. The shock absorber 1 is a hydraulic shock absorber used in four-wheeled vehicles such as passenger cars, and as shown in Figure 1, it includes a cylinder portion 10, a rod 20, a piston portion 30, a bottom portion 40, and a cover member 100, which will be described in detail later.

[0009] Hereinafter, the axial direction of the rod 20 may be simply referred to as the "axial direction." Furthermore, a first axial side (lower side in FIG. 1) and a second axial side (upper side in FIG. 1) may be simply referred to as the "first side" and the "second side," respectively. Furthermore, a direction intersecting the axial direction (for example, a perpendicular direction) may be simply referred to as the "radial direction." In the radial direction, the side of the center line of the cylinder 11 (described later) may be simply referred to as the "inner side," and the side away from the center line may be simply referred to as the "outer side." Furthermore, the direction around the axis of the rod 20 may be simply referred to as the "circumferential direction." In the circumferential direction, as shown in FIG. 3(a), the upstream side and the downstream side in the clockwise direction when viewed in the axial direction from the second side may be simply referred to as the "one end side" and the "other end side," respectively.

[0010] (Cylinder part 10) The cylinder portion 10 includes a cylinder 11 that stores oil, an outer tube 12 provided on the outside of the cylinder 11, a bottom cover 13 that closes a first end of the outer tube 12, and an eye joint 14 that is fixed to the first surface of the bottom cover 13 by welding or the like. The outer peripheral surface of the cylinder 11 and the inner peripheral surface of the outer tube 12 form a reservoir chamber R in the cylinder portion 10. The cylinder portion 10 also includes a rod guide portion 15 that movably supports the rod 20, and an oil seal 16 that prevents oil leakage from the cylinder portion 10 and the intrusion of foreign matter into the cylinder portion 10. The cylinder portion 10 also includes a rebound seat 17 and a rebound rubber 18.

[0011] (Rod 20) The rod 20 is a rod-shaped member that extends long in the axial direction. The rod 20 holds the piston portion 30 at a first end. A rebound seat 17 is fixed to the rod 20 by welding or the like. An eye joint 25 and a later-described annular member 110 of the cover member 100 are fixed to a second end of the rod 20 by welding, for example.

[0012] (Piston part 30) The piston section 30 includes a piston 31, a valve group 32 that blocks first ends of some of the oil passages formed in the piston 31, and a valve group 33 that blocks second ends of some of the oil passages formed in the piston 31. The piston portion 30 is fixed to the rod 20 by a nut 35 .

[0013] (Bottom part 40) As shown in FIG. 1, the bottom portion 40 includes a valve body 41 having a plurality of oil passages passing through in the axial direction, a valve 42 provided on a first side of the valve body 41, and a valve 43 provided on a second side of the valve body 41. The valve body 41 of the bottom portion 40 separates the oil chamber and the reservoir chamber R in the cylinder 11.

[0014] (Cover member 100) FIG. 2 is a perspective view showing an example of the appearance of the cover member 100 according to the first embodiment before it is connected. Fig. 3(a) is an example of a view of the appearance of the first member 130 and the second member 140 according to the first embodiment before they are joined, as viewed in the axial direction from the second side. Fig. 3(b) is an example of a view of the appearance of the first member 130 and the second member 140 according to the first embodiment before they are joined, as viewed in the radial direction from the outside. FIG. 4 is a perspective view showing an example of the appearance after the cover member 100 is connected. Fig. 5 is an example of a diagram for explaining the joining of the first member 130 and the second member 140. Fig. 5(a) is a diagram showing an example before joining, and Fig. 5(b) is a diagram showing an example after joining. Fig. 5 is also a partial cross-sectional view of part VV in Fig. 3(b). The cover member 100 includes an annular member 110 that covers the second end of the cylinder portion 10, and a tubular member 120 that is connected to the annular member 110 and that covers the periphery of the rod 20.

[0015] (Annular member 110) The annular member 110 has an annular inner portion 111 provided on the inside, an annular outer portion 112 provided outside the inner portion 111, a connecting portion 113 provided between the inner portion 111 and the outer portion 112 and connecting the inner portion 111 and the outer portion 112, and an axial portion 114 extending from the outer periphery of the outer portion 112 to a first side in the axial direction.

[0016] The inner portion 111 and the outer portion 112 are surfaces perpendicular to the axial direction, and the connecting portion 113 is a cylindrical portion inclined in the axial direction. With the rod 20 passing through the inside of the inner portion 111, the annular member 110 is fixed to the rod 20 by welding or the like. The axial portion 114 is formed over a predetermined range in a part of the circumferential direction on the outer periphery of the outer portion 112. The predetermined range is a range within the circumferential range in which a gap 151 and a notch 152, which will be described later, are formed. In this embodiment, two axial portions 114 are formed at positions facing each other across the axis of the rod 20.

[0017] (Cylindrical member 120) The cylindrical member 120 is composed of a pair of members, a first member 130 and a second member 140, which are arranged to face each other on opposite sides of a plane passing through the axis of the rod 20. The cylindrical member 120 has a cylindrical portion 121 (see FIG. 1) that becomes cylindrical when the pair of members are fitted together, and an annular portion 122 (see FIG. 1) that protrudes inward from a second end of the cylindrical portion 121. The diameter of the inner circumferential surface of the cylindrical portion 121 is larger than the diameter of the outer circumferential surface of the outer tube 12 (see FIG. 1), and the second end of the cylinder portion 10 enters the interior of the cylindrical portion 121.

[0018] The first member 130 has a semi-cylindrical first semi-cylindrical portion 131 that forms part of the cylindrical portion 121 (see FIG. 1), and a semi-annular first semi-annular portion 132 that forms part of the annular portion 122 (see FIG. 1). The second member 140 has a second semi-cylindrical portion 141 that is semi-cylindrical and that constitutes a part of the cylindrical portion 121 , and a second semi-annular portion 142 that is semi-annular and that constitutes a part of the annular portion 122 .

[0019] The first semi-cylindrical portion 131 has a first mating surface 133 provided at one end in the circumferential direction and serving as a mating surface with the second member 140, and a second mating surface 134 provided at the other end in the circumferential direction and serving as a mating surface with the second member 140. The first semi-cylindrical portion 131 has first protrusions 135 that protrude in the radial direction from the first mating surface 133. In this embodiment, the first semi-cylindrical portion 131 has a plurality of (for example, five) first protrusions 135 that are aligned in the axial direction. The second mating surface 134 is formed with first through holes 136 that penetrate in the radial direction. In this embodiment, the second mating surface 134 is formed with a plurality of (for example, five) first through holes 136 that are aligned in the axial direction.

[0020] The second semi-cylindrical portion 141 has a third mating surface 143 provided at one end in the circumferential direction and serving as a mating surface with the first member 130, and a fourth mating surface 144 provided at the other end in the circumferential direction and serving as a mating surface with the first member 130. Additionally, the second semi-cylindrical portion 141 has second protruding portions 145 that protrude in the radial direction from the third mating surface 143. In this embodiment, the second semi-cylindrical portion 141 has a plurality (for example, five) of second protruding portions 145 lined up in the axial direction. The fourth mating surface 144 is formed with second through holes 146 that penetrate in the radial direction. In this embodiment, the fourth mating surface 144 is formed with a plurality (for example, five) of second through holes 146 that are lined up in the axial direction. There are no particular limitations on the shapes of the first through hole 136 and the second through hole 146. For example, the shape of the first through hole 136 and the second through hole 146 when viewed in the radial direction may be a circle, an ellipse, or another shape.

[0021] The first semicircular annular portion 132 and the second semicircular annular portion 142 each have a size less than half the circumference, and a circumferential gap 151 is formed between the first semicircular annular portion 132 and the second semicircular annular portion 142. In this embodiment, two gaps 151 are formed at positions facing each other across the axis of the rod 20. A notch 152 is formed in the second end of the cylindrical portion 121 at a position corresponding to the gap 151.

[0022] The first semi-annular portion 132 and the second semi-annular portion 142 each have a first axial portion 139 and a second axial portion 149 extending from the inner circumferential portion toward a second side in the axial direction. The inner diameters of the first axial portion 139 and the second axial portion 149 are larger than the outer diameter of the end of the connecting portion 113 of the annular member 110 on the outer portion 112 side.

[0023] In the cylindrical member 120 configured as described above, the first mating surface 133 of the first member 130 and the fourth mating surface 144 of the second member 140 are overlapped, and the second mating surface 134 of the first member 130 and the third mating surface 143 of the second member 140 are overlapped. As shown in FIG. 5 , the first protruding portion 135 of the first member 130 is passed through the second through hole 146 of the second member 140, and its tip is melted to become larger than the size of the second through hole 146. Furthermore, the second protruding portion 145 of the second member 140 is passed through the first through hole 136 of the first member 130, and its tip is melted to become larger than the size of the first through hole 136. As a result, the first member 130 and the second member 140 are integrated.

[0024] Furthermore, the annular member 110 and the tubular member 120 are connected such that the outer portion 112 of the annular member 110 is located on the first side of the annular portion 122 of the tubular member 120, and the two axial portions 114 are exposed to the outside of the tubular member 120 via the gap 151 and the notch 152 of the tubular member 120. As a result, the annular member 110 and the tubular member 120 are connected so as not to be separated in the axial direction.

[0025] (Method of manufacturing shock absorber 1) ((Rod assembly)) The eye joint 25 and the annular member 110 of the cover member 100 are fixed to the second end of the rod 20, for example, by welding. Then, from the first end of the rod 20, the oil seal 16, the rod guide portion 15, the rebound rubber 18, and the rebound seat 17 are assembled in this order, and the rebound seat 17 is fixed to the rod 20. Also, from the first end of the rod 20, the piston portion 30 is assembled and fixed with a nut 35. In this manner, the rod assembly is assembled.

[0026] ((Outer cylinder assembly)) Meanwhile, the eye joint 14 is fixed to the first side surface of the bottom cover 13 of the cylinder portion 10 by, for example, welding. Then, the cylinder 11 with the bottom portion 40 press-fitted inside is inserted into the outer cylinder 12 on the second side of the bottom cover 13. In this manner, the outer cylinder assembly is assembled.

[0027] Thereafter, the rod assembly is inserted into the cylinder 11 of the outer cylinder assembly from the nut 35 side. Then, the second end of the outer cylinder 12 is bent inward, i.e., roll crimping is performed, so that the rod guide portion 15 and the oil seal 16 are fixed between the cylinder 11 and the crimped portion 12R of the outer cylinder 12 (see FIG. 1).

[0028] ((Assembly of the cover member 100)) As shown in FIG. 2, the first member 130 and the second member 140 are moved from the outside to the inside with the first semicircular annular portion 132 of the first member 130 and the second semicircular annular portion 142 of the second member 140 positioned on the second side relative to the annular member 110 fixed to the rod 20. At this time, as shown in FIG. 4, the two axial portions 114 of the annular member 110 are exposed to the outside of the first semicylindrical portion 131 of the first member 130 and the second semicylindrical portion 141 of the second member 140 via the gap 151 and the notch 152. Then, as shown in FIG. 5(a), the first protruding portion 135 of the first member 130 is passed through the second through-hole 146 of the second member 140, and the second protruding portion 145 of the second member 140 is passed through the first through-hole 136 of the first member 130. 5(b), the tip portions of the first protrusion 135 and the second protrusion 145 are melted so that they are larger than the second through-hole 146 and the first through-hole 136, respectively, to join (in other words, weld) the first member 130 and the second member 140. In this way, the annular member 110, the first member 130, and the second member 140 are integrated, and the cover member 100 is assembled.

[0029] As described above, the cover member 100 includes the annular member 110 that is fixed to the rod 20 protruding from the cylinder portion 10 in which oil (an example of a fluid) is sealed and that covers one end (e.g., the second end) of the cylinder portion 10, and the tubular member 120 that is connected to the annular member 110 and that covers the periphery of the rod 20. The tubular member 120 is connected to a plurality of members (e.g., first member 130, second member 140) that are divided in a direction intersecting the axial direction of the rod 20 and that are brought close to each other so as to be adjacent to each other from the intersecting direction.

[0030] In cover member 100 configured as described above, tubular member 120 is not assembled by moving it in the axial direction of rod 20 while in a tubular state, so the shape of tubular member 120 can be determined without being affected by the shapes of eye joint 25 and eye joint 14. For example, in a configuration in which tubular member 120 is assembled by moving it in the axial direction of rod 20, the inner diameter of tubular member 120 needs to be larger than the outer shape (e.g., outer diameter) of eye joint 25 and eye joint 14. However, in cover member 100, the divided members (e.g., first member 130, second member 140) are brought close to each other so as to be adjacent to each other in a direction intersecting the axial direction and then connected, so there is no need to make the inner diameter of tubular member 120 larger than the outer shape (e.g., outer diameter) of eye joint 25 and eye joint 14.

[0031] The cylindrical member 120 includes a first member 130 having a first mating surface 133 (an example of a first connecting portion) provided on one end side (e.g., one end side) in the circumferential direction of the rod 20, and a second mating surface 134 (an example of a second connecting portion) provided on the other end side (e.g., the other end side) in the circumferential direction of the rod 20. The cylindrical member 120 also includes a second member 140 having a third mating surface 143 (an example of a third connecting portion) provided on one end side and connected to the second mating surface 134, and a fourth mating surface 144 (an example of a fourth connecting portion) provided on the other end side and connected to the first mating surface 133.

[0032] According to the cylindrical member 120 configured as described above, the first member 130 and the second member 140 can be moved in a direction intersecting the axial direction and connected to form a cylindrical shape that covers the periphery of the rod 20. Furthermore, the first member 130 and the second member 140 can be made into the same part.

[0033] A first protruding portion 135 is provided on the first mating surface 133 of the first member 130, protruding from the surface in a direction (for example, a radial direction) intersecting the axial direction of the rod 20, and a second through hole 146 is formed on the fourth mating surface 144 of the second member 140, through which the first protruding portion 135 passes. The tip of the first protruding portion 135 is melted after passing through the second through hole 146, and is made larger than the size of the second through hole 146, thereby connecting the first member 130 and the second member 140.

[0034] In addition, the tubular member 120 has an annular portion 122 (an example of an inward portion) that protrudes inward at the second axial end, and the annular portion 122 is positioned on the opposite side of the cylinder portion 10 from the outer portion 112 of the annular member 110, thereby preventing the annular member 110 from moving toward the cylinder portion 10.

[0035] (Modifications of the first protrusion 135 and the second protrusion 145) 6A and 6B are diagrams illustrating an example of joining of the first member 130 and the second member 140, with FIG. 6A showing an example before joining and FIG. 6B showing an example after joining. The manner in which the first member 130 and the second member 140 are connected is not particularly limited. For example, as shown in FIG. 6 , a first protrusion 137, which is a modified example of the first protrusion 135, may have a shape in which the tip portion 138 is larger than the size of the second through hole 146, and the tip portion 138 elastically deforms when passing through the second through hole 146 and returns to its original shape after passing through the second through hole 146. For example, as shown in FIG. 6 , the first protrusion 137 is composed of a pair of protrusions 137a protruding radially from the first mating surface 133, and the tip portions 138 of the pair of protrusions 137a deform so as to approach each other when passing through the second through hole 146. The second protrusion 145 may also have the same shape as the first protrusion 137. Since the first protrusion 135 and the second protrusion 145 are the first protrusion 137 according to the modified example, it becomes possible to connect the first member 130 and the second member 140 by inserting the tip 138 into the second through-hole 146, for example, and therefore the connection can be easily performed.

[0036] (Modification of the cylindrical member 120) Fig. 7(a) is a perspective view showing an example of the appearance of a cylindrical member 120. Fig. 7(b) is a perspective view showing an example of the appearance of a cylindrical member 150 according to a modified example. As shown in FIG. 7(a), the tubular member 120 described above is cylindrical, but is not limited to a cylindrical shape. As long as it covers the periphery of the rod 20, the tubular member 120 may have other shapes, such as an elliptical cylindrical shape. Furthermore, as shown in FIG. 7(b), a modified tubular member 150 may have ribs 155 protruding outward from the outer circumferential surface. The ribs 155 may be provided around the entire circumference as shown in FIG. 7(b), or may be provided along a portion of the circumference. Furthermore, the ribs 155 may be provided in a concentrated manner in a predetermined region in the axial direction as shown in FIG. 7(b), or may be provided intermittently throughout the entire axial direction. Furthermore, when the ribs 155 are provided in a concentrated manner in a predetermined region in the axial direction, the ribs 155 may be provided at a first end portion in the axial direction, at a second end portion in the axial direction, or at a central portion in the axial direction as shown in FIG. 7(b).

[0037] Second Embodiment 8A and 8B are diagrams showing an example of a schematic configuration of a cover member 200 according to the second embodiment, in which Fig. 8A shows an example before joining, and Fig. 8B shows an example after joining. The cover member 200 according to the second embodiment differs from the cover member 100 according to the first embodiment in the manner in which an annular member 210 corresponding to the annular member 110 and a tubular member 220 corresponding to the tubular member 120 are connected. Below, the differences between the cover member 200 according to the second embodiment and the cover member 100 according to the first embodiment will be described. The same reference numerals will be used for the same components between the first and second embodiments, and detailed descriptions thereof will be omitted.

[0038] The annular member 210 has an inner portion 111 , a connecting portion 113 , an outer portion 212 corresponding to the outer portion 112 , and an axial portion 214 corresponding to the axial portion 114 . A third through hole 215 is formed in the outer portion 212, penetrating in the axial direction. In this embodiment, a plurality of third through holes 215 (six in FIG. 8 ) are formed in the outer portion 212 in the circumferential direction. The shape of the third through hole 215 is not particularly limited. For example, the shape of the third through hole 215 when viewed in the axial direction may be a circle, an ellipse, or another shape. The axial portion 214 protrudes in the axial direction over the entire circumference from the outer periphery of the outer portion 212. In other words, the axial portion 214 is cylindrical, and covers the outer periphery of the second end portion of the cylindrical portion 121 of the tubular member 220.

[0039] The cylindrical member 220 has a first member 230 corresponding to the first member 130 and a second member 240 corresponding to the second member 140. The first member 230 has a first semi-cylindrical portion 131 and a first semi-annular portion 232 that corresponds to the first semi-annular portion 132. The second member 240 has a second semi-cylindrical portion 141 and a second semi-annular portion 242 that corresponds to the second semi-annular portion 142.

[0040] The first semicircular annular portion 232 and the second semicircular annular portion 242 form an annular portion 222 corresponding to the annular portion 122. The first semicircular annular portion 232 and the second semicircular annular portion 242 are provided with third protruding portions 223 that protrude toward a second side in the axial direction. In this embodiment, a plurality of third protruding portions 223 (six in FIG. 8) are provided and aligned in the circumferential direction.

[0041] ((Assembly of the cover member 200)) 8(a), in the cover member 200 configured as described above, the first member 230 and the second member 240 are moved from the outside to the inside with the first semicircular annular portion 232 of the first member 230 and the second semicircular annular portion 242 of the second member 240 positioned closer to the first side than the annular member 210 fixed to the rod 20. Then, similar to the cover member 100, the first member 230 and the second member 240 are joined together using the first protruding portion 135 and the first through hole 136 of the first member 230 and the second protruding portion 145 and the second through hole 146 of the second member 240.

[0042] Then, as shown in Figure 8(b), the third protrusion 223 provided on the annular portion 222 of the tubular member 220 is passed through the third through hole 215 formed in the annular member 210, and the tip portion 228 of the third protrusion 223 is melted so that it becomes larger than the size of the third through hole 215, thereby joining the annular member 210 and the tubular member 220. In this way, the annular member 210 and the cylindrical member 220 are integrated together, and the cover member 200 is assembled.

[0043] As described above, the cylindrical member 220 has, at its axial end, an annular portion 222 (an example of an inward portion) that protrudes inward, and a third protruding portion 223 (an example of a convex portion) that protrudes in the axial direction from the annular portion 222, and the annular member 210 has a third through hole 215 formed therein through which the third protruding portion 223 passes. Then, the tip portion 228 of the third protruding portion 223 is melted after passing through the third through hole 215, so that the tip portion 228 is made larger than the size of the third through hole 215, thereby connecting the cylindrical member 220 and the annular member 210. In this way, the annular member 210 and the cylindrical member 220 are connected so as not to be separated in the axial direction of the rod 20.

[0044] (Modification of the connection mode between the annular member 210 and the cylindrical member 220 according to the second embodiment) 9A and 9B are diagrams showing an example of a modified example of a connection mode between the annular member 210 and the cylindrical member 220 according to the second embodiment. Fig. 9A shows an example before joining, and Fig. 9B shows an example after joining. The manner in which the annular member 210 and the tubular member 220 are connected is not particularly limited. As shown in Fig. 9, a third protruding portion 227, which is a modified example of the third protruding portion 223, may have a shape in which, for example, a tip end 228 is larger than the size of the third through hole 215, and the tip end 228 elastically deforms when passing through the third through hole 215 (see Fig. 8) and returns to its original shape after passing through the third through hole 215. For example, as shown in Fig. 9, the third protruding portion 227 is composed of a pair of protruding portions 227a protruding in the axial direction from the annular portion 222, and the tip ends 228 of the pair of protruding portions 227a deform so as to approach each other when passing through the third through hole 215. The third protrusion 227 according to the modified example makes it possible to connect the annular member 210 and the tubular member 220, for example, by inserting the tip 228 into the third through hole 215, thereby enabling easy connection. 9, the annular member 210 may be formed with holes through which a plurality of third protrusions 227 pass.

[0045] Third Embodiment Fig. 10 is a diagram showing an example of a schematic configuration of a cover member 300 according to the third embodiment. Fig. 10(a) is a partial cross-sectional view showing a state before the annular member 310 and the cylindrical member 320 are joined, Fig. 10(b) is a state after the annular member 310 and the cylindrical member 320 are joined, and Fig. 10(c) is an example of a partial cross-sectional view showing the joined state. The cover member 300 according to the third embodiment differs from the cover member 200 according to the second embodiment in the manner in which an annular member 310 corresponding to the annular member 210 and a tubular member 320 corresponding to the tubular member 220 are connected. The following describes the differences between the cover member 300 according to the third embodiment and the cover member 200 according to the second embodiment. The same reference numerals are used for the same components in the second and third embodiments, and detailed descriptions thereof will be omitted.

[0046] The annular member 310 has an inner portion 111 , a connecting portion 113 , an outer portion 312 corresponding to the outer portion 212 , and an axial portion 314 corresponding to the axial portion 214 . The outer portion 312 differs from the outer portion 212 in that the third through-hole 215 is not formed therein. The axial portion 314 differs from the axial portion 214 in that a fourth through hole 315 penetrating in the radial direction is formed in the axial portion 314. In this embodiment, a plurality of (for example, six) fourth through holes 315 are formed in the circumferential direction in the axial portion 314.

[0047] The cylindrical member 320 has a first member 330 corresponding to the first member 230 and a second member 340 corresponding to the second member 240. The first member 330 has a first semi-cylindrical portion 331 corresponding to the first semi-cylindrical portion 131 , and does not have a portion corresponding to the first semi-annular portion 232 . The second member 340 has a second semi-cylindrical portion 341 corresponding to the second semi-cylindrical portion 141, but does not have a portion corresponding to the second semi-annular portion 242.

[0048] The first semi-cylindrical portion 331 and the second semi-cylindrical portion 341 form a cylindrical portion 321 that corresponds to the cylindrical portion 121. The cylindrical portion 321 is disposed outside the axial portion 314 of the annular member 310. The cylindrical portion 321 (in other words, the first semi-cylindrical portion 331 and the second semi-cylindrical portion 341) has fourth protrusions 323 that protrude in the radial direction from the inner circumferential surface. In this embodiment, a plurality of (for example, six) fourth protrusions 323 are provided in the circumferential direction at the end portion on the second side of the cylindrical portion 321.

[0049] The fourth protrusion 323 is molded to fit into a fourth through hole 315 formed in the annular member 310. More specifically, as shown in FIG. 10 , the fourth protrusion 323 has a pair of protrusions 324 aligned in the axial direction, and a recess 325 is formed between the pair of protrusions 324. The first-side end and the second-side end of the pair of protrusions 324 are molded to gradually protrude inward as they approach the recess 325. The second-side protrusion 324 of the pair of protrusions 324 fits into the fourth through hole 315, and a portion of the axial portion 314 of the annular member 310 on the first side of the fourth through hole 315 fits into the recess 325, thereby connecting the annular member 310 and the tubular member 320.

[0050] ((Assembly of the cover member 300)) In the cover member 300 configured as described above, the first member 330 and the second member 340 are each moved from the outside to the inside while positioned on the first side of the annular member 310 fixed to the rod 20. Then, similar to the cover member 100, the first member 330 and the second member 340 are joined together using the first protruding portion 135 and the first through hole 136 of the first member 330, and the second protruding portion 145 and the second through hole 146 of the second member 340.

[0051] Thereafter, the fourth protrusion 323 provided on the cylindrical portion 321 of the tubular member 320 is fitted into the fourth through-hole 315 formed in the annular member 310, thereby joining the annular member 310 and the tubular member 320 together. In this way, the annular member 310 and the cylindrical member 320 are integrated together to assemble the cover member 300.

[0052] As described above, the annular member 310 has an axial portion 314 (an example of a cylindrical portion) that protrudes in the axial direction from the outer periphery, and the cylindrical member 320 and the annular member 310 are connected by fitting a fourth protrusion 323 (an example of a convex portion) that protrudes inward from the inner surface of the cylindrical member 320 into a fourth through hole 315 (an example of a concave portion) formed in the axial portion 314 of the annular member 310. This makes it possible to easily connect the annular member 310 and the cylindrical member 320.

[0053] The manner in which the annular member 310 and the cylindrical member 320 are connected is not particularly limited. As long as the fourth protruding portion 323 and the fourth through hole 315 fit together, the shapes of the fourth protruding portion 323 and the fourth through hole 315 are not particularly limited. Furthermore, the fourth through hole 315 may not be a hole that passes through the axial portion 314, but may be a recess into which the fourth protruding portion 323 fits. Furthermore, the annular member 310 may have the fourth protruding portion 323, and the fourth through hole 315 may be formed in the cylindrical member 320.

[0054] Furthermore, in the above-described embodiment, the axial portion 314 of the annular member 310 is disposed inside the tubular member 320, but the tubular member 320 may be disposed inside the axial portion 314 of the annular member 310. The fourth protrusion 323 may protrude outward from the outer circumferential surface of the tubular member 320. Alternatively, a fourth through hole 315 may be formed in the tubular member 320, and the fourth protrusion 323 may protrude inward from the inner circumferential surface of the axial portion 314 of the annular member 310. [Explanation of symbols]

[0055] 1... shock absorber, 10... cylinder portion, 20... rod, 30... piston portion, 100, 200, 300... cover member, 110... annular member, 120... cylindrical member, 122, 222... annular portion (an example of an inward portion), 130... first member, 133... first mating surface (an example of a first connecting portion), 134... second mating surface (an example of a second connecting portion), 135, 137... first protruding portion (an example of a protruding portion), 136... first through Hole, 140...second member, 143...third mating surface (an example of a third connecting portion), 144...fourth mating surface (an example of a fourth connecting portion), 145...second protruding portion, 146...second through hole (an example of a through hole), 215...third through hole (an example of a through hole), 223, 227...third protruding portion (an example of a convex portion), 314...axial portion (an example of a cylindrical portion), 315...fourth through hole (an example of a concave portion), 323...fourth protruding portion (an example of a convex portion)

Claims

1. an annular member fixed to a rod protruding from a cylinder portion in which a fluid is sealed and covering one end of the cylinder portion; a cylindrical member connected to the annular member and surrounding the rod; Equipped with The cylindrical member is divided into a plurality of members in a direction intersecting the axial direction of the rod, and the members are brought close to each other in the intersecting direction and then connected. Cover member.

2. The cylindrical member includes a first member having a first connecting portion provided at one end of the rod in the circumferential direction and a second connecting portion provided at the other end of the rod in the circumferential direction, and a second member having a third connecting portion provided at the one end and connected to the second connecting portion, and a fourth connecting portion provided at the other end and connected to the first connecting portion. The cover member according to claim 1 .

3. The first connecting portion of the first member is provided with a protruding portion protruding from a surface in a direction intersecting the axial direction of the rod, a through hole through which the protrusion passes is formed in the fourth connecting portion of the second member, The tip of the protrusion is melted after passing through the through hole to be larger than the size of the through hole, thereby connecting the first member and the second member. The cover member according to claim 2 .

4. The first connecting portion of the first member is provided with a protruding portion protruding from a surface in a direction intersecting the axial direction of the rod, a through hole through which the protrusion passes is formed in the fourth connecting portion of the second member, The tip of the protrusion is larger than the size of the through hole, and the tip is elastically deformed when passing through the through hole and returns to its original shape after passing through the through hole, thereby connecting the first member and the second member. The cover member according to claim 2 .

5. The annular member and the cylindrical member are connected so as not to be separated in the axial direction of the rod. The cover member according to claim 1 .

6. The cylindrical member has an inwardly protruding portion at an end in the axial direction, and the inwardly protruding portion is located on the opposite side of the annular member from the cylinder portion, thereby suppressing movement of the annular member toward the cylinder portion. The cover member according to claim 5 .

7. the cylindrical member has, at an end in the axial direction, an inwardly protruding portion and a convex portion protruding in the axial direction from the inwardly protruding portion, The annular member has a through hole through which the protrusion passes, The tip of the protrusion is melted after passing through the through hole to make the tip larger than the size of the through hole, thereby connecting the cylindrical member and the annular member. The cover member according to claim 5 .

8. the cylindrical member has, at an end in the axial direction, an inwardly protruding portion and a convex portion protruding in the axial direction from the inwardly protruding portion, The annular member has a through hole through which the protrusion passes, a tip end of the protrusion is larger than the size of the through hole, and the protrusion is elastically deformed when passing through the through hole and returns to its original shape after passing through the through hole, thereby connecting the cylindrical member and the annular member; The cover member according to claim 5 .

9. the annular member has a cylindrical portion protruding in the axial direction from an outer circumferential portion, A convex portion protruding inward from the inner surface of the cylindrical member is fitted into a concave portion formed in the cylindrical portion of the annular member, thereby connecting the cylindrical member and the annular member. The cover member according to claim 5 .

10. a cylinder portion in which a fluid is sealed; a rod protruding from the cylinder portion; The cover member according to claim 1 , which covers the cylinder portion and a part of the rod; A shock absorber comprising:

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