Cap and suspension device

Abstract

To provide a cap in which a mounted part is unlikely to change in dimension even when it is press-fitted into a cylinder part.SOLUTION: A cap 100 is press-fitted into an end part of a cylinder part on a second side in a center line direction, and a dust cover is mounted so as to cover the periphery of a rod protruding from the cylinder part. The cap 100 comprises a protrusion part 112 press-fitted into the cylinder part, and a protrusion part 126 to which the dust cover is mounted and whose starting point 129 is provided on the second side with respect to the protrusion part 112.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a cap and a suspension system. [Background technology]

[0002] For example, the hydraulic shock absorber described in Patent Document 1 restricts the maximum compression stroke by causing the bump rubber to abut against a bump stopper cap on the upper end surface of the damper tube at the time of maximum compression. The hydraulic shock absorber described in Patent Document 1 also has a dust cover provided in the annular space inside the coil spring and outside the bump rubber. The dust cover is integrally molded with the lower end of the seat rubber provided on the upper spring seat, and the lower end of the dust cover is engaged with a cover receiver provided on the damper tube, covering the damper tube and the piston rod. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-154355 A Summary of the Invention [Problem to be solved by the invention]

[0004] In order to fix the bump stopper cap, which has a portion that receives the impact of the bump rubber at maximum compression and a portion where the dust cover is attached (hereinafter sometimes referred to as the "attached portion." In Patent Document 1, the cover receiver is the attached portion), to the cylinder portion, it is possible to press the bump stopper cap into the cylinder portion (the damper tube in Patent Document 1). If the dimensions of the attached portion change due to pressing the bump stopper cap into the cylinder portion, it may become difficult to attach the dust cover to the attached portion or the dust cover may easily come off from the attached portion after attachment. An object of the present invention is to provide a cap or the like whose attached portion is unlikely to change in dimension even when pressed into a cylinder portion. [Means for solving the problem]

[0005] The present invention, which was completed with this objective in mind, is a cap that is press-fitted into one end of a cylinder portion in the center line direction and has a dust cover attached to cover the periphery of a rod protruding from the cylinder portion, the cap comprising a press-fit portion that is press-fitted into the cylinder portion, and a mounted portion to which the dust cover is attached and whose starting portion is located on the one side of the press-fit portion. Effect of the Invention

[0006] According to the present invention, the dimensions of the mounted portion are unlikely to change even when the mounted portion is press-fitted into the cylinder portion. [Brief description of the drawings]

[0007] [Figure 1] 1 is a diagram showing an example of a schematic configuration of a suspension device according to a first embodiment. [Diagram 2] 3A and 3B are diagrams illustrating an example of the appearance of the cap according to the first embodiment. [Diagram 3] 3 is a diagram showing an example of a cross-sectional shape of the III-III portion of FIG. 2. [Figure 4] 13 is a diagram showing an example of the appearance of a cap according to a second embodiment. FIG. [Diagram 5] 5 is a diagram showing an example of a cross-sectional shape of the VV portion in FIG. 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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 suspension device 1 according to the first embodiment. The suspension system 1 is a suspension used in four-wheeled vehicles such as passenger automobiles, and as shown in Fig. 1, comprises a hydraulic shock absorber 2 and a coil spring 3 arranged on the outside of the shock absorber 2. The suspension system 1 also comprises a lower spring sheet 4 that supports an end of the coil spring 3 on a first axial side (lower side in Fig. 1) of a rod 20 described below, and an upper spring sheet 5 that supports an end of the coil spring 3 on a second axial side (upper side in Fig. 1) of the rod 20.

[0009] The suspension device 1 also includes a vehicle body side bracket 6 for mounting the suspension device 1 to a vehicle, a wheel side bracket 7 for mounting the suspension device 1 to a wheel, a dust cover 8 that covers at least a portion of the cylinder portion 10 and the rod 20, and a bumper rubber 9. Hereinafter, the axial direction of the rod 20 may be simply referred to as the "axial direction." Also, the first axial side (lower side in FIG. 1) and the second axial side (upper side in FIG. 1) may be simply referred to as the "first side" and the "second side," respectively. Also, the direction intersecting the axial direction (e.g., the 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 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."

[0010] The shock absorber 2 will be described in detail below. The shock absorber 2 includes a cylinder portion 10 that contains oil, and a rod 20 whose second end protrudes from the cylinder portion 10 and whose first end is inserted into the cylinder portion 10. The shock absorber 2 also includes a piston portion 30 provided at the first end of the rod 20, and a bottom portion 40 provided at the first end of the cylinder portion 10. The shock absorber 2 also includes a bump stopper cap (hereinafter sometimes referred to as a "cap") 100 that is press-fitted into the second end of the cylinder portion 10 and receives the load of the bump rubber 9 generated during compression to regulate the maximum compression stroke.

[0011] The cylinder portion 10 has a cylinder 11 that contains oil, and an outer cylinder body 12 that is provided on the outside of the cylinder 11. The cylinder portion 10 also includes a rod guide portion 15 that movably supports a rod 20, and an oil seal 16 that prevents oil from leaking from within the cylinder portion 10 and prevents foreign matter from entering the cylinder portion 10. The rod 20 is a bar-shaped member that extends long in the axial direction. The rod 20 holds the piston portion 30 on a first side. The rod 20 is connected to, for example, a vehicle body via a bracket 6 on the vehicle body side on a second side.

[0012] The cylinder portion 10 and the rod 20 configured as above are assembled as follows. That is, the cylinder 11 with the bottom portion 40 pressed into the inside is inserted into the outer cylindrical body 12 of the cylinder portion 10. Then, the rod 20 holding the piston portion 30 at the end on the first side is inserted into the cylinder 11 from the piston portion 30 side. Then, the rod guide portion 15 and the oil seal 16 are inserted into the outer cylindrical body 12, and the end on the second side of the outer cylindrical body 12 is bent inwardly, that is, so-called roll crimping is performed, thereby fixing the rod guide portion 15 and the oil seal 16 to the cylinder 11 and the crimped portion 13 of the outer cylindrical body 12.

[0013] (Cap 100) Next, the cap 100 according to the first embodiment will be described. FIG. 2 is a diagram showing an example of the appearance of the cap 100 according to the first embodiment. FIG. 3 is a diagram showing an example of a cross-sectional shape taken along line III-III of FIG. The cap 100 includes a first member 110 that is press-fitted into the cylinder portion 10, and a second member 120 that is welded to the first member 110.

[0014] The first member 110 has a cylindrical tubular portion 111 and an apex portion 116 that protrudes inward from the end portion of the tubular portion 111 on the second side. The cylindrical portion 111 has a protrusion 112 protruding inward at the end on the second side. A plurality of protrusions 112 (four in the first embodiment) are provided at equal intervals in the circumferential direction (hereinafter, sometimes simply referred to as the "circumferential direction") of the cylinder portion 10. When viewed in the center line direction, the inner portion of the protrusion 112 is formed in an arc shape. The diameter of an imaginary circle formed by the innermost portions of the plurality of protrusions 112 is smaller than the diameter of the end on the second side of the outer cylinder body 12 of the cylinder portion 10. Alternatively, the distance between two of the plurality of protrusions 112 facing each other across the center line of the cylindrical portion 111 is smaller than the diameter of the end on the second side of the outer cylinder body 12 of the cylinder portion 10. The top portion 116 has a through hole 117 formed in the center thereof for passing the rod 20 therethrough. The first member 110 can be formed, for example, by pressing a steel plate.

[0015] The second member 120 has an annular portion 121 having a circular ring shape, and a protruding portion 126 that protrudes outward from the outer end portion of the annular portion 121. A through hole 122 for passing the rod 20 is formed in the center of the annular portion 121. The size of the through hole 122 may be the same as the size of the through hole 117 of the first member 110, for example. A plurality of protruding portions 126 (three in the first embodiment) are provided at equal intervals in the circumferential direction. Protruding portion 126 is provided on the outside of cylindrical portion 111 of first member 110, and has parallel portion 127 parallel to the center line direction. Protruding portion 126 also has tip portion 128 protruding outward from the end portion on the first side of parallel portion 127. The second member 120 can be formed, for example, by pressing a steel plate.

[0016] The first member 110 and the second member 120 are joined by welding the top portion 116 and the annular portion 121 of the second member 120 in a state in which the annular portion 121 of the second member 120 is placed on the top portion 116 of the first member 110. The radial position of the welded portion 130 between the top portion 116 and the annular portion 121 can be, for example, the center portion of the annular portion 121, and the circumferential position of the welded portion 130 can be, for example, the position where the protruding portion 126 is provided. However, the position of the welded portion 130 is not particularly limited as long as welding is performed on the overlapping portion of the top portion 116 and the annular portion 121.

[0017] The cap 100 is fitted into the second end of the cylinder portion 10 from the first opening of the tubular portion 111 of the first member 110, and is pressed into the cylinder portion 10 until the first side surface of the top portion 116 of the first member 110 contacts the crimped portion 13 of the cylinder portion 10. As described above, since the diameter of the imaginary circle formed by the multiple protrusions 112 is smaller than the diameter of the outer cylindrical body 12 of the cylinder portion 10, the multiple protrusions 112 are pressed into contact with the outer peripheral surface of the outer cylindrical body 12. Therefore, the protrusions 112 function as a press-fit portion that is pressed into the cylinder portion 10.

[0018] 1, the first end of the dust cover 8 is hooked onto a tip 128 of a protruding portion 126 of the second member 120 disposed on the second side of the first member 110, thereby attaching the dust cover 8 to the cap 100. Therefore, the protruding portion 126 of the second member 120 functions as a mounting portion to which the dust cover 8 is mounted. Also, the bump rubber 9 comes into contact with the annular portion 121 of the second member 120 during compression.

[0019] As described above, the cap 100 is press-fitted into the end portion on the second side, which is an example of one side in the center line direction of the cylinder portion 10, and the dust cover 8 is attached to cover the periphery of the rod 20 protruding from the cylinder portion 10. The cap 100 includes the protrusion 112, which is an example of a press-fit portion that is press-fitted into the cylinder portion 10, and the protrusion 126, which is an example of a mounted portion, to which the dust cover 8 is attached and whose starting point portion 129 (see FIG. 2) is provided on the second side of the protrusion 112.

[0020] In the cap 100 configured as described above, since the protrusions 112 are press-fitted into the cylinder portion 10, for example, the distance between the two opposing protrusions 112 becomes larger than before the press-fitting. Then, the radial size of the part of the cylindrical portion 111 on which the protrusions 112 are provided, which is on the first side of the protrusions 112, changes. In contrast, the second member 120 is provided on the second side of the first member 110, and the starting point 129 of the protrusion 126, which starts to protrude outward from the annular portion 121, is provided on the second side of the protrusion 112. Therefore, the dimension of the protrusion 126 is unlikely to change even if the cylindrical portion 111 of the first member 110 is press-fitted into the cylinder portion 10. In other words, the dimension of the protrusion 126 is unlikely to change before and after the protrusion 126 is press-fitted into the cylinder portion 10. As a result, a worker who attaches the dust cover 8 to the cap 100 can easily attach the dust cover 8 to the tip end 128 of the protrusion 126. In addition, the attached dust cover 8 is unlikely to come off the tip 128 of the protrusion 126.

[0021] Here, the cap 100 includes a cylindrical portion 111 that covers the periphery of the outer circumferential surface of the cylinder portion 10, a top portion 116 that is provided at the end of the second side of the cylindrical portion 111 to cover the opening of the cylindrical portion 111, and a second member 120 (an example of a flat portion) in which a through hole 117 and a through hole 122 (an example of a hole) through which the rod 20 passes are formed. A convex portion 112 as an example of a press-fit portion is provided on the cylindrical portion 111, and a protruding portion 126 as an example of a mounted portion is provided on the second member 120. In other words, the cap 100 includes a first member 110 having the cylindrical portion 111 and the top portion 116 that is a part of the flat portion, and a second member 120 having a part of the flat portion. The second member 120 is welded to the top portion 116 of the first member 110.

[0022] The protruding portions 126 are portions that protrude outward from the annular portion 121 as an example of a portion that covers the opening of the tubular portion 111 in the second member 120, and a plurality of protruding portions 126 are provided in the circumferential direction of the cylinder portion 10. A welded portion 130, which is a welding portion between the first member 110 and the second member 120, is between the adjacent protruding portions 126. 2, a plurality of protrusions 112 as an example of a press-fit portion are provided in the circumferential direction. However, the protrusions 112 may be provided over the entire circumferential direction.

[0023] Although the protruding portion 126 of the second member 120 according to the first embodiment has a shape having a parallel portion 127 parallel to the center line direction, the shape is not particularly limited to this aspect. For example, the protruding portion 126 may be inclined toward the center line direction over the entire area from the starting point portion 129 to the tip portion 128, like the protruding portion 226 according to the second embodiment described later with reference to Figures 4 and 5.

[0024] <Second embodiment> FIG. 4 is a diagram showing an example of the appearance of the cap 200 according to the second embodiment. FIG. 5 is a diagram showing an example of a cross-sectional shape of the VV portion in FIG. The cap 200 according to the second embodiment differs from the cap 100 according to the first embodiment in that it is molded from a single member. The differences from the first embodiment will be described below. The same reference numerals are used for the same parts in the first and second embodiments, and detailed descriptions thereof will be omitted.

[0025] The cap 200 includes a cylindrical tubular portion 210 and a flat plate portion 220 provided at a second end of the tubular portion 210. The cap 200 can be formed, for example, by pressing a steel plate.

[0026] The cylindrical portion 210 has a protrusion 212 protruding inward at the end on the first side. A plurality of the protrusions 212 (four in the second embodiment) are provided at equal intervals in the circumferential direction. When viewed in the center line direction, the inner portion of the protrusion 212 is formed in an arc shape. The diameter of an imaginary circle formed by the innermost portions of the plurality of protrusions 212 is smaller than the diameter of the end on the second side of the outer cylinder body 12 of the cylinder portion 10. Alternatively, the distance between two of the plurality of protrusions 212 facing each other across the center line of the cylindrical portion 210 is smaller than the diameter of the end on the second side of the outer cylinder body 12 of the cylinder portion 10.

[0027] A plurality of (three in the second embodiment) notches 213 are formed in the end portion on the second side of the cylindrical portion 210. The notches 213 have a rectangular shape when viewed radially from the outside. The plurality of notches 213 are formed at equal intervals in the circumferential direction. The circumferential positions at which the notches 213 are formed are different from the positions at which the protruding portions 212 are provided. Furthermore, the positions in the center line direction at which the notches 213 are formed are different from the positions in the center line direction at which the protruding portions 212 are provided.

[0028] The flat plate portion 220 has an annular portion 221 having a circular ring shape and a protruding portion 226 protruding outward from the outer end portion of the annular portion 221 . The annular portion 221 has a through hole 222 formed in the center thereof for passing the rod 20 therethrough. A plurality of protruding portions 226 (three in the second embodiment) are provided at equal intervals in the circumferential direction. The protruding portions 226 are inclined in the center line direction from a starting point 229 where the protruding portions 226 start to protrude outward from the annular portion 221 so that a tip portion 228 is located outside the cylindrical portion 210 and on the first side of the annular portion 221. The protruding portions 226 are formed so that the circumferential size at the tip portion is smaller than the circumferential size at the starting point 229, and the circumferential size gradually decreases from the starting point 229 to the tip portion 228. The size of the protruding portions 226 is smaller than the size of the notch 213 of the cylindrical portion 210. In other words, the notch 213 is formed in the cylindrical portion 210 in order to form the protruding portions 226.

[0029] The cap 200 is fitted into the end of the second side of the cylinder portion 10 from the opening on the first side of the tubular portion 210, and is press-fitted into the cylinder portion 10 until the surface on the first side of the annular portion 221 of the flat plate portion 220 contacts the crimped portion 13 (see FIG. 1) of the cylinder portion 10. As described above, since the diameter of the imaginary circle formed by the multiple protrusions 212 is smaller than the diameter of the outer cylinder body 12 of the cylinder portion 10, the multiple protrusions 212 are press-fitted so as to contact the outer circumferential surface of the outer cylinder body 12. Therefore, the protrusions 212 function as press-fitting portions that are press-fitted into the cylinder portion 10.

[0030] Then, the first end of the dust cover 8 is hooked onto the tip 228 of the protruding portion 226 of the flat portion 220, whereby the dust cover 8 is attached to the cap 200. Therefore, the protruding portion 226 of the flat portion 220 functions as a mounting portion to which the dust cover 8 is mounted. Also, the bump rubber 9 comes into contact with the annular portion 221 of the flat portion 220 during compression.

[0031] As described above, the cap 200 is press-fitted into the end portion on the second side, which is an example of one side in the center line direction of the cylinder portion 10, and the dust cover 8 is attached to cover the periphery of the rod 20 protruding from the cylinder portion 10. The cap 200 includes the protrusion 212, which is an example of a press-fit portion that is press-fitted into the cylinder portion 10, and the protrusion 226, which is an example of a mounted portion, to which the dust cover 8 is attached and whose starting point portion 229 is provided on the second side of the protrusion 212.

[0032] In the cap 200 configured as described above, the convex portion 212 of the cylindrical portion 210 is press-fitted into the cylinder portion 10, so that, for example, the distance between the two opposing convex portions 212 becomes larger than before the press-fitting. In contrast, the flat portion 220 is provided on the second side of the convex portion 212, and the starting point portion 229 of the protruding portion 226, which starts to protrude outward from the annular portion 221, is provided on the second side of the convex portion 212. In addition, the circumferential position at which the protruding portion 226 is provided is a position different from the circumferential position at which the convex portion 212 is provided, and is the position at which the notch 213 is formed. Therefore, the dimension of the protruding portion 226 is unlikely to change even if the cylindrical portion 210 is press-fitted into the cylinder portion 10. In other words, the dimension of the protruding portion 226 is unlikely to change before and after the press-fitting into the cylinder portion 10. As a result, a worker who attaches the dust cover 8 to the cap 200 can easily attach the dust cover 8 to the tip portion 228 of the protruding portion 226. In addition, the attached dust cover 8 is unlikely to come off the tip 228 of the protrusion 226.

[0033] In addition, the cap 200 has the cylindrical portion 210 and the flat portion 220 molded integrally. Therefore, the cap 200 can reduce the number of parts compared to the cap 100, which is composed of two parts. Note that a ring-shaped member (not shown) having a through hole formed in the center for passing the rod 20 therethrough may be provided on the second side of the cap 200 so that the bump rubber 9 comes into contact with the ring-shaped member when compressed. This ring-shaped member may be welded to the flat portion 220 of the cap 200.

[0034] Note that the protruding portion 226 according to the second embodiment is inclined in the center line direction over the entire area from the starting point 229 to the tip portion 228, but is not particularly limited to this aspect. For example, the protruding portion 226 may have a parallel portion (not shown) parallel to the center line direction, like the protruding portion 126 according to the first embodiment described using Figures 2 and 3, and the tip portion 228 may be configured at a portion that protrudes outward from the end portion on the first side of the parallel portion. [Explanation of symbols]

[0035] 1...suspension device, 2...shock absorber, 8...dust cover, 10...cylinder portion, 12...outer cylinder body, 20...rod, 30...piston portion, 100, 200...cap, 110...first member, 112, 212...projection portion (an example of a press-fit portion), 116...top portion, 117, 122, 222...through hole, 120...second member, 126, 226...projection portion (an example of a mounted portion), 129, 229...starting point portion, 220...flat plate portion

Claims

1. A cap is press-fitted into one end of a cylinder portion in a center line direction and has a dust cover attached thereto to cover a periphery of a rod protruding from the cylinder portion, a press-fit portion that is press-fitted into the cylinder portion; a mounting portion to which the dust cover is mounted and a start point portion is provided on the one side of the press-fit portion; A cap comprising:

2. A cylindrical portion covering the periphery of an outer circumferential surface of the cylinder portion; a flat plate-like portion provided at the one end of the cylindrical portion to cover an opening of the cylindrical portion and having a hole through which the rod passes; Equipped with The press-fit portion is provided on the cylindrical portion, The mounting portion is provided on the flat plate portion. The cap of claim 1.

3. The mounting portion is a portion that protrudes outward from a portion of the flat plate portion that covers the opening, and is provided in a circumferential direction of the cylinder portion. The cap according to claim 2.

4. The press-fit portion is provided over the entire circumferential area of ​​the cylinder portion, or a plurality of press-fit portions are provided in the circumferential direction. The cap according to claim 2.

5. a first member having the cylindrical portion and a top portion that is a part of the flat portion; and a second member having a part of the flat portion; Equipped with The second member is welded to the top of the first member. The cap according to claim 2.

6. The welding points between the first member and the second member are between the adjacent attached portions. The cap according to claim 5.

7. The cylindrical portion and the flat portion are integrally formed. The cap according to claim 2.

8. A cap according to any one of claims 1 to 7; a cylinder portion into which the cap is press-fitted; A dust cover attached to the cap; A suspension device comprising:

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