TWI624607B - Combination device of dust cover and combination method of dust cover - Google Patents

Abstract

The present invention provides an operation capable of reducing fixing to an annular member A combination method of a dust cover that is a burden.

The pillar (33) is inserted into the bag shape In the body (10), the pocket portion (11) covers the head portion (34) of the top end of the pillar (33). The cylinder block (32, 46) abuts against the abutting member of the spring rubber seat (100) in a state where the bag body (10) is restricted to the spring rubber seat (100) by the stopper device (60) ( 51) Relative movement of the strut (33) in the axial direction to break the fragile portion (20). When the fragile portion (20) is broken, the body tubular portion (2) is prevented from entering the spring rubber seat (100), and the positional deviation of the main body tubular portion (2) can be prevented, so that the main tubular portion (2) can be reduced to the spring rubber. The operational burden on the seat (100).

Description

Combination device of dust cover and combination method of dust cover

The present invention relates to a combination device of a dust cover and a method of combining the dust cover, and more particularly to a combination device of a dust cover and a dust cover which can reduce the operational load fixed to the annular member.

A dust cover for preventing dust from entering between the piston rod and the guide rod or the like is attached to the damper in the suspension mechanism of the automobile (for example, Patent Document 1). In the technique disclosed in Patent Document 1, the axial end portion of the tubular member is fixed to an annular member (cylindrical metal member) attached to the vehicle body side, and a dust cover is provided to surround the circumference of the piston rod. (tubular parts).

[Prior patent documents]

[Patent Literature]

Patent Document 1: Japanese Patent Laid-Open Publication No. Hei 7-239030

However, in the above-described prior art, since the operation of fixing the dust cover on the annular member attached to the vehicle body side is cumbersome, there is a problem that the operation load is large.

The present invention has been made to solve the above problems, and an object thereof is to provide a combination of a dust cover capable of reducing an operation load fixed to an annular member. A combination method of the device and the dust cover.

[The means to solve the problem and the efficacy of the invention]

In order to achieve the object, according to the combination device of the dust cover of the first aspect of the invention, the dust cover is manufactured in which the cylindrical body tubular portion is disposed so as to surround the outer circumference of the piston rod of the damper of the vehicle, and the main body cylinder portion is mounted on The annular part on the side of the vehicle body is combined. In the main body tubular portion, the bag portion is connected to the axial end portion, and a weak portion that is more likely to be broken than the main body tubular portion is formed in the bag portion in the circumferential direction. A pillar is inserted into a bag-like body that is connected to the axial end of the body portion of the body portion, and the pocket portion covers the head portion provided on the tip end of the pillar. The abutting member connected to the support member is disposed so as to be able to abut against an end surface on the axial side of the annular member into which the pocket portion covering the head portion is inserted. The abutting member and the strut are relatively moved in the axial direction by the driving device, and the interpolating end portion between the fragile portion of the pocket portion inserted and fixed to the annular member and the main body tubular portion is restricted by the stopper. In a state in which the insertion end portion is limited to the annular member by the stopper, the abutting member that abuts against the annular member moves relative to the strut in the axial direction to break the fragile portion. Thereby, it is possible to prevent the main body tubular portion from entering the annular member when the fragile portion is broken. Since it is possible to prevent the positional deviation of the tubular portion of the main body fixed to the annular member, it is possible to reduce the operational burden of fixing the tubular portion of the main body to the annular member.

According to the combination device of the second aspect of the invention, in the stopper device, the plurality of opening and closing members disposed around the pillar are opened and closed in the radial direction. When the opening and closing member is opened, the outer end portion abuts against the insertion end portion, and when the opening and closing member is closed, the outer end portion is separated from the interpolating end portion. Therefore, in addition to the effect of the first aspect of the patent application, the opening and closing member is prevented from obstructing the operation of the bag-like body covering the pillar and the head, and the workability can be ensured.

According to the combination device of the third aspect of the invention, the bag portion forms an engaged portion on the axial side of the fragile portion, and the head portion is provided with the engagement with the engaged portion when the fragile portion is broken. unit. When the fragile portion is broken, the engaged portion of the pocket portion engages with the engaging portion of the head portion, thereby preventing the end portion of the pocket portion cut away from the fragile portion from being detached from the head portion. Thus, in addition to the effects of the first or second aspect of the patent application, it is possible to prevent a part of the fragile portion from remaining without being broken, and to have an effect of reliably breaking the fragile portion over the entire circumference.

According to the method of assembling a dust cover according to the fourth aspect of the invention, the cylindrical body tubular portion is disposed so as to surround the outer circumference of the piston rod of the damper of the vehicle, and the main body tubular portion and the ring attached to the vehicle body side are manufactured. A dust cover that is combined with a component. a bag-shaped body that is connected to the axial end portion of the main body tubular portion by the preparation process preparation bag portion, and the bag portion forms a weak portion that is more likely to be broken than the main body tubular portion in the circumferential direction; and the bag-like body bag is covered by the covering process The part covers the head set at the top of the pillar. By the fixing process, the pocket portion is inserted into the annular member, and the interposed end portion between the fragile portion and the main body tubular portion is fixed to the annular member. The end portion fixed to the annular member is limited to the annular member from the radially inner side by the limiting step. In the state in which the end portion is restrained by the annular member by the removal process, the annular member and the strut are relatively moved in the axial direction to break the fragile portion, and the interpolated end portion fixed to the annular member is retained. Remove the axial end side. Thereby, it has the same effect as the first item of the patent application range.

1‧‧‧ dust cover

2‧‧‧ Body tube

3‧‧‧Open end

4‧‧‧Interpolated end

5‧‧‧Outreach

10, 70‧‧‧ pockets

11‧‧‧ Bag Department

11a‧‧‧Rejection Department

12‧‧‧ base

13‧‧‧Top part

14‧‧‧Slots

15‧‧‧Contacting the face

16‧‧‧The outer part

17‧‧‧ recess

18‧‧‧ convex part (to be engaged)

20‧‧‧ Fragile Department

21‧‧‧ slitting

22‧‧‧Connecting Department

30, 80‧‧‧ combination device

31‧‧‧Department

32‧‧‧Cylinder (drive unit)

33‧‧‧ pillar

34, 81‧‧‧ head

35‧‧‧Abutment

36‧‧‧Conical surface

37‧‧‧Insert through hole (engagement part)

38‧‧‧ pit

39‧‧‧Bolts

40‧‧‧Springs (elastic parts)

41‧‧‧ wall

42‧‧‧ top surface

43‧‧‧ side panels

44‧‧‧Intermediate board

45‧‧‧ top board

46‧‧‧Cylinder (drive unit)

47‧‧‧ piston rod

48‧‧‧Support parts

49‧‧‧ Hole Department

50‧‧‧Springs (elastic parts)

51‧‧‧Resist parts

52‧‧‧ Hole Department

60‧‧‧ Limiting device

61‧‧‧ Drive Department

62‧‧‧Opening and closing parts

62a‧‧‧Upper end face

63‧‧‧Outer end

64‧‧‧Slope

65‧‧‧ Subject

66‧‧‧Piston

67‧‧‧ cam

71‧‧‧ Hole Department (Bed Department)

82‧‧‧Bolt (engagement part)

100‧‧‧Spring rubber seat (ring part)

101‧‧‧ Main body

102‧‧‧Flange

103‧‧‧Protruding

110‧‧‧ Shock absorbers

111‧‧‧Cylinder block

112‧‧‧ piston rod

113‧‧‧ coil spring

201‧‧‧Molding die

202‧‧‧Forming mould

203‧‧‧ cavity

204‧‧‧ nozzle

205‧‧‧Blank

206‧‧‧Blowing needle

210‧‧‧Molded body

A‧‧‧ cut line

B‧‧‧ cut line

D‧‧‧

O‧‧‧ axis

T‧‧‧ thickness

Fig. 1 is an axial cross-sectional view showing a suspension mechanism to which a dust cover according to an embodiment of the present invention is attached.

Fig. 2 is a perspective view of a bag body processed by the combination device of the first embodiment.

3 is a schematic view for explaining a method of combining the bag-shaped bodies, wherein (a) is a schematic view showing an extrusion process of the parison, (b) is a schematic view showing a gas blowing process, and (c) is a mold release and final processing. Schematic diagram of the process.

Figure 4 is a cross-sectional view of the fragile portion.

Figure 5 is an axial cross-sectional view of the combination of the dust cover.

Figure 6 is a cross-sectional view of the combination device taken along line VI-VI of Figure 5 .

Figure 7 is a cross-sectional view of the combination device inserted into the bag.

Figure 8 is a cross-sectional view of a combination device for inserting a bag into an annular member.

Figure 9 is a side view of the bag body.

Fig. 10 is a cross-sectional view of a combination device for breaking a part of a fragile portion.

Fig. 11 is a cross-sectional view showing a combination device for breaking all of the fragile portions.

Figure 12 is a cross-sectional view of the combined device after the fragile portion has been broken.

Fig. 13 is a perspective view of a bag body processed by the combination device of the second embodiment.

Figure 14 is an axial cross-sectional view of the combination device.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, a schematic configuration of a dust cover 1 according to a first embodiment of the present invention will be described with reference to Fig. 1 . Fig. 1 is an axial sectional view showing a suspension mechanism to which the dust cover 1 of the first embodiment is attached. The suspension mechanism is a member that connects the upper end of the damper 110 whose lower end is connected to the wheel (not shown) side to the side of the vehicle body frame (not shown) by a fixing device (not shown), thereby being used for The wheels can go up and down The direction is rocked and suspended in the frame of the vehicle body. In FIG. 1, for the sake of easy understanding, the illustration of the vehicle body (vehicle frame) and the fixing device is omitted, and a part of the damper 110 and the coil spring 113 in the axial direction (up and down direction of FIG. 1) is omitted.

As shown in Fig. 1, in the suspension mechanism, a lower end portion (not shown) of the coil spring 113 is fixed to the cylinder 111 of the damper 110, and an upper end portion of the coil spring 113 and a fixing device (not shown) A spring rubber seat 100 (annular member) is provided between the support seats. The vibration transmitted from the wheel side to the vehicle body frame side via the damper 110 is reduced by the fixing device, and the vibration transmitted from the wheel side to the vehicle body frame side by the coil spring 113 is reduced by the spring rubber seat 100.

The spring rubber seat 100 includes a main body portion 101 that is formed in an annular shape as viewed in the axial direction (vertical direction in FIG. 1), and a flange portion 102 that is formed to protrude radially outward from the main body portion 101. A rubber-like elastic body having a suitable spring constant is integrally formed. In the present embodiment, the spring rubber seat 100 includes a protruding portion 103 that protrudes in an annular shape from the inner peripheral edge of the one end side (the lower side in FIG. 1) of the main body portion 101 in the axial direction.

The dust cover 1 is a thin-walled tubular member for preventing dust from entering the damper 110, and includes a main body tubular portion 2, an open end portion 3, and an interposing end portion 4, and the main body tubular portion 2 is disposed to surround the damper 110. The outer circumference of the piston rod 112; the opening end portion 3 is disposed at an outer peripheral portion of the cylinder block 111; the insertion end portion 4 is disposed at a distal end side of the piston rod 112, and the spring rubber seat is simultaneously inserted into the main body of the spring rubber seat 100 Part 101; these components are integrally formed.

The main body tubular portion 2 is formed in a bellows shape in order to ensure elasticity in the axial direction, and a flange-like projecting portion 5 that protrudes outward in the radial direction is formed at an end portion in the axial direction. The projecting portion 5 is a portion for dividing the body tubular portion 2 and the insertion end portion 4 in the axial direction, There is an outer diameter that can abut against the axial end surface (the lower side surface of Fig. 1) of the main body portion 101 of the spring rubber seat 100. The insertion length of the insertion end portion 4 to the main body portion 101 of the spring rubber seat 100 is determined by the extension portion 5.

In the present embodiment, the dust cover 1 is integrally molded from a thermoplastic resin. As the thermoplastic resin, various thermoplastic high elastic materials such as a polyolefin resin such as polypropylene or polyethylene, a polyamide resin, a polyvinyl chloride resin, a polyester resin, a urethane resin, or a styrene resin can be used. The polyolefin resin such as polypropylene is appropriately selected by mixing and dispersing the ethylene propylene rubber. Further, the dust cover 1 may be formed of a rubber elastic body.

Next, the bag-like body 10 used when the insertion end portion 4 of the dust cover 1 is inserted into the main body portion 101 of the spring rubber seat 100 will be described with reference to Fig. 2 . FIG. 2 is a perspective view of the bag body 10.

As shown in Fig. 2, the bag-like body 10 is a molded body in which the bag portion 11 whose diameter is narrower than the main body tube portion 2 and the axial end portion of the main body tube portion 2 on the opposite side of the opening end portion 3 is connected. . The bag portion 11 includes a base portion 12 that is connected to the main body tubular portion 2 (projecting portion 5) and formed into a substantially cylindrical shape, and a substantially conical top end that is connected to the base portion 12 and gradually decreases in diameter toward the axial end portion. Part 13. In the present embodiment, the pocket portion 11 is formed in a hollow shape in which the axial end portion (tip) is closed.

The base portion 12 includes a groove-shaped groove portion 14 (see FIG. 1 ) that is formed to extend in the circumferential direction along the extension portion 5 , and an axial end portion (tip side) that faces the groove portion 14 and faces the spring rubber seat 100 . The outer peripheral portion 16 of the inner peripheral surface of the main body portion 101. In the present embodiment, the outer peripheral portion 16 is formed in a truncated cone shape whose diameter gradually decreases toward the axial end portion (upper side in FIG. 2). The base portion 12 is located at a recess 17 closer to the axis O than the outer peripheral portion 16, and is recessed at a predetermined interval in the circumferential direction. A plurality of (16 in the present embodiment) positions are provided in an axisymmetric shape. The concave portion 17 is formed in a substantially elliptical shape extending in the axial direction (vertical direction in FIG. 2) as viewed from the side.

The distal end portion 13 is a pocket portion connected to the base portion 12, and a convex portion 18 (engaged portion) is formed at the top portion. The convex portion 18 is located on the axis O and is a portion that protrudes from the top surface of the distal end portion 13 toward the back surface (the side of the opening end portion 3). The convex portion 18 is formed when the bag body 10 is molded (see later).

The bag body 10 is provided with a fragile portion 20 at the base portion 12 of the bag portion 11. The fragile portion 20 is a portion that is more likely to be broken than the main body tubular portion 2 or the distal end portion 13 and is provided along the overhang portion 5 over the entire circumferential direction. In the present embodiment, the fragile portion 20 includes a slit 21 that penetrates in the thickness direction of the outer peripheral portion 16 and extends in the circumferential direction, and a connecting portion 22 that is provided in the concave portion 17 on both sides in the circumferential direction of the slit 21, The sewing machine has a pinhole shape extending in the circumferential direction of the base portion 12 as a whole. The bag portion 11 is separated from the bag body 10 by the fragile portion 20, whereby the dust cover 1 is manufactured.

Next, an example of a method of combining the pouch bodies 10 will be described with reference to Fig. 3 . In the present embodiment, a case where the bag body 10 is manufactured by a blow molding method will be described. 3 is a schematic view for explaining a method of combining the bag-like bodies 10. FIG. 3(a) is a schematic view showing an extrusion process of the parison 205, and FIG. 3(b) is a schematic view showing a gas injecting process. (c) in Fig. 3 is a schematic view showing the demolding and the final processing steps.

As shown in FIG. 3( a ), a pair of molding dies 201 and 202 having the inner surface of the cavity 203 corresponding to the outer shape of the dust cover 1 are prepared, and in the extrusion process, the nozzle 204 is heated by heating. The parison 205 of the softened molding material is extruded in a cylindrical shape and disposed between the molding dies 201 and 202.

Next, as shown in FIG. 3(b), the molding dies 201 and 202 are brought close to each other, and the parison 205 is extrusion-deformed at the upper and lower ends, thereby the cavity 203 (refer to (a) of FIG. 3). The inner parison 205 is configured in a bag shape. In the gas injecting step, the air is blown from the hollow portion of the parison 205 from the fitting of the top of the molding die 201, 201 by using the blowing needle 206, and the parison 205 is expanded and deformed in the radial direction, and is pressed into the cavity 203. surface. Thereby, the molded body 210 of a predetermined shape is molded.

The molded molds 201 and 202 are cooled to cool and solidify the molded body 210. Next, as shown in FIG. 3(c), the blow pins 206 are raised, and the molding dies 201 and 202 are separated from each other to be released, and the molded body 210 is taken out from the molding dies 201 and 202. A burr (protrusion 18) generated by the blow pin 206 is left at the top of the molded body 210.

In the final processing step, the one end side in the axial direction of the molded body 210 is cut (cut) at the cutting line A by using a cutter (not shown) to form the opening end portion 3 (see FIG. 2). Further, the other end side in the axial direction of the molded body 210 is cut by the cutter (not shown) from the outer side in the radial direction at the cutting line B (the slit 21 and the joint portion 22 are formed), thereby forming the fragile portion 20 ( Refer to Figure 2). Thereby, the thin-walled bag body 10 is manufactured.

The fragile portion 20 will be described with reference to Fig. 4 . 4 is a cross-sectional view of the fragile portion 20 perpendicular to the axis O of the bag body 10. As shown in FIG. 4, the bag-like body 10 is provided with a plurality of recesses 17 provided in the outer peripheral portion 16 in the direction of the axis O from the outer peripheral portion 16. The cross section of the concave portion 17 in the direction perpendicular to the axis is formed in an arc shape. The amount of depression D from the surface of the outer peripheral portion 16 to the surface of the concave portion 17 is set to be larger than the thickness T of the outer peripheral portion 16. Preferably, it is set to D=T+α (however, α is taken into consideration The thickness of the peripheral portion 16 or the value of the deviation of the core offset or the like). The fragile portion 20 has a slit 21 formed in the outer peripheral portion 16, and a connecting portion 22 is formed in the recess portion 17.

The fragile portion 20 is formed by cutting the molded body 210 (see (c) in FIG. 3) along the cutting line B. Specifically, the slit 21 is formed by cutting a slit from the radially outer side of the molded body 210 in the circumferential direction by using a cutter (not shown). The slit 21 and the connecting portion 22 penetrating the outer peripheral portion 16 are formed by setting the slit depth C of the cutter on the outer circumference of the molded body 210 to T < C < D. As a result, the fragile portion 20 of the sewing machine pinhole shape in which the slit 21 is continuously formed in the circumferential direction is formed.

The combination device 30 for manufacturing the dust cover 1 will be described with reference to Figs. 5 and 6 . 5 is an axial cross-sectional view of the combination device 30 of the dust cover 1, and FIG. 6 is a cross-sectional view of the combination device 30 taken along line VI-VI of FIG. 5. Further, in FIG. 5, a part of the longitudinal direction of the cylinders 32, 46 is omitted.

As shown in FIG. 5, the combination device 30 is a device for manufacturing the dust cover 1 in which the spring rubber seat 100 (annular member) is coupled to the main body tubular portion 2, and includes a flat plate portion 31 and a cylinder block 32 that support the whole. a device 33, a support rod 33 (piston rod) and a head portion 34, the top end of which is upwardly exposed from the table portion 31 and fixed to the table portion 31; the support post 33 is mounted on a piston built in the cylinder block 32 ( Not shown); the head 34 is disposed at the top end of the pillar 33. In the present embodiment, the cylinder 32 is a cylinder that operates by air pressure.

The combination device 30 includes a wall portion 41 that is provided on the table portion 31 so as to surround the pillars 33. The tip end face 42 of the wall portion 41 is set at a position lower than the head portion 34. The table portion 31 is provided with a pair of side plates 43 standing on both sides of the wall portion 41. The side plate 43 is an elongated member extending in parallel with the stay 33, and is provided with an intermediate plate 44 at a position slightly lower than the top end face 42 of the wall portion 41, and a top plate 45 is provided at the upper end. top The plate 45 is a member for fixing the cylinder 46 (driving device) that exposes the tip from the top plate 45 downward. In the present embodiment, the cylinder 46 is a cylinder that operates by air pressure. The cylinder block 46 is provided with a piston rod 47 mounted on a built-in piston (not shown). The piston rod 47 is disposed in parallel with the axis of the strut 33 and the head portion 34.

The support member 48 is an annular member attached to the tip end of the piston rod 47, and has a circular hole portion 49 penetrating in the axial direction at the center thereof. The support member 48 is attached with a spring 50 (coil spring) at three places in the circumferential direction of the axial end surface (lower surface), and an abutting member 51 is attached to the lower end of the spring 50. The contact member 51 is an annular member that is disposed coaxially with the support member 48, and has a circular hole portion 52 penetrating in the axial direction at the center thereof. The abutting member 51 abuts against the spring rubber seat 100 (refer to FIG. 1) for the member pressed in the axial direction, and the inclined surface of the flange portion 102 corresponding to the spring rubber seat 100 is formed on the end surface (lower end surface). surface. The support member 48 and the contact member 51 are disposed coaxially with the pillar 33 and the head portion 34.

The pillar 33 is provided with a limiting device 60 in the vicinity of the head portion 34 on the distal end side and on the inner side of the wall portion 41. The stopper device 60 is attached to the table portion 31 via a support (not shown) disposed along the stay 33.

As shown in Fig. 6, the support post 33 is a metal shaft member for setting the head portion 34 to a predetermined height, and the length of the initial position is set to be the length in the axial direction of the main body tubular portion 2 (see Fig. 2) (free Long) is roughly the same. Further, the size (thickness) of the cross section perpendicular to the axial direction of the stay 33 is set to be smaller than the inner diameter of the main body tubular portion 2.

The head portion 34 is attached to the distal end of the stay 33 for supporting the portion of the pocket portion 11 of the bag-like body 10 (refer to FIG. 2). In the present embodiment, the head portion 34 is the abutting surface 35 which is the side surface of the upper narrow truncated cone, and the lower surface of the abutting surface 35 The side of the lower narrow truncated cone whose end edges intersect, that is, the synthetic resin member surrounded by the conical surface 36. The angle of the abutting surface 35 on the abutting surface 35 of the section including the axis O and the axis O is set to be the same as the angle of the tip end portion 13 of the bag-like body 10 with respect to the axis O. Further, the outer diameter of the head portion 34 (the diameter of the lower end edge of the abutting surface 35) is set to be smaller than the diameter of the rib that the base portion 12 of the pocket portion 11 intersects with the tip end portion 13.

When viewed in the axial direction, the head portion 34 forms a circular insertion hole 37 (engagement portion) at the center of the abutting surface 35, and a recess 38 is formed at the center of the conical surface 36. A bolt 39 is inserted into the hole penetrating the insertion hole 37 and the bottom of the recess 38. The bolt 39 is a member provided with a spring 40 (coil spring) attached to the tip end of the strut 33. The head 34 is connected to the strut 33 by a spring 40.

The wall portion 41 is a metal member for positioning the spring rubber seat 100 in the axial direction with respect to the bag body 10 (refer to FIG. 2). The wall portion 41 is formed in a cylindrical shape coaxial with the support post 33 and the head portion 34, and has an inner diameter that is set to be slightly larger than the outer diameter of the main body tubular portion 2 of the pouch body 10. When the dust cover 1 is manufactured, the wall portion 41 forms the distal end surface 42 where the main body portion 101 of the spring rubber seat 100 abuts on the axial end surface.

The stopper device 60 is a device including the drive unit 61 and the opening/closing member 62 (driven joint) that is driven by the drive unit 61, and is used to limit the insertion end portion 4 (see FIG. 1) when the dust cover 1 is manufactured. s installation. The opening and closing member 62 is a metal member that is guided by a guide (not shown) supported by a main body 65 (described later), and is opened and closed in a radial direction perpendicular to the direction of the axis O. In the present embodiment, three components are provided. Arranged in the circumferential direction around the pillars 33. Viewed in the axial direction, each member was formed into a fan shape having a central angle of 120°. An outer end portion 63 having an arc-shaped outer shape of the opening and closing member 62 is formed to protrude outward in the radial direction to the upper end portion. A slope 64 that expands in diameter as it goes downward is formed on the inner peripheral surface of the lower end portion.

The drive unit 61 is a device for opening and closing the opening and closing member 62 in the radial direction, and has a bottomed cylindrical main body 65 that penetrates the support 33 at the center, a piston 66 that is disposed inside the main body 65, and a piston 66 that is attached to the piston 66 toward the opening and closing member 62. Extended cam 67. The drive unit 61 supplies air from the gas line (not shown) to the two air chambers formed by the main body 65 and the piston 66, and reciprocates the piston 66 and the cam 67 in the axial direction. As the cam 67 moves in the axial direction, the opening and closing member 62 moves in the radial direction.

The spring 40 is set to a free length so as to have a predetermined gap between the upper end surface 62a of the opening and closing member 62 and the lower surface of the head portion 34 (the lower edge of the conical surface 36). Thereby, the head portion 34 is swingably connected to the stay 33 by the spring 40 in the gap range. Further, the spring 40 can be contracted and lowered until the head portion 34 comes into contact with the opening and closing member 62. When the head portion 34 is in contact with the opening and closing member 62 (upper end surface 62a), the position (height) of the distal end surface 42 of the wall portion 41 is set to the head portion 34 that is abutted from the pocket portion 11 (see FIG. 2). The axial length of the abutting surface 35 to the distal end surface 42 is the same as the axial length from the inner surface of the distal end portion 13 of the pocket portion 11 to the projecting portion 5.

A combination method of the dust cover 1 using the combination device 30 will be described with reference to Figs. 7 to 12 . 7 is a cross-sectional view of the assembly device 30 inserted into the pouch body 10, FIG. 8 is a cross-sectional view of the assembly device 30 in which the pouch body 10 is inserted into the spring rubber seat 100, and FIG. 9 is a side view of the pouch body 10, 10 is a cross-sectional view of the combination device 30 in which a part of the fragile portion 20 is broken, FIG. 11 is a cross-sectional view of the combination device 30 after the entire periphery of the fragile portion 20 is broken, and FIG. 12 is a combination device 30 after the fragile portion 20 is broken. Sectional view. In addition, in Figures 7 to 12 In the middle, a part (lower portion) of the pillar 33 and the wall portion 41 in the axial direction is omitted.

First, as shown in FIG. 7 , in the state of the initial position of the contraction stay 33 and the opening and closing member 62 is closed, the head portion 34 is covered with the bag body 10 , and the bag body 10 is inserted into the inside of the wall portion 41 . At this time, the convex portion 18 formed in the pocket portion 11 is inserted into the insertion hole 37 formed in the head portion 34. Next, the main body portion 101 of the spring rubber seat 100 is gently covered downward toward the vicinity of the base portion 12 of the bag-like body 10 (temporarily placed). Further, the direction in which the spring rubber seat 100 is covered (the oblique direction of the flange portion 102) is substantially aligned with the inclination of the end surface (lower end surface) of the abutting member 51.

Next, as shown in FIGS. 8 and 9, the cylinder 46 (see FIG. 5) is operated to extend the piston rod 47, and the support member 48 is moved toward the head 34 side. After the end surface of the contact member 51 is brought into contact with the end surface of the main body portion 101 of the spring rubber seat 100, the piston rod 47 is further extended, and the pocket portion 11 is inserted into the main body portion 101 of the spring rubber seat 100. Since the bag portion 11 is supported to a predetermined height by the stay 33 and the head portion 34, even if the bag body 10 is easily deformed, rigidity is ensured by the head portion 34, and the bag portion 11 can be inserted into the main body portion 101 of the spring rubber seat 100. As a result, the operation load can be reduced as compared with the case where the bag-shaped body 10 (bag portion 11) is inserted into the spring rubber seat 100 without using the combination device 30.

The base portion 12 is formed with a conical outer peripheral portion 16 that is inclined less than the distal end portion 13 with respect to the axis O. Thereby, when the outer peripheral portion 16 enters the axial direction of the main body portion 101, the protruding portion 103 of the spring rubber seat 100 is gradually elastically deformed outward in the radial direction. The base portion 12 includes a contact surface portion 15 that is connected to the outer peripheral portion 16, and the contact surface portion 15 has an outer diameter that can come into contact with the inner peripheral surface of the main body portion 101. Since the groove portion 14 is recessed between the contact surface portion 15 and the protruding portion 5, if it is in a bag shape When the projecting portion 5 of the body 10 is pressed against the main body portion 101, the protruding portion 103 of the elastically deformed spring rubber seat 100 is restored to the original in the radial direction and engaged with the groove portion 14, thereby restraining the spring rubber seat 100 from being in the shaft. Move up. Further, when the contact surface portion 15 enters the main body portion 101, the movement of the bag-like body 10 in the radial direction is restricted. Thereby, the bag body 10 is fixed to the spring rubber seat 100.

Since the contact member 51 is connected to the support member 48 by a plurality of (three in the present embodiment) springs 50, when the main body portion 101 is pressed into the bag portion 11, the corresponding main body portion 101 is opposed to the pocket portion 11. Tilt, the abutment member 51 swings relative to the support member 48. As a result, the body portion 101 is pressed into the pocket portion 11 while the inclination of the bag portion 11 is divided (corrected). Thereby, the main body portion 101 can be reliably fitted into the pocket portion 11.

On the other hand, when the contact member 51 is not swung by the spring 50 (when the spring 50 is omitted), the bag portion 11 may be fitted in a state where the main body portion 101 is inclined, and the spring rubber seat 100 may be mounted poorly. Or a part of the projecting portion 5 (the portion having weak strength) is recessed. Such a depression can be prevented according to the present embodiment.

Since the abutting member 51 is swung relative to the supporting member 48 by the spring 50, even if the spring rubber seat 100 is arbitrarily temporarily placed on the bag body 10, the abutting member 51 corresponds to the inclination of the temporarily placed spring rubber seat 100. Come swing. Since the inclination of the bag portion 11 is automatically corrected, the main body portion 101 is press-fitted into the pocket portion 11, so that it is possible to prevent the installation failure or the extension from occurring irrespective of the operational accuracy of temporarily placing the spring rubber seat 100 on the bag body 10. The outlet 5 is recessed. Thereby, the reliability of the quality of the dust cover 1 can be improved.

Since the head 34 is swingably connected to the pillar 33 by the spring 40 Therefore, the inclination of the pocket portion 11 covering the head portion 34 can be automatically adjusted in accordance with the inclination of the main body portion 101 of the spring rubber seat 100. As a result, the inner circumference of the circular protruding portion 103 is brought into close contact with the outer circumference of the circular base portion 12, and the protruding portion 103 of the spring rubber seat 100 can be uniformly pressed into the position of the protruding portion 5. Thereby, it is possible to reliably prevent the occurrence of a defect in which the spring rubber seat 100 is poorly mounted or a part of the protruding portion 5 is recessed.

Since the outer diameter of the head portion 34 is set smaller than the inner diameter of the base portion 12, a gap is formed between the base portion 12 of the pocket portion 11 and the head portion 34. When the base portion 12 is inserted into the spring rubber seat 100, since the base portion 12 is elastically deformed by a corresponding amount of the gap only in the radial direction inner side, the axial tensile stress acting on the fragile portion 20 (the connecting portion 22) can be alleviated. Thereby, when the bag portion 11 is inserted into the spring rubber seat 100, the fragile portion 20 can be prevented from being broken.

Since the distal end portion 13 of the pocket portion 11 is formed in a substantially conical shape, the rigidity of the distal end portion 13 of the pocket portion 11 can be improved, and the formation of the pocket can be reduced, compared to the case where the distal end portion 13 is formed into a substantially cylindrical shape with a bottom portion. The volume of the material of the portion 11 (in the present embodiment, a plastic resin). As a result, the bag portion 11 can be easily inserted into the spring rubber seat 100, and the material of the bag portion 11 that constitutes the separation when the dust cover 1 is formed can be reduced. Further, since the pocket portion 11 (the base portion 12 and the distal end portion 13) is formed in a narrow front shape which is tapered as it goes from the main body tubular portion 2 toward the axial end portion, the spring rubber seat 100 can be easily covered with the pocket portion 11.

The spring 40 is pressed against the pocket portion 11 and gradually contracted corresponding to the press-fitting of the spring rubber seat 100, and the final head portion 34 is pressed into the opening and closing member 62. In this state, the position (height) of the distal end surface 42 of the wall portion 41 is set to a length in the axial direction from the abutting surface 35 of the head portion 34 abutting from the pocket portion 11 to the distal end surface 42. The length from the inner surface of the pocket portion 11 (tip surface 13) abutting from the abutting surface 35 to the projecting portion 5 is the same in the axial direction. Thereby, when the pocket portion 11 is inserted into the spring rubber seat 100, the end surface of the main body portion 101 in the axial direction comes into contact with the distal end surface 42 of the wall portion 41. Since the projecting portion 5 is provided at the contact position, the spring rubber seat 100 can be accurately mounted at the position of the projecting portion 5. Further, the spring rubber seat 100 can be violently lowered until the distal end surface 42 of the wall portion 41 comes into contact with the end surface in the axial direction of the main body portion 101, so that the operation time of the spring rubber seat 100 to be attached to the pocket portion 11 can be shortened.

On the other hand, when the wall portion 41 is not provided, a part (the portion having a small strength) of the main body tubular portion 2 may enter the main body portion 101 of the spring rubber seat 100 beyond the extension portion 5. In order to prevent this, it is necessary to control the amount of elongation of the piston rod 47 or the like. According to the present embodiment, these problems can be solved by the wall portion 41, and the spring rubber seat 100 can be accurately attached to the position of the extension portion 5 in a short time.

Since the wall portion 41 is provided, the end surface of the main body portion 101 of the spring rubber seat 100 can be pressed to the distal end surface 42 of the wall portion 41 by the abutting member 51. Since the main body portion 101 of the spring rubber seat 100 can be sandwiched between the distal end surface 42 of the wall portion 41 and the abutting member 51, the spring rubber seat 100 can be restrained while the spring rubber seat 100 is attached to the pouch body 10. Movement in the axial direction.

Next, as shown in FIG. 10, the stopper device 60 is operated to move the piston 66 and the cam 67 toward the head 34 side, and the opening and closing member 62 is opened to the outside in the radial direction, and a part of the base portion 12 (located above the groove portion 14 and located at the fragile portion) The portion below the bottom portion 20 is pressed from the inner surface side through the outer end portion 63. Since a part of the base portion 12 is sandwiched between the main body portion 101 and the outer end portion 63 of the spring rubber seat 100, the main body tubular portion 2 cannot be moved in the axial direction.

Next, the cylinder 32 is operated, and the strut 33 is extended to raise the head 34 toward the top plate 45 side. Since the head portion 34 presses the inner surface of the discarding portion 11a (a portion of the pocket portion 11) from the fragile portion 20 of the pocket portion 11, the axial tensile stress for breaking the fragile portion 20 acts on the joint portion. twenty two. Since the bag-like body 10 on the lower side of the fragile portion 20 is pressed by the outer end portion 63 of the opening and closing member 62, the protruding portion 5 is prevented from entering the main body portion 101 beyond the protruding portion 103, and the fragile portion 20 can be broken. Thereby, it is possible to prevent the spring rubber seat 100 from being mounted poorly or the projecting portion 5 from being recessed.

The fragile portion 20 does not break at the same time as a whole, but after a part of the fracture, the whole fracture is started with the fracture as a starting point. Thereby, the discarding portion 11a is pushed up by the head portion 34 while being inclined with respect to the axis O from the time when the weak portion 20 is partially broken and the entire portion is broken. Since the head portion 34 is attached to the stay 33 by the spring 40, if the head portion 34 is separated from the opening and closing member 62 in the axial direction, the tilting of the discarding portion 11a is performed. Since the head portion 34 follows the inclination of the discarded portion 11a in association with the breakage of the fragile portion 20, the fragile portion 20 can be smoothly broken.

When a part of the fragile portion 20 is broken and the entire portion is broken, the inclination of the discarded portion 11a is increased, and when a part of the fragile portion 20 is kept connected, the discarded portion 11a is separated from the head portion 34 (moving in the vertical direction of the shaft) Then, no force is applied to the reject portion 11a through the head portion 34. In this case, there is a problem that the entire fragile portion 20 cannot be broken.

On the other hand, according to the present embodiment, the convex portion 18 (burr) that protrudes toward the inner surface side is formed at the center, and the insertion hole 37 that receives the convex portion 18 is formed at the top of the head portion 34. Thereby, the fragile portion 20 can be broken In the period in which the insertion hole 37 is engaged with the convex portion 18, it is possible to prevent the discarded portion 11a from being detached from the head portion 34 while a part of the fragile portion 20 is kept connected.

As a result, as shown in FIG. 11, the force can be continuously applied to the reject portion 11a by the head portion 34 until the entire fragile portion 20 is broken. Thereby, it is possible to prevent the occurrence of the fracture defect remaining in a state in which a part of the fragile portion 20 is kept connected, and it is possible to reliably break the entire fragile portion 20 . Further, since the convex portion 18 is formed by the blow needle 206 (see (b) in FIG. 3) while being molded with the bag-like body 10, it is not necessary to form an additional operation of the convex portion 18 (the engaged portion).

Since the contact member 51 is formed with the hole portion 52 penetrating in the axial direction, it is possible to prevent the support member 51 and the head portion 34 from rising due to the contact member 51. Thereby, the fragile portion 20 can be broken by the rise of the stay 33 and the head portion 34.

As shown in Fig. 12, after the entire fragile portion 20 is broken, the cylinder 32 is operated to contract the column 33, and the head portion 34 is lowered to the initial position. Further, the cylinder 46 is operated to contract the piston rod 47, and the support member 48 and the contact member 51 are raised to the initial position. Similarly, the drive unit 61 of the stopper device 60 is operated to lower the piston 66 and the cam 67, and the opening and closing member 62 is closed and returned to the initial position.

When the retracting portion 11a is taken out and the main body tubular portion 2 in the wall portion 41 is pulled up by the spring rubber seat 100, the opening of the insertion end portion 4 (see Fig. 1) can be obtained by being combined with the spring rubber seat 100. Cover 1. The taken-out portion 11a can be reused as a molding material of the other bag-like body 10.

The head portion 34 is formed with a conical surface 36 that is reduced in diameter toward the side of the stopper device 60. Thereby, when the head portion 34 is lowered to the initial position, the edge of the cut-away portion 11a (a part of the fragile portion 20) can be prevented from being caught between the head portion 34 and the opening. It cannot be taken out between the closed members 62. Thereby, the operability of the operation of taking out the discarded portion 11a and the dust cover 1 from the combination device 30 can be improved.

Here, the fragile portion 20 of the bag-like body 10 is not formed into a needle hole shape of the sewing machine, and is subjected to processing such as scratching or fine continuous slit (non-penetrating hole portion) or the bag portion 11 formed to be separated from each other. The side is welded to the side of the main body tubular portion 2 so that it can be easily broken from the position where the processing is performed or the position where the welding is performed.

However, in the case of performing a process such as scratching or fine continuous slit (non-penetrating hole portion), since the thickness of the outer peripheral portion 16 is small, high processing accuracy is required. Further, due to the thickness of the outer peripheral portion 16 or the variation in processing, the breaking weight of the formed fragile portion 20 is likely to vary. As a result, when the bag-like body 10 is inserted into the main body portion 101 of the spring rubber seat 100, the possibility that the fragile portion is accidentally broken is increased before the bag-like body 10 is fixed at a predetermined position. Further, in the case where the side of the bag portion 11 formed by separation is welded to the side of the main body tube portion 2, the amount of welding operation is required, and the variation in the breaking weight of the welded portion is likely to occur.

On the other hand, in the present embodiment, when the concave portion 17 is provided in the outer peripheral portion 16 (see FIG. 4) and the slit 21 and the connecting portion 22 are formed by adjusting the depth of cut of the cutter (not shown), the concave portion 17 is set. The amount of depression, the circumferential length, the curvature, and the like can easily ensure the effective area of the connecting portion 22. As a result, it is possible to suppress the variation in the breaking weight of the fragile portion 20 due to the thickness of the outer peripheral portion 16 or the machining variation. Further, since the fragile portion 20 can be formed in the final processing step (see FIG. 3(c)), the operation load can be reduced.

The circumferential length of the connecting portion 22 is set to be smaller than the circumferential length of the slit 21. Thereby, the circumferential length of the slit 21 is set smaller than the joint portion. In the case of the circumferential length of 22, the fragile portion 20 can be broken with a small force.

Since the bag-shaped body 10 opens the insertion end portion 4 by removing the pocket portion 11, the piston rod 112 of the damper 110 can be inserted. Further, since the fragile portion 20 can be broken without using a cutter, the insertion end portion 4 can be opened, so that damage to the spring rubber seat 100 and hand injury can be prevented. Further, since the tool is not used, the operator does not need to pick up and lower the tool. Therefore, the production interval of the operation can be shortened.

Next, a second embodiment will be described with reference to Figs. 13 and 14 . In the first embodiment, the case where the convex portion 18 is protruded from the bag body 10 and the insertion hole 37 (recessed portion) is formed in the head portion 34 has been described. In the first embodiment, when the reject portion 11a is pushed up by the head portion 34, the convex portion 18 is engaged with the insertion hole 37, and the discarding portion 11a can be prevented from being laterally separated from the traveling direction of the head portion 34. On the other hand, in the second embodiment, a case where the hole portion 71 is formed in the bag body 70 and the bolt 82 (protrusion portion) is protruded from the head portion 81 will be described. In the same portions as those described in the first embodiment, the same reference numerals are used to omit the following description. FIG. 13 is a perspective view of the bag body 70 processed by the combination device 80 of the second embodiment, and FIG. 14 is an axial cross-sectional view of the combination device 80.

As shown in FIG. 13, the bag-like body 70 forms a hole portion 71 (engaged portion) that is circular in the axial direction at the top of the bag portion 11. After the pocket portion 70 is molded, the hole portion 71 is formed by cutting a tip end portion of the pocket portion 11 with a cutter (not shown).

As shown in FIG. 14, the combining device 80 has a head portion of a bolt 82 (engagement portion) projecting from the top of the head portion 81 covering the bag body 70. Bolt 82 The outer diameter of the head is set to be smaller than the inner diameter of the hole portion 71 formed in the pocket 70.

In order to manufacture the dust cover 1, when the bag body 70 covers the head portion 81, the head of the bolt 82 is inserted into the hole portion 71. With this configuration, the bolt 82 can be engaged with the hole 71 while the fragile portion 20 is being broken. Therefore, the discarding portion 11a (see FIG. 10) can be prevented from being detached from the head portion 81 while the portion of the fragile portion 20 is kept connected. As a result, during the breakage of the entire fragile portion 20, the force can be continuously applied to the reject portion 11a by the head portion 81. Therefore, it is possible to prevent the occurrence of the fracture defect remaining in a state where a part of the fragile portion 20 is kept connected.

The present invention has been described above with reference to the embodiments. However, it is to be understood that the invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit and scope of the invention. For example, the circumferential length or axial width, shape, number, and the like of the slit 21 or the connecting portion 22 can be appropriately set.

In the above-described embodiment, the case where the bag-like body 10 which is the blank of the dust cover 1 is integrally molded by blow molding has been described. However, the present invention is not limited thereto, and the bag body 10 may be manufactured by another molding method. . As another molding method, for example, injection molding is mentioned.

When the bag-shaped body 10 is manufactured by blow molding, after the hollow molded body 210 (see FIG. 3(c)) is molded, the opening end portion 3 and the fragile portion 20 are formed by cutting with a cutter. On the other hand, when the bag-shaped body 10 is manufactured by injection molding, since it is not necessary to pass through the hollow molded body 210, it is not necessary to form the opening end portion 3 and the fragile portion 20 by cutting with a cutter. Since the outer shape of the bag body 10 is determined by the shape of the inner surface of the cavity of the injection molding die in the case of injection molding, it is appropriate to apply the injection molding die. It is designed to manufacture the bag-like body 10 in which the open end portion 3 or the fragile portion 20 is integrally formed.

When the bag-like body 10 is manufactured by injection molding, the thickness of the bag-shaped body 10 can be set relatively easily. For this reason, by appropriately designing the injection molding die, instead of forming the fragile portion 20 (the slit 21 and the connecting portion 22) by cutting, the thickness can be controlled by integral molding, and a fine continuous slit of the fragile portion 20 can be obtained. (non-penetrating hole portions), through holes, embossing, portions having a small thickness, slits, and the like are set. Thereby, it is of course possible to break the fragile portion 20.

In the above embodiment, the case where the dust cover 1 is inserted into the spring rubber seat 100 has been described as an example of the annular member. However, the annular member is not limited to the spring rubber seat 100, and the member in which the axial end portion of the dust cover 1 is inserted may be another annular member (tubular member). Other annular members are exemplified by, for example, a fixture. In addition, the annular member is not limited to the rubber-like elastic body. Of course, a tubular member made of metal or synthetic resin constituting a part of the fixing device may be an annular member.

In the above embodiment, the protruding portion 103 (see FIG. 1) is protruded from the spring rubber seat 100, and the groove portion 14 that engages with the protruding portion 103 is formed on the dust cover 1 that is inserted into the spring rubber seat 100. The case has been described, but it is not limited thereto. Of course, the protruding portion 103 or the groove portion 14 can be omitted, and the insertion end portion 4 of the dust cover 1 can be held by the elastic support of the spring rubber seat 100.

In each of the above embodiments, the support member 48 and the contact member 51 are connected to the support member 33 and the head portions 34 and 81 via the spring 40, whereby the head portions 34 and 81 and the contact member 51 are both provided. The case where it can swing is explained. However, it is not necessarily limited to this, and it is of course possible to carry out the support 33 by a spring. The connection to the heads 34, 81 or the connection of the support member 48 and the abutment member 51.

When one of the two is connected by a spring, it is preferable that the support member 48 and the contact member 51 are connected by the spring 50, and the contact member 51 can be swung. Since the diameter of the abutting member 51 is larger than the diameter of the head portions 34, 81, the method of swinging the abutting member 51 can increase the swing angle with respect to the axis O. Thereby, when the pocket portion 11 is press-fitted into the spring rubber seat 100, the adjustment margin of the inclination of the spring rubber seat 100 with respect to the pocket portion 11 can be increased.

In each of the above embodiments, the case where the springs 40 and 50 (coil springs) are connected between the support post 33 and the head portions 34 and 81, and between the support member 48 and the contact member 51 has been described. However, it is not necessarily limited to this, and an elastic body such as a high elastic material may be used instead of the spring (coil spring).

In each of the above-described embodiments, the case where the contact member 51 is formed of a member having a circular cross section (cylindrical member) has been described. However, the contact member 51 is not necessarily limited thereto, and may have an end face that can be coupled to the spring rubber seat 100. The abutting surface can be abutted. As another contact member, a member having a C-shaped cross section, a member in which a plurality of pins are protruded in the axial direction, and pin end faces are arranged in a circumferential shape are exemplified.

Although the description has been omitted in the above embodiments, the hole portion 49 may not be provided on the support member 48 when the contact member 51 or the spring 50 at the time of compression is sufficiently long in the axial direction. By making the length of the abutting member 51 or the spring 50 at the time of compression in the axial direction sufficiently long, even if the hole portion 49 is not provided in the support member 48, it is possible to prevent the strut 33 and the head 34 from being obstructed when the fragile portion 20 is broken. rise.

In the above embodiment, the pair of wall portions 41 are formed of cylindrical members. Although the case has been described, the present invention is not limited thereto, and it is of course possible to surround the pillars 33 and the like by arranging a plurality of pile-like members. The wall portion 41 only needs to restrict the movement in the vertical direction of the main body tubular portion 2 inserted into the inner side, and the position of the spring rubber seat 100 in the axial direction can be restricted by the distal end surface 42.

In the above embodiment, the case where the extension portion 5 protrudes in a flange shape over the entire circumference of the main body tubular portion 2 has been described. However, it is not necessarily limited to this. It is needless to say that the projecting portion 5 may be provided intermittently at intervals in the circumferential direction of the main body tubular portion 2.

Claims (4)

A combination device of a dust cover having an outer circumference of a piston rod that is disposed to surround a damper of a vehicle, and a cylindrical body barrel portion coupled to an annular member mounted on a vehicle body side, the combination device The main body tubular portion includes a pocket portion connected to an axial end portion, wherein the pocket portion forms a fragile portion that is more likely to be broken than the main body tubular portion in a circumferential direction; the assembly device has a pillar, a head, an abutting member, a supporting member, an elastic member, a driving device, and a limiting device; the post is inserted into a pocket connected to the pocket portion of the axial end portion of the main body barrel; the head a portion disposed at a top end of the pillar and covered by the pocket portion; the abutting member being disposed to be offset from an axial end surface of the annular member into which the pocket portion covering the head portion is inserted The driving device moves the abutting member relative to the strut in the axial direction; the retaining device pair is inserted into and fixed to the fragile portion of the pocket portion of the annular member and Interpolating end between the body barrels And the driving device abuts the abutting member abutting the annular member and the state in a state where the interpolation end portion is restricted to the annular member by the limiting device The struts are relatively moved in the axial direction to break the fragile portion. The combination device according to claim 1, wherein the stopper device includes a plurality of opening and closing members that are disposed around the pillar and open and close in a radial direction; The opening and closing member includes an outer end portion that is in contact with the insertion end portion when opened, and is separated from the insertion end portion when closed. The combination device according to claim 1 or 2, wherein the bag portion includes an engaged portion formed on an axial side of the fragile portion; and the head portion is provided When the fragile portion is broken, the engaging portion that engages with the engaged portion is engaged. A method of assembling a dust cover having an outer circumference of a piston rod that is disposed to surround a damper of a vehicle, and a cylindrical body barrel portion coupled to an annular member mounted on a vehicle body side, the combination method The present invention includes a preparation step, a covering step, a fixing step, a stopper step, and a removing step. In the preparing step, a bag-shaped body is prepared, and the bag-like body is formed in the circumferential direction in comparison with the main body tube portion. a pocket portion of the fragile portion that is easily broken, and is connected to an axial end portion of the body barrel portion; in the covering step, the pocket portion of the pocket body covers a head portion provided at a tip end of the pillar; In the fixing step, the bag portion is inserted into the annular member, and the interposed end portion between the fragile portion and the main body tubular portion is fixed to the annular member; in the limiting process Restricting the interposed end portion fixed to the annular member; and in the removing step, limiting the interpolating end portion to the annular member In the state in which the annular member and the strut are relatively moved in the axial direction, the fragile portion is broken, and is retained and fixed to the end portion of the annular member, and the axial end portion side is removed.