CN116848338A

CN116848338A - Bracket fixing member, damper, and method for manufacturing damper

Info

Publication number: CN116848338A
Application number: CN202280012920.8A
Authority: CN
Inventors: 黑田豊
Original assignee: Hitachi Astemo Ltd
Current assignee: Hitachi Astemo Ltd
Priority date: 2021-02-02
Filing date: 2022-01-31
Publication date: 2023-10-03
Also published as: JP7504237B2; WO2022168779A1; JPWO2022168779A1

Abstract

The damper comprises a cylindrical or arc-shaped base member (15), a plurality of fixing portions (121) provided in the circumferential direction of the base member (15), and a bracket (16). The fixing portion (121) is disposed so as to overlap with the outer peripheral side of the base member (15). The fixing portion (121) is fixed to the base member (15) by resistance welding. The bracket (16) is provided with an arc-shaped part (91). The arc-shaped portion (91) is formed such that the curvature of the circumferential outer portion (102) is at least wider in the outer diameter direction than the curvature between the plurality of fixing portions (121).

Description

Bracket fixing member, damper, and method for manufacturing damper

Technical Field

The present application relates to a bracket fixing member, a damper, and a method for manufacturing the damper.

The present application claims priority based on 2021, 2 and 2 in japanese patent application publication No. 2021-014842, the contents of which are incorporated herein by reference.

Background

There are bumpers to which brackets are attached (see patent documents 1 and 2, for example).

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2001-182772

Patent document 2: japanese patent application laid-open No. 2002-283993

Disclosure of Invention

Problems to be solved by the application

There are cases where the bracket is mounted to the base member by resistance welding. In such a mounting structure, it is desirable to suppress degradation of the welding quality.

The invention provides a bracket fixing member, a damper and a method for manufacturing the damper, wherein the reduction of welding quality can be restrained.

Means for solving the problems

According to a first aspect of the present invention, a bracket fixing member includes: a cylindrical or arc-shaped base member; and a bracket having a plurality of fixing portions provided in a circumferential direction of the base member, the fixing portions being arranged so as to overlap an outer circumferential side of the base member and being fixed to the base member by resistance welding, the bracket including an arcuate portion formed such that a curvature of an outer portion in the circumferential direction is expanded in an outer radial direction at least more than a curvature between the plurality of fixing portions.

According to a second aspect of the present invention, a damper includes a cylindrical cylinder. The damper has a first bracket and a second bracket, wherein the first bracket is formed by molding a plate material so as to cover at least a part of the outer peripheral side of the cylinder, and is fixed to the cylinder. The second bracket has: a holding portion that holds other members; a plurality of fixing portions provided in a circumferential direction of the base member, the fixing portions being arranged so as to overlap an outer circumferential side of the base member and being fixed to the base member by resistance welding; the second bracket includes an arcuate portion formed such that a curvature of a circumferential outer portion extends in an outer radial direction at least more than a curvature between the plurality of fixing portions.

According to a third aspect of the present invention, a method for manufacturing a damper including a cylindrical cylinder includes: a step of preparing a first bracket and a second bracket, wherein at least a part of the first bracket is formed in an arc shape, and the second bracket comprises: a plurality of protruding portions, at least a part of which is a first arc-shaped portion formed in an arc shape, protruding toward an inner peripheral side of the first arc-shaped portion; a second arcuate portion located outside the first arcuate portion in the circumferential direction and formed to expand in the outer radial direction than the first arcuate portion; a step of fixing the first bracket to the cylinder; a step of disposing the second bracket so that the protruding portion is brought into contact with an outer periphery of a base member constituted by the cylinder or the first bracket; and a step of performing resistance welding by energizing a current between the base member and the protruding portion.

Effects of the invention

According to the damper and the method for manufacturing the damper, a reduction in welding quality can be suppressed.

Drawings

Fig. 1 is a cross-sectional view showing a damper according to a first embodiment of the present invention.

Fig. 2 is a side view showing a main portion of a damper according to a first embodiment of the present invention.

Fig. 3 is a cross-sectional view of fig. 2 showing a main part of a damper according to a first embodiment of the present invention.

Fig. 4 is a cross-sectional view showing a main portion of the damper according to the first embodiment of the present invention after the second bracket disposing step and before the second bracket welding step.

Fig. 5 is a cross-sectional view showing a main part of a damper according to a second embodiment of the present invention.

Fig. 6 is a cross-sectional view showing a main part of a damper according to a third embodiment of the present invention.

Fig. 7 is a cross-sectional view showing a main part of a modified example of the damper according to the first embodiment of the present invention.

Detailed Description

First embodiment

A first embodiment of the present invention will be described below with reference to fig. 1 to 4.

Fig. 1 shows a damper 11 (bracket fixing member) according to a first embodiment. The shock absorber 11 is used for a suspension device of a vehicle such as an automobile or a railway vehicle. Specifically, the present invention relates to a damper for a strut-type suspension of an automobile. The damper 11 includes a cylindrical inner tube 12, a bottomed cylindrical outer tube 14, a first bracket 15 (base member), and a second bracket 16 (bracket) attached to the outer peripheral side of the first bracket 15 by welding as shown in fig. 2. The outer barrel 14 has a diameter greater than the diameter of the inner barrel 12. The outer tube 14 is provided on the outer peripheral side of the inner tube 12, and a reservoir chamber 13 is formed between the outer tube 4 and the inner tube 12. The first bracket 15 is attached to the outer peripheral side of the outer tube 14 by welding. The inner tube 12 and the outer tube 14 shown in fig. 1 constitute a cylindrical cylinder 17.

The outer tube 14 is an integrally molded product made of one metal member. The outer tube 14 has a cylindrical side wall 21, a bottom 22 closing one end side in the axial direction of the side wall 21, and an opening 23 on the side of the side wall 21 opposite to the bottom 22.

The damper 11 includes an annular body member 30 attached to one axial end of the inner tube 12, and an annular rod guide 31 attached to the other axial end of the inner tube 12. The inner tube 12 is fitted to the bottom 22 of the outer tube 14 via the main body member 30. The inner tube 12 is fitted to the side wall portion 21 of the outer tube 14 via the rod guide 31 on the opening 23 side. In this state, the inner tube 12 is positioned in the radial direction as well as the axial direction with respect to the outer tube 14.

The damper 11 has an annular sealing member 33 on the opposite side of the rod guide 31 from the bottom 22. The seal member 33 is fitted to the inner peripheral portion of the side wall portion 21 on the opening 23 side. The side wall portion 21 has a locking portion 34 formed at an end opposite to the bottom portion 22. The locking portion 34 is formed by plastic deformation to the radially inner side by crimping. The seal member 33 is sandwiched between the locking portion 34 and the rod guide 31.

The damper 11 has a piston 35 slidably fitted in the inner tube 12. The piston 35 defines a first chamber 38 and a second chamber 39 within the inner barrel 12. The first chamber 38 is disposed between the piston 35 and the rod guide 31 within the inner barrel 12. The second chamber 39 is provided between the piston 35 and the main body member 30 in the inner tube 12. The second chamber 39 in the inner tube 12 is partitioned from the reservoir chamber 13 by the main body member 30. The first chamber 38 and the second chamber 39 in the inner tube 12 are filled with oil as a working fluid. The reservoir chamber 13 between the inner tube 12 and the outer tube 14 is filled with gas and oil as working fluids.

The damper 11 has a piston rod 41. One side of the piston rod 41 is coupled with the piston 35. The other side of the piston rod 41 extends from the outer tube 14 to the outside through the opening 23. The piston 35 is coupled to the piston rod 41 by a nut 43. The piston rod 41 passes through the rod guide 31 and the seal member 33, and extends outward from the inner tube 12 and the outer tube 14. The portion of the piston rod 41 extending outward from the outer tube 14 is coupled to the vehicle body side. The piston rod 41 is guided by the rod guide 31 to move integrally with the piston 35 in the axial direction with respect to the inner cylinder 12 and the outer cylinder 14. The seal member 33 seals between the outer tube 14 and the piston rod 51, and restricts leakage of the oil in the inner tube 12, the gas in the reservoir 13, and the oil to the outside.

The piston 35 has a passage 44 and a passage 45 formed therethrough in the axial direction. The passages 44, 45 can communicate the first chamber 38 with the second chamber 39. The damper 11 has an annular disk valve 46 on the opposite side of the piston 35 from the bottom 22 in the axial direction. The disc valve 46 can close the passage 44 by abutting against the piston 35. The damper 11 further includes an annular disk valve 47 on the bottom 22 side in the axial direction of the piston 35. The disc valve 47 can close the passage 45 by abutting against the piston 35.

The disk valve 46 is a foreshortened side damping valve. That is, when the piston rod 41 moves to the shortening side where the amount of the intake into the inner tube 12 and the outer tube 14 increases, the piston 35 moves in the direction to narrow the second chamber 39, and the pressure in the second chamber 39 is higher than the pressure in the first chamber 38 by a predetermined value or more, the disc valve 46 opens the passage 44. When the disc valve 46 opens the passage 44, a damping force is generated. At least one of the piston 35 and the disc valve 46 is formed with a fixed orifice, not shown, which communicates the first chamber 38 with the second chamber 39 via the passage 44 even in a state where the disc valve 46 closes the passage 44 to the maximum extent.

The disc valve 47 is an extension-side damping valve. That is, when the piston rod 41 moves to the extension side where the protruding amount from the inner tube 12 and the outer tube 14 increases, the piston 35 moves in the direction to narrow the first chamber 38, and the pressure in the first chamber 38 is higher than the pressure in the second chamber 39 by a predetermined value or more, the disc valve 47 opens the passage 45. When the disc valve 47 opens the passage 45, a damping force is generated. At least one of the piston 35 and the disc valve 47 is formed with a fixed orifice, not shown, which communicates the first chamber 38 with the second chamber 39 via the passage 45 even in a state where the disc valve 47 closes the passage 45 to the maximum extent.

The body member 30 is formed with a passage 52 and a passage 53 penetrating in the axial direction. The passages 52, 53 can communicate the second chamber 39 with the reservoir chamber 13. An annular disk valve 55 is provided on the bottom 22 side in the axial direction of the main body member 30. An annular disk valve 56 is provided on the opposite side of the body member 30 from the bottom 22 in the axial direction. The disc valve 55 can close the passage 52 by abutting against the body member 30. The disc valve 56 can close the passage 53 by abutting against the body member 30.

The disk valve 55 is a reduction-side damping valve. That is, when the piston rod 41 moves to the shortening side, the piston 35 moves in the direction to narrow the second chamber 39, and the pressure in the second chamber 39 is higher than the pressure in the reservoir chamber 13 by a predetermined value or more, the disc valve 55 opens the passage 52. When the disc valve 55 opens the passage 52, a damping force is generated. The disc valve 56 is a suction valve. That is, when the piston rod 41 moves toward the extension side, the piston 35 moves toward the first chamber 38 side, and the pressure in the second chamber 39 is lower than the pressure in the reservoir chamber 13, the passage 53 is opened. At this time, the disk valve 56 causes the working fluid to flow from the reservoir chamber 13 into the second chamber 39 substantially without generating damping force.

The first bracket 15 is made of metal. The first bracket 15 is fitted to the side wall portion 21 on the bottom portion 22 side of the central position in the axial direction of the outer tube 14, and is welded and fixed. As shown in fig. 2 and 3, the first bracket 15 includes: a fitting portion 60 which is fitted to the outer peripheral portion of the side wall portion 21 in a shape of constituting a part of a cylinder; a pair of substantially flat plate-shaped first extension portions 61 and second extension portions 62 extending in the same direction from the fitting portion 60 to the radially outer side of the fitting portion 60 substantially in parallel with each other. The fitting portion 60 of the first bracket 15, which is at least a part thereof, is formed in an arc shape. Two mounting holes 63 are formed in the first extension 61 and the second extension 62, respectively. The first bracket 15 is coupled to the wheel side by fasteners (not shown) inserted into the mounting holes 63.

On the fitting portion 60, a punched hole 65 penetrating the fitting portion 60 in the radial direction of the fitting portion 60 is formed on the opposite side of the pair of first extending portions 61 and second extending portions 62 in the circumferential direction thereof. As shown in fig. 1, the punched hole 65 is formed at an intermediate position in the axial direction of the fitting portion 60.

The fitting portion 60 is a first main fitting portion 71 having an arc shape at a portion opposite to the bottom 22 than the punched hole 65 in the axial direction of the cylinder 17. The first main fitting portion 71 continuously covers the outer circumferential surface 21a of the side wall portion 21 of the outer tube 14 by more than half of the circumference. The fitting portion 60 is a second main fitting portion 72 having an arc shape at a portion of the bottom 22 in the axial direction of the cylinder 17, which is closer to the bottom than the punched hole 65. The second main fitting portion 72 continuously covers the outer peripheral surface 21a of the side wall portion 21 of the outer tube 14 by more than half of the circumference.

Further, the fitting portion 60 includes a pair of arcuate first and second clamping portions 75 and 76 shown in fig. 3 between the first and second main fitting portions 71 and 72 in the axial direction of the cylinder 17. The first sandwiching portion 75 is arc-shaped to continuously cover the outer peripheral surface 21a of the side wall portion 21 of the outer tube 14 in a range less than half a circumference. The second sandwiching portion 76 is also arc-shaped to continuously cover the outer peripheral surface 21a of the side wall portion 21 of the outer tube 14 in a range less than half a circumference. The first main fitting portion 71 and the second main fitting portion 72 shown in fig. 2, and the first clamping portion 75 and the second clamping portion 76 shown in fig. 3 form part of the same cylinder, respectively.

The first main fitting portion 71 and the second main fitting portion 72 are fitted to the outer peripheral portion of the side wall portion 21 of the outer tube 14, respectively, and the first sandwiching portion 75 and the second sandwiching portion 76 sandwich the outer peripheral portion of the side wall portion 21 of the outer tube 14 from the diametrically opposite sides.

As shown in fig. 2, the first extension portion 61 extends radially outward of the first clamp portion 75, the first main fitting portion 71, and the second main fitting portion 72 from an end edge portion of the first clamp portion 75 opposite to the punched hole 65 and an end edge portion of the first main fitting portion 71 and an end edge portion of the second main fitting portion 72 near both sides thereof. The first extension 61 extends parallel to the central axis of the fitting portion 60.

The second extension portion 62 shown in fig. 3 extends radially outward of the second clamp portion 76, the first main fitting portion 71, and the second main fitting portion 72 from an end edge portion of the second clamp portion 76 opposite to the punched hole 65 and an end edge portion of the first main fitting portion 71 and an end edge portion of the second main fitting portion 72 near both sides thereof. The second extension 62 extends parallel to the central axis of the fitting portion 60.

The first bracket 15 is formed into the above-described shape from a single flat plate material by forming by press working. The second main fitting portion 72 is fitted to the side wall portion 21 on the bottom 22 side in the axial direction of the cylinder 17. The first main fitting portion 71 is fitted to the side wall portion 21 on the opposite side of the bottom portion 22 in the axial direction of the cylinder 17 than the second main fitting portion 72. The first clamping portion 75 and the second clamping portion 76 are in a state of clamping the side wall portion 21.

In this state, the first bracket 15 is fixed to the outer tube 14 by welding. Then, the first bracket 15 covers the outer peripheral surface 21a of the side wall portion 21 of the outer tube 14, that is, the outer peripheral surface 21a of the cylinder 17, at the fitting portion 60, and the pair of substantially flat first extending portions 61 and the second extending portion 62 extend from the fitting portion 60 substantially parallel to each other to the outside in the radial direction of the outer tube 14, that is, the cylinder 17. Therefore, the first bracket 15 is formed by molding a plate material so as to cover at least a part of the outer peripheral side of the cylinder 17, and is fixed to the cylinder 17.

Here, as shown in fig. 3, a projection 81 that protrudes radially outward from the outer peripheral surface 75a of the first clamp 75 may be formed on the end edge portion of the first clamp 75 on the punching hole 65 side, on the outer peripheral side that is the radially outer side (curved convex side) of the first clamp 75, depending on the finished product of the first bracket 15. The protruding portion 81 is a burr or burr generated when the punched hole 65 is formed by press working. If burrs or burrs protrude radially inward from the radially inner peripheral surface 75b of the first clamping portion 75 to the radially inner peripheral side (curved concave side) of the first clamping portion 75, the protruding portions interfere when the outer tube 14 is fitted. Accordingly, the fitting portion 60 is formed by bending such that the protruding portion 81 protrudes radially outward from the outer peripheral surface 75a even after the protruding portion 81 is formed, in accordance with the punching direction of the punching process of the punching hole 65 performed in a flat plate-like plate material as the material of the first bracket 15.

The pair of first extending portions 61 and the second extending portion 62 of the first bracket 15 are coupled to a knuckle (not shown) on the wheel side. That is, the first bracket 15 is a knuckle bracket that is coupled to the knuckle.

The second bracket 16 has an arc-shaped portion 91 which is fixed to the first bracket 15 in an arc shape as a whole, and a holding portion 92 which extends from the arc-shaped portion 91 and holds other members.

The arcuate portion 91 includes a first arcuate portion 101 having a shape forming a part of a cylinder, a second arcuate portion 102 having a shape forming a part of a cylinder, and a flat plate-shaped connecting portion 103 connecting the first arcuate portion 101 and the second arcuate portion 102. The connecting portion 103 extends from one end edge portion of the first arcuate portion 101 in the circumferential direction in a direction extending the first arcuate portion 101 substantially. The second arcuate portion 102 extends from an end edge portion of the connecting portion 103 opposite to the first arcuate portion 101 in a direction extending the connecting portion 103 substantially. The arcuate portion 91 is fixed to the outer peripheral surface 75a of the first clamping portion 75 of the first bracket 15 at the first arcuate portion 101.

As shown in fig. 4, the second bracket 16 has a plurality of protrusions 111 protruding radially inward from the radially inward (curved concave side) inner peripheral surface 101a of the first arcuate portion 101 at intervals in the circumferential direction of the first arcuate portion 101 in a state before being attached to the first bracket 15. The plurality of protruding portions 111 are aligned in the axial direction of the first arcuate portion 101.

The first arcuate portion 101 is formed such that the recess 112 is aligned with the protruding portion 111 and the first arcuate portion 101 in the axial direction and in the circumferential direction. The concave portion 112 is recessed further radially inward than the radially outer (curved convex side) outer peripheral surface 101 b. The concave portion 112 is a portion secondarily formed to form the protruding portion 111 on the plate-shaped raw material by plastic deformation. Therefore, the second bracket 16 has a plurality of, specifically, two concave portions 112, which are identical to the protruding portions 111, at intervals in the circumferential direction of the first arcuate portion 101.

The second arcuate portion 102 is located outside the first arcuate portion 101 in the circumferential direction in which the plurality of protruding portions 111 are formed, and is formed to expand in the outer radial direction than the first arcuate portion 101. The second arcuate portion 102 has the same thickness in the radial direction as the first arcuate portion 101. The second arcuate portion 102 is coaxial with the first arcuate portion 101, has an outer diameter larger than the first arcuate portion 101, and has an inner diameter larger than the first arcuate portion 101. In other words, the diameter of the inner peripheral surface 102a of the second arcuate portion 102 on the radially inner side (curved concave side) is larger than the inner peripheral surface 101a of the first arcuate portion 101. The outer peripheral surface 102b of the second arcuate portion 102 on the radially outer side (curved convex side) has a larger diameter than the outer peripheral surface 101b of the first arcuate portion 101.

The connecting portion 103 extends from the end edge portion on the second arcuate portion 102 side in the circumferential direction of the first arcuate portion 101 toward the second arcuate portion 102 and is connected to the end edge portion on the first arcuate portion 101 side in the circumferential direction of the second arcuate portion 102. The coupling portion 103 has a coupling surface 103a and a coupling surface 103b. The connecting surface 103a connects the inner peripheral surface 101a of the first arcuate portion 101 and the inner peripheral surface 102a of the second arcuate portion 102. The connecting surface 103b connects the outer peripheral surface 101b of the first arcuate portion 101 and the outer peripheral surface 102b of the second arcuate portion 102. The connecting portion 103 extends so as to be located outside the first and second arcuate portions 101 and 102 in the radial direction as approaching the second arcuate portion 102 from the first arcuate portion 101 in the circumferential direction of the first and second arcuate portions 101 and 102. The arcuate portion 91 having the first arcuate portion 101, the connecting portion 103, and the second arcuate portion 102 is stepped arcuate.

The second bracket 16 is formed into the above-described shape from one sheet material by molding by press working. The second bracket 16 is disposed so that the first arcuate portion 101 covers the outer peripheral surface 75a of the first clamping portion 75 of the first bracket 15, and abuts the outer peripheral surface 75a of the first clamping portion 75 at the plurality of protruding portions 111. At this time, the inner peripheral surface 101a and the outer peripheral surface 101b of the first arcuate portion 101 and the inner peripheral surface 101a and the outer peripheral surface 102b of the second arcuate portion 102 are disposed substantially coaxially with the outer peripheral surface 75a of the first clamping portion 75, and the plurality of protruding portions 111 are disposed so as to be aligned at positions in the axial direction of the first clamping portion 75 and to be separated in the circumferential direction of the first clamping portion 75.

At this time, the second bracket 16 has a plurality of protruding portions 111 and a second arcuate portion 102. At least a part of the protruding portion 111 is a first arcuate portion 101 formed in an arcuate shape. The plurality of protruding portions 111 protrude toward the inner peripheral side of the first arcuate portion 101. The second arcuate portion 102 is disposed on the outer side in the circumferential direction of the first arcuate portion 101. The second arcuate portion 102 is formed to expand in the outer diameter direction than the first arcuate portion 101.

In this state, the plurality of protruding portions 111 are fixed to the first clamping portion 75 by resistance welding such as projection welding. Then, the plurality of protruding portions 111 of the second bracket 16 and the portions of the first clamping portion 75 of the first bracket 15 that come into contact with the protruding portions 111 are melted and integrated, respectively, to form a plurality of fixing portions 121 shown in fig. 3. The plurality of fixing portions 121 are provided from the first arcuate portion 101 to the first clamping portion 75, and join the first arcuate portion 101 and the first clamping portion 75. In this state, the inner peripheral surface 101a and the outer peripheral surface 101b of the first arcuate portion 101 and the inner peripheral surface 102a and the outer peripheral surface 102b of the second arcuate portion 102 of the second bracket 16 are disposed closer to the outer peripheral surface 75a of the first clamping portion 75 than before welding, and are disposed substantially coaxially with the outer peripheral surface 75 a.

In this way, the second bracket 16 fixed to the first bracket 15 is arranged such that the arcuate portion 91 has a plurality of fixing portions 121 provided in the circumferential direction of the first bracket 15 and overlaps the outer peripheral side of the first bracket 15. In addition, the second bracket 16 is fixed to the first bracket 15 by resistance welding at the fixing portion 121. In this state, the arcuate portion 91 is formed such that the curvature of the second arcuate portion 102, which is the circumferential outer portion, is expanded in the outer diameter direction at least more than the curvature between the fixing portion 121 and the fixing portion 121 of the first arcuate portion 101. The first arcuate portion 101 of the arcuate portion 91 is joined to the first bracket 15, while the second arcuate portion 102 and the second arcuate portion 102 of the coupling portion 103 are separated from the first bracket 15.

The second arcuate portion 102 side portion of the connecting portion 103 of the arcuate portion 91 and the second arcuate portion 102 are separated from the punched hole 65 side end edge portion of the first clamping portion 75 radially outward of the first clamping portion 75. Here, as described above, according to the finished product of the first bracket 15, the protruding portion 81 protruding radially outward from the outer peripheral surface 75a of the first clamping portion 75 may be formed at the end edge portion of the first clamping portion 75 on the punching hole 65 side. The second arcuate portion 102 side portion of the connecting portion 103 of the arcuate portion 91 or the second arcuate portion 102 overlaps with the position of the protruding portion 81 in the circumferential direction of the first clamping portion 75. The second arcuate portion 102 and the portion of the connecting portion 103 of the arcuate portion 91 on the second arcuate portion 102 side are separated from the protruding portion 81 to the outside in the radial direction of the first clamping portion 75. The second bracket 16 is completely out of contact with the protrusion 81 of the first bracket 15 and is completely separated from the protrusion 81.

After welding to the first bracket 15, the periphery of the fixing portion 121 of the first arcuate portion 101 of the second bracket 16 may be in contact with the first clamping portion 75 of the first bracket 15. However, even if the first clamp portion 75 has the protruding portion 81, the second bracket 16 does not come into contact with the protruding portion 81. That is, the second bracket 16 has the following configuration: the gap between the first bracket 15 and the portion other than the protruding portion 111 is ensured while suppressing a decrease in the seating area of the protruding portion 111 that abuts against the first bracket 15 as the assembly target member.

The holding portion 92 extends from an end edge portion of the second arcuate portion 102 on the opposite side of the connecting portion 103 in the circumferential direction in a direction opposite to the connecting portion 103. The holding portion 92 is formed to extend in the outer diameter direction of the second arcuate portion 102 more than the second arcuate portion 102. In the case where the hose is held by the holding portion 92, the second bracket 16 is a hose bracket. In the case where the harness is held by the holding portion 92, the second bracket 16 is a harness bracket.

The method for manufacturing the damper 11 according to the first embodiment includes a first bracket preparation step of preparing the first bracket 15, and the fitting portion 60 of the first bracket 15, which is at least a part, is formed in an arc shape.

The method of manufacturing the damper 11 according to the first embodiment includes a second bracket preparation step of preparing the second bracket 16, and the second bracket 16 includes the plurality of protruding portions 111 and the second arcuate portion 102. At least a part of the protruding portion 111 is a first arcuate portion 101 formed in an arcuate shape. The protruding portion 111 protrudes toward the inner peripheral side of the first arcuate portion 101. The second arcuate portion 102 is disposed on the outer side in the circumferential direction of the first arcuate portion 101. The second arcuate portion 102 is formed to expand in the outer diameter direction than the first arcuate portion 101.

The method of manufacturing the shock absorber 11 according to the first embodiment includes a first bracket welding step of fixing the first bracket 15 prepared in the first bracket preparation step to the cylinder 17. In this first bracket welding step, the first bracket 15 is brought into a state in which the second main fitting portion 72 is fitted to the outer peripheral surface 21a of the side wall portion 21 on the bottom 22 side in the axial direction of the cylinder 17, the first main fitting portion 71 is fitted to the outer peripheral surface 21a of the side wall portion 21 on the opposite side of the bottom 22 side in the axial direction of the cylinder 17 than the second main fitting portion 72, and the first clamping portion 75 and the second clamping portion 76 are brought into contact with the outer peripheral surface 21a of the side wall portion 21. In the first bracket welding step, the first bracket 15 is fixed to the outer tube 14 of the cylinder 17 by welding in this state.

The method of manufacturing the damper 11 according to the first embodiment includes a second bracket arrangement step of arranging the second bracket 16 prepared in the second bracket preparation step so that the protruding portion 111 abuts against the outer periphery of the first bracket 15. In this second bracket disposing step, the second bracket 16 is disposed so that the first arcuate portion 101 covers the outer peripheral surface 75a of the first clamping portion 75 of the first bracket 15, and the plurality of protruding portions 111 are brought into contact with the outer peripheral surface 75a of the first clamping portion 75. At this time, the second bracket 16 is disposed in parallel with the central axis of the first arcuate portion 101 and the central axis of the second arcuate portion 102, and the plurality of protruding portions 111 are disposed so as to be aligned at positions in the axial direction of the first clamping portion 75 and to be separated in the circumferential direction of the first clamping portion 75. In the second bracket arrangement step, the second bracket 16 is abutted against the first bracket 15 only at the two protruding portions 111. Even if the first bracket 15 has the protruding portion 81, the second bracket 16 does not come into contact with the protruding portion 81.

The method for manufacturing the damper 11 according to the first embodiment includes a second bracket welding step of performing resistance welding such as projection welding by passing current between the plurality of protruding portions 111 of the second bracket 16 and the first bracket 15 in the second bracket arrangement step, and the second bracket 16 is arranged so as to abut on the outer periphery of the first bracket 15 at the plurality of protruding portions 111. In the second bracket welding step, the two protruding portions 111 of the second bracket 16 and the portions of the first clamping portion 75 of the first bracket 15 that come into contact with the protruding portions 111 are melted and integrated, respectively, to form two fixing portions 121. In the second bracket welding step, the two protruding portions 111 are melted, and the arcuate portion 91 approaches the first clamping portion 75, but even if the first bracket 15 has the protruding portion 81, the second bracket 16 does not come into contact with the protruding portion 81.

The second bracket welding step is performed after the second bracket placement step, but the first bracket welding step may be performed before the second bracket placement step or after the second bracket welding step.

Patent documents 1 and 2 disclose mounting brackets to a damper. However, in such a mounting structure, it is desirable to suppress a decrease in welding quality in mounting the bracket to the base member by resistance welding. As a cause of the reduction in welding quality of the resistance welding, there is a shunt in which current flows at a portion other than the welding target.

In contrast, the damper 11 according to the first embodiment includes the first bracket 15 as the arcuate base member, and the second bracket 16 includes the plurality of fixing portions 121 and the arcuate portions 91 provided in the circumferential direction of the first bracket 15. The fixing portion 121 is disposed so as to overlap with the outer peripheral side of the first bracket 15. The fixing portion 121 is fixed to the first bracket 15 by resistance welding. The arcuate portion 91 is formed such that the curvature of the second arcuate portion 102, which is a circumferential outer portion with respect to the first arcuate portion 101 between the fixed portions 121 and 121, is at least wider in the outer radial direction than the curvature of the first arcuate portion 101 between the fixed portions 121 and 121.

More specifically, the damper 11 of the first embodiment has a first bracket 15 formed by molding a plate material so as to cover at least a part of the outer peripheral side of the cylinder 17, and is fixed to the cylinder 17. The damper 11 includes a second bracket 16, and the second bracket 16 includes a holding portion 92 for holding other members, a plurality of fixing portions 121 in the circumferential direction of the first bracket 15, and an arcuate portion 91. The fixing portion 121 is disposed so as to overlap with the outer peripheral side of the first bracket 15. The fixing portion 121 is fixed to the first bracket 15 by resistance welding. The arcuate portion 91 is formed such that the curvature of the second arcuate portion 102, which is a circumferential outer portion with respect to the first arcuate portion 101 between the fixed portions 121 and 121, is at least wider in the outer radial direction than the curvature of the first arcuate portion 101 between the fixed portions 121 and 121.

The method of manufacturing the damper 11 according to the first embodiment includes a first bracket preparation step and a second bracket preparation step. In the first bracket preparation step, the first bracket 15, at least a part of which has the fitting portion 60 formed in an arc shape, is prepared. In the second bracket preparation step, a second bracket 16 is prepared, and the second bracket 16 has: a plurality of protruding portions 111, at least a part of which is a first arcuate portion 101 formed in an arcuate shape, protruding toward the inner peripheral side of the first arcuate portion 101; the second arcuate portion 102 is located outside the first arcuate portion 101 in the circumferential direction and is formed to expand in the outer radial direction than the first arcuate portion 101.

The method for manufacturing the damper 11 according to the first embodiment includes: a first bracket welding step of fixing the first bracket 15 prepared in the first bracket preparation step to the cylinder 17; a second bracket arrangement step of arranging the second bracket 16 prepared in the second bracket preparation step so that the protruding portion 111 abuts against the outer periphery of the first bracket 15; and a second bracket welding step of performing resistance welding by energizing a current between the first bracket 15 and the plurality of protruding portions 111.

According to the first embodiment described above, in welding the second bracket 16 to the first bracket 15, it is possible to suppress the current from being split to flow in the portions other than the plurality of protruding portions 111 to be welded. Therefore, a decrease in welding quality can be suppressed. In addition, the accuracy of the second bracket 16 and the first bracket 15, which are required to be high in order to prevent the split flow, can be reduced, and productivity can be improved. In addition, even if some tilting occurs in the second bracket 16 when the second bracket 16 is pressed in the radial direction at the time of welding the second bracket 16 to the first bracket 15, the split flow can be suppressed. In addition, the degree of freedom in layout of the second bracket 16 and the first bracket 15, which are limited in layout due to the split flow, can be increased. In addition, design restrictions and process restrictions for the shunt countermeasure can be relaxed, and the degree of freedom in design and process can be increased.

In particular, depending on the finished product, the first bracket 15 may have a projection 81 protruding radially outward from the outer peripheral surface 75a of the first clamping portion 75 at the end edge portion of the first clamping portion 75 on the punching hole 65 side. Therefore, if the arcuate portion 91 of the second bracket 16 has a constant curved shape, there is a possibility that a portion other than the plurality of protruding portions 111 to be welded, that is, a portion of the arcuate portion 91 facing the protruding portion 81 approaches the protruding portion 81, and a split flow occurs. In contrast, in the first embodiment, the arcuate portion 91 has the second arcuate portion 102 formed to extend in the outer radial direction than the first arcuate portion 101, and thus has a shape separated from the protruding portion 81. Therefore, the portions other than the plurality of protruding portions 111 to be welded, that is, the portions of the arcuate portions 91 facing the protruding portions 81 can be prevented from approaching the protruding portions 81 to cause a split flow. Therefore, the current can be suppressed from being split to flow in the portions other than the plurality of protruding portions 111 to be welded. Therefore, a decrease in welding quality can be suppressed.

The second arcuate portion 102 of the second bracket 16, which is a circumferential outer portion with respect to the first arcuate portion 101 between the fixing portions 121 and 121, is separated from the first bracket 15, which is a base member. Therefore, the current can be further suppressed from being split to flow in the portions other than the plurality of protruding portions 111 to be welded, and therefore, the reduction in welding quality can be further suppressed.

Second embodiment

A second embodiment of the present invention will be described mainly with reference to fig. 5, focusing on a difference from the first embodiment. The parts common to the first embodiment are denoted by the same reference numerals.

The damper 11A (bracket fixing member) of the second embodiment is provided with a second bracket 16A instead of the second bracket 16 of the first embodiment.

The second bracket 16A has an arcuate portion 91A partially different from the arcuate portion 91 and a holding portion 92 similar to the first embodiment. The arc portion 91A is also entirely arc-shaped. The second bracket 16A is fixed to the first bracket 15 at the arcuate portion 91A.

The arcuate portion 91A has a first arcuate portion 101 similar to the first embodiment and a second arcuate portion 102A partially different from the second arcuate portion 102. The second arcuate portion 102A extends from one end edge portion of the first arcuate portion 101 in the circumferential direction in a direction extending the first arcuate portion 101. The arcuate portion 91A is fixed to the outer peripheral surface 75a of the first clamping portion 75 of the first bracket 15 at the first arcuate portion 101.

The outer peripheral surface 102Ab of the second arcuate portion 102A on the radially outer side (curved convex side) is disposed on the same cylindrical surface as the outer peripheral surface 101b of the first arcuate portion 101. In other words, the outer peripheral surface 101b of the first arcuate portion 101 is continuous coaxially and radially with the outer peripheral surface 102Ab of the second arcuate portion 102A. The inner peripheral surface 102Aa of the second arcuate portion 102A on the radially inner side (curved concave side) is recessed radially outward from the inner peripheral surface 101a of the first arcuate portion 101. Thus, the second arcuate portion 102A is formed such that the inner peripheral surface 102Aa extends further outward in the circumferential direction than the inner peripheral surface 101a of the first arcuate portion 101 and further extends in the radial direction than the inner peripheral surface 101a of the first arcuate portion 101. The inner peripheral surface 102Aa of the second arcuate portion 102A is a curved surface. The second arcuate portion 102A has a radially thinner thickness toward the middle in the circumferential direction, and the radially thickest portion has the same thickness as the first arcuate portion 101.

The second bracket 16A is formed into the above-described shape from one sheet material by molding by press working. The second bracket 16A is disposed so that the first arcuate portion 101 covers the outer peripheral surface 75a of the first clamping portion 75 of the first bracket 15, and abuts against the outer peripheral surface 75a of the first clamping portion 75 at the plurality of protruding portions 111 (see fig. 4). At this time, in the second bracket 16A, the inner peripheral surface 101a and the outer peripheral surface 101b of the first arcuate portion 101 and the outer peripheral surface 102Ab of the second arcuate portion 102A are disposed substantially coaxially with the first clamping portion 75, and the plurality of protruding portions 111 (see fig. 4) are disposed so as to be aligned at positions in the axial direction of the first clamping portion 75 and to be separated in the circumferential direction of the first clamping portion 75.

At this time, the second bracket 16A has a plurality of protruding portions 111 (see fig. 4) and a second arcuate portion 102A. At least a part of the protruding portion 111 is a first arcuate portion 101 formed in an arcuate shape. The protruding portion 111 protrudes toward the inner peripheral side of the first arcuate portion 101. The second arcuate portion 102A is disposed further outside in the circumferential direction than the inner circumferential surface 101a of the first arcuate portion 101. The second arcuate portion 102A includes an inner peripheral surface 102Aa, and the inner peripheral surface 102Aa is formed to extend in the outer radial direction than the inner peripheral surface 101a of the first arcuate portion 101.

In this state, the plurality of protruding portions 111 (see fig. 4) are fixed to the first clamping portion 75 by resistance welding such as projection welding. Then, the plurality of protruding portions 111 (see fig. 4) of the second bracket 16A and the portions of the first clamping portion 75 of the first bracket 15 that come into contact with the respective protruding portions 111 (see fig. 4) are melted and integrated, respectively, to form a plurality of fixing portions 121. In this state, the inner peripheral surface 101a and the outer peripheral surface 101b of the first arcuate portion 101 of the second bracket 16A and the outer peripheral surface 102Ab of the second arcuate portion 102A are disposed closer to the outer peripheral surface 75a of the first clamping portion 75 than before welding, and are disposed substantially coaxially with the outer peripheral surface 75 a.

In this way, the arcuate portion 91A of the second bracket 16A fixed to the first bracket 15 has a plurality of fixing portions 121 provided in the circumferential direction of the first bracket 15, and the fixing portions 121 are arranged so as to overlap the outer circumferential side of the first bracket 15, and are fixed to the first bracket 15 by resistance welding. In this state, the arcuate portion 91A is formed such that the curvature of the inner peripheral surface 102Aa of the second arcuate portion 102A, which is the circumferential outer portion, is expanded in the outer radial direction at least more than the curvature between the fixing portion 121 and the fixing portion 121 of the inner peripheral surface 101A of the first arcuate portion 101. The first arcuate portion 101 of the arcuate portion 91A is in contact with the first bracket 15, while the second arcuate portion 102A is separated from the first bracket 15.

In this state, the inner peripheral surface 102Aa of the second arcuate portion 102A of the arcuate portion 91A is separated from the end edge portion of the first clamping portion 75 on the punching hole 65 side to the outer side in the radial direction of the first clamping portion 75. Here, as described above, according to the finished product of the first bracket 15, the protruding portion 81 protruding radially outward from the outer peripheral surface 75a of the first clamping portion 75 may be formed at the end edge portion of the first clamping portion 75 on the punching hole 65 side. The arcuate portion 91A overlaps the protruding portion 81 with the second arcuate portion 102A in the circumferential direction of the first clamping portion 75. The second arcuate portion 102A of the arcuate portion 91A is separated from the protruding portion 81 radially outward of the first clamping portion 75. The second bracket 16A is completely out of contact with the projection 81 of the first bracket 15 and is completely separated from the projection 81.

After welding to the first bracket 15, the periphery of the fixing portion 121 of the first arcuate portion 101 of the second bracket 16A may be in contact with the first bracket 15. However, even if the first clamp portion 75 has the protruding portion 81, the second bracket 16A does not come into contact with the protruding portion 81. That is, the second bracket 16A has the following configuration: the clearance between the first bracket 15 and the portion other than the protruding portion 111 (see fig. 4) is ensured while suppressing a decrease in seating area of the protruding portion 111 (see fig. 4) that abuts against the first bracket 15 as the assembly target member.

The holding portion 92 extends from an end edge portion of the second arcuate portion 102A on the opposite side of the first arcuate portion 101 in the circumferential direction in the direction opposite to the first arcuate portion 101. The holding portion 92 is formed to extend in the outer diameter direction of the second arcuate portion 102A more than the second arcuate portion 102A.

The method of manufacturing the damper 11A according to the second embodiment includes a first bracket preparation step of preparing the first bracket 15, a second bracket preparation step of preparing the second bracket 16A, and a first bracket welding step similar to the first embodiment.

The method of manufacturing the damper 11A according to the second embodiment includes a second bracket arrangement step of arranging the second bracket 16A prepared in the second bracket preparation step so that the protruding portion 111 (see fig. 4) is in contact with the outer periphery of the first bracket 15. In this second bracket arrangement step, the second bracket 16A is in contact with the first bracket 15 only at the two protruding portions 111 (see fig. 4). Even if the first bracket 15 has the protruding portion 81, the second bracket 16A does not come into contact with the protruding portion 81.

In addition, the method for manufacturing the damper 11A according to the second embodiment includes a second bracket welding step of performing resistance welding such as projection welding by passing current between the plurality of protruding portions 111 (see fig. 4) of the second bracket 16A and the first bracket 15 in the second bracket arrangement step, and the second bracket 16A is arranged so as to abut on the outer periphery of the first bracket 15 at the plurality of protruding portions 111 (see fig. 4). In this second bracket welding step, the two protruding portions 111 (see fig. 4) of the second bracket 16A and the portions of the first clamping portion 75 of the first bracket 15 that come into contact with the protruding portions 111 (see fig. 4) are melted and integrated, respectively, to form two fixing portions 121. Even if the first bracket 15 has the projection 81, the second bracket 16A does not come into contact with the projection 81 in the second bracket welding step.

In the same manner as in the method for manufacturing the damper 11A according to the second embodiment, the first bracket welding step may be performed before the second bracket disposing step or after the second bracket welding step.

The damper 11A of the second embodiment includes a first bracket 15 as an arcuate base member, and a second bracket 16A, and the second bracket 16A includes a plurality of fixing portions 121 and arcuate portions 91A provided in the circumferential direction of the first bracket 15. The fixing portion 121 is disposed so as to overlap with the outer peripheral side of the first bracket 15. The fixing portion 121 is fixed to the first bracket 15 by resistance welding. The arcuate portion 91A is formed such that the curvature of the inner peripheral surface 102Aa of the second arcuate portion 102A, which is a circumferential outer portion with respect to the first arcuate portion 101 between the fixing portions 121 and 121, is at least wider in the outer radial direction than the curvature of the inner peripheral surface 101A of the first arcuate portion 101 between the fixing portions 121 and 121.

More specifically, the damper 11A of the second embodiment has a first bracket 15, and the first bracket 15 is formed by molding a plate material so as to cover at least a part of the outer peripheral side of the cylinder 17, and is fixed to the cylinder 17. The damper 11A includes a second bracket 16A, and the second bracket 16A includes a holding portion 92 for holding other members, a plurality of fixing portions 121 in the circumferential direction of the first bracket 15, and an arcuate portion 91A. The arcuate portion 91A is disposed so as to overlap the outer peripheral side of the first bracket 15, and the fixing portion 121 is fixed to the first bracket 15 by resistance welding. The arcuate portion 91A is formed such that the curvature of the inner peripheral surface 102Aa of the second arcuate portion 102A, which is a circumferential outer portion with respect to the first arcuate portion 101 between the fixing portions 121 and 121, is at least wider in the outer radial direction than the curvature of the inner peripheral surface 101A of the first arcuate portion 101 between the fixing portions 121 and 121.

The method of manufacturing the damper 11A according to the second embodiment includes a first bracket preparation step of preparing the first bracket 15, and the fitting portion 60 of the first bracket 15, which is at least a part, is formed in an arc shape. The method of manufacturing the damper 11A according to the second embodiment includes a second bracket preparation step. In the second tray preparation step, the second tray 16A is prepared. The second bracket 16A includes a plurality of protruding portions 111 (see fig. 4) and a second arcuate portion 102A. At least a part of the protruding portion 111 is a first arcuate portion 101 formed in an arcuate shape, and protrudes toward the inner peripheral side of the first arcuate portion 101. The arcuate portion 102A is located on the outer side of the first arcuate portion 101 in the circumferential direction, and has an inner peripheral surface 102Aa, and the inner peripheral surface 102Aa is formed to expand in the outer radial direction than the inner peripheral surface 101a of the first arcuate portion 101. The method for manufacturing the buffer 11A according to the second embodiment includes: a first bracket welding step of fixing the first bracket 15 prepared in the first bracket preparation step to the cylinder 17; a second bracket arrangement step of arranging the second bracket 16A prepared in the second bracket preparation step so that the protruding portion 111 (see fig. 4) abuts against the outer periphery of the first bracket 15; and a second bracket welding step of performing resistance welding by energizing a current between the first bracket 15 and the plurality of protruding portions 111 (see fig. 4).

According to the above second embodiment, as in the first embodiment, in welding the second bracket 16A to the first bracket 15, it is possible to suppress the current from being split to flow in the portions other than the plurality of protruding portions 111 (see fig. 4) to be welded. Therefore, a decrease in welding quality can be suppressed.

Third embodiment

A third embodiment of the present invention will be described mainly with reference to fig. 6, focusing on a difference from the first embodiment. The parts common to the first embodiment are denoted by the same reference numerals.

In the damper 11B (bracket fixing member) of the third embodiment, an insulating material 131 is provided between the first bracket 15 and the second bracket 16. The insulating material 131 is provided in the second bracket 16 to cover the first clamping portion 75 of the first bracket 15 and is the entire range except for the plurality of protruding portions 111. The insulating material 131 is formed in a seat shape of the hole 132 at the position of the plurality of protruding portions 111. The insulating material 131 is adhered to the outer peripheral surface 75a of the first clamping portion 75. The insulating material 131 may be formed by applying an insulating liquid to the outer peripheral surface 75a of the first clamping portion 75 except for the positions where the plurality of protruding portions 111 are brought into contact and hardening the same.

The plurality of protruding portions 111 of the second bracket 16 are brought into contact with the outer peripheral surface 75a of the first clamping portion 75 of the first bracket 15 through the respective corresponding hole portions 132 of the insulating material 131. In this state, the plurality of protruding portions 111 are fixed to the first clamping portion 75 by resistance welding such as projection welding. Then, the two protruding portions 111 of the second bracket 16 and the portions of the first clamping portion 75 of the first bracket 15 that come into contact with the protruding portions 111 are melted and integrated, respectively, to become the fixing portions 121B.

The method of manufacturing the damper 11B according to the third embodiment includes a first bracket preparation step of preparing the first bracket 15, a second bracket preparation step of preparing the second bracket 16A, and a first bracket welding step similar to the first embodiment. The first bracket preparation step includes a step of disposing the insulating material 131 on the outer peripheral surface 75a of the first clamping portion 75 of the first bracket 15.

The method of manufacturing the damper 11B according to the third embodiment includes a second bracket arrangement step of arranging the second bracket 16 prepared in the second bracket preparation step so that the protruding portion 111 is in contact with the outer periphery of the first bracket 15. In this second bracket arrangement step, the two protruding portions 111 of the second bracket 16 are brought into contact with the outer peripheral surface 75a of the first clamping portion 75 through the respective corresponding hole portions 132 of the insulating material 131. In the second bracket arrangement step, the second bracket 16 is in contact with the first bracket 15 only at the two protruding portions 111. Even if the first bracket 15 has the protruding portion 81, the second bracket 16 does not come into contact with the protruding portion 81.

In addition, the method for manufacturing the damper 11B according to the third embodiment includes a second bracket welding step of performing resistance welding such as projection welding by passing current between the plurality of protruding portions 111 of the second bracket 16 and the first bracket 15 in the second bracket arrangement step, and the second bracket 16 is arranged so as to abut on the outer periphery of the first bracket 15 at the plurality of protruding portions 111. In this second bracket welding step, the two protruding portions 111 of the second bracket 16 and the portions of the first clamping portion 75 of the first bracket 15 that come into contact with the protruding portions 111 are melted and integrated, respectively, to form two fixing portions 121B. Even if the first bracket 15 has the projection 81, the second bracket 16 does not come into contact with the projection 81 in the second bracket welding step.

In the same manner as in the method for manufacturing the damper 11B according to the third embodiment, the first bracket welding step may be performed before the second bracket disposing step or after the second bracket welding step.

In the damper 11B of the third embodiment, an insulating material 131 is provided at a position other than the protruding portion 111 between the first bracket 15 and the second bracket 16. Therefore, in welding the second bracket 16 to the first bracket 15, the current can be further suppressed from being split to flow in the portions other than the plurality of protruding portions 111 to be welded. Therefore, the reduction in welding quality can be further suppressed.

In the first to third embodiments described above, the case where the second brackets 16, 16A are welded to the first bracket 15 as the circular arc-shaped base member has been described as an example, but for example, the case where the plurality of protruding portions 111 of the second bracket 16 are brought into contact with the side wall portion 21 of the outer tube 14 of the cylindrical cylinder 17 and welded directly, and the second brackets 16, 16A are welded directly to the cylindrical cylinder 17 instead of being welded directly to the first bracket 15 as in the damper 11C (bracket fixing member) shown in fig. 7 may be applied. In the case of changing the third embodiment, the insulating material 131 is provided at the portion of the side wall portion 21 of the outer tube 14 covered with the first arcuate portion 101.

In addition, the case where the second brackets 16, 16A are attached to the first brackets 15 or the cylinders 17 by welding in the dampers 11, 11A to 11C has been described as an example, but the present invention may be applied to a case where brackets are attached to the base member by welding other than the dampers. That is, in the case of welding the bracket to the cylindrical or arc-shaped base member, the bracket may be configured as follows: the bracket is provided with an arc-shaped portion formed such that a curvature of a portion outside in the circumferential direction is expanded in the outer diameter direction at least more than a curvature between the plurality of fixing portions.

The bracket fixing member according to the first aspect of the above-described embodiment includes: a cylindrical or arc-shaped base member; and a bracket having a plurality of fixing portions provided in a circumferential direction of the base member, the fixing portions being arranged so as to overlap an outer circumferential side of the base member, the fixing portions being fixed to the base member by resistance welding, the bracket including an arcuate portion formed such that a curvature of a circumferential outer portion is expanded in an outer radial direction at least more than a curvature between the plurality of fixing portions. This can suppress a decrease in welding quality.

A bracket fixing member according to a second aspect of the present invention is the bracket fixing member according to the first aspect, wherein the outer circumferential portion of the bracket is separated from the base member.

A damper according to a third aspect of the present invention is a damper including a cylindrical cylinder, and includes a first bracket and a second bracket. The first bracket is formed by molding a plate material so as to cover at least a part of the outer peripheral side of the cylinder. The first bracket is fixed to the cylinder. The second bracket includes a holding portion, a plurality of fixing portions, and an arc portion. The holding portion holds other members. The fixing portion is provided in a circumferential direction of a base member constituted by the cylinder or the first bracket. The fixing portion is disposed so as to overlap with the outer peripheral side of the base member, and is fixed to the base member by resistance welding. The arcuate portion is formed such that a curvature of the circumferential outer portion is expanded in the outer diameter direction at least more than a curvature between the plurality of fixing portions. This can suppress a decrease in welding quality.

A damper according to a fourth aspect of the present invention is the damper according to the third aspect, wherein the circumferential outer portion of the second bracket is separated from the base member.

A method for manufacturing a damper according to a fifth aspect of the present invention is a method for manufacturing a damper including a cylindrical cylinder, including: a step of preparing a first bracket and a second bracket, wherein at least a part of the first bracket is formed in an arc shape, and the second bracket comprises: a plurality of protruding portions, at least a part of which is a first arc-shaped portion formed in an arc shape, protruding toward an inner peripheral side of the first arc-shaped portion; a second arcuate portion located outside the first arcuate portion in the circumferential direction and formed in an arcuate shape so as to extend in the outer radial direction than the first arcuate portion; a step of fixing the first bracket to the cylinder; a step of disposing the second bracket so that the protruding portion is brought into contact with an outer periphery of a base member constituted by the cylinder or the first bracket; and a step of performing resistance welding by energizing a current between the base member and the protruding portion. This can suppress a decrease in welding quality.

Industrial applicability

Description of the reference numerals

11. 11A, 11B, 11C buffer (bracket fixing part)

15 first bracket (base component)

16. 16A second bracket (bracket)

17 jar (base component)

91. 91A arc-shaped part

92. Holding part

101. A first arc-shaped part

102. 102A second arc-shaped part (circumferential outside part)

111. Protruding part

121. Fixing part

Claims

1. A bracket fixing member is characterized by comprising:

a cylindrical or arc-shaped base member;

a bracket provided with a fixing part and an arc-shaped part;

the fixing portions are provided in plural in the circumferential direction of the base member, are disposed so as to overlap with the outer peripheral side of the base member, and are fixed to the base member by resistance welding,

the arcuate portion is formed such that a curvature of a circumferential outer portion is expanded in an outer diameter direction at least more than a curvature between the plurality of fixing portions.

2. The bracket fixing part of claim 1, wherein,

the circumferential outer portion of the bracket is separated from the base member.

3. A damper having a cylindrical cylinder, comprising:

A first bracket formed by molding a plate material so as to cover at least a part of the outer peripheral side of the cylinder, and fixed to the cylinder;

a second bracket;

the second bracket includes:

a holding portion that holds other members;

a plurality of fixing portions provided in a circumferential direction of a base member constituted by the cylinder or the first bracket;

an arc-shaped portion formed such that a curvature of a circumferential outer portion is expanded in an outer diameter direction at least more than a curvature between the plurality of fixing portions;

the fixing portion is disposed so as to overlap with the outer peripheral side of the base member, and is fixed to the base member by resistance welding.

4. The buffer of claim 3,

the circumferential outer portion of the second bracket is separated from the base member.

5. A method for manufacturing a damper having a cylindrical cylinder, the method comprising:

a step of preparing a first bracket and a second bracket, wherein at least a part of the first bracket is formed in an arc shape, and the second bracket comprises: a plurality of protruding portions, at least a part of which is a first arc-shaped portion formed in an arc shape, protruding toward an inner peripheral side of the first arc-shaped portion; a second arcuate portion located outside the first arcuate portion in the circumferential direction and formed in an arcuate shape so as to extend in the outer radial direction than the first arcuate portion;

A step of fixing the first bracket to the cylinder;

a step of disposing the second bracket so that the protruding portion is brought into contact with an outer periphery of a base member constituted by the cylinder or the first bracket;

and a step of performing resistance welding by energizing a current between the base member and the protruding portion.