buffer

Abstract

The damper (D) of the present application is provided with: a damper main body (1) having a housing (2) and a rod member (3); and a knuckle bracket (4) mounted on the outer periphery of the lower end side of the housing (2); the knuckle bracket (4) has: a holding portion (5) which is a C-shaped tube in cross section and holds the outer periphery of the housing (2); a pair of mounting portions (6, 7) which extend mutually in parallel to the radial outer side from the circumferential both ends of the holding portion (5); reinforcing portions (8, 9) which are formed by bending the upper ends of the respective mounting portions (6, 7) in mutually approaching directions; and a C-shaped surface which is formed by the upper ends of the respective reinforcing portions (8, 9) and the upper end of the holding portion (5); and is provided with: a C-shaped welding portion (11) which is formed by welding the C-shaped surface (10) and the housing (2) in a range from a position apart from the circumferential one end of the C-shaped surface (10) through above the back of the holding portion (5) to the circumferential other end.

Description

TECHNICAL FIELD

[0001] The present application relates to a damper. BACKGROUND

[0002] A damper is provided with a housing and a rod member movably inserted into the housing, and is used, for example, assembled in a suspension of a vehicle, and exerts a damping force and suppresses vibration of a vehicle body and a wheel when a piston rod moves in an axial direction with respect to the housing and is extended and contracted.

[0003] A damper assembled in this way to a suspension, for example, in the case of a strut type suspension, is provided at a lower end of the housing with a knuckle bracket for mounting a knuckle that holds a vehicle wheel, by welding.

[0004] The knuckle bracket is provided, for example, with a cylindrical holding portion that holds an outer periphery of the housing and has a C-shaped cross section, a pair of mounting portions that extend from both ends in a peripheral direction of the holding portion to an outer side in a radial direction and are connectable to the knuckle, and a reinforcing portion that is formed by bending upper ends of the mounting portions toward each other.

[0005] The lower end of the knuckle bracket is welded to the outer periphery of the housing at the lower end together with the upper end and is integrated with the housing, but since the damper supports a load received by the wheel, it is necessary to firmly join the housing and the knuckle bracket.

[0006] Therefore, in the knuckle bracket of the conventional damper, for example, as disclosed in JP 2002-372090 A or JP 2009-216129 A, an upper end surface of the reinforcing portion and an upper end surface of the holding portion are formed as the same horizontal plane, and the upper end surface of the reinforcing portion and the upper end surface of the holding portion are welded to the outer periphery of the housing as a welding surface (for example, refer to Patent Documents 1 and 2).

[0007] In the damper configured in this way, in the knuckle bracket, the welding surface is the same horizontal plane, and therefore, when welded to the housing, molten solder is easily accumulated on the welding surface, and thus a damper that does not have a welding defect and has sufficient strength can be manufactured.

[0008] PRIOR ART DOCUMENTS

[0009] PATENT DOCUMENTS

[0010] Patent Document 1: Japanese Patent Application Publication No. 2002-372090

[0011] Patent Document 2: Japanese Patent Application Publication No. 2009-216129 SUMMARY

[0012] PROBLEMS TO BE SOLVED BY THE INVENTION

[0013] In the shock absorber configured in this way, since the housing is firmly engaged with the knuckle bracket, there is currently no particular problem in terms of use in a vehicle.

[0014] However, the vehicle weight is constantly increasing mainly due to the adjustment of the frame configuration and the like caused by the reinforcement of the automobile safety standards, the mounting of preventive safety devices, and the increase in the mounting equipment for improving comfort. Therefore, the shock absorber for the strut suspension must support the constantly increasing vehicle weight, and it is desired to further increase the engagement strength between the housing and the knuckle bracket to withstand higher loads.

[0015] Here, when the housing and the knuckle bracket are welded, they are clamped and welded in such a way that the mounting portions approach each other so that no gap is generated between the housing and the aforementioned welding surface. However, since the reinforcing portions are bent into a shape as described above, the shape is sometimes restored due to springback, and a gap is generated between the outer periphery of the housing and the both ends in the peripheral direction of the welding surface.

[0016] In this way, when a wide gap is generated between the welding surface and the housing, in the portion of the gap, the knuckle bracket and the welding material of the housing sometimes do not sufficiently fuse with the solder, thereby forming a welded portion including a bead having a relatively large proportion of solder.

[0017] Since such a welded portion is more fragile and has a reduced engagement strength compared to a welded portion formed by the sufficient fusion of the welding material, when a vibration test in which a high load is repeatedly applied is performed, the number of times desired for the shock absorber is sometimes not satisfied and a crack occurs in the welded portion.

[0018] Therefore, an object of the present application is to provide a shock absorber capable of increasing the engagement strength of the housing and the knuckle bracket and the resistance to the repeated input of a high load.

[0019] Solution for solving the problem

[0020] To solve the problem, the shock absorber of the present application is provided with: a shock absorber main body having a housing and a rod member movably inserted into the housing; and a knuckle bracket mounted on the outer periphery of the lower end side of the housing by welding; the knuckle bracket has: a holding portion having an opening on the front surface side, which is a C-shaped cylinder in cross section and holds the outer periphery of the housing; a pair of mounting portions extending from both ends in the peripheral direction of the holding portion to the radially outer side in parallel with each other and connectable to a knuckle of a vehicle; a reinforcing portion formed by bending the upper ends of the respective mounting portions in the direction in which they approach each other and holding the outer periphery of the housing together with the holding portion; and a C-shaped surface formed by the upper ends of the respective reinforcing portions and the upper end of the holding portion and welded along the outer periphery of the housing; and is provided with: a C-shaped welded portion welded between the C-shaped surface and the housing in a range from a position apart from one end in the peripheral direction of the C-shaped surface to the upper side of the back of the holding portion up to the other end in the peripheral direction.

[0021] According to the damper configured in this way, since the welding of the C-shaped surface and the housing is performed after the removal of the circumferential ends of the C-shaped surface of the knuckle bracket corresponding to the front end portion of the reinforcing portion where a gap is likely to occur with the housing, the joint strength of the welded portion between the knuckle bracket and the housing is improved, and a welded portion that is resistant to repeated input of high loads can be formed.

[0022] Further, the welded portion in the damper can also be formed by welding the C-shaped surface and the housing within a range from a position apart from the circumferential end of the C-shaped surface to a position apart from the other circumferential end, over the back portion of the holding portion. According to the damper configured in this way, since the welding of the C-shaped surface and the housing is performed after the removal of the circumferential ends of the C-shaped surface of the knuckle bracket corresponding to the front end portion of the reinforcing portion where a gap is likely to occur with the housing, the joint strength of the welded portion between the knuckle bracket and the housing is further improved, and a welded portion that is resistant to repeated input of higher loads can be formed.

[0023] Further, when the knuckle bracket is viewed from the front surface facing the mounting portion, the welded portion in the damper can be formed with a starting point at the intersection of the extension line of one mounting portion of the C-shaped surface and an ending point at the intersection of the extension line of the other mounting portion. According to the damper configured in this way, since the welded portion can be formed while avoiding the portion of the reinforcing portion that is difficult to deform, a welded portion of overall high strength can be reliably obtained, and since the welding range between the knuckle bracket and the housing can be set in advance, the welding work also becomes easy.

[0024] Effects of the Invention

[0025] The damper according to the present application can improve the joint strength of the housing and the knuckle bracket and the resistance to repeated input of high loads. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 FIG. 1 is a side view of a damper in an embodiment.

[0027] Figure 2 FIG. 2 is a front view of a knuckle bracket of the damper in the embodiment.

[0028] Figure 3 FIG. 3 is a perspective view of the knuckle bracket of the damper in the embodiment. DETAILED DESCRIPTION

[0029] Hereinafter, the present application will be described based on the embodiment shown in the drawings. As shown in FIG. 1, a damper 1 according to the present application is provided with a housing 2 and a knuckle bracket 3. Figure 1 and Figure 2As shown, the damper D is provided with a damper main body 1 having a housing 2 and a rod member 3 movably inserted into the housing 2, and a knuckle bracket 4 attached to the outer periphery of the lower end side of the housing 2 by welding. The knuckle bracket 4 is connected to a knuckle for supporting a wheel of a vehicle not shown, and is sandwiched between the vehicle body and the wheel of the vehicle.

[0030] Next, the respective parts of the damper D will be described in detail. The damper main body 1 has a cylindrical housing 2 and a rod member 3 movably inserted into the housing 2, and generates a damping force for impeding the relative movement of the rod member 3 with respect to the housing 2 when the rod member 3 is relatively moved in the axial direction with respect to the housing 2 and performs an extension and contraction operation, and attenuates the vibration of the vehicle body and the wheel.

[0031] The damper main body 1 is provided, for example, with the cylindrical housing 2 having a closed lower end, a cylinder not shown housed in the housing 2, the rod member 3 movably inserted into the cylinder, a piston connected to the rod member 3 while being inserted into the cylinder and dividing the cylinder into an extension side chamber and a compression side chamber, a reservoir formed between the cylinder and the housing, and a valve housing provided at the lower end of the cylinder and separating the compression side chamber and the reservoir. Furthermore, the extension side chamber and the compression side chamber are filled with a liquid such as hydraulic oil, and the reservoir is filled with a liquid and a gas. In addition, the liquid used in the damper D can be, for example, water, an aqueous solution, or the like, in addition to hydraulic oil.

[0032] Furthermore, a passage for communicating the extension side chamber and the compression side chamber is provided on the piston, and a damping valve is provided on a passage for communicating the compression side chamber and the reservoir. In the damper main body 1 configured in this way, the extension side chamber and the compression side chamber are expanded and contracted by the piston and the liquid is moved through the passage at the time of the extension and contraction operation, and the damping valve exerts a resistance to the flow of the liquid and generates a damping force.

[0033] In addition, a lower suspension spring bracket 12 for supporting the lower end of a suspension spring not shown is attached to the intermediate outer periphery of the housing 2. The suspension spring not shown is sandwiched between an upper suspension spring bracket attached to the front end of the rod member 3 and the lower suspension spring bracket 12, and elastically supports the vehicle body when the damper D is sandwiched between the vehicle body and the wheel.

[0034] The knuckle bracket 4 is formed by bending a piece of metal parent material. The knuckle bracket 4 has: a cylindrical holding portion 5 that holds the outer periphery of the housing 2 and has a C-shaped cross section; a pair of mounting portions 6, 7 that extend outward in the radial direction from both ends in the peripheral direction of the holding portion 5 and are parallel to each other and are connectable to a knuckle of a vehicle not shown; reinforcing portions 8, 9 that are bent in a direction in which the upper ends of the mounting portions 6, 7 approach each other and hold the outer periphery of the housing 2 together with the holding portion 5; and a C-shaped surface 10 that is formed by the upper ends of the reinforcing portions 8, 9 and the upper end of the holding portion 5 and is welded along the outer periphery of the housing 2.

[0035] As shown in Figs. 1 and 2, the holding portion 5 has a C-shaped cross section and is open on the front side. The holding portion 5 has a rectangular cutout 5a in the center of the back side as viewed from the front. Figure 1 Figure 2 The mounting portions 6, 7 are provided opposite each other at both ends in the peripheral direction of the holding portion 5 and extend outward in the radial direction of the holding portion 5 in parallel to each other. The mounting portions 6, 7 each have two bolt insertion holes 6a, 7a at positions at which the mounting portions 6, 7 can be provided opposite two holes of a mounting portion of a knuckle of a vehicle not shown. The mounting portions 6, 7 are bolted to the mounting portion of the knuckle by bolts and nuts not shown that pass through the bolt insertion holes 6a, 7a, whereby the knuckle bracket 4 can be mounted to the knuckle.

[0036] Further, the upper ends of the mounting portions 6, 7 are bent inward in the radial direction of the holding portion 5 by bending processing to form the reinforcing portions 8, 9. As shown in Figs. 1 and 2, the reinforcing portions 8, 9 are formed by bending the upper ends of the mounting portions 6, 7 inward in the radial direction of the holding portion 5 so that the upper ends of the mounting portions 6, 7 are narrowed toward the holding portion 5, i.e., inward in the radial direction of the knuckle bracket 4. The upper ends of the reinforcing portions 8, 9 and the upper end of the holding portion 5 are on the same plane and form a single surface, and hold the outer periphery of the housing 2 together with the holding portion 5. In this way, the upper ends of the reinforcing portions 8, 9 and the upper end of the holding portion 5 are on the same plane and form a single C-shaped surface, i.e., the C-shaped surface 10, along the outer periphery of the housing 2.

[0037] Further, the upper ends of the mounting portions 6, 7 are bent inward in the radial direction of the holding portion 5 by bending processing to form the reinforcing portions 8, 9. As shown in Figs. 1 and 2, the reinforcing portions 8, 9 are formed by bending the upper ends of the mounting portions 6, 7 inward in the radial direction of the holding portion 5 so that the upper ends of the mounting portions 6, 7 are narrowed toward the holding portion 5, i.e., inward in the radial direction of the knuckle bracket 4. The upper ends of the reinforcing portions 8, 9 and the upper end of the holding portion 5 are on the same plane and form a single surface, and hold the outer periphery of the housing 2 together with the holding portion 5. In this way, the upper ends of the reinforcing portions 8, 9 and the upper end of the holding portion 5 are on the same plane and form a single C-shaped surface, i.e., the C-shaped surface 10, along the outer periphery of the housing 2. Figure 1 Figure 2 Further, the upper ends of the mounting portions 6, 7 are bent inward in the radial direction of the holding portion 5 by bending processing to form the reinforcing portions 8, 9. As shown in Figs. 1 and 2, the reinforcing portions 8, 9 are formed by bending the upper ends of the mounting portions 6, 7 inward in the radial direction of the holding portion 5 so that the upper ends of the mounting portions 6, 7 are narrowed toward the holding portion 5, i.e., inward in the radial direction of the knuckle bracket 4. The upper ends of the reinforcing portions 8, 9 and the upper end of the holding portion 5 are on the same plane and form a single surface, and hold the outer periphery of the housing 2 together with the holding portion 5. In this way, the upper ends of the reinforcing portions 8, 9 and the upper end of the holding portion 5 are on the same plane and form a single C-shaped surface, i.e., the C-shaped surface 10, along the outer periphery of the housing 2.

[0038] The knuckle bracket 4 is welded to the outer periphery of the housing 2 at the upper and lower ends and is fixed to the housing 2. The lower end of the knuckle bracket 4 and the lower end of the holding portion 5 are integrally welded to the lower end of the housing 2 in the peripheral direction by arc welding.

[0039] ​​As for the upper end side of the knuckle bracket 4, the outer periphery of the housing 2 is arc welded to the C-face 10 and forms a C-shaped weld 11. As shown in FIG. 2, the weld 11 is formed by the fusion of the weld material and the solder, and is formed in a range from a position apart from one end in the circumferential direction of the C-face 10 to a position apart from the other end in the circumferential direction of the C-face 10 over the back of the holding portion 5. That is, the weld 11 is not formed at both ends in the circumferential direction of the C-face 10, and the C-face 10 is welded to the housing 2 except for the both ends. Figure 3

[0040] Specifically, in the damper D of the present embodiment, the outer diameter of the housing 2 is set to 50 mm, and the plate thickness of the knuckle bracket 4 is set to 3 mm, and the weld 11 is formed from a position apart from one end in the circumferential direction of the C-face 10 by 5 mm or more and by 10 mm or less as a starting point, over the upper end of the back of the holding portion 5, and to a position apart from the other end in the circumferential direction of the C-face 10 by 5 mm or more and by 10 mm or less as an ending point.

[0041] When the knuckle bracket 4 is welded to the housing 2, the mounting portions 6, 7 are clamped in a manner of being drawn closer to each other, and the C-face 10 of the knuckle bracket 4 is brought into close contact with the outer periphery of the housing 2, and the reinforcing portions 8, 9 provided for the purpose of improving the strength of the knuckle bracket 4 are difficult to deform. Therefore, even if the front end portions clamping the upper ends of the reinforcing portions 8, 9, that is, the mounting portions 6, 7, a gap is sometimes generated between the both end portions in the circumferential direction of the C-face 10 and the housing 2.

[0042] Even if a gap is present between the C-face 10 of the knuckle bracket 4 and the outer periphery of the housing 2, when the gap between the C-face 10 of the knuckle bracket 4 and the outer periphery of the housing 2 is sufficiently narrow, a weld in which the knuckle bracket 4 and the housing 2 as the weld material and the solder are fused can be formed at the time of welding, and when the gap is wide at both ends in the circumferential direction of the C-face 10 which is difficult to deform even if the mounting portions 6, 7 are clamped, a weld in which the weld material and the solder are fused cannot be formed.

[0043] Therefore, as in the conventional damper, when the entire C-face 10 is welded to the outer periphery of the housing 2, when a wide gap is generated between the both end portions in the circumferential direction of the C-face 10 and the outer periphery of the housing 2, a weld in which the weld material and the solder are fused, which is high in strength, cannot be formed at the portions of the weld corresponding to the both end portions in the circumferential direction of the C-face 10. That is, as in the conventional damper, when the entire C-face 10 is welded, the portions of the C-face 10 corresponding to the both end portions in the circumferential direction of the weld are formed by a weak weld, and therefore, sufficient joint strength cannot be obtained at the weld portions of the knuckle bracket 4 and the housing 2.

[0044] ​In contrast, in the damper D of the present embodiment, instead of welding the entire C-shaped surface 10, the circumferential ends of the C-shaped surface 10 of the knuckle bracket 4 corresponding to the front end portions of the reinforcing portions 8, 9 where gaps are likely to occur between the housing 2 are detached, and a welding portion 11 is formed in a range from a position apart from one circumferential end of the C-shaped surface 10 to a position apart from the other circumferential end of the C-shaped surface 10 over the back of the holding portion 5. When the welding portion 11 is formed in this manner, the welding portion 11 is formed only of a bead of high strength in which the materials to be welded of the knuckle bracket 4 and the housing 2 are sufficiently fused with the solder. Therefore, the welding length of the welding portion 11 of the damper D of the present embodiment is shorter than the welding length of the welding portion of the conventional damper in which the upper end of the knuckle bracket is welded, but the joining strength of the knuckle bracket 4 and the housing 2 of the welding portion 11 is improved, and the welding portion 11 has higher resistance to repeated input of high loads than the welding portion of the conventional damper.

[0045] Thus, the damper D of the present embodiment includes: a damper main body 1 having a housing 2 and a rod member 3 movably inserted into the housing 2; and a knuckle bracket 4 mounted on the outer periphery of the lower end side of the housing 2 by welding; the knuckle bracket 4 has: a holding portion 5 having an opening on the front side, being a C-shaped tube in cross section, and holding the outer periphery of the housing 2; a pair of mounting portions 6, 7 extending from the circumferential ends of the holding portion 5 to the radially outer side in parallel with each other, and connectable to a knuckle of a vehicle; reinforcing portions 8, 9 formed by bending the upper ends of the respective mounting portions 6, 7 toward each other, and holding the outer periphery of the housing 2 together with the holding portion 5; and a C-shaped surface formed by the upper ends of the respective reinforcing portions 8, 9 and the upper end of the holding portion 5, and welded along the outer periphery of the housing 2; and includes a C-shaped welding portion 11 in which the C-shaped surface 10 and the housing 2 are welded in a range from a position apart from one circumferential end of the C-shaped surface 10 to a position apart from the other circumferential end of the C-shaped surface 10 over the back of the holding portion 5.

[0046] According to the damper D configured in this manner, since the circumferential ends of the C-shaped surface 10 of the knuckle bracket 4 corresponding to the front end portions of the reinforcing portions 8, 9 where gaps are likely to occur between the housing 2 are detached and then welded, the joining strength between the knuckle bracket 4 and the housing 2 is improved, and the resistance to repeated input of high loads can be improved. If the damper D includes the knuckle bracket 4 having the reinforcing portions 8, 9 formed by bending the upper ends of the mounting portions 6, 7 toward each other, and if the welding portion 11 is formed in the aforementioned range,

[0047] In the portion where the gap between the C-shaped surface 10 of the steering knuckle bracket 4 and the outer periphery of the housing 2 is relatively wide, a weak weld bead is formed. As mentioned above, since the steering knuckle bracket 4 has reinforcing parts 8 and 9 provided after bending the upper ends of the mounting parts 6 and 7, the gap between the C-shaped surface 10 and the housing 2 tends to widen at both ends of the circumferential direction of the C-shaped surface 10.

[0048] Therefore, when welding the C-shaped surface 10 of the steering knuckle bracket 4 to the outer periphery of the housing 2, the distance between the start and end points of the weld portion 11 and the circumferential ends of the C-shaped surface 10 can be addressed as follows: On one circumferential end of the C-shaped surface 10, the starting point for forming the weld bead is the location where the gap between the C-shaped surface 10 and the outer periphery of the housing 2 is narrowed to the point where a high-strength weld bead can be formed; on the other circumferential end of the C-shaped surface 10, the ending point is the location before the gap between the C-shaped surface 10 and the outer periphery of the housing 2 can no longer form a high-strength weld bead. In this way, the weld length of the weld portion 11 can be maximized while simultaneously forming a weld portion 11 without any weak points. In this embodiment, the starting and ending points of the weld portion 11 are set within a range of 5 mm to 10 mm from both circumferential ends of the C-shaped surface 10 of the steering knuckle bracket 4. In the weld portion 11, for repeated input of high loads, higher durability and better joint strength than required by conventional dampers can be obtained. In this way, considering the dimensional errors of the steering knuckle bracket 4 and the springback of the material, the position of the gap that will not form a weak weld bead can be found in advance. By pre-setting the interval distance between one circumferential end of the C-shaped surface 10 and the starting point of the weld portion 11, and the interval distance between the other circumferential end of the C-shaped surface 10 and the ending point of the weld portion 11, the time for measuring the gap interval during each manufacturing process can be saved. In addition, in the buffer D of this embodiment, the interval distance between one circumferential end of the C-shaped surface 10 and the starting point of the weld portion 11, and the interval distance between the other circumferential end of the C-shaped surface 10 and the ending point of the weld portion 11 are set to the same length. However, if the finished steering knuckle bracket 4 is uneven from left to right when viewed from the front, it can be set to different lengths.

[0049] In addition, such as Figure 2 As shown, when viewing the steering knuckle bracket 4 from the front facing the mounting portions 6 and 7, the welding portion 11 is formed with the intersection of the extension line E1 of the inner side surface 6c of one mounting portion 6 of the C-shaped surface 10 and the intersection of the extension line E2 of the inner side surface 7c of the other mounting portion 7 as the starting point. As mentioned above, in order to weld the steering knuckle bracket 4 to the outer periphery of the housing 2, even if the mounting portions 6 and 7 are clamped, the reinforcing portions 8 and 9, which are obtained by bending the upper ends of the mounting portions 6 and 7, are difficult to deform, thus creating a large gap between the circumferential ends of the C-shaped surface 10 and the outer periphery of the housing 2. Because the reinforcing portions 8 and 9 are in Figure 2The inner side of the extension lines E1, E2 of the inner side surfaces 6c, 7c of the mounting portions 6, 7 is particularly strong in strength and difficult to deform, and thus, when welding is performed while avoiding this portion and the welding portion 11 is formed, a welding portion 11 of overall high strength can be reliably obtained. Further, since the positions of the inner side surfaces 6c, 7c of the mounting portions 6, 7 are obtained in accordance with the design values of the knuckle bracket 4, the welding range of the knuckle bracket 4 and the housing 2 can be set in advance, and thus, the welding work also becomes easy.

[0050] Further, as described above, the welding portion 11 is formed in a range from a position apart from one end of the circumference of the C-shaped surface 10 to a position apart from the other end of the circumference of the C-shaped surface 10, passing above the back of the holding portion 5. However, even if the welding portion 11 is formed in a range from a position apart from one end of the circumference of the C-shaped surface 10 to the other end of the circumference of the C-shaped surface 10, passing above the back of the holding portion 5, the improvement in welding strength can be achieved on the one end side of the C-shaped surface 10, and thus, the welding portion 11 can also be formed in a range from a position apart from one end of the circumference of the C-shaped surface 10 to the other end of the circumference of the C-shaped surface 10, passing above the back of the holding portion 5. Thus, if the welding portion 11 is formed in a range from a position apart from one end of the circumference of the C-shaped surface 10 to a position apart from the other end of the circumference of the C-shaped surface 10, passing above the back of the holding portion 5, a welding strength higher than that of the welding portion of the conventional damper and higher durability can be obtained.

[0051] However, in order to further improve the welding strength and obtain a welding portion 11 having durability against repeated input of higher loads, it is preferable that the welding portion 11 be formed in a range from a position apart from one end of the circumference of the C-shaped surface 10 to a position apart from the other end of the circumference of the C-shaped surface 10, passing above the back of the holding portion 5.

[0052] Further, the welding portion 11 can be formed in a plurality of portions in a range from a position apart from one end of the circumference of the C-shaped surface 10 to the other end of the circumference of the C-shaped surface 10, passing above the back of the holding portion 5, rather than being continuously formed without interruption, and thus, the welding portion 11 can also be formed in a plurality of portions, which is the same as the case where the welding portion 11 is formed in a range from a position apart from one end of the circumference of the C-shaped surface 10 to a position apart from the other end of the circumference of the C-shaped surface 10, passing above the back of the holding portion 5.

[0053] The preferred embodiments of the present application have been described in detail above, but modifications, alterations, and changes can be made thereto without departing from the scope of the claims.

[0054] Symbol Explanation

[0055] 1 buffer body

[0056] 2 housing

[0057] 3 lever

[0058] 4 knuckle bracket

[0059] 5 holding portion

[0060] 6, 7 mounting portion

[0061] 6c, 7c inner side surface of mounting portion

[0062] 8, 9 reinforcing portion

[0063] 10 C-shaped surface

[0064] 11 welding portion

[0065] E1, E2 extension line

[0066] D buffer

Claims

1. A buffer, in, The buffer has the following features: The buffer body has a housing and a rod that can be movably inserted into the housing; And a steering knuckle bracket, which is mounted on the outer periphery of the lower end side of the housing by welding; The steering knuckle bracket has: a holding portion having an opening on its front side, which is a C-shaped cylindrical section that holds the outer periphery of the housing; a pair of mounting portions extending radially outward from both circumferential ends of the holding portion and parallel to each other, and which can be connected to the steering knuckle of the vehicle; a reinforcing portion formed by bending the upper ends of each of the mounting portions toward each other and holding the outer periphery of the housing together with the holding portion; and a C-shaped surface formed by the upper ends of each of the reinforcing portions and the upper ends of the holding portions on the upper end side of the steering knuckle bracket and welded along the outer periphery of the housing; It also includes: a C-shaped welding part, which is formed by welding the C-shaped surface and the outer shell from a position away from one circumferential end of the C-shaped surface, through the back of the holding part, to the other circumferential end.

2. The buffer according to claim 1, in, In the buffer, The welded portion is formed by welding the C-shaped surface and the outer shell within a range from one circumferential end away from the C-shaped surface, through the back of the holding portion, to the other circumferential end.

3. The buffer according to claim 2, in, In the buffer, Viewed from the front side opposite the mounting portion, the steering knuckle bracket is formed with the intersection of the extension line of one side of the mounting portion on the C-shaped surface as the starting point and the intersection of the extension line of the other side of the mounting portion as the ending point.

4. The buffer according to claim 2, in, In the buffer, The gap between the C-shaped surface and the outer shell is wider at both ends of the circumferential direction of the C-shaped surface than it is at the ends of the circumferential direction from one end of the C-shaped surface away from the C-shaped surface, across the back of the holding part, to the other end of the circumferential direction.

5. The buffer according to claim 1, in, In the buffer, The welding part is formed by welding the C-shaped surface and the outer shell within a range from a position 5 mm to 10 mm away from one circumferential end of the C-shaped surface, passing over the back of the holding part, to a position 5 mm to 10 mm away from the other circumferential end.

Images