JP3695726B2 - Connecting structure of stabilizer bracket to hydraulic shock absorber - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic shock absorber mounted between a left and right wheel and a vehicle body in a suspension system of an automobile, and more specifically, a stabilizer bracket for connecting a stabilizer that suppresses the left and right wheels from moving in opposite phases to a hydraulic shock absorber. The present invention relates to a coupling structure to a hydraulic shock absorber.
[0002]
[Prior art]
A configuration as shown in FIG. 4 is known as a hydraulic shock absorber equipped with all components such as a suspension spring.
That is, the stabilizer bracket 9, the spring seat 10, and the knuckle bracket 11 are fixed to the outer periphery of the outer shell 8 of the hydraulic shock absorber SA by welding or the like.
[0003]
A U-shaped stabilizer (not shown) is connected to the connecting hole 9A via a rubber bushing to the stabilizer bracket 9 of the left and right hydraulic shock absorbers SA attached between the wheel and the vehicle body, and the left and right wheels move in opposite phases. To improve the ride comfort.
A suspension spring 24 is seated on the spring seat 10 via a rubber sheet 23, and the upper end of the suspension spring 24 is supported by the upper spring seat 26 on the small diameter portion of the piston rod upper end via a cushioning seat 25.
[0004]
An insulator 28 is assembled to the small diameter portion of the upper end of the piston rod, and is coupled by an insulator fastening nut 29. A thrust bearing 27 is disposed on the lower surface of the inner cylinder 28C of the insulator 28, and receives the elastic force of the suspension spring 24 through a plate 26A integrally connected to the upper spring seat 26. The mounting bolt 28A held by the outer cylinder 28B of the insulator 28 is used for mounting to the vehicle body.
Further, a cushion rubber 21 that absorbs an impact when the hydraulic shock absorber SA is compressed is supported on the upper portion of the piston rod, and a base end portion of the boot 22 is secured to an upper end thereof.
[0005]
On the other hand, inside the hydraulic shock absorber SA, on the stopper 6 fixed to a predetermined position of the piston rod 1 by spot welding or the like, the hardness of NBR, synthetic rubber or the like is low in order to reduce the impact at the time of stretching. A rebound cushion 5 made of rubber is incorporated, and is in contact with the rod guide 4 fixedly assembled on the outer shell 8 side under the elastic force of the suspension spring 24.
[0006]
The stabilizer bracket 9 that connects the stabilizer that suppresses the left and right wheels to move in the opposite phase to the hydraulic shock absorber via the rubber bush is rotated greatly through the connection hole 9A when the left and right wheels move in the opposite phase. Since a moment is applied, the stabilizer bracket 9 is firmly welded to the outer surface of the outer shell 8 by continuous fillet welding 9B or the like so that it can withstand this rotational moment.
[0007]
[Problems to be solved by the invention]
As described above, the stabilizer bracket 9 attached to the hydraulic shock absorber having the conventional structure is welded to the outer surface of the outer shell by the continuous fillet weld 9B or the like in both the upper and lower sides. Therefore, the outer shell 8 in this portion is annealed by welding heat, the mechanical strength of the outer shell original pipe is locally reduced, and the outer shell 8 is bent based on the ground load of the wheel attached via the knuckle bracket 11. The durability of the outer shell may decrease with respect to the moment.
Furthermore, in the case of fillet welding, since there are many management items such as the welding rod feed speed, the angle and gap of the welding rod with respect to the stabilizer bracket 9, and the welding current, it is difficult to control the quality of the welded part and the welding time is long. Costs also increase.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hydraulic shock absorber for a stabilizer bracket in which the durability of the outer shell does not decrease with respect to a bending moment based on a wheel ground load. Providing a coupling structure to the vessel.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the means adopted by the present invention is a hydraulic shock absorber provided with a stabilizer bracket for connecting a stabilizer for suppressing the left and right wheels from moving in opposite phases, and attached between the left and right wheels and the vehicle body. , When projecting at least four hook-shaped protrusions on the lower surface of the stabilizer bracket from the joint surface with the outer shell of the hydraulic shock absorber toward the outer shell, and welding the hook-shaped protrusions to the outer shell, Two of them are welded on a generatrix passing through the center of the knuckle support part of the knuckle bracket on a generatrix at the center of the outer surface of the outer shell that intersects the plane orthogonal to the axis of the outer shell.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a structure for connecting a stabilizer bracket to a hydraulic shock absorber according to the present invention will be described with reference to the drawings. In this case, an embodiment corresponding to the invention of claim 1 is shown in FIG. 2, but a reference example which is common in that four projections are provided is shown in FIGS. 1 and 3 as another embodiment. Show. Since the basic configuration is shown in FIG . 1, the first embodiment shown in FIG. 1 in which the vicinity of the stabilizer bracket near the lower part of the hydraulic shock absorber is enlarged will be described first. The same component numbers are used for the same constituent elements as in the prior art, and detailed description of their functions is omitted.
[0010]
A large rotating moment is applied to the stabilizer bracket 19 coupled to the outer surface of the outer shell so as to be separated from the outer shell 8 when the left and right wheels move in opposite phases.
In the case of the prior art, as shown in FIG. 4, the upper and lower ends of the stabilizer bracket 9 are welded to the outer surface of the outer shell by continuous fillet welding 9B or the like, but the rotational moment is applied to the welded portion 9B of the stabilizer bracket. Although acting in the direction of shearing and separating, it hardly acts in the direction of peeling the stabilizer bracket 9 from the outer shell 8.
For this reason, the welding of a stabilizer bracket should just endure the shearing of the welding part based on the input moment from a stabilizer.
[0011]
The first embodiment shown in FIG. 1 shows a coupling structure improved by paying attention to the above action. In other words, at least four hook-shaped protrusions 19B project from the lower surface of the surface of the stabilizer bracket to the outer shell toward the outer shell and are seated at a predetermined position on the outer shell 8, so that the short between them is short. They are connected by so-called projection welding in which a large current is passed over time and the projections are welded to the outer shell 8.
[0012]
According to this welding method, since the current can be concentrated on the protruding portion, the welding can be performed in a short time, and the heat generation at the welding portion can be minimized, so that the mechanical strength of the outer shell original pipe can be reduced. In addition to a small decrease, the heat affected range can be limited to a narrow range around the welded portion.
As a result, even if a bending moment is applied to the outer shell 8 via the knuckle bracket 11, the heat affected range is not continuous. Therefore, most of the bending moment based on the wheel ground load excludes the heat affected range. The original pipe portion bears, and the durability of the outer shell 8 is hardly lowered.
[0013]
By the way, assuming that the safety factor of the projection weld is F, the shearing force per point is F, the radius of the concentric circle passing through the tip of the projection is R, and the number of projections is N, the input moment M from the stabilizer that can withstand is , Approximately M = N · F · R.
Actually, since the input moment is determined first, N, F, and R are set so as to withstand this. In order to facilitate understanding of the above formula, the shearing force F is constant and the tips of the protrusions are arranged concentrically. However, the shearing force F does not necessarily have to be constant. The shearing force of the protrusion closer to the connecting portion may be increased. When the number N of projections is large, it is not necessary to force the tips of the projections and arrange them concentrically, and they may be arranged so as to effectively withstand the input moment M from the stabilizer.
[0014]
For the bending moment, as shown in FIG. 2, the generatrix at the center of the outer surface of the outer shell intersects with the plane perpendicular to the diameter line YY passing through the center of the knuckle support 11A of the knuckle bracket 11 through the axis of the outer shell. Since (XX in FIG. 2B) is a neutral surface, the bending moment based on the ground contact load of the wheel does not act on this bus bar, so at least two of the hook-shaped protrusions 29B are By arranging on the bus bar, the durability of the outer shell 8 against the bending moment can be further improved.
[0015]
As an effect accompanying projection welding, since the welded portion is hidden behind the joint surface between the stabilizer bracket and the outer shell 8, coating after welding is easier than the fillet weld, and the appearance is beautiful.
[0016]
Although the structure in which the flange-like protrusion 19B or 29B is provided and welded on the lower surface of the stabilizer bracket has been described above, the welding protrusion is not limited to the flange-like shape, and in accordance with JIS1196 as in the second embodiment shown in FIG. Protrusions 39B having a shape similar to the welding protrusion of the specified welding nut may be formed at the four corners of the joint surface of the stabilizer bracket to the outer shell 8 and welded to the outer surface of the outer shell 8. In this case, the radius Ra of the concentric circle passing through the welded portion can be made larger than that in the first embodiment. Input moment increases.
[0017]
【The invention's effect】
According to the invention of claim 1 , since at least four hook-shaped protrusions 29B protrude from the lower surface of the stabilizer bracket 29 toward the outer shell 8 and are welded to the outer surface of the outer shell by projection welding, Therefore, the mechanical strength of the outer shell original pipe is hardly lowered, and the durability against the bending moment based on the ground contact load of the wheel can be hardly lowered. Furthermore, since the welded portion is hidden behind the joint surface between the stabilizer bracket 29 and the outer shell 8, coating after welding is easier than in fillet welding, and the appearance can be made beautiful.
In addition, two of the hook-shaped protrusions were welded on the generatrix passing through the center of the knuckle support part of the knuckle bracket on the generatrix of the outer shell center of the outer shell that intersects the plane perpendicular to the axis of the outer shell. Therefore, the durability of the outer shell against the bending moment can be further improved since the bending moment based on the wheel contact load does not act on this bus.
[Brief description of the drawings]
FIG. 1B is an enlarged view of a lower part of a hydraulic shock absorber according to a first embodiment of the present invention.
(A) It is a ZZ arrow line view of the hydraulic shock absorber concerning a 1st embodiment.
FIG. 2B is another arrangement example of the welding hook-shaped projections according to the first embodiment.
(A) It is a ZZ arrow line view of the hydraulic shock absorber concerning other examples of arrangement of a saddle-like projection for welding.
FIG. 3B is an enlarged view of the lower part of the hydraulic shock absorber according to the second embodiment of the present invention.
(A) It is a ZZ arrow line view of the hydraulic shock absorber concerning a 2nd embodiment.
FIG. 4 is an overall view of a hydraulic shock absorber according to the prior art.
[Explanation of symbols]
SA Hydraulic shock absorber 8 Outer shells 19, 29, 39 Stabilizer brackets 19B, 29B Hook-shaped projections 39B Welding projections

Claims (1)

In the hydraulic shock absorber that is attached between the left and right wheels and the vehicle body, and that is connected to the lower shell of the stabilizer bracket and the outer shell of the hydraulic shock absorber, the stabilizer bracket is connected to a stabilizer bracket that suppresses the left and right wheels from moving in opposite phases. When projecting at least four hook-shaped protrusions from the outer shell to the outer shell and welding the hook-shaped protrusions to the outer shell, two of the hook-shaped protrusions have a diameter passing through the center of the knuckle support portion of the knuckle bracket. A structure for connecting a stabilizer bracket to a hydraulic shock absorber, characterized in that the stabilizer bracket is welded onto a generatrix at the center of the outer surface of the outer shell that intersects a plane orthogonal to the wire through the axis of the outer shell .

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