JPS5834243A - Stabilizer - Google Patents

Abstract

PURPOSE:To enable an arm to be welded integrally and easily produced with sufficient resistance to bending fatigue in a stabilizer used for vehicles or the like by dividing a portion of the arm connected to a main body receiving torsional moment. CONSTITUTION:When a stabilizer 2 is constituted from a main body 2a and arms 2b connected to both ends of said body 2a and having eye ends 2d on the ends respectively, a portion of the arm 2b is divided and the divided portions are welded w to each other to unify the arm 2b. Then the welds w are located between the eye end 2d and a position in which the ratio of bending fatigue strength of base metal of the stabilizer 2 to that of the weld w becomes equal to the ratio of bending stress sigma in a bend 2c to that in the weld w. Namely when the diameter of material of the bend 2c is equal to that of the weld w, the weld w is set to a position which meets sigmaw/sigma<=0.76.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stabilizer used in vehicles, etc., and in particular, a stabilizer that has a part of the arm part divided and welded into one piece, and has sufficient bending fatigue strength while being easy to manufacture. This invention relates to a stabilizer that is easier to use.

As shown in FIGS. 1 and 2, the conventional stabilizer 1 is made of a single piece of material with a length of about 1.5 to 4 m, and has a main body part 1a.
, since the arm portion 1b and the bent portion 1c were bent,
When the eyepiece part 1d is made by forging, especially die forging, a very large die is required), and swaging forging is generally used, which has the drawback of poor processing accuracy.

・Additionally, since the heating during forging of the material is partial heating, there is a drawback that forging cracks will occur if the non-forged parts are not sufficiently heated. Furthermore, because the stabilizer is large, machining of the centerpiece 1a (D) requires a special machine because it cannot be machined with a normal machine, and the material is long, which causes great fatigue for the worker.

The present invention has been made to eliminate the drawbacks of the prior art described above, and its purpose is to shorten the material used by dividing a part of the arm of the stabilizer into a core part. The purpose is to facilitate manufacturing, reduce worker fatigue, and reduce manufacturing costs. Another purpose is to improve processing accuracy by making it possible to process each part separately, to enable the use of small processing machines, and to prevent forging cracks by eliminating the need for partial heating during forging.

Another purpose is to determine the position of the weld by considering the bending fatigue strength of the base material and the bending fatigue strength of the weld.
It is achieved by making the bending fatigue strength of the welded part sufficiently large. A further object is to enable the use of different materials or materials with different diameters at the welding area, and to change the spring characteristics of the stabilizer.
This also aims to improve ride comfort in terms of vehicle width.

In short, the present invention includes a main body that can receive a screw moment,
The stabilizer includes a part 19 for connecting an arm part receiving a moment with the main body part, and a mounting eye part, and a weld part is provided in a part of the arm part, and the weld part is attached to the stabilizer part. Provided between a position such that the ratio of the bending fatigue strength of the base material and the bending fatigue strength of the welded part is equal to the ratio of the bending stress in the 19th part to the bending stress in the welded part and the eyepiece part. It is characterized by the fact that

The present invention will be explained below based on embodiments shown in the drawings. Third
4, the results of an experimental comparison of the bending fatigue strength of the welded portion W provided on the arm portion 2b of the stabilizer 2 will be explained. As shown in FIG.

When the bent part 2c and the welded part Wt are fixed, and a repeated load is applied to the eyelet part 2d, when the same stress amplitude is applied, the fatigue strength of the base metal naturally exceeds the fatigue strength of the welded part W. Ta. That is, when the same stress amplitude was applied, the number of load repetitions N until fatigue failure occurred was greater in the base material and less in the welded part. Therefore, we conducted an experiment by reducing the bending stress σW acting on the weld W until the number of load repetitions leading to fatigue failure became equal in the base metal and the weld, and found that the bending stress σ in the base metal It was found that the number of repetitions N required to reach fatigue failure becomes equal at a certain rate. To explain the relationship between σ and σ based on the diagram shown in Figure 4, bending stress σ in the base material
In the range where point A is larger than point A, the relationship σw = 0.760 + 2.5 holds true, and in the range from 0 = 0 to A, it is sufficient to add a correction coefficient (1-e-φ0) to Mori and Tore, It was found that aw=o, 76a+2.5 (1-e″″M10) holds true in the entire range.

Therefore, it was found that if the weld W is provided at a position that satisfies σW≦0.76σ+2.5 (1-C-071 (1)), the bending fatigue strength of the weld W can be treated as equivalent to that of the base metal.

Therefore, in FIG. 3, if the distance from the center of the main body part 2a of the stabilizer 2 riser 2, that is, the 19 part 2C, to the center 2e of the eye part 2d is 8LW from the t1 welding part W to the center 2et of the eye part 2d, then If the bending stress σ that acts on the curved part 2C of the material is σW, and the bending stress that acts on the weld W is σW, then the relationship σ/σw = t/1w holds, so the bending stress σW in the weld W
In order to reduce this, it is sufficient to shorten the position of the weld W, that is, the distance tw from the center 2e of the eyeball part 2d, and as a result, ty≦0.76t+2.5 (1-e-4/1')
The distance and tw should be determined so as to satisfy the following.

Furthermore, considering the above relationship from the practical strength when the stabilizer 20 is attached to a vehicle, the number of load repetitions that the stabilizer 2 receives during actual driving of the vehicle is the number of load repetitions per unit traveling distance. Considering this and adopting a value on the safe side, welding part 2 should be provided at a position that satisfies σW/C≦0.76.

In other words, the welded part W is made such that the ratio of the bending fatigue strength of the base material of the stabilizer 2 is equal to the ratio σW/σ of the bending stress σ in the υ part 2c and the bending stress σW in the welded part W. If it is provided between the position and the eyeball part 2d, the welding part W
will provide sufficient bending fatigue strength.

The stabilizer 2 iser 2 shown in FIG.
The distance tw from the center 2e is tw = 0.761. Therefore, if the bending stress generated in the curved part 2c connecting the main body part 2a and the arm part 2b is σ, the bending stress σW in the welded part W is σw=0.7
6σ, it has the same bending fatigue strength as the curved υ portion 2C made of the welded portion wd base material.

Further, the stabilizer 3 shown in FIG. 6 has a welded portion W provided at the base of the eye portion 3d, and this position is naturally located at the distance t above.
If the condition of y≦0.76t is satisfied, this is the highlight part 3.
This is intended to facilitate the processing of d.

Note that the above configuration is applied when both sides of the welded portion W are made of the same type of metal and have the same diameter.

Next, when steels with different compositions were used on both sides of the weld W, the experiment revealed that the ratio of the bending fatigue strength of the base metal to the bending fatigue strength of the weld W was 0.38. So, the song υ
Assuming that the bending stress in the parts 2c and 3c is σ, and the bending stress in the weld W is σW, it is necessary to provide the weld W at a position that satisfies σW≦0.38σ.

Therefore, in the case of dissimilar metals, the position of the weld W is tw
It is necessary to set it to satisfy ≦0.381.

Next, the stabilizer 4 shown in FIG. 7 is provided with welded portions wi and wi at two locations on the -arm portion 4b, and the welded portion Wl.

An arm member 5 having a diameter different from that of the main body portion 4a and the curved portion 4C is arranged between W2, so that the spring constant of the stabilizer 2 riser 4 can be changed.

In the figure, 4e is the center of the eyeball part 4d, zvtrt.

Tw! , t are the welding parts Wl, WZ, from the center 4e, respectively.
This is the distance to the curved part 4C.

In this specification, welding at the welding part W means:
It includes electric resistance welding, fusion welding such as arc welding, pressure welding such as friction welding, and all welding methods in a broad sense.

Further, stabilizers are usually heat treated, but heat treatment can be performed either before or after welding.

The present invention is constructed as described above, and its operation will be explained below. In the embodiment shown in FIG. 5, in order to manufacture the stabilizer 2, the main body part 2a and the curved part 2C are
are integrally formed by means such as die forging, and the arm portion 2b and the eyeball portion 2 are formed.
A member consisting of d and d may be separately produced by die forging and machining of the eye portion 2d, and these may be welded at the welding portion W. In this case, the machining of the eyeball portion 2d is performed on the arm portion 2.
Since it is only necessary to handle only the part b and the eyeball part 2d, the work is extremely facilitated and the machining accuracy is also improved. The same can be said of the main body portion 2a and the curved portion 2C, and the forging work is also easy.

In addition, regarding the fatigue strength in the case of being defeated by a vehicle,
Since the weld W is provided at a position where Lw = 0.761, the bending stress σW at the weld W is 0.76 tl with respect to the bending stress σ at the bend 2C, which is 76% of the maximum bending stress. Since only a bending stress of do not have.

Next, in the embodiment shown in FIG. 6, only the centerpiece 3d of the stabilizer 3 is molded as a separate member from a steel pipe or a general bearing material, and then welded to the arm 3b. It becomes possible to facilitate processing, improve processing accuracy, and use small processing machines. Regarding the bending strength of the weld W, since the distance tw is very short, the bending stress σW is almost 0 compared to σ, so there is no problem at all.

Finally, in the embodiment shown in FIG. 7, the arm portion 4b of the stabilizer 4 is partially integrated with a curved portion 4C made of the same base material as the main body portion 4a, and the other portion is formed by an arm member 5 having a small diameter. LW''=
Since the distances t and twi are set to 0.761, there is no problem with bending fatigue strength, and the spring characteristics such as the spring constant can be changed, making it possible to improve the ride of the vehicle, which was not possible with the conventional stabilizer 1. It is also possible to improve comfort by using the stabilizer 4. Furthermore, since each part is divided into parts, it is easy to process, and it is also possible to use a small processing machine.

Furthermore, in each of the embodiments shown in FIGS. 5 to 7, when the stabilizer 2, 3, or 4 is manufactured, either the bending work or the welding work may be performed first.

Note that it is also possible to weld different metals and use them for the arm portions 2b, 3b, or 4b of the stabilizer 2, 3, or 4, but in this case, the welded portion W is provided at a position where ZW≦o, sst. It is also possible to provide a stabilizer that has no problems with strength, is lightweight, and has excellent rust prevention.

Since the present invention is constructed and operates as described above, a part of the arm of the stabilizer is divided and the parts are welded to form an integrated stabilizer, thereby reducing the amount of materials used. In addition, the following effects can be obtained: simplification of manufacturing, reduction of worker fatigue, and reduction of manufacturing costs. In addition, since each part can be processed separately, processing accuracy is improved, making it possible to use small processing machines, and eliminating the need for partial heating during forging, which has the effect of preventing forging cracks. . Furthermore, since the position of the weld is determined by considering the bending strength of the base material and the bending fatigue strength of the weld, the curve of the weld can have a sufficiently large fatigue strength. In addition, it is possible to use different materials or materials with different diameters at the welding area, and it is also possible to change the spring characteristics of the stabilizer, which has the effect of improving the ride comfort of the vehicle. In addition, by making the main body hollow, it is possible to reduce the weight, so it is possible to provide a stabilizer that is significantly superior to conventional stabilizers.

[Brief explanation of drawings]

1 and 2 relate to a conventional example, FIG. 1 is a front view of the stabilizer, FIG. 2 is a side view of the stabilizer, FIGS. 3 to 7 relate to an embodiment of the present invention, and FIG. is a plan view showing an example of an experiment on the bending fatigue strength of a welded part, and Figure 4 shows the ratio of the bending fatigue strength of the base metal to the bending fatigue strength of the welded part as the ratio of bending stress, and the horizontal axis shows the ratio of the bending stress in the base metal. A diagram showing the relationship between σ and CW, with the bending stress σ at the welded part taken on the vertical axis and the bending stress σW at the welded part on the vertical axis.
- Figure 6 is a front view of an example stabilizer in which only the eyeball part is a separate member and welded to the arm part, Figure 7 is a front view of an example stabilizer installed in a part of the arm part with arms of different diameters. FIG. 3 is a front view of an example stabilizer in which members are welded together. 2.3.4 is the stabilizer, 2a, 3a, 4a are the main body parts of the stabilizer, 2b, 3b, 4b are the arm parts, 2c
, 3c, and 4c are similarly curved portions, 2d, 3d, and 4d are similarly eye-shaped portions, and W is a welded portion. Patent applicant 1 Horikiri Spring Manufacturing Co., Ltd.

Claims (1)

[Scope of Claims] 1. A stabilizer comprising a main body receiving a screw moment, an arm receiving a bending moment, a bending part connecting the arm and the main body, and a mounting eyepiece, A welded portion is provided in a part of the arm, and the ratio of the bending fatigue strength of the base material of the stabilizer to the bending fatigue strength of the welded portion is equal to the bending stress in the curved portion and the bending stress in the welded portion. A stabilizer characterized in that the stabilizer is provided between a position where the ratio is equal to the bending stress and the eyeball portion. 2. The stabilizer according to claim 1, wherein both sides of the welded portion are made of the same polar material. 3 When the material diameters of the 9th bend and the weld are the same, and the bending stress at the bend is σ and the bending stress at the weld is σ, the position of the weld satisfies σW/σ≦0.76. 3. The stabilizer according to claim 2, wherein the stabilizer is in a position where: 4. The stabilizer according to claim 1, wherein both sides of the welded portion are made of steel of different compositions. 5 When the material diameters of the curved υ part and the welded part are the same, and the bending stress in the curved part is σ and the bending stress in the welded part is σ, the position of the welded part is σW/σ≦0.38. The stabilizer according to claim 4, characterized in that the stabilizer is in a satisfactory position. 6. The stabilizer according to claim 1, 2, or 4, wherein the material diameters on both sides of the welded portion are different.