JP2016168953A - Torsion beam-type suspension - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torsion beam-type suspension that can improve durability while securing high roll rigidity.SOLUTION: A torsion beam-type suspension 1 comprises: a torsion beam 3 arranged to extend in a vehicle width direction; a pair of trailing arms 2 connected to both end parts in a shaft direction of the torsion beam 3; and a pair of reinforcing members (a first reinforcing member 4 and a second reinforcing member 5) arranged across the torsion beam 3 and each trailing arm 2 at both end parts in the shaft direction of the torsion beam 3 and fixed by welding to the torsion beam 3 and each trailing arm 2. In the torsion beam 3, at positions in the vicinities of tip parts (an inner tip part 401 and an inner tip part 501) inside a vehicle, of the reinforcing members (the first reinforcing member 4 and the second reinforcing member 5) are provided depressed parts 34 and 35 formed by depressing an outer surface 302 of the torsion beam 3.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a torsion beam suspension.

  2. Description of the Related Art Conventionally, a torsion beam suspension including a torsion beam arranged to extend in the vehicle width direction and a pair of trailing arms connected to both axial ends of the torsion beam is known. In the torsion beam suspension having such a structure, it is difficult to ensure high roll rigidity (torsional rigidity). Therefore, a technique for improving the roll rigidity of the torsion beam suspension using a reinforcing member has been proposed (see Patent Document 1).

JP 2012-101664 A

  However, in the torsion beam type suspension of Patent Document 1, although the roll rigidity can be improved by using a reinforcing member, stress accompanying torsion of the torsion beam is concentrated on the welded portion between the torsion beam and the reinforcing member. Therefore, there are problems that the torsion beam is cracked or the reinforcing member is peeled off from the torsion beam at the location where the stress concentration occurs. As a method of solving this problem, there is a method of increasing the plate thickness of each member such as a torsion beam and a reinforcing member. However, when the thickness of the member is increased, there arises a new problem that the weight of the entire torsion beam suspension increases.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a torsion beam suspension capable of improving durability while ensuring high roll rigidity.

  The torsion beam suspension of the present invention includes a torsion beam arranged to extend in the vehicle width direction, a pair of trailing arms connected to both axial ends of the torsion beam, and both axial ends of the torsion beam. A pair of reinforcing members disposed across the torsion beam and each trailing arm and fixed to the torsion beam and each trailing arm by welding, and in the torsion beam, A recessed portion in which the inner surface or the outer surface of the torsion beam is recessed is provided at a position near the front end portion on the vehicle inner side.

  The torsion beam type suspension includes a pair of reinforcing members that are disposed across the torsion beam and each trailing arm and are fixed to the torsion beam and each trailing arm by welding. Therefore, the stress generated between the torsion beam and the trailing arm due to torsion of the torsion beam can be dispersed and relaxed by the reinforcing member. Thereby, the roll rigidity can be increased while improving the durability of the torsion beam type suspension.

  Further, in the torsion beam, a recess is provided at a position in the vicinity of the tip of each reinforcing member inside the vehicle. Here, the front end portion of the reinforcing member fixed to the torsion beam by welding is a portion where stress accompanying torsion of the torsion beam tends to concentrate. That is, the dent is provided in the vicinity of the stress concentration location. Therefore, the stress generated between the torsion beam and the reinforcing member as the torsion beam is twisted can be dispersed and relaxed by the recess. Thereby, the durability of the torsion beam type suspension can be improved.

  Further, as described above, the recess is provided in the torsion beam at a position in the vicinity of the front end portion of each reinforcing member inside the vehicle. That is, the recess is provided in a portion that has a small influence on the roll rigidity. Therefore, it is possible to suppress a decrease in roll rigidity due to the provision of the recess. Thereby, the durability can be improved while ensuring the high roll rigidity of the torsion beam type suspension. Further, the effect on the performance other than the roll rigidity due to the provision of the recess is small, and the problem of weight increase does not occur.

  Thus, according to the present invention, it is possible to provide a torsion beam suspension capable of improving durability while ensuring high roll rigidity. That is, it is possible to provide a torsion beam suspension that achieves both roll rigidity and durability.

  In the torsion beam suspension, the hollow portion may have a portion that is present on the vehicle inner side of the vehicle inner end of the reinforcing member. In this case, the effect of dispersing and relaxing the stress accompanying torsion of the torsion beam by the depression can be more reliably exhibited.

  The torsion beam may be opened in a predetermined direction, and the recess may be provided on a portion of the torsion beam opposite to the opening side. In this case, the influence on roll rigidity (reduction in roll rigidity) due to the provision of the recess can be further reduced.

1 is a plan view showing a torsion beam suspension according to a first embodiment. FIG. 3 is a plan view showing a right side portion of the torsion beam suspension according to the first embodiment. FIG. 3 is a perspective view showing a right side portion of the torsion beam suspension according to the first embodiment. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is the VI-VI sectional view taken on the line of FIG. It is sectional drawing of the torsion beam of other embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
As shown in FIGS. 1 to 6, the torsion beam suspension 1 includes a torsion beam 3 disposed so as to extend in the vehicle width direction, a pair of trailing arms 2 coupled to both ends in the axial direction of the torsion beam 3, and A pair of reinforcing members (first reinforcements) arranged at both ends in the axial direction of the torsion beam 3 so as to straddle the torsion beam 3 and each trailing arm 2 and fixed to the torsion beam 3 and each trailing arm 2 by welding. And a member 4 and a second reinforcing member 5).

  In the torsion beam 3, the outer surface 302 of the torsion beam 3 is recessed at a position in the vicinity of the vehicle inner tip (inner tip 401, inner tip 501) of each reinforcing member (first reinforcing member 4, second reinforcing member 5). Indented portions 34 and 35 are provided. Hereinafter, the torsion beam suspension 1 will be described in detail.

  As shown in FIG. 1, the torsion beam suspension 1 of the present embodiment has a left-right symmetrical structure between the structure of the right side portion of the vehicle and the structure of the left side portion of the vehicle. Therefore, in this embodiment, the structure of the vehicle right side portion of the torsion beam suspension 1 will be mainly described, and the description of the structure of the vehicle left side portion will be omitted as appropriate. Further, the directions shown in the drawing are merely described for convenience of explanation, and are not intended to limit the installation direction (direction with respect to the vehicle) of the torsion beam type suspension 1 or the like.

  As shown in FIG. 1, the torsion beam type suspension 1 of this embodiment includes a pair of trailing arms 2, a torsion beam 3, a pair of first reinforcing members 4, a pair of second reinforcing members 5, and the like.

  As shown in FIG. 1, the pair of trailing arms 2 are respectively disposed on the left and right sides of the vehicle. The pair of trailing arms 2 are formed symmetrically. Each trailing arm 2 has a circular cross section perpendicular to the axial direction. Each trailing arm 2 is formed by bending a hollow pipe inside.

  A cylindrical collar 21 is fixed to one end of each trailing arm 2 by welding. Each trailing arm 2 is swingably supported by a vehicle body (not shown) via a collar 21. A plate-like carrier 22 is fixed to the other end of each trailing arm 2 by welding. Each trailing arm 2 rotatably supports a wheel (not shown) via a carrier 22.

  As shown in FIGS. 1 to 3, the torsion beam 3 is arranged so as to extend in the vehicle width direction (vehicle left-right direction). The torsion beam 3 is disposed so as to connect the pair of trailing arms 2 in the vehicle width direction.

  As shown in FIG. 5, the torsion beam 3 is formed by bending a plate material. The torsion beam 3 includes an upper surface portion 31 and a pair of side surface portions 32 extending downward from both front and rear ends of the upper surface portion 31. The upper surface portion 31 is formed to be curved in a substantially arc shape in a cross section orthogonal to the axial direction of the torsion beam 3. The torsion beam 3 has a substantially U-shaped cross section perpendicular to the axial direction.

  Further, the torsion beam 3 opens in a predetermined direction in a cross section orthogonal to the axial direction. That is, the torsion beam 3 has an opening cross section. The torsion beam 3 of the present embodiment opens toward the vehicle lower side (downward). The torsion beam 3 has an opening 30 that opens toward the lower side of the vehicle (downward).

  As shown in FIG. 3, at both ends of the torsion beam 3, notch portions 33 are formed by notching the outer edge portion of the torsion beam 3. Each notch 33 is formed in a substantially arc shape along the shape of the outer surface of the trailing arm 2. Each trailing arm 2 is fixed to both ends of the torsion beam 3 by welding.

  As shown in FIGS. 1 to 3, the pair of first reinforcing members 4 are respectively disposed at both ends of the torsion beam 3. The first reinforcing member 4 is formed by pressing a plate material. The inner front end portion 401 of the first reinforcing member 4 is formed so that the width in the vehicle front-rear direction gradually decreases toward the vehicle inner side.

  As shown in FIG. 4, the first reinforcing member 4 is disposed across the torsion beam 3 and the trailing arm 2 inside the torsion beam 3. The first reinforcing member 4 is arranged so as to form an internal space together with the torsion beam 3 and the trailing arm 2. The outer edge portion of the first reinforcing member 4 is fixed to the upper surface portion 31, the pair of side surface portions 32, and the trailing arm 2 of the torsion beam 3 by welding.

  As shown in FIGS. 1 to 3, the pair of second reinforcing members 5 are respectively disposed at both ends of the torsion beam 3. The second reinforcing member 5 is formed by pressing a plate material. The inner front end portion 501 of the second reinforcing member 5 is formed so that the width in the vehicle front-rear direction gradually decreases toward the vehicle inner side. The second reinforcing member 5 is shorter in the vehicle width direction than the first reinforcing member 4 and has a smaller width in the vehicle front-rear direction.

  As shown in FIG. 4, the second reinforcing member 5 is disposed outside the torsion beam 3 and straddling the torsion beam 3 and the trailing arm 2. The second reinforcing member 5 is arranged so as to form an internal space together with the torsion beam 3 and the trailing arm 2. The outer edge portion of the second reinforcing member 5 is fixed to the upper surface portion 31 of the torsion beam 3 and the trailing arm 2 by welding.

  As shown in FIGS. 1 to 3, in the torsion beam 3, two depressions 34 are provided in the vicinity of the inner front end 401 of the first reinforcing member 4. The depression 34 is formed in an elliptical shape in plan view. The hollow portion 34 has a portion that is present on the vehicle inner side of the front end (front end position A in FIG. 2) of the first reinforcing member 4 on the vehicle inner side.

  As shown in FIG. 6, the recessed portion 34 is recessed (recessed) toward the inside of the outer surface 302 of the torsion beam 3. The inner surface 301 of the torsion beam 3 protrudes toward the inside of the torsion beam 3 at a portion where the recess 34 is provided. The depression 34 is provided in a portion of the torsion beam 3 that is opposite to the opening side (the non-opening side portion). The non-opening side portion is a portion above the intermediate position C of the torsion beam 3 in the vehicle vertical direction. The depression 34 is provided at a position (upper surface portion 31) facing the opening 30 in the torsion beam 3.

  As shown in FIGS. 1 to 3, in the torsion beam 3, two recessed portions 35 are provided at positions near the inner front end portion 501 of the second reinforcing member 5. The hollow portion 35 is formed in an elliptical shape in plan view. The hollow portion 35 has a portion that is present on the vehicle inner side than the tip of the second reinforcing member 5 on the vehicle inner side (tip position B in FIG. 2).

  The recess 35 is recessed (recessed) inward from the outer surface 302 of the torsion beam 3 in the same manner as the above-described recess 34 (see FIG. 6). The inner surface 301 of the torsion beam 3 protrudes toward the inside of the torsion beam 3 at the portion where the recess 35 is provided. The hollow portion 35 is provided in a portion of the torsion beam 3 opposite to the opening side (a portion opposite to the opening). The recessed portion 35 is provided at a position (upper surface portion 31) facing the opening 30 in the torsion beam 3.

Next, the function and effect of the torsion beam suspension 1 of this embodiment will be described.
The torsion beam type suspension 1 of the present embodiment is disposed across the torsion beam 3 and each trailing arm 2, and is paired with a pair of first reinforcing members 4 and a pair fixed to the torsion beam 3 and each trailing arm 2 by welding. The second reinforcing member 5 is provided. Therefore, the stress generated between the torsion beam 3 and the trailing arm 2 as the torsion beam 3 is twisted can be dispersed and alleviated by the first reinforcing member 4 and the second reinforcing member 5. Thereby, the roll rigidity can be increased while improving the durability of the torsion beam suspension 1.

  Further, in the torsion beam 3, two recessed portions 34 are provided in the vicinity of the inner front end portion 401 of the first reinforcing member 4. In the torsion beam 3, two recessed portions 35 are provided at positions near the inner front end portion 501 of the second reinforcing member 5. Here, the inner front end portion 401 of the first reinforcing member 4 and the inner front end portion 501 of the second reinforcing member 5 fixed to the torsion beam 3 by welding are places where stress accompanying torsion of the torsion beam 3 tends to concentrate. That is, the depressions 34 and 35 are provided in the vicinity of the stress concentration location. Therefore, the stress generated between the torsion beam 3 and the first reinforcing member 4 and the second reinforcing member 5 as the torsion beam 3 is twisted can be dispersed and alleviated by the depressions 34 and 35. Thereby, the durability of the torsion beam type suspension 1 can be improved.

  Further, as described above, the recess 34 is provided in the torsion beam 3 at a position in the vicinity of the inner front end 401 of the first reinforcing member 4. The recess 35 is provided in the torsion beam 3 at a position near the inner front end 501 of the second reinforcing member 5. That is, the dents 34 and 35 are provided in a portion having a small influence on the roll rigidity. Therefore, it is possible to suppress a decrease in roll rigidity due to the provision of the recessed portions 34 and 35. Thereby, the durability of the torsion beam type suspension 1 can be improved while ensuring high roll rigidity. In addition, the effect on the performance other than the roll rigidity due to the provision of the recessed portions 34 and 35 is small, and the problem of weight increase does not occur.

  Further, in the present embodiment, the recessed portion 34 of the torsion beam 3 has a portion that exists on the vehicle inner side than the vehicle inner front end (tip position A) of the first reinforcing member 4. The recessed portion 35 of the torsion beam 3 has a portion that is present on the vehicle inner side than the tip (tip position B) on the vehicle inner side of the second reinforcing member 5. Therefore, the effect of dispersing and relaxing the stress accompanying torsion of the torsion beam 3 by the recessed portions 34 and 35 can be more reliably exhibited.

  Further, the torsion beam 3 is opened in a predetermined direction (toward the lower side of the vehicle), and the depressions 34 and 35 are provided in a portion on the opposite side of the torsion beam 3 from the opening side (counter opening side portion). ing. Therefore, the influence on roll rigidity (reduction of roll rigidity) by providing the depressions 34 and 35 can be further reduced.

  The recesses 34 and 35 are provided at positions facing the opening 30 in the torsion beam 3. By providing the depressions 34 and 35 at a position far from the opening 30, the influence on roll rigidity (reduction in roll rigidity) due to the provision of the depressions 34 and 35 can be further reduced.

  Thus, according to the present embodiment, it is possible to provide the torsion beam suspension 1 capable of improving durability while ensuring high roll rigidity. That is, it is possible to provide the torsion beam type suspension 1 that achieves both roll rigidity and durability.

(Other embodiments)
It goes without saying that the present invention is not limited to the above-described embodiments, and can be implemented in various modes without departing from the present invention.

  (1) In the above-described embodiment, the shape of the depressions 34 and 35 is elliptical in plan view, but the shape of the depression is not limited to this, and for example, various shapes such as a circular shape and a polygonal shape are available. Various shapes are also possible.

  (2) In the above-described embodiment, the depressions 34 and 35 are the front end portions (the inner front end portion 401 and the inner front end portion) of the respective reinforcing members (the first reinforcing member 4 and the second reinforcing member 5) in the torsion beam 3. Although two portions are provided in the vicinity of the portion 501), for example, one dent portion may be provided for each reinforcing member, or three or more portions may be provided.

  (3) In the above-described embodiment, the outer surface 302 of the torsion beam 3 is recessed to form the recessed portions 34 and 35. For example, as illustrated in FIG. 7, the inner surface 301 of the torsion beam 3 is recessed to form the recessed portion. 34 may be formed. Moreover, it is good also as a structure which provides both the hollow part which hollowed the outer surface of the torsion beam, and the hollow part which hollowed the inner surface.

  (4) In the above-described embodiment, the torsion beam 3 opens toward the vehicle lower side. For example, the torsion beam 3 may open toward the vehicle front side, or may open in another direction. .

  (5) In the above-described embodiment, the torsion beam 3 has a substantially U-shaped cross section orthogonal to the axial direction. For example, the cross section orthogonal to the axial direction may be substantially V-shaped. It may be a shape.

  (6) In the above-described embodiment, the reinforcing members (the first reinforcing member 4 and the second reinforcing member 5) are provided on the inner side and the outer side of the torsion beam 3. However, for example, the reinforcing member may be provided only on the inner side of the torsion beam. Alternatively, only the first reinforcing member 4 may be provided, or the reinforcing member may be provided only outside the torsion beam (only the second reinforcing member 5 may be provided).

  (7) In the above-described embodiment, the shape of the cross section orthogonal to the axial direction of each trailing arm 2 is circular, but the shape of the cross section is not limited to this, and is, for example, elliptical or rectangular. It is good also as polygonal shapes, such as.

  (8) In the above-described embodiment, each trailing arm 2 is formed by bending a hollow pipe inside, but may be formed by other than a pipe, for example, by bending a plate material. It may be formed.

  (9) In the above-described embodiment, each trailing arm 2 is composed of one member (one component). For example, it is composed of two or more members (two or more components). Also good.

DESCRIPTION OF SYMBOLS 1 ... Torsion beam type suspension 2 ... Trailing arm 3 ... Torsion beam 301 ... Inner surface 302 ... Outer surface 34, 35 ... Depression part 4 ... 1st reinforcement member (reinforcement member)
401 ... Inner tip (tip on the inner side of the vehicle)
5 ... Second reinforcing member (reinforcing member)
501 ... Inner tip (tip inside the vehicle)

Claims (3)

A torsion beam arranged to extend in the vehicle width direction;
A pair of trailing arms connected to both axial ends of the torsion beam;
A pair of reinforcing members arranged at both ends in the axial direction of the torsion beam so as to straddle the torsion beam and the trailing arms and fixed to the torsion beam and the trailing arms by welding; ,
In the torsion beam, the torsion beam suspension is characterized in that a recess is formed by recessing an inner surface or an outer surface of the torsion beam at a position in the vicinity of the front end portion of each reinforcing member inside the vehicle.   The torsion beam suspension according to claim 1, wherein the hollow portion has a portion that is present on the vehicle inner side than a tip on the vehicle inner side of the reinforcing member.   The torsion beam suspension according to claim 1 or 2, wherein the torsion beam is opened in a predetermined direction, and the hollow portion is provided on a portion of the torsion beam opposite to the opening side. .

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