JP4924102B2 - Torsion beam suspension - Google Patents

Description

  The present invention relates to a torsion beam suspension technology, and more particularly to a structure for fixing a vehicle body attachment member for attaching a torsion beam to a vehicle body with respect to the torsion beam.

  Conventionally, there are documents that disclose torsion beam type suspensions, and various techniques relating to torsion beam type suspensions are known (for example, see Patent Document 1).

  The torsion beam suspension disclosed in Patent Document 1 includes a torsion beam and a vehicle body attachment member for attaching the torsion beam to the vehicle body side. The torsion beam is constituted by a single tubular member including a transverse part extending in the vehicle body width direction of the vehicle and an arm part extending in the vehicle body length direction from both ends of the transverse part via bending parts. Moreover, the said vehicle body attachment member is each fixed to the said bending part.

  An axle is attached to the end of the arm portion. On the other hand, a cylindrical bush portion is provided at the front end of the vehicle body attachment member, and is attached to the vehicle body side shaft member so as to be rotatable.

  And in the above structures, as shown in FIG.11 and FIG.12, fixing of the vehicle body attachment member 72 with respect to the bending part 71 of the torsion beam 70 is conventionally performed by welding. In this welding, from the viewpoint of securing the mounting strength, each of the surface portions 72a, 72b, 72b, 72b The welding is performed so as to surround the joint portions 73a, 73b, and 73c with respect to the bent portion 71 of 72c.

  However, in the case of such a welded structure, as shown in FIG. 11 and FIG. 12, the gap adjustment at the joints 73 a, 73 b, and 73 c of the bending portion 71 and the vehicle body attachment member 72, and the axle from the bush portion 75 attached to the vehicle body side It is necessary to simultaneously satisfy the three items of obtaining dimensional accuracy up to 76 (FIG. 11; dimension D) and welding bead position accuracy, which complicates the process of obtaining product dimensions and welding quality accuracy. In addition, due to this, there is a problem that cost is required to ensure quality, and that defective products and welding rework are likely to occur.

  In addition, as shown in FIG. 12, in welding of the joint portions 73a, 73b, and 73c, in order to prevent welding failure caused by drooping of the weld bead due to gravity, the torsion beam 1 and the vehicle body mounting member 72 are sequentially rotated, It was necessary to arrange each surface part 72a * 72b * 72c on the upper side, and the welding process needed three processes in total. Although it is possible to perform welding by appropriately operating the welding apparatus without rotating the torsion beam 1 and the vehicle body mounting member 72, a three-dimensional complicated operation is required for the welding apparatus. In particular, the welding of the joint portion 73b of the vertical surface constituting portion 72b, which needs to consider the drooping of the weld bead, is a complicated process.

Here, if welding in the range of the joint portion 73b of the vertical surface constituting portion 72b can be omitted, the welding process can be made into two steps. However, as shown in FIG. 13, when considering the loads F1, F2,... Transmitted from the vertical surface constituting portion 72b to the bending portion 71, if the welding of the vertical surface constituting portion 72b is omitted, Load F1, F2,... Are supported by the welded portion of the upper surface portion 72a and the lower surface portion 72c, the stress inherent in the vertical surface component portion 72b is the boundary between the vertical surface component portion 72b and the upper surface portion 72a. 74a and the boundary portion 74b between the vertical surface constituting portion 72b and the lower surface portion 72c are concentrated (concentration of loads F1 and F3, concentration of loads F2 and F4), resulting in a design problem in mechanical strength. It will be. That is, sufficient strength and rigidity cannot be ensured.
JP 2000-318420 A

  Accordingly, in view of the above problems, the present invention proposes a torsion beam suspension having a novel configuration that facilitates positioning of the vehicle body mounting member and enables the welding process to be reduced.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, as described in claim 1,
A torsion beam in which arm parts are formed by bending both ends of the pipe material;
A vehicle body attachment member that is welded to a bending portion formed by the bending process and connects the torsion beam to the vehicle body side, and
The vehicle body mounting member is
A base portion constituting a portion to be welded to the bent portion of the torsion beam;
A link portion that constitutes a portion extending from the base portion toward the front in the vehicle length direction, and
The base portion includes an extending portion that extends from the boundary portion between the base portion and the link portion on the vehicle outer side to the vehicle outer side,
Among the joints to the bent part of the base, welding is performed for each of the upper joint that is the upper side in the state where the torsion beam is installed in the vehicle, and the lower joint that is the lower side ,
By providing a rear extension portion extending in a direction opposite to the extension direction of the link portion at both end portions of the upper joint portion of the base portion and / or both end portions of the lower joint portion, The upper joint portion and / or the lower joint portion is formed in a substantially U shape that is open in the rear in the vehicle length direction in a plan view, and the rear extension portion is an outer peripheral upper surface configuration range of the bent portion, and / or or Ru is welded to the outer peripheral lower surface configuration range, it is an torsion beam suspension.

Moreover, as described in claim 2,
The base portion includes an extending portion that extends from the boundary portion between the base portion and the link portion on the inner side of the vehicle to the inner side of the vehicle .

Moreover, as described in claim 3,
In the state before the welding, the upper joint and the lower joint are attached to the outer peripheral upper surface configuration range and the outer peripheral lower surface configuration range of the bent portion, respectively, A gap is formed between the vertical surface constituent portion and the front outer peripheral vertical surface constituent range of the bent portion .

Moreover, as described in claim 4,
The upper joint part and the lower joint part draw a curve substantially equivalent to the curve of the bent part of the torsion beam.

Moreover, as described in claim 5,
The outer peripheral upper surface configuration range and / or the outer peripheral lower surface configuration range in the bent portion is a substantially flat surface in a stage before welding fixing of the vehicle body mounting member, and the bent surface side of the upper surface configuration portion in the base portion of the vehicle body mounting member And / or the bent portion side surface of the lower surface constituting portion is a substantially flat surface.

Moreover, as described in claim 6,
In the bent part of the torsion beam, a reinforcing gusset separate from the vehicle body mounting member is provided.

Moreover, as described in claim 7,
The upper joint part and the lower joint part of the reinforcing gusset draw a curve substantially equivalent to the curve of the bent part of the torsion beam.

Further, as described in claim 8,
The rear extension on the upper joint and the lower joint in the extension on the outer side of the vehicle in the base and the extension on the inner side of the vehicle, respectively. In the upper joint and the lower joint, a series of upper surface welds and a series from the one rear extension to the other rear extension, respectively. It is assumed that the bottom welded part is constructed.

  As effects of the present invention, the following effects can be obtained.

That is, in the invention according to claim 1,
When performing welding after taking into account the drooping of the weld bead, the welding can be completed by performing the lower joint by inverting the upper joint after the upper joint is welded. Since two steps can be performed, the processing time can be shortened.
Further, due to the presence of the welded portion of the rearward extending portion, it is possible to improve the welding strength particularly for a load acting in the direction opposite to the extending direction of the link portion.

In the invention according to claim 2,
Since the welding range is expanded due to the presence of the extending portion, this ensures a sufficient welding strength.

In the invention according to claim 3,
In the pre-welding stage, the distance between the axle and the center of the bush portion can be adjusted, and the process of determining product dimensions and accuracy of welding quality can be simplified. Thereby, it is possible to reduce the cost for quality assurance, reduce the occurrence of defective products, and reduce the occurrence of welding rework.

In the invention according to claim 4,
In the range where the bending portion is formed in the torsion beam, the rigidity can be improved substantially uniformly, and the occurrence of stress concentration at a specific portion of the bending portion can be prevented.

In the invention according to claim 5,
At the time of welding, the outer peripheral upper surface configuration range and the upper surface configuration portion, and the outer peripheral lower surface configuration range and the lower surface configuration portion can be bonded together on a substantially flat surface, respectively, It is possible to facilitate the management of the gap between the outer peripheral upper surface configuration range and between the lower joint portion with respect to the bent portion of the lower surface configuration portion and the outer peripheral lower surface configuration range. And thereby, generation | occurrence | production of the welding failure etc. by a clearance gap being too large can be prevented.

In the invention according to claim 6,
By welding the reinforcing gusset in addition to the vehicle body mounting member, it is possible to improve the rigidity of the bent portion formed by bending.

In the invention according to claim 7,
In the range that constitutes the bent portion of the torsion beam, the rigidity can be improved substantially uniformly, and the occurrence of stress concentration at a specific location of the bent portion can be prevented.

In the invention according to claim 8,
Since welding can be completed by forming a series of weld beads, the time required for the welding process can be shortened.

  Next, embodiments of the invention will be described.

Next, embodiments of the invention will be described.
As shown in FIG. 1, in the torsion beam 1 of the present embodiment, an end portion of the pipe material 10 is bent to form an arm portion 11R for supporting the axle 26R, and the bending portion 14R formed by the bending processing is formed on the bending portion 14R. The vehicle body attachment member 15R for connecting the torsion beam 1 to the vehicle body side is welded and fixed.

  Further, as shown in FIG. 1, the pipe material 10 is formed by bending the end portion of a straight pipe-shaped pipe material so that the arm portion 11R is directed toward the rear of the vehicle when the torsion beam 1 is installed in the vehicle. Shaped to extend. In FIG. 1, the upper side of the paper is the front of the vehicle, and the lower side of the paper is the rear of the vehicle, and it is shown that the arm portion 11 </ b> R is configured rearward by the tube shaft 10 a of the pipe material 10. .

  Moreover, in FIG. 1, only the site | part arrange | positioned at the right side of a vehicle is expanded, and as shown in the schematic of FIG. 2, the same structure is applied in the both right and left sides of a vehicle. As shown in FIGS. 1 and 2, vehicle body mounting members 15R and 15L are welded and fixed to the bent portions 14R and 14L formed by bending the pipe material 10, respectively. The torsion beam 1 is pivotally attached to the vehicle body as a whole by pivotally connecting the bush portions 16R and 16L arranged at the tip of the shaft to a shaft portion on the vehicle body (not shown).

  Further, as shown in FIGS. 1 and 4, a cylindrical bush portion 16R is disposed at the tip of the vehicle body attachment member 15R, and this bush portion 16R is pivoted to a shaft portion on the vehicle body side (not shown). The torsion beam 1 is pivotally attached to the vehicle body as a whole, and the vehicle body attachment member 15R functions as a link connecting the torsion beam 1 and the vehicle body.

  1, 3, and 4, the vehicle body attachment member 15 </ b> R includes an upper surface configuration portion 21, a vertical surface configuration portion 22, and a lower surface configuration portion 23, and has a surface parallel to the vehicle width direction C. In cross-sectional view, it is substantially U-shaped. The vehicle body attachment member 15R is long in the vehicle length direction and protrudes forward in the vehicle length direction in a state where it is welded and fixed to the bending portion 14R. In addition, the vertical surface constituting portion 22 is arranged on the vehicle outer side in the vehicle width direction C, and the vehicle inner side facing the vertical surface constituting portion 22 is opened.

  As shown in FIGS. 1 and 3, the vehicle body attachment member 15 </ b> R extends from the base 35 toward the front in the vehicle length direction, which forms a portion fixed to the bending portion 14 </ b> R side of the torsion beam 1. The link portion 36 is disposed at the tip of the bush portion 16R.

  Further, as shown in FIG. 3, the base portion 35 of the vehicle body mounting member 15R draws a curve substantially equivalent to the curve of the bending portion 14R of the torsion beam 1 from the boundary portion 37 with the link portion 36 in plan view. Thus, the extending portion 38 is formed on the base portion 35 on the outer side of the vehicle in the vehicle width direction C. The extending portion 38 is configured by extending the upper surface constituting portion 21, the vertical surface constituting portion 22, and the lower surface constituting portion 23 from the boundary portion 37 along the curve of the bending portion 14R. In this way, the rigidity of the bent portion 14R is improved substantially uniformly within the range of the bent portion 14R within the extended portion 38 (the same applies to the extended portion 28 described later) and the torsion beam 1 along the curve of the bent portion 14R. Therefore, it is possible to prevent the occurrence of stress concentration at a specific portion of the bent portion 14R.

  Further, as shown in FIGS. 3 and 5A, the extending portion 38 is configured to have a substantially U shape in which a side that is the inside of the vehicle is opened in a cross-sectional view orthogonal to the vehicle width direction C. Has been. Further, as shown in FIG. 5A, the upper surface constituting portion 21, the vertical surface constituting portion 22, and the lower surface constituting portion 23 constituting the extending portion 38 are respectively the outer peripheral upper surface constituting range 14a of the bent portion 14R of the torsion beam 1. The front outer peripheral vertical surface configuration range 14b and the outer peripheral lower surface configuration range 14c are arranged to face each other. Here, the outer peripheral upper surface configuration range 14a of the bent portion 14R is a range that can come into contact with the inner surface of the upper surface configuration portion 21 of the vehicle body mounting member 15R, and the outer peripheral lower surface configuration range 14c is the lower surface configuration of the vehicle body mounting member 15R. The front outer peripheral vertical surface configuration range 14b forms a range on the front side in the vehicle length direction of the outer periphery of the bent portion 14R, and is the outer peripheral upper surface configuration range. 14a and a range excluding the outer peripheral lower surface configuration range 14c.

  As shown in FIGS. 3 and 5A, the outer peripheral upper surface constituting range 14a and the outer peripheral lower surface constituting range 14c of the bent portion 14R are slightly smaller than the substantially flat surface at the stage before the vehicle body mounting member 15R is fixed by welding. It is also possible to give R which bulges outward. According to this, even when the upper surface constituting portion 21 and the lower surface constituting portion 23 are pressed against the outer peripheral upper surface constituting range 14a and the outer peripheral lower surface constituting range 14c, respectively, during the welding of the vehicle body attachment member 15R, Therefore, it is possible to prevent a problem that the bent portion 14 </ b> R configured to be excessively recessed inward. Further, it is possible to secure a wide contact area between the upper surface constituting portion 21 and the outer peripheral upper surface constituting range 14a and a contact area between the lower surface constituting portion 23 and the outer peripheral lower face constituting range 14c. Strength reinforcement after welding can be achieved. In FIG. 5A, only the outer peripheral upper surface configuration range 14a and the outer peripheral lower surface configuration range 14c of the bent portion 14R of the torsion beam 1 are marked with R. However, the upper surface configuration portion 21 and the lower surface configuration of the vehicle body attachment member 15R. R may be attached to the portion 23, or R may be attached to both the bent portion 14R side and the vehicle body attachment member 15R side.

  Further, as shown in FIGS. 3 and 5 (d), the outer peripheral upper surface constituting range 14a and the outer peripheral lower surface constituting range 14c in the bent portion 14R are substantially flat surfaces before the vehicle body mounting member 15R is fixed by welding. You can also. According to this, when the surface on the bent portion 14R side of the upper surface constituting portion 21 of the vehicle body attachment member 15R and the surface of the bent portion 14R of the lower surface constituting portion 23 are configured to be substantially flat surfaces, the upper surface constituting portion Management of the clearance between the upper joint 21a for the bent portion 14R and the outer peripheral upper surface configuration range 14a and between the lower joint 23a for the bent portion 14R of the lower surface constituent portion 23 and the outer peripheral lower surface configuration range 14c. Can be easily.

The welding fixing of the vehicle body attachment member 15R configured as described above to the bending portion 14R of the torsion beam 1 will be described.
In this welding and fixing, as shown in FIGS. 1 and 2, distances DR · DL between the centers 17R and 17L of the bush portions 16R and 16L of the vehicle body mounting members 15R and 15L and the axles 26R and 26L are defined. It is important to set the dimensions to. That is, it is important to obtain the dimensional accuracy of the distance DR / DL.

  First, as shown in FIG. 2, the vehicle body mounting members 15R and 15L are respectively attached to the bent portions 14R and 14L of the both ends of the pipe material 10, and the vehicle body mounting members 15R and 15L with respect to the pipe material 10 are formed. Positioning adjustment is performed. In this adjustment, the vehicle body mounting members 15R and 15L are set on a fixing jig (not shown), and the wheel mounting members 12R and 12L formed at both ends of the torsion beam 1 are set on a fixing jig (not shown). Done. As a result, the distances DR · DL between the axles 26R and 26L to be fixed to the wheel attachment members 12R and 12L and the centers 17R and 17L of the bush portions 16R and 16L at the tips of the vehicle body attachment members 15R and 15L are obtained. Set to specified dimensions. A wheel carrier (not shown) is attached to the wheel attachment members 12R and 12L.

  In the positioning adjustment stage, as shown in FIGS. 5A, 5B, and 5C, the vertical surface constituting portion 22 of the extending portion 38 of the vehicle body mounting member 15R and the front outer periphery of the bent portion 14R. The distance DR between the axle 26R and the center 17R of the bush portion 16R is adjusted so that the distance of the gap 40 formed between the vertical surface configuration range 14b is changed. Here, an important point is that adjustment can be made by moving the vehicle body attachment member 15R in the vehicle length direction L. Between the vehicle body attachment member 15R and the bending portion 14R, the vehicle length direction L is strictly measured. This means that adjustment for gap adjustment is unnecessary.

  After the adjustment of the distance DR / DL, as shown in FIGS. 3 and 6, first, the upper joint portion 21a constituting the edge on the bent portion 14R side of the upper surface constituting portion 21 is formed on the outer peripheral upper surface configuration of the bent portion 14R. Weld to range 14a. Thereafter, the torsion beam 1 and the vehicle body mounting member 15R are rotated so as to be turned over as a whole, and the lower joint portion 23a constituting the edge on the bent portion 14R side of the lower surface constituting portion 23 is changed to the outer peripheral lower surface constituting range of the bent portion 14R. Weld to 14c. In this welding process, welding is not performed between the end surface 22a on the bent portion 14R side of the vertical surface constituting portion 22 and the bent portion 14R. In other words, regarding the welding of the vehicle body attachment member 15R, welding is performed only for the portions disposed on the upper side and the lower side in a state where the torsion beam 1 is installed.

  Here, as shown in FIG. 7, the end surface 22a on the bent portion 14R side of the vertical surface constituting portion 22 is not welded, so there is a concern about the strength problem described in the background art. By providing the extending portion 38 in the base portion 35 of the member 15R, the stress inherent in the vertical surface constituting portion 22 is changed from the vertical surface constituting portion 38a in the extending portion 38 to the upper surface constituting portion 21 and the lower surface constituting portion. Since the stress is not concentrated by being transmitted to the upper surface welded portion 51 and the lower surface welded portion 52 through the portion 23, respectively, there is no problem in designing the mechanical strength.

  That is, sufficient rigidity can be ensured only by the upper surface welding portion 51 and the lower surface welding portion 52 in welding the vehicle body attachment member 15R and the bending portion 14R. As a supplementary explanation of why stress concentration does not occur, the presence of the vertical surface constituting portion 38a formed in the extending portion 38 causes the load and stress of the entire vertical surface constituting portion 22 to be dispersed so that the upper surface constituting portion 21 and the lower surface constitution It is mentioned that it is transmitted to the unit 23. Further, as an explanation of securing the welding strength, by providing the extension portion 38, the welding range T1 and T2 can be expanded for the upper surface welding portion 51 and the lower surface welding portion 52, respectively. It should be mentioned that the welding strength is ensured. In addition, about the length dimension and shape extended from the said boundary part 27 about the extension part 38, the mechanical strength and welding strength of extension part 38 itself shall be designed suitably.

  Further, as shown in FIGS. 1, 3, and 4, in connection with the improvement of the welding strength, the base portion 35 is connected to the boundary portion 27 between the base portion 35 and the link portion 36 on the inner side of the vehicle. It is good also as comprising the extension part 28 extended to the side used as the outer side. According to this, the welding range can be increased for the upper surface welded portion 51 and the lower surface welded portion 52, and the welding strength can be improved. In the present embodiment, the vehicle mounting member 15R is open on the inner side of the vehicle. However, the inner side is configured by a plate surface in the same manner as the vertical surface forming portion 22. According to this, the same effect as that of the extending portion 38 can be obtained in the extending portion 28 on the inner side of the vehicle with respect to the vehicle body attachment member 15R.

The present embodiment is configured as described above.
That is, as shown in FIG. 1 and FIG.
A torsion beam in which arm parts are formed by bending both ends of the pipe material;
A vehicle body attachment member 15R that is welded to the bending portion 14R formed by the bending process and connects the torsion beam to the vehicle body side, and
The vehicle body attachment member 15R is
A base 35 constituting a portion welded to the bent portion 14R of the torsion beam 1;
A link portion 36 that constitutes a portion extending from the base portion 35 toward the front in the vehicle length direction,
The base portion 35 includes an extending portion 38 that extends from the boundary portion 37 of the base portion 35 and the link portion 36 on the outer side of the vehicle to the outer side of the vehicle.
Among the joint portions of the base portion 35 to the bent portion 14R, welding is performed on each of the upper joint portion 21a on the upper side and the lower joint portion 23a on the lower side in a state where the torsion beam 1 is installed in the vehicle. Is to be given.

  With this configuration, as shown in FIG. 6, when welding is performed in consideration of drooping of the weld bead, the upper joint portion 21 a is reversed in the vertical direction after the upper joint portion 21 a is welded to perform the lower joint portion 23 a. Thus, the welding can be completed and the welding process can be performed in two steps, so that the processing time can be shortened. Further, as shown in FIG. 7, in this case, the end surface 22a of the vertical surface constituting portion 22 is not welded and there is a concern about strength problems. However, in the base portion 35 of the vehicle body attachment member 15R, the extended portion 38 is provided, stress concentration is not caused by the extending portion 38, and there is no problem in designing the mechanical strength of the vehicle body attachment member 15R itself. Furthermore, since the welding range T1 and T2 is expanded due to the presence of the extending portion 38, sufficient welding strength is ensured.

  Further, as shown in FIGS. 5A, 5B, and 5C, in the pre-welding stage, the upper joint portion 21a and the lower joint portion 23a are connected to the outer peripheral upper surface configuration range 14a and the outer periphery of the bent portion 14R. A gap 40 is formed between the vertical surface constituent portion 22 of the extending portion 38 and the front outer peripheral vertical surface constituent range 14b of the bent portion 14R in a state of being attached to the lower surface constituent range 14c. Is.

  With this configuration, as shown in FIG. 5 (c), it becomes possible to adjust the distance DR between the axle 26R and the center 17R of the bush portion 16R in the pre-welding stage. This makes it possible to simplify the process of putting out and welding quality accuracy. Thereby, it is possible to reduce the cost for quality assurance, reduce the occurrence of defective products, and reduce the occurrence of welding rework.

Moreover, as shown in FIG.1 and FIG.3,
The base portion 35 includes an extending portion 28 that extends from the boundary portion 27 between the base portion 35 and the link portion 36 on the inner side of the vehicle to the inner side of the vehicle.
Among the joint portions of the base portion 35 and the bent portion 14R, welding is performed on each of the upper joint portion 21a on the upper side and the lower joint portion 23a on the lower side when the torsion beam 1 is installed in the vehicle. Is to be given.

  As a result, as shown in FIG. 7, the welding range T <b> 3 is expanded due to the presence of the extending portion 28, thereby ensuring a sufficient welding strength.

Also, as shown in FIG.
The upper joint portion 21a and the lower joint portion 23a draw a curve substantially equivalent to the curve of the bent portion 14R of the torsion beam 1.

  With this configuration, it is possible to improve the rigidity substantially uniformly within a range in which the bending portion 14R is configured in the torsion beam 1, and it is possible to prevent the occurrence of stress concentration at a specific portion of the bending portion 14R.

In addition, as shown in FIG.
The outer peripheral upper surface configuration range 14a and / or the outer peripheral lower surface configuration range 14c in the bent portion 14R is a substantially flat surface before the vehicle body mounting member 15R is fixed by welding, and the upper surface of the base portion 35 of the vehicle body mounting member 15R. The surface on the bent portion 14R side of the component 21 and / or the surface on the bent portion 14R side of the lower surface component 23 is a substantially flat surface.

  With this configuration, at the time of welding, the outer peripheral upper surface configuration range 14a and the upper surface configuration portion 21, and the outer peripheral lower surface configuration range 14c and the lower surface configuration portion 23 can be attached to each other on a substantially flat surface. Management of the clearance between the upper joint 21a for the bent portion 14R and the outer peripheral upper surface configuration range 14a and between the lower joint 23a for the bent portion 14R of the lower surface constituent portion 23 and the outer peripheral lower surface configuration range 14c. Can be easily. And thereby, generation | occurrence | production of the welding failure etc. by a clearance gap being too large can be prevented.

  Example 2 is as shown in FIG. 8 and FIG. 9A, and the extending portions 38 </ b> A and 35 </ b> B that extend to the rear side in the vehicle length direction L in the extending portions 38 and 28, respectively. -35C and 35D are provided, and welding (welded portions 51A, 51B, 51C, and 51D) is applied to the rear extending portions 35A, 35B, 35C, and 35D.

  And as shown in FIG.8 and FIG.9 (a), the said back extension part 35A * 35B * 35C * 35D comprises each both ends of the said upper side junction part 21a and the lower side junction part 23a. Thus, the series of the upper surface welded portion 51 and the lower surface welded portion 52 each form a substantially U-shape (substantially U-shaped) in which the rear in the vehicle length direction is opened in plan view. The series of upper surface welded portion 51 and lower surface welded portion 52 are welded.

  As shown above, when the rear extending portions 35A, 35B, 35C, and 35D are provided and the series of the upper surface welded portion 51 and the lower surface welded portion 52 are substantially U-shaped (substantially U-shaped), they are shown in FIG. As described above, the welded portions 51A, 51B, 51C, and 51D that are long in the vehicle length direction L can be configured. And the welding strength can be improved by configuring the welded portions 51A, 51B, 51C, and 51D. In particular, the load acting in the vehicle length direction L in the vehicle body attachment member 15R is a shearing direction with respect to the welded portions 51A, 51B, 51C, and 51D. From this point, the presence of the welded portions 51A, 51B, 51C, and 51D In particular, the welding strength in the vehicle length direction L can be improved.

  Further, the direction in which the rearwardly extending portions 35A, 35B, 35C, and 35D are extended is opposite to the extending direction (on the imaginary line N) of the link portion 36 of the vehicle body attachment member 15R, and the link portion According to the direction perpendicular to the center 17R of the bush portion 16R at the tip of 36, the longitudinal direction of the welded portions 51A, 51B, 51C, 51D can be made to be a direction perpendicular to the center 17R, It is possible to reliably improve the welding strength for dealing with the load P acting in the extending direction of the link portion 36 (on the imaginary line N).

The present embodiment is configured as described above.
That is, as shown in FIG. 8 and FIG. 9A, the upper joint 21a and / or the lower joint 23a of the base 35 has an extension direction (on the imaginary line N) on the lower joint 23a. ) Extending in the opposite direction to at least one rear extending portion 35A / 35B / 35C / 35D, and the rear extending portion 35A / 35B / 35C / 35D is an outer peripheral upper surface configuration range of the bent portion 14R. 14a and / or the outer peripheral lower surface constituting range 14c.

  Accordingly, the presence of the welded portions 51A, 51B, 51C, and 51D of the rearward extending portions 35A, 35B, 35C, and 35D acts particularly in the direction opposite to the extending direction of the link portion 36 (on the imaginary line N). It is possible to improve the welding strength with respect to the load P.

  In the example shown in FIGS. 8 and 9A, the upper portion of the extension portion 38 on the outer side of the vehicle in the base portion 35 and the extension portion 28 on the inner side of the vehicle. In the joint portion 21a and the lower joint portion 23a, the rear extension portions 35A, 35B, 35C, and 35D are provided, respectively. In the upper joint portion 21a and the lower joint portion 23a, A series of upper surface welding parts 51 and a series of lower surface welding parts 52 are configured from one rear extension part 35A / 35C to the other rear extension part 35B / 35D, respectively.

  Thereby, since welding can be completed by formation of a series of weld beads, the time required for the welding process can be shortened. In addition to the configuration described above, the weld bead is welded only in the vicinity of the rear extension portions 35A, 35B, 35C, and 35D (welded portions 51a, 51b, 52a, and 52b, as shown in FIG. 9B). ), The welding range may be reduced, and the degree of freedom of welding work associated therewith may be improved. In particular, when sufficient strength and rigidity can be obtained by welding only the rear extension portions 35A, 35B, 35C, and 35D at both ends, it is possible to omit welding at other locations (partition welding). Implementation).

  The third embodiment is as shown in FIG. 10, and the reinforcing gussets 18R and 18L different from the vehicle body mounting members 15R and 15L are provided in the bent portions 14R and 14L of the torsion beam 1. In this embodiment, the bent portions 14R and 14L have reinforcements that are substantially U-shaped in cross-sectional view on the side opposite to the vehicle body mounting members 15R and 15L, similar to the base portion 35 of the vehicle body mounting members 15R and 15L. It is supposed to be welded to the gussets 18R and 18L. The reinforcing gussets 18R and 18L are also welded to the outer peripheral upper surface constituting range 14a and the outer peripheral lower surface constituting range 14c of the bent portions 14R and 14L in the same manner as the vehicle body mounting members 15R and 15L. As for the rotation, the welding process can be shortened by inverting the torsion beam 1 in the vertical direction.

  As described above, by welding the reinforcing gussets 18R and 18L in addition to the vehicle body attachment members 15R and 15L, the rigidity of the bent portions 14R and 14L formed by bending can be improved.

  Also in the present embodiment, the upper joint 18a and the lower joint 18b of the reinforcing gussets 18R and 18L draw curves that are substantially the same as the curves of the bent portions 14R and 14L of the torsion beam 1. .

  With this configuration, it is possible to improve the rigidity substantially uniformly within the range in which the bent portions 14R and 14L of the torsion beam 1 are configured, and it is possible to prevent the occurrence of stress concentration at specific portions of the bent portions 14R and 14L. it can.

The figure shown about the structure of the vehicle body attachment member in Example 1. FIG. The figure shown about the whole torsion beam which attaches a vehicle body attachment member. The figure shown about the structure of the base of the vehicle body attachment member in Example 1. FIG. The figure shown about the structure of the vehicle body attachment member in Example 1. FIG. (A) is a figure shown about the state by which the clearance gap comprised between an extension part and a bending part is formed largely. (B) is a figure shown about the state by which the clearance gap comprised between an extension part and a bending part is formed small. (C) is a figure explaining the adjustment of the movement of the vehicle body attachment member in the vehicle length direction. (D) is a figure shown about the example which comprises the upper and lower outer periphery of a bending part in a substantially flat surface. The figure explaining implementing a vehicle body attachment member in two processes of upper and lower welding. The figure explaining the load which acts on a vehicle body attachment member. The figure shown about the structure of the vehicle body attachment member in Example 2. FIG. (A) is a figure shown about the back extension part formed in the vehicle body attachment member in Example 2. FIG. (B) is a figure shown about the example which welds only to a back extension part. The figure explaining the reinforcement gusset of Example 3. FIG. The figure shown about the structure of the conventional vehicle body attachment member. The figure shown about the process of welding in the conventional vehicle body attachment member. The figure explaining the load which acts on the conventional vehicle body attachment member.

DESCRIPTION OF SYMBOLS 1 Torsion beam 10 Pipe material 11R Arm part 12R / 12L Wheel attachment member 14R / 14L Bending part 15R / 15L Car body attachment member 16R / 16L Bush part 17R / 17L Center 26R / 26L Axle 28 Extension part 35 Base 36 Link part 37 Boundary part 38 Extension

Claims (8)

A torsion beam in which arm parts are formed by bending both ends of the pipe material;
A vehicle body attachment member that is welded to a bending portion formed by the bending process and connects the torsion beam to the vehicle body side, and
The vehicle body mounting member is
A base portion constituting a portion to be welded to the bent portion of the torsion beam;
A link portion that constitutes a portion extending from the base portion toward the front in the vehicle length direction, and
The base portion includes an extending portion that extends from the boundary portion between the base portion and the link portion on the vehicle outer side to the vehicle outer side,
Among the joints to the bent part of the base, welding is performed for each of the upper joint that is the upper side in the state where the torsion beam is installed in the vehicle, and the lower joint that is the lower side ,
By providing a rear extension portion extending in a direction opposite to the extension direction of the link portion at both end portions of the upper joint portion of the base portion and / or both end portions of the lower joint portion, The upper joint portion and / or the lower joint portion is formed in a substantially U shape that is open in the rear in the vehicle length direction in a plan view, and the rear extension portion is an outer peripheral upper surface configuration range of the bent portion, and / or or Ru is welded to the outer peripheral lower surface configuration range,
This is a torsion beam suspension. The base portion includes an extending portion that extends from the boundary portion between the base portion and the link portion on the inner side of the vehicle to the inner side of the vehicle.
The torsion beam suspension according to claim 1 . In the state before the welding, the upper joint and the lower joint are attached to the outer peripheral upper surface configuration range and the outer peripheral lower surface configuration range of the bent portion, respectively, A gap is formed between the vertical surface configuration portion and the front outer peripheral vertical surface configuration range of the bent portion,
The torsion beam suspension according to claim 2 , wherein The upper joint part and the lower joint part draw a curve substantially equivalent to the curve of the bent part of the torsion beam.
The torsion beam suspension according to claim 2 , wherein the torsion beam suspension is provided. The outer peripheral upper surface configuration range and / or the outer peripheral lower surface configuration range in the bent portion is a substantially flat surface in a stage before welding fixing of the vehicle body mounting member, and the bent surface side of the upper surface configuration portion in the base portion of the vehicle body mounting member And / or the surface on the bent portion side of the lower surface constituting portion is a substantially flat surface,
The torsion beam suspension according to any one of claims 2 to 4 , wherein the suspension is a torsion beam suspension. In the bent portion of the torsion beam, a reinforcing gusset separate from the vehicle body mounting member is provided.
The torsion beam suspension according to any one of claims 2 to 5 , wherein the suspension is a torsion beam suspension. The upper joint portion of the reinforcing gusset and the lower joint portion draw a curve substantially equivalent to the curve of the bent portion of the torsion beam.
The torsion beam suspension according to any one of claims 2 to 6 , wherein the suspension is a suspension. The rear extension on the upper joint and the lower joint in the extension on the outer side of the vehicle in the base and the extension on the inner side of the vehicle, respectively. In the upper joint and the lower joint, a series of upper surface welds and a series from the one rear extension to the other rear extension, respectively. The bottom welded part of the
The torsion beam suspension according to any one of claims 2 to 7 , wherein the suspension is a torsion beam suspension.

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