WO2020246044A1

WO2020246044A1 - Cross member and subframe of suspension

Info

Publication number: WO2020246044A1
Application number: PCT/JP2019/022826
Authority: WO
Inventors: 秀利仲里; 森　英之
Original assignee: 株式会社ヨロズ
Priority date: 2019-06-07
Filing date: 2019-06-07
Publication date: 2020-12-10

Abstract

[Problem] To provide a cross member which is used in a subframe of a suspension, and the stiffness of which can be improved while minimizing an increase in the number of parts or the weight of the subframe, and a subframe of a suspension. [Solution] A rear cross member 22 and a subframe 100 of a suspension according to the present invention have a long first plate member 30, a long second plate member 40, and a long third plate member 50 which are coupled to each other. The first plate member and the second plate member are provided with flanges 31 and 41, flanges 32 and 42, and connecting parts 33 and 43 that connect the flanges 31 and 41 and the flanges 32 and 42. The flange 41 abuts the flange 31 and the flange 42 abuts the connecting part 33 in a cross-section where the second plate member crosses the left-right direction Y. The third plate member abuts the flange 32 of the first plate member and the connecting part of the second plate member or the flange 42.

Description

Cross member and suspension subframe

The present invention relates to a cross member and a suspension subframe.

Suspensions with a subframe structure are widely known. As a suspension having a subframe structure, it is generally known that a pair of side members arranged on the left and right and a pair of cross members connecting the left and right side members are arranged in the front and rear.

Japanese Unexamined Patent Publication No. 2008-1307

Parts such as the suspension arm, which is a connection part with the tire, are attached to the suspension subframe. External force from the tire is input to the mounting part of the suspension arm in the subframe. The subframe generally includes a long member that constitutes a side member, a cross member, or the like.

In order to improve the rigidity against the above external force, relatively small parts may be attached or joined to the long parts at various places. However, such a method may increase the number of parts of the subframe or increase the weight.

Therefore, an object of the present invention is to provide a cross member and a suspension subframe used for a suspension subframe capable of increasing rigidity without increasing the number of parts or weight of the subframe as much as possible.

The cross members according to one aspect of the present invention are joined to each other and each have an elongated first plate material, second plate material, and third plate material. The first plate material and the second plate material each include a first flange, a second flange, and a connecting portion for connecting the first flange and the second flange. In the second plate material, the first flange abuts on the first flange of the first plate material and the second flange abuts on the connecting portion of the first plate material in a cross section intersecting in the longitudinal direction. The third plate material is in contact with the second flange of the first plate material and the connecting portion or the second flange of the second plate material.

It is a perspective view which shows the subframe of the suspension which concerns on one Embodiment of this invention. It is a top view of FIG. It is a perspective view which shows the rear cross member which constitutes the subframe of a suspension. It is an exploded perspective view of a rear cross member. It is a cross-sectional view perpendicular to the axis in the left-right direction of the front cross member. It is sectional drawing which follows line 6-6 of FIG. It is sectional drawing which concerns on the modification of FIG. It is sectional drawing which concerns on the modification of FIG. It is sectional drawing which concerns on the modification of FIG. It is sectional drawing which concerns on the modification of FIG. It is sectional drawing which concerns on the modification of FIG. It is sectional drawing which concerns on the modification of FIG. It is sectional drawing which concerns on the modification of FIG. It is sectional drawing which concerns on the modification of FIG. It is sectional drawing which concerns on the modification of FIG. It is sectional drawing which concerns on the modification of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the attached drawings.

In the following, the orthogonal coordinate system and the cylindrical coordinate system will be illustrated in the drawing for the explanation using the drawings. X in the Cartesian coordinate system indicates the front-rear direction in which the front cross member 21 and the rear cross member 22 are arranged in the subframe 100 of the suspension. Y in the Cartesian coordinate system indicates the left-right direction in which the left member 11 and the right member 12 are arranged in the subframe 100 of the suspension. Z in the Cartesian coordinate system indicates the height direction of the suspension subframe 100.

As shown in FIG. 1, the suspension subframe 100 has a pair of side members 10 arranged apart from each other and a pair of long crosses connecting the side members constituting the pair of side members 10 to each other. It has a member 20 and. The details will be described below.

(Side member)
The side member 10 is connected to the cross member 20 in the vicinity of the end portion of the cross member 20 in the left-right direction Y when mounted on a vehicle. As shown in FIG. 1, the side member 10 includes a left member 11, a right member 12, and a color 13. The left member 11 and the right member 12 are located at predetermined intervals in the left-right direction Y.

As shown in FIG. 2, the side member 10 is formed as a substantially annular fan shape or a hollow fan shape when viewed in a plan view from the height direction Z. However, if the suspension subframe 100 can be attached to the vehicle body, the specific shape is not limited to this. The side member 10 may have a rectangular shape or a complicated shape other than the above.

As shown in FIGS. 1 and 2, the collar 13 is provided at both ends of the fan shape in the angular direction θ of the left member 11 and the right member 12, respectively. The collar 13 corresponds to the vehicle body mounting location of the suspension subframe 100.

(Cross member)
As shown in FIG. 1, the cross member 20 includes a front cross member 21 arranged on the front side in the front-rear direction X and a rear cross member 22 arranged on the rear side in the front-rear direction X.

(Front cross member)
The front cross member 21 connects the left member 11 and the right member 12 constituting the pair of side members 10 to each other. As shown in FIG. 5, the front cross member 21 is composed of

elongated constituent members

23 and 24 extending in the left-right direction Y. As shown in FIG. 5, the

constituent members

23 and 24 include

flanges

25 and 26 formed by bending both ends of a substantially flat plate material, and a connecting portion 27 provided between the flange 25 and the flange 26. ..

The front cross member 21 is joined with the

flanges

25 and 26 of the constituent member 23 and the

flanges

25 and 26 of the constituent member 24 facing each other. The flange 25 and the flange 26 are configured to have substantially the same height in the height direction Z. However, the heights of the

flanges

25 and 26 do not have to be the same as long as the

constituent members

23 and 24 can be joined.

Further, the connecting portion 27 connecting the flange 25 and the flange 26 is configured as a flat shape in FIG. However, as long as the suspension subframe 100 can be mounted on the vehicle, the specific shape of the connecting portion 27 is not limited to a flat shape, and may be a curved surface or a more complicated shape.

As shown in FIG. 5, the

constituent members

23 and 24 form a substantially U-shaped cross section perpendicular to the axis in the longitudinal direction (same as the left-right direction Y). However, if the

constituent members

23 and 24 can form a hollow cross section by joining, the specific cross-sectional shape of each is not limited to the U shape. In addition to the above, for example, only one of the

constituent members

23 and 24 may have a U-shape, and the other may have a flat cross-sectional shape.

As shown in FIG. 5, the

constituent members

23 and 24 form an internal space S3 by the

flanges

25 and 26 and the connecting portion 27.

(Rear cross member)
The rear cross member 22 connects the left member 11 and the right member 12 constituting the pair of side members 10 to each other. As shown in FIGS. 4 and 6, the rear cross member 22 includes a first plate member 30, a second plate member 40, a third plate member 50, and a collar 60 that are joined to each other.

The rear cross member 22 is formed into a polygonal hollow shape by the first plate material 30, the second plate material 40, and the third plate material 50. In the present embodiment, the cross section of the rear cross member 22 is formed into a polygon as shown in FIG. 6, but if a hollow cross section can be formed, the cross section shape is not limited to the polygon as shown in FIG. May be formed in a shape having no vertices (corners) such as a hollow perfect circle or an ellipse.

(1st plate material)
As shown in FIG. 6, the first plate material 30 is formed between

flanges

31 and 32 formed by bending both ends of the plate material in a cross section intersecting the longitudinal direction (corresponding to the left-right direction Y), and between the flange 31 and the flange 32. The connection portion 33 provided is provided. The second plate member 40 includes

flanges

41 and 42 and a connecting portion 43. In the present specification, the

flanges

31 and 41 correspond to the first flange, and the

flanges

32 and 42 correspond to the second flange.

The first plate material 30 is formed in a substantially U shape as shown in FIG. 6 in the present embodiment. However, if the rear cross member 22 can be formed of a hollow long member together with the second plate member 40 and the third plate member 50, the specific cross-sectional shape is not limited to the U shape.

(2nd plate material)
In addition to the

flanges

41 and 42 and the connecting portion 43, the second plate member 40 further includes a raised portion 45 formed between the connecting portion 43 and the flange 42.

The flange 41 of the second plate material 40 is arranged inward of the flange 31 of the first plate material 30. In the second plate material 40, as shown in FIG. 6, the flange 31 is joined to the flange 41 and the flange 42 is joined to the connecting portion 33 with the

flanges

41 and 42 facing the

flanges

31 and 32 of the first plate material 30. ing.

As a result, the opposite sides of the substantially octagons having an axially orthogonal cross-sectional shape intersecting the longitudinal direction (horizontal direction Y) of the rear cross member 22 are connected to each other.

By joining the first plate material 30 and the second plate material 40 as described above, the internal space S1 is formed as shown in FIG. The raised portion 45 is provided in order to improve the layout with other parts that are close to each other and the rigidity of the rear cross member 22 when the vehicle is mounted.

As shown in FIG. 6, the raised portion 45 is configured to be located outside the connecting portion 43 in the front-rear direction X in the present embodiment. However, depending on the rigidity required for the vehicle on which the suspension subframe 100 is mounted and the rear cross member, the raised portion 45 may not be provided.

As shown in FIG. 4, holes 34 and 44 for attaching the collar 60 are formed in the connection portion 33 of the first plate material 30 and the connection portion 43 of the second plate material 40, respectively. The

holes

34 and 44 are formed in a substantially circular shape in the present embodiment. However, if the collar 60 can be attached, the specific shape is not limited to a substantially circular shape.

Further, the lower parts A1 and A2 in the vicinity of both ends of the rear cross member 22 shown in FIG. 3 in the left-right direction Y are configured as connection portions to which the connection parts C with the tire such as the suspension arm shown in FIG. 2 are attached. The left-right direction Y corresponds to the longitudinal direction of the first plate material 30, the second plate material 40, and the third plate material 50. As shown in FIG. 2, the connecting component C is configured as a long member.

In the present embodiment, as shown in FIG. 2, when the first plate material 30, the second plate material 40, and the third plate material 50 are viewed in a plan view when the vehicle is mounted, the elongated shape of the connecting component C is in the left-right direction. It is particularly suitable when it is attached to the rear cross member 22 in a state of being tilted with respect to Y.

The shapes of the connecting parts in FIG. 2 are shown only schematically for convenience of illustration, and the actual shape is not limited to this. Further, in FIG. 3, the upper portions A3 and A4 of the rear cross member 22 in the height direction Z from the lower portions A1 and A2 are configured as connection portions with the side member 10 of the rear cross member 22.

(Third plate material)
As shown in FIG. 6, the third plate material 50 has a flange 51 and a flange 52 formed by bending both ends of the plate material in a cross section intersecting in the longitudinal direction, and a parallel portion 53 provided between the flange 51 and the flange 52. And. As shown in FIG. 6, the third plate material 50 is arranged above the second plate material 40 in the present embodiment, and is arranged behind the first plate material 30 together with the second plate material 40.

As shown in FIG. 6, the flange 51 of the third plate material 50 is configured to extend alongside the flange 42 of the second plate material 40. The flange 51 is arranged so as to be separated from the flange 42 by the connecting portion 43 of the second plate member 40. The flange 52 is arranged inward of the flange 32 of the first plate member 30.

The flange 52 extends along the flange 31 or the flange 32 of the first plate member 30. The flange 51 corresponds to the first extending portion in the present specification. The flange 52 corresponds to the second extending portion. The parallel portion 53 is configured to extend in parallel with at least one of the connecting portion 33 of the first plate member 30 and the connecting portion 43 of the second plate material 40.

As shown in FIG. 6, the third plate material 50 is joined to the first plate material 30 and the second plate material 40 with the

flanges

51 and 52 facing the

flanges

31 and 32 of the first plate material 30. Specifically, the flange 51 is joined to the connecting portion 43 or the flange 42 of the second plate material 40, and the flange 52 is joined to the flange 32 of the first plate material 30. In FIG. 6, the flange 51 is joined to the connecting portion 43 in the vicinity of the end portion in the height direction Z of the connecting portion 43. The internal space S2 is formed by joining the third plate material 50 to the first plate material 30 and the second plate material 40 as described above.

As shown in FIGS. 3 and 4, the parallel portion 53 of the third plate member 50 is formed so that the length in the vicinity of the

holes

34 and 44 in the longitudinal direction is shorter than the length of both ends in the longitudinal direction. The third plate member 50 is formed in a substantially U-shape in the axially orthogonal cross section in the longitudinal direction, similarly to the first plate member 30. However, as with the first plate member 30, the specific cross-sectional shape is not limited to the U shape.

Color 60 corresponds to the part where the parts on the vehicle side such as the differential are attached.

As described above, the rear cross members 22 constituting the suspension subframe 100 according to the present embodiment are joined to each other, and each of them is a long first plate material 30, a second plate material 40, and a third plate material. Has 50. The first plate member 30 and the second plate member 40 include

flanges

31, 41,

flanges

32, 42, and connecting

portions

33, 43 connecting the

flanges

31, 41 and the

flanges

32, 42.

In the second plate material 40, the flange 41 abuts on the flange 31 of the first plate material 30 and the flange 42 abuts on the connecting portion 33 of the first plate material 30 in a cross section intersecting in the longitudinal direction. The third plate material 50 is in contact with the flange 32 of the first plate material 30 and the connecting portion 43 or the flange 42 of the second plate material 40.

By abutting and joining the flange 42 of the second plate material 40 to the connecting portion 33 of the first plate material 30 in this way, the flange 42 can be used as a shape for reinforcing the rigidity in the cross section of the hollow rear cross member 22.

The second plate material 40 and the third plate material 50 are formed in a long shape. Then, by arranging the second plate material 40 and the third plate material 50 with respect to the first plate material 30 as described above, a plurality of other relatively small parts are joined to the first plate material 30. The rigidity of the rear cross member 22 can be efficiently strengthened by the parts. Therefore, the rigidity of the subframe 100 can be increased while suppressing the increase in the number of parts or the weight of the subframe 100 as much as possible.

Further, the third plate material 50 includes a flange 51 extending alongside the flange 42 of the second plate material 40. As a result, the rigidity can be strengthened with respect to the input from the front-rear direction X in which the flange 42 and the flange 51 are aligned.

Further, the flange 51 is separated from the flange 42 by the connecting portion 43 of the second plate member 40. By arranging the flange 51 with respect to the second plate material 40 as described above, the third plate material 50 can be easily joined to the second plate material 40.

Holes

34, 44 for connecting vehicle body parts are formed in the

connection portions

33, 43 of the first plate material 30 and the second plate material 40. The third plate member 50 includes a parallel portion 53 extending in parallel with at least one of the connecting

portions

33 and 43. The parallel portion 53 is formed so that the length of the parallel portion 53 is shorter in the vicinity of the

holes

34 and 44 than at both ends in the left-right direction Y in the longitudinal direction in the cross section intersecting the longitudinal direction.

Holes

34 and 44 may or may not be required in the specifications of the vehicle to be mounted, such as two-wheel drive or four-wheel drive. On the other hand, by configuring the parallel portion 53 of the third plate member 50 as described above, the rear cross member 22 can be used for a plurality of specifications.

The third plate member 50 includes a flange 31 of the first plate member 30 or a flange 52 extending along the flange 32. The flange 41 of the second plate material 40 is arranged inward of the flange 31 of the first plate material 30, and the flange 52 of the third plate material 50 is arranged inward of the flange 32 of the first plate material 30.

By arranging the flange 41 of the second plate material 40 and the flange 52 of the third plate material 50 with respect to the

flanges

31 and 32 of the first plate material 30 in this way, the second plate material 40 and the third plate material 50 are placed on the first plate material 30. The joining work can be performed from the same direction. As a result, it is possible to share the equipment or eliminate the trouble of changing the posture of the product in the manufacturing process, and the manufacturing process can be simplified accordingly.

Further, a connecting portion connected to the connecting component C with the tire is provided in the vicinity of the end portion in the longitudinal direction of the first plate material 30, the second plate material 40, and the third plate material 50. The connecting component C is attached so as to be inclined with respect to the left-right direction Y when the first plate member 30, the second plate member 40, and the third plate member 50 are viewed in a plan view when mounted on a vehicle.

In such a case, the rear cross member 22 may be required to have higher rigidity. Therefore, by configuring the first plate material 30, the second plate material 40, and the third plate material 50 as described above, the above requirements are made. The specifications can be met more effectively.

Further, the suspension subframe 100 includes the rear cross member 22 and the front cross member 21 described above, and a pair of side members 10 connected to the cross member in the vicinity of the end portion of the cross member in the left-right direction Y when mounted on a vehicle. Has. As a result, as described above, it is possible to enhance the rigidity while suppressing the increase in the number of parts and the weight of the suspension subframe as much as possible.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. In the above, it has been described that the rear cross member 22 includes the collar 60 so that it can be mounted on various vehicles, but a rear cross member that does not include the collar 60 is also included in one embodiment of the present invention. When the rear cross member does not include the collar, the width of the bent portion of the third plate member 50 does not have to be changed in the left-right direction Y, and may be constant.

7 to 10 are cross-sectional views showing a modified example of FIG. In the above, the embodiment in which the third plate member 50 includes the

flanges

51 and 52 and the parallel portion 53 has been described, but the present invention is not limited thereto. If the internal space S2 can be formed by the first plate material 30, the second plate material 40a, and the third plate material 50a, the third plate material 50a does not have a connecting portion as shown in the rear cross member 22a of FIG. 7, and the

flanges

51a and 52a It may be configured by.

Further, the third plate material 50b not only includes the

flanges

51 and 52 and the parallel portion 53 like the third plate material 50, but also along the connecting portion 43 of the second plate material 40 as shown in the rear cross member 22b of FIG. The contact portion 54 that comes into contact with the connection portion 43 may be provided. Thereby, the joint strength between the third plate material 50b and the second plate material 40a can be improved.

Further, although the embodiment in which the connecting portion 33 of the first plate member 30 is formed substantially flat has been described, the present invention is not limited to this. In addition to the above, as shown in the

rear cross members

22c and 22d of FIGS. 9 and 10, the connecting portions 33c and 33d of the

first plate members

30c and 30d are provided with shapes other than the flat shapes such as the

convex shapes

33e and 33f. You may. As a result, the rigidity of the rear cross member can be improved by the cross-sectional shape of the first plate material.

11 is a cross-sectional view of the modified example of FIG. 6, FIG. 12 is a sectional view of the modified example of FIG. 7, FIG. 13 is a sectional view of the modified example of FIG. 8, and FIG. FIG. 15 is a cross-sectional view according to a modified example of FIG.

In the above embodiment, the

flanges

31 and 41 correspond to the first flange, the

flanges

32 and 42 correspond to the second flange, the flange 51 corresponds to the first extending portion, and the flange 52 corresponds to the second extending portion. explained. However, the embodiment of the present invention is not limited to the above as long as the matters described in the claims are satisfied.

In addition to the above, for example, the

flanges

31 and 32 of the first plate material 30 may be configured to change the mode of contact between the second plate material and the third plate material.

That is, as shown in FIG. 11, the rear cross member 22e may be configured by inverting the positional relationship between the second plate member 40 and the third plate member 50 with respect to FIG.

Similarly, as shown in FIG. 12, the rear cross member 22f may be configured by inverting the positional relationship between the second plate material 40a and the third plate material 50a with respect to FIG. 7.

Similarly, as shown in FIG. 13, the rear cross member 22g may be configured by inverting the positional relationship between the second plate member 40a and the third plate member 50b with respect to FIG. 8.

Similarly, as shown in FIG. 14, the rear cross member 22h may be configured by inverting the positional relationship between the second plate material 40a and the third plate material 50b with respect to FIG. 9.

Similarly, as shown in FIG. 15, the rear cross member 22k may be configured by inverting the positional relationship between the second plate member 40a and the third plate member 50b with respect to FIG. 10.

Further, as for the arrangement of the rear cross members, those shown in FIGS. 6 to 15 in which the directions are reversed are also included in one embodiment of the present invention.

FIG. 16 is a cross-sectional view showing a rear cross member 22 m which is a modified example of FIG. Although the embodiment in which the flange 51 of the third plate member 50 is joined to the connecting portion 43 of the second plate member 40 has been described above, the present invention is not limited to this. In addition to the above, the flange 51c of the third plate material 50c may be configured to be joined to the flange 42 of the second plate material 40. Further, as shown in FIG. 11, an inverted version of FIG. 16 is also included in one embodiment of the present invention.

In addition, those in which the abutting combinations of the

flanges

31, 32, 41, 42, 51, and 52 are appropriately changed with respect to the above-described embodiment are also included in the present invention as long as they satisfy the configurations specified in the claims. Included in one embodiment.

Further, although the embodiment in which the present invention is applied to the rear cross member has been described above, the present invention is not limited to this, and may be applied to a cross member other than the rear cross member connecting the left and right side members.

10 (pair) side members,
20 (pair) cross members,
21 Front cross member,
22 Rear cross member,
30 First plate material,
40 Second plate material,
50 Third plate material,
31, 41 flange (first flange),
32, 42 flanges (second flange),
33, 43 connections,
51 Flange (1st extension),
52 Flange (second extension),
53 Parallel part,
100 suspension subframe,
X front-back direction,
Y left and right,
Z height direction.

Claims

They are joined to each other and each has an elongated first plate, second plate, and third plate.
The first plate material and the second plate material each include a first flange, a second flange, and a connecting portion for connecting the first flange and the second flange.
In the second plate material, the first flange abuts on the first flange of the first plate material, and the second flange abuts on the connection portion of the first plate material in a cross section intersecting in the longitudinal direction.
The third plate material is a cross member that is in contact with the second flange of the first plate material and the connection portion of the second plate material or the second flange.
The cross member according to claim 1, wherein the third plate material includes a first extending portion extending alongside the second flange of the second plate material.
The cross member according to claim 2, wherein the first extending portion is separated from the second flange by the connecting portion of the second plate material.
The cross member according to any one of claims 1 to 3, wherein the third plate material includes a contact portion that comes into contact with the connection portion along the connection portion of the second plate material.
In the first plate material and the second plate material, a hole portion for connecting a vehicle body component is formed in the connection portion.
The third plate material includes a parallel portion extending in parallel with the connection portion.
The cross member according to any one of claims 1 to 4, wherein the parallel portion is formed so that the length in the vicinity of the hole portion is shorter than the length at the end portion in the longitudinal direction.
The third plate material includes a second extending portion extending along the first flange or the second flange of the first plate material.
The first flange of the second plate material is arranged inward from the first flange of the first plate material, and the second extending portion of the third plate material is from the second flange of the first plate material. The cross member according to any one of claims 1 to 5, which is arranged inward.
A connection portion connected to a connection component with a tire is provided in the vicinity of the end portion of the first plate material, the second plate material, and the third plate material in the longitudinal direction.
The connection component according to any one of claims 1 to 7, wherein the first plate material, the second plate material, and the third plate material are attached so as to be tilted in the left-right direction when the third plate material is viewed in a plan view when mounted on a vehicle. Cross member of.
With the cross member according to any one of claims 1 to 7.
A subframe of a suspension having a pair of side members connected to the cross member in the vicinity of the end portion of the cross member in the left-right direction when mounted on a vehicle.