JP7076768B2 - Cross member structure for automobiles - Google Patents

Description

The present invention relates to a cross member structure for an automobile.

The frame of an automobile is composed of a side member extending in the length direction of the automobile and a cross member extending in the width direction of the automobile.

For example, Patent Document 1 discloses a frame composed of two side members represented by reference numeral 4 and two cross members represented by reference numerals 5 and 6. Although it is not described which part of the car body this frame is used for, it seems that it is arranged in the front part of the car body from the description of the front end cross member.

Further, Patent Document 2 discloses the structure of the rear subframe of an automobile. This rear subframe is composed of a front cross member and a rear cross member extending in the vehicle width direction, and two side members extending in the vehicle length direction.

Japanese Unexamined Patent Publication No. 2004-74819 JP-A-2015-155255

Members such as cross members and side members constituting the frame may be used to support the support members of the wheels. Although no such description is made in Patent Document 1, in Patent Document 2, the end of the cross member indicated by reference numeral 22 is indicated by a symbol 10 with one end of the upper link indicated by reference numeral 14. It is connected to one end of the lower link. The other end of the upper link and the other end of the lower link are connected to the support member of the wheel.

In the structure of Patent Document 2, a cross member having the above-mentioned lower link and upper link attachment portions is fixed on the side member indicated by reference numeral 20. In this structure, a large load is applied to the portion where the side member and the cross member are joined by the load input from the wheel. Since the cross member is configured to contact only on the side member, it is vulnerable to a load in which the wheel is displaced upward.

It is an object of the present invention to provide a cross member structure capable of distributing and supporting a load input from a wheel support member between the upper part and the lower part of the support portion.

It is a cross member structure that supports a wheel support member, and the cross member structure has a first mounting portion that supports a first connecting portion that is connected to the wheel support member and a second that is connected to the wheel support member. It has a cross-member structure including a second mounting portion that supports the connecting portion and a support portion that supports the first mounting portion and the second mounting portion, and the first mounting portion is fixed to the upper portion of the support portion. The second mounting portion is fixed to the lower part of the support portion, and the first mounting portion and the second mounting portion are a continuous integrated member beside the support portion, which is a cross member structure for automobiles (hereinafter referred to as “cross member structure”). It is simply called a cross-member structure) to solve the above problem.

In the above cross member structure, when a load is input from the wheel support member, the first mounting portion and the second mounting portion are continuous and integrated members next to the support portion, so that the second connecting portion is formed. And the load input through the first connecting portion is distributed and supported in both the connecting portion of the first mounting portion and the supporting portion and the connecting portion of the second mounting portion and the supporting portion. This makes it possible to prevent the load from being concentrated on only one of the connection portion between the first mounting portion and the support portion and the connection portion between the second mounting portion and the support portion.

In the above cross member structure, the second mounting portion includes a portion extending in the vehicle width direction, and it is preferable that the portion extending in the vehicle width direction abuts on the lower portion of the support portion. This makes it possible to increase the area in which the second mounting portion contacts the support portion and reduce the load acting per unit area. Further, the second connecting portion can be supported on the portion extending in the vehicle width direction.

In the above cross member structure, the first mounting portion includes a portion extending in the vehicle width direction, and it is preferable that the portion extending in the vehicle width direction abuts on the upper portion of the support portion. This makes it possible to increase the area in which the first mounting portion contacts the support portion and reduce the load acting per unit area. Further, the first connecting portion can be supported on the portion extending in the vehicle width direction.

In the above cross member structure, the first mounting portion and the second mounting portion are separately molded members, and by joining the first mounting portion and the second mounting portion to each other, they are made into an integral member. It is preferable to use the above. By making the first mounting part and the second mounting part separate members, even if the first mounting part or the second mounting part has a complicated shape, it can be molded by press molding or bending molding of the plate material. Become.

In the above cross member structure, it is preferable that the support portions of the first mounting portion and the second mounting portion are rod-shaped members extending in the vehicle length direction. By using a rod-shaped member, it is possible to use a frame component such as a side member or a cross member as a support portion. As a result, it is possible to reduce the weight and space.

The above cross member structure includes a first cross member extending in the vehicle width direction and located on the back side of the vehicle body, a second cross member extending in the vehicle width direction and located on the front side of the vehicle body, and a second cross member and a first cross member. The support portion that supports the first mounting portion and the second mounting portion, including the side cross member extending in the vehicle length direction so as to connect to the cross member, is preferably a side cross member. This cross-member structure is used, for example, fixed between a pair of side members. This makes it possible to reinforce the side members. Since this cross member structure includes the first cross member, the second cross member, and the side cross member and has a certain length in the vehicle length direction, a structure such as a heavy object or a fuel tank can be used. It will be possible to provide a place to fix. Further, since the side cross member is a member extending in the vehicle length direction, it can be suitably used as a support portion for supporting the first mounting portion and the second mounting portion.

According to the present invention, it is possible to provide a cross member structure capable of distributing and supporting a load input from a wheel support member between the upper part and the lower part of the support portion.

It is a top view which shows the state which attached the side cross member to the cross member structure which concerns on one Embodiment. It is a top view which shows only the cross member structure of FIG. It is a bottom view of the cross member structure of FIG. It is a side view of the cross member structure of FIG. It is a perspective view of the cross member structure of FIG. It is sectional drawing in the AA part of FIG. It is sectional drawing in the BB part of FIG. It is a rear view which shows the state which the support member of a wheel is attached to the cross member structure of FIG. It is a perspective view which shows the 1st attachment part and the 2nd attachment part fixed to a support part. It is a perspective view which shows the 1st attachment part and the 2nd attachment part fixed to a support part.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The embodiments listed below are merely examples, and the present invention is not limited thereto.

1 to 10 show an embodiment of a cross-member structure for automobiles (hereinafter, simply referred to as a cross-member structure). The cross member structure 1 includes a first cross member 11 extending in the vehicle width direction and located on the back side of the vehicle body, a second cross member 12 extending in the vehicle width direction and located on the front side of the vehicle body, and a second cross member 12. It has a pair of side cross members 13 having a shape extending in the vehicle length direction so as to connect the first cross member 11 and the first cross member 11.

As shown in FIG. 1, the above-mentioned cross member structure 1 is fixed to the rear portion of the two side members 9, and is called a rear cross member. The second cross member 12 is a member extending in the vehicle width direction, and the upper surfaces of both ends thereof are fixed to the lower surfaces of the respective side members 9. The side cross member 13 is provided with a curved portion 131 in a plan view or a bottom view, and the other end portion is curved toward the outside of the vehicle. One end of the side cross member 13 is fixed between the left and right ends and the center of the second cross member 12, and the other end of the side cross member 13 is fixed to the lower surface of the side member 9, respectively. Will be done. Both ends of the first cross member 11 are fixed between the curved portions 131 and one end of the left and right side members 9.

In the above cross member structure, the side cross member 13 having the curved portion 131 extends the pair of side cross members 13 inside the pair of side members 9 in the vehicle length direction. A space is formed between the side member 9 and the side cross member 13. Using this space, the first mounting portion 132, the second mounting portion 141, the first connecting portion 31, or the second connecting portion 33, which will be described later, can be mounted.

Both the second cross member 12 and the side cross member 13 are composed of a hollow tube having a circular cross section. As a result, the weight is reduced. The shapes of both members are not particularly limited, but may be composed of, for example, a hollow tube having a polygonal cross section.

The first cross member 11 includes a beam 111 and a reinforcement member 112 that reinforces the beam 111, as shown in FIGS. 6 and 7. As shown in FIGS. 6 and 7, the beam 111 includes a first beam 11a located on the front side of the vehicle body and a second beam 11b located on the back side of the vehicle body. The first beam 11a includes a first wall 111a arranged on the front side of the vehicle body and a third wall 111c extending from the upper end portion of the first wall 111a toward the back surface side of the vehicle body. The first wall 111a and the third wall 111c have a continuous shape. The second beam 11b includes a second wall 111b arranged on the back surface side of the vehicle body and a third wall 111d extending from the upper end portion of the second wall 111b toward the front surface side of the vehicle body. The second wall 111b and the third wall 111d have a continuous shape.

The beam 111 may be an integral member in which the third wall 111c and the third wall 111d are continuous. As shown in FIG. 6, by dividing the beam, even if the beam 111 has a complicated shape, it can be formed into the complicated shape by bending or press molding.

The beam includes a first wall 111a, a second wall 111b, and third walls 111c and 111d, and has a flat plate shape because the bottom surface, which is one surface, is open and has a complicated shape. Compared to the beam of, the strength is improved against twisting motion and bending motion. The shape of the beam is not limited to this, and any structure may be used as long as it can exhibit the rigidity required for the cross member structure. As shown in FIGS. 6 and 7, a reinforcement member 112 is joined to the beam 111 in order to further improve the intensity of the beam 111.

The reinforcement member 112 includes a first wall 112a arranged on the front side of the vehicle, a second wall 112b arranged on the back side of the vehicle, an upper end portion of the first wall 112a, and an upper end portion of the second wall 112b. It includes a continuous third wall 112c, and one of the lower surfaces has an open shape. The shape of the reinforcement member is not limited to this, and any structure may be used as long as it can exhibit the rigidity required for the cross member structure.

As shown in FIG. 7, with the reinforcement member 112 incorporated in the beam 111, the ends of the first wall 111a of the beam 111 and the first wall 112a of the reinforcement member 112 are fixed by welding, and the beam 111 is fixed. The end of the second wall 111b of the above and the end of the second wall 112b of the reinforcement member 112 are fixed by welding. Since the lower surface of the beam 111 is open, the beam 111 and the reinforcement member 112 can be welded from the open surface as shown in black in FIG. 7. As shown in FIG. 7, the third wall 111c of the first beam 11a and the third wall 111d of the second beam 11b are in an overlapping state, and as shown in black in FIG. 7, one of them is in an overlapping state. The other end is fixed to the top surface by welding.

As shown in FIG. 8, the cross member structure 1 of the present embodiment includes a first connecting portion 31 whose one end is connected to a wheel support member 3 such as a hub knuckle, and a first connecting portion 31. A first mounting portion 132 that supports the end portion, a second connecting portion 33 to which one end portion is connected to the wheel support member 3, and a second mounting portion 141 that supports the other end portion of the second connecting portion 33. , Includes a support portion 15 that supports the first mounting portion 132 and the second mounting portion 141. As shown by thick lines in FIGS. 9 and 10, in the cross member structure 1 of the present embodiment, the first mounting portion 132 is fixed to the upper portion of the support portion 15 by welding, and the second mounting portion 141 is fixed. It is fixed to the lower part of the support portion 15 by welding. The first mounting portion 132 and the second mounting portion 141 are continuous and integrated members beside the support portion 15.

As shown by the arrow A in FIGS. 9 and 10, when a load (hereinafter referred to as a push-up load) is input toward the upper part of the vehicle body, the first mounting portion 132 is pulled by the first connecting portion 31. It is pulled diagonally upward. Similarly, the second mounting portion 141 is also pulled diagonally upward by being pulled by the second connecting portion 33. As shown in FIGS. 9 and 10, since the first mounting portion 132 and the second mounting portion 141 are continuous integral members beside the support portion 15, the push-up load is applied to the upper portion of the support portion 15. It is dispersed and supported not only by the joint portion C but also by the joint portion D in the lower part of the support portion 15. This prevents the joint portion C and the first mounting portion 132 and the support portion 15 around the joint portion C from being damaged due to the load being concentrated on the joint portion C at the upper part of the support portion 15 when the push-up load is applied. Will be possible.

As shown by the arrow B in FIGS. 9 and 10, when a load (hereinafter referred to as a return load) is input toward the lower part of the vehicle body, the first mounting portion 132 is pulled by the first connecting portion 31. It is pulled diagonally downward. Similarly, the second mounting portion 141 is also pulled diagonally downward by being pulled by the second connecting portion 33. As shown in FIGS. 9 and 10, since the first mounting portion 132 and the second mounting portion 141 are continuous integral members beside the support portion 15, the return load is applied to the lower part of the support portion 15. It is dispersed and supported not only by the joint portion D but also by the joint portion C in the upper part of the support portion 15. As a result, it is possible to prevent the joint portion D and the second mounting portion 141 and the support portion 15 around the joint portion D from being damaged due to the load being concentrated on the joint portion D at the lower portion of the support portion 15 when the return load is applied. It will be possible. Push-up or return loads occur, for example, as the wheel passes over bumps and dips. The push-up load increases as the speed of the vehicle increases. The force of the cushioning member, which is a component constituting the suspension device such as a coil spring, is also added to the return load.

In the cross member structure 1 of the present embodiment, the first mounting portion 132 has a portion extending in the vehicle width direction. Specifically, as shown in FIGS. 9 and 10, the first mounting portion 132 includes a first wall 132a arranged on the front side of the vehicle body and a second wall 132b arranged on the back side of the vehicle body. , It has a third wall 132c that is arranged on the central side surface of the vehicle body and is continuous with the ends of the first wall 132a and the second wall 132b, and the upper and outer side surfaces of the vehicle body are released. The shape. Through holes 82a and 82b are provided in the first wall 132a and the second wall 132b, respectively, and as shown in FIG. 8, the other end of the first connecting portion 31 is supported in a state where it can be axially moved up and down. Has been done. The first wall 132a and the second wall 132b have a shape extending in the vehicle width direction, and have a structure in which the lower edge portion thereof abuts on the upper portion of the support portion 15.

In the above structure, since the first wall 132a and the second wall 132b abut on the upper part of the support portion 15, when the return load is input from the support member 3 of the wheel, the first wall 132a and the second wall 132b The input load is supported by the lower end portion abutting on the upper portion of the support portion 15. This prevents the joint portions C and D of the first mounting portion 132 and the second mounting portion 141, particularly the connecting portion D pulled downward, from being damaged by the input load. In the examples of FIGS. 10 and 11, since the joint portion is welded, breakage of the welded portion is prevented. When the joint portion is a fixing tool such as a screw, a bolt, or a screw receiver, damage to the fixing tool and the member to which the fixing tool is attached is prevented.

In the cross member structure 1 of the present embodiment, the second mounting portion 141 has a portion extending in the vehicle width direction and having a portion that abuts on the lower portion of the support portion 15. Specifically, as shown in FIGS. 9 and 10, the second mounting portion 141 utilizes the end portion of the beam 111 constituting the first cross member 11. This saves space and weight. The second mounting portion 141 has a first wall 111a of the beam arranged on the front side of the vehicle body and a second wall 111b of the beam arranged on the back side of the vehicle body, and has a bottom surface which is one surface. Has an open shape. Through holes 81a and 81b are provided in the first wall 111a of the beam 111 and the second wall 111b of the beam, respectively. As shown in FIG. 8, the other end of the second connecting portion 33 is pivotally supported in the through holes 81a and 81b in a state where the second connecting portion 33 can be axially moved up and down. The first wall 111a and the second wall 111b of the beam 111 have a shape extending in the vehicle width direction and have a structure of contacting the lower portion of the support portion 15.

Since the first wall 111a and the second wall 111b of the beam 111 come into contact with the lower part of the support portion 15, when a push-up load is input from the support member of the wheel, the upper edges of the first wall 111a and the second wall 111b Is in contact with the lower part of the support portion 15, so that the input load is supported. This prevents the joint portions C and D of the first mounting portion 132 and the second mounting portion 141, particularly the connecting portion C pulled upward, from being damaged by the input load. In the examples of FIGS. 10 and 11, since the joint portion is welded, breakage of the welded portion is prevented. When the joint portion is a fixing tool such as a screw, a bolt, or a screw receiver, damage to the fixing tool and the member to which the fixing tool is attached is prevented.

In the cross member structure 1 of the present embodiment, as shown in FIGS. 9 and 10, the first mounting portion 132 and the second mounting portion 141 are separately molded members. As a result, even if each member such as the first mounting portion 132, the second mounting portion 141, or the beam 111 has a complicated shape, the first mounting portion 132 and the second mounting portion 141 can be formed by press molding or bending molding of the metal plate material. , Or each member such as the beam 111 can be molded.

In the cross member structure 1 of the present embodiment, the first mounting portion 132 is provided with a first connecting portion 132d extending below the vehicle body. Further, the second mounting portion 141 is provided with a second connecting portion 111 f extending above the vehicle body. The first connection portion 132d and the second connection portion 111 f are joined by welding next to the support portion 15. As a result, the separately molded first mounting portion 132 and the second mounting portion 141 are made into a continuous integrated member on the side surface of the support portion.

The first connection portion 132d has a shape continuous with the second wall 132b of the first mounting portion 132, the lower edge portion has a shape along the outer shape of the support portion, and a flat portion for welding is formed along the vehicle length direction. It is a shape to be provided. As shown in FIG. 10, the lower edge portion of the first connecting portion 132d has a shape that follows the outer shape of the supporting portion 15. Further, the lower edge portion of the first mounting portion 132 is also shaped to follow the outer shape of the support portion 15. As a result, the area in which the first mounting portion 132 and the first connecting portion 132d come into contact with the support portion 15 is increased, the load acting per unit area is reduced, and the welding area is increased.

The second connecting portion 111 f has a shape continuous with the first wall 111 a of the beam 111 and extends upward of the vehicle body, and has a shape along the side surface from the lower portion of the support portion 15. In the example of FIG. 9, the second connecting portion 111 f is an arm-shaped member having a curved portion composed of a flat plate, and is fixed to the first wall 111 a of the beam 111 by welding. As shown in FIGS. 9 and 10, the inner edge portion of the second connecting portion 111 f has a shape that follows the outer shape of the support portion 15. Further, the upper edge portion of the second mounting portion 141 is also shaped to follow the outer shape of the support portion. As a result, the area in which the second mounting portion 141 and the second connecting portion 111 f come into contact with the support portion 15 is increased, the load acting per unit area is reduced, and the welding area is increased.

As shown by the thick line in FIGS. 9 and 10, the first connection is made by fixing the two to the flat portion of the first connection portion 132d by welding while the inner edge portion of the second connection portion 111 f is in contact with the flat portion. The portion 132d and the second connecting portion 111f are continuous and integrated members.

Either one of the first connection portion and the second connection portion may be omitted, and one connection portion for joining the first mounting portion and the second mounting portion may be provided. Further, the first mounting portion, the second mounting portion, and the connecting portion may be integrally formed. In any case, it is preferable that the connecting portion has a shape including a portion that abuts along the outer shape of the support portion 15.

In the cross member structure 1 of the present embodiment, the support portion 15 that supports the first mounting portion 132 and the second mounting portion 141 utilizes a side cross member 13 that is a rod-shaped member extending in the vehicle length direction. In addition, as the rod-shaped member, for example, the first cross member 11, the second cross member, or the side member 9 may be used. When a member extending in the vehicle width direction such as the first cross member 11 or the second cross member 12 is used as a support portion, the first mounting portion 132 and the second mounting portion 141 are mounted on the front surface or the back surface of the support portion 15. Continuous. The front and back shall also be included next to the support. In addition, as the support portion, for example, a box-shaped cross member having a side surface, a bottom surface, and an upper surface may be used.

In the above cross-member structure, the wheel support member 3 is supported by the third connecting portion 32 in addition to the first connecting portion 31 and the second connecting portion 33, as shown in FIG. One end of the third connecting portion 32 is pivotally supported by the support member 3 of the wheel in a state where it can be axially moved up and down. The other end of the third connecting portion 32 is pivotally supported by a third mounting portion 121 provided on the lower surface of the second cross member 12 so as to be axially movable up and down. The third mounting portion 121 is continuous with the first wall 121a arranged on the front side of the vehicle body, the second wall 121b arranged on the back side of the vehicle body, and the lower ends of the first wall 121a and the second wall 121b. It has a third wall 121c, and both side surfaces of the vehicle body have an open shape. Through holes 83a and 83b are provided in the first wall 121a and the second wall 121b of the third mounting portion 121, respectively, and the other end of the third connecting portion 32 is pivotally supported.

In the cross member structure 1 described above, the first connecting portion 31, the second connecting portion 33, and the third connecting portion 32 are each composed of a link rod. The first connecting portion 31, the second connecting portion 33, and the third connecting portion 32 form a link mechanism, and the support member of the wheel can be displaced up and down according to the input load. .. The first connecting portion and the second connecting portion are not limited to the link rod, and may be replaced with, for example, a lower arm, an upper arm, or the like.

Although the cross member structure 1 described above has been described with an example of being a rear cross member, it can also be used as a front cross member. Further, in the above-mentioned cross member structure 1, the end portion of the beam is used as the second mounting portion, but a second mounting portion different from the beam may be provided. The shapes of the first mounting portion and the second mounting portion are not limited to the above examples, and may be any shape as long as the first connecting portion and the second connecting portion can be pivotally supported.

1 Cross member structure 3 Wheel support member 31 1st connecting part 132 1st mounting part 33 2nd connecting part 141 2nd mounting part 11 1st cross member 12 2nd cross member 13 Side cross member

Claims (6)

It is a cross member structure that supports the wheel support members, and has a cross member structure.
The cross member structure includes a first mounting portion that supports the first connecting portion that is connected to the wheel support member, and a first mounting portion.
A second mounting part that supports the second connecting part that is connected to the wheel support member,
It is a cross member structure including a support portion that supports the first mounting portion and the second mounting portion.
The first mounting part is fixed to the upper part of the support part,
The second mounting part is fixed to the lower part of the support part.
The first mounting portion and the second mounting portion are members made of a metal plate and molded separately.
The first mounting portion includes a first connecting portion extending below the vehicle body.
Supports the first connection portion of the first mounting portion, the second connection portion fixed to the second mounting portion, extending between the first mounting portion and the second mounting portion, and made of a metal plate material. By joining on the side of the part, the first mounting part and the second mounting part are made into an integral member.
The second connection portion has a cross member structure for automobiles, in which the first mounting portion and the second mounting portion are separately molded members. The cross-member structure for automobiles according to claim 1, wherein the second mounting portion includes a portion extending in the vehicle width direction, and the portion extending in the vehicle width direction abuts on the lower portion of the support portion. The cross-member structure for automobiles according to claim 1 or 2, wherein the first mounting portion includes a portion extending in the vehicle width direction, and the portion extending in the vehicle width direction abuts on the upper portion of the support portion. The cross-member structure for automobiles according to any one of claims 1 to 3, wherein the second mounting portion has a shape extending in the vehicle width direction and a shape having a built-in reinforcement member. The cross-member structure for automobiles according to any one of claims 1 to 4, wherein the support portion of the first mounting portion and the second mounting portion is a rod-shaped member extending in the vehicle length direction. To connect the first cross member extending in the vehicle width direction and located on the back side of the vehicle body, the second cross member extending in the vehicle width direction and located on the front side of the vehicle body, and the second cross member and the first cross member. It is a cross member structure for automobiles including a side cross member extending in the vehicle length direction.
The cross-member structure for automobiles according to any one of claims 1 to 5, wherein the support portion that supports the first mounting portion and the second mounting portion is a side cross member.

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