JP6593297B2 - Suspension member - Google Patents

Description

  The present invention relates to a suspension member.

  A suspension member in which a front cross member is installed at the front end portions of a pair of left and right side rails and an engine mount bracket for supporting a power unit including an engine is provided on the front cross member has been conventionally known (for example, , See Patent Document 1).

JP 2005-289115 A

  However, if the front cross member is only installed at the front end of the pair of left and right side rails, when the vibration from the engine is transmitted to the front cross member, the front cross member is locally deformed out of plane. There is a risk.

  Therefore, an object of the present invention is to obtain a suspension member that can suppress local deformation of the front cross member locally even when vibration from the engine is transmitted to the front cross member.

  In order to achieve the above object, a suspension member according to a first aspect of the present invention includes a pair of left and right members having a front side rail portion extending in the vehicle body longitudinal direction and a cross portion extending inward in the vehicle width direction. The front body mount, a front cross member extending in the vehicle width direction and having both ends in the vehicle width direction joined to the cross portion, and one end in the vehicle width direction overlapping one of the cross portions, And an engine mount bracket provided on the front cross member.

  According to the first aspect of the present invention, one end in the vehicle width direction of the engine mount bracket provided on the front cross member overlaps one of the cross portions where the both ends in the vehicle width direction of the front cross member are joined. is doing. Therefore, the rigidity of the portion of the front cross member where the engine mount bracket is provided is improved as compared with a configuration in which one end of the engine mount bracket in the vehicle width direction does not overlap with one of the cross portions. Therefore, even if vibration from the engine is transmitted to the front cross member, local deformation of the front cross member is suppressed.

  As described above, according to the present invention, even if vibration from the engine is transmitted to the front cross member, the front cross member can be prevented from being locally deformed out of plane.

It is a perspective view which shows the suspension member which concerns on this embodiment seeing from an upper side. It is a disassembled perspective view which shows the suspension member which concerns on this embodiment seeing from an upper side. It is a perspective view which shows the suspension member which concerns on this embodiment seeing from a downward side. FIG. 2 is a cross-sectional view taken along line XX in FIG. 1. It is a YY arrow directional cross-sectional view in FIG. It is a perspective view which expands and shows a part of front cross member of the suspension member which concerns on this embodiment.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. For convenience of explanation, an arrow UP appropriately shown in each figure is a vehicle body upward direction, an arrow FR is a vehicle body front direction, and an arrow RH is a vehicle body right direction. In addition, in the following description, when the vertical, front / rear, and left / right directions are described without special mention, the vertical direction of the vehicle body, the front / rear direction of the vehicle body, and the left / right direction of the vehicle body (vehicle width direction) are indicated. To do.

  The suspension member 12 according to this embodiment shown in FIG. 1 to FIG. 3 is suspended from the front side member below the front part of a pair of left and right front side members (not shown) extending in the longitudinal direction of the vehicle body. It is to be supported in the state where Each front side member has a kick portion for positioning the front side of the vehicle body higher than the rear side of the vehicle body.

  Therefore, the suspension member 12 has a front end portion of a pair of left and right front body mounts 22, which will be described later, mounted on the front end portion of the front side member on the front side of the vehicle body with respect to the kick portion, and is the rear end portion. A pair of left and right fastening portions 46 of the rear cross member 40 to be described later is attached to the lower end portion of the kick portion.

  As shown in FIGS. 1 to 3, the suspension member 12 includes a front frame 14 having a substantially “U” shape in plan view and a substantially “U” shape in plan view joined to the rear side of the vehicle body of the front frame 14. And a rear frame 16. The front frame 14 includes a front cross member 20 extending in the vehicle width direction, and a pair of left and right front body mounts 22 provided at both ends in the longitudinal direction (vehicle width direction) of the front cross member 20. .

  The front cross member 20 is formed in a fixed rectangular closed cross-sectional shape in a cross-sectional view orthogonal to the longitudinal direction (vehicle width direction) by extrusion molding of a light metal material such as an aluminum alloy. Each front body mount 22 is formed in a substantially “L” shape in a plan view by press molding of a light metal material such as an aluminum alloy. And a lower mount 28 having an open sectional shape.

  Each corner portion of the pair of left and right front body mounts 22 is a mount portion 24 supported by the front end portion of each front side member, and each mount portion 24 has a through hole 24A penetrating in the vertical direction. Is formed. A cylindrical collar member 25 (see FIG. 2) is inserted and attached to each through hole 24A from the lower side of the vehicle body.

  In addition, the inner side in the vehicle width direction than the mount portion 24 of each front body mount 22 is a cross portion 36 having a rectangular closed cross section extending inward in the vehicle width direction. Then, as will be described later, the respective cross portions 36 are respectively covered on both ends in the vehicle width direction of the front cross member 20 (the both ends in the vehicle width direction of the front cross member 20 are respectively inserted into the respective cross portions 36). These are joined linearly by arc welding to both ends in the vehicle width direction (see FIG. 4).

  An engine mount bracket 18 formed with a length shorter than that of the front cross member 20 is provided on the left end side from the substantially central portion of the upper wall 20U of the front cross member 20 in the longitudinal direction (extending direction). Joined by arc welding. The engine mount bracket 18 is formed in an open cross-sectional shape in which the lower side of the vehicle body is opened by die casting of a light metal material such as an aluminum alloy, and the engine mount 60 (see FIG. 6) is attached to the upper surface side thereof. .

  That is, a power unit (not shown) including an engine and a transmission is disposed on the vehicle body upper side of the suspension member 12, and the power unit is mounted at least by the suspension member 12 and the like via the engine mount 60. It is configured to be supported from below. The mounting structure 10 (see FIGS. 1, 5, and 6) for the engine mount bracket 18 will be described in detail later.

  Further, a protector 38 formed with a length substantially the same as that of the front cross member 20 is joined to the lower wall 20D of the front cross member 20 by bolt fastening or welding. The protector 38 is formed in an open cross-sectional shape in which the upper side of the vehicle body is opened by press molding of a light metal material such as an aluminum alloy, and is configured to protect the entire lower wall 20D of the front cross member 20 from interference with the road surface. Yes.

  A pair of left and right front side rail portions 30 extending in the front-rear direction of the vehicle body is formed on the vehicle body rear side of the mount portion 24 of each front body mount 22. Each front side rail portion 30 has a rectangular closed cross-sectional shape in a cross-sectional view orthogonal to the extending direction, and the vehicle width is substantially at the center in the extending direction (vehicle body longitudinal direction) of each front side rail portion 30. A bent portion 32 that is convex toward the vehicle body lower side as viewed from the side when viewed from the side is formed.

  Further, between the front side rail portion 30 of the upper mount 26 and the front side rail portion 30 of the lower mount 28, a reinforcing rail portion 34 (see FIG. 2) extending in the vehicle body front-rear direction is provided. The reinforcing rail portion 34 is formed in an open cross-sectional shape in which the lower side of the vehicle body is opened by press molding of a light metal material such as an aluminum alloy, and reinforces from the bent portion 32 to the rear end portion of the front side rail portion 30. And extended to the end.

  The rear frame 16 has a rear cross member 40 extending in the vehicle width direction. The rear cross member 40 includes an upper member 42 and a lower member 44 that is provided on the lower surface side of the upper member 42 and protects the lower surface side thereof. The upper member 42 is formed in an open cross-sectional shape in which the lower side of the vehicle body is opened by die casting of a light metal material such as an aluminum alloy, and the lower member 44 is an open cross-section in which the upper side of the vehicle body is opened by press molding of a light metal material such as an aluminum alloy. It is formed into a shape.

  Fastening portions 46 for attaching to the lower end portions of the kick portions of the front side members are formed at the rear portions of both ends of the upper member 42 in the vehicle width direction. Lower arm attachment portions 48 for attaching lower arms (not shown) constituting suspension arms (not shown) are formed at both ends in the vehicle width direction of the upper member 42 on the front side of the vehicle body from the fastening portion 46.

  Further, a pair of left and right upper rail portions 43 extending toward the front side of the vehicle body are integrally formed at the front ends of both ends in the vehicle width direction of the upper member 42. A pair of left and right lower rail portions 45 extending to the left are integrally formed. The left and right side surfaces of each upper rail portion 43 and the left and right side surfaces of each lower rail portion 45 are joined in a line by arc welding to form a pair of left and right rectangles having a rectangular closed cross-sectional shape in a cross-sectional view orthogonal to the extending direction. A rear side rail portion 50 is configured.

  And the front part of each rear side rail part 50 covers the rear part of each front side rail part 30 (the rear part of each front side rail part 30 is inserted in each rear side rail part 50), and each rear side rail part 50 The front edge portion of each of the front side rail portions 30 is overlapped with a wall surface (upper surface, lower surface, and left and right side surfaces) of each front side rail portion 30 by arc welding.

  That is, each rear side rail portion 50 extends along each front side rail portion 30, and the edge portion at the front portion of the upper rail portion 43 is at the rear portion of the upper mount 26 constituting the front side rail portion 30. Arc welding is performed on the upper surface and the left and right side surfaces, and the edge portion of the front portion of the lower rail portion 45 is arc welded to the lower surface and the left and right side surfaces of the rear portion of the lower mount 28 constituting the front side rail portion 30.

  As described above, the front side rail portion 30 and the rear side rail portion 50 are joined at the joint portion by arc welding, whereby the front frame 14 and the rear frame 16 are integrally joined, and the front side rail portion 30 and the rear side rail are joined together. A suspension member 12 is formed in which the rail portion 50 continuously extends in the longitudinal direction of the vehicle body, and the front cross member 20 and the rear cross member 40 extend in the vehicle width direction.

  Next, the joining structure of the front cross member 20 and the cross part 36 and the mounting structure 10 of the engine mount bracket 18 to the front cross member 20 will be described in detail with reference to FIGS. 1 and 4 to 6. 4 and 5, the protector 38 is omitted.

  First, a joint structure between the front cross member 20 and the cross part 36 will be described. As shown in FIG. 4, the upper front and rear corner portions 52 at both ends of the front cross member 20 in the vehicle width direction are covered with front and rear flange portions 36 </ b> A bent to the vehicle body lower side of the cross portion 36 in the upper mount 26. . And the lower edge part of 36 A of front-and-back flange parts is joined to the outer surface of the front wall 20F of the front cross member 20, and the outer surface of the rear wall 20B by arc welding at linear form.

  Similarly, the lower front and rear corner portions 54 at both ends in the vehicle width direction of the front cross member 20 are covered with front and rear flange portions 36B that are bent toward the vehicle body upper side of the cross portion 36 in the lower mount 28. And the upper edge part of the front-and-back flange part 36B is joined to the outer surface of the front wall 20F of the front cross member 20 and the outer surface of the rear wall 20B in a line by arc welding.

  Further, the inner side edge in the vehicle width direction of the cross portion 36 in the upper mount 26 is linearly joined to the outer surface of the upper wall 20U of the front cross member 20, the outer surface of the front wall 20F, and the outer surface of the rear wall 20B by arc welding. ing. Then, the inner side edge in the vehicle width direction of the cross portion 36 in the lower mount 28 is linearly joined to the outer surface of the lower wall 20D of the front cross member 20, the outer surface of the front wall 20F, and the outer surface of the rear wall 20B by arc welding. ing. As described above, both ends in the vehicle width direction of the front cross member 20 are joined to the cross portions 36 of the upper mount 26 and the lower mount 28, respectively.

  Next, the mounting structure 10 for the engine mount bracket 18 to the front cross member 20 will be described. As shown in FIG. 6, the engine mount 60 is supported by left and right support members 62 and 64, and the lower ends of the support members 62 and 64 are fixed to the engine mount bracket 18 by bolt fastening. . As a result, the engine mount 60 is attached to the engine mount bracket 18.

  More specifically, a bolt insertion hole (not shown) is formed at the lower end portion of the right support member 62, and the right end portion side of the engine mount bracket 18 (substantially central portion of the front cross member 20 in the vehicle width direction). A bolt insertion hole 19 </ b> A (see FIGS. 1 to 3) is also formed in the projecting portion 19 projecting back and forth. Accordingly, the bolt 66 is inserted into the bolt insertion hole 19 </ b> A or the like from the upper side of the vehicle body and is screwed into a nut (not shown), so that the support member 62 that supports the engine mount 60 is the overhang portion 19 of the engine mount bracket 18. It is fixed to.

  As shown in FIGS. 5 and 6, a bolt insertion hole 64 </ b> A is formed in the lower end portion of the left support member 64, and the bolt insertion hole 18 </ b> A is also formed on the left end side of the engine mount bracket 18. Is formed. A bolt insertion hole 56 is formed in the upper wall 20U of the front cross member 20, and an operation for inserting a tool (not shown) for holding the nut 68 into the lower wall 20D of the front cross member 20. A hole 58 is formed.

  Therefore, the bolt 66 is inserted into the bolt insertion holes 64A, 18A, 56 from the upper side of the vehicle body, and the nut 68 held non-rotatable by a tool (not shown) inserted from the work hole 58 formed in the lower wall 20D. By screwing, the support member 64 that supports the engine mount 60 is fixed to the upper wall 20U together with the left end side of the engine mount bracket 18. Note that a through hole 28A (see also FIG. 2) for exposing the work hole 58 is formed in the cross portion 36 of the left lower mount 28.

  As shown in FIGS. 1 and 6, the left end portion (one end portion in the vehicle width direction) of the engine mount bracket 18 has an inner end portion in the vehicle width direction in the cross portion 36 of the left side (one) upper mount 26. A band-shaped covering portion 18B that rises by the thickness of the plate is bent. The covering portion 18B overlaps the vehicle width direction inner end of the cross portion 36 of the upper mount 26 in the vehicle width direction (see FIG. 6) (the vehicle width direction of the cross portion 36 of the upper mount 26). Covering the inner edge from above).

  Further, as shown in FIGS. 5 and 6, the upper front and rear corner portions 52 between the substantially central portion of the front cross member 20 in the longitudinal direction (extending direction) and the cross portion 36 of the left upper mount 26 are respectively The engine mount bracket 18 is covered with a front and rear flange portion 18C that is bent toward the vehicle body lower side.

  That is, the front and rear flange portions 18C of the engine mount bracket 18 are superimposed on the outer surface of the front wall 20F of the front cross member 20 and the outer surface of the rear wall 20B. And the lower edge part of the front-and-rear flange part 18C is joined to the outer surface of the front wall 20F of the front cross member 20 and the outer surface of the rear wall 20B in a linear manner by arc welding. The engine mount bracket 18 is attached to the upper wall 20U side of the front cross member 20 by the arc welding and the bolt fastening.

  As shown in FIGS. 1 and 6, the cross portion 36 of the left (one) lower mount 28 extends further inward in the vehicle width direction than the cross portion 36 of the left upper mount 26. It faces the mounting bracket 18 in the vertical direction of the vehicle body. In other words, the engine mount bracket 18 overlaps the cross portion 36 of the lower mount 28 in the vehicle width direction L2 (see FIG. 6). Therefore, in FIG. 5, the engine mount bracket 18 is shown on the upper wall 20U side of the front cross member 20, and the cross part 36 of the lower mount 28 is shown on the lower wall 20D side of the front cross member 20.

  Next, the operation of the suspension member 12 according to the present embodiment configured as described above will be described.

  As shown in FIG. 1, an engine mount bracket 18 is attached to the left end portion side from the substantially central portion in the longitudinal direction (extending direction) of the upper wall 20 </ b> U of the front cross member 20. As shown in FIGS. 5 and 6, an engine mount 60 is attached to the right end side of the engine mount bracket 18 via support members 62 and 64.

  Accordingly, vibrations from the power unit (engine) are caused to pass through the engine mount 60 and the engine mount bracket 18 at the substantially central portion of the upper wall 20U of the front cross member 20 at least in the longitudinal direction (extending direction). Is transmitted. That is, due to the vibration transmitted from the power unit, a load F (refer to FIG. 5) heading forward in the vehicle body direction is input to at least a substantially central portion of the upper wall 20U of the front cross member 20 in the longitudinal direction.

  However, the covering portion 18B formed at the left end portion of the engine mount bracket 18 attached to the front cross member 20 exceeds the inner end portion in the vehicle width direction of the cross portion 36 of the left upper mount 26 in the vehicle width direction. The lap is L1. The engine mount bracket 18 overlaps the cross portion 36 of the left lower mount 28 in the vehicle width direction L2.

  Therefore, the rigidity of the portion of the front cross member 20 where the engine mount bracket 18 is provided is improved as compared with the configuration in which the engine mount bracket 18 (including the covering portion 18B) does not overlap the left cross portion 36. be able to. That is, even when a load F directed forward in the vehicle body direction is input to at least a substantially central portion in the longitudinal direction of the upper wall 20U of the front cross member 20, the front cross member 20 is locally deformed out of plane in the vehicle body forward direction. (Distortion is generated) can be suppressed.

  In addition, if the cross-sectional shape of the front cross member 20 is increased, the rigidity can be improved. However, in this case, it is difficult to dispose peripheral components of the front cross member 20. Further, if the plate thickness of the front cross member 20 is increased, the rigidity can be improved, but the advantage of reducing the weight of the vehicle by using a light metal material such as an aluminum alloy for the front cross member 20 is lost.

  According to the suspension member 12 according to the present embodiment, the engine mount bracket 18 in the front cross member 20 can be provided without increasing the cross-sectional shape of the front cross member 20 and without increasing the plate thickness of the front cross member 20. The rigidity of the provided part can be improved.

  That is, according to the suspension member 12 according to the present embodiment, an increase in weight due to an increase in the plate thickness of the front cross member 20 can be prevented, and a change in the arrangement of peripheral components can be eliminated. And since the plate | board thickness of the front cross member 20 can be reduced to required minimum, the front cross member 20 can be reduced in weight and, as a result, a vehicle can be reduced in weight.

  Further, as shown in FIG. 4, the upper front and rear corner portions 52 and the lower front and rear corner portions 54 on both end sides of the front cross member 20 are covered with the cross portion 36 of the front body mount 22. By suppressing the local out-of-plane deformation of the member 20 in the front direction on the vehicle body, the cross portion 36 of the front body mount 22 is also prevented from being deformed out of the plane with the front cross member 20 in the front direction on the vehicle body. .

  Therefore, as compared with a configuration in which the engine mount bracket 18 (including the covering portion 18B) does not overlap the cross portion 36, vibration from the power unit is present at least at the substantially central portion in the longitudinal direction of the upper wall 20U of the front cross member 20. When transmitted (when a load F heading forward in the vehicle body is input), the front and rear flange portions 36A and 36B of the cross portion 36 are separated from the outer surface of the front wall 20F and the outer surface of the rear wall 20B. Can also be suppressed or prevented.

  In addition, since the cross part 36 of the front body mount 22 and the front cross member 20 are line-bonded by arc welding, both can be firmly bonded and foreign matter can be prevented or prevented from entering between the two. be able to. Accordingly, the occurrence of electrolytic corrosion between the two can be suppressed or prevented. The same applies to the wire joining by arc welding between the front side rail portion 30 of the front body mount 22 and the rear side rail portion 50 of the rear cross member 40.

  Further, since the engine mount bracket 18 and the upper member 42 of the rear cross member 40 are formed by die casting of a light metal material such as an aluminum alloy, it is possible to easily form a seating surface, a boss or the like for attaching other components. it can. That is, the engine mount bracket 18 and the upper member 42 of the rear cross member 40 are highly rigid, but have a high degree of freedom in shape, and can reduce the number of components (shape rationalization).

  The suspension member 12 according to the present embodiment has been described with reference to the drawings. However, the suspension member 12 according to the present embodiment is not limited to the illustrated one, and does not depart from the gist of the present invention. The design can be changed as appropriate. For example, the light metal material is not limited to an aluminum alloy, and may be a magnesium alloy or the like.

  Further, the engine mount bracket 18 is not limited to the configuration in which the front cross member 20 is arranged from the substantially central portion to the left end side in the longitudinal direction (extending direction) of the front cross member 20. (Direction) It is good also as a structure arrange | positioned from the approximate center part to the right end part side. That is, the engine mount bracket 18 may be arranged in the opposite direction to that shown in the drawing.

  Further, the engine mount bracket 18 only needs to overlap at least the cross portion 36 of the upper mount 26 in the vehicle width direction, and may not overlap the cross portion 36 of the lower mount 28 in the vehicle width direction. . That is, the cross part 36 in the lower mount 28 may not extend to the inner side in the vehicle width direction than the cross part 36 of the upper mount 26.

  Further, the front body mount 22 is not limited to an aspect constituted by two members of the upper mount 26 and the lower mount 28, and at least the upper front and rear corner portions 52 and the lower front and rear corner portions 54 of the front cross member 20. If it can cover with the cross part 36, you may be comprised, for example by one member.

  That is, the front body mount 22 may be formed by extrusion so that the cross portion 36 has a substantially “C” cross section that continuously covers from the upper front / rear corner portion 52 to the lower front / rear corner portion 54. Good. Further, the upper mount 26 and the lower mount 28 of the front body mount 22 may be formed by die casting to improve the rigidity thereof.

  Moreover, the front cross member 20 is not limited to the structure formed by extrusion molding. For example, the upper cross member and the lower front cross member are formed by press molding, and are joined to each other. It is good. The engine mount bracket 18 is not limited to a configuration in which the front and rear flange portions 18C are linearly joined to the outer surface of the front wall 20F and the outer surface of the rear wall 20B of the front cross member 20 by arc welding, for example, spot welding. Or, it may be configured to be bolted.

  Further, welding for linearly joining the cross part 36 of the front body mount 22 and the front cross member 20 and welding for joining the front side rail part 30 of the front body mount 22 and the rear side rail part 50 of the rear cross member 40 are also performed. The method is not limited to arc welding, and may be laser welding, for example.

12 Suspension member 18 Engine mount bracket 20 Front cross member 22 Front body mount 30 Front side rail portion 36 Cross portion

Claims (1)

A pair of left and right front body mounts having a front side rail portion extending in the vehicle longitudinal direction and a cross portion extending inward in the vehicle width direction;
A front cross member extending in the vehicle width direction and having both ends in the vehicle width direction joined to the cross portion,
An engine mount bracket provided on the front cross member with one end in the vehicle width direction overlapping one of the cross portions;
Suspension member with