JP2008168791A - Suspension cross member structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a suspension cross member structure of an automobile having superior maintenance work efficiency of a power unit or the like and capable of ensuring the rigidity. <P>SOLUTION: A suspension cross member 10 comprises a front cross member 11 having a front fitting part 33 and a first supporting part 32 to be fitted to and supported by right and left front side frames 1 on each end of a front cross member body 11A extending in the vehicle width direction, and a rear cross member 41 having a second supporting part 45 to be separably fastened to the first supporting part 32 on each end of a rear cross member body 41A extending in the vehicle width direction behind an automobile body from the front cross member body 11A. The rigidity of the suspension cross member 10 can be ensured by the front cross member 11 and the rear cross member 41, a sufficient working space can be ensured on the back side of the front cross member 11 by separating the rear cross member 41, and the maintenance work efficiency is enhanced thereby. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a suspension cross member structure for an automobile, and more particularly to a suspension cross member structure that extends in the vehicle width direction and is supported by left and right front side frames to support a power unit and a suspension device.

  A suspension cross member provided between the left and right front frames of the automobile supports a power unit such as a front wheel suspension device, a front wheel steering device, and an engine. In general, the suspension cross member has a hollow shape in which the periphery of a pair of pressed upper and lower steel plates is welded, and a concave portion for accommodating a steering gear box is formed on the lower surface thereof extending in the vehicle width direction. However, if the concave portion extending in the vehicle width direction is formed, the rigidity in the front-rear direction of the suspension cross member is greatly reduced, so that the rigidity against the load input from the suspension device is required.

  An example of this type of suspension cross member is a suspension cross member structure disclosed in Patent Document 1. In the suspension cross member structure of Patent Document 1, recesses for accommodating the steering gear box are formed along the vehicle width direction on the lower surface of the suspension cross member whose both ends are supported by the left and right front side frames. A hollow portion continuous in the vehicle width direction is formed. The power unit is supported on the upper surface of the central portion of the suspension cross member via an engine mount bracket, and the suspension arms of the suspension device are supported on the lower surfaces of both end portions in the vehicle width direction. In addition, a reinforcing bracket and a reinforcing plate are provided for constructing a recess in the front and rear in the vicinity of both ends of the suspension cross member.

JP-A-6-122378

  According to the suspension cross member structure of Patent Document 1 described above, since the reinforcing bracket and the reinforcing plate are provided to construct the concave portion formed on the lower surface of the suspension cross member in the front-rear direction, the load applied to the suspension support portion from the suspension device is counteracted. To ensure the rigidity.

  However, both ends of a suspension cross member that is continuous in the vehicle width direction and is integrally formed with a relatively large width in the front-rear direction are supported by the left and right front side frames, and an engine mount bracket is interposed at the center of the suspension cross member. Therefore, when attaching or detaching the power unit for maintenance work, etc., the suspension cross member that has a large outer dimension and a large weight together with the power unit must be detached from the left and right front side frames, which makes maintenance work easier. It is a factor that obstructs.

  On the other hand, in recent years, there is a tendency to shorten the distance from the front overhang, that is, the center of the front wheel to the front end of the vehicle body, in order to ensure the freedom of vehicle body design and the space in the vehicle interior. For this reason, it is necessary to shorten the engine room in the front-rear direction, the space for disposing the suspension cross member is limited, and it is difficult to form a recess for accommodating the steering gear box on the lower surface of the suspension cross member. The work of detaching and attaching the attachment device for maintenance of the attachment device such as the steering gear box disposed in the recess is troublesome, and there is a concern that the burden on the operator is increased.

  Accordingly, an object of the present invention made in view of such a point is to provide an automobile suspension cross member structure that is excellent in maintenance workability and can ensure rigidity.

  The suspension cross member structure for an automobile according to claim 1, which achieves the above object, extends in the vehicle width direction and is supported by the left and right front side frames to support the power unit and the suspension device. In the suspension cross member structure, a front cross member having a front attachment portion and a first support portion attached to and supported by the left and right front side frames at each end, and a rear cross member body from the front cross member main body. A rear cross member having a second support portion that is separably fastened to each of the first support portions is provided at each end portion.

  According to this invention, the suspension cross member extends in the vehicle width direction at the rear of the vehicle body from the front cross member, which extends in the vehicle width direction and is mounted and supported on the left and right front side frames. Since the rear cross member is provided with a second support portion that is detachably fastened to the first support portion provided on the front cross member, the rigidity of the suspension cross member is ensured by the front cross member and the rear cross member. In addition, since the front cross member and the rear cross member are arranged close to each other, the size of the suspension cross member in the front-rear direction can be suppressed, and the size and weight can be reduced.

  In addition, by separating the rear cross member from the front cross member, a sufficient working space can be secured on the rear side of the front cross member, and maintenance and inspection work such as attachment and detachment of the power unit and mounting equipment is facilitated. The burden on the person can be greatly reduced.

  According to a second aspect of the present invention, in the suspension cross member structure for an automobile according to the first aspect, the first support portion has an U-shaped cross section and has an upper mounting portion that is opposed to each other through a mounting hole penetrating in the vertical direction. And the lower mounting portion, and the second support portion is fitted between the upper mounting portion and the lower mounting portion of the opposing first support portion, and an insertion hole penetrating in the vertical direction is formed. A fastener for fastening the first support portion and the second support portion together with the front side frame through the attachment holes of the upper attachment portion and the lower attachment portion and the insertion holes of the tubular tube. It is characterized by having.

  According to this invention, the tube of the second support portion is fitted between the upper attachment portion and the lower attachment portion of the first support portion, and the first support portion and the second support portion are connected to the front side frame by the fastener. By fastening together, the coupling rigidity between the first support part and the second support part and the coupling rigidity between the first support part and the second support part and the front side member can be ensured. Furthermore, since the front cross member and the rear cross member are joined and attached to the front side member by a single fastener, the detachability of the rear cross member is improved.

  According to a third aspect of the present invention, in the suspension cross member structure for an automobile according to the second aspect, the first suspension support bracket having an upper end coupled to the front cross member main body and a first suspension mounting portion provided at the lower end; A second suspension mounting portion that extends in the vertical direction facing the first suspension support bracket and supports the suspension arm of the suspension device in cooperation with the first suspension mounting portion is provided at the lower portion, and the upper mounting portion is provided at the upper portion. A formed second suspension support bracket; a rear mounting bracket formed with the lower mounting portion coupled to the second suspension support bracket and facing the upper mounting portion; and an upper portion of the first suspension support bracket; Upper connection to connect the upper part of the second suspension support bracket A racket, a lower connection bracket for connecting a lower portion of the first suspension support bracket and a lower portion of the second suspension support bracket, a vehicle width direction inner portion of the first suspension support bracket, and a vehicle width direction of the second suspension support bracket An inner connection panel that connects the inner portion and the front cross member main body is provided.

  According to the present invention, the first suspension support bracket, the second suspension support bracket, the rear mounting bracket, the upper connection bracket, the lower connection bracket, and the inner connection panel, which are relatively simple in shape, suppress weight and secure rigidity. A suspension support portion that supports the first support portion and the suspension device thus formed can be formed.

  According to a fourth aspect of the present invention, in the automobile suspension cross member structure according to any one of the first to third aspects, a connecting plate for detachably connecting the front cross member main body and the rear cross member main body is provided. It is characterized by having.

  According to the present invention, the rigidity of the suspension cross member is further improved and the vibration of the suspension cross member can be suppressed by connecting the front cross member main body and the rear cross member main body with the connection plate. Furthermore, it functions as a protective cover that protects the power unit and the mounting device from pebbles and the like that the connecting plate scatters.

  In addition, the input load from the suspension arm and the impact load at the time of collision, for example, the load input from the power unit to the suspension cross member can be distributed over a wide range of the front cross member and the rear cross member, and the input load is efficiently applied to the front side frame. Distributed transmission.

  According to a fifth aspect of the present invention, in the automobile suspension cross member structure according to the fourth aspect, the connecting plate has a rear end portion welded to the rear cross member body, and a front end portion of each side portion is a front cross member. The member body is detachably bolted.

  The present invention is a specific configuration of the connecting plate, wherein the rear end portion is welded to the rear cross member main body and the front end portion is bolted to the front cross member main body, so that the connecting plate is attached and detached together with the rear cross member. it can. In addition, the input load from the suspension arm and the impact load at the time of collision, such as the input load from the power unit, can be efficiently distributed over a wide area of the front cross member and the rear cross member, and can be efficiently transmitted to the front side frame. it can.

  According to the present invention, since the suspension cross member includes the front cross member and the rear cross member that is detachably fastened to the front cross member, the rigidity of the suspension cross member can be secured, and the front cross member By arranging the rear cross member in close proximity, the size and weight can be reduced.

  Also, by separating the rear cross member from the front cross member, a sufficient working space can be secured on the rear side of the front cross member, and work such as attachment / detachment, maintenance and inspection of the power unit and mounting equipment becomes easy. , The burden on the operator can be reduced.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an automobile suspension cross member structure according to the present invention will be described below with reference to FIGS. In each figure, an arrow F indicates the vehicle body front direction.

  FIG. 1 is a schematic plan view showing an outline of a front part of a vehicle body. A suspension cross member 10 extends in the vehicle width direction between left and right front side frames 1 extending in the vehicle longitudinal direction along both sides of an engine room E. It is erected. The suspension cross member 10 includes a front cross member 11 and a rear cross member 41 that extend in the vehicle width direction, and suspension support portions 31 that support the base end of the suspension arm 3 of the suspension device are formed at both ends.

  The engine portion of the vertical power unit 5 in which the transmission 7 is disposed behind the engine 6 is supported via engine mount brackets 14A and 14B provided in the center of the front cross member 11, and the drive shaft Power is transmitted to the front wheels via 4. Furthermore, a stabilizer 9 extending in the vehicle width direction is supported on the front portion of the front cross member 11 via a bracket 28. A steering gear box 8 of the steering device is attached to the rear portion of the rear cross member 41 via a gear box mount bracket 47.

  Next, the suspension cross member 10 including the front cross member 11 and the rear cross member 41 will be described. 2 is a perspective view of the suspension cross member 10 from obliquely upward and backward, FIG. 3 is a perspective view of the suspension cross member 10 from obliquely downward and forward, FIG. 4 is an enlarged view of portion A in FIG. 2, and FIG. 11 is a perspective view showing a state where 11 and the rear cross member 41 are separated. Since the suspension cross member 10 is substantially symmetrical with respect to the center of the vehicle body, one of the end structures of the suspension cross member 10 will be mainly described, and detailed description of the other will be omitted.

  The front cross member 11 extends substantially linearly with an upper surface 12A and a front surface 12B and a rear surface 12C that are bent downward from the front edge and rear edge of the upper surface 12A. The upper panel 12 that smoothly rises and extends in the vehicle width direction as it moves from the center to the both ends, and extends between the lower end of the front surface 12B and the lower end of the rear surface 12C of the upper panel 12 and extends in the vehicle width direction. A front cross member main body 11A formed in a hollow shape by the existing lower panel 13 is provided.

  At the vehicle width direction end of the upper surface 12 </ b> A of the upper panel 12, a mounting portion 12 </ b> D that overlaps from below is formed on the front mounting portion 1 </ b> D formed on the front side frame 1. A mounting hole 12Da penetrating in the vertical direction is formed in the mounting portion 12D.

  A pair of engine mount brackets 14A, 14B are provided in the vicinity of the center portion of the upper surface 12A of the upper panel 12 so as to be spaced apart from each other in the vehicle width direction, and a pair of connecting plate coupling portions 13A, 13B provided with nuts in the vicinity of the center portion of the lower panel 13 Are spaced apart in the vehicle width direction.

  The end structure of the front cross member 11 will be described with reference to FIGS. 6 is a view as viewed from arrow B in FIG. 4, FIG. 7 is a view as viewed from arrow C in FIG. 5, FIG. 8 is a view as viewed from arrow D in FIG. It is a perspective view.

  At the end of the front cross member 11 are a first suspension support bracket 21, a second suspension support bracket 22, a rear mounting bracket 23, an upper connection bracket 24, and a lower connection bracket 25, which are suspension support brackets having a relatively simple shape. , A bracket structure 20 formed by an inner connecting panel 26, a stabilizer mounting bracket 27, and a front side mounting bracket 29. The bracket structure 20 forms a first support portion 32 and a front attachment portion 33 for attaching the front cross member 11 to the front side frame 1 to be connected to the suspension support portion 31 and the rear cross member 41.

  The first suspension support bracket 21 has a base portion 21A extending in the vehicle width direction and a substantially L-shaped cross section provided with an outer surface portion 21B bent forward from the outer edge portion of the base portion 21A in the vehicle width direction. A sheet metal member integrally formed with a flange portion 21 </ b> C extending in the vertical direction and continuously extending in the vehicle width direction from the front end edge of the outer side surface portion 21 </ b> B. The upper panel 12 is coupled to the rear surface 12C. Further, a first suspension mounting portion 21D having a mounting hole 21Da penetrating in the front-rear direction is formed near the lower end of the base portion 21A. The width of the base portion 21 in the vehicle width direction gradually increases as it shifts from the first suspension mounting portion 21D formed at the lower portion to the upper portion that is coupled to the rear surface 12C of the upper panel 12 to secure the coupling length of the upper panel 12 and the upper panel 12. The joint rigidity is secured.

  The second suspension support bracket 22 includes a base portion 22A that faces the base portion 21A of the first suspension support bracket 21 and an outer surface portion 22B that is bent forward from the outer edge of the base portion 22A in the vehicle width direction. The upper mounting portion 22C is L-shaped and is continuous in the vertical direction, and is integrally formed with an upper mounting portion 22C that is bent at the upper end of the base portion 22A at the rear of the vehicle body and has a vertical mounting hole 22Ca. A service hole 22Aa is opened near the lower end of the base 22A.

  Further, a rear mounting provided with a lower mounting portion 23C provided with a mounting hole 23Ca formed in the vertical direction intermediate portion of the base portion 22A of the second suspension support bracket 22 so as to be opposed to the upper mounting portion 22C and penetrated in the vertical direction. A bracket 23 is attached. A U-shaped first support portion 32 having a rear opening is formed by the upper mounting portion 22C of the second suspension support bracket 22 and the lower mounting portion 23C of the rear mounting bracket 23.

  The upper connecting bracket 24 has a base portion 24A continuous in the vehicle width direction with a substantially U-shaped cross section with the upper portion opened, and a flange portion 24B formed along the front edge portion of the base portion 24A has a rear surface 12C of the upper panel 12. And the upper part of the first suspension support bracket 22. A mounting portion 24C that is coupled to the upper surface of the upper mounting portion 22C of the second suspension support bracket 22 at the rear edge of the base portion 24A and that can be overlapped with the lower surface of the cross member support bracket 66 provided on the front side frame 1 is bent. Is formed. An attachment hole 24Ca corresponding to the attachment hole 22Ca formed in the upper attachment portion 22C of the second suspension support bracket 22 is formed in the attachment portion 24C.

  Further, an outer surface portion 24D coupled to the outer surface portion 21B of the first suspension support bracket 21 is bent at the vehicle width direction edge front portion of the base portion 24A, and the first suspension is formed at the vehicle width direction edge front portion of the base portion 24A. The outer surface portion 24E coupled to the outer surface portion 21B of the support bracket 21 is bent. The upper connection bracket 24 connects the upper portion of the first suspension support bracket 21 and the upper portion of the second suspension support bracket 22.

  The lower connection bracket 25 is bent downward along the edge of the outer surface 22B of the second suspension support bracket 22 from the base 25A facing the lower surface of the base 24A of the upper connection bracket 24 and the rear edge of the base 25A. A second suspension mounting portion 25B having a mounting hole 25Ba formed facing the first suspension mounting portion 21D formed in the base portion 21A of the first suspension support bracket 21, and a lower edge of the second suspension mounting portion 25B The lower end portion 25 </ b> C that is bent rearward and coupled to the lower end of the second suspension support bracket 22 is continuously formed.

  Further, an outer surface 24D of the upper coupling bracket 24 and an outer surface 25D coupled to the outer surface 21B of the first suspension support bracket 21 are bent at the outer edge in the vehicle width direction of the base 25A, and the second suspension mounting portion 25B is bent. A coupling flange portion 25E that is coupled to the outer surface portion 22B of the second suspension support bracket 22 is bent at the edge portion. Further, an inner coupling flange 25F that is coupled to a lower edge of a base portion 26A of the inner connection panel 26 described later is bent at the inner edge in the vehicle width direction of the base portion 25A. As a result, the second suspension mounting portion 25B is provided at the lower end of the second suspension support bracket 22, and the lower portion of the first suspension support bracket 21 and the lower portion of the second suspension support bracket 22 are connected by the lower connection bracket 25. Is done.

  As shown in FIG. 7, the inner connection panel 26 includes a rectangular flat plate-like base portion 26 </ b> A and a cross member coupling portion 26 </ b> B that extends from the front edge of the base portion 26, and the rear edge 26 </ b> Aa of the base portion 26 </ b> A is the second suspension support bracket 22. The lower edge 26Ab is coupled to the inner coupling flange 26F of the lower coupling bracket 25, the front edge 26Ac is coupled to the lower part of the base 21A of the first suspension support bracket 21, and the cross member coupling portion 26B is coupled to the lower portion of the base 22A. The lower edge of the front surface 12B and the rear surface 12C and the lower panel 13, that is, the cross member main body 11A are coupled. As a result, the vehicle body in the vehicle width direction of the front link bracket 21, the vehicle width direction inner portion of the rear link bracket 22, the front cross member main body 11 </ b> A, and the inner connection panel 26 are firmly connected to each other. The rigidity of the support bracket 22 is improved.

  The stabilizer mounting bracket 27 has an upper edge coupled to the front surface 12B of the upper panel 12 and hangs down, and gradually descends as the lower edge moves outward in the vehicle width direction. It has a substantially triangular flat base 27 </ b> A that extends. A stabilizer mounting portion 27B is formed to bulge forward in the vicinity of the edge of the base portion 27A, and the stabilizer 9 is supported by the stabilizer mounting portion 27B via a bracket 28.

  The front mounting bracket 29 is folded along a flat base portion 29A extending in the vertical direction between the flange portion 21C of the first suspension support bracket 21 and the base portion 27A of the stabilizer mounting bracket 27, and the front edge of the base portion 29A. A flange 29B that is bent and joined to the base 27A of the stabilizer mounting bracket 27; a flange 29C that is bent along the rear edge of the base 29A and joined to the flange 21C of the first suspension support bracket 21; A mounting portion 12D formed on the upper panel 12 by bending outward from the upper end of the base portion 29A and a mounting portion 29D opposed to each other in the vertical direction are integrally formed. An attachment hole 29Da formed in the attachment portion 12D of the upper panel 12 and corresponding to the attachment hole 12Da is formed in the attachment portion 29D.

  A cross member front mounting portion 33 is formed by the mounting portion 12D of the outer panel 12 and the mounting portion 29D of the front mounting bracket 29.

  The front cross member 11 formed in this way is provided with an engine mount bracket 14 on the upper surface of the central portion and a connecting plate coupling portion 13A, 13B on the lower surface by the upper panel 12 and the lower panel 13, so that the rigidity extends in the vehicle width direction. An excellent hollow front cross member main body 11A is formed.

  By connecting the first suspension support bracket 21 and the second suspension support bracket 22 to the end portion of the front cross member main body 11A with the upper connection bracket 24 and the lower connection bracket 25, the front cross member main body 11A is moved downward. A suspension support portion 31 that supports the base end of the suspension arm 4 is formed by the first suspension attachment portion 21D of the offset first suspension support bracket 21 and the second suspension attachment portion 25B of the lower connection bracket 25. Furthermore, the flange portion 21C of the first suspension support bracket 21 and the flange portion 29C of the front mounting bracket 29 coupled to each other ensure continuous rigidity between the first suspension mounting portion 21D and the mounting portion 29C of the front mounting bracket 29. Ribs 35 are formed. The rib 35 serves as a load transmission path for efficiently transmitting a load from the first suspension attachment portion 21 to the attachment portion 29C.

  A drive shaft installation space through which the drive shaft 4 extending in the vehicle width direction passes is secured on a U-shaped base portion 24A that is continuous in the vehicle width direction in a substantially U-shaped cross section of the upper connection bracket 24.

  Further, the lower portion of the base portion 22A of the second suspension support bracket 22, the inner coupling flange 26F of the lower connection bracket 25, and the lower portion of the base portion 21A of the first suspension support bracket 21 are connected to each other by the base portion 26A of the inner connection panel 26, and The member coupling portion 26B is coupled to the cross member main body 11A, and the deformation of the first suspension support bracket 21, the second suspension support bracket 22, the upper connection bracket 24, and the like is constrained, and the first suspension support bracket 21 and the second suspension support bracket. 22 are firmly connected. Further, the axial load input from the suspension arm 4 to the suspension support portion 31 can be reliably received. Further, the coupling rigidity between the first support portion 32 and the front cross member main body 10A formed by the upper mounting portion 22C of the second suspension support bracket 22 and the lower mounting portion 23C of the rear mounting bracket 23 can be ensured.

  As shown in FIGS. 1 to 5, the rear cross member 41 smoothly rises in the vehicle width direction as it moves from the central portion extending in a substantially straight shape with a U-shaped cross-section with the front open to both ends. The rear panel 42 that extends and the front panel 43 that extends in the vehicle width direction by fitting and coupling with the rear cross member 41 in a U-shaped cross section with the rear open are formed in a hollow cross section. A rear cross member main body 41A is provided. A steering gear box 8 extending in the vehicle width direction is attached to the rear portion of the rear cross member main body 41A via a gear box mount bracket 47.

  A second support portion 45 formed by a tube 46 is provided at an end portion of the rear cross member main body 41A. The tube 46 has an insertion hole 46 a penetrating in the up-down direction, and the lower mounting bracket 22 C of the second suspension support bracket 22 that forms the side structure 20 of the front cross member 11 and the lower side of the rear mounting bracket 23. It is formed by a cylindrical member having an axial length that fits between the rear mounting portions 23C. The first support member 32 of the front cross member 11 and the cross member joined together to the rear mounting portion 1E of the front side member 1 by the first support member 32 and the second support portion 45 of the rear cross member 41 are fitted together. A rear mounting portion 36 is formed.

  A connecting plate 51 is attached to the center of the lower surface of the rear cross member main body 41A. As shown in FIG. 3, the connecting plate 51 is substantially H-shaped or X-shaped in plan view in which the intermediate portions of a pair of side portions 51A and 51B extending in the front-rear direction are connected. Rear attachment portions 51C and 51D formed at the respective rear end portions are welded to the lower surface of the rear cross member main body 41A. Front mounting portions 51E and 51F each having a mounting hole drilled corresponding to the connecting plate coupling portions 13A and 13B formed on the lower surface of the front cross member 11 are formed at the front ends of the side portions 51A and 51B. Yes. The front mounting portions 51E and 51F and the rear mounting portions 51C and 51D of the connecting plate 51 formed in an H shape or an X shape in plan view are formed in an X shape in plan view that intersects as shown by phantom lines in FIG. Be placed.

  Next, the attachment structure for attaching the cross member front attachment portion 33 and the cross member rear attachment portion 36 of the sub cross member 10 to the front side member 1 will be described.

  The front mounting portion 1D of each front side frame 1 has an upper side surface 1A, an inner side surface 1B, and a lower side surface 1C as shown in FIG. The upper flange 1a and the lower flange 1b are joined to the inner surface of the wheel apron 2 that forms a cross section and extends in the front-rear direction in a substantially hat-shaped cross section. A reinforcement 61 having a U-shaped cross section having 61A, an inner side surface 61B, and a lower side surface 61C is disposed. Through holes 1Ca and 61Ca are formed in the lower side surfaces 1C and 61C of the front side frame 1 and the reinforcement 61, respectively.

  A cylindrical flanged bushing 62 is inserted into the mounting hole 12Da of the mounting portion 12D of the upper panel 12 of the front cross member 11 from above, and the tip thereof is positioned in contact with the mounting portion 28D of the front mounting bracket 28. On the other hand, a cylindrical nut 63 is arranged between the lower side surface 1C and the upper side surface 1A of the front side frame 1, more specifically between the lower side surface 61C and the upper side surface 61A of the reinforcement 61.

  The nut is inserted from below through the mounting hole 28Da formed in the mounting portion 28D of the front mounting bracket 28 and passes through the through hole 62a of the bush 62, the front side frame 1, and the through holes 1Ca and 61Ca of the reinforcement 61. The front cross member 11 is fastened to the front mounting portion 1 </ b> D of the front side frame 1 by mounting bolts 65 that are screwed onto 63.

  Thus, the front mounting portion 33 attached to the front mounting portion 1D of the front side frame 1 is a cylindrical bush interposed between the lower surface 1C of the front side frame 1 and the mounting portion 29D of the front mounting bracket 29. The front mounting bracket 29 is firmly coupled to the front side frame 1 through 62. Further, a cylindrical nut 63 is arranged between the lower side surface 61C and the upper side surface 61A of the reinforcement 61, and the deformation of the front mounting portion 1D of the front side frame 1 is constrained to be restricted. The coupling rigidity between the frame 1 and the front mounting portion 33 can be ensured.

  The rear mounting portion 1E of the front side frame 1 has a first bracket 67 in which through holes 67a and 68a are formed in the lower side surface 1C of the front side frame 1 as shown in the sectional view taken along the line II-II in FIG. And a cross member support bracket 66 including a second bracket 68 is provided. A nut 69 is disposed on the upper surface of the first bracket 67 corresponding to the through hole 67a.

  On the other hand, the second cross member 41 of the rear cross member 41 is interposed between the upper mounting portion 22C of the second suspension support bracket 22 and the lower mounting portion 23C of the rear mounting bracket 23, which form the first support portion 32 of the front cross member 11. A tube 46 forming the support 45 is fitted and arranged.

  And it inserts from the attachment hole 23Ca drilled in the lower attachment portion 23C from below, the insertion hole 46a of the tube tube 46, the attachment hole 22Ca formed in the upper attachment portion 22C, and the attachment portion 23C of the upper connection bracket 24. The first support portion 32 and the rear cross member of the front cross member 11 are attached by mounting bolts 70 that are fasteners that pass through the mounting holes 23Ca and the through holes 67a of the first bracket 67 and are screwed into the nuts 69. Both of the second support portions 34 of the 41 are fastened to the rear mounting portion 1E of the front side frame 1.

  The cross member rear attachment portion 36 attached to the rear attachment portion 1E of the front side frame 1 in this way is provided with an attachment hole 23Ca formed in the lower attachment portion 23C of the rear attachment bracket 23 and an insertion hole for the tube 46. 46a, an attachment hole 22Ca formed in the upper attachment portion 22C of the second suspension support bracket 22, an attachment hole 23Ca formed in the upper attachment portion 23C of the upper connection bracket 24, and a through hole 67a of the first bracket 67. Since the mounting bolt 70 and the nut 69 that pass through are fastened together, the deformation of the first support portion 32 and the second support portion 45 is restrained, and the front cross member 11 and the rear cross member 41 are firmly coupled to each other. Fastened to the rear mounting portion 1E of the front side frame 1 through the cross member support bracket 66.

  Further, the front plate mounting portions 51E and 51F of the connecting plate 51 in which the rear end mounting portions 51C and 51D are connected to the lower surface of the rear cross member 41 are connected to the connecting plate connecting portions 13A and 13B formed on the lower surface of the front cross member 10. To polymerize. Then, the front cross member 10 is inserted into the front mounting portions 51E and 51F of the connecting plate 51 from below by means of mounting bolts 71 that are inserted into mounting holes drilled in the connecting and connecting portions 13A and 13B. The front mounting portions 51E and 51F of the connecting plate 51 are coupled to the lower surface of the connecting plate 51.

  Thus, the front cross member 10 and the rear cross member 41 that extend in the vehicle width direction and are supported at both ends by the left and right front side frames 1 are provided. The front cross member 10 and the rear cross member 41 are connected to each other. A front suspension cross member 10 connected by 51 is formed.

  The engine 6 is supported via a pair of engine mounts 14A and 14B provided at the center of the front cross member main body 11A, and the power unit 5 is mounted. Further, the base end of the suspension arm 3 is attached to the suspension support portion 31 constituted by the first suspension attachment portion 21D of the first suspension support bracket 21 and the second suspension attachment portion 25B of the lower connection bracket 25. The suspension arm 3 is attached by setting an elastic bush provided at the base end of the suspension arm 3 between the first suspension attachment portion 21D and the second suspension attachment portion 25B, and attaching the attachment hole 21Da of the first suspension attachment portion 21D. The nut is screwed with a tightening tool inserted from the service hole 22Aa of the second suspension support bracket 22 into the mounting bolt that passes through the elastic bush and protrudes from the mounting hole 25Ba of the second suspension mounting portion 25B. Attached by.

  Similarly, the stabilizer 9 is attached to the front portion of the front cross member 11 via a bracket 28. Further, the steering gear box 8 is attached to the rear portion of the rear cross member 41 through the gear box mount bracket 47 so as to extend in the vehicle width direction. The stabilizer 9 and the steering gear box 8 are provided with brackets 28 on the front side of the front cross member 11 and the rear side of the rear cross member 41, in which the dimensions of the suspension cross member 10 in the front-rear direction are suppressed and a relatively easy working space can be secured. Since it is attached via the gear box mount bracket 47, it is excellent in detachability and can be easily maintained such as replacement and repair. Moreover, it can replace | exchange for the stabilizer 9 and the steering gear box 8 from which specifications differ.

  In the suspension cross member 10 configured in this manner, the front mounting portion 33 of the front cross member 11 is connected to the front mounting portion 1D of the front side frame 1 on the lower surface 1C of the front side frame 1 and the mounting portion of the front mounting bracket 29. An upper mounting portion 22C and a lower mounting portion 23C, which are firmly fastened by mounting bolts 65 and nuts 63 via a cylindrical bush 62 interposed between 29D and form the first support portion 32 of the front cross member 11. The cross is provided on the rear mounting portion 1E of the front frame 1 by means of a mounting bolt 70 and a nut 76, which is fitted into a tube 46 having a sufficient rigidity to form the second support portion 45 of the rear cross member 41. Since the member support bracket 66 is fastened, the coupling rigidity between the first support portion 32 and the second support portion 45 and the first support portion 32 are provided. Further, the coupling rigidity between the second support part 45 and the front side member 1 can be ensured, and the front cross member 11 and the rear cross member 41 are coupled via a coupling plate 51, whereby the rigidity of the suspension cross member 10 and the suspension cross. The coupling rigidity between the member 10 and the front side frame 1 is ensured.

  In addition, by disposing the steering gear box 8 behind the rear cross member 41, the front cross member 11 and the rear cross member 41 are disposed close to each other so that the size of the suspension cross member 10 in the front-rear direction can be suppressed. The cross member 10 can be reduced in size and weight.

  Further, the connecting plate 51 that connects the lower surfaces of the front cross member 11 and the rear cross member 41 suppresses the vibration of the suspension cross member 10 as a whole, and from the pebbles that scatter the power unit 5 and the mounting device, particularly the transmission 7. Functions as a protective cover to protect.

  Further, the suspension arm 3 is mainly extended from the suspension arm 3 to the suspension support portion 31 of the vehicle body side body 20 due to traveling or the like, that is, the vehicle width direction is inclined so as to rise from the outside to the inside. The external force is distributed and input to the first suspension mounting portion 21D of the first suspension support bracket 21 and the second suspension mounting portion 25B of the lower connection bracket 25 that form the suspension support portion 31. The front cross member via the bracket structure 20 constituted by the first suspension support bracket 21 and the second suspension support bracket 23, etc., whose deformation is restrained by the inner connection panel 26, the lower connection bracket 25, the upper connection bracket 24, etc. 11 and the rear cross member 41 It is reliably received by the front side frame 1 of the left and right.

  Specifically, the external force from the suspension arm 3 input to the first suspension mounting portion 21D is mainly transmitted through the first suspension support bracket 21 and the front mounting bracket 29 coupled to the first suspension support bracket 21 to the upper panel. 12 and the front cross member mounting portion 33, and distributed and transmitted from the front cross member mounting portion 33 to the front mounting portion 1 </ b> D of the front side frame 1 and efficiently received by the front side frame 1. Further, it is transmitted from the upper panel 12 to the front cross member 11 and the front cross member 11 via the connecting plate 51 to the rear cross member 41 and is distributed and transmitted over a wide range of the left and right front side frames 1 via the suspension cross member 10. Is done.

  In particular, the first suspension mounting portion 21D and the mounting portion 29D are coupled to each other by joining the flange portion 21C of the first suspension support bracket 21 having the first suspension mounting portion 21D formed at the lower end portion and the flange portion 29C of the front mounting bracket 29. The load input to the first suspension mounting portion 21 is directly transmitted to the front mounting portion 33 by using the ribs 35 continuously formed therebetween as a load transmission path, and is efficiently received by the front side frame 1.

  On the other hand, the input load from the suspension arm 3 input to the second suspension mounting portion 25B is mainly the upper portion of the second suspension support bracket 22 via the second suspension support bracket 22 provided with the second suspension mounting portion 25B. The first support portion 32 and the second support portion 45 formed on the first side support portion 36 are transmitted from the rear mounting portion 36 to the rear side mounting portion 1E of the front side frame 1 and are received by the front side frame 1 and are coupled to each other. It is distributed and transmitted to the front cross member 11 and the rear cross member 41 through the first support portion 32, the second support portion 45, and the connecting plate 51, and is distributed and received in a wide range of the left and right front side frames 1.

  On the other hand, when an external force, that is, an impact load is input to the power unit 5 from the front of the vehicle body due to a frontal collision or the like, the external force is transmitted to the front cross member 11 from the engine mount brackets 14A and 14B that support the power unit 5, and the front cross In addition to being distributed and transmitted from the front mounting portions 33 at both ends of the member 11 to the left and right front side frames 1, it is also transmitted to the rear cross member 41 through the connecting plate 51 and from the respective cross member rear mounting portions 36 to the left and right. The power unit 5 can be efficiently retracted by being distributed and transmitted to the front side frame 1. In particular, the front mounting portions 51E and 51F that form the connecting plate 51 in an H shape or X shape in plan view and are connected to the front cross member 11 and the rear mounting portions 51C and 51D that are connected to the rear cross member 41 are shown in FIG. By arranging them in an X-shape that intersects with each other as indicated by imaginary lines, even when the external force P2 is input to the power unit 5 with an offset from the front, it is efficient over a wide area from the front cross member 11 to the rear cross member 41. Can be distributed and transmitted.

  Next, an operation for detaching the transmission 7 of the power unit 5 in maintenance and inspection will be described.

  The removal work of the transmission 7 is performed by removing the mounting bolts 71 that fasten the front mounting portions 51E and 51F of the connecting plate 51 to the front cross member main body 11A to remove the front from the front mounting portions 51E and 51F of the connecting plate 51. The connecting plate coupling portions 13A and 13B of the cross member 11 are separated.

  Also, the first support portion 32 of the front cross member 11 and the second support portion 45 of the rear cross member 41 are fastened together with a cross member support bracket 66 provided on the rear mounting portion 1E of the front side frame 1. The bolt 70 is removed and the fastening of the front side frame 1, the first support part 32, and the second support part 45 is released. And the tube 46 of the 2nd support part 45 provided in the edge part of the rear cross member 41 is extracted from between the upper attachment part 22C and the lower attachment part 23C of the 1st support part 32, and the rear cross member 41 is removed. Remove. By removing the rear cross member 41, a sufficient working space is secured on the rear side of the front cross member 11.

  Then, in a state where the engine 6 is supported by the front cross member 11 via the engine mount brackets 14A and 14B, a mounting bolt (not shown) that couples the engine 6 and the transmission 7 is removed to remove the transmission from the engine 6. 7 is separated. The transmission 7 separated from the engine 6 is carried out below the engine room E from the rear side of the front cross member 11 from which the rear cross member 41 is removed and a work space is secured.

  On the other hand, when the transmission 7 is mounted, the rear cross member 11 is removed and the transmission 7 is carried into the engine room E from the work space secured behind the front cross member 41 and supported by the front cross member 11. The transmission 7 is attached to the engine 11 and fastened with a mounting bolt.

  Then, a tubular tube 46 that forms the second support portion 45 of the rear cross member 41 is inserted between the upper mounting portion 22C that forms the first support portion 32 of the front cross member 11 and the lower mounting portion 23C. Match. Further, the mounting bolt 70 is inserted from the mounting hole 23Ca formed in the lower mounting portion 23C, and the insertion hole 46a of the tube 46, the mounting hole 22Ca formed in the upper mounting portion 22C, and the upper connection bracket 24 The first support portion 32 of the front cross member 11 and the second support of the rear cross member 41 are fastened to the nut 69 through the mounting hole 23Ca formed in the mounting portion 23C and the through hole 67a of the first bracket 67. The portions 34 are attached to the rear cross member attaching portion 1E of the front side frame 1 together.

  Thereafter, the front mounting portions 51E and 51F of the connecting plate 51 are fastened to the connecting plate connecting portions 13A and 13B of the front cross member 11 by mounting bolts 71.

  The transmission 7 is detached from the engine 6 supported by the front cross member 11 in a state where the rear cross member 11 is detached and a working space is secured behind the front cross member 41, and Since the transmission 7 is carried out and carried in from the engine room E from the rear of the front cross member 11 where the rear cross member 41 is removed and the working space is secured, the transmission 7 can be easily attached and detached. The burden is greatly reduced.

  Further, by removing the rear cross member 41 and securing a working space behind the front cross member 11 to replace and maintain the steering gear box 8 and other mounting devices, the burden on the worker is greatly reduced. can do.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, in the above embodiment, the rear cross member 41 is formed in a hollow shape by the rear panel 42 and the front panel 43, but may be formed by a pipe or the like. Further, although the first support portion 32 and the second support portion 45 are coupled to the rear mounting portion 1E of the front side frame 1 through the cross member support bracket 66, the first support portion 32 and the second support portion 45 are directly connected without the cross member support bracket 66 being interposed. It can also be coupled to the rear surface mounting portion 1E.

1 is a schematic plan view of a front portion of a vehicle body provided with a suspension cross member according to an embodiment of the present invention. It is a perspective view from the upper diagonal rear of a suspension cross member. FIG. 3 is a perspective view of a suspension cross member from a lower diagonal front. It is the A section enlarged view of FIG. It is a perspective view of a suspension cross member in a state where a front cross member and a rear cross member are separated. It is a B arrow view of FIG. It is C arrow line view of FIG. It is D arrow line view of FIG. It is E arrow line view of FIG. It is a disassembled perspective view. It is the II sectional view taken on the line of FIG. It is the II-II sectional view taken on the line of FIG.

Explanation of symbols

1 Front side frame 1D Front mounting part 1E Rear mounting part 3 Suspension arm (suspension device)
5 Power unit 6 Engine 7 Transmission 8 Steering gear box 10 Suspension cross member 11 Front cross member 11A Front cross member main body 12 Upper panel 12D Mounting portion 13 Lower panel 13A, 13B Connecting plate coupling portion 20 Bracket structure 21 First suspension support bracket (Suspension support bracket)
21C Flange portion 21D First suspension attachment portion 22 Second suspension support bracket 22C Upper attachment portion 23 Rear attachment bracket 23C Lower attachment portion 24 Upper connection bracket 25 Lower connection bracket 25B Second suspension attachment portion 26 Inner connection panel 29 Front attachment Bracket 29C Flange 29D Attachment 31 Suspension support 32 First support 33 Front attachment 35 Rib 36 Cross member rear attachment 41 Rear cross member 41A Rear cross member main body 45 Second support 46 Tube 47 Gear box mount Bracket 51 Connecting plate 51A, 51B Side portion 51C, 51D Rear mounting portion 51E, 51F Front mounting portion 65 Mounting bolt 66 Cross member support bracket 67 First bracket 70 Mounting bolt (fastener)

Claims (5)

In the suspension cross member structure that extends in the vehicle width direction and each end is supported by the left and right front side frames to support the power unit and the suspension device,
A front cross member provided with a front attachment portion and a first support portion attached to and supported by the left and right front side frames at each end;
A rear cross member provided with a second support portion that is separably fastened to the first support portion at each end at the rear of the vehicle body from the front cross member;
A suspension cross member structure for an automobile, comprising: The first support portion includes an upper attachment portion and a lower attachment portion that are opposed to each other with an attachment hole penetrating in the vertical direction in a U-shaped cross section.
The second support portion includes a tube tube that is fitted between the upper mounting portion and the lower mounting portion of the opposing first support portion and has an insertion hole that penetrates in the vertical direction.
A fastener for penetrating the mounting holes of the upper mounting portion and the lower mounting portion and the insertion hole of the tube and fastening the first support portion and the second support portion to the left and right front side frames is provided. The suspension cross member structure for an automobile according to claim 1. A first suspension support bracket having an upper end coupled to the front cross member body and a lower end provided with a first suspension mounting portion;
A second suspension mounting portion that extends in the vertical direction facing the first suspension support bracket and supports the suspension arm of the suspension device in cooperation with the first suspension mounting portion is provided at the lower portion, and the upper mounting portion at the upper portion. A second suspension support bracket formed with
A rear mounting bracket coupled to the second suspension support bracket and formed with the lower mounting portion facing the upper mounting portion;
An upper connection bracket connecting the upper portion of the first suspension support bracket and the upper portion of the second suspension support bracket;
A lower connection bracket connecting the lower portion of the first suspension support bracket and the lower portion of the second suspension support bracket;
The vehicle interior of the said 1st suspension support bracket is provided with the inner side connection panel which connects the vehicle width direction inner side part of the 2nd suspension support bracket, the vehicle width direction inner side part, and the front side cross member main body. Automobile suspension cross member structure.   The suspension cross member structure for an automobile according to any one of claims 1 to 3, further comprising a connecting plate for detachably connecting the front cross member main body and the rear cross member main body. The connecting plate is
5. The suspension cross member structure for an automobile according to claim 4, wherein a rear end portion is welded to the rear cross member main body, and a front end portion of each side portion is detachably bolted to the front cross member main body. .

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