JP4580532B2 - Suspension mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a suspension mounting structure in which both ends of a suspension cross member are joined to the lower surfaces of a pair of left and right frames extending in the longitudinal direction of a vehicle body.
[0002]
[Prior art]
Conventionally, in a vehicle such as an automobile, both ends of a suspension cross member (or suspension subframe) are joined and fixed to the lower surfaces of a pair of left and right frames extending in the longitudinal direction of the vehicle body as a suspension mounting structure for a vehicle body of a wheel equipped with tires. In many cases, a wheel supported so as to be swingable with respect to the suspension cross member is buffered by a strut constituting a damper interposed between the wheel and the vehicle body. FIG. 6 is a typical example of such a strut type suspension mounting structure. Briefly, as shown in FIG. 6 (A), the lower surfaces of a pair of left and right frames 1 extending in the longitudinal direction of the vehicle body (the one shown is an example of a rear suspension mounting structure, and both sides of the floor 4 of the rear trunk room). Both ends of the suspension cross member 3 are joined to the lower surface of the side frame 1 formed by recessing 1A as shown in FIG.
[0003]
A wheel housing 20 having a fulcrum in the vicinity of both end portions of the suspension cross member 3 and having a tire T mounted thereon by a lateral link 17 and the like so as to be swingable up and down is disposed. A damper is provided between the wheel housing 20 and the vehicle body. The strut 8A which comprises is comprised, and it is comprised so that the impact from the road surface via the tire T, etc. may be buffered. As shown in FIG. 6 (B), the suspension cross member 3 is joined to the frame 1 by attaching mounting bolts 25 inserted from below through the mounting cylinders 3D at both ends of the suspension cross member 3. The welding nut 19 fixed in the recessed portion 1A of the frame 1 is screwed and tightened.
[0004]
[Problems to be solved by the invention]
However, in such a conventional structure, both ends of the suspension cross member 3 are firmly attached to the vehicle body frame by a plurality of attachment bolts 25, but the attachment bolts 25 are recessed portions 1A in the frame 1. Since it is only screwed and tightened to the welding nut 19 fixed inside, the lateral force acting on the suspension cross member 3 must be borne in the vicinity of the welding nut 19 portion. Rather, they had to deal with these forces with almost no vertical span. In addition, the suspension cross member 3 is constantly subjected to an impact input from the suspension and is subjected to torsion and bending force during traveling. For this reason, a complicated force acts on each of the mounting bolts 25. On the other hand, for mounting bolts that are often attached to various parts of the vehicle body, the mounting portion rigidity is not necessarily equivalent, and the suspension cross member that receives a complex force during traveling loses the balance of each mounting portion, There is a possibility that the suspension cross member is elastically deformed to cause an alignment change which is unfavorable for maintaining the steering stability performance even if very little.
[0005]
Therefore, the present invention solves such a problem of the conventional suspension mounting structure, and improves the rigidity of the mounting portion and the suspension cross member by only a few additional configurations without modifying the conventional structure, It is an object of the present invention to provide a suspension mounting structure that prevents relative displacement between mounting bolts and does not cause undesirable alignment changes.
[0006]
[Means for Solving the Problems]
Therefore, the present invention relates to a suspension cross member that is disposed on a vehicle floor and a pair of left and right frame lower surfaces provided on the lower surface of the floor and extending in the longitudinal direction of the vehicle body at a distance of the floor and substantially the height of the frame. In the suspension mounting structure in which both end portions of each are joined, stiffening that connects the pair of left and right frames horizontally mounted on the upper surface of the floor by mounting bolts extending from the suspension cross member to the upper surface of the floor through the frame. The member is fastened together with the suspension cross member, and the stiffening member is configured to be fixed to the floor at least near the center of the vehicle body . The present invention also provides a suspension cross member disposed on a vehicle floor and a pair of left and right frames provided on the lower surface of the floor and extending in the front-rear direction of the vehicle body at a distance corresponding to the height of the floor and the frame. In the suspension mounting structure in which both ends are joined to each other, a slant bar with the other end fixed to the top of the strut tower is fastened together with the suspension cross member by mounting bolts extending from the suspension cross member through the frame to the upper surface of the floor. while being characterized by a pair of left and right intersections of the inclined bar is configured so that are fixed to each other. Further, the present invention is characterized in that the stiffening member horizontally mounted on the upper surface of the floor is configured to be fastened together with the suspension cross member and the inclined bar. Also, the present invention provides a plurality of joint points to the frame at both ends of the suspension cross member in the longitudinal direction of the vehicle body, and front and rear joints connecting these joints are formed at both ends of the stiffening member and the inclined bar. The mounting rigidity of the suspension cross member can be achieved simply by adopting a simple additional configuration in which the mounting bolts to the frame of the suspension cross member are extended to the upper surface of the floor and these are tightened together with the stiffening member. As a result, the rigidity of the suspension cross member is remarkably improved, and the relative displacement between the mounting bolts is prevented, thereby preventing an undesirable change in alignment.
[0007]
Embodiment
Embodiments of the suspension mounting structure of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of a suspension mounting structure according to the present invention, FIG. 1 is a rear view of a main part, FIG. 2 is an enlarged view of part A of FIG. 1, and FIG. 3 is a suspension cross member and a stiffening member. FIG. 4 is an explanatory view of an action state of a force to each part of the suspension.
As shown in FIG. 1, the suspension mounting structure of the present invention has a suspension cross member 3 on the lower surface of a pair of left and right frames 1 and 2 (refer to FIG. 5 of the embodiment described later for the right frame 2) extending in the longitudinal direction of the vehicle body. In the suspension mounting structure in which both end portions are joined to each other, a stiffening member 7 horizontally mounted on the upper surface of the floor 4 by mounting bolts 5 extending from the suspension cross member 3 to the upper surface of the floor 4 through the frame 1. Is configured to be fastened together with the suspension cross member 3. The present embodiment is an example applied to the rear suspension side in which the engine room is arranged at the front and the trunk room is arranged at the rear, but is applied to the front suspension in which the trunk room is arranged at the front in the rear engine. It is also possible.
[0008]
Referring to FIG. 2 and FIG. 3 which are enlarged views of part A in FIG. 1, in this embodiment, as shown in FIG. 3, the suspension cross member 3 is attached to both ends of the frame 1 as shown in FIG. Mounting cylinder portions 3D and 3D are formed so that there are two joint points in the longitudinal direction of the vehicle body. On the other hand, the stiffening member 7 horizontally mounted on the upper surface of the floor 4 of the trunk room is, for example, a straight horizontal bar 7 having a circular cross section and left and right bifurcated portions 7A and 7B formed by branching from the vicinity of both ends of the horizontal bar 7. At these end portions, mounting cylinder portions 7D and 7D are formed at positions corresponding to the mounting cylinder portions 3D and 3D at both ends of the suspension cross member 3. The front and rear mounting cylinder portions 7D and 7D are coupled to each other by the front and rear coupling portion 7C, and a plurality of joint points to the frames 1 and 2 of the suspension cross member 3 are coupled to ensure high rigidity. Preferably, the horizontal bar 7 is fixed to the floor 4 at least near the center of the vehicle body as shown in FIG. If necessary, parts other than the vicinity of the center may be fixed to the floor.
[0009]
The attachment of the suspension cross member 3 to the frames 1 and 2 (only the frame 1 side will be described) is relatively long inserted from below the pair of front and rear mounting cylinder portions 3D and 3D at both ends of the suspension cross member 3. Each mounting bolt 5 is screwed into a welding nut 19 fixed to the bottom of the recessed portion 1A of the frame 1, and the tip protruding from the upper surface of the floor 4 is attached to the horizontal bar 7 and the mounting cylinder portion at the fork. 7D and 7D are inserted and screwed and tightened with the nut 6. Thus, as shown in FIG. 1, lateral links 17 and 18 (see FIG. 4 to be described later) having fulcrums in the vicinity of both ends of the suspension cross member 3 joined to the vehicle body are supported so as to be swingable up and down. A wheel housing 20 fitted with a tire T is disposed at the free ends of the lateral links 17 and 18. A strut 8A that constitutes a damper is interposed between the wheel housing 20 and the vehicle body, and shocks from the road surface via the tire T are buffered.
[0010]
Since it is configured in this manner, a force such as a lateral impact as shown in FIG. 4 (B) applied to the suspension cross member 3 during traveling is applied to the bottom wells of the frames 1 and 2 as shown in FIG. Even if the bearing bolt 5 has a relatively long span H with the vicinity of the ding nut 19 as a fulcrum, the mounting bolt 5 can be handled with a high strength even with a small proof strength. In addition, since at least the left and right sides of the front end side of the mounting bolt 5 are firmly connected by the stiffening member 7 laid horizontally on the upper surface of the floor 4, the complicated front / rear / left / right and vertical impacts acting on the suspension cross member 3. This ensures high rigidity against the wheel and does not cause a change in wheel alignment. That is, as shown in FIG. 4A, even if the load acting on the suspension cross member 3 is displaced via the front and rear lateral links 17 and 18, the suspension cross member 3 is deformed by the backup of the stiffening member 7. And toe change is rarely caused on the wheels. Further, when the joint points to the frames 1 and 2 at both ends of the suspension cross member 3 are set at a plurality of positions in the longitudinal direction of the vehicle body, and the front and rear coupling portions 7C for connecting these joint points are formed, the suspension cross member is particularly preferable. 3 can effectively exhibit high rigidity even with respect to torsion acting on 3. Further, when the vicinity of the center of the vehicle body of the stiffening member 7 is fixed to the floor 4, the rigidity function as a reinforcing member of the stiffening member 7 is backed up by the floor 4 and further improved.
[0011]
5A and 5B show a second embodiment of the suspension mounting structure of the present invention. FIG. 5A is an overall rear view, and FIG. 5B is an enlarged cross-sectional view taken along line BB in FIG.
In the present embodiment, in the suspension mounting structure in which both ends of the suspension cross member 3 are joined to the lower surfaces of a pair of left and right frames 1 and 2 extending in the longitudinal direction of the vehicle body, the frame 1, Inclined bar 10 (11) having the other end fixed to the top of strut tower 9 (8) is fastened together with suspension cross member 3 by mounting bolts 5 and 5 extending through 2 to the upper surface of floor 4. It is structured. In the present embodiment, the inclined bars 10 and 11 are arranged in a cross shape, and various forces acting on the suspension cross member 3 are transferred to the tops of the strut towers 8 and 9 to ensure rigidity. In addition, similarly to the first embodiment, a stiffening member 7 laid horizontally on the upper surface of the floor 4 is also arranged, and the suspension cross member 3 and the inclined bars 10 and 11 are fastened together. It can also comprise so that higher rigidity may be ensured.
[0012]
By fixing each other at the cross coupling portion P of the left and right pair 10, 11 of the inclined bar, the load from the suspension cross member 3 acting individually via the cross coupling portion P is distributed and passed to both. The mutual rigidity of the pair of left and right inclined bars 10, 11 is complemented. In addition, the mounting portions of the inclined bars 10 and 11 to the mounting bolts 5 and 5 and the mounting portions of the strut towers 8 and 9 to the top of the strut towers 8 and 9 have a plurality of locations (two in the illustrated example) in the longitudinal direction of the vehicle body. Front and rear connecting portions 10C and 11C for connecting these joint points (see front and rear connecting portions 11C for connecting the mounting bolts 13 and 13 drawn above the strut tower 9 in FIG. 5A) are formed, and the suspension cross member is formed. 3 can be improved in rigidity against torsion. Further, as shown in FIG. 5 (B), the horizontal bar 7 which is a stiffening member laid across the upper surface of the floor 4 is fixed to the floor 4 at least near the center of the vehicle body via the angle member 15. . The fixing is performed by spot welding S together with the vehicle body side cross member 14 fixed to the lower surface of the floor 4. The tops of the left and right strut towers 8 and 9 are connected to each other by the top horizontal bar 12 to increase the rigidity between the strut towers 8 and 9, and the stiffening function by the strut towers 8 and 9 of the inclined bars 10 and 11 is enhanced. .
[0013]
With such a configuration, various loads acting on the suspension cross member 3 can be handled with high strength even with a small proof strength on the tip side of the mounting bolt 5 with a relatively long span H. Moreover, the front end side of the mounting bolt 5 is backed up by the inclined bars 10 and 11 that are firmly connected to the tops of the left and right strut towers 8 and 9 and intersect each other. In addition, high rigidity against impacts in the vertical direction is ensured, and the alignment change of the wheels is not caused. Further, by configuring the stiffening member 7 horizontally mounted on the upper surface of the floor 4 to be fastened together with the suspension cross member 3 and the inclined bars 10 and 11, higher rigidity can be secured. Further, when the crossing portion P is provided by fixing the crossing portions of the inclined bars 10 and 11, the mounting bolt 5 that receives the force from the suspension cross member 3 is a suspension cross that uses the vicinity of the welding nut 19 as a fulcrum. Even if it tries to move in the opposite direction to the member 3, it can be passed to the strut tower with its proof strength due to the protrusion of the intersecting inclined bar. This strength is doubled by the arrangement of the top horizontal bar 12 that connects the tops of the strut towers.
[0014]
As described above, the embodiment of the present invention has been described. However, within the scope of the present invention, the shape and type of the suspension cross member (which may be the type of the suspension subframe), the shape and type of the frame including the cross-sectional shape, Welding nut shape, arrangement, suspension cross member mounting location (applicable not only to the rear but also to the rear engine type front), mounting bolt shape, type, stiffening member side Bar, slant bar shape (number of joints with suspension cross member, pipe shape including front / rear connecting part formation and cross-joint fixing form, bar shape, plate shape, etc.), type, material (steel material, aluminum material) , Fiber reinforced resin, etc.) and its mounting form on the floor and strut tower, suspension of wheels on suspension cross members Formula can be appropriately selected for interposed forms and the like of the strut between the wheel and the vehicle body.
[0015]
【The invention's effect】
As described above in detail, according to the present invention, the distance between the floor of the vehicle and the lower surface of the pair of left and right frames provided on the lower surface of the floor that extends in the longitudinal direction of the vehicle body is approximately the height of the floor and the frame. In the suspension mounting structure in which both ends of the suspension cross member arranged with each other are joined, the suspension cross member is horizontally mounted on the floor upper surface by mounting bolts extending from the suspension cross member to the floor upper surface through the frame. The stiffening member connecting the pair of left and right frames is fastened together with the suspension cross member, and the stiffening member is configured to be fixed to the floor at least near the center of the vehicle body . By simply using long mounting bolts, it can be easily retrofitted to inconspicuous parts such as the trunk room. The lateral impact force applied to the suspension cross member during running is high strength even with a small strength on the tip side of the mounting bolt across a relatively long span with the frame bottom as a fulcrum. Can improve the rigidity around the suspension and does not cause a change in wheel alignment. In addition, the rigidity function of the stiffening member as a reinforcing member is backed up by the floor and further improved.
[0016]
Also, the vehicles floor, the pair of right and left frame lower surface extending in the longitudinal direction of the vehicle body provided in a floor bottom surface, both end portions of the suspension cross member which is arranged at a distance by the height of the floor substantially frame In the suspension mounting structure in which each is joined, an inclined bar having the other end fixed to the top of the strut tower is fastened together with the suspension cross member by mounting bolts extending from the suspension cross member through the frame to the upper surface of the floor. In addition, when the pair of left and right crossing portions of the inclined bar are fixed to each other , various loads acting on the suspension cross member are attached with a relatively long span through the inclined bar added later. It is possible to handle with high strength with small proof strength on the tip side of the bolt , Are borne securely on the opposite side of the strut tower top opposing, it is ensured a high rigidity never cause alignment change of the wheel. Strength Moreover, mounting bolt under the force of the sub scan pension cross member, the backward even try to move to, collision-clad inclined bar counterpart at the intersection of the suspension cross member for a fulcrum near welding nut It can be passed to the strut tower and high rigidity can be secured.
[0017]
Further, when the stiffening member laid horizontally on the floor upper surface is configured to be fastened together with the suspension cross member and the inclined bar, a higher stiffening ability is exhibited by the synergistic effect of the box shape and the bracing function. Is done.
Further, when the joint points to the frame at the both ends of the suspension cross member are a plurality of positions in the longitudinal direction of the vehicle body, and the front and rear coupling portions that connect these joint points are formed at both ends of the stiffening member and the inclined bar In particular, high rigidity is effectively exhibited against torsion acting on the suspension cross member.
As described above, according to the present invention, the rigidity of the mounting portion and the rigidity of the suspension cross member can be improved and the relative displacement between the mounting bolts can be prevented with only a few additional configurations without modifying the conventional structure. Thus, a suspension mounting structure that does not cause undesirable alignment changes is provided.
[Brief description of the drawings]
FIG. 1 shows a first embodiment of a suspension mounting structure according to the present invention and is a rear view of a main part.
FIG. 2 is an enlarged view of a portion A in FIG.
FIG. 3 is a perspective view of the suspension cross member and the stiffening member.
FIG. 4 is an explanatory diagram of a state of application of force to each part of the suspension.
5A and 5B show a second embodiment of the suspension mounting structure of the present invention, in which FIG. 5A is an overall rear view, and FIG. 5B is an enlarged cross-sectional view taken along the line BB of FIG.
FIG. 6 is a rear view showing a conventional suspension mounting structure and an enlarged view of a main part thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Left frame 1A Concave part 2 Right frame 3 Suspension cross member 3D Mounting cylinder part 4 Floor 5 Mounting bolt 6 Nut 7 Horizontal bar (stiffening member)
7A Left bifurcated portion 7B Right bifurcated portion 7C Front / rear coupling portion 7D Mounting cylinder portion 8 Left strut tower 8A Strut 9 Right strut tower 9A Strut 10 First inclined bar (stiffening member)
11 Second inclined bar (stiffening member)
11C Front / rear connecting part 12 Top side bar (stiffening member)
13 Mounting bolt 16 Trailing link 17 Lateral link 18 Lateral link 19 Welding nut 20 Wheel housing H Reinforcement span P Cross joint S Spot weld T Tire

Claims (4)

Both ends of a suspension cross member arranged at a distance of the height of the floor and the frame are joined to a vehicle floor and a pair of left and right frames provided on the floor lower surface extending in the longitudinal direction of the vehicle body. In the suspension mounting structure, a stiffening member that is horizontally mounted on the floor upper surface and connects the pair of left and right frames by a mounting bolt that extends from the suspension cross member to the floor upper surface through the frame is a suspension cross member. A suspension mounting structure characterized by being fastened together and configured so that the stiffening member is fixed to the floor at least near the center of a vehicle body . Both ends of a suspension cross member arranged at a distance of the height of the floor and the frame are joined to a vehicle floor and a pair of left and right frames provided on the floor lower surface extending in the longitudinal direction of the vehicle body. In the suspension mounting structure, the inclined bar having the other end fixed to the top of the strut tower is fastened together with the suspension cross member by a mounting bolt extending from the suspension cross member to the upper surface of the floor through the frame. suspension mounting structure according to claim 3, wherein the pair of left and right intersections of the inclined bar is configured so that are fixed to each other. The suspension mounting structure according to claim 2 , wherein the stiffening member horizontally mounted on the floor upper surface is configured to be fastened together with the suspension cross member and the inclined bar. A plurality of joint points to the frame at both ends of the suspension cross member are formed in the longitudinal direction of the vehicle body, and front and rear coupling portions that connect these joint points are formed at both ends of the stiffening member and the inclined bar. The suspension mounting structure according to any one of claims 1 to 3 .

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