JPH0243833Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a rear suspension member mounting structure that is preferably applied to front-wheel drive vehicles.

[Conventional technology]

As shown in FIG. 3, a rear suspension member 10 of a front wheel drive vehicle is generally attached to a rear floor side member 12 by tightening bolts 14.

The rear floor side members 12 are set with consideration given primarily to body rigidity, cargo space capacity, etc., without considering the arrangement position of the rear suspension member 10.

Therefore, the pivot position A of the rear suspension arm 16 to the rear suspension member 10 is
Since the rear suspension member 10 is located at a relatively distant position from the rear floor 18, the rear suspension member 10 has to have a shape with a large vertical offset B.

Offset B of rear suspension member 10
If is large, the rigidity of this member will be relatively low, and there is a disadvantage that input from the tire 20 will be easily transmitted to the body side.

Therefore, it is conceivable to increase the rigidity of the rear suspension member 10 by increasing the plate thickness or making the cross section larger. Since the strength and other issues also become a problem, this results in a significant increase in weight and cost.

[Problem that the invention attempts to solve]

In consideration of the above facts, the present invention aims to provide a rear suspension member mounting structure that makes it difficult to transmit input from tires to the body without causing a significant increase in weight and cost.

[Means for Solving the Problems] In the rear suspension member mounting structure according to the present invention, the rear floor side member is fixed to the rear floor pan and forms a closed section extending substantially in the longitudinal direction of the vehicle, and the end portion in the vehicle width direction is fixed to the rear floor pan. a rear floor cross member which is fixed to the rear floor side member from below, and whose end portion in the vehicle width direction is bulged downward from other portions and projects downwardly from the closed cross section to serve as a protruding portion; and a rear suspension member whose end portion is attached to the protruding portion.

[Effect]

In the rear suspension member mounting structure configured as described above, at least the portion of the rear floor cross member to which the rear suspension member is attached protrudes downward from the rear floor side member, so that the rear suspension member is substantially straight in the horizontal direction. This makes it possible to reduce or eliminate the vertical offset of the rear suspension member.

As a result, the rigidity of the rear suspension member can be increased without increasing the plate thickness or increasing the cross section.

Further, since the body-side attachment portion of the rear suspension member becomes a rear floor cross member near the portion to which it is fixed to the rear floor side member, the rigidity of the attachment portion of the rear suspension member is also increased.

〔Example〕

1 and 2 show an embodiment of a rear suspension member mounting structure according to the present invention.

A rear floor side member 24 having a generally hat-shaped cross section and extending in the longitudinal direction of the vehicle body is fixed to the end portion of the rear floor 22 in the width direction of the vehicle body. Further, a rear floor cross member 26 having a substantially hat-shaped cross section is fixed to the rear floor 22 and extends linearly in the width direction of the vehicle body. A bulge 28 is formed at the end of the rear floor cross member 26. The bottom surface 30 of the bulging portion 28 is inclined so as to gradually protrude significantly downward in the vehicle body width direction as it goes outward in the vehicle width direction, but at the extreme end, it is parallel to the rear floor 22 and is used for mounting the rear suspension member. It is assumed to be surface 32.

Ends of the rear floor cross member 26 are fixed to the rear floor side members 24, linearly connecting the left and right rear floor side members 24. Since the end of the rear floor cross member 26 is formed into the bulge 28 as described above, the rear suspension member mounting surface 32 is located lower than the bottom surface 34 of the rear floor side member 24 in the vehicle body.

A wheel house inner panel 38 that forms a wheel house with an outer panel 36 is fixed to the end of the rear floor 22 in the vehicle body width direction. A lower end portion of a quarter panel 40 is fixed to an outer end portion of the outer panel 36 in the vehicle body width direction.

The wheel house gazette 42 includes an end face in the vehicle width direction of the rear floor cross member 26, that is, an end face in the same direction as the bulge portion 28, an outer side face in the vehicle width direction of the rear floor side member 24, a bottom surface of the rear floor 22, and a wheel house inner panel 38. are fixed to the inner side surfaces of the vehicle body in the width direction.

The rear suspension member 44 has a closed cross section with an upper panel 46 and a lower panel 48 fixed to each other. The upper panel 46 has a flat top surface, and the lower panel 48 has a bottom surface formed with an inclined surface 50 that slopes upward in the vehicle width direction between the center and end portions in the vehicle width direction. The rear suspension member 44 has a body mount (not shown) disposed at the end in the vehicle width direction, is attached to the rear floor cross member 26 via bolts (not shown), and is mounted directly below the rear floor cross member 26. It is located in

That is, this bolt was inserted into a through hole 52 formed in the rear suspension member mounting surface 32 of the bulging portion 28, and was fixed to the back surface of this mounting surface 32 so that the nut hole overlapped with the through hole 52. It is screwed and fastened to a weld nut 54.

A lower arm 56 of the rear suspension is swingably supported by the rear suspension member 44 via a bush (not shown), and supports a rear tire 58. Note that the lower arm 56 is able to swing relatively upwardly because the inclined surface 50 is formed on the rear suspension member 44.

In this embodiment configured as described above, the input from the rear tire 58 is transmitted to the rear floor 22 and rear floor side member 24 via the lower arm 56, rear suspension member 44, and rear floor cross member 26, and is further transmitted to the wheel house gage. It is also transmitted to the wheel house inner panel 38 via the port 42.

As described above, in this embodiment, the rear suspension member 44 is attached to the bulge 28 formed in the rear floor cross member 26. As a result, the mounting position of the rear suspension member 44 on the body side is lowered, and it is possible to arrange the rear suspension member 44 in a substantially straight line without offset. Therefore, the rigidity of the rear suspension member 44 is increased without increasing the thickness or the cross section.

Further, by simply forming the bulge 28 on the rear floor cross member 44, the rear suspension member 4
Rather than lowering the mounting position of 4, the bulge 28
At the same time, the wheel house gazette 42 connects the bulge 28 to the rear floor side member 24, the rear floor 22, and the wheel house inner panel 38, thereby increasing the rigidity of the rear suspension member attachment part. It is elevated.

For these reasons, input from the rear tire is transmitted to the rear suspension member with increased rigidity and the rear suspension mounting portion with increased rigidity, thereby reducing body vibration.

In addition, in this embodiment, the rear floor cross member 2
6 shows an example in which the bulging portion 28 is molded separately from the viewpoint of press moldability and material yield, but it may of course be molded integrally.

[Effect of idea]

As explained above, with the rear suspension member mounting structure according to the present invention, it is possible to reduce the offset or to dispose the rear suspension member that has been abolished, without causing a significant increase in weight and cost. This has the effect of making it difficult to transmit input from the tires to the body.

[Brief explanation of the drawing]

1 is a sectional view showing an embodiment of the rear suspension member mounting structure according to the present invention, which corresponds to the view taken along the - line in FIG. 2; FIG. 2 is a perspective view of the embodiment seen from below; FIG. 3 is a sectional view showing a conventional structure. 22... Rear floor, 24... Rear floor side member, 26... Rear floor cross member, 2
8...Bulge, 38...Wheel house inner panel, 42...Wheel house gazette, 44...Rear suspension member, 56...Lower arm,
58... Rear tire.

Claims (1)

[Claims for Utility Model Registration] (1) A rear floor side member that is fixed to the rear floor pan and constitutes a closed section extending substantially in the longitudinal direction of the vehicle; an end portion in the vehicle width direction is fixed to the rear floor side member from below; A rear floor cross member whose end in the vehicle width direction bulges downward from other parts and projects downward from the closed section to serve as a protrusion, and a rear suspension whose end in the vehicle width direction is attached to the protrusion. A rear suspension member mounting structure characterized by comprising a pension member. (2) The rear suspension member mounting structure according to claim 1, wherein the rear floor cross member is reinforced with a wheel house gusset that is connected to the inner wheel house at a portion where the rear floor cross member is fixed to the rear floor side member.