JPH0241062Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of a suspension device for a vehicle.

[Conventional technology]

FIG. 3 shows an example of a double wishbone suspension device. In the figure, the suspension device has a pair of side members 1a and 1b disposed along both side edges of a body (not shown), and the side members 1a and 1b cross each other at their intermediate and rear ends, respectively. They are connected by members 2a and 2b. Body mounting seats 11 and 12 are formed at the front and rear ends of the side members 1a and 1b, thereby supporting the body.

The base ends of left and right V-shaped upper control arms 3a, 3b are pivotally connected to the side members 1a, 1b, and one ends of radius slots 4a, 4b extending rearward are pivotally connected to the front ends. . The cross member 2a has its center curved upward, and the front part of the differential case 4 passes through the lower part of the curved part 21 in the front-rear direction. One ends of left and right lower control arms 5a and 5b are pivotally attached to both sides of the curved portion 21, respectively. The illustrated suspension device further includes a pair of lower control arms 5c and 5d,
One end of these is pivotally connected to the tip of a sub-member 6 (only one of which is shown) that projects downward from the rear end portions of the side members 1a, 1b.

Incidentally, a differential case 4 is fixed to the curved portion 21 of the cross member 2a, passing through it. Conventionally, the upper surface of the case 4 is fixed to the lower surface of the curved portion 21 as shown in FIG. There is.

[Problem that the invention attempts to solve]

In this structure, an upward vibration force F1 acts on the differential case 4 as shown by the arrow in the figure during wind-up vibration. In addition, an axial vibration force F2 (arrow shown) acts on each of the lower control arms 5a, 5b from the unillustrated wheel side to which the other ends of these arms are connected toward the pivot point 51 in the figure. Both of these vibration forces F1 and F2 act as bending forces that further curve the curved portion 21. Conventionally, countermeasures such as increasing the wall thickness of the curved portion 21 have been taken in order to provide sufficient rigidity against such vibration forces F1 and F2. This resulted in an increase in weight.

[Means for solving problems]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a suspension device for a vehicle in which a cross member for fixing a differential case has sufficient rigidity and is lightweight.

FIG. 1 shows the configuration of the suspension device of the present invention.

In the figure, protrusions 41a and 41b are formed in the left-right direction on both side walls of a portion of the differential case 4 that passes through the curved portion 21 of the cross member 2a, and both protrusions 41a and 41b are formed on the side walls of the portion that passes through the curved portion 21 of the cross member 2a. The lower surface 22a of the cross member 2a on both sides of the
It is fixed at 22b.

〔Example〕

The following will mainly explain the differences from the conventional structure.

FIG. 1 shows the main parts of the suspension device of the present invention, and is a view corresponding to the view of arrow A in FIG. 3. In the figure, the cross member 2a is curved upward at the center, and a differential case 4 is disposed below a curved portion 21 forming a rectangular concave space so as to pass through the curved portion 21 in the front-rear direction. The case 4 has projecting portions 4 on both sides of the penetrating portion in the left-right direction.
1a, 41b are formed, and the protrusions 41a, 41b are formed.
41b are lower surfaces 22a, 22 extending horizontally from symmetrical positions on the left and right and forming horizontal surfaces on both sides of the curved portion 21;
It is fixed at b.

Horizontal portions 22 bordering on both sides from the curved portion 21
A bracket portion 221 is formed protrudingly on the lower surface, and each lower control arm 5 is attached to the bracket portion 221.
One ends of a and 5b are pivotally connected. In this state, the two pivot points 51a, 51b and the fixed portions of the protrusions 41a, 41b of the differential case 4 are located substantially on a straight line.

In this structure, the vibration force F1 acting on the differential case 4 due to wind-up vibration is received by the horizontal portion 22 of the cross member 2a, and
The vibration force F2 acting on a and 5b is received by the case 4 and does not act as a bending force on the curved portion 21.

[Effect of idea]

As described above, the vehicle suspension device of the present invention forms protrusions from both side walls of the differential case that pass through the curved portion of the cross member, and extends the protrusions from both sides of the curved portion, respectively. By having a structure fixed to the lower surface of the cross member, the vibration force input from the differential case and lower control arm is prevented from acting as a bending force on the curved section, and as a result, the curved section is It can be made thin and lightweight.

As in the embodiment described above, by locating the fixed portion of the differential case and the pivot point of the lower control arm substantially in a straight line, the bending force acting on the curved portion can be made extremely small.

[Brief explanation of drawings]

Fig. 1 is a front view of the cross member showing the main parts of the present invention, and corresponds to the view A in Fig. 3. Fig. 2 is a front view of the cross member showing the conventional example, and Fig. 3 is the suspension. FIG. 1 is an overall perspective view of the device. 1a, 1b...Side member, 2a...Cross member, 21...Curved portion, 22a, 22b...Bottom surface of cross member, 3a, 3b...Atsupa control arm, 4...Differential case,
41a, 41b... protrusion, 5a, 5b... lower control arm.

Claims (1)

[Scope of utility model registration request] A pair of side members that support the vehicle body and have one end of the left and right upper control arms pivotally connected to each other, and a pair of side members that connect both side members and form an upwardly curved portion in the center thereof, and a curved portion that extends downwardly from the curved portion. In the suspension device, the suspension device includes a cross member which fixes a differential case passing through the front and back in the front-rear direction and has one end of the left and right lower control arms pivotally connected to each other, the differential case has the curved portion. A suspension device for a vehicle, characterized in that projecting portions are formed in the left-right direction on both side walls of a portion passing through the curved portion, and both projecting portions are respectively fixed to the lower surface of a cross member on both sides of the curved portion.