JP2532778Y2 - Mounting structure of rear-wheel drive for automobile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION The present invention relates to a mounting structure for a rear wheel drive device of an automobile.

2. Description of the Related Art In a rear-wheel drive automobile, a front mount member for attaching a front end of a differential gear device (hereinafter, referred to as a rear differential) to a vehicle body is extended forward from a front end of the rear differential. The one in which the fuel tank is mounted between the rear differential and the body mounting portion in the direction in which the front mount member extends is conventionally developed and disclosed (for example, see Japanese Utility Model Application Laid-Open No. 62-52026).

After assembling the front end of the differential device to the differential support member, both ends of the differential support member are attached to a suspension member via a differential front mount, and the rear end of the differential device is attached to the suspension member via a differential rear mount. In a differential device in which the four corners of the suspension member are attached to a vehicle body via a body mount, the body mount is elastically displaceable mainly in the front-rear direction, and the differential front mount is elastically deformable mainly in the vertical direction. A device that can be displaced to reduce the transmission of vibration noise of a differential device to a vehicle body has been conventionally developed and disclosed (for example, see Japanese Utility Model Application Laid-Open No. 62-94924).

Problems to be Solved by the Invention In the case of the first prior art, since the fuel tank is disposed between the front and rear mount members, at the time of a front collision, the cross member to which the front mount member is attached retreats. The possibility of contact with the fuel tank remains, and it is not always safe.

Further, if the mounting position of the differential support member for supporting the front end of the differential device to the suspension member is offset in the longitudinal direction of the vehicle body from the mounting position of the suspension member to the vehicle body as in the second prior art. There is a problem in that the member is twisted, which is disadvantageous in terms of vibration noise.

The present invention seeks to address the conventional problems as described above.

Means for Solving the Problems The present invention attaches the left and right ends of a rear suspension subframe front and a rear suspension subframe rear to which a rear wheel suspension device is attached to left and right body side members via mounting members, respectively. A fuel tank is arranged in front of the frame front, and the left and right ends of the differential mount member front and the differential mount member rear that support the differential gear device are mounted to the rear suspension subframe front and the rear suspension subframe rear via a mounting member. Of the differential mount member front and the differential mount member rear that support the differential gear device in the front and rear directions, the distance between the left and right mounting portions between the rear suspension subframe front and the rear suspension subframe rear is larger. The rear suspension of the differential mount member A straight line connecting the mounting points to the body side members at the right and left ends of the rear suspension subframe front or the rear suspension subframe rear when the position of the mounting portion to the subframe front or the rear suspension subframe rear is viewed from above and below. It is characterized by being positioned above.

Action As described above, the differential mount displacement of the front and rear differential mount members is different from the combined force of the pitching torque reaction force and the rolling torque reaction force acting on the front and rear differential members supporting the differential gear device during sudden start. The differential mount member having a large distance between the left and right mounting portions with a large input load has the mounting portions on both side ends near the mounting points of the rear suspension subframe front or the rear suspension subframe rear to the left and right body side members. Since it is located on a straight line connecting the points, even if the above-described combined force is applied, the rear suspension subframe front or rear suspension subframe rear does not exert much force on the rear suspension subframe, which is advantageous in strength and rigidity. Installed on the attachment part of the frame front or rear suspension subframe rear to the body side member The mounting member is not kinked, and vibration and noise can be reduced.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 to 6, reference numerals 1 and 1 denote left and right body side members provided on the lower surface of a floor panel (not shown) and having a slightly smaller interval between them near the rear wheel. The rear suspension subframe front 2 is attached to the left and right body side members 1, 1 at positions near the front end of the rear wheel via left and right subframe mount fronts 2a, 2a made of an elastic material. Left and right brackets 2b, 2b extending in the front direction of the vehicle body are fixed to the rear suspension subframe front 2 near the left and right ends thereof, and the rear suspension subframe front 2 has a shape that gradually curves upward and rearward as it approaches the center line. The front ends of the left and right brackets 2b, 2b are located near the left and right subframe mount fronts 2a, 2a when viewed from above and below at the intersection with the straight line (XX) connecting the 2a, 2a. Welding nuts 2c and 2 for attaching the differential mount member front 3 described above
c is provided.

Reference numeral 3 denotes a differential mount member front having a closed cross section. Left and right differential mount fronts 3a, 3a made of an elastic material are fixed to left and right ends of the differential mount member front, and are inserted through the differential mount fronts 3a, 3a. The differential mount member front 3 is attached to the rear suspension sub-frame front 2 by bolts 3b, 3b screwed into welding nuts 2c, 2c at the ends of brackets 2b, 2b provided near the left and right ends of the rear suspension sub-frame front. Can be

Reference numeral 4 denotes a rear suspension sub-frame rear having a closed cross section. The left and right ends of the rear suspension sub-frame rear 4 are disposed at positions near the rear ends of the rear wheels of the left and right body side members 1, 1 and the right and left sub-frame mounting rear 4a. , 4a, and a differential mount member rear 5 is provided near the center of the rear suspension subframe rear 4 with left and right differential mount rears 5a, 5a.
The rear suspension sub-frame rear 4 and the rear suspension sub-frame front 2 are disposed in the front-rear direction of the vehicle at a left-right position substantially in the vicinity of the center line of the vehicle body and the left and right body side members 1, 1. It is rigidly connected by the left and right side brackets 6,6.

Reference numeral 7 denotes a differential gear, that is, a rear differential.
The front part of the sub frame mount front 2a, 2a
Are mounted and supported on the differential mount member front 3 having the above-mentioned closed cross section on a straight line XX connecting them, and the rear portion is fixedly supported by the differential mount member rear 5 mounted on the rear suspension subframe rear 4.

Reference numeral 8 denotes a propeller shaft, 9 denotes a body cross member having a closed cross section, and the left and right ends of the body cross member 9 are rigidly connected to the left and right body side members 1, 1 located below the front edge of the rear seat 10. In the vicinity of the vehicle center line, a recess is provided over the upper portion of the propeller shaft 8 as shown in FIG.

Reference numeral 11 denotes a fuel tank. The fuel tank 11 is disposed between the body cross member 9 and the rear suspension subframe front 2 which gradually curves rearward and upward as approaching the vehicle center line. In the vicinity of the center line, the propeller shaft 8
And a recess straddling the upper portion of the rear differential 7.

In FIG. 4, 1a is a bracket fixed to the lower surface of the side member 1, 1b is a welding nut fixed to the bracket 1a, and a bolt inserted into the sub-frame mount front 2a and screwed into the welding nut 1b. 2d by the sub frame mount front 2a
Is attached to the side member.

In FIGS. 3 and 5, reference numeral 12 denotes a rear floor panel.
Along the upper surface of the fuel tank 11, and then slightly upward along the upper surface of the fuel tank 11, on which the rear seat 10 is placed.

On the lower surfaces of the rear suspension subframe front 2 and the rear suspension subframe rear 4 rigidly connected by the left and right side brackets 6, 6, for example, rear wheel suspension devices (not shown) each comprising front and rear lateral links are attached. Can be

In the above description, since the differential mount member front 3 is located near the sub-frame mount fronts 2a, 2a and on a straight line XX connecting the differential mount member fronts 2a when viewed from above and below, the differential mount member front 3 is pitched. Even when an input load such as a torque reaction force (ie, axle shaft driving reaction force) or a rolling torque reaction force (ie, a propeller shaft driving reaction force) is applied, no torsional force acts on the rear suspension subframe front 2 and the frame strength, rigidity, etc. Not only is this advantageous, but also the sub-frame mount fronts 2a, 2a do not suffer from kinks, etc., thereby reducing vibration transmission and suppressing noise generation.

Further, since the mounting bolts for the rear differential 7 and the differential mount member front 3 are also on the straight line XX, no torsional force acts on the differential mount member front 3 itself, and the same effect as described above can be expected.

Furthermore, not only is the "mount member extending forward from the front end of the differential gear" of the first prior example unnecessary, but also the strength and rigidity of the rear suspension subframe front 2 and the differential mount member front 3 are advantageous. Therefore, there are advantages such as cost reduction and weight reduction.

In the illustrated embodiment, of the front and rear differential mount members, the differential mount member front 3 has a larger interval between the mounting portions at both ends, and in this case, the pitching torque reaction force and the rolling torque are different. When an input load from the operating gear device 7 such as a reaction force is applied, the differential mount member front 3 has a larger differential mount displacement and a larger input load than the differential mount member rear 5. The above-described configuration is such that the mounting portion to the sub-frame front 2 is located on a straight line XX connecting the mounting points near the mounting points to the body side members 1, 1 at both ends of the rear suspension sub-frame front 2. Although the desired operation and effect as described above can be achieved, the differential mount member If the distance between the mounting portions at both ends is larger, the mounting portions of the both ends of the differential mount member rear 5 to the rear suspension subframe rear 4 are located near the mounting points of the both ends of the rear suspension subframe rear 4 to the body side members 1, 1. Is located on a straight line connecting the attachment points. As a result, the same operation and effect as in the illustrated embodiment can be obtained.

Effect of the Invention As described above, the differential mount member of the front and rear differential mount members is capable of reducing the combined force of the pitching torque reaction force and the rolling torque reaction force acting on the differential mount members before and after supporting the differential gear device at the time of sudden start. The differential mount member having a large gap between the left and right mounting portions with large displacement and large input load has the mounting portions on both side ends near the mounting point of the rear suspension subframe front or the rear suspension subframe rear to the left and right body side members. Since it is located on the straight line connecting the attachment points, even if the above-described combined force is applied, the rear suspension subframe front or the rear suspension subframe rear does not exert much torsional force or the like, which is advantageous in strength and rigidity. The rear suspension subframe front or rear suspension subframe The mounting member to be mounted does not suffer from kinking, and vibration and noise can be reduced.

Further, even if the propeller shaft 8 and the rear differential 7 move rearward during a frontal collision, the differential mount member front 3 supporting the front portion of the rear differential 7 and the rear suspension subframe front 2 to which the differential mount member front 3 is attached are mounted. Since both are located behind the fuel tank 11, there is no collision with the fuel tank 11 so that not only the safety is improved but also the front end of the fuel tank 11 is not affected by a frontal collision. 9 and the rear end is along the rear suspension subframe front 2 which gradually curves rearward and upward as it approaches the vehicle body center line, so that the capacity of the other fuel tank 11 can be secured. The front end is located immediately behind the body cross member 9 to prevent damage to the fuel tank due to stone splash chipping or the like. The rear differential 7 is mounted on the rear suspension sub-frame front 2 via the differential mount fronts 3a, 3a, and the rear suspension sub-frame front 2 is a body side member 1, which is a vehicle body side member. 1 is mounted via the sub-frame mount fronts 2a, 2a, so that it has a double vibration-proof structure, reducing the differential gear noise and road noise built into the rear differential 7, and the muffled indoor noise when driving at medium to high speeds, etc. It can have a great effect.

[Brief description of the drawings]

1 is an explanatory plan view showing an embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, FIG. 3 is a sectional view taken along line BB of FIG.
FIG. 5 is a sectional view taken along line CC of FIG. 1, FIG. 5 is a sectional view taken along line DD of FIG. 1, and FIG. 1 ... body side member, 2 ... rear suspension subframe front, 2a ... subframe mount front, 3
… Differential mount member front, 3a… differential mount front, 4… rear suspension subframe rear, 4a… subframe mount rear, 5… differential mount member rear, 6… side bracket, 7… differential gear Equipment (rear differential), 8: Propeller shaft, 9: Body cross member, 10: Rear seat, 11: Fuel tank, 12:
... Rear floor panel.

Claims (2)

(57) [Scope of request for utility model registration] The right and left ends of a rear suspension subframe front and a rear suspension subframe rear to which a rear wheel suspension device is mounted are respectively attached to left and right body side members via mounting members, and a fuel is provided in front of the rear suspension subframe front. In a vehicle of a type in which a tank is arranged, and left and right ends of a differential mount member front and a differential mount member rear that support a differential gear device are mounted to the rear suspension subframe front and the rear suspension subframe rear via a mounting member, Of the differential mount member front and the differential mount member rear that support the differential gear device at the front and rear, the differential mount member having the larger left-right mounting portion interval between the rear suspension sub-frame front and the rear suspension sub-frame rear is described above. Rear suspension subframe front or The position of the attachment portion to the yasass subframe rear is located on a straight line connecting the attachment points near the attachment point to the body side member at the left or right end of the rear suspension subframe front or the rear suspension subframe rear when viewed from above and below. A mounting structure for a rear wheel drive device of an automobile, wherein 2. A utility model registration according to claim 1, wherein said rear suspension sub-frame front is formed in a shape that gradually curves rearward and upward as approaching the vehicle body center line. Mounting structure of the rear wheel drive unit of a car.