JPH048016Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rear support structure for an automobile power unit.

The rear part of the power unit, which includes the engine, clutch, transmission, etc., is located within the floor tunnel section and is mounted and supported via an elastic material such as rubber on a cross member provided so as to straddle the floor tunnel section.

The cross member that mounts and supports the rear part of the power unit as described above is usually attached at both ends to the flat part of the floor on both sides of the floor tunnel section via an elastic material such as rubber, and this elastic material directs the power unit vibration to the floor panel side. It is generally designed to absorb and reduce the transmission of
(Refer to Publication No. 86823, Publication of Utility Model Application Publication No. 56-63622, etc.).

However, the floor tunnel portion has low rigidity against loads in the vehicle width direction and low mechanical impedance. Therefore, increasing the rigidity of the floor tunnel to make it difficult for the floor tunnel itself to vibrate is effective as a measure to reduce vehicle interior noise. However, when trying to improve the rigidity of the floor tunnel, It is necessary to harden the elastic material interposed in the mounting part to the panel to create a connection that is almost rigid, but in this way it is not possible to absorb and reduce the transmission of power unit vibration to the floor panel. In addition, in order to sufficiently absorb the transmission of power unit vibrations to the floor panel, the elastic material inserted at the joints to the floor panel at both ends of the cross member should be as soft as possible, and the cross member should be in a floating state relative to the floor panel. If this is done, a problem arises in that the cross member hardly contributes to increasing the rigidity of the floor tunnel section.

The main purpose of the present invention is to solve the above-mentioned conventional problems, and will be described below with reference to embodiments shown in the accompanying drawings.

In the figure, 1 is a floor panel, 2 is a floor tunnel portion formed in the front-rear direction at approximately the center of the vehicle body width direction of the floor panel 1, and the rear end of the power unit 3, that is, the rear end of the transmission It is located inside the tunnel section 2.

4 is a first cross member, 5 is a second cross member, and the second cross member 5 has mounting parts 51, 51 at the left and right ends and a platform-shaped cushion mounting part 52 protruding upward in the center; The second cross member 5 is entirely composed of a hat-shaped cross-sectional member.

The first cross member 4 is the second cross member 5
It is composed of a hat-shaped cross-sectional member similar to the above, and has attachment parts 41 at both ends, and the second part in the center.
It has a structure having a through hole 42 into which the cushion attachment portion 52 of the cross member 5 fits with a predetermined margin.

Both end mounting portions 51 of the second cross member 5,
With the upper and lower surfaces of 51 sandwiched between elastic members 6, 6' such as rubber, the first cross member 4 is placed on top of the first cross member 4, and the sleeve 7 is fitted into the center hole of the elastic members 6, 6'. death,
A bracket 9 is fixed to both sides of the floor tunnel section 2 by inserting a bolt 8 therein, and tightening both end attachment sections 41 and 51 of the first and second cross members 4 and 5 together with the bolt 8. Tighten and install.

Then, both end portions of the first cross member 4 are rigidly coupled to both side portions of the floor tunnel portion 2, which significantly improves the rigidity of the floor tunnel portion 2 and increases its mechanical impedance.
Both end portions of the cross member 5 are floatingly supported by elastic members 6, 6 on both end attachment portions 41 of the first cross member 4, and the upper surface of the central cushion attachment portion 52 of the second cross member 5 is supported by elastic members 6, 6. 1 facing upward from the through hole 41 of the cross member 4,
A cushion 10 is mounted on the upper surface of the cushion mounting portion 52.
By mounting and supporting the rear part of the power unit 3 through the cushion 10 and the elastic members 6, 6', the vibrations of the power unit 3 are accurately absorbed by the cushion 10 and the elastic members 6, 6', and the transmission of the vibrations to the floor panel 1 side is greatly reduced. In combination with the increased rigidity of the floor tunnel portion 2 by the first cross member 4, it is possible to significantly reduce vehicle interior noise.

The cushion 10 is a stopper made of an elastic material that connects a mounting member 101 to the cross member 5 and a mounting member 102 to the power unit 3 with an elastic material 103 such as rubber, and restricts excessive displacement of both the mounting members 101 and 102. 104 and 105, etc., however, the cushion 10 may be of any conventionally known structure other than the one shown.

As described above, the present invention satisfies the two needs of improving the rigidity of the floor panel, increasing the mechanical impedance of the floor panel, and reducing the absorption of vibrations transmitted from the power unit to the floor panel. The structure is simple, lightweight, and compact because the first and second cross members are stacked and combined in two stages, one above the other. Not only does it not take up much space and is inexpensive, it also allows both cross members to be attached together with bolts, making assembly and removal extremely easy. , which can have many excellent practical effects.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention, showing the main parts in cross section. FIG. 2 is a plan view of the cross member portion of FIG. 1. DESCRIPTION OF SYMBOLS 1... Floor panel, 2... Floor tunnel part, 3... Power unit, 4... First cross member, 42... Through hole, 5... Second cross member,
52...Cushion attachment part, 6,6'...Elastic material,
10...Cushion.

Claims (1)

[Scope of utility model registration request] a second cross member having mounting portions at both ends and a cushion mounting portion protruding upward in the center; and a cushion mounting portion of the second cross member having mounting portions at both ends and the center portion. The first cross member has a through hole into which the second cross member fits with a margin, and the upper and lower surfaces of both side end attachment portions of the second cross member are sandwiched between elastic materials. Combine the members so that they are on the bottom side,
The upper surfaces of both side attachment parts of the first cross member are directly joined to the lower surfaces of the floor tunnel part formed in the center of the floor panel, and the both side attachment parts of both cross members are attached to both sides of the floor tunnel part with bolts through the cylinders. By fastening the two cross members together, the first cross member is rigidly connected to both side parts of the floor tunnel part, and the second cross member is connected to both side parts of the floor tunnel part in a floating state through the elastic material, and the second cross member is connected to the center of the floor tunnel part. A rear support structure for a power unit for an automobile, characterized in that the rear part of the power unit is connected to the upper surface of a cushion mounting part of the power unit via a cushion.