JPH0732226Y2 - Vehicle center bearing support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a support structure for a center bearing for pivotally supporting a propeller shaft in a vehicle, and more particularly to a floor tunnel for disposing the propeller shaft. The present invention relates to a support structure for a center bearing applied to a vehicle having a flat floor panel that is not formed.

(Prior Art) A structure in which a propeller shaft in an automobile is divided into a front shaft and a rear shaft and a connecting portion between these shafts is pivotally supported by a center bearing is described in, for example, Japanese Utility Model Publication No. 62-4429. There is a fixed center bearing mounting structure. The structure is such that the floor is bent so that it is convex on the upper surface side, a floor tunnel is formed on the lower surface side, appropriate reinforcement is applied, and the propeller shaft is stored and supported in the floor tunnel via a support member. I am trying to let you. The support member is formed of, for example, an arcuate bracket composed of an upper half part and a lower half part that are joined and fixed by bolt fastening, and via a reinforcing plate provided so as to form a closed cross section in the floor tunnel. The upper half of it is firmly joined and fixed to the floor side. With such a mounting structure, it is possible to improve the support rigidity of the propeller shaft, which tends to be a source of vibration and noise.

(Problems to be solved by the invention) By the way, when the floor top surface is flattened from the viewpoint of improving habitability, the floor tunnel is not formed, and thus the conventional center bearing mounting structure as described above is applied as it is. You cannot do it.

When the floor panel is flattened in this manner, the rigidity of the floor panel is reduced because the floor tunnel is not formed. Therefore, when supporting the center bearing on the lower surface side of the floor panel, Not only is it necessary to ensure support rigidity, but it is also necessary to improve the rigidity of the floor panel itself.

The present invention has been made in consideration of such circumstances, and its purpose is to increase the support rigidity of the center bearing in supporting the center bearing at the position on the lower surface side of the flat floor panel. It is intended to improve the rigidity of the floor panel itself while ensuring it.

(Means for Solving the Problems) In order to achieve the above object, the present invention is directed to a pair of side frames extending in the front-rear direction which are fixedly joined to both side edges of a flat floor panel in the vehicle width direction. The both side ends of the front and rear two rows of cross members joined to the lower surface of the floor panel and extending in the vehicle width direction are joined and fixed. Further, a pair of mount members joined to the lower surface of the floor panel and extending in the front-rear direction at substantially center positions in the vehicle width direction and having front and rear end portions joined and fixed to the two cross members are provided. Then, the propeller shaft is arranged at a lower position of the floor panel so as to extend in the front-rear direction between the pair of mount members, and a center bearing for pivotally supporting the propeller shaft is mounted on the pair of mount members via a bracket. Support. In addition, the pair of mount members on one end side from the support position of the center bearing are curved so as to open to both sides in the vehicle width direction.

(Operation) With the above configuration, in the present invention, the center bearing is supported by the pair of mount members on both sides in the vehicle width direction,
The pair of mount members are supported by the front and rear two cross members, and the two cross members are supported by the pair of side frames on both sides of the vehicle width. Therefore, the center bearing is finally supported by the highly rigid side frame. And high support rigidity is secured. In addition, the lower surface of the floor panel has a pair of cross members extending in the vehicle width direction at both front and rear positions between the pair of side frames, and a propeller shaft sandwiching a substantially central position between the cross members in the vehicle width direction. The floor panel is reinforced in a frame shape because it is joined to four members, each of which is a pair of mount members extending in the front-rear direction, and rigidity against bending and torsional strength is improved. In addition, since one end side of the pair of mount members is curved so as to open to both sides in the vehicle width direction and joined to the lower surface of the floor panel in the vehicle width direction from the center position in the vehicle width direction, the floor panel is formed. Are reinforced more evenly in the vehicle width direction, the rigidity of the floor panel is further improved, and the support rigidity of the center bearing is also improved.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to the drawings.

The embodiment relating to the vehicle center bearing support structure shown in FIGS. 1 and 2 is applied to a vehicle having a flat floor surface in which no floor tunnel is formed, and is configured as follows.

FIG. 1 is a view of the center bearing support structure as viewed from below. The schematic structure is such that a pair of side frames 8 and 9 extending in the front-rear direction (vertical direction in FIG. 1) respectively extends in the vehicle width direction (see FIG. The two front and rear rows of cross members 1 and 2 extending in the left-right direction are joined to the flat floor panel 3, and the two cross members 1 and 2 are mounted on the left and right mount members 4,5.
The center bearing 7 is supported by the support members 6 at substantially central positions of the mount members 4 and 5 in the front-rear direction. Reference numeral 17 in the drawing denotes a propeller shaft arranged so as to extend in the front-rear direction at the center position in the vehicle width direction, and the propeller shaft 17 is pivotally supported by the center bearing 7.

The pair of side frames 8 and 9 extend in the front-rear direction at both positions in the vehicle width direction, and have a flange portion formed in the hat cross section.
8a and 9a are joined and fixed to both side edges of the floor panel 3.

The cross members 1 and 2 have flange portions 1a,
It has a so-called hat cross-sectional shape of a concave groove having 1b, 2a, 2b, and its flange portion 1a, 1b, 2a, 2b is joined and fixed to the lower surface 3a of the floor panel 3 by spot welding, and between it and the floor panel 3. It forms a closed cross section that extends in the vehicle width direction.
And the left and right ends are the both side frames 8 and 9 above.
It is joined and fixed to the flange portions 8a and 9a.

The mount members 4 and 5 have flange portions 4a on both side edges,
The front portion having 4b, 5a, 5b has a slightly curved hat cross-section and has a slightly curved shape, and extends in the front-rear direction on both left and right sides with the propeller shaft 17 interposed therebetween, and the front and rear end portions thereof have the cross member 1, It is joined and fixed to the two flange portions 1b and 2a. Also, the flanges 4a, 4b, 5a, 5b of the mount members 4, 5 are spot welded to the floor panel 3
It is joined and fixed to the lower surface 3a and forms a closed cross section extending in the front-rear direction with the floor panel 3. At this time, the front end portions 4c, 5c of the mount members 4, 5 on the front side of the support position of the support member 6 are curved so as to open toward both sides in the vehicle width direction from the support position to the front side. Thus, the joint positions of the front end portions 4d, 5d to the cross member 1 come to be evenly arranged in the vehicle width direction between the sand frames 8, 9. Furthermore, the front ends 4d, 5 above
The outer flange portions 4a ', 5b' of d are made wider than others,
The mount members 4 and 5 are prevented from collapsing and the rigidity for supporting the floor panel 3 is enhanced.

As shown in FIG. 2, the supporting member 6 is composed of arcuate brackets 10 and 11 having an upper half portion and a lower half portion. The brackets 10 and 11 sandwich the center bearing 7 from above and below. It has become. And each bracket 10,1
The flange portions 10a, 10b, 11a, 11b of 1 are inserted into the bolts 12, 13 fixed to the mount members 4, 5, and are clamped by the interposing member 14 made of a rubber body to fasten the nuts 15, 16 It is supported with a moderate elasticity. The interposing member 14 interposed between the supporting member 6 and the mount members 4 and 5 effectively reduces vibration and noise from the propeller shaft 17 and reinforces the high-rigidity floor panel 3 described later.
Is further suppressed and the comfort is improved.

In the vehicle center bearing support structure thus configured, the center bearing 7 is supported by the pair of mount members 4 and 5 on both sides in the vehicle width direction, and the pair of mount members 4 and 5 includes the front and rear cross members 1, 2. Supported by 2,
Since the two cross members 1 and 2 are supported by the pair of side frames 8 and 9 on both sides of the vehicle width, the center bearing 7 finally has high rigidity side frames 8 and 9.
It is supported by 9 and high support rigidity is secured.

In addition, in the floor panel 3 between the pair of side frames 8 and 9 on both sides in the vehicle width direction, the two cross members 1 and 2 and the two mount members 4 and 5 are joined to the lower surface 3a of the floor panel 3, respectively. Since two closed frame-shaped cross sections are formed in the vehicle width direction and two in the front-rear direction between them to reinforce the floor panel 3, even if the floor panel 3 is flat, the bending and twisting The strength and rigidity are significantly improved. Besides, the above-mentioned pair of mount members 4,5
Since the front end portions 4c, 5c of the are curved so as to open to both sides in the vehicle width direction, the floor panel 3 is reinforced more evenly in the vehicle width direction, and the rigidity of the floor panel 3 is further improved. At the same time, the support rigidity of the center bearing 7 is improved.

Therefore, in supporting the center bearing 7 at the flat lower surface side position of the floor panel 3, it is possible to improve the rigidity of the floor panel 3 itself while ensuring high support rigidity of the center bearing 7.

(Effects of the Invention) As described above, according to the vehicle center bearing support structure described in the utility model registration claim, even if the floor panel is flat, the center bearing is highly supported at the lower surface side of the floor panel. In addition to being supported by rigidity, the rigidity of the floor panel itself can be improved.

[Brief description of drawings]

1 is a bottom view of the vehicle center bearing support structure of the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. 1,2 …… Cross member, 3 …… Floor panel, 3a ……
Underside of floor panel, 4, 5 ... Mount members, 4c, 5c
...... One end of mount member, 7 …… Center bearing, 8,9 …… Side frame, 10,11 …… Bracket,
17 …… Propeller shaft.

Claims (1)

[Scope of utility model registration request] 1. A flat floor panel, a pair of side frames which are fixedly joined to both side edges of the floor panel in the vehicle width direction and extend in the front-rear direction, and a pair of side frames which are joined to a lower surface of the floor panel and extend in the vehicle width direction. The front and rear two rows of cross members each end of which is joined and fixed to the pair of side frames are joined to the lower surface of the floor panel and extend in the front-rear direction at substantially the center position in the vehicle width direction. The propeller shaft comprises a pair of mount members joined and fixed to two cross members, and the propeller shaft is arranged at a lower position of the floor panel so as to extend in the front-rear direction between the pair of mount members. A center bearing that supports the shaft is supported by the pair of mount members via a bracket. Center bearing support structure for a vehicle, characterized in that the pair of mounting members of the one side end portion side from the support position of the grayed is bent to open to each other in the vehicle width direction both sides.