JP7409181B2 - Vehicle differential installation structure - Google Patents

Description

The present invention relates to a mounting structure for a vehicle differential.

Generally, a differential device (also called a differential gear) is provided below the rear of a vehicle to absorb the difference in rotation between left and right wheels when the vehicle turns a curve. A differential gear is a relatively large device and is required to have high mounting rigidity to the vehicle body because it receives a load while the vehicle is running.

For example, in the technique disclosed in Patent Document 1, the rear differential case 1 is supported by a front cross member 4A and a rear cross member 4B, and a pair of center members 2A and 2B are spanned between these cross members. According to Patent Document 1, it is stated that it is possible to improve the rigidity of each cross member and to improve the noise and vibration performance of the vehicle.

Japanese Patent Application Publication No. 9-76934

However, in the rear cross member 4B, the differential mount 5 is provided on the lower surface of the cross member 4B. Furthermore, there is no structure that can further absorb the load received by the cross member 4B. Therefore, it cannot be said that the rigidity of the cross member 4B has been improved, and there is still room for improvement in terms of efficiently suppressing vibration and deformation of the vehicle body.

SUMMARY OF THE INVENTION In view of these problems, an object of the present invention is to provide a vehicle differential mounting structure that can improve the mounting rigidity of a differential.

In order to solve the above problems, a typical configuration of the vehicle differential mounting structure according to the present invention includes a cross member extending in the vehicle width direction under the floor at the rear of the vehicle; The vehicle differential mounting structure further includes a front member extending from the cross member to the front of the vehicle, and a front member extending from the cross member to the rear of the vehicle. A front bracket is provided along the front wall of the cross member between the front wall and the rear end of the front member and protrudes below the cross member, and the mounting portion is attached to the rear wall of the cross member. The cross member is characterized by including a rear bracket provided between the rear wall and the front end of the rear member along the cross member and protruding below the cross member.

According to the present invention, it is possible to provide a vehicle differential device mounting structure that can improve the mounting rigidity of the differential device.

1 is a diagram schematically showing a mounting structure for a vehicle differential device according to an embodiment of the present invention. It is the figure which looked at the said attachment structure of FIG.1(b) from below. FIG. 3 is a diagram showing the front bracket and rear bracket of FIG. 2, respectively. FIG. 2 is a perspective view of the mounting structure of FIG. 1(b) viewed from the rear upper left of the vehicle. 3 is a sectional view taken along line AA of the mounting structure shown in FIG. 2. FIG. 6 is a sectional view taken along line BB of the mounting structure shown in FIG. 5. FIG.

A vehicle differential mounting structure according to an embodiment of the present invention includes a cross member extending in the vehicle width direction under a floor at the rear of the vehicle, and a mounting structure provided on the cross member to which a vehicle differential is attached. The vehicle differential mounting structure further includes a front member extending from the cross member toward the front of the vehicle, and a rear member extending from the cross member toward the rear of the vehicle, and the mounting portion includes a , a front bracket provided along the front wall of the cross member between the front wall and the rear end of the front member and protruding below the cross member, and a front bracket along the rear wall of the cross member between the rear wall and the front end of the rear member. and a rear bracket that is provided between the rear bracket and the rear bracket and projects further downward than the cross member.

According to the above configuration, the front bracket and the rear bracket can be firmly installed, the mounting rigidity of the differential device can be increased, and vibration and deformation of the vehicle body can be suppressed.

The above-mentioned front bracket and rear bracket may be provided so as to overlap each other when viewed from the front-rear direction of the vehicle. Since the front bracket and the rear bracket overlap in the longitudinal direction of the vehicle with the cross member in between, it is possible to further increase the mounting rigidity of the differential.

The cross member described above has a hat-shaped cross section, and the mounting portion further includes a partition member provided inside the cross member, and the partition member may be joined to the front bracket and the rear bracket via the cross member.

The above-mentioned partition wall member also makes it possible to further increase the mounting rigidity of the differential and suppress vibration and deformation of the vehicle body.

The dimension of the front bracket in the vehicle width direction may be larger than the rear end of the front member, and the dimension of the rear bracket in the vehicle width direction may be larger than the front end of the rear member. According to this configuration, the front bracket and the rear bracket are joined to the ends of each member and the cross member over a wide area, so that the mounting rigidity of the differential device is improved.

The above-mentioned front bracket and rear bracket each have a tapered shape that protrudes downward from the cross member when viewed from the front and rear direction of the vehicle, and the edge of the front bracket has a flange shape that is bent toward the front of the vehicle. The edge of the rear bracket is a flange shape bent toward the rear of the vehicle, and the tapered oblique sides of the front bracket and rear bracket are curved inward when viewed from the front and rear direction of the vehicle. A connection hole to which a differential device is connected may be formed below the cross member.

According to the above configuration, since the edges of the front bracket and the rear bracket are flange-shaped, the front bracket and the rear bracket can maintain high rigidity even if they have a tapered shape. In particular, in the above configuration, the torsional rigidity against loads in the front and rear direction is increased by curving the oblique side inward instead of simply forming a tapered shape. Therefore, it is possible to efficiently improve the mounting rigidity of the differential gear.

The above-mentioned vertical dimension of the front member increases downward as it approaches the rear end of the front member, and the vertical dimension of the rear member increases downward as it approaches the front end of the rear member. The rear end of the rear member may be joined to the front bracket in a state where it protrudes below the cross member, and the front end of the rear member may be joined to the rear bracket in a state where it projects below the cross member.

With the above configuration, since the front member and the rear member are widely joined to the front bracket and the rear member, respectively, it is possible to further improve the installation rigidity of the front bracket and the rear bracket.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in these examples are merely illustrative to facilitate understanding of the invention, and do not limit the invention unless otherwise specified. In this specification and the drawings, elements having substantially the same functions and configurations are designated by the same reference numerals to omit redundant explanation, and elements not directly related to the present invention are omitted from illustration. do.

FIG. 1 is a diagram schematically showing a mounting structure for a vehicle differential device (hereinafter referred to as mounting structure 100) according to an embodiment of the present invention. Hereinafter, in Figure 1 and all other drawings of this application, arrows F (Forward) and B (Backward) indicate the longitudinal direction of the vehicle, arrows L (Leftward) and R (Rightward) respectively indicate the left and right directions of the vehicle width, and arrows L (Leftward) and R (Rightward) indicate the vehicle vertical direction. are illustrated by arrows U (upward) and D (downward), respectively.

FIG. 1(a) is a diagram showing the lower side of the rear of a vehicle in which the mounting structure 100 is implemented. The mounting structure 100 is a group of members for attaching the differential gear 102 to the lower side of the floor 104 of the vehicle, and by improving the mounting rigidity of the differential gear 102, it reduces vibrations of the floor while driving. , attempts are made to suppress deformation of each member. In particular, the mounting structure 100 focuses on improving the rigidity of the mounting portions 112 and 144 that support the vehicle rear side of the differential gear 102.

FIG. 1(b) is a diagram with the differential device 102 of FIG. 1(a) removed. The cross members 108 and 110 are members that form the framework of the vehicle body, and extend in the vehicle width direction below the floor 104 at the rear of the vehicle. The attachment parts 112 and 114 are provided on the rear cross member 110 at the rear of the vehicle, and are attached to the rear end side of the differential gear 102. Note that the front end side of the differential device 102 is attached to a bracket 106 provided on a front cross member 108.

The mounting portion 112 and the mounting portion 114 are provided on the left and right sides of the cross member in the vehicle width direction, respectively, and support the rear end side of the differential gear. These attachment parts 112 and 114 have the same left-right symmetrical configuration. In the following description, the mounting part 112 on the left side in the vehicle width direction will be exemplified as a representative of the mounting parts 112 and 114.

The mounting structure 100 also includes a front member 116 and a rear member 118 as members involved in mounting the differential gear 102. The front member 116 and the rear member 118, like the cross members 108 and 110, are members provided below the floor 104. Front member 116 extends from cross member 110 toward cross member 108 at the front of the vehicle. The rear member 118 extends from the cross member 110 toward a back panel 120 at the rear of the vehicle.

The mounting portion 112 includes a front bracket 122 and a rear bracket 124. The front bracket 122 is provided along the front wall 110b of the cross member 110, and is sandwiched between the front wall 110b and the rear end 116a of the front member 116. The rear bracket 124 is provided along the rear wall 110c of the cross member 110, and is sandwiched between the rear wall 110c and the front end 118a of the rear member 118. Both the front bracket 122 and the rear bracket 124 have their lower ends protruding below the cross member 110, and the differential gear 102 is connected to these lower ends via a buffer member or the like.

FIG. 2 is a view of the mounting structure 100 of FIG. 1(b) viewed from below. The main purpose of the mounting structure 100 of this embodiment is to improve the mounting rigidity of the differential gear 102. First, the front bracket 122 and the rear bracket 124 are provided so as to overlap each other when viewed from the longitudinal direction of the vehicle, and the differential device 102 (see FIG. 1(a)) is connected between them. Since the front bracket 122 and the rear bracket 124 overlap in the longitudinal direction of the vehicle with the cross member 110 in between and face each other, the mounting rigidity of the differential gear 102 can be further increased.

FIG. 3 is a diagram showing the front bracket 122 and rear bracket 124 of FIG. 2, respectively. FIG. 3(a) is a diagram of the front bracket 122 viewed from the front of the vehicle. In FIG. 3A, the rear end 116a side of the front member 116 is partially omitted.

The dimension of the front bracket 122 in the vehicle width direction is set to be larger than the rear end 116a of the front member 116. In particular, the dimensions of the front bracket 122 are set to a size that allows the flange 116b of the rear end 116a of the front member 116 to fit therein. The front bracket 122 having this configuration is connected to the rear end 116a of the front member 116 and the front wall 110b of the cross member 110 (see FIG. 1(a)) over a wide area, so It becomes possible to exhibit high mounting rigidity.

FIG. 3(b) is a diagram of the rear bracket 124 viewed from the rear of the vehicle. In FIG. 3(b), the front end 118a side of the rear member 118 is partially omitted. The dimension of the rear bracket 124 in the vehicle width direction is set to be larger than the front end 118a of the rear member 118. The dimensions of the rear bracket 124 are also set to such a degree that the flange 118b of the front end 118a of the rear member 118 is accommodated therein. Since the rear bracket 124 having this configuration is joined to the front end 118a of the rear member 118 and the rear wall 110c of the cross member 110 over a wide area, it is possible to exhibit high mounting rigidity for the differential gear 102. Become.

Referring again to FIG. 1(b). The front bracket 122 has a flange shape with an edge 126 bent toward the front of the vehicle from the lower end to the vehicle width direction side. Similarly, the rear bracket 124 also has a flange-like edge 128 bent toward the rear of the vehicle from the lower end to the vehicle width direction side.

As shown in FIG. 3(a), the front bracket 122 has a tapered shape in which the lower end 130 side protrudes below the cross member 110 when viewed from the front of the vehicle. At this time, the left oblique side (edge 126a) and the right oblique side (edge 126b) in the vehicle width direction with the lower end 130 as the boundary are diagonal virtual straight lines connecting the left and right corners 132, 134 and the lower end 130, respectively. It has a shape that is curved inward with respect to L1 and L2. Furthermore, in the front bracket 122, a connection hole 136 to which the differential gear 102 is connected is formed below the cross member 110.

Further, as shown in FIG. 3(b), the rear bracket 124 has a tapered shape in which a lower end 138 side protrudes below the cross member 110 when viewed from the rear of the vehicle. At this time, the right oblique side (edge 128a) and the left oblique side (edge 128b) in the vehicle width direction with the lower end 138 as the boundary are diagonal virtual straight lines connecting the left and right corners 140, 142 and the lower end 138, respectively. It has a shape that is curved inward with respect to L3 and L4. Also in the rear bracket 124, a connection hole 144 to which the differential gear 102 is connected is formed below the cross member 110.

With the above configuration, the flange-like edges 126a, 126b on the lower end 130 side of the front bracket 122 and the flange-like edges 128a, 128b on the lower end 138 side of the rear bracket 124 function as braces, and This makes it difficult to bend, making it possible to efficiently improve rigidity even with a tapered shape. In particular, simply tapering the shape tends to cause torsional deformation when subjected to a load in the front-rear direction. Therefore, in this embodiment, the oblique sides of the front bracket 122 and the rear bracket 124 are curved inward to improve torsional rigidity. and solve the problem. Note that the front bracket 122 and the rear bracket 124 have their lower ends tapered, and the connection holes 136 and 144 are provided as close to the lower surface 110a of the cross member 110 as possible. Prevents deformation when subjected to load.

FIG. 4 is a perspective view of the mounting structure 100 of FIG. 1(b) viewed from the rear upper left of the vehicle. The cross member 110 has a hat-shaped cross section and forms a closed cross section with the floor 104 (see FIG. 1(b)). The attachment portion 112 further includes a partition member 146 provided inside the cross member 110. The partition member 146 is a member that further forms a closed cross section inside the cross member 110, and is also joined to the front bracket 122 and the rear bracket 124 via the cross member 110.

The partition wall member 146 also increases the mounting rigidity of the differential gear 102 and makes it possible to suppress vibration and deformation of the vehicle body. Particularly, the partition wall member 146 is provided inside the cross member 110 so as to bridge the front member 116 and the rear member 118 in a straight line in the longitudinal direction of the vehicle. By providing the partition member 146, the rigidity of the cross member 110 is further improved. Furthermore, the front bracket 122 and the rear bracket 124 are connected by the partition member 146, making it possible to further suppress vibrations and deformation originating from the differential gear 102.

FIG. 5 is a cross-sectional view taken along line AA of the mounting structure 100 shown in FIG. As described above, the cross member 110 has a hat-shaped cross section. Here, the partition member 146 in FIG. 4 has a lower wall 148 and a side wall 150, and forms a closed cross section in a part of the inside of the cross member 110 extending in the vehicle width direction.

In FIG. 5, a lower wall 148 of the partition wall member 146 appears. The lower wall 148 of the partition member 146 broadly contacts the floor 104, and its longitudinal ends are joined to the lower sides of the front and rear flanges 110d and 110e of the cross member 110. The lower wall 148 of the partition wall member 146 has a shape as flat as possible so that there is no step in the front-rear direction.

The vertical dimension of the front member 116 gradually increases downward as it approaches the rear end 116a, and the front member 116 is joined to the front bracket 122 with the rear end 116a protruding downward more than the cross member 110. . Further, the vertical dimension of the rear member 118 gradually increases downward as it approaches the front end 118a, and the rear member 118 is joined to the rear bracket 124 with the front end 118a protruding below than the cross member 110.

With the above configuration, the front member 116 and the rear member 118 are widely joined to the front bracket 122 and the rear bracket 124, respectively. Therefore, it is possible to further improve the installation rigidity of the front bracket 122 and the rear bracket 124. Further, the front bracket 122 and the rear bracket 124 are reinforced by the front member 116 and the rear member 118 up to the vicinity of the connection holes 136 and 144 on the lower ends 130 and 138 side. Therefore, it is possible to efficiently transmit the load input through the connection holes 136 and 144 to the front member 116 and the rear member 118, thereby suppressing deformation and vibration.

In addition, in the mounting structure 100, the front bracket 122 and the front member 116 are joined to the cross member 110 by spot welding or the like, and the cross member 110 and the partition wall member 146 are joined at a location different from the welding point at this time. are joined together. That is, welding is avoided at a position where four members overlap, and welding is performed at a position where a maximum of three members overlap. This is because when joining members by spot welding, the smaller the number of overlapping parts, the more complete the joining can be.

FIG. 6 is a BB sectional view of the mounting structure 100 of FIG. The partition member 146 has flanges 150a, 150b and flanges 152a, 152b at the front and rear of side walls 150, 152, respectively, and is joined to the front bracket 122 and rear bracket 124 via the cross member 110. As a result, a closed cross section is formed that extends from the front member 116 to the partition wall member 146 inside the cross member 110 and then to the rear member 118 in the longitudinal direction of the vehicle. With this configuration, vibrations from the differential gear 102 transmitted to the front bracket 122 and the rear bracket 124 can be transmitted to each member, and vibrations of the floor 104 can be prevented.

As described above, according to this embodiment, the front bracket 122 and the rear bracket 124 can be firmly installed, increasing the mounting rigidity of the differential gear 102, and suppressing vibration and deformation of the vehicle body. . In particular, according to this embodiment, it is possible to suitably suppress vibrations of the floor 104 originating from the differential gear 102.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is clear that those skilled in the art can come up with various changes and modifications within the scope of the claims, and these naturally fall within the technical scope of the present invention. Understood.

INDUSTRIAL APPLICATION This invention can be utilized for the differential installation structure for vehicles.

DESCRIPTION OF SYMBOLS 100... Mounting structure, 102... Differential device, 104... Floor, 106... Bracket, 108... Cross member, 110... Cross member, 110a... Bottom surface, 110b... Front wall, 110c... Rear wall, 110d, 110e... Flange, 112 , 114... Mounting part, 116... Front member, 116a... Rear end, 116b... Flange, 118... Rear member, 118a... Front end, 118b... Flange, 120... Back panel, 122... Front bracket, 124... Rear bracket, 126... Edge , 126a, 126b... Edge of hypotenuse, 128... Edge, 128a, 128b... Edge of hypotenuse, 130... Lower end, 132, 134... Corner, 136... Connection hole, 138... Lower end, 140, 142... Corner, 144... Connection hole, 146...Partition member, 148...Bottom wall, 150, 152...Side wall, 150a, 150b...Flange, 152a, 152b...Flange, L1 to L4...Virtual straight line

Claims (6)

A cross member extending in the vehicle width direction under the floor at the rear of the vehicle;
A vehicle differential mounting structure comprising: a mounting portion provided on the cross member to which a vehicle differential is mounted;
The vehicle differential mounting structure further includes:
a front member extending toward the front of the vehicle from the cross member;
and a rear member extending toward the rear of the vehicle from the cross member,
The mounting part is
a front bracket provided along the front wall of the cross member between the front wall and the rear end of the front member and protruding below the cross member;
A vehicle differential mounting structure comprising: a rear bracket provided along the rear wall of the cross member between the rear wall and the front end of the rear member and protruding below the cross member. . 2. The vehicle differential mounting structure according to claim 1, wherein the front bracket and the rear bracket are provided so as to overlap each other when viewed from the longitudinal direction of the vehicle. The cross member has a hat shape in cross section,
The attachment part further includes a partition member provided inside the cross member,
3. The vehicle differential mounting structure according to claim 2, wherein the partition wall member is joined to the front bracket and the rear bracket via the cross member. The dimension of the front bracket in the vehicle width direction is larger than the rear end of the front member,
4. The vehicle differential mounting structure according to claim 1, wherein a dimension of the rear bracket in the vehicle width direction is larger than a front end of the rear member. The front bracket and the rear bracket each have a tapered shape that protrudes below the cross member when viewed from the front-rear direction of the vehicle,
The edge of the front bracket has a flange shape bent toward the front of the vehicle,
The edge of the rear bracket has a flange shape bent toward the rear of the vehicle,
The oblique sides of the tapered shapes of the front bracket and the rear bracket are curved inward when viewed from the longitudinal direction of the vehicle,
According to any one of claims 1 to 4, each of the front bracket and the rear bracket has a connection hole formed below the cross member to which the differential gear is connected. The vehicle differential mounting structure described. The vertical dimension of the front member increases downwardly as it approaches the rear end of the front member,
The vertical dimension of the rear member increases downwardly as it approaches the front end of the rear member,
A rear end of the front member is joined to the front bracket in a state that protrudes below the cross member,
The vehicle differential mounting structure according to any one of claims 1 to 5, wherein a front end of the rear member is joined to the rear bracket in a state of protruding downward from the cross member. .

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