JP7409185B2 - 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 device 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 front end side of the differential device 13 is attached to the first cross member 5 via the attachment parts 13aL and 13aR, and the rear end side is attached to the second cross member 5 via the differential attachment bracket 25. It is attached to 7. According to Patent Document 1, by attaching the differential device 13 to the first cross member 5 and the second cross member 7 that are separated from each other in the longitudinal direction of the vehicle while realizing a lower floor of the vehicle, the differential device 13 is connected to the vehicle body. It is stated that it is possible to suppress vibration input.

Japanese Patent Application Publication No. 2009-279993

However, in the technique of Patent Document 1, the mounting portions 13aL, 13aR and the differential mounting bracket 25 are installed only on the lower surfaces of the first cross member 5 and the second cross member 7, respectively. Therefore, there is still room for improvement in terms of the installation rigidity of each attachment part.

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; A differential mounting structure for a vehicle includes a mounting part to which a differential is mounted, and the mounting part includes one or more mounting brackets provided on the lower surface of the cross member, and a mounting part on the floor, front side or rear side of the cross member. It is characterized by including a reinforcement joined across a wall surface and at least one of the one or more mounting brackets.

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 an enlarged view of the attachment part of FIG.1(b). FIG. 2(a) is a view of the mounting portion of FIG. 2(a) viewed from the front of the vehicle. FIG. 4 is a sectional view taken along line AA of the attachment portion in FIG. 3; It is a modification of the attachment part of FIG. 4.

A typical configuration of a vehicle differential mounting structure according to an embodiment of the present invention includes a cross member extending in the vehicle width direction under the floor at the rear of the vehicle, and a vehicle differential mounting structure provided on the cross member. In a vehicle differential mounting structure comprising a mounting part to which the device is mounted, the mounting part includes one or more mounting brackets provided on the lower surface of the cross member, a floor, a wall surface on the front or rear side of the cross member, and and a reinforcement joined across at least one of the one or more mount brackets.

According to the above configuration, the reinforcement connects the floor, the cross member, and the mount bracket, so that deformation of the mounting portion in the front, back, left, and right directions can be suppressed. Further, by joining the reinforcement to the front wall or rear wall of the cross member, vertical vibration of the mounting portion can be suppressed. This improves the mounting rigidity of the differential.

The one or more mount brackets described above may be provided as a pair at intervals in the vehicle width direction, and the reinforcement may be placed across the pair of mount brackets. With this configuration, the reinforcement can efficiently reinforce the pair of mount brackets, and the mounting rigidity of the differential device can be further improved.

The above-mentioned cross member has a hat-shaped cross-section, and the mounting portion further includes a partition member provided inside the cross member, and the partition member is joined to the reinforcement and at least one mounting bracket via the cross member. Good.

According to the above configuration, by providing the partition member within the cross member, it is possible to further improve the rigidity of the mounting portion as a whole.

Each of the above-mentioned pair of mounting brackets extends from the bottom surface of the cross member to either the front or rear of the vehicle where the reinforcement is located, and the reinforcement is connected to the floor joint where it is joined to the floor and the front wall of the cross member. Alternatively, it may include a cross member joint that is joined to the rear wall, a bracket joint that is joined to the upper side of the mount bracket, and legs that connect the floor joint, the cross member joint, and the bracket joint.

According to the above configuration, the leg portions of the reinforcement can suitably prevent deformation and vibration of the mount bracket.

The above-mentioned leg portion may be provided in a range between a pair of mount brackets when viewed from the front-rear direction of the vehicle. With this configuration as well, it is possible to efficiently reinforce the mount bracket, and the mounting rigidity of the differential device is further improved.

The front and rear walls of the cross member mentioned above are inclined so as to approach each other as they go downward, and the partition member is located inside the front or rear wall of the cross member to which the cross member joint of the reinforcement is joined. It is good if it is connected to the

According to the above configuration, the reinforcement efficiently supports the mount bracket by also utilizing the rigidity of the partition wall member, and the mounting rigidity of the differential device is further improved.

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 part 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. , and to suppress deformation of each member. In particular, the mounting structure 100 of this embodiment focuses on improving the rigidity of the mounting portion 106 that supports the front side of the vehicle of the differential gear 102.

FIG. 1(b) is a diagram with the differential device 102 of FIG. 1(a) removed. The cross member 108 is a member serving as a frame of the vehicle body, and extends in the vehicle width direction below the floor 104 at the rear of the vehicle. The attachment portion 106 is provided on the front cross member 108 at the rear of the vehicle, and the front end side of the differential gear 102 is attached thereto. Note that the rear end side of the differential gear 102 is attached to a plurality of brackets 112 provided on the rear cross member 110.

FIG. 2 is an enlarged view of the attachment portion 106 in FIG. 1(b). FIG. 2(a) is an enlarged view of the mounting portion 106 in FIG. 1(b). The mounting portion 106 includes a pair of mount brackets 114a, 114b, a reinforcement 116, and a pair of partition members 118a, 118b (see FIG. 2(b)).

The mount brackets 114a and 114b are arranged on the lower surface 108a of the cross member 108 at intervals in the vehicle width direction. Connection holes 120a and 120b are provided in the mount brackets 114a and 114b, respectively, and circular connection areas 126a and 126b are formed around the connection holes 120a and 120b as areas to which the differential gear 102 is connected. There is. The differential gear 102 is connected between the connection areas 126a and 126b of the mount brackets 114a and 114b via a cushioning material or the like. Although the mount brackets 114a and 114b are integrated with each other at the rear side of the vehicle by a connecting portion 122 (see FIG. 3(b)), they may be configured to be independent from each other.

The reinforcement 116 is a member that reinforces the mount brackets 114a, 114b, and is joined across the floor 104, the front wall 108b of the cross member 108, and the mount brackets 114a, 114b. The reinforcement 116 connects each member and increases the rigidity, so that the mounting portion 106 as a whole can suppress deformation and vibration in the front, back, left, right, and up and down directions. The mounting portion 106 can efficiently transmit the load input from the differential gear 102 to the cross member 108, and the mounting structure 100 also uses the cross member 108 to prevent vibrations originating from the differential gear 102. becomes possible.

FIG. 2(b) is a diagram illustrating the reinforcement 116 and cross member 108 in FIG. 2(a) as seen through. The cross member 108 has a hat-shaped cross section (see FIG. 4), and forms a closed cross section with the floor 104. A pair of partition members 118a and 118b are provided inside this cross member 108. The partition members 118a and 118b have a shape that follows the inside of the cross member 108, and are joined to the reinforcement 116 and the mount brackets 114a and 114b, respectively, via the cross member 108. By providing the partition members 118a and 118b within the cross member 108, the rigidity of the mounting portion 106 as a whole is further improved.

FIG. 3 is a diagram of the mounting portion 106 of FIG. 2(a) viewed from the front of the vehicle. FIG. 3(a) is a view of the mounting portion 106 of FIG. 2(a) as viewed from the front of the vehicle. The reinforcement 116 is placed across the pair of mount brackets 114a and 114b in the vehicle width direction. In particular, the reinforcement 116 has a shape wider in the vehicle width direction than the mount brackets 114a, 114b, and is joined to the front wall 108b of the cross member 108 across the mount brackets 114a, 114b. With this configuration, the mount brackets 114a, 114b can be efficiently reinforced, and deformation and vibration of the mount brackets 114a, 114b in the vehicle width direction can be suppressed.

Referring again to FIG. 2(a). The reinforcement 116 is formed with two legs 124a and 124b. The legs 124a and 124b are columnar parts that protrude toward the front of the vehicle, and are formed to extend in the vertical direction. Providing the legs 124a and 124b increases the moment of inertia of the reinforcement 116, increasing the rigidity of the reinforcement 116 and making it difficult to bend.

FIG. 3(b) is a diagram showing the reinforcement 116 and cross member 108 in FIG. 3(a). Above the mount brackets 114a, 114b, partition members 118a, 118b are provided. The partition wall members 118a, 118b are slightly wider in the vehicle width direction than the mount brackets 114a, 114b. The load applied to the mount brackets 114a, 114b is also distributed to the partition members 118a, 118b.

The legs 124a and 124b of the reinforcement 116 are provided in a range between the mount brackets 114a and 114b when viewed from the front of the vehicle. Connection areas 126a, 126b of mount brackets 114a, 114b bulge in a direction toward each other. The legs 124a, 124b of the reinforcement 116 are provided so that the outer sides in the vehicle width direction are adjacent to the connection areas 126a , 126b of the mount brackets 114a, 114b, respectively. According to this configuration, the reinforcement 116 utilizes the legs 124a, 124b in the range between the mount brackets 114a, 114b to efficiently receive the load, and preferably prevents vibration and deformation of the mount brackets 114a, 114b. be able to.

FIG. 4 is a sectional view taken along the line AA of the mounting portion 106 in FIG. The configuration of the mount bracket 114a and the partition wall member 118a will be described below with reference to FIG. 4, but the mount bracket 114b (see FIG. 3(b)) and the partition wall member 118b also have a similar structure.

As described above, the cross member 108 has a hat-shaped cross section and forms a closed cross section with the floor 104. A portion of the mount bracket 114a including the connection region 126a (see FIG. 2(a)) extends further forward of the vehicle than the lower surface 108a of the cross member 108 where the reinforcement 116 is located.

Each part of the reinforcement 116 will be explained in detail. The floor joint portion 128 is a portion joined to the floor 104, and is joined to the floor 104 and the front flange of the cross member 108. The cross member joint 130 is joined to the front wall 108b of the cross member 108. The bracket joint portion 132 is joined to the upper side of a portion of the mount bracket 114a extending toward the front of the vehicle and downward from the lower surface 108a of the cross member 108.

Note that, in the mounting portion 106, the cross member 108 is joined to the floor 104 after the mount bracket 114a, the reinforcement 116, and the partition wall member 118b are joined to the cross member 108. For example, at the floor joint 128 of the reinforcement 116 in FIG. 4, a maximum of four members, including the floor 104, overlap. However, if the reinforcement 116, the mount bracket 114a, and the partition wall member 118b are first joined to the cross member 108, only three members overlap at most. When joining parts together using spot welding, the fewer parts are overlapped, the more complete the joint will be. Therefore, as described above, each member is first joined to the cross member 108. Note that when joining the cross member 108 to the floor 104, it is preferable to perform spot welding at locations where the reinforcements 116 do not overlap.

The legs 124a and 124b of the reinforcement 116 in FIG. 2(a) extend linearly to connect the floor joint 128, the cross member joint 130, and the bracket joint 132. This configuration allows the reinforcement 116 to efficiently reinforce the mount brackets 114a and 114b. In particular, the reinforcement 116 can efficiently support the connection areas 126a, 126b of the mount brackets 114a, 114b using the legs 124a, 124b, so deformation and vibration can be effectively suppressed.

Referring again to FIG. The cross member 108 has a hat-shaped cross section, and is inclined so that the front wall 108b and the rear wall 108c approach each other downwardly. The partition member 118a is joined to the inner side of the front wall 108b of the cross member 108, to which the cross member joint portion 130 of the reinforcement 116 is joined. With this configuration, the partition member 118a supports both the reinforcement 116 and the mount bracket 114a from above. Particularly, the partition wall member 118a is larger in size than the mount bracket 114a in both the vehicle longitudinal direction and the vehicle width direction, and the mount bracket 114a is installed so as to fit within the range of the partition wall member 118a in the vertical direction. With these configurations, the reinforcement 116 can efficiently support the mount bracket 114a by also utilizing the rigidity of the partition wall member 118a.

(Modified example)
FIG. 5 shows a modification (attachment section 200) of the attachment section 106 in FIG. 4. In the following, the same components as those already described are given the same reference numerals, and therefore, the explanation of the components that have already been described will be omitted. Furthermore, in the following description, components with the same names as those already described have the same functions, even if they are given different numerals, unless otherwise specified.

In the attachment portion 200, the mount bracket 202 protrudes toward the rear of the vehicle with respect to the lower surface 108a of the cross member 108. The reinforcement 204 is joined to the rear wall 108c of the cross member, and is configured to support the mount bracket 202 from above at the rear of the vehicle. In this configuration as well, similarly to the mounting portion 106 shown in FIG. 4, the load related to the mount bracket 202 can be efficiently received using the reinforcement 204, and vibration and deformation of the mount bracket 202 can be suitably prevented. .

In addition to the above embodiments, it is also possible to use two reinforcements at the same time. For example, it is also possible to have two mounting brackets on the lower surface 108a of the cross member 108, and to provide reinforcements on the vehicle front side and the vehicle rear side, respectively. Further, each reinforcement does not necessarily need to be installed across two mount brackets, and it is also possible to have a configuration in which one reinforcement is joined to one mount bracket. Moreover, it is also possible to install a plurality of reinforcements side by side in the vehicle width direction. In addition to the configuration in which the mount brackets are arranged in the vehicle width direction, the mount brackets can also be arranged in pairs in the vehicle longitudinal direction, or in pairs in the vertical direction. In any of the configurations of the mount bracket, the rigidity can be improved by connecting the mount bracket to the front wall or rear wall of the cross member using reinforcement. Further, there is no restriction on the cross member to which these mount brackets and reinforcements are installed, and they can be installed, for example, on the cross member 110 (see FIG. 1(b)) on the rear side of the vehicle.

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... Mounting part, 108... Cross member, 108a... Lower surface of cross member, 108b... Front wall of cross member, 108c... Rear wall of cross member, 110... Cross member, 114a, 114b... Mount bracket, 116... Reinforcement, 118a, 118b... Partition member, 120a, 120b... Connection hole, 122... Connection portion, 124a, 124b... Leg portion, 126a, 126b... Connection area, 128... Floor joint part, 130...Cross member joint part, 132...Bracket joint part, 200...Mounting part of modification, 202...Mount bracket of modification example, 204...Reinforcement of modification example

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 mounting part is
one or more mount brackets provided on the lower surface of the cross member;
A vehicle differential mounting structure comprising: a reinforcement joined across the floor, a front or rear wall surface of the cross member, and at least one of the one or more mount brackets. The one or more mount brackets are provided as a pair at intervals in the vehicle width direction,
2. The vehicle differential mounting structure according to claim 1, wherein the reinforcement is placed across the pair of mount brackets. 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 reinforcement and the mount bracket via the cross member. Each of the pair of mount brackets extends beyond the lower surface of the cross member toward either the front or rear of the vehicle where the reinforcement is located,
The reinforcement is
a floor joint joined to the floor;
a cross member joint portion joined to the front wall or rear wall of the cross member;
a bracket joint part joined to the upper side of the mount bracket;
4. The vehicle differential mounting structure according to claim 3, further comprising a leg portion connecting the floor joint, the cross member joint, and the bracket joint. 5. The vehicle differential mounting structure according to claim 4, wherein the leg portion is provided in a range between the pair of mount brackets when viewed from the vehicle front-rear direction. The front wall and the rear wall of the cross member are inclined so as to approach each other downwardly,
The vehicle differential according to claim 4 or 5, wherein the partition wall member is joined to the inside of the front wall or rear wall of the cross member to which the cross member joint portion of the reinforcement is joined. dynamic device mounting structure.

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