JP7035825B2 - Subframe structure - Google Patents

Description

The present invention includes a main body member that supports the suspension link and the power train, and a frame member that extends forward from the front portion of the main body member and absorbs a collision load from the front of the vehicle, and also includes a frame member in the front portion of the vehicle body in the front-rear direction of the vehicle. The present invention relates to a subframe structure composed of a subframe attached downward with respect to a vehicle body side frame extending to.

Generally, as a vehicle body front structure, a pair of left and right front side frames extending in the front-rear direction of the vehicle to support the vehicle body front are provided, and a subframe for supporting a suspension link for the front wheels is provided below the front side frame. Is known to be arranged.

The vehicle body front structure disclosed in Patent Document 1 has left and right side portions arranged below the front side frame, and front side portions connecting the front ends of the left and right side portions in the vehicle width direction, and has a plan view. It is equipped with a subframe consisting of a main body that opens rearward and is formed in a U shape, and a tower member that rises from the left and right side sides and is connected to the lower surface of the front side frame. It employs a subframe structure that extends forward from an intermediate position in the vertical direction of the tower member and has a pair of extension members that are deformed in cooperation with the front side frame to absorb the impact when the vehicle hits the front.

The subframe of Patent Document 1 includes a mount support member that supports the power train and is fastened and fixed to its side side portion, and also has a support portion (bracket) that supports the lower arm and the upper arm as suspension links.

Further, the tower member provided in the subframe divides the load input from the front of the vehicle from the front of the vehicle via the extension member into the main body portion below the extension member and the front side frame above the extension member, respectively. It is configured to transmit. That is, the tower member has a function of surely receiving the input load at the time of a front collision to prevent the power train from retreating and to promote impact absorption by the extension frame.

As described above, the subframe structure of Patent Document 1 aims to achieve both a suspension link support function, a power train mount support function, and a shock absorbing function at the time of a front collision of a vehicle by the above-described configuration.

However, since the subframe of Patent Document 1 includes, for example, a robust tower member extending in the vertical direction from the main body of the subframe to the front side frame, there is room for improvement in terms of reducing the vehicle weight and the number of parts. ..

On the other hand, for example, when the subframe of Patent Document 1 is simply configured without a tower member, for example, the input load input via the extension member is transferred to the front side frame on the vehicle body side. No branching load path is formed.

Then, for the above input load input from the front to the subframe at the time of front collision, the function to promote shock absorption by the extension frame while preventing the power train from retreating (that is, the shock absorption function at the time of front collision and the PT mount). It will be necessary for the main body of the subframe to independently carry the support function) without using the tower member.

Furthermore, if the tower member that had the suspension link support function up to that point is omitted, it is also necessary to independently support the suspension link by the main body of the subframe, which is a burden on the subframe. There is concern about an increase.

Specifically, depending on the front-rear force applied to the front wheels while the vehicle is running, a load inside the vehicle width direction (so-called lateral force) may be applied from the suspension link to the main body of the subframe via the support portion.

Therefore, as described above, when the suspension link is independently supported by the main body of the subframe via the support portion, the suspension link support rigidity is higher than that of the subframe (that is, the subframe itself). High rigidity) will be required.

On the other hand, if the vehicle body mounting part that attaches the subframe to the vehicle body side is provided as much as possible on the front side of the power train in the subframe, the power train will be suppressed from retreating when the vehicle hits the front. Since the subframe can absorb the impact as much as possible in front of the power train, it is considered to be preferable from the viewpoint of the impact absorption function of the subframe at the time of a vehicle front collision.

However, when the vehicle body mounting portion in the subframe, particularly near the suspension link support portion, is eliminated, the rigidity of the subframe in the vicinity of the support portion (for example, the support rigidity of the suspension link by the subframe) decreases accordingly. There is a risk of

As described above, there is concern about adverse effects due to an increase in the load on the subframe as the suspension link is independently supported by the main body of the subframe.

JP-A-2015-58856

The present invention has been made in view of such problems, and while reducing the weight of the vehicle and the number of parts, the shock absorbing function in front of the subframe at the time of a front collision of the vehicle is enhanced, and the suspension link is used while the vehicle is running. It is an object of the present invention to provide a subframe structure capable of suppressing deformation of the main body member of the subframe with respect to a load applied to the main body member of the subframe via a support portion in the vehicle width direction.

The present invention includes a main body member that supports the suspension link and the power train, and a frame member that extends forward from the front portion of the main body member and absorbs a collision load from the front of the vehicle, and also includes a frame member that absorbs a collision load from the front of the vehicle in the front-rear direction of the vehicle body. It is a subframe structure composed of a subframe attached downward to the vehicle body side frame extending to the above , and the main body member is provided with a support portion for supporting the inner end of the suspension link in the vehicle width direction. The support portion includes a front support portion and a rear support portion that support the inner end of the suspension link in the vehicle width direction on each of the front and rear sides, and a first front cross member extending in the vehicle width direction is provided in front of the main body member. In addition, a second front cross member extending in the vehicle width direction is provided between the first front cross member and the front support portion of the main body member, and is provided in front of the support portion of the main body member and described above. Behind the second front cross member, a displacement suppressing means for suppressing the relative displacement of the second front cross member with respect to the main body member is provided , and the subframe is mounted on the vehicle body to attach the subframe to the vehicle body side frame. The vehicle body mounting portion is provided behind the front support portion, and is characterized in that it is not located between the second front cross member and the front support portion in the vehicle front-rear direction .

According to the above configuration, the impact can be positively absorbed by the frame member provided in front of the subframe (in front of the support portion of the suspension link in the main body member) at the time of the front collision of the vehicle. In addition, the rigidity of the main body member behind the subframe is reduced (that is, in the vehicle width direction input from the suspension link with respect to the main body member), which occurs when the vehicle body mounting portion is removed near the suspension link support portion in order to enhance its action. Deformation of the subframe due to a load (lateral force) inward) can be suppressed by the displacement suppressing means.

As an aspect of the present invention, the displacement suppressing means has a range from the connection portion of the second front cross member to the front of the support portion in the vehicle front-rear direction of the main body member, and the vehicle width is wider than the other ranges. It is formed by an overhanging portion that overhangs inward in the direction, and the overhanging portion is formed by overhanging in the vehicle width direction including the connecting portion of the second front cross member.

According to the above configuration, the connection between the main body member of the subframe and the second front cross member is strengthened, and it is possible to prevent the main body member from being deformed by the input load from the suspension link to the main body member when the vehicle is running.

As an aspect of the present invention, the suspension link extends in the vehicle width direction so as not to protrude forward from the front support portion, and the overhanging portion extends to the front of the rear support portion. It was formed.

According to the above configuration, the impact absorption by the frame member in front of the subframe is not hindered by the suspension link at the time of front collision, and the impact can be reliably absorbed by the frame member.

Further, even if a load in the vehicle width direction (a moment acting on the rear support portion centering on the front support portion) is input from the suspension link to the main body member via the rear support portion during traveling, the main body member Can be reinforced by the overhanging part so that it does not deform.

Here, for the suspension link, for example, an L-shaped, an A-shaped or a triangular shape can be applied in a plan view, but the suspension link is in the vehicle width direction so as not to protrude forward from the front support portion. There is no particular limitation as long as the inner end in the vehicle width direction is supported by the front and rear sides of the main body member via the support portion.

As an aspect of the present invention, the overhanging portion is formed with ribs extending in the vehicle width direction along the second front cross member.

According to the above configuration, by reinforcing the overhanging portion with ribs, it is possible to further suppress the deformation of the main body member of the subframe with respect to the load (lateral force) input from the suspension link to the inside in the vehicle width direction.

As an aspect of the present invention, the rib is formed as a rear guide rib that extends in the vehicle width direction adjacent to the second front cross member from the rear side and guides the second front cross member from the rear side. It is a thing.

According to the above configuration, by guiding the second front cross member from the rear side by the rear guide rib, the main body member is loaded on the inside in the vehicle width direction input from the suspension link via the rear support portion during traveling. It is possible to effectively prevent the second front cross member from bending so that the center in the vehicle width direction protrudes forward due to the (lateral force).

As an aspect of the present invention, the rib is formed as a front guide rib that extends in the vehicle width direction adjacent to the second front cross member from the front side and guides the second front cross member from the front side . The front cross member is fitted between the guide ribs on each of the front and rear sides.

According to the above configuration, the second front cross member is described above by connecting the second front cross member to the connection portion of the second front cross member in a state of being fitted between the guide ribs on the front and rear sides. As such, it is possible to more effectively prevent the center in the vehicle width direction from bending so as to protrude forward.

According to the present invention, while reducing the weight of the vehicle and the number of parts, the shock absorbing function in front of the subframe at the time of a front collision of the vehicle is enhanced, and the main body member of the subframe is passed from the suspension link to the support portion while the vehicle is running. It is possible to suppress the deformation of the main body member of the subframe with respect to the load in the vehicle width direction input to.

The perspective view of the front part of the vehicle body provided with the subframe structure of this embodiment. The side view of the front part of the vehicle body provided with the subframe structure of this embodiment. The plan view of the front part of the vehicle body provided with the subframe structure of this embodiment. A perspective view of the main body member of the subframe and its surroundings as viewed from the inside in the vehicle width direction and diagonally above the rear. A perspective view of the main body member of the subframe as viewed from the outside in the vehicle width direction and diagonally above the front. An exploded perspective view of the main body member of the subframe and a part of the second front cross member as viewed from below. A side view of the main body member of the subframe in which the PT mount and the holding member are disassembled, as viewed from the outside in the vehicle width direction. Bottom view of the main body member of the subframe. A side view (a) and a sectional view taken along line BB (b) in FIG. 8 when the main body member of the subframe is viewed from the inside in the vehicle width direction. The front view (a) and the rear view (b) of the main body member of a subframe. An enlarged bottom view (a) of a main body member of a subframe provided with a holding member, and an enlarged side view (b) of a main part seen from the outside in the vehicle width direction. FIG. 3 is an enlarged sectional view taken along line AA in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the figure, arrow F indicates the front of the vehicle, arrow R indicates the right side of the vehicle, arrow L indicates the left side of the vehicle, arrow U indicates the upper side of the vehicle, arrow OUT indicates the outside in the vehicle width direction, and arrow IN indicates the outside in the vehicle width direction. It shall indicate the inside in the vehicle width direction.

1 to 3 show a front vehicle body structure including the subframe 10 of the present embodiment of the present invention. First, as a prerequisite structure of the subframe 10 of the present embodiment, mainly FIGS. 1 to 1 to 3 are shown. This will be described with reference to FIG.

As shown in FIGS. 1 and 2, front side frames 1 formed of frame members as strength members extending in the front-rear direction of the vehicle body are provided on both left and right sides of the engine room E (see FIG. 3). A dash cross 5 extending in the vehicle width direction is connected to the rear portion of the pair of left and right front side frames 1.

In this embodiment, the drive system is front engine rear drive (FR), and as shown in FIG. 3, the engine room E between the front side frames 1 is connected to the vertically arranged type engine 3 and the rear portion thereof. A power train 2 equipped with a transmission 4 is arranged.

As shown in FIGS. 1 and 2, each front side frame 1 has a front straight portion 1a extending linearly forward from the dash cross 5, and an inclined portion 1b descending rearward from the dash cross 5 toward the rear of the vehicle body. A rear straight line portion 1c that extends linearly rearward from the lower end of the inclined portion 1b and is connected to a floor frame (not shown) is provided. As shown in FIG. 2, each front side frame 1 is formed so that the rear straight portion 1c is lower than the front straight portion 1a.

As shown in FIGS. 1 and 2, a pair of left and right main crash cans 8 made of a cylindrical body or the like that absorbs an impact at the time of a collision via a set plate 6 and a mounting plate 7 at the front end of each front side frame 1. Is provided. A bumper reinforcement 9 extending in the vehicle width direction is attached to the front end faces of the pair of left and right main crash cans 8.

Below each front side frame 1, a subframe 10 that supports the lower arm 100 of the suspension device is arranged.

As shown in FIGS. 1 to 3, the subframe 10 mainly includes a pair of left and right subframe main body members 20 (hereinafter, abbreviated as “main body member 20”), a pair of left and right extension frames 12, and a first. It includes a second front cross member 13, 14 (see FIGS. 1 and 3) and a rear cross member 15 (see FIG. 3).

As shown in FIG. 2, the main body member 20 extends along the vehicle front-rear direction, and is downward with respect to the front side frame 1 from the intermediate position of the front straight portion 1a in the vehicle front-rear direction to the inclined portion 1b. As shown in FIG. 3, the front end of the main body member 20 is arranged in front of the front end of the engine 3. The details of the main body member 20 will be described later.

The extension frame 12 is a frame member as a front collision load absorbing member extending linearly forward from the front end portion of the main body member 20, and as shown in FIG. 2, the front portion of the front straight portion 1a of the front side frame 1 It is arranged below.

A connecting member 16 is connected to the front end portion of the extension frame 12, and a first front cross member 13 bridging between the pair of left and right connecting members 16 in the vehicle width direction extends linearly.

Further, as shown in FIG. 3, the rear surface of the sub-crash can 19 extending in the front-rear direction of the vehicle is connected to the front surface of the connecting member 16 via the set plate 18 and the mounting plate 17. A sub-bumper beam 11 is provided in front of the sub-crash can 19. The sub-bumper beam 11 is a so-called foot sweep member that prevents a secondary collision by paying the pedestrian's leg and tilting the pedestrian onto the bonnet when the vehicle collides with the pedestrian.

As shown in FIG. 2, the connection member 16 is formed in a tower shape extending upward with respect to each connection point with the first front cross member 13 and the extension frame 12. Further, the connecting member 16 is formed in a hollow box shape, and the upper surface portion of the outer portion in the vehicle width direction is attached to the lower surface of the front side frame 1 via a mount bush by a fastening member (not shown). As a result, a front vehicle body mounting portion 71 is configured on the upper portion of the connecting member 16.

Further, as will be described later, the portion of the main body member 20 extending in the front-rear direction of the vehicle toward the outside in the vehicle width direction, which is not shown on the lower surface of the front side frame 1, also in the middle and rear ends of the vehicle in the front-rear direction. A vehicle body mounting portion (intermediate vehicle body mounting portion 72, rear vehicle body mounting portion 73) to be attached by a fastening member is provided (see FIGS. 1 to 3).

As described above, the subframe 10 is attached to the front side frame 1 by the intermediate vehicle body mounting portion 72, the rear vehicle body mounting portion 73, and the front side vehicle body mounting portion 71 described above.

That is, with respect to the main body member 20 of the subframe 10, a configuration is adopted in which the subframe 10 is attached to the front side frame 1 at two locations, an intermediate portion (intermediate vehicle body mounting portion 72) and a rear portion (rear vehicle body mounting portion 73) in the vehicle front-rear direction. The front portion of the main body member 20 is configured not to be provided with a vehicle body mounting portion to be attached to the lower surface of the front side frame 1 (see FIG. 2).

The main body member 20 of the subframe 10 has, in addition to the vehicle body mounting portions 72 and 73 described above, a support function of the lower arm 100 and a support function of the power train 2 described later.
Here, as shown in FIG. 3, the lower arm 100 is a suspension arm provided in the lower portion of a suspension device (not shown), and has a front arm portion 101 extending substantially parallel to the vehicle width direction and a vehicle width direction of the front arm portion 101. It has a rear arm portion 102 extending inward in the vehicle width direction and substantially horizontally from the middle portion of the vehicle, and is formed in a substantially L-shape in a plan view. A front connecting portion 101a connected to the front side of the main body member 20 and a rear connecting portion 102a connected to the rear side are formed at the inner ends of the front and rear arm portions 101 and 102 in the vehicle width direction. (See FIGS. 1 to 3).

Hereinafter, the subframe 10 will be described with reference to FIGS. 1 to 12 centering on the main body member 20. Since the pair of left and right subframes 10 have a symmetrical shape, the description will be described below based on the configuration on the left side unless otherwise specified.

As shown in FIGS. 3 and 4, the main body member 20 of the subframe 10 has a front portion 21 to which the extension frame 12 and the second front cross member 14 are connected and a rear portion 61 to which the rear cross member 15 is connected. It is an aluminum block made of one member integrally molded by casting such as aluminum die casting, which has an intermediate portion 31 connecting the front portion 21 and the rear portion 61.

As shown in FIGS. 5 and 6, in the front portion 21, the insertion portion 22 into which the rear portion of the extension frame 12 (see FIGS. 1 to 4) is inserted is directed from the front end to the rear of the front portion 21 outside and in the front portion in the vehicle width direction. It is formed in a concave shape. Then, as shown in FIGS. 1 to 4, the extension frame 12 is integrally connected to the main body member 20 by inserting the rear portion into the insertion portion 22.

As shown in FIGS. 4 to 6 and 8, the inner edge of the front portion 21 in the vehicle width direction extends inward in the vehicle width direction from the rear portion, and the second front cross member 14 extends in the vehicle width direction. A guide recess 23 is provided to fit and connect the outer end portion.

The guide recess 23 includes an upper wall portion 23a so that the second front cross member 14 can be fitted, a pair of guide side wall portions 23b and 23c extending downward from both front and rear ends of the upper wall portion 23a, and the vehicle width direction of the upper wall portion 23a. The outer wall portion 23d in the vehicle width direction extending downward from the outer end is formed into a concave shape that opens downward and inward in the vehicle width direction corresponding to the shape of the outer end portion in the vehicle width direction of the second front cross member 14. (Especially see Figure 6).

Then, as shown in FIGS. 4 and 6, the second front cross member 14 is integrally attached to each of the wall portions 23a to 23c by welding or the like with the outer end portion in the vehicle width direction fitted in the guide recess 23. It is joined. As a result, the second front cross member 14 extends linearly between the front portions of the pair of left and right main body members 20 so as to bridge them in the vehicle width direction (see FIG. 3).

In particular, the pair of front and rear guide side wall portions 23b and 23c extend in the vehicle width direction adjacent to the second front cross member 14 from each front and rear side, and guide the second front cross member 14 from the front and rear side guide ribs. , Each is formed as a rear guide rib. As a result, the second front cross member 14 is joined to the front portion 21 in a state of being guided by the pair of front and rear guide side wall portions 23b and 23c.

As shown in FIGS. 3 to 8, on the outer side of the front portion 21 in the vehicle width direction, a front connecting portion 101a (see FIGS. 3 and 4) provided at the inner end of the front arm portion 101 of the lower arm 100 in the vehicle width direction is provided. A front support portion 24 that swingably supports is formed.

Specifically, as shown in FIGS. 5 to 8, the front support portion 24 is formed so as to project in a flange shape to the outside in the vehicle width direction at intervals in the vehicle front-rear direction on the outside in the vehicle width direction of the front portion 21. The front and rear mounting portions 241,242 are formed by the mounting portions 241,242 of the above, and the bolt fastening holes 241a and 242a (see FIG. 8) are formed through the pair of front and rear mounting portions 241,242, respectively, in the vertical direction.

On the other hand, as shown in FIGS. 3 and 4, the front connecting portion 101a of the lower arm 100 includes a shaft member 26 extending parallel to the vehicle front-rear direction inserted into the elastic bush 25 embedded in the front connecting portion 101a. There is. The shaft member 26 is formed in a flat flange shape on both sides with respect to the elastic bush 25 in the axial direction so as to be able to support the bolt head, and is installed on the upper surface of the mounting portions 241,242 on each of the front and rear sides. It is fastened and fixed by bolts or the like at the bolt fastening holes 241a and 242a.

As a result, the shaft member 26 extends in the vehicle front-rear direction so as to straddle between the pair of front and rear mounting portions 241,242, and the elastic bush 25 embedded in the front connecting portion 101a can be swung by the shaft member 26. It is supported by.

As described above, the extension frame 12 is connected to the above-mentioned insertion portion 22 (see FIGS. 5 and 6) formed on the front surface of the main body member 20 toward the outside with respect to the intermediate position in the vehicle width direction. , At least a part in the vehicle width direction overlaps with the front support portion 24 having high rigidity such as having a fastening portion for fastening the front connecting portion 101a of the lower arm 100. As a result, the main body member 20 enhances the shock absorbing function of the extension frame 12 when the vehicle hits the front.

As shown in FIGS. 4 and 6, at least the front portion 21 of the main body member 20 in the vehicle front-rear direction is integrally formed with a front overhang portion 27 that projects inward in the vehicle width direction with respect to the base portion extending in the vehicle front-rear direction. Has been done.

The front overhanging portion 27 is a second front cross member 14 with respect to the main body member 20 when a force (lateral force) in the vehicle width direction is input from the lower arm 100 to the main body member 20 of the subframe 10 while traveling. It is configured as a displacement suppressing means for suppressing relative displacement.

More specifically, when a force (lateral force) in the vehicle width direction is input from the front wheels to the main body member 20 of the subframe 10 via the lower arm 100 while the vehicle is traveling, the pair of left and right main body members 20 are subjected to. There is a possibility that a load (see arrow F1 in FIG. 3) that narrows the distance between each other in the vehicle width direction acts.

Along with this, there is a concern that a load such that the central portion in the vehicle width direction bulges and deforms forward is input to the second front cross member 14 from the pair of left and right main body members 20 (FIG. See the second front cross member 14 shown by the virtual line in 3.).

By the way, in the present embodiment, priority is given to crushing the extension frame 12 to the rear end side against the impact load at the time of front collision, and as described above, the front portion of the main body member 20 of the subframe 10 is covered. A configuration is adopted in which the vehicle body mounting portions (71, 72, 73) are not provided (see FIGS. 2 and 3). In particular, in the case of such a configuration, the rigidity of the front portion of the main body member 20 tends to be lower than that of the configuration in which the vehicle body mounting portion is provided on the front portion of the main body member 20, and therefore, as described above, the vehicle is running. It may be more difficult to secure the rigidity of the main body member 20 with respect to the force applied from the lower arm 100 in the vehicle width direction.

Therefore, in the present embodiment, as described above, the front overhanging portion 27 is provided at least on the front portion 21 of the main body member 20.

As shown in FIGS. 4, 6, and 8, the front overhanging portion 27 has a guide recess 23 to be joined with the second front cross member 14 fitted therein, and the guide recess 23 behind the guide recess 23. It is integrally formed with the reinforcing overhanging portion 271 that reinforces the above.

Of the front overhanging portions 27, the reinforcing overhanging portion 271 extends from the front to the trailing edge of the guide recess 23 from the rear side supporting portion 67 (see FIGS. 2 and 3) that supports the rear connecting portion 102a of the lower arm 100. Within the range of, the base portion of the main body member 20 (the central portion in the vehicle width direction extending in the vehicle front-rear direction) extends inward in the vehicle width direction.

The reinforcing overhanging portion 271 of the present embodiment is formed in a range from the inner side wall in the vehicle width direction of the intermediate portion 31 (accommodation portion 33 described later) to the trailing edge of the guide recess 23 (FIGS. 4, 6, 6). 8). Further, the reinforcing overhanging portion 271 is integrally formed with the trailing edge of the guide recess 23 so that its front end has substantially the same extending length inward in the vehicle width direction as the guide recess 23, and gradually increases toward the rear of the vehicle. It is formed in an inclined shape in a plan view so that the inward extension length in the vehicle width direction is shortened.

As shown in FIGS. 1, 2, 4, 7, 9, 9 (a), 10 (a), (b), 11 (b), and 12, the main body member 20 of the subframe 10. The intermediate portion 31 of the above forms a bulging portion 32 in which substantially the entire portion bulges above the front portion 21.

As shown in FIGS. 4 to 8, FIGS. 9 (a) and 9 (b), FIGS. 10 (a) and 10 (b), FIGS. 11 (a) and 12 (b), and FIG. An accommodating portion 33 for accommodating the mount support structure 36 (PT mount 36) (see FIG. 12) connected to the PT side bracket 201 (see FIG. 12) provided on the side is provided from below.

As shown in FIGS. 4, 6, 9 (a) and 9 (b), 10 (a) and 12 (b), the accommodating portion 33 has an upper wall portion 331 that forms a part of the bulging portion 32. It is formed in a hollow shape having a storage space 33s (see FIGS. 6, 8, 9 (b), and 12) opened downward by the side wall portion 332.

As shown in FIGS. 4, 5, 8, and 10 (b), the bulging portion 32 extends horizontally from the outer edge of the upper wall portion 331 of the accommodating portion 33 in the vehicle width direction to the outside in the vehicle width direction. An intermediate overhanging portion 34 is formed.

As shown in FIGS. 4, 5, 7, and 9 (a), the above-mentioned intermediate vehicle body mounting portion 72 is provided at the corner portion between the leading edge and the outer edge in the vehicle width direction in the plan view of the intermediate overhanging portion 34. It is erected in a columnar shape (cylindrical shape) so as to project upward. The intermediate vehicle body mounting portion 72 is attached to the lower surface of the rear portion of the front straight line portion 1a of the front side frame 1 by bolts, and is arranged so as to be substantially the same height as the height of the front vehicle body mounting portion 71. (See FIGS. 1 and 2).
As shown in FIGS. 4 and 5, a raised portion 35 that rises upward with respect to the peripheral portion thereof is formed in the front portion of the intermediate overhanging portion 34, and strictly speaking, the intermediate vehicle body mounting portion 72 is formed. It is erected from the upper surface of the raised portion 35.

As shown in FIG. 12, the inner surface (the surface facing the accommodation space 33s) of the side wall portion 332 of the accommodation portion 33 is formed in an inclined shape in which the upper portion is inclined inward in the vehicle width direction with respect to the lower portion. Further, as shown in FIGS. 4, 10 (a) and 12 (b), the upper wall portion 331 of the accommodating portion 33 has an inclined shape so that the inner side in the vehicle width direction is located downward with respect to the outer side in the vehicle width direction. Is formed in.

Along with these, the PT mount 36 is accommodated in the accommodating portion 33 in an inclined posture in which the upper portion thereof is inclined inward in the vehicle width direction with respect to the lower portion (see FIG. 12).

As shown in FIG. 12, the PT mount 36 is composed of a housed member 37 whose entire portion is housed in the housed portion 33, and a hard core member 38 housed inside the housed member 37.

The accommodating member 37 is provided in a lower portion thereof, and is composed of a bowl-shaped outer shell portion 371 that opens upward and a mount rubber member 372 that is fitted into the outer shell portion 371 from above. The mount rubber member 372 has a body portion 372a, a shoulder portion 372b, and a neck portion 372c in this order from the bottom to the top, and is integrally formed with an elastic material such as rubber in a vertical cross-sectional stepped shape.

The housed member 37 has an internal space corresponding to each diameter of the outer shell portion 371, the body portion 372a, the shoulder portion 372b, and the neck portion 372c, and is formed into a hollow substantially truncated cone shape as a whole. In the housed member 37, the neck portion 372c projects upward with respect to the shoulder portion 372b, and the internal spaces 372s of the shoulder portion 372b and the neck portion 372c communicate with each other in the vertical direction. Further, at the upper end of the neck portion 372c, an opening portion 372d in which the internal space 372s opens upward is formed.

The core member 38 is housed in the internal space 372s from the shoulder portion 372b to the neck portion 372c of the housed member 37, and the lower portion thereof is formed to have a larger diameter than the upper portion corresponding to the internal space of the shoulder portion 372b. It is engaged with the upper wall of the internal space of the shoulder portion 372b.

On the other hand, the upper portion of the core member 38 projects upward from the opening 372d. As shown in FIGS. 3, 4, and 12, the PT bracket attached to the upper portion of the core member 38 is attached to the PT side bracket 201 (connected portion) extending outward in the vehicle width direction from the power train 2 side. A mounting protrusion 39 is provided.

In FIG. 3, only the PT mount 36 provided on the left side of the pair of left and right subframes is shown, and the PT mount 36 is omitted in the drawings other than FIGS. 4, 3, and 12. ..

In the central portion of the upper wall portion 331, a neck portion insertion hole 372c1 through which the neck portion 372c provided in the accommodation member 37 accommodated in the accommodation portion 33 is inserted is formed through. The neck portion insertion hole 372c1 is formed to have a smaller diameter than the shoulder portion 372b provided in the accommodating member 37.

As a result, the shoulder portion 372b is engaged with the peripheral edge of the neck portion insertion hole 372c1, so that the accommodation member 37 does not come out from the accommodation space 33s of the accommodation portion 33 through the neck portion insertion hole 372c1.

The projecting piece 39 for attaching the PT bracket provided on the core member 38 projects upward from the opening 372d of the neck portion 372c in a state where the accommodating member 37 is accommodated in the accommodating portion 33, and protrudes upward from the opening portion 372d of the neck portion 372c with respect to the PT side bracket 201. Connected by fastening with bolts or the like, the PT mount 36 elastically supports the PT side bracket 201 from below.

When the PT side bracket 201 vibrates significantly while the vehicle is running, the PT mount 36 is elastically deformed and the rubber member 380 (buffer member) (see FIG. 12) provided on the upper surface of the upper wall portion 331 is used. The PT side bracket 201 is supported from the lower side (position is restricted so as not to be further lowered) by the upper wall portion 331.

Since the upper wall portion 331 of the accommodating portion 33 is integrally formed as a part of the main body member 20 formed of the aluminum block, the PT side bracket 201 can be supported with high support rigidity.

Further, the lower portion of the accommodating portion 33 is slightly open toward the outside in the vehicle width direction with respect to the vertical downward direction. The accommodating portion 33 is not formed until it reaches the lower end position Pd (bottom portion) (see FIG. 12) of the main body member 20, and as shown in FIGS. 5 to 8, FIG. 9 (b), and FIG. An opening 33a (see FIG. 9B) located at the lower end of the accommodating portion 33 is formed at a position higher than the bottom surface.

As shown in FIG. 12, the subframe 10 further includes a holding member 40 that holds the PT mount 36 housed in the housing section 33 from below.

As shown in FIGS. 5, 7, 11 (a) and 12 (b), the holding member 40 includes a disk-shaped bottom wall portion 41 that closes the opening 33a of the accommodating portion 33, and the bottom wall. It has a side wall portion 42 that rises upward from the outer peripheral edge of the portion 41, and flange portions 43, 44 (see FIG. 7) that protrude forward and backward from each of the front and rear sides and have bolt insertion holes 43a, 44a formed. It is integrally molded by casting such as aluminum die casting. The bottom wall portion 41 is provided with a plurality of ribs 45 that project downward from the lower surface portion (bottom surface portion) and extend in front and rear of the vehicle at intervals in the vehicle width direction.

Further, as shown in FIG. 8, mounting seat surfaces 30a and 30b for mounting the holding member 40 are formed on the front and rear edges of the peripheral edge of the opening 33a, and the mounting seat surfaces 30a and 30b on each of the front and rear sides are formed. Is formed flat at a position one step higher than the bottom surface of the main body member 20 (see FIG. 9B), and bolt insertion holes 30aa and 30bb are formed, respectively.

Then, the holding member 40 is fastened and fixed to the mounting seat surfaces 30a and 30b corresponding to the front and rear flange portions 43 and 44 by bolts from the lower side (see FIG. 7), so that the holding portion 33 is accommodated. The housed member 37 in the state of being housed in is closing the opening 33a so as not to fall off from the opening 33a (see FIGS. 11 (a) and 11 (b)).

As shown in FIGS. 11B and 12, the holding member 40 holds the PT mount 36 from below at a position higher than the bottom surface portion of the main body member 20 (see the bottom surface position Pd in FIG. 12). .. Specifically, as shown in FIG. 11B, the holding member 40 has a mounting height in which at least a part of the holding member 40 is included in the range of the vertical thickness t of the extension frame 12 extending forward. By the way, in other words, it is attached to the accommodating portion 33 of the main body member 20 at an attachment height that overlaps with the extension frame 12 in the vertical direction.

Further, as shown in FIG. 12, an engaging recess 40a is formed on the inner peripheral surface of the side wall portion 42 of the holding member 40, and the outer peripheral surface of the outer shell portion 371 provided in the lower part of the PT mount 36 is formed on the outer peripheral surface. The engaging convex portion 37a is formed. The PT mount 36 is accommodated in the accommodating portion 33 in a state where the engaging convex portion 37a is engaged with the engaging concave portion 40a and is installed on the upper surface of the bottom wall portion 41 of the holding member 40 (see FIG. 12). ).

As shown in FIGS. 4, 6 and 9 (a), among the side wall portions 332 (332a, 332b) of the accommodating portion 33, the side wall portion 332a (vehicle width inner side wall portion 332a) located inside in the vehicle width direction is , The outer peripheral surface of the barrel shape is formed so as to form a part of the outer peripheral surface of a substantially cylindrical shape that protrudes inward in the vehicle width direction and extends in the vertical direction with respect to the vehicle width outer edge 331a (see FIG. 4) of the upper wall portion 331. Has and formed.

On the other hand, as the inner surface of the side wall portion 332 of the accommodating portion 33 is formed in an inclined shape in which the upper portion is inclined inward in the vehicle width direction with respect to the lower portion as described above, the upper side of the side wall portion 332 of the accommodating portion 33 is formed. The side wall portion 332b (vehicle width outer wall portion 332b) located outside in the vehicle width direction with respect to the vehicle width outer edge 331a (see FIG. 4A) of the wall portion 331 is shown in FIGS. 5 to 7 and 10 (a). (B) As shown in FIG. 12, the lower portion is formed so as to protrude outward in the vehicle width direction with respect to the upper portion.

As shown in FIGS. 5, 7, 8, 10 (a) and 12 (b), and 12, there are a plurality of reinforcing portions between the accommodating portion 33 and the intermediate vehicle body mounting portion 72. Reinforcing ribs 51a and 51b are provided.

Specifically, of the reinforcing ribs 51a and 51b, the reinforcing ribs 51a extending in the vertical direction have the lower surface of the intermediate overhanging portion 34 located at the base end of the intermediate vehicle body mounting portion 72 and the vehicle width located below the intermediate vehicle body mounting portion 72. It is formed linearly in the vertical direction so as to connect to the outer surface of the outer side wall portion 332b, and a plurality of them are arranged at intervals in the front-rear direction of the vehicle (see FIG. 5).

As shown in FIG. 8, the reinforcing rib 51a extending in the vertical direction is formed so that the protrusion length outward in the vehicle width direction gradually increases upward with respect to the vehicle width outer wall portion 332b of the accommodating portion 33. The upper end portion extends in the vehicle width direction to the outer end of the intermediate overhanging portion 34 in the vehicle width direction.

Further, at each intermediate portion of the plurality of reinforcing ribs 51a extending in the vertical direction in the vertical direction, reinforcing ribs 51b extending substantially horizontally in the vehicle front-rear direction are formed so as to cross the reinforcing ribs 51a. A plurality of reinforcing ribs 51a extending in the vertical direction by the reinforcing ribs 51b extending in the vertical direction are connected to each other.

As shown in FIG. 8, the plurality of reinforcing ribs 51a and 51b described above and the intermediate vehicle body mounting portion 72 are both located outside in the vehicle width direction with respect to the accommodating portion 33 (opening 33a) when viewed from the bottom surface of the main body member 20. It is arranged adjacent to each other.

As shown in FIGS. 4 to 7, the rear portion 61 of the main body member 20 has a rear portion front side 62 extending substantially linearly along the vehicle front-rear direction and a rear end of the rear portion front side 62 with respect to the vehicle front-rear direction. It is integrally formed with a rear portion rear side 63 that is inclined outward in the vehicle width direction toward the rear and extends substantially linearly.

Further, as shown in FIGS. 4, 5, 7, and 9 (a), the rear portion 61 of the main body member 20 has a vertical wall portion 64 that rises upward with respect to the upper surface of the base portion of the rear portion 61. It is formed. The vertical wall portion 64 extends in the vehicle front-rear direction from the front end thereof to the front portion of the rear portion rear side 63 at the vehicle width direction outer edge portion of the rear portion front side 62 of the rear portion 61, and gradually decreases rearward. As shown in the side view, it is formed in an inclined shape.

The front end of the vertical wall portion 64 is integrally formed with the accommodating portion 33 so as to continuously extend rearward from the rear end of the side wall portion 332 of the accommodating portion 33, and is integrally formed with the upper wall portion 331 of the accommodating portion 33. It is formed at the same height. Further, at the upper end portion of the vertical wall portion 64, an eaves portion 64a protruding inward in the vehicle width direction from the front end thereof to the intermediate portion in the vehicle front-rear direction is formed. As shown in FIGS. 4, 9 (a), and 10 (a), the corner portion between the inner surface of the vertical wall portion 64 in the vehicle width direction and the upper surface of the base portion of the rear portion front side 62 is connected between them. A plurality of reinforcing ribs 65 are erected at intervals in the front-rear direction of the vehicle.

As shown in FIGS. 5 to 8, 9 (a), and 10 (a), the outer corner portion (inner angle portion in a plan view) of the rear portion front side 62 and the rear portion rear side 63 in the vehicle width direction is A rear overhanging portion 66 extending outward in the vehicle width direction is formed. The rear end of the rear overhanging portion 66 extends rearward along the rear portion rear side 63 to the rear portion of the rear portion 61 of the main body member 20.

As shown in FIG. 8, on the outer side of the rear portion 61 in the vehicle width direction, a rear connecting portion 102a (see FIG. 2) provided at the inner end of the rear arm portion 102 of the lower arm 100 in the vehicle width direction is swingably swingable. A rear support portion 67 for supporting is formed.
Specifically, as shown in FIGS. 1 to 3, the rear support portion 67 includes a lower arm rear support bracket 67A.

As shown in FIGS. 7 and 8, the lower arm rear support bracket 67A is provided with mounting flange portions 67a and 67b to be attached to the main body member 20 of the subframe 10 on each of the front and rear sides thereof, and a pair of front and rear mounting flanges are provided. Of the portions 67a and 67b, the front mounting flange portion 67a is provided with bolts through bolt fastening holes 67aa (see FIGS. 5, 7, and 9 (a)) formed on the outer wall surface of the vertical wall portion 64 in the vehicle width direction. On the other hand, the rear mounting flange portion 67b is fastened and fixed via bolts to the bolt fastening holes 67bb (see FIGS. 6 and 8) formed in the rear overhanging portion 66.

The rear connecting portion 102a of the lower arm 100 is connected to the rear supporting portion 67 by inserting the shaft member 68 extending rearward into the elastic bush 69 (see FIG. 4) provided inside the lower arm rear support bracket 67A. It is supported by the axis.

As a result, the front connecting portion 101a and the rear connecting portion 102a of the lower arm 100 are arranged parallel and coaxially in the front-rear direction of the vehicle.

As shown in FIGS. 3, 4, 5, and 7, a rear vehicle body is attached to the upper surface of the rear rear side 63 of the rear portion by fastening and fixing to the lower surface of the front side frame 1 via a mount bush. The portion 73 is formed.

As shown in FIG. 1, the rear vehicle body mounting portion 73 has a bolt insertion hole 73a at a position corresponding to the front portion of the rear straight portion 1c of the front side frame 1 in a plan view on the rear portion rear side 63. It is formed in a seating surface shape, and is formed at a height lower than the front vehicle body mounting portion 71 and the intermediate vehicle body mounting portion 72 so as to have a height that can be attached to the lower surface of the front portion of the rear straight portion 1c. (See Fig. 2).

The intermediate vehicle body mounting portion 72, the rear vehicle body mounting portion 73, and the front vehicle body mounting portion 71 are arranged along the vehicle front-rear direction so as to substantially coincide with each other in the vehicle width direction, and as described above, these three locations are arranged. The subframe 10 is connected to the front side frame 1 via the vehicle body mounting portions 71, 72, 73.

In particular, in the subframe 10 of the present embodiment, as described above, the vehicle body mounting portion is provided at the front end position of the main body member 20 of the subframe 10 corresponding to the substantially intermediate position between the front vehicle body mounting portion 71 and the intermediate vehicle body mounting portion 72. Instead of providing it, we have adopted a configuration in which it is attached to the front side frame 1 by three vehicle body mounting portions 71, 72, 73.

As a result, there is a possibility that the vehicle body mounting portion may prevent the extension frame 12 from being crushed to the rear end at the time of a front collision, as in the case where the vehicle body mounting portion is provided at the front end position of the main body member 20 of the subframe 10. It is possible to promote the extension frame 12 to be completely crushed to the rear end.

As shown in FIGS. 4, 6, 8, and 9 (a), the rear portion of the rear portion 61 rear portion front side 62 (in other words, the front portion of the rear portion rear side 63) is rearward in the vehicle width direction. A guide recess 74 is provided to fit and connect the outer end portion of the side cross member 15 in the vehicle width direction.

The guide recess 74 has an upper wall portion 74a into which the rear cross member 15 can be fitted, a pair of guide side wall portions 74b and 74c extending downward from both front and rear ends of the upper wall portion 74a, and outside the vehicle width direction of the upper wall portion 74a. The outer wall portion 74d in the vehicle width direction extending downward from the end is formed in a concave shape that opens downward and inward in the vehicle width direction corresponding to the shape of the outer end portion in the vehicle width direction of the rear cross member 15.

The rear cross member 15 is integrally joined to the upper wall portion 74a in a state of being fitted in the guide recess 74 by fastening. As a result, the rear cross member 15 extends linearly between the rear portions of the pair of left and right main body members 20 so as to bridge them in the vehicle width direction.

Further, as shown in FIGS. 6, 8 and 9 (b), a plurality of reinforcing ribs 81 to 88 protruding downward from the bottom surface portion of the main body member 20 of the subframe 10 are formed. .. These plurality of reinforcing ribs 81 to 88 will be described with reference to FIGS. 6, 8, 9 (b) and 12.

As shown in FIGS. 6, 8 and 12, the front portion of the main body member 20 (substantially intermediate portion of the front portion 21 in the vehicle front-rear direction) of the base portion of the main body member 20 on the inner and outer ends of the base portion in the vehicle width direction, respectively. A vehicle width inner edge rib 81 and a vehicle width outer edge rib 82 extending substantially parallel to each other and substantially continuously along the vehicle front-rear direction from the rear portion (rear end of the rear portion 61) are formed.

The vehicle width inner edge rib 81 is formed by bulging a portion corresponding to the accommodating portion 33 in the vehicle front-rear direction inward in the vehicle width direction in an arc shape so as to bypass the accommodating portion 33 in the bottom view (FIG. FIG. 6. See FIG. 8). Further, the vehicle width inner edge rib 81 is formed by the front wall guide portion 74b at a portion corresponding to the front wall guide portion 74b of the guide recess 74 for connecting the rear cross member 15 in the vehicle front-rear direction. On the other hand, the vehicle width outer edge rib 82 is formed along the vehicle front-rear direction across the intermediate portion 31 so as to be interrupted at the intermediate portion 31.

As shown in FIGS. 6 and 8, the front portion 21 has a pair of guide wall reinforcing ribs 83 extending forward from the front end of the vehicle width inner edge rib 81 so as to bifurcate in the vehicle width direction in the bottom view. 84 is formed. The pair of guide wall reinforcing ribs 83, 84 are both formed along the vehicle width direction. Of these 83, 84, the guide wall reinforcing ribs 83 (guide wall first reinforcing ribs 83) on the inner side in the vehicle width direction are formed. ) Is formed in the front overhanging portion 27 (reinforcing overhanging portion 271).

Specifically, of the pair of guide wall reinforcing ribs 83, 84, the guide wall first reinforcing rib 83 is within the vehicle width direction of the rear guide wall 23c in the guide recess 23 for connecting the second front cross member 14. The guide wall reinforcing rib 84 (guide second wall reinforcing rib 84) on the outer side in the vehicle width direction is connected to the end and is connected to the outer end in the vehicle width direction of the guide wall 23c on the rear side of the guide recess 23.
As a result, the guide wall first reinforcing rib 83, the guide second wall reinforcing rib 84, and the rear guide wall 23c form a bottom view truss shape Ta.

As shown in FIGS. 6, 8 and 9 (b), the front portion 21 is linearly along the vehicle width direction so as to connect between the vehicle width outer edge rib 82 and the vehicle width inner edge rib 81. The extending first to third bottom surface front reinforcing ribs 85a, 85b, 85c are arranged in this order in the front-rear direction of the vehicle.

As shown in FIGS. 6 and 8, the first to third bottom surface front reinforcing ribs 85a, 85b, 85c are attached to the rear mounting portion 242 of the pair of front and rear mounting portions 241,242 constituting the front support portion 24. On the other hand, it is formed in the inner peripheral portion in the vehicle width direction, and is rearward in bottom view so that the distance between adjacent vehicles in the vehicle front-rear direction gradually increases from the vehicle width outer edge rib 82 to the vehicle width inner edge rib 81. It extends radially around the mounting portion 242.

By these first to third bottom surface front reinforcing ribs 85a, 85b, 85c, the load (lateral force) in the vehicle width direction input from the front wheels to the front support portion 24 via the lower arm 100 during traveling is applied to the front portion 21. It is configured to be efficiently distributed throughout.

As shown in FIGS. 6 and 8, the reinforcing overhanging portion 271 of the front overhanging portion 27 includes a vehicle width direction inner edge reinforcing rib 86a extending along the vehicle width direction inner edge thereof and a vehicle separated by a distance in the vehicle front-rear direction. The first to third front overhanging portion reinforcing ribs 86b to 86d extending along the width direction are formed.

Further, as shown in FIGS. 6 and 12, the lower portion of the vehicle width inner side wall portion 332a of the accommodating portion 33 in the intermediate portion 31 of the subframe 10 is 2 on each side in the vehicle width direction in an orthogonal cross-sectional view in the vehicle front-rear direction. It is formed in a crotch shape, and the branch portion on the inner side in the vehicle width direction is formed by the vehicle width inner edge rib 81.

Further, as shown in FIGS. 6 and 8, the first and second bottom surface intermediate ribs 87a, which connect the bifurcated lower portion of the vehicle width inner side wall portion 332a of the accommodating portion 33 to the intermediate portion 31 of the subframe 10, 87b is formed along the vehicle width direction.

Further, as shown in FIGS. 6 and 8, in the rear portion 61, the first to seventh bottom surface rear ribs 88a to 88g connecting the vehicle width inner edge rib 81 and the vehicle width outer edge rib 82 are provided along the vehicle width direction. It is formed.

Of the 1st to 7th bottom surface rear ribs 88a to 88g, the 2nd to 6th bottom surface rear ribs 88b to 88e are applied to the moment load input from the lower arm 100 to the rear support portion 67 centering on the front support portion 24. On the other hand, in the rear portion 61, it is provided in the inner peripheral portion as a reinforcing portion for reinforcing the inner peripheral portion in the vehicle width direction with respect to the rear support portion 67.

Specifically, when a collision load is input to the lower arm 100 from the front at the time of a front collision of the vehicle, a moment load M centered on the front support portion 24 is applied to the subframe 10 via the rear support portion 67 in a plan view. It will be added to the main body member 20 (see arrow M in FIG. 8).

Such a moment load may be applied from the lower arm 100 to the main body member 20 of the subframe 10 via the rear support portion 67 depending on the front-rear force applied to the front wheels not only at the time of the front collision of the vehicle but also during traveling. be.

Therefore, in the present embodiment, the second to sixth bottom surface rear ribs 88b to 88f are subjected to the above-mentioned moment load centered on the front side support portion 24 input from the lower arm 100 to the rear side support portion 67. Is formed radially around the rear support portion 67 in a bottom view.

Specifically, of the second to sixth bottom surface rear ribs 88b to 88f, the second and third bottom surface rear ribs 88b and 88c extend linearly forward and inward in the vehicle width direction with respect to the rear support portion 67. The fourth to sixth bottom surface rear ribs 88d, 88e, 88f extend linearly to the rear and inward in the vehicle width direction with respect to the rear support portion 67.

Then, the inner edge rib 81 of the vehicle width, the outer edge rib 82 of the vehicle width, and the second and third bottom rear ribs 88b and 88c which are connected in the vehicle width direction and are adjacent to each other in the vehicle front-rear direction are substantially trussed in the bottom view. It constitutes the shape Tb.

The vehicle width inner edge rib 81, the vehicle width outer edge rib 82, and the third and fourth bottom surface rear ribs 88c and 88d which are connected in the vehicle width direction and are adjacent to each other in the vehicle front-rear direction, substantially have a truss shape Tc in the bottom view. Consists of.

Further, the vehicle width inner edge rib 81, the vehicle width outer edge rib 82, and the fourth and fifth bottom surface rear ribs 88d and 88e which are connected in the vehicle width direction and are adjacent to each other in the vehicle front-rear direction, substantially have a truss shape in the bottom view. It constitutes Td.

As shown in FIGS. 1 to 3, the subframe structure of the present embodiment described above includes a main body member 20 that supports the lower arm 100 (suspension link) and the power train 2, and extends forward from the front portion of the main body member 20. With respect to the front side frame 1 (vehicle body side frame) (see FIGS. 1 and 2) that is provided with an extension frame 12 (frame member) that absorbs a collision load from the front of the vehicle and extends in the vehicle front-rear direction at the front portion of the vehicle body. It is a subframe structure composed of a subframe 10 attached downward, and the main body member 20 has a support portion that supports the inner ends (front side connecting portion 101a and rear side connecting portion 102a) of the lower arm 100 in the vehicle width direction. (Front support portion 24 and rear support portion 67) are provided (see FIGS. 1 to 8), and a second front side extending in the vehicle width direction is provided in front of the front support portion 24 (support portion) in the main body member 20. The cross member 14 (cross member) is connected (see FIGS. 3, 4, and 6), and is in front of the rear support portion 67 (support portion) of the main body member 20 and behind the second front cross member 14. A front overhanging portion 27 is provided as a displacement suppressing means for suppressing the relative displacement of the second front cross member 14 with respect to the main body member 20 (see FIGS. 4, 6, 8 and 9 (a)). ..

[Claim 1 Example Action Effect]
According to the above configuration, the impact can be positively absorbed by the extension frame 12 in front of the subframe 10 (on the front side of the support portion of the lower arm 100 in the main body member 20) at the time of the front collision of the vehicle. Further, by eliminating the vehicle body mounting portion near the front support portion 24 of the lower arm 100, the extension frame 12 can be completely crushed without being hindered by the vehicle body mounting portion at the time of a front collision of the vehicle, so that the impact absorption of the extension frame 12 can be achieved. It can contribute to the promotion of function.

However, when the vehicle body mounting portion is removed in the vicinity of the front support portion 24, the support rigidity of the lower arm 100 is lowered by the main body member 20 during traveling, specifically, the lower arm 100 with respect to the main body member 20 during traveling. There is concern about deformation of the main body member 20 due to the load F1 (lateral force) (see the arrow F1 in FIG. 3) input inward in the vehicle width direction.

On the other hand, in the present embodiment, the relative displacement of the second front cross member 14 with respect to the main body member 20 is suppressed in the main body member 20 in front of the rear support portion 67 and behind the second front cross member 14. Since the front overhanging portion 27 (displacement suppressing means) is provided, it is possible to suppress deformation of the main body member 20 due to a load (lateral force) input inward in the vehicle width direction from the lower arm 100 to the main body member 20 during traveling.

Therefore, it is possible to achieve both the shock absorbing function at the time of a front collision of the vehicle and the support rigidity of the lower arm 100 during traveling.

As an aspect of the present invention, the displacement suppressing means covers a range from the guide recess 23 as a connection portion of the second front cross member 14 to the front of the rear support portion 67 in the vehicle front-rear direction of the main body member 20. It is formed by a front overhanging portion 27 (overhanging portion) that overhangs inward in the vehicle width direction from the range of the above, and the front overhanging portion 27 is formed by overhanging in the vehicle width direction including the guide recess 23 of the second front cross member 14. (See FIGS. 4, 6, 8, and 9 (a)).

According to the above configuration, the connection between the main body member 20 of the subframe 10 and the second front cross member 14 is strengthened, and it is possible to prevent the main body member 20 from being deformed by the input load from the lower arm 100 to the main body member 20 when the vehicle is running. ..

As an aspect of the present invention, the support portion includes a front side support portion 24 and a rear side support portion 67 that support the inner ends (front side connecting portion 101a and rear side connecting portion 102a) of the lower arm 100 in the vehicle width direction on each of the front and rear sides. (See FIGS. 1 to 8), the lower arm 100 extends in the vehicle width direction so as not to protrude forward from the front support portion 24 (see FIGS. 1 to 3), and the front overhanging portion 27 is on the rear side. It is formed in a range extending forward from the support portion 67 (see FIGS. 4, 6, 8, and 9 (a)).

According to the above configuration, the impact absorption by the extension frame 12 in front of the subframe 10 is not hindered by the lower arm 100 at the time of front collision, and the impact can be reliably absorbed by the extension frame 12.

Further, during traveling, a load in the vehicle width direction (a moment acting from the lower arm 100 to the rear support portion 67 centering on the front support portion 24) is input from the lower arm 100 to the main body member 20 via the rear support portion 67. However, the main body member 20 can be reinforced by the front overhanging portion 27 so as not to be deformed.

As an aspect of the present invention, the front overhanging portion 27 has a pair of guide side wall portions 23b, 23c as ribs extending in the vehicle width direction along the second front cross member 14, the guide wall first reinforcing ribs 83, and the first to the first. The third front overhanging portion reinforcing ribs 86b to 86d are formed (see FIGS. 6 and 8).

In this way, by reinforcing the front overhanging portion 27 portion with the ribs 23b, 23c, 83, 86b to 86d, the main body member 20 of the subframe 10 with respect to the load (lateral force) input from the lower arm 100 to the inside in the vehicle width direction. Deformation can be further suppressed.

As an aspect of the present invention, the rear guide side wall portion 23c (rib) extends from the rear side adjacent to the second front side cross member 14 in the vehicle width direction, and the second front side cross member 14 is extended from the rear side. It is formed as a guide rib on the rear side to guide (see the figure).

In this way, by guiding the second front cross member 14 from the rear side by the guide side wall portion 23c on the rear side, the main body member 20 is input from the lower arm 100 via the support portions 24 and 67 during traveling. With the load (lateral force) inside in the width direction, the second front cross member 14 bends and deforms so that the center in the vehicle width direction protrudes forward (the third shown by a virtual line in FIG. 3). 2 See the front cross member 14) can be effectively blocked.

As an aspect of the present invention, the front side wall portion 23b (rib) extends in the vehicle width direction adjacent to the second front cross member 14 from the front side, and guides the second front cross member 14 from the front side. The second front cross member 14 is fitted between the guide side wall portions 23b and 23c (guide ribs) on the front and rear sides (see the figure).

According to the above configuration, the second front cross member 14 is connected to the guide recess 23 as a connection portion of the second front cross member 14 in a state of being fitted between the guide side wall portions 23b and 23c on each of the front and rear sides. This makes it possible to more effectively prevent the second front cross member 14 from bending so that the center in the vehicle width direction protrudes forward, as described above.

The present invention is not limited to the configuration of the above-described embodiment, and can be formed in various embodiments.

1 ... Front side frame (body side frame)
2 ... Powertrain 10 ... Subframe 12 ... Extension frame (frame member)
13 ... 1st front cross member
14 ... 2nd front cross member
20 ... Main body member 23 ... Guide recess (connection part of cross member)
23b, 23c ... A pair of guide side wall portions (ribs extending in the vehicle width direction along the second front cross member)
23b ... Front side wall (front guide rib)
23c ... Rear guide side wall (rear guide rib)
24, 67 ... Support portion 24 ... Front support portion 27 ... Front overhanging portion (displacement suppressing means)
67 ... Rear support portion 83 ... Guide wall 1st reinforcing rib (rib extending in the vehicle width direction along the 2nd front cross member)
86b to 86d ... 1st to 3rd front overhanging portion reinforcing ribs (ribs extending in the vehicle width direction along the 2nd front cross member)
100 ... Lower arm (suspension link)
101a ... Front connecting part (inner end of suspension link in vehicle width direction)
102a ... Rear connecting part (inner end of suspension link in vehicle width direction)

Claims (6)

It is provided with a main body member that supports the suspension link and the power train, and a frame member that extends forward from the front portion of the main body member and absorbs a collision load from the front of the vehicle, and also has a vehicle body side that extends in the front-rear direction of the vehicle body at the front portion of the vehicle body. It is a subframe structure composed of subframes attached below the frame.
The main body member is provided with a support portion for supporting the inner end of the suspension link in the vehicle width direction.
The support portion includes a front support portion and a rear support portion that support the inner end of the suspension link in the vehicle width direction on each of the front and rear sides.
A first front cross member extending in the vehicle width direction is provided in front of the main body member, and the cross member is provided.
A second front cross member extending in the vehicle width direction is provided between the first front cross member and the front support portion of the main body member.
In the main body member, a displacement suppressing means for suppressing the relative displacement of the second front cross member with respect to the main body member is provided in front of the support portion and behind the second front cross member.
The subframe includes a vehicle body mounting portion for attaching the subframe to the vehicle body side frame.
The vehicle body mounting portion is provided behind the front support portion, and is not located between the second front cross member and the front support portion in the vehicle front-rear direction.
Subframe structure. The displacement suppressing means overhangs the range from the connection portion of the second front cross member to the front of the support portion in the vehicle front-rear direction of the main body member, and extends inward in the vehicle width direction from the other ranges. Formed by the part,
The subframe structure according to claim 1, wherein the overhanging portion is formed so as to project in the vehicle width direction including the connecting portion of the second front cross member. The suspension link extends in the vehicle width direction so as not to protrude forward from the front support portion.
The subframe structure according to claim 2, wherein the overhanging portion is formed in a range extending forward from the rear support portion. The subframe structure according to claim 2 or 3, wherein a rib extending in the vehicle width direction is formed on the overhanging portion along the second front cross member. The fourth aspect of claim 4, wherein the rib extends in the vehicle width direction adjacent to the second front cross member from the rear side and is formed as a rear guide rib that guides the second front cross member from the rear side. Subframe structure. The rib extends in the vehicle width direction adjacent to the second front cross member from the front side, and is formed as a front guide rib that guides the second front cross member from the front side. The second front cross member is front and rear. The subframe structure according to claim 5, which is fitted between the guide ribs on each side.

Images