JP2017218112A - Suspension mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspension mounting structure that is able to improve the rigidity of a suspension link while ensuring separation from a vehicle front when a load is input.SOLUTION: In a suspension link 400L connecting a side member 100L and a suspension member 300 and disposed behind a drive shaft, an upper mounting part 402 fixed to a side member 100L by a mounting bolt B has a closed cross-section. The upper mounting part 402 has a leading-end opening 410 for opening a leading end. The upper mounting part also has: a clearance 409 provided between the side of an upper face part 406 disposed in contact with the side member 100L and the side of a lower face part 407 into which the mounting bolt B is inserted from below; and a slit between a lower bolt insertion hole into which a mounting bolt B for lower face part 407 is inserted and the leading-end opening 410.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a suspension mounting structure in the front part of a vehicle.

  As a conventional suspension mounting structure at the front portion of the vehicle, front side members are disposed along the front-rear direction on the left and right sides of the vehicle body, and the front end portions of the front side members are connected to the front bumper reinforcement. On the other hand, the rear end portion of each front side member is bent downward in the vehicle and connected to the left and right side sills. Also, the suspension member is disposed below the left and right front side members so that the left and right front ends of the suspension member are connected to the front side members via suspension links, and the left and right rear ends of the suspension member. Is connected to the front side member. An engine and a transmission constituting a drive unit are disposed in an engine room surrounded by the left and right front side members, the front bumper reinforcement, and the suspension member, and a front wheel is mounted on a drive shaft that extends to the left and right.

  Here, the suspension link is constituted by a columnar member having a closed cross section from the intermediate portion to the lower mounting portion fixed to the suspension member. Further, in this suspension link, an upper mounting portion fixed to the front side member has an open cross section so as to be separated from the front side member when a load is applied to the vehicle body from the front (see, for example, Patent Document 1). .

Japanese Patent No. 4957944

  However, in the conventional suspension mounting structure, since the upper mounting portion of the suspension link has an open cross section, the rigidity of the upper mounting portion is low. For this reason, there is a problem in that the upper mounting portion is deformed by the vibration of the suspension during traveling, and the suspension member is vibrated.

  The present invention has been made paying attention to the above problem, and an object of the present invention is to provide a suspension mounting structure capable of improving the rigidity of the suspension link while ensuring separation at the time of load input from the front of the vehicle. .

In order to achieve the above object, in the suspension mounting structure of the present invention, left and right side members disposed along the longitudinal direction of the vehicle body on the left and right sides of the vehicle, and a drive unit mounted between the left and right side members, A drive shaft extending from the drive unit in the vehicle width direction and connected to the left and right drive wheels; a suspension member formed between the left and right side members and disposed below the drive unit; the left and right side members and the suspension A suspension link that connects the members and is disposed behind the drive shaft.
The suspension link includes a lower mounting portion fixed to the suspension member, an upper mounting portion fixed to the side member by mounting bolts, and an intermediate portion connecting the lower mounting portion and the upper mounting portion. The lower mounting portion, the upper mounting portion, and the intermediate portion all have a closed cross section.
Further, the upper mounting portion has an upper surface portion that is open at the tip and is in contact with the side member, and a lower surface portion that is formed with a bolt insertion hole through which the mounting bolt is inserted from below. The portion has a gap between the side portions, and the lower surface portion has a fragile portion between the bolt insertion hole and the end portion.

  Therefore, in the suspension mounting structure of the present invention, it is possible to improve the rigidity of the suspension link during traveling while ensuring separation at the time of load input from the front of the vehicle.

It is a top view which shows the front part structure of the vehicle to which the suspension mounting structure of Example 1 is applied. It is a side view which shows the front part structure of the vehicle to which the suspension mounting structure of Example 1 is applied. 1 is a perspective view illustrating a suspension link of Example 1. FIG. 1 is an exploded perspective view showing a suspension link of Example 1. FIG. 1 is a side view showing a suspension link of Example 1. FIG. FIG. 3 is a longitudinal sectional view of an upper mounting portion of the suspension link according to the first embodiment. It is a perspective view which shows the principal part of the 1st modification of the suspension link of this invention. It is a perspective view which shows the principal part of the 2nd modification of the suspension link of this invention.

  Hereinafter, a mode for carrying out the suspension mounting structure of the present invention will be described based on Example 1 shown in the drawings.

Example 1
First, the configuration of the suspension mounting structure of the first embodiment will be described by dividing it into “a front configuration of a vehicle to which the suspension mounting structure is applied” and “a detailed configuration of the suspension link”.

[Vehicle front configuration using suspension mounting structure]
FIG. 1 is a plan view showing a front structure of a vehicle to which the suspension mounting structure of Embodiment 1 is applied, and FIG. 2 is a side view. Hereinafter, based on FIG.1 and FIG.2, the front part structure of the vehicle of Example 1 is demonstrated.

  Left and right front side members 100L and 100R are disposed along the vehicle front-rear direction on the left and right sides of the vehicle. The front end portions of the left and right front side members 100L and 100R are connected to the front bumper reinforcement 200, respectively. In addition, the rear end portions of the left and right front side members 100L and 100R are curved toward the vehicle lower side and connected to the left and right side sills 500 (see FIG. 2).

  On the other hand, a suspension member 300 is disposed below the left and right front side members 100L and 100R. The suspension member 300 extends in a direction (vehicle width direction) intersecting with the left and right front side members 100L and 100R, and the left and right positions 300LF and 300RF of the front end are respectively left and right via the suspension links 400L and 400R. Are connected to the front side members 100L, 100R. The left and right positions 300LB and 300RB of the rear end portion of the suspension member 300 are directly connected to the left and right front side members 100L and 100R, respectively.

  Further, left and right connecting members 301L and 301R are attached to the left and right positions 300LF and 300RF of the front end portion of the suspension member 300, respectively. The left and right connecting members 301L and 301R extend toward the front of the vehicle, and their front end portions are connected via front end members 302 extending in the vehicle width direction. The left and right connecting members 301L and 301R are connected to the left and right front side members 100L and 100R via support brackets 303, respectively (see FIG. 2).

In the engine room E surrounded by the left and right front side members 100L and 100R, the front bumper reinforcement 200, and the suspension member 300, a drive unit K constituted by the engine 600 and the transmission 700 is disposed. ing. That is, the suspension member 300 is formed between the left and right front side members 100L and 100R, and is located in the lower rear part of the drive unit K.
A drive shaft 800 extends from the drive unit K to the left and right of the vehicle, and left and right front wheels 900L and 900R, which are drive wheels, are attached to the tip of the drive shaft 800.

  Here, the drive shaft 800 extends from the suspension links 400L and 400R to the left and right of the vehicle at a position ahead of the vehicle. That is, the suspension links 400L and 400R are arranged at the rear position of the drive shaft 800 (see FIG. 1). Further, the suspension links 400L and 400R are located on the front side of the vehicle and on the outer side of the vehicle with respect to the fixed position with respect to the suspension member 300. When it is done, it is set so that it becomes a reverse C shape with respect to the vehicle front side.

[Detailed configuration of suspension link]
FIG. 3 is a perspective view showing the suspension link of the first embodiment, FIG. 4 is an exploded perspective view, and FIG. 5 is a side view. The detailed configuration of the suspension link of the first embodiment will be described below with reference to FIGS.

As shown in FIG. 3, the suspension link 400L includes a lower mounting portion 401 fixed to a left position 300LF (see FIG. 2) of the front end portion of the suspension member 300 by mounting bolts (not shown), and a left front side member 100L. (See FIG. 2) It has an upper mounting portion 402 fixed by mounting bolts B, and an intermediate portion 403 that connects the lower mounting portion 401 and the upper mounting portion 402. As shown in FIG. 4, the suspension link 400 </ b> L includes a so-called grooved steel-shaped first member 404 having a U-shaped open section and a grooved steel-shaped second member having a U-shaped open section. The member 405 is a columnar member having a closed cross-section with the flanges 404a and 405a being in contact with each other with their open sides facing each other and bolted in a state where the flange tips 404a and 405a are in contact with each other.
Here, each of the first member 404 and the second member 405 integrally forms a portion from the lower mounting portion 401 to the upper mounting portion 402 via the intermediate portion 403. Therefore, the lower attachment portion 401, the upper attachment portion 402, and the intermediate portion 403 all have a closed cross section.

  As shown in FIG. 3 and the like, the upper mounting portion 402 has a tip opening 410 that bends in a substantially horizontal direction and opens the tip. Further, the upper mounting portion 402 has an upper surface portion 406, a lower surface portion 407 facing the upper surface portion 406, and a collar 408 interposed between the upper surface portion 406 and the lower surface portion 407.

The upper surface portion 406 is a flat surface whose outer surface 406f (surface facing the vehicle upper side) is in contact with the lower surface 101L of the left front side member 100L, and is configured by a web of the first member 404. When the suspension link 400L is fixed, the upper surface portion 406 is opposed to a bolt hole (not shown) formed in the lower surface 101L (see FIG. 5) of the left front side member 100L, and the mounting bolt B is inserted therethrough. An upper bolt insertion hole 406a is formed.
A pair of upper side surface portions 406 b and 406 b formed by the flange of the first member 404 extend from both side portions of the upper surface portion 406 toward the lower surface portion 407. Each upper side surface portion 406b is notched at an end (tip) facing the lower surface portion 407, and a gap 409 is formed between the upper side surface portion 406b and a lower side surface portion 407b of the lower surface portion 407 described later.

The lower surface portion 407 is a flat surface parallel to the upper surface portion 406, and is configured by a web of the second member 405. The lower surface portion 407 has a lower bolt insertion hole 407a and a slit 407c. The lower bolt insertion hole 407a is an opening through which the mounting bolt B is inserted when the suspension link 400L is fixed. The mounting bolt B is inserted from below into the lower bolt insertion hole 407a, and the bolt head Ba of the mounting bolt B abuts on the outer surface 407f (surface facing the vehicle lower side) of the lower surface portion 407.
The slit 407c is a cut formed by breaking the lower surface portion 407 from the lower bolt insertion hole 407a to the tip (tip opening 410) of the lower surface portion 407, and opens the lower bolt insertion hole 407a to the outside. The width of the slit 407c is set to a dimension smaller than the diameter of the bolt shaft Bb of the mounting bolt B, and the mounting bolt B will fall off from the lower bolt insertion hole 407a when the lower surface portion 407 is not deformed. Absent.

  That is, in the suspension link 400L of the first embodiment, the upper mounting portion 402 that is bolted to the left front side member 100L is formed with an upper bolt insertion hole 406a through which the mounting bolt B passes, and the left front side member 100L. An upper surface portion 406 that abuts and a lower bolt insertion hole 407a through which the attachment bolt B is inserted are formed and a lower surface portion 407 that the bolt head Ba of the attachment bolt B abuts.

On the other hand, in this lower surface part 407, the weak part is comprised by the slit 407c.
Here, the “fragile portion” means that when the drive shaft 800 moves rearward due to a load input from the front of the vehicle and contacts the intermediate portion 403 of the suspension link 400L, the lower bolt insertion hole 407a is deformed and attached. In this structure, the mounting bolt B can be removed from the lower bolt insertion hole 407a by shifting the relative position between the bolt B and the suspension link 400L. When the mounting bolt B is dropped from the lower bolt insertion hole 407a, the upper mounting portion 402 of the suspension link 400L is disconnected from the left front side member 100L.

  A pair of lower side surface portions 407 b and 407 b formed by the flanges of the second member 405 extend from the both side portions of the lower surface portion 407 toward the upper surface portion 406. Each lower side surface portion 407 b is notched at an end (tip) facing the upper surface portion 406, and a gap 409 is formed between the upper surface portion 406 and the upper side surface portion 406 b.

  The gap 409 is a space formed between the upper side surface portion 406b and the lower side surface portion 407b, and is continuous with the front end opening 410 formed at the front end of the upper mounting portion 402. By this gap 409, the lower surface portion 407 around the lower bolt insertion hole 407 a is separated from the upper surface portion 406.

  Furthermore, in the first embodiment, a plurality of claw portions 407e are formed on the inner side surface 407d of the lower surface portion 407 (the surface facing the upper surface portion 406) at the peripheral position of the lower bolt insertion hole 407a. The claw portion 407e is a protruding portion protruding from the inner side surface 407d, and a gap corresponding to the thickness of the collar 408 is provided between the claw portion 407e and the edge portion of the lower bolt insertion hole 407a.

The collar 408 is a cylindrical member that is open at both ends, and is interposed between the upper surface portion 406 and the lower surface portion 407. The inner diameter dimension of the collar 408 is substantially the same as the inner diameter dimension of the upper bolt insertion hole 406a and the lower bolt insertion hole 407a, and the mounting bolt B passes therethrough. When the upper mounting portion 402 of the suspension link 400L is bolted to the left front side member 100L by the mounting bolt B, one end 408a of the collar 408 comes into contact with the inner surface 406d of the upper surface portion 406 and the other end 408b is the lower surface portion. It contacts the inner surface 407d of 407.
That is, due to the tightening force of the mounting bolt B, the collar 408 closely contacts the inner side surface 406d of the upper surface portion 406 and the inner side surface 407d of the lower surface portion 407. Thereby, the deformation | transformation of the up-down direction of the upper surface part 406 and the lower surface part 407 is supported.

  The mounting bolt B is inserted into the lower bolt insertion hole 407a from below the lower surface portion 407, and is a bolt hole (not shown) formed in the inner side of the collar 408, the upper bolt insertion hole 406a, and the left front side member 100L. ) In order and screwed into a weld nut (not shown) provided in the left front side member 100L. At this time, the bolt head Ba contacts the outer surface 407f of the lower surface portion 407.

  Furthermore, in the first embodiment, as shown in FIG. 5, the auxiliary member 304 that stands between the suspension member 300 and the suspension link 400L and contacts the outside of the lower mounting portion 401 and the intermediate portion 403 of the suspension link 400L is provided. Is provided.

  The suspension link 400R that couples the suspension member 300 to the right front side member 100R also has the same configuration as the suspension link 400L described above, and a description thereof will be omitted.

  Next, the operation of the suspension mounting structure of the first embodiment will be described by dividing it into “operation at normal fixing”, “operation at the time of load input from the front”, and [other characteristic operations].

[Normal fixed action]
FIG. 6 is a longitudinal sectional view of the upper mounting portion of the suspension link according to the first embodiment. Hereinafter, based on FIG. 6, the normal fixing operation of the suspension mounting structure of the first embodiment will be described.

In the suspension link 400L of the first embodiment, the upper mounting portion 402 is fixed to the left front side member 100L by the mounting bolt B.
On the other hand, in the suspension link 400L, in addition to the lower mounting portion 401 and the intermediate portion 403, the upper mounting portion 402 also has a closed cross section. Then, the mounting bolt B is inserted into the lower bolt insertion hole 407a from below the lower surface portion 407 in the upper mounting portion 402, and sequentially penetrates the inside of the collar 408, the upper bolt insertion hole 406a, and the bolt hole 102, It is screwed into a weld nut 103 provided in the left front side member 100L.

That is, in the upper mounting portion 402, the mounting bolt B passes through the lower bolt insertion hole 407 a and the upper bolt insertion hole 406 a, so that the upper mounting portion 402 receives the load input from the mounting bolt B only at the upper surface portion 406. It can also be supported by the lower surface portion 407. As a result, for example, the support point of the mounting bolt B (load input point from the mounting bolt B) can be increased as compared with the case where the upper mounting portion is configured only by the upper surface portion having an open section. In the part 402, the force input from the mounting bolt B can be dispersed and supported.
As a result, the rigidity of the upper mounting portion 402 is improved, and deformation of the upper mounting portion 402 can be suppressed by the vibration of the suspension during traveling. Therefore, the rigidity of the suspension member 300 can be improved, and the vibration of the suspension member 300 can be suppressed.

Further, in the first embodiment, the collar 408 is interposed between the upper surface portion 406 and the lower surface portion 407, and one end 408a of the collar 408 is brought into close contact with the inner side surface 406d of the upper surface portion 406 by the tightening force of the mounting bolt B. The other end 408 b of the collar 408 is in close contact with the inner surface 407 d of the lower surface portion 407. Accordingly, the upper surface portion 406 and the lower surface portion 407 are supported by the collar 408, and deformation of the upper surface portion 406 and the lower surface portion 407 can be suppressed.
For this reason, the deformation of the upper mounting portion 402 due to the vibration of the suspension during traveling can be further suppressed, and the vibration of the suspension member 300 can be further suppressed.

  Note that the suspension link 400R can perform the same operation as the suspension link 400L described above, and thus the description thereof is omitted.

[Load input generation from front]
In the vehicle to which the suspension link 400L of the first embodiment is applied, when a load input is generated from the front of the vehicle, the left and right front side members 100L and 100R buckle at the front and rear portions of the engine room E. At this time, the front bumper reinforcement 200 interferes with the drive unit K, and the drive unit K moves (retreats) to the vehicle rear side. Therefore, the drive shaft 800 extending from the drive unit K also moves (retreats) to the vehicle rear side.

  Here, suspension links 400 </ b> L and 400 </ b> R are disposed at a rear position of the drive shaft 800. Therefore, the drive shaft 800 interferes with the suspension links 400L and 400R due to the load input from the front of the vehicle.

  At this time, when a predetermined load or more is applied to the suspension link 400L, the suspension link 400L tends to retreat with respect to the mounting bolt B fixed to the left front side member 100L. That is, the relative position between the mounting bolt B and the suspension link 400L tends to shift. Therefore, in the suspension link 400L, a load is input from the mounting bolt B to the periphery of the lower bolt insertion hole 407a formed in the lower surface portion 407 of the upper mounting portion 402. On the other hand, a slit 407 c is formed between the lower bolt insertion hole 407 a and the tip opening 410. As a result, the lower bolt insertion hole 407a is deformed starting from the slit 407c. As a result of this deformation, the diameter of the lower bolt insertion hole 407a is increased, the width of the slit 407c is increased, and the mounting bolt B comes out of the lower bolt insertion hole 407a through the slit 407c.

In the suspension link 400 </ b> L, a gap 409 is formed between the upper side surface 406 b of the upper surface portion 406 of the upper mounting portion 402 and the lower side surface portion 407 b of the lower surface portion 407. That is, the lower surface portion 407 in which the lower bolt insertion hole 407 a is formed has the peripheral portion of the lower bolt insertion hole 407 a separated from the upper surface portion 406.
Therefore, the deformation of the lower bolt insertion hole 407a is not hindered by the upper surface portion 406 when a load more than a predetermined value is applied to the suspension link 400L. Accordingly, the deformation of the lower bolt insertion hole 407a proceeds smoothly, and the mounting bolt B can be dropped without being caught by the upper surface portion 406.

  As described above, in the suspension link 400L of the first embodiment, when the load is input from the front of the vehicle, the mounting bolt B can be dropped from the lower bolt insertion hole 407a, and the suspension link 400L is disconnected from the left front side member 100L. Can be secured.

  The collar 408 interposed between the upper surface portion 406 and the lower surface portion 407 and through which the mounting bolt B passes is fixed by the tightening force of the mounting bolt B. Therefore, when the mounting bolt B is dropped from the lower bolt insertion hole 407a and the tightening force is reduced, the collar 408 is dropped together with the mounting bolt B. As a result, the collar 408 does not hinder the separation of the suspension link 400L from the left front side member 100L.

  When the suspension link 400L is separated from the left front side member 100L, the drive unit K can be further retracted without being interrupted by the suspension link 400L, and the rear portion of the left front side member 100L can be buckled appropriately. . Further, when the rear portion of the left front side member 100L is properly buckled, the input load from the front of the vehicle is absorbed, the buckling of the side sill 500 and the like is prevented, and the vehicle compartment ( Deformation (not shown) can be prevented.

  Further, in the suspension link 400L of the first embodiment, the gap 409 includes the tip of the upper side surface portion 406b extending from the side portion of the upper surface portion 406 toward the lower surface portion 407, and the upper surface portion from the side portion of the lower surface portion 407. It is formed by notching the tip of the lower side surface portion 407b extending toward 406. The gap 409 is continuous with the tip opening 410 of the upper mounting portion 402.

  Therefore, the gap 409 can be easily formed, and the lower surface portion 407 around the lower bolt insertion hole 407a can be completely separated from the upper surface portion 406 by being continuous with the tip opening 410. Accordingly, it is possible to reliably prevent the upper surface portion 406 from inhibiting the deformation of the lower bolt insertion hole 407a and the dropping of the mounting bolt B due to the load input from the front of the vehicle. The mounting bolt B can be quickly removed from the lower bolt insertion hole 407a through the slit 407c.

Further, in the suspension link 400L according to the first embodiment, as the weakened portion provided between the lower bolt insertion hole 407a and the tip opening 410, the lower bolt insertion hole 407a to the tip of the lower surface portion 407 (tip opening 410). A slit 407c is provided by breaking the lower surface portion 407 until. That is, the lower bolt insertion hole 407a is opened to the outside in advance.
Therefore, when the load input from the front of the vehicle is generated, if the lower bolt insertion hole 407a is deformed, the mounting bolt B can be easily dropped through the slit 407c, and the suspension link 400L from the left front side member 100L can be removed. Can be promptly separated.

  Note that the suspension link 400R can perform the same operation as the suspension link 400L described above, and thus the description thereof is omitted.

[Other characteristic effects]
In the suspension link 400L of the first embodiment, a plurality of claw portions 407e are formed on the inner surface 407d of the lower surface portion 407 of the upper mounting portion 402. The plurality of claw portions 407e are provided at positions around the lower bolt insertion hole 407a with an interval corresponding to the thickness of the collar 408 between the edge of the lower bolt insertion hole 407a.

  Therefore, when the collar 408 is interposed between the upper surface portion 406 and the lower surface portion 407, the position of the collar 408 is regulated by the plurality of claw portions 407e and positioned. As a result, it is possible to prevent the collar 408 from dropping off during assembly, or the collar 408 to be displaced and the mounting bolt B from being inserted, thereby improving the assemblability.

Next, the effect will be described.
In the suspension mounting structure of the first embodiment, the effects listed below can be obtained.

(1) Left and right side members (left and right front side members 100L and 100R) disposed on the left and right sides of the vehicle along the longitudinal direction of the vehicle body, and the left and right side members (left and right front side members 100L and 100R) ) Mounted between the drive unit K, the drive shaft 800 extending from the drive unit K in the vehicle width direction and connected to the left and right drive wheels (left and right front wheels 900L and 900R), and the left and right side members (left and right) The suspension member 300 formed between the front side members 100L and 100R and disposed below the drive unit K, the left and right side members (the left and right front side members 100L and 100R), and the suspension member 300 A suspension ring connected and disposed behind the drive shaft 800 400 L, the suspension mounting structure comprising a 400R, a,
The suspension link 400L includes a lower mounting portion 401 fixed to the suspension member 300, an upper mounting portion 402 fixed to the side member (left front side member 100L) by mounting bolts B, and the lower mounting portion 401. An intermediate portion 403 that connects the upper attachment portion 402, and the lower attachment portion 401, the upper attachment portion 402, and the intermediate portion 403 all have a closed cross-section,
The upper mounting portion 402 includes a front end opening 410 that opens the front end, an upper surface portion 406 that contacts the side member (left front side member 100L), and a bolt insertion hole (lower side) through which the mounting bolt B is inserted from below. A bottom surface portion 407 formed with a bolt insertion hole 407a),
The upper surface portion 406 and the lower surface portion 407 have a gap 409 between the side portions, and the lower surface portion 407 has the bolt insertion hole (lower bolt insertion hole 407a) and an end portion ( It was set as the structure which has a weak part (slit 407c) between front-end | tip openings 410).
Thus, it is possible to improve the rigidity of the suspension link 400L while ensuring the separation at the time of load input from the front of the vehicle.

(2) Between the upper surface portion 406 and the lower surface portion 407, one end 408a is in contact with the inner surface 406d of the upper surface portion 406, and the other end 408b is in contact with the inner surface 407d of the lower surface portion 407. And a cylindrical collar 408 through which the mounting bolt B passes is provided.
Thereby, in addition to the effect of (1), the upper surface portion 406 and the lower surface portion 407 are supported by the collar 408, and the rigidity of the suspension link 400L can be further improved.

(3) The gap 409 extends from the side surface of the upper surface portion 406 toward the lower surface portion 407 and from the side surface of the lower surface portion 407 toward the upper surface portion 406. The lower side surface portion 407b is formed by cutting out at least one tip, and is continuous with the tip opening 410 of the upper mounting portion 402.
Thereby, in addition to the effect of (1) or (2), the gap 409 can be easily formed, and the lower surface portion 407 can be completely separated from the upper surface portion 406, so that the load from the front of the vehicle can be obtained. At the time of input, the upper surface portion 406 does not hinder the deformation of the lower bolt insertion hole 407a, and the lower bolt insertion hole 407a can be quickly deformed.

(4) The fragile portion is configured by a slit 407c in which the lower surface portion 407 between the bolt insertion hole (lower bolt insertion hole 407a) and the tip of the lower surface portion 407 (tip opening 410) is broken.
As a result, in addition to any of the effects (1) to (3), if the lower bolt insertion hole 407a is deformed when a load is input from the front of the vehicle, the mounting bolt B can be easily passed through the slit 407c. The suspension link 400L can be quickly detached from the left front side member 100L.

  The suspension mounting structure of the present invention has been described based on the first embodiment. However, the specific configuration is not limited to the first embodiment, and the gist of the invention according to each claim of the claims. As long as they do not deviate, design changes and additions are permitted.

  In the first embodiment, an example in which a plurality of claw portions 407e are provided around the lower bolt insertion hole 407a formed in the lower surface portion 407 and the collar 408 can be prevented from falling off during assembly is shown. However, the present invention is not limited to this. For example, a claw portion may not be provided on the inner side surface 407d like a lower surface portion 407 ′ shown in FIG.

  In the first embodiment, the fragile portion of the lower surface portion 407 of the upper mounting portion 402 is a slit 407c in which the lower surface portion 407 between the lower bolt insertion hole 407a and the tip (tip opening 410) of the lower surface portion 407 is broken. An example configured by is shown. However, the present invention is not limited to this. For example, like the lower surface portion 407 ″ shown in FIG. 8, the fragile portion is configured by an insertion hole expanding portion 407α that expands the lower bolt insertion hole 407a toward the tip (tip opening 410) of the lower surface portion 407 ″. May be.

  That is, when the relative position between the mounting bolt B and the suspension link 400L changes due to a load input from the front of the vehicle, the fragile portion deforms the lower bolt insertion hole 407a and causes the mounting bolt B to fall off. Any shape can be used.

In the suspension mounting structure according to the first embodiment, the gap 409 of the suspension link 400L includes the tip of the upper side surface portion 406b extending from the side portion of the upper surface portion 406 toward the lower surface portion 407, and the side portion of the lower surface portion 407. An example is shown in which the tip of the lower side surface portion 407b extending from the upper surface portion 406 toward the upper surface portion 406 is cut out.
However, the present invention is not limited to this. For example, the upper surface portion 406 and the lower surface portion 407 do not have side surfaces, and the upper surface portion 406 that contacts the left front side member 100L and the lower surface on which the lower bolt insertion hole 407a is formed. Since only the portion 407 is provided, a gap may be provided between the side portion of the upper surface portion 406 and the side portion of the lower surface portion 407. Further, the gap may be provided by cutting out only one of the tip of the upper side surface portion 406b and the tip of the lower side surface portion 407b.

In the suspension mounting structure according to the first embodiment, an example in which the fragile portion (the slit 407c and the insertion hole expanding portion 407α) is provided only on the lower surface portion 407 of the upper mounting portion 402 is shown, but the present invention is not limited thereto. Also on the upper surface portion 406 in contact with the lower surface 101L of the left front side member 100L, a weak portion that triggers deformation of the upper bolt insertion hole 406a may be provided.
As a result, when a load is input from the front of the vehicle, the upper bolt insertion hole 406a can also be deformed, and the mounting bolt B can be removed more quickly, further separating the left front side member 100L and the suspension link 400L. It can be done promptly.

100L, 100R Left and right front side members 300 Suspension members 400L, 400R Suspension link 401 Lower attachment portion 402 Upper attachment portion 403 Intermediate portion 406 Upper surface portion 406a Upper bolt insertion hole 406b Upper side surface portion 407 Lower surface portion 407a Lower bolt insertion hole 407b Lower Side part 407c Slit (fragile part)
408 Collar 409 Gap 410 Tip opening 500 Side sill 800 Drive shaft 900L, 900R Left and right front wheels (drive wheels)
E Engine room K Drive unit B Mounting bolt

Claims (5)

Left and right side members disposed along the longitudinal direction of the vehicle body on the left and right sides of the vehicle, a drive unit mounted between the left and right side members, and a left and right drive extending from the drive unit in the vehicle width direction A drive shaft connected to the wheel; a suspension member formed between the left and right side members and disposed below the drive unit; and the left and right side members and the suspension member are coupled to each other and the drive shaft Suspension attachment structure comprising a suspension link disposed behind
The suspension link includes a lower mounting portion fixed to the suspension member, an upper mounting portion fixed to the side member by mounting bolts, and an intermediate portion connecting the lower mounting portion and the upper mounting portion. The lower mounting portion, the upper mounting portion and the intermediate portion all have a closed cross-section,
The upper mounting portion has an upper surface portion that is open at the tip and is in contact with the side member, and a lower surface portion that is formed with a bolt insertion hole through which the mounting bolt is inserted from below.
The upper surface portion and the lower surface portion have a gap between the side portions, and the lower surface portion has a fragile portion between the bolt insertion hole and the end portion. Suspension mounting structure. In the suspension mounting structure according to claim 1,
Between the upper surface portion and the lower surface portion, one end is in contact with the inner surface of the upper surface portion, the other end is in contact with the inner surface of the lower surface portion, both ends are opened, and the mounting bolt penetrates. A suspension mounting structure characterized in that a cylindrical collar is interposed. In the suspension mounting structure according to claim 1 or 2,
The gap includes at least an upper side surface portion extending from a side portion of the upper surface portion toward the lower surface portion, and a lower side surface portion extending from a side portion of the lower surface portion toward the upper surface portion. A suspension mounting structure, wherein the suspension mounting structure is formed by cutting out one of the leading ends and is continuous with the leading end opening of the upper mounting portion. In the suspension mounting structure according to any one of claims 1 to 3,
The fragile portion is configured by a slit that breaks the lower surface portion between the bolt insertion hole and the tip of the lower surface portion. Suspension mounting structure, In the suspension mounting structure according to any one of claims 1 to 3,
The fragile portion is constituted by an insertion hole expanding portion in which the bolt insertion hole is expanded toward the tip of the lower surface portion.