CN110949516A - Vehicle body front structure - Google Patents
Vehicle body front structure Download PDFInfo
- Publication number
- CN110949516A CN110949516A CN201910881383.0A CN201910881383A CN110949516A CN 110949516 A CN110949516 A CN 110949516A CN 201910881383 A CN201910881383 A CN 201910881383A CN 110949516 A CN110949516 A CN 110949516A
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- CN
- China
- Prior art keywords
- lower arm
- cross member
- vehicle body
- arm support
- front side
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/02—Understructures, i.e. chassis frame on which a vehicle body may be mounted comprising longitudinally or transversely arranged frame members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G7/00—Pivoted suspension arms; Accessories thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/09—Means for mounting load bearing surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
- B62D21/152—Front or rear frames
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Body Structure For Vehicles (AREA)
Abstract
The invention provides a vehicle body front structure, which is provided with a front sub-frame and improves the rigidity of a transverse force input from a lower arm. A vehicle body front structure (1) has a front subframe (6) and a lower arm (31), the front subframe having: left and right longitudinal beams (23) extending in the front-rear direction; a cross member (24) extending in the left-right direction and coupled to the left and right longitudinal members; and at least one lower arm support portion (36) provided on at least one of the side members and the cross member for swingably supporting the lower arm, wherein each of the side members has a deformation promoting portion (53) having a lower rigidity than other portions of the side member at a position forward of a joint portion with the cross member, a rear end of a front lower arm support portion disposed foremost among the lower arm support portions is disposed rearward of a front end of the cross member, and a front end of the front lower arm support portion is disposed rearward of the front end of the cross member.
Description
Technical Field
The present invention relates to a vehicle body front structure having a front subframe.
Background
As a vehicle body front structure of a four-wheeled vehicle, a structure having a pair of left and right front side frames extending in the front-rear direction and a front sub frame attached to the lower side of the front side frames is known (for example, patent document 1). The front subframe includes a pair of left and right longitudinal members extending in the front-rear direction and a cross member extending in the left-right direction and coupled to the left and right longitudinal members. The left and right longitudinal members are attached to the corresponding front sub-frames at the front and rear portions, respectively. A buckling-promoting portion that serves as a starting point of deformation when receiving a load of a frontal collision is formed at a central portion in the longitudinal direction of the side member. The side member absorbs the collision load by deforming from the buckling-promoting portion as a starting point.
Documents of the prior art
Patent document 1: japanese patent laid-open publication No. 2005-271810
When the rigidity of the subframe is low, the subframe is easily deformed by a lateral force input from the lower arm of the suspension, and the riding quality and the traveling performance are deteriorated. When the buckling-promoting portion is provided to the side member, the ride feel and the like may be further deteriorated because the rigidity of the side member is low.
Disclosure of Invention
In view of the above background, an object of the present invention is to improve the rigidity against a lateral force input from a lower arm in a vehicle body front structure having a front subframe.
In order to solve the above problem, one aspect of the present invention provides a vehicle body front structure including: a front sub-frame 6 mounted to the front of the vehicle 2; and a pair of left and right lower arms 31 of the suspension 30, which are swingably supported by the front subframe, the front subframe including: a pair of left and right longitudinal beams 23 extending in the front-rear direction; a cross member 24 extending left and right and coupled to the left and right side members; and at least one lower arm support portion 36 provided on at least one of the side members and the cross member to support the lower arm so as to be swingable, each of the side members having a deformation promoting portion 53 having a lower rigidity than other portions of the side member at a position forward of a joint portion with the cross member, a rear end of a front lower arm support portion disposed at a foremost position among the lower arm support portions being disposed rearward of a front end of the cross member, and a front end of the front lower arm support portion being disposed rearward of the front end of the cross member.
According to this structure, in the side member having the deformation promoting portion, the front lower arm support portion is disposed in the portion where the rigidity is increased by the cross member, and therefore, the front subframe can be made difficult to deform against the lateral force applied from the lower arm. This can improve the ride quality and the traveling performance. Further, the front lower arm support portion is provided at a portion that overlaps the cross member in the left-right direction, and therefore, the front subframe can be made more difficult to deform against a lateral force applied from the lower arm.
In the above aspect, the front lower arm support portion may be coupled to the side member and the cross member.
According to this structure, the rigidity of the front lower arm support portion is increased by the cross member, and the lower arm can be reliably supported. In addition, in the side member, the difference in rigidity between the deformation promoting portion and the portion of the side member behind the deformation promoting portion, where the cross member and the front lower arm support portion are provided, is increased, and therefore, the side member can be reliably deformed at the deformation promoting portion at the time of a front collision.
In the above aspect, the front lower arm support portion may be coupled to left and right outer side surfaces and an upper surface of the side member and an upper surface of the cross member.
According to this structure, the lateral force applied from the lower arm to the front lower arm support portion can be transmitted to the cross member.
In addition to the above aspect, the present invention may further include: and a pair of left and right front side frames 4 extending in the front-rear direction of the front portion of the vehicle, the front lower arm support portions extending upward from the side members and being attached to the front side frames.
According to this configuration, the lateral force applied from the lower arm to the front lower arm support portion can be transmitted to the front side frame.
In the above aspect, the front lower arm support portion may include a connecting portion 36D extending laterally outward and upward from the cross member toward the front side frame.
According to this structure, the load can be efficiently transmitted from the cross member to the front side frame.
In addition to the above-described aspect, the beam may be provided with a sleeve 47 that vertically penetrates the beam and is coupled to the upper surface and the lower surface of the beam, the steering gear box 40 may be attached to the sleeve, and the inner end of the connection portion in the left-right direction may be disposed on the side of the upper end of the sleeve.
According to this structure, the end portion of the connecting portion is provided at the portion of the cross member where the rigidity is enhanced by the bushing, and therefore, the load can be efficiently transmitted from the cross member to the front side frame.
In the above aspect, the steering gear box may extend in the left-right direction and be coupled to the upper surface of the cross member at a plurality of positions in the left-right direction.
According to this structure, the rigidity of the cross member can be increased by the steering gear box. This makes it possible to make the front subframe less likely to deform in response to lateral force input from the lower arm to the front subframe.
In the above aspect, the deformation promoting portion may be a concave portion provided on the upper surface of the side member so as to be recessed downward.
With this configuration, the deformation promoting portion that can reliably bend the side member downward can be formed with a simple configuration.
In the above aspect, the left and right outer edges of the side member may be curved so as to be recessed inward in the front-rear direction at the center portion.
With this configuration, the space for steering the front wheels can be secured to be large on the left and right outer sides of the subframe, and the steering angle of the front wheels can be increased.
In addition to the above-described aspect, the front side frame may have a front mounting portion 28 to which a portion of the side member on the front side of the deformation promoting portion is mounted, and the impact absorbing structure 12 may be provided on the front side frame on the front side of the front mounting portion.
According to this structure, the impact absorbing structure can absorb the front collision load, and the deformation promoting portion can be suppressed from deforming when the collision load is small. Thus, replacement of the front subframe can be avoided.
Effects of the invention
With the above configuration, in the vehicle body front structure including the front subframe, the rigidity against the lateral force input from the lower arm can be improved.
Drawings
Fig. 1 is a bottom view of the vehicle body structure of the embodiment.
Fig. 2 is a bottom view of the vehicle body structure with the front subframe and the rear subframe omitted.
FIG. 3 is a side view of a front portion of the vehicle body structure.
Fig. 4 is a bottom view of the front portion of the vehicle body structure.
FIG. 5 is a perspective view of the front subframe.
FIG. 6 is a left side view of the front subframe.
Fig. 7 is a cross-sectional view showing a fastening structure of the rear end portion and the rear end support portion of the front side member of the front subframe.
Fig. 8 is a plan view showing the front subframe.
Description of the reference symbols
1: a vehicle body structure;
3: a side beam;
4: a front side frame;
6: a front subframe;
23: a front longitudinal beam;
24: a front cross member;
26: a support member;
31: a lower arm;
36: a front lower arm supporting portion;
40: a steering gear box;
44: a joint portion;
51: a rear lower arm support portion;
53: a deformation promoting portion;
55: a front stabilizer;
56: a front stabilizer support portion.
Detailed Description
The vehicle body structure of the present invention will be explained below. In the following description, the front-rear direction, the left-right direction (vehicle width direction), and the up-down direction are defined with reference to a vehicle. The right and left inner sides (inner sides in the vehicle width direction) are directions toward the center of the vehicle in the right and left direction, and the right and left outer sides (outer sides in the vehicle width direction) are directions away from the center of the vehicle in the right and left direction. The frame or panel, various components that make up the vehicle body structure, unless otherwise specified, are formed of steel.
As shown in fig. 1 and 2, the vehicle body structure 1 includes: a pair of left and right side members 3 extending in the front-rear direction at the left and right side portions of the lower portion of the both side portions of the vehicle 2; a pair of left and right front side frames 4 extending in the front-rear direction of the vehicle 2 and coupled at the rear ends thereof to the front ends of the corresponding left and right side members 3; and a front sub-frame 6 mounted on the lower side of the left and right front side frames 4 for supporting the front wheels 5.
A front floor 7 facing upward and downward is provided above the left and right side members 3. As shown in fig. 3, a pair of left and right front pillars 8 are provided at front ends of the left and right side members 3. Each front pillar 8 extends vertically and is joined at a lower end to a front end of the side member 3. As shown in fig. 1 and 2, a shroud 9 facing forward and backward is provided between the left and right front pillars 8. The shroud 9 is coupled to the left and right front pillars 8 at left and right side edges, and is coupled to the front edge of the front floor 7 at a lower edge.
As shown in fig. 1 to 4, the left and right front side frames 4 include: a front side frame front portion 4A extending forward and backward at a position on the left and right inner sides and above the left and right side members 3; a front side frame intermediate portion 4B extending rearward and downward from a rear end of each front side frame front portion 4A; and a front side frame inclined portion 4C (outrigger) extending rearward and laterally outward from a rear end of each front side frame intermediate portion 4B and coupled to a front end of the corresponding side member 3.
The front side frame intermediate portion 4B has a hat-shaped cross section that opens upward, and the front side frame intermediate portion 4B is joined to the front surface of the lower portion of the apron 9 to form a closed cross-sectional structure in cooperation with the apron 9. The front side frame inclined portion 4C has a hat-shaped cross section that opens upward, and is joined to the lower surface of the front floor 7 to form a closed cross-sectional structure in cooperation with the front floor 7. The front side frame inclined portion 4C has a front-rear width that increases toward the left and right outer sides, and is coupled to the left-right inner side surfaces of the side members 3 at the left and right outer ends.
As shown in fig. 3, a bulkhead 11 is provided at the front end of the left and right front side frame front portions 4A. The separator 11 has: a pair of left and right partition side members 11A extending vertically; a partition upper member 11B extending in the left-right direction and connecting upper ends of the left and right partition side members 11A to each other; and a lower bulkhead beam 11C extending in the left-right direction and connecting the lower ends of the left and right side bulkhead beams 11A, the bulkhead 11 being formed in a quadrangular frame shape. The front end of front side frame front portion 4A is coupled to a vertically intermediate portion of the rear surface of bulkhead side member 11A.
The front bumper beam 13 extending to the left and right is coupled to the left and right bulkhead side members 11A via a pair of left and right front crush boxes 12 as shock absorbers. Each front crash box 12 is formed in a tubular shape extending forward and rearward, and is coupled at a rear end to a middle portion in the vertical direction of the bulkhead side member 11A, and is coupled at a front end to a rear side surface of the front bumper beam 13. The front crash box 12 has lower rigidity in the front-rear direction than the front side frame 4, the front bumper beam 13, and the bulkhead 11, and when a load at the time of a front collision is applied, the front crash box 12 deforms earlier than the front side frame 4 and the like to absorb an impact.
A front upper beam 15 extending forward and then extending forward and downward is provided at an upper portion of each front pillar 8. The left and right front upper rails 15 are arranged laterally outward and upward with respect to the left and right front side frame front portions 4A. The front end of each front upper member 15 is coupled to the front end of the corresponding front side frame front portion 4A via a coupling member 16 extending in the left-right direction. A front absorber case 17 is provided between the front side frame front portion 4A and the front upper frame 15 corresponding to the left and right. The front absorber housing 17 has: a vertical wall portion 17A extending upward from the rear portion of the front frame front portion 4A; and an upper wall portion 17B extending laterally outward from the upper end of the vertical wall portion 17A and joined to the front upper member 15 at the lateral outer ends.
As shown in fig. 4, the left and right front side frame intermediate portions 4B are provided with lateral extension portions 4D extending leftward and rightward, respectively. The left and right inner ends of the left and right lateral extensions 4D face each other with a gap therebetween in the left-right direction. The left and right outer ends of the left and right lateral extensions 4D are joined to the inner side surfaces of the front side frame intermediate portions 4B. The lateral extension 4D has a hat-shaped cross section that opens upward, and forms a closed cross-sectional structure in cooperation with the floor. The lateral extension 4D constitutes a part of the front side frame 4.
As shown in fig. 4 and 7, guide members 19 are provided at the left and right inner ends of the left and right lateral extensions 4D. The guide members 19 extend rearward from lower surfaces of left and right inner ends of the lateral extension portion 4D. The guide member 19 has an inclined surface 19A inclined downward rearward at its lower front portion. The lateral extension portion 4D and the guide member 19 constitute a rear end support portion 21 that supports the rear end of the front subframe 6. The lateral extension portion 4D functions as a fastening seat for fastening the rear end of the front subframe 6.
As shown in fig. 4 and 5, the front subframe 6 includes a pair of left and right front side members 23 extending in the front-rear direction, and a front cross member 24 extending in the left-right direction and coupled to each front side member 23. The left and right front side members 23 are inclined rearward and leftward and rightward so as to approach each other at a distance rearward. Further, the left and right outer edges of the front side member 23 are curved so that the central portions in the front-rear direction are recessed inward in the left and right.
The left and right ends of the front cross member 24 are coupled to the middle portion of the front side member 23 in the front-rear direction. The left and right ends of the front cross member 24 are coupled to the front side frames 23 at positions slightly forward of the center in the front-rear direction. The front side member 23 and the front cross member 24 each have a cross section of a closed cross-sectional structure. The front edge (front end) of the front cross member 24 is formed linearly in the left-right direction. The front edge of the front cross member 24 is formed linearly in the left-right direction. The rear edge of the front cross member 24 is inclined rearward toward the left and right outer sides at the left and right ends. That is, the front cross member 24 has a front-rear width that increases toward the left and right outer sides.
A support member 26 extending left and right and connecting the left and right front side members 23 is provided behind the front cross member 24. The support member 26 is formed in an X shape in plan view, and extends from a central portion to the left front, right front, left rear, and right rear. The left and right ends of the front cross member 24 are joined to the left and right ends of the front side member, and the left and right ends of the rear side member are joined to the left and right front side members 23. The support member 26 is preferably formed of a steel plate facing downward.
As shown in fig. 4, the front end of each front side member 23 is disposed below and offset to the left and right inside of the front side frame front portion 4A corresponding to the left and right. Specifically, in a plan view, the left and right outer portions of the front end of the front side frame 23 are disposed at positions overlapping the left and right inner portions of the front end of the front side frame front 4A. The front side member 23 has a front end mounting portion 23A at a front end portion thereof to be mounted to the front side frame 4. The front end attachment portions 23A are provided at the left and right outer portions of the front end of the front side member 23. The front end attachment portion 23A of each front side frame 23 and the front end of the front side frame front portion 4A corresponding to the left and right are coupled to each other by a front link member 28 extending vertically. Specifically, the front side frame 23 is fastened to the lower end of the front connecting member by a bolt inserted from below. The front connecting member 28 constitutes a front end supporting portion that supports the front end of the front subframe 6. In the present embodiment, the front end attachment portion 23A is indirectly attached to the front side frame front portion 4A via the front connection member 28. In another embodiment, the front attachment member 23A may be indirectly attached to the front side frame front portion 4A via the front connection member 28.
The rear end of each front side member 23 is disposed below the corresponding left and right lateral extension portion 4D. That is, the rear end of the front side member 23 is disposed on the left and right inner sides of the front side frame intermediate portion 4B corresponding to the left and right. As shown in fig. 7, a vertically penetrating sleeve 29A is provided at the rear end of the front side member 23. The rear end of the front side member 23 is fastened to the lower surface of the lateral extension 4D by a bolt 29B, and the bolt 29B is inserted through a sleeve 29A from below and screwed to a nut 29C coupled to the lateral extension 4D. The rear end of the front side member 23 projects rearward from the lateral extension portion 4D, and the rear edge thereof extends to the left and right. The vertical width (vertical thickness) of the rear end of the front side member 23 gradually decreases toward the rear.
The rear end of the front side member 23 faces the inclined surface 19A of the guide member 19 with a gap therebetween in the front-rear direction. In addition, the rear end of the front side member 23 is disposed at a position overlapping the inclined surface 19A of the guide member 19 in a plan view.
As shown in fig. 4, the lower surface of the rear end of the front side member 23 is connected to the lower surface of the front side frame intermediate portion 4B by a plate-like connecting member 27. The connecting member 27 deforms when a predetermined load is applied, and releases the connection between the front side frame 23 and the front side frame intermediate portion 4B.
As shown in fig. 1 and 8, a pair of left and right front suspensions 30 are provided on the front subframe 6 and the left and right front side frames 4. The front suspension 30 has: a pair of left and right lower arms 31 swingably supported by the left and right front side members 23; a pair of right and left front knuckles 32 supported by the respective lower arms 31; and a front damper 33 connecting an upper portion of each front knuckle 32 and the upper wall portion 17B of the front damper housing 17 corresponding to the left and right.
The lower arm 31 is a so-called a-arm having: an arm rear portion 31A extending obliquely from the rear end to the left and right outer sides and forward; an arm bent portion 31B bent outward in the right and left direction from the front end of the arm rear portion 31A, and an arm front portion 31C extending outward in the right and left direction from the right and left outer ends of the arm bent portion 31B and supporting the front knuckle 32 at the tip end. The arm front portion 31C is formed to have a width wider than each of the arm rear portion 31A and the arm bent portion 31B. Front axle support portions 31D protruding inward in the right and left direction are provided on the right and left inner surfaces of the arm bent portion 31B. The axis of the front axle support 31D extends forward and rearward. A rear shaft support 31E extending in the vertical direction is provided at the rear end of the arm rear portion 31A.
As shown in fig. 4, each of the left and right front side members 23 is provided with a front lower arm support portion 36 that supports the front axle support portion 31D of the lower arm 31, and a rear lower arm support portion 51 that supports the rear axle support portion 31E of the lower arm 31.
The front lower arm support portion 36 is disposed at a position overlapping the front cross member 24 in the left-right direction, and the front lower arm support portion 36 is coupled to the front side member 23 and the front cross member 24.
As shown in fig. 5, the front lower arm support portion 36 includes: a base portion 36A extending right and left on the upper side of the front side member 23 and coupled to the front side member 23 and the front cross member 24; and a front support wall 36B and a rear support wall 36C that are coupled to the base 36A and the front side member 23 and protrude from the left and right outer side surfaces of the front side member 23 to the left and right outer sides.
The base portion 36A is formed in a hollow shape by combining the front member and the rear member with each other, and is coupled to the upper surface and the left and right inner side surfaces of the front side member 23 and the upper wall of the front cross member 24. The left and right inner ends of the base portion 36A extend through the upper wall of the hollow front cross member 24 toward the inside of the front cross member 24. The base portion 36A extends upward and laterally outward from the upper surface of the front side member 23 to form left and right outer end portions. The left and right outer ends of the front side member 23 are positioned on the left and right outer sides of the left and right outer side surfaces of the front side member 23.
The right and left outer ends of the base portion 36A are coupled to the lower surface of the front side frame front 4A via brackets 39. The bracket 39 has: an upper plate portion fastened to the lower surface of the front side frame front portion 4A by vertically extending bolts; and vertical plate parts hanging from the left and right inner ends of the upper plate part. The vertical plate portion of the bracket 39 abuts left and right outer end surfaces of the left and right outer ends of the base portion 36A, and is fastened to the left and right outer ends of the base portion 36A by bolts extending in the left and right directions.
The upper portion of the base portion 36A forms an inclined portion 36D (connecting portion) of an upward slope (upward gradient) from left and right inner end portions to left and right outer end portions. That is, the inclined portion 36D extends obliquely from the front cross member 24 to the front side frame front portion 4A.
The front support wall 36B and the rear support wall 36C are plate-like members facing front and rear, and are welded to left and right outer sides of the front side member 23 at left and right inner edges thereof. The rear support wall 36C is disposed with a gap in the rear with respect to the front support wall 36B. Upper portions of left and right inner edges of the front support wall 36B extend to an upper side of the front side member 23 and are welded to a front surface of the base 36A. Upper portions of left and right inner edges of the rear support wall 36C extend to an upper side of the front side member 23 and are welded to a rear surface of the base 36A. Lower portions of left and right inner edges of the front support wall 36B and the rear support wall 36C extend to a lower side of the front side member 23, and are welded to a lower surface of the front side member 23.
As shown in fig. 8, front axle support portion 31D of lower arm 31 is disposed between front support wall 36B and rear support wall 36C. A rubber bush (not shown) is attached to the front shaft support portion 31D of the lower arm 31, and a support shaft (not shown) extending in the front-rear direction through the rubber bush is provided to the front support wall 36B and the rear support wall 36C.
As described above, the front lower arm support portion 36 has the base portion 36A, the front support wall 36B, and the rear support wall 36C, and the front lower arm support portion 36 swingably supports the front shaft support portion 31D of the lower arm 31. The front lower arm support portion 36 is welded to the front side member 23 and the front cross member 24, and is fastened to the front side frame front portion 4A via a bracket 39.
As shown in fig. 4, in a plan view, it is preferable that front support wall 36B constituting the front end of front lower arm support 36 is disposed forward of the rear ends of the left and right end portions of front cross member 24, and rear support wall 36C constituting the rear end of front lower arm support 36 is disposed rearward of the front end of front cross member 24. That is, the front lower arm support portion 36 preferably has an overlap with the front cross member 24 in the left-right direction. In the present embodiment, the front support wall 36B (the front end of the front lower arm support portion 36) is disposed rearward of the front end of the front cross member 24, and the rear support wall 36C (the rear end of the front lower arm support portion 36) is disposed forward of the rear end of the front cross member 24.
As shown in fig. 8, a steering gear box 40 is provided on the upper surface of the front cross member 24. The steering gear box 40 has a rack housing 41 having a cylindrical portion extending in the right and left direction. A rack shaft 42 is provided inside the rack housing 41 so as to be slidable in the left and right directions with respect to the rack housing 41. The rack shaft 42 has left and right end portions projecting left and right from the rack housing 41, respectively, and is connected to the left and right front knuckles 32 via tie rods 43. The rack shaft 42 is connected to a tie rod 43, for example, by means of a ball joint 44. The left and right joint portions 44 are disposed inside shields 45 attached to the left and right ends of the rack housing 41, respectively.
The left and right ends of the front side of the rack housing 41 are fastened to bushings 47 provided on the left and right front sides of the front cross member 24 by bolts. The rear portion of the rack housing 41 is fastened by bolts to one of bushings 47 provided on the left and right rear sides of the front cross member 24. The shape of the rack housing 41 differs depending on the left-right position of the steering shaft. The bushing 47 fastening the rear side of the rack housing 41 is selected according to the shape of the rack housing 41. Thus, the rack housing 41 is fastened to the front cross member 24 at three places.
The front edges (front ends) of the left and right front lower arm support portions 36 are disposed rearward of the front edge (front end) of the front cross member 24. The right and left inner ends of the inclined portion 36D of the base portion 36A are disposed on the right and left outer sides (lateral sides) of the upper end of the sleeve.
The front side member 23 is provided with a rear lower arm support portion 51 between the front lower arm support portion 36 and the rear end portion fastened to the lateral extension portion 4D. The rear lower arm support 51 includes: openings 51A formed in the left and right outer side surfaces of the front side member 23; and a support shaft (not shown) provided on the rear side of the opening 51A, extending vertically, and coupled to the upper wall and the lower wall of the front side member 23. A rubber bush (not shown) into which the support shaft is inserted is attached to the rear shaft support portion 31E of the lower arm 31. The rear shaft support portion 31E of the lower arm 31 is displaced with respect to the rear lower arm support portion 51 by deformation of the rubber bush. The lower arm 31 is swingably supported by the front subframe 6 via the front lower arm support portion 36 and the rear lower arm support portion 51.
As shown in fig. 4, the left rear lower arm supporting portion 51 is disposed on an extension line extending a left rear end of the support member 26 in a bottom view (in a top view). In addition, the right rear lower arm supporting portion 51 is disposed on an extension line extending a right rear end portion of the support member 26 in a plan view. The rear lower arm support portion 51 is disposed at a position more inward in the left-right direction than the front lower arm support portion 36. The left and right rear lower arm support portions 51 are disposed on the left and right inner sides of the left and right joint portions 44.
The front lower arm support portion 36 is disposed rearward of the steering gear box 40. The arm front portion 31C may be inclined slightly rearward outward in the left-right direction, or the joint portion 44 at the neutral position O1 may be disposed on an extension line extending the arm front portion 31C in the longitudinal direction.
As shown in fig. 5 and 6, each of the front side frames 23 has a deformation promoting portion 53 having lower rigidity than the other portions of the front side frame 23 at a position on the front side of the joint portion with the front cross member 24. The deformation promoting portion 53 is a concave portion recessed downward from the upper surface of the front side member 23. The deformation promoting portions 53 extend from the left and right inner side surfaces of the front side member 23 to the left and right outer side surfaces. When a collision load is applied to the front side member 23 from the front and rear, the front side member 23 is deformed first at the deformation promoting portion 53, and buckles downward from the deformation promoting portion 53 as a starting point.
A reinforcing plate 54 is joined to the upper surface of each front side member 23 along the upper surface thereof at a position forward of the deformation promoting portion 53. Each reinforcing plate 54 is provided with a front stabilizer support portion 56 that rotatably supports the front stabilizer 55. The front stabilizer 55 is a rod-shaped member having a laterally extending portion extending in the left-right direction and left-right end portions extending rearward from both left and right ends of the laterally extending portion, and the front stabilizer 55 is coupled at the end portions to the lower surfaces of the left and right front dampers 33 via a coupling member. The front stabilizer support portion 56 has a support hole (not shown) through which the lateral extension portion of the stabilizer passes. A rubber bush for supporting the lateral extension of the stabilizer is fitted in the supporting hole. The front stabilizer support portion 56 is fastened to the upper surface of the front side member 23 by a plurality of bolts. The front side member 23 has a higher rigidity at the portion where the reinforcing plate 54 and the front stabilizer support portion 56 are provided than at other portions.
The effects of the above embodiment will be described below. Since the front subframe 6 of the present embodiment is provided with the front lower arm support portion 36 at the portion where the rigidity is improved by the front cross member 24, the front subframe 6 is less likely to deform against the lateral force applied from the lower arm 31 even in the case where the front side member 23 has the deformation promoting portion 53 or the case where the front side member 23 has a curved shape in order to expand the steering space of the front wheel 5. This can improve the ride quality and the traveling performance. Further, the front side frame 23 can be bent to the left and right inner sides, and a space for steering the front wheel 5 can be secured large on the left and right outer sides of the front subframe 6, and the steering angle of the front wheel 5 can be increased.
The front lower arm support portion 36 is provided in a portion that overlaps the front cross member 24 in the left-right direction, and thus the front subframe 6 can be made more resistant to deformation against lateral forces applied from the lower arm 31.
The front lower arm support portion 36 is coupled to the front side member 23 and the front cross member 24, whereby the rigidity of the front lower arm support portion 36 is further improved. This enables the front subframe 6 to reliably support the lower arm 31. Further, in the front side member 23, the difference in rigidity between the deformation promoting portion 53 and the portion behind the deformation promoting portion 53 where the front cross member 24 and the front lower arm supporting portion 36 are provided is increased, and therefore, the front side member 23 can be reliably deformed at the deformation promoting portion 53 at the time of a front collision.
The front lower arm support portion 36 is coupled to the front side frame 4, and therefore, the rigidity of the front lower arm support portion 36 is improved. Further, the lateral force applied from the lower arm 31 to the front lower arm support portion 36 can be transmitted to the front side frame 4. Further, the load can be efficiently transmitted from the front side member 23 and the front cross member 24 to the front side frame 4 through the inclined portion 36D. Since the end of the inclined portion 36D is provided at the portion of the front cross member 24 where rigidity is enhanced by the collar 47, the load can be efficiently transmitted from the front cross member 24 to the front side frame 4. Further, the rigidity of the front cross member 24 can be enhanced by the steering gear box 40.
The support members 26 increase the rigidity of the front sub-frame 6. Likewise, the front stabilizer 55 raises the rigidity of the front sub frame 6. This makes it possible to make the front subframe 6 less likely to deform in response to a lateral force applied from the lower arm 31.
In the event of a frontal collision, the front crush box 12 is first deformed to absorb the load, and therefore, the deformation promoting portion 53 can be suppressed from being deformed when the collision load is small. This can avoid replacement of the front subframe 6.
While the description of the specific embodiments has been completed, the present invention is not limited to the above embodiments, and can be widely modified.
Claims (10)
1. A vehicle body front structure characterized by comprising:
a front subframe mounted to a front portion of the vehicle; and
a pair of left and right lower arms of the suspension that are swingably supported by the front sub frame,
the front subframe has: a pair of left and right longitudinal beams extending in the front-rear direction; a cross member extending in the left-right direction and coupled to the left and right side members; and at least one lower arm support portion provided on at least one of the side members and the cross member, for supporting the lower arm so as to be swingable,
each of the side members has a deformation promoting portion having a rigidity lower than that of the other portion of the side member at a position on the front side of a joint portion with the cross member,
the rear end of the front lower arm support portion disposed on the foremost side of the lower arm support portions is disposed rearward of the front end of the cross member, and the front end of the front lower arm support portion is disposed rearward of the front end of the cross member.
2. The vehicle body front structure according to claim 1,
the front lower arm support portion is combined with the side member and the cross member.
3. The vehicle body front structure according to claim 2,
the front lower arm support portion is coupled to left and right outer side surfaces and an upper surface of the side member and an upper surface of the cross member.
4. The vehicle body front structure according to claim 2 or 3,
the vehicle body front structure has a pair of left and right front side frames extending forward and rearward in front of the vehicle,
the front lower arm support portion extends from the side member and is attached to the front side frame.
5. The vehicle body front structure according to claim 4,
the front lower arm support portion has a connecting portion extending laterally outward and upward from the cross member toward the front side frame.
6. The vehicle body front structure according to claim 5,
the beam is provided with a sleeve which vertically penetrates through the beam and is combined with the upper surface and the lower surface of the beam,
a steering gear box is arranged on the sleeve pipe,
the inner end of the connecting portion in the left-right direction is disposed on the side of the upper end of the sleeve.
7. The vehicle body front structure according to claim 6,
the steering gear box extends left and right and is coupled to the upper surface of the cross member at a plurality of locations in the left-right direction.
8. The vehicle body front structure according to claim 1,
the deformation promoting portion is a recess portion provided on an upper surface of the side member so as to be recessed downward.
9. The vehicle body front structure according to claim 1,
the left and right outer edges of the side members are curved so that the central portions in the front-rear direction are recessed inward in the left and right direction.
10. The vehicle body front structure according to claim 4,
the front side frame has a front mounting portion to which a portion of the side member on the front side of the deformation promoting portion is mounted,
an impact absorbing structure is provided on the front side of the front side frame in front of the front mounting portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-182596 | 2018-09-27 | ||
| JP2018182596A JP6767450B2 (en) | 2018-09-27 | 2018-09-27 | Body front structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110949516A true CN110949516A (en) | 2020-04-03 |
| CN110949516B CN110949516B (en) | 2022-04-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910881383.0A Active CN110949516B (en) | 2018-09-27 | 2019-09-18 | Vehicle body front structure |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6767450B2 (en) |
| CN (1) | CN110949516B (en) |
Cited By (3)
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| CN114620131A (en) * | 2020-12-09 | 2022-06-14 | 本田技研工业株式会社 | Vehicle body structure |
| CN115071825A (en) * | 2021-03-15 | 2022-09-20 | 丰田自动车株式会社 | Vehicle with a steering wheel |
| CN116812007A (en) * | 2023-07-18 | 2023-09-29 | 小米汽车科技有限公司 | Auxiliary frame structure and vehicle |
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| EP3650312B1 (en) * | 2018-11-06 | 2020-12-30 | Autotech Engineering Deutschland GmbH | Axle support with device for positioning of a steering gear |
| KR102359712B1 (en) * | 2020-07-09 | 2022-03-02 | 주식회사 동희산업 | Sub frame for vehicle |
| KR102527970B1 (en) * | 2021-03-03 | 2023-05-04 | 주식회사 에이치에스아쿠아피드 | Manufacturing process of organic farm materials using waste water of marine by-product and natural material |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2020050186A (en) | 2020-04-02 |
| CN110949516B (en) | 2022-04-22 |
| JP6767450B2 (en) | 2020-10-14 |
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