CN109484489B - Vehicle body structure of electric vehicle - Google Patents
Vehicle body structure of electric vehicle Download PDFInfo
- Publication number
- CN109484489B CN109484489B CN201811030278.8A CN201811030278A CN109484489B CN 109484489 B CN109484489 B CN 109484489B CN 201811030278 A CN201811030278 A CN 201811030278A CN 109484489 B CN109484489 B CN 109484489B
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- China
- Prior art keywords
- suspension frame
- vehicle body
- front suspension
- body structure
- concave portion
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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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Classifications
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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
- B62D21/11—Understructures, i.e. chassis frame on which a vehicle body may be mounted with resilient means for suspension, e.g. of wheels or engine; sub-frames for mounting engine or suspensions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/08—Front or rear portions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
- B60K17/06—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/08—Front or rear portions
- B62D25/082—Engine compartments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K2001/001—Arrangement or mounting of electrical propulsion units one motor mounted on a propulsion axle for rotating right and left wheels of this axle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2200/00—Type of vehicle
- B60Y2200/10—Road Vehicles
- B60Y2200/11—Passenger cars; Automobiles
- B60Y2200/112—City movers, small sized city motor vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2306/00—Other features of vehicle sub-units
- B60Y2306/01—Reducing damages in case of crash, e.g. by improving battery protection
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Body Structure For Vehicles (AREA)
- Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
Abstract
The invention provides a vehicle body structure of an electric vehicle, which can reduce the backward movement of a suspension frame and a transmission when an excessive impact load is received from the front of the vehicle body. The body structure of the electric vehicle includes: front suspension frames (5) mounted to the floor side members (4) on the left and right sides; a wheel suspension arm (7) supported by the front suspension frame (5) and from which front wheels on the left and right sides are suspended; a transmission (11) disposed in front of the front suspension frame (5) in the front-rear direction of the vehicle body; and an electric motor (12) disposed on one side of the transmission (11) in the vehicle width direction, a concave portion being formed on the front side of the front suspension frame (5), the rear end portion of the transmission (11) being disposed on the concave portion (5c), a cross member (13) being disposed behind the front suspension frame (5), the cross member (13) being configured into a convex shape protruding rearward, the cross member (13) being disposed on the floor side member (4).
Description
Technical Field
The present invention relates to a vehicle body structure of an electric vehicle capable of reducing backward movement of a suspension frame and a transmission when an excessive impact load is applied from the front of the vehicle body.
Background
Conventionally, a component mounting member to which an inverter, a DC/DC converter, and the like are fixed, and a suspension beam to which a motor unit such as a motor and a gear unit is attached are held in a motor chamber (see patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2011-
Disclosure of Invention
Problems to be solved by the invention
When the vehicle body receives an excessive impact load from the front, the motor, the gear unit, and the like may retreat, and when the space of the motor chamber is limited, the following may occur: the motor, the gear unit, and the like contact the dash panel at the rear, deforming the dash panel. If this deformation progresses, the battery mounted on the lower part of the vehicle body is affected, and this problem cannot be ignored.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a vehicle body structure of an electric vehicle capable of reducing backward movement of a suspension frame and a transmission when an excessive impact load is applied from the front of a vehicle body.
Means for solving the problems
In order to solve the above problems, the present invention is a vehicle body structure of an electric vehicle, including: a front suspension frame mounted on the floor longitudinal beams on the left and right sides; the wheel suspension arm is supported on the front suspension frame and is hung with front wheels at the left side and the right side; a transmission disposed in front of the front suspension frame in a front-rear direction of a vehicle body; and an electric motor disposed on one side of the transmission in a vehicle width direction, a concave portion being formed on a front side of the front suspension frame, a rear end portion of the transmission being disposed on the concave portion, a cross member being disposed behind the front suspension frame, the cross member being configured into a convex shape protruding rearward, the cross member being provided on the floor side member.
ADVANTAGEOUS EFFECTS OF INVENTION
Since the concave portion is formed on the front side of the front suspension frame and the rear end portion of the transmission is disposed on the concave portion, the transmission comes into contact with the concave portion of the front suspension frame when moving rearward of the vehicle body, and the rearward movement of the transmission can be reduced. Here, since the convex cross member configured to project rearward is attached to the floor side member rearward of the front suspension frame, the load can be borne by the cross member, and the rearward movement of the front suspension frame and the rearward movement of the transmission can be reduced.
Drawings
Fig. 1 is a perspective view of a vehicle body structure of an electric vehicle according to an embodiment of the present invention, as viewed from the front after an exterior member is removed.
Fig. 2 is a perspective view of the motor chamber.
Fig. 3 is a bottom view of the front portion of the vehicle as viewed from the lower portion of the vehicle body.
Attached pictureDescription of the invention
1. A motor chamber; 2. a component mounting frame; 3. a vehicle body; 4. a floor stringer; 5. a front suspension frame; 5a, 5b, an arm support; 5c, 5d, a concave portion; 6. a front wheel; 7. a wheel suspension arm; 8. a mounting device; 9. a lower sill portion; 10. a cross brace; 11. a transmission; 12. an electric motor; 13. a cross beam; 13b, a concave portion; 14. a battery mounting part; 15. a battery mounting part; 16. the interior of the carriage; 17. a dash panel; 18. a floor; 19. a front longitudinal beam.
Detailed Description
Fig. 1 is a view showing a motor chamber in a front portion of a vehicle with exterior members of an electric vehicle driven by a front wheel removed, and as shown in fig. 2, a component mounting bracket 2 for mounting a control unit such as an inverter or a converter is provided in the motor chamber 1. The component mounting frame 2 includes: a beam 21 extending in the vehicle width direction; a beam 22 having a substantially trapezoidal shape in a plan view and provided to extend rearward of the beam 21; and a beam 23 extending in the vehicle body longitudinal direction so as to pass through the vehicle width direction center of the beam 21, the beam 23 being connected to the front surface 22a of the beam 22.
The component mounting frame 2 is attached such that both end portions of the beam 21 are connected to a pair of front side frames 19 disposed along the front-rear direction of the vehicle body 3 on both left and right sides of the vehicle body 3. A front suspension frame 5 is disposed in the vehicle width direction on the lower side of the component mounting frame 2, and the front suspension frame 5 is provided with an arm support portion 5a and an arm support portion 5b formed by two forks that are divided into an obliquely forward side and an obliquely rearward side on both left and right sides. The front suspension frame 5 is attached to a pair of floor frames 4 connected to the rear portions of the front side frames 19, and a wheel suspension arm 7 for suspending the front wheel 6 is attached to the arm support portion 5a and the arm support portion 5b of the front suspension frame 5 so as to be capable of swinging. A mounting device 8 including a spring and a damper, not shown, is mounted between the wheel suspension arm 7 and the vehicle body. The vehicle body is supported by the mounting device 8 and a mounting device not shown mounted on the rear wheel side.
The pair of floor side members 4 are provided along the front-rear direction of the vehicle body on both left and right sides of the vehicle body, and are configured such that the interval therebetween gradually decreases toward the front in a region below the floor panel 18 and from a substantially middle position of the floor panel 18 to a front side portion of the floor panel 18. The front end portion of the floor side member 4 supports the arm support portion 5b positioned on the rear side of the front suspension frame 5, and a reinforcement cross brace 10 is connected to the front end portion side of the floor side member 4, and the cross brace 10 is stretched between the front end portion of the floor side member 4 and a side sill portion 9 provided in the front-rear direction of the vehicle body on both left and right sides of the floor.
The front suspension frame 5 has a concave portion 5c that is formed by arm support portions 5a extending diagonally forward on both left and right sides, and a rear end portion of the transmission 11 that is long in the front-rear direction is disposed in the concave portion 5 c. On one side in the vehicle width direction of the transmission 11 disposed in the concave portion 5c, an electric motor 12 is disposed along the vehicle width direction, and the electric motor 12 is disposed in front of the concave portion 5 c. The front suspension frame 5 has a recessed portion 5d extending obliquely rearward on both left and right sides, and a cross member 13 is provided behind the recessed portion 5d, and the cross member 13 connects the floor frames 4 with each other at a narrow interval in the left-right direction. The cross member 13 is formed in a convex shape that projects in a substantially trapezoidal shape toward the vehicle body rear, and a concave portion 13b is formed at the vehicle body front side of the convex portion 13 a. The concave portion 13b of the cross member 13 and the concave portion 5d of the front suspension frame 5 face each other and together constitute a frame structure S.
A battery mounting member 14 is provided at the vehicle body rear side of the cross member 13, the battery mounting member 14 is provided between the floor side members 4, and a front end portion 15a of a battery mounting portion 15 for mounting a battery is mounted to the battery mounting member 14. The rear portion of the battery mounting portion 15 is supported by a plurality of battery mounting members, not shown, provided between the floor frames 4 in a region on the vehicle body rear side.
Returning to fig. 2, a dash panel 17 that partitions the motor chamber 1 and the cabin interior 16 is disposed behind the component mounting frame 2.
The following describes an operation of the vehicle body structure of the electric vehicle when receiving an excessive impact load from the front.
The transmission 11 is disposed in the motor chamber 1 of the vehicle body in the front-rear direction, and when the transmission 11 moves rearward of the vehicle body due to an excessive impact load from the front, the transmission comes into contact with the concave portion 5c provided on the front side of the front suspension frame 5 in a front-view. In this way, the transmission 11 is locked to a position of the concave portion 5c of the front suspension frame 5, and the rearward movement of the transmission 11 is prevented. At this time, the load is borne by the cross member 13 attached between the floor side members 4, thereby reducing the backward movement of the front suspension frame 5 and the backward movement of the transmission 11. The cross member 13 is provided so as to cross a central passage, not shown, and can also contribute to maintaining the shape of the central passage. Further, since the battery mounting member 14 is provided behind the cross member 13, the impact load from the front can be received by the front portion of the floor side member 4 to which the front suspension frame 5 is coupled, and the load from the front can be transmitted and dispersed further rearward. Here, since the floor side members 4 are configured to approach each other toward the front side, the following is considered: the floor frames 4 are both inclined inward, and thus no load is transmitted rearward of the vehicle body. By supporting the floor side member 4 with the battery mounting member 14, the falling of the floor side member 4 can be reduced.
When a load from the front of the vehicle body is applied to the tires of the front wheels 6, the load is transmitted to the front suspension frame 5 via the wheel suspension arms 7, and further, to the mounting points of the front suspension frame 5 with respect to the floor side members 4. When the deformation of the vehicle body progresses, the front wheel 6 comes into contact with the rocker portion 9, and therefore the load can be dispersed to the rocker portion 9. Among the loads, a part of the load transmitted to the floor side member 4 and the front suspension frame 5 is dispersed to the rocker 9 via the reinforcing wale 10.
In the above embodiment, when the transmission 11 is moved rearward by an impact load from the front of the vehicle body, the transmission 11 comes into contact with the concave portion 5c provided on the front side of the front suspension frame 5. In this way, the transmission 11 is locked to the concave portion 5c of the front suspension frame 5, and the rearward movement of the transmission 11 is reduced, so that damage to the dash panel 17 caused by the rearward movement of the transmission 11 and the front suspension frame 5 can be prevented.
Here, since the cross member 13 having a convex shape projecting rearward is attached to the floor side member 4 rearward of the front suspension frame 5, the load can be borne by the cross member 13, and the rearward movement of the front suspension frame 5 and the rearward movement of the transmission can be reduced.
A concave portion 5d similar to the concave portion 5c is formed on the rear side of the front suspension frame 5, and a concave portion 13b is formed on the front side of the cross member 13 in the vehicle body so as to face the concave portion 5 d.
Since the mounting point of the front suspension frame and the mounting point of the cross member 13 are provided adjacent to each other, the frame structure S can be formed by the concave portion 13b and the concave portion 5d, and the rigidity can be improved.
A reinforcing cross brace 10 is provided between the front end portion of the left floor side member 4 of the left and right floor side members 4 and the left side sill portion 9, and a reinforcing cross brace 10 is provided between the front end portion of the right floor side member 4 of the left and right floor side members 4 and the right side sill portion 9, so that some of the loads transmitted to the floor side members 4 and the front suspension frame 5 can be dispersed to the side sill portion 9 via the reinforcing cross brace 10.
Industrial applicability
The present invention is not limited to the above-described embodiment, and for example, a mechanism may be provided that can cancel only the mounting of the front suspension frame 5 on the side where the transmission 11 is provided, when receiving a load, and can distribute the load on that side (the vehicle left side in the embodiment) so as to be transmitted from the wheel suspension arm 7 to the rocker 9. Since the cross member 13 is connected to the front portion of the floor side member 4, the load can be transmitted from the floor side member 4 to the cross member 13, and therefore, the load applied to the dash panel 17 by the motor 12 and the transmission 11 can be reduced. In addition, it is needless to say that the present invention can be appropriately modified and implemented without changing the technical scope of the present invention.
Claims (5)
1. A vehicle body structure of an electric vehicle,
the body structure of the electric vehicle includes: a front suspension frame having a concave portion formed on a front side thereof, the front suspension frame being attached to floor side members on both left and right sides; the wheel suspension arm is supported on the front suspension frame and is hung with front wheels on the left side and the right side; a transmission disposed in front of the front suspension frame in a front-rear direction of a vehicle body, a rear end portion of the transmission being disposed in the concave portion; and a motor arranged on one side of the transmission along a vehicle width direction,
the body structure of the electric vehicle includes: a cross member provided behind the front suspension frame, the cross member connecting the left and right floor frames to each other and forming a convex shape protruding rearward; a battery mounting member provided behind the cross member and mounting a battery mounting portion for mounting a battery,
the left and right floor frames are configured such that the front sides thereof are close to each other,
the battery mounting member is provided between the floor side members on the left and right sides.
2. The vehicle body structure of an electric vehicle according to claim 1,
the body structure of the electric vehicle includes: a lower rail section provided on both left and right sides of the floor along the front-rear direction of the vehicle body; and the reinforcing cross brace is arranged between the lower side beam part and the front end part of the floor longitudinal beam in an opening mode.
3. The vehicle body structure of an electric vehicle according to claim 1 or 2,
a concave portion is formed at a rear side of the front suspension frame, and a mounting point of the front suspension frame and a mounting point of the cross member are disposed adjacent to each other.
4. The vehicle body structure of an electric vehicle according to claim 1 or 2,
a concave portion is formed on the rear side of the front suspension frame, and the concave portion on the front side of the cross member and the concave portion provided on the rear side of the front suspension frame face each other to constitute a frame structure.
5. The vehicle body structure of an electric vehicle according to claim 3,
and reinforcing cross braces are respectively arranged between each front end part and each lower side beam part of the floor longitudinal beams on the left side and the right side.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017174099A JP6951681B2 (en) | 2017-09-11 | 2017-09-11 | Body structure of electric vehicle |
JP2017-174099 | 2017-09-11 |
Publications (2)
Publication Number | Publication Date |
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CN109484489A CN109484489A (en) | 2019-03-19 |
CN109484489B true CN109484489B (en) | 2022-04-05 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CN201811030278.8A Active CN109484489B (en) | 2017-09-11 | 2018-09-05 | Vehicle body structure of electric vehicle |
Country Status (4)
Country | Link |
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JP (1) | JP6951681B2 (en) |
CN (1) | CN109484489B (en) |
DE (1) | DE102018113205B4 (en) |
FR (1) | FR3070960A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7432136B2 (en) * | 2019-09-17 | 2024-02-16 | スズキ株式会社 | Electric vehicle power unit mounting structure |
JP7435425B2 (en) * | 2020-12-08 | 2024-02-21 | トヨタ自動車株式会社 | vehicle |
DE102021101730A1 (en) * | 2021-01-27 | 2022-07-28 | Bayerische Motoren Werke Aktiengesellschaft | Structural element for a chassis of a motor vehicle |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102161351A (en) * | 2010-02-15 | 2011-08-24 | 马自达汽车株式会社 | Lower structure of automotive vehicle |
WO2013054564A1 (en) * | 2011-10-11 | 2013-04-18 | スズキ株式会社 | Structure for lower vehicle body of vehicle front part |
CN103129617A (en) * | 2011-11-29 | 2013-06-05 | 铃木株式会社 | Surrounding structure for suspension frame of vehicle |
CN103465763A (en) * | 2013-08-19 | 2013-12-25 | 北京汽车新能源汽车有限公司 | A0-grade pure electric car power battery arrangement scheme |
CN104015803A (en) * | 2013-03-01 | 2014-09-03 | 铃木株式会社 | Suspension frame construction |
EP3208180A1 (en) * | 2016-02-18 | 2017-08-23 | C.R.F. Società Consortile per Azioni | Auxiliary frame for supporting a front suspension of a motor-vehicle |
Family Cites Families (6)
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JP2959915B2 (en) * | 1992-03-04 | 1999-10-06 | トヨタ自動車株式会社 | Electric car |
JP3003485B2 (en) * | 1993-12-07 | 2000-01-31 | 日産自動車株式会社 | Motor unit support structure for electric vehicles |
JP5212086B2 (en) * | 2008-12-24 | 2013-06-19 | 三菱自動車工業株式会社 | Battery case for electric vehicles |
JP5062228B2 (en) | 2009-07-17 | 2012-10-31 | 日産自動車株式会社 | Electric vehicle motor unit mounting method |
WO2011055695A1 (en) * | 2009-11-05 | 2011-05-12 | 本田技研工業株式会社 | Vehicle body structure |
US9499205B1 (en) * | 2015-09-23 | 2016-11-22 | Ford Global Technologies, Llc | Hybrid vehicle packaging system |
-
2017
- 2017-09-11 JP JP2017174099A patent/JP6951681B2/en active Active
-
2018
- 2018-06-04 DE DE102018113205.0A patent/DE102018113205B4/en active Active
- 2018-09-05 CN CN201811030278.8A patent/CN109484489B/en active Active
- 2018-09-07 FR FR1858035A patent/FR3070960A1/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102161351A (en) * | 2010-02-15 | 2011-08-24 | 马自达汽车株式会社 | Lower structure of automotive vehicle |
WO2013054564A1 (en) * | 2011-10-11 | 2013-04-18 | スズキ株式会社 | Structure for lower vehicle body of vehicle front part |
CN103129617A (en) * | 2011-11-29 | 2013-06-05 | 铃木株式会社 | Surrounding structure for suspension frame of vehicle |
CN104015803A (en) * | 2013-03-01 | 2014-09-03 | 铃木株式会社 | Suspension frame construction |
CN103465763A (en) * | 2013-08-19 | 2013-12-25 | 北京汽车新能源汽车有限公司 | A0-grade pure electric car power battery arrangement scheme |
EP3208180A1 (en) * | 2016-02-18 | 2017-08-23 | C.R.F. Società Consortile per Azioni | Auxiliary frame for supporting a front suspension of a motor-vehicle |
Also Published As
Publication number | Publication date |
---|---|
JP6951681B2 (en) | 2021-10-20 |
DE102018113205B4 (en) | 2024-03-21 |
DE102018113205A1 (en) | 2019-03-14 |
FR3070960A1 (en) | 2019-03-15 |
JP2019048566A (en) | 2019-03-28 |
CN109484489A (en) | 2019-03-19 |
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