JP2015101226A - Vehicle body frame structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle body frame structure which inhibits an engine from moving forward thereby protecting a crew compartment, etc. during a vehicle rear end collision in a rear engine type or mid engine type vehicle.SOLUTION: A vehicle frame structure 1 includes: a rear cross member 16 which is disposed along a vehicle width direction at the rear side of a vehicle cabin; rear side frames 17 which are disposed along a vehicle fore and aft direction at both sides when viewed in a vehicle width direction and connected with end parts of the rear cross member 16; and reinforcement frames 20, each of which is spanned between the rear cross member 16 and the rear side frame 17.

Description

  The present invention relates to a body frame structure on the rear side of a four-wheel vehicle.

  In vehicles such as automobiles, the rigidity of the spare tire house is increased by bridging a reinforcing member between the cross member and the rear side frame, so that deformation of the spare tire house is suppressed in the event of a vehicle rear collision. There is a thing (refer patent document 1).

JP 2011-245960 A

In a rear engine type or mid engine type vehicle, the engine moves forward at the time of a rearward collision of the vehicle, and deforms the engine room, the passenger compartment, and the like.
The vehicle body frame structure described in Patent Document 1 is premised on a front engine system in which the engine is disposed in the front portion of the vehicle. For this reason, the vehicle body frame structure described in Patent Document 1 cannot be applied to a rear engine type or mid engine type vehicle.
In a rear engine type or mid engine type vehicle, a vehicle body frame structure that suppresses forward movement of an engine (for example, a transmission-equipped engine) and protects other members and a passenger compartment disposed in the engine room is disclosed in Patent Document 1. Is not considered at all.

  Accordingly, the present invention provides a vehicle body frame in which an engine room is arranged at the rear part of the vehicle, and suppresses forward movement of the engine and protects other members and passenger compartments arranged in the engine room at the time of a vehicle rear collision. The purpose is to provide a structure.

The vehicle body frame structure according to the present invention employs the following configuration in order to solve the above problems.
A first embodiment of the present invention is a vehicle body frame structure in which an engine room is arranged at a rear portion of a vehicle, and a rear cross member arranged along a vehicle width direction at the rear of the vehicle compartment, and a rear of the vehicle compartment A pair of rear side frames arranged along the vehicle longitudinal direction on both sides in the vehicle width direction and respectively connected to end portions of the rear cross member, and spanned between the rear cross member and the pair of rear side frames. And a pair of reinforcing frames.

  According to a second embodiment of the present invention, in the first embodiment, the reinforcing frame includes an upper reinforcing member having a groove-shaped cross section that opens downward, and a lower reinforcing member having a groove-shaped cross section that opens upward. The lower end of the upper reinforcing member and the upper end of the lower reinforcing member are overlapped and joined into a tubular cross-sectional shape.

  According to a third embodiment of the present invention, in the first or second embodiment, at least a rear end portion is fixed to the reinforcing frame, and a fuel tank holding the fuel tank disposed below the reinforcing frame is held from below. A member is provided.

  According to a fourth embodiment of the present invention, in any one of the first to third embodiments, the fuel connected from the fuel tank to the fuel supply port in a space surrounded by the rear cross member, the rear side frame, and the reinforcing frame. Piping is inserted, It is characterized by the above-mentioned.

  According to a fifth embodiment of the present invention, in any one of the first to fourth embodiments, the reinforcing frame is in front of the engine disposed in the engine room and faces the engine in the vehicle front-rear direction. A contact member is provided at the position.

  The present invention protects other members (fuel tanks, fuel pipes) and passenger compartments arranged in the engine room by suppressing the forward movement of the engine in a rear engine type or mid engine type vehicle in the event of a vehicle rear collision. Body frame structure can be realized.

1 is a diagram illustrating a schematic configuration of a vehicle body frame 1. FIG. It is the perspective view which looked at the body frame 1 from the rear lower side. 3 is an enlarged cross-sectional view of a reinforcing frame 20. FIG. It is the perspective view which looked at engine room ER from back lower part. 4 is a perspective view showing a fuel tank holding member 30. FIG. It is a figure which shows fuel piping FP. It is a figure which shows arrangement | positioning of the reinforcement frame 20A and the transmission mounting engine EN. It is a figure which shows arrangement | positioning of the reinforcement frame 20B and the transmission mounting engine EN. It is a figure which shows arrangement | positioning of the reinforcement flame | frame 20 and the transmission mounting engine EN. It is a figure which shows the contact member 25. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First embodiment]
FIG. 1 is a diagram showing a schematic configuration of the vehicle body frame 1.
FIG. 2 is a perspective view of the vehicle body frame 1 as viewed from the rear lower side.
FIG. 3 is an enlarged cross-sectional view of the reinforcing frame 20.

The vehicle A is a rear engine type or mid engine type vehicle in which the engine room ER is disposed behind the passenger compartment (vehicle compartment) IR. That is, the engine room ER is formed in the vehicle rear part.
The vehicle A includes a body frame 1.
A body frame (body frame structure) 1 includes a front sub frame 11, a front side frame 12, a front cross member 13, a side sill 14, a middle cross member 15, a rear cross member 16, a rear side frame 17, a rear sub frame 18 and a center member 19. Is the main element.

The front subframe 11 extends in the vehicle width direction at the foremost part of the vehicle A.
The two front side frames 12 respectively extend in the vehicle front-rear direction on both sides in the vehicle width direction. The front end side of each front side frame 12 is connected (welded) to the front subframe 11.
The front cross member 13 extends in the vehicle width direction and is connected (welded) to the rear ends of the two front side frames 12.

The two side sills 14 extend from both ends of the front cross member 13 toward the rear of the vehicle.
The middle cross member 15 extends in the vehicle width direction and is connected (welded) between the centers of the two side sills 14.
The center member 19 extends between the front cross member 13 and the rear cross member 16 in the center of the vehicle.

  The rear cross member 16 is disposed behind the passenger compartment IR. The rear cross member 16 extends in the vehicle width direction and is connected (welded) to the rear ends of the two side sills 14, respectively. An engine room ER is formed behind the rear cross member 16.

The two rear side frames 17 are connected (welded) to the rear cross member 16, respectively. Each rear side frame 17 extends in the vehicle front-rear direction on both sides of the engine room ER in the vehicle width direction.
The rear sub-frame 18 extends in the vehicle width direction at the rearmost portion of the vehicle A. The rear sub frame 18 is connected (welded) to the rear end sides of the two rear side frames 17.

  A reinforcing frame 20 is bridged between the rear cross member 16 and each rear side frame 17. Each reinforcing frame 20 is obliquely connected (welded) to both end sides of the rear cross member 16 and the front end side of the rear side frame 17. Each reinforcing frame 20 is connected (welded) to the upper rear surface of the rear cross member 16 and the inner side surface of the rear side frame 17.

  The reinforcing frame 20A disposed on the left side when the vehicle body frame 1 is viewed from the rear lower side is formed in a substantially linear shape. The reinforcing frame 20B disposed on the right side is formed in a curved shape that swells toward the engine room ER.

  The reinforcement frame 20 is a part that suppresses forward movement of an engine (transmission-mounted engine EN) or the like disposed in the engine room ER when the vehicle A collides backward. When the vehicle A collides backward, the engine or the like starts moving forward, but the forward movement is suppressed by contacting the reinforcing frame 20. Thereby, damage to passenger compartment IR etc. is prevented.

The reinforcing frame 20 includes an upper reinforcing member 21 and a lower reinforcing member 22.
The upper reinforcing member 21 and the lower reinforcing member 22 are each formed in a U shape, a U shape, or a groove shape in a cross section orthogonal to the longitudinal direction. The upper reinforcing member 21 has a groove-shaped cross-sectional shape that opens downward, and the lower reinforcing member 22 has a groove-shaped cross-sectional shape that opens upward.
The reinforcing frame 20 is formed by joining the lower end of the upper reinforcing member 21 and the upper end of the lower reinforcing member 22. Specifically, the upper reinforcing member 21 and the lower reinforcing member 22 are overlapped in the vertical direction. Then, the side surfaces of the upper reinforcing member 21 and the lower reinforcing member 22 are brought into close contact with each other, and the side surfaces are arc-welded (for example, MIG welding). Thereby, the upper reinforcing member 21 and the lower reinforcing member 22 are connected (welded) to form a tubular cross-sectional shape.

The reinforcing frame 20 does not have a flange portion or the like on the outer peripheral surface. Flange portions are provided at the opening edges of the upper reinforcing member 21 and the lower reinforcing member 22, respectively, and a joining method in which the flange portions are overlapped and spot-welded and joined is not employed.
Since there are no protruding flanges or the like on the outer peripheral surface of the reinforcing frame 20, even if a wiring cable or piping (fuel piping FP or the like) is placed around the reinforcing frame 20, the wiring cable or piping is damaged. There is nothing.

FIG. 4 is a perspective view of the engine room ER as viewed from the rear lower side.
FIG. 5 is a perspective view showing the fuel tank holding member 30.
FIG. 6 is a diagram showing the fuel pipe FP.

A fuel tank FT and the like are disposed in the engine room ER formed in the rear lower part of the vehicle A.
The fuel tank FT is formed by multilayering resin. The fuel tank FT is disposed behind the rear cross member 16 and below the reinforcing frame 20. The fuel tank FT extends in the vehicle width direction along the rear cross member 16. Both ends of the fuel tank FT in the vehicle width direction are close to the respective rear side frames 17.

The fuel tank FT is in close contact with the rear surface of the rear cross member 16 and the lower surface of the reinforcing frame 20 (lower reinforcing member 22), and is further held by two fuel tank holding members 30 from below.
The fuel tank holding member 30 is formed by bending a metal pipe. At least the rear end of the fuel tank holding member 30 is fixed to the reinforcing frame 20. Specifically, the fuel tank holding member 30 is bridged between the small rear cross member 16 and the reinforcing frame 20. The fuel tank holding member 30 is connected (bolted) to the center-side lower surface of the rear cross member 16 and the rear-side lower surface (lower reinforcing member 22) of the reinforcing frame 20, respectively.

Two grooves into which the fuel tank holding member 30 is fitted are formed on the lower surface of the fuel tank FT so as to extend in the vehicle front-rear direction.
The fuel tank holding member 30 extends downward from the rear lower surface of the reinforcing frame 20, then bends forward, and extends to the lower surface of the rear cross member 16 along the groove on the lower surface of the fuel tank holding member 30. .

A fuel pipe FP is connected to the fuel tank FT. The fuel pipe FP is a resin pipe and is connected to a fuel supply port FI that opens on the outer surface of the vehicle A.
The fuel pipe FP extends upward from the upper surface of the right end of the fuel tank FT in the vehicle width direction, and is inserted into a space surrounded by the rear cross member 16, the rear side frame 17, and the reinforcing frame 20. The fuel pipe FP is connected to a fuel supply port FI disposed on the outer surface of the vehicle A.
By forming the reinforcing frame 20B into a curved shape that swells toward the engine room ER, the fuel pipe FP can be easily inserted.

FIG. 7 is a diagram showing the arrangement of the reinforcing frame 20A and the transmission-mounted engine EN.
FIG. 8 is a view showing the arrangement of the reinforcing frame 20B and the transmission-mounted engine EN.
FIG. 9 is a diagram showing the arrangement of the reinforcing frame 20 and the transmission-mounted engine EN.
8 and 9, the illustration of the rear side frame 17 to which the reinforcing frame 20B is connected is omitted.

A transmission-mounted engine EN is disposed behind the fuel tank FT. The transmission-mounted engine EN is an engine in which a transmission is assembled, and the transmission is a CVT, for example. The transmission-mounted engine EN is disposed in the engine room ER over almost the entire region in the vehicle height direction and the vehicle width direction.
The transmission-mounted engine EN is disposed in proximity to the two rear side frames 17 and the rear subframe 18. Further, the central portion of the transmission-mounted engine EN in the vehicle height direction is disposed close to the two reinforcing frames 20. Of the transmission-mounted engine EN, the auxiliary unit EN1 is close to the reinforcement frame 20A, and the transmission unit EN2 is close to the reinforcement frame 20B.

The vehicle body frame 1 has the following effects.
When the vehicle A collides backward, the transmission-equipped engine EN disposed in the engine room ER in the vicinity of the rear subframe 18 starts to move forward.
However, the transmission-mounted engine EN abuts on the two reinforcing frames 20 that are arranged close to the front and lower side. The auxiliary unit EN1 of the transmission-equipped engine EN contacts the reinforcing frame 20A, and the transmission unit EN2 contacts the reinforcing frame 20B.
For this reason, the forward movement of the transmission-mounted engine EN is suppressed.

Further, since the forward movement of the transmission-mounted engine EN is suppressed, damage to the fuel tank FT and the fuel pipe FP is prevented.
The fuel tank FT is disposed in front of the transmission-mounted engine EN and in front of and below the two reinforcing frames 20. Since the transmission-mounted engine EN abuts against the two reinforcing frames 20 and the forward movement is suppressed, the fuel tank FT is prevented from being crushed between the transmission-mounted engine EN and the rear cross member 16.
The fuel pipe FP is inserted into a space surrounded by the rear cross member 16, the rear side frame 17, and the reinforcing frame 20. That is, the fuel pipe FP is disposed in front of the reinforcing frame 20. Since the transmission-mounted engine EN abuts against the two reinforcing frames 20 and the forward movement is suppressed, the fuel pipe FP is prevented from being crushed between the transmission-mounted engine EN and the rear cross member 16.

  Further, since the forward movement of the transmission-mounted engine EN is suppressed, the passenger compartment IR is also prevented from being damaged. The transmission-mounted engine EN is brought into contact with the two reinforcing frames 20 and the forward movement is suppressed, so that the transmission-mounted engine EN is prevented from reaching the passenger compartment IR. Further, since damage to the fuel tank FT and the fuel pipe FP is prevented, damage to the passenger compartment IR due to a fire is also prevented.

[Second Embodiment]
FIG. 10 is a diagram illustrating the contact member 25.
Each of the two reinforcing frames 20 may be provided with an abutting member 25 protruding rearward on a side surface facing the engine room ER. The contact member 25 is disposed in front of the transmission-equipped engine EN disposed in the engine room EN and at a position facing the transmission-equipped engine EN in the vehicle front-rear direction.
The contact member 25 is close to the center of the transmission-mounted engine EN in the vehicle height direction. Then, when the vehicle A collides backward and the transmission-mounted engine EN starts to move forward, the contact member 25 comes into contact with the transmission-mounted engine EN, and the transmission-mounted engine EN moves forward. Suppress.
By providing the contact member 25, the transmission-mounted engine EN can be reliably brought into contact with the reinforcing frame 20.
Further, by providing the abutting member 25, the force for moving the transmission-mounted engine EN toward the front is transmitted evenly distributed to the two reinforcing frames 20. For this reason, the one reinforcing frame 20 is prevented from being bent and damaging the fuel tank FT, the fuel pipe FP, and the like.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary.

  The transmission-mounted engine EN is mounted with a transmission and corresponds to the engine of the claims. In addition, the engine which does not mount a transmission is also contained in the engine of a claim.

  DESCRIPTION OF SYMBOLS 1 Body frame (body frame structure) 16 Rear cross member 17 Rear side frame 20 Reinforcement frame 21 Upper reinforcement member 22 Lower reinforcement member 25 Contact member 30 Fuel tank holding member A Vehicle ER Engine room EN Transmission-equipped engine (engine) FT Fuel Tank FP Fuel piping IR Crew compartment (vehicle compartment)

Claims (5)

A vehicle body frame structure in which an engine room is arranged at the rear of the vehicle,
A rear cross member disposed along the vehicle width direction at the rear of the passenger compartment;
A pair of rear side frames arranged along the vehicle front-rear direction on both sides in the vehicle width direction behind the passenger compartment and connected to the end portions of the rear cross member;
A pair of reinforcing frames each spanned between the rear cross member and the pair of rear side frames;
A vehicle body frame structure characterized by comprising: The reinforcing frame is
An upper reinforcing member having a groove-shaped cross section opening downward;
A lower reinforcing member having a groove-shaped cross section that opens upward;
With
The vehicle body frame structure according to claim 1, wherein a lower end of the upper reinforcing member and an upper end of the lower reinforcing member are overlapped and joined to each other in a tubular cross-sectional shape.   3. The vehicle body frame according to claim 1, further comprising a fuel tank holding member that holds at least a rear end portion thereof to the reinforcing frame and holds a fuel tank disposed below the reinforcing frame from below. Construction.   4. The fuel pipe connected to the fuel supply port from the fuel tank is inserted into a space surrounded by the rear cross member, the rear side frame, and the reinforcing frame. 5. Body frame structure described.   The said reinforcement frame is a front of the engine arrange | positioned at the said engine room, Comprising: The position which opposes the said engine in the vehicle front-back direction is provided with a contact member, The any one of Claim 1 to 4 characterized by the above-mentioned. The vehicle body frame structure described in the paragraph.

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