WO2018066684A1

WO2018066684A1 - Load transmission system for vehicle

Info

Publication number: WO2018066684A1
Application number: PCT/JP2017/036415
Authority: WO
Inventors: 賢長門
Original assignee: いすゞ自動車株式会社
Priority date: 2016-10-07
Filing date: 2017-10-06
Publication date: 2018-04-12
Also published as: PH12019500704A1; JP6915255B2; JP2018058525A; CN109803878B; CN109803878A

Abstract

A load transmission system 1 for a vehicle that comprises a vehicle body frame 20 extending in the longitudinal direction of the vehicle and a cab 10 separate from and to the front of the vehicle body frame 20, the load transmission system 1 being such that strength members 30 are disposed along the floor surface 14 of the cab 10 so as to be oriented from lateral connections 21 between the cab 10 and the vehicle body frame 20 toward the rear central inner side.

Description

Vehicle load transmission system

This disclosure relates to a vehicle load transmission system.

In a vehicle having a frame structure in which a body frame and a cab such as a light commercial vehicle (LCV) and a truck are configured separately and the cab is mounted on the body frame, when the vehicle collides forward, The impact force at the time of collision is applied toward both front ends of the vehicle, and is transmitted to the floor of the cab obliquely rearward from the front joints on both sides of the body frame and the cab toward the center. However, in the conventional cab floor structure, vertical reinforcing members (vertical frames) are arranged in the front-rear direction of the floor surface, and the floor surface of the cabin of the cab may be deformed by this impact force.

Here, in the body frame, a vertical frame as a reinforcing material for the front side frame is provided in the vicinity of the pair of left and right front side frames provided in parallel to the vehicle body, and the vertical frame is formed into a front side frame in plan view. A vehicle body front structure has been proposed in which the vehicle body is inclined with respect to the rear part so that the rear part thereof is located on the inner side in the vehicle width direction than the front part thereof (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2009-73243

By the way, the vehicle body front part structure described above is a structure related to the vehicle body frame ahead of the cab mounting position, and therefore is not involved in the deformation of the cab floor during a vehicle frontal collision.

An object of the present disclosure is to provide a vehicle load transmission system capable of suppressing deformation of a floor surface of a passenger room at the time of a vehicle front collision in a vehicle having a structure in which a cab and a body frame are formed separately.

In order to achieve the above object, a vehicle load transmission system according to the present disclosure includes a vehicle body frame extending in the front-rear direction of the vehicle, a cab that is placed in front of the vehicle body frame, and is separate from the vehicle body frame. And a strength member disposed along a floor surface of the cab from a joint portion on a side of the cab and the vehicle body frame toward a central inner side at the rear of the vehicle.

Further, at both front ends of the floor surface of the cabin of the cab, a connecting portion with the body frame is provided, and a lateral strength member that is a reinforcing material for supporting the weight of the cab is extended in the width direction of the floor surface. The strength member may be disposed by connecting the connecting portion and the lateral strength member.

In addition, a storage portion of the power transmission device is disposed below the center of the floor surface in the width direction so as to extend in the front-rear direction of the floor surface, and the floor surface located above the storage portion is disposed around it. The lateral strength member is disposed so as to straddle the storage portion, and the strength member includes the connection portion, and the intersection of the storage portion and the lateral strength member. It may be arranged by connecting a crossing part which is a part to be performed.

Further, a second strength member extending in the front-rear direction of the vehicle may be disposed along the floor surface of the cab so as to be connected to the vehicle rear end portion of the strength member.

In a vehicle in which the body frame and the cab are separately formed, when a collision occurs in the front, the impact force at the time of the collision is passed through the body frame from the side joint of the body frame and the cab toward the center inside. Joining the floor, the floor of the cab buckles and deforms.

According to the vehicle load transmission system of the present disclosure, the strength member is disposed along the floor surface of the cab from the side joint portion toward the rear center inner side, so that deformation of the floor surface of the cab is suppressed. be able to.

FIG. 1 is a side view showing the relationship between the cab and the body frame. FIG. 2 is a diagram of the relationship between the cab and the vehicle body frame of FIG. 1 as viewed from the bottom surface of the vehicle body, and is a diagram illustrating the first embodiment of the present disclosure. FIG. 3 is a view in which the vehicle body frame is removed from FIG. FIG. 4 is a diagram illustrating a second embodiment of the present disclosure excluding a vehicle body frame.

Hereinafter, the vehicle load transmission system according to the first embodiment of the present disclosure will be described with reference to the drawings. 1 to 3, the longitudinal direction of the vehicle, the width direction of the vehicle, and the vertical direction of the vehicle are indicated by arrows X, Y, and Z, respectively. Further, in FIG. 1, only the front portion of the vehicle is illustrated, and the loading platform disposed behind the cab 10 and the body frame 20 that supports the loading platform are omitted. In FIG. 2, the vehicle body frame 20 protrudes forward from the engine room 11, and a bumper (not shown) is disposed in the protruding portion.

As shown in FIG. 1, a vehicle load transmission system 1 that is an object of the present disclosure is a separate body from the vehicle body frame 20 at a front portion of a vehicle body frame 20 that extends in the front-rear direction (X direction) of the vehicle. The system is applied to a vehicle configured by mounting the cab 10, for example, a vehicle such as a light commercial vehicle (LCV) or a truck. In this vehicle, when the vehicle collides forward with another vehicle, an obstacle, or the like, the impact force at the time of the collision is applied to the strength members on both sides of the body frame 20 from the front of the vehicle.

The cab 10 includes an engine room 11, a dash panel 12, and a cabin 13 in order from the front of the vehicle. The engine room 11 is a part that houses an engine (an internal combustion engine, not shown) that is a power source for driving the vehicle. The dash panel 12 is a part that partitions the engine room 11 and the cabin 13. On the floor surface (floor panel) 14 of the passenger cabin 13, as shown in FIG. 2, a power transmission device related to power transmission of the vehicle, such as a transmission and a propeller shaft (not shown), is disposed below the floor surface. The height (right hatched portion) of the portion where the power transmission device is disposed immediately below is made higher than the height of the other portions. In other words, the power transmission device is disposed in a convex storage portion (tunnel) 15 in which the floor panel 14 rises from the floor panel 14 of the other flat plate portion.

As shown in FIG. 2, the cab 10 is connected to the vehicle body frame 20 by cab mounts (front joints) 21 provided at both front ends of the floor panel 14. In FIG. 2, only the cab mount 21 is illustrated for the connection position of the cab 10 and the vehicle body frame 20, but the other cab mounts are omitted. Further, the connection positions of the engine room 11 and the dash panel 12 and the vehicle body frame 20 are also omitted.

In the present disclosure, as shown in FIGS. 2 and 3, the strength of the cab 10 from the side joints 21 of the cab 10 and the vehicle body frame 20 toward the center of the rear is increased along the floor panel (floor surface) 14 of the cab 10. A member (underfloor reinforcement) 30 is provided and configured. That is, when an impact force F is applied in front of the vehicle, a portion B that is buckled by the impact force (load) F applied on the floor panel 14 (shown only in FIG. 3 and omitted in FIG. 2 to avoid complexity). On the other hand, the strength member 30 is arranged in a direction perpendicular to the arcuate buckling line (wrinkle) B.

When an impact force F is applied in front of the vehicle, the impact force F is transmitted to the cab mount 21 via the body frame 20. When the strength member 30 is not provided, the impact force F transmitted to the cab mount 21 is received only by the floor panel 14 of the passenger cabin 13, so that the arc-shaped buckling portion B centering on the cab mount 21 is the floor panel. 14 is formed.

Further, even if the strength member 30 is provided, if the strength member 30 is provided in parallel with the front-rear direction of the vehicle body from the center in the width direction of the vehicle as it goes from the front to the rear of the vehicle as in the prior art, the impact Since it deviates from the transmission direction of the force F, the buckling portion B is formed on the floor panel 14.

In contrast, in the present disclosure, since the strength member 30 is disposed so as to be orthogonal to the buckling portion B, the impact force F can be sufficiently handled by the strength member 30, and an efficient load transmission path. Can be obtained. Therefore, it is possible to suppress the floor panel 14 from buckling.

The strength member 30 is a “U” -shaped steel material connected to the body frame 20 side of the floor panel 14 by spot welding or the like. However, the shape and material are not particularly limited as long as they have rigidity that does not easily deform.

Further, according to the present disclosure, the lateral strength member (reinforce) 14c extends in the width direction of the floor panel 14, and the strength member 30 is disposed by connecting the cab mount 21 and the lateral strength member 14c. You may comprise. The lateral strength member 14c is a reinforcing member in the vehicle body width direction for supporting the weight of the cab 10, and the shape and material thereof are not particularly limited as long as they have rigidity that does not easily deform.

With this configuration, most of the impact force F can be received by the cab mount 21 and the strength member 30 and the lateral strength member 14c behind the cab mount 21. As a result, it is possible to suppress the floor panel 14 from buckling.

In FIG. 2 and FIG. 3, regarding the floor panel 14, the floor panel ahead of the lateral strength member 14c is the front floor 14b, and the rear front panel is the rear floor 14d. A section between the dash panel 12 and the front floor 14b is 14a, and a section between the passenger cabin 13 and the rear loading platform is 14e.

The lateral strength member 14c is a member connected to the floor panel 14 from the body frame 20 side. One end in the X direction of the lateral strength member 14c is joined by spot welding or the like from below to a portion where the rear floor 14d is overlapped and joined above the rear end of the front floor 14b. The other end in the X direction of the lateral strength member 14c is joined to the front floor 14b at a position ahead of the one end by spot welding or the like from below.

Further, in the present disclosure, as shown in FIGS. 2 and 3, the storage portion 15 of the power transmission device extends in the front-rear direction of the floor panel 14 and is disposed below the center in the width direction of the floor panel 14. The floor panel 14 positioned above the storage unit 15 is configured to rise upward with respect to the surrounding floor panel 14, and the lateral strength member 14 c is disposed so as to straddle the storage unit 15. Then, the strength member 30 is disposed by connecting the cab mount 21 and the intersecting portion 22 which is a portion where the storage portion 15 and the lateral strength member 14c intersect.

With this configuration, the impact force F transmitted via the cab mount 21 is applied to the strength member 30 and the rear side while securing the position where a power transmission device such as a transmission connected to the engine is disposed. It can be received by the strength member 14c.

Next, a vehicle load transmission system according to a second embodiment of the present disclosure will be described with reference to the drawings. As shown in FIG. 4, the second embodiment of the present disclosure is similar to the first embodiment, along the floor panel 14 of the cab 10, a joint portion (cab mount) on the side of the cab 10 and the vehicle body frame 20. The strength member 30 is the same in that the strength member 30 is disposed toward the center of the rear side of the vehicle 21, but the second strength member (second underfloor reinforcement) 31 extending in the front-rear direction of the vehicle is connected to the floor of the cab 10. It differs in that it is arranged along the panel 14 so as to be connected to the vehicle rear end of the strength member 30.

By configuring in this way, a new load transmission path formed by the second strength member 31 is further connected to the load transmission path formed by the cab mount 21 and the strength member 30, and the overall rigidity is thereby increased. Furthermore, since the improved efficient load transmission path is formed, the suppression force against the occurrence of buckling of the floor panel 14 due to the impact force F can be further improved.

In FIG. 4, the second strength member 31 disposed on the rear floor 14d is connected to the strength member 30 disposed on the front floor 14b via the lateral strength member 14c. The present invention is not limited to this configuration as long as an efficient load transmission path can be obtained.

According to the vehicle load transmission system 1 of the present disclosure, the strength member 30 is disposed along the floor panel (floor surface) 14 of the cab 10 from the side joint portion 21 toward the rear center inside. In a vehicle in which the frame 20 and the cab 10 are formed separately, when the vehicle collides forward, the impact force F at the time of the collision is centered from the joint 21 on the side of the body frame 20 and the cab 10 via the body frame 20. Although it adds to the floor panel 14 of the cab 10 toward the inside, it can suppress that the floor panel 14 of the cab 10 buckles and deform | transforms.

This application is based on a Japanese patent application (Japanese Patent Application No. 2016-198639) filed on October 7, 2016, the contents of which are incorporated herein by reference.

According to the vehicle load transmission system of the present disclosure, the strength member is disposed along the floor surface of the cab from the side joint portion toward the rear center inner side, so that deformation of the floor surface of the cab is suppressed. It is useful in that it can.

DESCRIPTION OF SYMBOLS 1 Vehicle load transmission system 10 Cab 11 Engine room 12 Dash panel 13 Guest room 14 Floor panel (floor surface)
14a Partition 14b between the dash panel and the front floor 14b Front floor 14c Lateral strength member 14d Rear floor 14e Partition 15 between the cab and loading platform 15 Power transmission device storage 20 Body frame 21 Cab mount (front connection)
22 Crossing portion 30 between lateral strength member and storage portion Strength member 31 Second strength member B Buckling portion F of floor panel Impact force

Claims

A vehicle body frame extending in the front-rear direction of the vehicle, mounted on the front of the vehicle body frame, a cab separate from the vehicle body frame, and along the floor surface of the cab, on the side of the cab and the vehicle body frame A vehicle load transmission system comprising a strength member disposed toward the inner center of the rear side of the vehicle from one of the joints.
At both front ends of the floor surface of the cabin of the cab, a connecting portion with the body frame is provided, and a lateral strength member that is a reinforcing material for supporting the weight of the cab extends in the width direction of the floor surface. Arranged,
The vehicle load transmission system according to claim 1, wherein the strength member is disposed by connecting the connection portion and the lateral strength member.
A storage portion of the power transmission device is disposed below the center of the floor surface in the width direction so as to extend in the front-rear direction of the floor surface, and the floor surface located above the storage portion is disposed around the floor. It is configured to swell upward with respect to the floor surface, and the lateral strength member is disposed across the storage portion,
3. The vehicle load transmission system according to claim 2, wherein the strength member is disposed by connecting the connection portion and an intersection portion where the storage portion and the lateral strength member intersect.
The second strength member extending in the front-rear direction of the vehicle is connected to the vehicle rear end portion of the strength member along the floor surface of the cab. The vehicle load transmission system described in 1.