CN109803878B

CN109803878B - Load transmission system for vehicle

Info

Publication number: CN109803878B
Application number: CN201780061615.7A
Authority: CN
Inventors: 长门贤
Original assignee: Isuzu Motors Ltd
Current assignee: Isuzu Motors Ltd
Priority date: 2016-10-07
Filing date: 2017-10-06
Publication date: 2022-02-25
Anticipated expiration: 2037-10-06
Also published as: WO2018066684A1; JP2018058525A; PH12019500704A1; CN109803878A; JP6915255B2

Abstract

In a load transmission system (1) of a vehicle, which is configured in such a manner that a cab (10) independent of a vehicle body frame (20) is placed in front of the vehicle body frame (20) extending in the front-rear direction of the vehicle, a strength member (30) is arranged along the floor surface (14) of the cab (10) and on the central inner side of the rear from a joint (21) between the cab (10) and the side of the vehicle body frame (20).

Description

Load transmission system for vehicle

Technical Field

The present disclosure relates to a load transfer system of a vehicle.

Background

In a vehicle having a frame structure in which a cab is mounted on a body frame, when the vehicle collides in the front, an impact force is applied to both ends in the front of the vehicle, and the impact force is transmitted to a floor surface of the cab diagonally rearward from front joint portions of the body frame and both sides of the cab toward the center side. However, in the conventional floor surface structure of the cab, the vertical reinforcing member (vertical frame) is disposed in the front-rear direction of the floor surface, and there is a risk that the floor surface of the passenger compartment of the cab is deformed by the impact force.

In this regard, a vehicle body front structure has been proposed in which a longitudinal frame, which is a reinforcing member for a front side frame, is provided in a vehicle body frame in the vicinity of a pair of left and right front side frames provided in parallel to a vehicle body, and the longitudinal frame is inclined with respect to the front side frames in a plan view such that the rear portion thereof is positioned further inward in the vehicle width direction than the front portion thereof (see, for example, patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2009-73243

Disclosure of Invention

Problems to be solved by the invention

Further, since the vehicle body front portion structure is a structure of a vehicle body frame located forward of the mounting position of the cab, it is not concerned with deformation of the floor surface of the cab during a front collision of the vehicle.

An object of the present disclosure is to provide a load transmission system for a vehicle, which can suppress deformation of a floor surface of a passenger compartment in a front collision of the vehicle, in the vehicle having a structure in which a cab and a vehicle body frame are formed separately.

Means for solving the problems

The load transmission system of a vehicle of the present disclosure for achieving the above object includes: a vehicle body frame extending in a front-rear direction of the vehicle; a cab that is placed in front of the vehicle body frame and is independent of the vehicle body frame; and a strength member that is disposed along a floor surface of the cab toward a center inner side of a rear of the vehicle from a joint portion of the cab and a side of the vehicle body frame.

Further, a cross-member, which is a reinforcement for supporting the weight of the cab, may be disposed to extend in the width direction of the floor surface, including a connecting portion with the vehicle body frame at both front ends of the floor surface of the passenger compartment of the cab, and the strength member may be disposed so as to connect the connecting portion and the cross-member.

Further, a housing portion of a power transmission device may be disposed below a center of the floor surface in a width direction so as to extend in a front-rear direction of the floor surface, the floor surface located above the housing portion may be configured to be convex upward with respect to the floor surface at a periphery thereof, and the lateral strength member may be disposed across the housing portion, and the strength member may be disposed: and connecting the connecting part with an intersecting part, wherein the intersecting part is a part where the accommodating part and the transverse strength member intersect.

Further, a 2 nd strength member extending in the front-rear direction of the vehicle may be disposed so as to be connected to a vehicle rear end portion of the strength member along a floor surface of the cab.

Effects of the invention

In a vehicle having a body frame and a cab separately, when a frontal collision occurs, an impact force at the time of the collision is applied to a floor surface of the cab from a joining portion of the body frame and the side of the cab toward a central inner side via the body frame, and the floor surface of the cab is buckled and deformed.

According to the load transmission system for a vehicle of the present disclosure, since the strength member is disposed along the floor surface of the cab inside the center rearward from the joining portion on the side, deformation of the floor surface of the cab can be suppressed.

Brief description of the drawings

Fig. 1 is a side view showing a relationship between a cab and a vehicle body frame.

Fig. 2 is a view showing embodiment 1 of the present disclosure, in which the relationship between the cab and the vehicle body frame in fig. 1 is viewed from the bottom surface of the vehicle body.

Fig. 3 is a view obtained by removing the vehicle body frame from fig. 2.

Fig. 4 is a view showing embodiment 2 of the present disclosure with a vehicle body frame removed.

Detailed Description

Hereinafter, a load transmission system for a vehicle according to embodiment 1 of the present disclosure will be described with reference to the drawings. In fig. 1 to 3, the front-rear direction of the vehicle, the width direction of the vehicle, and the vertical direction of the vehicle are indicated by arrows X, Y, Z, respectively. In fig. 1, only the front portion of the vehicle is illustrated, and the loading floor disposed behind the cab 10 and the portion of the vehicle body frame 20 supporting the loading floor are omitted. In fig. 2, the vehicle body frame 20 projects forward from the engine compartment 11, but a bumper (not shown) is disposed at the projecting portion.

As shown in fig. 1, a load transmission system 1 of a vehicle according to the present disclosure is a system applied to a vehicle, for example, a vehicle such as a small commercial vehicle (LCV) or a truck, and is configured to: a cab 10 independent of the vehicle body frame 20 is mounted on a front side portion of the vehicle body frame 20 extending in the front-rear direction (X direction) of the vehicle. In this vehicle, when the vehicle collides with another vehicle or an obstacle in front, an impact force at the time of the collision is applied to the strength members on both sides of the vehicle body frame 20 from the front of the vehicle.

The cab 10 is configured to: the vehicle includes an engine compartment 11, a dash panel 12, and a passenger compartment 13 in this order from the front of the vehicle. The engine compartment 11 is a portion for housing an engine (internal combustion engine; not shown) as a power source for vehicle travel. The dash panel 12 is a part that divides the engine compartment 11 and the passenger compartment 13. As shown in fig. 2, in a floor surface (floor panel) 14 of the passenger compartment 13, a height (right-angled portion) of a portion directly below which a power transmission device is disposed is higher than heights of other portions in order to dispose the power transmission device related to power transmission of the vehicle, such as a transmission or a propeller shaft (not shown), below the power transmission device. In other words, the power transmission device is disposed in a convex storage section (tunnel) 15 where the floor panel 14 protrudes from the floor panel 14 of the other flat plate portion.

As shown in fig. 2, the cab 10 is connected to a vehicle body frame 20 at cab brackets (front joint portions) 21 provided at both front ends of the floor panel 14. In fig. 2, only the cab bracket 21 is shown and the other cab brackets are omitted with respect to the connecting position between the cab 10 and the vehicle body frame 20. The positions of connection between the engine compartment 11 and the dash panel 12 and the vehicle body frame 20 are also omitted.

In the present disclosure, as shown in fig. 2 and 3, the following structure is provided: a strength member (underfloor reinforcement) 30 is disposed along a floor panel (floor surface) 14 of the cab 10, at a central inner side of the rear from a joint portion 21 at the side of the cab 10 and the vehicle body frame 20. Namely, the structure is as follows: when an impact force F is applied to the front of the vehicle, a strength member 30 is disposed in a direction perpendicular to the arcuate buckling line (wrinkle) B in a portion B (only shown in fig. 3 and omitted in fig. 2 for the sake of avoiding complexity) of the floor panel 14 that buckles due to the application of the impact force (load) F.

When an impact force F is applied to the front of the vehicle, the impact force F is transmitted to the cab bracket 21 via the vehicle body frame 20. Since the impact force F transmitted to the cab bracket 21 is blocked only by the floor panel 14 of the passenger compartment 13 without the strength member 30, the arcuate buckling portion B centered on the cab bracket 21 is formed on the floor panel 14.

Even when 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 extends rearward from the front of the vehicle as in the conventional case, the strength member is deviated from the transmission direction of the impact force F, so that the floor panel 14 is formed with the buckling portion B.

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 borne by the strength member 30, and an efficient load transmission path can be obtained. Therefore, buckling of the floor panel 14 can be suppressed.

The strength member 30 is a steel material shaped like "コ" that is joined to the floor panel 14 on the vehicle body frame 20 side 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.

In addition, in the present disclosure, the configuration may be such that: a cross strength member (reinforcement) 14c is disposed so as to extend in the width direction of the floor panel 14, and a strength member 30 is disposed so as to connect the cab legs 21 and the cross strength member 14 c. The lateral strength member 14c is a reinforcing member in the vehicle width direction for supporting the weight of the cab 10, and is not particularly limited as long as the shape and material thereof have rigidity that is less likely to deform.

With this configuration, most of the impact force F can be blocked by the cab legs 21 and the strength members 30 and the cross strength members 14c behind them. As a result, buckling of the floor panel 14 can be suppressed.

In fig. 2 and 3, the floor panel 14 is defined as a front floor 14b at the front side of the cross strength member 14c and as a rear floor 14d at the rear side. A region between the dash panel 12 and the front floor 14b is denoted by 14a, and a region between the passenger compartment 13 and the rear cargo floor is denoted by 14 e.

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

In the present disclosure, as shown in fig. 2 and 3, a storage section 15 of the power transmission device is disposed below the center of the floor panel 14 in the width direction so as to extend in the front-rear direction of the floor panel 14, the floor panel 14 located above the storage section 15 is configured to protrude upward with respect to the floor panels 14 on the periphery thereof, and a cross-strength member 14c is disposed across the storage section 15. The strength member 30 is disposed so as to connect the cab legs 21 and the intersection 22, and the intersection 22 is a portion where the receiving portion 15 and the cross strength member 14c intersect.

With this configuration, the impact force F transmitted via the cab bracket 21 can be received by the strength member 30 and the rear cross strength member 14c while ensuring the position of the power transmission device such as a transmission coupled to the engine.

Next, a load transmission system for a vehicle according to embodiment 2 of the present disclosure will be described with reference to the drawings. As shown in fig. 4, embodiment 2 of the present disclosure is similar to embodiment 1 in that a strength member 30 is disposed along the floor panel 14 of the cab 10 from a joining portion (cab bracket) 21 on the side of the cab 10 and the vehicle body frame 20 toward the center inside of the rear, but differs in that a 2 nd strength member (2 nd underfloor reinforcement column) 31 extending in the front-rear direction of the vehicle is disposed along the floor panel 14 of the cab 10 so as to be connected to a vehicle rear end portion of the strength member 30.

With this configuration, a new load transmission path formed by the 2 nd strength member 31 is further connected to the load transmission path formed by the cab legs 21 and the strength members 30, and an efficient load transmission path having further improved rigidity as a whole is formed, so that the force for suppressing buckling of the floor panel 14 due to the impact force F can be further increased.

In fig. 4, the 2 nd 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, but the present invention is not limited to this configuration as long as an efficient load transmission path at the time of a frontal collision of the vehicle can be obtained.

According to the load transmission system 1 of the vehicle of the present disclosure, since the strength member 30 is disposed along the floor panel (floor surface) 14 of the cab 10 from the lateral joint portion 21 toward the rear center inner side, in the vehicle in which the vehicle body frame 20 and the cab 10 are configured separately, at the time of a frontal collision, the impact force F at the time of the collision is applied to the floor panel 14 of the cab 10 from the lateral joint portion 21 of the vehicle body frame 20 and the cab 10 toward the center inner side via the vehicle body frame 20, and buckling and deformation of the floor panel 14 of the cab 10 can be suppressed.

The present application is based on Japanese patent application 2016 (Japanese application 2016-.

Industrial applicability

According to the load transmission system for a vehicle of the present disclosure, since the strength member is disposed along the floor surface of the cab inside the center rearward from the joining portion on the side, it is useful in that deformation of the floor surface of the cab can be suppressed.

Description of the reference numerals

1 load transmission system of vehicle

10 driver's cabin

11 engine compartment

12 front coaming

13 passenger compartment

14 floor panel (floor surface)

14a area between the dash panel and the front panel

14b front floor

14c Cross Strength Member

14d rear floor

14e area between cab and loading counter

15 housing part of power transmission device

20 vehicle body frame

21 cab support (front connecting part)

22 cross strength member and receiving portion intersection

30 strength member

31 nd 2 nd strength member

B floor board buckling part

F impact force

Claims

1. A load transfer system of a vehicle, comprising: a vehicle body frame extending in a front-rear direction of the vehicle; a cab that is placed in front of the vehicle body frame and is independent of the vehicle body frame; and a strength member disposed along a floor surface of the cab toward an inner side of a center of a rear of the vehicle from a joint portion of the cab and a side of the vehicle body frame,

a cross member that includes a connecting portion connected to the vehicle body frame and is disposed at both front ends of a floor surface of a passenger compartment of the cab so as to extend in a width direction of the floor surface, the cross member being a reinforcement for supporting a weight of the cab;

the strength member is configured to: connecting the connecting part with the cross strength member,

a storage section of a power transmission device is disposed below a center of the floor surface in a width direction so as to extend in a front-rear direction of the floor surface, the floor surface located above the storage section is configured to protrude upward with respect to the floor surface at a periphery thereof, and the cross-member is disposed across the storage section;

the strength member is disposed to connect the connection portion and an intersection portion where the receiving portion and the cross strength member intersect.

2. The load transmission system according to claim 1, wherein a 2 nd strength member extending in a front-rear direction of the vehicle is disposed along a floor surface of the cab so as to be connected to a vehicle rear end portion of the strength member.