JPH09175443A - Lower structure for cab of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a survival space by controlling deformation at the time of the collision energy absorption. SOLUTION: A rear mount rail 100 supporting a back end part of an under frame arranged in the lower part of a cab of a vehicle is equipped with a first member 110 and a second member 120, and the two members are integrally formed using welding. The rear mount rail with a closed cross-section and high rigidity can be obtained by forming the two members integrally. Moreover, a reinforcement member 130 is installed in the rear mount rail. A projection part 122 is formed in the undersurface of the second member 120 of the rear mount rail. A under frame rear member 5 fixed to the back end part of the under frame 6 is contacted with the projection part 122, and a rear mount hook 10 is fixed by inserting the rear mount hook 10 into a slit 123 of the projection part 122. The under frame 6 and the rear mount rail 100 are fixed firmly in this configuration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lower structure including a rear mount rail arranged on a lower surface of a cab of a vehicle.

[0002]

2. Description of the Related Art FIG. 11 is a perspective view showing a lower structure including a rear mount rail portion of a cab 30, FIG. 12 is a side view, FIG. 13 is a view taken in the direction of arrow H in FIG. 11, and FIG. Sectional drawing, FIG. 15 is a BB sectional view, FIG. 16 is a CC sectional view, and FIG. 17 is an exploded perspective view. The cab 30 has a seat 32 mounted on the floor panel 3 to form a passenger compartment 34. The front portion of the underframe 6 is fixed to the front mount rail 20, and the rear portion of the underframe 6 is fixed to the rear mount rail 1 via the rear underframe rear 5 and the rear mount bracket 8.

As shown in FIGS. 13, 14 and 15, the floor panel 3 is supported by the rear mount rail 1, the rear mount rail 1 has an open cross section, and appropriate reinforcing members (reinforce) 2, 2a. Are mounted between the rear mount brackets 8 so as to withstand input from the inside of the cab. One end of the rear mount rail is connected to the cab back panel 4. The rear mount 50 is fixed in the rear mount bracket 8 and other members are attached.

FIG. 19 shows a horizontal structure of the underframe, the front mount rail and the rear mount rail. The underframe 6, the front mount rail 20 and the rear mount rail 1 are assembled in a barbed shape. Both ends of both mount rails are connected to the side panel 9.

[0005]

When an impact force F from the front is input to the cab 1, the front horizontal portion of the underframe 6 of the cab buckles in a bellows shape and contracts to cause an impact force F. It is desirable to absorb. As a result, the front horizontal portion contracts, so that the occupant survival space above the rising portion K and the rear horizontal portion M can be secured. Providing a shock absorbing member that buckles like a bellows in the front portion of the vehicle body is disclosed, for example, in Japanese Utility Model Laid-Open No. 1232361/1993.

However, in the energy collision structure of the cab shown in FIG. 19, when the collision energy F is input to the front mount rail 20, this energy is transmitted to the side panel 9 side and the under frame 6 causes the rear mount rail 1 to move. It is transmitted to the side panel 9 side through the structure so that the entire cab absorbs the impact force.

Therefore, when the impact force is transmitted from the underframe 6 toward the rear mount rail 1, the reinforcing member 2 is only arranged between the rear mount brackets 8, and as shown in FIG. In addition, the reinforcing member is not provided in the portion a between the rear mount bracket 8 and the side panel 9, stress concentrates on that portion, and the rear mount rail 1d is easily deformed. When the rear mount rail 1d is deformed, it becomes difficult for the collision energy to be transmitted to the side panel 9 side, and the absorption of the collision energy as a whole cab is hindered. The present invention provides a cab lower structure that solves the above-mentioned problems.

[0008]

As a basic structure, the cab lower structure of the present invention is arranged so as to extend in the front-rear direction at both lower end portions of the floor panel of the cab of the vehicle, and at both front and rear end portions thereof. An underframe formed by fixing a front mount rail and a rear mount rail extending in the lateral direction, wherein the underframe comprises a front horizontal portion forming a horizontal portion of a front portion and a front horizontal portion that is continuous with the front horizontal portion. The rear mount rail has a rising portion that rises above the cab and a rear horizontal portion that forms a rear horizontal portion that is continuous with the rising portion, and the rear mount rail is formed of two divided members that form a closed cross section. It is a thing. With this configuration, the collision energy input to the front part of the cab is transmitted to and absorbed in the entire lower structure.

[0009]

1 is an exploded perspective view of a rear mount rail structure provided in a lower structure of a cab of the present invention, FIG. 2 is an assembled perspective view, FIG. 3 is a sectional view taken along line DD of FIG. 4 is a sectional view taken along line EE of FIG. 1, and FIG. 5 is a sectional view taken along line FF of FIG.

The rear mount rail 100 of the present invention has a first open cross-section member 110 and a second open cross-section member 120, and the two members are integrated by welding. By integrally forming the two members, a rear mount rail having a closed cross section and high rigidity can be obtained. Then, in the rear mount rail, a reinforcing member 13 having a step portion along the length of the rear mount rail is provided.
0 is allocated.

Second open section member 1 of the rear mount rail
A protrusion 122 is formed on the lower surface of 20. The underframe rear member 5 fixed to the rear end of the underframe 6 is brought into contact with the protruding portion 122, and the rear mount hook 10 is inserted into the slit 123 of the protruding portion 122 to fix the rear mount hook 10. With this configuration, the underframe 6 and the rear mount rail 10 which are orthogonal to each other
0 is firmly fixed.

The rear mount rail 100 manufactured by combining two members by welding has a flange portion 11
2, 114 are formed. This flange portion 112, 11
4, the back panel 4 and the floor panel 3 can be firmly attached to the rear mount rail.

FIG. 6 is a rear mount rail 100 of the present invention.
FIG. 7 is a side view of a main part of a vehicle equipped with a vehicle, and FIG. When the underframe 6 is divided into a front half portion 6A, a rising portion 6B, and a rear half portion 6C, the seat 32 on which the occupant P sits is attached to the upper portion of the rising portion 6B. Therefore, the rising portion 6B
The inner and outer surfaces of the vehicle are reinforced by reinforcing materials, and the front half 6A contracts in a bellows manner to absorb impact force and secure a living space for the occupant P.

When the collision energy F is applied to the front mount rail 20 from the front, the relatively weak front half 6A of the underframe 6 is deformed because the rising portion 6B of the underframe 6 has a high strength, and the energy of one side is reduced. Absorb part. The remaining energy transmitted from the underframe 6 to the rear mount rail 100 has high rigidity in the structure near the joint between the underframe 6 and the rear mount rail 100, so that the portion G of the rear mount rail 100 shown in FIG. Energy is transmitted to the side panel 9 side without causing damage. In response to this, the side panel 9 and the rear mount rail 100 can be integrally moved at the time of collision without being deformed.

By this action, by using the rear mount rail as the shock absorbing member as described above, the acceleration received by the occupant P at the time of a collision can be alleviated and the occupant P can be protected.

FIG. 8 is a sectional view of a rear mount rail showing another embodiment of the present invention. 2 rear mount rails
The two members 110 and 120 are joined together to form a closed cross-section structure. The reinforcing member 140 disposed inside has the cross-sectional shape shown in the drawing. Therefore, the rear mount rail portion can be used more effectively as the collision energy absorbing portion.

FIG. 9 is a sectional view of a rear mount rail showing still another embodiment of the present invention. The rear mount rail is formed into a closed cross-section structure by welding the two members 110 and 120 together by welding. The reinforcing member 150 arranged inside has the cross-sectional shape shown in the drawing. Therefore, the rear mount rail portion can be used more effectively as the collision energy absorbing portion.

FIG. 10 is a perspective view showing an example of a reinforcing member 200 arranged inside the underframe rear member 5. The reinforcing member 200 shown in (a) of the drawing has a sectional shape corresponding to the sectional shape of the underframe rear member 5,
The side surface is made into a bellows shape to make it a part that absorbs energy,
It is made by pressing a steel plate. The reinforcing member 210 shown in (b) in the figure is a cylinder made of FRP resin,
Using the light and high-strength function of, a reinforcing member (energy absorption site) is formed. Therefore, it is possible to use the collision energy as the absorbing portion even in the rear portion of the underframe to enhance the energy absorbing ability.
When this cylindrical reinforcing member 210 is used, a working hole is provided in the relevant portion of the rear mount rail 120 and assembled.

[0019]

According to the present invention, since the rear mount rail is composed of the two divided members forming the closed cross section, the rear mount rail has high rigidity against bending. Therefore, even if bending stress is applied to the rear mount rail via the underframe, the rear mount rail does not bend and transmits the impact force to the side panel, so that the impact force is exerted on the entire lower structure of the vehicle cab. Absorb. As a result, the shock absorbing portion that is provided in the front portion of the underframe and that buckles in a staggered manner in the axial direction also performs a predetermined operation and can effectively absorb the shock force. Further, the strength of the connection between the rear mount rail and the side panel is improved, and the rigidity of the corner connecting portion of the cab is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a structure of an underframe portion of the present invention.

FIG. 2 is an assembly perspective view of an underframe portion of the present invention.

FIG. 3 is a sectional view taken along the line DD in FIG. 1;

FIG. 4 is a sectional view taken along line EE of FIG.

5 is a sectional view taken along line FF of FIG.

FIG. 6 is a side view of a main part of a vehicle including the rear mount rail of the present invention.

FIG. 7 is a plan view.

FIG. 8 is a sectional view showing another embodiment of the present invention.

FIG. 9 is a sectional view showing another embodiment of the present invention.

FIG. 10 is a perspective view of a reinforcing member.

FIG. 11 is a perspective view showing a structure of an underframe of the vehicle.

FIG. 12 is a side view showing the structure of the underframe of the vehicle.

FIG. 13 is a view on arrow H of FIG.

14 is a cross-sectional view taken along the line AA of FIG.

15 is a sectional view taken along line BB of FIG.

16 is a cross-sectional view taken along line CC of FIG.

FIG. 17 is an exploded perspective view of the underframe.

FIG. 18 is a plan view showing a modification of the rear mount rail.

FIG. 19 is a plan view schematically showing an underframe.

[Explanation of symbols]

1 Cab 3 Floor Panel 4 Front Mount Rail 5 Rear Mount Rail 100 Cab Underframe 110 First Frame Member 115 First Reinforcing Member 120, 130 Second Frame Member 140 Second Reinforcing Member 160 First Frame Member and Joint of the second frame member

Claims (2)

[Claims] 1. An underframe comprising front and rear mount rails, which are arranged at both lower end portions of a floor panel of a cab of a vehicle so as to extend in the front-rear direction and laterally extend at both front and rear ends thereof. The underframe includes a front horizontal portion that constitutes a front horizontal portion, a rising portion that continuously rises to the upper side of the cab continuously from the front horizontal portion, and a rear horizontal portion that continuously follows the rising portion. A rear cab has a rear horizontal portion that constitutes a part, and a rear mount rail is a lower structure of a cab of a vehicle that is configured by two divided members that form a closed cross section. 2. An underframe comprising front and rear mount rails, which are arranged at both lower ends of a floor panel of a cab of a vehicle so as to extend in the front-rear direction, and laterally extend at front and rear ends thereof. The underframe includes a front horizontal portion that constitutes a front horizontal portion, a rising portion that continuously rises to the upper side of the cab continuously from the front horizontal portion, and a rear horizontal portion that continuously follows the rising portion. The rear mount rail has a rear horizontal portion that constitutes a portion, and the rear mount rail is a member that is divided into two parts that form a closed cross section, and a reinforcing member that is inserted into the member that is divided into two parts and that both ends reach the side panels. Undercar cab structure comprising.