JP4204362B2 - Cab deformation prevention structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cab deformation prevention structure for ensuring the safety of passengers in a cab (hereinafter referred to as a cab) when a cab-over-type commercial vehicle collides. In particular, the present invention relates to a cab deformation preventing structure that facilitates maintaining a passenger's living space by a cab frame structure extending in the front-rear direction on the cab floor.
[0002]
[Prior art]
In a cab-over type commercial vehicle, because the cab is in the forefront, it is necessary to secure a living space for passenger safety if a collision occurs and the cab is deformed.
[0003]
FIG. 1 shows an example of a cab portion of a cab over type track. A cab 1 is mounted on the front end portion of the chassis frame F, and two cab frames 2 extending in the front-rear direction are provided below the floor surface of the cab 1. A hinge portion (not shown) is provided at the front portion of the cab frame 2 and is supported by the chassis frame F. Between the chassis frame F and the cab frame 2 is a tilting means constituted by a hydraulic cylinder / piston. 5 is interposed, and the cab 1 is tilted up by rotating around the hinge portion by its operation.
[0004]
As shown in FIG. 1, the cab frame 2 is bent at the rear half as shown in FIG. 1 to form a kicked-up shape to support the cab floor. Further, as shown in FIG. 2, the two cab frames 2 and 2 are inflected from a narrow parallel space at the front part and become parallel at a wide distance at the rear part. ing.
[0005]
In the cab 1 configured as described above, when a frontal collision is made with the wall surface W, the cab 1 is pushed between the wall W and the advanced carrier end B1 as shown by a chain line in FIG. It will be crushed. Then, the cab frame 2 is buckled and deformed as indicated by a broken line E in the figure, and the living space of the driver D is reduced.
[0006]
As a conventional technique for dealing with such a problem, a member attached to the cab frame and a member attached to the engine are engaged with each other, and the cab frame is supported by the rigidity of the engine to deform the cab. A technique of stopping is proposed (see Patent Document 1).
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 6-115463
[Findings]
As a result of further various studies conducted by the present inventors to deal with the above problems, the cross-sectional shape of the cab frame 2 is an inverted hat shape as shown in FIG. When the cab 1 has a shape extending in a flange shape horizontally outward from the end, the deformation of the cab 1 due to a frontal collision is caused by the fact that the inverted hat-shaped cross section has two parallel vertical side surfaces 2 s at the inflection point of the cab frame 2. As shown in FIG. 4, it was found that 2s bent inward and buckled, and the cab frame 2 was bent in the longitudinal direction starting from that. Then, it was found that the buckling strength of the cab frame 2 is increased by reinforcing the cross-sectional shape so as to prevent the side surfaces 2s, 2s from bending inward.
[0009]
Therefore, by applying this technology, the strength distribution of the cab frame 2 is optimized so that the space other than the occupant's occupant space becomes a crushed space. It was.
[0010]
[Problems to be solved by the invention]
The present invention has been proposed on the basis of the above findings in order to address the above problems, and provides a cab deformation prevention structure for a cab-over vehicle that prevents deformation so as to easily maintain the occupant's living space in the event of a collision. It is an object.
[0011]
[Means for Solving the Problems]
According to the present invention, a cab of a cab-over type commercial vehicle having a cab frame (2) having a reverse hat-like cross-sectional shape opened upward on the floor of the cab (1) and extending in the front-rear direction is provided. In the prevention structure, the frame deformation preventing reinforcement (3D) is provided at the inflection point (A) in the side surface shape of the cab frame (2) and / or the inflection point (B) in the planar shape, which becomes a buckling deformation starting point in the event of a collision. The frame deformation preventing reinforcing material (3D) is a steel sheet molded product fitted between both side surfaces (2s, 2s) of the cab frame, and the cross-sectional shape of the reinforcing material (3f) is one side of the frame flange portion (2f). (3a-3b) extending horizontally along the lower side of the inner surface of the frame side surface (2s) and extending horizontally between the side surfaces (2s, 2s) of the frame (3c). superposed along the inner surface above the s) (3d), the upper end terminates at the inner surface without extending to the frame flange (2f), and both side surfaces (2s, 2s) superimposed frame sides on both sides with respect to portions of Kyaburemu ( The bent portions (3e) of the portions 3b, 3d) and the horizontally extending portion (3c) are each formed in a stepped shape (3f), and are fixed to the cab frame (2) to prevent deformation thereof. It has a function.
[0012]
Further, according to the present invention, the frame deformation preventing reinforcing material (3D) is provided in the vicinity of the location (C) where the cab frame (2) and the tilting means (5) are connected.
[0013]
By providing the frame deformation prevention reinforcement near the starting point of the buckle deformation of the cab frame or the connecting part of the tilt means in this way, the buckle deformation strength of the cab frame at the time of collision increases. By strengthening the vicinity of the seat compared to the end, it is easy to maintain the occupant's living space even if the cab is deformed, and safety is increased.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
In the present embodiment, the cab frame 2 has the side shape and the planar shape described with reference to FIGS. 1 and 2 and is formed by forming a steel plate. The basic cross-sectional shape is an inverted hat shape as shown in FIG. 3, that is, a U-shape having an upper opening at both side surfaces 2s, 2s and a bottom surface 2b that are substantially vertically parallel (which may have a draft angle). None, from the opening end portion, the flange surfaces 2f, 2f extend in both horizontal directions.
[0018]
Moreover, it is the location ("A" in FIG. 1) that is inflected in the side surface shape that is the position that becomes the starting point of buckling deformation of the cab frame 2, and the location that is also inflected in the planar shape (FIG. 2 "B") is provided with a reinforcing material 3D.
[0021]
And this embodiment is the reinforcing material 3D by the steel plate molded product inserted between the both-sides 2s and 2s of the cab frame 2, as shown in FIG.5 and FIG.6. As shown in the cross section of FIG. 6, the cross-sectional shape is such that one side is overlapped from the frame flange portion (2f) along the lower side of the inner surface of the frame side surface (2s) (3a-3b), and both side surfaces (2s, 2s) ) Horizontally extending (3c), and further overlapping (3d) above the inner surface of the opposite frame side surface (2s), the upper end of which does not extend to the frame flange portion (2f) and ends at the inner surface, and the carblem Folded portions (3e) of the frame side surface overlapping portions (3b, 3d) on both sides and the horizontally extending portion (3c) with respect to both side surfaces (2s, 2s) of each are formed in a stepped shape (3f). It has the function of being fixed to the cab frame (2) and preventing its deformation.
[0022]
Thus, a closed cross section is formed by the combination of the cab frame 2 and the reinforcing material 3D, which are open cross sections, and the torsional strength can be increased. Accordingly, it is possible to eliminate the problem that the coupling (for example, spot welding) with the floor surface (not shown) is separated by the torsional bending load.
[0023]
The starting points A and B of the buckle deformation of the cab frame 2 are in the vicinity of the connecting portion of the tilting means 5, but when the connecting portion C of the tilting means is separated from the buckling starting point, the tilting means By providing this reinforcing member 3D in the vicinity of the connecting portion C of 5, it is possible to cope with local stress concentration due to the load associated with the attachment of the tilt means 5 or the tilt operation.
[0024]
【The invention's effect】
According to the present invention, the following operational effects can be obtained.
(1) When the reinforcing member according to the present invention is provided on the cab frame, even if the open cross section is easy to manufacture, the both side surfaces are connected to prevent buckling inward, and the strength is obtained without forming a closed cross section. Can be secured.
(2) In particular, if the strength of the cab frame at the driver's seat is increased and the parts other than the occupant occupant are deformed, it is easy to maintain the occupant's living space in the event of a collision.
(3) Moreover, damage to the joint portion between the cab frame and the floor surface can be prevented.
[Brief description of the drawings]
FIG. 1 is a side view showing a cab and a cab frame.
FIG. 2 is a diagram showing a planar shape of the cab frame of FIG. 1;
FIG. 3 is a view showing a cross-sectional shape of the cab frame of FIG. 1;
4 is a view showing a buckled state of a cross section of the cab frame shown in FIG. 3;
FIG. 5 is a perspective view showing an embodiment of a cab frame reinforcing material according to the present invention.
6 is a cross-sectional view in the direction perpendicular to the frame in FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cab 2 ... Cab frame 3D ... Reinforcement material 5 ... Tilt means

Claims (2)

In a cab deformation prevention structure for a cab-over type commercial vehicle having a cab frame (2) having a reverse hat-like cross-sectional shape opened upward on the floor of the cab (1) and extending in the front-rear direction, A frame deformation preventing reinforcing material (3D) is provided at the inflection point (A) in the side surface shape of the cab frame (2) and / or the inflection point (B) in the planar shape as the buckling deformation starting point, The frame deformation preventing reinforcing material (3D) is a steel plate molded product inserted between both side surfaces (2s, 2s) of the cab frame, and the cross-sectional shape of one side is from the frame flange portion (2f) to the frame side surface (2s). (3a to 3b) and extends horizontally between the frame side surfaces (2s, 2s) (3c), and further above the inner surface of the opposite frame side surface (2s) Superimposed along (3d), the upper end terminates at the inner surface without extending to the frame flange (2f), and both side surfaces (2s, 2s) of Kyaburemu either side of the frame side overlapping portions with respect to (3b, 3d) and horizontal each bent portion of the portion (3c) extending in a direction (3e) is formed in a stepped shape (3f) each have a function of preventing the deformation is fixed to the cab frame (2) A cab deformation prevention structure characterized by that.   The cab deformation preventing structure according to claim 1, wherein the frame deformation preventing reinforcing material (3D) is provided in the vicinity of a location (C) where the cab frame (2) and the tilting means (5) are connected. .

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