Land vehicles: bodies and tops – Bodies – Structural detail
Reexamination Certificate
2001-05-30
2003-03-25
Pape, Joseph D. (Department: 3612)
Land vehicles: bodies and tops
Bodies
Structural detail
C296S190050, C296S190050, C296S029000, C180S089140, C180S089180
Reexamination Certificate
active
06536837
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a joint structure of a cab mounting portion for joining a cab of a forward control vehicle to a chassis frame.
2. Description of the Related Art
As a cab structure of a forward control vehicle, one shown in
FIG. 13
is generally adopted. A cab
504
is surrounded by front pillars
509
provided on both right and left sides of a front portion, a front mounting rail
506
provided on an outer surface of the front lower portion, a roof panel
511
, a rear panel
512
, a side panel
513
and others, and a floor panel
507
is provided on a floor face. Further, cab-under-frames
508
are fixed to the outer surface of the floor panel
507
. The cab of the forward control vehicle is coupled to a cab mount bracket which is rotatably provided on a chassis frame in a cab mounting portion.
FIGS. 14 and 15
show an example of the structure of a joint portion for the cab and the chassis frame in the prior art. A cab mount bracket
501
b has a shape allowing contact with a lower surface or a side surface of the cab-under-frame
508
and a rotation center hole
514
for tilt of the cab
504
is formed thereto. Further, as shown in the drawings, the cab-under-frame
508
is fixed to an outer surface of the floor panel
507
, and a front end portion of the cab-under-frame
508
is coupled to the front mounting rail
506
side.
In the above-described structure of the joint portion for the cab and the chassis frame, the cab
504
is supported by fastening the cab-under-frame
508
to the cab mount bracket
501
b
fixed to the chassis frame, and it is configured so as to sufficiently resist vertical external force applied from a road surface side during normal running. However, when a vehicle clashed head-on or bumped from behind, an impact load larger than that obtained during normal running acts in the longitudinal direction. Thus, in the structure of the conventional joint portion for the cab and the chassis frame, since the cab-under-frame
508
and the cab mount bracket
501
b
are fastened mainly in the vertical direction there is a possibility that the structure can not sufficiently resist the impact load in the longitudinal direction.
On the other hand, as an example of a well-known technique concerning the periphery of the cab mounting member, there are Japanese Utility Model Applications Laid-open Nos. 116277/1981 and 171653/1986. “The floor structure of a tilt cab” in Japanese Utility Model Application Laid-open No. 116277/1981 is a floor constituent member of a tilt cab, in which a front end of a main sill is flange-coupled to a convex shoulder surface of a front cross member constituting the convex shoulder surface on a rear surface side, and a front end of a cab hinge bracket fixed to the main sill is fixed to the convex shoulder surface. In the case of this well-known technique, the rigidity of the coupling portion is insufficient and the coupling rigidity of the cab hinge bracket relative to the main sill is insufficient because the cab hinge bracket is coupled to the convex shoulder surface on the rear surface of the front cross member having the front-open-section. Therefore, the strength against the external force in the longitudinal direction may be possibly insufficient. On the other hand, in “the cab structure of an automobile” disclosed in Japanese Utility Model Application Laid-open No. 171653/1986, a grill bracket is attached to a front surface of a floor frame which supports a outer surface of a floor panel and to which a cab mounting bracket is fixed, and the grill bracket is fixed to the front grill so that the front grill can function as a strength member. However, this structure cannot sufficiently resist the impact load in the longitudinal direction.
SUMMARY OF THE INVENTION
In view of the above-described problems, it is an object of the present invention to provide a cab structure that a joint portion for a cab and a chassis frame has the sufficient shear strength and which can disperse external force across the cab or the chassis frame to reduce the burden of load and which can sufficiently resist an impact load in the longitudinal direction.
To achieve this aim, there is provided a cab mounting portion structure in which a “inside surface portion of a front mounting rail” provided on a cab front lower side is coupled to a “front end portion upwardly extending a cab-under-frame” fixed to a floor outer surface, a cab mount bracket is also extended upwardly to be coupled to a vehicle front outer portion of the coupling portion, and these three members are integrally fixed to improve the joint strength.
REFERENCES:
patent: 6260912 (2001-07-01), Sarmiento et al.
patent: 6260914 (2001-07-01), Nieminski et al.
patent: 6315351 (2001-11-01), Sarmiento et al.
patent: 56-116277 (1981-09-01), None
patent: 61-171653 (1986-10-01), None
Ishida Youichi
Takagi Masakatsu
Engle Patricia L.
Isuzu Motors Limited
Pape Joseph D.
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