JP3560145B2 - Front structure of tilt cab car - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle body front structure of a tilt type cab vehicle.
[0002]
[Prior art]
Conventionally, a tilt-type cab vehicle is provided with a pair of chassis frames extending in the traveling direction thereof, and cab mount brackets are provided at front ends of the pair of chassis frames, respectively. The cab mount bracket has a first pivot hole for pivotally supporting the front end of the cab. On the other hand, the cab includes a pair of cab floor frames provided on the bottom surface of the floor panel in the traveling direction of the vehicle body, and a cab front cross member bridged at the front end of the pair of cab floor frames. A tilt hinge bracket is provided at the front end of each of the pair of cab floor frames, and the tilt hinge bracket has a second pivot hole that shares a hole with the first pivot hole of the cab mount bracket. Is done. By inserting connecting pins into the first and second pivot holes and pivoting the tilt hinge bracket to the cab mount bracket, the tilt hinge bracket pivots the front end of the cab to the pair of chassis frames described above. It supports.
[0003]
On the other hand, the pair of cab floor frames and the cab front cross member are formed of different members, respectively, and the cab front cross member is erected by welding or screwing to the front ends of the pair of cab floor frames. Since the cab front cross member is located at the front of the vehicle body, it is necessary to secure rigidity at the front of the vehicle body in preparation for an impact from the front of the vehicle, and its joining strength is required to be relatively high. As means for increasing the joining strength, it is conceivable to separately provide a reinforcing member made of another member in a joining step between the cab front cross member and the pair of cab floor frames in a separate step.
[0004]
[Problems to be solved by the invention]
However, providing a reinforcing member made of a separate member at the joint between the cab front cross member and the pair of cab floor frames requires a new member, which complicates the structure at that portion and increases the number of components to be managed. There is a problem that the unit price of the vehicle is pushed up. Further, when the reinforcing member is provided in a separate process, there is a problem that the number of work steps is increased and the unit price is further increased. In order to solve this problem, it is conceivable to increase the thickness of the cab front cross member and the pair of cab floor frames without using a reinforcing member to improve their strength. However, improving the strength by increasing the plate thickness leads to excessive quality and increases the weight of the vehicle.
An object of the present invention is to provide a vehicle body front structure of a tilt-type cab vehicle capable of improving rigidity at a front portion of the cab without increasing the number of parts.
[0005]
[Means for Solving the Problems]
As shown in FIG. 2, the invention according to claim 1 has a pair of cab floor frames 23 provided on the bottom surface of the cab floor panel 22 in the traveling direction of the vehicle body and having a hat-shaped cross section. A cab front cross member 27 erected at the front ends of a pair of cab floor frames 23 such that a lower horizontal portion 27e continuous with an upper edge of the lower flange 27b is directed rearward with the flanges 27b and 27f on both sides forward. And a pair of tilt hinge brackets 24 screwed to the front portions of a pair of cab floor frames 23 to support the cab.
Its characteristic configuration, as shown in FIG. 1, the lower flange 23b along the bottom of the cab floor frame 23 in the extended lower horizontal portion 27e in the front end portion of the pair of the cab floor frames 23 are respectively formed, the lower flange front extension portion 24c along the 23b are respectively formed on the pair of the tilt hinge bracket 24, the front end flange portion 24d along the lower flange 27b is formed at the front end of the front end extension portion 24c, the lower flange 27b is a front end flange portion 24d The lower horizontal portion 27e is screwed to the front end extension portion 24c together with the lower flange 23b.
According to the first aspect of the present invention, both ends of the cab front cross member 27 in the vehicle width direction are fixed by the front end extension portion 24c and the front end flange portion 24d, which are the mounting portions of the tilt hinge bracket 24, so that the cab front cross member is fixed. The stiffness of the portion erected at the front end of the cab floor frame 23 is secured. In this case, since the tilt hinge bracket 24 is conventionally used, no new member is generated at this joint.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described.
As shown in FIG. 2, the tilt-type cab vehicle 10 has a pair of chassis frames 11 extending in the traveling direction thereof, and a cab mount bracket 12 is provided at a front end portion of each of the pair of chassis frames 11 (in the figure, respectively). Only one side is shown). The cab mount bracket 12 is for pivotally supporting the front end of the cab 21, and has a first pivot hole. A cab 21 is provided above the front portion of the chassis frame 11 via these cab mount brackets 12. The cab 21 is provided with a floor panel 22 and a pair of cab floor frames 23. The pair of cab floor frames 23 are formed by bending a steel material having an inverted hat shape in cross section into a channel shape, and are provided along the lower surface of the floor panel 22 at a front horizontal portion 23e and a rear end of the front horizontal portion 23e. It has a rising portion 23f that rises inclining rearward, and a substantially horizontal rear horizontal portion 23g connected to the rear end of the rising portion 23f . The pair of cab floor frames 23 thus formed is provided on the lower surface of the floor panel 22 so as to extend in the traveling direction of the cab vehicle 10 and face the pair of chassis frames 11.
[0007]
A portion of the pair of chassis frames 11 facing the rear end of the cab 21 is provided with a rear suspension portion 13 that suspends the rear portion of the cab 21. The rear suspension portion 13 includes a rear arch 13a provided between the pair of chassis frames 11, a floating arch 13b provided at a rear end of the pair of cab floor frames 23 so as to be located above the rear arch 13a, and both arches 13a. , 13b and an air spring 13c interposed therebetween. On the other hand, a tilt hinge bracket 24 is provided at a front end of each of the pair of cab floor frames 23. As shown in FIG. 1, the tilt hinge bracket 24 is screwed to a front end of the cab floor frame 23, and a first attachment for screwing the tilt hinge bracket 24 to the front end of the cab floor frame 23. In this example, three holes 23a are formed. A second mounting hole 24b having the same shape and size as the first mounting hole 23a is formed in the tilt hinge bracket 24 corresponding to the first mounting hole 23a, and male screws (not shown) are formed in the first and second mounting holes 23a and 24b. The tilt hinge bracket 24 is screwed to the front end of the cab floor frame 23 by inserting the female screw.
[0008]
The tilt hinge bracket is provided with a second pivot hole 24a having a common hole with the first pivot hole of the cab mount bracket 12 described above. The connecting pin 26 shown in FIG. 2 is inserted into the first pivot hole and the second pivot hole 24a, and the tilt hinge bracket 24 and the cab mount bracket 12 are pivotally supported. The front end of the cab 21 is pivotally supported by the pair of chassis frames 11 by the tilt hinge bracket 24 and the cab mount bracket 12, the cab 21 is tilted about the connecting pin 26, and the rear suspension portion 13 is the tilted cab 21. It is configured to reduce the impact when the vehicle descends and to fix the rear part of the cab 21 that has descended.
[0009]
A cab front cross member 27 is installed at the front ends of the pair of cab floor frames 23. The pair of cab floor frames 23 and the cab front cross member 27 are respectively composed of different members, and the cab front cross member 27 is made by processing a steel material having a hat-shaped cross section. The cab front cross member 27 has a front end of a pair of cab floor frames 23 such that a lower horizontal portion 27e continuous with an upper edge of the lower flange 27b is directed rearward with the flanges 27b and 27f on both sides having a hat-shaped cross section in front. It is erected by screws . As shown in Figure 1, a pair of side flanges 23d at the front end of the cab floor frame 23 along the surface 27d after the cab front cross member 27, and 23d, along the lower horizontal portion 27e of the cab front cross member 27 A lower flange 23b extending from the bottom of the cab floor frame 23 is formed. A third mounting hole 23c for screwing the cab front cross member 27 is formed in each of the three side flanges 23d, 23d, 23b. The cab front cross member 27 corresponding to the third mounting hole 23c is formed with a fourth mounting hole 27a having the same shape and size as the third mounting hole 23c, and is not shown in the third and fourth mounting holes 23c and 27a. The cab front cross member 27 is screwed to the front end of the cab floor frame 23 by inserting a male screw and screwing the female screw.
[0010]
A characteristic configuration of the present invention is that the tilt hinge bracket 24 has mounting portions 24c and 24d for fixing both ends of the cab front cross member 27 in the vehicle width direction. The mounting portion in this embodiment includes a front end extension 24c of a tilt hinge bracket 24 formed along a lower flange 23b among three flanges 23d, 23d, 23b at a front end of the cab floor frame 23; A front end flange portion 24d is formed at the front end of the extension portion 24c and extends along the lower flange 27b extending downward from the front end of the lower horizontal portion 27e of the cab front cross member 27. A fifth mounting hole 24e corresponding to the third mounting hole 23c formed in the lower flange 23b of the cab floor frame 23 is formed in the front end extension portion 24c, and a fourth mounting hole 27a formed in the cab front cross member 27 and The male screw (not shown) inserted into the third mounting hole 23c is further inserted into the fifth mounting hole 24e, and the female screw is screwed into the tilt hinge bracket 24, both ends of the cab front cross member 27, and the cab floor frame. 23 is fixed to the front end. A sixth mounting hole 24f is formed in the front end flange portion 24d, and a seventh mounting hole 27c is formed in the lower flange 27b of the cab front cross member 27 corresponding to the sixth mounting hole 24f. By inserting a male screw (not shown) into the sixth and seventh mounting holes 24f and 27c and screwing the female screw, the tilt hinge bracket 24 connects both ends of the cab front cross member 27 in the vehicle width direction to the cab floor frame 23. It is configured to be fixed together with the front end.
[0011]
In the vehicle body front structure of the tilt-type cab vehicle configured as described above, the cab front is extended by the front end extension portion 24c and the front end flange portion 24d which are the mounting portions of the tilt hinge brackets 24 provided at the front ends of the pair of cab floor frames 23. Since the both ends of the cross member 27 in the vehicle width direction are fixed, the rigidity of the portion of the cab front cross member 27 that is bridged to the front end of the cab floor frame 23 can be ensured. In particular, since the tilt hinge bracket 24 is formed by casting with a mold, its rigidity is high, and the rigidity of the joint portion can be reliably improved. In this case, since the tilt hinge bracket 24 is a conventionally used one, no additional member is generated at this joint, and the rigidity at the front portion of the cab 21 is improved without increasing the number of parts. be able to.
[0012]
【The invention's effect】
As described above, in the present invention, the tilt hinge bracket is configured to have the mounting portions for fixing both ends in the vehicle width direction of the cab front cross member. By fixing the both ends in the width direction, it is possible to secure the rigidity of the portion of the cab front cross member that is installed at the front end of the cab floor frame. In this case, since the tilt hinge bracket is conventionally used, the rigidity at the front portion of the cab can be improved without increasing the number of parts.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a vehicle body front structure according to the present invention.
FIG. 2 is a longitudinal sectional view of a cab having the structure.
[Explanation of symbols]
Reference Signs List 10 Tilt-type cab wheel 11 Chassis frame 12 Cab mount bracket 21 Cab 22 Cab floor panel 23 Cab floor frame 24 Tilt hinge bracket 24a Second pivot hole 24c Front end extension (attachment)
24d flange part (mounting part)
27 Cab front cross member

Claims (1)

A pair of cab floor frames (23) , each having a hat-shaped cross section , provided on the bottom surface of the cab floor panel (22) in the traveling direction of the vehicle, and the flanges (27b, 27f) formed in a hat-shaped cross section , with the front thereof positioned forward. A cab front cross member (27) erected at the front ends of the pair of cab floor frames (23) such that the lower horizontal portion (27e) continuous to the upper edge of the lower flange (27b) is directed rearward. A pair of tilt hinge brackets (24) screwed to front portions of the pair of cab floor frames (23) to support the cab, and a vehicle body front structure of a tilt type cab vehicle,
Lower flanges (23b) are formed at the front ends of the pair of cab floor frames (23) along the lower horizontal portion (27e) extending the bottom of the cab floor frame (23) , respectively.
Front end extensions (24c) along the lower flange (23b) are formed on the pair of tilt hinge brackets (24), respectively.
A front end flange portion (24d) is formed at the front end of the front end extension portion (24c) along the lower flange (27b),
The lower flange (27b) is screwed to the front end flange portion (24d),
A front body structure of a tilt type cab vehicle, wherein the lower horizontal portion (27e) is screwed together with the lower flange (23b) to the front end extension portion (24c).

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