JP3849393B2 - Cab mount structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cab support mechanism in a tilt cab vehicle, and more particularly to a cab mount structure that absorbs impact energy to the cab.
[0002]
[Prior art]
In the conventional tilt cab vehicle, as shown in FIGS. 6 and 7, the lower part of the cab hinge bracket 2 is fixed to the outer surface of the front end of each of the left and right chassis frames 1 and attached to the lower part of the front end of the cab. A cablutt shaft (not shown) extending in the direction passes through a shaft hole 3 formed in the upper portion of the cab hinge bracket 2 so that the front end of the cab is supported rotatably with respect to the left and right chassis frames 1. Since the bracket 2 is required to have a complicated shape due to its relative relationship with its peripheral parts and functional reasons, a cast product is used in consideration of cost.
[0003]
However, when an impact load is applied to the front of the cab above the left and right chassis frames 1, such as when the vehicle collides with the front platform, and the impact load is applied to the cab. However, the cab hinge bracket 2 has a problem that the strength against the impact load is relatively low as a characteristic of the cast product.
[0004]
On the other hand, in the cabylt mechanism exemplified in JP-A-11-171054, the cab hinge bracket is attached to the chassis with the strength setting bolt and the strength pin, and when the cab hinge bracket receives an impact, the strength setting bolt is broken. The impact force is absorbed and the impact force is transmitted to the cab via the strength pin. In this case, it is a precondition that the strength of the cab hinge bracket itself against the impact load is sufficiently high. Therefore, the above problems are not solved at all.
[0005]
[Problems to be solved by the invention]
The present invention is intended to reliably absorb impact energy to a cab in a tilt cab vehicle by a simple and inexpensive cab mount structure.
[0006]
[Means for Solving the Problems]
Therefore, the cab mount structure according to the present invention includes a cast cab hinge bracket in which a lower part is fixed to the front end of each of the left and right chassis frames and a shaft hole is formed in the upper part, and a lower part of each of the front ends of the left and right chassis frames. And a flat steel plate support with a shaft hole formed in the upper part, and the cab hinge bracket and the support are arranged adjacent to each other, and fastened together with the chassis frame, and the lower part of the front end of the cab A carb shaft that is attached to the vehicle and extends in the vehicle width direction passes through the shaft hole of the cab hinge bracket and the support to support the cab.
[0007]
Therefore, when an impact load is applied to the front of the cab above the left and right chassis frames, and the impact load acts on the upper part of the cab hinge bracket from the cab through the cablt shaft, the steel plate support with the lower part fixed to the chassis frame Since the impact load also acts on the upper part of the hood, the support can be greatly deformed to absorb impact energy, and even if the cab hinge bracket breaks, the cab is separated from the chassis frame. This can be easily prevented.
Moreover, since the support is made of a flat steel plate having a simple shape, the entire mounting structure can be made very simple and inexpensive.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In the following, each embodiment of the present invention will be described by assigning the same reference numerals to the equivalent parts of the conventional apparatus.
1 and 2, the lower parts of the cast cab hinge bracket 2 and the flat steel plate support 10 are respectively bolted to the outer surfaces of the front end of the left and right chassis frame 1 of the tilt cab vehicle so as to be adjacent to each other. A cablutt shaft (not shown) that is attached to the lower portion and extends in the vehicle width direction passes through a shaft hole 3 formed in the upper portion of the cab hinge bracket 2 and a shaft hole 11 formed in the upper portion of the support 10. The lower part of the front end is supported so as to be rotatable with respect to the left and right chassis frame 1. The outline of the support 10 is formed so as to substantially match the cab hinge bracket 2.
[0009]
That is, in the above cab mount structure, the cab hinge function during normal driving and cab butting is mainly shared by the cab hinge bracket 2 that is a cast product, but the vehicle collides with a barrier with a ground clearance, and the left and right chassis frames. When an impact load is applied to the front surface of the cab above 1, the impact load directly acts on the cab hinge bracket 2 from the cab. Therefore, the cab hinge bracket 2 has a strength against the impact load as a characteristic of a cast product. Even if it is comparatively low, the steel plate support 10 is greatly deformed rearward due to the impact load and can absorb the impact energy, so that the impact force applied to the vehicle body can be reduced and the cab is separated from the chassis frame 1. Is easily prevented by the presence of the cab hinge bracket 2 and the shock load is chassis. It can be transmitted to the frame 1.
[0010]
In addition, since the cab hinge bracket 2 having a complicated shape is a relatively inexpensive cast product and a cab mount is configured by combining this with a steel plate support 10 having a simple shape, the overall structure is very simple and inexpensive. There is a feature that can be.
[0011]
In the embodiment shown in FIG. 3, the lower portion of the cast cab hinge bracket 2 is bolted over the front outer surface and the upper surface of the chassis frame 1, and the flat steel plate support 10 adjacent to the outer surface of the cab hinge bracket 2. The lower portion is bolted to the outer surface of the front end of the chassis frame 1 so that the cabbutt shaft is inserted through the shaft hole 3 at the top of the cab hinge bracket 2 and the shaft hole 11 at the top of the support 10. It is possible to achieve the same effect as that.
[0012]
In the embodiment shown in FIG. 4, the lower portion of the cast cab hinge bracket 2 is bolted over the front end outer surface and the upper surface of the chassis frame 1, and the stiffener 20 fixed to the front end inner surface side of the chassis frame 1. The lower part of the flat steel plate support 10 is bolted to the side, the upper part of the cab hinge bracket 2 and the upper part of the support 10 are adjacent to each other, and the shaft hole 3 above the cab hinge bracket 2 and the shaft hole 11 above the support 10 are It is comprised so that a shaft may be inserted, and there can exist an effect equivalent to each said embodiment.
[0013]
Further, in the embodiment shown in FIG. 5, a steel plate support 10 is cast in the cast cab hinge bracket 2 in advance, and the lower portions of the cab hinge bracket 2 and the support 10 are both bolted to the outer surface of the chassis frame 1. The cabbutt shaft is inserted through the shaft hole 3 at the upper part of the cab hinge bracket 2 and the shaft hole 11 at the upper part of the support 10, and the cab can be operated in the same manner as the above embodiments. Since the hinge bracket 2 and the support 10 are integrated, there is an advantage that the assembling is simplified, and the entire volume can be reduced.
[0014]
【The invention's effect】
In the cab mount structure according to the present invention, an impact load is applied to the front surface of the cab above the left and right chassis frames of the vehicle, and the impact load impacts from the cab to the upper part of the cab hinge bracket and the steel plate support via the cab tilt shaft. When the load is applied, the support can be greatly deformed to absorb the impact energy, so that the impact force applied to the vehicle body can be mitigated, and at the same time, even if the cab hinge bracket breaks, the cab is separated from the chassis frame. This can be easily prevented by the support, and the impact load can be reliably transmitted to the chassis frame.
Further, since the support is made of a flat steel plate having a simple shape, there is an advantage that the entire mounting structure can be made very simple and inexpensive.
[Brief description of the drawings]
FIG. 1 is a front view of a main part in an embodiment of the present invention.
FIG. 2 is a view taken in the direction of arrow II in FIG.
FIG. 3 is a front view of an essential part in another embodiment of the present invention.
FIG. 4 is a front view of main parts in another embodiment of the present invention.
FIG. 5 is a front view of a main part in another embodiment of the present invention.
FIG. 6 is a front view of a main part of a conventional device.
7 is a view taken along arrow VII in FIG. 6;
[Explanation of symbols]
1 Chassis frame 2 Cab hinge bracket 10 Support 20 Stiffener

Claims (1)

In a tilt cab vehicle, a cast cab hinge bracket having a lower part fixed to the front end of the left and right chassis frame and a shaft hole formed in the upper part, and a flat part having a lower part fixed to the front end of the left and right chassis frame and a shaft hole formed in the upper part. A cab hinge shaft extending in the vehicle width direction is attached to the lower portion of the front end of the cab and is fastened together with the chassis frame. A cab mount structure for supporting the cab by inserting the shaft holes of the cab hinge bracket and the support.

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