JP3849392B2 - Cab mount device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cab mount device for holding a cab tilt shaft attached to a lower portion of a front end of a cab in a tilt cab vehicle.
[0002]
[Prior art]
In the conventional tilt cab vehicle, as illustrated in FIG. 3, the hinge brackets 2 are bolted to the front ends of the left and right chassis frames 1, respectively, and are concentrically disposed in the shaft holes 3 of the hinge bracket 2. Mounted rubber 7 composed of inner pipe 4 and outer pipe 5 and rubber material 6 filled between both pipes 4, 5 is mounted and attached to the lower part of the front end of the cab via a cab frame 8 and a cab stay 9. A shaft 10 is inserted into the inner pipe 4 of the mount rubber 7, and a lower portion of the front end of the cab is supported so as to be rotatable about the cabbutylt shaft 10.
[0003]
In this case, since the hinge bracket 2 is required to have a complicated shape because of its relative relationship with the peripheral parts and functional reasons, a cast product is used in consideration of cost. As indicated by the chain line, it is necessary to remove the casting gradient 11 generated during casting by cutting, and in order to prevent the mount rubber 7 from slipping out of the vehicle (to the right in FIG. 1), the inner pipe 4 A flange 12 is formed on the inner side of the vehicle, and is engaged with the peripheral end surface of the shaft hole 3 in the hinge bracket 2 in the vehicle width direction. Therefore, the apparatus is formed by cutting the shaft hole 3 or forming the flange 12. It was inevitable that the manufacturing cost of the would increase.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to make it possible to inexpensively manufacture a mounting rubber retaining mechanism for holding a cab butlt shaft in a tilt cab vehicle.
[0005]
[Means for Solving the Problems]
For this reason, in a tilt cab vehicle, the cab mount device according to the present invention is attached to a cast hinge bracket that is fixed to a chassis frame to form a shaft hole, and to a cab stay that is mounted in the shaft hole and is provided on the lower surface of the cab. And a mounting rubber for holding the carbylate shaft, and the parting line of the detachable mold on both sides with respect to the shaft hole at the time of casting is offset to the opposite side to the cab stay, and the part of the parting line is inside the shaft hole. A reduced diameter portion is formed, and the mount rubber is configured to engage with the reduced diameter portion in the vehicle width direction.
[0006]
That is, when the hinge bracket is cast, the parting line of the mold part on both sides with respect to the shaft hole is offset to the opposite side of the cab stay, and the reduced diameter part is formed in the shaft hole at the parting line part due to the draft of the mold part. The mounted rubber that holds the cab butlt shaft is engaged with the reduced diameter part in the vehicle width direction, so that the mount rubber is surely pulled out from the shaft hole of the hinge bracket to the opposite side of the cab stay. On the other hand, it is very easy to form the reduced diameter part by offsetting the shaft hole in the hinge bracket to the opposite side of the cab stay compared with the conventional device, and the manufacturing cost of the cab mount device is easy. Can be reduced.
[0007]
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.
In FIG. 1, cast hinge brackets 2 are bolted to the front ends of the left and right chassis frames 1 of the tilt cab vehicle, respectively, and inner pipes 4 and outer pipes 5 that are concentrically arranged in the shaft holes 3 of the hinge brackets 2 and both. A mount rubber 7 comprising a rubber material 6 filled between the pipes 4 and 5 is mounted, and a carb shaft 10 attached to a lower portion of the front end of the cab via a cab frame 8 and a cab stay 9 is connected to an inner portion of the mount rubber 7. The cab is inserted into the pipe 4 so that the lower portion of the front end of the cab is supported so as to be rotatable about the carbyl shaft 10.
[0008]
In the shaft hole 3 of the hinge bracket 2, the parting line 20 of the punching die at the time of casting is largely offset toward the vehicle outer side (right side in FIG. 1), and the cast slope surface 21 on the vehicle inner side is cast out. The shaft hole 3 is particularly reduced in diameter at the parting line 20.
[0009]
On the other hand, the outer pipe 5 of the mount rubber 7 has an outer peripheral surface having a slope that matches the cast slope surface 21 of the hinge bracket shaft hole 3, so that the reduced diameter portion of the hinge bracket shaft hole 3 and the outer circumferential surface of the hinge bracket shaft hole 3 are engaged in the vehicle width direction. Will match.
[0010]
Accordingly, the mount rubber 7 is automatically prevented from slipping out of the vehicle (right side in FIG. 1), and the inner surface of the hinge bracket shaft hole 3 is attached to mount the mount rubber 7 as in the above-described conventional device. There is no need for cutting or forming the flange 12 for retaining the outer pipe 5 of the mount rubber 7, and the mount rubber 7 is originally provided with the outer pipe 5 in order to increase the durability after the rubber material 6 is vulcanized and bonded. Therefore, if the above-mentioned gradient is formed on the outer pipe 5 by using the drawing process, the cost increase of the mount rubber 7 can be easily suppressed. As compared with the above, the manufacturing cost of the cab mount device can be reduced.
[0011]
In the embodiment shown in FIG. 2, the cast hinge bracket 2 bolted to the front ends of the left and right chassis frames 1 of the tilt cab vehicle has a flange at the end of the shaft hole 3 on the vehicle outer side (right side in FIG. 2). 30 is formed, and the reduced diameter portion 31 is formed in the shaft hole 3 by the flange 30, and the mount rubber 7 mounted in the hinge bracket shaft hole 3 is engaged with the reduced diameter portion 31 in the vehicle width direction. ing.
[0012]
Therefore, the mount rubber 7 is prevented from being pulled out to the vehicle outer side by the reduced diameter portion 31, and it is not necessary to form the retaining flange 12 on the outer pipe 5 of the mount rubber 7 as in the conventional device. Therefore, the manufacturing cost of the cab mount device can be easily reduced.
[0013]
In the above embodiment, the cab stay on the lower surface of the cab is disposed on the inner side in the vehicle width direction of the hinge bracket. However, the cab stay on the lower surface of the cab is hinge bracket because of the large size in the vehicle width direction of the cab. In the embodiment, the reduced diameter portion of the hinge bracket shaft hole in the above embodiment is provided on the inner side in the vehicle width direction opposite to the cab stay, and the mount rubber is formed on the reduced diameter portion. Needless to say, if the engagement is made inward in the vehicle width direction, it is possible to reliably prevent the mount rubber from slipping out inward in the vehicle width direction.
[0014]
【The invention's effect】
In the cab mount device according to the present invention, with respect to the reduced diameter portion formed to be offset toward the opposite side of the cab stay of the hinge bracket shaft hole by the parting line of the detachable mold on both sides with respect to the hinge bracket shaft hole at the time of casting. Since the mount rubber that holds the cab butlt shaft is engaged in the vehicle width direction, it is possible to reliably prevent the mount rubber from slipping out of the hinge bracket shaft hole to the opposite side of the cab stay and the hinge bracket shaft. It is relatively easy to form the reduced diameter portion by deviating toward the opposite side of the hole from the cab stay, and the manufacturing cost can be easily reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part in an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of an essential part in another embodiment of the present invention.
FIG. 3 is a longitudinal sectional view of a main part of a conventional device.
FIG. 4 is a partially enlarged longitudinal sectional view of the conventional device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Chassis frame 2 Hinge bracket 3 Shaft hole 7 Mount rubber 10 Cabbutylt shaft 21 Casting gradient surface 30 Flange 31 Reduced diameter part

Claims (1)

The tilt cab vehicle has a cast hinge bracket that is fixed to the chassis frame and has a shaft hole, and a mount rubber that is mounted in the shaft hole and that is attached to the cab stay on the lower surface of the cab to hold the cab tilt shaft. The parting line of the mold to the both sides with respect to the shaft hole at the time of casting is offset to the opposite side to the cab stay, and a reduced diameter part is formed in the shaft hole at the part of the dividing line, and the reduced diameter part A cab mount device configured such that the mount rubber engages in the vehicle width direction.

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