JPH0456689A - Torsion bar structure for tilt-cab type vehicle - Google Patents

Abstract

PURPOSE:To shorten the disposition length of a cab tilting torsion bar by forming this torsion bar of a hollow torsion bar and an internal torsion bar series-disposed as a spring while being disposed concentrically in the hollow torsion bar. CONSTITUTION:In the torsion bar structure of a tilt-cab type vehicle, the end parts of a pipe 15 are rotatably inserted into the inner peripheral surface of the ring parts 12a, 13a of cab mount brackets 12, 13 fixed to both right and left ends of an automobile frame 11 through rubber members 14 and slide rings 20, and a cab 16 is fitted to the pipe 15. A torsion bar disposed between the cab 16 and the frame 11 is formed of a hollow torsion bar 21a and an internal torsion bar 21b disposed concentrically in the hollow torsion bar 21a. A torsion anchor 19 is fitted to one cab mount bracket 13, and the end part of the internal torsion bar 21b is serration-connected to the anchor 19. The end part, on the same side as this, of the hollow torsion bar 21 is jointed to the pipe 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tilt cab type vehicle such as a small truck, and particularly to an improvement of a torsion bar for tilting the cab forward.

[Conventional technology]

Generally, in cab-over type vehicles such as trucks and special vehicles, the cab (driver's seat) tilts forward by approximately 45'.
The front end of the cab is attached to the frame so that maintenance and inspection of the engine and the like disposed below the cab can be carried out.

A torsion bar is used as a torque source for tilting the cab.

The conventional torsion bar structure is explained using Fig. 2.
In FIG. 2, reference numeral 11 indicates a seven rem of an automobile, and cab mount brackets 12 and 13 are fixed to both left and right ends of this frame 11. These cab mount brackets +2. Rubber members 14.14 for cab mounts are fitted onto the inner peripheral surfaces of the annular portions 12a, 13a of H, and these rubber members 14.14. IH Koha pipe I5
The end portion of the holder is rotatably inserted through a sliding ring 20, which will be described later. A cab 16 is fixed to this pipe 15 by brackets 17.17. Further, a torsion bar anchor 19 is attached to the annular portion 132 integrally with the cab mount bracket 13, and the pipe 15
One torsion bar 21 is inserted into the torsion bar 21 , and one end of this torsion bar 21 is splined to the torsion bar anchor 19 , and the other end of the torsion bar 21 is splined to the other end of the pipe 15 . combined.

Furthermore, the sliding ring 20 has wear resistance and
It is formed into a cylindrical shape from a material with low frictional resistance, and a seven-ring portion 20a is provided at one end. and,
This seven-ring portion 20a faces the outer surface of the bracket 17. Therefore, rubber member】4 and pipe 15
The frictional resistance between the two is reduced by the sliding ring 20,
The torque loss of the torsion bar 21 is reduced.

With the torsion bar structure constructed in this way, the cab j6 can be tilted by releasing a hook (not shown) provided at the rear end of the cab. That is, when the hook is released, the cab is tilted (tilted forward) together with the pipe 15 by the restoring force of the torsion bar 21 with the torsion bar 21 as the center of rotation. At this time, since the end of the pipe 15 is supported by the sliding ring 20 with low frictional resistance, the torsion bar 20
The torque loss of 1 can be reduced, and the cab can be tilted easily with a small torque.

[Problem to be solved by the invention]

By the way, in the torsion bar structure of the conventional tilt cab type vehicle as described above, the restoring force of the torsion bar is used to generate the torque that flips the cab forward. Therefore, when the cab is in a normal state, a large stress is applied to the torsion bar, and in order to withstand that stress,
It is necessary to use a torsion bar of sufficient length.

As a result, the conventional torsion bar anchor
There was a problem in that the lateral protrusion dimension A) was large, which adversely affected the layout of the headlights, intake piping, etc. of the automobile.

The present invention attempts to solve these problems in the torsion bar structure of conventional tilt cab type vehicles.The present invention aims to solve these problems in the torsion bar structure of conventional tilt cab type vehicles. To provide a torsion bar structure for a tilt cab type vehicle in which the arrangement length of the torsion bar is shortened by configuring it with a solid torsion bar arranged in series as a spring.

[Means to solve the problem]

In order to achieve the above-mentioned object, the torsion bar structure of the tilt cab type vehicle of the present invention includes a pair of left and right cab mount brackets attached to the frame of the vehicle, and a torsion bar structure for each of the pair of left and right cab mount brackets in the tilt cab type vehicle. It has a pipe that is rotatably supported via a rubber member for the cab mount and to which the bottom plate of the cab is attached, and a torsion bar disposed inside the pipe, and the torsion bar is a hollow torsion bar. , formed by a solid torsion bar of approximately the same length arranged concentrically inside the hollow torsion bar, with the hollow torsion bar and the solid torsion bar at one end. The ends of the solid torsion bar opposite to the above are connected to either of the pair of left and right cab mount brackets via the torsion bar anchors, and the hollow torsion bar It is characterized in that the end of the bar on the same side is connected to the pipe.

[For production]

In the above-described torsion bar structure for a tilt cab type vehicle of the present invention, the torsion bar includes a hollow torsion bar and a solid torsion bar of approximately the same length that is arranged concentrically inside the torsion bar and connected to each other at one end. It consists of
In other words, since both torsion bars are arranged in series as springs, but mechanically arranged in parallel, the torsion bar as a whole when installed in a car while keeping the total length of the torsion bar sufficiently long. The total length can be shortened.

〔Example〕

Hereinafter, a torsion bar structure for a tilt cab type vehicle as an embodiment of the present invention will be explained with reference to the drawings. FIG. 1 is a longitudinal sectional front view thereof. Note that the same reference numerals in FIG. 1 as in FIG. 2 indicate substantially the same members.

Also in this embodiment, the torsion bar is disposed between the cab 16 and the frame 11 in a tilt cab type vehicle, and the torsion bar is a hollow torsion bar 21.
a, and a solid torsion bar 21b arranged concentrically inside the torsion bar 21b.

Both of the toshimin bars 21a and 21b are formed to have approximately the same length, and are differentially serrated connected at one end (the left end in FIG. 1).

A torsion bar anchor 19 is attached to one of the cab mount brackets 13, and the opposite end of the solid torsion bar 21b is serrated to the torsion/(-anchor 19). The end of 21a on the same side is connected to pipe 15.

Pipe 15 and hollow torsion bar 21! In order to increase the welding length during welding, the pipe 15 is divided as shown in FIG.
It is preferable to perform welding with a.

Note that it is also possible to use serration bonding instead of welding this portion.

With the above configuration, the torsion bar is composed of the hollow torsion bar 21a and the solid torsion bar 21b so that although they are arranged in series, they are mechanically parallel, so the overall length as a spring is It is possible to obtain a torsion bar with a short geometric overall length while keeping the torsion bar sufficiently long.

In other words, the solid torsion bar 21b bears the torque for about 39" of the 45° tilt angle of the cab, and the hollow torsion bar 21! bears the torque for about 66". The torsion bar (
The total length (geometrically) can be kept to approximately the same dimension as the distance between the pair of left and right cab mount brackets 12 and 13.

Note that the portion indicated by arrow B in the figure corresponds to the overhang in the conventional device, but in the present invention, this overhang can be eliminated, which is advantageous in terms of space.

〔Effect of the invention〕

As described in detail above, the torsion bar structure for a tilt cab vehicle according to the present invention provides the following effects and advantages.

(1) Since the overall length of the spring can be made long enough, gear 7
It is possible to obtain a torsion bar that can withstand large stress as a torque source for tilting.

(2) Since torsion bars with geometrically short dimensions can be obtained, the degree of freedom in layout of parts such as automobile headlamps and intake pipes is increased.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a torsion bar structure of a tilt cab type vehicle as an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of a torsion bar structure of a conventional tilt cab type vehicle. 11...Frame! 2. H...Cab mount bracket, 14...Rubber member for cab mount,
15...Pipe, 19...Torsion bar anchor, 211...Hollow torsion bar, 21b...Solid torsion bar agent Patent attorney Yoshihiko Iinuma Isao Adachi

Claims (1)

[Claims] In a tilt cab type vehicle, there is a pair of left and right cab mount brackets attached to the frame of the vehicle, and the bottom plate of the cab is rotatably supported by each of these pair of left and right cab mount brackets via a rubber member for cab mount. The torsion bar is provided with a pipe to be attached and a torsion bar arranged inside the pipe, and the torsion bar is arranged concentrically with the hollow torsion bar inside the hollow torsion bar. and a solid torsion bar of the same length, the hollow torsion bar and the solid torsion bar are connected to each other at one end, and the hollow torsion bar and the solid torsion bar are connected to each other at one end, and the hollow torsion bar and the solid torsion bar are connected to each other at one end. An end portion of the hollow torsion bar is connected to one of the pair of left and right cab mount brackets via a torsion bar anchor, and an end portion of the hollow torsion bar on the same side is connected to the pipe. Torsion bar structure of tilt cab type vehicle.