JPH0114550Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a tilting device for an automobile cab.

First, an example of a conventional device will be explained with reference to FIG. In the figure, numeral 2 is the cab of the truck, 4 is the cab frame forming the skeleton of the cab, 6 is the chassis frame, 8 is the cab-side bracket fixed to the front end of the cab frame 4, and 10 is the front end of the chassis frame 6. frame side bracket fixed to,
12 is a connecting arm whose front end is pivoted to the frame side bracket 10 and its rear end is pivoted to the cab side bracket 8, and 14 is a coil spring compressed between the connecting arm and the cab side bracket 8. Reference numeral 16 denotes a bridge-shaped subframe fixed to the chassis frame 6, 18 a floating bar supported by the subframe via a spring 20, and 22 a well-known locking mechanism (not shown) supported by the rear end of the cab frame 4. This is a bracket fixed to the floating bar 18 by a bracket. Reference numeral 24 designates a power cylinder having a hydraulically operated telescoping mechanism, which is pivotally connected to the cab frame 4 at one end and to the chassis frame 6 at the other end.

However, in the conventional device described above, when the power cylinder 24 is driven to tilt the cab 24, the maximum tilt angle is usually such that the center of gravity of the cab 2 is slightly forward of the vehicle from the axle attachment point between the connecting arm 12 and the frame side bracket 10. Therefore, when the cab 2 is at its maximum tilt angle, the cab 2 tries to further rotate counterclockwise (see Fig. 1) around the shaft joint between the connecting arm 12 and the frame side bracket 10. The rotational force of the cab 2 is balanced with the driving force of the power cylinder 24, so that the cab 2 is held at the maximum tilt angle position.

Therefore, the vehicle should be stopped on the road, etc., and cab 2
When tilting the cab 2, the load applied to the coil spring 14 changes due to wind pressure or vibrations caused by the running of other vehicles, and the amount of compression of the coil spring 14 changes, making it impossible to determine the maximum tilt angle of the cab 2. There was a problem in which cab 2 could not be fixed at the tilt angle, causing the cab 2 to wobble, causing anxiety for maintenance and inspection workers.

The present invention has been devised in view of the above, and embodiments thereof will be described in detail below with reference to FIGS. 2 to 4.
Note that parts that are substantially the same as those of the conventional device described above are designated by the same reference numerals as those used above, and detailed description thereof will be omitted.

The first embodiment shown in FIGS. 2 and 3 is
A link 28 is provided with one end connected to the rear end of the connecting arm 12 and the other end connected to the bracket 26 on the chassis frame 6, and the link 28 is connected so as to form a dogleg shape that opens forward. A tension spring 32 is provided which is connected at one end and connected to a bracket 30 on the chassis frame 6 at the other end. As shown in FIG. 3, the maximum tilt angle of the cab 2 is determined by slightly extending the power cylinder 24 and forcibly displacing the coil spring 14 from the state in which the power cylinder 24 is extended and the link 28 is displaced in a straight line. It is set so that it is somewhat reduced in size.

To explain the tilt operation in this embodiment, first, the power cylinder 24 is extended, and the cab 2 is moved from the rear of the vehicle to the shaft connection between the power cylinder 24 and the cab frame 4 until the center of gravity of the cab 2 is directly above the shaft connection. 2, the connecting arm 12 rotates counterclockwise (FIG. 2) around the pivot point between the connecting arm 12 and the frame-side bracket 10, and then the center of gravity of the cab 2 moves between the power cylinder 24 and the cab frame 4. When the cab 2 moves toward the front of the vehicle from the pivot point between the connecting arm 12 and the cab-side bracket 8, the cab 2 rotates around the pivot point between the connecting arm 12 and the cab-side bracket 8 while compressing the coil spring 14, so that the rotational movement of the connecting arm 12 is small.

Further extend the power cylinder 24 and link 2
When the power cylinder 24 is further extended after the coil spring 14 is in a straight line, the connecting arm 12 is prevented from rotating counterclockwise by the link 28, so the cab 2 is forced to contract while the coil spring 14 is forcibly contracted. 12
The maximum tilt angle, that is, the center of gravity of the connecting arm 12 and the frame side bracket 1, is
It is located slightly in front of the vehicle from the shaft attachment point with 0. According to the above configuration, the coil spring 14 is connected to the power cylinder 2 in the maximum tilt angle state of the cab 2.
4, and the connecting arm 12 is prevented from rotating counterclockwise around the pivot point between the connecting arm 12 and the frame side bracket 10 by the link 28, so that it is prevented from rotating by the link 28 due to wind pressure, vibrations of other vehicles, etc. It is possible to prevent the cab 2 from wobbling.

In the second embodiment shown in FIG. 4, the upper end of the link 28 is connected to a pin 34 that pivotally connects the cab side bracket 8 and the connecting arm 12, and is similar to the first embodiment. be effective. In both of the above embodiments, a cable or chain can be used instead of the link 28, and it is also possible to use a cable or chain together with a rod.

[Brief explanation of the drawing]

1 is an overall side view showing an example of a conventional device, FIG. 2 is an enlarged view of main parts showing a first embodiment of the present invention, FIG. 3 is an enlarged view showing the maximum tilt state of the device shown in FIG. FIG. 4 is an enlarged view of main parts showing the second embodiment. 2...Kiyab, 4...Kiyab frame, 6...
Shaft frame, 8... Cab side bracket, 1
0... Frame side bracket, 12... Connecting arm, 14... Coil spring, 24...
...Power cylinder, 28...link.

Claims (1)

[Scope of utility model registration request] A cab-side bracket fixed to the front end of the cab frame, which forms the skeleton of the cab, a frame-side bracket fixed to the front end of the chassis frame, and a first pin attached to the front end to the frame-side bracket and the rear end to the cab-side bracket, respectively. and a connecting arm pivoted by a second pin, a coil spring compressed between the cab side bracket and the connecting arm, and a telescoping mechanism connected at one end to the cab frame and at the other end to the chassis frame. and a drive device having one end connected to the connecting arm at a position eccentric from the first pin, the other end connected to the chassis frame, and an intermediate portion bent to prevent the one end and the other end of the driving device from approaching each other. A connecting arm rotation angle limiting member that allows but prevents a separation beyond a set value is provided;
When the cab is tilted by the drive device, the rotation angle limiting member prevents the connecting arm from rotating above the predetermined amount around the first pin, and forcibly compresses the coil spring. A tilting device for an automobile cab, characterized in that the cab is tilted around the second pin.