JPS599992Y2 - Crawler tractor suspension system - Google Patents

Description

[Detailed description of the invention] The present invention relates to a suspension system for a crawler tractor such as a bulldozer, and its purpose is to hydroelastically support the vehicle body, improve comfort, and reduce noise. The present invention aims to provide a suspension system for a crawler tractor which is capable of improving hill-climbing performance, improving ease of escape from wetlands, and improving maintainability from the underside of the vehicle body.

The structure will be explained below based on the embodiment shown in the drawings.

In the figure, 1 and 2 are the left and right crawler devices, 3 is the main frame,
The rear part of the main frame 3 is pivotally supported to the rear parts of the left and right crawler apparatuses 1 and 2, and the front part is supported so as to be movable up and down relative to the crawler apparatuses 1 and 2 and to be able to absorb fluid.

That is, levers 4 and 5 are pivotally attached to both sides of the front part of the main frame 3 so as to be rotatable left and right, and the tips of the levers 4 and 5 are mounted on the track frame of each crawler device 1 and 2 in the left and right direction. It is movably placed on the

A cylinder 7 is connected to one of the levers 4 and 5 via a rod 6, and a piston 9 that fits into the cylinder 7 is connected to the other via a rod 8.
5 is connected to the cylinder 7 and the piston 9 through a fluid expansion and contraction device 10.

Both chambers 7a are partitioned by the piston 9 of the cylinder 7,
7b is connected to a fluid pressure source 12 such as a hydraulic pump via a gate valve 11 that can be remotely controlled from the driver's seat.

Further, accumulators 13, 13 are connected to both circuits between the compartments 7a, 7b and the switching valve 11.

In the above structure, the main frame 3 is supported by the fluid pressure of the fluid expansion/contraction device 10 by turning off the switching valve 11.

At this time, the sealed fluid pressure changes elastically in the accumulators 13, 13, and the main frame 3 is supported hydroelastically.

When the switching valve 11 is switched to extend the fluid expansion/contraction device 10, the main frame 3 becomes lower with respect to the crawler devices 1 and 2, and when it is shortened, the main frame 3 becomes higher.

Figure 2 shows a slope-climbing condition, and shows that by lowering the main frame 3, the center of gravity of the vehicle moves from G1 to G62 and becomes lower, and the inclination angle of the vehicle relative to the slope of the hill decreases by O. .

The present invention is as described above, and levers 4 and 5 which are rotatable in the left and right direction are pivoted on both sides of the front part of the main frame 3 whose rear part is pivoted to the left and right crawler devices 1 and 2. 4
.
An accumulator 13.1 is connected through a fluid expansion/contraction device 10 that expands and contracts with fluid pressure supplied through the fluid expansion/contraction device 10 and the switching valve 11. 13 was connected to construct a suspension system for a crawler tractor.
The main frame 3 and the vehicle body equipped thereon are hydroelastically supported, improving comfort, and the crawler device 1
, 2 can be reduced.

By lowering the height of the main frame 3 relative to the crawler devices 1 and 2, the entire vehicle body can be tilted forward, thereby improving hill climbing performance.

On the other hand, by increasing the height of the main frame 3, the ability to escape from wetlands where the protector can get stuck is improved, and by increasing the height of the vehicle body, maintainability from the underside of the vehicle body is improved.

[Brief explanation of drawings]

FIG. 1 is a structural explanatory diagram showing the main parts of the present invention, and FIG. 2 is an operational explanatory diagram showing a slope-climbing state. 1 and 2 are crawler devices, 3 is a main frame, 4 and 5 are levers, 10 is a fluid expansion and contraction device, 11 is a switching valve, and 13 is an accumulator.

Claims (1)

[Scope of utility model registration request] There are levers 4, 5 on both sides of the front part of the main frame 3, whose rear part is pivoted to the left and right crawler devices 1, 2, and which are rotatable in the left and right directions.
The tip of each lever 4, 5 is placed on each crawler device 1, 2 so as to be movable in the left-right direction, and each lever 4, 5 is supplied via a switching valve 11. A crawler tractor characterized in that the fluid expansion and contraction device 10 and the switching valve 11 are connected via a fluid expansion and contraction device 10 that expands and contracts with fluid pressure, and an accumulator 13, 13 is connected in the circuit between the fluid expansion and contraction device 10 and the switching valve 11. Suspension system.