JPS6040391Y2 - Driver cab support device for tracked vehicles - Google Patents

Description

[Detailed description of the invention] This invention relates to a cab support system for tracked vehicles such as bulldozers, and its purpose is to prevent engine vibrations, vibrations transmitted from the roadbed during driving, and vibrations transmitted from work equipment during work. To provide a driver's cab support device for a tracked vehicle that can prevent transmitted vibrations from being transmitted from the vehicle body to the driver's cab, and can stably suspend the driver's cab without tilting forward or backward or left or right. It is.

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

In the figure, 1 is a frame that constitutes the body of a tracked vehicle, 2 is a driver's cab supported by this frame 1, and 2a is a driver's cab that constitutes the base of this driver's cab 2.

Although not shown, the driver's cab 2a is equipped with various devices necessary for operation, such as a driver's seat, a control lever device, and an instrument panel.

The driver's cab 2a is suspended from the frame 1 via four air springs 3.

Each air spring 3 is connected by a pipe 4 to an air supply device (not shown).

Further, a stopper 5 made of an elastic material is installed inside the air spring 3, and is elastically fixed in a state in which it is bent by a stroke a in the vertical direction.

The frame 1 and the bottom of the driver's cab 2a are connected to a first connecting lever 6.6 located on the left and right sides and connecting the two in the front-back direction.
The two are connected by a second connecting lever 7 that connects them in the left-right direction at approximately the center of gravity of the driver's cab 2a.

In the first coupling lever 6.6 and the second coupling lever 7, the first coupling lever 6.6 is arranged in the front-rear direction, and the second coupling lever 6.6 is
The coupling levers 7 are inclined in the left and right directions.

Further, the frame 1 and the upper part of the driver's cab are connected by a third connecting lever 8 that connects both in the front-rear direction.

Both ends of the first coupling lever 6 are as shown in FIG.
It is fixed to a shaft 9.10 fixed to the frame 1 and the driver's cab 2a side via an annular elastic body 11, and a thrust elastic body 14 is interposed.

The end of the second coupling lever 7 has a structure as shown in FIG. 6, which is substantially the same as the end of the first coupling lever 6.

15 is a damper provided to absorb impact loads, and 16 is an upper limit stopper of the driver's cab 2.

Thus, the driver's cab 2a is supported by the air spring 3 in a vibration-proof manner against vibrations of the frame 1.

At this time, depending on the vibration of the frame 1, force acting on the driver's cab 2a to swing back and forth and left and right is applied, but the force in the back and forth direction is supported by the first coupling lever 6.6, and the force in the left and right direction is supported by the second coupling lever. It is supported by lever 7.

In addition, each lever also swings in the vertical direction due to the vertical movement of the driver's cab 2a, but this swing is absorbed by each annular elastic body.

In addition, in the above operation, both ends of each coupling lever 6.7 are connected to the frame 1 and the driver's cab 2a via an annular elastic body.
When each coupling lever 6.7 swings relative to the frame 1 due to vertical movement of the driver's cab 2a due to being fixed to the side shaft, this swinging displacement is absorbed by each of the elastic bodies,
This portion also absorbs the vibrations of the driver's cab 2a.

Further, even when each coupling lever swings, the respective ends slide and do not fit together, so there is no need for lubrication and grease, making it possible to achieve maintenance-free operation.

Also, when the cab 2a causes vertical or lateral vibration, the elastic bodies of the respective joints of the first and second joint levers 6.7 provide a buffering effect, and the air springs 3 provided at the four corners act as a buffer. The force difference absorbs and damps each of the above-mentioned swing motions.

Further, by using the air spring 3, the spring constant can be made smaller than that of a general mechanical elastic body, and a large damping effect can be expected.

The vibration-proofing effect of elastic bodies is shown below.

In other words, the natural frequency of a mechanical device is determined by the weight of the machine and the spring constant of the anti-vibration rubber, where K is the spring constant, W is the weight,
If g is the gravitational acceleration and fN is the natural frequency, then 5 fN=-2? r, and on the other hand, if the frequency of vibration generated from the machine is f, then the frequency ratio U is U = Wataru, where TR is the vibration transmission rate, F is the excitation force generated from the machine, and Fo is the transmission force from the machine to the foundation. If the excitation force is I TR=-=l l...
...(1) ol-U2, where U''j2 becomes TR:l, and the anti-vibration effect is zero.

In order to obtain a sufficient vibration damping effect, it is sufficient to set U to 1, and generally U=2 to 3.

In other words, according to the above formula (1), fN → small, U → large,
A kneading agent with a small fN will have a small kneading effect and a large buffering effect.

From the above, by using an air spring to reduce the spring constant K as in the present invention, the natural frequency fN becomes smaller and a buffering effect can be expected.

The driver's cab 2a is suspended from the vehicle body side by an air spring 3, and a first connecting lever 6 is provided between the lower part of the driver's cab 2a and the vehicle body to connect them in the front-rear direction, and a first connecting lever 6 is connected in the left-right direction. Since the driver's cab support device for the tracked vehicle is constructed by providing two coupling levers 7 with the first coupling lever 6 tilted in the front-rear direction and the second coupling lever 7 tilted in the left-right direction, engine vibrations can be reduced. and vibrations transmitted from the roadbed while driving.
Furthermore, it is possible to prevent vibrations transmitted from the work equipment during work from being transmitted from the vehicle body to the driver's cab 2a, and the driver's cab 2a can be stably suspended without tilting back and forth or from side to side.

Therefore, the driver's cab 2 installed on the driver's cab 2a and the driving device installed on the driver's cab 2a and located in the driver's cab 2 are also free from vibration and tilting, thereby improving riding comfort.

Furthermore, according to the present invention, the first coupling lever 6 is inclined in the front-rear direction, and the second coupling lever 7 is inclined in the left-right direction, so that both coupling levers 6.
The vertical installation of 7 requires less space, and even though the first and second coupling levers 6.7 of sufficient length are installed, the distance between the vehicle body and the driver's cab 2a can be reduced. The influence of attachment of the first and second coupling levers 6.7 on the ground clearance of the driver's cab 2a can be reduced.

[Brief explanation of the drawing]

The drawings show an embodiment of the main parts of the present invention, and Fig. 1 is a side view, Fig. 2 is a plan view of the lower part, Fig. 3 is a front view, Fig. 4 is a sectional view of the air spring, and Fig. 5 is a sectional view of the air spring. The figure is a sectional view of the first coupling lever, and FIG. 6 is a sectional view of the end of the second coupling lever. 1 is a frame, 2a is a cab, 3 is an air spring, 6.7.
8 is the coupling lever.

Claims (1)

[Scope of utility model registration request] The driver's cab 2a is suspended from the vehicle body side by an air spring 3, and a first connecting lever 6 is provided between the lower part of the driver's cab 2a and the vehicle body to connect them in the front-rear direction, and a first connecting lever 6 is connected in the left-right direction. A driver's cab support device for a tracked vehicle, characterized in that two coupling levers 7 are provided, with the first coupling lever 6 tilting in the front-rear direction and the second coupling lever 7 tilting in the left-right direction.