Boots – shoes – and leggings
Patent
1993-10-07
1997-04-15
Teska, Kevin J.
Boots, shoes, and leggings
340686, 414699, 172 3, 172 7, 180197, B60K 2816
Patent
active
056216432
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a dozing system for a bulldozer. More particularly, the invention relates to such techniques in dozing operation carried out with a bulldozer as control of loads which are applied to a blade by excavating and moving earth and ground leveling control by keeping the position of a cutting edge of the blade constant with respect to the ground.
BACKGROUND ART
Dozing operation by the use of a bulldozer has been previously performed in such a manner that: the operator who drives a bulldozer manually operates a blade to be lifted or lowered so as to keep loads applied to the blade by excavating and moving earth constant while eliminating running slip of a vehicle body (i.e., shoe slip) for the sake of efficiency on dozing operation and so as to level the ground with the position of a cutting edge of the blade being kept constant with respect to the ground.
However, the above-described manual operation for lifting or lowering a blade so as to keep loads on tile blade constant while eliminating shoe slip for the sake of efficiency on dozing operation and so as to level the ground with the position of a cutting edge of the blade being kept constant with respect to the ground presents the following disadvantages. Even if the operator is very skillful, he has to carry out lifting/lowering operation a number of times so that he will get significantly exhausted. Another disadvantage is that because the operation is very complicated, the unskilled operators, as a matter of course, will be significantly exhausted with fatigue, and the operation itself will be found as quite difficult to be carried out.
The prime object of the invention is therefore to provide a dozing system for a bulldozer with which dozing can be easily carried out by a simple operation, without causing a great deal of fatigue to the operator so that the foregoing problems can be overcome.
DISCLOSURE OF THE INVENTION
in order to accomplish the above object, a dozing system for a bulldozer according to the invention comprises: body; force of the vehicle body; detected by the actual tractive force detector means with a target tractive force which has been preset, and controlling a blade such that the blade is lifted or lowered so as to make the actual tractive force coincident with the target tractive force when the running slip has not been detected by the running slip detector means and such that the blade is lifted so as to eliminate the running slip when the running slip has been detected by the running slip detector means.
According to the above system, when the running slip of the vehicle body is not detected by the running slip detector means, the comparison controller means controls the blade to be lifted or lowered in order to make an actual tractive force detected by the actual tractive force detector means coincident with a target tractive force preset by e.g., a dial, whereby loads applied to the blade by excavating and moving earth can be maintained constant. On the other hand, when the running slip is detected by the running slip detector means, the comparison controller means controls the blade to be lifted in order to reduce loads applied to the blade by excavating and moving earth, thereby eliminating the running slip.
Since the blade is automatically lifted or lowered such that loads applied to the blade by excavating and moving earth becomes coincident with the target tractive force while eliminating running slip so that the loads can be maintained constant, dozing operation no longer causes a great deal of fatigue to the operator and can be easily carried out by a simple operation. In addition, not only can the durability of the crawler belts be increased thanks to elimination of the running slip, but also high efficiency can be achieved since dozing operation is carried out with constant loads.
The comparison controller means may be arranged to perform lifting or lowering control of the blade such that the position of the cutting edge of the blade with respect to the ground is so
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Matsushita Shigenori
Nakagami Hiroshi
Yamamoto Shigeru
Komatsu Ltd.
Phan Thai
Teska Kevin J.
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