192 clutches and power-stop control – Vortex-flow drive and clutch – With brake
Patent
1992-05-05
1993-11-30
Braun, Leslie A.
192 clutches and power-stop control
Vortex-flow drive and clutch
With brake
192 0075, 192 0096, 192103F, 180197, 36442601, F16D 4304, F16D 4328
Patent
active
052657051
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
This invention relates to a method of preventing a wheel loader from slipping, and more particularly to a method of preventing a wheel loader from slipping whereby the amount of slip of the loader in operation can be reduced.
BACKGROUND ART OF THE INVENTION
A prior art method of preventing a wheel loader from slipping is disclosed in the Japanese Laid-Open Patent Application No. SHO 64-4013. According to this prior art method of preventing the loader from slipping, a slip controlling device conducts processing of information on the basis of an input signal from a detector for detecting the load on an implement, and outputs a command signal for controlling the implement and a command signal for controlling the force of traction upon generation of slip of the vehicle so that the output signals permit the implement to effect compensating operation so as to reduce the loading thereon.
Besides the above-mentioned prior art method, in general, methods of controlling the output of the engine or controlling the brake when the wheel loader is slipping could be envisaged.
Out of the above-mentioned prior art methods, according to the former method, since the load on the implement is automatically reduced when the vehicle is slipping, that is, no-load condition is reached, so that a situation against the intention of the operator will occur if this method is effected.
Further, according to the latter method in case wheel loader slips during excavating operation, even if the operator detects the occurrence of slip and takes procedures to control it, it takes about 0.5 to 1.0 second until the slip is restrained. Therefore, in case of the method of controlling the output of the engine, the response is slow, and in case of the method of controlling the brake, the braking action tends to be delayed, so that both the methods have been ineffective.
SUMMARY OF THE INVENTION
The present invention has been made in view of the above-mentioned circumstances in the prior art, and has for its object to provide a method of preventing a wheel loader from slipping so that the amount of slip of the loader during excavating operation using it can be reduced, and also the decline in the operational efficiency due to the slip can be prevented.
To achieve the above-mentioned object, according to one aspect of the present invention, there is provided a method of preventing a wheel loader from slipping comprising the steps of detecting the occurrence of slip in accordance with the difference in the number of revolutions between a pair of left and right drive wheels and the change thereof, and controlling the clutch pressure so that the clutch is put in half-clutch condition upon detection of the occurrence of slip.
Further, according to the present invention, there is provided a method of preventing a wheel loader from slipping as set forth in the above-mentioned aspect, wherein said detection of slip is conducted when the force of traction exceeds a preset value.
Still further, according to the present invention, there is provided a method of preventing a wheel loader from slipping as set forth in the above-mentioned aspect, wherein said clutch pressure control is released when the implement is in operation and the fluid pressure in the buttom chamber of a boom cylinder is 100 kg/cm.sup.2 or over, or when the number of revolutions of the engine is 1,300 r.p.m or under.
Thus, according to the method of preventing a wheel loader from slipping, upon detection of the occurrence of slip from the difference in the number of revolutions between the pair of left and right drive wheels, the clutch pressure is controlled immediately so as to eliminate the slipping condition without having to reduce the load on the implement.
Further, the clutch pressure control is released by conducting such operation of the implement as the lip is eliminated when the implement is in operation, thereby returning to the normal operating condition quickly.
An effect obtainable by the present invention is that upon generation of
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Mori Masayuki
Takasugi Shinji
Braun Leslie A.
Kabushiki Kaisha Komatsu Seisakusho
Kananen Ronald P.
Pitts Andrea
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