Method of controlling speed changing operation for construction

192 clutches and power-stop control – Vortex-flow drive and clutch – With brake

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Details

192 355, 192 357, 192 0092, 3644241, 180 648, F16D 2102, B60K 4102

Patent

active

051039486

ABSTRACT:
A method of controlling a speed changing operation wherein the method is preferably employable for a caterpillar drive type construction machine including a direct transmission is disclosed. When a shift-up speed changing operation is to be performed, the method is practiced by way of the steps, i.e., a step of releasing leftward and rightward steering clutches from the operatively engaged state thereof, a step of increasing an engine speed, a step of releasing a main clutch from the operatively engaged state thereof, a step of releasing the dog clutch which has selected the present speed stage from the meshing engagement thereof, a step of bringing the main clutch in the operatively engaged state, a step of detecting the rotational speed of an output shaft in the transmission, a step of setting a target engine speed for realizing synchronous meshing engagement of a dog clutch for a next speed stage based on the rotational speed of the output shaft and the number of gear teeth to be brought in meshing engagement in the transmission when it is assumed that the next speed stage has been selected, a step of rotating the engine at the target engine speed, a step of bringing the dog clutch for the next speed stage in the operatively engaged state thereof, a step of bringing the leftward and rightward steering clutches in the operatively engaged state, and a step of rotating the engine at the engine speed which has been designates by actuating a throttle lever. With such construction, the method of the present invention assures that the shift-up speed changing operation can smoothly be performed without any necessity for interrupting movement of the caterpillar drive type construction machine.

REFERENCES:
patent: 3348644 (1967-10-01), Hilpert
patent: 3438469 (1969-04-01), Hilpert
patent: 3645366 (1972-02-01), Numazawa et al.
patent: 4324322 (1982-04-01), Sideud
patent: 4677880 (1987-07-01), Hattori et al.
patent: 4732246 (1988-03-01), Tateno et al.
patent: 4768636 (1988-09-01), Ito et al.
patent: 4785917 (1988-11-01), Tateno et al.
patent: 4792012 (1988-12-01), Morisawa et al.

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