Slipping clutch creeper

Details Slipping clutch creeper Slipping clutch creeper

1992-12-17

1994-08-02

Braun, Leslie A.

Machine element or mechanism

Gearing

Interchangeably locked

3644241, F16H 5946, B60K 4102

Patent

active

053337093

ABSTRACT:
In a powershift transmission having electro-hydraulic clutches for selectively connecting an input shaft in driving relationship with an output at any one of a plurality of output to input shaft speed ratios, creeper gear speeds, less than those obtained by selecting the lowest output to input shaft speed ratio, are obtained by placing the transmission in the lowest gear (forward or reverse) and controlling the output shaft speed by automatically controlling clutch slippage. Any one of a plurality of forward or reverse creeper gear speeds may be selected by operation of a gearshift lever. The speeds of the input and output shafts are sensed and a microprocessor responds to the sensed shaft speeds and the selected creeper gear speed to control slipping of the clutch. In one embodiment the output shaft speed is controlled to a specific speed value independent of the input shaft speed. In a second embodiment, the output shaft speed is controlled to obtain a specific ratio of output to input shaft speed.

REFERENCES:
patent: 4513638 (1985-04-01), Nishikawa et al.
patent: 4529072 (1985-07-01), Oguma et al.
patent: 4598611 (1986-07-01), Frank
patent: 4629045 (1986-12-01), Kasai et al.
patent: 5012690 (1991-05-01), Bulgrien
patent: 5074392 (1991-12-01), Hasegawa et al.
patent: 5083648 (1992-01-01), Bulgrien
patent: 5101943 (1992-04-01), Bulgrien
patent: 5105675 (1992-04-01), Langford et al.

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