Drive system with flow brake

Machine element or mechanism – Gearing – With fluid drive

Patent

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Details

74862, 192 4B, 192 9, 192 009, F16H 4704, B60K 4128

Patent

active

046305076

ABSTRACT:
A vehicle drive system includes a torque converter interconnecting an engine and a speed change gear and a flow brake is drivingly positioned between the torque converter and the speed change gear. A rotor of the flow brake is driven from a drive train which includes a torque converter turbine and the primary side of the speed change gear. During a braking cycle, the speed change gear is downshifted by one or more steps to increase the rotational speed of the flow brake rotor and generate a high braking moment. Because of high rotor speed, the flow brake is relatively small. The torque converter includes a bypass clutch which is disengaged during braking to permit negative slip in the torque converter and prevent excessive engine speed. The total braking load is distributed over the speed change gear, the flow brake, the torque converter and the engine. In addition, an engine brake and vehicle mechanical friction brakes may be employed. Preferably the flow brake actuation, speed change gear shifting, bypass clutch disengagement and engine brake actuation are under the automatic control of a programed controller.

REFERENCES:
patent: 2978928 (1961-04-01), Tuck et al.
patent: 3863739 (1975-02-01), Schaefer et al.
patent: 3931870 (1976-01-01), Memmer
patent: 4314487 (1982-02-01), Ahlen
ATZ Automobiltechnische Zeitschrift, 75 (1973), No. 12, pp. 442-447.

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