192 clutches and power-stop control – Clutch and brake
Patent
1980-03-10
1982-11-23
Bonck, Rodney H.
192 clutches and power-stop control
Clutch and brake
74786, 74787, 192 13R, 192 17A, F16D 6704, F16H 5710
Patent
active
043600921
ABSTRACT:
In first gear, a brake band prevents one gear of the planetary gearing of an automatic transmission from rotating. In second gear, a clutch causes this gear to rotate as a unit with the drive and driven shaft of the transmission. For an upshift under load, the clutch is engaged slowly, thereby decreasing the required brake torque. The brake force is therefore decreased at a corresponding rate. A switch having a movable contact is mounted so that the contact is moved in response to the reactive force created between the brake band and the gear box. This reactive force varies as a function of the brake force and also depends upon the direction of movement of the braked member. The switch is set to a threshold value which is substantially less than the brake force applied in first gear. At the freewheel point, that is the point at which the moment of the brake member changes direction, the brake force has been decreased sufficiently that the change in direction of the moment will cause the switch to pass the threshold value thereby generating a signal. This signal is processed to cause full disengagement of the brake. The switch will also pass the threshold value when, after complete disengagement of the brake, a change in direction of moment of the member occurs. At this point the brake is fully engaged in a downshift under load.
REFERENCES:
patent: 2409506 (1946-10-01), McFarland
patent: 3572177 (1971-03-01), Ishihara
patent: 4216852 (1980-08-01), Ushijima
patent: 4225029 (1980-09-01), Ushijima
Muller Alfred
Sauer Joseph
Bonck Rodney H.
Robert & Bosch GmbH
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