Two-speed gear transmission

Details Two-speed gear transmission Two-speed gear transmission

F - Mech Eng,Light,Heat,Weapons

16

H

74/129

F16H 3/44 (2006.01)

Patent

CA 1071897

IMPROVED TWO-SPEED GEAR TRANSMISSION ABSTRACT OF THE DISCLOSURE A two-speed planetary gear transmission including direct drive connectable by a clutch wherein the input and output shafts rotate together and a second gear drive namely overdrive or underdrive wherein one of the sun or ring gears are held stationary by a brake relative to the casing. A spring which causes engage- ment of the direct drive clutch exerts its greatest force when the clutch is engaged, it exerts a relatively high biasing force upon initial disengagement of the clutch under the action of an actuating device such as a servo-motor, to thereby assure initially a signif- icantly reduced level of torque transfer at the brake, to thereby provide a smooth gear transition. The spring force then becomes significantly less when the brake is engaged. The forces exerted by the spring in direct drive and by the actuating device in second gear drive bypass rotary bearings which are in motion at such times.

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