초록 ▼

A gear drive unit of the type including a twin-shaft selective output mechanism is disclosed wherein first and second overrunning clutch mechanisms constituting the twin-shaft selective output mechanism are each composed of a spring-receiving chamber, a coiled spring and a driven gear. The first ove

A gear drive unit of the type including a twin-shaft selective output mechanism is disclosed wherein first and second overrunning clutch mechanisms constituting the twin-shaft selective output mechanism are each composed of a spring-receiving chamber, a coiled spring and a driven gear. The first overrunning clutch mechanism, in response to rotation of a worm wheel in a forward direction, radially expands a first coiled spring to connect the worm wheel and a first driven gear, thereby connecting the worm wheel and a first driven gear to transmit the forward rotation of the worm wheel to the driven gear. Similarly, the second overrunning clutch mechanism is responsive to rotation of the worm wheel in the reverse direction to enlarge the diameter of a second coiled spring, thereby connecting the worm wheel and a second driven gear to transmit the reverse rotation of the worm wheel to the second driven gear. The twin-shaft selective output mechanism using such coiled springs is simple in construction and easy to manufacture.

대표청구항 ▼

A gear drive unit, comprising: a motor rotatable in forward and reverse directions and having an output shaft; a worm fixedly mounted on said output shaft of said motor; a worm wheel having gear teeth meshed with said worm; a twin-shaft selective output mechanism including first and second driven ge

A gear drive unit, comprising: a motor rotatable in forward and reverse directions and having an output shaft; a worm fixedly mounted on said output shaft of said motor; a worm wheel having gear teeth meshed with said worm; a twin-shaft selective output mechanism including first and second driven gears, and first and second overrunning clutch mechanisms capable of selectively driving one of said first and second driven gears depending on the direction of rotation of said worm wheel; first and second reduction gears held in mesh with said first and second driven gears, respectively, of said twin-shaft selective output mechanism; first and second output shafts connected with said first and second reduction gears, respectively, and adapted to be connected with first and second driven members; and wherein said first and second overrunning clutch mechanisms of said twin-shaft selective output mechanism are disposed inside said worm wheel and on respectively opposite sides of said gear teeth of said worm wheel.