| 摘要 |
839,021. Clutches; change-speed gears. GETRAG GETRIEBEUND ZAHNRADFABRIK G.m.b.H. May 24, 1957 [May 28, 1956; Aug. 14, 1956], No. 16561/57. Class 80 (2). In a change-speed gear having locking members 3, 4 moved radially by an axially-shiftable member 1, an intermediate axially-movable member 15 holds the locking members 3, 4 under the periphery of the gear shaft 2 when neither member 3 nor 4 is engaged, and on radial movement of one locking member into the engaging position presses the other locking member radially inwards. In a four-speed gear having gears 29, 30 rigid with the input shaft 2 and gears 25, 26 rotatable thereon, the gears 25, 26 are selectively engaged with the shaft 2 by balls 3, 4 moved radially by a selector shaft 1. An intermediate member 15 which may comprise a series of axially-movable pins, as shown, or an axially movable sleeve beveiled at the ends, holds the balls 3, 4 below the surface of the shaft 2 when neither gear is engaged, and presses one series of balls radially inwards out of engagement when the other set of balls is moved radially outwards by the selector shaft 1 to engage a gear. Axial movement of the shaft 1 is provided by stationary magnets 38, 39. The pins 15 may be surrounded with bearing-rings 43 and rollers 44 to provide a bearing for the gears 25, 26. A similar arrangement is provided on the output shaft 2<SP>1</SP>. The ball pockets may be made circumferentially as large as practicable to provide easy and rapid engagement of the balls. |
