| 摘要 |
1502346 Positive clutches; clutch-brake combinations; change speed gears ZAHNRADFABRIK FRIEDRICHSHAFEN AG 25 April 1975 [26 April 1974] 17238/75 Headings F2C F2D and F2L In a friction synchronized positive clutch or brake (Fig. 7, not shown) for a change speed gear wherein axial engaging movement of a two-part sleeve 4, 11 is baulked until synchronism occurs by teeth on the sleeve 11 abutting teeth on a synchronizing ring 5, the initial axial movement of the sleeve 4, 11 is transmitted to the synchronizing ring 5 by radially resilient axially extending spring tongues 10 fast with a rim 6 riveted to the sleeve 11 (or synchronizing ring 5) and engaging a groove 21 in the synchronizing ring 5 (or sleeve 11). As shown in a double positive clutch for selectively connecting gears 1, 2 to a shaft 3, a pair of rims 6 having spring tongues 10 are riveted to the clutch sleeve 11. The spring tongues 10 engage, with lost motion, between radial projections (7, 8) of the synchronizing ring 5 so that when the latter frictionally engages the gear 1 or 2 the ring 5 rotates relative to the sleeve 11 to a position in which its teeth prevent further axial movement of the inner part 4 of the clutch sleeve. When synchronism is attained bevelled ends of the clutch teeth on the sleeve 4 return the synchronizing ring 5 to a position in which the clutch teeth on the sleeve 4 can pass through the teeth on the ring 5 into engagement with teeth on the gear 1 or 2. During the further clutch engaging movement of the clutch sleeve 4, 11, the spring tongues 10 ride out of the grooves 21. In Figs. 4-6 (not shown) the spring tongues press radially outwardly into internal grooves of the synchronizing rings. In Fig. 7 (not shown) the spring tongue rims (76) are riveted to the synchronizing rings (75) and the spring tongues (70) are biased radially outwardly into engagement with grooves (77) in an axially slidable sleeve (71). The sleeve (71) additionally forms the ring gear of a sun-ring planet train and movement of the sleeve (71) in one direction engages a clutch connecting the sleeve (71) to an output planet carrier (72) for direct drive, whilst movement of the sleeve (71) in the opposite direction engages a positive brake which holds the sleeve (71) for reduced ratio. |
