| 摘要 |
PROBLEM TO BE SOLVED: To provide a synchro key capable of promoting optimization or smoothening of operation of a synchronizer, and useful for making operation feeling of a transmission better.SOLUTION: A synchro key 1 is assembled into a synchronizer C including a clutch hub 3 and a sleeve 6 externally fitted to the clutch hub 3 in a spline fitting state and moved in a thrust direction. In a thrust direction view of the sleeve 6, an outer surface 11a of a projection part 11 pressed by a pressing surface 61 for a synchro key provided in the sleeve 6 is a projection curve surface having roundness of a curvature radius Ra smaller than a curvature radius Rb of the pressing surface 61 for a synchro key.SELECTED DRAWING: Figure 3 |
