Patent ID: 6880422

Claim:
A shift actuator for a transmission, said shift actuator actuating, in a direction of shift, a shift lever for operating a synchronizing device of the transmission, the synchronizing device having a synchronizing position, said shift actuator comprising: a first electromagnetic solenoid and a second electromagnetic solenoid for actuating an operation member coupled to said shift lever in directions opposite to each other, each of said first electromagnetic solenoid and said second electromagnetic solenoid comprising a casing, a fixed iron core disposed in said casing, a moving iron core able to approach, and separate away from, said fixed iron core, an operation rod mounted on said moving iron core for movement therewith to move the operation member, and an electromagnetic coil arranged between said casing and said fixed and moving iron cores, wherein: said fixed iron core and said moving iron core have opposing surfaces, the opposing surface of one of said fixed iron core and said moving iron core has a stepped protuberance formed thereon, the opposing surface of the other of said fixed iron core and said moving iron core has a stepped recess formed therein to correspond to said stepped protuberance, and an edge of said stepped protuberance and an edge of said stepped recess are closest to each other at a position corresponding to the synchronizing position of the synchronizing device.