Gear switch drum arrangement and method for switching gears for automatic transmission unit, comprising rotary and translatory movable drum

摘要

The arrangement for switching gears in an automatic transmission unit is equipped with a drum (1) connected to at least one selector fork (2) for selecting and switching a gear. The drum (1) can be rotated as well as translatory moved, transferring the motion to the appropriate fork (2) by a cam (4) guided in one of several grooves arranged along the drum (1). Each selector fork (2) forms a unit with one straight path and a second path with a deviation.