| 摘要 |
A machine tool transmission for use in changing the torque and speed of a spindle rotatingly driven by an electric motor comprises a transmission casing, input and output shafts mounted on the transmission casing in a spaced-apart, parallel relationship for rotation at different speeds from each other, a movable gear axially displaceably fitted to the input shaft for sliding movement between first and second shift positions, first and second stationary gears fixedly secured to the output shaft for rotation in unison therewith, and a gear shifting device for causing the movable gear to be shifted either into the first shift position so that the movable gear can be meshed with the first stationary gear or the second shift position so that the movable gear can be in meshing engagement with the second stationary gear. The gear shifting device includes first and second mutually opposed cylinder sections provided on the top of the transmission casing, a cylinder rod slidably received in the first and second cylinder housing sections at its opposite ends and a shift yoke attached to the cylinder rod at its proximal end and engaging with the movable gear at its distal end. |
