Automatic shift device for automated transmission for vehicle

An automatic shift device for an automated transmission for a vehicle, comprising:

• a rotation shaft configured to be in rotary engagement with and axially supported to be rotatable about an axis of one of an input shaft and an output shaft of the automated transmission;
• a clutch ring axially supported to be rotatable about the rotation shaft and configured to be in rotary engagement with the other one of the input shaft and the output shaft;
• a clutch hub fixed on the rotation shaft at a position adjacent to the clutch ring;
• a sleeve fitted to the clutch hub to be movable in an axial direction of the rotation shaft;
• a dog clutch portion protrudingly arranged on the clutch ring to protrude toward the sleeve, the dog clutch portion selectively meshing with the sleeve in response to movement of the sleeve in the axial direction;
• a shaft moving apparatus moving the sleeve in the axial direction for pushing the sleeve on the dog clutch portion;
• and
• a control portion controlling an operation of the shaft moving apparatus to selectively engage the sleeve and the dog clutch portion, wherein
• the sleeve includes plural lower teeth and plural higher teeth formed with teeth that are taller than the lower teeth, wherein
• the dog clutch portion includes same number of clutch front teeth as number of the higher teeth, the clutch front teeth formed at positions corresponding to the higher teeth and extending in the axial direction, the clutch front teeth formed with an outer diameter larger than an inner diameter of the higher teeth and smaller than an inner diameter of the lower teeth, wherein the dog clutch portion includes plural clutch rear teeth formed at positions between the clutch front teeth, the positions recessed from the clutch front teeth by a predetermined amount, and extending in the axial direction, wherein the dog clutch portion includes clutch tooth grooves formed between adjacently positioned clutch front tooth and the clutch rear tooth and between adjacently positioned clutch rear teeth, the clutch tooth grooves engageable with the sleeve, wherein
• the control portion includes a push force reduction control portion performing a push force reduction control reducing a push force of the sleeve that the shaft moving apparatus applies on the clutch rear teeth in response to a back and forth movement of the sleeve after the sleeve reaches an end surface of the clutch rear tooth, wherein the control portion includes a retry control portion performing a retry control that re-applies the push force of the sleeve in response to a predetermined retry condition after the push force reduction control is performed.