Variable speed gearbox

Abstract

A variable speed gearbox includes: an electric driving device which generates a rotational driving force; and a transmission device which changes the speed of the rotational driving force and transmits the changed rotation driving force to a driving target. The transmission device includes: a sun gear; a sun gear shaft; a planetary gear which meshes with the sun gear; an internal gear which meshes with the planetary gear; a planetary gear carrier which has a planetary gear carrier shaft; and an internal gear carrier which has an internal gear carrier shaft. The electric driving device includes: a constant-speed motor having a constant-speed rotor; and a variable-speed motor having a variable-speed rotor. The internal gear carrier includes a clutch mechanism including: a moving portion; a drive portion; a fixed portion; and an engaging portion which engages the moving portion and the fixed portion.

1 . A variable speed gearbox comprising:
 an electric driving device which generates a rotational driving force; and   a transmission device which changes the speed of the rotational driving force generated by the electric driving device and transmits the changed rotation driving force to a driving target, wherein   the transmission device comprises
 a sun gear which rotates about an axis, 
 a sun gear shaft which is fixed to the sun gear and extends in an axial direction around the axis, 
 a planetary gear which meshes with the sun gear, revolves around the axis and rotates about its own center line, 
 an internal gear which has a plurality of teeth aligned annularly around the axis and meshes with the planetary gear, 
 a planetary gear carrier which has a planetary gear carrier shaft extending in the axial direction around the axis and supports the planetary gear to revolve around the axis and to be rotatable around a center line of the planetary gear itself, and 
 an internal gear carrier which has an internal gear carrier shaft extending in the axial direction around the axis and supports the internal gear to be rotatable about the axis, 
   the sun gear shaft forms an output shaft connected to the driving target, the internal gear carrier shaft forms a constant-speed input shaft, and the planetary gear carrier shaft forms a variable-speed input shaft,   the electric driving device comprises
 a constant-speed motor having a constant-speed rotor which rotates the constant speed input shaft of the transmission device, and 
 a variable-speed motor having a variable-speed rotor connected to the variable-speed input shaft of the transmission device, 
   the internal gear carrier includes a clutch mechanism which connects a cylindrical portion connected to the internal gear with the internal gear carrier shaft, and   the clutch mechanism comprises
 a moving portion which is connected to one of the cylindrical portion and the internal gear carrier shaft to be movable in the axial direction, 
 a drive portion which drives the moving portion in the axial direction, 
 a fixed portion which is fixed to the other one of the cylindrical portion and the internal gear carrier shaft, and 
 an engaging portion which engages the moving portion and the fixed portion by moving the moving portion in the axial direction. 
   
     
     
         2 . The variable speed gearbox according to  claim 1 , wherein the drive portion comprises
 a disk which is fixed to the other one of the cylindrical portion and the internal gear carrier shaft to face the moving portion in the axial direction and forms an oil supply space between the disk and the moving portion,   an oil supply portion which supplies oil into the oil supply space, and   an oil discharge portion which discharges the oil from the oil supply space.   
     
     
         3 . The variable speed gearbox according to  claim 2 , wherein
 the oil supply portion includes an oil supply path which is formed in at least one of the fixed portion and the disk, and   a nozzle which supplies the oil supplied to the oil supply path into the oil supply space.   
     
     
         4 . The variable speed gearbox according to  claim 2 , wherein
 the oil supply space includes a first oil supply space which is formed between the moving portion and the disk, and   a second oil supply space which communicates with the first oil supply space and is formed inside the constant-speed rotor, and the oil supply portion supplies the oil into the second oil supply space.   
     
     
         5 . The variable speed gearbox according to  claim 1 , wherein
 the variable-speed rotor is formed in a cylindrical shape centered on the axis, and   the constant-speed input shaft is inserted through a shaft insertion hole which passes therethrough in the axial direction.   
     
     
         6 . The variable speed gearbox according to any one of  claim 2 , wherein
 the variable-speed rotor is formed in a cylindrical shape centered on the axis, and   the constant-speed input shaft is inserted through a shaft insertion hole which passes therethrough in the axial direction.   
     
     
         7 . The variable speed gearbox according to any one of  claim 3 , wherein
 the variable-speed rotor is formed in a cylindrical shape centered on the axis, and   the constant-speed input shaft is inserted through a shaft insertion hole which passes therethrough in the axial direction.   
     
     
         8 . The variable speed gearbox according to any one of  claim 4 , wherein
 the variable-speed rotor is formed in a cylindrical shape centered on the axis, and   the constant-speed input shaft is inserted through a shaft insertion hole which passes therethrough in the axial direction.