Continuously variable hydro-mechanical transmission

Abstract

A transmission for use with a power source and a load includes a primary sun gear adapted to be coupled to the power source, a hydrostatic power unit including a pump coupled to a motor, a ring gear driven by the motor, a secondary sun gear coupled to a first output shaft, a compound planetary gear carrier coupled to a second output shaft and a compound planetary gear carried by the compound planetary gear carrier and in engagement with the ring gear and the secondary sun gear. The first output shaft and the second output shaft are adapted to be selectively coupled to the load.

1 - 21 . (canceled)  
   
   
       22 . A transmission for use with a power source and a load, the transmission comprising: 
 a primary sun gear adapted to be selectively coupled to the power source;    a hydrostatic power unit including a pump coupled to a motor, the pump being adapted to be driven by the power source;    a ring gear adapted to be selectively driven by the motor;    a secondary sun gear coupled to a first output shaft;    a compound planetary gear carrier coupled to a second output shaft; and    a compound planetary gear carried by the compound planetary gear carrier and in engagement with the ring gear and the secondary sun gear,    wherein the first output shaft and the second output shaft are adapted to be selectively coupled to the load.    
   
   
       23 . The transmission of  claim 22  including: 
 a load shaft adapted to be coupled to the load; and    a plurality of range gear sets selectively coupled between the load shaft and one of the first or second output shafts.    
   
   
       24 . The transmission of  claim 22  including: 
 a load shaft adapted to be coupled to the load;    an intermediate shaft; and    a plurality of range gear sets coupled to the intermediate shaft and selectively coupled between the load shaft and at least one of the first output shaft and the second output shaft.    
   
   
       25 - 26 . (canceled)  
   
   
       27 . The transmission of  claim 24 , wherein at least two of the range gear sets are engaged for a selected speed.  
   
   
       28 . A work vehicle representing a load in the form of motive and output power, the vehicle comprising: 
 a power source; and    a transmission including a primary sun gear selectively coupled to the power source; a hydrostatic power unit including a pump coupled to a motor, the pump being adapted to be driven by the power source; a ring gear adapted to be selectively driven by the motor; a secondary sun gear coupled to a first output shaft; a compound planetary gear carrier coupled to a second output shaft; and a compound planetary gear carried by the compound planetary gear carrier and in engagement with the ring gear and the secondary sun gear, wherein the first output shaft and the second output shaft are selectively coupled to the load.    
   
   
       29 . The work vehicle of  claim 28  including a selectively actuatable reverse power train.  
   
   
       30 . The work vehicle of  claim 29 , wherein the reverse power train includes at least one clutch for selectively actuating the reverse power train.  
   
   
       31 - 32 . (canceled)  
   
   
       33 . The work vehicle of  claim 28  including a load shaft adapted to be coupled to the load; an intermediate shaft; and a plurality of range gear sets coupled to the intermediate shaft and selectively coupled between the load shaft and at least one of the first output shaft and the second output shaft.  
   
   
       34 - 36 . (canceled)