Seal assembly for hydraulic pump output shaft

Abstract

A seal assembly for a hydraulic pump is provided. The assembly includes a spacer ring, a rotor having a first side and a second side, the first side engaging the spacer ring, and a spring-loaded face seal having a face in contact with the rotor second side, where the face seal is configured to supply a force against the rotor sufficient to cause the face seal face to sealingly engage the rotor second side.

1 . A seal assembly for a hydraulic pump, the assembly comprising: 
 a spacer ring;    a rotor having a first side and a second side, the first side engaging the spacer ring; and    a spring-loaded face seal having a face in contact with the rotor second side, the face seal configured to supply a force against the rotor sufficient to cause the face seal face to sealingly engage the rotor second side.    
   
   
       2 . The seal assembly of  claim 1 , wherein the rotor has an inner surface and the assembly further comprises an O-ring contacting the rotor inner surface.  
   
   
       3 . The seal assembly of  claim 1 , wherein the spacer ring has an end, and the assembly further comprises: 
 a groove formed in the spacer ring end; and    a flange formed on the rotor first side, the flange disposed within the groove.    
   
   
       4 . The seal assembly of  claim 1 , wherein the spacer ring has an end and the assembly further comprises: 
 a groove formed in the rotor first side; and    a flange formed on the spacer ring end and disposed within the groove.    
   
   
       5 . The seal assembly of  claim 1 , wherein the spacer ring has an end, and the assembly further comprises: 
 a first and a second groove each formed in the spacer ring end; and    a first and a second flange each formed in the rotor first side and each disposed within the first and second grooves, respectively.    
   
   
       6 . The seal assembly of  claim 1 , wherein the face seal comprises: 
 a seal case;    a stator disposed within the seal case, the stator having the face; and    a spring disposed within the seal case, the spring configured to supply the force against the rotor to cause the face seal face to sealingly engage the rotor second side.    
   
   
       7 . The seal assembly of  claim 1 , further comprising a bearing assembly coupled to the spacer ring.  
   
   
       8 . The seal assembly of  claim 1 , further comprising a shaft to which the spacer ring and rotor are mounted.  
   
   
       9 . The seal assembly of  claim 8 , wherein the shaft is configured to be coupled to a gearbox.  
   
   
       10 . A hydraulic pump, comprising: 
 a housing;    a shaft rotationally mounted at least partially within the housing;    a spacer ring mounted to the shaft;    a rotor mounted to the shaft and having a first side and a second side, the rotor first side engaging the spacer ring; and    a spring-loaded face seal coupled to the housing and having a face in contact with the rotor second side, the face seal configured to supply a force against the rotor sufficient to cause the face seal face to sealingly engage the rotor second side.    
   
   
       11 . The pump of  claim 10 , further comprising: 
 an O-ring disposed between the rotor and the shaft.    
   
   
       12 . The pump of  claim 10 , wherein the spacer ring has an end, and the pump further comprises: 
 a groove formed in the spacer ring end; and    a flange formed on the rotor first side, the flange disposed within the groove.    
   
   
       13 . The pump of  claim 10 , wherein the spacer ring has an end and the pump further comprises: 
 a groove formed in the rotor first side; and    a flange formed on the spacer ring end and disposed within the groove.    
   
   
       14 . The pump of  claim 10 , wherein the spacer ring has an end, and the pump further comprises: 
 a first and a second groove each formed in the spacer ring end; and    a first and a second flange each formed on the rotor first side and each disposed within the first and second grooves, respectively.    
   
   
       15 . The pump of  claim 10 , wherein the face seal comprises: 
 a seal case;    a stator disposed within the seal case, the stator having the face; and    a spring disposed within the seal case, the spring is configured to supply the force against the rotor to cause the face seal face to sealingly engage the rotor second side.    
   
   
       16 . The pump of  claim 10 , further comprising a bearing assembly disposed concentrically around the shaft, wherein the spacer ring is disposed between the bearing assembly and the shaft.  
   
   
       17 . The pump of  claim 10 , wherein the shaft is configured to couple to a gearbox.  
   
   
       18 . A seal assembly for a hydraulic pump, the system comprising: 
 a spacer ring;    a rotor having a first side and a second side, the first side engaging the spacer ring;    a stator having a face in contact with the rotor second side;    a seal case within which the stator is disposed; and    a spring disposed within the seal case, the spring configured to supply a force against the rotor that is sufficient to cause the stator face to sealingly engage the rotor second side.    
   
   
       19 . The seal assembly of  claim 18 , wherein the spacer ring has an end, and the assembly further comprises: 
 a groove formed in the spacer ring end; and    a flange formed on the rotor first side, the flange disposed within the groove.    
   
   
       20 . The seal assembly of  claim 18 , wherein the spacer ring has an end and the assembly further comprises: 
 a groove formed in the rotor first side; and    a flange formed on the spacer ring end and disposed within the groove.