Fluid driven drilling motor

Abstract

A motor assembly is disclosed that includes a vane motor coupled to an output shaft by a drive section. The drive section includes hammers that engage the output shaft to provide improved torque.

What is claimed is: 
     
       1. A motor assembly, comprising:
 a casing; 
 a vane motor disposed within the casing; 
 wherein the vane motor comprises: 
 a shaft having a shaft passage therethrough; 
 a motor assembly comprising a plurality of vanes defining a plurality of chambers, the motor assembly disposed around the shaft; 
 an orifice component disposed in the shaft passage and in fluid connectivity with the shaft passage that regulates fluid distribution between the shaft passage and the plurality of chambers; 
 a drive section coupled to the vane motor; and 
 an output shaft coupled to the drive section; 
 wherein the drive section comprises: 
 a drive hammer coupled to the vane motor that engages the output shaft to provide rotation thereto; and 
 wherein the drive hammer comprises two lobes that strike two corresponding tabs on the output shaft sequentially per revolution to provide two impulses per revolution to generate the provided rotation thereto; 
 wherein the output shaft comprises an output shaft passage therethrough in fluid connectivity with the shaft passage; and 
 wherein the orifice component comprises a body comprising a passage within the orifice component that regulates fluid distribution between the shaft passage and the plurality of chambers. 
 
     
     
       2. The motor assembly of  claim 1 , wherein the drive section further comprises:
 a housing; and 
 pins attached to the housing that contact the drive hammer such that the drive hammer can pivot about one pin of the pins to change position within the housing. 
 
     
     
       3. The motor assembly of  claim 2 , wherein the change of position of the drive hammer causes the drive hammer to disengage from the drive section. 
     
     
       4. The motor assembly of  claim 2 , wherein the drive hammer includes a slot that allows for rotational contact with a pin of the pins attached to the housing, and wherein the drive hammer further includes a trough that allows for sliding contact with a second pin of the pins attached to the housing. 
     
     
       5. The motor assembly of  claim 4 , wherein the output shaft comprises:
 a tab for releasably engaging the drive hammer. 
 
     
     
       6. The motor assembly of  claim 5 , wherein the corresponding tabs are released from the drive section when a predetermined amount of torque is applied from the hammer to the drive section. 
     
     
       7. The motor assembly of  claim 4 , wherein the two lobes strike the two corresponding tabs in a releasable manner. 
     
     
       8. The motor assembly of  claim 1 , wherein the two corresponding tabs releasably engage the drive hammer. 
     
     
       9. The motor assembly of  claim 1 , wherein the two lobes strike the two corresponding tabs in a releasable manner. 
     
     
       10. The motor assembly of  claim 9 , wherein the corresponding tabs are released from the drive section when a predetermined amount of torque is applied from the hammer to the drive section. 
     
     
       11. The drill assembly of  claim 1 , wherein the drive section further comprises:
 a housing; and 
 pins attached to the housing that contact the drive hammer such that the drive hammer can pivot about one pin of the pins to change position within the housing. 
 
     
     
       12. The motor assembly of  claim 11 , wherein the drive hammer includes a slot that allows for rotational contact with a pin of the pins attached to the housing, and wherein the drive hammer further includes a trough that allows for sliding contact with a second pin of the pins attached to the housing. 
     
     
       13. A drill assembly, comprising:
 a motor assembly comprising: 
 a casing; 
 a vane motor disposed within the casing; 
 wherein the vane motor comprises: 
 a shaft having a shaft passage therethrough; 
 a motor assembly comprising a plurality of vanes defining a plurality of chambers, the motor assembly disposed around the shaft; 
 an orifice component disposed in the shaft passage and in fluid connectivity with the shaft passage that regulates fluid distribution between the shaft passage and the plurality of chambers; 
 a drive section coupled to the vane motor; 
 an output shaft coupled to the drive section; and 
 a drill bit assembly coupled to the output shaft of the motor assembly; 
 wherein the drive section comprises: 
 a drive hammer coupled to the vane motor that engages the output shaft to provide rotation thereto; and 
 wherein the drive hammer comprises two lobes that strike two corresponding tabs on the output shaft sequentially per revolution to provide two impulses per revolution to generate the provided rotation thereto; 
 wherein the output shaft comprises an output shaft passage therethrough in fluid connectivity with the shaft passage; and 
 wherein the orifice component comprises a body comprising a passage within the orifice component that regulates fluid distribution between the shaft passage and the chambers. 
 
     
     
       14. The motor assembly of  claim 13 , wherein the change of position of the drive hammer causes the drive hammer to disengage from the drive section.