Axial piston motor

Abstract

On an inner surface of a housing, a nozzle for jetting operation oil is provided at a position opposite to an outer circumferential surface of a cylinder block. With this configuration, by spraying the operation oil from the nozzle to the outer circumferential surface of the cylinder block during rotation of the cylinder block, this operation oil can remove frictional heat generated by sliding between a piston and a cylinder, and seizure of the piston and seizure of the cylinder can be prevented.

1 - 6 . (canceled) 
     
     
         7 . An axial piston motor comprising:
 a housing;   a drive shaft which is mounted to the housing so as to be freely rotatable;   a cylinder block which is fixed to the drive shaft and has a plurality of cylinders arrayed in a circumferential direction;   a plurality of pistons which is fitted into the plurality of cylinders so as to be capable of freely advancing and retreating; and   a swash plate which supports the plurality of pistons by a tiltable surface relative to the drive shaft, wherein   on an inner surface of the housing, a nozzle for jetting operation oil is provided at a position opposite to an outer circumferential surface of the cylinder block.   
     
     
         8 . The axial piston motor according to  claim 7 , wherein
 the outer circumferential surface of the cylinder block has a high temperature zone which has a temperature higher than a predetermined threshold value during rotation of the cylinder block, and   the nozzle is opposed to the high temperature zone of the cylinder block.   
     
     
         9 . The axial piston motor according to  claim 8 , wherein
 as viewed in an axial direction of the drive shaft, the high temperature zone of the cylinder block is in a set range where a center angle is from +40° to −40° when a bottom dead center of the piston is selected as a standard.   
     
     
         10 . The axial piston motor according to  claim 9 , wherein
 as viewed in the axial direction of the drive shaft, the nozzle is disposed outside the position at which the piston is at the bottom dead center in a radial direction, and   as viewed in the axial direction of the drive shaft, a jetting direction of the nozzle intersects the set range of the cylinder block.   
     
     
         11 . The axial piston motor according to  claim 7 , further comprising
 a plug screwed to the housing in a penetrated state, wherein   the plug has the nozzle.   
     
     
         12 . The axial piston motor according to  claim 7 , wherein
 the housing has a pair of main passages, which is connected to the cylinder and supplies and discharges the operation oil to the cylinder and   a flushing valve, which is switched by pressure difference between the pair of main passages and guides the operation oil passing through the main passage on a low pressure side to the nozzle, is provided at the housing.