| 摘要 |
<p>A hydraulic pump includes a pump housing block (1) having means (2, 3, 4) for driving a piston (63) reciprocatingly in an axial direction, and further includes a piston-receiving cylinder (5), inlet and outlet passageways (8, 10) which connect with the cylinder (5) and which respectively feed and discharge hydraulic fluid to and from the cylinder, wherein each of the passageways (8, 10) includes a respective check valve (9, 11) which determines the direction in which hydraulic medium will flow in respective passageways. The cylinder (5) extends into the pump housing block (1) and opens onto the outside of the block (1) in an easily-reached position. A cylinder lining (61) can be removably inserted into the cylinder (5) from the outside of the block and supports against the cylinder wall. A detachable latching device prevents the lining (61) from leaving the cylinder. The lining (61) has at least one radial opening through its mantle wall and this opening (616) establishes communication between the hollow interior of the cylinder lining (61) and the passageways (8, 10) in the block (1). The lining, the piston and a piston return spring (62) can be easily removed and replaced after the latching device, for instance a locking ring, has been removed.</p> |
