Cylinder block with unlined piston bores

Details Cylinder block with unlined piston bores Cylinder block with unlined piston bores

2003-11-07

2008-07-22

McMahon, M. (Department: 3747)

Internal-combustion engines

Particular piston and enclosing cylinder construction

Cylinder detail

C123S193600, C123S056100, C123S056900

Reexamination Certificate

active

07401588

ABSTRACT:
A cylinder block for an axial piston pump or motor is formed from a steel material. The block includes a plurality of bores that each have an internal bore surface of a predefined final material surface finish. The bores are subjected to various machining and heat treating processes to provide a bore surface formed from the same material as the cylinder block, and which has the desired final surface finish. Pistons are mounted within each of the bores for axial movement relative to the cylinder block. Each of the pistons is formed from a steel material and has an exterior surface that is in sliding contact with the internal bore surface. The subject cylinder block is processed to provide a steel-to-steel interface between the bore and piston and eliminates the need for liners to be specially formed or installed within each piston bore.

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