Patent ID: 6318241
Filing Date: 2001-11-20
Classification: B23P,F04B

Abstract:
A method of making a piston for a cylinder block of a hydrostatic power unit, comprising:combining a quantity of small steel grains with a quantity of binder to create a molding material,forming out of the molding material an elongated cylindrical body having first and second ends with an elongated cavity in the body,forming out of the molding material an insert having a compatible shape for fitting in the body to close an open end of the cavity, with the insert having an external shape to facilitate the operative engagement thereof with a slipper and subsequent engagement with a swashplate mounted adjacent the cylinder block,removing the binder from the molding material,sintering and shrinking the body and the cap proportionally so that the cap can be fitted on the body,fitting the insert in the body to close the cavity in the body, andadhering the insert to the body.