Patent Number: 6,250,900

Title: Positive displacement hydraulic unit with near-zero side clearance

Abstract: A positive displacement hydraulic unit includes a housing having a chamber formed therein with a circumferential surface bounded by a pair of spaced apart end walls. A rotary element for displacing fluid rotatably mounts in the chamber. A layer of abradable coating material is positioned between an end wall of the chamber and the adjacent side wall of the rotary element so as to provide a near-zero side clearance for the rotary element and thereby high volumetric efficiency for the hydraulic unit.

Inventors: Gostomski; Victor G. (Ames, IA)

Assignee: Sauer-Danfoss Inc.

International Classification: F01C 21/10 (20060101); F01C 21/00 (20060101); F04C 15/00 (20060101); F01C 021/00 ()

Expiration Date: 06/26/2018