Hydrostatic pump or motor for measuring revolution rate and/or position in motor vehicle

摘要

The hydrostatic pump or motor has a driven or drive shaft (2) mounted in a housing (1) and connected to rotate around an axis (9) with a meter ring (15) which rotates within a housing inner chamber filled with a hydraulic medium or lubricating oil. The surface contour of the meter ring is designed so that it has the same radial extent around its circumference when viewed cross-sectionally. The meter ring is made of a metal (19) and enveloped in a polymer (18) which is sprayed onto it, or is made of the polymer with metal inserted into empty spaces (17) situated at regular intervals.