Patent · US Active

Hydrostatic displacement unit with reduced hysteresis

US10227996B2 · kind B2 · utility

2Cited by

5References

19Claims

0Family size

Assignee

DANFOSS POWER SOLUTIONS GMBH & CO. OHG · DE

Inventors

Reinhardt Thoms · Büdelsdorf, DE
Martin Wuestefeld · Waldkirch, DE

Key dates

Filing date	Sep 9, 2016
Grant date	Mar 12, 2019
Priority date	—
Expiry date	Mar 18, 2037

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF15B2211/20553
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

The invention relates to a displacement unit (1) of a hydraulic machine, for which the hysteresis is reduced. For this purpose, in the control spool (3) and/or at the control spool (3) a mass body (16) and a spring (17) are arranged, which are excited to resonance vibrations. The vibrations are self-excited and sustained by a partial flow rate of the hydraulic fluid which is modulated periodically. The high frequent vibrations are transmitted over the spring (17) onto the associated control spool (3), thereby reducing the friction and hence the hysteresis.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.