The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 12, 2019
Filed:
Sep. 09, 2016
Applicant:
Danfoss Power Solutions G.m.b.h & Co. Ohg, Neumünster, DE;
Inventors:
Reinhardt Thoms, Holzbunge, DE;
Martin Wuestefeld, Neumünster, DE;
Assignee:
Danfoss Power Solutions GmbH & Co. OHG, Neumunster, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F15B 9/04 (2006.01); F15B 13/04 (2006.01); F15B 21/12 (2006.01); F04B 1/32 (2006.01); F04B 49/00 (2006.01);
U.S. Cl.
CPC ...
F15B 9/04 (2013.01); F04B 1/32 (2013.01); F04B 49/002 (2013.01); F15B 13/0402 (2013.01); F15B 21/12 (2013.01); F15B 2211/20553 (2013.01);
Abstract
The invention relates to a displacement unit () of a hydraulic machine, for which the hysteresis is reduced. For this purpose, in the control spool () and/or at the control spool () a mass body () and a spring () 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 () onto the associated control spool (), thereby reducing the friction and hence the hysteresis.