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:
May. 21, 2013
Filed:
Nov. 10, 2009
Frank Ramm, Flintbek, DE;
Frank Ramm, Flintbek, DE;
Sauer Danfoss Inc., Ames, IA (US);
Abstract
The invention relates to a hydraulic drive () having a main pump (), which can be adjusted in terms of delivery volume and delivery direction, and having a hydraulic motor (), which main pump () and hydraulic motor () are connected to one another in a closed circuit via pressure lines (A,B), and having a charge pump () for charging into the closed circuit and for supplying pressurized fluid to at least one controlling device (), wherein the charge pump () has a separate drive motor () whose power/rotational speed can be specified independently of the rotational speed of the drive () of the main pump (). In this way, the charge pump () can be of smaller dimensions than previously conventional, and the power balance of the hydraulic drive can be improved.