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:
Apr. 24, 2001
Filed:
Aug. 26, 1998
Hartmut Sandau, late of Schwieberdingen, DE;
Werner Schumacher, Asperg, DE;
Holger Lueues, Bietigheim-Bissingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
An electro-hydraulic control device (,) for a hydraulic servo motor for controlling a volume flow is proposed, which is embodied as a 4/2 valve module. A blocking valve in accordance with seat valve technology between a motor connection (B) and a return flow (R) form a lowering element (,), while the associated unblocking member (,) is designed as a longitudinal slide (,), which controls the connection between an inflow connection (P) and a motor connection (A) and is actuated by a proportional magnet (,). After unblocking the blocking valve, its seat valve body (,) is mechanically taken along by the longitudinal slide (,), and the two volume flows are proportionally controlled via the lowering element (,) and the lifting element (,), so that a large switching capacity is achieved along with a construction with few leaks.