Patent · US Expired

Electrohydraulic control device

US6220288A · kind A · utility

11Cited by

3References

17Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Hartmut Sandau · Schwieberdingen, DE
Werner Schumacher · Asperg, DE
Holger Lueues · Bietigheim-Bissingen, DE

Key dates

Filing date	Aug 26, 1998
Grant date	Apr 24, 2001
Priority date	—
Expiry date	Aug 26, 2018

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/87241
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

An electro-hydraulic control device (10, 60) 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 (11), while the associated unblocking member (44) is designed as a longitudinal slide (45), which controls the connection between an inflow connection (P) and a motor connection (A) and is actuated by a proportional magnet (16). After unblocking the blocking valve, its seat valve body (23) is mechanically taken along by the longitudinal slide (45), and the two volume flows are proportionally controlled via the lowering element (11) and the lifting element (12), so that a large switching capacity is achieved along with a construction with few leaks.

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