Patent Number: 6,167,702

Title: Rotary mechanism control with power supply

Abstract: The invention relates to a hydraulic controller, in particular for the control of the rotating mechanism of an excavator. In a hydraulic drive circuit a drive hydraulic pump (2) and a drive hydraulic motor are provided, which are connected via working lines (3, 4). The hydraulic controller includes an adjustment arrangement (9) for adjusting a setting piston (12) arranged between two setting pressure chambers (10, 11) and acting upon the displacement volume of the drive hydraulic pump (2). Further, a pre-control arrangement (8) is provided which acts upon one of the setting pressure chambers (10, 11) with a setting pressure, in dependence upon the pressure difference between two control lines (6, 7). In accordance with the development according to the invention, the precontrol arrangement (8) is connected with a feed line (30) via a pressure regulation valve (56), whereby the precontrol arrangement (8), in a control position (42, 43), connects one of the two setting pressure chambers (10; 11) with the feed line (19) via the pressure regulation valve (56) and connects the respective other setting pressure chamber (11; 10) with a pressure fluid tank (17). In a neutral position (41), both setting pressure chambers (10, 11) are connected with the feed line (30) via the pressure regulation valve (56).

Inventors: Schniederjan; Reinhold (Neu-Ulm, DE)

Assignee: Brueninghaus Hydromatik GmbH

International Classification: E02F 9/08 (20060101); E02F 9/12 (20060101); F04B 49/08 (20060101); E02F 9/22 (20060101); F16D 031/02 ()

Expiration Date: 01/02/2018