Title:
【発明の名称】2つのハイドロポンプを備えたポンプ装置
Document Type and Number:
Japanese Patent JP2002533621
Kind Code:
A
Abstract:
The invention relates to a pump assembly comprising a vane-cell pump and a second hydraulic pump which is driven together with the same. The vane-cell pump has a suction area in which first pressure chambers between the vanes and second, rear pressure chambers enlarge behind the vanes, and has a pressure area in which the pressure chambers become smaller, and in which the pressure chambers are fluidically connected to a pressure output. The vane-cell pump is provided, in particular, for delivering hydraulic fluid under a relatively high pressure to the adjusting cylinder of a hydromechanical transmission of a motor vehicle. The second hydraulic pump has positively-driven displacement elements and is provided for delivering hydraulic fluid of a circuit with a relatively low system pressure, especially of a lubricating oil circuit of the motor vehicle. According to the invention, the rear pressure chambers of the vane-cell pump are connected in the suction area to the pressure output of the second hydraulic pump so that the vane-cell pump can commence delivery of hydraulic fluid also in the instances of low outside temperatures and of hydraulic fluid which is already highly viscous at low driving motor speeds.
Inventors:
Egon Birkenmeier
Gunther Fisher
Gunther Fisher
Application Number:
JP2000591333A
Publication Date:
October 08, 2002
Filing Date:
December 16, 1999
Export Citation:
Assignee:
Mannesmann Rexroth Actien Gezershaft
International Classes:
F01C21/08; F04C11/00; F04C14/22; F04C14/28; F04C15/00; F04C15/06; (IPC1-7): F04C11/00; F04C15/00
Domestic Patent References:
| JPH0710483U | 1995-02-14 |
Attorney, Agent or Firm:
Toshio Yano (4 outside)