Hydrostatic hybrid drive system
US9180764B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 2011 |
| Grant date | Nov 10, 2015 |
| Priority date | — |
| Expiry date | Oct 3, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/62
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydrostatic hybrid drive system for road vehicles includes a pump/motor unit (1) connected to the powertrain of the vehicle, controlled by a control unit (5) in a pump or motor operation, and connected to a high-pressure hydraulic accumulator via a first working line (7). The first working line can be closed by a control valve (45) and connected to a low-pressure hydraulic accumulator via a second working line (9). The high-pressure hydraulic accumulator and low-pressure hydraulic accumulator are formed by a double-piston accumulator (11), in which a high-pressure side and a low-pressure side having respective accumulator pistons (15, 17) are formed in an accumulator housing (13). The fluid chambers (23, 25) of the high-pressure side and the low-pressure side are separated by a central housing part (21) through which the common piston rod for both accumulator pistons (15, 17) extends. The control unit (5) of the pump/motor unit (1) having a control area can be supplied from the first working line (7) via a line connection (59) provided on the first working line (7) between the pump/motor unit (1) and the control valve (45).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.