Mixer drum driving apparatus driven by liquid-pressure pump and auxiliary liquid-pressure pump that is driven by electric motor
US9346186B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 11, 2013 |
| Grant date | May 24, 2016 |
| Priority date | — |
| Expiry date | Sep 11, 2033 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/44
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A mixer drum driving apparatus includes a liquid-pressure motor that drives the mixer drum to rotate, a liquid-pressure pump that is driven by a motive force of an engine and supplies working liquid to the liquid-pressure motor, an auxiliary liquid-pressure pump that is driven by an electric motor and supplies working liquid to the liquid-pressure motor, a pressure detector that detects a liquid pressure of working liquid discharged from the auxiliary liquid-pressure pump, and a switching valve that switches whether or not working liquid from the auxiliary liquid-pressure pump is supplied to the liquid-pressure motor. In a state in which the switching valve is closed and the mixer drum is being driven to rotate by the liquid-pressure motor that is driven by the liquid-pressure pump, the controller opens the switching valve if a liquid pressure detected by the pressure detector reaches or exceeds a preset liquid pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.