Slewing type working machine
US9506220B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 23, 2014 |
| Grant date | Nov 29, 2016 |
| Priority date | — |
| Expiry date | Feb 16, 2035 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/88
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Provided is a slewing-type working machine capable of reducing back pressure generated during slewing. The slewing-type working machine includes: a base carrier; an upper slewing body; a hydraulic motor 11 including first and second ports 11a and 11b and slewing the upper slewing body; a hydraulic pump 10, a slewing operation device 12 including an operating member 12a; a control valve 13 controlling the hydraulic motor 11 based on the operation signal of the slewing operation device 12; first and second pipe-lines 14, 15 connecting the first and second ports 11a and 11b of the hydraulic motor 11 to the control valve; a communication switching device 25 and 26 capable of switching communication and cutting of between both pipe-lines 14, 15 and the tank T; and a switching command section 27 operating the communication switching devices 25 and 26, when the upper slewing body is slewed, to bring only a pipe-line, which corresponds to a discharge-side pipe-line of the hydraulic motor 11, of the pipe-lines 14 and 15 into communication with the tank T, while bypassing the control valve 13.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.