Stick control system in construction machine
US11162245B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 19, 2018 |
| Grant date | Nov 2, 2021 |
| Priority date | — |
| Expiry date | Jun 19, 2038 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/6346
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
To achieve the improvement of recovery efficiency from a rod end oil chamber to a head end oil chamber during extending operation of a stick cylinder, and at the same time, to prevent an operation speed of the stick cylinder from being impaired when recovery is impossible, as well as to achieve the reduction of the number of parts, in a construction machine equipped with a stick. It is configured such that a first region Y1 at which a discharge valve passage 14g is opened while being throttled and a second region Y2 at which the discharge valve passage 14g is wider opened than at the first region Y1 are provided, in an operating position of a stick control valve 14 during extending operation of the stick cylinder, and if recovery from the rod end oil chamber 9b to the head end oil chamber 9a during extending operation of the stick cylinder 9 is possible, the stick control valve 14 is caused to be positioned at the first region Y1, and if the recovery is impossible, positioned at the region Y2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.