Hydraulic oil cylinder, hydraulic cushion system, excavator and concrete pump truck
US9863407B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 21, 2011 |
| Grant date | Jan 9, 2018 |
| Priority date | — |
| Expiry date | May 28, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B15/222
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The present application discloses a hydraulic oil cylinder, of which a piston rod (3) is provided with at least two cushion collars (4, 11) which are axially slidable along the piston rod (3). Axial throttle oil channels (301a, 301b) are provided between the cushion collars (4, 11) and a piston (6). A first cushion collar (4) is provided with a sealing end face (401), and an end cover of a rod cavity (1) is provided with a sealing end face (101). The sealing end face (401) of the first cushion collar contacts with the sealing end face (101) of the end cover of the rod cavity to form a seal. Hydraulic oil within the rod cavity is discharged through one axial throttle oil channel (301a) to an oil passage B.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.