Piston retention apparatus and method
US9200708B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 2013 |
| Grant date | Dec 1, 2015 |
| Priority date | — |
| Expiry date | Jun 5, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49256
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An apparatus and method for coupling a piston to a rod to form a cylinder assembly are provided. The piston has a tapped bore extending therethrough for coupling to a first threaded region of the rod. The rod end extends beyond the piston member and includes a second threaded region for coupling to a tapped bore of a retaining member. The piston member is coupled to the rod member at a low torque, e.g., up to about 1000 Nm. An external thread of each of the threaded segment of the piston bore and the first threaded region of the first portion of the rod member may be formed with a root radius of greater than 0.125 pitch or with MJ class thread. The retaining member may include setscrews offset from one another for frictional engagement with the rod end. The thread pitch between the rod and the piston may be coarser than between the rod and the retaining member. An interface and a seal region between the rod and the piston may be disposed closer to the rod end side of the piston member than the threaded coupling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.