Cryogenic expansion machine
US4087988A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1976 |
| Grant date | May 9, 1978 |
| Priority date | — |
| Expiry date | Nov 9, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/2102
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A cryogenic expansion engine includes intake and exhaust poppet valves each controlled by a cam having adjustable dwell, the valve seats for the valves being threaded inserts in the valve block. Each cam includes a cam base and a ring-shaped cam insert disposed at an exterior corner of the cam base, the cam base and cam insert being generally circular but including an enlarged cam dwell, the circumferential configuration of the cam base and cam dwell being identical, the cam insert being rotatable with respect to the cam base. GI PAC CONTRACTUAL ORIGIN OF THE INVENTION The invention described herein was made in the course of, or under, a contract with the UNITED STATES ENERGY RESEARCH AND DEVELOPMENT ADMINISTRATION.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.