US3575541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil sealing unit in rotary piston engine
Assignee: Yanmar Co Ltd
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Filing: 1969-10-23
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Granted: 1971-04-20
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Expires: 1989-10-23
Abstract
Abstract An annular sealing member and a wavy spring are mounted in an oil sealing unit mounting groove formed on each side face of a rotor. The annular sealing member has a recess or recesses formed in the contacting surface with the wavy spring for receiving a crest or crests of said wavy spring, whereby said annular sealing member is secured to said wavy spring.
Inventors
- 👤 Yoshitugu Hamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:16
CPC Classifications
F; F01; F01C; F01C19/00; F01C19/08; F01C19/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
An oil sealing unit for use in a rotary piston engine comprising a cylindrical housing, a side housing closing each side of said cylindrical housing and a piston (rotor) disposed in the cavity defined by said cylindrical housing and said side housings for rotation therein and incorporating said oil sealing unit, said oil sealing unit comprising an annular sealing member and a wavy spring, said annular sealing member being formed with at least one recess in the contacting surface with said wavy spring for engagement with said wavy spring.
Claim 2
Dependent Claim
89 words
An oil sealing unit for use in a rotary piston engine comprising a cylindrical housing, a side housing closing each side of said cylindrical housing and a piston (rotor) disposed in the cavity defined by said cylindrical housing and said side housings for rotation therein and incorporating said oil sealing unit, said oil sealing unit comprising an annular sealing member and a wavy spring, said annular sealing member being formed with at least one recess in the contacting surface with said wavy spring for engagement with said wavy spring.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |