US4969422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Breather system for a balancer gear chamber of a two-cycle engine
Assignee: Subaru Corp
•
Filing: 1989-09-22
•
Granted: 1990-11-13
•
Expires: 2009-09-22
Abstract
Abstract A two-cycle engine has a balancer shaft driven by a crankshaft of the engine through gears, and a gear cover forming a balancer gear chamber for the gears. The balancer gear chamber is communicated with the atmosphere through a breather passage formed in an upper portion thereof. A labyrinth passage is formed in the balancer gear chamber for breathing air, so as to separate oil from discharging air.
Inventors
- 👤 Hideyuki Ishikawa
- 👤 Fusao Tachibana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:34
CPC Classifications
F; F01; F01M; F01M9/00; F01M9/06; F01M13/00; F01M13/04; F16; F16F; F16F15/00; F16F15/22; F16F15/26; F16F15/264; F01M2013/0422; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
121 words
A breather system for a two-cycle engine having a balancer shaft rotatably supported in a crankcase of the engine and driven by a crankshaft of the engine through gears, the system comprising: a gear cover secured to the crankcase to form a balancer gear chamber for said gears and form an oil reservoir in a lower portion thereof; either of said crankcase or gear cover having a breather passage in an upper portion thereof, a breather chamber communicating said balancer gear chamber with the atmosphere; an oil separating member hanging down from an upper wall of the balancer gear chamber and through the breather chamber to form a portion of said breather passage by forming a labyrinth passage for breathing air.
Claim 2
Dependent Claim
121 words
A breather system for a two-cycle engine having a balancer shaft rotatably supported in a crankcase of the engine and driven by a crankshaft of the engine through gears, the system comprising: a gear cover secured to the crankcase to form a balancer gear chamber for said gears and form an oil reservoir in a lower portion thereof; either of said crankcase or gear cover having a breather passage in an upper portion thereof, a breather chamber communicating said balancer gear chamber with the atmosphere; an oil separating member hanging down from an upper wall of the balancer gear chamber and through the breather chamber to form a portion of said breather passage by forming a labyrinth passage for breathing air.
Claim 3
Dependent Claim
13 words
The system according to claim 1, wherein the breather passage includes breather chambers.
Claim 4
Dependent Claim
25 words
The system according to claim 1, wherein said oil separating member is formed by extending a gasket disposed between the crankcase and the gear cover.
Claim 5
Dependent Claim
20 words
The system according to claim 2, wherein each said breather chamber is communicated with the adjacent chamber through a port.
References Cited (Backward Citations)
US2902012A
Cited
DE1256476B
Cited
US4103650A
Cited
US4465029A
Cited
JPS58204910A
Cited
JPS6027765A
Cited
US4836156A
Cited
US4846124A
Cited
US4825818A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-12 | 1994-05-14 | 1994-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-12 | 1998-05-14 | 1998-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-12 | 2002-05-14 | 2002-11-13 | $7700.00 | Window Closed / Lapsed |