Patent US4549520A successfully refreshed from Google Patents.
US4549520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Breathing device for four stroke engine
Assignee: Kawasaki Motors Ltd
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Filing: 1984-07-27
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Granted: 1985-10-29
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Expires: 2004-07-27
Abstract
Abstract The breathing device for the 4 stroke engine includes a first separating chamber formed as a tappet chamber and a second separating chamber provided above a crank case. The second separating chamber is arranged above the first separating chamber. The crank chamber and the first separating chamber are communicated to each other by a first oil return port and a first vent arranged above the first oil return port. The first separating chamber and the second separating chamber are communicated to each other by a check valve. The second separating chamber and the crank case are communicated to each other by a second oil return port.
Inventors
- 👤 Shinichi Tamba
- 👤 Takashi Mitadera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:59
CPC Classifications
F; F01; F01M; F01M13/00; F01M13/0011; F01M13/04; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B75/007
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
197 words
In a 4 stroke engine wherein the improvement comprises a breathing device, said breathing device comprising a first separating chamber for separating oil from air, said first separating chamber being formed as a tappet chamber having openings for receiving tappet shafts, a crank chamber, a vertical crank shaft in the crank chamber, a bearing for said crank shaft, a second separating chamber for separating oil from air provided above said crank chamber and said second separating chamber being positioned at a side of the bearing of the crank shaft, a first oil return port provided in the bottom of the first separating chamber for communicating with the crank chamber, a second oil return port provided in the bottom of the second separating chamber for communicating with the crank chamber, a first vent provided for communicating the crank chamber with the first separating chamber, a second vent for communicating the first separating chamber with the second separating chamber, a check valve arranged in the second vent for allowing air to flow only from the first separating chamber to the second separating chamber, and a third vent positioned above the second oil return port in the second separating chamber.
Claim 2
Dependent Claim
197 words
In a 4 stroke engine wherein the improvement comprises a breathing device, said breathing device comprising a first separating chamber for separating oil from air, said first separating chamber being formed as a tappet chamber having openings for receiving tappet shafts, a crank chamber, a vertical crank shaft in the crank chamber, a bearing for said crank shaft, a second separating chamber for separating oil from air provided above said crank chamber and said second separating chamber being positioned at a side of the bearing of the crank shaft, a first oil return port provided in the bottom of the first separating chamber for communicating with the crank chamber, a second oil return port provided in the bottom of the second separating chamber for communicating with the crank chamber, a first vent provided for communicating the crank chamber with the first separating chamber, a second vent for communicating the first separating chamber with the second separating chamber, a check valve arranged in the second vent for allowing air to flow only from the first separating chamber to the second separating chamber, and a third vent positioned above the second oil return port in the second separating chamber.
Claim 3
Dependent Claim
208 words
In a 4 stroke engine wherein the improvement comprises a breathing device, said breathing device, comprising a first separating chamber for separating oil from air, said first separating chamber being formed as a tappet chamber having openings for receiving tappet shafts, a crank chamber, an elongated vertical crank shaft in the crank chamber, a bearing for said crank shaft, a second separating chamber for separating oil from air provided above the first separating chamber and said second separating chamber being positioned at a side of said bearing, a first oil return port provided in the bottom of the first separating chamber for communicating with the crank chamber, a second oil return port provided in the bottom of the second separating chamber for communicating with the crank chamber, a first vent provided above the first oil return port for communicating the crank chamber with the first separating chamber, a second vent for communicating an upper surface of the first separating chamber with the bottom of the second separating chamber, a check valve arranged in the second vent for allowing air to flow only from the first separating chamber to the second separating chamber, and a third vent positioned above the second oil return port in the second separating chamber.
Claim 4
Dependent Claim
208 words
In a 4 stroke engine wherein the improvement comprises a breathing device, said breathing device, comprising a first separating chamber for separating oil from air, said first separating chamber being formed as a tappet chamber having openings for receiving tappet shafts, a crank chamber, an elongated vertical crank shaft in the crank chamber, a bearing for said crank shaft, a second separating chamber for separating oil from air provided above the first separating chamber and said second separating chamber being positioned at a side of said bearing, a first oil return port provided in the bottom of the first separating chamber for communicating with the crank chamber, a second oil return port provided in the bottom of the second separating chamber for communicating with the crank chamber, a first vent provided above the first oil return port for communicating the crank chamber with the first separating chamber, a second vent for communicating an upper surface of the first separating chamber with the bottom of the second separating chamber, a check valve arranged in the second vent for allowing air to flow only from the first separating chamber to the second separating chamber, and a third vent positioned above the second oil return port in the second separating chamber.
Claim 5
Dependent Claim
43 words
Breathing device for the 4 stroke engine as claimed in claim 1 or 2, wherein the second oil return port is formed as a canal elongated from the second separating chamber to the crank chamber through a bearing surface of the crank shaft.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |