Patent US4439989A successfully refreshed from Google Patents.
US4439989A
Expired / Lapsed
US
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Internal combustion engine provided with a plurality of power units
Assignee: Subaru Corp
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Filing: 1981-11-30
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Granted: 1984-04-03
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Expires: 2001-11-30
Abstract
Abstract An internal combustion engine comprising a primary engine unit and an auxiliary engine unit, in which a clutch of the auxiliary engine unit is engaged at a proper phase difference between both engine units.
Inventors
- 👤 Toru Yamakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:06
CPC Classifications
F; F02; F02B; F02B73/00; F02D; F02D17/00; F02D17/02; F02D25/00; F02D25/04; F02M; F02M13/00; F02M13/02; F02M13/023
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
81 words
An internal combustion engine for a vehicle, which comprises a plurality of independent engine units including a primary engine unit and an auxiliary engine unit, and an output shaft, characterized in that the primary engine is connected to the output shaft and the auxiliary engine unit is connected to the output shaft through a clutch, that a control system is provided with means for detecting phase difference between both engine units and for engaging the clutch at a proper phase difference.
Claim 2
Dependent Claim
81 words
An internal combustion engine for a vehicle, which comprises a plurality of independent engine units including a primary engine unit and an auxiliary engine unit, and an output shaft, characterized in that the primary engine is connected to the output shaft and the auxiliary engine unit is connected to the output shaft through a clutch, that a control system is provided with means for detecting phase difference between both engine units and for engaging the clutch at a proper phase difference.
Claim 3
Dependent Claim
31 words
An internal combustion engine for a vehicle according to claim 1 wherein said means for detecting phase difference is provided to detect phase difference between ignition timings of both engine units.
Claim 4
Dependent Claim
32 words
An internal combustion engine for a vehicle according to claim 1 wherein said means for detecting phase difference is provided to detect phase difference between rotations of crankshafts of both engine units.
References Cited (Backward Citations)
US1636050A
Cited
US2527424A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-03 | 1987-10-03 | 1988-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-03 | 1991-10-03 | 1992-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-03 | 1995-10-03 | 1996-04-03 | $7700.00 | Window Closed / Lapsed |