Patent US4556026A successfully refreshed from Google Patents.
US4556026A
Expired / Lapsed
US
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Multiple-displacement engine
Assignee: Mazda Motor Corp
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Filing: 1985-03-18
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Granted: 1985-12-03
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Expires: 2005-03-18
Abstract
Abstract A multiple-displacement engine which can be operated either in a full-displacement state in which all the cylinders are operative or a part-displacement state in which a part of the cylinders are inoperative is provided with a balancer for attenuating torque fluctuation due to explosion in the operative cylinders in the part-displacement state of the engine. The engine is further provided with a balancer actuator which actuates the balancer when the engine is operated in the part-displacement state.
Inventors
- 👤 Shunji Masuda
- 👤 Hisashi Nakaya
- 👤 Katumi Okazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:03
CPC Classifications
F; F01; F01L; F01L13/00; F02; F02D; F02D17/00; F02D17/02; F16; F16F; F16F15/00; F16F15/22; F16F15/26; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
147 words
A multiple-displacement engine which can be operated either in a full-displacement state in which all the cylinders thereof are operative or a part-displacement state in which a part of the cylinders are inoperative, and comprises fuel supply interruption means for cutting fuel supply to a part of the cylinders, operating condition detecting means for detecting operating condition of the engine, and cylinder number control means which determines the number of cylinders to be supplied with fuel according to a signal from the operating condition detecting means and actuates the fuel supply interruption means, characterized by having balancer means for generating moment which attenuates torque fluctuation due to explosion in the operative cylinders in the part-displacement state of the engine, and balancer actuating means which receives a control signal from the cylinder number control means and actuates the balancer when the engine is operated in the part-displacement state.
Claim 2
Dependent Claim
147 words
A multiple-displacement engine which can be operated either in a full-displacement state in which all the cylinders thereof are operative or a part-displacement state in which a part of the cylinders are inoperative, and comprises fuel supply interruption means for cutting fuel supply to a part of the cylinders, operating condition detecting means for detecting operating condition of the engine, and cylinder number control means which determines the number of cylinders to be supplied with fuel according to a signal from the operating condition detecting means and actuates the fuel supply interruption means, characterized by having balancer means for generating moment which attenuates torque fluctuation due to explosion in the operative cylinders in the part-displacement state of the engine, and balancer actuating means which receives a control signal from the cylinder number control means and actuates the balancer when the engine is operated in the part-displacement state.
Claim 3
Dependent Claim
49 words
A multiple-displacement engine as defined in claim 1 in which said balancer means comprises a balancer shaft extending in parallel to the crankshaft of the engine and a weight eccentrically provided on the balancer shaft, and is adapted to be driven by the crankshaft by way of clutch means.
Claim 4
Dependent Claim
59 words
A multiple-displacement engine as defined in claim 2 in which said clutch means is disposed between the balancer shaft and the crankshaft, and said balancer actuating means comprises the clutch means and timing control means which connects the balancer shaft to the crankshaft in a predetermined phase in response to a cylinder-reduction signal from the cylinder number control means.
Claim 5
Dependent Claim
68 words
A multiple-displacement engine as defined in claim 3 in which said timing control means comprises position detecting means for detecting the positions of the crankshaft and the balancer shaft, gate means provided between the cylinder number control means and the clutch means, and timing determination means which outputs a signal for opening the gate means at a predetermined time in response to a signal from the gate means.
Claim 6
Dependent Claim
42 words
A multiple-displacement engine as defined in claim 2 in which said balancer shaft includes an even number of shafts and is arranged to statically balance by itself, the balancer shaft being adapted to be rotated in the direction opposite to the crankshaft.
Claim 7
Dependent Claim
24 words
A multiple-displacement engine as defined in claim 2 in which a pair of said weights are provided on opposite ends of the balancer shaft.
Claim 8
Dependent Claim
55 words
A multiple-displacement engine as defined in claim 1 in which said operating state detecting means comprises an engine load sensor and said cylinder number control means actuates said fuel supply interruption means to change the operating state of the engine to the part-displacement state when load on the engine is lighter than a predetermined value.
Claim 9
Dependent Claim
60 words
A multiple-displacement engine as defined in claim 7 in which said operating state detecting means further comprises an engine speed sensor for detecting the engine speed and said cylinder number control means actuates said fuel supply interruption means to change the operating state of the engine to the part-displacement state when the engine speed is lower than a predetermined value.
References Cited (Backward Citations)
CA637117A
Cited
US4000666A
Cited
US4125036A
Cited
US4095579A
Cited
JPS5267420A
Cited
US4290395A
Cited
US4337740A
Cited
US4368701A
Cited
US4389985A
Cited
US4394854A
Cited
JPS57338A
Cited
GB2100800A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-02 | 1989-06-03 | 1989-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-02 | 1993-06-03 | 1993-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-02 | 1997-06-03 | 1997-12-03 | $7700.00 | Window Closed / Lapsed |