US3762387A
Expired / Lapsed
US
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Arrangement for automatically positioning a piston in an internal combustion engine
Assignee: Husqvarna Vapenfabriks AB
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Filing: 1970-08-31
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Granted: 1973-10-02
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Expires: 1990-08-31
Abstract
Abstract A piston in an internal combustion engine is positioned, i.e., moved from any position in a complete working cycle including all strokes of the engine, to a distinct position by tensioning means and at least one elastic member which, as a result of the reciprocating movements of the piston mutually actuate each other so that the elastic member is tensioned during the passage of the piston from the distinct position in the working cycle and is relaxed during the moving of the piston towards the distinct position.
Inventors
- 👤 F Blomberg
- 👤 L Tholander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:33
CPC Classifications
F; F02; F02N; F02N3/00; F02N3/02; F02B; F02B75/00; F02B75/16; F02D; F02D15/00; F02B1/00; F02B1/02; F02B1/04; F02B75/02; F02B2075/022; F02B2075/025; F02D2700/00; F02D2700/03; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18144
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
125 words
An automatic positioning means for a piston reciprocable in a cylinder in an internal combustion engine, for moving the piston from any position in a complete working cycle, including all strokes of the engine to a top-dead-center position of the piston, comprising a shaft driven by the reciprocating movement of the piston, an eccentric mounted on the shaft, an outer ring journalled on the eccentric, and at least one elastic member tensioned between the outer ring and a point on the engine body whereby the eccentric and elastic member mutually actuate each other so that the elastic member is tensioned during the passage of the piston from its top-dead-center position in the working cycle and relaxed during movement of the piston towards the topdead-center position.
Claim 2
Dependent Claim
125 words
An automatic positioning means for a piston reciprocable in a cylinder in an internal combustion engine, for moving the piston from any position in a complete working cycle, including all strokes of the engine to a top-dead-center position of the piston, comprising a shaft driven by the reciprocating movement of the piston, an eccentric mounted on the shaft, an outer ring journalled on the eccentric, and at least one elastic member tensioned between the outer ring and a point on the engine body whereby the eccentric and elastic member mutually actuate each other so that the elastic member is tensioned during the passage of the piston from its top-dead-center position in the working cycle and relaxed during movement of the piston towards the topdead-center position.
Claim 3
Dependent Claim
27 words
The arrangement according to claim 1, characterized in that, when said engine is a two-stroke engine, said shaft is constituted by the crank shaft of the engine.
Claim 4
Dependent Claim
27 words
The arrangement according to claim 1, characterized in that, when the engine is a four-stroke engine, said shaft is constituted by the cam shaft of the engine.
Claim 5
Dependent Claim
57 words
The arrangment according to claim 1, in which the engine is provided with a flywheel characterized by a permanent magnet being positioned on the engine body adjacent the flywheel, and a second magnet being positioned on the flywheel, with said magnets cooperating in a position of the flywheel which corresponds to the top-dead-center position of the piston.
Claim 6
Dependent Claim
40 words
The arrangement according to claim 4, characterized in that the magnet positioned on the engine body is capable of movement between different positions around the periphery of the flywheel and means for locking said magnet in at least one position.
Claim 7
Dependent Claim
163 words
An automatic positioning means for a piston reciprocable in a cylinder in an internal combustion engine, for moving the piston from any position in a complete working cycle, including all strokes of the engine, to a distinct position, including a shaft driven by the reciprocating movement of the piston, at least one cam ring located concEntrically around the shaft, a cam follower, and an elastic member, a bearing shell and a case constituting a body of the arrangement, fastening means for mounting the body on a crankcase of the engine, the cam ring being provided with a curved surface defining a hollow and the elastic member being tensioned against the body and pressing the cam follower and cam ring together with the cam follower and cam ring mutually actuating each other so that the elastic member is tensioned during the passage of the piston from the distinct position in the working cycle and relaxed during movement of the piston towards the distinct position.
Claim 8
Dependent Claim
163 words
An automatic positioning means for a piston reciprocable in a cylinder in an internal combustion engine, for moving the piston from any position in a complete working cycle, including all strokes of the engine, to a distinct position, including a shaft driven by the reciprocating movement of the piston, at least one cam ring located concEntrically around the shaft, a cam follower, and an elastic member, a bearing shell and a case constituting a body of the arrangement, fastening means for mounting the body on a crankcase of the engine, the cam ring being provided with a curved surface defining a hollow and the elastic member being tensioned against the body and pressing the cam follower and cam ring together with the cam follower and cam ring mutually actuating each other so that the elastic member is tensioned during the passage of the piston from the distinct position in the working cycle and relaxed during movement of the piston towards the distinct position.
Claim 9
Dependent Claim
16 words
The arrangement according to claim 6 in which said body is turnably mounted on the crankcase.
Claim 10
Dependent Claim
25 words
The arrangement according to claim 6 in which said engine is a two-stroke engine, and the shaft is connected to the crankshaft of the engine.
Claim 11
Dependent Claim
26 words
The arrangement according to claim 6 in which, when the engine is a four-stroke engine, the shaft is connected to the cam shaft of the engine.
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |