Patent US3799708A successfully refreshed from Google Patents.
US3799708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling arrangement for a combustion engine having a rotary type piston
Assignee: Volkswagen AG
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Filing: 1972-07-25
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Granted: 1974-03-26
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Expires: 1992-07-25
Abstract
Abstract In a combustion engine having a rotary-type piston arrangement, and wherein the engine has a housing adapted to be cooled by a cooling medium, a piston of the rotary type mounted for rotation on an eccentric shaft and forming operating spaces of variable volume during rotation with a portion of the housing wall, such operating spaces being defined by arched portions of the housing and by the piston, the housing has a pair of side members and at least a central peripheral member in which the piston is placed, an inlet opening for the entry of the cooling medium, passages formed in the side member and passages formed in the central member and communicating with the passages of the side member, an outlet passage formed in the other of the side member and communicating with the passage formed in the intermediate or peripheral member, wherein a cooling medium entering the inlet opening into at least a pair of streams and imparting a direction to the streams opposite to each other.
Inventors
- 👤 H Leptien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:07
CPC Classifications
F; F04; F04C; F04C29/00; F04C29/04; F02; F02B; F02B55/00; F02B55/08; F02B55/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
251 words
In a combustion engine having a rotary-type piston arrangement, and wherein the engine comprises a housing adapted to be cooled by a cooling medium, a piston means of the rotary type mounted for rotation on an eccentric shaft means and forming operating spaces of variable volume during rotation with a portion of the housing wall, such operating spaces being defined by arched portions of said housing and by said piston means, said housing comprises a pair of side members and at least a central peripheral member in which said piston means is placed, an inlet opening formed in one of said side members for the entry of said cooling medium, passage means formed in said side member, a plurality of passage means formed in said central member and communicating with said passage means of said side member, an outlet passage formed in the other of said side member and communicating with said plurality of individual cooling passage means formed in said central member, wherein a partitioning wall means is provided in said inlet opening for breaking up the cooling medium entering said inlet opening into at least a pair of streams and imparting a direction to each stream opposite to each other, means for communicating said passage means in one of said side members and in said central member, said communicating means having diameters increasing away from said inlet opening said passages in said peripheral member forming cooling spaces in the vicinity of said operating or combustion spaces of the engine.
Claim 2
Dependent Claim
251 words
In a combustion engine having a rotary-type piston arrangement, and wherein the engine comprises a housing adapted to be cooled by a cooling medium, a piston means of the rotary type mounted for rotation on an eccentric shaft means and forming operating spaces of variable volume during rotation with a portion of the housing wall, such operating spaces being defined by arched portions of said housing and by said piston means, said housing comprises a pair of side members and at least a central peripheral member in which said piston means is placed, an inlet opening formed in one of said side members for the entry of said cooling medium, passage means formed in said side member, a plurality of passage means formed in said central member and communicating with said passage means of said side member, an outlet passage formed in the other of said side member and communicating with said plurality of individual cooling passage means formed in said central member, wherein a partitioning wall means is provided in said inlet opening for breaking up the cooling medium entering said inlet opening into at least a pair of streams and imparting a direction to each stream opposite to each other, means for communicating said passage means in one of said side members and in said central member, said communicating means having diameters increasing away from said inlet opening said passages in said peripheral member forming cooling spaces in the vicinity of said operating or combustion spaces of the engine.
Claim 3
Dependent Claim
20 words
The combination as claimed in claim 1, wherein said exit opening is provided in the other of said side members.
Claim 4
Dependent Claim
57 words
The combination as claimed in claim 1 for a combustion engine having a plurality of said piston means, wherein a plurality of central members are provided each for one piston means, an intermediate member placed between adjacent central members, said intermediate member containing at least one passage for communicating the cooling medium between said adjacent central members.
Claim 5
Dependent Claim
30 words
The combination as claimed in claim 1, wherein said plurality of cooling spaces are provided in a number corresponding to the number of the operating spaces of the combustion engine.
Claim 6
Dependent Claim
33 words
The combination as claimed in claim 4, wherein said individual cooling spaces are separated from each other at a region corresponding to the region of the highest point of an individual operating space.
Claim 7
Dependent Claim
60 words
The combination as claimed in claim 4, wherein said passages for the inlet of the cooling medium to the individual cooling spaces in the central member are provided ahead of the direction of the rotation of said piston and said exit opening for the cooling medium are provided behind the piston when viewed in the direction of the rotation thereof.
Claim 8
Dependent Claim
73 words
The combination as claimed in claim 4, wherein said housing comprises channels for the anchor screws holding said side and central members together, said channels having a wall portion formed in the shape of a rib and extending into said individual cooling spaces for deflecting the cooling medium into a remote portion in said central member adjacent a remote portion of said operating spaces containing the sealing strips between the adjacent operating spaces.
Claim 9
Dependent Claim
60 words
The combination as claimed in claim 6, wherein said inlet passages to said individual cooling spaces in said central member are placed in a region ahead of an associated combustion space of the operating space and said exit openings from said individual cooling spaces are provided behind said region when viewed against the direction of the rotation of said piston.
Claim 10
Dependent Claim
142 words
The combination as claimed in claim 1, wherein said individual cooling passages are cooling cavities which are elongated in form in the peripheral direction along the direction of the rotation of said piston, said individual cavity being separated from each other at a region adjacent the highest point of an associated operating space of the engine whereby said individual cavity extends from a region associated with the highest point of an operating space to a region associated with the highest point of an adjacent operating space of said engine, said individual cavity having said communicating means at a portion thereof lying ahead with respect to the rotation of the piston and having said exit opening for the cooling medium at a portion thereof lying at the region of the opposite end of the cavity with respect to the rotation of the piston.
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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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |