EP0065315A2
Expired / Lapsed
EP
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Intake system for two-cycle internal combustion engines
Assignee: Yamaha Motor Co Ltd
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Filing: 1982-05-18
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Granted: —
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Expires: 2002-05-18
Abstract
Abstract A two-cycle internal combustion engine having its intake passage (11) equipped with a check valve (12) and an intake plenum chamber (17), the latter being formed in the crankcase wall of the engine just below the intake passage. The crankcase wall below said intake passage is formed with an opening (1b) and a cover (15) is provided to surround said opening. A diaphragm (16) is sandwiched between said crankcase and said cover, so that the cover and the diaphragm define together an intake plenum chamber (17).
Inventors
- 👤 Masahiro Yamamoto
- 👤 Masayasu Mizoguchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 06:53
CPC Classifications
F; F02; F02B; F02B25/00; F02B27/00; F02B27/003; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
163 words
A two-cycle internal combustion engine of the type in which a cylinder (2) is mounted on a crankcase (1), in which said cylinder has its cylindrical wall (2a) formed with at least one scavenging port (7a) adapted to be opened and closed by a piston (3), in which there is connected with said scavenging port an intake passage (11) then into the atmosphere, and in which there is formed in said intake passage an intake plenum chamber (17) having a movable wall (16) facing the inside of said crankcase, characterized in that in the wall of said crankcase, just below said intake passage (11) there is provided an opening (lb) for providing communication between the inside and outside of said crankcase; in that there is disposed outside of said opening an outwardly bulging cover (15); and in that a circular movable wall (16) is sandwiched between said cover and said crankcase thereby defining said intake plenum chamber (17) inside of said cover (15).
Claim 2
Dependent Claim
163 words
A two-cycle internal combustion engine of the type in which a cylinder (2) is mounted on a crankcase (1), in which said cylinder has its cylindrical wall (2a) formed with at least one scavenging port (7a) adapted to be opened and closed by a piston (3), in which there is connected with said scavenging port an intake passage (11) then into the atmosphere, and in which there is formed in said intake passage an intake plenum chamber (17) having a movable wall (16) facing the inside of said crankcase, characterized in that in the wall of said crankcase, just below said intake passage (11) there is provided an opening (lb) for providing communication between the inside and outside of said crankcase; in that there is disposed outside of said opening an outwardly bulging cover (15); and in that a circular movable wall (16) is sandwiched between said cover and said crankcase thereby defining said intake plenum chamber (17) inside of said cover (15).
Claim 3
Dependent Claim
57 words
Engine according to claim 1, characterized in that there is disposed in said intake passage (11) a check valve (12) for allowing only an air-fuel- mixture flow toward said scavenging port (7a) but blocking any backward flow, and in that said intake plenum chamber (17) is, within said intake passage, located downstream of said check valve (12).
Claim 4
Dependent Claim
32 words
Engine according to one of claims 1 and 2, characterized in that said intake passage (11) is arranged in a generally angular shape in the outer circumference of said cylindrical wall (2a).
Claim 5
Dependent Claim
28 words
Engine according to one of claims 1 to 3, characterized in that said movable wall is a . diaphragm (16) made of rubber or a rubber-like synthetic resin.
Claim 6
Dependent Claim
30 words
Engine according to one of claims 1 to 4, characterized in that a communication passage (18) is provided to connect said intake plenum chamber (17) and said intake passage (11).
Claim 7
Dependent Claim
35 words
Engine according to one of claims 1 to 5, characterized in that said movable wall (16) is fixed to the outer side of said crankcase (1) for closing said opening (lb) within said crankcase wall.
Claim 8
Dependent Claim
28 words
Engine according to one of claims 1 to 6, characterized in that said plenum chamber (17) is formed in the crankcase wall just below said intake passage (11).
Claim 9
Dependent Claim
42 words
Engine according to one of claims 1 to 7, characterized in that said intake passage (11) is formed in the lower portion of the cylinder (2) which contacts said crankcase (11) and that a main branch passage (lla) connecting said intake passage
Claim 10
Dependent Claim
18 words
(11) and a main scavenging port (7a) are formed in the same direction as the cylindrical wall (2a).
Claim 11
Dependent Claim
18 words
(11) and a main scavenging port (7a) are formed in the same direction as the cylindrical wall (2a).
References Cited (Backward Citations)
No citation records indexed.
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