Patent EP0376130A2 successfully refreshed from Google Patents.
EP0376130A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
2-Cycle engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1989-12-19
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Granted: —
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Expires: 2009-12-19
Abstract
Abstract The invention refers to a 2-cycle engine having an oiling system employed for supplying lubricating oil directly to a point to be lubricated whereas air is supplied into the crank chamber through an air intake passage containing a reed valve with the improvement that the air intake passage is provided with an oil spray nozzle the nose portion of which opens into the intake passage upstream of the reed valve. Preferably the oil is supplied to the oil spray nozzle from the bottom portion of the crank case of the engine.
Inventors
- 👤 Noritaka Matsuo
- 👤 Tatsuyuki Masuda
- 👤 Masao Koriyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 10:22
CPC Classifications
F; F01; F01M; F01M1/00; F01M1/04; F01M3/00; F02; F02B; F02B1/00; F02B1/02; F02B1/04; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B75/12; F02B2075/125; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/7888; Y10T137/7891
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
67 words
A two-cycle engine having an oiling system employed for supplying lubricating oil directly to a point to be lubricated whereas air is supplied into the crank chamber through an intake passage containing a reed valve, characterised in that, said intake passage (25) is provided with an oil spray nozzle (33) the nose portion of which opens into the intake passage (25) upstream of said reed valve (27).
Claim 2
Dependent Claim
67 words
A two-cycle engine having an oiling system employed for supplying lubricating oil directly to a point to be lubricated whereas air is supplied into the crank chamber through an intake passage containing a reed valve, characterised in that, said intake passage (25) is provided with an oil spray nozzle (33) the nose portion of which opens into the intake passage (25) upstream of said reed valve (27).
Claim 3
Dependent Claim
34 words
A two-cycle engine as claimed in claim 1 characterised in that the oil spray nozzle (33) opens nearly a centre axis or middle portion of the cross section of the air intake passage (25).
Claim 4
Dependent Claim
43 words
A two-cycle engine as claimed in at least one of the preceeding claims 1 - 2, characterised in that, said oil spray nozzle (33) opens at a distance of about 5-10 millimetres ahead of a base portion (37) of the reed valve (27).
Claim 5
Dependent Claim
34 words
A two-cycle engine as claimed in at least one of the preceeding claims 1-3, characterised in that, said oil spray nozzle (33) is directly connected with an oil pump (P) through a pipe (35).
Claim 6
Dependent Claim
70 words
A two-cycle engine as claimed in at least one of the preceeding claims 1-4, characterised in that, a bottom portion of the crank chamber (11) is communicated with the air intake passage (25) upstream of said reed valve (27) through a communicating pipe (35) including a check valve (32) for preventing intake air from flowing from said intake passage (25) into said crank chamber (11) bypassing the reed valve (27).
Claim 7
Dependent Claim
132 words
A two-cycle engine as claimed in at least one of the preceeding claims 1-5, characterised in that, a bottom portion of the crank chamber (11) and the air intake passage (25) upstream of said reed valve (27) are communicated with each other through a communicating pipe (35) containing a check valve (32) for preventing intake air from flowing from said air intake passage (25) into said crank chamber (11), wherein said communicating pipe (35) directly connects the bottom of the crank chamber (11) with the oil spray nozzle (33) enabling lubricating oil collected on the bottom of the crank chamber (11) to be supplied to the oil spray nozzle (33) upon air pressure increase into the crank chamber (11) caused by a downward exhaust stroke of a piston (6) of the engine.
Claim 8
Dependent Claim
98 words
A two cycle engine as claimed in any of claims 5 and 6, characterised in that the check valve (32) is fixed at the outside bottom portion of the crank case (3), the inlet of the check valve (33) communicates through a bore with the interior of the crank chamber (11) whereas the outlet of the check valve (32) communicates to the communicating pipe (35) which, in turn, preferably terminates into the inlet portion of the oil spray nozzle (33) the outlet nose portion of which opens into the air intake passage (34) of the intake pipe (26).
References Cited (Backward Citations)
No citation records indexed.
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