Patent EP0779412A2 successfully refreshed from Google Patents.
EP0779412A2
Expired / Lapsed
EP
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Lubricating system in a 4-cycle engine
Assignee: Honda Motor Co Ltd
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Filing: 1996-12-12
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Granted: —
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Expires: 2016-12-12
Abstract
Abstract An oil reservoir chamber, a crank chamber and a valve-operating chamber are provided in an engine body. The oil reservoir chamber and the crank chamber are in communication with each other through a through-hole, and the crank chamber and the valve-operating chamber are in communication with the each other through a one-way valve which is opened upon rising of the pressure in the crank chamber. The valve-operating chamber and the oil reservoir chamber are in communication with each other through an orifice. By utilizing a pressure pulsation in the crank chamber, an oil mist produced in the oil reservoir chamber is circulated from the oil reservoir chamber to the crank chamber, the valve-operating chamber and the oil reservoir chamber. Thus, in any operational attitude of an engine, the lubricating oil can be circulated without use of special oil pump.
Inventors
- 👤 Yasutake c/o KK Honda Gijutsu Kenkyusho Ryo
- 👤 Souhei c/o KK Honda Gijutsu Kenkyusho Honda
- 👤 c/o KK Honda Gijutsu Kenkyusho Nishida Takao
- 👤 Takanori KK Honda Gijutsu Kenkyusho Tsugekawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 07:40
CPC Classifications
F; F01; F01M; F01M1/00; F01M11/00; F01M11/06; F01M11/062; F01M11/064; F01M1/04; F01M9/00; F01M9/06; F02; F02B; F02B63/00; F02B63/02; F02F; F02F1/00; F02F1/002; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B2275/00; F02B2275/30; F02B2275/34
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
212 words
A system for lubricating a 4-cycle engine, comprising: an oil reservoir chamber which stores a lubricating oil therein and has an oil mist producing means contained therein for producing an oil mist from the lubricating oil; a crank chamber having a crank portion of a crankshaft contained therein; and a valve-operating chamber having a valve-operating device contained therein, said oil reservoir chamber, said crank chamber and said valve-operating chamber being provided in an engine body, said oil reservoir chamber and said crank chamber being in communication with each other through a through-hole above an oil level in said oil reservoir chamber, said crank chamber and said valve-operating chamber being in communication with each other through a control valve which is opened upon rising of the pressure in said crank chamber and closed upon reduction of the pressure in said crank chamber, said valve-operating chamber being substantially in communication at its upper portion with the atmosphere and at its bottom portion with said oil reservoir chamber through an orifice, and the following expression is established during operation of the engine: Pc ≤ Po < Pv wherein Pc is a pressure in the crank chamber; Po is a pressure in the oil reservoir chamber; and Pv is a pressure in the valve operating chamber.
Claim 2
Dependent Claim
77 words
A system for lubricating a 4-cycle engine according to claim 1, further including an uppermost chamber which occupies a position above the valve-operating chamber and to communicate with the valve-operating chamber through an orifice and also communicate with said oil reservoir chamber or said crank chamber through an oil passage, and the following expression is established during operation of the engine: Pc ≤ Po ≤ Pt < Pv wherein Pt is a pressure in said uppermost chamber.
Claim 3
Dependent Claim
52 words
A system for lubricating a 4-cycle engine according to claim 1 or 2, wherein said oil mist producing means comprises an oil slinger which is rotated by said crankshaft to agitate and scatter the lubricating oil in said oil reservoir chamber at all times, irrespective of the inclined state of the engine.
Claim 4
Dependent Claim
22 words
A system for lubricating a 4-cycle engine according to claim 1, wherein said control valve comprises a one-way valve of pressure-responsive type.
Claim 5
Dependent Claim
46 words
A system for lubricating a 4-cycle engine according to claim 1, wherein said control valve comprises a rotary valve which is opened upon the lowering movement of a piston operatively associated with the rotation of the crankshaft and closed upon the elevating movement of the piston.
Claim 6
Dependent Claim
72 words
A system for lubricating a 4-cycle engine according to claim 5, wherein the opening duration of said rotary valve is approximately 180° in terms of a crank angle, and the start point of opening of said rotary valve is set in a range of from a middle point between top and bottom dead centers of the piston to a lowering-piston position of 45° of said piston in terms of the crank angle.
Claim 7
Independent Claim
173 words
A system for lubricating an air-cooled 4-cycle engine comprising: a shroud covering an outer periphery of a cylinder block and defining a cooling-air passage between the shroud and the outer periphery of the cylinder block; a cooling blade mounted at one end of a crankshaft supported in a crankcase for feeding cooling air into the cooling-air passage; and a recoil type starter which is mounted to the crankcase to protrude the outside of the shroud and which is capable of cranking the other end of the crankshaft, wherein said lubricating system further includes an oil reservoir chamber formed in the crankcase and disposed between the recoil type starter and a crank chamber in said crankcase having a crank portion of the crankshaft contained therein for storing a lubricating oil, an oil mist producing means contained in said oil reservoir chamber for agitating the lubricating oil to produce an oil mist, and the oil mist produced in the oil reservoir chamber is supplied to the crank chamber and the various portions of the engine.
Claim 8
Independent Claim
128 words
A system for lubricating an air-cooled 4-cycle engine comprising: an oil reservoir chamber provided in an engine body having a crank chamber and a valve-operating chamber for sequentially supplying a lubricating oil to said crank chamber and said valve-operating chamber, said valve-operating chamber and said oil reservoir chamber being in communication with each other through an oil circulating passage for returning the lubricating oil from said valve-operating chamber to said oil reservoir chamber, wherein an opening of the oil circulating passage into the oil reservoir chamber is disposed such that it is exposed above an oil level of the lubricating oil in the oil reservoir chamber in a sideways-fallen state or an inverted state of the engine in which the valve-operating chamber comes below the oil reservoir chamber.
Claim 9
Independent Claim
179 words
A system for lubricating a 4-cycle engine comprising: a crank chamber having a crank portion of a crankshaft contained therein and storing a lubricating oil therein, a valve operating chamber having a valve-operating device contained therein, said crank chamber and said valve-operating chamber being provided in an engine body, an oil mist producing means provided in said crank chamber for producing an oil mist from the lubricating oil, said crank chamber and said valve operating chamber being in communication with each other above an oil level of the lubricating oil in the crank chamber through a control valve which is opened upon rising of the pressure in said crank chamber and closed upon reduction of the pressure in said crank chamber, said valve-operating chamber being substantially in communication at its upper portion with atmosphere, and in communication at its bottom with said crank chamber through an orifice, and the following expression is established during operation of the engine: Pc < Pv wherein Pc in a pressure in said crank chamber, and Pv is a pressure in the valve-operating chamber.
Claim 10
Dependent Claim
69 words
A system for lubricating a 4-cycle engine according to claim 9, further including an uppermost chamber provided the engine body to occupy a position above said valve-operating chamber and to communicate with said valve-operating chamber through an orifice and also with said crank chamber through an oil circulating passage, and the following expression is established: Pc ≤ Pt < Pv wherein Pt is a pressure in said uppermost chamber.
Claim 11
Dependent Claim
46 words
A system for lubricating a 4-cycle engine according to claim 9, wherein said control valve comprises a rotary valve which is opened upon the lowering movement of a piston operatively associated with the rotation of the crankshaft and closed upon the elevating movement of the piston.
Claim 12
Dependent Claim
72 words
A system for lubricating a 4-cycle engine according to claim 11, wherein the opening duration of said rotary valve is approximately 180° in terms of a crank angle, and the start point of opening of said rotary valve is set in a range or from a middle point between top and bottom dead centers of the piston to a lowering-piston position of 45° of said piston in terms of the crank angle.
Claim 13
Dependent Claim
81 words
A system for lubricating a 4-cycle engine according to claim 9, wherein said crank chamber comprises an inner chamber in which the crank portion of the crankshaft is disposed, and an outer chamber adjoining opposite sides of said inner chamber on opposite sides of a partition wall and communicating with a bottom of said inner chamber, and wherein much of the lubricating oil in said crank chamber is received in said outer chamber when the engine is fallen sideways or inverted.
References Cited (Backward Citations)
No citation records indexed.
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