DE2302015A1 - FOUR-STROKE PISTON ENGINE WITH EXTERNAL IGNITION - Google Patents

Description

Dr Di; * - · '^ - ^{: orf}

P-. i-ians-Λ brown 2302015

8MÜnchen86, PtwiKneuewtr. 28

16th January 1973 139/69

HONDA GIKEN KOGYO KABUSHIKI KAISHA 5,5-chome, Yaesu, Chuo-ku, Tokyo, Japan

Four-stroke piston internal combustion engine with spark ignition

The invention relates to internal combustion engines in which the or each cylinder has a main combustion chamber which is provided with inlet and outlet valves and in which an auxiliary inlet valve arrangement is provided for regulating the inlet to an auxiliary chamber which is equipped with a spark plug. The or each secondary room communicates with its respective main room through a narrow opening ^{known as the "torch nozzle 11.} A lean fuel-air mixture is supplied to the main combustion chamber through its inlet valve arrangement and a rich fuel-air mixture is supplied to the secondary combustion chamber through its auxiliary inlet valve arrangement . During operation, the rich mixture can be

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Lightly ignite the room through the spark plug and the resulting flame front, which passes through the torch nozzle, ignites the lean mixture in the main room.

In an internal combustion engine of this type the relatively rich mixture that is fed to the adjoining room, the tendency in the adjoining room during a To condense cold starts or sometimes when the internal combustion engine has not yet fully warmed up. There is therefore no complete fuel evaporation in the adjoining room, which leads to the disadvantage that the efficiency of the combustion in both rooms is not good and for the V / arm running of the internal combustion engine a longer time is required,

A four-stroke piston internal combustion engine according to the invention with external ignition has a main combustion chamber and a secondary combustion chamber for the or each cylinder, with the main combustion chamber is limited in part by the associated piston and with the secondary combustion chamber via a Torch nozzle is connected, inlet and outlet valves for the main combustion chamber, sine auxiliary inlet valves for the adjoining room, and a device for igniting the combustible mixture in the adjoining room, the latter inside of a cavity and contains a metallic lining made of a heat-resistant Material is formed, wherein an electrical heater is provided for heating the liner.

Advantageously, the lining, which is made of corrosion-resistant Steel can be made a distance from the walls of the cavity and is an electrical heating element arranged in the annular space between the liner and the cavity wall. Preferably the heating element

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formed by a resistance wire that forms the lining surrounds, and there may be an insulating material in the annulus are provided. Allows the use of an electrical heater for the lining the heating of the adjoining room before starting the internal combustion engine in the cold state and during the cranking process, thereby reducing evaporation of the rich fuel-air mixture is favored and the time is reduced, which is required to bring the internal combustion engine to operating temperature.

An embodiment of an internal combustion engine according to the invention is described in more detail below, for example in connection with the accompanying drawing, Many shows a sectional view of part of an internal combustion engine.

The cylinder head 1 of an internal combustion engine shown in the drawings can be attached in a conventional manner to an engine block with cylinders and pistons, etc., which are not shown. A shark combustion chamber 2 is formed in the cylinder head 1 above a piston and an auxiliary combustion chamber 3 in the cylinder head is connected to the main chamber 2 via a torch nozzle H. A spark plug 5 is screwed into the cylinder head 1 so that its electrodes extend into the auxiliary chamber 3.

The main combustion chamber 2 is provided with an inlet valve 6 and an outlet valve (not shown) and is supplied with a relatively lean mixture when the inlet valve 6 is opened.

A heating element 7 which is in the shape of a cylindrical

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Has sleeve or liner 8 is arranged within the cavity formed in the cylinder head 1 * Die Sleeve 8 is made of corrosion-resistant steel or another heat-resistant material. A coil-shaped one electrical resistance heating element 9 surrounds the sleeve 8 and is of a suitable elastic Insulating material covered. The sleeve 8 is in the recess through a recessed valve guide 12 attached. The heating wire 9 is connected to a power source 11 through a control switch 10 and a main switch 10 'connected. With an ignition circuit is designated.

The valve guide 12 slidably supports an auxiliary intake valve 13 for regulating the flow of a rich mixture to the adjoining room 3. The valve 13 is through a conventional valve actuation mechanism V with a cam IS, a rocker arm 16 and a valve spring open and closed.

When the engine is cold and started is to be, the control switch 10 is closed to to excite the heating wire coil 9, through which the temperature of the metal sleeve 8 is rapidly increased. The fat one Mixture that is sucked into the relatively small volume of the secondary combustion ν aumes 3 is in vaporized form and condensation is reduced to a minimum. The ignition of the rich vaporized mixture happens through the spark plug, which extends through an opening 18 in the wall of the sleeve 8. A further opening 19 in the sleeve 8 forms part of the torch nozzle U.

During the intake stroke of the internal combustion engine

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a lean mixture is sucked into the main combustion chamber 2, when the main inlet valve 6 is opened while a rich mixture is sucked into the sub-combustion chamber 3 when the auxiliary intake valve 13 is opened. Subsequently, the spark plug 5 is energized during the ignition in order to ignite the rich mixture in the adjoining chamber 3, and the resulting jet of flame passing through the torch nozzle H ignites the lean mixture in the main combustion chamber 2. The internal combustion engine works continuously with a mixture of a relative lean overall air-fuel ratio,

A separate heating of the auxiliary combustion chamber, if the engine block is not fully warmed up, for example when the engine is out of the If it is left on in a cold state, the evaporation of the rich fuel mixture, which is sent to the secondary combustion chamber, accelerates is fed. The ignition and combustion properties are improved so that the internal combustion engine can be started more easily and warmed up in a shorter period of time.

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Claims (1)

139 / G9 ° Patent claims : t) four-stroke piston internal combustion engine with spark ignition, characterized by a main combustion chamber (2) and a secondary combustion chamber 3 for the or each cylinder, the main combustion chamber (2) being partially delimited by the associated piston and with the secondary chamber (3) is connected via a torch nozzle (4), an inlet valve assembly (6) and a Outlet valve arrangement for the main combustion chamber (2), an auxiliary inlet valve (13) for the adjoining chamber (3) and a device for igniting the combustible mixture in the secondary area (3), the latter within a cavity is provided and contains a metallic sleeve (8) made of a heat-resistant Material consists, with an electrical heating device (7) being provided for heating the sleeve (8). 2. Machine according to claim 1, characterized in that the sleeve (8) extends from the V7andung of the cavity is at a distance and an electrical heating element (9) is arranged in the annular space, which is between the sleeve (8) and cavity wall 4 is located. 3. Machine according to claim 2, characterized in that the heating element is formed by a resistance wire 309830/0487 139/69 1 ivird, which surrounds the sleeve (8). Machine according to claim 2 or 3, characterized in that a Insulating material is provided. 5 «machine according to claims 1 - H , characterized in that the sleeve (8) consists of corrosion-resistant steel. 6. Machine according to claims 1-5, characterized in that that the sleeve (8) is provided with a first opening (19) which is connected to the torch nozzle (* 4) is in communication, and with a second opening (18) which is in communication with the ignition device (5) stands. 309830/0487 Blank page