US 4,071,001 AGranted

Stratified combustion engine with prechamber

AssigneeToyota Jidosha Kogyo Kabushiki Kaisha

InventorKenji Goto

Life of this patent

Estimating the term…

Loading patent…

Abstract

A stratified combustion engine provided with a prechamber having no inlet valve associated therewith, wherein the precombustion chamber comprises a first chamber communicating with a main combustion chamber, a second chamber communicating with the first chamber only through an orifice, and a discharge electrode disposed in the orifice. In the suction stroke, a lean fuel-air mixture is charged into the main combustion chamber, while a stream of a rich fuel-air mixture, which is deflected in the direction of flow by impinging against the back face of an inlet valve, is introduced into the first chamber from the main combustion chamber through a communication passage, so that the so-called stratified charge can be achieved. In the compression stroke, the rich fuel-air mixture is charged from the first chamber into the second chamber through the orifice. In the combustion process, the rich fuel-air mixture existing in the orifice is ignited and the fuel-air mixture in the first chamber is burnt by the flame emerging continuously from the second chamber through the orifice so that the lean fuel-air mixture in the main combustion chamber can be burnt by the flame of the rich mixture burning in the first chamber.

Claims9

Dependent claims

In an improved stratified combustion engine of the type including a main combustion chamber defined by a cylinder head and a piston head, a main suction passage supplying a lean mixture into the main combustion chamber, a precombustion chamber having a discharge electrode therein and communicating with the main combustion chamber, a supply conduit in the main suction passage for directing a rich mixture to the precombustion chamber through the main combustion chamber, and an inlet valve common to the main suction passage and to the supply conduit, the improvement comprising:

a first chamber formed in the precombustion chamber,
a first passage communicating said first chamber with said main combustion chamber for introducing a flow of the rich mixture deflected from the back face of the inlet valve into said first chamber upon opening of said inlet valve,
a second passage communicating said first chamber with the main combustion chamber for scavenging a burnt gas retained in said first chamber into a portion of the main chamber remote from said inlet valve upon opening of the inlet valve,
a second chamber arranged in the precombustion chamber in axial alignment with said first chamber,
a partition dividing said first chamber from said second chamber,
an orifice formed in said partition and communicating said first chamber with said second chamber, said orifice being of sufficient size to permit at least a portion of the fuel-air mixture in said first chamber to be transferred to said second chamber during the compression state of the piston, and
said discharge electrode being disposed in said second chamber and extending into said orifice.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/581,528Filed 28 May 1975
Priority: JA 49-371703 Oct 1974
Granted: 31 Jan 1978
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F02B 19/1066
Pre-combustion chamber and cylinder being fed with fuel-air mixture: pre-combustion chamber having an inlet and an outlet port and with two…
F02B 1/04
With positive ignition: with fuel-air mixture admission into cylinder
F02P 13/00
Sparking plugs structurally combined with other parts of internal-combustion engines
Y02T 10/12
Internal combustion engine [ICE] based vehicles: improving ICE efficiencies