US 4,180,041 AGranted

Internal combustion engine with intake arrangement to produce swirl in combustion chamber

AssigneeNissan Motor Co., Ltd.

InventorsHiroaki Miyazaki, Yasuo Sakai, Tosimitu Matuoka

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Abstract

An internal combustion engine comprises a cylinder and an intake passageway opening into the cylinder. In order to secure sufficiently high volumetric efficiency at high speed under high load operating conditions, the intake passageway is so configured as to pass therethrough a sufficient volume required for the combustible charge to be drawn into the cylinder per unit time. The intake passageway is provided with swirl means for causing the combustible charge passing through the intake passageway to swirl in the cylinder. The swirl means comprises at least one flow restrictor means so arranged as to urge the combustible charge to enter into the cylinder in a tangent direction to the cylinder wall. Control means is provided whereby the flow restrictor means reduces effective flow area thereof at low speed under light load operating conditions, thus securing strong swirl, and the flow restrictor means increase effective flow area thereof at high speed under high load operating conditions, thus securing high volumetric efficiency.

Claims14

Dependent claims

An internal combustion engine comprising:

a cylinder with a cylinder axis;
a piston reciprocably slidable within said cylinder;
means defining an intake passageway having an intake port passage having an upstream end, with respect to the flow of a combustible charge passing through said intake port passage, and a downstream end opening to said cylinder, said downstream end of said intake port passage being positioned within a plane having an unit vector which is normal to said plane and has its origin placed at the middle of said downstream end, directed toward said piston and an area disposed in proximity of said cylinder axis;
and
swirl means for causing the combustible charge passing through said intake passageway to swirl in said cylinder, said swirl means having a first flow restrictor means for restricting and directing and deflecting flow of the combustible charge passing through said intake passageway to urge the combustible charge to enter said cylinder in substantially a tangent direction to the cylinder wall;
said first restrictor means being disposed on that one of the two opposed inner wall portions of said intake passageway that is positioned nearer to said cylinder axis than the other wall portion;
said first flow restrictor means protruding into said intake passage within an area disposed in the proximity of said upstream end of said intake port passage;
said swirl means comprising:
control means whereby said first flow restrictor means varies the effective flow area of said flow restrictor means in response to load on the engine;
and said control means comprising:
a carburetor with a venturi connected to said intake passageway;
a spring means yieldably biasing said first flow restrictor means in a direction in a sense to reduce the effective flow area of said first flow restrictor means;
and
chamber means communicating with said venturi for urging, against the bias action of said spring means, said first flow restrictor means in the opposite direction in a sense to increase the effective flow area of said first flow restrictor means in response to vacuum at said venturi.

11 more elements

In an internal combustion engine having a cylinder head with a combustion chamber and an intake port passage through which air flows leading to said combustion chamber;

projection means disposed the adjacent the upstream end of said passage for creating turbulent flow in the portion of the air flowing in said passage downstream of and in the shadow of said projection means, the remaining portion of the air flowing in said passage undergoing substantially laminar flow, said projection means and that portion of the air undergoing turbulent flow defining resilient throttling means which deflects the portion of the air undergoing laminar flow in a direction away from that portion undergoing laminar flow to be directed into said combustion chamber to induce all of the air entering said chamber to swirl in said chamber, the effect of said resilient throttling means decreasing as the velocity of the air flowing through said passage increases, so that at high engine speed the charging efficiency of the engine is substantially unimpaired by the provision of said projection means.

In an internal combustion engine having a cylinder, a piston reciprocable in said cylinder an an intake passage leading to said cylinder and through which air flows to said cylinder;

means defining a chamber;
a member disposed in said intake passage and movable from a first position in which it projects into said intake passage to a second position in which it is received in said chamber so as to not project into said intake passage, said member having a first surface exposed to the flow of air flowing through said intake passage and a second surface facing said chamber so that when air flows through said intake passage a pressure differential across said first and second surfaces biases with the velocity of the air flowing through said intake passage;
and
biasing means for biasing said member toward said first position thereof;
said member being so configured as to create turbulent flow in that portion of the air flowing in said intake passage downstream and in the shadow of said member when projected into said intake passage, the amount of turbulent flow decreasing as said member moves from said first position toward said second position thereof, said member and said turbulent flow defining resilient throttling means for deflecting the remaining portion of the air flowing in said intake passage which is undergoing substantially laminar flow and directing same into said cylinder so that the air enters said cylinder substantially tangentially with respect to the cylinder wall to induce all of the air in said cylinder to swirl,
the arrangement behind such that low engine speed a high degree of swirl is induced and as the engine speed increases the effect of said resilient throttling means decreases so that high engine speed the charging efficiency of the engine is uneffected by said resilient throttling means.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/774,038Filed 3 Mar 1977
Priority: JP 51-231545 Mar 1976
Granted: 25 Dec 1979
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F02F 1/425
Of intake channels: with a separate deviation element inside the channel
F02B 31/04
Modifying induction systems for imparting a rotation to the charge in the cylinder: by means within the induction channel, e.g. deflectors
F02B 31/06
By means within the induction channel, e.g. deflectors: movable means, e.g. butterfly valves
F02F 2001/245
Arrangement of valve stems in cylinder heads: the valve stems being orientated at an angle with the cylinder axis