US 11,624,313 B2Granted

Engine with combustion chamber

AssigneeMazda Motor Corporation

InventorsKazuya Rokuta, Tomomi Watanabe, Yusuke Oda, Yoshitaka Wada

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Abstract

An engine is provided, which includes a combustion chamber defined by a crown surface of a piston, an inner wall surface of a cylinder in which the piston is slidably accommodated, and a pentroof-type ceiling surface formed in a cylinder head and formed with an intake port and an exhaust port. The crown surface includes an exhaust-side bottom part, an intake-side bottom part, an exhaust-side sloped surface rising toward a center part of the crown surface from the exhaust-side bottom part, an intake-side sloped surface rising toward the center part from the intake-side bottom part, and a flat surface provided continuously between upper ends of the exhaust-side and intake-side sloped surfaces, and extending perpendicularly to a cylinder axial direction in the center part of the crown surface. A surface area of the flat surface is larger than a surface area of the exhaust-side sloped surface.

Claims18

Dependent claims

An engine comprising:

a combustion chamber defined by a crown surface of a piston, an inner wall surface of a cylinder in which the piston is slidably accommodated, and a pentroof ceiling surface formed in a cylinder head, wherein
an opening of an intake port configured to supply intake air to the combustion chamber and an opening of an exhaust port configured to discharge exhaust gas from the combustion chamber are formed in the ceiling surface, a side on which the intake port is disposed is an intake side, and a side on which the exhaust port is disposed is an exhaust side,
the crown surface includes:
an exhaust-side bottom part disposed near an exhaust-side edge of the crown surface, and an intake-side bottom part disposed near an intake-side edge of the crown surface;
an exhaust-side sloped surface rising toward a center part of the crown surface from the exhaust-side bottom part;
an intake-side sloped surface rising toward the center part of the crown surface from the intake-side bottom part;
and
a flat surface provided continuously between an upper end of the exhaust-side sloped surface and an upper end of the intake-side sloped surface, and extending in a direction perpendicular to an axial direction of the cylinder in the center part of the crown surface,
a surface area of the flat surface is larger than a surface area of the exhaust-side sloped surface,
the flat surface includes an inter-recess flat surface disposed between a pair of recess parts of the exhaust-side sloped surface, and that continues to a main portion of the flat surface, and
no cavity is formed in the flat surface.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/453,827Filed 5 Nov 2021
Priority: JP JP2020-19504025 Nov 2020
Published: US 2022/0162982 A126 May 2022
Granted: 11 Apr 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

F02B 23/10
With positive ignition: with separate admission of air and fuel into cylinder
F02B 23/104
With separate admission of air and fuel into cylinder: the injector being placed on a side position of the cylinder
F02F 1/242
Cylinder heads: arrangement of spark plugs or injectors
F02F 3/24
Pistons: having means for guiding gases in cylinders, e.g. for guiding scavenging charge in two-stroke engines