Mazda Motor Corporation

Takashi Ikai

Kazuo Ichikawa

Osamu Aoki

Yoshiyuki Koga

Kouichi Nakano

Keiji Araki

Hiroyuki Yamashita

Masaki Fukuma

Masami Nishida

Masatoshi Seto

Hiroaki Deguchi

Kazuaki Narahara

Hidefumi Fujimoto

Tatsuya Tanaka

Akira Asai

Yoshio Tanita

Susumu Masuyama

Toru Kurisu

Yoshitomo Takahashi

Shinichi Fujimaki

Yusuke Nakao

Shingo Kai

Hirokazu Nakahashi

Hiroaki Sugiura

Hiroshi Enomoto

Masunori Kanda

Eiichi Yanagida

Disclosed is an engine piston structure including an outer peripheral portion () formed along an outer shape of a piston (), and having a predetermined thickness, a pair of piston pin supporters () having peripheral walls () having a predetermined thickness, and couplers () each coupling the pair of the piston pin supporters () to the outer peripheral portion (). The outer peripheral portion () and the peripheral walls () of the piston pin supporters () are solid. Each of the coupler () is porous. The outer peripheral portion (), the piston pin supporters (), and the couplers () are made of a metal material and are integrally formed together.

Piston structure for engine

An object of the present invention is to, while forming a heat insulating layer on a squish area surface of a top surface of a piston main body, prevent generation of large cracks on the heat insulating layer and suppress damages and peeling of the heat insulating layer. To achieve this object, in the present invention, pressure is applied to a heat insulating layer provided on a top surface of a piston main body, that is, a pressing stress is applied to the heat insulating layer in advance.

Method of producing piston for engine

An object of the present invention is to, while forming a heat insulating layer on a squish area surface of a top surface of a piston main body, prevent generation of large cracks on the heat insulating layer and suppress damages and peeling of the heat insulating layer. To achieve this object, in the present invention, a heat insulating layer on a squish area surface of a top surface of a piston main body is made thinner than a heat insulating layer on a cavity surface of the top surface of the piston main body.

Heat insulation structure of combustion chamber of engine

A direct injection engine includes an ignition assistance section applying energy to fuel injected into a cylinder using an injector to assist auto-ignition combustion of the fuel when the engine is within an auto-ignition combustion operation range. A start time of fuel injection is set within a period from a terminal stage of a compression stroke to a compression top dead center. The energy is applied to the fuel injected into the cylinder in a period from start of the fuel injection to an initial stage of an expansion stroke such that a time of a specific crank angle when an increase rate of in-cylinder pressure, which is a ratio of a change in the in-cylinder pressure to a change in a crank angle in motoring the engine, reaches a negative maximum value overlaps a combustion period when a combustion mass percentage of the fuel ranges from 10% to 90%.

Direct injection gasoline engine and method of controlling the direct injection gasoline engine

An intake valve or an exhaust valve is lifted through a swingable cam by the rotation of a rotatable cam formed in the cam shaft. A surface at which the swingable cam abuts with the rotatable cam is tapered in the axial direction in which said cam shaft extends, and the valve shift timing is changed by transferring the cam shaft, that is, the rotatable cam in the axial direction in which said cam shaft extends. The power transmitting member such as a helical gear to be rotated with the output shaft of the engine is engaged with the cam shaft through a helical spline. The power transmitting member is so arranged as to be unmovable in the axial direction in which said cam shaft extends. The rotational phase of the rotatable cam relative to the output shaft of the engine is changed by displacement of the cam shaft relative to the power transmitting member in the axial direction in which said cam shaft extends.

System for controlling valve shift timing of an engine

Growing community of inventors

Higashihiroshima, Japan

Takashi Ikai