Toyota Jidosha Kabushiki Kaisha

Nichias Corporation

Teikoku Piston Ring Co., Ltd.

Teipi Industry Co., Ltd.

Takashi Kurauchi

Yoshihiro Kawasaki

Toshihiro Takami

Yoshifumi Fujita

Giichiro Saito

Kazuaki Nishio

Tetsu Yamada

Masayuki Nakamura

Kazunari Takenaka

Hirofumi Michioka

Isao Katou

Shunya Hattori

Kiyoharu Oizumi

Shinpei Yamashita

Takayuki Suzuki

Satoshi Okawa

Norihiko Tomioka

Hiroshi Muraki

Tomoatsu Ooyasu

A cylinder bore wall thermal insulator is provided to a middle-lower part of a groove-like coolant passage of a cylinder block included in an internal combustion engine that includes a plurality of cylinder bores, and insulates part of a cylinder bore wall, the cylinder bore wall thermal insulator including a rubber member that comes in contact with part of a cylinder bore-side wall surface of the middle-lower part of the groove-like coolant passage that covers one cylinder bore, or covers two or more cylinder bores, a metal base member on which the rubber member is secured, and an elastic member that is provided to the metal base member, and biases the metal base member so that the metal base member presses the rubber member against the cylinder bore-side wall surface of the middle-lower part of the groove-like coolant passage, one or more elastic members being provided to each bore-covering part of the metal base member. The cylinder bore wall thermal insulator can selectively insulate an area of the cylinder bore wall that requires thermal insulation, and is rarely displaced due to vibrations or the flow of the coolant.

Cylinder bore wall heat insulation device, internal combustion engine and vehicle

A cylinder liner for insert casting and a method for manufacturing the cylinder liner are provided. The cylinder liner and the method are applied to cylinder blocks and improve the adherence and the bonding strength with a cylinder block material in a favorable manner. The cylinder liner satisfies the following requirements: (i) the height of projectionsP is in a range between 0.5 mm and 1.0 mm, inclusive; (ii) the number of the projectionsP is in a range between 5 and 60, inclusive, per cmon the outer circumferential surface; (iii) the area ratio of regions each encircled by a contour line of a height of 0.4 mm is in a range between 10% and 50%, inclusive; (iv) the area ratio of regions each encircled by a contour line of a height of 0.2 mm is in a range between 20% and 55%, inclusive; (v) the region each encircled by a contour line of the height of 0.4 are independent from each other; and (vi) the area of the regions each encircled by a contour line of the height of 0.4 mm is in a range between 0.2 mmand 3.0 mm, inclusive.

Cylinder liner for insert casting and method for manufacturing thereof

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Toyota, Japan

Takashi Kurauchi