Nichias Corporation

Akihiro Yoshimura

Kazuaki Nishio

Junya Sato

Yoshifumi Fujita

A cylinder bore wall thermal it includes bore wall insulating sections provided for each of bore walls of cylinder bores and for insulating a wall surface on the cylinder bore side of the groove-like cooling water channel and a supporting section to which the bore wall insulating sections are framed. The bore wall insulating, sections include rubber members for covering the wall surface on the cylinder bore side of the groove-like cooling water channel, rear surface pressing members provided on rear surface sides of the rubber members and for pressing the entire rubber members toward the wall surface on the cylinder bore side of the groove-like cooling water channel from the rear side, and elastic members that urge the rear surface pressing members to press the rubber members toward the wall surface on the cylinder bore side of the groove-like cooling water channel.

Cylinder bore wall thermal insulator, internal combustion engine, and automobile

A cylinder bore wall thermal insulator includes a base member made of synthetic resin and having a shape conforming to a shape of the groove-like cooling water channel in a setting position of the thermal insulator, an opening for heat-sensitive expanding rubber swelling for heat-sensitive expanding rubber disposed on a rear surface side to pass through a base member during heat-sensitive expansion being formed in a position opposed to an insulating part of a cylinder bore wall, heat-sensitive expanding rubber disposed on the rear surface side of the base member and covering the opening for heat-sensitive expanding rubber swelling, and a rear-surface metal plate covering the rear surface side of the heat-sensitive expanding rubber, fixed to the base member, and holding an outer edge portion of the heat-sensitive expanding rubber between the rear-surface metal plate and the base member to thereby fix the heat-sensitive expanding rubber to the base member. An urging member for urging the heat-sensitive expanding rubber after the heat-sensitive expansion toward the cylinder bore wall is attached to the rear-surface metal plate. According to the present invention, it is possible to provide a thermal insulator that has high adhesion to a wall surface on a cylinder bore side of a groove-like cooling water channel, less easily causes positional deviation in the groove-like cooling water channel, and is easily manufactured.

A cylinder bore wall thermal insulator includes one or more rubber sections in contact with a wall surface on the cylinder bore side of a groove-like cooling water channel, a base section having a shape conforming to a shape of a one-side half of the groove-like cooling water channel, the one or more rubber sections or one or more members to which the one or more rubber sections are fixed being fixed to the base section, and one or more elastic members for urging the entire one or more rubber sections to be pressed from a rear surface side toward the wall surface on the cylinder bore side of the groove-like cooling water channel. The thermal insulator includes a vertical wall near a boundary of each bore section of the base section and on a near side of the boundary of each bore section of the base section.

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

A cylinder bore wall insulating member has a contact surface that comes in contact with a wall surface of a cylinder bore wall that forms a cylinder block of an internal combustion engine and defines a groove-like coolant passage. An internal combustion engine in which the cylinder bore wall has a uniform temperature may be obtained using the insulating member.

Growing community of inventors

Hamamatsu, Japan

Akihiro Yoshimura