Toyota Jidosha Kabushiki Kaisha

Teikoku Piston Ring Co., Ltd.

Teipi Industry Co., Ltd.

Central Motor Wheel Co., Ltd.

Toshihiro Takami

Satoshi Yamada

Nobuyuki Yamashita

Giichiro Saito

Noritaka Miyamoto

Takashi Sato

Masaki Hirano

Masami Horigome

Kouhei Shibata

Toshihiro Mihara

Mitsuhiro Karaki

Takeshi Tsukahara

Yukinori Ohta

Kouhei Hori

Makoto Fujita

Yasuhiro Ikuta

Isao Katou

Masahiro Isobe

Kazunari Takenaka

Yoshio Naruse

Hirofumi Michioka

Takashi Kurauchi

Junichi Matsudaira

Ikuo Suzuki

Manabu Tsukimoto

Norihiko Tomioka

Hiroshi Muraki

Shunya Hattori

Kiyoharu Oizumi

Koichiro Sasada

Masamitu Kenmochi

Kunio Kumagai

An MMC cylinder liner comprises an inner tubular portion and an outer tubular portion. The inner tubular portion includes a metal matrix composite formed of a compact impregnated with an Al&#x2014;Si alloy wherein the compact is made of a reinforcing material. The outer tubular portion is formed of the Al&#x2014;Si alloy. The Si concentration of the Al&#x2014;Si alloy impregnated into the compact of the inner tubular portion is different from the Si concentration of the Al&#x2014;Si alloy of the outer tubular portion.

MMC cylinder liner and method for producing the same

A cylinder liner has an upper portion and a lower portion with respect to an axial direction of the cylinder liner. A high thermal conductive film is provided on an outer circumferential surface of the upper portion. A low thermal conductive film is provided on an outer circumferential surface of the lower portion. The cylinder liner reduces temperature difference of a cylinder along its axial direction.

Cylinder liner and engine

A cylinder liner for insert casting used in a cylinder block is provided. The cylinder liner includes an outer circumferential surface having a plurality of projections. Each projection has a constricted shape. A film of a metal material is formed on the outer circumferential surface and the surfaces of the projections. As a result, the cylinder liner ensures sufficient bond strength with the casting material of a cylinder block, and sufficient thermal conductivity with the cylinder block.

A cylinder lineris enveloped in a cylinder block through insert casting. The cylinder linerincludes a cylinder liner bodyand a metal coating layerformed on the bodythrough a cold spraying method. Since the metal coating layeris formed in a non-molten and oxygen free state, few oxygen films or oxygen layers are formed on the surface of or in the interior of the metal coating layer. Thus, the thermal conductivity of the metal coating layeris sufficiently high. As a result, the thermal conductivity from the metal coating layerto the cylinder block is sufficiently high.

Component for insert casting, cylinder block, and method for manufacturing cylinder liner

A cylinder liner has an outer circumferential surface on which a film is formed. The film functions to form gaps between the cylinder block and the cylinder liner. Alternatively, the film functions to reduce adhesion of the cylinder liner to the cylinder block. The cylinder liner suppresses excessive decreases in the temperature of a cylinder.

Cylinder liner and method for manufacturing the same

A cylinder liner for insert casting used in a cylinder block is disclosed. The cylinder liner has an outer circumferential surface, and upper, middle, and lower portions with respect to an axial direction of the cylinder liner. A high thermal conductive film is formed in a section of the outer circumferential surface that corresponds to the upper portion, and a low thermal conductive film is formed in a section of the outer circumferential surface that corresponds to the lower portion. The high thermal conductive film and the low thermal conductive film are laminated in a section of the outer circumferential surface that corresponds to the middle portion, thereby forming a laminated film portion. As a result, temperature difference along the axial direction of the cylinder is reduced.

A cylinder liner for an engine cylinder block. A roughening process is performed only on an upper region of the outer surface of the cylinder liner. This increases adhesiveness with a sprayed layer at the upper region compared to a lower region of the liner outer surface. Therefore, difference in thermal conductance is produced in the axial direction of the cylinder liner. This maintains the wall temperature of the cylinder bore in an appropriate temperature range. Even if adhesiveness at the lower region of the liner outer surface is low, bottleneck-shaped projections are distributed on the liner outer surface. Thus, the bonding strength between the cylinder liner and the sprayed layer and the cylinder liner and the cylinder block via the sprayed layer is sufficient. This maintains the roundness of the cylinder bore and prevents fuel efficiency from being lowered by exhaust gas loss and mechanical loss.

Cylinder liner, cylinder block, and method for manufacturing cylinder liner

A liner outer surface is coated by a sprayed layer or a heterogeneous metal layer including a base metal phase and dispersed metal phases. During casting, liquid metal enters the sprayed layer from the dispersed metal phases and solidifies in a virtual vegetation root state. The surface of the cylinder block is thus rigidly fixed to the surface of the cylinder liner. In this case, a strong bonding force is produced between the cylinder block and the cylinder liner and high thermal conductivity is obtained compared to the prior art in which the liquid metal merely contacts a surface layer.

Insert casting component, cylinder block, method for forming coating on insert casting component, and method for manufacturing cylinder block

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

A cylinder block of an internal combustion engine has a portion between a cylinder block body and a cylinder liner which is sealed against a coolant so as to prevent the coolant from entering a crank case. The cylinder block body is made of a first material. The cylinder liner is cast in the cylinder block body. The cylinder liner is made of a second material different from the first material. The cylinder liner has an engaging portion contacting a portion of the cylinder block body from outside in a radial direction of the cylinder liner.

Internal combustion engine cylinder block and manufacturing method

A method for producing a cylinder block for an internal combustion engine having a sealing surface on which a gasket is mounted, a number of cylinder bores arranged side by side, each cylinder bore opening to the sealing surface, a water jacket surrounding the cylinder bores, and a cooling passage located between the cylinder bores. A liner assembly is first formed by joining a set of cylinder liners with each other side by side. At least one of the liners has a recess that forms a space located between adjacent cylinder liners when the liners are joined. A cast body having the water jacket is molded by pouring molten metal into a mold after the liner assembly is positioned in the mold. The molten metal is prevented from entering the space during the molding process. The space is communicated with the water jacket to form the cooling passage.

Process for producing engine cylinder blocks

A method of manufacturing cylinder blocks. A cylinder block includes cylinder liners, the number of which corresponds to the number of cylinders in the engine, and a block body molded integrally with and about the cylinder liners. A liner assembly is formed by aligning cylinders in a single row and connecting the adjacent cylinder liners. A variable section provided between each pair of cylinders enables the distance between the axes of the outer cylindrical surface of each cylinder liner to be varied. The block body is molded by first arranging the liner assembly in a mold. Molten metal is then charged into the mold. When the metal solidifies, the block body is formed encompassing the liner assembly. A reference point on the block body is used to machine the inner cylindrical surfaces and form the cylinder bores.

Method and apparatus for manufacturing cylinder blocks

An upper support for a radiator wherein a body bracket and a radiator bracket are joined together by means of a rubber member which has at least one rubber prop on each side of a vertical bracket axis and has a cavity defined between the right and left rubber props. In the state before radiator assembly and also in the assembled state, the rubber props are inclined upwardly in a direction from the body bracket toward the radiator bracket. In this structure of the radiator upper support, a tensile force always works on the rubber props and accordingly there is no wide fluctuation in the dynamic spring constant. Thus the range of the cavity dimensions which effectively contribute to suppression of idle vibration and internal car noise can be so enlarged that, when there are large tolerances in radiator assembly, the dynamic spring constant of the vibrational system involved can remain in the effective range of the dynamic spring constants for suppression of the vibration, thereby minimizing the idle vibration and the internal car noise.

Upper support for a radiator

A sealing device for a timing belt cover and an engine mount bracket comprises a rib formed on said engine mount bracket and a gasket having a lip of C-shaped section and a fixed portion continuous from said lip. The fixed portion of the gasket is attached to a portion of the timing belt cover surrounding an opening provided in said timing belt cover and said lip of C-shaped section of the gasket is contact with said rib of the engine mount bracket. Since the gasket is made of an elastic material other than sponge, e.g. rubber, it does not undergo a permanent deformation and causes no gap between said lip and said rib. Besides, since said lip of C-shaped section is easily deformed, there is no likelihood of an excessive load being applied to said timing belt cover.

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Toyota, Japan

Toshihiro Takami