Nissan Motor Company Limited

Other

Unisia Jecs Corporation

Dow Corning Toray Company, Ltd.

Hitachi Powdered Metals Co., Ltd.

Fuji Polymer Industries Co., Ltd.

Atsushi Ehira

Hideaki Kawata

Kei Ishii

Koichiro Hayashi

Kazuyoshi Abe

Yoshimasa Aoki

Kunio Maki

Mikio Naruse

Motoyuki Furukawa

Kazuhiro Ogawa

Akihiro Shibuya

Hirotoshi Oota

Shinichi Takemura

Makoto Kano

Shoji Morita

Akira Fujiki

Takanori Sawada

Masaki Toriumi

Atsushi Ikezawa

Sadayuki Abo

Toru Kakehi

Kouichi Aonuma

Seigo Sato

A heat dissipation assembly in which a heat generator and a heat dissipator are integrated via an electrically insulating and thermally conductive sheet, at least one surface of which a thermally conductive grease is applied to, in which the thermally conductive grease is incompatible with the electrically insulating and thermally conductive sheet. Heat from the heat generator such as a semiconductor device or the like can be effectively dissipated while an electrically insulating condition is maintained over a long period of time.

Heat dissipation assembly and method for producing the same

An insulation sheet is formed by a heat conductive filler of an amount of 70&#x2013;93 mass % in an organopolysiloxane base material. The content of conductive impurities in the insulation sheet is 500 ppm or less. The insulation sheet according to one embodiment is interposed between a semiconductor device and a heat sink.

Insulation sheet and apparatus utilizing the same

The invention relates to an iron-based high-temperature wear-resistant sintered alloy. This alloy contains 3.74-13.36 wt % W, 0.39-5.58 wt % V, 0.2-5.78 wt % Cr, 0.1-0.6 wt % Si, 0.39-1.99 wt % Mn, 0.21-1.18 wt % S, and up to 2.16 wt % C. This alloy includes 20-80 wt % of a first phase and 80-20 wt % of a second phase, each distributed therein, in the form of spots. The first phase contains 3-7 wt % W, up to 1 wt % Cr, 0.1-0.6 wt % Si, 0.2-1 wt % Mn, 0.1-0.6 wt % S, and up to 2.2 wt % C. The first phase may contain 0.5-1.5 wt % V, and in this case the vanadium content of the alloy becomes 0.79-5.88 wt %. The second phase contains 7-15 wt % W, 2-7 wt % V, 1-7 wt % Cr, 0.1-0.6 wt % Si, 0.2-1 wt % Mn, 0.1-0.6 wt % S, and up to 2.2 wt % of C. Each phase contains 0.3-1.6 wt % MnS and a carbide of at least tungsten, which are dispersed therein. The second phase further contains 10-20 areal % tungsten carbide (particle diameter: &gE;1 &mgr;m) dispersed therein. The alloy further contains 0.3-16 wt % MnS grains dispersed in grain boundaries and/or pores. The alloy is greatly improved in wear resistance, while suppressing damage to mating part in contact with the alloy.

High-temperature wear-resistant sintered alloy

The invention relates to a sintered alloy. This sintered alloy includes 3-13.4 wt % of W, 0.4-5.6 wt % or 0.8-5.9 wt % of V, 0.2-5.6 wt % of Cr, 0.1-0.6 wt % or 0.6-5.0 wt % of Si, 0.1-0.6 wt % or 0.2-1.0 wt % of Mn, 0.6-2.2 wt % of C, and a balance of Fe. The sintered alloy includes first and second phase which are distributed therein, in a form of spots, respectively. The second phase is in an amount of from 20 to 80 wt %, based on the total weight of the first and second phases. The first phase contains 3-7 wt % of W, 0.5-1.5 wt % of optional V, up to 1 wt % of Cr, 0.1-0.6 wt % or 0.6-5.0 wt % of Si, 0.1-0.6 wt % or 0.2-1.0 wt % of Mn, up to 2.2 wt % of C, and a balance of Fe. The second phase contains 3-15 wt % of W, 2-7 wt % of V, 1-7 wt % of Cr, 0.1-0.6 wt % or 0.6-5.0 wt % of Si, 0.1-0.6 wt % or 0.2-1.0 wt % of Mn, up to 2.2 wt % of C, and a balance of Fe. When the manganese contents of the first and second phases and the total of the sintered alloy are respectively in a range of from 0.2 to 1.0 wt %, sulfur is respectively contained therein in an amount of from 0.1 to 0.6 wt %. The sintered alloy has wear-resistant at high temperature and good compatibility without damaging mating part that is in contact with the sintered alloy.

A main rocker arm is supported for swinging motion to operate one of the intake and exhaust valves of an internal combustion engine. A high-speed rocker arm is supported on the main rocker arm for swinging motion according to rotation of a high-speed cam rotating in synchronism with engine rotation. The high-speed rocker arm has a slip surface for engagement with the high-speed cam. The high-speed rocker arm is drivingly connected to the main rocker arm for swinging motion in unison with the main rocker arm when the engine is operating at a high speed. The driving connection is released to permit swinging motion of the main rocker arm according to rotation of a low-speed cam independently of the swinging motion of the high-speed rocker arm when the engine is operating at a low speed. The slip surface of the high-speed rocker arm is made of an alloy tool steel having carbide deposited and dispersed to provide a hardness of HRC55 or more to the slip surface. A hard coat is formed through physical vapor deposition on the slip surface of the high-speed rocker arm.

Valve operating apparatus

Growing community of inventors

Hiratsuka, Japan

Atsushi Ehira