Denso Corporation

Other

Nippon Soken, Inc.

Hitachi Powdered Metals Co., Ltd.

Yuuichi Aoki

Junichi Ohguchi

Hiroyasu Sakamoto

Yasuo Tabuchi

Mikio Matsuda

Toshihiro Hayashi

Manabu Saiki

Hiroyasu Morikawa

Arinori Shimizu

Hirokazu Hashimoto

Yukihisa Takeuchi

Eiichi Torigoe

Naoki Hakamada

Yasumasa Hagiwara

Kei Ishii

Youichi Murakami

Yoshihiro Tanimura

Tadayuki Tsutsui

Katsuya Ishii

Takuo Sakai

Naoto Agata

Kouji Yamada

Naoji Konaga

Toshitada Nagasawa

Kazuo Itoh

Yoshihiko Matsusaka

Shin-ichi Matsuoka

Takashi Honda

Shinichi Fujiyama

Means for a thermally conductive and electrically insulating materialcontaining an AlN crystalmainly comprising AlN, and a production method thereof. In production, a molten aluminum layer is formed on an AlN substratewith at least its surface comprising AlN in an atmosphere of a non-oxidizing gas, and the molten aluminum layer is then heated in an atmosphere of Ngas to form an AlN crystalwhich mainly comprises an AlN layer. The means are also a thermally conductive and electrically insulating material having an AlN crystal and an Al gradient layer, and a production method thereof. In production, a heating step of forming a molten aluminum layeron the AlN layerand heating it in an atmosphere of Ngas is repeated at least twice or more. At this time, the amount of the Ngas dissolved in the molten aluminum layer is decreased as the heating step is repeated.

Thermally conductive, electrically insulating material and production method thereof

In a heat exchanger, a core portion includes a plurality of plate fins each shaped like a flat plate and a plurality of tubes in which a fluid flows and each of which is inserted into each of the plate fins to be mechanically bonded thereto. Further, an end portion in a longitudinal direction of each of the tubes is bonded to a header plate which constructs a part of a header tank. The manufacturing method for this heat exchanger includes inserting the tube into the plate fins; expanding the tube to attach the plate fins; connect the tube into the header plate; and vibrate the tube with respect to the plate while applying a load to the tube in the direction of the header plate.

Manufacturing method for a heat exchanger

In an ultrasonic joining method for joining a flange portion of a first member to a portion of a second member, a first horn and a second horn are arranged on the flange portion on a side opposite to the second member, and the first horn is vibrated in a condition that the second horn is biased against the first horn and the first horn and the second horn are pressed against the flange portion such that the flange portion is vibrated while being pressed against the portion of the second member. Because the first horn is vibrated in a condition that the first horn and the second horn are pressed against each other at press-contact portions thereof, vibration of the first horn is transferred to the second horn through the press-contact portions.

Ultrasonic flange joining method

An ultrasonic welding method and an ultrasonic welding device are provided to join a first member having a substantial pipe shape and a second member at a joining surface by pressure-applying and vibration-exciting. In an arranging process, each of a first horn member and a second horn member is slantways arranged in such a manner that a part of a pressure-applying surface thereof which is nearer to a division surface thereof becomes nearer to the joining surface, according to deformation in a joining process. Thus, in the joining process, the pressure-applying surfaces are disposed substantially parallel to the joining surface due to a pressure-applying reaction force, so that the first horn member and the second horn member can be pressed against each other at the division surfaces thereof.

Ultrasonic welding method, ultrasonic welding device and pipe joined by the same

When a weld area of weld surface between a flange portionof a pipeand a flange portionof a pipe connection memberis S and total energy consumed on the weld surface is Et, ultrasonic welding is carried out to produce said ultrasonic weld assembly in such a manner that an energy density E defined as the quotient obtained by dividing the total energy Et by the weld area S satisfies the relation 26.69e&#x3c;E&#x3c;240.9ewith a surface pressure P on the weld surfaces of the flange portionand the flange portion. Preferably, ultrasonic welding is carried out in such a manner that the energy density E satisfies the relation 133.45e&#x3c;E&#x3c;240.9e.

Production method of ultrasonic weld assembly

An inexpensive mechanical fuse having a high fatigue limit ratio and high rupture reliability, and superior in forming performance, and a method of manufacturing the same are presented. The mechanical fuse is composed of Fe-based sintered alloy, and comprises an inner rimfixed to one power transmission shaft, an outer rimfixed to the other power transmission shaft, and plural armsfor linking the inner rimand outer rim, which are formed integrally. The armsinclude rupture portionswhich are ruptured when exposed to an overload torque. By treating in steam, an iron oxide phase is formed in the surface layer and pore inner wall. The iron oxide phase is effective to form round pores and lower the notch sensitivity. As a result, the fatigue strength and fatigue limit ratio are enhanced.

Mechanical fuse and method of manufacturing the same

Two-step protruding portions are provided in a cover of a pulley for hooking the cover on the pulley. When a bridging part is broken, a driving-unit-side portion of the bridging part is outwardly displaced in a rotation axis direction of the pulley. The first-step protruding portion of the cover thereby slips out from a hooking state. However, after the driving-unit-side portion mounts on the driven-unit-side portion, no further force acts outwardly in the rotation axis direction. As a result, the second-step protruding portion of the cover is hooked on the pulley, so that the cover can be fixed to the pulley. This results in inhibiting broken bridging parts or dampers from dispersing.

Power transmission system

A friction clutch such as an electromagnetic clutch, in which a driving friction surface is formed on a rotor integral with a rotationally driven pulley and a driven friction surface in opposed relation to the driving friction surface is formed on an intermediate member pivotally mounted on a boss by a pin, is disclosed. When the rotor is in rotation, the armature portion of the intermediate member is attracted by an initial energizing means for generating a comparatively small force such as an electromagnetic coil so that the intermediate member is rotated around the pin. When the friction surface of the intermediate member is lightly pressed against the friction surface of the rotor, the friction force exerted tangentially to the contact surface causes the intermediate member to rotate further around the pin and generate a large force along the normal. Thus, the friction force is increased thereby making it possible to transmit a large power from the rotor to the boss through the intermediate member.

Friction clutch

A torque limiting mechanism includes an axial space formed in a cylindrical wall of a pulley, and a pin protruding and extending from a back surface of a discharge disc. The pin is inserted into the axial space, and a rubber damper is installed between the inner surface of the axial space and the pin. When torque difference between the pulley and the discharge disc exceeds a threshold, a root portion of the pin is broken to separate the discharge disc from the pulley, thereby interrupting rotation transmission from the pulley to the discharge disc.

Rotation transmitter having torque limiting mechanism

An electromagnetic coil is fixed in a rotor through an insulation member. A slip-ring rotating with a rotor and a brush supplying electric current to the slip-ring are disposed radially inside a boss portion of a compressor housing. The slip ring is attached to the rotor through a slip-ring supporter, and the brush is supported by the boss portion through a brush supporter. The brush supporter includes a cylindrical sleeve radially inside the brush, which extends axially outwardly farther than a slide surface between the slip-ring and the brush.

Rotating coil electromagnetic

An electromagnetic coil is disposed in a rotor, and electrically insulated from the rotor. A slip-ring is supported by a rotor through a slip-ring supporter, and rotates with the rotor. A brush is supported by a compressor boss portion through a brush supporter, and supplies an electric current to the slip-ring. A diode is disposed in the brush supporter or the slip-ring supporter, and absorbs a surge voltage which is inducted when said electromagnetic coil is disenergized.

Rotating coil electromagnetic clutch

An electromagnetic clutch has an armature, a rotor housing accommodating a stator housing and an exciting coil having negative and positive terminals. A passage is formed to extend from an outer peripheral surface of the stator housing to the negative terminal and the positive terminal. The passage is filled with a conductive metal member having a melting point lower than that of the stator housing between the outer surface of the stator housing and the negative terminal. When frictional heat generated between the armature and the rotor housing exceeds a preset value, the metal member melts and flows to the positive terminal, thereby short-circuiting the coil. As a result, a fuse between a power source and the clutch is fused, thereby turning off the clutch. Therefore, the clutch does not need to have a thermal fuse therein and is reduced in size without increasing power consumption.

Electromagnetic clutch

A power transmission apparatus which can function as a torque limiter during an overload condition. A Belleville spring is provided for generating mutual frictional engagement in areas between a flange part integral to an inner holder member, a washer, arc shaped projections of a flange part of a hub and a washer. As a result, during a normal condition of a compressor, the rotating movement of the inner holder member located adjacent to the rotating movement source is transmitted via the frictional engagement mechanism to a hub and then to a rotating shaft. Contrary to this, during an overloaded condition, a slippage is generated in the area between the washer and the arc shaped projections of the flange part of the hub as a frictional engaging area of a lower coefficient of friction. This slippage causes the washer to sink into the recess of the hub, which causes the washer to be displaced in the direction of the axis of the rotating shaft, which causes the pressing force to be reduced in the Belleville spring, resulting in a free rotating movement of the flange part.

Power transmission apparatus

In order to reduce its size of a coil-rotation type electromagnetic clutch in an axial direction and to prolong the life of its brush, a sliding current supply mechanism, which has slip rings and slidable brushes which contact the slip rings, is located inside an inner circumference of a housing boss of a compressor. The current is supplied to an electromagnetic coil via the sliding current supply mechanism. Since the sliding current supply mechanism is located in the boss, a current supply passage is formed without increasing the size of the clutch in axial direction. Thus the installation of the electromagnetic clutch in the engine room is facilitated. Furthermore, since the sliding current supply mechanism is located near the rotational center of the clutch, the life of the brush is prolonged due to the small peripheral velocity of the brush.

Electromagnetic clutch with slip ring and brush

In order to improve the magnetic efficiency and the assembling productivity of a coil-rotation type electromagnetic clutch, an electromagnetic coil is located in a ring-shaped recess of a rotor, and friction surfaces facing an armature are formed on both ends of an inner cylindrical portion and an outer cylindrical portion. A friction plate is located in the recess and closer to the armature than the electromagnetic coil. A magnetic shield is located at a place corresponding to the middle of the friction plate in the radial direction. The friction plate is fixed to the ends of the inner cylindrical portion and the outer cylindrical portion by securing protrusions of the friction plate to grooves formed on the inner cylindrical portion and the outer cylindrical portion.

Growing community of inventors

Chita-gun, Japan

Yuuichi Aoki