Aisin Seiki Kabushiki Kaisha

Ngk Insulators, Inc.

Aisin Seiki Company, Ltd.

Tsutomu Mitsui

Shuhei Ishikawa

Kouichiro Hirosawa

Tomio Oguma

Ken Suzuki

Seiji Yasui

Nobuaki Nakayama

Hiroyuki Takeuchi

Kazutaka Kuwana

Hideyuki Kobayashi

Tadaaki Hashiride

Takashi Hida

Toshio Yoshioka

Takashi Ohmitsu

Tatsumi Hayakawa

Kiichi Yamamoto

Yasuo Koori

A composite material includes an SiC porous ceramic sintered body, which is formed by preliminarily sintering a porous body, having a coefficient of thermal expansion lower than the coefficient of thermal expansion of copper to construct a network therein. A copper alloy impregnating the porous ceramic sintered body includes copper and one or more additive elements which are prepared to impart a coefficient of thermal conductivity of 160 W/mK or higher to the composite material. The additive elements include up to 5% of at least one element selected from Be, Al, Si, Mg, Ti, Ni, Bi, Te, Zn, Pb, Sn, and mish metal, and also contain unavoidable impurities and gas components.

Composite material

Graphite is placed in a case, and the case is set in a furnace. The interior of the furnace is subjected to sintering to produce a porous sintered member of graphite. After that, the case with the porous sintered member therein is taken out of the furnace, and is set in a recess of a press machine. Subsequently, molten metal of metal is poured into the case, and then a punch is inserted into the recess to forcibly press the molten metal in the case downwardly. Open pores of the porous sintered member are infiltrated with the molten metal of the metal by the pressing treatment with the punch.

Heat sink material and method of manufacturing the heat sink material

A mass of graphite is placed into a case, and the case is put into a furnace (step S). The space in the furnace is heated to produce a porous sintered body of graphite (step S). Thereafter, the case with the porous sintered body contained therein is removed from the furnace, and put into a cavity in a press (step S). Then, a molten mass of a metal is poured into the case (step S), and a punch is inserted into the cavity to press the molten metal into the porous sintered body in the case (step S).

Heat sink material

A high-pressure vessel is allowed to be in an initial state, and a first chamber is disposed downward. Copper or copper alloy is placed in the first chamber, and SiC is set in a second chamber. The high-pressure vessel is tightly sealed, and then the inside of the high-pressure vessel is subjected to vacuum suction through a suction pipe. An electric power is applied to a heater to heat and melt the copper or copper alloy in the first chamber. At a stage at which the molten copper in the first chamber arrives at a predetermined temperature, the high-pressure vessel is inverted by 180 degrees to give a state in which SiC is immersed in the molten copper. An impregnating gas is introduced into the high-pressure vessel through a gas inlet pipe to apply a pressure to the inside of the high-pressure vessel. Thus, SiC is impregnated with the molten copper. The high-pressure vessel is inverted by 180 degrees, and then the impregnating gas in the high-pressure vessel is discharged through a gas outlet pipe, simultaneously with which a cooling gas is introduced into the high-pressure vessel through the gas inlet pipe to cool the high-pressure vessel.

Composite material for heat sinks for semiconductor devices and method for producing the same

Composite material for heat sinks for semiconductor devices and method

An antifouling structure in contact with seawater or at least its surface layer is made up of a beryllium copper alloy having a beryllium content lying in the range of 0.2% by weight to 2.8% by weight. While this antifouling structure is immersed in seawater, a beryllium or copper oxide film is formed on the surface layer of the beryllium copper alloy mother material and beryllium or copper ions are liberated from the exposed surface layer of the beryllium copper alloy mother material into seawater. As years go by, the beryllium or copper oxide film peels away from the beryllium copper alloy mother material. Due to indeterminate repetition of such peeling, the liberation of beryllium or copper ions from the exposed surface layer of the beryllium copper alloy mother material into seawater is sustained.

Antifouling structure and method

When a motor/generator is changed over from a motor mode to a generator mode, field current is minimized. In the generator mode, idling is performed until the engine temperature attains a set temperature, after which the field current is supplied. As a result, load upon an engine is lightened immediately after the engine is started and the risk of the engine stalling is eliminated.

Engine generator apparatus and method of operating same

Disclosed are a starter and power generator which starts an engine and which is subsequently driven by the engine to generate power, and a motor used in the starter, in particular, a self-controlled commutatorless motor in which a rotating magnetic field is developed across the stator in accordance with an angle of rotation of the rotor. Normally, output matching means is connected to the three phase windings of the stator, whereby an alternator is defined by the combination of the rotor, the stator and the output matching means. However, in response to a starting command, energizing means is substituted for the output matching means, whereby a combination of the rotor, the stator, timing means and energizing means form a commutatorless motor. Thus, subsequent to starting the engine, the motor is driven by the engine to generate power. When the arrangement functions as a commutatorless motor and when a single phase excitation is employed for a lap winding of plurality of phases to define the individual magnetic poles of the stator, a forced starting operation is achieved by causing an energization of at least one of the phases of the stator coils if the starting command is issued at a timing where the energization of all the phases of the stator coils is interrupted.

Starter and power generator and associated motor

In a clutch pressure control apparatus wherein clutch engagement pressure is automatically controlled according to engine speed based on a first function, engagement shock may occur due to an excessive clutch pressure in a case where the acceleration pedal is depressed with the transmission being placed in a NEUTRAL position and being shifted to a running position. To solve this problem, the apparatus comprises a controller including a second function. When an actual engine speed at the initial clutch engagement exceeds an allowable engine speed, clutch pressure is first set to a temporary low value not exceeding the allowable engine speed, and then while incorporating the second function, is allowed to approach that value to be determined according to actual engine speed by the first function. The second function is of clutch pressure and time, incorporating accelerator stroke as a parameter, or such that is provides an auxiliary parameter defined by accelerator stroke to modify an actual engine speed signal to be inputted to the first function.

Clutch pressure control apparatus

The present invention relates to an oil pressure control apparatus which comprises an oil pressure pump, a pressure regulating valve in a first oil line and a drain valve in a second oil line. A supply valve is provided upstream of the drain valve in the second line for minimizing the oil pressure loss as much as possible, and for providing a short response time upon actuation.

Oil pressure control apparatus

System is provided for controlling the pressure with which a clutch is engaged, with the throttle opening and the rotational speed of a driven shaft of the clutch. A microprocessor reads a throttle opening and the rotational speed of the driven shaft of the clutch at a time interval of 0.4 sec, and accesses a particular group of controlling data which control the clutch engagement and which are grouped together as a function of a time lapse l as well as the read values of these parameters. During the interval of 0.4 sec, the microprocessor sequentially outputs the controlling data of the particular group with a time subinterval of 0.05 sec. The system detects a difference between the last data of a preceding particular group and the first data of a subsequent particular group at the renewal of the data group and then corrects subsequent data for controlling clutch control pressure so as to smooth the change of the clutch control pressure.

Automatic clutch control system

System is provided for controlling the pressure with which a clutch is engaged, with the throttle opening and the rotational speed of a driven shaft of the clutch. A microprocessor reads a throttle opening and the rotational speed of the driven shaft of the clutch at a time interval of 0.4 sec, and accesses a particular group of controlling data which control the clutch engagement and which are grouped together as a function of a time lapse l as well as the read values of these parameters. During the interval of 0.4 sec, the microprocessor sequentially outputs the controlling data of the particular group with a time subinterval of 0.05 sec. When a temporary clutch activation is instructed, the microprocessor changes the length of the subinterval from 0.05 to 0.1 sec, and also changes the time interval l to 0.8 sec. At the initiation of the clutch engagement, a group of controlling data is selected which is to be assigned to a first interval l=0 corresponding to the deceleration of the clutch drive shaft. After the termination of the interval l=0, another group of controlling data is selected which corresponds to the throttle opening, the rotational speed of the driven shaft and the value of l.

A system is provided which controls the pressure with which a clutch engages, utilizing a slip rate of the clutch which is equal to the ratio of the rotational speed of the output shaft to the rotational speed of the drive shaft thereof as a main parameter. A microprocessor reads a throttle opening and the slip rate at a time interval of 0.4 sec from the initiation of the clutch engagement, and accesses a particular group of clutch engagement controlling data which correspond to the time l elapsed and to these parameters. The controlling signals of the particular group are sequentially outputted to the clutch energizing device at a subinterval of 0.05 sec during the time interval of 0.4 sec. The interval changes from l=0 to l=8 at maximum, from the initiation to the completion of the clutch engagement. Each interval l=0 to l=8 corresponds to 0.4 sec. Whenever a temporary clutch activation is instructed, the microprocessor increases the subinterval of 0.05 sec to 0.1 sec and the time interval l to 0.8 sec. The value of l is incremented by one after a time length of either 0.4 or 0.8 sec elapses.

System is provided for controlling the pressure with which a clutch is engaged, with a slip rate e of the clutch, which is equal to the ratio of the rotational speed of a drive shaft thereof, as a main parameter. A microprocessor reads a throttle opening and the slip rate e from the initiation of engagement of the clutch at a time interval of 0.4 sec, and accesses a particular group of controlling data which control the clutch engagement and which are grouped together as a function of a time lapse l as well as the read values of these parameters. During the interval of 0.4 sec, the microprocessor sequentially outputs the controlling data of the particular group with a time subinterval of 0.05 sec. The time interval includes subintervals corresponding to l=0 to l=8 at maximum, from the initiation to the completion of the clutch engagement. Each subinterval l=0 to l=8 spans 0.4 sec. When a temporary clutch activation is instructed, the microprocessor changes the length of the subinterval from 0.05 to 0.1 sec, and also changes the time interval l to 0.8 sec. When the slip rate e is low at the initiation of the clutch engagement, a group of controlling data is selected which is to be assigned to a first subinterval l=0 corresponding to the deceleration of the clutch drive shaft.

Automatic clutch control to reduce shocks to a vehicle during a rapid switching of a shift lever between its drive D and reverse R positions. The shift lever position and the direction of movement of the vehicle are detected by means of a switch and an electrical circuit. A microprocessor delays the initiation of the clutch engagement by a given time as compared with the clutch engagement occurring when the vehicle is at rest, if the shift lever position is in contra-distinction to the direction of movement of the vehicle, namely, when the shift lever is in its drive D position while the vehicle is moving backward or when the shift lever is in its reverse R position while the vehicle is moving forward.

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Chiryu, Japan

Tsutomu Mitsui