Koyashiki
Hidehiko Koyashiki, Gunma-Ken JP
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20090255488 | Cooling device for engine - A cooling device for an engine that can raise the temperature of cooling water within a short period of time during the warm-up operation and allows a simple structure. The cooling device has a radiator circulation flow channel for circulation via an engine, a radiator, and a thermostat; a heater circulation flow channel for circulation via the engine, a heater core, and the thermostat; a bypass circulation flow channel for circulation via the engine and the thermostat; an electronically controlled valve; and a pump. The radiator circulation flow channel, heater circulation flow channel, and bypass circulation flow channel merge in the thermostat and form a common flow channel between the thermostat and the engine. The pump is provided in the common flow channel. At the start of the warm-up period and during the warm-up operation, the circulation in the radiator circulation flow channel is substantially stopped by the thermostat, cooling water circulation is actuated in the bypass circulation flow channel, and an opening degree of the electronically controlled valve is gradually increased from a minimum as the cooling water temperature rises. At the end of the warm-up period, circulation is actuated in the radiator circulation flow channel and substantially stopped in the bypass circulation flow channel. | 10-15-2009 |
20120024243 | Engine cooling apparatus - The present invention provides an engine cooling apparatus that is capable of suppressing cavitation in a high rotation region while achieving an increase in a circulation flow rate of cooling water in a low/medium rotation region. The engine cooling apparatus includes: a main cooling water circuit that circulates the cooling water between an engine and a radiator; a branch portion provided between the engine and the radiator; a thermostat; temperature detecting means; a first bypass flow passage; a second bypass flow passage that connects the engine to the branch portion; a control valve; a bypass convergence portion; a water pump; valve opening control means; and engine rotation speed detecting means. | 02-02-2012 |
Hidehiko Koyashiki, Isesaki-Shi JP
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20140007965 | CONTROL VALVE - A control valve have a main flow passage; a flow passage sectional area adjustment spool; a downstream side branch flow passage; a communicating flow passage; a flow passage opening/closing valve; a flow passage opening/closing spool; and an upstream side branch flow passage. The flow passage opening/closing valve cuts off the downstream side branch flow passage from the communicating flow passage in a low rotation region of an engine. In a medium rotation region, the flow passage opening/closing valve connects the downstream side branch flow passage to the communicating flow passage and the flow passage opening/closing spool allows the communicating flow passage to communicate. In a high rotation region, the flow passage opening/closing spool blocks the communicating flow passage. | 01-09-2014 |
20140060476 | ENGINE LUBRICATION CONTROL SYSTEM - The present invention provides an engine lubrication control system including an engine, an oil pump which is driven by the engine, an oil circuit which extends downstream from the oil pump, and a plurality of oil branch supply paths which branch from the oil circuit and supply oil to each part of the engine. An electronically-controlled first hydraulic control valve which controls, in a stepwise manner, a discharge pressure of the oil pump relative to a speed of the engine is disposed on the oil circuit, a hydraulically-driven second hydraulic control valve is disposed on at least one of the plurality of oil branch supply paths, and a downstream hydraulic pressure of the second hydraulic control valve is controlled to be lower than a downstream hydraulic pressure of the first hydraulic control valve of the oil circuit at least across a predetermined engine speed range. | 03-06-2014 |
20140060477 | ENGINE LUBRICATION CONTROL SYSTEM - The present invention provides an engine lubrication control system including an engine, an oil pump which is driven by the engine, an oil circuit which extends downstream from the oil pump, and a plurality of oil branch supply paths which branch from the oil circuit and supply oil to each part of the engine. An electronically-controlled first hydraulic control valve which controls, in a stepwise manner, a discharge pressure of the oil pump relative to a speed of the engine is disposed on the oil circuit, a hydraulically-driven second hydraulic control valve is disposed on at least one of the plurality of oil branch supply paths, and a downstream hydraulic pressure of the second hydraulic control valve is controlled to be lower than a downstream hydraulic pressure of the first hydraulic control valve of the oil circuit at least across a predetermined engine speed range. | 03-06-2014 |
Keiichiro Koyashiki, Yamaguchi JP
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20090082512 | Material for fuel system parts - A material for fuel system parts is provided, which is excellent in alcohol gasoline permeation-preventing property and impact resistance and suitably usable for the parts attached to a fuel tank or a fuel hose. A material for fuel system parts, comprising a polyamide resin composition which comprises (A) a polyamide resin, (B) a layered silicate, (C) a polyolefin and (D) an impact resistant material and in which (A) the polyamide resin having dispersed therein (B) the layered silicate forms a matrix phase and at the same time, a dispersion phase of a core-shell particle structure with the core being (C) the polyolefin and the shell being (D) the impact resistant material is present in the matrix. | 03-26-2009 |
Keniichirou Koyashiki, Yamaguchi JP
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20120068125 | CONDUCTIVE RESIN COMPOSITION - There is disclosed a conductive resin composition, comprising: (a) a resin component, and (b) a fine carbon fiber dispersed in the resin component, wherein a graphite-net plane consisting solely of carbon atoms forms a temple-bell-shaped structural unit comprising closed head-top part and body-part with open lower-end, 2 to 30 of the temple-bell-shaped structural units are stacked sharing a common central axis to form an aggregate, and the aggregates are connected in head-to-tail style with a distance to form the fiber. The resin composition has high conductivity while maintaining the original physical properties of the resin. | 03-22-2012 |
Tsuyoshi Koyashiki, Yokohama JP
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20120213014 | WRITE CONTROL CIRCUIT AND SEMICONDUCTOR DEVICE - In a semiconductor device and a write control circuit, a voltage detection unit detects a write voltage supplied to a storage element (electrical fuse element) in which only single writing is electrically performed and, when the write voltage is equal to or more than a predetermined threshold voltage, allows the write control unit to stop writing to the electrical fuse element regardless of the write signal. The above processing permits the write control circuit to suppress false writing caused by the fact that abnormality occurs in a write voltage and it becomes an overvoltage. | 08-23-2012 |
Tsuyoshi Koyashiki, Tokyo JP
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20100133659 | SEMICONDUCTOR DEVICE AND METHOD OF MANUFACTURING SEMICONDUCTOR INTEGRATED CIRCUIT CHIP - A semiconductor device including a plurality of circuit regions formed in a semiconductor substrate and a scribe region formed around the circuit regions for separating the respective circuit regions, the scribe region having a plurality of laminated interlayer films including a plurality of metal films and an optically-transparent insulation film formed between and on the plurality of metal films, wherein a first metal film included in a first upper interlayer film of the plurality of interlayer films is positionally offset in a vertical direction to a second metal film included in a second lower interlayer film under the first interlayer film. | 06-03-2010 |
Yoshiaki Koyashiki, Fukuoka JP
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20110098420 | CURABLE POLYSILOXANE COMPOSITION, AND POLYSILOXANE CURED PRODUCT, OPTICAL MEMBER, MEMBER FOR AEROSPACE INDUSTRY, SEMICONDUCTOR LIGHT-EMITTING DEVICE, ILLUMINATING DEVICE AND IMAGE DISPLAY DEVICE USING THE SAME - The present invention provides a curable polysiloxane composition which is excellent in light resistance (particularly ultraviolet resistance) and adhesion and has a sufficient heat resistance/hydrothermal resistance and film-forming property and which generates little foaming at curing and does not generate cracks, peeling, coloring, and foaming even when used for a long period of time. A curable polysiloxane composition which comprises a specific hydrosilyl group-containing polysiloxane compound, a specific polysiloxane compound comprising two or more silanol groups in one molecule, and a dehydrogenative condensation reaction catalyst. | 04-28-2011 |