Ōbu, Japan
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Tominaga T.,Aisan Industry Co. | Suzuki T.,Aisan Industry Co. | Takeuchi H.,Aisan Industry Co. | Fujii H.,Nippon Steel & Sumitomo Metal Corporation
SAE Technical Papers | Year: 2013

Recently, it has been expected that titanium alloy valves will be adopted at extremely high rate to motorcycle engines where higher engine performance is required than in automobiles. However, there were difficulties with respect to reliability required for motorcycle engines. The reason for this is that engine valves of motorcycle engines are not only smaller in stem diameter, but also used at a higher maximum engine speed than those of automobile engines. This study is about a development of titanium alloy engine valves that meet reliability requirements in motorcycle engines. Copyright © 2003 SAE International and Copyright © 2003 Society of Automotive Engineers of Japan, Inc.


Patent
Aoki Science Institute Co., Aisan Industry Co., Kotobuki Kinzoku Kogyo Co. and Ryobi Ltd. | Date: 2012-02-12

An oil type release agent is provided, containing 70 to 98 parts by weight of solvents having dynamic viscosity of 2 to 10 mm^(2)/s at 40 C. and a flash point in the range of 70 to 170 C., 1 to 10 parts by weight of high viscosity mineral oils and/or synthetic oils having dynamic viscosity of 100 mm^(2)/s or higher at 40 C., 15 parts by weight or less of a silicone oil having dynamic viscosity of 150 mm^(2)/s or higher at 40 C., and 1 to 5 parts by weight of additives having a lubricating function. The flash point of the agent is in the range of 70 to 170 C., and the dynamic viscosity of the agent is 2 to 30 mm^(2)/s or higher at 40 C.


Murakami Y.,Japan National Institute of Advanced Industrial Science and Technology | Miwa K.,Aichi Science and Technology Foundation | Kito M.,Aisan Industry Co. | Honda T.,Aisan Industry Co. | And 2 more authors.
Materials Transactions | Year: 2013

The semi-solid process is viewed as a promising manufacturing method for producing nearly net-shaped metal products with low porosity and shrinkage. However, the semi-solid slurry is inferior to liquid state in terms of fluidity; thus, the semi-solid process exhibits low formability. Therefore, improving the fluidity of the semi-solid slurry is an important issue. To address the issue, we attempted to improve the fluidity by applying shear stress on the slurry at the gate of the mold. In this study, the effect of shear rate on the fluidity of the semi-solid slurry of the AC4CH aluminum alloy was investigated. The shear rate at the gate was controlled by changing the thickness of the gate to 1.0, 2.2, 3.1 and 4.0 mm. The fluidity was evaluated by injecting through a narrow gate into a spiral cavity in terms of the length that has flowed into the cavity. The microstructures were observed by optical microscopy. The roundness and diameter of the solid particles in the specimens were measured by image analysis. According to the results, the fluidity increased with increasing gate velocity or increasing shear rate at identical injection velocities. However, both the mean roundness and diameter of the solid particles in the specimen decreased with increase in the shear rate obtained by decreasing the gate thickness. Therefore, the slurry composed of fine spherical solid particles could be obtained with a high shear rate. Additionally, both the mean particle roundness and diameter correlated with fluidity. These results suggested that the fluidity of the slurry improved with increase in the gate velocity and the shear rate because the viscosity of slurry decreased. As mentioned previously, the fluidity of semi-solid slurry could be improved by controlling the gate velocity and shear rate. It is expected that this method can enable the production of semi-solid forming products with complex configurations. © 2013 The Japan Institute of Light Metals.


Murakami Y.,Japan National Institute of Advanced Industrial Science and Technology | Miwa K.,Aichi Science and Technology Foundation | Kito M.,Aisan Industry Co. | Honda T.,Aisan Industry Co. | Tada S.,Japan National Institute of Advanced Industrial Science and Technology
TMS Light Metals | Year: 2016

In the semi-solid high-pressure die casting process, the slurry flows as a solid-liquid two-phase flow. In this study, the effect of the shape of solid particles on their distribution in the slurry was investigated. The solid particles were concentrated in the center of the flow direction in the case of globular-shaped solid particles and high-flow-velocity conditions. Moreover, the concentration ratio of the solid particles increased with an increasing Reynolds number. This phenomenon was explained as follows. The shape of the solid particles affected the viscosity of the slurry; the viscosity was decreased by the globular particles. The solid particles applied Saffman force, which is generated by the velocity gradient, and moved in the direction away from the solid-liquid interface. The Reynolds number increased with decreasing viscosity or increasing flow velocity; therefore, the Saffman force increased with an increasing Reynolds number.


Patent
Toyota Jidosha Kabushiki Kaisha, Aisan Industry Co. and Nippon Soken Inc. | Date: 2010-09-13

A fuel feed system which causes liquid fuel to evaporate so as to feed gaseous fuel, provided with an evaporator which includes a heater which heats the liquid fuel to vaporize it and an electric heater which adjusts the temperature of the heater. The heater has a heat conduction surface which supplies heat to the liquid fuel. A difference between the temperature of the heat conduction surface of the heater and the boiling point of the fuel at the evaporator is used as the basis to change the temperature of the heater and adjust the heat flux at the heat conduction surface.


Patent
Hyundam Industrial Co., Korea Institute of Industrial Technology and Aisan Industry Co. | Date: 2010-03-03

A random pitch impeller for a fuel pump has number of blades. An incremental angle of the blades is set by the expression: where I is the incremental angle between the blades, N is the total number of blades (N=2, 3, 5, 7, 11, 13, 17,...), Am is the distribution magnitude of the inter-blade interval (equally divided angle) (0 < Am < 360/N), i is the order of the blade (i=1, 2, 3, ... , N), and P_(1) and P_(2) are the factors exerting an influence on the cycle (0 < P_(1) < N, and 0 P_(2) N). The incremental angle has maximum and minimum values a difference of which satisfies the expression: 2 MAX - MIN 6, where MAX is the maximum value, and MIN is the minimum value of the incremental angle.


Patent
Aisan Industry Co. and Toyota Jidosha Kabushiki Kaisha | Date: 2010-01-13

Inside an engine compartment of a vehicle, an ammonia concentration sensor is arranged above a liquid ammonia injector which is attached to an internal combustion engine body and to the rear in a direction of progression of the vehicle. An ammonia concentration which is detected by the ammonia concentration sensor is used as the basis to judge if ammonia is leaked.


Patent
Toyota Jidosha Kabushiki Kaisha and Aisan Industry Co. | Date: 2013-06-05

A fuel feed system which causes liquid fuel to evaporate so as to feed gaseous fuel, provided with an evaporator which includes a heater which heats the liquid fuel to vaporize it and an electric heater which adjusts the temperature of the heater. The heater has a heat conduction surface which supplies heat to the liquid fuel. A difference between the temperature of the heat conduction surface of the heater and the boiling point of the fuel at the evaporator is used as the basis to change the temperature of the heater and adjust the heat flux at the heat conduction surface.


Patent
Toyota Jidosha Kabushiki Kaisha and Aisan Industry Co. | Date: 2011-10-19

Inside an engine compartment (53) of a vehicle, an ammonia concentration sensor (50) is arranged above a liquid ammonia injector (13) which is attached to an internal combustion engine body (1) and to the rear in a direction of progression of the vehicle. An ammonia concentration which is detected by the ammonia concentration sensor (50) is used as the basis to judge if ammonia is leaked.


Tanaka A.,Denso Corporation | Shimada H.,Denso Corporation | Hiraiwa N.,Denso Corporation | Arai T.,Denso Corporation | And 2 more authors.
SAE International Journal of Fuels and Lubricants | Year: 2012

The need to improve fuel consumption by saving the weights of automobile parts is growing from the viewpoint of global warming mitigation. In the case of a throttle body for controlling the air flow volume into an engine, it is important to achieve a high dimensional accuracy of the valve-bore gap in the state of closed valve. In fact, most throttle bodies are made of precision-machined metal. Therefore, resin throttle bodies are drawing attention as a lightweight alternate. However, in comparison with metal throttle bodies, resin throttle bodies have two potential disadvantages that should be solved prior to productization. The first one is greater air leakage in the state of closed valve, and the second one is smaller heat conduction for unfreezing the valve in a frigid climate. We have developed an electronic resin throttle body that has overcome the above-mentioned disadvantages. The first disadvantage of greater leakage has been solved by the use of a world's first molding technology that allows simultaneous molding of the valve and bore with the same resin material in the same set of molding die under the same molding condition for improving the dimensional accuracy of valve-bore gap. In addition to that, the valve shape has been designed so as to increase the air-flow resistance at the valve-bore gap. The second disadvantage of smaller heat conduction has been compensated by the use of a double-bore structure for trapping the water droplets entrained in the air flow to the valve. This paper introduces the technological features of our electronic resin throttle body. Copyright 2011 Society of Automotive Engineers of Japan, Inc. and SAE International.

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