Patents by Inventor Naoto Shima
Naoto Shima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240087807Abstract: A powder magnetic core according to an aspect of the present disclosure is a powder magnetic core in which a magnetic powder is bonded via a binder layer. The powder magnetic core contains 88 volume % or more of magnetic powder, and when a cross-sectional photograph of the powder magnetic core is taken, an area of the cross-sectional photograph having a size of 10000 ?m2 is divided into unit areas, one or more of the unit areas in which the size of a cross-sectional area of a binder accounts for 50% or more of the unit area are extracted as specific unit areas, and the percentage of the number of specific unit areas with respect to the total number of unit areas is equal to or larger than 0.2% but equal to or smaller than 3.0%.Type: ApplicationFiled: August 23, 2023Publication date: March 14, 2024Inventors: Shun MIKOSHIBA, Hiroshi SHIMA, Kenichiro KOBAYASHI, Akiri URATA, Makoto YAMAKI, Naoto ONISHI
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Publication number: 20240087781Abstract: A powder magnetic core capable of achieving a low loss in a high frequency range is provided. A powder magnetic core according to the present disclosure is a powder magnetic core in which a magnetic powder is bonded via a binder layer. A volume filling percentage of the magnetic powder included in the powder magnetic core is 85 volume % or higher, and a value obtained by dividing a BET specific surface area (m2/g) of the powder magnetic core by a specific surface area (m2/g) calculated using outer dimensions of the powder magnetic core is 5000 or less.Type: ApplicationFiled: July 27, 2023Publication date: March 14, 2024Inventors: Makoto YAMAKI, Naoto ONISHI, Akiri URATA, Kenichiro KOBAYASHI, Yu KANAMORI, Hiroshi SHIMA, Shun MIKOSHIBA
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Patent number: 7159394Abstract: A steering speed-computing section (81) to differentiate a steering angle of a steering wheel from a steering angle sensor (18) to compute the steering speed signal, a low-pass filter (82) to cut high frequency components in the steering speed signal to output a correction steering speed signal, a switching section (87) to switch the cut-off frequency in the low-pass filter to be higher at the time of determining a high-speed steering condition, and a flow quantity-computing section (85) to compute a target flow quantity supplied to a power steering output section (8) based on the steering angle signal and the correction steering speed signal are provided to control a flow quantity of an operating oil supplied to the power steering output section (8) for the target flow quantity.Type: GrantFiled: June 22, 2005Date of Patent: January 9, 2007Assignee: Kayaba Industry Co., Ltd.Inventors: Hisashi Tsuda, Hideyasu Ihira, Tsunefumi Arita, Naoto Shima, Noboru Shimizu
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Publication number: 20060000209Abstract: A steering speed-computing section (81) to differentiate a steering angle of a steering wheel from a steering angle sensor (18) to compute the steering speed signal, a low-pass filter (82) to cut high frequency components in the steering speed signal to output a correction steering speed signal, a switching section (87) to switch the cut-off frequency in the low-pass filter to be higher at the time of determining a high-speed steering condition, and a flow quantity-computing section (85) to compute a target flow quantity supplied to a power steering output section (8) based on the steering angle signal and the correction steering speed signal are provided to control a flow quantity of an operating oil supplied to the power steering output section (8) for the target flow quantity.Type: ApplicationFiled: June 22, 2005Publication date: January 5, 2006Inventors: Hisashi Tsuda, Hideyasu Ihira, Tsunefumi Arita, Naoto Shima, Noboru Shimizu
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Patent number: 6856870Abstract: A power steering system capable of giving a driver no discomfort even when an incoming current instruction value sharply decreases. The power steering system comprises a controller C for determining a solenoid current instruction value SI on the basis of a current instruction value I1 in accordance with a steering angle supplied from a steering angle sensor, a current instruction value I2 in accordance with a steering angular velocity, and a current instruction value in accordance with a vehicle speed. The controller C comprises a delay control section for reducing the rate of decrease only when the incoming current instruction value sharply decreases and outputting the resulting current instruction value.Type: GrantFiled: January 24, 2003Date of Patent: February 15, 2005Assignee: Kayaba Industry Co., Ltd.Inventors: Noboru Shimizu, Tsunefumi Arita, Naoto Shima, Masashi Takai
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Patent number: 6845310Abstract: A power steering system capable of preventing an unnecessary standby flow produced in high speed travel. A controller C determines a basic current instruction value Id based on a current instruction value I1 in accordance with a steering angle detected by a steering angle sensor 14, a current instruction value I2 in accordance with a steering angular velocity and current instruction values I5, I6 in accordance with a vehicle speed, and adds a standby current instruction value Is to the basic current instruction value Id, and outputs the resultant value of the addition as a solenoid current instruction value SI, and changes the standby current instruction value Is on the basis of the vehicle speed.Type: GrantFiled: January 24, 2003Date of Patent: January 18, 2005Assignee: Kayaba Industry Co., Ltd.Inventors: Noboru Shimizu, Tsunefumi Arita, Naoto Shima, Masashi Takai
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Patent number: 6843342Abstract: Provision of a power steering system capable of giving a driver no discomfort during high-speed travel. A controller calculates or stores a current instruction value I1 in accordance with a steering angle supplied from a steering angle sensor and a current instruction value I2 in accordance with a steering angular velocity; performs multiplication of the steering angle base current instruction value I1 and the steering angular velocity base current instruction value I2 by current instruction values I5, I6 set based on a vehicle speed, respectively; applies current instruction values I7, I8 in accordance with the vehicle speed serving as limit values to the corresponding steering angle base and steering angular velocity base current instruction values resulting from the multiplication; selects a larger value of the two current instruction values below the limit values; and determines the selected value as a solenoid current instruction value SI.Type: GrantFiled: January 23, 2003Date of Patent: January 18, 2005Assignee: Kayaba Industry Co., Ltd.Inventors: Noboru Shimizu, Tsunofumi Arita, Naoto Shima, Masashi Takai
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Patent number: 6681884Abstract: Provision of a power steering system which is capable of preventing a delay in response for outputting a solenoid current instruction value SI. A controller C stores a table of basic current instruction values I1 corresponding to combinations of steering angles and steering angular velocities. The controller C obtains a basic current instruction value I1 from the table, and multiplies the obtained basic current instruction value I1 by a current instruction value I2 determined on the basis of a vehicle speed, and then determines the multiplied value as a solenoid current instruction value SI.Type: GrantFiled: January 23, 2003Date of Patent: January 27, 2004Assignee: Kayaba Industry Co., Ltd.Inventors: Noboru Shimizu, Tsunefumi Arita, Naoto Shima, Masashi Takai
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Patent number: 6675928Abstract: For an energy-saving type control, a value of a control low rate QP controlled by a flow control valve V is closer to a value of a flow rate required by an output side such as a power cylinder 8, a steering valve 9 or the like, to suppress a driving torque of a pump P. An excitation current I of a solenoid SOL is specified on the basis of a solenoid current instruction value IT based on a steering torque and a solenoid current instruction value IS defining a standby flow rate.Type: GrantFiled: October 4, 2002Date of Patent: January 13, 2004Assignee: Kayaba Industry Company, Ltd.Inventors: Masashi Takai, Naoto Shima, Fumihide Kozuma, Norimasa Amano, Noboru Shimizu
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Publication number: 20030144781Abstract: A power steering system capable of giving a driver no discomfort even when an incoming current instruction value sharply decreases. The power steering system comprises a controller C for determining a solenoid current instruction value SI on the basis of a current instruction value I1 in accordance with a steering angle supplied from a steering angle sensor, a current instruction value I2 in accordance with a steering angular velocity, and a current instruction value in accordance with a vehicle speed. The controller C comprises a delay control section for reducing the rate of decrease only when the incoming current instruction value sharply decreases and outputting the resulting current instruction value.Type: ApplicationFiled: January 24, 2003Publication date: July 31, 2003Applicant: Kayaba Industry Co., Ltd.Inventors: Noboru Shimizu, Tsunefumi Arita, Naoto Shima, Masashi Takai
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Publication number: 20030141138Abstract: Provision of a power steering system which is capable of preventing a delay in response for outputting a solenoid current instruction value SI. A controller C stores a table of basic current instruction values I1 corresponding to combinations of steering angles and steering angular velocities. The controller C obtains a basic current instruction value I1 from the table, and multiplies the obtained basic current instruction value I1 by a current instruction value I2 determined on the basis of a vehicle speed, and then determines the multiplied value as a solenoid current instruction value SI.Type: ApplicationFiled: January 23, 2003Publication date: July 31, 2003Applicant: Kayaba Industry Co., Ltd.Inventors: Noboru Shimizu, Tsunefumi Arita, Naoto Shima, Masashi Takai
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Publication number: 20030144782Abstract: A power steering system capable of preventing an unnecessary standby flow produced in high speed travel. A controller C determines a basic current instruction value Id based on a current instruction value I1 in accordance with a steering angle detected by a steering angle sensor 14, a current instruction value I2 in accordance with a steering angular velocity and current instruction values I5, I6 in accordance with a vehicle speed, and adds a standby current instruction value Is to the basic current instruction value Id, and outputs the resultant value of the addition as a solenoid current instruction value SI, and changes the standby current instruction value Is on the basis of the vehicle speed.Type: ApplicationFiled: January 24, 2003Publication date: July 31, 2003Applicant: Kayaba Industry Co., Ltd.Inventors: Noboru Shimizu, Tsunefumi Arita, Naoto Shima, Masashi Takai
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Publication number: 20030141139Abstract: Provision of a power steering system capable of giving a driver no discomfort during high-speed travel. A controller calculates or stores a current instruction value I1 in accordance with a steering angle supplied from a steering angle sensor and a current instruction value I2 in accordance with a steering angular velocity; performs multiplication of the steering angle base current instruction value I1 and the steering angular velocity base current instruction value I2 by current instruction values I5, I6 set based on a vehicle speed, respectively; applies current instruction values I7, I8 in accordance with the vehicle speed serving as limit values to the corresponding steering angle base and steering angular velocity base current instruction values resulting from the multiplication; selects a larger value of the two current instruction values below the limit values; and determines the selected value as a solenoid current instruction value SI.Type: ApplicationFiled: January 23, 2003Publication date: July 31, 2003Applicant: Kayaba Industry Co., Ltd.Inventors: Noboru Shimizu, Tsunefumi Arita, Naoto Shima, Masashi Takai
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Publication number: 20030029667Abstract: For an energy-saving type control, a value of a control low rate QP controlled by a flow control valve V is closer to a value of a flow rate required by an output side such as a power cylinder 8, a steering valve 9 or the like, to suppress a driving torque of a pump P. An excitation current I of a solenoid SOL is specified on the basis of a solenoid current instruction value IT based on a steering torque and a solenoid current instruction value IS defining a standby flow rate.Type: ApplicationFiled: October 4, 2002Publication date: February 13, 2003Applicant: KAYABA INDUSTRY CO., LTD.Inventors: Masashi Takai, Naoto Shima, Fumihide Kozuma, Norimasa Amano, Noboru Shimizu
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Patent number: 6499557Abstract: For an energy-saving type control, a value of a control low rate QP controlled by a flow control valve V is closer to a value of a flow rate required by an output side such as a power cylinder 8, a steering valve 9 or the like, to suppress a driving torque of a pump P. An excitation current I of a solenoid SOL is specified on the basis of a solenoid current instruction value IT based on a steering torque and a solenoid current instruction value IS defining a standby flow rate.Type: GrantFiled: February 21, 2002Date of Patent: December 31, 2002Assignee: Kayaba Industry Co., Ltd.Inventors: Masashi Takai, Naoto Shima, Fumihide Kozuma, Norimasa Amano, Noboru Shimizu
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Patent number: 6484841Abstract: For an energy-saving type control, a value of a control low rate QP controlled by a flow control valve V is closer to a value of a flow rate required by an output side such as a power cylinder 8, a steering valve 9 or the like, to suppress a driving torque of a pump P. An excitation current I of a solenoid SOL is specified on the basis of a solenoid current instruction value IT based on a steering torque and a solenoid current instruction value IS defining a standby flow rate.Type: GrantFiled: December 12, 2000Date of Patent: November 26, 2002Assignee: Kayaba Industry Co., Ltd.Inventors: Masashi Takai, Naoto Shima, Fumihide Kozuma, Norimasa Amano, Noboru Shimizu
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Publication number: 20020074183Abstract: For an energy-saving type control, a value of a control low rate QP controlled by a flow control valve V is closer to a value of a flow rate required by an output side such as a power cylinder 8, a steering valve 9 or the like, to suppress a driving torque of a pump P. An excitation current I of a solenoid SOL is specified on the basis of a solenoid current instruction value IT based on a steering torque and a solenoid current instruction value IS defining a standby flow rate.Type: ApplicationFiled: February 21, 2002Publication date: June 20, 2002Applicant: KAYABA INDUSTRY CO., LTD.Inventors: Masashi Takai, Naoto Shima, Fumihide Kozuma, Norimasa Amano, Noboru Shimizu
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Publication number: 20010004953Abstract: For an energy-saving type control, a value of a control low rate QP controlled by a flow control valve V is closer to a value of a flow rate required by an output side such as a power cylinder 8, a steering valve 9 or the like, to suppress a driving torque of a pump P. An excitation current I of a solenoid SOL is specified on the basis of a solenoid current instruction value IT based on a steering torque and a solenoid current instruction value IS defining a standby flow rate.Type: ApplicationFiled: December 12, 2000Publication date: June 28, 2001Applicant: Kayaba Industry Co., Ltd.Inventors: Masashi Takai, Naoto Shima, Fumihide Kozuma, Norimasa Amano, Noboru Shimizu