Patents by Inventor Yuuki Naitou
Yuuki Naitou 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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Patent number: 11434953Abstract: An electric actuator 1 includes: an electric motor 10; a first motion conversion mechanism 20 that has a screw shaft 21 rotatably driven by the electric motor 10 and a nut 22 screwed with the screw shaft 21, and converts a rotary motion of the screw shaft 21 into a linear motion of the nut 22; and a housing 40 accommodating the electric motor 10 and the motion conversion mechanism 20. The housing 40 includes a pair of housing split bodies 41 and 42 split by a plane parallel to an axial direction of the screw shaft 21.Type: GrantFiled: November 22, 2018Date of Patent: September 6, 2022Assignee: NTN CORPORATIONInventors: Akio Kato, Yuuki Naitou, Youhei Yamashita
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Patent number: 11177718Abstract: An electric actuator (1) includes: a motor part (A); a motion conversion mechanism part (B); and a housing (2) configured to house the motor part (A) and the motion conversion mechanism part (B). The motion conversion mechanism part (B) includes: a screw shaft (33); and a nut member (32) rotatably fitted to an outer periphery of the screw shaft. The screw shaft (33) performs a linear motion in an axial direction along with a rotation of the nut member (32). The housing (2) includes a plurality of members coupled to one another in the axial direction. A terminal part (D) (terminal main body (50)) configured to hold a power supply circuit configured to supply drive power to the motor part (A) includes a tubular portion (50A) sandwiched by the members forming the housing (2) from both sides in the axial direction.Type: GrantFiled: March 10, 2017Date of Patent: November 16, 2021Assignee: NTN CORPORATIONInventors: Takushi Matsuto, Yoshinori Ikeda, Yuuki Naitou
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Patent number: 11101716Abstract: Provided is an electric actuator (1), including: a motor part (A); and a motion conversion mechanism part (B). The motion conversion mechanism part (B) includes: a ball screw shaft (33); and a ball screw nut (32), which is rotatably fitted to an outer periphery of the ball screw shaft (33), and is provided so as to be capable of transmitting torque with a rotor (24) of the motor part (A) rotatably supported through intermediation of a rolling bearing (27, 30). The ball screw shaft (33) advances toward one side in the axial direction or retreats toward another side in the axial direction in accordance with a rotation direction of the ball screw nut (32). In the electric actuator (1), a needle roller bearing (47) serving as a thrust bearing is arranged adjacent to the ball screw nut (32) on the another side in the axial direction.Type: GrantFiled: January 26, 2017Date of Patent: August 24, 2021Assignee: NTN CORPORATIONInventors: Takushi Matsuto, Yoshinori Ikeda, Yuuki Naitou
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Publication number: 20210234421Abstract: A rotor unit 1 used in an electric motor, the rotor unit 1 including a rotor core 5, a rotary shaft 3 inserted in an inner periphery of the rotor core 5, a plurality of magnets 6 attached to an outer peripheral surface of the rotor core 5, and a cover member 4 covering an outer periphery of each of the plurality of the magnets 6, in which the rotary shaft 3 is provided, on an outer peripheral surface of the rotary shaft 3, with a caulking part 3c configured to restrict an axial movement of the rotor core 5 with respect to the rotary shaft 3, and the caulking part 3c is configured to restrict an axial movement of the cover member 4 with respect to the rotor core 5.Type: ApplicationFiled: June 4, 2019Publication date: July 29, 2021Inventor: Yuuki NAITOU
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Patent number: 11035454Abstract: Provided is a rotational-force transmitting part including: a rotation support member that is supported, with respect to a first member, so as to be rotatable about a predetermined axis by means of a bearing and that is provided with a first fitting surface formed of a cylindrical outer surface or a cylindrical inner surface centered on the axis; a rotational-force transmitting member that transmits a rotational force with respect to a second member and that is provided with a second fitting surface to be fitted onto the first fitting surface; an annular elastic member that is disposed at such a position as to seal a space between the first fitting surface and the second fitting surface; and a fixing member that fixes the rotational-force transmitting member and the rotation support member in a state in which the first fitting surface and the second fitting surface are fitted.Type: GrantFiled: August 22, 2019Date of Patent: June 15, 2021Assignee: FANUC CORPORATIONInventors: Yuuki Naitou, Genki Miyazaki
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Publication number: 20200400188Abstract: An electric actuator 1 includes: an electric motor 10; a first motion conversion mechanism 20 that has a screw shaft 21 rotatably driven by the electric motor 10 and a nut 22 screwed with the screw shaft 21, and converts a rotary motion of the screw shaft 21 into a linear motion of the nut 22; and a housing 40 accommodating the electric motor 10 and the motion conversion mechanism 20. The housing 40 includes a pair of housing split bodies 41 and 42 split by a plane parallel to an axial direction of the screw shaft 21.Type: ApplicationFiled: November 22, 2018Publication date: December 24, 2020Inventors: Akio KATO, Yuuki NAITOU, Youhei YAMASHITA
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Patent number: 10865861Abstract: Provided is a ball screw device (31), including: a ball screw shaft (33); and a ball screw nut (32) which is rotatably fitted to an outer periphery of the ball screw shaft (33) through intermediation of a plurality of balls (34), wherein the ball screw shaft (33) performs a linear motion in an axial direction along with rotation of the ball screw nut (32), wherein the ball screw shaft (33) has a hollow shape having a hole portion (33b) extending in the axial direction, and wherein a stroke detection sensor (55) configured to detect an amount of displacement of the ball screw shaft (33) in the axial direction is arranged in the hole portion (33b).Type: GrantFiled: January 25, 2017Date of Patent: December 15, 2020Assignee: NTN CORPORATIONInventors: Takushi Matsuto, Yoshinori Ikeda, Yuuki Naitou
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Patent number: 10830320Abstract: Provided is an electric actuator, including: a motor part; a motion conversion mechanism part; an operation part; and a terminal part, wherein a hollow rotary shaft configured to support a rotor core of the motor part is supported by a rolling bearing so as to be rotatable, wherein the motion conversion mechanism part is coupled to the hollow rotary shaft, and includes a ball screw, wherein a ball screw nut of the ball screw is arranged inside the hollow rotary shaft, wherein the operation part is coupled to the motion conversion mechanism part, and wherein an inner raceway surface of the rolling bearing is formed on the hollow rotary shaft.Type: GrantFiled: December 27, 2016Date of Patent: November 10, 2020Assignee: NTN CORPORATIONInventors: Takushi Matsuto, Yoshinori Ikeda, Yuuki Naitou
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Publication number: 20200313508Abstract: An electric actuator (1) includes: a motor part (A); a motion conversion mechanism part (B); and a housing (2) configured to house the motor part (A) and the motion conversion mechanism part (B). The motion conversion mechanism part (B) includes: a screw shaft (33); and a nut member (32) rotatably fitted to an outer periphery of the screw shaft. The screw shaft (33) performs a linear motion in an axial direction along with a rotation of the nut member (32). The housing (2) includes a plurality of members coupled to one another in the axial direction. A terminal part (D) (terminal main body (50)) configured to hold a power supply circuit configured to supply drive power to the motor part (A) includes a tubular portion (50A) sandwiched by the members forming the housing (2) from both sides in the axial direction.Type: ApplicationFiled: March 10, 2017Publication date: October 1, 2020Inventors: Takushi MATSUTO, Yoshinori IKEDA, Yuuki NAITOU
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Patent number: 10731739Abstract: Provided is an electric actuator (1), including: a motor part (A); and a motion conversion mechanism part (B) configured to convert a rotary motion of the motor part (A) into a linear motion to output the linear motion. The motion conversion mechanism part (B) includes: a screw shaft (33) arranged coaxially with a rotation center of a rotor (24) of the motor part (A); and a nut member (32) rotatably fitted to an outer periphery of the screw shaft. The rotor (24) includes a rotor inner (26) serving as a hollow rotary shaft having the nut member (32) arranged on an inner periphery thereof. A rotary motion of the rotor (24) is transmitted to the nut member (32) through an intermediate member (Z) arranged between an inner peripheral surface of the rotor inner (26) and an outer peripheral surface (32b) of the nut member (32).Type: GrantFiled: March 16, 2017Date of Patent: August 4, 2020Assignee: NTN CORPORATIONInventors: Takushi Matsuto, Yoshinori Ikeda, Yuuki Naitou
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Publication number: 20200109772Abstract: Provided is a rotational-force transmitting part including: a rotation support member that is supported, with respect to a first member, so as to be rotatable about a predetermined axis by means of a bearing and that is provided with a first fitting surface formed of a cylindrical outer surface or a cylindrical inner surface centered on the axis; a rotational-force transmitting member that transmits a rotational force with respect to a second member and that is provided with a second fitting surface to be fitted onto the first fitting surface; an annular elastic member that is disposed at such a position as to seal a space between the first fitting surface and the second fitting surface; and a fixing member that fixes the rotational-force transmitting member and the rotation support member in a state in which the first fitting surface and the second fitting surface are fitted.Type: ApplicationFiled: August 22, 2019Publication date: April 9, 2020Applicant: Fanuc CorporationInventors: Yuuki NAITOU, Genki MIYAZAKI
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Publication number: 20190097492Abstract: Provided is an electric actuator (1), including: a motor part (A); and a motion conversion mechanism part (B). The motion conversion mechanism part (B) includes: a screw shaft (33); a nut member (32); and a planetary gear speed reducer (10) configured to reduce a speed of rotation of the rotor (24) and output the rotation. The screw shaft (33) is configured to advance toward one side in an axial direction or retreat toward another side in the axial direction in accordance with a rotation direction of the nut member (32), and the nut member (32) is arranged on an inner periphery of the rotor (24), and is coupled to a planetary gear carrier (43), which is an output member of the planetary gear speed reducer (10), so as to be capable of transmitting torque.Type: ApplicationFiled: March 6, 2017Publication date: March 28, 2019Inventors: Takushi MATSUTO, Yoshinori IKEDA, Yuuki NAITOU
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Publication number: 20190085957Abstract: An electric actuator includes a housing configured to accommodate and hold a motor part and a motion conversion mechanism part. The motion conversion mechanism part includes: a screw shaft; and a nut member. An operation part mounted to the screw shaft is configured to operate an object to be operated in an axial direction through a linear motion of the screw shaft in the axial direction along with a rotation of the nut member. A terminal part (terminal main body) configured to hold an electrical component includes a tubular portion sandwiched by members forming the housing from both sides in the axial direction, and has an opening portion formed in in the tubular portion and configured to cause an inside and an outside of the housing to communicate with each other. The screw shaft is formed into a hollow shape having a through hole extending in the axial direction.Type: ApplicationFiled: March 9, 2017Publication date: March 21, 2019Inventors: Takushi MATSUTO, Yoshinori IKEDA, Yuuki NAITOU
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Publication number: 20190072163Abstract: Provided is an electric actuator (1), including: a motor part (A); and a motion conversion mechanism part (B) configured to convert a rotary motion of the motor part (A) into a linear motion to output the linear motion. The motion conversion mechanism part (B) includes: a screw shaft (33) arranged coaxially with a rotation center of a rotor (24) of the motor part (A); and a nut member (32) rotatably fitted to an outer periphery of the screw shaft. The rotor (24) includes a rotor inner (26) serving as a hollow rotary shaft having the nut member (32) arranged on an inner periphery thereof. A rotary motion of the rotor (24) is transmitted to the nut member (32) through an intermediate member (Z) arranged between an inner peripheral surface of the rotor inner (26) and an outer peripheral surface (32b) of the nut member (32).Type: ApplicationFiled: March 16, 2017Publication date: March 7, 2019Applicant: NTN CORPORATIONInventors: Takushi MATSUTO, Yoshinori IKEDA, Yuuki NAITOU
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Publication number: 20190040940Abstract: Provided is an electric actuator, including: a motor part; a motion conversion mechanism part; an operation part; and a terminal part, wherein a hollow rotary shaft configured to support a rotor core of the motor part is supported by a rolling bearing so as to be rotatable, wherein the motion conversion mechanism part is coupled to the hollow rotary shaft, and includes a ball screw, wherein a ball screw nut of the ball screw is arranged inside the hollow rotary shaft, wherein the operation part is coupled to the motion conversion mechanism part, and wherein an inner raceway surface of the rolling bearing is formed on the hollow rotary shaft.Type: ApplicationFiled: December 27, 2016Publication date: February 7, 2019Inventors: Takushi MATSUTO, Yoshinori IKEDA, Yuuki NAITOU
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Publication number: 20190040939Abstract: Provided is a ball screw device (31), including: a ball screw shaft (33); and a ball screw nut (32) which is rotatably fitted to an outer periphery of the ball screw shaft (33) through intermediation of a plurality of balls (34), wherein the ball screw shaft (33) performs a linear motion in an axial direction along with rotation of the ball screw nut (32), wherein the ball screw shaft (33) has a hollow shape having a hole portion (33b) extending in the axial direction, and wherein a stroke detection sensor (55) configured to detect an amount of displacement of the ball screw shaft (33) in the axial direction is arranged in the hole portion (33b).Type: ApplicationFiled: January 25, 2017Publication date: February 7, 2019Inventors: Takushi MATSUTO, Yoshinori IKEDA, Yuuki NAITOU
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Publication number: 20190044409Abstract: Provided is an electric actuator (1), including: a motor part (A); and a motion conversion mechanism part (B). The motion conversion mechanism part (B) includes: a ball screw shaft (33); and a ball screw nut (32), which is rotatably fitted to an outer periphery of the ball screw shaft (33), and is provided so as to be capable of transmitting torque with a rotor (24) of the motor part (A) rotatably supported through intermediation of a rolling bearing (27, 30). The ball screw shaft (33) advances toward one side in the axial direction or retreats toward another side in the axial direction in accordance with a rotation direction of the ball screw nut (32). In the electric actuator (1), a needle roller bearing (47) serving as a thrust bearing is arranged adjacent to the ball screw nut (32) on the another side in the axial direction.Type: ApplicationFiled: January 26, 2017Publication date: February 7, 2019Inventors: Takushi MATSUTO, Yoshinori IKEDA, Yuuki NAITOU
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Patent number: D832325Type: GrantFiled: August 1, 2016Date of Patent: October 30, 2018Assignee: NTN CORPORATIONInventors: Takushi Matsuto, Yoshinori Ikeda, Yuuki Naitou