Patents by Inventor Tomohiro Yuasa

Tomohiro Yuasa 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).

  • Patent number: 10948099
    Abstract: A motor operated valve includes a feed screw mechanism and a stopper mechanism. The feed screw mechanism includes a guiding part including an external thread portion on an outer surface thereof, and a guided part that is a cylindrical member constituting a rotation shaft of a rotor, and including an internal thread portion, which is engaged with the external thread portion, on an inner surface thereof. The stopper mechanism includes a stopper portion provided on the guided part, and a stopping face formed integrally with the guiding part. When a valve element is driven by the motor to move in a valve closing direction, the stopping face stops the stopper portion to restrict the movement of the rotor in the valve closing direction.
    Type: Grant
    Filed: February 4, 2020
    Date of Patent: March 16, 2021
    Assignee: TGK CO., LTD.
    Inventors: Michio Matsumoto, Shinji Saeki, Youichi Miura, Tomohiro Yuasa
  • Publication number: 20200263800
    Abstract: A motor operated valve includes a feed screw mechanism and a stopper mechanism. The feed screw mechanism includes a guiding part including an external thread portion on an outer surface thereof, and a guided part that is a cylindrical member constituting a rotation shaft of a rotor, and including an internal thread portion, which is engaged with the external thread portion, on an inner surface thereof. The stopper mechanism includes a stopper portion provided on the guided part, and a stopping face formed integrally with the guiding part. When a valve element is driven by the motor to move in a valve closing direction, the stopping face stops the stopper portion to restrict the movement of the rotor in the valve closing direction.
    Type: Application
    Filed: February 4, 2020
    Publication date: August 20, 2020
    Inventors: Michio MATSUMOTO, Shinji SAEKI, Youichi MIURA, Tomohiro YUASA
  • Patent number: 9803770
    Abstract: A control valve includes a shaft, a stopper mechanism, and a can. A stator coil is coaxially mounted around the can. Positions in a rotating direction of the rotor and the stator when the shaft is stopped by an operation of the stopper mechanism are set to be reference positions at which magnetic poles of the stator and those of the rotor are opposite to each other. The rotor is configured to be stopped at the reference position by an arrangement of the stopper mechanism. The stator coil is positioned relative to the body according to a positional relation between a fitting part formed on surfaces of the stator and the body attached to each other and an insertion part where the can is inserted into the stator, and magnetic poles of the stator and those of the rotor are made opposite to each other at the reference positions.
    Type: Grant
    Filed: November 11, 2015
    Date of Patent: October 31, 2017
    Assignee: TGK CO., LTD.
    Inventors: Kazushi Takahashi, Tomohiro Yuasa, Yuto Ooe
  • Patent number: 9366353
    Abstract: A control valve according to an embodiment includes: a body having an inlet port, an outlet port, and a valve hole that communicates the inlet port and the outlet port together; a valve element configured to open and close a valve section; a drive mechanism configured to drive the valve element; a stepping motor having both a rotor for operating the drive mechanism and a stator for rotationally driving the rotor; and a can that is a cylindrical member covering a space where the valve element and the drive mechanism are arranged and involving the rotor and that defines a pressure space and a non-pressure space. The can is fixed to the body with a ring screw, and the stator is arranged at an outer circumference of the can and fixed to the body with a screw member.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: June 14, 2016
    Assignee: TGK CO., LTD
    Inventors: Yuto Ooe, Kazushi Takahashi, Tomohiro Yuasa
  • Publication number: 20150096630
    Abstract: An electromagnetic valve according to one embodiment includes a driven member configured such that a piston and a valve element are vertically coupled with each other and configured such that a pilot passage runs through the driven member. Here, the piston separates a high-pressure chamber from a back pressure chamber. The valve element opens and closes a main valve by moving toward and away from a valve hole. The pilot passage communicates between a low-pressure chamber and the back pressure chamber. A communicating path, through which the high-pressure chamber and the back pressure chamber communicate with each other, is formed in the piston. The communicating path is formed such that an orifice, which is open to the back pressure chamber, and a communication hole, having a larger cross section than that of the orifice, are vertically connected with each other. The orifice is located above the communication hole.
    Type: Application
    Filed: October 3, 2014
    Publication date: April 9, 2015
    Inventors: Hirofumi OGAWA, Shinji SAEKI, Toshihiro ANDOH, Shigeru ABE, Tomohiro YUASA
  • Publication number: 20140291562
    Abstract: A control valve according to an embodiment includes: a body having an inlet port, an outlet port, and a valve hole that communicates the inlet port and the outlet port together; a valve element configured to open and close a valve section; a drive mechanism configured to drive the valve element; a stepping motor having both a rotor for operating the drive mechanism and a stator for rotationally driving the rotor; and a can that is a cylindrical member covering a space where the valve element and the drive mechanism are arranged and involving the rotor and that defines a pressure space and a non-pressure space. The can is fixed to the body with a ring screw, and the stator is arranged at an outer circumference of the can and fixed to the body with a screw member.
    Type: Application
    Filed: March 26, 2014
    Publication date: October 2, 2014
    Applicant: TGK CO., LTD.
    Inventors: Yuto Ooe, Kazushi Takahashi, Tomohiro Yuasa
  • Publication number: 20080053125
    Abstract: To provide an expansion device which shortens cool down time when an automotive air conditioner is started under a high-load condition. An expansion device having a differential pressure control valve is configured such that a temperature-sensing actuator (shape-memory alloy spring) is disposed at an refrigerant outlet of the expansion device, and when an air conditioner is started under a high-load condition in which the temperature of refrigerant at the refrigerant outlet is high, the shape-memory alloy spring senses the high temperature, to urge a spring determining a valve-opening point of the differential pressure control valve, whereby the differential pressure control valve is opened in advance or placed in a state capable of opening in response to a very low differential pressure, thereby making it possible to cause refrigerant to flow at a large flow rate until the temperature of refrigerant at the refrigerant outlet is lowered to a temperature assumed when the air conditioner functions.
    Type: Application
    Filed: August 24, 2007
    Publication date: March 6, 2008
    Applicant: TGK CO., LTD.
    Inventors: Ryosuke SATAKE, Masaaki TONEGAWA, Tomohiro YUASA, Tokumi TSUGAWA
  • Publication number: 20040007015
    Abstract: The object of the present invention is to provide an expansion valve that suppresses noise generated when an air conditioner is started, and achieves saving of driving force. The stroke of a valve element is set such that refrigerant flows at a flow rate 1.0 to 1.4 times the flow rate corresponding to the set tonnage. This limits the valve lift of the valve in the fully open state during start-up such that it provides a flow rate of refrigerant only 1.0 to 1.4 times the flow rate corresponding to the set tonnage. This prevents an unnecessary and excessive amount of refrigerant from flowing, whereby it is possible to reduce flow noise of refrigerant during start-up. Further, since the excessive amount of flow of refrigerant is reduced, it is possible to achieve saving of driving force.
    Type: Application
    Filed: July 10, 2003
    Publication date: January 15, 2004
    Applicant: TGK CO., LTD.
    Inventors: Isao Sendo, Tomohiro Yuasa