Patents by Inventor Masaaki Tonegawa

Masaaki Tonegawa 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: 10883480
    Abstract: A control valve includes: a first valve to control a flow rate of refrigerant flowing from a discharge chamber to a control chamber of a compressor; a second valve to control a flow rate of the refrigerant flowing from the control chamber to a suction chamber; a solenoid to generate a drive force in a first valve closing direction and a second valve opening direction; a biasing member to generate a biasing force in an first valve opening direction and a second valve closing direction; and a pressure sensing part to sense a pressure in the suction chamber or the control chamber, and generate a counterforce against the drive force.
    Type: Grant
    Filed: January 15, 2018
    Date of Patent: January 5, 2021
    Assignee: TGK CO., LTD.
    Inventors: Kazuhiro Irie, Masaaki Tonegawa, Hiroshi Hamada
  • Patent number: 10837431
    Abstract: A control valve includes: a body having a control chamber communication port and a suction chamber communication port; a valve element that moves toward and away from a valve hole to close and opening a bleed valve, the ports communicating with each other through the valve hole; a solenoid to generate a drive force in an opening direction of the bleed valve; and a pressure sensing element to sense a pressure in the suction chamber or a pressure in the control chamber, and generate a counterforce against the drive force from the solenoid depending on a magnitude of the sensed pressure. An opening degree of the bleed valve is controlled so that the sensed pressure becomes a set pressure. A bleed passage for delivering the refrigerant introduced through the control chamber communication port to the suction chamber even while the bleed valve is in a closed state is formed.
    Type: Grant
    Filed: April 4, 2018
    Date of Patent: November 17, 2020
    Assignee: TGK CO., LTD.
    Inventors: Masaaki Tonegawa, Hiroshi Hamada
  • Patent number: 10801480
    Abstract: A control valve includes: a body having a main passage through which a discharge chamber and a control chamber communicate, and a sub-passage through which the control chamber and a suction chamber communicate; a main valve seat provided in the main passage; a main valve element configured to touch and leave the main valve seat to close and open a main valve; a sub-valve seat provided in the sub-passage; a sub-valve element configured to touch and leave the sub-valve seat to close and open a sub-valve; a solenoid configured to generate a drive force in a valve closing direction of the main valve; an actuating rod for transmitting the drive force of the solenoid to the main valve element and the sub-valve element; a spring for applying a biasing force to the main valve in a valve opening direction; a spring for applying a biasing force to the sub-valve in a valve closing direction; and a differential pressure valve opening mechanism configured to open the sub-valve when a pressure difference between a control
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: October 13, 2020
    Assignee: TGK Co., LTD.
    Inventors: Ryota Sugamura, Shinji Saeki, Masaaki Tonegawa
  • Patent number: 10760559
    Abstract: A control valve includes: a first valve to control a flow rate of refrigerant flowing from a discharge chamber to a control chamber of a compressor; a second valve to control a flow rate of the refrigerant flowing from the control chamber to a suction chamber; a solenoid to generate a drive force in a first valve closing direction and a second valve opening direction; a biasing member to generate a biasing force in an first valve opening direction and a second valve closing direction; and a pressure sensing part to sense a pressure in the suction chamber or the control chamber, and generate a counterforce against the drive force.
    Type: Grant
    Filed: June 13, 2017
    Date of Patent: September 1, 2020
    Assignee: TGK CO., LTD.
    Inventors: Kazuhiro Irie, Masaaki Tonegawa, Hiroshi Hamada
  • Patent number: 10557463
    Abstract: A control valve includes: a body having a main passage through which a discharge chamber and a control chamber communicate, and a sub-passage through which the control chamber and a suction chamber communicate; a main valve seat provided in the main passage; a main valve element configured to touch and leave the main valve seat to close and open a main valve; a sub-valve seat provided in the sub-passage; a sub-valve element configured to touch and leave the sub-valve seat to close and open a sub-valve; a solenoid configured to generate a drive force in a valve closing direction of the main valve; an actuating rod for transmitting the drive force of the solenoid to the main valve element and the sub-valve element; a spring for applying a biasing force to the main valve in a valve opening direction; a spring for applying a biasing force to the sub-valve in a valve closing direction; and a differential pressure valve opening mechanism configured to open the sub-valve when a pressure difference between a control
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: February 11, 2020
    Assignee: TGK CO., LTD.
    Inventors: Ryota Sugamura, Shinji Saeki, Masaaki Tonegawa
  • Publication number: 20190040853
    Abstract: A control valve includes: a body having a main passage through which a discharge chamber and a control chamber communicate, and a sub-passage through which the control chamber and a suction chamber communicate; a main valve seat provided in the main passage; a main valve element configured to touch and leave the main valve seat to close and open a main valve; a sub-valve seat provided in the sub-passage; a sub-valve element configured to touch and leave the sub-valve seat to close and open a sub-valve; a solenoid configured to generate a drive force in a valve closing direction of the main valve; an actuating rod for transmitting the drive force of the solenoid to the main valve element and the sub-valve element; a spring for applying a biasing force to the main valve in a valve opening direction; a spring for applying a biasing force to the sub-valve in a valve closing direction; and a differential pressure valve opening mechanism configured to open the sub-valve when a pressure difference between a control
    Type: Application
    Filed: October 5, 2018
    Publication date: February 7, 2019
    Inventors: Ryota Sugamura, Shinji Saeki, Masaaki Tonegawa
  • Publication number: 20190040852
    Abstract: A control valve includes: a body having a main passage through which a discharge chamber and a control chamber communicate, and a sub-passage through which the control chamber and a suction chamber communicate; a main valve seat provided in the main passage; a main valve element configured to touch and leave the main valve seat to close and open a main valve; a sub-valve seat provided in the sub-passage; a sub-valve element configured to touch and leave the sub-valve seat to close and open a sub-valve; a solenoid configured to generate a drive force in a valve closing direction of the main valve; an actuating rod for transmitting the drive force of the solenoid to the main valve element and the sub-valve element; a spring for applying a biasing force to the main valve in a valve opening direction; a spring for applying a biasing force to the sub-valve in a valve closing direction; and a differential pressure valve opening mechanism configured to open the sub-valve when a pressure difference between a control
    Type: Application
    Filed: October 5, 2018
    Publication date: February 7, 2019
    Inventors: Ryota Sugamura, Shinji Saeki, Masaaki Tonegawa
  • Patent number: 10113539
    Abstract: A control valve includes: a body having a main passage through which a discharge chamber and a control chamber communicate, and a sub-passage through which the control chamber and a suction chamber communicate; a main valve seat provided in the main passage; a main valve element configured to touch and leave the main valve seat to close and open a main valve; a sub-valve seat provided in the sub-passage; a sub-valve element configured to touch and leave the sub-valve seat to close and open a sub-valve; a solenoid configured to generate a drive force in a valve closing direction of the main valve; an actuating rod for transmitting the drive force of the solenoid to the main valve element and the sub-valve element; a spring for applying a biasing force to the main valve in a valve opening direction; a spring for applying a biasing force to the sub-valve in a valve closing direction; and a differential pressure valve opening mechanism configured to open the sub-valve when a pressure difference between a control
    Type: Grant
    Filed: March 23, 2016
    Date of Patent: October 30, 2018
    Assignee: TGK CO., LTD.
    Inventors: Ryota Sugamura, Shinji Saeki, Masaaki Tonegawa
  • Publication number: 20180291888
    Abstract: A control valve includes: a body having a control chamber communication port and a suction chamber communication port; a valve element that moves toward and away from a valve hole to close and opening a bleed valve, the ports communicating with each other through the valve hole; a solenoid to generate a drive force in an opening direction of the bleed valve; and a pressure sensing element to sense a pressure in the suction chamber or a pressure in the control chamber, and generate a counterforce against the drive force from the solenoid depending on a magnitude of the sensed pressure. An opening degree of the bleed valve is controlled so that the sensed pressure becomes a set pressure. A bleed passage for delivering the refrigerant introduced through the control chamber communication port to the suction chamber even while the bleed valve is in a closed state is formed.
    Type: Application
    Filed: April 4, 2018
    Publication date: October 11, 2018
    Inventors: Masaaki TONEGAWA, Hiroshi HAMADA
  • Publication number: 20180135610
    Abstract: A control valve includes: a first valve to control a flow rate of refrigerant flowing from a discharge chamber to a control chamber of a compressor; a second valve to control a flow rate of the refrigerant flowing from the control chamber to a suction chamber; a solenoid to generate a drive force in a first valve closing direction and a second valve opening direction; a biasing member to generate a biasing force in an first valve opening direction and a second valve closing direction; and a pressure sensing part to sense a pressure in the suction chamber or the control chamber, and generate a counterforce against the drive force.
    Type: Application
    Filed: January 15, 2018
    Publication date: May 17, 2018
    Inventors: Kazuhiro IRIE, Masaaki TONEGAWA, Hiroshi HAMADA
  • Patent number: 9903362
    Abstract: In a control valve, the spring load of a spring, which biases a main valve element in a valve opening direction, is regulated, for instance. This allows a range of suction pressures Ps, where a main valve and a sub-valve are simultaneously closed until a sub-valve element is lifted from a sub-valve seat after a main valve element has been seated on a main valve seat, to be set as a deadband. The control valve is configured such that the value of a suction pressure Ps with which to open the sub-valve after the closing of the main valve and the pressure values at which the deadband takes place are set variably by the setting of a value of current supplied to the solenoid.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: February 27, 2018
    Assignee: TGK CO., LTD.
    Inventors: Shinji Saeki, Masaaki Tonegawa
  • Patent number: 9863411
    Abstract: A control valve is configured such that a suction pressure, which is used to displace a sub-valve element in a valve opening direction after a main valve has been closed, is varied according to a value of current supplied to a solenoid. A crankcase communication port, which communicates with a crankcase of a compressor, and a suction chamber communication port, which communicates with a suction chamber of the compressor, are provided in a body. A sub-valve chamber whose diameter is larger than that of the main valve hole is formed between the crankcase communication port and a main valve hole, and a sub-valve is placed in the sub-valve chamber.
    Type: Grant
    Filed: June 18, 2014
    Date of Patent: January 9, 2018
    Assignee: TGK CO., LTD.
    Inventors: Shinji Saeki, Masaaki Tonegawa
  • Publication number: 20170356430
    Abstract: A control valve includes: a first valve to control a flow rate of refrigerant flowing from a discharge chamber to a control chamber of a compressor; a second valve to control a flow rate of the refrigerant flowing from the control chamber to a suction chamber; a solenoid to generate a drive force in a first valve closing direction and a second valve opening direction; a biasing member to generate a biasing force in an first valve opening direction and a second valve closing direction; and a pressure sensing part to sense a pressure in the suction chamber or the control chamber, and generate a counterforce against the drive force.
    Type: Application
    Filed: June 13, 2017
    Publication date: December 14, 2017
    Inventors: Kazuhiro IRIE, Masaaki TONEGAWA, Hiroshi HAMADA
  • Patent number: 9732874
    Abstract: A control valve according to an exemplary embodiment includes an interlocking mechanism that achieves a first operation and a second operation simultaneously or continuously. In the first operation, a sub-valve is opened by having an actuating rod displaced integrally with a sub-valve element in accordance with the magnitude of solenoidal force. In the second operation, a load, by which to bias a main valve element in a closing direction of a main valve, is increased by displacing the actuating rod relative to the main valve element.
    Type: Grant
    Filed: November 14, 2013
    Date of Patent: August 15, 2017
    Assignee: TGK CO., LTD.
    Inventors: Shinji Saeki, Yuuki Kaneko, Masaaki Tonegawa
  • Patent number: 9551518
    Abstract: A first expansion valve is provided in a first refrigerant circulation passage through which the refrigerant discharged from a compressor is able to circulate by passing sequentially through an external heat exchanger and an evaporator and returning to the compressor. A second expansion valve is provided in a second refrigerant circulation passage through which the refrigerant discharged from the compressor is able to circulate by passing sequentially through an auxiliary condenser and the external heat exchanger and returning to the compressor. The second expansion valve regulates the valve opening degree such that the refrigerant state at an inlet side of the compressor during a heating operation is in a range where the dryness of refrigerant is greater than or equal to 0.9 and the superheat of refrigerant is less than or equal to 5° C.
    Type: Grant
    Filed: April 18, 2014
    Date of Patent: January 24, 2017
    Assignee: TGK Co., Ltd.
    Inventors: Satoshi Hayakawa, Akihiko Yamamoto, Ryouta Sugamura, Masaaki Tonegawa, Toshiyuki Shiota, Shinji Saeki, Takeshi Kaneko, Takanao Kumakura
  • Publication number: 20160290326
    Abstract: A control valve includes: a body having a main passage through which a discharge chamber and a control chamber communicate, and a sub-passage through which the control chamber and a suction chamber communicate; a main valve seat provided in the main passage; a main valve element configured to touch and leave the main valve seat to close and open a main valve; a sub-valve seat provided in the sub-passage; a sub-valve element configured to touch and leave the sub-valve seat to close and open a sub-valve; a solenoid configured to generate a drive force in a valve closing direction of the main valve; an actuating rod for transmitting the drive force of the solenoid to the main valve element and the sub-valve element; a spring for applying a biasing force to the main valve in a valve opening direction; a spring for applying a biasing force to the sub-valve in a valve closing direction; and a differential pressure valve opening mechanism configured to open the sub-valve when a pressure difference between a control
    Type: Application
    Filed: March 23, 2016
    Publication date: October 6, 2016
    Inventors: Ryota Sugamura, Shinji Saeki, Masaaki Tonegawa
  • Publication number: 20160186733
    Abstract: A control valve includes: a body having a port communicating with a discharge chamber, a port communicating with a control chamber, and a main valve hole formed in a passage connecting the ports; a main valve element configured to close and open a valve section by moving toward and away from the main valve hole; a solenoid configured to generate a force for driving the main valve element in valve opening and closing directions of the valve section, power supply to the solenoid being controlled according to pulse width modulation (PWM); and a vibration absorbing structure including a spring connected with a plunger configured to be displaced integrally with the main valve element, and a weight connected with the plunger with the spring therebetween in a relatively displaceable manner, and configured to suppress vibration of the main valve element caused by the PWM control.
    Type: Application
    Filed: December 14, 2015
    Publication date: June 30, 2016
    Inventors: Ryota Sugamura, Masaaki Tonegawa, Hidekazu Sakakibara
  • Patent number: 9285046
    Abstract: An expansion valve according to one embodiment includes a body having an internal passage through which the working fluid flows, a valve hole provided in the internal passage, a driven member that opens and closes a valve section by touching and leaving the valve hole, a guide member that slidably supports the driven member inserted along the guide member, and a shield wall, provided in the driven member, which closes one end opening of the spacing between the driven member and the guide member when the valve section is fully opened.
    Type: Grant
    Filed: May 22, 2013
    Date of Patent: March 15, 2016
    Assignee: TGK CO., LTD
    Inventor: Masaaki Tonegawa
  • Patent number: 9285054
    Abstract: A control valve according to an embodiment includes a guide member of a cylindrical shape extending coaxially with a valve hole, a valve element of a bottomed cylindrical shape for opening and closing a valve section such that the valve element touches and leaves the valve hole, and a pressure-canceling structure for canceling out at least part of pressure acting on the valve element by introducing a working fluid into a back pressure chamber via a leak passage, the pressure-canceling structure including the back pressure chamber, surrounded by the valve element and the guide member, and the leak passage communicating between the valve hole and the back pressure chamber. A sliding portion and a spacing are formed in an overlapped portion which is a region overlapped by the valve element and the guide member.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: March 15, 2016
    Assignee: TGK CO., LTD.
    Inventors: Michio Matsumoto, Isao Sendo, Masaaki Tonegawa
  • Publication number: 20150010410
    Abstract: In a control valve, the spring load of a spring, which biases a main valve element in a valve opening direction, is regulated, for instance. This allows a range of suction pressures Ps, where a main valve and a sub-valve are simultaneously closed until a sub-valve element is lifted from a sub-valve seat after a main valve element has been seated on a main valve seat, to be set as a deadband. The control valve is configured such that the value of a suction pressure Ps with which to open the sub-valve after the closing of the main valve and the pressure values at which the deadband takes place are set variably by the setting of a value of current supplied to the solenoid.
    Type: Application
    Filed: July 3, 2014
    Publication date: January 8, 2015
    Inventors: Shinji Saeki, Masaaki Tonegawa