Patents by Inventor Koichiro Akatsuka

Koichiro Akatsuka 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).

  • Publication number: 20210348620
    Abstract: An electric pump provided with a pump unit configured to discharge working oil by being rotationally driven by an electric motor includes: a drive shaft configured to transmit rotational driving force from the electric motor to a rotor of the pump unit; a rotation-detection shaft provided coaxially with the drive shaft, the rotation-detection shaft being configured to be rotated together with the rotor; and a rotation detector unit configured to detect rotation of the rotation-detection shaft. The rotation-detection shaft has: an engagement portion configured to engage with the rotor; and a detection-target portion facing the rotation detector unit, and an outer diameter of the detection-target portion is set so as to be larger than an outer diameter of the engagement portion.
    Type: Application
    Filed: October 29, 2019
    Publication date: November 11, 2021
    Applicants: KYB Corporation, NIDEC TOSOK CORPORATION
    Inventors: Kohei KUBO, Tomoyuki FUJITA, Koichiro AKATSUKA, Yoshiyuki MAKI, Koji HIGUCHI, Yutaka HASHIMOTO
  • Publication number: 20200347844
    Abstract: A vane pump includes a rotor having slits, vanes received in the slits, a cam ring having an inner circumference cam face with which the vanes are brought into sliding contact, side members, pump chamber formed by the rotor, the cam ring, adjacent vanes, and back pressure chambers formed in the slits by the vanes. In the vane pump, the side members are provided with back pressure opening portions opening at sliding-contact surfaces in sliding contact with the rotor, the back pressure opening portions being configured to communicate with the back pressure chambers, and protruding opening portions protruding along the rotating direction of the rotor from end portions of the back pressure opening portions on the communication-finishing side. And inner-side inner circumferential surfaces of the protruding opening portions are respectively connected to inner-side inner circumferential surfaces of the back pressure opening portions.
    Type: Application
    Filed: November 9, 2018
    Publication date: November 5, 2020
    Applicant: KYB Corporation
    Inventors: Fumiyasu KATO, Koichiro AKATSUKA
  • Publication number: 20190390670
    Abstract: A vane pump includes: a rotor connected to a driving shaft; a plurality of vanes provided so as to be capable of reciprocating in a radial direction with respect to the rotor; a cam ring having a cam face on which a tip-ends of the vanes slide with the rotation of the rotor, the cam ring being provided so as to be capable of being made eccentric with respect to the rotor; a second pump body configured to accommodate the cam ring; and a spring interposed between the cam ring and the second pump body in a compressed state, the spring being configured to bias the cam ring in the direction in which the amount of eccentricity with respect to the rotor is increased. The cam ring and the second pump body have seating surfaces on which the spring is seated and grooves formed in the seating surfaces.
    Type: Application
    Filed: September 8, 2017
    Publication date: December 26, 2019
    Applicant: KYB Corporation
    Inventors: Koichiro AKATSUKA, Hiroki GOMI, Fumihiko SOBUE
  • Publication number: 20190301452
    Abstract: A vane pump includes a pump rotor having a through hole to which a driving shaft is coupled, a pump housing configured to accommodate the pump rotor and the cam ring, and a first side plate provided between the pump rotor and a bottom surface of the pump housing. The first side plate or the pump housing is formed with a projection, the projection is inserted into the through hole of the pump rotor.
    Type: Application
    Filed: November 8, 2017
    Publication date: October 3, 2019
    Applicant: KYB Corporation
    Inventors: Koichiro AKATSUKA, Yoshiyuki MAKI
  • Publication number: 20180306184
    Abstract: A vane pump includes a rotor; a plurality of vanes; a cam ring; a second side plate; a suction port provided in the second side plate, the suction port being configured to guide working fluid to the pump chambers; a pump cover arranged so as to sandwich the second side plate with the cam ring; and a low-pressure chamber formed in the pump cover, the low-pressure chamber having an opening portion communicating with the suction port. The suction port is arranged so as to be shifted towards a forward side of in a rotating direction of the rotor with respect to the opening portion of the low-pressure chamber.
    Type: Application
    Filed: September 16, 2016
    Publication date: October 25, 2018
    Applicant: KYB Corporation
    Inventors: Yoshinari NAKAMURA, Shinji YAKABE, Kazunari SUZUKI, Koichiro AKATSUKA, Hirohito WATANABE
  • Publication number: 20180258931
    Abstract: A vane pump includes a pump cartridge that is accommodated in an accommodating space defined by the concave portion and the pump cover. The pump cartridge includes a first side plate that is provided between the bottom portion of the concave portion in the pump body and a cam ring; first pins that are provided so as to extend from the cam ring to the first side plate; and second pins that are provided so as to extend from the first side plate to the pump body.
    Type: Application
    Filed: August 29, 2016
    Publication date: September 13, 2018
    Applicant: KYB Corporation
    Inventors: Koichiro AKATSUKA, Tomoyuki FUJITA, Hiroki GOMI, Shota SHINDO
  • Publication number: 20180149153
    Abstract: A pump device includes: a main pump and a sub pump; and a switching valve that switches so as to supply the hydraulic oil discharged from the sub pump to the hydraulic device, or to return the hydraulic oil discharged from the sub pump to the suction side. The main pump and the sub pump each include: a rotor, a discharge port into which the hydraulic oil discharged from a pump chamber is led, and a groove-shaped discharge-side notch formed from an opening edge of the discharge port toward a direction opposite to a rotation direction of the rotor. The switching valve switches according to a rotation speed of the drive shaft. At least one discharge-side notch of the sub pump is formed so that a resistance applied to the flow of the hydraulic oil passing therethrough is greater than that of the discharge-side notch of the main pump.
    Type: Application
    Filed: June 1, 2016
    Publication date: May 31, 2018
    Applicant: KYB Corporation
    Inventors: Koichiro AKATSUKA, Tomoyuki FUJITA, Tomoyuki NAKAGAWA, Fumiyasu KATOU, Hiroki GOMI
  • Publication number: 20180112661
    Abstract: A variable displacement vane pump includes: a control orifice that imparts resistance to a flow of working oil discharged from pump chambers; a flow-amount control valve that operates in accordance with an upstream-downstream differential pressure of the control orifice and controls a flow amount of the working oil discharged from the pump chambers; a variable control valve that is operated by the working oil that has passed through the control orifice and controls an amount of eccentricity of a cam ring with respect to a rotor by controlling a pressure difference between a first fluid pressure chamber and a second fluid pressure chamber; and a return passage that is connected to the flow-amount control valve and circulates a part of the working oil discharged from the pump chambers through a suction passage.
    Type: Application
    Filed: April 19, 2016
    Publication date: April 26, 2018
    Applicant: KYB Corporation
    Inventors: Koichiro AKATSUKA, Tomoyuki FUJITA, Tomoyuki NAKAGAWA, Fumiyasu KATOU, Hiroki GOMI
  • Patent number: 9897086
    Abstract: A vane pump used as a fluid pressure source includes: a rotor that is rotationally driven; a plurality of vanes that are inserted into the rotor in a freely slidable manner; a cam ring at which tip-end portions of the vanes slides as the rotor rotates; a pump chamber that is defined between the adjacent vanes; a suction port that guides working fluid to the pump chamber; a discharge port through which the working fluid discharged from the pump chamber is guided; a groove-like notch that extends from an opening edge of the discharge port in an opposite direction from rotation direction of the rotor, and the notch has a gradient-changing portion at which a rate of change of opening area is decreased in the rotation direction of the rotor.
    Type: Grant
    Filed: January 19, 2015
    Date of Patent: February 20, 2018
    Assignee: KYB Corporation
    Inventors: Tomoyuki Fujita, Koichiro Akatsuka, Fumiyasu Kato, Hiroki Gomi
  • Patent number: 9879670
    Abstract: A vane pump includes a rotor, vanes, pump chambers, a suction port, and a discharge port. The side member has a first transition section and a second transition section. The first transition section is a section from an end point of the suction port to a start point of the discharge port. The second transition section is a section from an end point of the discharge port to a start point of the suction port. An angle between the start point and the end point of the suction port is set such that a pressurizing timing is offset from a depressurizing timing. The pressurizing timing is a timing at which one pump chamber starts to communicate with the discharge port from the first transition section, and the depressurizing timing is a timing at which another pump chamber starts to communicate with the suction port from the second transition section.
    Type: Grant
    Filed: February 5, 2014
    Date of Patent: January 30, 2018
    Assignee: KYB Corporation
    Inventors: Koichiro Akatsuka, Tomoyuki Fujita, Fumiyasu Kato
  • Publication number: 20170227007
    Abstract: A pump device includes a flow control valve that returns a part of working fluid discharged from a pump to the suction side, and the flow control valve includes a valve body, a first fluid pressure chamber that is provided so as to face against a first-side end surface of the valve body and that is communicated with a discharge channel, a second fluid pressure chamber that is provided so as to face against a second-side end surface of the valve body and that is communicated with the discharge channel, a biasing member that is accommodated in the second fluid pressure chamber for biasing the valve body in the valve-closing direction, and a pressure regulator that is provided in a communicating passage through which the discharge channel is communicated with the second fluid pressure chamber and that adjusts pressure in the second fluid pressure chamber.
    Type: Application
    Filed: August 24, 2015
    Publication date: August 10, 2017
    Applicant: KYB Corporation
    Inventors: Koichiro AKATSUKA, Tomoyuki FUJITA, Tomoyuki NAKAGAWA, Fumiyasu KATOU, Hiroki GOMI
  • Patent number: 9664188
    Abstract: A variable displacement vane pump includes: a rotor to be rotatively driven; a plurality of vanes slidably housed in the rotor; a cam ring allowed of eccentric with respect to a center of the rotor, the cam ring having an inner circumferential cam surface in sliding contact with a distal end portion of the vane; a pump chamber defined by the adjacent vanes, the rotor, and the cam ring; a suction port to guide hydraulic fluid to be suctioned to the pump chamber; and a discharge port to guide hydraulic fluid to be discharged from the pump chamber. An outer circumference of an opening portion of the suction port is formed so as to be positioned along the inner circumferential cam surface of the cam ring or at an outside of the inner circumferential cam surface regardless of eccentricity of the cam ring with respect to the rotor.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: May 30, 2017
    Assignee: KYB Corporation
    Inventors: Tomoyuki Fujita, Masamichi Sugihara, Koichiro Akatsuka, Fumiyasu Kato
  • Patent number: 9644626
    Abstract: A vane pump includes: a rotor; vanes; a cam ring; pump chambers; a suction port; a discharge port; back-pressure chambers; a discharge-side back pressure port configured to guide working fluid that is discharged from the discharge port to the back-pressure chambers; and suction-side back pressure ports configured to guide the working fluid to the back-pressure chambers. The suction-side back pressure ports are formed to be divided into a low-pressure port and a high-pressure port, the low-pressure port being configured to guide the working fluid in the suction port to the back-pressure chambers, and the high-pressure port being configured to guide the working fluid that is discharged from the discharge port to the back-pressure chambers. The high-pressure port is arranged at the forward-side of the low-pressure port in rotating direction of the rotor.
    Type: Grant
    Filed: February 27, 2014
    Date of Patent: May 9, 2017
    Assignee: KYB Corporation
    Inventors: Koichiro Akatsuka, Tomoyuki Fujita, Fumiyasu Kato
  • Patent number: 9611848
    Abstract: A variable displacement vane pump includes a rotor, vanes, a cam ring, pump chambers, a suction port, a discharge port, back pressure chambers, a plate that has a sliding contact surface and a penetrating hole, a suction-side back pressure port being configured to guide the working fluid in the suction port to the back pressure chambers in a suction section, a discharge-side back pressure port being configured to guide the working fluid that is discharged from the discharge port to the back pressure chambers in a discharge section, an additional groove provided on the sliding contact surface so as to extend from between the discharge-side back pressure port and the penetrating hole to between the suction-side back pressure port and the penetrating hole, and a connection groove that communicates the additional groove with the suction-side back pressure port.
    Type: Grant
    Filed: February 27, 2014
    Date of Patent: April 4, 2017
    Assignee: KYB Corporation
    Inventors: Koichiro Akatsuka, Tomoyuki Fujita, Fumiyasu Kato
  • Patent number: 9581159
    Abstract: An electric oil pump includes an electric motor and an oil pump that is driven by the motive power from an electric motor, wherein; the oil pump has an introducing channel that guides a drain oil that has leaked from an interior of the oil pump to an interior of the electric motor; and the electric motor has a discharging channel that discharges the drain oil that has been guided to the interior of the electric motor to a tank.
    Type: Grant
    Filed: November 28, 2012
    Date of Patent: February 28, 2017
    Assignee: KYB Corporation
    Inventors: Masamichi Sugihara, Tomoyuki Fujita, Koichiro Akatsuka
  • Patent number: 9567997
    Abstract: In a variable capacity type vane pump in which a cam ring pivots, a discharge port is so formed that an absolute value of a difference between a discharge port start edge line inclination angle and a discharge port end edge line inclination angle is larger than a vane angle.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: February 14, 2017
    Assignee: KYB Corporation
    Inventors: Koichiro Akatsuka, Tomoyuki Fujita, Masamichi Sugihara, Fumiyasu Kato
  • Patent number: 9534595
    Abstract: A variable displacement vane pump includes: an adapter ring (a cam ring housing member) that defines a first fluid pressure chamber and a second fluid pressure chamber relative to an outer periphery of a cam ring, the cam ring being moved relative to a rotor by a differential pressure between the first fluid pressure chamber and the second fluid pressure chamber; a seal housing groove formed in an inner periphery of the adapter ring; and a slipper seal which is inserted into the seal housing groove and with which an outer periphery of the cam ring comes into sliding contact when the cam ring moves, whereby the slipper seal partitions the first fluid pressure chamber from the second fluid pressure chamber, wherein the slipper seal is formed in a thin plate shape having a square cross-section.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: January 3, 2017
    Assignee: KYB Corporation
    Inventors: Koichiro Akatsuka, Tomoyuki Fujita, Masamichi Sugihara, Fumiyasu Kato
  • Publication number: 20160377078
    Abstract: A pump device includes a pump, a flow control valve having a spool that returns a part of working fluid discharged from the pump to a suction side, and a differential pressure adjusting device that adjusts a differential pressure acting on both end portions of the spool to a target differential pressure, and the differential pressure adjusting device includes a pressure regulating chamber that communicates with a second fluid pressure chamber and a pilot chamber into which pressure in the discharge channel is guided: and a pressure in the pressure regulating chamber is adjusted such that a differential pressure between the pressure in the pressure regulating chamber and a pressure in the pilot chamber becomes the target differential pressure.
    Type: Application
    Filed: September 2, 2015
    Publication date: December 29, 2016
    Applicant: KYB Corporation
    Inventors: Koichiro AKATSUKA, Tomoyuki FUJITA, Tomoyuki NAKAGAWA, Fumiyasu KATOU, Hiroki GOMI
  • Publication number: 20160333876
    Abstract: A vane pump used as a fluid pressure source includes: a rotor that is rotationally driven; a plurality of vanes that are inserted into the rotor in a freely slidable manner; a cam ring at which tip-end portions of the vanes slides as the rotor rotates; a pump chamber that is defined between the adjacent vanes; a suction port that guides working fluid to the pump chamber; a discharge port through which the working fluid discharged from the pump chamber is guided; a groove-like notch that extends from an opening edge of the discharge port in an opposite direction from rotation direction of the rotor, and the notch has a gradient-changing portion at which a rate of change of opening area is decreased in the rotation direction of the rotor.
    Type: Application
    Filed: January 19, 2015
    Publication date: November 17, 2016
    Applicant: KYB CORPORATION
    Inventors: Tomoyuki FUJITA, Koichiro AKATSUKA, Fumiyasu KATO, Hiroki GOMI
  • Patent number: 9488175
    Abstract: A variable capacity type vane pump with a first fluid pressure chamber and a second fluid pressure chamber provided at opposite sides of a pivot point of a cam ring includes a control valve for controlling a drive pressure of working fluid introduced from a pump chamber to the second fluid pressure chamber, a suction pressure of the working fluid sucked into the pump chamber is constantly introduced to the first fluid pressure chamber, and the cam ring pivots in a direction to decrease a discharge capacity due to a pressure in the pump chamber acting on an inner peripheral cam surface during an operation to reduce the drive pressure, whereas the cam ring pivots in a direction to increase the discharge capacity during an operation to increase the drive pressure.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: November 8, 2016
    Assignee: KYB Corporation
    Inventors: Koichiro Akatsuka, Tomoyuki Fujita, Masamichi Sugihara, Fumiyasu Kato