Patents by Inventor Yuji Hirase

Yuji Hirase 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: 11965495
    Abstract: A working vehicle includes: a vehicle body provided with a traveling device; a hydraulic pump including a swashplate configured to change an output of the hydraulic pump according to a swashplate angle; a traveling motor including an output shaft having a rotation speed variable according to the output of the hydraulic pump and capable of transmitting power of the output shaft to the traveling device; an angle detector configured to detect the swashplate angle that is an angle of the swashplate; and a swashplate control unit configured to control the swashplate angle on the basis of control information relating to control of the swashplate angle and an actual swashplate angle that is the swashplate angle detected by the angle detector.
    Type: Grant
    Filed: March 15, 2022
    Date of Patent: April 23, 2024
    Assignee: KUBOTA CORPORATION
    Inventors: Tsuyoshi Gono, Naoya Nihei, Yuji Hirase, Susumu Takeoka, Keiji Takahashi
  • Publication number: 20230391176
    Abstract: A work vehicle includes: a front wheel; a rear travel device; a travel body supported by the front wheel and the rear travel device; a driving section provided in the travel body and having an occupant floor section; a travel power transmission device configured to transmit power to the rear travel device; at least one electric motor coupled to the travel power transmission device; a first inverter connected to the at least one electric motor; and a second inverter connected to the at least one electric motor.
    Type: Application
    Filed: March 31, 2023
    Publication date: December 7, 2023
    Applicant: KUBOTA CORPORATION
    Inventors: Yuji HIRASE, Sumio YAGYU, Kazuto OKAZAKI, Tsunehiro II
  • Publication number: 20230391408
    Abstract: A work vehicle includes: a travel device supporting a body; a battery; a motor configured to supply motive power to the travel device; an inverter configured to enable the motor to operate; a cabin supported by the body and housing a driving section that includes a driver seat; and an air conditioner configured to condition air inside the cabin. The inverter is inside the cabin.
    Type: Application
    Filed: March 31, 2023
    Publication date: December 7, 2023
    Applicant: KUBOTA CORPORATION
    Inventors: Yuji HIRASE, Sumio YAGYU, Kazuto OKAZAKI, Tsunehiro II
  • Publication number: 20230391182
    Abstract: A work vehicle includes: a travel device; a battery; a motor configured to supply motive power to the travel device; an inverter configured to enable the motor to operate; a first storage section configured to store a first coolant; and a second storage section configured to store a second coolant. The first coolant in the first storage section is supplied to the motor by the first pump, and returns from the motor to the first storage section, and the second coolant in the second storage section is supplied to the inverter by the second pump, and returns from the inverter to the second storage section.
    Type: Application
    Filed: April 5, 2023
    Publication date: December 7, 2023
    Applicant: KUBOTA CORPORATION
    Inventors: Yuji HIRASE, Sumio YAGYU, Kazuto OKAZAKI, Tsunehiro II
  • Publication number: 20230391212
    Abstract: A work vehicle including: a front wheel; a rear travel device; a travel body supported by the front wheel and the rear travel device; a driving section provided in the travel body and having an occupant floor section; a transmission configured to output power to the rear travel device; a transmission case housing the transmission; an electric motor coupled to the transmission; and an inverter connected to the electric motor, wherein: the inverter is provided between the front wheel and the rear travel device, under the floor section, and laterally of the transmission case.
    Type: Application
    Filed: April 12, 2023
    Publication date: December 7, 2023
    Applicant: KUBOTA CORPORATION
    Inventors: Yuji HIRASE, Sumio YAGYU, Kazuto OKAZAKI, Tsunehiro II
  • Patent number: 11815168
    Abstract: A work vehicle includes a vehicle body provided with a travel device; a prime mover provided in the vehicle body; a transmission device capable of speed-changing a driving force from the prime mover and transmitting the driving force to the travel device; a transmission case housing the transmission device and being filled with lubricating oil; and a control device capable of switching between a warm-up operation mode in which a gear of the transmission device is rotated in a state in which transmission of power from the transmission device to the travel device is blocked and a travel operation mode in which the gear is rotated in a state in which the power is transmitted from the transmission device to the travel device.
    Type: Grant
    Filed: May 24, 2022
    Date of Patent: November 14, 2023
    Assignee: KUBOTA CORPORATION
    Inventors: Tsuyoshi Gono, Yuji Hirase, Atsushi Jinnai, Susumu Takeoka, Masahiro Sakaguchi, Kazuma Ishihara
  • Publication number: 20230286369
    Abstract: A hybrid transmission includes an electric transmission and a gear transmission. The electric transmission includes a first motor generator and a second motor generator. The second motor generator is on a side of the first motor generator on which side the gear transmission is located. An output transmission to transmit the output from the second motor generator to the gear transmission is on the side of the second motor generator on which side the gear transmission is located.
    Type: Application
    Filed: December 15, 2022
    Publication date: September 14, 2023
    Inventors: Yuji HIRASE, Sumio YAGYU, Kazuto OKAZAKI, Tsunehiro II
  • Publication number: 20230286371
    Abstract: A work vehicle includes a hybrid transmission to vary power from an engine and output the power to a travel device, the hybrid transmission including an electric transmission including a motor generator and a gear transmission including a gear driver. The work vehicle includes an inverter to drive the motor generator. The work vehicle includes a pump to cool the inverter by supplying, to the inverter, a refrigerant to cool the motor generator.
    Type: Application
    Filed: December 14, 2022
    Publication date: September 14, 2023
    Inventors: Yuji HIRASE, Sumio YAGYU, Kazuto OKAZAKI, Tsunehiro II
  • Publication number: 20230286368
    Abstract: A hybrid transmission includes an electric transmission including a motor generator, and a gear transmission including a gear driver without a motor generator. A transmission case includes an electric transmission chamber in which the electric transmission is accommodated, and a gear transmission chamber in which the gear transmission is accommodated, the electric transmission chamber and the gear transmission chamber being adjacent to each other. The transmission case includes a partition wall separating the electric transmission chamber from the gear transmission chamber in a non-communication manner.
    Type: Application
    Filed: December 14, 2022
    Publication date: September 14, 2023
    Inventors: Yuji HIRASE, Sumio YAGYU, Kazuto OKAZAKI, Tsunehiro II
  • Patent number: 11629781
    Abstract: A work vehicle includes a hydrostatic stepless speed changer device configured to speed-change driving power of an engine steplessly, a plurality of planetary gear speed changer devices configured to speed-change the driving power speed-changed by the stepless speed changer device, a plurality of clutch mechanisms corresponding to the plurality of planetary gear speed changer devices in order to take off the driving powers from these plurality of planetary gear speed changer devices individually, and a traveling speed changer device for speed-changing and transmitting the driving powers transmitted from the plurality of clutch mechanisms to a traveling mechanism. The plurality of planetary gear speed changer devices the plurality of clutch mechanisms and the traveling speed changer device are accommodated in a transmission case.
    Type: Grant
    Filed: December 6, 2019
    Date of Patent: April 18, 2023
    Assignee: KUBOTA CORPORATION
    Inventors: Yuji Hirase, Ryoma Iwase, Tsuyoshi Gono, Takuya Nishikubo, Susumu Takeoka, Tsubasa Kawazoe, Atsushi Jinnai
  • Publication number: 20220290748
    Abstract: A work vehicle includes a vehicle body provided with a travel device; a prime mover provided in the vehicle body; a transmission device capable of speed-changing a driving force from the prime mover and transmitting the driving force to the travel device; a transmission case housing the transmission device and being filled with lubricating oil; and a control device capable of switching between a warm-up operation mode in which a gear of the transmission device is rotated in a state in which transmission of power from the transmission device to the travel device is blocked and a travel operation mode in which the gear is rotated in a state in which the power is transmitted from the transmission device to the travel device.
    Type: Application
    Filed: May 24, 2022
    Publication date: September 15, 2022
    Applicant: KUBOTA CORPORATION
    Inventors: Tsuyoshi GONO, Yuji HIRASE, Atsushi JINNAI, Susumu TAKEOKA, Masahiro SAKAGUCHI, Kazuma ISHIHARA
  • Publication number: 20220196147
    Abstract: A working vehicle includes: a vehicle body provided with a traveling device; a hydraulic pump including a swashplate configured to change an output of the hydraulic pump according to a swashplate angle; a traveling motor including an output shaft having a rotation speed variable according to the output of the hydraulic pump and capable of transmitting power of the output shaft to the traveling device; an angle detector configured to detect the swashplate angle that is an angle of the swashplate; and a swashplate control unit configured to control the swashplate angle on the basis of control information relating to control of the swashplate angle and an actual swashplate angle that is the swashplate angle detected by the angle detector.
    Type: Application
    Filed: March 15, 2022
    Publication date: June 23, 2022
    Applicant: KUBOTA CORPORATION
    Inventors: Tsuyoshi GONO, Naoya NIHEI, Yuji HIRASE, Susumu TAKEOKA, Keiji TAKAHASHI
  • Publication number: 20210364074
    Abstract: A work vehicle includes a hydrostatic stepless speed changer device configured to speed-change driving power of an engine steplessly, a plurality of planetary gear speed changer devices configured to speed-change the driving power speed-changed by the stepless speed changer device, a plurality of clutch mechanisms corresponding to the plurality of planetary gear speed changer devices in order to take off the driving powers from these plurality of planetary gear speed changer devices individually, and a traveling speed changer device for speed-changing and transmitting the driving powers transmitted from the plurality of clutch mechanisms to a traveling mechanism. The plurality of planetary gear speed changer devices the plurality of clutch mechanisms, and the traveling speed changer device are accommodated in a transmission case.
    Type: Application
    Filed: December 6, 2019
    Publication date: November 25, 2021
    Applicant: KUBOTA CORPORATION
    Inventors: Yuji HIRASE, Ryoma IWASE, Tsuyoshi GONO, Takuya NISHIKUBO, Susumu TAKEOKA, Tsubasa KAWAZOE, Atsushi JINNAI
  • Patent number: 9945464
    Abstract: A transmission apparatus D that can avoid size-up of a starter through reduction of load torque required at the time of start-up of an engine, includes a traveling transmission device D1 configured to transmit power outputted from an engine 3a via a forward/reverse switching mechanism 50 acting also as a main clutch mechanism, a hydrostatic stepless speed changer mechanism 20 acting as a main speed changer mechanism, a planetary gear mechanism 40 and an auxiliary speed changer mechanism 60 to traveling components such as front wheels 1, rear wheels 2, etc., and an implement transmission device D2 configured to transmit the power outputted from the engine 3a via an implement clutch 70, an implement speed changer mechanism 71, and a PTO shaft 7 to an implement.
    Type: Grant
    Filed: April 18, 2016
    Date of Patent: April 17, 2018
    Assignee: Kubota Corporation
    Inventors: Yuji Hirase, Hidetoshi Hana, Tsuyoshi Gono
  • Publication number: 20160312872
    Abstract: A transmission apparatus D that can avoid size-up of a starter through reduction of load torque required at the time of start-up of an engine, includes a traveling transmission device D1 configured to transmit power outputted from an engine 3a via a forward/reverse switching mechanism 50 acting also as a main clutch mechanism, a hydrostatic stepless speed changer mechanism 20 acting as a main speed changer mechanism, a planetary gear mechanism 40 and an auxiliary speed changer mechanism 60 to traveling components such as front wheels 1, rear wheels 2, etc., and an implement transmission device D2 configured to transmit the power outputted from the engine 3a via an implement clutch 70, an implement speed changer mechanism 71, and a PTO shaft 7 to an implement.
    Type: Application
    Filed: April 18, 2016
    Publication date: October 27, 2016
    Inventors: Yuji Hirase, Hidetoshi Hana, Tsuyoshi Gono