Patents by Inventor Ryoma IWASE
Ryoma IWASE 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: 11994201Abstract: A power transmission device for a work vehicle includes a transmission case, a gear transmission housed in the transmission case and configured to transmit power to a travel device, and a transmission gear provided in the gear transmission in a state of sitting in lubricating oil stored in an internal space of the transmission case, the transmission case being provided with a wall part supporting a support shaft of the transmission gear in a state of being adjacent to the transmission gear, and the wall part being provided with a cover part protruding toward the outer periphery of the transmission gear from the wall part and covering the transmission gear.Type: GrantFiled: November 12, 2021Date of Patent: May 28, 2024Assignee: KUBOTA CORPORATIONInventors: Tomonari Tsuchida, Atsuro Hayami, Hiroyuki Sadamoto, Keitaro Morinaga, Kazuhiro Wada, Rikuto Araki, Ryoma Iwase, Tomoyuki Tanaka, Takahiro Matsuo, Hiroyuki Aikawa
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Publication number: 20240167549Abstract: A continuously variable powertrain device for a work vehicle includes a continuously variable transmission to output a continuously shifted motive power while continuously varying a speed of a motive power received from an engine, a planetary transmission to receive the motive power from the engine and the continuously shifted motive power and to output a compound motive power, a planetary clutch to switch a shift level of the planetary transmission a forward-reverse direction switch to receive the compound motive power and to output either a forward motive power or a reverse motive power, rotation detectors, and a powertrain controller.Type: ApplicationFiled: November 7, 2023Publication date: May 23, 2024Inventors: Tetsuo YAMAGUCHI, Ryoma IWASE, Tomonari TSUCHIDA
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Publication number: 20240167566Abstract: A work vehicle includes a restrainer vehicle speed setter to set a restrainer vehicle speed, and a switch restrainer to permit switching of the forward/backward travel switching device while a detected vehicle speed is lower than the restrainer vehicle speed and prevent switching of the forward/backward travel switching device while the detected vehicle speed is a high speed not lower than the restrainer vehicle speed.Type: ApplicationFiled: November 16, 2023Publication date: May 23, 2024Inventors: Tetsuo YAMAGUCHI, Ryoma IWASE
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Publication number: 20240166211Abstract: A work vehicle includes a controller configured or programmed to include an input revolutions number calculator to calculate an input revolutions number, and a vehicle speed controller switchable between a first vehicle-speed control mode and a second vehicle-speed control mode. In the first vehicle-speed control mode, the vehicle speed controller is configured or programmed to control a vehicle speed of the work vehicle based on a value detected by an input rotation sensor. In the second vehicle-speed control mode, the vehicle speed controller is configured or programmed to control the vehicle speed based on a value calculated by the input revolutions number calculator.Type: ApplicationFiled: November 16, 2023Publication date: May 23, 2024Inventors: Tetsuo YAMAGUCHI, Ryoma IWASE, Tomonari TSUCHIDA
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Publication number: 20240167565Abstract: An electromagnetic valve control device includes a control signal generator to, through feedback control involving an environmental coefficient, generate a control signal intended for at least one electromagnetic valve and corresponding to a target electric current value, a coefficient determiner to determine an environmental coefficient during a learning period from a start of a driver operation to an end of a predetermined time, and an operation limiter to limit respective operations of the at least one electromagnetic valve and a gear transmission during the learning period.Type: ApplicationFiled: October 16, 2023Publication date: May 23, 2024Inventors: Tetsuo YAMAGUCHI, Ryoma IWASE
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Publication number: 20240167550Abstract: A continuously variable powertrain device for a work vehicle includes a hydraulic static transmission to output a continuously shifted motive power while continuously varying a velocity of a motive power received from an engine, a planetary transmission to receive the motive power from the engine and the continuously shifted motive power and to output a compound motive power, a pressure detector to detect a hydraulic pressure in a closed circuit of the hydraulic static transmission, a planetary clutch mechanism to switch a shift level of the planetary transmission, and a powertrain controller to control actuation of the hydraulic static transmission and the planetary transmission based on a shift command.Type: ApplicationFiled: November 7, 2023Publication date: May 23, 2024Inventors: Tetsuo YAMAGUCHI, Ryoma IWASE
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Publication number: 20240167562Abstract: An electromagnetic valve control device includes a current gear ratio obtainer to obtain a current gear ratio as a ratio of an output revolutions number of a driver and an output revolutions number of a transmission, a current electric current value obtainer to obtain a current electric current value as a value of an electric current to be inputted to a first electromagnetic valve or a second electromagnetic valve, and a switching controller to, based on the current electric current value and a gear ratio difference as a difference between a target gear ratio and the current gear ratio, perform electromagnetic valve switching control to switch between use of the first electromagnetic valve to control a pump swash plate and use of the second electromagnetic valve to control the pump swash plate.Type: ApplicationFiled: October 12, 2023Publication date: May 23, 2024Inventors: Tetsuo YAMAGUCHI, Ryoma IWASE
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Publication number: 20230407962Abstract: A work vehicle includes: a power transmission shaft drivable to rotate; a shaft holder holding the power transmission shaft in such a manner that the power transmission shaft is rotatable; and a hydraulically operable section configured to operate in response to receiving operating oil, the power transmission shaft including: a shaft groove extending entirely around an outer circumferential portion of the power transmission shaft; an inlet port extending inside the power transmission shaft in a radial direction of the power transmission shaft and connected with the shaft groove; and a supply oil passage extending inside the power transmission shaft in a longitudinal direction of the power transmission shaft and connected with the inlet port inside the power transmission shaft.Type: ApplicationFiled: May 25, 2023Publication date: December 21, 2023Applicant: KUBOTA CORPORATIONInventors: Atsushi JINNAI, Ryoma IWASE, Yusuke NABANA, Rikuto ARAKI, Makoto KUBOTA
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Publication number: 20230271497Abstract: A traveling transmission device of a tractor including a transmission case to which power from an engine is inputted via an input shaft, a speed changer transmission section provided inside the transmission case and configured to input power from the input shaft and to speed-change the inputted power and output it, and a rear wheel differential mechanism provided inside the transmission case and configured to input power outputted from the speed changer transmission section and transmit the inputted power to left and right rear wheels. The speed changer transmission section includes a plurality of speed changer sections configured to speed-change power from the input shaft by a gear coupling mechanism and a multiple-disc clutch and output it, and, inside the transmission case, an oil feeding pipe extends upwardly of the speed changer transmission section and a discharge nozzle connects to respective portions of the plurality of speed changer sections.Type: ApplicationFiled: May 5, 2023Publication date: August 31, 2023Applicant: KUBOTA CORPORATIONInventors: Tomonari TSUCHIDA, Ryoma IWASE, Tomoyuki TANAKA, Takahiro MATSUO, Hidetoshi HANA
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Patent number: 11718173Abstract: Provided are a speed changer device, a forward/reverse switchover device for converting output of the speed changer device into forward traveling power and reverse traveling power, a rear wheel differential mechanism for inputting output of the forward/reverse switchover device and transmitting it to rear wheels, and a gear transmission mechanism for transmitting power of an output shaft of the forward/reverse switchover device to an input shaft of the rear wheel differential mechanism. A transmission case is separable into a front case portion accommodating the speed changer device and a rear case portion accommodating the forward/reverse switchover device, the rear wheel differential mechanism and the gear transmission mechanism. The gear transmission mechanism is detachably provided at a portion of the inside of the transmission case which portion corresponds to a front end portion of the rear case portion.Type: GrantFiled: September 22, 2020Date of Patent: August 8, 2023Assignee: KUBOTA CORPORATIONInventors: Tomonari Tsuchida, Ryoma Iwase, Tomoyuki Tanaka, Takahiro Matsuo, Hidetoshi Hana
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Publication number: 20230204093Abstract: There is provided a work vehicle including an oil outlet port and a partition part. The oil outlet port opens to a bottom portion in one end side of a transmission case in a vehicle body front-back direction and a vehicle body left-right direction. The oil outlet port takes out a lubricating oil from an interior of the transmission case. The partition part divided an internal space of the transmission case into a first space zone along a sidewall portion of the transmission case, and a second space zone other than the first space zone. The partition part brings the first space zone into a sealed state.Type: ApplicationFiled: November 15, 2022Publication date: June 29, 2023Applicant: KUBOTA CORPORATIONInventors: Tomonari TSUCHIDA, Ryoma IWASE, Tomoyuki TANAKA, Takahiro MATSUO, Hiroyuki AIKAWA
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Publication number: 20230204096Abstract: There is provided a work vehicle including a partition wall to keep partition between a first space zone as part of an internal space of the transmission case in which a differential mechanism is located and a second space zone as part of the internal space which is adjacent to the first space zone. An upper space is disposed above the partition wall and configured to allow lubricating oil scooped up from the first space zone by a ring gear to flow in the second space zone. A flow-out path is disposed below the upper space and configured to allow the lubricating oil to flow out of the second space zone to the first space zone.Type: ApplicationFiled: November 15, 2022Publication date: June 29, 2023Applicant: KUBOTA CORPORATIONInventors: Atsushi JINNAI, Tomonari TSUCHIDA, Ryoma IWASE, Tomoyuki TANAKA, Takahiro MATSUO, Hiroyuki AIKAWA, Atsuro HAYAMI, Keitaro MORINAGA, Yosui NISHIJIMA, Satoru NAGANO, Takuma HOKEGUCHI
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Patent number: 11629781Abstract: 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: GrantFiled: December 6, 2019Date of Patent: April 18, 2023Assignee: KUBOTA CORPORATIONInventors: Yuji Hirase, Ryoma Iwase, Tsuyoshi Gono, Takuya Nishikubo, Susumu Takeoka, Tsubasa Kawazoe, Atsushi Jinnai
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Patent number: 11536356Abstract: A work vehicle includes an engine, a speed changing apparatus that includes a hydrostatic stepless speed changing mechanism and is configured to subject motive power transmitted from the engine to speed changing and output the motive power, a travelling apparatus configured to travel on the motive power received from the speed changing apparatus, a speed detector configured to detect a speed of the travelling apparatus, a pressure detector configured to detect a hydraulic pressure in a closed circuit of the hydrostatic stepless speed changing mechanism, and a controller.Type: GrantFiled: October 29, 2021Date of Patent: December 27, 2022Assignee: KUBOTA CORPORATIONInventors: Tetsuo Yamaguchi, Ryoma Iwase, Komei Yamawaki
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Patent number: 11408486Abstract: A carrier includes a first carrier portion and a second carrier portion. The first carrier portion includes a gear housing space that houses a planetary gear, an opening that opens the gear housing space toward the second carrier portion and allows the planetary gear to fit into the gear housing space, and a first support hole that supports a first end portion of the planetary support shaft. The second carrier portion includes a cover portion that covers the opening, a second support hole that supports a second end portion of the planetary support shaft, and a joining portion that detachably joins the second carrier portion to the first carrier portion. The joining portion is joined to the first carrier portion by being tightened in a direction aligned with a direction of an axial core of a sun gear.Type: GrantFiled: June 7, 2021Date of Patent: August 9, 2022Assignee: KUBOTA CORPORATIONInventors: Tomonari Tsuchida, Ryoma Iwase, Tomoyuki Tanaka, Takahiro Matsuo
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Publication number: 20220205526Abstract: A power transmission device for a work vehicle includes a transmission case, a gear transmission housed in the transmission case and configured to transmit power to a travel device, and a transmission gear provided in the gear transmission in a state of sitting in lubricating oil stored in an internal space of the transmission case, the transmission case being provided with a wall part supporting a support shaft of the transmission gear in a state of being adjacent to the transmission gear, and the wall part being provided with a cover part protruding toward the outer periphery of the transmission gear from the wall part and covering the transmission gear.Type: ApplicationFiled: November 12, 2021Publication date: June 30, 2022Applicant: KUBOTA CORPORATIONInventors: Tomonari TSUCHIDA, Atsuro HAYAMI, Hiroyuki SADAMOTO, Keitaro MORINAGA, Kazuhiro WADA, Rikuto ARAKI, Ryoma IWASE, Tomoyuki TANAKA, Takahiro MATSUO, Hiroyuki AIKAWA
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Publication number: 20220196128Abstract: A work vehicle includes an engine, a speed changing apparatus that includes a hydrostatic stepless speed changing mechanism and is configured to subject motive power transmitted from the engine to speed changing and output the motive power, a travelling apparatus configured to travel on the motive power received from the speed changing apparatus, a speed detector configured to detect a speed of the travelling apparatus, a pressure detector configured to detect a hydraulic pressure in a closed circuit of the hydrostatic stepless speed changing mechanism, and a controller.Type: ApplicationFiled: October 29, 2021Publication date: June 23, 2022Applicant: KUBOTA CORPORATIONInventors: Tetsuo YAMAGUCHI, Ryoma IWASE, Komei YAMAWAKI
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Patent number: 11261951Abstract: A shift power transmission apparatus of a tractor that has a small up-down width or a small transverse width and a short front-rear length. A shift output unit is located further toward a vehicle rear side than a combined planetary power transmission unit. A planetary unit output axis and a shift unit input axis are coaxial with each other.Type: GrantFiled: November 20, 2018Date of Patent: March 1, 2022Assignee: Kubota CorporationInventors: Tomonari Tsuchida, Hidetoshi Hana, Ryoma Iwase
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Publication number: 20210404534Abstract: A carrier includes a first carrier portion and a second carrier portion. The first carrier portion includes a gear housing space that houses a planetary gear, an opening that opens the gear housing space toward the second carrier portion and allows the planetary gear to fit into the gear housing space, and a first support hole that supports a first end portion of the planetary support shaft. The second carrier portion includes a cover portion that covers the opening, a second support hole that supports a second end portion of the planetary support shaft, and a joining portion that detachably joins the second carrier portion to the first carrier portion. The joining portion is joined to the first carrier portion by being tightened in a direction aligned with a direction of an axial core of a sun gear.Type: ApplicationFiled: June 7, 2021Publication date: December 30, 2021Applicant: KUBOTA CORPORATIONInventors: Tomonari TSUCHIDA, Ryoma IWASE, Tomoyuki TANAKA, Takahiro MATSUO
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Publication number: 20210364074Abstract: 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: ApplicationFiled: December 6, 2019Publication date: November 25, 2021Applicant: KUBOTA CORPORATIONInventors: Yuji HIRASE, Ryoma IWASE, Tsuyoshi GONO, Takuya NISHIKUBO, Susumu TAKEOKA, Tsubasa KAWAZOE, Atsushi JINNAI