Patents by Inventor Ryohei Sumiyoshi
Ryohei Sumiyoshi 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: 11644098Abstract: A hydraulic system of a work machine includes a first hydraulic device to operate in a first operation mode while pressure of hydraulic oil supplied from a hydraulic pump via a first oil passage is equal to or higher than a first pressure threshold. The hydraulic oil in the first oil passage is to be discharged via a second oil passage. A pilot check valve is provided in the second oil passage and has a pilot port to receive a pilot pressure of the hydraulic oil. The pilot check valve is closed to stop discharging the hydraulic oil in the first oil passage through the second oil passage while the pilot pressure is lower than the fourth pressure threshold. The pilot check valve is opened while the pilot pressure is higher than or equal to the fourth pressure threshold. The first hydraulic device is a ride control device.Type: GrantFiled: December 17, 2020Date of Patent: May 9, 2023Assignee: KUBOTA CORPORATIONInventors: Yuji Fukuda, Kazuyoshi Arii, Ryohei Sumiyoshi
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Publication number: 20220410699Abstract: A tank includes a tank body made of a thermoplastic resin, a female screw member and a joint that are made of metal, and a seal member. The tank body has a tubular connection port with a through hole, and an inner space communicating with the connection port. The joint has a male screw portion to be screwed into a female screw hole of the female screw member, a boss portion connected to the male screw portion, and a joint through hole passing through the male screw portion and the boss portion. The seal member is provided so as to contact the boss portion and the hole side surface when the male screw portion is screwed into the female screw hole. The boss portion is contactable with a first bearing surface of the female screw member.Type: ApplicationFiled: May 24, 2022Publication date: December 29, 2022Applicant: Kubota CorporationInventors: Masaki INAOKA, Ryohei SUMIYOSHI, Shogo KAJII
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Publication number: 20210102626Abstract: A hydraulic system of a work machine includes a first hydraulic device to operate in a first operation mode while pressure of hydraulic oil supplied from a hydraulic pump via a first oil passage is equal to or higher than a first pressure threshold. The hydraulic oil in the first oil passage is to be discharged via a second oil passage. A pilot check valve is provided in the second oil passage and has a pilot port to receive a pilot pressure of the hydraulic oil. The pilot check valve is closed to stop discharging the hydraulic oil in the first oil passage through the second oil passage while the pilot pressure is lower than the fourth pressure threshold. The pilot check valve is opened while the pilot pressure is higher than or equal to the fourth pressure threshold. The first hydraulic device is a ride control device.Type: ApplicationFiled: December 17, 2020Publication date: April 8, 2021Applicant: Kubota CorporationInventors: Yuji FUKUDA, Kazuyoshi ARII, Ryohei SUMIYOSHI
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Patent number: 10900562Abstract: A hydraulic system of a work machine includes a first hydraulic device to operate in a first operation mode while pressure of hydraulic oil supplied from a hydraulic pump via a first oil passage is equal to or higher than a first pressure threshold. The hydraulic oil in the first oil passage is to be discharged via a second oil passage. A pilot check valve is provided in the second oil passage and has a pilot port to receive a pilot pressure of the hydraulic oil. The pilot check valve is closed to stop discharging the hydraulic oil in the first oil passage through the second oil passage while the pilot pressure is lower than the fourth pressure threshold. The pilot check valve is opened while the pilot pressure is higher than or equal to the second pressure threshold. The first hydraulic device is an operation control valve.Type: GrantFiled: March 30, 2020Date of Patent: January 26, 2021Assignee: KUBOTA CORPORATIONInventors: Yuji Fukuda, Kazuyoshi Arii, Ryohei Sumiyoshi
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Publication number: 20200224764Abstract: A hydraulic system of a work machine includes a first hydraulic device to operate in a first operation mode while pressure of hydraulic oil supplied from a hydraulic pump via a first oil passage is equal to or higher than a first pressure threshold. The hydraulic oil in the first oil passage is to be discharged via a second oil passage. A pilot check valve is provided in the second oil passage and has a pilot port to receive a pilot pressure of the hydraulic oil. The pilot check valve is closed to stop discharging the hydraulic oil in the first oil passage through the second oil passage while the pilot pressure is lower than the fourth pressure threshold. The pilot check valve is opened while the pilot pressure is higher than or equal to the second pressure threshold. The first hydraulic device is an operation control valve.Type: ApplicationFiled: March 30, 2020Publication date: July 16, 2020Applicant: Kubota CorporationInventors: Yuji FUKUDA, Kazuyoshi ARII, Ryohei SUMIYOSHI
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Patent number: 10641388Abstract: A hydraulic system of a work machine includes a first hydraulic device to operate in a first operation mode while pressure of hydraulic oil supplied from a hydraulic pump via a first oil passage is equal to or higher than a first pressure threshold. The hydraulic oil in the first oil passage is to be discharged via a second oil passage. A pilot check valve is provided in the second oil passage and has a pilot port to receive a pilot pressure of the hydraulic oil. The pilot check valve is closed to stop discharging the hydraulic oil in the first oil passage through the second oil passage while the pilot pressure is higher than or equal to the second pressure threshold. The pilot check valve is opened while the pilot pressure is less than the second pressure threshold.Type: GrantFiled: December 6, 2016Date of Patent: May 5, 2020Assignee: KUBOTA CORPORATIONInventors: Yuji Fukuda, Kazuyoshi Arii, Ryohei Sumiyoshi
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Patent number: 10451094Abstract: A hydraulic system of a work machine includes a first oil path which is connected to a hydraulic pump and though which hydraulic oil is to flow from the hydraulic pump. An operation valve is connected to the first oil path. An operation lever is to control the operation valve to control pressure of the hydraulic oil in accordance with an operation of the operation member. A hydraulic instrument is to be actuated by the hydraulic oil output from the operation valve. A second oil path connects the operation valve and the hydraulic instrument. The hydraulic oil in the second oil path is discharged through a discharge oil path. An actuation valve is provided in the discharge oil path. An actuation valve controller is to control the actuation valve to be opened and closed according to a temperature of hydraulic oil detected by a first sensor.Type: GrantFiled: September 28, 2016Date of Patent: October 22, 2019Assignee: KUBOTA CORPORATIONInventors: Yuji Fukuda, Kazuyoshi Arii, Ryohei Sumiyoshi
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Patent number: 10352335Abstract: A hydraulic system of a work machine includes a first hydraulic actuator, a first control valve, a first oil passage, a second hydraulic actuator, a second control valve, a second oil passage, and a bypass oil passage. The first control valve is connected to the first hydraulic actuator to control the first hydraulic actuator. The first oil passage is connected to the first control valve to supply hydraulic oil to the first control valve. The second control valve connected to the second hydraulic actuator to control the second hydraulic actuator. The second oil passage connects the second control valve and the first hydraulic actuator via the first control valve. Hydraulic oil returning from the first hydraulic actuator to the first control valve is to be supplied to the second control valve through the second oil passage. The bypass oil passage connects the first oil passage and the second oil passage.Type: GrantFiled: December 21, 2016Date of Patent: July 16, 2019Assignee: KUBOTA CORPORATIONInventors: Yuji Fukuda, Kazuyoshi Arii, Ryohei Sumiyoshi, Keigo Honda
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Publication number: 20190195207Abstract: A hydraulic system for a work machine includes an operation member, a prime mover, a hydraulic pump driven by the prime mover, the hydraulic pump configured to output an operation fluid, a first temperature sensor to measure a temperature of the operation fluid, a first fluid tube connected to the hydraulic pump, an operation valve connected to the first fluid tube, the operation valve configured to control, in accordance with an operation extent of the operation member, a pressure of the outputted operation fluid, a hydraulic apparatus driven by the operation fluid outputted from the operation valve, a second hydraulic tube connecting the operation valve to the hydraulic apparatus, a discharge fluid tube to discharge the operation fluid included in the second fluid tube; and an actuation valve disposed on the discharge fluid tube, the actuation valve configured to control an aperture of the actuation valve based on the temperature.Type: ApplicationFiled: February 28, 2019Publication date: June 27, 2019Applicant: KUBOTA CORPORATIONInventors: Yuji FUKUDA, Kazuyoshi ARII, Ryohei SUMIYOSHI
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Patent number: 10316496Abstract: A hydraulic system for a work machine includes a hydraulic pump to supply a pilot fluid, and a hydraulic switch valve to be switched to a plurality of switching positions based on a pilot pressure. The pilot pressure is a pressure of the pilot fluid supplied from the hydraulic pump. The hydraulic system includes a direction switch valve to apply a first pilot pressure to the hydraulic switch valve to switch the hydraulic switch valve into one of the plurality of switching positions. The hydraulic system includes a pressure applying device to apply a second pilot pressure to the hydraulic switch valve. The second pilot pressure is lower than the first pilot pressure.Type: GrantFiled: December 26, 2016Date of Patent: June 11, 2019Assignee: KUBOTA CORPORATIONInventors: Yuji Fukuda, Kazuyoshi Arii, Keisuke Miura, Ryosuke Kinugawa, Ikuhiro Uotani, Satoshi Tajima, Ryohei Sumiyoshi, Kunihiro Suzuki
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Patent number: 10280906Abstract: A hydraulic system for a work machine includes an operation member, a prime mover, a hydraulic pump driven by the prime mover, the hydraulic pump configured to output an operation fluid, a first temperature sensor to measure a temperature of the operation fluid, a first fluid tube connected to the hydraulic pump, an operation valve connected to the first fluid tube, the operation valve configured to control, in accordance with an operation extent of the operation member, a pressure of the outputted operation fluid, a hydraulic apparatus driven by the operation fluid outputted from the operation valve, a second hydraulic tube connecting the operation valve to the hydraulic apparatus, a discharge fluid tube to discharge the operation fluid included in the second fluid tube; and an actuation valve disposed on the discharge fluid tube, the actuation valve configured to control an aperture of the actuation valve based on the temperature.Type: GrantFiled: June 6, 2017Date of Patent: May 7, 2019Assignee: KUBOTA CORPORATIONInventors: Yuji Fukuda, Kazuyoshi Arii, Ryohei Sumiyoshi
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Patent number: 10260213Abstract: A working machine includes a travel device, a motive power transmission device configured to transmit a motive power to the travel device, a transmission case configured to house the motive power transmission device, and a hydraulic operation fluid tank disposed on an upper surface of the transmission case.Type: GrantFiled: October 26, 2017Date of Patent: April 16, 2019Assignee: KUBOTA CORPORATIONInventors: Ryohei Sumiyoshi, Hideo Imai, Noriyoshi Kubo, Hiroyuki Anami, Hiroyuki Hata, Toyoaki Yasuda, Masahiro Kuroda, Kohei Higashiyama, Yuji Yamashita, Satoshi Tajima, Shunichiro Mori, Hayato Ido, Toshihiko Takemura, Shinsuke Hisatake, Hajime Tamaki, Hiroshi Koyamatsu
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Patent number: 10150366Abstract: A work machine includes a machine body, a motor provided in a rear portion of the machine body, a bonnet which covers a rear of the motor and which is openable, a tank disposed between the motor and the bonnet, and a support member. The support member includes a bracket supporting the tank on the bonnet such that the tank is separated from the bonnet.Type: GrantFiled: December 26, 2016Date of Patent: December 11, 2018Assignee: KUBOTA CORPORATIONInventors: Yuji Yamashita, Ryohei Sumiyoshi, Toyoaki Yasuda, Toshihiko Takemura, Kunihiro Suzuki
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Patent number: 9988790Abstract: A working machine includes a machine body including a motor room, a motor mounted on the machine body and housed in the motor room, a fan arranged above the motor, the fan being to generate an air flow downward, a radiator arranged above the fan, an oil cooler arranged above the fan, and a shroud disposed around the fan. The shroud includes an opening rim portion forming an air inlet to take air from the motor room.Type: GrantFiled: July 17, 2017Date of Patent: June 5, 2018Assignee: KUBOTA CORPORATIONInventors: Yuji Yamashita, Ryohei Sumiyoshi, Satoshi Tajima, Kunihiro Suzuki, Hayato Kawano, Hiroyuki Anami, Hajime Tamaki
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Publication number: 20180044885Abstract: A working machine includes a travel device, a motive power transmission device configured to transmit a motive power to the travel device, a transmission case configured to house the motive power transmission device, and a hydraulic operation fluid tank disposed on an upper surface of the transmission case.Type: ApplicationFiled: October 26, 2017Publication date: February 15, 2018Applicant: KUBOTA CORPORATIONInventors: Ryohei SUMIYOSHI, Hideo IMAI, Noriyoshi KUBO, Hiroyuki ANAMI, Hiroyuki HATA, Toyoaki YASUDA, Masahiro KURODA, Kohei HIGASHIYAMA, Yuji YAMASHITA, Satoshi TAJIMA, Shunichiro MORI, Hayato IDO, Toshihiko TAKEMURA, Shinsuke HISATAKE, Hajime TAMAKI, Hiroshi KOYAMATSU
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Publication number: 20170350095Abstract: A hydraulic system for a work machine includes an operation member, a prime mover, a hydraulic pump driven by the prime mover, the hydraulic pump configured to output an operation fluid, a first temperature sensor to measure a temperature of the operation fluid, a first fluid tube connected to the hydraulic pump, an operation valve connected to the first fluid tube, the operation valve configured to control, in accordance with an operation extent of the operation member, a pressure of the outputted operation fluid, a hydraulic apparatus driven by the operation fluid outputted from the operation valve, a second hydraulic tube connecting the operation valve to the hydraulic apparatus, a discharge fluid tube to discharge the operation fluid included in the second fluid tube; and an actuation valve disposed on the discharge fluid tube, the actuation valve configured to control an aperture of the actuation valve based on the temperature.Type: ApplicationFiled: June 6, 2017Publication date: December 7, 2017Applicant: KUBOTA CORPORATIONInventors: Yuji FUKUDA, Kazuyoshi ARII, Ryohei SUMIYOSHI
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Patent number: 9828744Abstract: A working machine includes a travel device, a motive power transmission device configured to transmit a motive power to the travel device, a transmission case configured to house the motive power transmission device, and a hydraulic operation fluid tank disposed on an upper surface of the transmission case.Type: GrantFiled: September 13, 2016Date of Patent: November 28, 2017Assignee: KUBOTA CORPORATIONInventors: Ryohei Sumiyoshi, Hideo Imai, Noriyoshi Kubo, Hiroyuki Anami, Hiroyuki Hata, Toyoaki Yasuda, Masahiro Kuroda, Kohei Higashiyama, Yuji Yamashita, Satoshi Tajima, Shunichiro Mori, Hayato Ido, Toshihiko Takemura, Shinsuke Hisatake, Hajime Tamaki, Hiroshi Koyamatsu
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Publication number: 20170314230Abstract: A working machine includes a machine body including a motor room, a motor mounted on the machine body and housed in the motor room, a fan arranged above the motor, the fan being to generate an air flow downward, a radiator arranged above the fan, an oil cooler arranged above the fan, and a shroud disposed around the fan. The shroud includes an opening rim portion forming an air inlet to take air from the motor room.Type: ApplicationFiled: July 17, 2017Publication date: November 2, 2017Applicant: KUBOTA CORPORATIONInventors: Yuji YAMASHITA, Ryohei SUMIYOSHI, Satoshi TAJIMA, Kunihiro SUZUKI, Hayato KAWANO, Hiroyuki ANAMI, Hajime TAMAKI
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Patent number: 9752302Abstract: A working machine includes: a motor; a fan arranged above the motor, the fan being configured to generate an air flow downward; a radiator arranged above the fan; and an oil cooler arranged adjacent to the radiator. In addition, the working machine includes: a shroud disposed around fan, the shroud including: a rim portion forming an air vent hole, the air vent hole being for passage of the air flow generated by the fan; and a support member attached to an upper portion of the shroud, the support member being configured to support the radiator and the oil cooler.Type: GrantFiled: September 23, 2015Date of Patent: September 5, 2017Assignee: KUBOTA CORPORATIONInventors: Yuji Yamashita, Ryohei Sumiyoshi, Satoshi Tajima, Kunihiro Suzuki, Hayato Kawano, Hiroyuki Anami, Hajime Tamaki
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Patent number: D1023074Type: GrantFiled: June 28, 2022Date of Patent: April 16, 2024Assignee: KUBOTA CORPORATIONInventors: Taiki Furuki, Ryo Masuda, Yuya Kusaka, Ryohei Sumiyoshi, Junichi Murakami, Takahiro Kubo