Patents by Inventor Toshimitsu Yazaki
Toshimitsu Yazaki 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: 10626895Abstract: A working machine includes a vehicle body, a travel apparatus provided to a rear portion of the vehicle body, a fender provided above the travel apparatus, and hydraulic piping that is disposed between the travel apparatus and the fender and that extends from a front-portion side to a rear-portion side of the fender.Type: GrantFiled: September 28, 2017Date of Patent: April 21, 2020Assignee: Kubota CorporationInventors: Kenichiro Tsuji, Shigeo Sakamoto, Toshimitsu Yazaki, Toshiya Tsuji
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Publication number: 20180094656Abstract: A working machine includes a vehicle body, a travel apparatus provided to a rear portion of the vehicle body, a fender provided above the travel apparatus, and hydraulic piping that is disposed between the travel apparatus and the fender and that extends from a front-portion side to a rear-portion side of the fender.Type: ApplicationFiled: September 28, 2017Publication date: April 5, 2018Applicant: Kubota CorporationInventors: Kenichiro Tsuji, Shigeo Sakamoto, Toshimitsu Yazaki, Toshiya Tsuji
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Patent number: 9821618Abstract: A suspension system for a traveling vehicle body is disclosed. The system includes a suspension reference position varying mechanism (18) for varying a reference position of a suspension stroke of the suspension mechanism (100), and a controller (35) configured to calculate an intermediate value from a maximal value corresponding to the maximal position of the suspension stroke and a minimal value corresponding to the minimal position of the suspension stroke, and to control the suspension reference position varying mechanism such that, when the calculated intermediate values deviates from a set target range, the intermediate value is displaced toward the target range. The controller (35) increases a control execution frequency for the suspension reference position varying mechanism (18) when the traveling speed of the vehicle body is low, and reduces the control execution frequency for the suspension reference position varying mechanism (18) when the traveling speed of the vehicle body is high.Type: GrantFiled: April 13, 2015Date of Patent: November 21, 2017Assignee: Kubota CorporationInventors: Kenichi Iwami, Shigeki Hayashi, Akihiro Matsuzaki, Toshimitsu Yazaki, Atsushi Hayashi, Kazuma Ishihara
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Patent number: 9421841Abstract: The hydraulic suspension system comprises a suspension mechanism for a traveling vehicle body, a suspension reference position variation mechanism for varying a reference position of a suspension stroke of the suspension mechanism, and a stopped state detector for detecting a state in which operation of the suspension mechanism has stopped. The control management unit controls the suspension reference position variation mechanism so that when operation of the suspension mechanism is detected by the stopped state detector to be in a stopped state, the operation of the suspension mechanism moves toward a target range, in preference to control based on a suspension stroke position obtained from a suspension stroke position sensor.Type: GrantFiled: May 6, 2015Date of Patent: August 23, 2016Assignee: Kubota CorporationInventors: Kenichi Iwami, Shigeki Hayashi, Atsushi Hayashi, Akihiro Matsuzaki, Toshimitsu Yazaki, Nobuyuki Okabe
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Publication number: 20150246589Abstract: A suspension system for a traveling vehicle body is disclosed. The system includes a suspension reference position varying mechanism (18) for varying a reference position of a suspension stroke of the suspension mechanism (100), and a controller (35) configured to calculate an intermediate value from a maximal value corresponding to the maximal position of the suspension stroke and a minimal value corresponding to the minimal position of the suspension stroke, and to control the suspension reference position varying mechanism such that, when the calculated intermediate values deviates from a set target range, the intermediate value is displaced toward the target range. The controller (35) increases a control execution frequency for the suspension reference position varying mechanism (18) when the traveling speed of the vehicle body is low, and reduces the control execution frequency for the suspension reference position varying mechanism (18) when the traveling speed of the vehicle body is high.Type: ApplicationFiled: April 13, 2015Publication date: September 3, 2015Inventors: Kenichi Iwami, Shigeki Hayashi, Akihiro Matsuzaki, Toshimitsu Yazaki, Atsushi Hayashi, Kazuma Ishihara
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Publication number: 20150231943Abstract: The hydraulic suspension system comprises a suspension mechanism for a traveling vehicle body, a suspension reference position variation mechanism for varying a reference position of a suspension stroke of the suspension mechanism, and a stopped state detector for detecting a state in which operation of the suspension mechanism has stopped. The control management unit controls the suspension reference position variation mechanism so that when operation of the suspension mechanism is detected by the stopped state detector to be in a stopped state, the operation of the suspension mechanism moves toward a target range, in preference to control based on a suspension stroke position obtained from a suspension stroke position sensor.Type: ApplicationFiled: May 6, 2015Publication date: August 20, 2015Inventors: Kenichi Iwami, Shigeki Hayashi, Atsushi Hayashi, Akihiro Matsuzaki, Toshimitsu Yazaki, Nobuyuki Okabe
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Patent number: 9045016Abstract: The hydraulic suspension system comprises a suspension mechanism (100) for a traveling vehicle body, a suspension reference position variation mechanism (18) for varying a reference position of a suspension stroke of the suspension mechanism, and a stopped state detector (58) for detecting a state in which operation of the suspension mechanism (100) has stopped. The control management unit (60) controls the suspension reference position variation mechanism (18) so that when operation of the suspension mechanism (100) is detected by the stopped state detector (58) to be in a stopped state, the operation of the suspension mechanism (100) moves toward a target range, in preference to control based on a suspension stroke position obtained from a suspension stroke position sensor (37).Type: GrantFiled: November 28, 2012Date of Patent: June 2, 2015Assignee: Kubota CorporationInventors: Kenichi Iwami, Shigeki Hayashi, Atsushi Hayashi, Akihiro Matsuzaki, Toshimitsu Yazaki, Nobuyuki Okabe
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Patent number: 9020698Abstract: A suspension system for a traveling vehicle body is disclosed. The system includes a suspension reference position varying mechanism (18) for varying a reference position of a suspension stroke of the suspension mechanism (100), and a controller (35) configured to calculate an intermediate value from a maximal value corresponding to the maximal position of the suspension stroke and a minimal value corresponding to the minimal position of the suspension stroke, and to control the suspension reference position varying mechanism such that, when the calculated intermediate values deviates from a set target range, the intermediate value is displaced toward the target range. The controller (35) increases a control execution frequency for the suspension reference position varying mechanism (18) when the traveling speed of the vehicle body is low, and reduces the control execution frequency for the suspension reference position varying mechanism (18) when the traveling speed of the vehicle body is high.Type: GrantFiled: March 25, 2009Date of Patent: April 28, 2015Assignee: Kubota CorporationInventors: Kenichi Iwami, Shigeki Hayashi, Akihiro Matsuzaki, Toshimitsu Yazaki, Atsushi Hayashi, Kazuma Ishihara
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Patent number: 8762001Abstract: A tractor is provided for suppressing pitching in which a front part of a traveling vehicle body is lifted upward, while a suspension mechanism functions when work is carried out with a ground implement. When a raise control signal for raising the plow is detected in draft control for elevating/lowering the plow based on a draw load value detected by a draw load sensor, mode switching means suppresses or limits the suspension function, via control of the suspension control means to suppress an event in which the front part of the traveling vehicle body is lifted upward. When the raise control signal is not detected, the mode switching means causes the suspension mechanism to function via control of the suspension control means.Type: GrantFiled: March 14, 2012Date of Patent: June 24, 2014Assignee: Kubota CorporationInventors: Akihiro Matsuzaki, Kenichi Iwami, Toshimitsu Yazaki, Atsushi Hayashi, Shinnosuke Ishikawa
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Patent number: 8406955Abstract: The hydraulic suspension system comprises a suspension mechanism (100) for a traveling vehicle body, a suspension reference position variation mechanism (18) for varying a reference position of a suspension stroke of the suspension mechanism, and a stopped state detector (58) for detecting a state in which operation of the suspension mechanism (100) has stopped. The control management unit (60) controls the suspension reference position variation mechanism (18) so that when operation of the suspension mechanism (100) is detected by the stopped state detector (58) to be in a stopped state, the operation of the suspension mechanism (100) moves toward a target range, in preference to control based on a suspension stroke position obtained from a suspension stroke position sensor (37).Type: GrantFiled: September 17, 2009Date of Patent: March 26, 2013Assignee: Kubota CorporationInventors: Kenichi Iwami, Shigeki Hayashi, Atsushi Hayashi, Akihiro Matsuzaki, Toshimitsu Yazaki, Nobuyuki Okabe
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Publication number: 20120245795Abstract: A tractor is improved for suppressing pitching in which a front part of a traveling vehicle body is lifted upward, while a suspension mechanism effectively functions when work is carried out with a ground implement. When a raise control signal for raising the plow is detected in draft control for elevating/lowering the plow based on a draw load value detected by a draw load sensor, mode switching means suppresses or limits the suspension function, via control of the suspension control means to suppress an adverse event in which the front part of the traveling vehicle body is lifted upward. When the raise control signal is not detected, the mode switching means causes the suspension mechanism to effectively function via control of the suspension control means.Type: ApplicationFiled: March 14, 2012Publication date: September 27, 2012Applicant: KUBOTA CORPORATIONInventors: Akihiro Matsuzaki, Kenichi Iwami, Toshimitsu Yazaki, Atsushi Hayashi, Shinnosuke Ishikawa
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Patent number: 7938221Abstract: A suspension system for a vehicle includes a swing frame and right and left suspension cylinders for front wheels. The swing frame is swingably supported by the front portion of a vehicle body about a support shaft extending in a lateral direction, and supports the front axle case, so as to allow the front axle case to swing about a center shaft extending in a front-rear direction. The right and left suspension cylinders are provided on the swing frame. A lateral oscillation regulation unit is provided between the swing frame and the front frame, and configured to regulate an oscillation of the swing frame by contact in the lateral direction.Type: GrantFiled: March 16, 2010Date of Patent: May 10, 2011Assignee: Kubota CorporationInventors: Akihiro Matsuzaki, Atsushi Hayashi, Nobuyuki Okabe, Toshimitsu Yazaki
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Publication number: 20110098885Abstract: A suspension system for a traveling vehicle body is disclosed. The system includes a suspension reference position varying mechanism (18) for varying a reference position of a suspension stroke of the suspension mechanism (100), and a controller (35) configured to calculate an intermediate value from a maximal value corresponding to the maximal position of the suspension stroke and a minimal value corresponding to the minimal position of the suspension stroke, and to control the suspension reference position varying mechanism such that, when the calculated intermediate values deviates from a set target range, the intermediate value is displaced toward the target range. The controller (35) increases a control execution frequency for the suspension reference position varying mechanism (18) when the traveling speed of the vehicle body is low, and reduces the control execution frequency for the suspension reference position varying mechanism (18) when the traveling speed of the vehicle body is high.Type: ApplicationFiled: March 25, 2009Publication date: April 28, 2011Applicant: KUBOTA CORPORATIONInventors: Kenichi Iwami, Shigeki Hayashi, Akihiro Matsuzaki, Toshimitsu Yazaki, Atsushi Hayashi, Kazuma Ishihara
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Patent number: 7918470Abstract: A hydraulic suspension system includes a suspension base (16) supporting wheels, a hydraulic cylinder (19) for displaceably suspending the suspension base from a vehicle body, and an oil passage connected to the hydraulic cylinder. An accumulator (21, 23) is incorporated within the oil passage. A flow control valve (51) is incorporated at an oil passage portion between the hydraulic cylinder and said accumulator for controlling an amount of work oil flowing therebetween. A pressure sensor (56) is provided for detecting a cylinder oil passage pressure effective on the hydraulic cylinder. A control unit (57) is provided for controlling operation of the flow control valve, based upon a detection value from the pressure sensor.Type: GrantFiled: February 18, 2009Date of Patent: April 5, 2011Assignee: Kubota CorporationInventors: Akihiro Matsuzaki, Atsushi Hayashi, Toshimitsu Yazaki, Kenichi Iwami
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Publication number: 20100244394Abstract: A suspension system for a vehicle includes a swing frame and right and left suspension cylinders for front wheels. The swing frame is swingably supported by the front portion of a vehicle body about a support shaft extending in a lateral direction, and supports the front axle case, so as to allow the front axle case to swing about a center shaft extending in a front-rear direction. The right and left suspension cylinders are provided on the swing frame. A lateral oscillation regulation unit is provided between the swing frame and the front frame, and configured to regulate an oscillation of the swing frame by contact in the lateral direction.Type: ApplicationFiled: March 16, 2010Publication date: September 30, 2010Applicant: KUBOTA CORPORATIONInventors: Akihiro Matsuzaki, Atsushi Hayashi, Nobuyuki Okabe, Toshimitsu Yazaki
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Publication number: 20100168959Abstract: The hydraulic suspension system comprises a suspension mechanism (100) for a traveling vehicle body, a suspension reference position variation mechanism (18) for varying a reference position of a suspension stroke of the suspension mechanism, and a stopped state detector (58) for detecting a state in which operation of the suspension mechanism (100) has stopped. The control management unit (60) controls the suspension reference position variation mechanism (18) so that when operation of the suspension mechanism (100) is detected by the stopped state detector (58) to be in a stopped state, the operation of the suspension mechanism (100) moves toward a target range, in preference to control based on a suspension stroke position obtained from a suspension stroke position sensor (37).Type: ApplicationFiled: September 17, 2009Publication date: July 1, 2010Applicant: KUBOTA CORPORATIONInventors: Kenichi Iwami, Shigeki Hayashi, Atsushi Hayashi, Akihiro Matsuzaki, Toshimitsu Yazaki, Nobuyuki Okabe
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Publication number: 20090212473Abstract: A hydraulic suspension system includes a suspension base (16) supporting wheels, a hydraulic cylinder (19) for displaceably suspending the suspension base from a vehicle body, and an oil passage connected to the hydraulic cylinder. An accumulator (21, 23) is incorporated within the oil passage. A flow control valve (51) is incorporated at an oil passage portion between the hydraulic cylinder and said accumulator for controlling an amount of work oil flowing therebetween. A pressure sensor (56) is provided for detecting a cylinder oil passage pressure effective on the hydraulic cylinder. A control unit (57) is provided for controlling operation of the flow control valve, based upon a detection value from the pressure sensor.Type: ApplicationFiled: February 18, 2009Publication date: August 27, 2009Applicant: KUBOTA CORPORATIONInventors: Akihiro Matsuzaki, Atsushi Hayashi, Toshimitsu Yazaki, Kenichi Iwami
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Patent number: 7434488Abstract: A transmission for a tractor comprises a transmission case having an opening that opens to exterior of the transmission case and a speed change device that is housed in the transmission case. The transmission also includes a cover removably attached to the transmission case for closing the opening of the transmission, a main speed change shift fork supported by the cover and capable of engaging with and moving a main speed change shifter, and a sub speed change shift fork supported by the cover and capable of engaging with and moving a sub speed change shifter. The cover is capable of mounting a creep speed change device having a creep speed position.Type: GrantFiled: February 9, 2006Date of Patent: October 14, 2008Assignee: Kubota CorporationInventors: Kenichiro Tsuji, Toshimitsu Yazaki, Toshinobu Owada
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Patent number: 7290829Abstract: A working vehicle with a cab is disclosed. The working vehicle comprises a vehicle body for supporting said cab; ground-engaging means for supporting said vehicle body; and a cab frame provided to said cab, said cab frame including right and left front posts, right and left rear posts, and right and left upper frames extending fore and aft between upper end regions of said front posts and upper end regions of said rear posts, respectively; wherein at least part of said cab is curved to bulge outward.Type: GrantFiled: June 24, 2005Date of Patent: November 6, 2007Assignee: Kubota CorporationInventors: Tomeo Umemoto, Koichi Hasegawa, Hideo Fujita, Koichiro Kan, Toshinobu Owada, Tetsuya Yamamoto, Toshimitsu Yazaki
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Publication number: 20060243076Abstract: A transmission for a tractor comprises a transmission case having an opening that opens to exterior of the transmission case and a speed change device that is housed in the transmission case. The transmission also includes a cover removably attached to the transmission case for closing the opening of the transmission, a main speed change shift fork supported by the cover and capable of engaging with and moving a main speed change shifter, and a sub speed change shift fork supported by the cover and capable of engaging with and moving a sub speed change shifter. The cover is capable of mounting a creep speed change device having a creep speed position.Type: ApplicationFiled: February 9, 2006Publication date: November 2, 2006Applicant: Kubota CorporationInventors: Kenichiro Tsuji, Toshimitsu Yazaki, Toshinobu Owada