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公开(公告)号：US20240101192A1
公开(公告)日：2024-03-28
申请号：US18253842
申请日：2021-12-15
Applicant: KOMATSU LTD.
Inventor： Takeshi YOSHIKAWA , Hiroaki TAKESHIMA , Naoya AKIYAMA , Kazushi NAKATA , Osamu YATSUDA , Shinichi OTAKA , Yuji NAMEKI , Ryoichi NAGASAKA , Takaomi KOMURA
CPC classification number: B62D11/183 , E02F9/225
Abstract: In a crawler type work machine, when switching from a pivot turning mode to a straight travel mode or a slow turning mode, a controller is configured to maintain a rotation speed of the turning motor until after a first timing at which the inside steering clutch begins partial engagement.
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公开(公告)号：US20250012043A1
公开(公告)日：2025-01-09
申请号：US18710308
申请日：2022-12-27
Applicant: KOMATSU LTD.
Inventor： Takeshi YOSHIKAWA , Hiroaki TAKESHIMA , Naoya AKIYAMA , Shinichi OTAKA , Kazushi NAKATA , Osamu YATSUDA
Abstract: A crawler-type work machine includes left and right steering brakes configured to brake left and right output shafts, a turning motor configured to produce a rotation speed difference between the left and right output shafts, work implement cylinders configured to drive a work implement attached to a vehicle body, a hydraulic pressure supply unit configured to supply hydraulic fluid to the turning motor and the work implement cylinders, and a controller configured to control the hydraulic pressure supply unit. The controller is configured to execute a hydraulic fluid amount control in order to reduce the hydraulic fluid amount supplied from the hydraulic pressure supply unit to the turning motor when the work implement cylinders are driven while the turning motor is rotating.
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公开(公告)号：US20240001989A1
公开(公告)日：2024-01-04
申请号：US18253830
申请日：2021-12-03
Applicant: KOMATSU LTD.
Inventor： Takeshi YOSHIKAWA , Hiroaki TAKESHIMA , Naoya AKIYAMA , Toshikazu OKADA , Kazushi NAKATA , Osamu YATSUDA
CPC classification number: B62D11/18 , B62D11/08 , E02F9/2267
Abstract: A controller of a crawler type work machine controls left and right steering clutches, left and right steering brakes, and a turning motor to cause the crawler type work machine to turn in either a slow turning mode or a pivot turning mode. The controller executes a hydraulic fluid amount control to reduce a hydraulic fluid amount supplied from a hydraulic pressure supply unit to the turning motor and to increase the hydraulic fluid amount supplied from the hydraulic pressure supply unit from the hydraulic pressure supply unit to the work implement cylinder when the work implement cylinder is driven while the turning motor is being rotated.
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公开(公告)号：US20230192187A1
公开(公告)日：2023-06-22
申请号：US17918195
申请日：2021-06-15
Applicant: KOMATSU LTD.
Inventor： Takeshi YOSHIKAWA , Naoya AKIYAMA , Hiroaki TAKESHIMA , Akane HAYASHI , Yoshitaka KIKUCHI
Abstract: A bulldozer has a left planetary gear mechanism, a left steering clutch, and a first clutch gear. The left planetary gear mechanism is disposed between an input shaft and a left output shaft. The left steering clutch switches between transmitting and blocking a rotational force from the input shaft to the left output shaft by the left planetary gear mechanism. The first clutch gear is attached to the left steering clutch. The left steering clutch can is configured to be engaged or disengaged with a left sun gear. The first clutch gear is fixed in an unrotatable manner.
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Patent Agency Ranking
公开(公告)号：US20180010320A1
公开(公告)日：2018-01-11
申请号：US15545509
申请日：2016-02-26
Applicant: KOMATSU LTD.
Inventor： Takeshi YOSHIKAWA , Hiroaki TAKESHIMA , Yoshito KOMATSU
CPC classification number: E02F9/2087 , B62D11/003 , B62D11/08 , E02F3/7604 , E02F3/84 , E02F9/02 , E02F9/2253 , E02F9/267 , F16D48/02 , F16D48/066 , F16D2500/1026 , F16D2500/10412 , F16D2500/1112 , F16D2500/3024 , F16D2500/3067 , F16D2500/30806 , F16D2500/30816 , F16D2500/3108 , F16D2500/5118 , F16D2500/70406 , F16D2500/7041 , G07C5/006 , G07C5/0808
Abstract: A work vehicle includes a rotary member, a support member, a sealing ring, a pressure controller, and a vehicle speed determination component. The rotary member has a first hydraulic fluid supply channel to supply the hydraulic fluid to the steering clutch, and is rotated by power from the transmission when the steering clutch is engaged. The sealing ring is disposed between the rotary member and the support member and is mounted adjacent to the connected part between the first hydraulic fluid supply channel and the second hydraulic fluid supply channel. The pressure controller controls the engagement pressure to be a specific first pressure when the vehicle speed is determined not to be equal to or greater than a specific speed, and controls the engagement pressure to decrease from the first pressure when the vehicle speed is determined to be equal to or greater than a specific speed.
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公开(公告)号：US20240010273A1
公开(公告)日：2024-01-11
申请号：US18253617
申请日：2021-11-05
Applicant: KOMATSU LTD.
Inventor： Takeshi YOSHIKAWA , Hiroaki TAKESHIMA , Naoya AKIYAMA , Toshikazu OKADA , Kazushi NAKATA , Osamu YATSUDA
CPC classification number: B62D11/08 , B62D5/0478 , B62D5/046
Abstract: A bulldozer causes left and right steering clutches to engage and left and right steering brakes to release when an operating amount of a steering lever is greater than a first predetermined amount and less than a second predetermined amount, and drives a turning motor so that the rotation speed of an inside output shaft becomes lower than the rotation speed of an outside output shaft as the operating amount of the steering lever increases. A controller causes the engagement rate of an inside steering clutch to decrease and causes an inside steering brake to brake when the operating amount of the steering lever is equal to or greater than the second predetermined amount.
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公开(公告)号：US20240001988A1
公开(公告)日：2024-01-04
申请号：US18253633
申请日：2021-11-05
Applicant: KOMATSU LTD.
Inventor： Takeshi YOSHIKAWA , Hiroaki TAKESHIMA , Naoya AKIYAMA , Kazushi NAKATA , Osamu YATSUDA , Shinichi OTAKA , Yuji NAMEKI , Ryouichi NAGASAKA , Takaomi KOMURA
CPC classification number: B62D11/08 , B62D11/001 , B62D11/12 , E02F9/225
Abstract: A controller provided in a bulldozer maintains the engagement of an inside steering clutch over a predetermined period beginning from a switching start point at which switching starts, when switching from a slow turn mode to a pivot turn mode, and when switching from the pivot turn mode to the slow turn mode, maintains the braking of an inside steering brake over a predetermined period beginning from a switching start point at which the switching starts.
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公开(公告)号：US20230136679A1
公开(公告)日：2023-05-04
申请号：US17918167
申请日：2021-06-15
Applicant: KOMATSU LTD.
Inventor： Naoya AKIYAMA , Takeshi YOSHIKAWA , Hiroaki TAKESHIMA
Abstract: The bulldozer has a right first oil channel, a right second oil channel, and a right third oil channel. The right first oil channel guides a portion of the lubricating oil discharged by a hydraulic pump to a right steering brake. The right second first oil channel guides a portion of the lubricating oil discharged by the hydraulic pump to a right planetary gear mechanism. The right third oil channel guides at least a portion of the lubricating oil that has passed through the right planetary gear mechanism to a right steering brake. At least a portion of the planetary gear mechanism is disposed further inside than the right steering brake in a radial direction perpendicular to the center axis of an input shaft.
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公开(公告)号：US20220242483A1
公开(公告)日：2022-08-04
申请号：US17622098
申请日：2020-06-29
Applicant: KOMATSU LTD.
Inventor： Yoshitaka KIKUCHI , Hiroaki TAKESHIMA , Takeshi YOSHIKAWA
Abstract: A bulldozer includes a control unit for controlling left and right steering clutches and left and right steering brakes, thereby executing a turning control of the vehicle. The control unit switches between a clutch control and a brake control on the basis of a differential between an actual turning radius and a target turning radius.
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