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

IPC: B62D11/18 ,  E02F9/22

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.

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

IPC: B62D11/08 ,  B62D11/10 ,  F16H1/28 ,  B60K17/16 ,  E02F3/76

CPC classification number: B62D11/08 ,  B62D11/10 ,  F16H1/28 ,  B60K17/16 ,  E02F3/76

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.

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

IPC: E02F9/20 ,  G07C5/00 ,  B62D11/08 ,  E02F9/02 ,  E02F9/26 ,  G07C5/08 ,  F16D48/02 ,  E02F3/76

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.

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

IPC: E02F3/84 ,  E02F9/02 ,  E02F9/20 ,  E02F9/22 ,  F15B13/06 ,  F15B15/18 ,  E02F3/76

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.

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

IPC: B62D11/18 ,  B62D11/08 ,  E02F9/22

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.

公开(公告)号：US20180230676A1

公开(公告)日：2018-08-16

申请号：US15751177

申请日：2016-10-04

Applicant: KOMATSU LTD.

Inventor： Naoya AKIYAMA ,  Hiroaki TAKESHIMA

IPC: E02F9/22 ,  B62D11/08 ,  F16D25/0638 ,  F16D55/40

CPC classification number: E02F9/225 ,  B60T11/21 ,  B62D11/08 ,  E02F3/80 ,  E02F9/2087 ,  F16D25/0638 ,  F16D55/40

Abstract: A bulldozer includes a steering clutch, a steering brake, a hydraulic pump that discharges a lubricating oil, a first lubricating oil supply path, a second lubricating oil supply path, a third lubricating oil supply path, and a flow amount switching valve disposed on the second lubricating oil supply path. The first lubricating oil supply path supplies a portion of the lubricating oil discharged by the hydraulic pump to the steering clutch The second lubricating oil supply path supplies a portion of the lubricating oil discharged by the hydraulic pump to the steering brake. The third lubricating oil supply path supplies, to the steering brake, a portion of the lubricating oil that has passed through the steering clutch. The flow amount switching valve switches an amount of the lubricating oil supplied to the steering brake.

公开(公告)号：US20180118261A1

公开(公告)日：2018-05-03

申请号：US15511069

申请日：2016-11-02

Applicant: KOMATSU LTD.

Inventor： Atsushi SASADA ,  Hiroaki TAKESHIMA ,  Osamu TAKATORI

IPC: B62D11/08 ,  B60T17/22 ,  B60W10/06 ,  B60W10/196 ,  B60W50/02

CPC classification number: B62D11/08 ,  B60T8/00 ,  B60T17/22 ,  B60W10/06 ,  B60W10/196 ,  B60W50/0205 ,  B60W2050/021 ,  B60W2300/17 ,  B60W2710/0644 ,  E02F3/76 ,  E02F9/2066 ,  E02F9/2083 ,  E02F9/226 ,  E02F9/26 ,  E02F9/268

Abstract: A bulldozer is provided with left and right steering brakes that brake the rotations of left and right drive wheels, and a control unit for hydraulically controlling the braking state of the respective left and right steering brakes. The control unit executes protection processing on the left steering brake or the right steering brake when a state of the degree of engagement of the left steering brake or the right steering brake being within a predetermined range and the vehicle speed being equal to or greater than a predetermined vehicle speed continues for a predetermined time.

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

IPC: B62D11/08 ,  B62D5/04

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.

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

IPC: B62D11/08 ,  B62D11/00 ,  B62D11/12

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.

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

IPC: B62D11/08 ,  F16H57/04 ,  E02F9/20 ,  E02F9/02

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.