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：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：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.