Komatsu Corporation

Hiroaki Takeshima

Yoshito Komatsu

Takeshi Yoshikawa

Naoya Akiyama

Atsushi Sasada

Kazushi Nakata

Masaaki Kuma

Takashi Kuse

Osamu Yatsuda

Osamu Takatori

Yoshitaka Kikuchi

Shinichi Otaka

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.

Crawler-type work machine

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.

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.

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.

A work vehicle monitoring system includes a work vehicle and a monitoring device provided on an exterior of the work vehicle. The work vehicle includes a steering clutch, a rotary member having a first hydraulic fluid supply channel, a drive unit, a support member having a second hydraulic fluid supply channel, a sealing ring disposed between the first hydraulic fluid supply channel and the second hydraulic fluid supply channel, a controller that controls a pressure of a hydraulic fluid inside the first hydraulic fluid supply channel and the second hydraulic fluid supply channel, and an external output component that outputs data related to the pressure, a rotational speed, and a time. The monitoring device accepts the data from the external output component and outputs maintenance information about the sealing ring when a predicted wear amount of the sealing ring obtained from the determination basis data exceeds a specific threshold.

Work vehicle and work vehicle monitoring system

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.

Work vehicle, monitoring system for work vehicle, and tracked work vehicle

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.

Bulldozer

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.

Work vehicle

A transmission includes an input shaft, an output shaft and an intermediate shaft, a power transmission mechanism and a control unit. The power transmission mechanism includes a forward travelling lower speed clutch, a forward travelling higher speed clutch, a rearward travelling clutch and a plurality of speed stage switching clutches. The control unit is configured to switch a gear state into a shiftable rearward travelling gear stage by turning off either the forward travelling lower speed clutch or the forward travelling higher speed clutch and by turning on the rearward travelling clutch in executing an operation of switching from forward travelling to rearward travelling, and to switch a gear stage into a shiftable forward travelling gear stage by turning off the rearward travelling clutch and turning on the forward travelling lower speed clutch in executing an operation of switching from rearward travelling to forward travelling.

Transmission for work vehicle

A work vehicle has a hydraulic pump and a transmission. The transmission includes a transmission body having a cylindrical input shaft, a torque converter body, a lock-up clutch device, a pump drive shaft, and an oil channel. The lock-up clutch device includes a piston, an oil chamber formed at a back surface of the piston, and a clutch portion. The pump drive shaft penetrates the input shaft and is disposed coaxially to the input shaft. The pump drive shaft transmits driving power to the hydraulic pump. The oil channel is formed between an inner circumference surface of the input shaft and an outer circumference surface of the pump drive shaft, and communicates with the oil chamber in the lock-up clutch device.

A backhoe loader includes a multi-axis transmission that includes: an input shaft to which power is inputted; a front output shaft coupled to a front wheel; a rear output shaft disposed in a position higher than that of the front output shaft and coupled to a rear wheel; an intermediate shaft disposed between the input shaft and the front output shaft; a first power transmission mechanism configured to transmit power from the input shaft to the intermediate shaft; and a second power transmission mechanism configured to transmit power from the intermediate shaft to the front output shaft and to transmit power from the front output shaft to the rear output shaft.

Backhoe loader

A multi-shaft transmission is mounted on a work vehicle for performing loader work, and includes a power transmission mechanism for transmitting power from an input shaft through a countershaft to an output shaft. A shifting part shifts a drivetrain from the input shaft to the output shaft. The power transmission mechanism includes a forward clutch and a reverse clutch for forward-reverse shifting, and a plurality of speed stage shifting clutches for changing speed stages, wherein at least one of the forward clutch and the reverse clutch has a plurality of speed region shifting clutches. The shifting part shifts only one clutch among the plurality of speed stage shifting clutches and the plurality of speed region shifting clutches to change speeds when a plurality of speed stages are used in be loader work.

A backhoe loader includes: a transmission; a cab including an operator's seat allowed to be forwardly and backwardly oriented; a loader disposed forwards of the cab; a backhoe disposed rearwards of the cab; a hydraulic pump configured to supply an operating oil to a hydraulic clutch; a hydraulic circuit including a relief valve for setting an intra-circuit hydraulic pressure to be a first hydraulic pressure; a work mode determining unit configured to determine whether or not an operating mode is a backhoe work mode using the backhoe; and a relief valve controlling unit. The relief valve controlling unit is configured to control a relief pressure of the relief valve at a second hydraulic pressure lower than the first hydraulic pressure when the work mode determining unit determines that the operating mode is the backhoe work mode.

A transmission for an industrial vehicle has an input shaft, first and second transmission mechanisms, a clutch mechanism, a rotation direction switching gear train, a speed change gear train, and an output shaft. The first and second transmission mechanisms change the speed among a plurality of speeds of rotation from the input shaft. The clutch mechanism is disposed on the input side of the transmission mechanisms and includes forward and reverse clutches and first and second snap clutches for selecting which of the first and second transmission mechanisms will receive rotational input from the engine. The rotation direction switching gear train inputs rotations for forward and reverse travel to the forward and reverse clutches. The speed change gear train inputs to the first snap clutch and the second snap clutch the output from the forward clutch and the reverse clutch.

Transmission for industrial vehicle

A transmission for an industrial vehicle has an input shaft; first and second transmission mechanisms each having a plurality of speed-change steps; a second transmission mechanism; a clutch mechanism; a rotation direction switching mechanism; and an output shaft. The clutch mechanism is disposed on the input side of the first and second transmission mechanisms and is provided with a forward clutch and a reverse clutch for switching between forward and reverse travel, and is further provided with first and second snap clutches for selecting which of the first and second transmission mechanisms will receive rotational input from the engine. The rotation direction switching mechanism is a mechanism for switching the direction of rotation inputted to the first transmission mechanism or the second transmission mechanism to the direction of rotation for forward travel or the direction of rotation for reverse travel in accordance with the switching of forward and reverse travel.

Growing community of inventors

Komatsu, Japan

Hiroaki Takeshima