Abstract: A crawler work vehicle includes an engine, left and right travel devices, a power transmission device, left and right steering clutches, left and right steering brakes, a rotation speed detecting device, a brake hydraulic pressure obtaining device, and a brake protecting device. The rotation speed detecting device detects an output rotation speed of the steering brakes. The brake hydraulic pressure obtaining device obtains a brake hydraulic pressure supplied to the steering brakes. The brake protecting device refers to the output rotation speed and the brake hydraulic pressure to compute a heat rate of the steering brakes, and executes a protection process of the steering brakes by reducing the engine output upon determining the heat rate that was computed is equal to or greater than a preset first threshold.

Abstract: A crawler work vehicle includes an engine, left and right travel devices, a power transmission device, left and right steering clutches, left and right steering brakes, a rotation speed detecting device, a brake hydraulic pressure obtaining device, and a brake protecting device. The rotation speed detecting device detects an output rotation speed of the steering brakes. The brake hydraulic pressure obtaining device obtains a brake hydraulic pressure supplied to the steering brakes. The brake protecting device refers to the output rotation speed and the brake hydraulic pressure to compute a heat rate of the steering brakes, and executes a protection process of the steering brakes by reducing the engine output upon determining the heat rate that was computed is equal to or greater than a preset first threshold.

Abstract: An occurrence of steering clutch slippage is reliably determined in order to protect the steering clutch. A crawler work vehicle includes left and right steering clutches, left and right steering brakes, a rotation speed detecting difference device, a clutch hydraulic pressure obtaining device, and a clutch protecting device. The rotation speed difference detecting device detects a rotation speed difference between the input and output of each of the steering clutches. The clutch hydraulic pressure obtaining device obtains a clutch hydraulic pressure supplied to each steering clutch. The clutch protecting device refers to the rotation speed difference and the clutch hydraulic pressure, computes a steering clutch heat rate, and compares the computed heat rate with a preset first threshold to execute a steering clutch protection process.

Abstract: An occurrence of steering clutch slippage is reliably determined in order to protect the steering clutch. A crawler work vehicle includes left and right steering clutches, left and right steering brakes, a rotation speed detecting difference device, a clutch hydraulic pressure obtaining device, and a clutch protecting device. The rotation speed difference detecting device detects a rotation speed difference between the input and output of each of the steering clutches. The clutch hydraulic pressure obtaining device obtains a clutch hydraulic pressure supplied to each steering clutch. The clutch protecting device refers to the rotation speed difference and the clutch hydraulic pressure, computes a steering clutch heat rate, and compares the computed heat rate with a preset first threshold to execute a steering clutch protection process.

Abstract: A brake device lubrication device includes a lubricant supply unit and a control unit. The control unit includes a braking timer, a release timer and a storage unit. The control unit is configured to control the lubricant supply unit so as to supply a predetermined first supply amount of lubricant to a brake device when the brake device is in a braking state, to acquire a delay time corresponding to a braking time counted by the braking timer from a relationship of correspondence between the braking time and the delay time stored by the storage unit when the brake device is switched from the braking state to a released state, and to switch a supply amount of lubricant from the first supply amount to a second supply amount which is smaller than the first supply amount when the release time counted by the release timer reaches the acquired delay time.

Abstract: A brake device lubrication device includes a lubricant supply unit and a control unit. The control unit includes a braking timer, a release timer and a storage unit. The control unit is configured to control the lubricant supply unit so as to supply a predetermined first supply amount of lubricant to a brake device when the brake device is in a braking state, to acquire a delay time corresponding to a braking time counted by the braking timer from a relationship of correspondence between the braking time and the delay time stored by the storage unit when the brake device is switched from the braking state to a released state, and to switch a supply amount of lubricant from the first supply amount to a second supply amount which is smaller than the first supply amount when the release time counted by the release timer reaches the acquired delay time.

Abstract: A rotational speed controller for mixing equipment of a soil modifying machine, by which optional quality of modified soil can be obtained, is provided. To this end, the rotational speed controller includes a mixer (127, 147) rotating to mix soil to be modified, drive means (127b, 147b) for rotationally driving the mixer, speed control means (127p, 147p) for controlling rotational speed of the drive means based on an inputted rotational speed command value (S127, S147), working mode setting means (8) for outputting a working mode signal (H, M, L, S) for setting a kind of soil to be modified, and a controller (106) for outputting the rotational speed command value corresponding to the working mode signal to the speed control means.

Abstract: A rotational speed controller for mixing equipment of a soil modifying machine, by which optional quality of modified soil can be obtained, is provided. To this end, the rotational speed controller includes a mixer (127, 147) rotating to mix soil to be modified, drive means (127b, 147b) for rotationally driving the mixer, speed control means (127p, 147p) for controlling rotational speed of the drive means based on an inputted rotational speed command value (S127, S147), working mode setting means (8) for outputting a working mode signal (H, M, L, S) for setting a kind of soil to be modified, and a controller (106) for outputting the rotational speed command value corresponding to the working mode signal to the speed control means.

Abstract: The invention relates to a method and device for crushing and mixing soil and a soil improving agent in order to regenerate soft or sticky soil. According to the method of the invention, the soil and the soil improving agent are cut, crushed, and mixed by a crusher (7) in a primary cutting, crushing, and mixing process, and are then struck, crushed, and mixed in a secondary cutting, crushing, and mixing process. The device of the invention comprises the crusher (7), a rotary cutter (13) at the upper part of the crusher (7), a striker (10B) at the lower part thereof, and a conveyor (8) arranged on a vehicle body (3).

Abstract: The present invention provides a crawler type soil improving machine for efficiently crushing and mixing soft soil and a soil improving agent in order to regenerate such soil, and features excellent mobility and operability. The soil improving machine comprises: a crusher (4), disposed substantially at the center of a vehicle body (3), for crushing and mixing soil and a soil improving agent; a first hopper (40), disposed at one part of the vehicle body (3), for receiving soil; a second hopper (20), positioned between the crusher (4) and the first hopper (40), for receiving soil improving agent; a crawling member (2), arranged under the second hopper (20) and the vehicle body (3); a drive unit (5), arranged at the other part of the vehicle body (3) and including an engine (6) and hydraulic units (9, 10); and a conveyor (50), positioned below the first and second hoppers (40 and 20).