Importance

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Abstract

There is provided a dump truck that, when drive wheels (6) slip, is capable of reducing braking torques for the drive wheels (6) to avoid locking of the drive wheels (6), and of generating braking torques for driven wheels (7) to ensure an overall braking torque for the vehicle. The dump truck includes a controller (13) outputting a regenerative torque command value corresponding to an operation amount of a brake pedal (8) to an inverter (11), causing the inverter to regeneratively control electric motors (10), a hydraulic valve (15) for generating a hydraulic pressure corresponding to an operation amount of a brake pedal (9), rear wheel brakes (16) actuated by the hydraulic pressure from the hydraulic valve (15), a higher-pressure selecting valve (19) for selecting a higher one of the hydraulic pressure from the hydraulic valve (15) and a hydraulic pressure from a solenoid proportional valve (18), and front wheel brakes (17) actuated by the hydraulic pressure selected by the higher-pressure selecting valve (19). The controller (13) reduces the regenerative torque command value and output a drive command value corresponding to the reduction amount of the regenerative torque command value to the solenoid proportional valve (18), when the controller (13) determines that slip ratios of the rear wheels (6) are equal to or larger than a predetermined value.

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First Claim