Riding work vehicle
First Claim
Patent Images
1. A riding work vehicle, comprising:
- right and left wheels as main driving wheels that are respectively driven independently for traveling;
at least one caster wheel as a steering control wheel whose operational state is selectable between free traveling and forced traveling and also between free steering and forced steering;
a working machine that is operable for work on the ground;
a traveling motor configured to drive the caster wheel for traveling;
a steering motor configured to steer the caster wheel;
a traveling system clutch that is provided in a traveling system power transmission path for transmitting the power from the traveling motor to an axle of the caster wheel and is configured to disable transmission of the rotational force from the axle to the traveling motor in a state where the traveling motor is deactivated; and
a steering system clutch that is provided in a steering system power transmission path for transmitting the power between the steering motor and a steering shaft for the caster wheel and is configured to disable transmission of the rotational force from the steering shaft to the steering motor in a state where the steering motor is deactivated.
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Abstract
A riding work vehicle includes right and left wheels, at least one caster wheel, and a working machine. The lawnmower vehicle further includes traveling motor, steering motor, a traveling system clutch, and a steering system clutch. The traveling system clutch is configured to disable transmission of the rotational force from an axle of the caster wheel to the traveling motor in a state where the traveling motor is deactivated. The steering system clutch is configured to disable transmission of the rotational force from a steering shaft for the caster wheel to the steering motor in a state where the steering motor is deactivated.
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Citations
8 Claims
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1. A riding work vehicle, comprising:
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right and left wheels as main driving wheels that are respectively driven independently for traveling; at least one caster wheel as a steering control wheel whose operational state is selectable between free traveling and forced traveling and also between free steering and forced steering; a working machine that is operable for work on the ground; a traveling motor configured to drive the caster wheel for traveling; a steering motor configured to steer the caster wheel; a traveling system clutch that is provided in a traveling system power transmission path for transmitting the power from the traveling motor to an axle of the caster wheel and is configured to disable transmission of the rotational force from the axle to the traveling motor in a state where the traveling motor is deactivated; and a steering system clutch that is provided in a steering system power transmission path for transmitting the power between the steering motor and a steering shaft for the caster wheel and is configured to disable transmission of the rotational force from the steering shaft to the steering motor in a state where the steering motor is deactivated. - View Dependent Claims (2, 3, 4)
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5. A riding work vehicle, comprising:
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right and left wheels as main driving wheels that are respectively driven independently for traveling; at least one caster wheel as a steering control wheel whose operational state is selectable between free traveling and forced traveling and also between free steering and forced steering; a working machine that is operable for work on the ground; a traveling motor configured to drive the caster wheel for traveling; a steering motor configured to steer the caster wheel; a traveling system clutch that is provided in a traveling system power transmission path for transmitting the power from the traveling motor to an axle of the caster wheel and is configured to disable transmission of the rotational force from the axle to the traveling motor in a state where the traveling motor is deactivated; a steering system clutch that is provided in a steering system power transmission path for transmitting the power between the steering motor and a steering shaft for the caster wheel and is configured to disable transmission of the rotational force from the steering shaft to the steering motor in a state where the steering motor is deactivated; and a steering angle sensor that is provided on a downstream side of the steering system clutch in a power transmission direction of the steering system power transmission path and is configured to detect the steering angle of the steering shaft or a portion connected to the steering shaft. - View Dependent Claims (6)
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7. A riding work vehicle, comprising:
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right and left wheels as main driving wheels that are respectively driven independently for traveling; at least one caster wheel as a steering control wheel whose operational state is selectable between free traveling and forced traveling and also between free steering and forced steering; a working machine that is operable for work on the ground; a traveling motor configured to drive the caster wheel for traveling; a steering motor configured to steer the caster wheel; a traveling system clutch that is provided in a traveling system power transmission path for transmitting the power from the traveling motor to an axle of the caster wheel and is configured to disable transmission of the rotational force from the axle to the traveling motor in a state where the traveling motor is deactivated; and a steering system clutch that is provided in a steering system power transmission path for transmitting the power between the steering motor and a steering shaft for the caster wheel and is configured to disable transmission of the rotational force from the steering shaft to the steering motor in a state where the steering motor is deactivated; wherein the traveling system clutch is configured to switch its operational state between an engaged state and a disengaged state according to a control signal input from the control unit, the steering system clutch is configured to switch its operational state between an engaged state and a disengaged state according to a control signal input from the control unit, and the control unit is configured to constantly engage the steering system clutch when the traveling system clutch is engaged.
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8. A riding work vehicle, comprising:
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right and left wheels as main driving wheels that are respectively driven independently for traveling; at least one caster wheel as a steering control wheel whose operational state is selectable between free traveling and forced traveling and also between free steering and forced steering; a working machine that is operable for work on the ground; a traveling motor configured to drive the caster wheel for traveling; a steering motor configured to steer the caster wheel; a two-way traveling system clutch that is provided in a traveling system power transmission path for transmitting the power from the traveling motor to an axle of the caster wheel and is configured to disable transmission of the rotational force from the axle to the traveling motor in a state where the traveling motor is deactivated; and a steering system clutch that is provided in a steering system power transmission path for transmitting the power between the steering motor and a steering shaft for the caster wheel and is configured to disable transmission of the rotational force from the steering shaft to the steering motor in a state where the steering motor is deactivated; a hill-climbing detection sensor configured to detect whether the vehicle is in a hill-climbing state, and a control unit that controls the traveling motor configured to drive the caster wheel for traveling such that if it is determined that the vehicle is in the hill-climbing state, the traveling speed of the caster wheel relative to the ground is controlled to be higher than the travelling speed of the right and left wheels relative to the ground.
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Specification