Electric tractor
First Claim
1. A battery-powered electric tractor comprising:
- a frame;
ground-engaging wheel means for supporting the frame for over-the-ground travel;
storage battery means for storing electric energy;
power-take-off means mounted on the frame for driving implements;
first dedicated electric motor means mounted on the frame for driving only the ground-engaging wheel means and supplied with electric energy from the storage battery means;
mechanical linkage means for transferring motion from the first electric motor means to the ground-engaging wheel means, the mechanical linkage means including transmission means for selecting one of a plurality of ratios between rotational speeds of the first motor means and the ground-engaging wheel means;
second dedicated electric motor means mounted on the frame for driving only the power-take-off means and supplied with electric energy from the storage battery means;
first electric control means for controlling the flow of electric energy from the storage means to the first motor means in response to operator controlled first transducer means; and
overspeed means for preventing the flow of electric energy from the storage means to the motor means when the motor speed reaches an overspeed limit.
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Accused Products
Abstract
An articulated battery-powered electric tractor includes front and rear frame members which are pivotally connected for movement about a substantially vertical axis. A hydraulically-actuated articulation apparatus pivots the front and rear frame members with respect to each other. Wheels support the frame members for travel over the ground. A power-take-off shaft is mounted to the front frame member and is used for driving implements. Electric energy is stored in batteries which are mounted to the rear frame member. The first electric motor is mounted to the rear frame member and is used to drive the tractor wheels. A second electric motor is mounted to the front frame member and is used to drive the power-take-off shaft and the hydraulic articulation apparatus.
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Citations
28 Claims
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1. A battery-powered electric tractor comprising:
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a frame; ground-engaging wheel means for supporting the frame for over-the-ground travel; storage battery means for storing electric energy; power-take-off means mounted on the frame for driving implements; first dedicated electric motor means mounted on the frame for driving only the ground-engaging wheel means and supplied with electric energy from the storage battery means; mechanical linkage means for transferring motion from the first electric motor means to the ground-engaging wheel means, the mechanical linkage means including transmission means for selecting one of a plurality of ratios between rotational speeds of the first motor means and the ground-engaging wheel means; second dedicated electric motor means mounted on the frame for driving only the power-take-off means and supplied with electric energy from the storage battery means; first electric control means for controlling the flow of electric energy from the storage means to the first motor means in response to operator controlled first transducer means; and overspeed means for preventing the flow of electric energy from the storage means to the motor means when the motor speed reaches an overspeed limit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An articulated battery-powered electric vehicle comprising:
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front and rear members pivotally connected for movement about a substantially vertical axis; a plurality of wheel means for supporting the frame members for travel over the ground; articulation means for pivoting the front and rear frame members with respect to each other; power-take-off means mounted to one of the front and rear frame members for driving implements; storage battery means mounted to one of the front and rear frame members for storing electric energy; first dedicated electric motor means mounted to one of the front and rear frame members for driving only the wheel means and supplied with electric energy from the storage batter means; second dedicated electric motor means mounted to one of the front and rear frame members for driving only the power-take-off means and supplied with electric energy from the storage battery means; mechanical linkage means for transferring motion from the first electric motor means to the wheel means, the mechanical linkage means including transmission means for selecting one of a plurality of ratios between rotational speeds of the first motor means and the wheel means; first electric control means for controlling the flow of electric energy from the storage means to the first motor means in response to operator controlled first transducer means; and overspeed means for preventing the flow of electric energy from the storage means to the motor means when the motor speed reaches an overspeed limit. - View Dependent Claims (23, 24, 25)
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26. An articulated battery-powered electric vehicle comprising:
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front and rear members pivotally connected for movement about a substantially vertical axis; a plurality of wheel means for supporting the frame members for travel over the ground; articulation means for pivoting the front and rear frame members with respect to each other; power-take-off means mounted to one of the front and rear frame members for driving implements; storage battery means mounted to one of the front and rear frame members for storing electric energy; first dedicated electric motor means mounted to one of the front and rear frame members for driving only the wheel means and supplied with electric energy from the storage batter means; second dedicated electric motor means mounted to one of the front and rear frame members for driving only the power-take-off means and supplied with electric energy from the storage battery means; mechanical linkage means for transferring motion from the first electric motor means to the wheel means, the mechanical linkage means including transmission means for selecting one of a plurality of ratios between rotational speeds of the first motor means and the wheel means; second electric control means for controlling the flow of electric energy from the storage means to the second motor means in response to operator controlled second transducer means; and overspeed means for preventing the flow of electric energy from the storage means to the motor means when the motor speed reaches an overspeed limit.
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27. A battery-powered electric tractor comprising:
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a frame; ground-engaging wheel means for supporting the frame for over-the-ground travel; storage battery means for storing electric energy; power-take-off means mounted on the frame for driving implements; first electric motor means mounted on the frame for driving only the ground-engaging means supplied with electric energy from the storage means; second electric motor means mounted on the frame for driving the power-take-off means supplied with electric energy from the storage means; second electric control means for controlling the flow of electric energy from the storage means to the second motor means in response to operator controlled second transducer means; and overspeed means for preventing the flow of electric energy from the storage means to the motor means when the motor speed reaches an overspeed limit. - View Dependent Claims (28)
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Specification