Downshifting work vehicle using differential lock switch
First Claim
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1. A self-propelled work vehicle for performing a work operation, the vehicle comprising:
- a supporting structure;
ground engaging wheels mounted to the support structure;
a prime mover supported by the supporting structure, the prime mover supplying power to the vehicle;
a transmission operatively coupled between the prime mover and the ground engaging wheels for propelling the vehicle, the transmission having at least two gear positions, the transmission is also provided with a lockable differential, the lockable differential having an actuation switch for locking the lockable differential; and
a control system for shifting the transmission from one gear to the other, the control system having a control switch that triggers the system and is interconnected with the differential lock switch, whereby actuation of the differential lock switch triggers the control system for shifting the transmission when the control switch is actuated.
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Abstract
The differential lock switch for a work vehicle is used to trigger a control system for downshifting the vehicle from second to first. The control system comprises five relays. The first three relays detect if the vehicle is in second; if the vehicle is going forward; and if the differential lock switch is actuated. The fourth relay is used to latch the signal from the third relay so that the differential lock switch can be released and the vehicle will remain in first. The fifth relay receives signals from the first four relays and manipulates the correct solenoid valves for downshifting the vehicle.
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Citations
14 Claims
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1. A self-propelled work vehicle for performing a work operation, the vehicle comprising:
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a supporting structure; ground engaging wheels mounted to the support structure; a prime mover supported by the supporting structure, the prime mover supplying power to the vehicle; a transmission operatively coupled between the prime mover and the ground engaging wheels for propelling the vehicle, the transmission having at least two gear positions, the transmission is also provided with a lockable differential, the lockable differential having an actuation switch for locking the lockable differential; and a control system for shifting the transmission from one gear to the other, the control system having a control switch that triggers the system and is interconnected with the differential lock switch, whereby actuation of the differential lock switch triggers the control system for shifting the transmission when the control switch is actuated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification