Electric drive mower with motor generator set

• US 5,794,422 A
• Filed: 11/13/1995
• Issued: 08/18/1998
• Est. Priority Date: 11/13/1995
• Status: Expired due to Term

• Current Assignee: Textron Innovations Incorporated (Textron Inc)
• Original Assignee: Ransomes America Corporation (Textron Inc)
• Inventors: Weeratunga, Dammika, Reimers, Kirk W.
• Primary Examiner(s): MELIUS, TERRY L
• Application Number:
  US08/557,778
• Time in Patent Office: 1,009 Days
• Field of Search: 56/7, 56/11.9, 56/10.1, 56/10.6, 56/10.8, 180/165, 180/900
• US Class Current: 56/11.9
• CPC Class Codes: A01D 34/006 Control or measuring arrangements
• CPC Class Codes: A01D 34/58 electric
• CPC Class Codes: A01D 69/00 Driving mechanisms or parts thereof for harvesters or mowers driving mechanisms for the cutters of mowers or harvesters A01D34/00
• CPC Class Codes: A01D 69/02 electric
• CPC Class Codes: A01D 69/03 fluid
• CPC Class Codes: A01D 75/306 for lawn mowers positioned one behind the other or side by side
• CPC Class Codes: B60L 2200/40 Working vehicles
• CPC Class Codes: B60L 50/66 Arrangements of batteries
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

Provided is an electric drive riding greens mower. The mower includes a frame which is supported for movement upon a plurality of ground engaging wheels and upon which are supported a motor generator set and a plurality of reel lawn mowers. An electric motor provides driving torque to enable movement of the mower between and over golf course greens or other surfaces to be mowed, electric motors provide driving torque for each of the reel lawn mowers. The motor generator set provides electrical energy for driving the electric motors, including the primary mover and the electrical motors for the reel type lawn mowers. The motor generator set includes an internal combustion motor which provides the mechanical energy to an electric generator which provides electrical energy in response to the received mechanical energy. Further, the mower may include a hydraulic system for operation of reel lift assemblies and the steering mechanism. Hydraulic pressure is supplied by a hydraulic pump powered by one of an electrical motor receiving electrical energy from the generator or directly from the internal combustion engine. The hydraulic motor outputs hydraulic fluid at a pressure sufficient to operate the reel lift and steering mechanisms. Further, the frame member includes a housing which encloses devices which generally operate at substantial noise levels. The housing includes interior and exterior linings which provide passive noise abatement. Within the housing, an active noise abatement system detects and determines ambient noise within the housing and generates output signals which effectively cancel the noise generated within the housing. Such noise abatement assists in providing quiet operation of the mower.

Claims

1. A self-propelled riding mower comprising:

a frame;

a plurality of ground engaging wheels supporting the frame;

means for mechanically generating electrical energy supported from the frame; and

a plurality of reel type lawn mowers supported from the frame and one of the plurality of reel type lawn mowers located forward of each of the plurality of ground engaging wheels, the reel type lawn mowers being moveable between a raised non-operative position and a lowered operative position in which the reel type lawn mowers engage the ground, each reel mower being driven by a respective electric motor which receives electrical power from the means for generating electrical energy.

2. The self propelled riding mower as defined in claim 1 further comprising a prime mover comprising an electric motor supplied with electrical energy from the means for generating electrical energy and adapted to provide driving torque to at least one of the ground engaging wheels.

3. The self-propelled riding mower of claim 1 wherein the means for generating electrical energy comprises a motor generator set.

4. The self-propelled riding mower of claim 1 wherein the means for mechanically generating electrical energy further comprises:

an internal combustion motor; and

a means for generating electrical energy in response to mechanical motion, the internal combustion motor operatively connected to the generating means to impart the mechanical motion required to generate electrical energy.

5. The self propelled riding mower as defined in claim 4 further comprising a regulator circuit for modulating the electrical output of the means for generating electrical energy.

6. The self-propelled riding mower of claim 5 wherein the means for mechanically generating electrical energy further comprises a circuit for monitoring the electrical output of the generator means and the electrical output of the regulator circuit, the circuit disabling the means for generating electrical energy from outputting electrical energy when the circuit detects a non-standard electrical energy output condition.

7. The self-propelled riding mower of claim 1 further comprising a source of stored electrical energy, the source of stored electrical energy providing electrical energy in addition to the electrical energy output by the means for generating electrical energy.

8. The self-propelled riding mower of claim 1 further having a hydraulic fluid system comprising:

hydraulic fluid stored in a reservoir;

hydraulic pressure generating means for receiving hydraulic fluid from the reservoir at an input pressure and providing hydraulic fluid at an output pressure; and

a hydraulically actuated device responsive to the application of hydraulic fluid pressure provided by the hydraulic pressure generating means.

9. The self-propelled riding mower of claim 8 further comprising an electric motor operatively connected to and driving the hydraulic pressure generating means, the electric motor receiving electrical energy from the means for generating electrical energy to operate the electric motor.

10. The self-propelled riding mower of claim 9 further comprising a clutch interconnecting the electric motor and the hydraulic pressure generating means in order to vary the force transferred between the electric motor and hydraulic pressure generating means.

11. The self-propelled riding mower of claim 8 further comprising a source of stored electrical energy, the source of stored electrical energy also providing electrical energy in addition to the electrical energy output by the means for generating electrical energy.

12. The self propelled riding mower as defined in claim 11 further comprising an electric motor driving the hydraulic pressure generating means, where electrical energy output by the means for storing electrical energy is applied to the electric motor to operate the pressure generating means.

13. The self-propelled riding mower of claim 12 further comprising a clutch interconnecting the electric motor and the hydraulic pressure generating means in order to vary the force applied to the electric motor to the hydraulic pressure generating means.

14. The self-propelled riding mower of claim 8 wherein the means for mechanically generating electrical energy further comprises:

an internal combustion motor; and

a means for generating electrical energy in response to mechanical motion, the internal combustion motor operatively connected to the generating means to impart the mechanical motion required to generate electrical energy.

15. The self-propelled riding mower of claim 14 wherein the internal combustion motor mechanically powers the source of hydraulic fluid pressure.

16. The self-propelled riding mower of claim 14 further comprising a clutch interconnecting the hydraulic pressure generating means and the internal combustion motor in order to vary the force transferred between the internal combustion motor and hydraulic pressure generating means.

17. The self-propelled riding mower of claim 8 wherein there are at least three ground engaging wheels and wherein the prime mover further comprises a drive axle positioned between two of the wheels for delivering driving torque to each of the two wheels and wherein the third wheel is located rearward of the drive axle and may be rotatably displaced to steer the turf mower.

18. The self-propelled riding mower of claim 17 further comprising a hydraulic piston responsive to hydraulic fluid pressure provided by the hydraulic pressure generating means and operatively connected to the third wheel so that extension of the hydraulic piston rotatably displaces the third wheel in a first direction and retraction of the hydraulic piston rotatably displaces the third wheel in an opposite direction to steer the turf mower.

19. A self-propelled riding mower comprising:

a frame;

a plurality of ground engaging wheels supporting the frame;

an internal combustion motor supported from the frame;

a means for generating electrical energy in response to mechanical motion, the internal combustion motor operatively connected to the generating means to impart the mechanical motion required to generate electrical energy;

a plurality of reel type lawn mowers supported from the frame and one of the plurality of reel type lawn mowers located forward of each of the plurality of ground engaging wheels, each reel mower being driven by a respective electric motor which receives electrical power from the means for generating electrical energy; and

a prime mover adapted to provide driving torque to at least one of the ground engaging wheels, the prime mover comprising an electric motor supplied with electrical energy from the means for generating electrical energy.

20. The self propelled riding mower as defined in claim 19 wherein the means for generating electrical energy outputs a direct current electrical signal, and the prime mover is an electric motor powered by a direct current electrical signal.

21. The self propelled riding mower as defined in claim 19 wherein the means for generating electrical energy outputs an alternating current electrical signal, and the prime mover is an electric motor powered by an alternating current electrical signal.

22. The self propelled riding mower as defined in claim 19 further comprising a voltage regulator for monitoring the voltage output by the means for generating electrical energy, the voltage regulator modulating the voltage output by the means for generating electrical energy and supplying a regulated voltage for use by the electrical components of the mower.

23. The self propelled riding mower as defined in claim 19 wherein the means for generating electrical energy outputs an alternating current electrical signal, and the prime mover is an electric motor powered by a direct current electrical signal, and the mower further comprises a means for transforming the alternating current electrical signal into a direct current electrical signal for application to the electric motor.

24. The self-propelled riding mower as defined in claim 23 further comprising a source of stored electrical energy, the source of stored electrical energy providing electrical energy to the electric motor in addition to the means for generating electrical energy.

25. The self-propelled riding mower as defined in claim 23 further comprising a motor controller for modulating the electrical energy applied to the prime mover, thereby varying the output of the prime mover in accordance with the modulated energy applied to the prime mover.

26. The self propelled riding mower as defined in claim 19 wherein the means for generating electrical energy outputs a direct current electrical signal, and the prime mover is an electric motor powered by a direct current electrical signal, and the mower further comprises a means for modulating the electrical output of the means for generating electrical energy for application to the electric motor.

27. The self-propelled riding mower as defined in claim 26 further comprising a source of stored electrical energy, the source of stored electrical energy providing electrical energy to the electric motor in addition to the means for generating electrical energy.

28. The self-propelled riding mower as defined in claim 26 further comprising a motor controller for modulating the electrical energy applied to the prime mover, thereby varying the output of the prime mover in accordance with the modulated energy applied to the prime mover.

29. The self propelled riding mower as defined in claim 19 wherein the means for generating electrical energy outputs an alternating current electrical signal, and the prime mover is an electric motor powered by an alternating current electrical signal, and the mower further comprises a means for modulating the electrical output of the means for generating electrical energy for application to the electric motor.

30. The self-propelled riding mower as defined in claim 29 further comprising a source of stored electrical energy, the source of stored electrical energy providing electrical energy to the electrical motor in addition to the means for generating electrical energy.

31. The self-propelled riding mower as defined in claim 29 further comprising a motor controller for modulating the electrical energy applied to the prime mover, thereby regulating the output of the prime mover in accordance with the modulated energy applied to the prime mover.

32. The self propelled riding mower as defined in claim 19 wherein the means for generating electrical energy outputs a direct current electrical signal, and the prime mover is an electric motor powered by an alternating current electrical signal, and the mower further comprises a means for modulating the electrical output of the means for generating electrical energy for application to the electric motor.

33. The self-propelled riding mower as defined in claim 32 further comprising a source of stored electrical energy, the source of stored electrical energy providing electrical energy to the electric motor in addition to the means for generating electrical energy.

34. The self-propelled riding mower as defined in claim 32 further comprising an inverter for transforming the direct current signal output by the means for generating electrical energy to an alternating current electrical signal for application to the prime mover, and further regulating the output of the prime mover in accordance with varying the input voltage applied to the prime mover.

35. The self propelled riding mower as defined in claim 19 further comprising a motor controller for modulating the electrical energy applied to the prime mover, thereby regulating the output of the electric motor in accordance with the modulated energy applied to the prime mover.

36. The self-propelled riding mower as defined in claim 19 further comprising an electronic control module for receiving operator input to direct operation of the prime mover and for generating control signal to at least one of a voltage regulator or a motor controller.

37. The self-propelled riding mower as defined in claim 36 wherein the operator inputs include at least one of a drive pedal signal, a brake pedal signal, and operator mower request signal.

38. The self-propelled riding mower as defined in claim 36 wherein the electronic control circuit further comprises a reel motor controller and a lift motor controller corresponding to each of the respective reel motors and lift motors.

39. A self-propelled riding mower comprising:

a frame;

a plurality of ground engaging wheels supporting the frame;

means for mechanically generating electrical energy;

hydraulic pressure generating means for receiving hydraulic fluid at an input pressure and providing hydraulic fluid at an output pressure;

drive means powered by electrical energy produced by the means for generating electrical energy, the drive means providing mechanical drive to the hydraulic pressure generating means to enable the output of hydraulic fluid at the output pressure; and

a plurality of reel type lawn mowers supported from the frame and one of the plurality of reel type lawn mowers located forward of each of the plurality of ground engaging wheels, the reel type lawn mowers being moveable between a raised non-operative position and a lowered operative position in which the reel type lawn mowers engage the ground, each reel mower being driven by a respective electric motor which receives electrical power from the means for generating electrical energy.

40. The self propelled riding mower as defined in claim 39 wherein the drive means further comprises an electric motor.

41. The self-propelled riding mower as defined in claim 39 further comprising a pump motor controller for modulating the electrical energy applied to the drive means to modulate the electrical energy applied to the drive means, thereby varying the hydraulic fluid output pressure in accordance with the modulated electrical energy.

42. The self-propelled riding mower as defined in claim 39 further comprising a voltage regulator receiving as input electrical energy from the means for mechanically generating electrical energy and providing an output electrical energy within a predetermined range.