Electrically Driven Single-Axle Tractor

Abstract

The present invention relates to an electrically driven single-axle tractor for coupling with, and powering of, various pieces of equipment, comprising: a frame; a drive axle, connected to the tractor frame, provided with one pair of wheels; a primary electric motor coupled to the drive axle; at least a secondary electric motor coupled to an equipment drive shaft for releasable coupling with a piece of equipment; and, at least one electrical energy source, as power supply of the primary and secondary electric motor. The invention also provides an assembly of such a tractor and a piece of equipment as well as a method for driving such a tractor.

Claims

1. An electrically driven single-axle tractor for coupling with, and powering of, various pieces of equipment, comprising: a frame; a drive axle, connected to the tractor frame, provided with one pair of wheels; a primary electric motor coupled to the drive axle; an equipment drive shaft for releasable coupling with a piece of equipment; and, at least one electrical energy source, as power supply of the primary electric motor; wherein the tractor is further provided with at least one secondary electric motor, which secondary electric motor is coupled to the equipment drive shaft, wherein the at least one electrical energy source is also a power supply of the secondary electric motor, wherein the drive axle and the equipment drive shaft are mutually substantially perpendicular oriented, and wherein the primary electric motor is only connecting to the wheels on the drive axle and the secondary electric motor is only connecting to the equipment drive shaft.

2. The tractor according to claim 1, characterized in that the drive axle and the equipment drive shaft are independently controllable.

3. The tractor according to claim 2, characterized in that the primary electric motor is embodied as at least one hub electric motor.

4. The tractor according to claim 1, characterized in that the equipment drive shaft is oriented at a central position of the tractor.

5. The tractor according to claim 1, characterized in that the equipment drive shaft is provided with coupling for cooperation with a piece of equipment.

6. The tractor according to claim 1, characterized in that the electrical energy source is a supercapacitor, fuel cell and/or a battery, and is preferably rechargeable.

7. The tractor according to claim 1, characterized in that the tractor comprises at least one solar panel.

8. The tractor according to claim 1, characterized in that the tractor comprises a DC/DC and/or a AC/DC converter.

9. The tractor according to claim 1, characterized in that the tractor comprises at least one brake connected to at least one wheel.

10. The tractor according to claim 1, characterized in that the tractor comprises an electronic control unit and/or an electrical energy source management system.

11. An assembly of an electrically driven tractor according to claim 1 and a piece of equipment selecting from a group consisting of cultivators, harrows, snow removers, ploughs, tillers, chippers, sweepers, mowers, transplanters, seeders, spaders, bedformers, ridgers, coverers, mulch layers, scrapers, transporters and trailers.

12. The assembly according claim 11, wherein at least two electrically driven tractors are coupled to a single piece of equipment.

13. A method for driving an electrically driven single-axle tractor according claim 1 characterized in that the drive axle is powered with a primary electric motor and the equipment drive shaft is driven by a secondary electric motor and the operating of the primary electric motor and the secondary electric motor are independently controlled.

14. The tractor according to claim 2, characterized in that the equipment drive shaft is oriented at a central position of the tractor.

15. The tractor according to claim 2, characterized in that the equipment drive shaft is provided with coupling for cooperation with a piece of equipment.

16. The tractor according to claim 2, characterized in that the electrical energy source is a supercapacitor, fuel cell and/or a battery, and is preferably rechargeable.

17. The tractor according to claim 2, characterized in that the tractor comprises at least one solar panel.

18. The tractor according to claim 2, characterized in that the tractor comprises a DC/DC and/or a AC/DC converter.

19. The tractor according to claim 2, characterized in that the tractor comprises at least one brake connected to at least one wheel.

20. The tractor according to claim 2, characterized in that the tractor comprises an electronic control unit and/or an electrical energy source management system.

21. An assembly of an electrically driven tractor according to claim 2, and a piece of equipment selecting from a group consisting of cultivators, harrows, snow removers, ploughs, tillers, chippers, sweepers, mowers, transplanters, seeders, spaders, bedformers, ridgers, coverers, mulch layers, scrapers, transporters and trailers.

22. The assembly according to claim 21, wherein at least two electrically driven tractors are coupled to a single piece of equipment.

23. A method for driving an electrically driven single-axle tractor according claim 2, characterized in that the drive axle is powered with a primary electric motor and the equipment drive shaft is driven by a secondary electric motor and the operating of the primary electric motor and the secondary electric motor are independently controlled.

Description

[0033] The present invention will be further elucidated on the basis of the non-limitative exemplary embodiments shown in the following figures. Herein shows:

[0034] FIG. 1 a schematic representation of a cross-section of an assembly of an electrically driven tractor according to the invention and a piece of equipment, here a plough;

[0035] FIG. 2 a perspective view of another embodiment of a tractor according to the invention;

[0036] FIG. 3 a perspective view of an assembly of an electrically driven tractor according the invention and a piece of equipment, here an trailer, and

[0037] FIG. 4 a perspective view on a further embodiment of the electrically driven tractor according to the invention.

[0038] FIG. 1 shows a single-axle tractor (1) for coupling with, and powering of, various pieces of equipment (50), here a plough (50). The tractor (1) is provided with a frame (2), a drive axle (3), connected to the tractor frame (2) that also has two wheels (4). A primary electric motor (5) is coupled to the drive axle (3). Furthermore are shown an equipment drive shaft (6) for releasable coupling with the piece of equipment (50) and two batteries (8) functioning as the power supply of the primary electric motor (5). The equipment drive shaft (6) is oriented perpendicular to the drive axle (3) enabling a simple coupling with the piece of equipment (50). The tractor (1) also has a secondary electric motor (7), which secondary electric motor (7) is coupled to the equipment drive shaft (6). The equipment drive shaft (6) is provided with coupling means (not shown) for cooperation with the piece of equipment (50). The primary electric motor (5) is exclusively connecting to the wheels (4) on the drive axle (3), and the secondary electric motor (7) is exclusively connecting to the equipment drive shaft (6). The tractor (1) is also provided with an electronic control unit (9), a steering rod (10), which steering rod (10) carrying handlebars (11) for manual engagement.

[0039] FIG. 2 shows a second embodiment of a single-axle tractor (20) according to the invention comprising a solar panel (22), which solar panel (22) is connected to the steering rod (10). The single-axle tractor (20) as shown in this picture is not coupled to a piece of equipment.

[0040] FIG. 3 shows a third embodiment of a single-axle tractor (30) according to the invention in line with the tractor (1) a shown in FIG. 1, now coupled to a an trailer (31). The trailer (31) has a drive shaft (32) coupled to the wheels (33) of the trailer (31). The drive shaft (32) of the trailer (31) is coupled to the equipment drive shaft (not visible in this picture) if the tractor (30) thus enabling the tractor (30) to drive the wheels (33) of the trailer (31) as well. The trailer (31) is further provided with a seat (34) for an operator driving the tractor (30)/trailer (31) assembly as depicted.

[0041] FIG. 4 shows a fourth embodiment of a single-axle tractor (40) according to the invention. The tractor (40) is provided with a steering arm (41), which steering arm (41) carries handlebars (42) for manual engagement. The steering arm (41) may be rotated to either side of the single-axle tractor (40) thus further enhancing the flexibility in use of the single-axle tractor (40). For instance piece of equipment (not shown in this figure) may be coupled to the single-axle tractor (40) on the side of the operator or on the opposite side of the operator just by relocating the position of the steering arm (41). Clearly visible is also that an equipment drive shaft (43) is located in the middle between wheels (44) and oriented perpendicular to a drive axle (45) connecting the wheels (44).

[0042] It will be apparent that the invention is not limited to the exemplary embodiments shown and described here, but that within the scope of the appended claims numerous variants are possible which will be self-evident to the skilled person in this field.