Track drive

Patent metadata

Field	Value
Publication number	US-9902441-B2
Application number	US-201715450896-A
Country	US
Kind code	B2
Filing date	Mar 6, 2017
Priority date	Aug 21, 2014
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

Provided is a track drive for outdoor power equipment including a support frame and a drive axle configured to attach to an associated drive hub. A hub bearing is mounted on the drive axle and the support frame enabling the drive axle to rotate relative to the support frame. A drive sprocket is attached to the drive axle and includes an interior half sprocket and an exterior half sprocket. The half sprockets are located on either side of the support frame. Drive teeth are spaced radially about the drive sprocket. The drive sprocket is movably engaged with an endless track to transmit force to rotate the endless track and propel the outdoor power equipment. A kit for adding or replacing a track drive of outdoor power equipment is also provided.

First claim

What is claimed is:

1. A track drive for outdoor power equipment comprising:
a support frame;
a drive axle configured to attach to an associated drive hub on said outdoor power equipment;
a hub bearing mounted on said drive axle and said support frame, said hub bearing enables said drive axle to rotate relative to said support frame;
a drive sprocket attached to said drive axle, wherein said drive sprocket comprises an interior half sprocket and an exterior half sprocket, said half sprockets are located on either side of said support frame, wherein said drive sprocket comprises drive teeth spaced radially about said drive sprocket;
an endless track, and
a hub bearing, wherein said hub bearing is located a distance of about the width of said hub bearing from a mounting plane with an associated outdoor power equipment unit,
wherein said drive sprocket is movably engaged with said endless track to transmit force to rotate said endless track and propel said outdoor power equipment.

2. The track drive according to claim 1 , wherein said support frame is located substantially along the center line of said endless track.

3. The track drive according to claim 1 , wherein said support frame defines an aperture, said aperture being located substantially on a center line of said support frame with respect to a forward side and a rear side of said support frame, and said drive axle passes through said aperture.

4. The track drive according to claim 1 , wherein said track drive is configured to be attached to the associated drive hub by simply applying a fastener to a single assembly.

5. The track drive according to claim 4 , wherein said exterior half sprocket defines an oversize hole enabling a fastener to be applied to the associated drive hub to fasten the track drive to said outdoor power equipment.

6. The track drive according to claim 1 , further comprising a track tensioning mechanism to maintain tension on said endless track.

7. The track drive according to claim 6 , wherein said track tensioning mechanism comprises a threaded component to maintain tension on said endless track.

8. The track drive according to claim 6 , wherein said track tensioning mechanism comprises a spring device to maintain tension on said endless track.

9. The track drive according to claim 1 , further comprising:
a plurality of idler wheels;
a plurality of bogie wheels; and
an outer support link attached to said support frame, said outer support link is configured to support said idler wheels and said bogie wheels.

10. The track drive according to claim 9 , wherein said endless track further comprises:
a plurality of guide lugs which locate said endless track with respect to said idler wheels and said bogie wheels; and
a plurality of drive lugs which enable transfer of power between said drive sprocket and said endless track.

11. The track drive according to claim 10 , wherein said idler wheels and said bogie wheels are positioned between said drive lugs and said guide lugs.

12. The track drive according to claim 9 , wherein a weight of said outdoor power equipment is transferred through said associated drive hub, said drive axle, said support frame, said bogie wheels and said idler wheels, said endless track, and into an associated driving surface, and said drive sprocket is engaged with said endless track at a top portion of said drive sprocket and not engaged with said endless track at a bottom portion of said drive sprocket.

13. The track drive according to claim 1 , wherein said drive sprocket is disc-shaped.

14. The track drive according to claim 1 , wherein said half sprockets are identical.

15. An outdoor power equipment unit comprising:
a track drive, said track drive comprising:
a support frame;
a drive axle configured to attach to an associated drive hub on said outdoor power equipment;
a hub bearing mounted on said drive axle and said support frame, said hub bearing enables said drive axle to rotate relative to said support frame;
a drive sprocket attached to said drive axle, wherein said drive sprocket comprises an interior half sprocket and an exterior half sprocket, said half sprockets are located on either side of said support frame, wherein said drive sprocket comprises drive teeth spaced radially about said drive sprocket;
an endless track, and
a hub bearing, wherein said hub bearing is located a distance of about the width of said hub bearing from a mounting plane with an associated outdoor power equipment unit,

wherein said drive sprocket is movably engaged with said endless track to transmit force to rotate said endless track and propel said outdoor power equipment.

16. The outdoor power equipment unit according to claim 15 , wherein said support frame is located substantially along the center line of said endless track.

17. A kit for adding or replacing a track drive of outdoor power equipment comprising:
a. a track drive assembly comprising:
a support frame;
a drive axle configured to attach to an associated drive hub on said outdoor power equipment;
a hub bearing mounted on said drive axle and said support frame, said hub bearing enables said drive axle to rotate relative to said support frame;
a drive sprocket attached to said drive axle, wherein said drive sprocket comprises an interior half sprocket and an exterior half sprocket, said half sprockets are located on either side of said support frame, wherein said drive sprocket comprises drive teeth spaced radially about said drive sprocket; and
an endless track,
wherein said drive sprocket is movably engaged with said endless track to transmit force to rotate said endless track and propel said outdoor power equipment;
a plurality of idler wheels;
a plurality of bogie wheels; and
an outer support link attached to said support frame, said outer support link is configured to support said idler wheels and said bogie wheels, wherein
said drive sprocket and its orientation with respect to said endless track is configured to have an effective rolling radius about the same as a rolling radius of a tire/wheel combination that may be typically attached to said outdoor power equipment; and

b. a plurality of hardware fasteners.

18. A track drive for outdoor power equipment comprising:
a support frame;
a drive axle configured to attach to an associated drive hub on said outdoor power equipment;
a hub bearing mounted on said drive axle and said support frame, said hub bearing enables said drive axle to rotate relative to said support frame;
a drive sprocket attached to said drive axle, wherein said drive sprocket comprises an interior half sprocket and an exterior half sprocket, said half sprockets are located on either side of said support frame, wherein said drive sprocket comprises drive teeth spaced radially about said drive sprocket;
an endless track; and
an outer support link attached to said support frame, said outer support link is configured to support a bogie wheel in a cantilever arrangement,
wherein said drive sprocket is movably engaged with said endless track to transmit force to rotate said endless track and propel said outdoor power equipment,
wherein said drive teeth are configured to engage said endless track within the middle third of a width of said endless track.

Assignees

• Mtd Products Inc

Inventors

• Buchanan Peter J
• Eavenson Sr Jimmy N

Classifications

• B62D55/04

  with tracks and alternative ground wheels, e.g. changeable from endless track vehicle into wheeled vehicle and vice versa {(for multi-purpose tractors B62D49/0635)} · CPC title

• B62D55/125 Primary

  Final drives · CPC title

• B62D55/14

  Arrangement, location, or adaptation of rollers · CPC title

• B62D55/10

  Bogies; Frames (track-tensioning means B62D55/30) · CPC title

• B62D55/24

  of continuously flexible type, e.g. rubber belts · CPC title