A drive sprocket for a snowmobile, a drive train using the sprocket, and a method of using the sprocket to drive a track for a snowmobile. The drive sprocket includes a round base, a plurality of convolute lugs on the base, and a plurality of involute lugs on both sides of the base. The base is pre
A drive sprocket for a snowmobile, a drive train using the sprocket, and a method of using the sprocket to drive a track for a snowmobile. The drive sprocket includes a round base, a plurality of convolute lugs on the base, and a plurality of involute lugs on both sides of the base. The base is preferably disk shaped, and the convolute lugs are preferably aligned with the involute lugs. In the preferred embodiment, a number of convolute lugs is one half a number of involute lugs. The convolute lugs should line up with windows in a track for the snowmobile, and the involute lugs should line up with gaps between knobs on the track for the snowmobile. Preferably, the sprocket also includes a hub with a through hole for a drive shaft and stiffening arms radiating from the hub.
대표청구항▼
What is claimed is: 1. A drive sprocket for a snowmobile that includes a track including windows and knobs on both sides of the windows, comprising: a round base; a plurality of convolute lugs on the base that line up with the windows in the track; and a plurality of involute lugs on both sides of
What is claimed is: 1. A drive sprocket for a snowmobile that includes a track including windows and knobs on both sides of the windows, comprising: a round base; a plurality of convolute lugs on the base that line up with the windows in the track; and a plurality of involute lugs on both sides of the base that line up with gaps between the knobs on the track; wherein if the involute lugs push on the knobs on both sides of the windows, the convolute lugs push on edges of the windows, wherein the involute lugs are as wide as where the involute lugs meet the base as a width of the convolute lugs where the convolute lugs meet the base. 2. A drive sprocket as in claim 1, wherein the base is disk shaped. 3. A drive sprocket as in claim 1, wherein the convolute lugs are aligned with the involute lugs. 4. A drive sprocket as in claim 1, wherein a number of convolute lugs is one half a number of involute lugs. 5. A drive sprocket as in claim 4, wherein the number of convolute lugs is nine or ten, and the number of involute lugs is eighteen or twenty. 6. A drive sprocket as in claim 1, wherein the convolute lugs line up with the windows in the track for the snowmobile, and the involute lugs line up with gaps between the knobs on the track for the snowmobile. 7. A drive sprocket as in claim 1, further comprising a hub with a through hole for a drive shaft and stiffening arms radiating from the hub, wherein the stiffening arms include braces for the involute lugs. 8. A drive sprocket as in claim 1, further comprising raised rims on each side of the base, the raised rims stiffening the base. 9. A drive sprocket as in claim 1, wherein the convolute lugs further include stiffening ridges. 10. A drive sprocket as in claim 1, wherein said involute lugs have a cross-section of an oval curved around an outside edge of said round base. 11. A method of driving a track for a snowmobile that includes a track including windows and knobs on both sides of the windows, comprising the steps of: pushing on edges of the windows; and pushing on the knobs on both sides of the window; wherein the pushing steps are carried out by at least one drive sprocket that rotates to drive the track, each drive sprocket further comprising a round base, a plurality of convolute lugs on the base, and a plurality of involute lugs on both sides of the base; and wherein if the involute lugs push on the knobs on both sides of the windows, the convolute lugs push on edges of the windows, wherein the involute lugs are as wide as where the involute lugs meet the base as a width of the convolute lugs where the convolute lugs meet the base. 12. A method as in claim 11, wherein the convolute lags line up with the windows in the track, and the involute lugs line up with gaps between the knobs on the track. 13. A method as in claim 11, wherein the number of drive sprockets carrying out the pushing steps for the snowmobile is exactly two. 14. A drive train for a snowmobile, comprising: a drive shaft; a track including windows and knobs on both sides of the windows; and one or more drive sprockets on the drive shaft, the drive sprockets for driving the track; wherein each drive sprocket further comprises: a round base; a plurality of convolute lugs on the base; and a plurality of involute lugs on both sides of the base; wherein if the involute lugs push on both sides of the windows, the convolute lugs push on edges of the windows, wherein the involute lugs are as wide as where the involute lugs meet the base as a width of the convolute lugs where the convolute lugs meet the base. 15. A drive train as in claim 14, wherein the convolute lugs line up with windows in the track, and the involute lugs line up with gaps between knobs on the track. 16. A drive train as in claim 14, wherein a number of convolute lugs on each drive sprocket is one half a number of involute lugs on each drive sprocket. 17. A drive train as in claim 14, further comprising a gear on the drive shaft for driving the drive train.
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이 특허에 인용된 특허 (3)
Takeuchi Masashi,JPX ; Yamamoto Masayuki,JPX, Crawler belt apparatus.
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