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Re: 'Collar shift' ...huh?
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Posted by Ken McWilliams on October 09, 2001 at 20:21:46 from (152.163.205.82):
In Reply to: 'Collar shift' ...huh? posted by Dan on October 08, 2001 at 06:14:08:
Collar shift transmissions are also known as constant mesh transmissions. All the driven gears are engaged all the time by the driving gears. The collar slips over a small straight cut side gear on the helical gear and the collar is splined so that the gear engaged is mechanically connected to the shaft on which they're rotating. The primary purpose for collar shifting is to use helical cut gears that are quieter. If you you would try to have sliding gears using helical cut gears the angle on the teeth would induce side thrust and cause the gears to separate. Straight cut gears are noiser, but are used for the sliding gear arrangement. The straight cut gears don't induce side thrust as do helical cut gears and thus, you can use only a detent in the shifting mechanism to hold them together. The sliding collar does not induce a side thrust when engaged and thus, a detent will hold it engaged. The side thrust of the helical cut gears are already compensated by using thrust washers and thrust bearings. I thought everyone knew this. Ken McWilliams
Dayton, OH
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