Browse Prior Art Database

Gear Train Backlash Reduction

IP.com Disclosure Number: IPCOM000034640D
Original Publication Date: 1989-Mar-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Robinson, CW: AUTHOR [+2]

Abstract

It is common knowledge that in a gear train, due to tolerances and backlash between the teeth of each mating pair of gears, the output gear lags behind the input gear. This is particularly evident immediately after a change in drive direction when backlash between all gears must be taken up before the output gear moves. In applications where it is important for the output to closely follow the input, several known anti-backlash techniques are available. The present embodiment employs two techniques, an oval gear stud and an open-ended gear shaft seat, to allow lateral movement of individual gears under an applied load, permitting dynamic self-regulating full-tooth gear engagement eliminates approximately 90% of the backlash in a typical gear train.

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Gear Train Backlash Reduction

It is common knowledge that in a gear train, due to tolerances and backlash between the teeth of each mating pair of gears, the output gear lags behind the input gear. This is particularly evident immediately after a change in drive direction when backlash between all gears must be taken up before the output gear moves. In applications where it is important for the output to closely follow the input, several known anti-backlash techniques are available. The present embodiment employs two techniques, an oval gear stud and an open-ended gear shaft seat, to allow lateral movement of individual gears under an applied load, permitting dynamic self-regulating full-tooth gear engagement eliminates approximately 90% of the backlash in a typical gear train. Referring to the figure, it is seen that Input Gear 1 drives Output Gear 2 through Compound Gear 3 and Intermediate Gear 4. Gear Stud 5 is slightly oval in shape, as seen in expanded view 11, permitting Gear 4 a degree of lateral freedom. Output Gear Shaft 6, held within open U-shaped Bracket 7 permitting Gear 2 a degree of lateral freedom, is restrained and positioned by Gear 8 and compression Load Spring 9. Bracket 7 is of sufficient depth that the teeth of Output Gear 2 are brought into tight mesh engagement with the teeth of Intermediate Gear 4, effecting lateral displacement of Gear 4 as permitted by the oval shape of Stud 5. This displacement of Gear 4 results in its tight mesh engag...