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Snap-on Gear Design to Prevent Over-push On

IP.com Disclosure Number: IPCOM000060078D
Original Publication Date: 1986-Feb-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Kroeker, EB: AUTHOR [+2]

Abstract

The snap-on gear (pulley) shown in Fig. 1 has an internal ring 1 in the I.D. This ring is so designed in width thickness to be pressed over the shaft diameter 2 to a groove 3 on the shaft. The gear is then retained on the shaft and is free to rotate. For robot assembly (or manual), extra control is required to not over-push the gear past the groove onto the shaft. To improve this assembly problem, the diameter of the shaft 4 before the groove 2 is reduced in size, as shown in Fig. 2, and the same amount of reduction is added to the I.D. of the internal ring 5, as shown in Fig. 2. The robot pushes the gear on with enough force to ensure gear snap-on under worst conditions without the gear being pushed too far. The added material to the ring I.D. 5 will not pass the groove without excessive force.

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Snap-on Gear Design to Prevent Over-push On

The snap-on gear (pulley) shown in Fig. 1 has an internal ring 1 in the I.D. This ring is so designed in width thickness to be pressed over the shaft diameter 2 to a groove 3 on the shaft. The gear is then retained on the shaft and is free to rotate. For robot assembly (or manual), extra control is required to not over-push the gear past the groove onto the shaft. To improve this assembly problem, the diameter of the shaft 4 before the groove 2 is reduced in size, as shown in Fig. 2, and the same amount of reduction is added to the I.D. of the internal ring 5, as shown in Fig. 2. The robot pushes the gear on with enough force to ensure gear snap-on under worst conditions without the gear being pushed too far. The added material to the ring I.D. 5 will not pass the groove without excessive force. The second benefit from the arrangement of Fig. 2 is that deeper or longer cross- sectional length of the snap ring permits more flexing of the ring material with less distortion and a better snap action. This also prevents the gear from being pushed on too far with machine handling or by both line and service personnel.

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