TAILIEUCHUNG - Machinery's Handbook 27th Episode 3 Part 7

Tham khảo tài liệu 'machinery's handbook 27th episode 3 part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Machinery s Handbook 27th Edition INTERNAL GEARING 2075 Rules for Internal Gears 20-degree Full-Depth Teeth To Find Rule Pitch Diameter Rule To find the pitch diameter of an internal gear divide the number of internal gear teeth by the diametral pitch. The pitch diameter of the mating pinion also equals the number of pinion teeth divided by the diametral pitch the same as for external spur gears. Internal Diameter Enlarged to Avoid Interference Rule 1 For internal gears to mesh with pinions having 16 teeth or more subtract from the number of teeth and divide the remainder by the diametral pitch. Example An internal gear has 72 teeth of 6 diametral pitch and the mating pinion has 18 teeth then Internal diameter 72 - inches 6 Rule 2 If circular pitch is used subtract from the number of internal gear teeth multiply the remainder by the circular pitch and divide the product by . Internal Diameter Based upon Spur Gear Reversed Rule If the internal gear is to be designed to conform to a spur gear turned outside in subtract 2 from the number of teeth and divide the remainder by the diametral pitch to find the internal diameter. Example Same as Example above. 72 2 _ -I-I z-z-z- Internal diameter - - inches 6 Outside Diameter of Pinion for Internal Gear Note If the internal gearing is to be proportioned like standard spur gearing use the rule or formula previously given for spur gears in determining the outside diameter. The rule and formula following apply to a pinion that is enlarged and intended to mesh with an internal gear enlarged as determined by the preceding Rules 1 and 2 above. Rule For pinions having 16 teeth or more add to the number of pinion teeth and divide by the diametral pitch. Example 1 A pinion for driving an internal gear is to have 18 teeth full depth of 6 diametral pitch then Outside diameter 18 inches 6 By using the rule for external spur gears the outside diameter inches. Center Distance Rule .

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