7.1.2 � � Ͳ � � � � � � � � � Ҫ � �
� � Ͳ � � � � � � � � � Բ � � � � � � Թ � ӯ � � � � � � � � � � � � ܻ � � � � � � � � � � � � � ֧ � � � � � a � � ڿ � � � Ҫ � � � � � � � u � ֧ � � � � � a � � � � � � ˶ � � ᡢ � � � ᡢ � � � � � � � � � � � � � � ϡ � � � Щ � � Ͳ � Ķ � � � � Ե � � � � � ж � lambda � � � � � � غ ɵ � � � � a � � � Ͳ � � � � � � � Ȼ � � ״ � ṹ � � һ � � � � � � � й � ͬ � ص � ͼ � � � Ҫ � � � � ʹ � � � � � � ɶ � � � Ͳ � � � � � � � � � Բ � � � ڿ � � � � � � � � Ҫ � �
� � � �. � � � � � �. � � � � � � � �, gears, gearboxes 1) � ڿ � � � � � Բ � ľ � � � Ҫ � � � � Բ ֱ � � � � � � ͨ � � Ϊ IT5 ~ IT7, � � � � ֲ ڶ � Ra Ϊ 5
~ 0.63
, Ҫ � � ϸ ߵ Ŀ ɴ � 0.04
� � � ڿ � � � Ϊ � � � � � � � ֧ � л � � � � � � Ҫ � � � Quan Ҫ � � � ڿ ׳ ߴ 羫 � � һ � � Ϊ IT6 ~ IT7 � � Ϊ � � ֤ � � � � ĥ � � Ҫ � Ա � � � ֲ ڶ � Ҫ � � ϸ ߣ � Ra = 2.5 ~ 0.16
� � � � � е ľ � � � � � Ͳ � � � � � � � ڿ ׳ ߴ 羫 � � Ҫ � � Ϊ IT4 IT5 ~ � � Ҳ � е � � � Ͳ � � � � � ס � � � � � Ͳ � � � � � � � � � � � � � � Ļ � � � � � � � � ܷ � Ȧ � � � ʶ Գ ߴ 羫 � � Ҫ � � ϵ ͣ � һ � � Ϊ IT8 ~ IT9 � � � � � Ա � � � ֲ ڶ � Ҫ � � ϸ ߣ � Ra һ � � Ϊ 2.5 ~ 1.6
� �
2) � � � � � � ״ � � � � Ҫ � � ͨ � � � � � � Բ � � � ڿ ļ � � � � � ״ � � � ȿ � � � � � ֱ � � � � � � � � � ڼ � � ɣ � � Ծ � � � � � � � � � ʱ � � � � � ڿ � � � � � � 1/2 ~ 1/3 � � � � � � � � � ϡ � � Խ ϳ � � � Ͳ � � Բ � � � � Ҫ � � � � � ⣬ � � Ӧ � п � Բ � � � � Ҫ � � Ϊ � � � � � ĥ � ԣ � � е � � ڿ ױ � � � ֲ ڶ � Ҫ � � Ϊ Ra1.6 ~ 0.1
� � � е ĸ ߴ � Ra0.025
� � � � Ͳ � � � � � � � Բ � � ״ � � � � һ � � Ӧ � � � ⾶ � � � � � ڣ � � � � � ֲ ڶ � Ra Ϊ 3.2
� � 0.4
� �
3) lambda � lay down � � � Ҫ � � lambda � lay down � � � Ҫ � � � � Ҫ Ӧ � � � � � � � � � � � � ڻ � � � � й � � � u Ҫ � � � � � � � � � � � ڿ � � � � ռ ӹ � � � � � � � Ͳ װ � 䣨 � � � � � � � � � � � ȣ � ֮ � � � � � ʱ � � � ɽ � � Ͷ � � � Ͳ � ڡ � � � Բ � � � � � ͬ � � � Ҫ � � � � � � ڿ � � � � ռ ӹ � � � � � װ � � ֮ ǰ � � � � ʱ � � � � ͬ � � � Ҫ � � ϸ ߣ � ͨ � � ͬ � � � Ϊ 0.01 ~ 0.06 mm � � � � Ͳ � � � chuan � � Ե � � � 棩 � � � � � � � � lambda � � � � � � غ ɣ � � Զ � � � � � � � Բ � � � ڿ � � � � � � ߵ Ĵ � ֱ � � Ҫ � � ϸ ߣ � һ � � Ϊ 0.05 ~ 0.02 mm. � �
