国际标准化组织已公布了ISO10823-1996链转动选择指导标准。标准规定考虑链条实际传递功率时，应对输入功率进行修正。

实际传递功率=输入功率×工况系数×排数系数

The international organization for standard had issuedthe ISO10823-1996 standard of Guidance on the selection of roller chain

drives, if you try to calculate the input power You must consider to revise it according to the following formal

Actual power=input power × service factor × strand factor

工况系数表 Service factor table

世界各国历史悠久的链条工厂都制订有自己的链传动功率曲线和率表。我国虽未建立自己的功率曲线，但可参照ISO1083-1996标

准的功率曲线，选择链条传动率或由传动功率选择链条，前提是已知小链轮齿链和转链。

现以工家十二型手扶拖拉机传动部分和旋耕部分的传递功率，验算链条选择是否合理。

1、  传动部分

小链轮转速nl=135转/分   小链轮齿数zl=14   输入功率=10.944马力=8.16千瓦

由B系列滚子链功率曲线得知,选择08B-2滚子链是合适的.

2、  旋耕部分

小链轮齿转速n1=199转/分   小链轮齿数z1=13  输入功率=9.888马力=7.37千瓦

由A系列滚子链功率曲线得知，迁择12A滚子链是不合适的，选型偏小，正确选用应采用16A-1

滚子链或加强型滚子链12H-2滚子链。

The chain factories with ling history in the world have their own chain transmission power rating raph and powertable. Though our

country haven’t created our own power rating graph, We can refer to the ISO 10823-1996 standare selecting the drive power or selecting

chain according ro the drive power, The condition si that we should know the number of the small sprocket’s teeth and its revolution.

Now we use the transmission part in walking tractor and the transmission power in ratary tillage to proofwhether the chain selection is correct.

1.       Chain drive part.

Small sprocket rpm nl=1351 Tooth number of small sprocket Z1=14 Input power=10.988HP=8.16W

2.       Ratary tillage chain part

Small sprocet rpm n=199 Tooth number of small sprocket Z1=13 Input power=9.888HP=7.37W

Form A series horsepower rating graph, You’ll find that selected 12A-2 roller chain is unsuitable, You should choose 16A-1 or 12AH-2

roller chain instead of 12A-2.