L : Chain length
6-9. Shaft Center Distance ?The shaft center distance C is calculated using the following formula.
C = 1/8[2L - L - n + √[(2L-N-n)2-0.811(N-n)2]
6-10. Chain speed and Calculation of load on chain a. Chain speed
V = P x N x n/1000 (m/min) V : chain speed (m/min) P : chain pitch (mm)
N : number of teeth in sprocket?n : rpm of sprocket
b. Load on chain?P = 102kw/V (kg) P : load on chain (kg) V : chain speed (m/min)
6-11. Installation and Arrangement of Chain?When designing the wrapping transmission drive, the center line of both sprockets should be close to horizontal. The vertical drive arrangement is not recommended because the chain is apt to be derailed from the sprocket even in case of minimal elongation. Also the angle of inclination should be up to 60°, if it is possible. And a minimum center distance should be sufficient to give clearance between the teeth of the two sprockets. In general, the center distance of the sprockets should be 30 to 50 times ch
ain pitch. But the center distance of the sprockets should be less than 20 times the chain pitch, when the chain is subjected to fluctuating load,
6-12. Prevention of Chain Vibration?If a vibration takes place due to transmission condition, in this case, you should install 'Guide Stopper' to prevent vibration.
6-13. The amount of Chain Sag?The slack should be on the lower side.
In general the amount of chain sag (S-S') is generally 4% of the span but the sag should be 2% of the span for the following applications: - Heavy load and frequent starts
-The center line of sprockets is vertical or almost vertical?-Shaft center distance is more than one meter
-Travel direction of chain is often reversed
6-14. 枢轴和链轮的矫正?安装完链轮并使两个链轮在同一平面上,之后,两个枢轴要求相同且要在同一水平线上。
7. 润滑
7-1.链条的润滑 ?滚子链是由一系列的部件组合而成的,所以需要适当的润滑来使其达到最大的寿
命。 ?例如伸长时磨损得表现,它是由销轴和套筒间的摩擦导致的。
如果如下图这样,链条的寿命将明显延长,因为油膜可以避免链条部件间的直接接触。同时,润滑油起到冷却、消除噪音和高速运转时对部件间碰撞的缓冲作用。
7-2. 润滑油的选择?润滑油根据温度范围有不同的选择,如下图。(粘稠润滑油和油脂不适用于滚子链)
温度( ?c ) -10℃ ~ 0℃ 0℃ ~ 40℃ 40℃ ~ 50℃ 50℃ ~ 60℃ 粘性 SAE 20 SAE 30 SAE 40 SAE 50
7-3. 润滑的方式?有三种滚子链润滑的方法。严格按照推荐的润滑方式执行会使链条达到最长的寿命。润滑的方式是根据链条的速度和传动力来区分的。
润滑的方润滑方法 式 - 每8小时或在必要的时候润滑一次,防止轴承变干燥。 - 为防止受伤,请不要尝试用手给链条润滑;润I 润滑指南: 用油壶或毛刷将油涂在链条松弛的一侧。 A - 每分钟5~20滴或足够防止链条过热。 - 速度变化了应该增加润滑剂量;润滑时链条II 要慢速:一般不油滴润滑: 用油壶点滴润滑链条。 - 油的深度应为6~12mm;油平面应能使链条完全淹没。 - 此种润滑方法适用于速度约在450米/分的链条;为防止链条B I 过热,仅使一段链条通过润滑油中。 高于200米/分。 滑时链条要慢速:一般不高于200米/分。 润滑量和方法 注意 润滑: 将链条置于油槽