皮带轮的英文：
belt pulley
belt roller
sheave

参考例句：

MOTOR PULLEY AND V-BELT
马达皮带轮和V形皮带

Attach the pulley which is held by hand with screws.
用螺丝安装皮带轮的手持部分。

The effective diameter of the motor pulley is obtained by subtracting 5 mm from the outer diameter.
马达皮带轮的有效直径为外径减5mm的数值。

The relationship between the motor pulley/belt length and the sewing speed of the machine is shown in the table.
马达皮带轮、皮带的长度以及缝纫机转速的关系如下表所示

When using a motor of 2P, use the motor pulley, the outer diameter of which is 50mm or less.
使用2P马达时，请使用外径50mm以下的马达皮带轮。

belt是什么意思：
n.
1.腰带，皮带
2.传送带
3.地带，地区
4.【非正式】狠打，猛击
v.
1.[T]【非正式】猛击，狠打
2.[I]【非正式】【英】飞奔，飞驰
3.[T]绕着系上带子

belt and braces
腰带和背带策略

They have a notch in their belt.
他们在自己的地带有个切口。

Hit below the belt
暗箭伤人

pulley是什么意思：
n. 滑轮（组），滑车，皮带轮

The pulley is considered one of the five simple machines.
滑轮被认为是五种简单机械之一。

The engineers worked out the Math and designed a system of nylon ropes and pulleys.
工程师们从数学上进行了论证，并设计出一个由尼龙绳子和滑轮构成的工作系统。

Blend Rational Bézier Fit in Reversing Production of Idler Pulley
导轮逆向生产中的混合有理bézier曲面拟合