What is a Drive Pulley?
time2022/08/12
- This AK17 Pulley 5/8" bore is directly interchangeable with other manufacturers, is 1.75" in diameter, is used with A style V-Belts.
What is a Drive pulley?
You know the thing you're holding is a v-groove drive pulley because that's what your owner manual says. But what is a drive pulley, anyway?
A drive pulley is a pulley that is attached to a power source, that when in use puts force on a belt (or cable or chain). The belt is connected to the object being driven, which will then spin. This is a type of power transmission.
All by themselves, they won't give you the drive to wake up early and use your snowblower and clear the driveway, but used with other components, they'll sure make the job easier!
Drive pulleys can be made of any hard/sturdy material - diecast, steel, and cast iron are the most popular choices.
All drive pulleys must have two components:
A round disk, often with the groove(s) around the circumference. This is the area where a belt or rope will ride. The belt will transfer the power to another pulley in the system.
A way to attach the pulley to a shaft in such a way that the pulley will turn at the same rate as the shaft. This is frequently accomplished with an attached hub, which projects out from the center and often has a keyway and/or set screws.
Here are some helpful definitions:
Frontside Offset: The width from the center of the product to the front edge of the hub, bearing, or bore adapter.
Groove Angle: The angle of the v-groove. This is largely governed by the diameter of the pulley but can affect how deep in the groove your belt will ride.
Inside Diameter: The distance across the center hole, or bore, of the product. This dimension should match the diameter of your shaft or bolt.
Keyway: The width of the key used to anchor the pulley to a shaft. A negative keyway means this has an integral keyway, so no separate key will be needed to anchor the pulley.
Outside Diameter: The distance across the circle of the product, from outside edge to outside edge.
Overpin Diameter: An engineering dimension used to represent belt effective diameter. Cylinders or "pins" are placed at the top and bottom of the pulley's v-groove, the measurement is taken from the top of the upper pin to the bottom of the lower pin.
Pin Diameter: Diameter of the cylinder used to determine the belt with the best fit in v-belt drive and idler pulleys. Other belts may work with the pulley, but the fit into the v-groove will be different.
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