belt drives Flashcards
V belts transmit power by a ___ action between the belt and the sheve and ___ in the belt?
wedging action
tension in the belt
The advantages of v-belts.?
cost effective
no lubrication
slip on overload
they require 120 deg arc of contact
limitations of v belts ?
120 deg of arc contact
unsuitable for high temp
not practice for high surface speeds
what are tensile members and compression material and the cover?
tensile members consists of cords that cary the load
compression material transmits power between the sheave
cover protects the internal parts
the pitch line or tensile section of the belt is located near the ?
outside diameter of the sheave
what is creep?
the loss of driving speed due to the lengthening and shortening of the belt as it cycles from the slack side to tight side
the amount of power that a belt can transmit depends on?
the strength of the tensile members
-the grip on the pulley
-arc of contact
-the tension applied to the belt.
-coefficient of friction between belt and pulley
The gripping action on a Vbelt, depends on the wedging action of the belt, and sheave if the belt rides in the bottom of the sheave you will have less?
wedging and more slippage
what is friction?
the grip of the belt and pulley
the coefficient of friction depends on ?
the nature of surfaces in contact
the arc of contact is the ?
number of of degrees that a belt wraps around a pulley
greater the arc for surface to grip
