Expanding Pulley Mechanism (FINAL INDEPENDENT PROJECT)

Aim :- Expanding Pulley mechanism

Software Used :- Solidworks 2019

Objective :- To create a cad model, animation and motion analysis of the expanding pulley mechanism using solidworks.

Parts to be modeled :-

• Base
• Central gear
• Pulley Segment
• Pinion

Theory :- In an expansion-pulley composed of a series of rim-segments having each an arm radially arranged for sliding upon a suitable support and being provided with an antifriction-roller suitably mounted for revolution, a device for expanding and contracting the diameter of said pulley, consisting of a body adapted to be slidingly mounted upon the same shaft as said pulley, and having a series of arms, one for each pulley-arm, ar ranged parallel with said shaft and having their outer edges formed of alternately-arranged horizontal and inclined spaces adapted to engage corresponding spaces upon the pulley-arms and to expand the diameter of said pulley when said sliding arms are moved in one direction, said sliding arms being also provided with spaces alternately arranged and adapted to be engaged by the aforesaid roller and to thereby contract the diameter of said pulley when said sliding arms are moved in the reverse direction, substantially as described.

Components :-The following are the components that are required for expanding pulley mechanism

Base : The base is the component of expanding pulley mechanism where all the other components of the assembly are placed with respect to its position. The following component is created according to the dimensions.

Central Gear: A gear is a rotating machine part having cut teeth or, in the case of a cogwheel, inserted teeth (called cogs), which mesh with another toothed part to transmit torque.The following component is created according to the dimensions.

Pinion :Generally, when meshing pair of gears, the smaller gear is called a pinion gear. Also, it refers to the cylindrical gear that meshes with a rack in a rack-and-pinion mechanism which transforms rotational motion to linear motion.The following component is created according to the dimensions.

Pulley segment : If a pulley is divided into n number of parts. Then that specific part of pulle is known as pulley segment. The following component is created according to the dimensions.

Assembly :- Assemble the following components of the assembly by using mates. First coincide the pulley segment and the base of the assembly. Give concentric mate to the central gear with the base. Now by using circular pattern assemble the other four pulley segment with base. Give mechanical gear mates to the pinion and central gear of the assembly.

Motion analysis :- Place a oscillating motor on the central gear of assembly. With the value of `92.5^o` and `0.125 hz`. Now give contact to the components of the assembly.

Plots :-The following is the plot of the pulley segment that moves upwards and downwards according to the movement of central gear

Google Drive Link : Expanding Pulley Mechanism File

Animated Video :