Design & Constructionof

A Shaft with a Bevel GearBy

Faisal Bin FarukDepartment of Mechanical Engineering

Khulna University of Engineering & TechnologyKhulna, Bangladesh

Overview› Introduction› Mathematical Problem & Solution› CAD Design› Construction› Constructed Prototype

Shaft is a rotating machine element which transmits power from power producing part to power absorbing part of a machine.

Transmission shaft Counter shafts Line shafts

Machine shaft Crankshaft

Introduction

Bevel Gear - the axes of the two shafts that are 90 degrees apart intersect and the tooth-bearing faces of the gears themselves are conically shaped.

Straight bevel gear Spiral bevel gear Zerol bevel gear Hypoid bevel gear Mitre gear

Introduction(contd)

Math Problem Solution

Problem : A shaft receives 300hp while rotating at 600rpm, through a pair of bevel gears, and it delivers this power via a flexible coupling at the other end. The shaft is designed with the average forces ( at the midpoint of the bevel-gear face); the tangential driving force is F,G = 580lb, Q = 926lb; which are the rectangular components of the total reaction between the teeth; Dm = 24in; L = 36in, a = 10in; Let the material be AISI C1045, cold drawn; N = 2; Considering varying stresses and using the octahedral shear theory, determine the shaft diameter.

Solution:

Math Problem Solution(contd)

Vertical:

Shear Diagram:

Moment Diagram:

Math Problem Solution(contd)

Horizontal: Shear Diagram:

Math Problem Solution(contd)

Assume Kf = 1.0 at B

Octrahedral shear theory:

By trial and error use

D =

Design

Shaft:

Facing Operation: The process of removing metal from the end of a work piece to produce a flat surface

Turning Operation: The removal of metal from the outer diameter of a rotating cylindrical work piece

Chamfering Operation: The two ends of the work piece were chamfered by lathe

All three tasks were done in lathe machine.

Construction

Shaft: Key Slot Cutting: A slot was cut from the end of

smallest diameter of depth 0.30 in. and of width 0.57 in. using shaper machine

Bevel Gear: Turning Operation

Drilling: is a cutting process that uses a drill bit to cut or enlarge a hole

Boring: Drilled holes in bevel gear and pinion is done by boring operation

Milling: Gear teeth on bevel gear and pinion is cut on milling machine

Construction(contd)

Constructed Prototype

Thank You