Table of Contents
What is the gear wheel?
1. gear wheel – a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion. cogwheel, gear, geared wheel. bevel gear, pinion and crown wheel, pinion and ring gear – gears that mesh at an angle. cog, sprocket – tooth on the rim of gear wheel.
Why are gear wheels used?
component consisting of a toothed wheel attached to a rotating shaft. Gears operate in pairs to transmit and modify rotary motion and torque (turning force) without slip, the teeth of one gear engaging the teeth on a mating gear.
What is meant by surface hardening?
surface hardening, treatment of steel by heat or mechanical means to increase the hardness of the outer surface while the core remains relatively soft. Surface-hardened steel is also valued for its low cost and superior flexibility in manufacturing.
Why it is necessary to toughen the core before hardening the case?
A tough core and a hard case are the desired attributes of case-hardened steel components. This combination of properties provides wear resistance and fatigue strength at the surface, and impact strength in the core. It is achieved by carburizing the component’s surface, then quenching and tempering the part.
Why are gears usually made of hardened steel?
Structural components subjected to high operating stress, such as those within a Falk gearbox, need the high strength of a hardened structure in order to reduce the likelihood of gearbox repairs. Machine components such as gears usually require a hardened structure to resist wear and deformation.
How do wheels work?
Wheels reduce friction. Instead of simply sliding over the ground, the wheels dig in and rotate, turning around sturdy rods called axles. Wheels provide leverage (in other words, they are examples of force multipliers or simple machines).
How is surface hardening done?
surface hardening, treatment of steel by heat or mechanical means to increase the hardness of the outer surface while the core remains relatively soft. The oldest surface-hardening method is carburizing, in which steel is placed at a high temperature for several hours in a carbonaceous environment.
Why do gears have different hardness on the inside and outside?
Since the outside of a gear is cooled faster than the inside, there will beagradient in the hardness. The achievable hardness is based on the amount of carbon in the steeL. The depth of hardness depends on the hardenability of the steel.
What is the hardness of Ia gears?
it is often necessary to increase the hardness of the steel. According to AGMA standards, Ia gear with a hardness of 400 BHN, which has a design life of 10 7 cycles can handle as much as 20\% more load than a gear which is hardened to 300 BHN.
What does hardening a gear case mean?
Wikipedia has a great explanation of case or surface hardening. Surface wear defeats the gear so you make the outer surface hard to resist wear.
What are the gear wheels used in the test rig?
The gear wheels used in the test rig are standard, straight cut gears of module 1. A transmission ratio i = 3 is selected to make sure that always the same teeth are meshing. Although whole number transmissions ratios are usually avoided to assure even meshing conditions, this simplifies the analysis.