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Differential for an electric Go-Kart

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Eduardo Timal

on 9 December 2013

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Transcript of Differential for an electric Go-Kart

Differential for an electric Go-Kart
The general aim is to increase the autonomy of the kart

Gear Calculus
All kinds of gears are highly standardized through the AGMA (American Gear Manufacturers Association) based on this standard we do investigations for the design, materials and manufacturing processes.
The differential is composed by:
2 gears of transmission
4 satellites (internal gears)
2 internal axes
3 external axes

The engine transforms the electrical energy into mechanical energy. This energy is provided to wheels traction through gears and one chain.


Amperage of the engine.
Pressure and adhesion coefficient (wheels).
Charge and condition of the energy source.
We are going to study the force of the traction generated by the synchronization of the wheels traction. This force provokes a loss of energy when the car takes a curve.

Friction (synchronization of the wheels).
Definitions of concepts
Transmission relationship: The ratio between the angular velocities of the pinion and gear.
Charge states and efforts
The magnitudes of the radial and tangential components are determined from the following expressions.
Bearing force.

Once we have the electrical energy as the main source for the Go-kart’s performance, we must pay attention to some aspects of the energy consumption. Such as:
Width between teeth
Thickness between teeth
addendum circle
Dedendum circle
radial Hoolgura
Step circular
Abutment tooth
Face width

Fund between teeth
Pitch circle
Based circle
Base step
All gears must be lubricated to prevent premature failure due to superficial failures.
Benefits of gear lubrication
Removes the heat generated
Separates metal surfaces
Reduces friction
Reduces wear
Features of Elastohydrodynamic
associated with no-concordant surfaces
maximum pressure is between 0.5 and 4 GPa
gears, bearings or rolling elements
Type Lubrication: Elastohydrodynamic
Materials for gear
General Properties
Type of steel: SAE 4140 ACERO
Steel of medium temperance for parts that require substantial hardness, resistance to the traction and tenacity.
It is used in highly demanding parts to build vehicles in general such as transmission gears, asparagus, sprockets and front axles.
Heat treatment and superficial finishing of the steel
 Forge: 1100-850°C
 Anneal of softening : 680-720°C
 Anneal of regeneration: 810-850°C
 Dry out: 426-648°C
 Normalized: 850-900°C
 Steadiness: oil 820-850°C
Full transcript