Automobile Engineering

Classification of Chassis PDF: Rear Wheel Drive (RWD), Front Wheel Drive (FWD)

Classification of Chassis PDF: Rear Wheel Drive (RWD), Front Wheel Drive (FWD): In the last article, we had discussed about Classification of IC Engines in a detailed way along with its Components, Nomenclature, Cooling Systems, Performance Parameters and Lubrication of IC Engines.

In todays class, we will be discussing the Classification of Chasis based on fitting of engine, No. of wheels fitted in the vehicle & No. of driving wheels and also on type of drive(Front Wheel Drive, Rear Wheel Drive and All wheel Drive).

Note: Download Classification of Chassis PDF at the end of the article.

Classification of Chassis PDF Rear Wheel Drive (RWD), Front Wheel Drive (FWD)
Classification of Chassis PDF Rear Wheel Drive (RWD), Front Wheel Drive (FWD)

Let’s discuss in detail…

Classification of Chassis:

The classification of chasis is based on 

  1. According to the fitting of engine
  2. According to No. of wheels fitted & No. of driving wheels
  3. According to the Drive

The explanation is as follows…

I. According to the fitting of engine:
(a)Full Forward
(b)Semi Forward
(c)Bus Chassis
(d)Engine at back
(e)Engine at centre

(a) Full Forward:

Types of Chasis – Full Forward

Location of Engine : Outside the driver cabin

Ex:Cars, Mahindra Jeeps etc.

(b) Semi Forward:

Types of Chasis – Semi-Forward

Ex:TATA SE Series of Vehicles

(c) Bus Chassis:

Types of Chasis -Bus Chassis

Location of Engine : Totally in the drivers cabin

Ex:Buses, Trucks etc.

(d) Engine at back:

Types of Chasis – Engine at back

Location of Engine : At the back portion of chasis

Ex: Leyland Buses (Volvo Bus)

(e) Engine at centre:

Types of Chasis – Engine at Center

Location of Engine : Center of the chasis

Ex: Top Speed cars- Porsche, Renault Alpine etc.

2.According to No. of wheels fitted & No. of driving wheels:

classification of chasis
classification of chasis

3.According to Drive:

  • Rear Wheel Drive
  • Front Wheel Drive
  • All Wheel Drive
  • Left hand Drive
  • Right hand Drive

Rear Wheel Drive (RWD):

Engine Power is transmitted to the rear wheels via the gear box, propeller shaft, differential and axles whereas the Front wheels are used for providing the direction for the motion of the vehicle.

Traditionally, Vehicles are of Rear wheel drive only and now it is moving towards Front Wheel Drive.

Advantages of Rear Wheel Drive:

  • Mileage: In general, Rear-Wheel drive vehicle gets less mileage than FWD.
  • Complexity: It is less complex than FWD
  • Ruggedness:Much higher than FWD.
  • Handling:RWD is better because the front wheels are just to turn the vehicle whereas the power will be given only to the Rear wheels
  • Vehicles:Toyota Fortuner, Toyota Innova, Mahindra Scorpio, Mahindra XUV 500, Mahindra Xylo, Mahindra Quanto, Mahindra Bolero.

Front wheel drive (FWD):

Engine Power is transmitted to the front axle near the engine.

It means the front wheels are being powered by the engine, and the rear wheels just follow the front wheels.

Propeller shaft is eliminated and the linkage for clutch and transmission is simplified. This permits a low chassis height.

Better road adhesion is obtained in the case of Front-wheel drive where a large part of the weight of the automobile is taken on the driving wheels.

Engine pulls the car rather than pushing.

Vehicles: Alto,I 20, Baleno, Celerio, Brezza etc.

Advantages of Front Wheel Drive:

  • The engine and transmission are located directly above the front wheels, which can provide better traction when climbing hills and driving on slippery roads
  • Mileage: Front-wheel drive has less components than any other drive and it makes the vehicle lighter and thus increase in mileage
  • Complexity: It (Entire setup of Transmission) is more complex than RWD.
  • Ruggedness:less than RWD.
    It is a simpler system and tends to be less expensive to buy and maintain.

Dis-Advantages of Front Wheel Drive:

  • Front-wheel drive cars tends to understeer because all the weight of transmission system is located in the front of the vehicle, .
  • Front-wheel drive can make handling more difficult because all the weight is up front on the front wheels.

Characteristics of Good Chassis:
It should have

  • high Strength
  • Durability
  • Easy of Control
  • Economy of Operation
  • Stability
  • Simplicity of Lubrication
  • Fast Pickup and Safety

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