1
What is?
refers to an engine drive mode and the number of the layout position of the drive wheel, the drive wheel from the number divided into four wheel drive and two-wheel drive.
2
common drive form
of FF (FF), front rear drive (FR), front wheel drive, rear center drive (the MR), the center four-wheel drive, the rear drive (RR), the rear-wheel-drive
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3
pre-precursor
of FF (front-engine front-wheel drive referred to as FF) before the front-engine front axle means by two front-wheel drive cars drive the whole way. Most cars are driven to use this form, but large trucks and specialized off-road vehicles basically do not use this form.
Advantages:
· Compact, reducing vehicle weight, high power transmission efficiency, thereby improving fuel economy.
· eliminating the axle assembly, rear floor no high projection, riding quality is improved.
– a front-engine front axle load can be increased, it is advantageous for high-speed driving direction of the vehicle and braking stability.
*When driving on a snowy or slippery road, the vehicle body by pulling the front wheel, with respect to the drive direction will help to ensure stability.
· luggage compartment arranged in the rear of the vehicle, more conducive to the flexible use of space.
Disadvantages:
– start time of acceleration or climbing, due to inertia, the front wheel load is reduced, leading to a certain extent traction decline.
4
rear-drive
rear-drive (front engine rear-drive, referred to as FR) before the front-engine front axle means, a rear wheel drive mode two whole vehicle drive.
You know what?
rear-drive is the most fun to drive drive form, can be a good turn reduce the shortage, etc., increased handling, most sports cars, racing to use this form. When
advantages
– start on a good road surface, acceleration or climbing, the drive wheel load increases, its traction performance than pre-precursor superior.
-uniform weight distribution, which has a good ride comfort and handling stability, and help extend the life of the tire.
drawbacks
* Due shaft means reduces the transmission efficiency, fuel economy impact to some extent.
• Since the central rear floor raised high, affecting the ride comfort.
• When snow or slippery road start, rear-wheel driven vehicle, prone to drift phenomenon.
5
Pre-wheel-drive
Front-wheel-drive (Front-engine, Four-wheel drive layout, abbreviated F4) before the front-engine front axle by four-wheel drive cars the whole way. Part of the sports cars and off-road vehicles are using this form.
advantage
· Since the four have power, with a higher handling and passing ability.
shortcomings
· traditional institutions is more complex, reducing the transmission efficiency, fuel economy affected to some extent.
6 after
in opposite drive after
the center drive (Middle-engine Rear -drive, referred to as the MR), the engine is placed between the front and rear axles, the two rear wheel drive cars whole way.
advantages
· best available small axle load distribution, the weight concentration, the direction of the vehicle body yaw moment of inertia, better steering stability.
near the engine-drive axle, the transmission shaft without the need to reduce vehicle weight, having a high transmission efficiency.
drawbacks
· arrangement occupies a portion of space in the engine compartment and the luggage compartment, the seat 2 is generally mounted only the vehicle compartment.
· engine sound and heat insulating effect of the differential, reduced comfort.
7
is set in the four-wheel
i.e., the engine is placed in between the opposed front and rear wheel drive shaft, driven by the four integer cars manner. Like the rear mid-engine, high-performance sports cars are used in this form. But after the mid compared to flooding, mid-wheel-drive handling and cornering limit to be stronger.
8
After the rear drive after
after the rear-wheel drive (rear-engine rear-drive, referred to as RR) rear axle placed in the engine, rear wheel drive two-way whole vehicle. Is the large and medium-sized passenger cars popular arrangement, the current use of the rear-wheel drive passenger cars such as: the Porsche 911 series and Smart.
9
the rear-wheel-drive
Post four i.e., the engine is placed after the rear axle drive, four-wheel drive by the whole vehicle in a manner currently used as rear-wheel drive passenger car: PORSCHE 911 Carrera 4 / 4S.