Motorcycle backbone, common frame type popular science!

The frame, literally understood, is the frame of a car, which constructs the outline of the entire car and integrates the engine, gearbox, battery, shock absorber, seat, etc. In addition, the frame has to bear the weight of the rider, the influence of inertia during acceleration and deceleration, and the deformation when cornering. In the development history of more than one hundred years of motorcycle, the type and nature of the frame are constantly changing.

Structure type of frame
At the beginning of the motorcycle only put the internal combustion engine on the bicycle, and the prototype of the bicycle as the motorcycle frame did not seem to have much trouble. However, after the study of the past, the support form of the bicycle can not meet the requirements of the motorcycle, so a variety of frame forms have been developed.

body frame
At the beginning of the scooter type, the frame is only a car shell, strictly speaking, there is no frame, so the car body is easy to be damaged, rust poses a threat to the rigidity of the car body, and the ability to resist torsion and energy is also very weak. It makes little contribution to handling and driving safety, but is a synthetic product of affordable cost and low-tech applications. Thus was born the following to say the backbone of the frame.

spine frame
This kind of frame is equivalent to an enhanced version of a bicycle frame. From the front steering column of the vehicle to the rear shock support, there is a main beam made of steel pipe. The engine and other components are installed on the lower part of the main beam, which seems to be a human spine. Form, so it is called a spine frame.

The spine frame is subdivided into two types. One is to directly hang the engine and other components under the main beam, which is called the spine frame, and the other type is between the front steering column and the seat. The frame is bent downward to form a space for getting on and off the car and storing items. This is also the type of frame used by common curved beam vehicles.

cradle frame
The cradle frame belongs to the deformation of the spine frame. Simply put, an engine load-bearing platform is added to the spine frame, which allows the engine to "lie" in the arms of the frame.

Compared with the simple spine frame, the cradle frame has greater strength and rigidity, and has better stability in frequent acceleration and braking.
The cradle frame is also subdivided into two types. One is a single cradle that uses a steel beam to connect the engine support part; the other is a double cradle that uses two steel beams to strengthen the rigidity of the engine bracket.

span frame
The straddle frame is an advanced version of the spine frame. It uses the rigidity of the engine itself and is directly connected to the frame through the anchor points on the engine to act as a part of the frame and assume some supporting effects. This year's popular model: Ninja 400 uses the bridge frame technology derived from H2R.

Diamond Frame
With the performance of motorcycles becoming more and more powerful and the power becoming more and more intense, the traditional cradle frame is somewhat weak in lateral support when cornering at high speed and turning at a continuous large angle. In view of this demand, the frame with enhanced side strength came into being.

Because the overall shape is like a cut diamond, this kind of frame is called a diamond frame. Compared with a cradle frame, the diamond frame has stronger lateral support and is more common in sports vehicles.