The information about the "back rocker" is basically here.

The rear wheel can be separated from the car body. The rear wheel and the frame are connected to the main rear rocker. The rear rocker is also divided into many types like the frame. The advantages and disadvantages of each rear rocker are also different. .

Working diagram

The front part of the rear rocker arm is fixed at the rear of the frame, the rear part is fixed to the rear wheel, and the middle part is fixed with shock absorption. It is not the screwing of the two iron rods on the frame, it is necessary to consider the weight control before and after. After the rocker arm rigidity, the wheelbase type of parameters, the vehicle must be able to withstand the force of the rear wheel, and then transmit this force to the frame, pushing the whole car forward, and the rear wheel should be subjected to the brakes. Drag and drop, absorb excess force when turning.

In the early stage of the motorcycle, the rocker did not consider shock absorption, but added a spring under the seat to protect the buttocks.

So slowly evolved:

1. Round tube rear rocker

Over time, the clever designers found that fixing the shock absorber to the rocker arm can improve the adhesion of the rear wheel to the road surface, and can also better filter the bumps caused by the road surface.

However, the shortcomings of the rocker behind the round tube are not small. Due to the strength of the frame, the shock absorption must be very close to the axle, reducing the force on the rocker behind the round tube. Therefore, it is equipped with double-tube damping, but equipped with double-tube damping. The restriction on the rocker arm of the round tube is further increased, and the upper part of the shock absorber is fixed on the tailstock, and the force of the entire frame becomes uneven. If the two shock absorption performances are different, it will cause The wheels are tilted left and right.

Nowadays, there are very few applications of the rocker arm after the round tube. After all, the strength is not strong, and the disadvantage is greater than the advantage. It can only be seen on the retro car and the modified Cafe.

2.1 square tube rear rocker

The rear rocker arm of the square tube is an upgraded version of the rocker arm behind the round tube. The shape is changed to a rectangular shape. It is usually used for cars with a small weight. It can be used for central shock absorption. The central damping is good, the stroke is short, and the core diameter is large. It can be installed vertically and has a long life. Because there is only one shock absorption, there is no left and right tilting of the rear wheel caused by uneven left and right elastic forces. However, the lateral pulling force of the rocker arm after the square tube is still weak, and the weight is relatively large. The car still uses double-tube shock absorption.

It should be mentioned here that the square tube frame is mostly made of aluminum alloy material. The first phase introduces you to the advantages of aluminum alloy. Light, this advantage is great, but most of the domestic models still use steel, of course, import There are also models.

2.2 Reinforced square tube rear rocker

After strengthening the square tube rear rocker arm, the reinforcing beam is welded on the rocker arm of the square tube to form a triangle, so that it can withstand more force. This time, the heavier model can also use the single tube shock absorption. At the same time, the lateral pulling force is strengthened.

3. Upper triangle rear rocker

After the upper triangular rocker arm, after the reinforced square tube, the rocker arm is upgraded and made into one body, the unused part of the middle is buckled to reduce the weight, but since the upper triangle takes up the upper space, the space of the chain is occupied. So, only the upper beam can be thinned, the upper beam becomes thinner, and the metal resistance is still not satisfactory.

4. Lower triangle rear rocker

At this time, the designer's clever brains began to play again. Can you not touch the chain if you put the triangle upside down?

In this way.... After the lower triangle, the rocker arm was born, and the upper beam was solved. In order to avoid the chain, the rocker was thinned. However, the rocker arm of the lower triangle was not without defects. To raise the height, so the position of the vehicle, the force situation must be compromised.

5. Gull wing rear rocker

In the past few years, the rear rocker arm used in most performance cars is not very similar in shape to the flying seagull wings. The rear wing arm strength of the gull wing exceeds the upper triangle rear rocker arm, but weaker than the lower triangle rear rocker arm, but the rear rocker The installation position of the middle shaft of the arm does not need to be raised. Although the rear rocker arm of the single gull wing is slightly worse than the rocker arm of the lower triangle, it can be integrated with the performance of the whole vehicle, and the rear rocker arm of the gull wing is stronger than the rocker arm of the lower triangle.

6. Single rocker arm

The single rocker arm is like its name. There is only one, which gives a very large visual impact. Many people will like the single rocker arm of the arrogance. It is very technical, but the industry is not the same with a single rocker.

Advantages: Some people say that it is more flexible to bend, only one side is light, and it is faster to change tires (in fact, this is more chicken, not F1)

Disadvantages: expensive construction, inconvenient maintenance. Even the BMW S1000R uses a double rocker arm, but since the big water bird 1200GS uses a shaft drive, the rear wheel can be directly fixed to the drive housing, and there is no need to add a rocker arm to increase the weight.

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