(1) frame assembly
The frame assembly plays the role of skeleton, connecting the engine, control part and transmission part to form a complete motorcycle, and bears the mass of each part and various external forces when driving. It mainly includes frame, steering rod, front fender, support frame, tripod rod, seat cushion and rear fender, as shown in figure 1-33.
Figure 1-33 Frame components
1 framework. Its function is to act as a skeleton.
② Front and rear fenders. Its function is to prevent muddy water from splashing on passengers and other parts when the vehicle is running, and to keep the driver and body clean.
③ support. Used to support the motorcycle to stand when parking.
④ Foot rest bar. It can be used as a foot pad to relieve the driver's fatigue.
(2) Tailstock
Used for fixing rear turn signals, rear taillights and vehicle license plates, and used for passenger handrails.
(3) Steering mechanism
Used to control the left and right deflection of the front wheel and change the driving direction.
(4) Front fork assembly
It is used to guide the direction of motorcycle, connect the front wheel with the frame elastically, and transfer part of the load of the vehicle to the front wheel to reduce and absorb the impact and vibration transmitted to the front wheel due to uneven road surface. It mainly includes upper and lower connecting plates, front shock absorber assembly, sleeve assembly and other parts, as shown in Figure 1-34.
Fig. 1-34 front fork assembly
(1) upper and lower plates. Used to install the steering column of the front fork and fix the steering handle so that the front fork can swing together by turning the steering handle.
② Front shock absorber. The front wheel is elastically connected with the frame to absorb and reduce the impact or vibration caused by uneven road surface and ensure the comfort of drivers.
(5) Rear suspension assembly
When the wheels bump when driving on uneven roads, the rear wheels can move upward together with the rear suspension bracket and the rear transmission, which plays a buffering role and reduces vibration. The rear suspension assembly includes upper and lower chain shell assemblies, rear rocker arm welding assembly and rear shock absorber assembly, as shown in figure 1-35.
Fig. 1-35 rear suspension assembly
① Combination of upper and lower chain shells. Its function is to prevent sediment from entering sprocket and chain and prolong its service life.
② Welding combination of rear bracket. Its function is to connect the frame with the shock absorber, fix the upper and lower chain shells, and make the rear wheel move with the suspension, thus playing a buffering role.
③ Rear shock absorber combination. The rear wheel is elastically connected with the frame, which plays a buffering role and is used to reduce and absorb the impact and vibration transmitted to the rear wheel due to uneven road surface, thus improving comfort and safety.
(6) Front and rear wheel assemblies
The front and rear wheel assemblies include a front wheel assembly (front wheel) and a rear wheel assembly (rear wheel). The front wheel is a guide wheel, which cooperates with the steering part to determine the driving direction; The rear wheel is the driving wheel, which receives the power transmitted by the engine and drives the vehicle forward.
The wheel assembly is mainly composed of wheels and tires, as shown in figure 1-36. They * * * complete the task of supporting the whole quality of motorcycles and driving on the road. A wheel is a rotating component that bears the load between a tire and an axle, and is mainly composed of a rim, spokes and a hub. In order not to cause misunderstanding, wheel assembly is usually referred to as wheel for short.
Figure 1-36 Wheel assembly