China Motorcycles Suppliers,Electric Bikes and Agricultural Appliances Manufacturers

1. Complete motorcycle inspection of motorcycles

First of all, the appearance inspection, the parts of the motorcycle should be intact, there is no missing parts, the paint layer, chrome plating, galvanized parts should be bright and shiny, without scratching and falling off. motorcycles should have product certification, product instruction manual, and pick-up spare parts and tools according to the packing list. Then start the inspection. At normal temperature, the cold start is not more than three times, and the hot motorcycle should be started once. There should be no abnormality and knocking sound when the engine is running, the idle speed is stable, and there is no leakage of gasoline or oil.

2. Inspection and adjustment of components

(1) Front wheel brake. The front wheel brake is operated by the right hand and the free travel is first checked. The free-travel stroke refers to the stroke from the start of the handle to the start of the brake. Before the stroke is too small, the brake shoe block and the front wheel brake drum cannot be completely disengaged, which affects the driving speed; if the stroke is too large, the braking efficiency cannot be braked in time.

(2) Rear wheel brake. The rear wheel brake is operated by the pedal. First, check the free travel of the brake pedal.

(3) Clutch. The clutch is normally operated by the left hand and its free travel is checked during adjustment.

(4) Rear shock absorber.

(5) Rear drive. The rear drive adjustment is mainly to check the tightness of the transmission chain (drive belt). The inspection position is in the middle position between the front and rear sprocket (pulley). Use the finger to move the chain up and down to see the distance between the upper and lower movements. The scooter is 10~ 20 mm, ordinary motorcycles are 20 to 30 mm. Triangular drive belt tightness, press by hand [press with 49 Newton (5 kg force)] belt, the belt droops 10 to 20 mm.

(6) motorcycleburetor idle speed. Idle speed is the lowest steady speed when the engine is unloaded. When the throttle handle is placed in the minimum position, the engine can keep running continuously. When adjusting, first start the engine, gradually turn the throttle handle, check the free stroke of the throttle handle, generally set to 2 ~ 6 mm, if the rotation does not exceed 2 mm, the engine speed will rise, indicating that the free travel is too small; If the stroke exceeds 6 mm and the engine speed does not increase, the free travel is too large.

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(1) Steering: The front wheel and the handlebar cooperate to control the driving direction of the motorcycle. The handlebar is mounted on the upper plate. When the handlebar rotates around the direction column, the upper and lower plates are rotated, and the front wheel is rotated by the front shock absorber. The right end of the handlebar is equipped with a throttle handle for controlling the opening of the carburetor throttle valve and a brake lever for controlling the front wheel brake; the left end is provided with a grip and a handle for controlling the clutch. Rear view mirrors and various electrical switches are also mounted on the left and right ends of the handlebars. The handlebars and brake levers control the front wheel brakes, clutches and carburetor through the cable. The cable has different specifications. The brake and clutch are 1×19 outer diameter ∮2～∮2.5mm single-strand steel wire rope. The carburetor uses 1×7 outer diameter ∮1.2～∮1.5mm single-strand steel wire rope.

(2) Braking: Generally, the front wheel brake is controlled by the hand brake lever, and the rear wheel brake is completed by the foot brake pedal. Motorcycle brakes are available in both mechanical drum brakes and hydraulic disc brakes. The structure of the drum brake is similar to that of a car or a tractor. The brake shoe is die-casted from aluminum alloy with a friction brake pad attached thereto. The brake cam is rotated by the brake arm and the brake shoe is pushed open to brake.

The brake consists of a fuel tank, a plunger valve oil pump (both on the handlebar), a hydraulic oil pipe, a brake caliper, and a brake disc. The brake misalignment is fixed together with the front fork guide and is a fixed part of the brake device. The brake disc is fixed to the wheel and rotates with the wheel. When braking, hold the brake lever and move the plunger valve to push the hydraulic oil along the hydraulic oil pipe into the two cylinders of the brake caliper. Under the action of the pressure oil, the cylinder pushes the friction plate to clamp the brake disc from both sides, generating a large frictional resistance, forcing the wheel to stop rotating. When the brake is released, the pressure in the hydraulic circuit quickly drops back, and the cylinder drives the friction plate to return to the original position to release the brake.

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The front fork is a guiding mechanism of the motorcycle, and the frame is organically connected with the front wheel. The front fork is composed of a front shock absorber, an upper and lower connecting plate, a direction column and the like. The direction column is welded with the lower joint plate, and the direction column is set in the front casing of the frame. In order to make the direction column motorcycle move flexible, an axial thrust ball bearing is arranged at the upper and lower shaft neck positions, and the left and right sides are connected through the upper and lower plates. The front shock absorbers are joined together into a front fork.

Front and rear shock absorbers: The front shock absorber is used to attenuate the vibration caused by the impact load of the front wheel and keep the motorcycle running smoothly.

The rear shock absorber and the rear rocker arm of the frame constitute the rear suspension of the motorcycle. The rear suspension device is an elastic connecting device between the frame and the rear wheel, which bears the load of the motorcycle, reduces and absorbs the shock and vibration transmitted to the rear turn due to the uneven road surface.

Wheels: The front wheels of motorcycles are guide wheels, and the rear wheels are drive wheels, all of which are spoke wheels. The wheels are composed of tires (inner and outer tires), rims, spokes, hubs, brake brake rims, bearings, and front and rear axles. The rim (steel ring) is rolled and welded from a steel plate. The hub is die-cast from aluminum alloy, and the brake rim is inlaid and integrally molded with flanges at both ends for mounting spokes. The spokes are similar in shape to bicycle strips for connecting the rim and the hub. The hub is equipped with a brake, the front wheel is also equipped with a worm gear and a worm of a speedometer, and the rear wheel is equipped with a drive mechanism.

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This type of hoof block automatic clutch is used in some miniature motorcycles. The active part is a fixed seat driven by the crankshaft. The seat has three shoe block assemblies and is connected to the fixed seat by a pin. The spring pulls the shoe block toward the seat. The center of the crankshaft maintains a certain gap between the shoe of the shoe assembly and the clutch disk of the driven portion. When the rotation speed is increased, the centrifugal force generated by the shoe block is greater than the tension force of the spring, and is opened outward. When the centrifugal force reaches a certain value, the clutch plate is engaged with the friction plate to generate the frictional force to drive the driven portion to transmit the power.

Secondary deceleration and transmission

With the different types of motorcycles, there are three transmission modes: belt drive, chain drive and universal joint shaft drive. In the micro-motorcycle multi-purpose belt transmission as the rear transmission, the size of the main and driven pulleys determines the secondary reduction ratio. Generally, motorcycles use chain transmission for rear transmission. Chain drive, simple structure, few parts, easy to manufacture and repair. There is a rear drive drive sprocket on the output shaft of the gearbox, and a driven sprocket on the rear wheel to transmit power with the corresponding sleeve roller chain. In the motorcycle of the larger power engine, its rear transmission mode adopts the universal joint shaft transmission, and the rear wheel is equipped with a subsidized stage of the spiral gear.

Walking system
The function of the walking system is to support the weight of the entire motorcycle and the load, ensuring stable operation and comfortable ride.

Frame: It is the skeleton of the entire motorcycle, welded by steel pipes and steel plates. It connects the engine, gearbox, fork, rear suspension, etc. to each other and has high strength and rigidity. Scooter-type frames are often used for stamping and welding. In general, motorcycles use a welded steel frame, a cradle frame or a combination frame of steel plates and steel pipes. Some high-power engine motorcycles use a steel-welded double-cradle cradle frame.

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