Steering and braking system of motorcycle

Update:10 Sep 2019
Summary:

(1) Steering: The front wheel and the handlebar coopera […]

(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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