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2018

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11

Come on, go without shifting, the original scooter motorcycle is so variable speed!

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The CVT mechanism is based on the design of Puli disk and belt. According to the increase or decrease of engine speed, it can automatically change various deceleration ratios. Automatic clutch design, so that when the vehicle stops waiting for a red light, do not operate the clutch, and do not have to worry about the engine will stall.
Vehicles with ordinary gears must operate at least throttles, clutches and gears. CVT system used on scooter motorcycles saves the knight from shifting gears. It only needs to operate throttles to drive the vehicle easily, and the vibration caused by the combination of belt and Plywood plate is relatively low, but the transmission efficiency is relatively low. especially when changing speed, the belt rubs against the disk face. It will affect the efficiency of power transmission.
Belt drive can be divided into two kinds: single-tooth belt and double-tooth belt. Single-tooth belt is common on small scooter motorcycles, while double-tooth belt is common on large scooter motorcycles or American cruise vehicles.
The Plywood plate installed on the crankshaft end receives power from the engine. It is commonly known as the "front drive group" in conjunction with the Plywood beads. When the engine speed starts to increase, the Plywood beads will throw out because of the centrifugal force, while pushing the Plywood disk, shortening the distance between the two discs, pushing the V-belt out of the two discs, simulating the increase of the front teeth of the gearbox; conversely, when the engine speed starts to decline, the Plywood beads losing centrifugal force will gradually approach the crankshaft, and the position of the V-belt will also be close to the crankshaft. In order to simulate the state of rear gear enlargement.
Puli beads placed in the Plywood disk are important factors in the transmission mechanism.
The lines on the outer disc of Puli can introduce air and increase heat dissipation when it rotates.
The rear drive group is composed of three mechanisms: open and close disc, large spring and clutch. When the front drive group starts to move, the rear drive group will also start to operate by V belt, while the V belt clamped between the open and close discs will start to control the distance between the open and close discs. At this time, the big spring will start to play the role of speed change. Its softness and hardness affect the speed of the vehicle, and the speed of speed change can be compared to the speed and slowness of the shift action of the gearshift vehicle.
The Secret of CVT Not Turning Out: Clutch
The function of clutch is to keep the car from stalling when the tire stops. For general gear cars, the clutch must be operated manually, but on scooter motorcycles, it is not necessary to control the clutch manually. This is because CVT system takes speed as setting and designs automatic clutch.
The clutch used in CVT system is called centrifugal clutch. According to the mechanical structure, it can be divided into clutch cover (commonly known as bowl-gong), clutch plate and driving plate. The clutch plate and driving plate are connected with the opening and closing disc group, while the clutch cover is connected with the rear wheel through the transmission rear axle. Besides maintaining the engine operation, it also shoulders the responsibility of rotating the rear wheel.
The clutch is connected with the opening and closing discs.
The bowl male connected with the rear wheel will also drive the rear wheel when it rotates. When the engine speed is increased, the belt starts to drive the rear opening and closing disc to rotate, then the drive plate connected with the opening and closing disc will rotate, the clutch disc will be thrown outward because of centrifugal force, and the clutch disc will be combined to drive the bowl disc, because the bowl disc is connected with the rear wheel, so the rear wheel will follow the rotation, and then drive the vehicle forward; conversely, when the accelerator speed drops, the clutch disc will be with the clutch disc disc. The bowl is separated and the rear wheel power is cut off, but the engine will not stop running.
The Secret of CVT Acceleration: Torsion Cam
Based on the above principles, the CVT transmission mechanism of scooter motorcycle is mainly controlled by engine speed, and can not be changed according to the needs of knights or road conditions. If CVT faces the situation of "re-acceleration", engineers add the design of torsion cam to the CVT system of scooter motorcycle.
Grooves and beads are torsional cams
Torsional cam is similar to gear reduction. When a vehicle encounters an uphill or overtaking, it increases the throttle. By means of mechanical principle, the torsional cam can sense the instantaneous output of torque, and at the same time, it promotes the opening and closing of the disc to shorten the distance again. Thus, the deceleration ratio of the overall transmission system will increase, similar to the effect of gear reduction.

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