There are a set of rolling bearings on the left and right sides in the flywheel, and each set of rolling bearings consists of steel bowls, steel balls and steel blocks. Steel bowls are made directly on the left and right inner sides of the jacket, which means that there is a circle of very smooth fairways on each inner side of the jacket. The steel block on the left side of the rolling bearing is flat and riveted firmly with the iron core. The steel block on the right side of the excitation bearing is a screw block. The inner diameter of the screw block is processed with M39x l thread and screwed on the iron core. The thread of the screw seat is left-handed (reverse tooth). In order to facilitate the disassembly and assembly of the steel wire stopper, two circular concave tips are machined on its outer end surface. The steel ball in the flywheel is relatively small; There are many steel balls in the flywheel, reaching 106 or 1 14. Some flywheels are also equipped with isolation rods. Gasket diameter is 42 inches. 5 mm and 8 mm long steel cylinders. Spacer bars and steel balls are installed on the fairway at intervals. The spacer actually acts as a ball rack, distributing the steel balls evenly in the flywheel. Flywheels equipped with spacer bars can save more than two thirds of steel balls. There are only 32 steel balls and 32 spacer bars in the flywheel. When the number of steel balls is less, the contact points of the key ball with the steel bowl and key block are less, thus improving the sensitivity of the rolling bearing. In order to adjust the clearance of the rolling bearing, the flywheel gasket is also installed between the iron core and the thread stop.

The rotating relationship of the rolling bearing in the flywheel is that both the flat gear and the linear gear are installed on the core, and the core is installed on the rear axle component. When the bicycle goes forward, the core

The flat gear and the line gear rotate together with the rear wheel. The outer sleeve can rotate relative to the core, the flat block and the threaded block, that is, relative to the rear axle assembly.

2. Ratchet and pawl in flywheel

The coat has an inner ring of teeth and external teeth. The external teeth are meshed with the chain; The internal teeth mesh with the jack. Each flywheel has two jacks, both ends of which are installed in cylindrical grooves on both sides of the iron core. The jack rotates around the end of the cylinder. The tooth tip of the jack is supported by the jack spring and engages with the internal teeth of the sheath. The jack spring is made of spring steel wire with a diameter of only 40.3-o.35 mm, and the AB section of the jack spring is inserted into the small hole at the bottom of the core groove (the small hole is opposite to the cylindrical tip of the jack). The other is in the groove on the back of the jack.

Third, the car strip.

The track connects the front uranium component or the rear uranium component with the rim. It consists of spokes, bars and bars. One end of the spoke is a big head, and the big head is curved, almost perpendicular to the long bar. When installing, the big head is buried in the head-on holes of the left and right dials; The other end of the strap is threaded and connected with the strap on the vehicle. The bus bar is made of copper alloy, which can prevent the spokes and rims from rusting. It is made of thin iron sheet, which has the same shape as the inner wall of the automobile drawing and can completely fit the inner wall of the automobile. The strip-shaped pad can disperse the strip-shaped pulling force to the edge and not concentrate on the edge of the strip-shaped hole. At present, only thicker spokes are equipped with pads.

1. Press-fit valve

The middle of the valve body runs through, and there is a frustum inside to match with the valve core; The upper end of the valve core is provided with two symmetrical grooves, and two convex ribs of the valve core are installed in the grooves; Its outer diameter is threaded, at the same time, there are two parallel wrench planes on both sides of the thread, and its lower part has a chassis, which is left in the inner tube during assembly, and the rest is exposed outside the inner tube. The hexagon nut clamps the inner tube between the valve body chassis and the valve washer, so that the gas in the inner tube will not leak from between the valve body and the valve washer. If the valve washer is disc-shaped, and the disc mouth is pressed against the inner tube, the middle hole is not circular, but the two sides are parallel, which is exactly the same as the cross-sectional shape of the valve body (the two sides of the valve body are processed into parallel planes). In this way, it is impossible for the valve washer to rotate when sleeved on the valve body, which plays a role in preventing loosening. The main function of the round lock nut is to fix the valve on the rim. The valve hose is a small round tube made of latex with good elasticity. When in use, it is sleeved outside the valve core, covering the small air holes on the frustum top and the valve core. The frustum of the valve core is matched with the frustum in the valve body, and the valve hose is separated in the middle. When the air compressor nut is tightened to press the valve core, the valve hose is compressed, so there is no possibility of air leakage between the two frustums. There is an air passage in the middle of the valve core, but the small end of the valve core is sealed. In order to let gas into the inner tube, there is a small air hole on the valve core. When the inflator delivers gas to the valve core, the gas expands the valve hose wrapped outside the valve core through the air hole, and enters the valve body and the inner tube from the gap between the valve hose and the valve core; When the air pump stops conveying gas, the elasticity of the valve hose and the air pressure of the inner tube immediately make the valve hose contract and seal the air hole on the valve core. In order to prevent dust or fine sand particles from entering the valve core, a plastic or metal dust cap is also installed on the valve core.

The chain parts are installed on the sprocket and flywheel. The chain transfers the pedal force from the crank sprocket to the flywheel and the rear wheel to push the bicycle forward. The chain consists of many external parts and internal parts, which are connected into a long string by pins. The pin shaft and the outer part are pressed into a whole, and there will be no relative rotation between them. There will be relative rotation between the inner plate and needle uranium. Because the inner part has a gasket and there is a gap between the pin shaft and the gasket, there is no gap between the inner part and the gasket (pressed into a whole). In addition, a roller is installed outside the washer, which can rotate around the washer. When the bicycle moves forward, the roller contacts the teeth of the sprocket or flywheel. In order to increase the hardness and wear resistance of pin uranium, liner ring and roller, they are all carburized and quenched. The chain is equipped with a detachable movable joint, which is specially used to facilitate the installation and disassembly of the chain. Movable joints consist of uranium joints. The joint shaft is equivalent to two pins fixed on the outer piece. The joint piece is equivalent to the outer piece. The two ends of the spring plate are clamped in the groove at the end of the joint shaft, so that the quick-acting joint will not loosen. The distance between two uranium sales centers is called chain pitch.