The structural principle of bicycle transmission, the principle and adjustment of bicycle transmissi

Automatic transmission.

According to the speed of the car, engine speed, power load and other factors, the automatic upshift and downshift, without the need for the driver to operate the clutch.

Shifting gears, easy to use. Especially when driving on urban roads with heavy traffic, automatic transmissions are very convenient. Automatic transmissions are more efficient than manual transmissions.

Much more complex, there are many aspects that are not the same, but the biggest difference is in the control aspect. The manual transmission is operated by the driver, the upshifts or downshifts are operated by humans, while the automatic transmissions are automatically controlled by the machine, and the shifts are carried out by hydraulic controls.

In the case of a typical automatic transmission, the hydraulic controls are based on the throttle.

throttle) opening and signals transmitted from the transmission output shaft control the upshift. According to the change of throttle opening, the regulating valve in the hydraulic control unit generates hydraulic pressure proportional to the amount of accelerator pedal pedal, which is added to the hydraulic control device as a throttle opening "signal"; In addition, a quick-control hydraulic valve mounted on the output shaft generates hydraulic pressure proportional to the rotational speed (vehicle speed) and is added to the hydraulic control device as a "signal" for the vehicle speed. As a result, there is a throttle opening "signal" and a vehicle speed "signal", according to which the hydraulic control automatically adjusts the amount of oil in the transmission and thus controls the timing of gear changes.

In other words, when the driver steps on the accelerator pedal (accelerator pedal) to control the throttle opening and the driving speed of the car (transmission output shaft speed), the driver can automatically control the hydraulic control device in the transmission, and the hydraulic control device will use hydraulic force to control the planetary gears.

The clutch and brakes of the system to change the transmission state of the planetary gears.

The core control of an automatic transmission is the hydraulic control, which consists of the oil pump, valve body, clutch, brake, and the fluid path that connects all of these components. The key component is the valve body, so it is the control center of the automatic transmission. The function of the valve body is to control the oil pressure output from the oil pump to each actuator according to the load condition of the engine and chassis drive train (throttle opening and output shaft speed) to control the torque converter.

Control the combination and disengagement of each clutch and brake to achieve automatic gear shifting.

The above is the basic control form of automatic transmission, if it is an electronic control automatic transmission, it is necessary to add a solenoid valve on the basis of the above, and the ECU (electronic control unit) controls the working process of the automatic transmission with the help of a solenoid valve. The ECU input circuit receives the input signals from sensors and other devices, filters and amplifies the signals, and then converts them into electrical signals to drive the controlled solenoid valve to work. Therefore, electronically controlled automatic transmissions need to add throttle position sensors, vehicle speed sensors, water temperature sensors, and hydraulic temperature sensors.

Digital signals such as engine speed sensors, gear switches, brake light switches, etc.

Feed into the ECU, which allows the ECU to precisely control the solenoid valve, so that the shift and lock times are accurate, making the car run more smoothly and save fuel.

The working principle of a bicycle transmission is to rely on a wire rope to pull the transmission, and the transmission changes the position of the chain by changing its position, so the chain can jump to different gears and change the speed.

The function of the bicycle transmission system is to change the speed of the bicycle by changing the coordination of the chain and the gear discs of different front and rear sizes. The size of the front chainring and the size of the rear chainring determine how hard the bike rotates the pedals.

The larger the front chainring, the smaller the rear chainring, and the more laborious it is when pedaling. The smaller the front chainring and the larger the rear chainring, the more relaxed it is when pedaling. Depending on the rider's ability, the bike can be adjusted by adjusting the size of the front and rear chainrings, or to cope with different road sections and road conditions.

Bicycle transmission adjustment:

1. When riding and climbing, change the speed in advance, change the chain disc to the middle disc or small disc, and adjust the flywheel to the large flywheel.

2. When going uphill, I feel a little struggling, hurry up and step on two more feet, and take the opportunity to change to a smaller flywheel, which is very important.

3. It is not effortless to go uphill after shifting, and it is very important that the gear shift should be changed in the case of pedaling easily, which can not only avoid the loss of the chain slipper, but also prolong the use time of the chain.

4. If there is an abnormal sound of the chain, see if there is more stolen goods or lack of lubricating oil, and if there are more stolen goods, it should be cleaned with gasoline and lubricated with oil.

The gearshift bike has two gears at the front and rear, the front gear has three gears, which are controlled by the left handlebar, and the rear gear is generally divided into seven gears, eight gears, nine gears, seven gears for 21 gears, eight gears for 24 gears, and nine gears for 27 gears.

The larger the front gear, the smaller the rear gear, the more strenuous it is to pedal the bike, but the bike speed is relatively fast; The smaller the front gear and the larger the rear gear, the easier it is to pedal the bike, but the speed is a bit slower.

When riding a bicycle to climb a hill, you can adjust the front gear to 1, which is the largest gear, and the rear gear can be adjusted to 1-3, and the rear gear is the largest when adjusted to 1, so it is very easy on the uphill section. If the front gear is adjusted to 3, then the rear gear can be adjusted to 4. This can also be done in the event of a headwind.

How does a shifter bike change gear? When we use a shifting bike, we encounter different road sections, and we can change the speed by simply adjusting the button bicycle transmission on the handlebar, bringing lightness and pleasure to the ride. Bicycle shifting is actually achieved by adjusting the gear ratio of the crankset to the flywheel, which also contains many mechanical principles.

The bicycle can move forward, which is powered by the pedals of the bicycle and the friction generated by the rotation of the rear wheels. And the rotation of the rear wheel is driven by the chain on the central shaft, the sprocket flying gear on the rear axle, each tooth of the two wheels corresponds to the hole between the chains, the large gear turns a tooth, the gear must also turn a tooth, and it is impossible to slip. In the new type of variable speed bicycle, there are several tooth discs with different diameters and different number of teeth on the central axle sprocket, and the rear axle flywheel has several tooth discs with different diameters and teeth.

The bicycle flywheel is fixed at the right end of the rear axle with internal thread screwing, maintains the same plane with the sprocket, and is connected with the sprocket through the chain to form the driving system of the bicycle. In terms of structure, it can be divided into two categories: single-stage flywheel and multi-stage flywheel. The single-stage flywheel, also known as the single-chain wheel flywheel, is mainly composed of parts, such as a jacket, a flat block and a core, a jack, a jack spring, a washer, a wire block, and a few steel balls.

The working principle of its single-stage flywheel: when the pedal is stepped forward, the chain drives the flywheel to rotate forward, then the flywheel internal tooth and the jack are contained, and the rotating force of the flywheel is transmitted to the core through the jack, and the core drives the rear axle and the rear wheel to rotate, and the bicycle moves forward. When the pedal is stopped, the chain and the jacket do not rotate, but the rear wheel still drives the core and the jack to rotate forward under the action of inertia, and the flywheel inner tooth produces relative sliding, thereby compressing the core into the notch of the core, and the jack compresses the jack spring.

When the jack tooth top slides to the top of the flywheel's inner teeth, the jack spring is compressed the most, and then slides forward a little, and the jack is bounced to the tooth root by the jack spring, making a "click" sound. The core rotated faster, and the jacks quickly slid on the inner teeth of each flywheel, making a "click" sound. When the pedal is reversed, the jacket rotates in reverse, which will accelerate the sliding of the jack, making the "click" sound more urgent.

The multi-stage cassette is an important part of the bicycle transmission. The multi-stage flywheel is based on the single-stage flywheel, adding several flywheel pieces, combined with the sprocket on the central axle, to form a variety of different transfer ratios, thus changing the speed of the bicycle.

How an automatic transmission works.

Transmission principle:

The working principle of the bicycle transmission is to rely on the wire rope to pull the transmission, and the transmission changes the position of the chain by changing the position, so the chain can jump to different gears and change the speed (commonly known as weight).

Transmission adjustment:

There are two screws on the transmission, one is H and one is L, first adjust and then dial, adjust the speed to the minimum flywheel piece, loosen the positioning screws H and L, re-loosen the nut of the lock transmission line, tighten the line in the lock nut, and see if the guide wheel of the rear derailleur is in a plane with the minimum flywheel (if not, adjust the H positioning screw to keep it in a plane).

The inner three-speed gearbox is available in three gears: Light, Flat and Fast (27% lighter, 36% faster than standard), and is especially suitable for older people, women, students, and some people with poor physical condition. Because the use of the inner three-speed is especially uphill, on the bridge, and against the wind, it will feel very relaxed and comfortable when driving, and at the same time can reduce the consumption of physical energy.

As an internal transmission system, the main transmission device is hidden inside the hub and protected by multiple layers of special sealing materials. Therefore, rainwater, dust, and grease cannot enter, so regular maintenance is not required, and the advantage of maintenance-free is realized.

When driving a bicycle, the pedal will make the pedal stressed, and the transmission of the bicycle is pulled through the wire rope after the force, and the transmission is brightened because of the pull, so that the position of the chain changes.

The larger the front chainring of the bike, the smaller the rear chainring, which will be laborious when pedaling, and the smaller the front chainring of the bike, the larger the rear chainring, and it is easy to pedal.

The principle of bicycle transmission is that when people are driving bicycles, they pedal on the pedal, and the pedal is stimulated by Senhu to pull the transmission of the bicycle through the wire rope, and the transmission changes its original position because of the pull, and then the position of the chain has changed accordingly, so that the chain can jump on the different gears of the bicycle, and the speed of the bicycle has been changed accordingly.

In the whole process of bicycle movement, the size of the front and rear chainrings will determine the strength of pedaling, the larger the front chainring, the smaller the rear chainring, the more laborious the pedaling, but the cracking bicycle will become longer, the smaller the front chainring, the larger the rear chainring, the easier it is to pedal, but the distance the bicycle will be shorter.