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Planetary reducers are widely used in many industries. Compared with gear reducers, planetary reducers have better gear meshing accuracy, high accuracy, low noise during operation, small overall volume, suitable for various working environments, and can be flexibly installed in narrow working environments. What is the internal structure diagram of the planetary reducer and the principle structure diagram of the reducer? Let's follow the diagram to understand. The main transmission structure includes planetary gear, sun gear and internal gear ring. Planetary gear reduction is the principle of gear reduction. There is a gear with a fixed axis position called the center gear or the sun gear. There is a gear with a variable axis on the side of the sun gear. The gear that both rotates and revolves is called the planet gear. The planet gear has a supporting member called the planet carrier. Through the planet carrier, the power is transmitted to the shaft and then to other gears. They are composed of a group of several gears to form a gear train. There is only one prime mover, and this epicyclic gear train is called a planetary gear train. Planetary reducer is a kind of servo reducer. Let's analyze the internal structure and operation principle of planetary reducer. Planetary reducer is a mechanical transmission component that connects servo motor and application load in motion control system. The role of planetary reducer in the operation control system of mechanical equipment mainly includes: transmitting motor power and torque; Transmitting and matching power speed; Adjust the inertia matching between the mechanical load at the application end and the motor at the drive side; Internal structure diagram of planetary reducer It can be seen that in the structure of the planetary gear set, a plurality of gears surround a sun gear along the inner ring of the reducer housing, and when the planetary reducer is operating, with the rotation of the sun gear, the surrounding gears will also "revolve" around the sun gear. Because the layout of the core transmission part is very similar to that of the stars in the solar system revolving around the sun, this reducer is called a "planetary reducer". Sun gear is usually called "sun gear", which is driven and rotated by the input servo motor through the input shaft. In the internal structure diagram of the planetary reducer, there are a number of gears rotating around the sun gear, which are called "planet gears". One side meshes with the sun gear, and the other side meshes with the annular internal gear ring on the inner wall of the reducer housing. It carries the torque power transmitted from the input shaft through the sun gear, and transmits the power to the load end through the output shaft. In normal operation, the orbit of the planetary gear "revolving" around the sun gear is the annular internal gear ring on the inner wall of the reducer housing. When the sun gear rotates under the drive of the servo motor, the meshing action with the planetary gear causes the planetary gear to rotate; At the same time, because the other side of the planetary gear meshes with the ring-shaped internal gear ring on the inner wall of the reducer housing, the planetary gear will eventually roll on the ring-shaped internal gear ring in the same direction as the rotation of the sun gear under the action of the self rotation driving force, forming a "revolving" movement around the sun gear. Usually, each planetary reducer will have multiple planetary gears, which will rotate around the central sun gear at the same time under the action of the input shaft and sun gear rotation driving force, and jointly assume and transmit the output power of the reducer. It is not difficult to see that the input speed of the planetary reducer on the motor side (i.e., the speed of the sun gear) is higher than the output speed on the load side (i.e., the speed at which the planetary gear revolves around the sun gear), which is why it is called a "reducer". The speed ratio between the motor drive side and the application output side is called the reduction ratio of the planetary reducer, or "speed ratio" for short. It is usually represented by the letter "I" in the product specification. It is determined by the ratio of the size (perimeter or number of teeth) of the ring inner gear ring and the sun gear. In general, the speed ratio of planetary reducer with single-stage reduction gear set is usually between 3 and 10; For planetary gear reducers with a speed ratio of more than 10, two-stage (or more) planetary gear sets shall be used for reduction. Like all operation control transmission mechanisms, when using planetary reducer in operation control equipment, its transmission efficiency, rigidity and accuracy should also be considered. Due to the large number of meshing teeth and the large overall contact area of gear mesh during operation, the planetary reducer has higher power transmission efficiency, stronger torque power output capacity and harder transmission rigidity than the ordinary fixed gear reducer. Generally, the transmission efficiency of the servo planetary reducer can reach more than 97%, the back clearance is generally less than 3 arcmin, and the rigidity can reach 3 nm / arcmin or even higher. Operating principle of planetary reducer (diagram) (1) The gear ring is fixed, the sun gear is active, and the planet carrier is passive. It can be seen from the demonstration that this combination is speed reduction transmission, and the transmission ratio is generally 2.5 ~ 5, with the same steering. (2) The gear ring is fixed, the planet carrier is active, and the sun gear is passive. It can be seen from the demonstration that this combination is speed-up transmission, and the transmission ratio is generally 0.2 ~ 0.4, with the same steering. (3) The sun gear is fixed, the gear ring is active, and the planet carrier is passive. It can be seen from the demonstration that this combination is a deceleration transmission, with a transmission ratio of 1.25 ~ 1.67 and the same steering. (4) The sun gear is fixed, the planet carrier is active, and the gear ring is passive. It can be seen from the demonstration that this combination is speed-up transmission, and the transmission ratio is generally 0.6 ~ 0.8, with the same steering. (5) The planet carrier is fixed, the sun gear is active, and the gear ring is passive. It can be seen from the demonstration that this combination is a speed reduction transmission, with a transmission ratio of 1.5 ~ 4 in general, and the steering is opposite. (6) The planet carrier is fixed, the gear ring is active, and the sun gear is passive. It can be seen from the demonstration that this combination is speed-up transmission, and the transmission ratio is generally 0.25 ~ 0.67, and the steering is opposite. (7) Combining any two of the three elements into one: When the planet carrier and the gear ring are integrated as the driving part, the sun gear is the passive part, or the sun gear and the planet carrier are integrated as the driving part, and the gear ring is the passive part. From the demonstration, we can see that there is no relative movement between the planetary gears. They operate as a whole, with a transmission ratio of 1 and the same steering. This combination is often used in automobiles to form direct gears. 8) Any one of the three elements is active, and the other two elements are free: It can be seen from the analysis that the other two components have no definite rotational speed output. The sixth combination mode, because of the large speed rise and the reverse steering of the active and passive parts, is usually not used in automobiles. The other seven combinations are commonly used.