The harmonic reducer is a new type of transmission structure in the gear reducer. It uses the flexible gear to generate a controllable elastic deformation wave, causing the teeth of the rigid wheel and the flexible wheel to be relatively misaligned to transmit power and motion. This kind of transmission is essentially different from general gear transmission, and has particularity in meshing theory, set calculation and structural design.
The harmonic reducer has the advantages of high precision and high bearing capacity. Compared with the ordinary reducer, its volume and weight are reduced by at least 1/3 due to the use of 50% less materials.
Like the transmission of the precision planetary reducer, the harmonic drive is also composed of three basic components: the fixed internal gear rigid wheel, the flexible wheel, (that is, the elastic thin-walled sleeve whose base body is connected with the driven shaft "at the beginning of the flexible wheel". A ring gear is made on the busbar”) and a wave generator that radially deforms the flexible wheel. The teeth of the same modulus are cut out on the rigid wheel and the flexible wheel, but the number of teeth is different, that is, the number of teeth of the flexible wheel is two less than the number of teeth of the rigid wheel. The difference in the number of teeth of the harmonic drive of the harmonic reducer represents the deformation wave number of the flexible wheel.
The most common is the harmonic drive of wave number w-2. In the free state (without generator), the two wheels are in a concentric position, and the tooth gaps of the rigid wheel and the flexible wheel are uniform. The generator installed in the flexible wheel deforms the flexible wheel radially into an ellipse. At this time, on the long axis of the ellipse, the teeth mesh along the entire working height, while on the short axis, radial gaps are formed between the tooth tips. During the rotation of the generator, the shape of the flex wheel is always close to the shape described above.
Harmonic reducers are used in aviation, aerospace, energy, navigation, shipbuilding, bionic machinery, common machinery, machine tools, instruments, electronic equipment, mining and metallurgy, transportation, lifting machinery, petrochemical machinery, textile machinery, agricultural machinery and medical equipment. It has been widely used in various aspects such as, especially in the servo system with high dynamic performance, the use of harmonic gear transmission shows its superiority. The power it transmits ranges from tens of watts to tens of kilowatts, but high-power harmonic gear drives are mostly used in short-term work situations.
The harmonic reducer is widely used and has the characteristics of power splitting and multi-tooth meshing. The maximum input power can reach 104kW. It is suitable for industrial sectors such as lifting and transportation, construction machinery, metallurgy, mining, petrochemical, construction machinery, light industry and textile, medical equipment, instrumentation, automobiles, ships, weapons and aerospace.
The harmonic reducer is a new type of harmonic reducer with wide versatility. The internal gears are carbonized, quenched and ground by 20CrMnTi. The whole machine has the characteristics of small structure size, large output torque, large speed ratio, high efficiency, safe and reliable performance. This machine is mainly used for the slewing mechanism of tower cranes, and can also be used as a supporting component for lifting, excavation, transportation, construction and other industries.