From the 1970s to the 1980s, the world’s reducer technology had a great development, and it was closely integrated with the development of the new technological revolution. The development trend of general reducer is as follows:
1. High level and high performance: Cylindrical gears generally adopt carburizing, quenching and tooth grinding, and the carrying capacity is increased by more than 4 times, with small size, light weight, low noise, high efficiency and high reliability;
Reducer
2. Building block combination design: the basic parameters adopt priority numbers, the size specifications are neat, the parts are universal and interchangeable, the series is easy to expand and the pattern is refurbished, which is beneficial to organize mass production and reduce costs;
3. Diversified types and many variant designs: getting rid of the traditional single base installation method, adding hollow shaft suspension type, floating support base, integrated connection of motor and reducer, multi-directional mounting surface and other different types, expanding the scope of use .
The main factors that promote the improvement of the reducer level are:
1. Theoretical knowledge is getting better and closer to reality (such as gear strength calculation method, modification technology, deformation calculation, optimization design method, smooth transition of tooth root, new structure, etc.);
2. Good materials are used, and various high-quality alloy steel forgings are generally used, and the quality control level of materials and heat treatment is improved;
3. The structure design is more reasonable;
4. The processing accuracy is improved to ISO5-6 level;
5. Improved bearing quality and life;
6. The quality of lubricating oil is improved.
Since the 1960s, China has successively formulated standards for a number of general-purpose reducers such as JB1130-70 “Cylindrical Gear Reducer”. In addition to self-made and matched use by OEMs, a number of professional reducer manufacturers have also been formed. There are hundreds of companies producing reducers in the country, with an annual output of about 250,000 general reducer, which have contributed to the development of China’s mechanical products.
Reducer
Most of the reducers in the 1960s were made with reference to the technology of the Soviet Union in the 1940s and 1950s. Although they have been developed later, they are limited to the design, technological level and equipment conditions at that time, and their overall level is far from the international level. .
Since the reform and opening up, China has introduced a number of advanced processing equipment, and has gradually mastered the design and manufacturing technology of various high-speed and low-speed heavy-duty gear devices through the introduction, digestion, and absorption of foreign advanced technology and scientific research. Material and heat treatment quality and gear processing accuracy have been greatly improved. The manufacturing accuracy of general cylindrical gears can be increased from JB179-60’s 8-9 level to GB10095-88’s level 6, and the manufacturing accuracy of high-speed gears can be stabilized at 4-5 level. After some reducers adopt hard tooth surfaces, the volume and mass are obviously reduced, and the carrying capacity, service life, and transmission efficiency have been greatly improved, which plays a great role in energy saving and improving the overall level of the host.
The power of the high-speed gear reducer (increase) designed and manufactured by China has reached 42,000 kW, and the gear circumferential speed has reached more than 150m/s. However, the technical level of most reducers in China is not high, and old products cannot be replaced immediately. The coexistence of new and old products will take a long time.