In the 20s and 70s, 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:

　　①High 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.

　　②Building block type combination design.The basic parameters adopt the priority number, the dimensions are neat, the parts are universal and interchangeable, the series is easy to expand and the pattern is renovated, which is conducive to the organization of mass production and the reduction of costs.

　　③Diversified types and many variant designs.Get rid of the traditional single base installation method, add hollow shaft suspension type, floating support base, integrated connection of motor and reducer, multi-directional mounting surface and other different types to expand the scope of use.

　　The main factors that promote the improvement of the reducer level are:

　　①Theoretical 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.).

　　②Adopt good materials and generally use various high-quality alloy steel forgings, and the quality control level of materials and heat treatment is improved.

　　③The structure design is more reasonable.

　　④The machining accuracy is improved to ISO5-6 level.

　　⑤The bearing quality and life are improved.

　　⑥The quality of lubricating oil is improved.

　　Since the 20s, my country has successively formulated standards for a number of general-purpose reducers such as JB60-1130 "Cylindrical Gear Reducer". In addition to self-made and matching use by OEMs, a number of professional reducer manufacturers have also been formed.At present, there are hundreds of companies producing reducers across the country, with an annual output of about 70 general-purpose reducers, which have contributed to the development of my country's mechanical products.

　　Most of the reducers in the 20s were made with reference to the technology of the Soviet Union in the 60s and 20s. 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, my country has introduced a batch of advanced processing equipment, and 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 179-60 of JB8-9 to level 10095 of GB88-6, 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 in our country has reached 42000kW, and the gear circumferential speed has reached more than 150m/s.However, the technical level of most reducers in my country is not high, and old products cannot be replaced immediately. The coexistence of new and old products will take a long time.