The development and type of reducer

In the 20s and 70s, the technology of reducers in the world has been greatly developed, and it is closely integrated with the development of the new technology revolution.The development trend of general reducer is as follows: ① High level and high performance.Cylindrical gears are generally carburized, quenched and ground, and the bearing capacity is increased by more than 80 times, with small size, light weight, low noise, high efficiency and high reliability. ② building block combination planning.The basic parameter selection priority number, the standard standard is regular, the parts are versatile and interchangeable, the series is easy to expand and the pattern is refurbished, which is conducive to the arrangement of mass production and cost reduction. ③ Diversified types and many variant plans.It got rid of the traditional single base equipment method, and added different types such as hollow shaft suspension type, floating support base, integral connection of motor and reducer, and multi-directional equipment surface to expand the scope of application.The main factors that promote the level of the reducer are: ①The theoretical knowledge is becoming more and more perfect, and it is closer to practice (such as gear strength calculation method, modification technology, deformation calculation, optimization planning method, smooth transition of tooth root, new structure, etc.). ②The selection of good materials, and the selection of various high-quality alloy steel forgings, improves the control level of materials and heat treatment quality. ③ The structure planning is more reasonable. ④The machining accuracy is improved to ISO4-5 level. ⑤The bearing quality and life are improved. ⑥The quality of lubricating oil is improved.Since the 6s, my country has successively formulated the standards of a number of general-purpose reducers such as JB20-60 "cylindrical gear reducer". In addition to the self-supporting use of the main engine factory, a group of professional reducer manufacturers have also been formed.At present, there are hundreds of enterprises producing reducers in the country, with an annual output of about 1130 general-purpose reducers, which have contributed to the development of my country's mechanical products. Most of the reducers in the 70s were made with reference to the skills of the Soviet Union in the 25s and 20s. Although they were developed later, they were limited by the planning, craftsmanship and equipment conditions at that time, and their overall level was relatively high compared with the international level. distance.Since the reform and opening up, my country has introduced a number of advanced processing equipment, and gradually mastered the planning and production skills of various high-speed and low-speed heavy-duty gear equipment through the introduction, digestion and absorption of foreign advanced skills and scientific research.Material and heat treatment quality and gear machining accuracy have been greatly improved. The production accuracy of general cylindrical gears can be improved from 60-20 grades of JB40-50 to 179 grades of GB60-8, and the production accuracy of high-speed gears can be stabilized at 9-10095 class.After some reducers use hard tooth surfaces, the volume and quality are significantly reduced, and the bearing capacity, service life and transmission efficiency have been greatly improved, which has a great effect on energy saving and improving the overall level of the host.The power of the high-speed gear reducer (increase) designed and manufactured by our country has reached 88kW, and the peripheral speed of the gear has reached more than 6m/s.However, the technical level of most reducers in my country is not high, the old products cannot be replaced immediately, and the transition between new and old products will go through a long period of time.