Hypoid gear with small number of teeth and large reduction ratio also has some shortcomings compared with other staggered shaft transmission. For example, the small number of teeth of the small wheel is easy to undercut or sharpen the tooth top, and the increase of the spiral angle of the small wheel is easy to cause tooth shape variation; In addition, compared with the general spiral bevel gear, the calculation of geometric parameters is more complex and the machining will be more difficult.
Although the hypoid gear with small number of teeth and large reduction ratio has some shortcomings mentioned above, these problems will be solved gradually with the in-depth theoretical research of hypoid gear with small number of teeth and large reduction ratio. For example, in the design of geometric parameters, the radial displacement and tangential displacement of gear teeth can be comprehensively used, and some basic parameters such as the pressure angle of large and small wheels, the helix angle of small wheels and the width of large gear teeth can be reasonably selected to avoid tooth tip sharpening and undercutting. In addition, the bearing capacity of hypoid gear transmission with small number of teeth and large reduction ratio can also be improved by improving the performance of gear material. Therefore, hypoid gears with small number of teeth and large reduction ratio have extensive development potential in some fields of precision indexing, CNC machine tool servo, mechatronics equipment and civil machinery industry.
At present, miniaturization, high speed and low consumption have become an important development direction of hypoid gear transmission. Single stage large transmission ratio has become an important means to achieve this goal. In the mechanical transmission system, the increase of transmission ratio often means the low transmission efficiency. Therefore, in order to meet the needs of high transmission ratio and high efficiency, the type of single-stage high reduction ratio transmission came into being. At present, the most common types of large reduction ratio transmission mainly include the following: worm gear, planetary gear and harmonic gear transmission. Among the above described transmission types with large reduction ratio, the traditional worm gear transmission can ensure that the transmission device has a large transmission ratio, but the adoption of worm gear transmission not only has low transmission efficiency, but also has low bearing capacity. In order to increase the wear resistance of worm gear, the gear ring of worm gear needs to be made of expensive bronze, and the processing and manufacturing cost is relatively high. The adoption of planetary gear transmission can also ensure that the transmission device has a relatively large transmission ratio, but when the required transmission power is relatively large, the design of its transmission structure is relatively complex. Due to the mutual rotary transmission between a series of gear shafts, the manufacturing accuracy requirements of the planetary carrier are also relatively high, which can be seen, The efficiency and transmission ratio of planetary gear transmission restrict each other. Compared with the above two kinds of transmission, hypoid gear can maintain high transmission efficiency while maintaining a large single-stage transmission ratio, and large and small wheels can be manufactured by hardened gear grinding process. Therefore, hypoid gear with small number of teeth and large reduction ratio has been used to replace worm gear or planetary gear transmission in some precision indexing, CNC machine tool servo and mechatronics equipment. Therefore, hypoid gears with small number of teeth and large reduction ratio have broad application prospects in the field of gear transmission.
The research on hypoid gear transmission technology with small number of teeth and large reduction ratio and the development of hypoid gear transmission with small number of teeth and large reduction ratio with independent intellectual property rights in China are of great significance to the development of gear transmission devices in China.