Design method of high-reduction-ratio hypoid gear for high-precision robot

Abstract

The invention discloses a design method of a high-reduction-ratio hypoid gear for a high-precision robot. The method comprises steps that (1) gear design parameter calculation is divided into geometric limitation conditions of design parameters and gear blank pitch cone parameter calculation, and the geometric limitation of the design parameters is mainly used for limiting an offset distance E, ahelical angle beta, the tooth surface width b and an addendum coefficient fa; 2) tooth surface equation derivation and adjustment parameter calculation of a hypoid gear with the small tooth number andthe large reduction ratio are performed, due to the fact that the speed ratio of the hypoid gear with the large reduction ratio is larger than 15, the large gear is machined through a forming method,the hypoid gear with the large reduction ratio adopts a contraction mode of equal-height teeth, namely the large and small gear face cone angle and a root cone angle are equal to pitch cone angles, and an addendum coefficient of the large gear is equal to 0. The method is advantaged in that an undercut, a contact ratio and the gear meshing strength of the gear are analyzed, the small gear adoptsa larger helical angle, so a larger equivalent gear tooth number is obtained, and the undercut of the small gear caused by the small tooth number is avoided.

Description

technical field [0001] The invention belongs to the field of gear processing, and in particular relates to a design method of a large reduction ratio hypoid gear for a high-precision robot. Background technique [0002] With the long-term planning of Made in China 2025, the domestic industrial robot industry is developing rapidly. Bevel gears are used in the wrist joints of industrial robots. High requirements, such as 1:45 / 2:60 / etc. with a large reduction ratio hypoid gear with a transmission ratio greater than 15. [0003] At present, the large-reduction ratio hypoid gears of domestic robots are generally imported, with high prices and long delivery times. The main import source is Japan's Kohara Gear Co., Ltd. There are standard large-reduction ratio gears, but there are no ground high-precision gears, which is difficult to meet the requirements of the installed machine. Requirements, the current domestic research on gears with large reduction ratios is still in colleges...

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Problems solved by technology

[0005] Overseas research is earlier and has been adopted in robots. In Japan, Kohara Gear Co., Ltd. has standard gears with large reduction ratios, but the modulus is less than 1.5mm and cannot be ground. The United States or Germany have mature technologies, but they are sold abroad. When designing equipment, the design software cannot calculate bevel gears with less than 5 teeth, so bevel gears with less than 5 teeth cannot be processed, which also restricts the application of this technology in gear processing in my country

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