Concave-convex meshing pure rolling spiral bevel gear mechanism for cross shaft transmission

Abstract

The invention discloses a concave-convex meshing pure rolling bevel gear mechanism for cross shaft transmission and a design method thereof. The concave-convex meshing pure rolling bevel gear mechanism for the cross shaft transmission comprises a small gear and a large gear, and the small gear and the large gear form a transmission pair. The axis of the small gear intersects with the axis of the large wheel. Concave spiral arc grooves are uniformly formed in the outer surface of a cone of the small gear, and convex spiral circle-arc teeth are uniformly distributed on the outer surface of a cone of the large gear. The structures of the spiral circle-arc teeth and the spiral arc grooves are jointly determined by a pure rolling meshing line parameter equation and parameters such as contact ratio and transmission ratio, and the spiral circle-arc teeth are matched with the spiral arc grooves. The spiral circle-arc teeth mesh with the spiral arc grooves during the installation of the small gear and the large gear, and the small gear and the large gear are driven by a drive to rotate to realize the transmission between two cross shafts. The concave-convex meshing pure rolling bevel gear mechanism for the cross shaft transmission and the design method thereof can be used for the design of the pure rolling bevel gear mechanism of the cross shafts, have the advantages of simple design, easy processing, high transmission efficiency, large contact ratio, high bearing capacity and the like, and can be widely applied to the fields of small, micro machines and conventional machines whichare not easy to lubricate.

Description

technical field [0001] The invention relates to the technical field of gear transmission, in particular to a concave-convex meshing pure rolling bevel gear mechanism for cross shaft transmission. Background technique [0002] As the core basic components of machinery, gears are widely used in machine tools, automobiles, robots, wind power, coal mines, aerospace and other equipment manufacturing fields and the main battlefield of the national economy. Their performance directly determines the quality of major equipment and high-end industrial products. performance and reliability. Research on core basic components such as high-performance gears is a key factor in promoting industrial transformation and upgrading, enhancing the core competitiveness of national industries, and an important measure to realize the "Made in China 2025" strategy of strengthening the country. [0003] At present, the main problem facing my country's gear industry is that the design and manufacturin...

AI Technical Summary

Problems solved by technology

The limitations of the above two transmission mechanisms are that their design methods are based on the theory of space curve meshing, and the meshing tooth surface depends on the calculation and solution of the curve meshing equation. The meshing method is a concave-convex meshing form, and the meshing point is located on the edge of the concave tooth profile. Due to edge contact during transmission, excessive local stress will be generated, which will easily cause the tooth top of the concave tooth to break and cause transmission failure. It cannot be used for conventional power and high-speed heavy-duty transmission in industrial production.

In addition, the design methods of the above two mechanisms cannot achieve a strict design of the coincidence degree, which makes the value of the coincidence degree of the transmission pair uncertain, which is not conducive to the uniform distribution of loads

Moreover, they can only realize the motion and power transmission between two parallel axes in the plane, but cannot realize the motion and power transmission between two orthogonal axes in the plane

Therefore, their scope of use is greatly limited

Chinese patent document, application number 201310049845.5, discloses "bevel gear meshing pair based on conjugate curves", including bevel gear I and bevel gear II with mutual point meshing and tooth profile curves of circular arc, the bevel gear mechanism has transmission High efficiency; the tooth surface is easy to process and manufacture, the transmission error is small, and the service life is long; but the bevel gear also has the tooth surface moving along the conjugate curve when the bevel gear I and the bevel gear II mesh, so there is relative sliding between the tooth surfaces , the tooth surface has failure modes such as gluing, wear and plastic deformation

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