Convex-concave meshing pure rolling spiral bevel gear mechanism for cross shaft transmission

Abstract

The invention provides a convex-concave meshing pure rolling spiral bevel gear mechanism for cross shaft transmission. The convex-flat meshing pure rolling spiral bevel gear mechanism comprises a small gear and a large gear, and the small gear and the large gear form a transmission pair. The small gear is fixedly connected with a drive through an input shaft, and the large gear is connected with an output shaft. The axis of the small gear intersects with the axis of the large wheel, and n1 uniformly distributed convex spiral circle-arc teeth are arranged on the outer surface of a cone of the small gear. The center lines of all the spiral circle-arc teeth are equal pitch conical spiral lines, and transitional fillets are arranged between the spiral circle-arc teeth and the outer surface ofthe cone of the small gear. n2 uniformly distributed spiral arc grooves are formed in the outer surface of a cone of the large gear, and the center lines of all the spiral arc grooves are equal pitchconical spiral lines. Transitional fillets are arranged between the spiral arc grooves and the outer surface of the cone of the large gear, and the engagement system of the spiral circle-arc teeth ofthe small gear and the spiral arc grooves of the large gear is pure rolling meshing transmission of point contact. The convex-flat meshing pure rolling spiral bevel gear mechanism for the cross shafttransmission has the beneficial effects that transmission efficiency is high, contact ratio is large, carrying capacity is high, and the convex-flat meshing pure rolling spiral bevel gear mechanism for the cross shaft transmission can be widely applied to the fields of small, micro machines and conventional machines which are not easy to lubricate.

Description

technical field [0001] The invention relates to a bevel gear transmission device, in particular to a convex-concave engagement pure rolling helical 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. [0003] At present, the main problem facing my country's gear industry is the obvious lack of design and manufacturing capabilities for high-efficiency, large-carrying capacity, lightweight, and high-reliability high-performance gear products. The traditional spur gears, helical gears and bevel gear pairs widely used in the field of industrial production and manufacturing have never completely ...

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 convex-concave 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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