Tooth profile of pin gear in pin gear transmission

Abstract

The invention relates to a tooth profile of a pin gear in pin gear transmission, and aims to solve the problems that a starting point of a conjugate tooth profile curve of a pin gear in the prior art is above a pitch circle, at the moment, the curvature radiuses located on the pitch circle and near the pitch circle are smaller transition circular arc radiuses, and according to the Hertz theory and the basic law of tooth profile meshing, greater adverse effects are generated during the meshing of the section, therefore, the bearing capacity and the transmission performance of the pin tooth transmission are influenced. According to the scheme, a section of conjugate tooth profile curve is formed by the pitch circle and the section above the pitch circle, the curve participating in meshing is always the conjugate tooth profile curve, the strength checking calculation is accurate, the comprehensive curvature radius of the curve is far larger than an existing fixed value 1.5 d, the tooth profile transition curve has the large curvature radius, and the bending strength of the tooth root part is improved; and due to the fact that the pin gear and a pin wheel operate in a correct track, the bearing capacity, the transmission stability, the service life and the transmission efficiency are improved, the low-speed and heavy-load transmission performance of the pin gear is brought into full play, and speed-up transmission of the pin wheel serving as a driving wheel is facilitated.

Description

technical field [0001] The invention relates to a tooth profile of a pin gear in a pin-tooth transmission, which is used for the design of the tooth profile of the pin gear in the pin-tooth transmission. Background technique [0002] Pin-tooth transmission has three transmission types: internal, external and rack, all of which belong to conjugate meshing. It is mainly used for low-speed and heavy-duty mechanical transmission and occasions with harsh environments such as dusty and poor lubrication conditions. Compared with the large-diameter gear transmission, the pin-tooth transmission has the advantages of simple structure, easy processing, low cost, and convenient disassembly and repair. The quality of its operation is directly related to the reliability and service life of the pin-tooth transmission. At present, the starting point of the conjugate tooth profile curve of the pin gear is above the pitch circle, and the curve participating in the meshing is a smooth curve fo...

AI Technical Summary

Problems solved by technology

like figure 1 As shown, the radius of curvature at the pitch circle and its vicinity is relatively small at this time. According to the Hertz theory and the basic law of tooth profile meshing, a larger contact stress is generated when meshing at the pitch circle and its vicinity. The load carried by the circle is relatively large, which makes this section prone to pitting and wear on the tooth surface. At this time, the tooth profile transition arc curve belongs to the non-conjugate tooth profile curve, and the tooth profile transition arc radius R′ is the same as that in the design manual. The pin wheel circular pin tooth diameter d (radius r) is selected within a certain range, and the radius of curvature at the contact point of the pin gear tooth is related to the fixed value ρ of the pin wheel circular pin tooth diameter d 1 = 1.5d, so the contact strength check is not accurate enough, it is difficult to meet the low-speed and heavy-load working conditions of the pin-tooth transmission, which further aggravates the wear of the pin gear and the round pin teeth of the pin wheel, so that the entire pin-tooth transmission fails in advance; due to the When the circle and the nearby section mesh, the contact stress is relatively large, which makes the tooth surface of this section prone to large sliding friction, resulting in the reduction of the transmission efficiency of the pin tooth transmission and the loosening and falling off of the pin wheel circular pin teeth on the rim, thus Affect the stability, service life and carrying capacity of the pin tooth transmission

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