A kind of worm with double involute arc tooth profile

Abstract

The invention discloses a worm provided with a double-involute-arc tooth profile and belongs to the technical field of worm wheel and worm transmission. The worm comprises a worm body and a worm tooth part. The worm tooth part is arranged in the middle of the worm body. The tooth profile of the cross section of the worm tooth part is in an involute arc shape. The tooth profile of the shaft cross section of the worm tooth part is also in an involute arc shape, thus, the worm composite arc tooth profile is formed and matched with a worm wheel tooth profile, the worm composite arc tooth profile is provided with an oil containing gap in the reference circle, and the portions close to the upper side and the lower side of the reference circle are in smooth coincidence contact along the worm wheel tooth profile to achieve meshing transmission. By means of selection and recombination of two involute arc segments of the cross section and the shaft cross section, the contact area can be increased, and contact stress is reduced. Meanwhile, oil containing space distribution is more reasonable, power of a transmission pair is increased, lubricating performance of the transmission pair is improved, multiple adverse factors in worm wheel and worm transmission are reduced greatly, and the application effect is improved.

Description

technical field [0001] The invention relates to the technical field of worm gear transmission, and more specifically relates to a worm with a double involute arc tooth profile. Background technique [0002] As an ancient basic form of transmission, worm gear transmission has been used for hundreds of years. In practical applications, worm gear transmission has the advantages of large transmission ratio, compact structure and self-locking, but also has the disadvantages of low transmission efficiency and large wear. It is widely used in low-speed and heavy-duty reduction transmissions. The torus Since the worm paired helical gear type worm gear was invented and applied by the British Hendry in the 19th century, it has been used in many heavy-duty occasions due to its multi-tooth meshing load capacity, which is much greater than that of ordinary cylindrical worms. For multi-tooth enveloping meshing, the problems of low efficiency and high wear are more prominent when the degr...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low transmission efficiency, large wear and poor lubricating effect of existing worm gears and worms, the present invention provides a worm with a double involute arc-shaped tooth profile, the cross-section of the worm and the tooth profile of the shaft section are the same as those of the worm gear The involutes that match the tooth profile, the compound arc tooth profile, the contact during meshing is almost a line contact along the entire length direction, and while increasing the contact area and reducing the contact stress, there is also a contact area near the contact area. The oil holding gap allows the lubricating oil to adhere, improves the lubrication performance of the transmission pair, greatly reduces the unfavorable factors of the worm gear transmission, and improves the application effect

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