A kind of oblique tooth surface gear transmission pair and tooth width geometric design method

Abstract

The invention discloses a helical tooth surface gear transmission pair and a tooth width geometric design method. The helical flank gear is staggered with a straight-tooth involute shaper. This kind of helical flank gear can only mesh with the spur gear, but cannot mesh with the helical gear with a helical angle. The tooth line is approximately an oblique line and forms an oblique angle with the radial direction, which is very suitable for the design diversification of the aviation compact space. The invention clarifies the tooth-shaping principle of the helical tooth surface gear of the helical gear, deduces the tooth surface equation of the helical tooth surface gear; uses the limit line of the involute gear shaper to find the position of the tangent point of the root of the inner end tooth ; Through the condition that the tooth thickness of the outer end tip is equal to zero, the condition of sharpening is obtained; then combined with the condition of avoiding the secondary cutting of the tooth root, the radius of the tip fillet is determined, and the tooth width of the helical flank gear is finally obtained.

Description

【Technical field】 [0001] The invention belongs to the technical field of gear transmission, and in particular relates to a transmission pair of inclined tooth surface gears and a geometric design method of tooth width. 【Background technique】 [0002] The oblique tooth surface gear transmission is an angular transmission in which a cylindrical gear meshes with a flat inclined tooth surface gear, and can be used for different transmission requirements such as orthogonal, non-orthogonal or offset axes of the two gears. Compared with the angular transmission using bevel gears, the oblique tooth surface gear transmission can save a lot of installation and debugging time and cost due to the relatively free position of the active cylindrical gear. In addition, it has many advantages such as compact structure and high single-stage transmission ratio. Finished oblique tooth surface gears can replace straight bevel gears, spiral bevel gears and hypoid bevel tooth surface gears, etc. a...

AI Technical Summary

Problems solved by technology

Compared with straight-toothed helical-toothed gears, helical-toothed-toothed-toothed gears have higher coincidence and tooth strength; however, due to the existence of the helix angle, the tooth surface geometry is more complex, even for small installations Errors may destroy the original ideal meshing marks; what is more unfavorable is that the axial force will be generated in the meshing transmission, thus improving the performance requirements of the bearing and more stringent installation conditions

With the increasing application of high-power transmission systems in aviation power transmission, the traditional involute spur gears and helical gears can no longer adapt to high-speed and heavy-duty transmission occasions. Therefore, it is urgent to develop suitable A new type of high-performance helical tooth surface gear transmission for high power transmission

[0004] To sum up, straight teeth with inclined tooth surface gears have problems such as low coincidence, poor load carrying capacity, and large vibration and noise, while helical tooth inclined tooth surface gears have disadvantages such as axial force and poor meshing stability. Moreover, the geometrical design of the tooth width of the oblique tooth surface gear is not comprehensive, and only considers the undercutting of the inner end dedendum and the sharpening of the outer end addendum tip

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