Design method for tooth profile of double-base cone spiral bevel gear

Abstract

The invention provides a design method for a tooth profile of a double-base cone spiral bevel gear and relates to gears. According to the double-base cone spiral bevel gear, five conical surfaces, four cone angles and two base cones are arranged; the normal tooth profile of each gear tooth comprises an addendum circle, a root circle, a driving side tooth curve, a non-driving side tooth curve and a tooth directional line; the five cone surfaces are a surface cone, a root cone, a pitch cone, a back cone and a front cone respectively; the four cone angles are a face angle, a root angle, a pitch angle and a back angle respectively; for vehicles with gear transmission mechanisms mainly depending on one-way transmission, the property of the spiral bevel gear is improved; the design method for the tooth profile of the double-based cone spiral bevel gear provided by the invention has the advantages that as large tooth profile angles are adopted in the driving surface and small tooth profile angles are adopted in the non-driving surface, the bearing capacity of the gear in the driving direction is increased and the top of tooth is prevented from being tapered, the bearing capacity, fatigue life and output torque of the spiral bevel gear are improved effectively and the vibration and noise in the transmission are reduced.

Description

technical field [0001] The invention relates to gears, in particular to a method for designing the tooth profile of a double base bevel spiral bevel gear. Background technique [0002] Compared with straight and helical bevel gears, spiral bevel gears have the advantages of large coincidence, large relative curvature radius of the tooth surface at the contact point, easy control of the surface contact area, and less sensitivity to errors. In the transmission, it has been widely used. With the development trend of high speed and heavy load in gear transmission, the traditional spiral bevel gear has been difficult to meet the requirements of the equipment. Especially in vehicle transmission components, the requirements for the output torque of spiral bevel gears are getting higher and higher. [0003] When the tooth profile angle increases, the bending load capacity and contact load capacity of the gear are significantly enhanced, but as the tooth profile angle increases, th...

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Problems solved by technology

[0003] When the tooth profile angle increases, the bending load capacity and contact load capacity of the gear are significantly enhanced, but as the tooth profile angle increases, the tooth top of the gear gradually becomes sharper. When the tooth top thickness is less than 1.5m (m is the gear mold number), the top of the tooth is easy to break when loaded, resulting in gear transmission failure (Li Huamin, Quality Index Analysis of Large Tooth Profile Angle Involute Gear Transmission, Journal of Harbin Institute of Technology, 1987, Z1:86-98)

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