Teeth part strengthening structure of spiral bevel gear

Abstract

The invention discloses a teeth part strengthening structure of a spiral bevel gear. The strengthening structure is a circle transition structure which is formed by tangency of a circular arc arranged between two adjacent tooth faces and the tooth faces at the two sides. The strengthening structure is characterized in that the midpoint of a circular arc line is tangent to a root circle, and the semidiameter R value of the circular arc is determined by three common tangency points; and the circle transition structure is designed at the tooth root position and has good mechanical property, thereby promoting strengths of bending resistance and cracking resistance of the tooth root and obviously reducing the stress concentration degree. According to the strengthening structure provided by the invention, a strengthening measure can be further implemented from the other two aspects besides the technology effect: firstly, the circle transition structure at the tooth root position provides convenience for adoption of a refined forging shaping process when forging and pressing are carried out, metal fibres are continuously distributed along the height direction of a tooth form, and the tooth part is of a longitudinal metal fibre structure, thereby effectively improving the gliding property of the tooth face and the shock resistance of the tooth part; and secondly, the circle transition structure at the tooth root position has no dead angles so as to conveniently carry out the shot peening strengthening on the tooth part. The strengthening structure provided by the invention has the advantages of reasonable structure and high strength, and is particularly suitable for being matched with a main reduction gear in a heavy vehicle driving axle.

Description

technical field [0001] The invention relates to a gear structure design, and in particular, the invention relates to a tooth part strengthening structure of a spiral bevel gear. Background technique [0002] Spiral bevel gear is a mechanical transmission part with strong load capacity, stable transmission, and low meshing noise. It is widely used in vehicle drive axles as the main reduction gear to drive the wheels on both sides. During the driving process of the vehicle, the load of the spiral bevel gear is affected by factors such as road conditions and load, especially under the condition of low speed and heavy load, the teeth of the spiral bevel gear are subject to greater impact and torque. Once the impact force and torque exceed the design bending strength or shear strength of the spiral bevel gear teeth, it may cause plastic bending or tooth breakage accidents in the teeth. The dedendum of conventionally designed spiral bevel gears has a flat bottom structure, that i...

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Problems solved by technology

[0003] The present invention mainly aims at the problem of insufficient structural strength of the existing spiral bevel gear teeth. On the premise of not changing the material and increasing the manufacturing cost, a kind of strengthening structure of the tooth root of the spiral bevel gear is proposed. Through the strengthening structure design, the tooth root can be significantly improved Service life of spiral bevel gears

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