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Arc tooth surface gear pair and method of processing the same

A face gear and arc tooth technology, which is applied to the arc tooth surface gear pair and its processing field, can solve the problems of high processing cost, concentrated contact stress, and it is difficult for ordinary machine tools and tools to process teeth, and achieve good meshing performance. , The effect of improved bending strength and low noise

Inactive Publication Date: 2010-05-19
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the problems of spur gear transmission and helical gear transmission edge contact, the contact stress is too concentrated, the processing cost is high, ordinary machine tools and cutting tools are difficult to realize processing and tooth grinding, etc., based on the theory of face gear meshing transmission, the present invention A transmission pair of arc tooth surface gear and its processing method are proposed

Method used

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  • Arc tooth surface gear pair and method of processing the same
  • Arc tooth surface gear pair and method of processing the same
  • Arc tooth surface gear pair and method of processing the same

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Embodiment approach 1

[0031] Design conditions: arc tooth surface gear (9) and symmetrical arc cylindrical gear (8) axis intersection angle γ = 80°, modulus m = 3.715mm, pressure angle α = 25°, transmission ratio i 12 = 3.821. The offset distance between the two axes is E=0.

[0032] 1. Reference design scheme

[0033] This embodiment is to design the transmission pair of arc tooth surface gear under no-load condition. After calculation, the geometric parameters of the small wheel, i.e. the symmetrical arc cylindrical gear (8) at the symmetrical central section are as follows: modulus m=3.715mm, pressure angle α=25°, maximum helix angle β=25°, number of teeth z 1 =28, pitch circle diameter d 1 =104.02mm, addendum height coefficient Headspace coefficient c * =0.25, addendum height h a =3.715mm, dedendum height h f =4.644mm, total tooth height h=8.359mm, diameter of addendum circle d a =111.45mm, root circle diameter d f =94.7325mm, base circle diameter d b =94.274mm, tooth width b 1 = 10...

Embodiment approach 2

[0046] Design conditions: the shaft intersection angle between the curved tooth surface gear and the symmetrical curved cylindrical gear is γ=90°, the modulus m=2.54mm, the pressure angle α=25°, the transmission ratio i 12 =5, the offset distance between the two axes is E=0.

[0047] 1. Design plan

[0048] Design two-wheel installation axis offset distance E=0. Wherein the small wheel, that is, the symmetrical arc cylindrical gear (8) is designed as follows at the geometrical parameters of the symmetrical central section: modulus m=2.54mm, pressure angle α=25°, maximum helix angle β=25°, select the number of teeth z 1 =20, indexing circle diameter d 1 =50.8mm, addendum height coefficient Headspace coefficient c * =0.25, addendum height h a =2.54mm, dedendum height h f =3.175mm, total tooth height h=5.715mm, diameter of addendum circle d a =55.88mm, root circle diameter d f =44.45mm, base circle diameter d b =46.04mm, tooth width b 1 = 50.1 mm. The big wheel is the...

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Abstract

The invention relates to an arc tooth-surface gear pair, comprising an arc tooth-surface gear (9) and a symmetric arc cylindrical gear (8) which are meshed with each other. The geometric shapes of thearc tooth-surface gear (9) and the symmetric arc cylindrical gear (8) are in arc tooth form along the direction of tooth length, and the arc directions of the two gears are the same. The tooth-form helix angle of the arc tooth-surface gear (9) is zero at the midpoint of the tooth width, and becomes bigger gradually along the tooth length to both ends. The pressure angle at the midpoint of the tooth width equals to a cutter tooth-form angle, and the size of the pressure angle changes along with the change of the section position. The tooth form of the symmetric arc cylindrical gear (8) is an involute tooth form on the central symmetric section along the direction of the tooth width, and the helix angle is zero. The pressure angle equals to a cutter tooth-form angle. The concave and the convex of two gears are contacted with each other during transmission, so that the point contact between two tooth surfaces at the center of the tooth width is ensured. The arc tooth-surface gear pair has the advantages of big bearing capacity, high transmission efficiency, good meshing performance, smooth operation, convenient manufacture, and broad application prospect.

Description

(1) Technical field [0001] The invention relates to the field of transmission machinery, in particular to an arc tooth surface gear pair and a processing method thereof. (2) Background technology [0002] Face Gear Drive is a gear transmission in which a cylindrical gear and a bevel gear are meshed, and it can be applied to occasions where the axes of the two wheels are orthogonal or non-orthogonal. When the axes of the two wheels are orthogonal, that is, when the shaft angle γ=90°, the teeth of the bevel gear will be distributed on a circular plane, and the bevel gear will become a face gear, which is generally called a face gear transmission. Due to the uniqueness of the face gear pair in the split-merge transmission, its application in the aviation field shows potential advantages. Compared with the traditional spiral bevel gear splitter-convergence transmission device, the face gear diverter-merge device has a simplified structure, a 22% reduction in weight, and a 35% i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H55/17B23F9/08
Inventor 方宗德沈云波
Owner NORTHWESTERN POLYTECHNICAL UNIV