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A Modification Method of Involute Tooth Profile in Harmonic Drive

An involute tooth, harmonic drive technology, applied in the direction of the transmission device, components with teeth, belt/chain/gear, etc., can solve the problems of unfavorable oil film, cusp contact, poor meshing performance, etc. Performance, increased number of teeth, small meshing backlash effect

Active Publication Date: 2020-05-22
国茂精密传动(常州)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in harmonic gear transmission, the flexible spline frequently meshes in and out of the steel wheel, and the meshing track is similar to a cycloid, resulting in poor meshing performance of ordinary involute gears in harmonic transmission, and there is a sharp point contact phenomenon in the meshing process , is not conducive to the formation of oil film
The traditional involute tooth profile modification method is based on the basic meshing theorem of Willis gears, which is suitable for fixed shaft transmission and not suitable for harmonic gear transmission.

Method used

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  • A Modification Method of Involute Tooth Profile in Harmonic Drive
  • A Modification Method of Involute Tooth Profile in Harmonic Drive
  • A Modification Method of Involute Tooth Profile in Harmonic Drive

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Embodiment 1

[0113] The following is a specific calculation combined with the modification curve of a specific flexspline gear. The main parameters are selected as follows: the number of flexible gear teeth z=60, the modulus m=1.3, the pressure angle α 0 =20°, addendum height coefficient Then β 0 = π / 2z = 0.0262, θ 0 =tanα 0 -α 0 = 0.0149. Let the maximum modification amount and modification length of the harmonic involute tooth profile modification be Δ max =0.2m=0.26, The parametric equation of the involute in the coordinate system XOY is

[0114]

[0115] Among them, the base circle radius

[0116] The equation in the addendum circle coordinate system XOY is

[0117]

[0118] Among them, the radius of the addendum circle

[0119] Simultaneous involute and addendum circle equations can be obtained

[0120]

[0121] Thus, the rolling angle φ of point K is obtained K for

[0122]

[0123] Therefore, the length of arc KA is

[0124]

[0125] Similarly, the...

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Abstract

The invention discloses a modification method for a harmonic driving involute profile. A point B serves as a point of tangency of a modification curve and a involute tooth surface. A point E serves asa point of intersection of the modification curve and an involute addendum circle. A coordinate system XOY is built with a radial OA as the abscissa axis. A coordinate system X1OY1 is built with a radial OC as the ordinate axis. After the steps of determining the coordinates of the point B and the point E in the coordinate system X1OY1 and the slope of a tangent of the involute at the point B, determining a flexible gear central point approximate movement track curvilinear equation, determining the parameter equation of the modification curve in the coordinate system X1OY1 and the like, a system of simultaneous equations is built and used for solving parameters, and the parameter equation of the modification curve in the coordinate system XOY is obtained through conversion of the coordinate system. According to the modification method, the harmonic driving involute profile is modified based on the harmonic driving kinematics theory, processing manufacturability and economy can be guaranteed, engagement performance is improved, the advantages of various harmonic tooth profiles are integrated, and the modification method can be widely applied to the technical field of harmonic gears.

Description

technical field [0001] The invention relates to the technical field of harmonic gears, in particular to a method for modifying an involute tooth profile of a harmonic drive. Background technique [0002] The involute tooth profile has the advantages of good transmission performance, mature technology, simple processing and manufacturing tools, etc., and is widely used in gear transmission. However, in harmonic gear transmission, the flexible spline frequently meshes in and out of the steel wheel, and the meshing track is similar to a cycloid, resulting in poor meshing performance of ordinary involute gears in harmonic transmission, and there is a sharp point contact phenomenon in the meshing process , which is not conducive to the formation of oil film. The traditional involute tooth profile modification method is based on the basic meshing theorem of Willis gears, which is suitable for fixed shaft transmission and not suitable for harmonic gear transmission. Contents of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H55/08F16H49/00
CPCF16H49/001F16H55/0806F16H55/088
Inventor 陈盛花张杨郑建林
Owner 国茂精密传动(常州)有限公司
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