Herringbone planetary gear transmission device with constant meshing characteristics constructed tooth pair

A herringbone planetary gear transmission device with a constant meshing characteristics constructed tooth pair, comprising a sun gear (1) with a constructed tooth pair, a planetary gear (2) with a constructed tooth pair and an internal gear (3) with a constructed tooth pair based on conjugate curves, wherein a normal tooth profile curve Γs1 of the sun gear (1) with a constructed tooth pair, a normal tooth profile curve Γs2 of the planetary gear (2) with a constructed tooth pair and a normal tooth profile curve Γs3 of the internal gear (3) with a constructed tooth pair are continuous combined curves ΓL with the same curve shape, and the continuous combined curves ΓL comprise a combined curve ILI of an odd power function curve and a tangent at an inflection point thereof;

• the continuous combined curve is formed by two continuous curves, a connection point of the two continuous curves is an inflection point or a tangent point of the continuous combined curve, and the inflection point or the tangent point of the continuous combined curve is a designated point located on a meshing force action line of a gear pair;
• and normal tooth profiles are swept along given conjugate curves to obtain tooth surfaces of the sun gear (1) with a constructed tooth pair, the planetary gear (2) with a constructed tooth pair and the internal gear (3) with a constructed tooth pair;
• wherein when the continuous combined curve ΓL is the combined curve ΓL1 of the odd power function curve and the tangent at the inflection point thereof, the continuous combined curve IL is formed by an odd power function curve ΓL12 and a tangent ΓL11 at an inflection point of the odd power function curve;
• a rectangular coordinate system is established at the tangent point of the continuous combined curve, and an equation of the combined curve ILI of the odd power function curve and the tangent at the inflection point thereof is as follows:
• {
• Γ
• L
• ⁢
• 11
• :
• x
• 10
• =
• t
• ,
• y
• 10
• =
• 0
• ⁢
• (
• t
• 1
• ≤
• t
• <
• 0
• )
• Γ
• L
• ⁢
• 12
• :
• x
• 10
• =
• t
• ,
• y
• 10
• =
• At
• 2
• ⁢
• n
• -
• 1
• ⁢
• (
• 0
• ≤
• t
• ≤
• t
• 2
• )
• ,
• wherein x10 and y10 are x-axis and y-axis coordinate values of the combined curve in the rectangular coordinate system, respectively;
• a parameter t is an independent variable of the equation;
• t1 and t2 are value ranges of the continuous curve;
• A is a coefficient of the equation;
• and n is a degree of the independent variable and is a positive integer.