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

Patent metadata

Field	Value
Publication number	US-12313147-B2
Application number	US-202418658948-A
Country	US
Kind code	B2
Filing date	May 8, 2024
Priority date	May 31, 2023
Publication date	May 27, 2025
Grant date	May 27, 2025

Abstract

Provided is a herringbone planetary gear transmission device with a constant meshing characteristics constructed tooth pair, which relates to the technical field of gear transmission. The transmission device includes a sun gear with a constructed tooth pair, a planetary gear with a constructed tooth pair and an internal gear with a constructed tooth pair based on conjugate curves. Normal tooth profiles of the gears with a constructed tooth pair in the present disclosure are all the same combined curve and can be machined by using the same cutter. A common normal at an inflection point or a tangent point of the curve passes through a pitch point of a meshing gear pair, and a sliding ratio of the meshing gear pair is adjusted according to an adjusted position of the inflection point or the tangent point. A contact ratio of the meshing gear pair is designed as an integer.

First claim

What is claimed is:

1. 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 Γ s1 of the sun gear (1) with a constructed tooth pair, a normal tooth profile curve Γ s2 of the planetary gear (2) with a constructed tooth pair and a normal tooth profile curve Γ s3 of the internal gear (3) with a constructed tooth pair are continuous combined curves Γ L with the same curve shape, and the continuous combined curves Γ L 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 Γ L is the combined curve Γ L1 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 Γ L12 and a tangent Γ L11 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 x 10 and y 10 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; t 1 and t 2 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.

2. The herringbone planetary gear transmission device with a constant meshing characteristics constructed tooth pair according to claim 1 , wherein a curve equation of the normal tooth profile curve Γ s1 of the sun gear (1) with a constructed tooth pair obtained by rotating the continuous combined curve Γ L around an origin of the rectangular coordinate system by an angle α 1 is as follows:

{

x
01

=

x

n
⁢

0

⁢
cos
⁢

α
1

-

y

n
⁢

Assignees

• Univ Chongqing
• Chongqing Yisilun Tech Co Ltd

Inventors

• Chen Bingkui
• Tian Chao
• Zhang Luhe
• Peng Changyan
• Luo Wenjun
• Li Chaoyang
• Chen Yonghong

Classifications

• F16H2055/0893

  for parallel shaft arrangement of toothed members · CPC title

• F16H55/08 Primary

  Profiling · CPC title

• F16H2055/176

  Ring gears with inner teeth · CPC title

• F16H2001/289

  comprising two or more coaxial and identical sets of orbital gears, e.g. for distributing torque between the coaxial sets · CPC title

• F16H2055/0866

  Profiles for improving radial engagement of gears, e.g. chamfers on the tips of the teeth · CPC title