External meshing cylindrical gear pair with constant meshing characteristics constructed tooth pair

Patent metadata

Field	Value
Publication number	US-12352347-B2
Application number	US-202418653586-A
Country	US
Kind code	B2
Filing date	May 2, 2024
Priority date	May 31, 2023
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

Provided is an external meshing cylindrical gear pair with a constant meshing characteristics constructed tooth pair. The external meshing cylindrical gear pair with a constructed tooth pair includes a cylindrical gear I with a constructed tooth pair and a cylindrical gear II with a constructed tooth pair based on conjugate curves. In the present disclosure, normal tooth profile curves of the cylindrical gear I with a constructed tooth pair and the cylindrical gear II with a constructed tooth pair are continuous combined curves with the same curve shape, which facilitates machining by the same cutter. A common normal at an inflection point or a tangent point of the continuous combined curve passes through a pitch point of the gear pair, and a position of the inflection point or the tangent point can be adjusted according to an actual demand. A contact ratio is designed as an integer.

First claim

What is claimed is:

1. An external meshing cylindrical gear pair with a constant meshing characteristics constructed tooth pair, comprising a cylindrical gear I with a constructed tooth pair and a cylindrical gear II with a constructed tooth pair as a pair based on conjugate curves, wherein a normal tooth profile curve Γ s1 of the cylindrical gear I with a constructed tooth pair and a normal tooth profile curve Γ s2 of the cylindrical gear II with a constructed tooth pair are continuous combined curves Γ L with the same curve shape, and the continuous combined curve Γ L is a combined curve Γ L1 of an odd power function curve and a tangent at an inflection point thereof, a combined curve Γ L2 of a sine function curve and a tangent at an inflection point thereof, a combined curve Γ L3 of an epicycloid function curve and a tangent at an inflection point thereof, a combined curve Γ L4 of an odd power function, a combined curve Γ L5 of a sine function, or a combined curve Γ L6 of an epicycloid function; the continuous combined curve Γ L 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 Γ L , and the inflection point or the tangent point of the continuous combined curve Γ L is a designated point located on a meshing force action line of the external meshing cylindrical gear pair with a constant meshing characteristics constructed tooth pair; the normal tooth profile curve Γ s1 of the cylindrical gear I with a constructed tooth pair is swept along given conjugate curves to obtain a tooth surface of the cylindrical gear I with a constructed tooth pair, and the normal tooth profile curve Γ s2 of the cylindrical gear II with a constructed tooth pair is swept along the given conjugate curves to obtain a tooth surface of the cylindrical gear II with a constructed tooth pair.

2. The external meshing cylindrical gear pair with a constant meshing characteristics constructed tooth pair according to claim 1 , 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 Γ L comprises 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 Γ L , and an equation of the combined curve Γ L1 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 continuous combined curve Γ L 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 combined curve Γ L ; A is a coefficient of the equation; and n is a degree of the independent variable and is a positive integer.

3. The external meshing cylindrical gear pair with a constant meshing characteristics constructed tooth pair according to claim 1 , wherein when the continuous combined curve Γ L is the combined curve Γ L2 of the sine function curve and the tangent at the inflection point thereof, the continuous combined curve Γ L comprises a sine function curve Γ L22 and a tangent Γ L21 at an inflection point of the sine function curve; a rectangular coordinate system is established at the tangent point of the continuous combined curve Γ L , and an equation of the combined curve Γ L2 of the sine function curve and the tangent at the inflection point thereof is as follows:

{

Γ

L
⁢
21

:

x
20

=

Assignees

• Univ Chongqing
• Chongqing Yisilun Tech Co Ltd

Inventors

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

Classifications

• F16H55/088

  with corrections on tip or foot of the teeth, e.g. addendum relief for better approach contact · CPC title

• F16H2055/0893

  for parallel shaft arrangement of toothed members · CPC title

• F16H2055/0866

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

• F16H2055/086

  Silent gear profiles · CPC title

• F16H55/17 Primary

  Toothed wheels (worm wheels F16H55/22; chain wheels F16H55/30) · CPC title