Constant velocity joint

Patent metadata

Field	Value
Publication number	US-12398762-B2
Application number	US-202217866781-A
Country	US
Kind code	B2
Filing date	Jul 18, 2022
Priority date	Aug 5, 2021
Publication date	Aug 26, 2025
Grant date	Aug 26, 2025

Abstract

A constant velocity joint includes an outer part having a connecting portion and an opening portion and a plurality of axial grooves forming outer raceways, and an inner part having a plurality of axial grooves forming inner raceways. Each outer raceway and inner raceway form a raceway pair, a ball being disposed in each raceway pair. Each raceway pair defines a region in axial cross-section with respect to a groove longitudinal axis conceptually divided into four quadrants. The outer raceway is in the first and second quadrants and the inner raceway is in the third and fourth quadrants. With torque transmission in a first direction, the ball has two contact points in the first quadrant and/or two contact points in the third quadrant, and with torque transmission in a second direction, the ball has two contact points in the second quadrant and/or two contact points in the fourth quadrant.

First claim

We claim:

1. A constant velocity joint comprising:
a joint outer part having a connecting portion and an opening portion, the opening portion having a plurality of axially extending grooves, each groove providing an outer ball raceway;
a joint inner part having a plurality of axially extending grooves, each groove of the joint inner part providing an inner ball raceway, each one of the outer ball raceways and a separate one of the inner ball raceways forming one of a plurality of raceway pairs; and
a plurality of balls, each ball being disposed within a separate one of the plurality of raceway pairs;
wherein the outer ball raceway and the inner ball raceway of each raceway pair define a region that, in a cross-section with respect to a longitudinal axis of each groove, is conceptually divided into four quadrants;
wherein the outer ball raceway is disposed in a first quadrant and a second quadrant and the inner ball raceway is disposed in a third quadrant and a fourth quadrant;
wherein with a torque transmission of the constant velocity joint in a first direction, each ball has two simultaneous contact points in the first quadrant and/or two simultaneous contact points in the third quadrant; and/or
wherein with a torque transmission of the constant velocity joint in a second direction, each ball has two simultaneous contact points in the second quadrant and/or two simultaneous contact points in the fourth quadrant.

2. The constant velocity joint according to claim 1 , wherein at least one of:
the outer ball raceway has a first radius of curvature and a second radius of curvature in the first quadrant, each one of the first radius of curvature and the second radius of curvature having a separate center point, the center point of the first radius and the center point of the second radius being offset with respect to each other; and
the outer ball raceway has a third radius of curvature and a fourth radius of curvature in the second quadrant, each one of the third radius of curvature and the fourth radius of curvature having a separate center point, the center point of the third radius and the center point of the fourth radius being offset with respect to each other.

3. The constant velocity joint according to claim 2 , wherein:
the first radius of curvature and the second radius of curvature are each configured such that one of the two contact points in the first quadrant lies in a region of the first radius of curvature and the other of the two contact points in the first quadrant lies in a region of the second radius of curvature; and/or
the third radius of curvature and the fourth radius of curvature are each configured such that one of the two contact points in the second quadrant lies in the region of the third radius of curvature and the other of the two contact points in the second quadrant lies in the region of the fourth radius of curvature.

4. The constant velocity joint according to claim 2 , wherein:
the two contact points in the first quadrant of the outer ball raceway are disposed in a range of ±10° about a transition between the first radius of curvature and the second radius of curvature; and/or
the two contact points in the second quadrant of the outer ball raceway are disposed in a range of ±10° about a transition between the third radius of curvature and the fourth radius of curvature.

5. The constant velocity joint according to claim 2 , wherein:
the first quadrant of the outer ball raceway is divided by the first radius of curvature and the second radius of curvature into two identical parts; and/or
the second quadrant of the outer ball raceway is divided by the third radius of curvature and the fourth radius of curvature into two identical parts.

6. The constant velocity joint according to claim 1 , wherein at least one of:
the inner ball raceway has a first radius of curvature and a second radius of curvature in the third quadrant, each one of the first radius of curvature and the second radius of curvature having a separate center point, the center point of the first radius and the center point of the second radius being offset with respect to each other; and
the inner ball raceway has a third radius of curvature and a fourth radius of curvature in the fourth quadrant, each one of the third radius of curvature and the fourth radius of curvature having a separate center point, the center point of the third radius and the center point of the fourth radius being offset with respect to each other.

7. The constant velocity joint according to claim 6 , wherein:
the first radius of curvature and the second radius of curvature are each configured such that one of the two contact points in the third quadrant lies in a region of the first radius of curvature and the other of the two contact points in the third quadrant lies in a region of the second radius of curvature; and/or
the third radius of curvature and the fourth radius of curvature are each configured such that one of the two contact points in the fourth quadrant lies in the region of the third radius of curvature and the other of the two contact points in the fourth quadrant lies in the region of the fourth radius of curvature.

8. The constant velocity joint according to claim 6 , wherein:
the two contact points in the third quadrant of the inner ball raceway are disposed in a range of ±10° about a transition between the first radius of curvature and the second radius of curvature; and/or
the two contact points in the fourth quadrant of the inner ball raceway are disposed in a range of ±10° about a transition between the third radius of curvature and the fourth radius of curvature.

9. The constant velocity joint according to claim 6 , wherein:
the third quadrant of the inner ball raceway is divided by the first radius of curvature and the second radius of curvature into two identical parts; and/or
the fourth quadrant of the inner ball raceway is divided by the third radius of curvature and the fourth radius of curvature into two identical parts.

Assignees

• Skf Ab

Inventors

• Schmitz Tom
• Rippstein Klaus Dietmar
• Baierl Lisa
• Schulz Ingo

Classifications

• Y10S464/906

  Torque transmitted via radially spaced balls · CPC title

• F16D3/224

  the groove centre-lines in each coupling part lying on a sphere · CPC title

• F16D2003/22309

  Details of grooves · CPC title

• F16D2003/22303

  Details of ball cages · CPC title

• F16D3/2245 Primary

  where the groove centres are offset from the joint centre · CPC title