Plunging type constant velocity universal joint for rear-wheel drive shaft

Patent metadata

Field	Value
Publication number	US-11359677-B2
Application number	US-201816494393-A
Country	US
Kind code	B2
Filing date	Mar 8, 2018
Priority date	Mar 17, 2017
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

Abstract

A plunging type constant velocity universal joint includes an outer joint member, an inner joint member, eight balls, and a cage. A curvature center of a spherical portion of an outer peripheral surface of the cage and a curvature center of a spherical portion of an inner peripheral surface of the cage are offset to opposite sides in the axial direction with respect to a joint center by an equal distance. A ratio PCDBALL/DBALL of a pitch circle diameter PCDBALL of the balls to a diameter DBALL of each of the balls is set from 3.3 to 3.6. A ratio TI/DBALL of a radial thickness TI of the inner joint member to the diameter DBALL of each of the balls is set from 0.30 to 0.45.

First claim

The invention claimed is:

1. A plunging type constant velocity universal joint for a rear-wheel drive shaft, the plunging type constant velocity universal joint comprising:
an outer joint member having a cylindrical inner peripheral surface in which eight track grooves extending in an axial direction of the plunging type constant velocity universal joint are formed;
an inner joint member having a spherical outer peripheral surface in which eight track grooves extending in the axial direction are formed, and having a spline hole formed along an axial center of the inner joint member;
eight balls arranged in ball tracks formed by the track grooves of the outer joint member and the track grooves of the inner joint member; and
a cage, which has eight pockets configured to receive the balls, and is held in slide contact with the cylindrical inner peripheral surface of the outer joint member and the spherical outer peripheral surface of the inner joint member,
wherein a curvature center of a spherical portion formed on an outer peripheral surface of the cage and a curvature center of a spherical portion formed on an inner peripheral surface of the cage are offset to opposite sides in the axial direction with respect to a joint center by an equal distance,
wherein a ratio PCD BALL /D BALL of a pitch circle diameter PCD BALL of the balls to a diameter D BALL of each of the balls is set from 3.3 to 3.6,
wherein a ratio T I /D BALL of a radial thickness T I of the inner joint member to the diameter D BALL of each of the balls is set from 0.30 to 0.45, and
wherein a ratio PCD SPL /D BALL of a pitch circle diameter PCD SPL of the spline hole of the inner joint member to the diameter D BALL of each of the balls is set from 1.70 to 1.85.

2. The plunging type constant velocity universal joint according to claim 1 , wherein a ratio D O /PCD SPL of an outer diameter D O of the outer joint member to the pitch circle diameter PCD SPL of the spline hole of the inner joint member is set from 2.7 to 3.0.

3. The plunging type constant velocity universal joint according to claim 1 , wherein the plunging type constant velocity universal joint has a maximum operating angle of 20° or less.

4. The plunging type constant velocity universal joint according to claim 1 , wherein a ratio W I /D BALL of an axial width W I of the inner joint member to the diameter D BALL of each of the balls is set from 1.2 to 1.55.

5. The plunging type constant velocity universal joint according to claim 1 , wherein a ratio W C /D BALL of an axial width W C of the cage to the diameter D BALL of each of the balls is set from 1.8 to 2.0.

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• Kobayashi Masazumi
• Kobayashi Tomoshige

Classifications

• Y10S464/906

  Torque transmitted via radially spaced balls · CPC title

• F16D2003/22313

  Details of the inner part of the core or means for attachment of the core on the shaft · CPC title

• F16D3/2245

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

• F16D3/227 Primary

  the joints being telescopic · CPC title