Friction tubes

Patent metadata

Field	Value
Publication number	US-11320022-B1
Application number	US-202016953723-A
Country	US
Kind code	B1
Filing date	Nov 20, 2020
Priority date	Nov 20, 2020
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

A torsion shaft assembly includes a torque carrying shaft including a driven end configured for receiving torque input to the torque carrying shaft and a driving end configured for outputting torque output from the toque carrying shaft. The torque carrying shaft includes an axial facing damping interface surface axially between the driven end and the driving end. A friction tube is disposed outboard of the torque carrying shaft. The friction tube is connected at a first axial location to be driven by the torque carrying shaft. The friction tube includes an axial facing damping interface surface that abuts the axial facing damping interface surface of the torque carrying shaft, forming a damping interface to provide frictional dampening against angular vibrations occurring as differential angular displacement between the driven end and the driving end of the torque carrying shaft.

First claim

What is claimed is:

1. A torsion shaft assembly comprising:
a torque carrying shaft including a driven end configured for receiving torque input to the torque carrying shaft and a driving end configured for outputting torque output from the toque carrying shaft, wherein the torque carrying shaft includes an axial facing damping interface surface axially between the driven end and the driving end, wherein the torque carrying shaft is hollow defining a fluid passage therethrough; and
a friction tube disposed outboard of the torque carrying shaft, wherein the friction tube is connected at a first axial location to be driven by the torque carrying shaft, and wherein the friction tube includes an axial facing damping interface surface that abuts the axial facing damping interface surface of the torque carrying shaft, forming a damping interface to provide frictional dampening against angular vibrations occurring as differential angular displacement between the driven end and the driving end of the torque carrying shaft.

2. The torsion shaft assembly as recited in claim 1 , further comprising a helical spring engaged with the friction tube to bias the friction tube toward the damping interface.

3. The torsion shaft assembly as recited in claim 1 , wherein the friction tube is engaged with drive flats of the toque carrying shaft.

4. The torsion shaft assembly as recited in claim 3 , wherein the drive flats of the torque carrying shaft are more proximate the driven end of the torque carrying shaft than to the driving end.

5. The torsion shaft assembly as recited in claim 3 , wherein the drive flats of the torque carrying shaft are defined as facets in a radially extending flange of the torque carrying shaft.

6. The torsion shaft assembly as recited in claim 3 , wherein the torque carrying shaft and the friction tube are at least ten times longer than a distance from the driven end of the torque carrying shaft to the drive flats taken in an axial direction.

7. The torsion shaft assembly as recited in claim 1 , wherein the axial facing damping interface surface of the torque carrying shaft is defined on a radially extending flange of the torque carrying shaft.

8. The torsion shaft assembly as recited in claim 7 , wherein the radially extending flange is more proximate the driven end than the driving end.

9. The torsion shaft assembly as recited in claim 8 , wherein the torque carrying shaft and the friction tube are at least ten times longer than a distance from the driving end of the torque carrying shaft to the radially extending flange taken in an axial direction.

10. The torsion shaft assembly as recited in claim 1 , wherein the torque carrying shaft includes one or more bores defined radially therethrough from the fluid passage to an annular space between the torque carrying shaft and the friction tube for passage of fluids between the fluid passage and the annular space.

11. The torsion shaft assembly as recited in claim 10 , wherein the friction tube includes one or more bores defined radially therethrough from the annular space to an exterior of the friction tube for passage of fluids between the annular space and the exterior.

12. The torsion shaft assembly as recited in claim 1 , wherein the friction tube is engaged with drive flats of the toque carrying shaft, wherein the drive flats of the torque carrying shaft are defined as facets in a first radially extending flange of the torque carrying shaft, wherein the axial facing damping interface surface of the torque carrying shaft is defined on a second radially extending flange of the torque carrying shaft.

13. The torsion shaft assembly as recited in claim 12 , further comprising a helical spring engaged with the friction tube on a driven end of the friction tube to bias the friction tube toward the damping interface.

14. The torsion shaft assembly as recited in claim 12 , wherein the torque carrying shaft and the friction tube are at least ten times longer than a distance from the driven end of the torque carrying shaft to the drive flats taken in an axial direction and are at least ten times longer than a distance from the driving end of the torque carrying shaft to the radially extending flange taken in an axial direction.

Assignees

• Hamilton Sundstrand Corp

Inventors

• Cooling Aaron
• Lemmers Jr Glenn C
• Behling David S

Classifications

• F16D3/14 Primary

  combined with a friction coupling for damping vibration or absorbing shock · CPC title

• F16F7/04

  in the direction of the axis of rotation {(F16F7/023 takes precedence)} · CPC title

• F16D7/024

  with axially applied torque limiting friction surfaces · CPC title

• F16F15/129 Primary

  characterised by friction-damping means ({F16F15/1202, F16F15/1238} , F16F15/131 take precedence) · CPC title

• F16C3/02

  Shafts; Axles · CPC title