Damped propshaft assembly and tuned damper for a damped propshaft assembly

Patent metadata

Field	Value
Publication number	US-10018244-B2
Application number	US-201514924940-A
Country	US
Kind code	B2
Filing date	Oct 28, 2015
Priority date	Apr 16, 2014
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

A damped propshaft assembly with a hollow shaft and a tuned damper, which is received in the hollow shaft and includes a liner and a damping member. The liner's mass and stiffness are tuned to attenuate one or more of a bending mode vibration and a torsion mode vibration that occurs at a first predetermined frequency. The liner is not configured to substantially damp shell mode vibration that occurs at a frequency that is not equal to the first predetermined frequency. The damping member is coupled to the liner and is configured to primarily attenuate shell mode vibration in the hollow shaft at one or more desired frequencies. The tuned damper attenuates the at least one of the bending moment vibration and the torsion mode vibration at the first predetermined frequency and also attenuates shell mode vibration. A method for forming a damped propshaft assembly is also provided.

First claim

What is claimed is:

1. A damped propshaft assembly comprising:
a hollow shaft; and
a pair of tuned dampers received in the hollow shaft, each of the tuned dampers having a liner and a damping member, each of the liners comprising a tubular structure, which does not contact the hollow shaft, and at least one resilient member that is affixed to the tubular structure and contacts an interior surface of the hollow shaft, each of the liners having a mass and a stiffness that are tuned to attenuate one or more of a bending mode vibration and a torsion mode vibration that occurs at a first predetermined frequency, each of the liners not being configured to substantially damp shell mode vibration that occurs at a frequency that is not equal to the first predetermined frequency, each of the damping members being coupled to an associated one of the liners, each of the damping members being configured to primarily attenuate the shell mode vibration in the hollow shaft at one or more desired frequencies;
wherein the tuned dampers attenuate the at least one of the bending mode vibration and the torsion mode vibration at the first predetermined frequency and also attenuates the shell mode vibration.

2. The damped propshaft assembly of claim 1 , wherein the liners are not configured to substantially damp the shell mode vibration occurring at a frequency that is less than or equal to 1000 Hz.

3. The damped propshaft assembly of claim 1 , wherein the damping members provide broadband damping.

4. The damped propshaft assembly of claim 3 , wherein the broadband damping includes damping of the shell mode vibration and damping of bending mode vibration at a plurality of frequencies.

5. The damped propshaft assembly of claim 3 , wherein each of the damping members is a resistive absorber.

6. The damped propshaft assembly of claim 3 , wherein each of the liners is configured to contact an inside surface of the hollow shaft over a first area, wherein each of the damping members is configured to contact the inside surface of the hollow shaft over a second area, and wherein a ratio of the first area to the second area is less than or equal to five (5) percent.

7. The damped propshaft assembly of claim 6 , wherein the ratio of the first area to the second area is less than or equal to two and one-half (2.5) percent.

8. The damped propshaft assembly of claim 7 , wherein the ratio of the first area to the second area is less than or equal to one and one-quarter (1.25) percent.

9. The damped propshaft assembly of claim 3 , wherein each of the damping members includes at least one contact member that is configured to contact an inside surface of the hollow shaft and wherein each of the damping members has a durometer of between 40 Shore A and 80 Shore A.

10. The damped propshaft assembly of claim 1 , wherein each of the liners is disposed symmetrically about a bending anti-node.

11. The damped propshaft assembly of claim 10 , wherein the bending anti-node is a second bending anti-node.

12. The damped propshaft assembly of claim 1 , wherein each of the tubular structures is formed of cardboard.

13. A tuned damper for damping a propshaft assembly, the propshaft assembly including a hollow shaft with an inside diametrical surface, the tuned damper comprising:
a liner having a tubular structure and at least one resilient member, the tubular structure having a diameter that is smaller than the inside diametrical surface so that the tubular structure does not touch the inside diametrical surface when the tuned damper is received into the hollow shaft, the at least one resilient member being affixed to the tubular structure and configured to contact the inside diametrical surface of the hollow shaft, the liner having a mass and a stiffness that are tuned to attenuate one or more of a bending mode vibration and a torsion mode vibration that occurs at a first predetermined frequency, the liner itself not being configured to substantially damp shell mode vibration that occurs at a frequency that is not equal to the first predetermined frequency,
a damping member coupled to the liner, the damping member being configured to primarily attenuate the shell mode vibration in the hollow shaft at one or more desired frequencies;
wherein the tuned damper is configured to attenuate the at least one of the bending mode vibration and the torsion mode vibration at the first predetermined frequency and is also configured to attenuate the shell mode vibration.

14. The tuned damper of claim 13 , wherein the liner is not configured to substantially damp the shell mode vibration occurring at a frequency that is less than or equal to 1000 Hz.

15. The tuned damper of claim 13 , wherein the damping member provides broadband damping.

16. The tuned damper of claim 15 , wherein the broadband damping includes damping of the shell mode vibration and damping of bending mode vibration at a plurality of frequencies.

17. The tuned damper of claim 15 , wherein the damping member is a resistive absorber.

18. The tuned damper of claim 15 , wherein the liner is configured to contact an inside surface of the hollow shaft over a first area, wherein the damping member is configured to contact the inside surface of the hollow shaft over a second area, and wherein a ratio of the first area to the second area is less than or equal to five (5) percent.

19. The tuned damper of claim 18 , wherein the ratio of the first area to the second area is less than or equal to two and one-half (2.5) percent.

20. The tuned damper of claim 19 , wherein the ratio of the first area to the second area is less than or equal to one and one-quarter (1.25) percent.

21. The tuned damper of claim 13 , wherein the damping member includes at least one contact member that is configured to contact an inside surface of the hollow shaft and wherein the damping member has a durometer of between 40 Shore A and 80 Shore A.

22. The tuned damper of claim 13 , wherein the tubular structure is formed of cardboard.

Assignees

• American Axle & Mfg Inc

Inventors

• Ley Jason
• Sun Zhaohui
• Braun William
• Nyquist Jeffrey P
• Voight Michael A

Classifications

• F16F15/1435 Primary

  Elastomeric springs, i.e. made of plastic or rubber · CPC title

• F16F15/322 Primary

  the rotating body being a shaft (F16F15/34, F16F15/36 take precedence) · CPC title

• B60Y2300/207

  related to drive shaft torsion, e.g. driveline oscillations · CPC title

• F16C3/023

  made of several parts, e.g. by welding · CPC title

• F16H57/0006 Primary

  Vibration-damping or noise reducing means specially adapted for gearings (devices for varying tension of belts, ropes or chains with damping means F16H7/0829; toothed members with construction providing vibration damping F16H55/14; reducing vibrations or noise of the gearbox casing F16H57/028; suppression of vibrations or noise of gear selectors F16H59/0208; control of hydrostatic fluid gearing preventing or reducing vibrations or noise F16H61/4183) · CPC title