U.S. patent application number 16/953723 was filed with the patent office on 2022-05-26 for friction tubes.
This patent application is currently assigned to Hamilton Sundstrand Corporation. The applicant listed for this patent is Hamilton Sundstrand Corporation. Invention is credited to David S. Behling, Aaron Cooling, Glenn C. Lemmers, JR..
Application Number | 20220163091 16/953723 |
Document ID | / |
Family ID | |
Filed Date | 2022-05-26 |
United States Patent
Application |
20220163091 |
Kind Code |
A1 |
Cooling; Aaron ; et
al. |
May 26, 2022 |
FRICTION TUBES
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.
Inventors: |
Cooling; Aaron; (Rockford,
IL) ; Lemmers, JR.; Glenn C.; (Loves Park, IL)
; Behling; David S.; (Belvidere, IL) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Hamilton Sundstrand Corporation |
Charlotte |
NC |
US |
|
|
Assignee: |
Hamilton Sundstrand
Corporation
Charlotte
NC
|
Appl. No.: |
16/953723 |
Filed: |
November 20, 2020 |
International
Class: |
F16F 15/129 20060101
F16F015/129 |
Claims
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. (canceled)
11. 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.
12. The torsion shaft assembly as recited in claim 11, 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.
13. 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.
14. The torsion shaft assembly as recited in claim 13, 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.
15. The torsion shaft assembly as recited in claim 13, 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.
Description
BACKGROUND
1. Field
[0001] The present disclosure relates to torque bearing shafts, and
more particularly to dampening for torque bearing shafts.
2. Description of Related Art
[0002] Torsion shafts can undergo vibration which can limit the
useable life of the torsion shafts. Among the vibrations are those
that act in the angular or circumferential direction.
Traditionally, a torsion shaft must be designed to have enough mass
to handle the angular vibrations for the entire useable life of the
torsion shaft.
[0003] The conventional techniques have been considered
satisfactory for their intended purpose. However, there is an ever
present need for improved systems and methods for handling
vibrations in torsion shafts. This disclosure provides a solution
for this need.
SUMMARY
[0004] 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.
[0005] A helical spring can be engaged with the friction tube on a
driven end of the friction tube to bias the friction tube toward
the damping interface. The friction tube can be engaged with drive
flats of the toque carrying shaft. The drive flats of the torque
carrying shaft can be more proximate the driven end of the torque
carrying shaft than to the driving end. The torque carrying shaft
and the friction tube can be 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. The drive flats of the
torque carrying shaft can be defined as facets in a radially
extending flange of the torque carrying shaft.
[0006] The axial facing damping interface surface of the torque
carrying shaft can be defined on a radially extending flange of the
torque carrying shaft. The radially extending flange can be more
proximate the driving end than the driven end. The torque carrying
shaft and the friction tube can be 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.
[0007] The torque carrying shaft can be hollow defining a fluid
passage therethrough. The torque carrying shaft can include 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. The friction tube can include 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.
[0008] These and other features of the systems and methods of the
subject disclosure will become more readily apparent to those
skilled in the art from the following detailed description of the
preferred embodiments taken in conjunction with the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] So that those skilled in the art to which the subject
disclosure appertains will readily understand how to make and use
the devices and methods of the subject disclosure without undue
experimentation, preferred embodiments thereof will be described in
detail herein below with reference to certain figures, wherein:
[0010] FIG. 1 is a cross-sectional side-elevation view of an
embodiment of a torsion shaft assembly constructed in accordance
with the present disclosure, showing the torque carrying shaft and
the friction tube;
[0011] FIG. 2 is a cross-sectional side-elevation view of a portion
of the torsion shaft assembly of FIG. 1, showing the drive flats;
and
[0012] FIG. 3 is a cross-sectional side-elevation view of a portion
of the torsion shaft assembly of FIG. 1, showing the friction
interface.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0013] Reference will now be made to the drawings wherein like
reference numerals identify similar structural features or aspects
of the subject disclosure. For purposes of explanation and
illustration, and not limitation, a partial view of an embodiment
of a torsion shaft assembly in accordance with the disclosure is
shown in FIG. 1 and is designated generally by reference character
100. Other embodiments of systems in accordance with the
disclosure, or aspects thereof, are provided in FIGS. 2-3, as will
be described. The systems and methods described herein can be used
to dampen angular vibration in torque shafts.
[0014] A torsion shaft assembly 100 includes a torque carrying
shaft 102 including a driving end 106 configured for receiving
torque input to the torque carrying shaft 102 and a driven end 104
configured for outputting torque output from the toque carrying
shaft 102. The torque carrying shaft 102 includes an axial facing
damping interface surface 108 (labeled in FIG. 3) axially between
the driven end 104 and the driving end 106. A friction tube 110 is
disposed outboard of the torque carrying shaft 102. The friction
tube 110 is connected at a first axial location 112 to be driven by
the torque carrying shaft 102. The friction tube 110 includes an
axial facing damping interface surface 114 that abuts the axial
facing damping interface surface 108 of the torque carrying shaft
102, forming a damping interface 116 to provide frictional
dampening against angular vibrations occurring as differential
angular displacement about rotational axis A between the driven end
104 and the driving end 106 of the torque carrying shaft 102.
[0015] A helical spring 118 can be engaged with the friction tube
110 on the driven end 104 of the friction tube 110 to bias the
friction tube 110 toward the damping interface 116 of FIG. 3, i.e.
pushing the friction tube 110 to the right along the rotational
axis A as oriented in FIG. 2. As shown in FIG. 2, the friction tube
110 is engaged with drive flats 120 of the toque carrying shaft
102. The drive flats 120 of the torque carrying shaft 102 are more
proximate the driven end 104 of the torque carrying shaft 102 than
to the driving end 106. As shown in FIG. 1, the torque carrying
shaft 102 and the friction tube 110 are at least ten times longer
(in the axial direction of the rotational axis A) than a distance
D1 from the driven end 104 of the torque carrying shaft 102 to the
drive flats 120. The drive flats 120 of the torque carrying shaft
102 are defined as facets in a radially extending flange 122 of the
torque carrying shaft 102.
[0016] With reference now to FIG. 3, the axial facing damping
interface surface 108 of the torque carrying shaft 102 is defined
on a radially extending flange 124 of the torque carrying shaft
102. The radially extending flange 124 is more proximate the
driving end 106 than the driven end 104 (each end 106, 104 is shown
in FIG. 1). As shown in FIG. 1, the torque carrying shaft 102 and
the friction tube 110 are at least ten times longer than a distance
D2 from the driving end 106 of the torque carrying shaft 102 to the
radially extending flange 124 taken in the axial direction.
[0017] With reference again to FIG. 1, the torque carrying shaft
102 is hollow defining a fluid passage 126 therethrough. The torque
carrying shaft 102 includes one or more bores 128 defined radially
therethrough from the fluid passage 126 to an annular space 130
between the torque carrying shaft 102 and the friction tube 110 for
passage of fluids between the fluid passage 126 and the annular
space 130. The friction tube 110 includes one or more bores 132
defined radially therethrough from the annular space 130 to an
exterior 134 of the friction tube 110 for passage of fluids between
the annular space 130 and the exterior 134.
[0018] Systems and methods as disclosed herein can allow for
dampening angular vibrations in torsion shafts. Torsion shafts with
vibration dampening as disclosed herein can be reduced in mass and
still manage the same loads and useful life time as more massive
traditional torsion shafts without such dampening.
[0019] The methods and systems of the present disclosure, as
described above and shown in the drawings, provide for angular
vibration damping in torque carrying shafts. While the apparatus
and methods of the subject disclosure have been shown and described
with reference to preferred embodiments, those skilled in the art
will readily appreciate that changes and/or modifications may be
made thereto without departing from the scope of the subject
disclosure.
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