U.S. patent application number 15/551287 was filed with the patent office on 2018-02-01 for variable-capacity swashplate-type compressor.
This patent application is currently assigned to DOOWON TECHNICAL COLLEGE. The applicant listed for this patent is DOOWON ELECTRONICS CO., LTD, DOOWON TECHNICAL COLLEGE. Invention is credited to In Pyo BAE, Hyeon Jae KIM, Bong Sub LEE, Geon Ho LEE, Jun Han LEE, Tae Jin LEE.
Application Number | 20180030971 15/551287 |
Document ID | / |
Family ID | 56884792 |
Filed Date | 2018-02-01 |
United States Patent
Application |
20180030971 |
Kind Code |
A1 |
LEE; Geon Ho ; et
al. |
February 1, 2018 |
VARIABLE-CAPACITY SWASHPLATE-TYPE COMPRESSOR
Abstract
A variable-capacity swash plate-type compressor including: a lug
plate coupled to a swash plate so as to be fixed to a driving
shaft; and the swash plate coupled to the lug plate and having a
varying inclination angle while making a rotational motion. The
swash plate includes a body, and first and second arms that
protrude from the body toward the lug plate and are spaced apart
from each other. The lug plate includes a plate, a center lug arm
that protrudes from the plate to be inserted between the first and
second arms and is coupled to the body of the swash plate, and left
and right lug arms that protrude from the plate to be spaced apart
from each other and support both sides of each of the first and
second arms.
Inventors: |
LEE; Geon Ho; (Seongnam,
Gyeonggi-do, KR) ; LEE; Tae Jin; (Anseong-si,
Gyeonggi-do, KR) ; BAE; In Pyo; (Goyang-si,
Gyeonggi-do, KR) ; KIM; Hyeon Jae; (Anseong-si,
Gyeonggi-do, KR) ; LEE; Bong Sub; (Anseong-si,
Gyeonggi-do, KR) ; LEE; Jun Han; (Pyeongtaek-si,
Gyeonggi-do, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
DOOWON TECHNICAL COLLEGE
DOOWON ELECTRONICS CO., LTD |
Anseong-si, Gyeonggi-do
Asan-si, Chungcheongnam-do |
|
KR
KR |
|
|
Assignee: |
DOOWON TECHNICAL COLLEGE
Anseong-si, Gyeonggi-do
KR
DOOWON ELECTRONICS CO., LTD
Asan-si, Chungcheongnam-do
KR
|
Family ID: |
56884792 |
Appl. No.: |
15/551287 |
Filed: |
February 16, 2016 |
PCT Filed: |
February 16, 2016 |
PCT NO: |
PCT/KR2016/001560 |
371 Date: |
August 16, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F04B 27/1036 20130101;
F04B 27/18 20130101; F04B 27/1072 20130101; F04B 27/1063
20130101 |
International
Class: |
F04B 27/18 20060101
F04B027/18; F04B 27/10 20060101 F04B027/10 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 16, 2015 |
KR |
10-2015-0023439 |
Feb 16, 2016 |
KR |
10-2016-0017833 |
Claims
1. A variable-capacity swash plate-type compressor comprising: a
lug plate coupled to a swash plate so as to be fixed to a driving
shaft; and the swash plate coupled to the lug plate and having a
varying inclination angle while making a rotational motion, wherein
the swash plate comprises a body, and first and second arms that
protrude from the body toward the lug plate and are spaced apart
from each other, and the lug plate comprises a plate, a center lug
arm that protrudes from the plate to be inserted between the first
and second arms and is coupled to the body of the swash plate, and
left and right lug arms that protrude from the plate to be spaced
apart from each other and support both sides of each of the first
and second arms.
2. The variable-capacity swash plate-type compressor of claim 1,
wherein at least one part of spaces C.sub.2 and C.sub.3 between the
first and second arms of the swash plate and one side of the center
lug arm and spaces C.sub.1 and C.sub.4 between the first and second
arms and the left and right lug arms are spaced apart from each
other so that a clearance is formed.
3. The variable-capacity swash plate-type compressor of claim 2,
wherein, when the driving shaft rotates, at least one of the left
lug arm, the right lug arm, the center lug arm, and the first and
second arms is twisted so that at least a part of two facing
surfaces in a state in which the clearance is disposed between the
two facing faces, is in contact with each other.
4. The variable-capacity swash plate-type compressor of claim 2,
wherein each of the first and second arms and the left and right
lug arms are spaced apart from each other, thereby forming left and
right clearances, and both sides of each of the first and second
arms and the center lug arm are spaced apart from each other,
thereby forming a center clearance.
5. The variable-capacity swash plate-type compressor of claim 2,
wherein surfaces placed in one among spaces between the first and
second arms and the left and right lug arms and spaces between the
left and right lug arms and the center lug arm are in contact with
each other, thereby forming a torque transfer surface that
transfers power for rotating the swash plate.
6. The variable-capacity swash plate-type compressor of claim 5,
wherein, when a torque transfer surface is formed in a position of
a space C.sub.3 between the second arm and one side of the center
lug arm, the center clearance C.sub.2 has a greater gap than that
of the left clearance C.sub.1 (C.sub.1<C.sub.2).
7. The variable-capacity swash plate-type compressor of claim 5,
wherein, when a torque transfer surface is formed in a position of
a space C.sub.1 between the first arm and the left lug arm, the
one-side center clearance C.sub.3 has a greater gap than that of
the other-side center clearance C.sub.2 (C.sub.2<C.sub.3).
8. The variable-capacity swash plate-type compressor of claim 1,
wherein a through hole through which the center lug arm of the lug
plate passes, is formed in the swash plate, and surface contact
portions are formed on both sides of the through hole and face both
sides of the center lug arm.
Description
TECHNICAL FIELD
[0001] The present invention relates to a variable-capacity swash
plate-type compressor having an improved connection structure of a
lug plate and a swash plate.
BACKGROUND ART
[0002] In general, an air conditioning device used in an automobile
is a device that keeps the temperature of an automobile indoor
lower than the temperature of an outside using a refrigerant, and
includes a compressor, a condenser, and an evaporator so as to
configure a circulation cycle of the refrigerant.
[0003] Such a compressor is a device that compresses and transports
the refrigerant and is driven by power of an engine or a motor.
[0004] A swash plate-type compressor can be classified into a
variable-capacity swash plate-type compressor in which a
disc-shaped swash plate has a varying inclination angle according
to rotation of a driving shaft to which power of the engine is
supplied, and a fixed swash plate-type compressor in which the
disc-shaped swash plate is fixedly installed on the driving shaft
to which power of the engine is supplied.
[0005] In the variable-capacity swash plate-type compressor, the
inclination angle of the swash plate varies consecutively according
to a variation of thermal load, and the transportation amount of a
piston is controlled so that a flow can be precisely controlled,
and a change in rapid torque of the engine caused by the compressor
is prevented so that riding comfort of the automobile can be
improved.
[0006] Regarding a connection structure of a lug plate and the
swash plate of a variable-capacity swash plate-type compressor
according to the related art, protrusions that protrude toward the
swash plate are formed on the lug plate, and arms having a moving
roller that rolls and moves in contact with the protrusions, are
formed in the swash plate. The lug plate and the swash plate are
connected to each other due to surface contact between the
protrusions and the arms.
[0007] In this case, inclination movement in which the inclination
angle of the swash plate varies with respect to the lug plate, and
transfer of a rotational force for transferring a rotational force
of the lug plate to the arms of the swash plate are performed
simultaneously on both sides of one side and the other side of the
protrusions. Thus, inclination movement and rotation are not
smoothly performed, and load is concentrated on the protrusions of
the lug plate so that durability is lowered and damage easily
occurs due to cracks caused by lowered durability.
[0008] Meanwhile, the prior art that is the background of the
present invention is disclosed in Korean Patent Registration No.
10-1193399.
DETAILED DESCRIPTION OF THE INVENTION
Technical Problem
[0009] The present invention provides a variable-capacity swash
plate-type compressor having an improved connection structure of a
lug plate and a swash plate so as to disperse rotational torque,
compressive load, and torsional moment, which are applied to the
swash plate and the lug plate.
Technical Solution
[0010] According to an aspect of the present invention, there is
provided a variable-capacity swash plate-type compressor including:
a lug plate coupled to a swash plate so as to be fixed to a driving
shaft; and the swash plate coupled to the lug plate and having a
varying inclination angle while making a rotational motion, wherein
the swash plate may include a body, and first and second arms that
protrude from the body toward the lug plate and are spaced apart
from each other, and the lug plate may include a plate, a center
lug arm that protrudes from the plate to be inserted between the
first and second arms and is coupled to the body of the swash
plate, and left and right lug arms that protrude from the plate to
be spaced apart from each other and support both sides of each of
the first and second arms.
[0011] At least one part of spaces C.sub.2 and C.sub.3 between the
first and second arms of the swash plate and one side of the center
lug arm and spaces C.sub.1 and C.sub.4 between the first and second
arms and the left and right lug arms may be spaced apart from each
other so that a clearance is formed.
[0012] When the driving shaft rotates, at least one of the left lug
arm, the right lug arm, the center lug arm, and the first and
second arms may be twisted so that at least a part of two facing
surfaces in a state in which the clearance is disposed between the
two facing faces, is in contact with each other.
[0013] Each of the first and second arms and the left and right lug
arms may be spaced apart from each other, thereby forming left and
right clearances, and both sides of each of the first and second
arms and the center lug arm may be spaced apart from each other,
thereby forming a center clearance.
[0014] Surfaces placed in one among spaces between the first and
second arms and the left and right lug arms and spaces between the
left and right lug arms and the center lug arm may be in contact
with each other, thereby forming a torque transfer surface that
transfers power for rotating the swash plate.
[0015] When a torque transfer surface is formed in a position of a
space C.sub.3 between the second arm and one side of the center lug
arm, the center clearance C.sub.2 may have a greater gap than that
of the left clearance C.sub.1 (C.sub.1<C.sub.2).
[0016] When a torque transfer surface is formed in a position of a
space C.sub.1 between the first arm and the left lug arm, the
one-side center clearance C.sub.3 may have a greater gap than that
of the other-side center clearance C.sub.2
(C.sub.2<C.sub.3).
[0017] A through hole through which the center lug arm of the lug
plate passes, may be formed in the swash plate, and surface contact
portions may be formed on both sides of the through hole and may
face both sides of the center lug arm.
Effect of the Invention
[0018] In a variable-capacity swash plate-type compressor according
to at least one of exemplary embodiments of the present invention,
a pair of arms of a swash plate, and a center lug arm and left and
right lug arms of a lug plate are arranged by engaging with each
other, so as to disperse torsional moment and support the lug plate
when the lug plate rotates, thereby reducing the load applied to
the respective arms. Therefore, controllability and durability of
the swash plate can be improved.
DESCRIPTION OF THE DRAWINGS
[0019] FIG. 1 is a top plan view of a variable-capacity swash
plate-type compressor according to an embodiment of the present
invention.
[0020] FIGS. 2 and 3 are views of the usage state of movement of
the swash plate in the variable-capacity swash plate-type
compressor illustrated in FIG. 1.
[0021] FIG. 4 is a top plan view of a lug plate of the
variable-capacity swash plate-type compressor illustrated in FIG. 1
and a side view thereof.
[0022] FIG. 5 is a top plan view of the swash plate of the
variable-capacity swash plate-type compressor illustrated in FIG. 1
and a side view thereof.
[0023] FIG. 6 is an exploded perspective view of the lug plate and
the swash plate of the variable-capacity swash plate-type
compressor illustrated in FIG. 1.
[0024] FIG. 7 is a top plan view of a variable-capacity swash
plate-type compressor according to another embodiment of the
present invention.
BEST MODE
[0025] According to the present invention, at least one of spaces
C.sub.2 and C.sub.3 between first and second arms of a swash plate
and sides of a center lug arm of a lug plate and spaces C.sub.1 and
C.sub.4 between the first and second arms and left and right lug
arms of the lug plate are spaced apart from each other so that a
clearance can be formed, and surfaces placed in one of spaces
between the first and second arms and the left and right lug arms
and spaces between the left and right lug arms and the center lug
arm are in contact with each other, thereby forming a torque
transfer surface that transfers power for rotating the swash plate
so that a connection structure of the lug plate and the swash plate
is improved and rotational torque, compressive load and torsional
moment, which are applied to the swash plate and the lug plate, can
be dispersed.
Modes of the Invention
[0026] Hereinafter, exemplary embodiments of the present invention
will be described in detail with reference to the accompanying
drawings. Before describing this, the terms or words used in the
present specification and the claims should not be interpreted to
be limited in a general or dictionary sense but should be
interpreted in a meaning and concept that comply with the technical
concept of the present invention based on a principle that the
inventor can define the concept of the terms properly so as to
describe his/her own invention in a best manner.
[0027] Therefore, embodiments described in the present
specification and configuration shown in the drawings are just
exemplary embodiments of the invention and do not represent the
technical concept of the present invention, and it should be
understood that there may be various modifications that may replace
the embodiments of the present specification and the drawings at
the time of filing the present application.
[0028] FIG. 1 is a top plan view of a variable-capacity swash
plate-type compressor according to an embodiment of the present
invention.
[0029] Referring to the drawing, the variable-capacity swash
plate-type compressor according to the present invention includes a
driving shaft 20, a lug plate 100 coupled to a swash plate 200 so
as to be fixed to the driving shaft 20, and the swash plate 200
coupled to the lug plate 100 and having a varying inclination angle
while making a rotational motion.
[0030] The driving shaft 20 has a straight rod shape and is fixedly
coupled to the lug plate 100. Thus, as the driving shaft 20
rotates, the lug plate 100 is simultaneously rotated so that the
driving shaft 20 transfers power for rotating the lug plate
100.
[0031] The lug plate 100 is coupled to the swash plate 200 to be
fixed to the driving shaft 20 so as to be rotated together when the
driving shaft 20 rotates. The lug plate 100 includes a plate 110, a
center lug arm 120, and left and right lug arms 131 and 132.
[0032] Also, the plate 110 forms a body of the lug plate 100 and
has an approximately circular shape, and the center lug arm 120 and
the left and right lug arms 131 and 132 are formed at one side of
the plate.
[0033] The center lug arm 120 protrudes from the plate 110 to be
inserted between a pair of arms 211 and 212 that protrude from the
swash plate 200 and is coupled to a body 210 of the swash plate
200. The center lug arm 120 passes through the body 210 of the
swash plate 200 and transfers rotational moment for rotating the
swash plate 200.
[0034] The center lug arm 120 is disposed in the center of the left
and right lug arms 131 and 132, and the left and right lug arms 131
and 132 protrude from the plate 110 to be spaced apart from each
other. At least a part of the first and second arms 211 and 212
that form a pair protruding from the swash plate 200 are supported
on both sides of each of the left and right lug arms 131 and
132.
[0035] The swash plate 200 includes the body 210, and the pair of
arms 211 and 212 that protrude from the body 210 toward the lug
plate 100 to be spaced apart from each other.
[0036] The first and second arms 211 and 212 that forms a pair are
in contact with the left and right lug arms 131 and 132 and the
center lug arm 120 so as to disperse rotational moment transferred
to the swash plate 200 while the lug plate 100 rotates. Thus,
problems of lowered durability or cracks due to load concentrated
on one place (in particular, an end of the center lug arm 120) can
be overcome.
[0037] In this case, a clearance 300 may be formed with a
predetermined gap in a space between the first and second arms 211
and 212 that forms a pair, the left and right lug arms 131 and 132,
and both sides that are one side and the other side of the center
lug arm 120.
[0038] The clearance 300 may be formed with the predetermined gap
when at least one part of spaces C.sub.2 and C.sub.3 between the
first and second arms 211 and 212 that forms a pair of the swash
plate 200 and both sides 120a and 120b of the center lug arm 120
and spaces C.sub.1 and C.sub.4 between the first and second arms
211 and 212 of the swash plate 200 and the left and right lug arms
131 and 132 are spaced apart from each other.
[0039] In this case, at least one part of the spaces C.sub.2 and
C.sub.3 between the first and second arms 211 and 212 and both
sides 120a and 120b of the center lug arm 120 and the spaces
C.sub.1 and C.sub.4 between the first and second arms 211 and 212
and the left and right lug arms 131 and 132 may be in contact with
each other, thereby forming a torque transfer surface 400 for
rotational moment.
[0040] Referring to FIG. 1, when the torque transfer surface 400 is
formed in a position of the space C.sub.3 between the second arm
212 and the other side 120b of the center lug arm 120, the spaces
C.sub.1 and C.sub.4 between the first and second arms 211 and 212
and the left and right lug arms 131 and 132 are spaced apart from
each other, thereby forming left and right clearances 310 and 320,
and the space C.sub.2 between the first and second arms 211 and 212
and the one side of the center lug arm 120 are spaced apart from
each other, thereby forming a center clearance 330.
[0041] In this case, the center clearance 330 in the space C.sub.2
between the first and second arms 211 and 212 and the one side of
the center lug arm 120 may have a greater gap than that of the left
clearance 310 in the space C.sub.1 between the first arm 211 and
the left lug arm 131 (C.sub.1<C.sub.2).
[0042] Hereinafter, driving of the respective lug arms 120, 131,
and 132 and a pair of arms 211 and 212 when the driving shaft 20
rotates will be described.
[0043] When the driving shaft 20 rotates, at least one of the left
lug arm 131, the right lug arm 132, the center lug arm 120, and the
pair of arms 211 and 212 is twisted. Subsequently, at least a part
of two facing surfaces in a state in which the clearance 300 is
formed between the two facing surfaces, is in contact with each
other due to torsion. In detail, one of the left lug arm 131 and
the first arm 211 may be twisted and in contact with each other, or
one of the first arm 211 and the center lug arm 120 may be twisted
and in contact with each other. Also, one of the second arm 212 and
the right lug arm 132 may be twisted and in contact with each
other.
[0044] In this case, the left and right clearances 310 and 320 may
have a smaller gap than that of the center clearance 330 so that,
when the driving shaft 20 rotates, the pair of arms 211 and 212 are
twisted, the twisted pair of arms 211 and 212 are firstly in
contact with the left and right lug arms 131 and 132 and then are
in contact with the center lug arm 120. This is because a
rotational force is concentrated on the center lug arm 120 and thus
the left lug arm 131 and the first arm 211 are firstly in contact
with each other and the rotational force and torsional moment can
be dispersed.
[0045] Sides of one of the pair of arms 211 and 212 are in contact
with the center lug arm 120 so that the torque transfer surface 400
that transfers power for rotating the swash plate 200 can be
formed.
[0046] Referring to the drawing, the center lug arm 120 directly
presses the second arm 212 via the torque transfer surface 400 so
that the rotational force for rotating the swash plate 200 can be
transferred in a wide range. In other words, the rotational force
is transferred via the torque transfer surface 400 for rotational
moment as well as a surface that the center lug arm passes through
the body 210 and then directly contacts, so that load can be
prevented from being concentrated.
[0047] FIGS. 2 and 3 are views of the usage state of movement of
the swash plate 200 in the variable-capacity swash plate-type
compressor illustrated in FIG. 1.
[0048] Referring to the drawings, the swash plate 200 is formed to
be rotated relative to the lug plate 100. A pair of arms (see 211
and 212 of FIG. 1) of the swash plate 200 are in contact with an
inclination surface (see 112 of FIG. 3) formed on the lug plate 100
and slide thereon so that the inclination angle of the swash plate
200 may vary. Also, a spring is provide on a rear surface of the
swash plate 200 and presses the swash plate 200 toward the lug
plate 100 so that the swash plate 200 and the lug plate 100 cannot
be separated from each other.
[0049] Meanwhile, a through hole (see 230 of FIG. 5) is formed in
the center of the body 210 of the swash plate 200 so that the
driving shaft (see 20 of FIG. 1) is not caught on the swash plate
200 according to rotation.
[0050] FIG. 4 is a view of the lug plate 100 of the
variable-capacity swash plate-type compressor illustrated in FIG.
1, and FIG. 5 is a view of the swash plate 200 of the
variable-capacity swash plate-type compressor illustrated in FIG.
1.
[0051] First, referring to FIG. 4, (a) of FIG. 4 is a top view of
the lug plate 100, and (b) of FIG. 4 is a side view of the lug
plate 100.
[0052] In this case, the left and right lug arms 131 and 132 and
the center lug arm 120 are formed on the lug plate 100, and the
inclination surface 112 is formed between the left and right lug
arms 131 and 132 and the center lug arm 120, and the inclination
surface 112 may be in contact with fore-ends of the pair of arms
211 and 212 of the swash plate 200, and compressive load may be
applied to the inclination surface 112.
[0053] The center lug arm 120 protrudes from the plate 110 to be
longer than the left and right lug arms 131 and 132. This is
because the fore-ends of the center lug arm 120 pass through the
swash plate 200 and transfer rotational force to the swash plate
200.
[0054] Ends 110a of the inclination surface 112 may be formed to be
compressed and supported in such a way that the pair of arms 211
and 212 of the swash plate 200 do not ascend any longer.
[0055] FIG. 5 is a top plan view of the swash plate of the
variable-capacity swash plate-type compressor illustrated in FIG. 1
and a side view thereof.
[0056] Referring to FIG. 5, (a) of FIG. 5 is a top view of the
swash plate 200, and (b) of FIG. 5 is a side view of the swash
plate 200.
[0057] A through hole 230 through which the center lug arm 120 of
the lug plate 100 passes, is formed in the swash plate 200. Surface
contact portions that face both sides 120a and 120b of the center
lug arm 120 may be formed on both sides 231 and 232 of the through
hole 230. Through the surface contacting portions 234, rotational
force may be transferred from the fore-ends of the center lug arm
120.
[0058] FIG. 6 is an exploded perspective view of the lug plate 100
and the swash plate 200 of the variable-capacity swash plate-type
compressor illustrated in FIG. 1.
[0059] (a) of FIG. 6 illustrates the swash plate 200, and (b) of
FIG. 6 illustrates the lug plate 100.
[0060] Referring to (a) of FIG. 6, a pair of arms 211 and 212
protrude from the body 210 of the swash plate 200 toward one side,
and the through hole 230 through an opening is formed between the
pair of arms 211 and 212.
[0061] As described above, when the swash plate 200 is rotated by
rotation of the lug plate 100, at least one arm of the first arm
211 and the second arm 212 is twisted, is in contact with the
center lug arm or the left and right lug arms, and torsional moment
is applied to the at least one arm of the first arm 211 and the
second arm 212. The torsional moment is transferred in a direction
F.sub.1.
[0062] Meanwhile, the center lug arm 120 is in contact with the
first arm 211 so that rotational force can be transferred to the
first arm 211 via a rotational torque transfer surface (see 400 of
FIG. 1). In this case, rotational force is applied to an inside
surface of the first arm 211, and the rotational force is applied
to the first arm 211 in a direction F.sub.2.
[0063] Because the pair of arms 211 and 212 slide while being in
contact with the inclination surface 112, compressive load with
respect to the inclination surface 112 may be applied to the
fore-ends of the pair of arms 211 and 212 in a direction
F.sub.3.
[0064] Next, referring to (b), the inclination surface 112 is
formed on the lug plate 100 and guides inclination movement while
being in surface contact with the fore-ends of the pair of arms of
the swash plate 200. The inclination surface 112 is formed between
the left and right lug arms 131 and 132 and the center lug arm 120,
respectively, so that the pair of arms are engaged with each other
through the inclination surface 112 and are supported thereon.
[0065] Torsional moment is applied to the right lug arm 132 in a
position of the right lug arm 132 facing the second arm 212 in the
direction F.sub.1. Rotational force applied as a reaction while
applying force for rotating the swash plate 200 using the lug plate
100 is applied to one side of the fore-ends of the center lug arm
120 in the direction F.sub.2.
[0066] As described above, the pair of arms 211 and 212 are
supported on the inclination surface 112, and compressive load is
applied to the direction F.sub.3.
[0067] When describing another embodiment of the present invention
with reference to FIG. 7, when the torque transfer surface 400 is
formed in a position of the space C.sub.1 between the first arm 211
and the left lug arm 131, the center first and second clearances
310 and 320 are formed in the spaces C.sub.2 and C.sub.3 between
both sides of the left and right lug arms 131 and 132 and the
center lug arm 120 to be spaced apart from each other, and the
right clearance 330 may be formed when the space C.sub.4 between
the second arms 211 and 212 and the right lug arm 132 are spaced
apart from each other.
[0068] In this case, the center second clearance 320 may have a
greater gap than that of the center first clearance 310
(C.sub.2<C.sub.3).
[0069] This is because rotational force is concentrated on the left
lug arm 131 and thus the center first and second clearances 310 and
320 are firstly in contact with each other so as to disperse
rotational force and torsional moment.
[0070] While the present invention has been particularly shown and
described with reference to exemplary embodiments thereof, it will
be understood by those of ordinary skill in the art that various
changes in form and details may be made therein without departing
from the spirit and scope of the present invention as defined by
the following claims.
* * * * *