U.S. patent application number 13/094308 was filed with the patent office on 2012-11-01 for motor-mounted balance ring for a washing machine appliance.
This patent application is currently assigned to GENERAL ELECTRIC COMPANY. Invention is credited to Christopher Nils Naber, Richard Allen Vincent.
Application Number | 20120272690 13/094308 |
Document ID | / |
Family ID | 47066838 |
Filed Date | 2012-11-01 |
United States Patent
Application |
20120272690 |
Kind Code |
A1 |
Vincent; Richard Allen ; et
al. |
November 1, 2012 |
MOTOR-MOUNTED BALANCE RING FOR A WASHING MACHINE APPLIANCE
Abstract
A balance ring for a washing machine appliance that is mounted
onto the motor of the washing machine is provided. Because the
balance ring is placed onto the motor of the washing machine rather
than the wash chamber, additional space is made available for the
wash chamber that can improve the load capacity of the washing
machine. The balance ring can provide improved balance performance
because of its additional moment length from the center of gravity
relative to conventional balance rings.
Inventors: |
Vincent; Richard Allen;
(Louisville, KY) ; Naber; Christopher Nils;
(Louisville, KY) |
Assignee: |
GENERAL ELECTRIC COMPANY
Schenectady
NY
|
Family ID: |
47066838 |
Appl. No.: |
13/094308 |
Filed: |
April 26, 2011 |
Current U.S.
Class: |
68/140 |
Current CPC
Class: |
D06F 37/20 20130101;
D06F 37/24 20130101 |
Class at
Publication: |
68/140 |
International
Class: |
D06F 23/00 20060101
D06F023/00 |
Claims
1. A washing machine, comprising: a wash tub; a wash basket
rotatably mounted in said wash tub, said wash basket having a wash
basket opening for receiving wash fluid and a wash load therein; a
motor in mechanical communication with said wash basket and
configured for causing said wash basket to rotate, said motor
having an axis of rotation, said motor further comprising an
external surface that is offset from the axis of rotation, the
external surface rotating about the axis of rotation when said
motor is activated; and, a balance ring mounted onto the external
surface of the motor, the balance ring configured to offset
imbalances created by articles in the wash tub when said wash
basket is rotated by said motor.
2. A washing machine as in claim 1, wherein said balance ring
comprises a toroidal shape that defines at least one cavity.
3. A washing machine as in claim 2, wherein the cavity of said
balance ring comprises a liquid.
4. A washing machine as in claim 2, wherein the cavity of said
balance ring comprises a plurality of metal balls.
5. A washing machine as in claim 2, wherein said motor comprises a
pancake motor.
6. A washing machine as in claim 2, wherein the external surface of
said motor is parallel to the axis of rotation of said motor.
7. A washing machine as in claim 2, wherein the washing machine is
a vertical axis washing machine.
8. A washing machine as in claim 2, wherein the washing machine is
a horizontal axis washing machine.
9. A washing machine, comprising: a wash tub; a wash basket
rotatably mounted in said wash tub, said wash basket configured for
receiving wash fluid and a wash load therein; a motor having an
axis of rotation, said motor having a rotor that is configured for
rotating said wash basket about the axis of rotation; and, a
toroidal ring mounted onto the rotor of said motor at a position
offset from the axis of rotation of said motor, said ring defining
a cavity into which a mass has been placed, the mass configured to
move within the ring to offset imbalances caused by articles in
said wash basket when rotated by said motor.
10. A washing machine as in claim 9, wherein said rotor defines an
outermost, circumferential surface; and wherein said ring is
mounted upon the outermost, circumferential surface of said
rotor.
11. A washing machine as in claim 10, wherein the outermost,
circumferential surface of said rotor is parallel to the axis of
rotation of said motor.
12. A washing machine as in claim 9, wherein the mass in said
toroidal ring comprises a liquid.
13. A washing machine as in claim 9, wherein the mass in said
toroidal ring comprises a metal.
14. A washing machine as in claim 9, wherein said motor comprises a
pancake motor.
15. A washing machine as in claim 9, wherein the washing machine is
a vertical axis washing machine.
16. A washing machine as in claim 9, wherein the washing machine is
a horizontal axis washing machine.
17. A washing machine as in claim 9, wherein said toroidal ring is
press fit onto said rotor.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a balance ring for a
washing machine appliance that is mounted onto the motor of the
washing machine.
BACKGROUND OF THE INVENTION
[0002] During the operation of a washing machine, particularly
during spin cycles, the machine can sometimes experience an extreme
vibration. These vibrations can even cause displacement of the
washing machine as it "walks" across a surface such as a floor.
Typically, this event is due to the different shapes and densities
of the clothing or objects that are being washed which, after the
washing cycle and draining the washing basket, can stick together
and cause differences in the center of mass inside the wash basket.
The vibration problem can be caused by the introduction of
relatively heavier objects into the washing basket such as e.g.,
shoes.
[0003] By way of example, after the washing cycle and draining of
the washing liquid from the basket, the shoes may be located on one
side of the washing basket or in a manner that causes the center of
mass of the combined washing basket and articles (such as the
shoes, clothes, and other items being washed) to be off center. As
the washing basket is rotated, particularly at high speeds, the off
centering and centrifugal forces creates an imbalance that can
generate undesired strain in the washing machine components, an
undesirable level of noise, and/or "walking" of the appliance. In
an extreme or prolonged situation, the imbalance created by the
excessive vibration can also wear-out and damage the washing
machine components.
[0004] As a result, in order to prevent this imbalance, various
devices have been proposed. For example, washing machines have been
equipped with balance rings, which are typically hollow rings
placed on the top part of the washing basket. Inside the ring (or
toroid) a weight such a liquid or solid balls have been inserted.
During operation, the ring will act as a counterweight to the load
of clothes because liquid or solid balls that move to position
within the ring that counters the centrifugal forces created by the
articles in the wash so as to balance the basket. Balance rings of
various configurations including chambers, partitions, and other
elements to improve the balancing effect have also been
proposed.
[0005] The above mentioned balance rings are typically attached or
connected in some manner with the washing chamber. For example, for
a vertical axis washing machine, the balance ring can be attached
to the bottom of the washing chamber while for a horizontal axis
washing machine, it can be attached to the front, back, or both
ends of the washing chamber. Unfortunately, these arrangements
subtract from the total capacity that can be provided for the
washing chamber resulting in smaller loads of articles that can be
washed. As load capacity can be an important factor in a consumer's
purchasing decision, reductions in that capacity are usually
undesirable.
[0006] Accordingly, a device for balancing the load of a washing
machine would be beneficial. A device that can help balance the
load of a washing machine without reducing the load capacity of the
washing machine would be particularly useful. Such a device that
can be adapted within the conventional used cabinet sizes for a
washing machine would also be particularly useful.
BRIEF DESCRIPTION OF THE INVENTION
[0007] Aspects and advantages of the invention will be set forth in
part in the following description, or may be obvious from the
description, or may be learned through practice of the
invention.
[0008] In one exemplary embodiment, the present invention provides
a washing machine that includes a wash tub and a wash basket. The
wash basket is rotatably mounted in the wash tub. The wash basket
has a wash basket opening for receiving wash fluid and a wash load
therein. A motor is in mechanical communication with the wash
basket and is configured for causing the wash basket to rotate. The
motor has an axis of rotation and includes an external surface that
is offset from the axis of rotation. The external surface rotates
about the axis of rotation when the motor is activated. A balance
ring is mounted onto the external surface of the motor. The balance
ring is configured to offset imbalances created by articles in the
wash tub when the wash basket is rotated by the motor.
[0009] In another exemplary embodiment, the present invention
provides a washing machine that includes a wash tub and a wash
basket rotatably mounted in the wash tub. The wash basket has an
opening configured for receiving wash fluid and a wash load
therein. A motor is provided that has an axis of rotation and a
rotor that is configured for rotating the wash basket about the
axis of rotation. A toroidal ring is mounted onto the rotor of the
motor at a position offset from the axis of rotation of the motor.
The ring defines a cavity into which a mass has been placed. The
mass is configured to move within the ring to offset imbalances
caused by articles in the wash basket when rotated by the
motor.
[0010] These and other features, aspects and advantages of the
present invention will become better understood with reference to
the following description and appended claims. The accompanying
drawings, which are incorporated in and constitute a part of this
specification, illustrate embodiments of the invention and,
together with the description, serve to explain the principles of
the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] A full and enabling disclosure of the present invention,
including the best mode thereof, directed to one of ordinary skill
in the art, is set forth in the specification, which makes
reference to the appended figures, in which:
[0012] FIG. 1 provides a perspective view of an exemplary
embodiment of a washing machine of the present invention. A portion
of the cabinet has been removed to reveal certain elements of the
interior.
[0013] FIG. 2 is a partial schematic view of the interior of the
exemplary embodiment of FIG. 1.
[0014] FIG. 3 is a perspective view of an exemplary embodiment of a
motor as may be used with the present invention.
[0015] FIG. 4 is a cross-sectional view of the exemplary embodiment
of FIG. 3.
DETAILED DESCRIPTION OF THE INVENTION
[0016] The present invention relates to a balance ring for a
washing machine appliance that is mounted onto the motor of the
washing machine. Because the balance ring is placed onto the motor
of the washing machine rather than the wash chamber, additional
space is made available for the wash chamber that can improve the
load capacity of the washing machine. The balance ring can provide
improved balance performance because of its additional moment
length from the center of gravity relative to conventional balance
rings.
[0017] Reference now will be made in detail to embodiments of the
invention, one or more examples of which are illustrated in the
drawings. Each example is provided by way of explanation of the
invention, not limitation of the invention. In fact, it will be
apparent to those skilled in the art that various modifications and
variations can be made in the present invention without departing
from the scope or spirit of the invention. For instance, features
illustrated or described as part of one embodiment can be used with
another embodiment to yield a still further embodiment. Thus, it is
intended that the present invention covers such modifications and
variations as come within the scope of the appended claims and
their equivalents.
[0018] FIG. 1 is a perspective view partially broken away of an
exemplary vertical axis washing machine 50 including a cabinet 52
and a cover 54. A backsplash 56 extends from cover 54, and a
control panel 58 including a plurality of input selectors 60 is
coupled to backsplash 56. Control panel 58 and input selectors 60
collectively form a user interface input for operator selection of
machine cycles and features, and in one embodiment, a display 61
indicates selected features, a countdown timer, and/or other items
of interest to machine users. A lid 62 is mounted to cover 54 and
is rotatable about a hinge (not shown) between an open position
(not shown) facilitating access to wash tub 64 located within
cabinet 52, and a closed position (shown in FIG. 1) forming an
enclosure over wash tub 64.
[0019] Wash tub 64 includes a bottom wall 66 and a sidewall 68, and
a basket 70 that is rotatably mounted within wash tub 64. A pump
assembly 72 is located beneath tub 64 and basket 70 for gravity
assisted flow when draining tub 64. Pump assembly 72 includes a
pump 74 and a motor 76. A pump inlet hose 80 extends from a wash
tub outlet 82 in tub bottom wall 66 to a pump inlet 84, and a pump
outlet hose 86 extends from a pump outlet 88 to a water outlet 90
and ultimately to a building plumbing system discharge line (not
shown) in fluid communication with outlet 90.
[0020] FIG. 2 is a front elevational and schematic view of washing
machine 50 including wash basket 70 movably disposed and rotatably
mounted in wash tub 64 in a spaced apart relationship from tub
sidewall 68 and the tub bottom 66. Basket 70 includes an opening
for receiving wash fluid and a washload therein. Basket 70 includes
a plurality of perforations 71 therein to facilitate fluid
communication between an interior of basket 70 and wash tub 64.
[0021] An agitation element 92, such as a vane agitator, impeller,
auger, or oscillatory basket mechanism, or some combination thereof
is disposed in basket 70 to impart an oscillatory motion to
articles and liquid in basket 70. In different embodiments,
agitation element 92 includes a single action element (i.e.,
oscillatory only), double action (oscillatory movement at one end,
single direction rotation at the other end) or triple action
(oscillatory movement plus single direction rotation at one end,
singe direction rotation at the other end). As illustrated in FIG.
2, agitation element 92 is oriented to rotate about a vertical axis
A. Basket 70 and agitator 92 are driven by pancake motor 94. As
motor output shaft 98 is rotated, basket 70 and agitation element
92 are operated for rotatable movement within wash tub 64.
[0022] Washing machine 50 may also include a brake assembly (not
shown) selectively applied or released for respectively maintaining
basket 70 in a stationary position within tub 64 or for allowing
basket 70 to spin within tub 64. Pump assembly 72 is selectively
activated, in the example embodiment, to remove liquid from basket
70 and tub 64 through drain outlet 90 during appropriate points in
washing cycles as machine 50 is used.
[0023] Operation of machine 50 is controlled by a controller or
processing device (not shown), that is operatively coupled to the
user interface input located on washing machine backsplash 56
(shown in FIG. 1) for user manipulation to select washing machine
cycles and features. In response to user manipulation of the user
interface input, the controller operates the various components of
machine 50 to execute selected machine cycles and features.
[0024] In an illustrative embodiment, laundry items are loaded into
basket 70, and washing operation is initiated through operator
manipulation of control input selectors 60 (shown in FIG. 1). Wash
tub 64 is filled with water and mixed with detergent to form a wash
fluid, and contents of the basket 70 are agitated with agitation
element 92 for cleansing of laundry items in basket 70. More
specifically, agitation element 92 is moved back and forth in an
oscillatory back and forth motion. In the illustrated embodiment,
agitation element 92 is rotated clockwise a specified amount about
the vertical axis of the machine, and then rotated counterclockwise
by a specified amount. The clockwise/counterclockwise reciprocating
motion is sometimes referred to as a stroke, and the agitation
phase of the wash cycle constitutes a number of strokes in
sequence. Acceleration and deceleration of agitation element 92
during the strokes imparts mechanical energy to articles in basket
70 for cleansing action. The strokes may be obtained in different
embodiments with a reversing motor, a reversible clutch, or other
known reciprocating mechanism.
[0025] After the agitation phase of the wash cycle is completed,
tub 64 is drained with pump assembly 72. Laundry items are then
rinsed and portions of the cycle repeated, including the agitation
phase, depending on the particulars of the wash cycle selected by a
user. One or more spin cycles may also be used. In particular, a
spin cycle may be applied after the wash cycle and/or after the
rinse cycle in order to wring wash fluid from the articles being
washed. During a spin cycle, basket 70 is rotated at relatively
high speeds. As previously described, the articles inside basket 70
can sometimes cause an imbalance leading to undesirable vibrations
of machine 50 during operation.
[0026] Accordingly, washing machine 50 is equipped with a balance
ring 106 that operates to counteract imbalances in the wash load
placed into wash tub 64. However, unlike conventional placements,
balance ring 106 is placed onto motor 94 instead of wash basket 70.
As such, balance ring 106 does not subtract from the space
available for wash basket 70, which allows the size of basket 70 to
be maximized for increased wash load capacity.
[0027] More particularly, as shown in the perspective view of FIG.
3, motor 94 includes a rotor 104 that is driven or rotated when
motor 94 is activated. Rotor 104 includes a plurality of vents 102
that allow for the flow of air to help cool motor 94 during
operation. Magnets 95 (FIG. 4) placed inside rotor 104 are used
with forces created by electrical currents to cause rotor 104 to
rotate about axis A in a manner well known in the art. An opening
100 in the center of rotor 104 is provided for the receipt of shaft
98, which is used to place motor 104 in mechanical communication
with wash basket 70. Accordingly, the rotations of rotor 104 about
axis of rotation A can be used to rotate wash basket 70 and
agitation element 92.
[0028] Rotor 104 defines an external surface 109. For this
exemplary embodiment, external surface 109 is the outermost,
circumferential surface of rotor 104. Additionally, for this
exemplary embodiment, surface 109 is parallel to the axis of
rotation A of motor 94 and is offset from axis A. The offset
provides length for a moment created by balance ring 106 in order
to counter weight imbalances in basket 70 during e.g., spin cycles
or other operations that create centrifugal forces in basket
70.
[0029] Balance ring 106 is mounted upon external surface 109.
Preferably, balance ring 106 is positioned using a press fit
assembly. For example, balance ring 106 may be constructed as a
plastic that is snapped or pressed onto external surface 109 with a
tolerance fit. Pegs, detents, or other features may also be used to
secure the position of balance ring 106. Balance ring 106 may also
be adhered or fastened to surface 109. However, other constructions
may be used as well. As shown most clearly in FIG. 2, because
balance ring 106 is positioned on the outermost, circumferential
surface 109 of motor 94, additional space is provided for the
increased capacity of wash basket 70.
[0030] Referring now to FIGS. 3 and 4, balance ring 106 has a
toroidal shape that defines a cavity 108 into which a movable mass
110 has been placed. For the exemplary embodiment shown, mass 110
is a liquid such as e.g., salt water. However, other materials may
be used for mass 110 including movable solids such as metal balls.
Combinations of liquids and movable solids may be used as well. In
addition, ring 106 may be provided with a number of partitions (not
shown) within cavity 108 to slow the movement of liquid about ring
106. As will be understood by one of ordinary skill in the art
using the teachings disclosed herein, a variety of constructions
may be used for balance ring 106 that allow it to offset imbalances
created by articles in wash basket 70 as it is rotated by motor
94.
[0031] Although the above exemplary embodiment was described using
a vertical axis washing machine 50, the present invention may also
be used with a horizontal axis washing machine as well.
Additionally, the present invention is not limited to the
particular shapes for motor 94 and balance ring 106 as shown--it
being understood that other shapes and configurations may be
applied with the teachings set forth in the present disclosure.
[0032] Accordingly, the present invention provides for improvement
in the wash load capacity of a washing machine by placing the
balance ring on a motor powering a wash basket rather than on the
wash basket itself. In addition, relative to conventionally-placed
balance rings, improved balance performance is expected due to the
additional moment length from the center of gravity that is created
by positioning balance ring about the motor.
[0033] This written description uses examples to disclose the
invention, including the best mode, and also to enable any person
skilled in the art to practice the invention, including making and
using any devices or systems and performing any incorporated
methods. The patentable scope of the invention is defined by the
claims, and may include other examples that occur to those skilled
in the art. Such other examples are intended to be within the scope
of the claims if they include structural elements that do not
differ from the literal language of the claims, or if they include
equivalent structural elements with insubstantial differences from
the literal languages of the claims.
* * * * *