U.S. patent application number 13/665168 was filed with the patent office on 2013-05-16 for drum washing machine.
This patent application is currently assigned to SAMSUNG ELECTRONICS CO., LTD.. The applicant listed for this patent is SAMSUNG ELECTRONICS CO., LTD.. Invention is credited to Yun Joo CHANG, Jeoung Kyo Jeoung, Soon Oh Lee, Hoon Wee.
Application Number | 20130118211 13/665168 |
Document ID | / |
Family ID | 47143648 |
Filed Date | 2013-05-16 |
United States Patent
Application |
20130118211 |
Kind Code |
A1 |
CHANG; Yun Joo ; et
al. |
May 16, 2013 |
DRUM WASHING MACHINE
Abstract
A drum washing machine provided with a dynamic absorber capable
of reducing the vibration of a low frequency band, the drum washing
machine including a body, a drum rotatably installed at an inside
the body, a tub installed to vibrate while surrounding the drum,
and a dynamic absorber installed at the tub to directly reduce
vibration delivered to the tub, wherein the dynamic absorber
includes a mass body and an elastic member configured to
elastically support the mass body for the mass body to move toward
a direction of the vibration of the tub to reduce the vibration of
the tub.
Inventors: |
CHANG; Yun Joo; (Seoul,
KR) ; Lee; Soon Oh; (Gunpo-si, KR) ; Jeoung;
Jeoung Kyo; (Hwaseong-si, KR) ; Wee; Hoon;
(Yongin-si, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SAMSUNG ELECTRONICS CO., LTD.; |
Suwon-si |
|
KR |
|
|
Assignee: |
SAMSUNG ELECTRONICS CO.,
LTD.
Suwon-si
KR
|
Family ID: |
47143648 |
Appl. No.: |
13/665168 |
Filed: |
October 31, 2012 |
Current U.S.
Class: |
68/139 |
Current CPC
Class: |
D06F 37/22 20130101;
F16F 7/116 20130101; D06F 37/265 20130101 |
Class at
Publication: |
68/139 |
International
Class: |
D06F 25/00 20060101
D06F025/00 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 11, 2011 |
KR |
10-2011-0117287 |
Claims
1. A drum washing machine, comprising: a body; a drum rotatably
installed at an inside the body; a tub installed to vibrate while
surrounding the drum; and a dynamic absorber installed at the tub
to directly reduce vibration delivered to the tub, wherein the
dynamic absorber comprises: a mass body; and an elastic member
configured to elastically support the mass body to move toward a
direction of the vibration of the tub to reduce the vibration of
the tub.
2. The drum washing machine of claim 1, further comprising: a
fixation bracket installed at the tub and configured to fix the
elastic member, wherein the fixation bracket comprises: a first
fixation bracket installed at one side of a rear side of the tub;
and a second fixation bracket installed while laterally opposing
the first fixation bracket.
3. The drum washing machine of claim 2, wherein the elastic member
comprises: a first elastic member configured to connect between the
first fixation bracket and the mass body; and a second elastic
member configured to connect between the second fixation bracket
and the mass body.
4. The drum washing machine of claim 1, wherein further comprises:
a friction reducing part configured to minimize friction of the
mass body that is moved by the elastic member.
5. The drum washing machine of claim 4, wherein the friction
reducing part comprises: a first slide rail formed at the tub; a
second slide rail installed at a bottom surface of the mass body to
correspond to the first slide rail; and a plurality of balls
provided in between the first slide rail and the second slide
rail.
6. The drum washing machine of claim 2, wherein the mass body
comprises a through-hole formed at a center thereof, and wherein
the drum washing machine further comprises: a shaft configured to
pass through the through-hole of the mass body and connect in
between the first fixation bracket and the second fixation bracket,
and a plurality of spherical members provided in between the shaft
and the through-hole, so that the mass body slidably moves through
the shaft and the plurality of spherical member.
7. The drum washing machine of claim 6, wherein the mass body is
elastically supported at one side and the other side thereof by the
elastic member, wherein the elastic member is installed at an outer
circumferential surface of the shaft, and comprises a first elastic
member connectively installed at the first fixation bracket and a
second elastic member connectively installed at the second fixation
bracket.
8. The drum washing machine of claim 2, wherein at least one of the
first fixation bracket and the second fixation bracket comprises a
hinge apparatus, and one side of the mass body is rotatably fixed
by the hinge apparatus, and the other side of the mass body is
movably installed so as to be moved in a direction toward left and
right sides of the tub by the elastic member.
9. The drum washing machine of claim 1, wherein the dynamic
absorber further comprises: a casing to form an exterior of the
dynamic absorber, fixed to the tub and being provided with the mass
body at an inside thereof; a plurality of elastic members fixed to
the casing and the mass body to support the mass body; and a
friction reducing part configured to reduce friction of the mass
body that is moved by the elastic member, wherein the friction
reducing part comprises oil provided at an inside the casing.
10. A drum washing machine, comprising: a body; a drum rotatably
installed at an inside the body; a tub installed to vibrate while
surrounding the drum; and a dynamic absorber installed at the rub
to directly reduce the vibration delivered to the tub, wherein the
dynamic absorber comprises: a mass body; an elastic member to
elastically support the mass body; a fixation bracket installed at
the tub and configured to fix the elastic member; and a friction
reducing part provided to minimize friction of the mass body that
is moved by the elastic member.
11. The drum washing machine of claim 10, wherein the dynamic
absorber is movably installed at a rear side of the tub so as to be
moved to a left and a right side of the tub to reduce a
left-to-right vibration of the tub.
12. The drum washing machine of claim 10, wherein the fixation
bracket comprises a first fixation bracket installed at a rear side
of the tub and a second fixation bracket installed while opposing
the first fixation bracket.
13. The drum washing machine of claim 12, wherein the elastic
member comprises: a first elastic member configured to connect
between the first fixation bracket and the mass body, and a second
elastic member configured to connect between the second fixation
bracket and the mass body, wherein the mass body is movably
installed to move in a direction toward left and right sides of the
tub by the plurality of elastic members.
14. The drum washing machine of claim 10, wherein the friction
reducing part comprises: a first slide rail formed at the tub; a
second slide rail installed at a bottom surface of the mass body to
correspond to the first slide rail; and a plurality of balls
provided in between the first slide rail and the second slide
rail.
15. The drum washing machine of claim 12, wherein the mass body
further comprises a through-hole formed at a center thereof, and
wherein the drum washing machine further comprises: a shaft
configured to pass through the through-hole of the mass body and
connect in between the first fixation bracket and the second
fixation bracket, and a plurality of spherical members provided in
between the shaft and the through-hole, so that the mass body moves
in a direction toward the left and the right side of the tub
through the shaft and the plurality of spherical members.
16. The drum washing machine of claim 15, wherein the mass body is
elastically supported at one side and the other side thereof by the
elastic member, wherein the elastic member is installed at an outer
circumferential surface of the shaft, and comprises a first elastic
member connectively installed at the first fixation bracket and a
second elastic member connectively installed at the second fixation
bracket.
17. The drum washing machine of claim 10, wherein the fixation
bracket comprises a plurality of elastic members configured to
elastically support the mass body.
18. The drum washing machine of claim 1, wherein the dynamic
absorber further comprises: a casing to form an exterior of the
dynamic absorber, fixed to the tub and being provided with the mass
body having a disc-shape at an inside thereof; and a plurality of
elastic members fixed to the casing and the mass body to support
the mass body.
19. The drum washing machine of claim 18, wherein the casing is
provided with a hollow core formed therein and has an open upper
surface thereof, and wherein the dynamic absorber further comprises
a panel coupled to the open upper surface of the casing to close
the casing.
20. The drum washing machine of claim 19, wherein the panel is
formed with a transparent material.
21. The drum washing machine of claim 1, wherein the mass body is
elastically supported by a plurality of elastic members that are
provided at a bottom surface of the mass body and includes at least
one rubber column having a cylindrical shape.
22. The drum washing machine of claim 1, wherein the dynamic
absorber further comprises a hinge apparatus including at least one
hinge link unit which includes a first hinge link rotatably
connected to the tub and a second hinge link rotatably connected to
the first hinge link and the mass body.
23. The drum washing machine of claim 1, wherein the mass body
includes a hole formed in the center of the mass body, and the
elastic member is installed at the hole, wherein the elastic member
includes a circular part formed in a shape of a ring and a
supporting part connected in between the circular part and the mass
body.
24. The drum washing machine of claim 1, wherein the elastic member
includes at least one of a spring or a rubber.
25. The drum washing machine of claim 1, wherein the mass body is
provided at a central portion of an upper surface thereof with a
supportive protrusion connected to the elastic member and the
elastic member includes at least one rubber band connectively
installed to the supportive protrusion, and wherein the elastic
member is connectively installed at the fixation bracket which is
fixed to the tub, and the fixation bracket is provided at a
predetermined height to allow the mass body to be suspended.
26. The drum washing machine of claim 1, wherein the mass body is
elastically supported by the plurality of elastic members that are
provided at a bottom surface of the mass body, and the mass body
includes at least one elastic member column.
27. A drum washing machine, comprising: a body; a drum rotatably
installed at an inside the body; a tub installed in a way to
vibrate while surrounding the drum; and a dynamic absorber
installed at the tub to directly reduce vibration delivered to the
tub, wherein the dynamic absorber comprises: a mass body provided
with a hinge axis connecting part connectively formed thereto; an
elastic member configured to movably and rotatably support the mass
body; a fixation bracket installed at a predetermined position at
an upper surface of the tub to fix the elastic member; and a hinge
apparatus installed at a predetermined distance from the fixation
bracket to rotatably support the mass body, wherein the hinge
apparatus comprises: a hinge bracket fixed to the tub; a hinge
groove having a hollow core and formed at an inside the hinge
bracket; and a hinge axis corresponding to the hinge groove, formed
on the hinge axis connecting part and coupled to the hinge groove
to fix the hinge axis connecting part to the hinge groove.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the priority benefit of Korean
Patent Application No. 10-2011-0117287, filed on Nov. 11, 2011 in
the Korean Intellectual Property Office, the disclosure of which is
incorporated herein by reference.
BACKGROUND
[0002] 1. Field
[0003] The following description relates to a drum washing machine
having a dynamic absorber capable of reducing vibration
thereof.
[0004] 2. Description of the Related Art
[0005] A drum washing machine is an apparatus capable of washing a
laundry using electricity, and generally includes a tub configured
to store washing water therein, a drum rotatably installed at an
inside the tub and configured to accommodate laundry at an inside
thereof, and a driving apparatus configured to drive the rotation
of the drum, and the laundry is performed by the rotation of the
drum by the driving apparatus.
[0006] However, the force generated during the rotation of the drum
is delivered to the tub surrounding the drum, thereby generating
vibration.
[0007] In order to reduce the vibration as such, a ball balancer
may be provided. However, in a case when a ball is positioned in
the same direction as the laundry at the uneven state during a
transient state, that is, a range prior to the natural frequency of
a system, the ball may cause the imbalance, resulting in increased
vibration.
[0008] In addition, a dynamic absorber may be installed to the body
and the tub of a drum washing machine in order to ease the
vibration and noise of the tub as such. However, the natural
frequency of the dynamic absorber is to reduce the vibration of a
high frequency band, and thereby the vibration of a low frequency
band may not be reduced.
[0009] In addition, in a case of a large-capacity drum washing
machine, as the length of the tub is increased along with the
increase of the capacity of the drum, the horizontal vibration of
the rear surface of the tub is intensified during a resonance
period at an initial stage of a spin-dry process, and thus, the
horizontal vibration of the tub may result in a collision with the
body of a drum washing machine.
SUMMARY
[0010] Therefore, it is an aspect of the present disclosure to
provide a drum washing machine having a dynamic absorber capable of
reducing the vibration of a low frequency band.
[0011] It is another aspect of the present disclosure to provide a
drum washing machine capable of reducing the gap distance between a
frame and a tub by reducing the excessive vibration of the tub,
thereby increasing the washing capacity thereof.
[0012] Additional aspects of the disclosure will be set forth in
part in the description which follows and, in part, will be
apparent from the description, or may be learned by practice of the
disclosure.
[0013] In accordance with an embodiment of the present disclosure,
a drum washing machine includes a body, a drum, a tub, and a
dynamic absorber. The drum may be rotatably installed at an inside
the body. The tub may be installed to vibrate while surrounding the
drum. The dynamic absorber may be installed at the tub to directly
reduce vibration delivered to the tub. The dynamic absorber may
include a mass body, and an elastic member configured to
elastically support the mass body for the mass body to move toward
the direction of the vibration of the tub to reduce the vibration
of the tub.
[0014] The drum washing machine may further include a fixation
bracket that may be installed at the tub and configured to fix the
elastic member. The fixation bracket may include a first fixation
bracket installed at one side of a rear side of the tub and a
second fixation bracket installed while laterally opposing the
first fixation bracket.
[0015] The elastic member may include a first elastic member
configured to connect between the first fixation bracket and the
mass body, and a second elastic member configured to connect
between the second fixation bracket and the mass body.
[0016] The drum washing machine may further include a friction
reducing part configured to minimize friction of the mass body that
is moved by the elastic member.
[0017] The friction reducing part may include a first slide rail, a
second slide rail and a plurality of balls. The first slide rail
may be formed at the tub. The second slide rail may be installed at
a bottom surface of the mass body to correspond to the first slide
rail. The plurality of balls may be provided in between the first
slide rail and the second slide rail.
[0018] The mass body may include a through-hole formed at a center
thereof. The drum washing machine may further include a shaft and a
plurality of spherical members. The shaft may be configured to pass
through the through-hole of the mass body and connect in between
the first fixation bracket and the second fixation bracket. The
plurality of spherical members may be provided in between the shaft
and the through-hole, so that the mass body slidably moves through
the shaft and the plurality of spherical member.
[0019] The mass body may be elastically supported at one side and
the other side thereof by an elastic member, for example, a spring.
The spring may be installed at an outer circumferential surface of
the shaft, and include a first spring connectively installed at the
first fixation bracket and a second spring connectively installed
at the second fixation bracket.
[0020] At least one of the first fixation bracket and the second
fixation bracket may include a hinge apparatus. One side of the
mass body may be rotatably fixed by the hinge apparatus, and the
other side of the mass body may be movably installed so as to be
moved in a direction toward left and right sides of the tub by the
elastic member.
[0021] The dynamic absorber may include a casing, a mass body, a
plurality of elastic member and a friction reducing part. The
casing may form an exterior of the dynamic absorber while being
fixed to the tub. The mass body may be provided at an inside the
casing. The plurality of elastic members may be fixed to the casing
and the mass body to support the mass body. The friction reducing
part may be configured to reduce friction of the mass body that is
moved by the elastic member. The friction reducing part may include
oil provided at an inside the casing.
[0022] In accordance with another aspect of the present disclosure,
a drum washing machine includes a body, a drum, a tub, and a
dynamic absorber. The drum may be rotatably installed at an inside
the body. The tub may be installed to vibrate while surrounding the
drum. The dynamic absorber may be installed at the rub to directly
reduce the vibration delivered to the tub. The dynamic absorber may
include a mass body, an elastic member, a fixation bracket and a
friction reducing part. The elastic member may elastically support
the mass body. The fixation bracket may be installed at the tub and
configured to fix the elastic member. The friction reducing part
may be provided to minimize friction of the mass body that is moved
by the elastic member.
[0023] The dynamic absorber may be movably installed at a rear side
of the tub so as to be moved to a left and a right side of the tub
to reduce a left-to-right vibration of the tub.
[0024] The fixation bracket may include a first fixation bracket
installed at a rear side of the tub and a second fixation bracket
installed while opposing the first fixation bracket.
[0025] The elastic member may include a first elastic member
configured to connect between the first fixation bracket and the
mass body, and a second elastic member configured to connect
between the second fixation bracket and the mass body. The mass
body may be movably installed to move in a direction toward left
and right sides of the tub by the plurality of elastic members.
[0026] The friction reducing part may include a first slide rail
formed at the tub, a second slide rail installed at a bottom
surface of the mass body to correspond to the first slide rail, and
a plurality of balls provided in between the first slide rail and
the second slide rail.
[0027] The mass body may further include a through-hole formed at a
center thereof. The drum washing machine may further include a
shaft configured to pass through the through-hole of the mass body
and connect in between the first fixation bracket and the second
fixation bracket, and a plurality of spherical members provided in
between the shaft and the through-hole, so that the mass body moves
in a direction toward the left and the right side of the tub
through the shaft and the plurality of spherical members.
[0028] The mass body may be elastically supported at one side and
the other side thereof by an elastic member such as a spring. The
spring may be installed at an outer circumferential surface of the
shaft, and include a first spring connectively installed at the
first fixation bracket and a second spring connectively installed
at the second fixation bracket.
[0029] The fixation bracket may include a plurality of elastic
members configured to elastically support the mass body.
[0030] As described above, the vibration of a low frequency band at
which excessive vibration occurs may be reduced.
[0031] In addition, by reducing the excessive vibration of a tub,
the gap between a frame and a tub may be reduced, and accordingly,
a washing capacity may be increased.
BRIEF DESCRIPTION OF THE DRAWINGS
[0032] These and/or other aspects of the disclosure will become
apparent and more readily appreciated from the following
description of embodiments, taken in conjunction with the
accompanying drawings of which:
[0033] FIG. 1 is a cross-sectional view schematically illustrating
a drum washing machine in accordance with an embodiment of the
present disclosure.
[0034] FIG. 2 is a drawing schematically illustrating a drum
washing machine provided with a dynamic absorber installed thereto
in accordance with an embodiment of the present disclosure.
[0035] FIG. 3 is an exploded perspective view schematically
illustrating a dynamic absorber in accordance with an embodiment of
the present disclosure.
[0036] FIG. 4 is a drawing schematically illustrating an operation
of a dynamic absorber in accordance with an embodiment of the
present disclosure.
[0037] FIG. 5 is a perspective view schematically illustrating a
dynamic absorber in accordance with another embodiment of the
present disclosure.
[0038] FIG. 6 is a drawing schematically illustrating an operation
of a dynamic absorber in accordance with another embodiment of the
present disclosure.
[0039] FIGS. 7 to 14 are drawings schematically illustrating a
dynamic absorber in accordance with other embodiments of the
present disclosure.
DETAILED DESCRIPTION
[0040] Reference will now be made in detail to embodiments of the
present disclosure, examples of which are illustrated in the
accompanying drawings, wherein like reference numerals refer to
like elements throughout.
[0041] As illustrated on FIGS. 1 to 2, a drum washing machine 1
includes a body 10 forming an exterior, a tub 12 suspendedly
installed by a plurality of elastic members 18 such as a spring, at
an inside the body 10 and supportively installed by a damper
assembly 17 at the same time, a drum 11 rotatably installed at an
inside the tub 12 and configured to have washing water and laundry
therein, and a driving apparatus 15 to rotate the drum 11.
[0042] The tub 12 includes a front tub 12a having an open front
surface and a rear tub 12b coupled to the front tub 12a and
provided to surround the rear side of the drum 11.
[0043] The upper side of the inner portion of the body 10 is
provided with a detergent supply apparatus 13 installed therein to
accommodate the detergent supplied to an inside the drum 11 and
with a water supply apparatus 14 installed therein to supply water
to the detergent supply apparatus 13.
[0044] The water supply apparatus 14 is installed at an upper side
of the tub 12 and is provided to supply washing water to an inner
side of the tub 12 and the drum 11, and includes a water supply
valve 14a connected to an outside water supply part (not shown) and
a water supply pipe 14b configured to connect in between the water
supply valve 14a and the detergent supply apparatus 13.
[0045] The water supplied through the water supply valve 14a passes
through the detergent supply apparatus 13, and is supplied to an
inside the tub 12 along with the detergent.
[0046] In addition, a lower side of the tub 12 is provided with a
drain apparatus 16 installed thereto, and the drain apparatus 16
includes a drain pump 16a configured to drain the washing water to
an outside the body 10 and a drain pipe 16b.
[0047] As the drum washing machine 1 is operated after inserting
laundry into the drum 11, the washing water along with the
detergent is supplied into the drum 11 through the water supply
pipe 14b and the detergent supply apparatus 13, and then the
laundry is being washed as the drum 11 rotates by the driving
apparatus 15.
[0048] In addition, after a washing cycle is completed, the drum 11
rotates at a high speed, and the laundry is spin-dried. During the
spin-dry cycle , the drum 11 rotates at a high speed, and a
centrifugal force is developed in proportion to the uneven mass in
a lump state, thereby causing the tub 12 of the drum washing
machine 1 to vibrate.
[0049] Thus, in order to reduce the vibration of the tub 12, a
dynamic absorber 20 is installed.
[0050] The fundamental and the effect of the dynamic absorber 20
are schematically described hereinafter.
[0051] A machinery body m1, which is the subject to the reduction
of vibration, vibrates while installed at an elastic body k1. As to
decrease the vibration developed from the machinery body m1, a
dynamic absorber m2 is coupled to the machinery body ml through an
elastic body k2.
[0052] As to decrease the vibration frequency developed from the
machinery body m1, the natural frequency of the dynamic absorber m2
may match with the vibration frequency of the machinery body
m1.
[0053] As the natural frequency of the dynamic absorber m2 and the
vibration frequency developed from the machinery body m1 are
matched to each other, the vibration energy of the machinery body
m1 is absorbed by the dynamic absorber m2, thereby minimizing the
vibration of the machinery body m1. Thus, by establishing the
resonance points of the two mass bodies same, an additional mass
body, that is, the dynamic absorber m2, vibrates in place of a main
mass body, that is, the machinery body m1, and reduces the
vibration of the machinery body m1.
[0054] Here, the natural frequency is determined according to the
following formula:
.omega..sub.n(k/m).sup.1/2
[0055] At this time, .omega..sub.n represents a natural frequency,
k represents an elastic coefficient, and m represents mass.
[0056] As seen from the above formula , the elastic coefficient k
or the mass m is may be variably changed in order to variably
change the natural frequency of the dynamic absorber.
[0057] However, the dynamic absorber in general is configured to
reduce a high frequency vibration, as a mass body having a light
weight conducts a simple harmonic motion to reduce vibration.
[0058] An embodiment of the present disclosure is to reduce a low
frequency vibration, in other words, to establish the elastic
coefficient k of the spring, that is, the spring that vibrates a
mass body 21 having a mid weight, at a lower level.
[0059] As illustrated on FIGS. 3 to 4, the dynamic absorber 20
according to an embodiment of the present disclosure is installed
at an upper surface of the outer side of the rear tub 12b.
[0060] The dynamic absorber 20 includes the mass body 21 having a
mid weight, an elastic member 40 configured to movably rotatably
support the mass body 21 and having a low elastic coefficient k,
and a fixation bracket 30 to fix the elastic member 40.
[0061] The mass body 21 is installed, while being able to move in a
direction toward the left and the right side of the tub 12, to
reduce the vibration of the tub 12.
[0062] The elastic member 40 may include at least one of a spring
or a rubber. However, the elastic member 40 is not limited thereto.
For example, any material used to store mechanical energy and be
compressed or stretched may be used as the elastic member.
[0063] The elastic member 40 has one end thereof fixed to the mass
body 21 and the other end thereof fixed to the fixation bracket 30
to elastically support the mass body 21.
[0064] The fixation bracket 30 includes a first fixation bracket 31
fixed to one side of the rear tub 12b and a second fixation bracket
32 fixedly installed while laterally opposing the first fixation
bracket 31.
[0065] The first fixation bracket 31 and the second fixation
bracket 32 are installed at the left and the right side of the tub
12 while spaced apart in a predetermined distance from each
other.
[0066] Thus, the elastic member 40 includes a first elastic member
41 connected in between the first fixation bracket 31 and the mass
body 21 and configured to elastically support one side of the mass
body 21, and a second elastic member 42 connected in between the
second fixation bracket 32 and the mass body 21 and configured to
elastically support the other side of the mass body 21.
[0067] In addition, a friction reducing part 50 configured to
minimize friction is provided so that the elastic member 40 having
a low elastic coefficient k may be able to smoothly move the mass
body 21.
[0068] The friction reducing part 50 includes a first slide rail 51
installed at the tub 12, a second slide rail 52 installed at a
bottom surface of the mass body 21 to correspond to the first slide
rail 51, and a plurality of balls 53 provided in between the first
slide rail 51 and the second slide rail 52.
[0069] Thus, when the tub 12 vibrates during a transient period of
the spin-dry cycle of the drum washing machine 1, the mass body 21
of the dynamic absorber 20 installed at the rear tub 12b moves in a
direction A, that is, toward the left and the right sides of the
tub 12, and may reduce the excessive but temporary vibration of the
tub 12. The dynamic absorber 20 is configured not to move other
than during the transient period of the spin-dry cycle of the drum
washing machine 1. During the transient period of the spin-dry
cycle of the drum washing machine 1, the dynamic absorber 20,
instead of the tub 12, moves in the direction A, that is, toward
the left and the right sides of the tub 12, to absorb the vibration
of the tub 12.
[0070] At this time, the friction in between the mass body 21 and
the tub 12 may be minimized by the friction reducing part 50, and
the friction reducing part 50 is configured to guide the movement
of the mass body 21 in order to move the mass body 21 having a mid
weight by using the low elastic coefficient k.
[0071] Thus, the dynamic absorber 20 of an embodiment of the
present disclosure may be able to move the mass body 21 having a
mid weight by using a low elastic coefficient k, thereby directly
reducing low frequency vibration.
[0072] In addition, the dynamic absorber 20 may be able to reduce
the excessive vibration of the tub 12, thereby reducing the gap
distance in between the body 10 and the tub 12, so that the size of
the drum 11 may be enlarged as much as the reduced gap distance,
and therefore, the washing capacity of the drum washing machine 1
may be enhanced.
[0073] As illustrated on FIGS. 5 to 6, the dynamic absorber 20
according to another embodiment of the present disclosure includes
the mass body 21 having a mid weight and provided at a center
thereof with a through-hole 22 formed therethrough, a shaft 60
provided to penetrate the through-hole 22 of the mass body 21, a
first fixation bracket 31 and a second fixation bracket 32 fixedly
installed at the tub 12 to support both end portions of the shaft
60, and an elastic member 40 such as a spring provided to
elastically support the mass body 21 in between the first and the
second fixation brackets 31 and 32 and the mass body 21.
[0074] The outer circumferential surface of the shaft 60 is
provided at a middle portion thereof with grooves 61 formed thereon
while indented in a circumferential direction thereof, and a
plurality of spherical members 63 are installed at the grooves
61.
[0075] The first fixation bracket 31 and the second fixation
bracket 31 are provided with a shaft supporting part 33 formed
thereon to support the both end portions of the shaft 60.
[0076] Thus, the shaft 60 is penetratively installed through the
through-hole 22 of the mass body 21, and the both end portions of
the shaft 60 are fixed through the shaft supporting part 33 of the
first and the second fixation brackets 31 and 32.
[0077] In addition, the spring 40, which is configured to
elastically support the mass body 21 in order for the mass body 21
to move in a direction toward the left and the right side of the
tub 12, is installed at an outer circumferential surface of the
shaft 60, and includes a first spring 41 configured to support the
first fixation bracket 31 and one side of the mass body 21, and a
second spring 42 configured to support the second fixation bracket
32 and the other side of the mass body 21.
[0078] Thus, the mass body 21 is installed to be able to move in
the direction A, that is, toward the left and the right sides of
the tub 12 through the shaft 60, and is elastically supported by
the first spring 41 and the second spring 42.
[0079] The friction in between the mass body 21 and the shaft 60
may be reduced by the plurality of spherical members 63 provided in
between the mass body 21 and the shaft 60.
[0080] According to the dynamic absorber 20 as such, the friction
in between the mass body 21 and the tub 12 may be reduced by using
the plurality of spherical members 63, as well as the shaft 60
configured to guide the movement of the mass body 21 so that the
mass body 21 having a mid weight may be supported by the spring 60
having low elastic coefficient k, and thus the low frequency
vibration of the tub 12 may be reduced.
[0081] As illustrated on FIG. 7, the dynamic absorber 20 according
to another embodiment of the present disclosure includes the mass
body 21 having a mid weight, the elastic member 40 configured to
movably rotatably support the mass body 21 and having a low elastic
coefficient k, a fixation bracket 30 to fix the elastic member 40,
and a hinge apparatus 70 rotatably to support the mass body 21.
[0082] The fixation bracket 30 may be installed at a predetermined
position at an upper surface of the rear tub 12b to fix the elastic
member 40.
[0083] The hinge apparatus 70 is installed while being spaced apart
from the fixation bracket 30 in a predetermined distance in a
horizontal direction B of the tub 12.
[0084] The hinge apparatus 70 includes a hinge bracket 71 fixed to
the tub 12 and a hinge groove 72 formed at an inside the hinge
bracket 71 while having a hollow core.
[0085] One side of the mass body 21 is provided with a hinge axis
connecting part 23 connectively formed thereto. A hinge axis 24
corresponding to the hinge groove 72 is formed on the hinge axis
connecting part 23.
[0086] Thus, as the hinge axis 24 of the mass body 21 is coupled to
the hinge groove 72 of the hinge apparatus 70, the hinge axis
connecting part 23 of the mass body 21 is fixed to the hinge groove
72 of the hinge apparatus 70.
[0087] In this manner, one side of the mass body 21 is rotatably
fixed by the hinge apparatus 70 and the other side of the mass body
21 is rotatably installed to be able to move by the elastic member
40 in the direction B, that is, toward the left and the right sides
of the tub 12, and thus, in a case of the vibration of the tub 12
occurs, the mass body 21 of the dynamic absorber 20 moves toward
the left and the right sides of the tub 12, thereby reducing the
excessive but temporary vibration of the tub 12.
[0088] The movement of the dynamic absorber 20 in reducing the
excessive vibration is described according to the structure shown
above, thus the description will be omitted in order to avoid
redundancy.
[0089] As illustrated on FIG. 8, the dynamic absorber 20 according
to another embodiment of the present disclosure includes a casing
27, a first mass body 25a having a shape of a roller and fixed to
one side of the inside of the casing 27 to be elastically supported
by a plurality of elastic members 40, a second mass body 25b having
a shape of a roller and fixed to the other side of the inside of
the casing 27 to be elastically supported by the plurality of
elastic members 40, and a guide 57 having a shape of a panel and
installed in between the first mass body 25a and the second mass
body 25b.
[0090] Each of the plurality of elastic members 40 configured to
fix the first mass body 25a and the second mass body 25b to the
casing 27 is provided to elastically support the first mass body
25a and the second mass body 25a, which is connected a respective
one of the plurality of elastic members 40, toward an outer
direction of the casing 27.
[0091] Thus, the direction of the movements of the first mass body
25a and the second mass body 25a may be same.
[0092] The guide 57 is provided between the first mass body 25a and
the second mass body 25b in the form of a band having a shape of a
letter `S` and is configured to elastically support the first mass
body 25a and the second mass body 25a toward an inner side
direction thereof, so that the first mass body 25a and the second
mass body 25a are not spaced apart from each other.
[0093] At this time, the guide 57 may minimize the friction in
between the first mass body 25a and the second mass body 25b, and
thus, the low frequency vibration therein between may be
reduced.
[0094] The casing 27 is installed at an upper surface of the rear
tub 12b, and is capable of having the first mass body 25a and the
second mass body 25b at an inside thereof move toward direction A,
that is, the left and the right sides of the tub 12.
[0095] The movement of the dynamic absorber 20 in reducing the
excessive vibration according to the structure described above may
be sufficiently predicted from the description explained above,
thus the description will be omitted in order to avoid
redundancy.
[0096] As illustrated on FIG. 9, the dynamic absorber 20 according
to another embodiment of the present disclosure includes the casing
27, a mass body 21b having a shape of a disc and fixed to an inside
of the casing 27 to be elastically supported by a plurality of
elastic members 40, and oil O to minimize the friction of the mass
body 21b.
[0097] The casing 27 is provided with a hollow core formed therein
and is formed in a shape of a hexahedron having an open upper
surface thereof. A panel 27a is coupled to the open upper surface
of the casing 27 to close off from an outside thereof.
[0098] At this time, the panel 27a may be formed with transparent
material to check an inside the casing 27.
[0099] The casing 27 is provided at each corner thereof with an
elastic member supporting part 27b to which the plurality of
elastic members 40 may be fixed.
[0100] The mass body 21b having a shape of a disc may be formed at
a mid-weight level, while the elastic coefficient k of the elastic
member 40 supporting the mass body 21b may be at a low level.
[0101] At this time, the friction in between the mass body 21b and
the casing 27 is minimized by the oil O.
[0102] Thus, the mass body 21 b having a mid weight may be moved by
using a low elastic coefficient k, thereby reducing the low
frequency vibration of the tub 12.
[0103] In addition, the dynamic absorber 20 according to an
embodiment of the present disclosure may be configured to enable a
mass body 21c, a mass body 21d, and a mass body 21e to move not
only in the direction B, that is, toward the left and the right
sides of the tub 12, but also in all directions, and therefore, the
dynamic absorber 20 may be installed in various directions
depending on the displacement direction intended to reduce
vibration.
[0104] As illustrated on FIGS. 10 to 12, the dynamic absorber 20
according to other embodiments of the present disclosure includes
the mass body 21c, the mass body 21d, and the mass body 21e having
a mid weight and various shapes, and the elastic member 40
configured to elastically support the mass body 21c, the mass body
21d, and the mass body 21e so that the mass body 21c, the mass body
21d, and the mass body 21e may be capable of moving.
[0105] The elastic member 40 may include at least one of a spring
or a rubber.
[0106] The shapes of the mass body 21c, the mass body 21d, and the
mass body 21e may be provided in various shapes. However, the
shapes of the mass body 21c, the mass body 21d, and the mass body
21e may be provided in a horizontal state while being elastically
supported by the elastic member 40.
[0107] The mass body 21c is elastically supported by the plurality
of elastic members 40 that are provided at a bottom surface of the
mass body 21c and includes a rubber column having a shape of a
cylinder (see FIG. 10).
[0108] In addition, the mass body 21d is provided at a central
portion of the upper surface thereof with a supportive protrusion
21d' connected to the elastic member 40. The elastic member 40
including a plurality of rubber bands may be connectively installed
to the supportive protrusion 21d'.
[0109] At this time, the elastic member 40 is connectively
installed at the fixation bracket 30 which is fixed to the tub 12,
and the fixation bracket 30 may be provided at a predetermined
height allowing the mass body 21d to be suspended (see FIG.
11).
[0110] In addition, the mass body 21e is elastically supported by
the plurality of elastic members 40 that are provided at a bottom
surface of the mass body 21e, and includes a spring column (see
FIG. 12).
[0111] Thus, the mass body 21c, the mass body 21d, and the mass
body 21e having a mid weight may be moved by using a low elastic
coefficient k, thereby reducing the low frequency vibration of the
tub 12.
[0112] In addition, the dynamic absorber 20 according to other
embodiments of the present disclosure is configured to enable the
mass body 21c, the mass body 21d, and the mass body 21e to move not
only in the direction B, that is, toward the left and the right
sides of the tub 12, but also in all directions, and therefore, the
dynamic absorber 20 may be installed in various directions
depending on the displacement direction intended to reduce
vibration.
[0113] Thus, the dynamic absorber 20 may be variably installed
other than at the rear tub 12b.
[0114] The movement of the dynamic absorber 20 in reducing the
excessive vibration according to the structure described above may
be sufficiently predicted from the description explained above,
thus the description will be omitted in order to avoid
redundancy.
[0115] As illustrated on FIG. 13, the dynamic absorber 20 according
to another embodiment of the present disclosure includes a mass
body 21f having a mid weight, the fixation bracket 30 to support
the bottom surface of the mass body 21f, and the elastic member 40
to elastically support the mass body 21f.
[0116] The mass body 21f is provided at a center thereof with a
hollow hole 22a formed thereon, and the elastic member 40 is
installed at the hollow hole 22a.
[0117] The elastic member 40 includes a circular part 40a formed in
a shape of a ring to be capable of surrounding the water supply
pipe (not shown) that is connected at the upper side of the tub 12,
and a supporting part 40b connecting in between the circular part
40a and the mass body 21f.
[0118] Thus, the dynamic absorber 20 having the structure as
described above has a structure capable of not only moving the mass
body 21f in the direction B, that is, toward the left and the right
sides of the tub 12, but also in all directions and therefore, the
dynamic absorber 20 may be installed in various directions
depending on the displacement direction intended to reduce
vibration.
[0119] In addition, no additional space may be needed in installing
the dynamic absorber 20 as the dynamic absorber 20 is installed at
the water supply pipe (not shown) connected to the upper side of
the tub 12, and thereby the efficient use of the space thereof may
be achieved.
[0120] The movement of the dynamic absorber 20 in reducing the
excessive vibration according to the structure described above may
be sufficiently predicted from the description explained above,
thus the description will be omitted in order to avoid
redundancy.
[0121] As illustrated on FIG. 14, the dynamic absorber 20 according
to another embodiment of the present disclosure is installed at a
lower portion of the tub 12.
[0122] The dynamic absorber 20 includes a mass body 21g having a
mid weight, and a hinge apparatus 80 to hinge the mass body 21g to
the tub 12.
[0123] The hinge apparatus 80 includes a hinge link unit 83 which
includes a first hinge link 81 rotatably connected to the tub 12
and a second hinge link 82 rotatably connected to the first hinge
link 81 and the mass body 21g. The hinge apparatus 80 may include a
plurality of hinge link units. For example, FIG. 14 shows the hinge
apparatus having a pair of hinge link units. Further, although FIG.
14 shows the hinge link unit includes only two hinge links, a
number of hinge links are not limited thereto. The hinge link unit
may include one or more hinge links. For example, the hinge link
unit may have a third hinge link (not shown) rotatably connected to
the second hinge link 82 and the mass body 21g. In this example,
the second hinge unit is rotatably connected to the first hinge
link 81 and the third hinge link.
[0124] The second hinge link 82 is rotatably connected to the mass
body 21g.
[0125] Thus, the dynamic absorber 20, in a case when the tub 12
vibrates, may be able to move in the direction A, that is, toward
the left and the right sides of the tub 12, by the first hinge link
81 and the second hinge link 82 that are connected to the tub
12.
[0126] The dynamic absorber 20 as the above may be able to reduce
the left-to-right vibration of the tub 12, and may be installed at
the front or the rear of the tub 12.
[0127] The movement of the dynamic absorber 20 in reducing the
excessive vibration according to the structure described above may
be sufficiently predicted from the description explained above,
thus the description will be omitted in order to avoid
redundancy.
[0128] Although a few embodiments of the present disclosure have
been shown and described, it would be appreciated by those skilled
in the art that changes may be made in these embodiments without
departing from the principles and spirit of the disclosure, the
scope of which is defined in the claims and their equivalents.
* * * * *