JP2911234B2 - Drum type washing machine - Google Patents
Drum type washing machineInfo
- Publication number
- JP2911234B2 JP2911234B2 JP3019273A JP1927391A JP2911234B2 JP 2911234 B2 JP2911234 B2 JP 2911234B2 JP 3019273 A JP3019273 A JP 3019273A JP 1927391 A JP1927391 A JP 1927391A JP 2911234 B2 JP2911234 B2 JP 2911234B2
- Authority
- JP
- Japan
- Prior art keywords
- washing machine
- rubber cushion
- vibration
- main body
- natural frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000005406 washing Methods 0.000 title claims description 65
- 229920001971 elastomer Polymers 0.000 claims description 67
- 229920003225 polyurethane elastomer Polymers 0.000 claims description 16
- 230000018044 dehydration Effects 0.000 claims description 15
- 238000006297 dehydration reaction Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 13
- 238000009987 spinning Methods 0.000 description 9
- 230000007423 decrease Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は洗濯機本体の振動を低減
するゴムクッションを前記洗濯機本体の脚部に備えた洗
濯機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine in which a rubber cushion for reducing vibration of the washing machine body is provided on a leg of the washing machine body.
【０００２】[0002]
【従来の技術】洗濯機の振動は、洗濯機に備えられた脱
水槽等の回転体の中に収容された洗濯物の偏心によって
生じる振動がその主因となっている。このような洗濯機
の振動は、洗濯機が置かれた床に伝わるが、該床が洗濯
機の振動に共振すると、この共振によって洗濯機の振動
が増大するという問題があった。このような共振は、木
製の床及び樹脂製の洗濯パン等、強度が低く、撓み易い
床構造物の上に洗濯機が置かれた場合に顕著に現れてい
た。2. Description of the Related Art Vibration of a washing machine is mainly caused by eccentricity of laundry stored in a rotating body such as a dehydration tub provided in the washing machine. Such vibration of the washing machine is transmitted to the floor on which the washing machine is placed. However, when the floor resonates with the vibration of the washing machine, there is a problem that the vibration of the washing machine increases due to the resonance. Such resonance has been remarkably exhibited when the washing machine is placed on a low-strength and flexible floor structure such as a wooden floor and a resin washing pan.
【０００３】このような共振を抑止するため、従来で
は、洗濯機本体の下面の脚部に所定の形状及び硬度のゴ
ムクッションを取付け、該ゴムクッションによって洗濯
機本体から床構造物へ伝達する振動を低減していた。Conventionally, in order to suppress such resonance, a rubber cushion having a predetermined shape and hardness is attached to a leg on the lower surface of the main body of the washing machine, and the vibration transmitted from the main body of the washing machine to the floor structure by the rubber cushion. Was reduced.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、前述の
如き従来のゴムクッションをその底面に取付けた洗濯機
を、強度が低くて撓み易い床構造物の上に置く場合、次
に示すような問題があった。図６はゴムクッションの硬
度が高い場合の脱水回転数と振動の振幅との関係を示す
グラフ、図７はゴムクッションの硬度が低い場合の脱水
回転数と振動の振幅との関係を示すグラフであり、図６
及び図７においては縦軸に振動の振幅、横軸に脱水回転
数を夫々とり、これらの関係を示してある。ゴムクッシ
ョンの硬度が高いと、図６に示す如く前記回転体の回転
数が脱水の設定回転数（例えば700rpm〜900rpm) Ｓの近
傍で、洗濯機の振動が急激に大きくなる傾向があった。
また、ゴムクッションの硬度が低いと、図７に示す如く
前記回転体の回転数が前記設定回転数Ｓに達するまでの
低回転数領域における床構造物との共振点の近傍で、洗
濯機の振動が大きくなる傾向があった。このように従来
のゴムクッションでは、強度が低くて撓み易い床構造物
の上に洗濯機を置いた場合の振動を十分に抑制すること
は困難であった。However, when a washing machine having the above-mentioned conventional rubber cushion attached to its bottom surface is placed on a low-strength and easily-flexible floor structure, the following problems arise. there were. FIG. 6 is a graph showing the relationship between the spinning speed and the amplitude of vibration when the hardness of the rubber cushion is high, and FIG. 7 is a graph showing the relationship between spinning speed and the amplitude of vibration when the hardness of the rubber cushion is low. Yes, Figure 6
In FIG. 7 and FIG. 7, the vertical axis represents the amplitude of the vibration, and the horizontal axis represents the spinning speed of dehydration. If the hardness of the rubber cushion is high, the vibration of the washing machine tends to increase sharply when the rotation speed of the rotating body is close to the set rotation speed (for example, 700 rpm to 900 rpm) S for dehydration as shown in FIG.
Further, when the hardness of the rubber cushion is low, as shown in FIG. 7, the washing machine closes at a resonance point with the floor structure in a low rotation speed region until the rotation speed of the rotating body reaches the set rotation speed S. Vibration tended to increase. As described above, with the conventional rubber cushion, it has been difficult to sufficiently suppress vibration when the washing machine is placed on a floor structure that has low strength and is easily bent.
【０００５】本発明は斯かる事情に鑑みてなされたもの
であり、強度が低くて撓み易い床構造物の上に洗濯機を
置いた場合の振動を低減することを可能とする洗濯機を
提供することを目的とする。The present invention has been made in view of the above circumstances, and provides a washing machine capable of reducing vibration when the washing machine is placed on a floor structure having low strength and being easily bent. The purpose is to do.
【０００６】[0006]
【課題を解決するための手段】本発明は、洗濯機本体の
振動を低減するゴムクッションを前記洗濯機本体の脚部
に備え、洗濯及び脱水を行うドラム式洗濯機において、
前記ゴムクッションは、脱水時の前記洗濯機本体の固有
振動数ｆとこのゴムクッションの固有振動数ｆｎとの比
ｆ／ｆｎが１．５以上となるものとし、且つその材質
を、その材料内部での内部摩擦が大きく、損失係数が大
きい粘弾性ポリウレタンエラストマーとしたことを特徴
とする。 This onset bright [Means for solving problems], with rubber cushion to reduce vibration of the washing machine main body to the leg portion of the washing machine main body, the drum-type washing machine for performing washing and dehydration,
Ratio of the rubber cushion, the natural frequency f of the washing machine main body at the time of dehydration natural frequency fn of the rubber cushion
f / fn is 1.5 or more, and its material
The internal friction inside the material is large and the loss factor is large.
A viscoelastic polyurethane elastomer is used .
【０００７】[0007]
【作用】粘弾性ポリウレタンエラストマーは、その内部
摩擦が大きく、損失係数が大きい材料であるので、脚部
における振動エネルギの吸収量が大きい。一般的なゴム
クッションの振動伝達率は、脱水時の洗濯機本体の固有
振動数ｆとゴムクッションの固有振動数ｆｎとの比ｆ／
ｆｎが略１．４以下では１００％よりも大きく、略１．
４以上になると、その比の増加に従って１００％から減
少する傾向がある。強度が低くて撓み易い床構造物（固
有振動数が低い）の上に洗濯機を置いた場合に、この床
構造物の共振を抑制して、洗濯機本体の振動を低減する
ためには、前記振動伝達率をできる限り低くしなければ
ならないが、実質的な振動伝達率の低減は、脱水時の洗
濯機本体の固有振動数ｆとゴムクッションの固有振動数
ｆｎとの比ｆ／ｆｎを１．５以上にすると実現される。
そして、振動伝達率をできる限り低減するためには、ゴ
ムクッションの固有振動数を低くすることが必要である
が、このためには、ゴムクッションのバネ定数、即ちこ
れに相当する硬度を低くすればよい。しかし、ゴムクッ
ションの硬度が低くなると、脱水時の設定回転数に達す
るまでの間の洗濯機本体の振動が大きくなってしまうの
で、せっかく振動伝達率が低くなっても、相当な振動が
床構造物に伝わり、やはり床構造物が共振しやすくなっ
てしまう。 本発明では、ゴムクッションの材質を粘弾性
ポリウレタンエラストマーとしており、前述の如く粘弾
性ポリウレタンエラストマーは、その内部摩擦が大き
く、損失係数が大きい材料であるので、振動エネルギの
吸収量が大きいため、洗濯機本体の振動エネルギが適当
に吸収され、洗濯機本体の過大な振動が生じない。Since the viscoelastic polyurethane elastomer is a material having a large internal friction and a large loss coefficient, a large amount of vibration energy is absorbed by the legs. General vibration transmission rate of the rubber cushion, the ratio between the natural frequency fn of the natural frequency f and a rubber cushion washer body during dehydration f /
fn is approximately 1. Greater than 100% in the 4 hereinafter, approximately 1.
4 becomes on than, it tends to decrease from 100% with an increase in the ratio. Floor structure with low strength and easy bending
When the washing machine is placed on the floor,
By suppressing the resonance of the structure, in order to reduce the vibration of the washing machine main body, the must be as low as possible the vibration transmissibility, reduce substantial vibration transmissibility, laundry during dehydration Natural frequency f of machine body and natural frequency of rubber cushion
The ratio f / fn to fn is 1. 5 is realized that on or more.
In order to reduce the vibration transmissibility as much as possible, it is necessary to lower the natural frequency of the rubber cushion. For this purpose, the spring constant of the rubber cushion,
The hardness corresponding to this may be reduced. However, rubber cook
If the hardness of the application becomes low, it reaches the set rotation speed during dehydration.
The vibration of the washing machine itself increases until
So, even if the vibration transmissibility is low, considerable vibration
It is transmitted to the floor structure, and the floor structure also easily resonates
Would. In the present invention, the material of the rubber cushion is viscoelastic
And a polyurethane elastomer, viscoelastic polyurethane elastomers as described above, the internal friction is large, since the loss factor is a large material, because of the large absorption of vibration energy, the vibration energy of the washing machine main body is properly absorbed, Excessive vibration of the washing machine body does not occur.
【０００８】[0008]
【実施例】以下本発明をその実施例を示す図面に基づい
て具体的に説明する。図１は本発明に係る洗濯機の模式
的縦断面図である。図中１は箱型の洗濯機本体であり、
該洗濯機本体１の内部には横軸ドラム状に形成された合
成樹脂製の水槽である外槽２が配設されている。外槽２
の内部には、洗濯及び脱水を行う横軸型のドラム３が前
記外槽２と同軸的に回動及び回転自在に配設されてい
る。洗濯機本体１内において外槽２の上部は弾性部材よ
りなる上部支持体４，４…（２つのみ図示）によって洗
濯機本体１の上部四隅から弾性的に吊下げ支持されてい
る。一方、外槽２の下部は、洗濯機本体１の底部に立設
した弾性部材よりなる下部支持体５，５…（２つのみ図
示）によって支持されている。また、洗濯機本体１の下
面四隅には、洗濯機本体１を支持する脚部６，６…（２
つのみ図示）が設けられている。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. FIG. 1 is a schematic longitudinal sectional view of a washing machine according to the present invention. In the figure, 1 is a box-shaped washing machine body,
Inside the main body 1 of the washing machine, an outer tub 2 which is a water tank made of a synthetic resin and formed in a horizontal axis drum shape is disposed. Outer tub 2
Inside, a drum 3 of a horizontal axis type for performing washing and dehydration is arranged rotatably and rotatably coaxially with the outer tub 2. The upper portion of the outer tub 2 in the washing machine main body 1 is elastically suspended and supported from upper four corners of the washing machine main body 1 by upper supports 4, 4... On the other hand, the lower portion of the outer tub 2 is supported by lower supports 5, 5,... (Only two are shown) made of an elastic member erected on the bottom of the washing machine main body 1. The four corners of the lower surface of the washing machine main body 1 are provided with legs 6, 6,.
(Only one is shown).
【０００９】図２は脚部６の拡大縦断面図である。図中
60は、粘弾性ポリウレタンエラストマー製の短寸円筒の
中心部に円形の凹部61を形成すると共に凹部61の径より
も小径の貫通孔62を形成してなるゴムクッションであ
り、前記凹部61内には環状の樹脂カラー63が挿入され
る。前記ゴムクッション60の粘弾性ポリウレタンエラス
トマーは、前述の如きドラム３の脱水回転時における洗
濯機の固有振動数ｆとゴムクッションの固有振動数ｆn
との振動数比ｆ／ｆn が1.5 以上のものを用いる。洗濯
機本体１の底部四隅には、前記貫通孔62と同一径の貫通
孔11が開設されている。前記ゴムクッション60は、洗濯
機本体１の底部下方から貫通孔62側及び貫通孔11に螺入
する取付ビス64によって、凹部61を下向きにした態様で
洗濯機本体１の下面四隅の夫々に取付けられる。FIG. 2 is an enlarged vertical sectional view of the leg 6. In the figure
Reference numeral 60 denotes a rubber cushion formed by forming a circular concave portion 61 at the center of a short cylinder made of a viscoelastic polyurethane elastomer and forming a through hole 62 having a diameter smaller than the diameter of the concave portion 61. The annular resin collar 63 is inserted. The viscoelastic polyurethane elastomer of the rubber cushion 60 has a natural frequency f of the washing machine and a natural frequency f n of the rubber cushion during the spinning of the drum 3 as described above.
Are used whose frequency ratio f / f n is 1.5 or more. At the four bottom corners of the washing machine main body 1, through holes 11 having the same diameter as the through holes 62 are formed. The rubber cushion 60 is attached to each of the four lower corners of the main body 1 of the washing machine 1 with the concave portion 61 facing downward by mounting screws 64 screwed into the through hole 62 and the through hole 11 from below the bottom of the main body 1 of the washing machine. Can be
【００１０】前記ゴムクッション60は粘弾性ポリウレタ
ンエラストマー製であるが、この粘弾性ポリウレタンエ
ラストマーは、その材料内部での内部摩擦が大きく、損
失係数が大きい（振動エネルギを吸収し易い）材料であ
り、洗濯及び脱水時に回転するドラム３を振動源として
生じる洗濯機本体１の振動エネルギを吸収するようにな
っている。The rubber cushion 60 is made of a viscoelastic polyurethane elastomer. The viscoelastic polyurethane elastomer is a material having a large internal friction inside the material and a large loss coefficient (easy to absorb vibration energy). The vibration energy of the washing machine main body 1 generated by using the rotating drum 3 as a vibration source during washing and spin-drying is absorbed.
【００１１】次に、ゴムクッション60を、振動数比ｆ／
ｆn が1.5 以上の粘弾性ポリウレタンエラストマー製に
した理由について説明する。図３は前述の如きドラム３
の脱水回転時における洗濯機の固有振動数ｆとゴムクッ
ションの固有振動数ｆn との振動数比ｆ／ｆn と、ゴム
クッションの振動伝達率との関係を示すグラフであり、
縦軸に振動伝達率、横軸に振動数比ｆ／ｆn をとり、こ
れらの関係を一般のゴム(NR,NBR,IIR 等) 製のゴムクッ
ションは実線、粘弾性ポリウレタンエラストマー製のゴ
ムクッション60は一点鎖線にて表す。Next, the rubber cushion 60 is moved to a frequency ratio f /
f n will be described why the steel of 1.5 or more viscoelastic polyurethane elastomers. FIG. 3 shows the drum 3 as described above.
Is a graph showing the frequency ratio f / f n of the natural frequency f n of the natural frequency f and a rubber cushion washer, the relationship between the vibration transmissibility of the rubber cushion during dehydration rotation,
Vibration transmissibility on the vertical axis, the horizontal axis represents the frequency ratio f / f n, rubber general these relationships (NR, NBR, IIR, etc.) rubber cushion made is solid, viscoelastic polyurethane elastomeric rubber cushion 60 is represented by a dashed line.
【００１２】図３から明らかな如く、一般のゴム製のゴ
ムクッション及び粘弾性ポリウレタンエラストマー製の
ゴムクッション60では、振動数比ｆ／ｆn が大きくなる
と、振動伝達率は、振動数比ｆ／ｆn が１になるまで10
0 ％を超えて増加するが、振動数比ｆ／ｆn が１の場合
をピークとして、減少する傾向があり、振動数比ｆ／ｆ
n が略1.4 にて振動伝達率は100 ％となり、それ以降は
振動数比ｆ／ｆn の増加に従って振動伝達率は100 ％か
らさらに減少していく。このように略1.4 以上の振動数
比ｆ／ｆn について考える場合、振動数比ｆ／ｆn が大
きい程、振動伝達率が小さくなる。即ち、洗濯機から床
構造物へ振動が伝わり難くなる傾向がある。As is apparent from FIG. 3, in a general rubber cushion and a rubber cushion 60 made of a viscoelastic polyurethane elastomer, as the frequency ratio f / f n increases, the vibration transmissibility increases. 10 until f n becomes 1
0%, but tends to decrease with the peak when the frequency ratio f / f n is 1;
When n is approximately 1.4, the vibration transmissibility becomes 100%, and thereafter, the vibration transmissivity further decreases from 100% as the frequency ratio f / f n increases. When considering the frequency ratio f / f n of about 1.4 or more as described above, the larger the frequency ratio f / f n is, the smaller the vibration transmissibility is. That is, the vibration is less likely to be transmitted from the washing machine to the floor structure.
【００１３】ゴムクッションの固有振動数ｆn は、下記
数１に示される式により、ゴムクッションのバネ定数
ｋ、ゴムクッションにかかる重量ｗ及び重力加速度ｇに
関連して表される。The natural frequency f n of the rubber cushion is expressed by the following equation 1 in relation to the spring constant k of the rubber cushion, the weight w applied to the rubber cushion, and the gravitational acceleration g.
【００１４】[0014]
【数１】 (Equation 1)
【００１５】前述の如く、洗濯機の洗濯機本体１から床
構造物への振動の伝達を抑制するためには、ゴムクッシ
ョンの固有振動数ｆn を小さくすることによって振動数
比ｆ／ｆn を大きくしなければならない。前記数１にお
いて、ゴムクッションの固有振動数ｆn を小さくするに
は、重量ｗを一定としてバネ定数ｋを小さくすればよ
い。しかし、一般のゴム製のゴムクッションでは、前述
の図６に示されるように、バネ定数ｋに相当する硬度を
低くすると、ドラム３が脱水時の設定回転数Ｓに達する
までの間の振動が大きくなるので、バネ定数ｋを小さく
することは不都合である。As described above, in order to suppress the transmission of vibration from the washing machine main body 1 of the washing machine to the floor structure, the vibration frequency ratio f / f n is reduced by reducing the natural frequency f n of the rubber cushion. Must be increased. In the above equation (1), the natural frequency f n of the rubber cushion can be reduced by reducing the spring constant k while keeping the weight w constant. However, in a general rubber cushion, as shown in FIG. 6 described above, when the hardness corresponding to the spring constant k is reduced, the vibration until the drum 3 reaches the set rotation speed S during dehydration is increased. It is inconvenient to reduce the spring constant k because it increases.
【００１６】一方、粘弾性ポリウレタンエラストマー製
のゴムクッション60では、バネ定数ｋを小さくした場合
でも、図４に示される如くドラム３が脱水の設定回転数
Ｓに達するまでの間の振動が大きくならない。図４はゴ
ムクッション60のバネ定数ｋを小さくした場合の脱水回
転数と振動の振幅との関係を示すグラフであり、縦軸に
振動の振幅、横軸に脱水回転数を夫々とり、これらの関
係を示してある。図４から明らかな如く、バネ定数ｋを
小さくした場合の粘弾性ポリウレタンエラストマー製の
ゴムクッション60は、ドラム３が同期回転数に達するま
での振動の振幅が小さく、ドラム３の回転数が変動して
も平均的に振動の振幅が小さい。これは、粘弾性ポリウ
レタンエラストマーは、その材料内部での内部摩擦が大
きく、損失係数が大きい（振動エネルギを吸収し易い）
材料であり、洗濯及び脱水時に回転するドラム３を振動
源として生じる洗濯機本体１の振動エネルギを吸収でき
るからである。また、前記ゴムクッション60の振動数比
ｆ／ｆn は、略1.4 よりも大きくならなければ振動伝達
率が100 ％よりも小さくならず、実質的に振動伝達率を
低くするためには、振動数比ｆ／ｆn を少なくとも1.5
以上にしなければならない。On the other hand, in the rubber cushion 60 made of a viscoelastic polyurethane elastomer, even when the spring constant k is reduced, the vibration does not increase until the drum 3 reaches the set rotation speed S for dehydration as shown in FIG. . FIG. 4 is a graph showing the relationship between the spinning speed and the vibration amplitude when the spring constant k of the rubber cushion 60 is reduced. The vertical axis indicates the vibration amplitude and the horizontal axis indicates the spinning speed. The relationship is shown. As is clear from FIG. 4, the rubber cushion 60 made of the viscoelastic polyurethane elastomer when the spring constant k is reduced has a small vibration amplitude until the drum 3 reaches the synchronous rotation speed, and the rotation speed of the drum 3 varies. Even on average, the amplitude of the vibration is small. This is because the viscoelastic polyurethane elastomer has a large internal friction inside the material and a large loss coefficient (easy to absorb vibration energy).
This is because it is a material and can absorb the vibration energy of the washing machine main body 1 generated by using the drum 3 that rotates during washing and dehydration as a vibration source. If the frequency ratio f / f n of the rubber cushion 60 does not become larger than approximately 1.4, the vibration transmissibility does not become smaller than 100%. The number ratio f / f n is at least 1.5
You have to do more.
【００１７】このような理由によって、ゴムクッション
60は、振動数比ｆ／ｆn が1.5 以上の粘弾性ポリウレタ
ンエラストマー製とする。For these reasons, rubber cushions
60 is made of a viscoelastic polyurethane elastomer having a frequency ratio f / f n of 1.5 or more.
【００１８】次に、本発明のその他の実施例について説
明する。図５は本発明のその他の実施例を示す洗濯機の
脚部６の拡大縦断面図であり、図５において図２と一致
するものには同番号を付しその説明を省略する。図中65
はゴムクッション60における洗濯機本体と接しない表面
を保護するゴムクッション保護用ゴムカバーである。ゴ
ムクッション60の前記表面はゴムクッション保護用ゴム
カバー65によって被覆され、このようにゴムクッション
保護用ゴムカバー65によって被覆されたゴムクッション
60が、取付ビス64によって、凹部61を下向きにした態様
でフレーム１の底部四隅の夫々に取付けられる。このよ
うに構成された脚部６はゴムクッション60がゴムクッシ
ョン保護用ゴムカバー65によって保護されるので、ゴム
クッション60の摩耗及び劣化が抑制される。Next, another embodiment of the present invention will be described. FIG. 5 is an enlarged vertical sectional view of a leg portion 6 of a washing machine showing another embodiment of the present invention. In FIG. 5, the same reference numerals as in FIG. 2 denote the same parts, and a description thereof will be omitted. In the figure 65
Is a rubber cover for protecting a rubber cushion 60 that protects a surface of the rubber cushion 60 that is not in contact with the washing machine body. The surface of the rubber cushion 60 is covered with the rubber cover 65 for protecting the rubber cushion, and thus the rubber cushion covered with the rubber cover 65 for protecting the rubber cushion.
The frame 60 is attached to each of the four bottom corners of the frame 1 with the concave portion 61 facing down by the mounting screw 64. Since the rubber cushion 60 is protected by the rubber cover 65 for protecting the rubber cushion 60 in the leg portion 6 configured as described above, wear and deterioration of the rubber cushion 60 are suppressed.
【００１９】[0019]
【発明の効果】以上詳述した如く、本発明に係るドラム
式洗濯機では、脚部に備えたゴムクッションを、脱水時
の洗濯機本体の固有振動数ｆとこのゴムクッションの固
有振動数ｆｎとの比ｆ／ｆｎが１．５以上となるものと
し、且つその材質を、その材料内部での内部摩擦が大き
く、損失係数が大きい粘弾性ポリウレタンエラストマー
としているので、脱水時の設定回転数に達するまでの間
の洗濯機本体の振動を大きくすることなく床構造物への
振動伝達率を低減でき、床構造物の共振を著しく抑制す
ることができる。従って、強度が低くて撓み易い床構造
物の上に洗濯物を置いた場合の振動を著しく低減するこ
とができる。 As described in detail above, the drum according to the present invention
In a washing machine, the rubber cushion on the leg
The natural frequency f of the washing machine body and the
The ratio f / fn to the frequency fn is 1.5 or more.
And the material has high internal friction inside the material.
Viscoelastic polyurethane elastomer with high loss factor
Until it reaches the set rotation speed during dehydration.
To the floor structure without increasing the vibration of the washing machine body
Vibration transmissibility can be reduced, and the resonance of the floor structure is significantly suppressed.
Can be Therefore, floor structure with low strength and easy bending
Significantly reduce the vibration when placing laundry on
Can be.
【図１】本発明に係る洗濯機の模式的縦断面図である。FIG. 1 is a schematic longitudinal sectional view of a washing machine according to the present invention.
【図２】洗濯機の脚部の拡大縦断面図である。FIG. 2 is an enlarged vertical sectional view of a leg of the washing machine.
【図３】ドラム３の脱水回転時における洗濯機の固有振
動数とゴムクッションの固有振動数との振動数比と、ゴ
ムクッションの振動伝達率との関係を示すグラフであ
る。FIG. 3 is a graph illustrating a relationship between a vibration frequency ratio between a natural frequency of a washing machine and a natural frequency of a rubber cushion when the drum 3 is spin-drying, and a vibration transmissibility of the rubber cushion.
【図４】ゴムクッションのバネ定数を小さくした場合の
脱水回転数と振動の振幅との関係を示すグラフである。FIG. 4 is a graph showing the relationship between the spinning speed and the amplitude of vibration when the spring constant of the rubber cushion is reduced.
【図５】本発明のその他の実施例を示す洗濯機の脚部の
拡大縦断面図である。FIG. 5 is an enlarged vertical sectional view of a leg of a washing machine showing another embodiment of the present invention.
【図６】ゴムクッションの硬度が高い場合の脱水回転数
と振動の振幅との関係を示すグラフである。FIG. 6 is a graph showing the relationship between the spinning speed and the amplitude of vibration when the hardness of the rubber cushion is high.
【図７】ゴムクッションの硬度が低い場合の脱水回転数
と振動の振幅との関係を示すグラフである。FIG. 7 is a graph showing the relationship between the spinning speed and the amplitude of vibration when the hardness of the rubber cushion is low.
１ 洗濯機本体 ６ 脚部 60 ゴムクッション 1 Washing machine body 6 Legs 60 Rubber cushion
Claims (1)
ョンを前記洗濯機本体の脚部に備え、洗濯及び脱水を行
うドラム式洗濯機において、 前記ゴムクッションは、脱水時の前記洗濯機本体の固有
振動数ｆとこのゴムクッションの固有振動数ｆｎとの比
ｆ／ｆｎが１．５以上となるものとし、且つその材質
を、その材料内部での内部摩擦が大きく、損失係数が大
きい粘弾性ポリウレタンエラストマーとしたことを特徴
とするドラム式洗濯機。1. A with rubber cushion to reduce vibration of the washing machine main body to the leg portion of the washing machine main body, the drum-type washing machine for performing washing and dewatering, the rubber cushion, the washing machine main body at the time of dehydration Of the natural frequency f of the rubber cushion to the natural frequency fn of the rubber cushion
f / fn is 1.5 or more, and its material
The internal friction inside the material is large and the loss factor is large.
Drum type washing machine which is characterized in that the hearing viscoelastic polyurethane elastomers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3019273A JP2911234B2 (en) | 1991-01-19 | 1991-01-19 | Drum type washing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3019273A JP2911234B2 (en) | 1991-01-19 | 1991-01-19 | Drum type washing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04236994A JPH04236994A (en) | 1992-08-25 |
| JP2911234B2 true JP2911234B2 (en) | 1999-06-23 |
Family
ID=11994844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3019273A Expired - Fee Related JP2911234B2 (en) | 1991-01-19 | 1991-01-19 | Drum type washing machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2911234B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL1950338T3 (en) * | 2007-01-25 | 2011-08-31 | Electrolux Home Products Corp Nv | Household appliance column assembly |
| CN106637849A (en) * | 2017-01-13 | 2017-05-10 | 湖南谭风网络技术有限公司 | Helical-motion damping washing machine |
| CN106637846A (en) * | 2017-01-13 | 2017-05-10 | 湖南谭风网络技术有限公司 | Combined type washing machine |
| CN106637848A (en) * | 2017-01-13 | 2017-05-10 | 湖南谭风网络技术有限公司 | Vibration-absorption washing machine |
| CN106637847A (en) * | 2017-01-13 | 2017-05-10 | 湖南谭风网络技术有限公司 | Automatic household small washing machine |
-
1991
- 1991-01-19 JP JP3019273A patent/JP2911234B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04236994A (en) | 1992-08-25 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |