EP0695824A1 - Antischwingungsmechanismus für Schwingungskörper - Google Patents

Antischwingungsmechanismus für Schwingungskörper Download PDF

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Publication number
EP0695824A1
EP0695824A1 EP94111978A EP94111978A EP0695824A1 EP 0695824 A1 EP0695824 A1 EP 0695824A1 EP 94111978 A EP94111978 A EP 94111978A EP 94111978 A EP94111978 A EP 94111978A EP 0695824 A1 EP0695824 A1 EP 0695824A1
Authority
EP
European Patent Office
Prior art keywords
damper
frame
clearance
vibrating body
connections
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.)
Granted
Application number
EP94111978A
Other languages
English (en)
French (fr)
Other versions
EP0695824B1 (de
Inventor
Mitsuhiro C/O Kabaya Kogyo K.K. Kashima
Hiroshi C/O Kabaya Kogyo K.K. Matsumoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KYB Corp
Original Assignee
Kayaba Industry Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to JP01494293A priority Critical patent/JP3234325B2/ja
Application filed by Kayaba Industry Co Ltd filed Critical Kayaba Industry Co Ltd
Priority to DE1994618460 priority patent/DE69418460T2/de
Priority to EP94111978A priority patent/EP0695824B1/de
Publication of EP0695824A1 publication Critical patent/EP0695824A1/de
Application granted granted Critical
Publication of EP0695824B1 publication Critical patent/EP0695824B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
    • D06F37/22—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations in machines with a receptacle rotating or oscillating about a horizontal axis

Definitions

  • This invention relates to an anti-vibration mechanism which supports a vibrating body such as a wash drum in a washing machine so as to attenuate its vibration by means of springs and dampers.
  • drum-type washing machines provided with a tank which rotates about a horizontal axis, a drum is suspended by means of springs inside a wash frame, this drum housing a wash tank.
  • the wash tank is rotated by means of a motor inside the wash frame via belts and pulleys.
  • the wash frame may resonate as the rotation speed of the tank increases, and this generates a large noise.
  • One method of attenuating this low frequency vibration consists of interposing a damper 90 between a drum 3 and a frame 1 as shown in Fig. 8. This damper 90 suppresses the low frequency vibration, and thereby prevents resonance of the drum 3.
  • this anti-vibration device requires a damper of complicated structure, a sensor and a controller, it has a complex construction which makes it costly.
  • it is moreover difficult to completely eliminate the damping effect and frictional resistance due to elongation arid contraction of the damper, and as the damper is operated at all vibration frequencies, it is not possible to completely shield the vibrating body from high frequency vibration.
  • the damper is constantly operating, its lifetime arid reliability are also affected by wear of moving parts and leaks from seals.
  • Jikkai Hei 4-77881 published by the Japanese Patent Office discloses an arrangement wherein a rod of the damper and an eye connected to the drum or frame, are linked by means of a lock mechanism using a detent driven by a solenoid.
  • this device also requires a controller it is costly, and the robustness of the detent-type lock mechanism is questionable.
  • the lock mechanism occupies a considerable space due to the solenoid, and it is difficult to eliminate the friction between the rod and eye to zero when the lock is released.
  • this invention provides an anti-vibration mechanism for a vibrating body enclosed in a frame comprising a spring and a damper.
  • the damper has connections with the vibrating body and frame,
  • the mechanism further comprises a mechanism for providing a clearance within predetermined limits in one of the connections, and a mechanism for supporting the damper on the frame.
  • the supporting mechanism maintains the damper in any existing rotation position while allowing the damper to rotate when a rotating force higher then a predetermined level is applied to the damper.
  • the supporting mechanism preferably comprises the connection between the damper and frame, this connection comprising a bush, bracket, bolt which passes through the bush and bracket, and a nut which generates friction between the bush and bracket when it is tightened on the bolt.
  • the clearance providing mechanism preferably comprises an eye, a bolt and a shock-absorbing member which absorbs the shock between the eye and bolt
  • the clearance is preferably set to be of the same order as or greater than the vibration amplitude in the high frequency vibration range of the vibrating body.
  • This invention also provides an anti-vibration mechanism for a vibrating body enclosed in a frame comprising a spring and a rotary damper, this rotary damper having connections with the vibrating body and frame. Further provided is a mechanism for providing a clearance within predetermined limits in one of the connections.
  • the clearance providing mechanism preferably comprises an eye, a bolt and a shock-absorbing member which absorbs the shock between the eye and bolt.
  • the clearance is preferably set to be of the same order as or greater than the vibration amplitude in the high frequency vibration range of the vibrating body
  • Fig. 1 is a schematic front view of an interior of a drum type washing machine according to this invention.
  • Fig. 2 is a schematic side view including a partial section of the interior of the drum type washing machine.
  • Fig. 3 is a vertical sectional view of connections between a damper and a drum, and between the damper and a frame, according to this invention.
  • Fig. 4 is a graph showing a relation between vibration transmission rate and wash tank rotation speed according to this invention.
  • Fig. 5 is a vertical sectional view of a connection between the damper and the drum according to another embodiment of this invention.
  • Fig. 6 is a schematic front view of an interior of a drum type washing machine according to yet another embodiment of this invention.
  • Fig. 7 is a vertical sectional view of connections between a damper and a drum and between the damper and a frame according to the embodiment shown in Fig. 6.
  • Fig. 8 is a schematic front view of an interior of a prior art washing machine.
  • a drum 3 which is a vibrating body is suspended by four springs 8 inside a wash frame 1.
  • a wash tank 2 driven by a motor 4 shown in Fig. 2 is housed inside the drum 3.
  • the motor 4 is installed outside the drum 3, and a pulley 5 attached to the rotation axis of the motor 4 rotates a pulley 7 attached to the rotation axis of the wash tank 2 via a belt 6.
  • the wash tank 2 is driven at different rotation speeds when washing is performed and when water is pumped out of the tank.
  • Brackets 11 project downwards from the drum 3, and two corresponding brackets 21 project upwards in the frame 1.
  • Rods 10 of dampers 9 are attached to the brackets 11, the bases of the dampers 9 being connected to the brackets 21.
  • FIG. 1 An eye 15 shown in Figs. 1 and 3 is fixed to the end of each of the rods 10, and a bolt 12 which passes through this eye 15 is fixed to the bracket 11 by a nut 13.
  • the rod 10 and bracket 11 are free to undergo any relative displacement up and down or to the left and right of Fig. 1 within the annular space formed between the eye 15 and collar 14.
  • the size of this annular space is set to be larger than the vibration amplitude of the drum 3 in the high frequency vibration region. This construction forms a connection between the damper 9 and the drum 3.
  • Another eye 16 is formed at the base of the damper 9, and a bush 17 comprising an elastic material such as rubber is fixed to the inside of the eye 16.
  • the bush 17 is gripped between washers 20, a bolt 18 passes through its center and a nut 19 screws onto the bolt 18 so as to fix the bush 17 to the bracket 21 with a predetermined force. Due to friction between the bush 17 and the washers 20, the bolt 18 and the eye 16 that are in contact with the bush 17, the damper 9 is kept at an upright position, while it can pivot about the bolt 18 when a load above a predetermined level is applied.
  • the tank 2 becomes an unbalanced rotating mass. This causes vibration to occur as the rotation speed of the wash tank 2 is increased from zero to pumping speed, thereby displacing the drum 3.
  • the rate at which vibration is transmitted from the drum 3 to the frame 1 is a maximum when the rotation speed of the tank 2 reaches a resonance point situated between the washing speed region and pumping speed region as shown in Fig. 4, and the displacement or vibration amplitude of the drum 3 is also a maximum at this speed.
  • the drum 3 tends to undergo a considerable displacement in the vicinity of the resonance point, and the bolt 12 of the bracket 11 comes into contact with the inner circumference of the eye 15 via the collar 14 so as to cause the rod 10 to elongate and contract.
  • the damper 9 generates a damping force which opposes the elongation and contraction of the rod 10, hence the vibration energy of the drum 3 is absorbed by the damper 9 and the displacement of the drum 3 is suppressed.
  • the drum 3 does undergo a displacement in regions other than that of the resonance point, for example in the washing region or pumping region shown in Fig. 4, this displacement is less than the gap between the inner circumference of the eye 15 and the outer circumference of the collar 14.
  • the collar 14 therefore moves freely inside the eye 15 according to the displacement of the drum 3, and the rod 10 is not made to contract.
  • the vibration transmission rate of the drum 3 is effectively identical to the case wherein it is supported only by the spring 8, so the rate is very much less than in the case where it is directly supported by the damper as shown by the single dotted line.
  • the damper 9 As the damper 9 is activated only at the resonance point and in its vicinity, the damper 9 does not transmit vibration in the high speed region as for example when water is being pumped out, hence the vibration transmission rate is very much suppressed both at the resonance point and during pumping. Moreover, as in the high frequency vibration region the damper 9 does not operate, the working time of the damper 9 is shorter than the operating time of the washing machine, and this also helps to maintain the lifetime and reliability of the damper 9.
  • the amount of clothes in the tank 2 varies, the amount of elongation of the spring 8 varies due to the change of supported weight, and the position of the drum 3 changes. For example, if the amount of clothes increases, the drum 3 moves downwards, and if this displacement exceeds the gap between the eye 15 and the collar 14, the eye 15 pushes the rod 10 down in contact with the collar 14. At the same time, the damper 9 turns against friction with the bush 17, and this restores the position of the damper 9 to a new pivot angle at which a balance is obtained. Therefore, even if the support position of the drum 3 changes the clearance between the eye 15 and the collar 14 does not change, and good vibration suppression is still maintained.
  • Fig. 5 shows another embodiment of this invention wherein the connection between the rod 10 and the bracket 11 differs.
  • a cushion 30 is installed on the inner circumference of the eye 15 instead of the collar 14 which fits over the outer circumference of the bolt 12. This cushion 30 has the same shock absorbing effect as that of the collar 14 when the eye 15 strikes the bolt 12.
  • the damper 9 was supported on the base of the frame 1, however it may also be supported at the side of the frame 1, and the number of dampers may moreover be varied as required.
  • the eye 15 may also be installed on the bracket 11, and the bolt 12 installed on the rod 10.
  • a rod or a tube may also be used instead of the bolt 12.
  • Figs. 6 and 7 show yet another embodiment of this invention, in which a rotary damper 40 is used instead of the linear type damper 9.
  • the rotary damper 40 comprises an arm 41, and a rod 10 is hinged at the tip of the arm 41.
  • the connection between the rod 10 and bracket 11 has the same construction as in the first embodiment.
  • the connection between the rotary damper 40 and bracket 21 has the same construction as the connection between the damper 9 and bracket 21 of the first embodiment.
  • the arm 41 is rotatable, it is also possible to fix the damper 40 to the frame 1.
  • a clearance was provided between the bracket 11 and the rod 10, however, a clearance may also be provided between the damper 9 or 40 and the bracket 21.
  • such a clearance may also be provided in the connection between the arm 41 and the rod 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Fluid-Damping Devices (AREA)
  • Vibration Prevention Devices (AREA)
EP94111978A 1993-02-01 1994-08-01 Antischwingungsmechanismus für Schwingungskörper Expired - Lifetime EP0695824B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP01494293A JP3234325B2 (ja) 1993-02-01 1993-02-01 防振用ダンパの取付構造
DE1994618460 DE69418460T2 (de) 1994-08-01 1994-08-01 Antischwingungsmechanismus für Schwingungskörper
EP94111978A EP0695824B1 (de) 1993-02-01 1994-08-01 Antischwingungsmechanismus für Schwingungskörper

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP01494293A JP3234325B2 (ja) 1993-02-01 1993-02-01 防振用ダンパの取付構造
EP94111978A EP0695824B1 (de) 1993-02-01 1994-08-01 Antischwingungsmechanismus für Schwingungskörper

Publications (2)

Publication Number Publication Date
EP0695824A1 true EP0695824A1 (de) 1996-02-07
EP0695824B1 EP0695824B1 (de) 1999-05-12

Family

ID=26135763

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94111978A Expired - Lifetime EP0695824B1 (de) 1993-02-01 1994-08-01 Antischwingungsmechanismus für Schwingungskörper

Country Status (2)

Country Link
EP (1) EP0695824B1 (de)
JP (1) JP3234325B2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2149640A1 (es) * 1996-03-21 2000-11-01 Balay Sa Dispositivo perfeccionado para sujecion de cubas de lavadoras.
EP1361306A1 (de) * 2002-05-06 2003-11-12 BSH Balay, S.A. Befestigungsvorrichtung für die Befestigung eines Stossdämpfers einer Waschmaschine
WO2005071156A1 (de) * 2004-01-27 2005-08-04 Suspa Holding Gmbh Anlenk-vorrichtung zur anlenkung eines reibungsdämpfers einer waschmaschine
ES2435102R1 (es) * 2012-05-23 2013-12-20 Bsh Electrodomesticos Espana Dispositivo amortiguador rotatorio para aparato electrodoméstico

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101133607B1 (ko) * 2004-02-25 2012-04-10 엘지전자 주식회사 드럼세탁기의 댐퍼 핀

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1408825A (fr) * 1964-07-01 1965-08-20 Hotchkiss Brandt Perfectionnement aux amortisseurs à friction pour machines à laver le linge à tambour
DE2043939A1 (de) * 1969-09-09 1971-03-11 Thomson Houston Comp Francaise Schwingungsdampfer
DE2201555A1 (de) * 1972-01-13 1973-07-19 Cordes Wilh Maschf Waschautomat
DE2815596A1 (de) * 1978-04-04 1979-10-25 Houdaille Lelaurain Sa Aufhaengung fuer waschmaschinenbehaelter
JPH0663291A (ja) * 1992-08-20 1994-03-08 Matsushita Electric Ind Co Ltd ドラム式洗濯機

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1408825A (fr) * 1964-07-01 1965-08-20 Hotchkiss Brandt Perfectionnement aux amortisseurs à friction pour machines à laver le linge à tambour
DE2043939A1 (de) * 1969-09-09 1971-03-11 Thomson Houston Comp Francaise Schwingungsdampfer
DE2201555A1 (de) * 1972-01-13 1973-07-19 Cordes Wilh Maschf Waschautomat
DE2815596A1 (de) * 1978-04-04 1979-10-25 Houdaille Lelaurain Sa Aufhaengung fuer waschmaschinenbehaelter
JPH0663291A (ja) * 1992-08-20 1994-03-08 Matsushita Electric Ind Co Ltd ドラム式洗濯機

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 18, no. 301 (C - 1210) 9 June 1994 (1994-06-09) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2149640A1 (es) * 1996-03-21 2000-11-01 Balay Sa Dispositivo perfeccionado para sujecion de cubas de lavadoras.
EP1361306A1 (de) * 2002-05-06 2003-11-12 BSH Balay, S.A. Befestigungsvorrichtung für die Befestigung eines Stossdämpfers einer Waschmaschine
ES2234353A1 (es) * 2002-05-06 2005-06-16 Bsh Balay S.A. Dispositivo de fijacion para la sujecion de un amortiguador de una maquina de lavar.
WO2005071156A1 (de) * 2004-01-27 2005-08-04 Suspa Holding Gmbh Anlenk-vorrichtung zur anlenkung eines reibungsdämpfers einer waschmaschine
ES2435102R1 (es) * 2012-05-23 2013-12-20 Bsh Electrodomesticos Espana Dispositivo amortiguador rotatorio para aparato electrodoméstico

Also Published As

Publication number Publication date
JP3234325B2 (ja) 2001-12-04
EP0695824B1 (de) 1999-05-12
JPH06225990A (ja) 1994-08-16

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