WO2012004819A1 - Amortisseur à friction différentielle, en particulier pour des machines de traitement du linge - Google Patents

Amortisseur à friction différentielle, en particulier pour des machines de traitement du linge Download PDF

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Publication number
WO2012004819A1
WO2012004819A1 PCT/IT2010/000307 IT2010000307W WO2012004819A1 WO 2012004819 A1 WO2012004819 A1 WO 2012004819A1 IT 2010000307 W IT2010000307 W IT 2010000307W WO 2012004819 A1 WO2012004819 A1 WO 2012004819A1
Authority
WO
WIPO (PCT)
Prior art keywords
stem
friction damper
truncated cone
friction
cylindrical body
Prior art date
Application number
PCT/IT2010/000307
Other languages
English (en)
Inventor
Giannino Sandrin
Original Assignee
Ro-Sa Plast S.P.A.
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
Application filed by Ro-Sa Plast S.P.A. filed Critical Ro-Sa Plast S.P.A.
Priority to PCT/IT2010/000307 priority Critical patent/WO2012004819A1/fr
Publication of WO2012004819A1 publication Critical patent/WO2012004819A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/08—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other
    • F16F7/09—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other in dampers of the cylinder-and-piston type
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/08—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other
    • F16F7/082—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other and characterised by damping force adjustment means

Definitions

  • the present invention refers to a friction damper, particularly for laundry treating machines, such as dryers, washing-drying machines and washing machines, suitable to dampen down the oscillations imposed on its components in different ways according to the intensity of the oscillations.
  • laundry treating machines generally include a frame containing a laundry treating unit comprising a tub and a drum, an electric motor, one or more ballast elements and a set of drive and control devices that regulate their operation.
  • the laundry treating unit In front-loading or top-loading machines having a horizontal axis of rotation of the drum, the laundry treating unit is usually suspended above the frame of the laundry treating machine through a pair of springs, and is anchored below the frame through a pair of dampers.
  • the dampers have the function of damping down the oscillations/vibrations to which the laundry treating unit is subject during the operation of the washing machine, both by the effect of rotation of the drum around its own axis and due to the unbalances caused by the uneven distribution of the load inside the drum.
  • the vibrations of the laundry treating unit are greater at the beginning and at the end of the spinning operations, when there is a greater variation in the rotation of the drum, while they are the least or nearly absent during the rotation at normal running conditions.
  • dampers which generally consist of a hollow cylindrical shell, closed at one end, and a stem, coaxial with the shell and sliding inside the cylindrical cavity.
  • the free ends of the stem and of the shell are provided with suitable eyelets to allow them to be anchored with respect to the frame and the drum; in i some cases it is also possible to have an inverse anchoring, that is, by rotating the damper by 180°.
  • Said friction dampers are provided with one or more friction elements interposed between the internal surface of the shell and the external surface of the stem.
  • said friction elements are fastened either on the surface of the shell or on the surface of the stem and are suitable to cooperate with the other surface to exert a sufficient friction force to damp down the oscillations of the drum.
  • the friction elements are annular bands made of spongy polymeric material, such as for example polyurethane foam.
  • dampers are generally capable of performing their function in a rather satisfactory manner; however, in some situations there may be drawbacks.
  • the shell-stem unit will tend to move as a single rigid body, thus losing its damping function and causing excessive stresses on the support springs, as well as impacts of the laundry treating unit against the frame and consequently a high noise level.
  • the main objective of the subject matter of the present invention is to overcome the drawbacks of the known art, in particular by providing a friction damper for laundry treating machines that is capable of intervening in a differentiated manner based on the intensity of vibrations transmitted to it by the laundry treating unit during the various treatment phases, such as spinning, rinsing and drying.
  • Another objective of the present invention is to produce an economic friction damper that is capable of operating in a simple and effective manner.
  • a further objective is to devise a washing machine damper that can be achieved with the usual well-known systems, machines and equipment.
  • FIG. 1 is a schematic view of a washing machine incorporating friction dampers according to the present invention
  • FIG. 3 is an enlarged detail of a damper according to the present invention.
  • a generic laundry treating machine including a box- shaped frame 1 , preferably metallic, housing a laundry treating unit 70 consisting of a tub 4 and a drum 3 whose aperture, located frontally on the frame 1 , is accessible from outside for loading and unloading the laundry.
  • the drum 3 rotates inside the tub 4 around a substantially horizontal axis thanks to an electric motor (not shown), that drives the drum 3 at a speed based on the program selected by the user through a group of drive and control devices activated through a control interface 2, such as for example a knob.
  • a control interface 2 such as for example a knob.
  • the laundry treating unit 70 is normally suspended from above in the box- shaped frame 1 of the washing machine from a pair of springs 5, and is connected to the basement 6 of the machine through a pair of dampers 7.
  • the scope of patent protection also extends to top-loading laundry treating machines, with a horizontal axis of rotation of the drum 3.
  • a friction damper 7 includes a hollow cylindrical body 8, closed at one end which is provided with an anchoring element 10, such as an eyelet, suitable to fasten the damper itself 7 to the unit 70 (or else to the base 6).
  • an anchoring element 10 such as an eyelet
  • the cavity provided by the hollow cylindrical body 8 is designed to slidingly receive a stem 9, having an end partially projecting outside the hollow cylindrical body 8 provided with an anchoring element 11 , for example an eyelet, to be fastened to the washing machine base 6 (or to the drum 3).
  • Both the stem 9 and the hollow cylindrical body 8 are generally made of suitably rigid polymeric material.
  • the internal walls of the hollow cylindrical body 8 may be lined with an appropriate layer of a material 80 having a high resistance to wear.
  • the stem 9 has a substantially cylindrical shape having an outside diameter smaller than the diameter of the hollow cylindrical body 8.
  • the stem 9 may have slightly the shape of a truncated cone, with the smaller diameter at the end provided with the eyelet 11 , thus allowing small lateral oscillations of the stem 9 with respect to the hollow cylindrical body 8.
  • the end of the stem 9 that is inserted into the hollow body 8 is provided with a plurality of axial slits defining a plurality of flexible, or elastically deformable, wings 50 that contribute to attenuating shocks in the case in which the damper 7 "bottoms out", that is, the stem 9 is completely inserted into the hollow cylindrical body 8.
  • the lateral surface of the stem 9 can be provided with a plurality of apertures 90, variably distributed, suitable to disperse the heat that is generated during the alternating movement of the stem 9 in the hollow cylindrical body 8.
  • Said stem 9, generally made in a single piece, is provided, at the end opposite the end with the anchoring eyelet 11 , with an annular seat 2, defined by two abutments 40.
  • an annular friction element 20 coaxially with the stem 9, is mounted an annular friction element 20, such as a band, preferably made of polymeric material, such as for example polyurethane foam.
  • Said friction element 20 has an external annular contact surface 28 suitable to slidingly cooperate with the lateral internal surface 18 of the hollow cylindrical body 8, and an internal annular contact surface 29 suitable to slidingly cooperate with the external surface of the stem 9 in the annular seat 12 delimited by the two abutments 40 projecting with respect to the body of the stem 9.
  • the surface of the seat 12 on which the friction element 20 slides includes two truncated cone portions 14, 15 forming two ramps centrally connected by a middle cylindrical portion 13. The inclination of the two truncated cone portions
  • the sliding friction force that is generated between the two elements placed in contact with each other depends essentially on the type of material composing them, on the roughness of the surfaces in reciprocal contact as the case may be, on the degree of force applied on said elements perpendicularly to the contact surfaces, and finally on the extent of said contact surfaces.
  • the materials forming the external surface of the seat 12 of the stem 9 and the lateral internal surface 18 of the hollow cylindrical body 8 or of the layer of lining 80, or their surface roughness may be different in order to vary the friction coefficients of the two surfaces, and consequently the principle that governs the relative motion of the two bodies whereinbetween the friction element 20 is interposed. In this manner, it is possible to calibrate the degree of damping with greater precision.
  • the friction element 20 is held in suspension substantially by friction between the cylindrical central portion 13 of the seat 12 and the internal lateral surface 18 of the hollow cylindrical body 8.
  • the vibration transmitted to the damper 7 is of low intensity.
  • the system may therefore be realized in such a manner that the small quantity of energy transmitted is not sufficient to overcome the static friction between the external contact annular surface 28 of the friction element and the internal lateral surface 18 of the hollow cylindrical body 8, but that it is instead sufficient to overcome the friction generated between the internal contact annular surface 29 of the friction element 20 and the surface of the seat 12.
  • the stem 9 oscillates substantially in an axial direction within the hollow cylindrical body 8, and the damping effect is given only by the rubbing of the internal surface 29 of the friction element 20, which thus remains integral with the hollow cylindrical body 8.
  • the vibrations transmitted to the damper 7 are very intense and therefore the damping effect must the greatest. Consequently, the system may be realized in such a way that the force transmitted to the damper 7 is sufficient to overcome the static friction on both contact surfaces 28, 29 of the friction element 20: the damping of the oscillation will therefore be greater because it is obtained thanks to the sliding of the friction element 20 both along the internal surface 18 of the hollow cylindrical body 8 and within the seat 12 of the stem 9.
  • the surface of the seat 12 may be suitably shaped so as to be particularly advantageous in the two different situations in which the stress on the damper is greatest.
  • the inclination of the conical surface of the seat 12 included between the abutments 40 in which the friction element 20 slides in that situation, that is the truncated cone portion 15 nearest the eyeiet 11 , is preferably greater; in fact, the more the friction element 20 moves sliding along the inclined surface of the truncated cone surface 15, the more it is compressed sideways against the internal surface 18 of the hollow element 8, thus enlarging accordingly the contact area with the bearing surface, resulting in an increased braking action.
  • a particularly advantageous geometry is one in which the upper truncated cone portion 14 has a lateral tapered surface with an inclination between 3° and 8°, preferably 7°, while the lower truncated cone portion 15 has a lateral tapered surface with an inclination included between 8° and 12°, preferably 10°.
  • a friction damper 7 achieves the purposes and advantages initially anticipated.
  • a friction damper 7 has been provided that makes it possible, without altering its overall dimensions, to generate a differential braking force so as to respond with precision to the most diverse operating conditions.
  • said friction damper 7 can be manufactured in a simple and economic manner with the usual well-known systems, machines and equipment, while guaranteeing a reliable and noiseless operation.
  • the damper 7 can be installed by rotating it 180°, that is, by connecting the stem 9 to the laundry treating unit 70 and the hollow cylindrical body 8 to the box-shaped frame 1.
  • damper described is preferably used in a washing machine, it is understood that it can be used for different applications as needed.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)

Abstract

La présente invention concerne un amortisseur à friction (7), en particulier pour des machines de blanchisserie, comprenant: un corps cylindrique creux (8), fermé à une extrémité, où il y a un premier élément d'ancrage (10); une tige (9) insérée de façon coulissante à l'intérieur dudit corps cylindrique creux (8) et comportant une extrémité dépassant en partie à l'extérieur du corps creux (8) et dotée d'un second élément d'ancrage (11); un élément de friction annulaire (20) monté axialement sur ladite tige (9) et comprenant une surface annulaire (28) de contact externe, convenant à une coopération coulissante avec la surface latérale interne (18) du corps cylindrique creux (8), et une surface annulaire (29) de contact interne, convenant à une coopération coulissante avec la surface externe de la tige (9) coïncidente avec un siège annulaire (12) formé sur une partie terminale de ladite tige (9) et délimité au-dessus et au-dessous par deux butées (40). Le siège annulaire (12) comprend une partie supérieure (14) tronconique et une partie inférieure (15) tronconique rattachées par une partie centrale (13) cylindrique.
PCT/IT2010/000307 2010-07-09 2010-07-09 Amortisseur à friction différentielle, en particulier pour des machines de traitement du linge WO2012004819A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT2010/000307 WO2012004819A1 (fr) 2010-07-09 2010-07-09 Amortisseur à friction différentielle, en particulier pour des machines de traitement du linge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2010/000307 WO2012004819A1 (fr) 2010-07-09 2010-07-09 Amortisseur à friction différentielle, en particulier pour des machines de traitement du linge

Publications (1)

Publication Number Publication Date
WO2012004819A1 true WO2012004819A1 (fr) 2012-01-12

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PCT/IT2010/000307 WO2012004819A1 (fr) 2010-07-09 2010-07-09 Amortisseur à friction différentielle, en particulier pour des machines de traitement du linge

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013109196A1 (de) * 2013-08-26 2015-02-26 Miele & Cie. Kg Reibungsdämpfer, insbesondere für eine Trommelwaschmaschine
DE102013109198A1 (de) * 2013-08-26 2015-02-26 Miele & Cie. Kg Reibungsdämpfer, insbesondere für Trommelwaschmaschinen

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR936113A (fr) * 1946-11-14 1948-07-09 Amortisseur à friction réglable dans l'huile, agissant dans les deux sens, notamment pour motocycles
DE2160573A1 (de) * 1971-12-07 1973-06-28 Graubremse Gmbh Vorrichtung zur daempfung von stoessen und schwingungen
EP0198179A1 (fr) * 1985-04-17 1986-10-22 Fritz Bauer + Söhne oHG Amortisseur à friction
EP0478983A2 (fr) * 1990-09-29 1992-04-08 SUSPA COMPART Aktiengesellschaft Amortisseur à frottement
DE4203449A1 (de) * 1992-02-07 1993-08-12 Schaeffler Waelzlager Kg Riemenspannvorrichtung
EP1754908A2 (fr) * 2005-08-16 2007-02-21 SUSPA Holding GmbH Amortisseur

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR936113A (fr) * 1946-11-14 1948-07-09 Amortisseur à friction réglable dans l'huile, agissant dans les deux sens, notamment pour motocycles
DE2160573A1 (de) * 1971-12-07 1973-06-28 Graubremse Gmbh Vorrichtung zur daempfung von stoessen und schwingungen
EP0198179A1 (fr) * 1985-04-17 1986-10-22 Fritz Bauer + Söhne oHG Amortisseur à friction
EP0478983A2 (fr) * 1990-09-29 1992-04-08 SUSPA COMPART Aktiengesellschaft Amortisseur à frottement
DE4203449A1 (de) * 1992-02-07 1993-08-12 Schaeffler Waelzlager Kg Riemenspannvorrichtung
EP1754908A2 (fr) * 2005-08-16 2007-02-21 SUSPA Holding GmbH Amortisseur

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013109196A1 (de) * 2013-08-26 2015-02-26 Miele & Cie. Kg Reibungsdämpfer, insbesondere für eine Trommelwaschmaschine
DE102013109198A1 (de) * 2013-08-26 2015-02-26 Miele & Cie. Kg Reibungsdämpfer, insbesondere für Trommelwaschmaschinen
DE102013109196B4 (de) 2013-08-26 2023-03-02 Miele & Cie. Kg Reibungsdämpfer, insbesondere für eine Trommelwaschmaschine

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