US20060011429A1 - Damper for damping vibration and washing machine having the same - Google Patents

Damper for damping vibration and washing machine having the same Download PDF

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Publication number
US20060011429A1
US20060011429A1 US11/179,517 US17951705A US2006011429A1 US 20060011429 A1 US20060011429 A1 US 20060011429A1 US 17951705 A US17951705 A US 17951705A US 2006011429 A1 US2006011429 A1 US 2006011429A1
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United States
Prior art keywords
damper
pressure
set forth
pressure member
shaft
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.)
Abandoned
Application number
US11/179,517
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English (en)
Inventor
Gwan Park
Seung Park
Jae Kim
Sung Kim
Si Jeon
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.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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 claimed from KR1020040054426A external-priority patent/KR100606829B1/ko
Priority claimed from KR1020040054423A external-priority patent/KR100577257B1/ko
Priority claimed from KR1020040054424A external-priority patent/KR100628152B1/ko
Priority claimed from KR1020040054425A external-priority patent/KR100577258B1/ko
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JEON, SI MOON, KIM, JAE HYUN, KIM, SUNG MIN, PARK, GWAN RYONG, PARK, SEUNG CHUL
Publication of US20060011429A1 publication Critical patent/US20060011429A1/en
Abandoned legal-status Critical Current

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    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a damper for damping vibration, and more particularly, to a damper, the damping force of which is adjustable, and a washing machine having the same.
  • a washing machine performs washing, rinsing, and dehydrating operations by filling the lower portion of the inside of a tub with water and detergent, placing laundry in a drum installed in the tub, and rotating the drum.
  • Such a washing machine is an apparatus for eliminating dirt from laundry using proper detergent and mechanical force.
  • the washing machine usually comprises a cabinet forming an external appearance, an outer tub provided in the cabinet for containing washing water, and an inner tub rotatably provided in the outer tub for containing laundry.
  • a washing machine in which a rotary shaft of the inner tub is approximately horizontal with the ground is referred to as a drum washing machine.
  • the drum washing machine is an apparatus for eliminating dirt from laundry by rotating a drum using the driving force of a motor under the condition that detergent, washing water and laundry are placed in the drum installed horizontally with the bottom of a cabinet.
  • the drum washing machine minimizes entanglement of the laundry and damage to the laundry, consumes a small quantity of the washing water, and has laundry-beating and rubbing effects.
  • the drum washing machine comprises the cabinet 10 forming an external appearance, a tub 20 provided in the cabinet 10 , and the drum 30 rotatably provided in the tub 20 .
  • an opening for placing the laundry in the cabinet 10 is formed through the front surface of the cabinet 10 , and a door 11 for opening and closing the opening is installed at the opening.
  • a rotating device 40 such as a motor, for rotating the drum 30 is installed in the rear of the tub 20 .
  • the tub 20 is horizontally installed in the cabinet 10 by suspension springs 50 for connecting the ceiling of the cabinet 10 and the upper part of the tub 20 , and a damper 60 for connecting the bottom of the cabinet 10 and the lower part of the tub 20 is installed on the lower part of the cabinet 10 .
  • the damper 60 is a unit for damping the vibration of the tub 20 generated due to the rotation of the drum 30 .
  • the damper 60 usually comprises a damper cylinder having a cylindrical shape, a shaft inserted into the damper cylinder and reciprocating, and a friction member fixed to the shaft.
  • the friction member reduces the vibration of the tub 20 by means of the friction with the damper cylinder.
  • the above drum washing machine sequentially or selectively performs washing, rinsing, and dehydrating operations, thereby washing the laundry.
  • the drum 30 is rotated at a high speed by the rotating device 40 , thus dehydrating the laundry.
  • the tub 20 is excessively vibrated (hereinafter, referred to as “excessively vibrated state”).
  • the shaft of the damper 60 reciprocates in the lengthwise direction of the damper cylinder in the damper cylinder by means of the vibration of the tub 20 , and the friction member reciprocates together with the reciprocation of the shaft and rubs against the inner wall of the damper cylinder.
  • the vibration of the tub 20 is damped by the frictional force between the friction member and the damper cylinder.
  • FIG. 2 is a graph illustrating the relation between the number of vibration of the tub and the spin speed of the drum according to variation of the damping force
  • FIG. 3 is a graph illustrating the relation between the TR force of the damper and the spin speed of the drum according to variation of the damping force.
  • the tub 20 to which a damper having a high damping force is applied and the tub 20 to which a damper having a low damping force are vibrated as illustrated in the graph of FIG. 2 .
  • the numbers of vibration of the tubs 20 are approximately the same after the excessively vibrated state, i.e., in the normally vibrated state, regardless of the damping forces of the dampers.
  • the TR force transmitted to a main body of the washing machine by the damper having the low damping force is maintained less than a designated degree.
  • the TR force is increased as time goes by, thereby continuously increasing the vibration and noise.
  • the damper having the high damping force is advantageous to damp the vibration and the noise.
  • the damper having the low damping force is advantageous.
  • the present invention is directed to a damper for damping vibration and a washing machine having the same substantially obviate one or more problems due to limitations and disadvantages of the related art.
  • An object of the present invention is to provide a damper having a structure for minimizing the transmission of vibration and a washing machine having the same.
  • a damper includes a damper cylinder; a shaft inserted into the damper cylinder through one end of the damper cylinder, and reciprocating in the lengthwise direction of the damper cylinder; and a friction member provided on the shaft for damping vibration by friction with the inner wall of the damper cylinder, and moving vertically to the lengthwise direction of the damper cylinder.
  • the shaft may include a frictional force-adjusting device for moving the friction member to adjust the frictional force between the friction member and the inner wall of the damper cylinder.
  • the frictional force-adjusting device may include a pressure unit for pressing the friction member to move the friction member towards the inner wall of the damper cylinder to a designated distance.
  • the pressure unit includes a first pressure member; a second pressure member provided at one side of the first pressure member, and positioned opposite to the first pressure member; and an interval adjuster for moving at least one of the first and second pressure members in the axial direction of the shaft in order to move the friction member.
  • first and second pressure members are disposed in the axial direction of the shaft, and at least one of the first and second pressure members includes at least one inclined portion inwardly inclined towards the other one of the first and second pressure members.
  • the side surface of at least one of the first and second members is inclined such that the cross sectional area thereof is decreased close to the other one of the first and second members.
  • the pressure unit may further include at least one slip member provided in the friction member to correspond to the inclined portion, and moving outwardly along the inclined portion to press the friction member when the first and second pressure members are close to each other.
  • the friction member moves towards the center of the shaft and is separated from the inner wall of the damper cylinder when the first and second pressure members are distant from each other.
  • the slip member may include an elastic member for returning the friction member to the center of the shaft when the first and second pressure members are distant from each other.
  • the elastic member has a ring-shape, and is provided on the outer cylindrical surface of the slip member.
  • the pressure unit may further include guide ribs provided on the outer cylindrical surface of at least one of the first and second pressure members for preventing the concentrated movement of the slip members in the circumferential direction.
  • the interval adjuster moves the second pressure member.
  • the interval adjuster includes at least one connection rod passing through the first pressure member fixed to a body of the shaft, and connected to the second pressure member; and a driving unit for driving the connection rod to move the second pressure member.
  • the driving unit rectilinearly may move the connection rod to move the second pressure member.
  • the driving unit includes an electromagnet provided at the other side of the first pressure member for rectilinearly moving the connection rod using magnetic force so that the second pressure member moves towards the first pressure member when current flows.
  • connection rod includes a metal member provided between the first pressure member and the electromagnet.
  • the driving unit includes a wire connected to the connection rod; and an actuator connected to the wire.
  • the driving unit includes a motor for rotating the connection rod, and the second pressure member rectilinearly moves by the rotation of the connection rod.
  • connection rod passes through the second pressure member, and is connected to the second pressure member by screws.
  • the pressure unit may further include a guide pin, one end of which is inserted into the first pressure member and the other end of which is inserted into the second pressure member, for guiding the movement of the second pressure member.
  • the interval adjuster may include an electromagnet provided on the first pressure member; a metal member provided on the second pressure member; and a guide rod passing through the second pressure member for guiding the movement of the second pressure member.
  • the guide rod may include a stopper, one end of which is connected to one side of the electromagnet and the other end of which prevents the second pressure member from being separated from the guide rod.
  • the friction member may have a ring shape surrounding the outer cylindrical surface of the shaft.
  • the friction member may be made of an elastic material.
  • the friction member contacts the inner wall of the damper cylinder when the number of vibration of an object to be vibrated is more than a designated value, and is separated from the inner wall of the damper cylinder when the number of vibration of the object is less than the designated value.
  • the frictional force between the friction member and the inner wall of the damper cylinder when the spin speed of an object for generating vibration is more than a designated speed is lower than that when the spin speed of the object is less than the designated speed.
  • One of the damper cylinder and the shaft is connected to a tub of a washing machine, and the other one of the damper cylinder and the shaft is connected to a cabinet of the washing machine.
  • FIG. 1 is a schematic sectional view of a conventional drum washing machine
  • FIG. 2 is a graph illustrating the relation between the number of vibration of a tub and the spin speed of a drum according to variation of damping force
  • FIG. 3 is a graph illustrating the relation between the TR force of a damper and the spin speed of the drum according to variation of damping force
  • FIG. 4 is a sectional view of a damper in accordance with a first embodiment of the present invention.
  • FIGS. 5A and 5B are a partial and longitudinal sectional view and a transversal sectional view illustrating a friction member of the damper shown in FIG. 4 , which is separated from the inner wall of a damper cylinder;
  • FIGS. 6A and 6B are a partial and longitudinal sectional view and a transversal sectional view illustrating the friction member of the damper shown in FIG. 4 , which contacts the inner wall of the damper cylinder;
  • FIG. 7 is a sectional view of one embodiment of a pressure unit of the damper of the present invention.
  • FIG. 8 is a perspective view of another embodiment of the pressure unit of the damper of the present invention.
  • FIGS. 9A and 9B are sectional views of a damper in accordance with a second embodiment of the present invention.
  • FIGS. 10A and 10B are sectional views of a damper in accordance with a third embodiment of the present invention.
  • FIGS. 11A and 11B are sectional views of a damper in accordance with a fourth embodiment of the present invention.
  • FIG. 4 is a sectional view of the damper in accordance with the first embodiment of the present invention.
  • FIGS. 5A and 5B are a partial and longitudinal sectional view and a transversal sectional view illustrating a friction member of the damper shown in FIG. 4 , which is separated from the inner wall of a damper cylinder.
  • FIGS. 6A and 6B are a partial and longitudinal sectional view and a transversal sectional view illustrating the friction member of the damper shown in FIG. 4 , which contacts the inner wall of the damper cylinder.
  • FIG. 7 is a sectional view of another embodiment of a pressure unit of the damper of the present invention.
  • FIG. 8 is a perspective view of yet another embodiment of the pressure unit of the damper of the present invention.
  • the damper of the present invention may be applied to general washing machines or apparatuses generating vibration as well as the above drum washing machine.
  • a detailed description of known functions and configurations of a washing machine, to which the damper of the present invention is applied, will be omitted, and the same or similar elements of the washing machine are denoted by the same reference numerals as those of the conventional washing machine using a damper.
  • the damper 600 in accordance with the first embodiment of the present invention comprises a damper cylinder 610 , a shaft 620 inserted into the damper cylinder 610 , and a friction member 630 provided on the shaft 620 .
  • the damper cylinder 610 has a hollow cylindrical structure. One end of the shaft 620 is inserted into an opened end of the damper cylinder 610 , and the shaft 620 reciprocates in the lengthwise direction of the damper cylinder 610 when the tub 20 is vibrated.
  • the other end of the damper cylinder 610 is connected to the lower part of the tub 20
  • the other end of the shaft 620 is connected to the bottom of the cabinet 10 to absorb the vibration generated from the tub 20 .
  • the other end of the damper cylinder 610 may be connected to the bottom of the cabinet 10 , and the other end of the shaft 620 may be connected to the lower part of the tub 20 .
  • the damper 600 provided with an upper portion 610 a connected to the lower part of the tub 20 and a lower portion 610 b connected to the bottom of the cabinet 10 will be described.
  • the friction member 630 is movable vertically to the lengthwise direction of the damper cylinder 610 , and damps the vibration of the tub 20 by the friction with the inner wall of the damper cylinder 610 .
  • the shaft 620 includes a frictional force-adjusting device for adjusting the frictional force between the friction member 630 and the inner wall of the damper cylinder 610 by moving the friction member 630 .
  • the frictional force-adjusting device of the damper 600 of the first embodiment includes a pressure unit 640 for pressing the friction member 630 towards the inner wall of the damper cylinder 610 to move the friction member 630 by a designated distance towards the inner wall of the damper cylinder 610 .
  • the pressure unit 640 includes a first pressure member 641 , a second pressure member 642 provided at one side of the first pressure member 641 , and an interval adjuster for adjusting the interval between the first pressure member 641 and the second pressure member 642 .
  • the first pressure member 641 is provided on one end of the shaft 620 , i.e., the upper end of the shaft 620 , and the second pressure member 642 is provided above the first pressure member 641 such that the second pressure member 642 is positioned opposite to the first pressure member 641 .
  • first pressure member 641 and the second pressure member 642 are disposed in the axial direction of the shaft 620 , i.e., the longitudinal direction.
  • the interval adjuster moves at least one of the first pressure member 641 and the second pressure member 642 in the axial direction of the shaft 620 to adjust the interval between the first pressure member 641 and the second pressure member 642 , thereby causing the friction member 630 to contact the inner wall of the damper cylinder 610 with designated force.
  • the first pressure member 641 is fixed to a body of the shaft 620
  • the second pressure member 642 is installed on the body of the shaft 620 such that the second pressure member 642 moves vertically.
  • the second pressure member 642 may be fixed to the body of the shaft 620 , and the first pressure member 641 may be installed on the body of the shaft 620 such that the first pressure member 641 moves vertically.
  • this embodiment illustrates the first pressure member 641 and the second member 642 , which are provided on the upper end of the body of the shaft 620 , the positions of the first pressure member 641 and the second member 642 are not limited thereto.
  • At least one of the first pressure member 641 and the second pressure member 642 includes at least one inclined portion inwardly inclined towards the other one of the first pressure member 641 and the second pressure member 642 .
  • a plurality of inclined portions which are inwardly inclined from the lower part of the first pressure member 641 to the upper part of the first pressure member 641 , may be formed on the side surface of the first pressure member 641 such that the inclined portions are spaced by the same interval in the circumferential direction.
  • a plurality of inclined portions having symmetrical shapes to those of the inclined portions of the first pressure member 641 may be formed on the side surface of the second pressure member 642 .
  • the first pressure member 641 has a shape such that the cross sectional area of the first pressure member 641 is decreased from the lower portion of thereof to the upper portion thereof on which the second pressure member 642 is provided, and has a side surface inwardly inclined from the lower portion thereof to the upper portion thereof.
  • the second pressure member 642 is symmetrical with the first pressure member 641 . Accordingly, inclined portions 641 a and 642 a are respectively formed on the side surfaces of the first and second pressure members 641 and 642 .
  • first pressure member 641 and the second pressure member 642 may have the above shape.
  • FIG. 7 illustrates one embodiment of the pressure unit including first and second pressure members 741 and 742 having inclined portions 741 a and 742 a , the vertical cross sections of which have concave shapes.
  • At least one slip member 643 for moving the friction member 630 outwardly so that the inclined portion 641 a of the first pressure member 641 corresponds to the inclined portion 642 a of the second pressure member 642 is provided in the friction member 630 .
  • Each of the slip members 643 includes upper inclined planes corresponding to the inclined portions 642 a of the second pressure member 642 and lower inclined planes corresponding to the inclined portions 641 a of the first pressure member 641 .
  • the lower and upper inclined planes of the slip members 643 slip along the inclined portions 641 a of the first pressure member 641 and the inclined portions 642 a of the second pressure member 642 .
  • the slip members 643 outwardly move towards the inner wall of the damper cylinder 610 , and press the inner surface of the friction member 630 , thereby causing the friction member 630 to contact the inner wall of the damper cylinder 610 with designated force.
  • the inclined portions 641 a of the first pressure member 641 , the inclined portions 642 a of the second pressure member 642 , and the upper and lower inclined planes of the slip members 643 are made of a material having a smoother surface than the friction member 630 and the inner wall of the damper cylinder 610 .
  • the friction member 630 moves towards the center of the shaft 620 . Thereby, the frictional force between the friction member 630 and the inner wall of the damper cylinder 610 is gradually decreased, and thus the damping force of the damper 600 is reduced.
  • At least one slip member 643 includes an elastic member 643 a for returning the friction member 630 towards the center of the shaft 620 when the first pressure member 641 and the second pressure member 642 are distant from each other.
  • the elastic member 643 a may be a metal spring having a ring shape or a rubber band provided on the outer cylindrical surface of the slip member 643 .
  • a groove 643 b is formed in the outer cylindrical surface of the slip member 643 in the circumferential direction, and the ring-shaped elastic member 643 a is inserted into the groove 643 b.
  • guide ribs 641 b for preventing the concentrated movement of the slip members 643 in the circumferential direction are formed in the outer cylindrical surface of at least one of the first pressure member 641 and the second pressure member 642 .
  • the guide ribs 641 b are separated from each other in the circumferential direction by the same interval. Thereby, it is possible to maintain the proper interval between the slip members 643 .
  • the friction members 630 pressed and moved by the slip members 643 may be prepared in the same number as that of the slip members 643 , or may be one ring-shaped elastic member surrounding the outer cylindrical surface of at least one slip member 643 as described in this embodiment.
  • the interval adjuster of the damper of the first embodiment moves the second pressure member 642 towards the first pressure member 641 .
  • the interval adjuster includes connection rods 644 passing through the first pressure member 641 and vertically moving, and a driving unit for driving the connection rods 644 .
  • connection rods 644 are connected to the second pressure member 642 , and vertically move along guide holes 641 c formed through the first pressure member 641 .
  • connection rods 644 rectilinearly move downwardly or upwardly, the second pressure member 642 moves downwardly or upwardly.
  • the friction member 630 is pressed by the slip members 643 , and moves towards the inner wall of the damper cylinder 610 or in the opposite direction. Thereby, the frictional force between the friction member 630 and inner wall of the damper cylinder 610 is adjusted.
  • the driving unit of the interval adjuster moves the connection rods 644 by magnetic force.
  • the driving unit includes an electromagnet 645 provided below the first pressure member 641 .
  • the electromagnet 645 rectilinearly moves the connection rods 644 downwardly using magnetic force so that the second pressure member 642 moves towards the first pressure member 641 when current flows.
  • the electromagnet 645 includes a core 645 a installed on the upper part of the shaft 620 , a bobbin 645 b installed outside the core 645 a , and a coil (not shown) wound on the bobbin 645 b several times.
  • the connection rods 644 are attracted downwardly by the magnetic force of the electromagnet 645 .
  • each of the connection rods 644 includes a metal member 644 a formed at the lower end thereof between the first pressure member 641 and the electromagnet 645 .
  • the first pressure member 641 is fixed to the core 645 a . More specifically, the first pressure member 641 includes a fixing rod 641 d , which passes through the metal members 644 a of the connection rods 644 and is provided with the lower end connected to the core 645 a.
  • the friction member 630 selectively contacts the inner wall of the damper cylinder 610 by the above-described frictional force-adjusting device.
  • the friction member 630 contacts the inner wall of the damper cylinder 610 so as to increase the damping force of the damper 600 . Then, when the tub 20 reaches the normally vibrated state, the friction member 630 is separated from the inner wall of the damper cylinder 610 so as to decrease the damping force of the damper 600 .
  • the rotating device 40 rotates the drum 30 , and laundry is washed by the rotation of the drum 30 .
  • the tub 20 is vibrated by the rotation of the rotating device 40 and the drum 30 .
  • the vibration of the tub 20 is damped by the damper 600 , and the transmission of the vibration of the tub 20 to the cabinet 10 is minimized.
  • the tub 20 is excessively vibrated in the initial stage of the dehydrating operation.
  • the second pressure member 642 connected to the upper ends of the connection rods 644 move downwardly, and force is applied to the slip members 643 by the first pressure member 641 and the second pressure member 642 so that the slip members 643 move towards the inner wall of the damper cylinder 610 .
  • the friction member 630 is pressed by the slip members 643 , and contacts the inner wall of the damper cylinder 610 , and the vibration of the tub 20 is damped by the frictional force between the friction member 630 and the inner wall of the damper cylinder 610 .
  • the tub 20 reaches a normally vibrated state.
  • the force for pressing the friction member 630 provided outside the slip members 643 is eliminated, and the slip members 643 are returned to the original positions towards the center of the shaft 620 by the elastic members 643 a provided on the outer cylindrical surfaces of the slip members 643 . Further, the friction member 630 elastically contracts, and moves to its original position, i.e., towards the center of the shaft 620 .
  • the friction member 630 is separated from the inner wall of the damper cylinder 610 , a designated distance (t) is formed between the friction member 630 and the inner wall of the damper cylinder 610 , and the TR force of the tub 20 to a structure of the washing machine, particularly, the cabinet 10 , through the damper 600 is decreased. Thereby, the dehydrating operation is quietly and smoothly performed.
  • a vibration sensing device for sensing the vibration of the tub 20 and a control unit (not shown) for controlling the damper 600 according to the vibrated state of the tub 20 are installed at designated positions of the washing machine.
  • the control unit controls current supplied to the electromagnet 645 , thereby adjusting the damping force of the damper 600 .
  • an alternate method for adjusting the damping force of the damper 600 may be employed.
  • a time taken to reach the normally vibrated state of the tub 20 is input in advance to the control unit. Before the tub 20 reaches the normally vibrated state, current is supplied to the electromagnet 645 so as to increase the damping force of the damper 600 , and after the tub 20 reaches the normally vibrated state, current is not supplied to the electromagnet 645 so as to decrease the damping force of the damper 600 .
  • dampers in these embodiments which are substantially the same as those of the damper in the first embodiment, are denoted by the same reference numerals even through they are depicted in different drawings, and a detailed description thereof will thus be omitted because it is considered to be unnecessary.
  • the damper 600 a comprises a connection rod 744 passing through the first pressure member 641 and the second pressure member 642 and vertically moving.
  • vertical guide holes are respectively formed through central portions of the first and second pressure members 641 and 642 .
  • the diameter of the guide holes formed through the first and second pressure members 641 and 642 is larger than that of the connection rod 744 .
  • connection rod 744 The lower end of the connection rod 744 is connected to an actuator (not shown), and is connected to a wire 745 for drawing the connection rod 744 downwardly.
  • a head 744 a having a diameter larger than that of the guide hole of the second pressure member 642 is formed on the upper end of the connection rod 744 .
  • the slip members 643 are pressed by the first pressure member 641 and the second pressure member 642 , slid outwardly along the inclined portions 641 a and 642 a of the first and second pressure members 641 and 642 , and press the friction member 630 towards the inner wall of the damper cylinder 610 .
  • connection rod 744 may be fixed to the second pressure member 642 . In this case, the connection rod 744 does not include the head 744 a.
  • damper 600 a Other configurations and operating method of the damper 600 a are substantially the same as those of the damper of the first embodiment, and a detailed description thereof will thus be omitted because it is considered to be unnecessary.
  • the damper 600 b comprises a connection rod 844 passing through the first pressure member 641 and connected to the second pressure member 642 in order to vertically move the second pressure member 642 .
  • connection rod 844 vertically passes through the second pressure member 642 .
  • vertical guide holes are respectively formed through central portions of the first and second pressure members 641 and 642 .
  • a female screw thread is formed in the guide hole of the second pressure member 642
  • a male screw thread corresponding to the female screw thread is formed on the outer cylindrical surface of the connection rod 844 .
  • the female screw thread of the guide hole of the second pressure member 642 is engaged with the male screw thread of the outer cylindrical surface of the connection rod 844 .
  • connection rod 844 is rotated by a rotating device, such as a motor 845 .
  • this embodiment illustrates the motor 845 provided below the first pressure member 641
  • the position of the motor 845 is not limited thereto.
  • the motor 845 may be fixed to the inside of the first pressure member 641 .
  • connection rod 844 is directly connected to a rotary shaft (not shown) of the motor 845
  • the connection method of the connection rod 844 is not limited thereto.
  • the connection rod 844 may be connected to the rotary shaft of the motor 845 by a belt.
  • the diameter of the guide hole formed through the first pressure member 641 is larger than that of the connection rod 744 .
  • the first pressure member 641 and the second pressure member 642 are connected by a guide pin 846 , one end of which is inserted into the first pressure member 641 and the other end of which is inserted into the second pressure member 642 .
  • the diameter of at least one of the first and second grooves is larger than that of the guide pin 846 .
  • the guide pin 846 guides the vertical movement of the second pressure member 642 , and simultaneously prevents the second pressure member 642 from being rotated together with the rotation of the connection rod 844 .
  • connection rod 844 rotates in one direction
  • the second pressure member 642 is not rotated by the guide pin 846 , but moves upwardly or downwardly, i.e., rectilinearly moves in the longitudinal direction of the damper cylinder 610 .
  • the frictional force between the friction member 630 and the inner wall of the damper cylinder 610 is adjusted by the vertical movement of the second pressure member 642 .
  • damper 600 b Other configurations and operating method of the damper 600 b are substantially the same as those of the damper of the first embodiment, and a detailed description thereof will thus be omitted because it is considered to be unnecessary.
  • the second pressure member 642 of the damper 600 c moves by the magnetic force of an electromagnet 945 , similarly to the damper 600 of the first embodiment.
  • the damper 600 c includes the electromagnet 945 provided on the first pressure member 641 , and a first metal member 946 provided on the second pressure member 642 .
  • the electromagnet 945 passes through the first pressure member 641 so that the surface of the upper end of the electromagnet 945 coincides with the surface of the upper end of the first pressure member 641 .
  • the electromagnet 945 includes a core 945 a installed on a body of the shaft 620 , a bobbin 945 b installed outside the core 945 a , and a coil (not shown) wound on the bobbin 945 b several times.
  • the core 945 a of the damper 600 c of this embodiment is fixed to the upper end of the body of the shaft 620 , the position of the core 945 a is not limited thereto.
  • the electromagnet 945 further includes a second metal member 945 c surrounding the outer cylindrical surface of the bobbin 945 b provided with the coil wound thereon.
  • the second metal member 945 c uniformly distributes the magnetic force generated when current flows along the coil, and improves the magnetic force of the electromagnet 945 .
  • the first metal member 946 serves to move the second pressure member 642 towards the first pressure member 641 when current flows along the electromagnet 945 .
  • the first metal member 946 is fixed to the second pressure member 642 . More preferably, the first metal member 946 is fixed to the lower part of the second pressure member 642 .
  • a guide rod 944 which passes through the second pressure member 642 so that one end of the guide rod 944 is connected to one end of the electromagnet 945 , is provided.
  • the guide rod 944 vertically passes through the central portion of the second pressure member 642 so that the lower end of the guide rod 944 is fixed to the core 945 a of the electromagnet 945 .
  • a guide hole through which the guide rod 944 passes, is formed through the second pressure member 642 .
  • the guide hole has a larger diameter than that of the guide rod 944 .
  • a stopper 944 a for preventing the separation from the second pressure member 642 is formed on the guide rod 944 .
  • the stopper 944 a is provided on the other end of the guide rod 944 , i.e., the upper end of the guide rod 944 , and has a larger diameter than that of the guide hole.
  • the second pressure member 642 when the supply of current to the electromagnet 945 is cut off, the second pressure member 642 is distant from the first pressure member 641 by force applied to the friction member 630 , and a designated distance between the second pressure member 642 and the first pressure member 641 is maintained by the stopper 944 a . That is, the second pressure member 642 moves upwardly to a designated distance, and is then stopped by the stopper 944 a.
  • damper 600 c Other configurations and operating method of the damper 600 c are substantially the same as those of the damper of the first embodiment, and a detailed description thereof will thus be omitted because it is considered to be unnecessary.
  • the friction member may contact the inner wall of the damper cylinder by a small force in the normally vibrated state of the object rather than in the excessively vibrated state of the object.
  • the damper of the present invention adjusts the damping force thereof according to the vibration degree of an object to be vibrated and/or the number of rotation of the object, thereby improving a vibration-damping effect and a noise-preventing effect.
  • the damper of the present invention decreases the transmission of the vibration of the object, thereby preventing peripheral components from being damaged.
  • the damper of the present invention has the simple configuration of a pressure unit for pressing a friction member, thereby being easily manufactured.
  • the damper of the present invention does not require a power device for reducing the damping force of the damper, thereby reducing production costs.
  • the damper of the present invention reduces or eliminates frictional force between a damper cylinder and the friction member in the normally vibrated state of a tub, thereby lengthening the life span of the friction member.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Vibration Prevention Devices (AREA)
  • Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)
US11/179,517 2004-07-13 2005-07-13 Damper for damping vibration and washing machine having the same Abandoned US20060011429A1 (en)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
KR1020040054426A KR100606829B1 (ko) 2004-07-13 2004-07-13 댐퍼, 이를 이용하는 세탁기 및 세탁기의 제어방법
KRP2004-54424 2004-07-13
KR1020040054423A KR100577257B1 (ko) 2004-07-13 2004-07-13 세탁기의 댐퍼 및 그 제어방법
KR1020040054424A KR100628152B1 (ko) 2004-07-13 2004-07-13 세탁기의 댐퍼 및 그 제어방법
KRP2004-54425 2004-07-13
KRP2004-54426 2004-07-13
KR1020040054425A KR100577258B1 (ko) 2004-07-13 2004-07-13 세탁기의 댐퍼 및 그 제어방법
KRP2004-54423 2004-07-13

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US (1) US20060011429A1 (de)
JP (1) JP2006029585A (de)
DE (1) DE102005032499B4 (de)

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US20080066238A1 (en) * 2006-09-19 2008-03-20 Lg Electronics Inc. Apparatus and method for sensing vibration of washing machine
US20080199460A1 (en) * 2005-09-01 2008-08-21 Schering Corporation Use of IL-23 and IL-17 antagonists to treat autoimmune ocular inflammatory disease
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US20090071200A1 (en) * 2002-12-27 2009-03-19 Jae-Won Chang Drum type washing machine
EP2090687A1 (de) * 2008-02-15 2009-08-19 C.I.M.A. Compagnia Italiana Molle Acciaio S.p.A. Reibungsdämpfer für Leinenwaschmaschinen
US20100018261A1 (en) * 2002-12-27 2010-01-28 Jae Won Chang Drum type washing machine
US7827834B2 (en) 2005-09-30 2010-11-09 Lg Electronics Inc. Bearing housing assembly of drum-type washing machine and drum-type washing machine with the same
USRE43625E1 (en) 2006-03-29 2012-09-04 Lg Electronics Inc. Drum type washing machine
US20130118210A1 (en) * 2011-11-11 2013-05-16 Samsung Electronics Co., Ltd. Washing machine having vibration reducing apparatus and vibration reducing method using the same
EP2692931A1 (de) * 2012-07-30 2014-02-05 LG Electronics Inc. Wäschebehandlungsmaschine
US20140109628A1 (en) * 2011-03-28 2014-04-24 Dongbu Daewoo Electronics Corporation Drum washing machine
EP2807043A4 (de) * 2012-01-23 2015-11-11 Cooper Standard Automotive Inc Elektrisch schaltbare verriegelungsschubstange
US20150354653A1 (en) * 2013-01-21 2015-12-10 Aksistem Elektromekanik Sanayi ve Ticaret Ltd. Sti Electromechanical shock absorber for washing machines
CN107345548A (zh) * 2016-05-04 2017-11-14 苏斯帕有限公司 可切换阻尼器
EP2568070A4 (de) * 2010-05-06 2018-01-10 Toshiba Lifestyle Products & Services Corporation Waschmaschine
US20180163808A1 (en) * 2016-12-14 2018-06-14 Suspa Gmbh Friction device and friction damper comprising a friction device of this type
EP3869062A1 (de) * 2020-02-24 2021-08-25 SUSPA GmbH Reibungsdämpfer
US11320022B1 (en) 2020-11-20 2022-05-03 Hamilton Sundstrand Corporation Friction tubes
IT202100005237A1 (it) * 2021-03-05 2022-09-05 Milano Politecnico Dispositivo smorzatore di vibrazioni
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US8336339B2 (en) 2002-12-27 2012-12-25 Lg Electronics Inc. Drum type washing machine
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US8616027B2 (en) 2002-12-27 2013-12-31 Lg Electronics Inc. Drum type washing machine
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US20100089101A1 (en) * 2002-12-27 2010-04-15 Jae-Won Chang Drum type washing machine
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US8671719B2 (en) 2002-12-27 2014-03-18 Lg Electronics Inc. Drum type washing machine
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US8800326B2 (en) 2004-07-20 2014-08-12 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
US8677787B2 (en) 2004-07-20 2014-03-25 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
US8931312B2 (en) 2004-07-20 2015-01-13 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
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US8434334B2 (en) 2004-07-20 2013-05-07 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
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US20080307833A1 (en) * 2004-07-20 2008-12-18 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
US20100242550A1 (en) * 2004-07-20 2010-09-30 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
US8783072B2 (en) 2004-07-20 2014-07-22 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
US7568366B2 (en) 2004-07-20 2009-08-04 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
US20080199460A1 (en) * 2005-09-01 2008-08-21 Schering Corporation Use of IL-23 and IL-17 antagonists to treat autoimmune ocular inflammatory disease
US20090044574A1 (en) * 2005-09-30 2009-02-19 Lg Electronics Inc. Drum-type washing machine
US7827834B2 (en) 2005-09-30 2010-11-09 Lg Electronics Inc. Bearing housing assembly of drum-type washing machine and drum-type washing machine with the same
US8234890B2 (en) 2005-09-30 2012-08-07 Lg Electronics Inc. Drum-type washing machine
US8225628B2 (en) 2005-09-30 2012-07-24 Lg Electronics Inc. Drum-type washing machine
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US20110041566A1 (en) * 2005-09-30 2011-02-24 Lg Electronics Inc. Drum-type washing machine
US8671718B2 (en) 2005-09-30 2014-03-18 Lg Electronics Inc. Drum-type washing machine
USRE43625E1 (en) 2006-03-29 2012-09-04 Lg Electronics Inc. Drum type washing machine
USRE44674E1 (en) 2006-03-29 2013-12-31 Lg Electronics Inc. Drum type washing machine
USRE44511E1 (en) 2006-03-29 2013-10-01 Lg Electronics Inc. Drum type washing machine
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USRE44795E1 (en) 2006-03-29 2014-03-11 Lg Electronics Inc. Drum type washing machine
US20080066238A1 (en) * 2006-09-19 2008-03-20 Lg Electronics Inc. Apparatus and method for sensing vibration of washing machine
US7963128B2 (en) 2006-09-19 2011-06-21 Lg Electronics Inc. Apparatus and method for sensing vibration of washing machine
US20110200417A1 (en) * 2007-05-29 2011-08-18 Yeongjin Yeo Apparatus for transferring substrates
US8297196B2 (en) * 2007-05-29 2012-10-30 Lg Display Co., Ltd. Apparatus for transferring substrates
US7954434B2 (en) * 2007-05-29 2011-06-07 Lg Display Co., Ltd. Apparatus for transferring substrates
US20080298947A1 (en) * 2007-05-29 2008-12-04 Lg Display Co., Ltd. Apparatus for transferring substrates
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EP2568070A4 (de) * 2010-05-06 2018-01-10 Toshiba Lifestyle Products & Services Corporation Waschmaschine
US20140109628A1 (en) * 2011-03-28 2014-04-24 Dongbu Daewoo Electronics Corporation Drum washing machine
US20130118210A1 (en) * 2011-11-11 2013-05-16 Samsung Electronics Co., Ltd. Washing machine having vibration reducing apparatus and vibration reducing method using the same
EP2594675A1 (de) * 2011-11-11 2013-05-22 Samsung Electronics Co., Ltd Waschmaschine mit vibrationsmindernder Vorrichtung und vibrationsminderndes Verfahren damit
EP2807043A4 (de) * 2012-01-23 2015-11-11 Cooper Standard Automotive Inc Elektrisch schaltbare verriegelungsschubstange
US9545832B2 (en) 2012-01-23 2017-01-17 Cooper-Standard Automotive Inc. Electrically switchable locking torque strut
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EP3553218A1 (de) * 2012-07-30 2019-10-16 LG Electronics Inc. Wäschebehandlungsmaschine
EP2692931A1 (de) * 2012-07-30 2014-02-05 LG Electronics Inc. Wäschebehandlungsmaschine
US20150354653A1 (en) * 2013-01-21 2015-12-10 Aksistem Elektromekanik Sanayi ve Ticaret Ltd. Sti Electromechanical shock absorber for washing machines
US9752638B2 (en) * 2013-01-21 2017-09-05 Aksistem Elektromekanik Sanayi Ve Ticaret Ltd. Sti. Electromechanical shock absorber for washing machines
EP3246592A1 (de) * 2016-05-04 2017-11-22 SUSPA GmbH Schaltbarer dämpfer
CN107345548A (zh) * 2016-05-04 2017-11-14 苏斯帕有限公司 可切换阻尼器
US10598244B2 (en) 2016-05-04 2020-03-24 Suspa Gmbh Switchable damper
RU2735485C2 (ru) * 2016-05-04 2020-11-03 СУСПА ГмбХ Переключаемый амортизатор
RU2735485C9 (ru) * 2016-05-04 2021-01-26 СУСПА ГмбХ Переключаемый амортизатор
KR102420216B1 (ko) * 2016-12-14 2022-07-12 수스파 게엠베하 마찰 디바이스 및 이러한 유형의 마찰 디바이스를 포함하는 마찰 감쇠기
KR20180068887A (ko) * 2016-12-14 2018-06-22 수스파 게엠베하 마찰 디바이스 및 이러한 유형의 마찰 디바이스를 포함하는 마찰 감쇠기
CN108223663A (zh) * 2016-12-14 2018-06-29 苏斯帕有限公司 摩擦装置及具有该类型摩擦装置的摩擦阻尼器
US20180163808A1 (en) * 2016-12-14 2018-06-14 Suspa Gmbh Friction device and friction damper comprising a friction device of this type
EP3336375A1 (de) * 2016-12-14 2018-06-20 SUSPA GmbH Reibungsvorrichtung und reibungsdämpfer mit einer derartigen reibungsvorrichtung
US11578450B2 (en) 2019-06-05 2023-02-14 Samsung Electronics Co., Ltd. Damper and washing machine having the same
EP3869062A1 (de) * 2020-02-24 2021-08-25 SUSPA GmbH Reibungsdämpfer
US11946522B2 (en) 2020-02-24 2024-04-02 Suspa Gmbh Frictional damper
US11320022B1 (en) 2020-11-20 2022-05-03 Hamilton Sundstrand Corporation Friction tubes
US11703105B2 (en) 2020-11-20 2023-07-18 Hamilton Sundstrand Corporation Friction tubes
IT202100005237A1 (it) * 2021-03-05 2022-09-05 Milano Politecnico Dispositivo smorzatore di vibrazioni
WO2022185273A1 (en) * 2021-03-05 2022-09-09 Politecnico Di Milano Vibration damping device

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