KR19980058624U - Suspension of washing machine - Google Patents

Abstract

The present invention relates to a suspension device for a washing machine which elastically holds a washing tub in a main casing through a buffer member, wherein the buffer member includes a plurality of buffer sections having different spring constants in the vertical direction . As a result, it is possible to provide a superior effect that the vibration and shock transmitted when the apparatus is operated can be effectively damped, and the noise emitted to the outside can be reliably reduced, regardless of the capacity and size of the laundry to be introduced into the washing tub do.

Description

Suspension of washing machine

The present invention relates to a suspension of a washing machine.

Generally, a washing machine is constituted by a washing machine in which laundry is contained in a main body casing forming an outer appearance, and a load driving part for washing laundry in the washing machine. The washing machine is resiliently retained in the main body casing by a suspension device. The suspension device can be installed in various forms according to the characteristics and applications of the device, and functions to buffer vibrations and shocks transmitted through the buffer spring by loading the laundry by the laundry. That is, when the laundry loaded in the washing tub is not uniformly distributed in the washing tub, the washing tub is run in one direction while the laundry is washed, rinsed, and dewatered. In this case, the washing tub can be operated in a balanced state .

However, in such a suspension device, the buffer spring for supporting the washing tub vibrates at a certain frequency when the device is operated, so that a resonance phenomenon occurs and the vibration and impact are transmitted to the main casing. Particularly, in the dewatering process in which the laundry is rotated at a high speed to dewater, vibrations are severely transmitted from the washing tank that performs the biased rotation, thereby causing the apparatus noise. Therefore, in recent years, many suspension devices designed to attenuate vibration and shock transmitted from a washing tub have been proposed.

FIG. 8 is a partially exploded perspective view of a suspension mounted on a washing machine rotating type washing machine, and FIG. 9 is an assembled sectional view of FIG. The conventional suspension device 31 is constituted by a circular bar-like suspension bar 33 and a damping portion 37 provided at one side end region of the suspension bar 33. The damping portion 37 is constituted by a damping casing 39 penetrating by the suspension bar 33 and provided so as to be able to flow along the longitudinal direction thereof and a buffer spring 41 accommodated in the damping casing. The suspension bar 33 is formed with a damper plate 35 protruding in a radial direction on its free end. The damper plate 35 is accommodated in the damping casing in a state in which the buffer spring 41 is supported on the upper surface thereof.

The suspension 31 having such a configuration is installed in each corner area of the washing tub, and the outer surface of the damper casing 39 comes into contact with the washing tub. Thus, when the laundry is received in the washing tub, the buffer spring 41 in the damper casing is upwardly biased by the load transmitted thereby, and even if the laundry is accommodated in one side, the buffer spring 41 So that it is possible to maintain almost equilibrium state.

When the operation of the device is started, the buffer spring 41 buffers the load of the washing tank by the expansion and contraction action. At this time, the damper casing 39 is connected to the damper plate 35 ). Thus, the vibration and impact transmitted from the washing tub are attenuated by the mutual friction between the damper plate 35 and the damper casing 39. Therefore, it is preferable to accommodate a buffer spring 41 having a spring constant suitable for the size and capacity of the washing tub in the damping portion.

That is, the buffer spring 41 can accumulate the load proportional to its inherent spring constant with the torsional elastic energy, and the smaller the spring constant, the more excellent the expansion and contraction force. Therefore, when the spring constant of the cushioning spring 41 for elastically biasing the washing tub becomes small, vibration transmitted to the main body casing due to excellent expansion and contraction can be effectively reduced. However, in such a case, when a laundry having a large capacity is loaded in the washing tub, the load may exceed the elastic limit of the buffer spring 41, thereby causing a problem that the vibration transmitting force can be doubled. Thus, the maker of the washing machine mounts the suspension device 31 having the buffer spring 41 according to the size and capacity of the washing tub, based on the data verified through several experiments.

In the suspension device 31 of the conventional washing machine, since a single cushion spring 41 having a constant spring constant is provided in the damping portion, the cushion spring 41 for supporting the balanced running of the washing tub ) Can not perform the role properly. For example, in the washing tub, a laundry exceeding its own capacity may be introduced due to carelessness of the user. In this case, the buffer spring 41, which does not overcome the elastic limit, supports the balanced running of the washing tub And the vibration due to the resonance shape is transmitted to the main casing as it is. Thus, the transmitted vibration causes noise of the apparatus.

Therefore, the object of the present invention is to provide a washing machine capable of effectively using the washing machine in which the vibration and shock transmitted from the washing tub are effectively damped during operation of the washing machine, So that the noise can be surely lowered.

1 is a longitudinal sectional view of a washing machine provided with a suspension device according to the present invention,

2 is an enlarged perspective view of the suspension,

3 is an enlarged exploded perspective view of the damping portion,

Figure 4 is an assembled cross-sectional view of Figure 3,

5 to 7 are sectional views of a damping portion according to another embodiment of the present invention;

8 is a partially exploded perspective view of a conventional suspension device,

9 is an assembled sectional view of Fig.

Description of the Related Art [0002]

3: main body casing 5: washing tub

11: load driving part 21: suspension

22: suspension bar 23: damper plate

25: damping portion 26: buffer spring

27: partition plate 29: damper casing

According to the present invention, there is provided a suspension device for a washing machine, comprising: a washing tub in which a washing tub is housed in a main casing in a resilient manner with a buffer member interposed therebetween, wherein the buffer member has a spring constant different from each other in the vertical direction And a plurality of buffer sections.

Here, the buffer member is a plurality of buffer springs each having a different spring constant; It is preferable that the plurality of buffer springs are combined in series in the vertical direction.

A suspension bar having one end fixed to one side of the washing tub and the main body casing; A damper casing penetrating the suspension bar and capable of flowing along the longitudinal direction; And a damper plate slidable in the damper casing and fixed to and supported by the free end of the suspension bar, wherein the buffer member is supported by the damper plate and received in the damper casing.

In addition, it is possible to further comprise a plurality of isolation plates for separating the buffering members in the horizontal direction between the respective buffering zones.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a longitudinal sectional view of a washing machine provided with a suspension device according to the present invention. As shown in this drawing, the washing machine 1 is provided with a washing tub 5 and a power dividing and conveying unit 11 in the upper and lower parts thereof in the main body casing. The washing tub 5 is resiliently As shown in Fig. The washing tub has a cylindrical spin basket (7) rotatably installed in the washing tub. A pulsator (9) is provided in the spin basket to mix the laundry with the wash water and the detergent.

On the other hand, the power divider transmitting portion 11 is constituted by the driving motor 13 and the shaft assembly 15. These drive motors 13 and shaft assemblies 15 are interconnected via a drive pulley 17 and a belt 19 so that the drive force of the drive motor 13 is transmitted to the shaft assembly 15. The shaft assembly 15 receiving the rotational driving force selectively rotates the spin basket 7 or the pulsator 9 in a predetermined direction. That is, when washing and rinsing, the spin basket 7 is stopped and only the pulsator 9 is rotated to the left and right to perform the washing process. When the spin basket 7 and the pulsator 9 are dewatered, the spin basket 7 and the pulsator 9 are rotated in one direction And the dehydration process is performed.

Fig. 2 is an enlarged perspective view of the suspension, Fig. 3 is an enlarged exploded perspective view of the damping portion, and Fig. 4 is an assembled sectional view of Fig. The present suspension device 21 includes a suspension bar 22 of a circular rod shape and a damping portion 25 provided at one end of the suspension bar 22, as described with reference to FIG. The suspension bar 22 is provided with a damper plate 23 extended at one end of the damper portion 25 in the radial direction.

The damping unit 25 includes a plurality of buffer springs 26 having different spring constants and a plurality of partition plates 27 having the same shape as the damper plate 23 and a damper casing 29, Lt; / RTI > A through hole through which the suspension bar 22 vertically penetrates is formed in the central area of each partition plate 27. A through hole through which the suspension bar 22 vertically penetrates also is provided in the upper part of the damper casing 29. A plurality of buffer springs 26 and a partition plate 27 are alternately fitted to the suspension bar 22 and the buffer springs 26 gradually move from the lower side of the suspension bar 22 toward the upper side, So that the constant is increased.

The damper plate 23 and each partition plate 27 are formed on the upper surface thereof with a receiving rib 24 provided so as to sandwich the lower end of the buffer spring 26. Each buffer spring 26 is connected to the suspension bar 22 In the longitudinal direction. The damper casing 29 is also penetrated by the suspension bar 22 on the upper side of the buffer spring 26 and the partition plate 27 sandwiched between the suspension bar 22 and housed in the interior of the suspension bar 22, Respectively. At this time, the damper casing 29 is movable along the longitudinal direction of the suspension bar 22 by the expansion and contraction action of the buffer spring 26.

1, the upper end portion of the suspension 21 is connected to the flange portion 4 extending inwardly from the upper inner wall surface of the main body casing 3, and the lower portion of the washing tub 5 And the damping portion 25 provided at the lower end of the flange portion 6 extending outward from the outer wall surface are in contact with each other. The damping portion 25 is formed so that the lower surface of the flange portion 6 provided in the washing tub 5 and the upper portion of the damper casing 29 are brought into mutual contact with each other so that the laundry Is transmitted to the plurality of buffer springs (6) provided therein.

At this time, the plurality of buffer springs 26 provided along the longitudinal direction of the suspension bar 22 in the damping portion 25 have characteristics that can not be obtained by a single conventional buffer springs. At this time, The spring constant can be obtained by the following equation.

,

....

(here, Is a spring constant from the lower side of each buffer spring provided in the damping section, Is the spring constant of the cushioning spring combined along the length of the suspension bar.)

Hereinafter, the operation of the damping suspension bar will be described with reference to the above equations.

When a predetermined amount of laundry is introduced into the washing tub, the load is transmitted to the damper casing 29, and the load is transmitted to the plurality of buffer springs 26 at this time. At this time, the spring constant of the damping portion 25 is set such that the spring constants of the plurality of buffer springs 26 arranged along the longitudinal direction of the suspension bar 22 And the load transmitted from the washing tub 5 is the spring constant The buffer spring 26a disposed at the lower side of the plurality of buffer springs having the smallest spring constant is first elastically deformed and contracted with respect to the load. At this time, the buffer spring 26a accumulates a load proportional to a predetermined load, that is, a spring constant, from the washing tub 5 with torsional elastic energy.

When the lower cushion spring 26a having the smallest spring constant is completely contracted, the spring constant of the plurality of cushion springs 26 combined at this time is increased by a predetermined amount . Thus, the load of the washing tub 5 exceeding the elastic limit of the buffer spring 26a having the smallest spring constant is increased upward. In this case also, when the load of the washing tub 5 exceeds the spring constant of the combined buffer spring 26, the buffer spring 26b immediately above the contracted buffer spring 26a, that is, The small buffer spring 26b is elastically deformed. This buffer spring 26b also accumulates the torsional elastic energy from the washing tub 5.

As a result, the spring constant of the damping unit 25 increases stepwise according to the load of the washing tub 5, and conversely, the washing tub 5 loses its load to the cushion spring 26 contracting in stages , So that the damping unit 25 absorbs all of the load corresponding to the amount of laundry contained in the washing tub. Therefore, regardless of the amount of laundry to be introduced into the washing tub, the washing tub 5 can be operated in a balanced manner. When the amount of the laundry is small, the spring constant of the buffer spring 26 accommodated in the damping portion 25 is small. Therefore, the noise generated by the vibration of the buffer spring 26 during the washing or dewatering operation of the appliance It is possible to attenuate effectively.

The damping portion 25 provided at the other end of the suspension 21 is fixed to the flange portion 4 formed on the body casing 3 and the damping portion 25 provided at the other end is fixed to the washing tub 5, The damping portion 25 provided on the suspension device 21 is provided so as to be in contact with the flange portion 4 of the main casing 3 so as to be in contact with the flange portion 6 of the main casing 3 It is needless to say that the same object as described above can be achieved.

5 to 7 are sectional views of a damping portion according to another embodiment of the present invention. A single cushioning spring 26 is provided in the damping portion 31 of Fig. 5, and the cushioning spring 26 is formed such that the interval of the pitch is gradually deformed in one direction. 6, a plurality of buffer springs 26 arranged concentrically at high heights are accommodated in the damping portion. In FIG. 7, a buffer spring 26 of a conical coil shape having a constant pitch is accommodated. When the downward load is applied from the upper side, the buffer springs 26 provided in the respective damping portions are also contracted stepwise to support the load. At this time, the spring constant of the buffer spring 26 It is possible to achieve the same object as described above.

INDUSTRIAL APPLICABILITY As described above, the suspension bar apparatus of the washing machine according to the present invention can be used irrespective of the capacity and size of laundry to be introduced into the washing tub, effectively damping vibrations and shock transmitted from the washing tub at the time of operation of the washing machine, It is possible to reliably reduce the noise of the radiating device.

Claims (4)

1. A suspension apparatus for a washing machine, comprising: a washing tub having a washing tub; The cushioning member, And a plurality of buffer sections having different spring constants in the vertical direction. The method according to claim 1, The cushioning member, A plurality of buffer springs each having a different spring constant; Wherein the plurality of buffer springs are combined in series in the vertical direction. 3. The method of claim 2, A suspension bar having one end fixed to one side of the washing tub and the main body casing; A damper casing penetrating the suspension bar and capable of flowing along the longitudinal direction; And a damper plate slidable in the damper casing and fixed to and supported by the free end of the suspension bar; Wherein the buffer member is supported by the damper plate and is accommodated in the damper casing. The method according to any one of claims 1 to 3, Further comprising a plurality of separating plates for separating the buffering members in the horizontal direction between respective buffering zones of the buffering member.