KR102022963B1 - Gear device for washing machine - Google Patents

Abstract

The present invention relates to a gear device of a washing machine. The gear device of a washing machine according to an embodiment of the present invention comprises: an input shaft rotating in a normal or a reverse direction by a rotational force transmitted from a motor; a sun gear coupled through an upper end of the input shaft; multiple planetary gears formed to be engaged with the sun gear for receiving the rotational force from the sun gear and disposed to encompass an outer side of the sun gear; a bushing spaced downwards from an upper end of the input shaft coupled to the sun gear to be coupled by encompassing the outer diameter of the input shaft; a first magnet provided at an upper end of the bushing; and a second magnet which is coupled to a lower end of the sun gear to face the first magnet while being spaced at a predetermined gap from the first magnet, and in which identical polarities are disposed in the direction facing the first magnet. According to an embodiment of the present invention, the gear device can maintain the position of the input shaft with magnetic force by adoption of the planetary gears when being applied to the washing machine with a structure that a shaft is separated therefrom to be capable of suppressing vibration and noises generated between the gears.

Description

Gear device of washing machine {GEAR DEVICE FOR WASHING MACHINE}

The present invention relates to a gear device of a washing machine that can suppress vibration and noise generated between the gears.

The washing machine is rotated by a motor in which the rotating shaft is arranged vertically. The washing machine is different from the object that rotates during the washing and rinsing process and the dehydration process.

In the washing and rinsing process, a pulsator provided at the bottom of the laundry receiving space inside the washing machine rotates. In the dehydration process, the drum, which is the laundry receiving space, rotates as a whole. The drum is rotatably installed in a tub that can hold water, and the tub is buffered against the body in the body of the washing machine.

On the other hand, as a gear device applied to a washing machine, the conventional planetary gear uses a backlash to increase gear reliability. However, when using the backlash between the gears there is a problem that noise and vibration occurs.

On the other hand, in order to reduce noise and vibration, a helical gear is used instead of the spur gear in the gear device applied to the washing machine. However, when the helical gear is used, thrust is generated in the axial direction, which may adversely affect product reliability.

As a prior document related to the present invention, Korean Patent Publication No. 10-1413181 (2014.06.27. Notice) discloses a motor driving apparatus for a washing machine, and FIGS. 1 and 2 are cross-sectional views of a conventional washing machine motor driving apparatus. And plan view.

As shown, the conventional motor drive device for a washing machine includes a pulsator 8 rotatably disposed in the dehydration tank, and a motor 10 for selectively rotating the dehydration tank and the pulsator 8 in the lower part of the washing tank. It was configured to include.

The motor 10 is separated from the double stator 40, the outer rotor 20 connected to the pulsator rotating shaft 4 to the outer circumferential surface of the double stator 40, and the dewatering tank spaced apart from the inner circumferential surface of the double stator 40. It consists of an inner rotor 30 connected to the rotation shaft 6. The outer rotor 20 includes a first back yoke 24 and a first magnet 26, and the inner rotor 30 includes a second back yoke 34 and a second magnet 36. The stator 40 was comprised including the 1st, 2nd coils 42 and 44 and the split core 60. As shown in FIG.

As such, the conventional motor driving apparatus for a washing machine is composed of two rotors and two stators, and does not use a clutch in a manner of selectively driving multiple motors using one inverter.

As another prior document related to the present invention, Korean Patent Publication No. 10-1997-0065854 (published on October 13, 1997) discloses a sun gear thrust preventing device of a reduction gear for a washing machine. In the case of the conventional reduction gear for a washing machine disclosed herein, it is configured to prevent thrust of the sun gear by using a guide pin.

However, when using a structure such as a guide pin there was a limit to suppress the vibration and noise generated between the gear to a satisfactory level.

In addition, as another prior document related to the present invention, Korean Patent Publication No. 10-1999-0031188 (1999.05.06. Publication Date) discloses a deceleration device of a washing machine. The conventional washing machine speed reduction device is configured such that the upper and lower cover is in close contact with the upper and lower sides of the sun gear, to prevent the flow in the vertical direction due to the repeated thrust, and to reduce the noise by the thrust. there was.

However, according to such a conventional structure, the upper and lower covers only physically suppress the vertical flow due to the thrust during operation of the sun gear, and it was difficult to prevent vibration and noise generated between the gears in advance.

Therefore, there is a need for a method capable of preventing vibrations and noise generated between the gears by appropriately maintaining the position of the shaft in the geared system for a washing machine in which the planetary gear is applied to separate the shaft.

An object of the present invention is to provide a gear device of a washing machine that is applied to the planetary gear and the shaft is separated, and that can maintain the position of the input shaft coupled to the sun gear by magnetic force to suppress vibration and noise. do.

It is an object of the present invention to provide a gear device of a washing machine capable of quiet operation of the washing machine by suppressing vibration and noise generated between the gears and increasing the reliability of the gear.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention, which are not mentioned above, can be understood by the following description, and more clearly by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

According to an aspect of the present invention for achieving the above object, the planetary gear is applied to the gear unit of the washing machine having a structure in which the input shaft coupled to the sun gear is separated from each other by maintaining the position of the input shaft constant It is possible to provide a gear unit of the washing machine that can reduce the vibration and noise.

The gear device of the washing machine according to an embodiment of the present invention for this purpose is the input shaft to rotate in the forward and reverse directions by the rotational force transmitted from the motor, the sun gear coupled through the top of the input shaft, the sun to receive the rotational force from the sun gear It is formed so as to be meshed with the gear, and includes a planetary gear arranged to surround a plurality of the outer side of the sun gear, and the bush spaced apart from the upper end of the input shaft to which the sun gear is coupled to surround the outer diameter of the input shaft, The first magnet is provided at the top of the bush, and the first magnet is coupled to the lower end of the sun gear to face the first magnet with a gap of the first magnet and a set size, the same pole is disposed in the direction facing the first magnet We include 2 magnets.

As the first pole and the second magnet are formed with the same pole in a direction facing each other, a gap of a predetermined size may be kept constant by the repulsive force generated therebetween. As a result, even when helical gears are used instead of spur gears, thrust generated in the axial direction can be suppressed to improve product reliability and reduce noise.

According to another aspect of the present invention for achieving the another object can be provided a gear device of the washing machine capable of suppressing vibration and noise generated in the planetary gear.

Gear device of the washing machine according to another embodiment of the present invention for this purpose, the first magnet is coupled in a ring shape corresponding to the top of the bush, the second magnet is coupled in a ring shape corresponding to the bottom of the sun gear, Vibration and noise generated from the planetary gears can be suppressed by the repulsive force between the 1 and 2 magnets, so that the washing machine can be quietly operated, and the durability of the gears can be improved and product reliability can be improved.

According to the present invention, a planetary gear is applied to the washing machine of which the shaft is separated, and in this case, the position of the shaft can be maintained at a predetermined position by using the force of the permanent magnet, thereby suppressing vibration and noise generated between the gears. There are possible advantages

In addition, according to the present invention, the position of the sun gear shaft can be fixed at all times by arranging permanent magnets in the sun gear and the plastic bush or bearing housing, so that a quiet operation of the washing machine can be performed and product reliability can be improved.

In general, a gear applied to a washing machine uses a helical gear to overcome a noise problem. In this case, thrust occurs in the axial direction, causing noise and vibration, and deteriorating gear reliability. The present invention is a gear device of a washing machine having such a planetary gear applied and the shaft is separated, it is possible to maintain the position of the shaft by using a magnetic force, so that the mechanism or physical means that was conventionally intended to fix the position of the shaft Compared to the case of using a more quiet operation is possible and the effect of suppressing vibration and noise can be maximized.

In addition to the effects described above, the specific effects of the present invention will be described together with the following description of specifics for carrying out the invention.

1 and 2 are a cross-sectional view and a plan view schematically showing a gear device of a conventional washing machine.
3 is a cross-sectional view briefly showing a driving device of a washing machine including a gear device of a washing machine according to an embodiment of the present invention.
4 is a cross-sectional view illustrating a coupling relationship between a gear device, an input shaft, an inner shaft, and an outer shaft of a washing machine according to an embodiment of the present invention.
FIG. 5 is an enlarged cross-sectional view of region 'A' of FIG. 3.
6 and 7 is a coupling configuration showing the coupling structure between the sun gear, the planetary gear, the input shaft constituting the gear device of the washing machine according to an embodiment of the present invention in different directions.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification. In addition, some embodiments of the invention will be described in detail with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

In describing a component of the present invention, when a component is described as being "connected", "coupled" or "connected" to another component, the component may be directly connected to or connected to that other component. It is to be understood that other components may be "interposed" between each component, or that each component may be "connected", "coupled" or "connected" through other components.

3 is a cross-sectional view briefly showing a driving device of a washing machine including a gear device of a washing machine according to an embodiment of the present invention.

As shown, the driving device of the washing machine according to an embodiment of the present invention, the sun gear 100, the input shaft 110, the planetary gear 200, the inner shaft 310 receives the rotational force from the motor 800 ), An outer shaft 320, a clutch 400, and a bearing housing 500.

The bearing housing 500 is disposed under the tub (not shown) of the washing machine, and the motor 800 is installed at intervals below the washing machine. Bearing housing 500 is fixed to the tub (not shown) of the washing machine is made of a structure that does not rotate. The bearing housing 500 may be supported by the first bearing 610 and the second bearing 620.

The motor 800 includes a stator 810 and a rotor 820 and generates rotational force electrically. The rotational force generated by the motor 800 is transmitted through the input shaft 110. The rotational force may be output through the inner shaft 310 and / or the outer shaft 320.

The inner shaft 310 and the outer shaft 320 may be installed concentrically with the input shaft 110. In this case, the inner shaft 310 may have a structure that is always connected to the rotor 820 of the motor 800. In contrast, the outer shaft 320 may be connected to the upper part of the washing machine drum, and the lower part thereof may be selectively connected to the rotor 820. That is, whether the outer shaft 320 is connected to the rotor 820 by the clutch 400 may be determined. At least one seal 330 may be provided between the inner shaft 310 and the outer shaft 320.

On the other hand, the gear device in the driving device of the washing machine is the input shaft 110, the sun gear 100, the sun gear 100 is integrally coupled to the input shaft 110 receives the rotational force from the motor 800 It includes a planetary gear 200 disposed to surround the outside of the.

That is, the sun gear 100 is located at the end of the input shaft 110, a plurality of planetary gear 200 may be configured to be engaged with each other so as to surround the outside of the sun gear 100. .

At this time, the gear device of the washing machine according to an embodiment of the present invention, the input shaft 110, the sun gear 100, the planetary gear 200, the bush 115, the first magnet 120, the second magnet ( 140).

Hereinafter, a gear device of a washing machine according to an embodiment of the present invention will be described in detail with reference to FIGS. 4 and 5.

4 is a cross-sectional view illustrating a coupling relationship between a gear device, an input shaft, an inner shaft, and an outer shaft of a washing machine according to an embodiment of the present invention, and FIG. 5 is an enlarged cross-sectional view of a region 'A' of FIG. 3.

As shown, the input shaft 110 may be configured to rotate in the forward and reverse directions by the rotational force transmitted from the motor 800 (see FIG. 3).

The sun gear 100 may be coupled in a unitary structure through the top of the input shaft 110.

At this time, the bush 115 is coupled to be spaced apart from the upper end of the input shaft 110 to which the sun gear 100 is coupled at a predetermined interval. Bush 115 may be coupled in a shape surrounding the outer diameter of the input shaft 110 may be configured to support the up and down flow of the input shaft (110).

The planetary gear 200 may be disposed to surround a plurality of the outer side of the sun gear 100. The planetary gear 200 disposed as described above may be configured to rotate in engagement with the circumferential direction of the sun gear 100 so as to receive a rotational force in association with the rotation of the sun gear 100.

In this case, in order to reduce noise and vibration generated between the gears, a helical gear may be used instead of the spur gear, and thrust may occur in the axial direction according to the use of the helical gear.

Accordingly, the magnetic force can be used to suppress vibration and noise in the planetary gear and to suppress thrust generated in the helical gear.

As a specific example, at least one permanent magnet (hereinafter referred to as a 'first magnet') 120 is disposed on the top of the bush 115 and at least one permanent magnet is disposed at the bottom of the sun gear 100 in a position facing the same. The magnet 140 (hereinafter referred to as 'second magnet') is disposed.

In other words, the first magnet 120 may be coupled to surround the input shaft 110 at the top of the bush. The second magnet 140 may be coupled to the lower end of the sun gear 100 so as to face the first magnet 120 by being spaced apart from the first magnet 120 to have a gap G of a set size (see FIG. 5). have.

However, since the repulsive force must be applied to the first magnet 120 and the second magnet 140 so as to maintain the gap G (see FIG. 5) of a set size between each other, the same pole (for example, N pole and N pole, or S pole and S pole).

As such, the first magnet 120 and the second magnet 140 are formed in the same pole in the direction facing each other to maintain the gap (G, Fig. 5) of the set size by the repulsive force generated between each other Can be. As a result, the thrust generated in the axial direction can be suppressed to obtain the effect of reducing vibration and noise.

On the other hand, the upper carrier 210, the lower carrier 220 may be provided on the upper side and the lower side of the planetary gear 200 is wrapped around the outer side of the sun gear 100, the fixing pin 230 is formed therebetween Can be combined with the planetary gear 200. The inner ring gear 240 may be rotatably coupled to the inside of the brake drum.

As shown in FIG. 5, the first magnet 120 is provided at an upper end of the bush 115, and may have a ring shape corresponding to the upper end size and shape of the bush 115.

The ring-shaped first magnet 120 is coupled to surround the input shaft 110 while fixing the bush 115 to the top.

The second magnet 140 may have a ring shape corresponding to the bottom size and shape of the sun gear 100. However, since the gap G of a predetermined size should be maintained between the first and second magnets 120 and 140, the first and second magnets 120 and 140 may be disposed such that the same poles are located in a direction facing each other. have.

Meanwhile, the second magnet 140 may have the same cross-sectional area as the first magnet 120 as shown in FIG. 5, but is not limited thereto. For example, as illustrated in FIGS. 6 and 7, the size of the cross-sectional area of the second magnet 140 may be larger than that of the first magnet 120.

6 and 7 is a coupling configuration showing the coupling structure between the sun gear, the planetary gear, the input shaft constituting the gear device of the washing machine according to an embodiment of the present invention in different directions.

6 and 7, the sun gear 100 is integrally coupled to the top of the input shaft 110. In addition, the bush 115 is disposed at an upper end of the input shaft 110 at a predetermined interval below the sun gear 110.

The planetary gear 200 may be provided in plural, but in FIG. 6 and FIG. 7, only one planetary gear 200 is represented to clearly show the engagement state between the planetary gear 200 and the sun gear 100.

The planetary gear 200 may be disposed to surround the outside of the sun gear 100. When the rotational force generated from the motor is transmitted to the sun gear 100 through the input shaft 110, the sun gear 100 rotates. ), The planetary gear 200 rotates.

However, as the helical gear is used for the purpose of suppressing vibration and noise, thrust may be induced in the axial direction of the input shaft 110, and such thrust may be generated between the first and second magnets 120 and 140. Reliability can be used to support stably.

That is, even when thrust occurs according to the shape of the helical gear, the position of the input shaft 110 may be maintained at the correct position by using the repulsive force between the first and second magnets 120 and 140.

Although not separately illustrated, the first magnet 120 and the second magnet 140 may be formed by combining divided magnet blocks in a ring shape.

For example, the first magnet 120 may include a plurality of arc shaped magnet blocks divided into predetermined center angles. In other words, the arc magnet blocks divided into three are prepared at a center angle of 180 degrees, and the arc magnet blocks are assembled in an arc direction through the upper end of the bush 115, and then combined and used in a ring shape.

Similarly, the second magnet 140 may also include a plurality of arc shaped magnet blocks divided into predetermined center angles. That is, three arc-shaped magnet blocks are prepared at a center angle of 180 degrees, and the arc-shaped magnet blocks may be combined and used in a ring shape through the lower end of the sun gear 100. Here, the number and center angle of the arc-shaped magnet block is changeable, it may be used divided into four forms with a center angle of 90 degrees or may be divided into other numbers and forms.

On the other hand, the first and second magnets (120, 140) when the thrust generation direction is changed according to the coupling condition between the sun gear 100 and the planetary gear 200, the installation position may be changed, if necessary, Plural pieces may be installed and used in the downward direction.

As described above, according to the configuration and operation of the present invention, the planetary gear is applied to be used in the washing machine of the shaft is separated, in this case, it is possible to maintain the position of the shaft in a predetermined position using the force of the permanent magnet. . As a result, vibration and noise suppression occurring between gears is possible.

In addition, the permanent position of the sun gear shaft can be fixed at all times by disposing the permanent magnet in the sun gear and the plastic bush or the bearing housing, so that the washing machine can be quietly operated and the product reliability can be improved.

Helical gears are mainly used in the gears applied to the conventional general washing machines to overcome noise problems. In this case, however, thrust is generated in the axial direction, causing noise and vibration, and deteriorating gear reliability.

According to the present invention, in the gear unit of a washing machine having a planetary gear and a shaft separated, the position of the shaft can be kept constant by using a magnetic force. Quiet operation is possible and the effect of suppressing vibration and noise can be maximized.

As described above, the present invention has been described with reference to the drawings, but the present invention is not limited to the embodiments and drawings disclosed herein, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. It is obvious that modifications can be made. In addition, even if the above described embodiments of the present invention while not explicitly described and described the operation and effect according to the configuration of the present invention, it is obvious that the effect predictable by the configuration is also to be recognized.

100: sun gear
110: input shaft
115: bush
120: first magnet
140: second magnet
200: planetary gear
210: upper carrier
220: lower carrier
230: retention pin
240: inner ring gear
310: inner shaft
320: outer shaft
330: seal
400: clutch
500: bearing housing
610: first bearing
620: second bearing
800: motor
810: stator
820: rotor

Claims (7)

An input shaft rotating forward and backward by a rotational force transmitted from the motor;
A sun gear coupled through the top of the input shaft;
A planetary gear formed to be engaged with the sun gear so as to receive rotational force from the sun gear, and disposed to surround a plurality of sun gears; And
And a bush coupled to surround the outer diameter of the input shaft by being spaced downward from an upper end of the input shaft to which the sun gear is coupled.
A first magnet provided at an upper end of the bush; And
And a second magnet coupled to a lower end of the sun gear to face the first magnet with a gap of the first magnet and a predetermined size, and having the same pole disposed in a direction facing the first magnet.
The sun gear and the planetary gear is a helical gear,
The first magnet and the second magnet, the same pole is formed in a direction facing each other, even if the thrust is generated according to the shape of the helical gear by the repulsive force generated between each other the size of the gap is kept constant Characterized
Gear of washing machine.
delete The method of claim 1,
The first magnet,
Characterized in that the ring shape corresponding to the upper end of the bush
Gear of washing machine.
The method of claim 3,
The first magnet,
It comprises a plurality of arc-shaped magnet blocks divided into a predetermined center angle,
The plurality of arc-shaped magnet block is characterized in that coupled to the ring shape through the upper end of the bush around the input shaft
Gear of washing machine.
The method of claim 1,
The second magnet,
Characterized in that the ring shape corresponding to the lower end of the sun gear
Gear of washing machine.
The method of claim 5,
The second magnet,
It comprises a plurality of arc-shaped magnet blocks divided into a predetermined center angle,
The plurality of arc-shaped magnet block is characterized in that coupled to the ring shape through the lower end of the sun gear around the input shaft
Gear of washing machine.
The method of claim 1,
The second magnet,
It has the same cross-sectional area as the first magnet or has a larger cross-sectional area than the first magnet
Gear of washing machine.

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