KR101771457B1 - Washing machine - Google Patents

Abstract

The present invention relates to a washing machine capable of preventing breakage of a clutch and a motor by detecting whether a clutch for connecting a washing shaft and a dewatering shaft is operating normally, Dehydrating shrinkage for rotating the drum located inside the water tank; A rotor coupled to the washing shaft and transmitting a rotational force; A clutch selectively engaging with the rotor by up and down movement to selectively transmit rotational force of the rotor to the dehydrating shafts; A shielding member mounted on the clutch; A permanent magnet provided on the rotor and a magnetic sensor facing the permanent magnet, wherein the shielding member shields the permanent magnet and the magnetic sensor by movement of the clutch, and the magnetic sensor detects the position of the clutch .

Description

Washing machine {WASHING MACHINE}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a washing machine, and more particularly, to a washing machine capable of detecting a normal operation of a clutch connecting a washing shaft and a dewatering shaft to prevent breakage of a clutch and a motor.

Generally, a washing machine uses a mechanical force to forcibly form a stream of washing water in a drum, thereby promoting the chemical action of the detergent. In addition, the washing machine applies a physical action such as friction or impact to the laundry, Is a device that can be realized.

Such a washing machine rotates a washing blade (pulsator) provided at a lower portion of the drum in the forward and reverse directions to form a water flow for washing. Therefore, such a washing machine requires dehydration shrinkage for rotating the drum and washing shafts for driving the laundry blades. That is, the washing machine is provided with a clutch for selectively driving the two driving shafts (washing shafts, dehydrating shafts). Accordingly, the clutch transmits the rotational force generated by the driving motor to the washing wing during washing, and selectively transmits the rotating force to the washing wing and the drum when dewatering.

Fig. 1 schematically shows the construction of a general washing machine.

Referring to FIG. 1, the washing machine 10 includes a main body 8 forming an outer appearance, and a water storage tank 1 is provided in the main body. Inside the water storage tank 1, a drum 2 rotated by a drive motor 7 is rotatably provided. At the lower portion of the drum is provided a laundry blade 3 for washing and is rotatable by a driving motor 7.

A driving motor 7 for generating a rotational force for rotating the drum and the laundry blade is provided at a lower portion of the water storage tank 1. The drum receives the rotational force of the driving motor by the dew condensation shaft 5, The rotary shaft 6 receives the rotational force of the driving motor. The dehydrating shafts and the washing shafts are concentrically provided, and the washing shafts are located inside the dewatering shafts. The dehydrating shafts and washing shafts are rotatably supported by the bearing housing 4. [

On the other hand, the drive motor 7 includes a stator and a rotor. The stator includes a coiled coil and a magnet, and a rotor covering the outer circumferential surface of the stator is selectively coupled to the washing shaft and the dehydrating shafts. Particularly, the rotor rotates by electromagnetic interaction with the stator, thereby transferring rotational force to the washing shaft and the dehydrating shaft.

The selective engagement of the rotor of the drive motor with the dehydrating shafts and wash shafts is achieved by the clutch. The clutch is meshed with the washing shaft and movable up and down, and has a tooth surface that can be engaged with the rotor. Accordingly, the coupling between the washing shaft and the rotor is released at the time of rising, and the washing shaft is coupled with the rotor at the time of falling, thereby coupling the washing shaft with the rotor to transmit the rotating force of the rotor to the washing shaft. The clutch is vertically driven by a separate clutch motor.

The engaging and driving of the clutch and the rotor must be precisely performed. Otherwise, when the rotational force of the rotor is transmitted in a state in which the clutch is not fully engaged with the rotor, the tooth surface of the clutch may be damaged. In addition, when the rotor is rotated in a state where the clutch is not completely released from the rotor, a shock may be transmitted to the clutch motor, the washing shaft, and the dewaxing shafts. Thereby increasing the risk of malfunction and breakage of the washing machine.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art.

In other words, it is an object of the present invention to provide a washing machine which precisely senses the position of the clutch and precisely senses engagement / disengagement between the clutch and the rotor to prevent breakage of the component and prevent malfunction.

Disclosure of Invention Technical Problem [8] The present invention provides the following technical constructions to solve the above technical problems.

The washing machine of the present invention comprises: a washing shaft for rotating a washing blade; Dehydrating shrinkage for rotating the drum located inside the water tank; A rotor coupled to the washing shaft and transmitting a rotational force; A clutch selectively engaging with the rotor by up and down movement to selectively transmit rotational force of the rotor to the dehydrating shafts; A shielding member mounted on the clutch; A permanent magnet provided on the rotor and a magnetic sensor facing the permanent magnet, wherein the shielding member shields the permanent magnet and the magnetic sensor by movement of the clutch, and the magnetic sensor detects the position of the clutch .

Wherein the permanent magnet has a ring shape and is coupled to be concentric with the rotor, and the shield member has a cylindrical shape and is coupled concentrically to the clutch, wherein an inner diameter of the cylindrical shield member is larger than an outer diameter of the ring- And the shielding member surrounds the outer circumferential surface of the permanent magnet by the movement of the clutch.

Here, the cylindrical shield member enters and intercepts between the permanent magnets facing each other and the magnetic sensor by the movement of the clutch.

The magnetic sensor is spaced outwardly at a predetermined interval from the outer circumferential surface of the permanent magnet, and faces the permanent magnet.

In addition, the shielding member has a steel-based metal material.

Meanwhile, the washing machine of the present invention comprises: a washing shaft for rotating a washing blade; Dehydrating shrinkage for rotating the drum located inside the water tank; A rotor coupled to the washing shaft to transmit rotational force; A clutch selectively engaging with the rotor by up and down movement to selectively transmit rotational force of the rotor to the dehydrating shafts; An annular metal plate mounted on the clutch; And a magnetic force sensing device having permanent magnets and magnetic sensors respectively coupled to respective end portions of the metallic connection member bent at both ends in the same direction and spaced apart by a predetermined distance, The magnetic sensor may detect an increase in magnetic force between both ends of the connecting member by sensing the position of the clutch by approaching the magnetic force sensing device.

In one embodiment, the magnetic force sensing device is located below the clutch to sense a clutch fall associated with the rotor.

In another embodiment of the present invention, the magnetic force sensing device further includes a stopper positioned on the upper side of the clutch for sensing the rise of the clutch when the clutch is disengaged from the rotor, and a stopper for preventing the movement of the clutch And the magnetic force sensing device is coupled to a side surface of the stopper to sense that the clutch and the stopper are engaged.

Meanwhile, the washing machine of the present invention comprises: a washing shaft for rotating a washing blade; Dehydrating shrinkage for rotating the drum located inside the water tank; A rotor coupled to the washing shaft and transmitting a rotational force; A clutch selectively engaging with the rotor by up and down movement to selectively transmit rotational force of the rotor to the dehydrating shafts; A shielding member mounted on the clutch; And a magnetic force sensing device having permanent magnets and magnetic sensors respectively coupled to respective end portions of the metallic connection member bent at both ends in the same direction and spaced apart by a predetermined distance, Shielding between the permanent magnet and the magnetic sensor, and the magnetic sensor may be configured to sense the position of the clutch.

Wherein the magnetic force sensing device is disposed at a lower portion of the clutch and both end portions of the connecting member are directed toward the clutch side, the shielding member has a cylindrical shape and is coupled concentrically to the clutch, The outer circumferential surface of the shield member enters between the permanent magnet and the magnetic sensor.

In another embodiment, the magnetic force sensing device is located on the upper side of the clutch and both ends of the connecting member are directed toward the clutch side, and the shielding member has a cylindrical shape and is coupled concentrically to the clutch, The outer circumferential surface of the shield member may enter between the permanent magnet and the magnetic sensor when the clutch is released. Further, the clutch further includes a stopper for preventing the clutch from moving when the clutch is lifted up. The magnetic force sensing device is coupled to the side surface of the stopper, and detects the engagement of the clutch and the stopper.

Wherein the shielding member includes a connecting surface connected to an outer circumferential surface of the shielding member to form a receiving space, and one end of the magnetic force sensing device is accommodated in the receiving space so that the outer circumferential surface is spaced apart from the permanent magnet Shielding.

According to the present invention as described above, it is possible to precisely detect the engagement and disengagement between the clutch and the rotor by sensing the ascending and / or descending position of the clutch precisely.

Further, the present invention senses that the clutch and the rotor are completely engaged or disengaged, thereby preventing breakage or malfunction of components, thereby improving the reliability of the washing machine.

1 is a schematic view of a conventional general washing machine.
2 is an exploded perspective view of a washing machine driving part of the present invention.
3 is a perspective view of the washing machine driving unit according to the present invention.
4 and 5 are partial sectional views showing a first embodiment of the washing machine of the present invention.
6 is a partial sectional view showing a second embodiment of the washing machine of the present invention.
7 is a schematic diagram showing the principle of the second embodiment;
8 and 9 are partial sectional views showing a third embodiment of the washing machine of the present invention.
10 is a partial cross-sectional view showing a fourth embodiment of the washing machine of the present invention.
11 is a schematic view showing the principle of the fourth embodiment;
12 is a partial sectional view showing a fifth embodiment of the washing machine of the present invention.
13 is a schematic view showing the principle of the fifth embodiment.

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

In the washing machine of the present invention, a water storage tank is provided inside a body forming an outer appearance, and a drum rotated by a driving motor is rotatably provided inside the water storage tank. The lower portion of the drum is provided with laundry wings for washing and is rotatable by a driving motor. This configuration is a general configuration of the washing machine, and a detailed description thereof will be omitted.

FIG. 2 is an exploded perspective view of the washing machine driving part of the present invention, and FIG. 3 is a perspective view showing an assembled state of the washing machine driving part of the present invention. 2 and 3, the configuration of the magnetic force sensing device or the magnetic sensor capable of sensing the position of the clutch is not shown in detail. The specific configuration is described in more detail in each embodiment, and only the configuration in which the device capable of detecting the position of the clutch is combined is shown in Figs. 2 and 3 only.

2 and 3, a structure for forming a driving unit for driving a drum and a laundry blade of a washing machine includes a washing shaft 11 for rotating the washing blade, a dehydrating shrinking shaft (not shown) for rotating the drum located inside the water tank 12), a driving motor coupled to the washing shaft and configured to transmit a rotational force, a clutch (31) selectively engaged with the rotor by up and down movement to selectively transmit rotational force of the rotor to the dehydrating shafts ).

The washing shaft 11 protrudes through the center of the dewatering shaft to the inside of the drum, and the washing blade is coupled to the protruding end. The other end of the washing shaft extends downward and is coupled to the rotor 21 of the driving motor.

The dehydrating shafts (12) are installed concentrically through the washing shafts (11). One end of the dewatering shaft is coupled to the drum to transmit the rotational force to the drum, and the other end is coupled to the rotor 21 selectively by the clutch 31 to receive rotational force. As a result, a tooth surface (not shown) for engaging with the clutch is formed at the intermediate portion of the dewatering shaft, so that the clutch 31 is movable up and down along the dewatering shaft.

The washing shaft and the dewatering shaft are supported by the bearing housing 100 and are rotatable by the bearing 110. A bearing 110, a clutch 31, a clutch drive motor 36, and a drive motor are coupled to the bearing housing.

The driving motor is provided on the lower surface of the water storage tank and forms a driving force of the drum and the laundry blade, and includes a rotor (21) and a stator (22). The stator 22 has a ring shape and is provided with a wound coil. The rotor 21 has a container shape surrounding the stator and has a magnet inside to rotate around the stator by interaction with a coil provided on the stator. And a shaft coupling portion 23 for coupling the washing shaft and the dehydrating shaft is provided at the center of the rotor. The shaft coupling portion 23 is formed with an axial passage hole 23b through which the washing shaft 11 passes and a tooth surface 23a which is engaged with the tooth surface of the clutch. The shaft coupling portion and the rotor are integrally rotated, and the washing shaft passing through the shaft coupling portion is fixed to the shaft coupling portion by the nut 24 and rotates integrally.

The clutch 31 has a cylindrical configuration having teeth on both upper and lower surfaces. In addition, a through hole is formed at the center so that the washing shaft and the dehydrating shaft can penetrate. The inner circumferential surface of the through hole of the center portion is formed with a tooth surface so as to engage with the outer circumferential surface of the dehydrating shaft 12 and to be able to slide. Accordingly, the clutch is movable to a lowered position where the clutch slides along the dewatering shaft and is engaged with the rotor, and a raised position where the engagement of the rotor is released.

The clutch motor 36 is provided as a driving means for moving the clutch up and down. Further, a lever 33 for transmitting the driving force of the clutch motor to the clutch is coupled to the clutch side surface. Accordingly, the clutch receives the driving force of the clutch motor through the lever 33 and moves up and down along the dewatering shaft.

On the other hand, a lower tooth surface 34 is formed on the lower surface of the clutch 31 so as to engage with a tooth surface 23a formed on the shaft coupling portion 23 of the rotor. Further, a pressing spring 38 for firmly holding the coupling between the clutch and the rotor is provided to press the clutch toward the rotor.

On the other hand, a clutch stopper 32 fixed to the bearing housing 100 is provided on the clutch. The clutch stopper 32 is configured to suppress rotation of the clutch so that the clutch does not rotate after the disengagement of the clutch and the rotor, thereby causing no impact on the clutch motor, the washing shaft, and the dew condensation. The clutch stopper 32 has a lower tooth surface 32a. Therefore, an upper tooth surface 35 is provided on the upper surface of the clutch, and engaged with the tooth surface 32a of the clutch stocker.

The clutch 31 is moved up and down selectively to transmit the driving force of the driving motor and the rotational force by the rotation of the rotor 21 is selectively transmitted to the dew condensation shaft 13 and the washing shaft 11).

The present embodiment is for detecting whether or not the clutch is fully engaged with the rotor in the above-described configuration.

Figs. 4 and 5 show the operation of the clutch of the first embodiment and means for sensing the position of the clutch. 4 and 5, the present embodiment includes a shielding member 41 mounted on the clutch, a permanent magnet 42 provided on the rotor, and a magnetic sensor 50 facing the permanent magnet .

The shielding member 41 has a cylindrical configuration coupled along the inner circumferential surface of the lower tooth surface 34 of the clutch 31. Here, the shielding member may be formed so as to be inserted into the inner surface of the clutch, but not inside the surface of the clutch having a lower tooth surface. That is, as described later, the position where the coupling member is engaged with the lower portion of the clutch is not important as long as the shielding member can shield the gap between the permanent magnet and the magnetic sensor in accordance with the descent of the clutch.

However, the shielding member 41 should have a cylindrical shape and be coupled concentrically to the clutch. Also, it is preferable that the shielding member has a steel-based metal material. However, this means that the shielding member has a magnetizable material, and other magnetizable materials may be used. Accordingly, when the magnetic field is formed, the magnetic lines of force can be concentrated, thereby enabling shielding.

The permanent magnet 42 is coupled to the shaft coupling portion 23 of the rotor so that the permanent magnet has a ring shape and is concentric with the rotor. More specifically, the permanent magnet 42 is coupled to a surface of the annular cylindrical shape of the axial coupling portion forming the shaft hole 23b.

As shown in FIG. 4, the permanent magnet 42 and the shielding member 41 are both arranged in a cylindrical configuration so as to be concentric with each other. As shown in Fig. 5, the inner diameter of the cylindrical shielding member is formed to be larger than the outer diameter of the ring-shaped permanent magnet. Accordingly, when the clutch is lowered, the shielding member 41 covers the outer circumferential surface of the permanent magnet 42 by the movement of the clutch.

The magnetic sensor 50 is spaced outwardly at a predetermined interval from the outer circumferential surface of the permanent magnet so as to face the permanent magnet. The magnetic sensor is fixed and is coupled to a bearing stand (51) extending from the bearing housing (100) or the clutch stopper (32).

Here, the permanent magnet and the shield member are both cylindrical in shape and are arranged concentrically along the periphery of the drive shaft (dehydrating shafts). Even if the clutch rotates due to the rotation of the rotor, the permanent magnet and the shield member are not affected by the position of the magnetic sensor, Can be formed or shielded.

Referring to FIG. 4, the clutch 31 is engaged with the clutch stopper 32 at the raised position, so that the shielding member 41 does not affect the permanent magnet and the magnetic sensor. Accordingly, the permanent magnet forms a magnetic field around it, and the magnetic sensor facing the permanent magnet senses the magnetic force to sense that the clutch is not engaged with the rotor.

Referring to FIG. 5, the shielding member 41 shields the permanent magnet and the magnetic sensor by the movement of the clutch 31, and the magnetic sensor senses the position of the clutch. That is, the cylindrical shielding member 41 enters and intercepts between the permanent magnet 42 and the magnetic sensor 50 facing each other by the movement of the clutch. Generally, when a metallic member is placed around the magnet to magnetize it, the magnetic field of the magnet is concentrated on the metallic member. Therefore, when the shielding member 41 enters between the permanent magnet 42 and the magnetic sensor 50, the magnetic force lines of the permanent magnets are concentrated on the metallic shielding member, so that the magnetic field does not affect the magnetic sensor. That is, the magnetic sensor senses the coupling between the clutch and the shaft coupling portion due to the disappearance of the magnetic field that affects the magnetic sensor.

The above-described embodiment of the present invention can completely shield the magnetic field sensed by the magnetic sensor when the rotor and the clutch are engaged. In other words, it is much more accurate to sense the magnetic field completely than to detect the approach of the magnet. Accordingly, it is possible to precisely prevent breakage and malfunction of the driving part of the washing machine by sensing whether the rotor and the clutch are engaged with each other without malfunctioning according to the embodiment.

The present embodiment is configured to detect whether or not the clutch is completely engaged with the rotor in the above-described configuration, and it is configured such that a configuration capable of sensing an electronic signal, such as a rotating rotor, is not included.

6, the second embodiment is characterized in that an annular metal plate 43 mounted on the clutch and permanent magnets 63a and magnetic sensors 63b are attached to the respective ends of the metallic connecting member 61a whose both ends are bent in the same direction, (62a) are coupled to each other and are spaced apart from each other by a predetermined distance.

The annular metal plate 43 is configured to be coupled to the upper portion of the clutch, as shown in Fig. An upper portion of the clutch is provided with an annular extending surface 31a extending outward from the center of the clutch so that an upper tooth surface 35 is formed. The annular metal plate 43 is coupled to the lower surface of the extended surface 31a so as to be concentric with the clutch. Accordingly, the annular metal plate can always be positioned below the extended surface without being affected by the rotation of the clutch.

Referring to FIG. 7, the magnetic force sensing device 60a includes a metallic connecting member 61a, a magnetic sensor 62a, and a permanent magnet 63a, and is fixed and supported on a mount that is coupled to the clutch stopper or the bearing housing. The metallic connection member is formed in a 'C' shape or a 'A' shape, and has a magnetic sensor and a permanent magnet at each end as shown in FIG. At this time, both end portions are formed to bend or face in the same direction. That is, the magnetic sensor and the permanent magnet are arranged side by side in the same direction.

In this case, since the metallic connection member is present, a magnetic field is formed along the metallic connection member at one end of the magnet, and a magnetic field is formed at the other end of the magnet to form a call from the magnetic sensor. That is, a magnetic field is formed as indicated by a dotted line in FIG.

The magnetic force sensing device 60a is positioned below the metal plate so that the clutch senses a clutch fall associated with the rotor. Therefore, when the clutch is moved to the lowered position to engage with the rotor, the metal plate due to the movement of the clutch approaches the magnetic force sensing device.

Here, as the distance between the magnetic body and the metallic member decreases as the metallic member approaches the magnetic body such as the magnet, the magnetic force therebetween increases. Therefore, when the metal plate 43 descends and approaches the permanent magnet and the magnetic sensor, the magnetic force between both ends of the connecting member increases. Accordingly, the magnetic sensor senses the increased degree and senses the position of the clutch.

In the above configuration, the metallic annular metal plate 43 capable of increasing the magnetic force is used to amplify the degree of increase or decrease of the magnetic force that can be detected by the magnetic sensor. Therefore, according to the above-described structure, the magnetic sensor senses the approach of the clutch with a much higher sensitivity than that of detecting the position by the distance from the general permanent magnet, and whether or not the rotor and the clutch are engaged according to the improved accuracy It is possible to precisely prevent breakage and malfunction of the driving part of the washing machine in advance by detecting it without malfunction by way of example. In addition, since the electric device for sensing is not used in the rotor and the shaft coupling portion 23 as the rotating body, the reliability of operation is further improved.

The present embodiment is for detecting whether or not the clutch is completely disengaged from the rotor in the above configuration. That is, it is sensed that the clutch 31 is fully engaged with the clutch stopper 32 to prevent movement. There are two positions of the clutch. That is, there is a raised position in which the clutch is engaged with the clutch stopper so that the engagement between the rotor and the lowered position, which is engaged with the rotor to transmit the rotational force to the dehydrating shafts, is released and the clutch is prevented from unintended rotation. Therefore, if the clutch is not correctly positioned at each of these positions, a problem such as breakage may occur during power transmission, so that the clutch is ascended from the positions of the two clutches for precise control.

8 and 9 are sectional views showing the third embodiment. 8, the third embodiment is characterized in that an annular metal plate 43 mounted on the clutch and permanent magnets 63b and magnetic sensors 63b are attached to the respective ends of the metallic connecting member 61b bent in the same direction at both ends, And a magnetic force sensing device 60b, which are coupled to each other by a predetermined distance.

The annular metal plate 43 is configured to be coupled to the upper portion of the clutch, as shown in Fig. An upper portion of the clutch is provided with an annular extending surface 31a extending outward from the center of the clutch so that an upper tooth surface 35 is formed. The annular metal plate 43 is coupled to the lower surface of the extended surface 31a so as to be concentric with the clutch. Accordingly, the annular metal plate can always be positioned below the extended surface without being affected by the rotation of the clutch.

The magnetic force sensing device 60b includes a metallic connecting member 61b, a magnetic sensor 62b, and a permanent magnet 63b. The metallic connection member is formed in a 'C' shape or a 'A' shape, and has a magnetic sensor and a permanent magnet at each end thereof. At this time, both end portions are formed to bend or face in the same direction. That is, the magnetic sensor and the permanent magnet are arranged side by side toward the side of the clutch which is in the same direction.

The magnetic force sensing device (60b) is located on the side of the metal plate so that the clutch senses a clutch lift which is disengaged from the rotor. Here, a clutch stopper (32) for preventing the clutch from moving when the clutch is lifted is coupled to the bearing housing.

Therefore, in order for the clutch to be disengaged from the rotor to be able to safely rotate the washing shaft, the clutch must be engaged with the stopper to prevent movement. That is, the magnetic force sensing device 60b is fixedly coupled to the side surface of the stopper, and faces the side surface of the clutch to sense the engagement of the clutch with the stopper.

Fig. 8 shows the elevation position of the clutch. In FIG. 8, the clutch faces the magnetic force sensing device 60b. Therefore, when the metal plate 43 rises and approaches the permanent magnet 63b and the magnetic sensor 62b, the magnetic force between both ends of the connecting member 61b increases. Accordingly, the magnetic sensor 62b senses the increased degree and senses the position of the clutch 31. When the clutch is in this position, the upper tooth surface 35 of the clutch and the tooth surface 32a of the stopper engage to prevent the clutch from moving.

FIG. 9 shows the lowered position of the clutch. In FIG. 9, when the clutch is moved to the lowered position to engage with the rotor, the metal plate due to the movement of the clutch moves away from the magnetic force sensing device. Accordingly, the magnetic sensor senses the decrease of the magnetic force to sense the coupling between the clutch and the rotor.

In the above configuration, the metallic annular metal plate 43 capable of increasing the magnetic force is used to amplify the degree of increase or decrease of the magnetic force that can be detected by the magnetic sensor. Therefore, according to the above-described structure, the magnetic sensor senses the approach of the clutch with a much higher sensitivity than that of sensing the position by the distance from the general permanent magnet, and whether or not the clutch and the clutch stopper are engaged, It is possible to precisely prevent breakage and malfunction of the driving part of the washing machine in advance by sensing without malfunction by the embodiment. In addition, since the electric device for sensing is not used in the rotor and the shaft coupling portion 23 as the rotating body, the reliability of operation is further improved.

The present embodiment is for detecting whether or not the clutch is fully engaged with the rotor in the above-described configuration.

10, the fourth embodiment includes a shielding member 44 mounted on the clutch, permanent magnets 63c and magnetic sensors (not shown) at each end of the metallic connecting member 61c bent at both ends in the same direction 62c are coupled to each other and are spaced apart from each other by a predetermined distance.

The shielding member 44 is configured to be coupled to the upper portion of the clutch, as shown in Fig. An upper portion of the clutch is provided with an annular extending surface 31a extending outward from the center of the clutch so that an upper tooth surface 35 is formed. The shielding member 44 is coupled to the lower surface of the extended surface 31a so as to be concentric with the clutch. Accordingly, the shielding member can always be positioned below the extended surface without being affected by the rotation of the clutch.

The shielding member 44 has a ring-shaped coupling surface for coupling the cylindrical outer peripheral surface with the extended surface 31a. The outer circumferential surface of the shield member shields between the permanent magnet and the magnetic sensor due to the movement of the clutch so that the magnetic sensor senses the position of the clutch.

Meanwhile, the shielding member 44 preferably has a steel-based metal material. However, this means that the shielding member has a magnetizable material, and other magnetizable materials may be used. Accordingly, when the magnetic field is formed, the magnetic lines of force can be concentrated, thereby enabling shielding.

The magnetic force sensing device 60c includes a metallic connecting member 61c, a magnetic sensor 62c, and a permanent magnet 63c. The metallic connecting member is formed in a 'C' shape and has magnetic sensors and permanent magnets on the inner side of each end as shown in FIG. At this time, both end portions are formed to bend or face in the same direction. That is, the magnetic sensor and the permanent magnet are spaced apart from each other.

Here, the magnetic force sensing device 60c is located below the clutch. As shown in FIG. 10, the magnetic force sensing device is fixed to a cradle coupled to a clutch stopper. Wherein both ends of the connecting member are directed toward the clutch. More specifically, it is directed upward with the shield member coupled to the clutch. The shield member has a cylindrical outer circumferential surface and is coupled to the clutch so as to be concentric with the outer circumferential surface of the shield member when the clutch is lowered as the clutch is engaged with the rotor as shown in Fig.

Fig. 11 (a) shows the ascending position of the clutch. In Fig. 11 (a), the shielding member is away from the permanent magnet and the magnetic sensor, and does not shield between the permanent magnets and the magnetic sensor. FIG. 11 (b) shows the lowered position of the clutch. Generally, when a metallic member is placed around the magnet to magnetize it, the magnetic field of the magnet is concentrated on the metallic member. Therefore, when the outer circumferential surface of the shielding member 44 enters between the permanent magnet 63c and the magnetic sensor 62c, the magnetic force lines of the permanent magnets are concentrated on the metallic shielding member, so that the magnetic field does not affect the magnetic sensor. That is, the magnetic sensor senses the coupling between the clutch and the shaft coupling portion due to the disappearance of the magnetic field that affects the magnetic sensor.

The above-described embodiment of the present invention can completely shield the magnetic field sensed by the magnetic sensor 62c when the rotor and the clutch are engaged. In other words, it is much more accurate to sense the magnetic field completely than to detect the approach of the magnet. Accordingly, it is possible to precisely prevent breakage and malfunction of the driving part of the washing machine by sensing whether the rotor and the clutch are engaged with each other without malfunctioning according to the embodiment.

The present embodiment is for detecting whether or not the clutch is completely disengaged from the rotor in the above configuration. That is, it is sensed that the clutch 31 is fully engaged with the clutch stopper 32 to prevent movement.

12, the fifth embodiment includes a shielding member 44 mounted on the clutch, permanent magnets 63d and magnetic sensors 63d at each end of the metallic connecting member 61d whose both ends are bent in the same direction 62d are coupled to each other and are spaced apart from each other by a predetermined distance.

The shielding member 45 is configured to be coupled to the upper portion of the clutch, as shown in Fig. An upper portion of the clutch is provided with an annular extending surface 31a extending outward from the center of the clutch so that an upper tooth surface 35 is formed. The shielding member 45 is coupled to the lower surface of the extended surface 31a so as to be concentric with the clutch. Accordingly, the shielding member can always be positioned below the extended surface without being affected by the rotation of the clutch.

The shielding member 45 has ring-shaped coupling surfaces 45b and 45c extending from the outer peripheral surface 45a for coupling the cylindrical outer peripheral surface 45a and the extended surface 31a. Accordingly, the shielding member forms a receiving space by a connecting surface connected to the outer circumferential surface of the shielding member, and one end of the magnetic force sensing device is received in the receiving space, and the outer circumferential surface shields between the permanent magnet and the magnetic sensor . That is, the outer circumferential surface 45a of the shield member shields between the permanent magnet and the magnetic sensor due to the movement of the clutch, so that the magnetic sensor senses the position of the clutch.

The shielding member 45 preferably has a steel-based metal material. However, this means that the shielding member has a magnetizable material, and other magnetizable materials may be used. Accordingly, when the magnetic field is formed, the magnetic lines of force can be concentrated, thereby enabling shielding.

The magnetic force sensing device 60d includes a metallic connecting member 61d, a magnetic sensor 62d, and a permanent magnet 63d. The metallic connecting member is formed in a 'C' shape and has magnetic sensors and permanent magnets on the inner surface of each end as shown in FIG. At this time, both end portions are formed to bend or face in the same direction. That is, the magnetic sensor and the permanent magnet are spaced apart from each other.

Here, the magnetic force sensing device 60d is located on the upper side of the clutch 31. In other words, as shown in Fig. 12, it is coupled to the lower surface of the clutch stopper 32 located at the upper portion of the clutch. As shown in FIG. 12, the magnetic force sensing device is fixed to a cradle coupled to the clutch stopper 32. Wherein both ends of the connecting member face downward. More specifically, it faces downward with the outer peripheral surface 45d of the shield member coupled to the clutch. 12, the outer circumferential surface 45d of the shielding member 45d is engaged with the clutch stopper 32 when the clutch is engaged with the clutch stopper 32, And enters between the permanent magnet and the magnetic sensor.

Accordingly, at the time of the rise of the clutch, the magnetic force sensing device is located at the side of the stopper and senses that the clutch 31 and the stopper 32 are engaged.

Fig. 13 (a) shows the lowered position of the clutch. In Fig. 13 (a), the shielding member is away from the permanent magnet and the magnetic sensor, and does not shield between the permanent magnet and the magnetic sensor. 13 (b) shows the lifted position of the clutch. Generally, when a metallic member is placed around the magnet to magnetize it, the magnetic field of the magnet is concentrated on the metallic member. Therefore, when the outer peripheral surface 45d of the shielding member 45 enters between the permanent magnet 63d and the magnetic sensor 62d, the magnetic force lines of the permanent magnets are concentrated on the metallic shielding member so that the magnetic field does not affect the magnetic sensor . That is, the magnetic sensor detects the coupling between the clutch and the clutch stopper due to the disappearance of the magnetic field affecting the magnetic sensor.

Such an embodiment of the present invention can completely shield the magnetic field sensed by the magnetic sensor 62d when the clutch and the clutch stopper are engaged. In other words, it is much more accurate to sense the magnetic field completely than to detect the approach of the magnet. Accordingly, it is possible to precisely prevent breakage and malfunction of the driving part of the washing machine, by detecting the disengagement of the rotor and the clutch without any malfunction by the above embodiment.

While the preferred embodiments of the present invention have been described with reference to the accompanying drawings, it is to be understood that the scope of the present invention should not be construed as being limited to the embodiments and / or drawings, do. It is to be expressly understood that improvements, changes and modifications apparent to those skilled in the art are also within the scope of the present invention.

11: washing shaft 12: dehydrating shrinkage
21: rotor 22: stator
23: shaft coupling portion 31: clutch
32: clutch stopper 33: clutch lever
34: lower tooth surface of the clutch 35: upper tooth surface of the clutch
36: clutch drive motor 38: pressure spring
41: shielding member 42: permanent magnet
43: annular metal plate 44, 45: shielding member
50: magnetic sensor 51: cradle
60a, 60b, 60c, 60d: magnetic force sensing device
61a, 61b, 61c, 61d:
62a, 62b, 62c, 62d:
63a, 63b, 63c, 63d: permanent magnets
100: Bearing housing 110: Bearing

Claims (15)

A washing shaft for rotating the laundry blade;
Dehydrating shrinkage for rotating the drum located inside the water tank;
A rotor coupled to the washing shaft and transmitting a rotational force;
A clutch selectively engaging with the rotor by up and down movement to selectively transmit rotational force of the rotor to the dehydrating shafts;
A shielding member mounted on the clutch;
A permanent magnet provided on the rotor;
And a magnetic sensor facing the permanent magnet,
The shielding member shields the permanent magnet and the magnetic sensor by movement of the clutch, and the magnetic sensor senses the position of the clutch.
The method according to claim 1,
Wherein the permanent magnet has a ring shape and is coupled to be concentric with the rotor,
Wherein the shield member has a cylindrical shape and is coupled concentrically to the clutch,
Wherein an inner diameter of said cylindrical shielding member is formed to be larger than an outer diameter of said ring-shaped permanent magnet, and said shielding member surrounds an outer peripheral surface of said permanent magnet by movement of said clutch.
3. The method of claim 2,
Wherein the cylindrical shield member enters and intercepts between the permanent magnet and the magnetic sensor which are opposed to each other by the movement of the clutch.
3. The method of claim 2,
Wherein the magnetic sensor is spaced apart from the outer circumferential surface of the permanent magnet so as to have a predetermined gap therebetween so as to face the permanent magnet.
3. The method according to claim 1 or 2,
Wherein the shielding member has a steel-based metal material.
A washing shaft for rotating the laundry blade;
Dehydrating shrinkage for rotating the drum located inside the water tank;
A rotor coupled to the washing shaft to transmit rotational force;
A clutch selectively engaging with the rotor by up and down movement to selectively transmit rotational force of the rotor to the dehydrating shafts;
An annular metal plate mounted concentrically with the clutch on the clutch; And
A permanent magnet and a magnetic sensor are respectively coupled to the respective ends of the metallic connection member whose both ends are bent in the same direction and are spaced apart from each other by a predetermined distance on one side of the metal plate, A magnetic force sensing device,
Wherein the magnetic sensor senses an increase in magnetic force between both ends of the connection member by sensing the position of the clutch by the metal plate approaching the magnetic force sensing device due to the movement of the clutch.
The method according to claim 6,
Wherein the magnetic force sensing device is located below the clutch so that the clutch senses a clutch fall associated with the rotor.
The method according to claim 6,
Wherein the magnetic force sensing device is located on a side surface of the metal plate at the time of rising of the clutch so that the clutch senses a rise of the clutch to be disengaged from the rotor.
9. The method of claim 8,
Further comprising a stopper on an upper portion of the clutch to prevent movement of the clutch upon clutching,
Wherein the magnetic force sensing device is coupled to a side surface of the stopper, and detects that the clutch and the stopper are engaged.
A washing shaft for rotating the laundry blade;
Dehydrating shrinkage for rotating the drum located inside the water tank;
A rotor coupled to the washing shaft and transmitting a rotational force;
A clutch selectively engaging with the rotor by up and down movement to selectively transmit rotational force of the rotor to the dehydrating shafts;
A shielding member mounted on the clutch;
And a magnetic force sensing device in which permanent magnets and magnetic sensors are respectively coupled to respective end portions of the metallic connection members whose both ends are bent in the same direction and are spaced apart by a predetermined distance,
The shielding member shields between the permanent magnet and the magnetic sensor by movement of the clutch, and the magnetic sensor senses the position of the clutch.
11. The method of claim 10,
Wherein the shielding member has a steel-based metallic material.
11. The method of claim 10,
Wherein the magnetic force sensing device is located at a lower portion of the clutch and both end portions of the connecting member face the clutch side,
Wherein the shield member has a cylindrical shape and is coupled concentrically to the clutch,
Wherein an outer circumferential surface of the shield member enters between the permanent magnet and the magnetic sensor when the clutch is lowered when the clutch is engaged with the rotor,
washer.
11. The method of claim 10,
Wherein the magnetic force sensing device is located at an upper portion of the clutch and both end portions of the connecting member face the clutch side,
Wherein the shield member has a cylindrical shape and is coupled concentrically to the clutch,
Wherein an outer circumferential surface of the shield member enters between the permanent magnet and the magnetic sensor when the clutch is lifted when the clutch is disengaged from the rotor,
washer.
14. The method of claim 13,
Further comprising a stopper on an upper portion of the clutch to prevent movement of the clutch upon clutching,
Wherein the magnetic force sensing device is coupled to a side surface of the stopper, and detects that the clutch and the stopper are engaged.
15. The method of claim 14,
Wherein the shielding member includes a connecting surface connected to an outer circumferential surface of the shielding member to form a receiving space,
Wherein one end of the magnetic force sensing device is accommodated in the accommodating space so as to be spaced apart from the accommodating space, and the outer circumferential surface shields between the permanent magnet and the magnetic sensor.

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