JP5349424B2 - Washing machine - Google Patents

Description

  Embodiments described herein relate generally to a washing machine.

  In a washing machine, for example, a drum-type washing machine, a water tank having a drum disposed therein and a damper (suspension) for supporting the water tank in an anti-vibration manner are provided in the outer box. Vibration is reduced by the damper. In order to improve the vibration isolation performance, a damper using a magnetorheological fluid (MR fluid) whose viscosity changes with a change in magnetic field is considered. In this device, for example, a coil for generating a magnetic field is provided in a cylinder, and a shaft penetrating the coil in the axial direction is provided so as to be able to reciprocate, and a magnetorheological fluid is provided between the shaft and the coil. It has a configuration provided.

JP 2010-104578 A

  By the way, in the thing of the above-mentioned composition, when water infiltrates in an outer case (inside a washing machine), or moisture in the outer case becomes high and dew condensation occurs, for example, a coil Water may enter the cylinder from the lead wire outlet through which the lead wire is drawn out, and the electrical insulation between the coil and the cylinder may be reduced.

  Therefore, a washing machine is provided that can prevent a decrease in electrical insulation between a coil and a cylinder in a damper.

The washing machine of the present embodiment is a washing machine provided with a damper that supports the water tank in a vibration-proof manner. The damper includes a cylinder having a lead wire outlet, a coil that generates a magnetic field, and a yoke that induces the magnetic field of the coil. A molded coil unit formed by molding with resin and accommodated in the cylinder and formed with a through hole extending in the axial direction; a shaft inserted into the through hole so as to be reciprocally movable; the shaft and the yoke; A magnetorheological fluid that is filled in the gap between the two and has a viscosity that changes with a change in the magnetic field, a bush that has a lead wire insertion hole and is fitted to the lead wire outlet, and is derived from the mold coil unit. A lead wire of the coil drawn out of the cylinder through the lead wire insertion hole of the bush . In the molded coil unit, the lead-out portion of the lead wire was waterproofed with a moisture-proof material.

Vertical sectional view of the suspension in this embodiment Enlarged longitudinal section of the main part External perspective view of suspension External perspective view of molded coil unit Longitudinal section of molded coil unit Front view of middle yoke The perspective view which shows the arrangement | positioning relationship between the intermediate yoke and the lead wire of a coil before molding Longitudinal side view showing schematic configuration of drum type washing machine

  Hereinafter, an embodiment applied to a drum type washing machine will be described with reference to the drawings. First, in FIG. 8 showing a schematic configuration of a drum type washing machine, a laundry doorway 2 is formed at a substantially central portion of the front portion (right side in FIG. 8) of the outer box 1 forming the outer shell of the washing machine. And a door 3 for opening and closing the laundry doorway 2 is provided. An operation panel 4 is provided at the upper portion of the front portion of the outer box 1, and a control device 5 for operation control is provided on the back side (inside the outer box 1).

  A water tank 6 is disposed inside the outer box 1. This water tank 6 has a horizontal cylindrical shape with the axial direction as front and rear (right and left in FIG. 8), and is tilted forward by a pair of left and right suspensions (only one shown) on the bottom plate 1a of the outer box 1. Elastically supported in the state. The detailed structure of the suspension 7 will be described later. A motor 8 is attached to the back surface of the water tank 6. The motor 8 is composed of, for example, a direct current brushless motor and is of an outer rotor type. A rotating shaft (not shown) attached to the center of the rotor 8 a is inserted into the water tank 6 through a bearing bracket 9. ing.

  A drum 10 is disposed inside the water tank 6. This drum 10 also has a horizontal cylindrical shape in the front-rear direction. By connecting the central part of the rear part thereof to the tip part of the rotating shaft of the motor 8, the drum 10 is inclined upward and coaxial with the water tank 6. Supported by the state. As a result, the drum 10 is directly rotated by the motor 8. Therefore, the drum 10 is a rotating tank, and the motor 8 functions as a drum driving device that rotates the drum 10.

  A large number of small holes 11 through which water and air can be passed are formed in the peripheral side portion (body portion) of the drum 10. In contrast, the water tank 6 is basically non-porous and has a structure capable of storing water. Both the drum 10 and the water tub 6 have openings 12 and 13 on the front surface, and an annular bellows 14 is mounted between the opening 13 of the water tub 6 and the laundry entrance 2. Yes. Thereby, the laundry doorway 2 has a form that continues to the inside of the drum 10 via the bellows 14, the opening 13 of the water tub 6, and the opening 12 of the drum 10.

  A drain pipe 16 is connected to the lowest part of the water tank 6 capable of storing water through a drain valve 15 on the way, and the water in the water tank 6 can be discharged out of the machine through the drain pipe 16. A drying device 17 is disposed from the back side of the water tank 6 to the upper side and the front side. The drying device 17 includes a dehumidifier 18, a blower 19, a heater 20, and a circulation duct 21, and removes moisture in the air discharged from the water tank 6 (inside the drum 10) in the dehumidifier 18. Then, the air is heated by the heater 20 to generate dry air, and the laundry stored in the drum 10 is repeatedly circulated by returning the dry air to the water tank 6 (in the drum 10). Is supposed to dry.

  Next, the structure of the suspension 7 will be described with reference to FIGS. As shown in FIGS. 1 and 3, the suspension 7 includes a damper 23 and a coil spring 24 including a compression coil spring. Among these, the damper 23 includes a cylindrical cylinder 25 extending in the vertical direction and a shaft 26 extending in the vertical direction along the cylinder 25, and the lower portion of the shaft 26 reciprocates in the cylinder 25 in the vertical direction. Inserted as possible.

  A connecting member 28 is provided at the lower end which is one end of the cylinder 25 in the axial direction. The connecting member 28 integrally includes a lid portion 28a and a connecting shaft portion 28b protruding downward from the lid portion 28a, and the lid portion 28a is fitted into the lower end opening of the cylinder 25. The outer peripheral portion of the lid portion 28 a is fixed to the cylinder 25 by welding (TIG welding) to the inner peripheral portion of the cylinder 25. The connecting shaft portion 28b of the connecting member 28 is fastened to the mounting member 29 (see FIG. 8) fixed to the bottom plate 1a of the outer box 1 with a nut 31 via an elastic seat plate 30 such as rubber, etc. 25 is connected to a mounting member 29 on the bottom plate 1a side.

  An upper connecting member 32 is connected to the upper end of the shaft 26. The connecting shaft portion 32a of the upper connecting member 32 is fastened to the mounting member 33 (see FIG. 8) of the water tank 6 with a nut 35 via an elastic seat plate 34 such as rubber, like the connecting shaft portion 28b. Thus, the shaft 26 is connected to the mounting member 33 on the water tank 6 side. A spring receiving seat 36 is fitted and fixed to the lower end portion of the upper connecting member 32, and the coil spring 24 is mounted between the spring receiving seat 36 and the upper end portion of the cylinder 25 so as to surround the shaft 26. Has been.

  An annular lower bearing case 38 is accommodated in the middle portion of the cylinder 25 in the vertical direction. A groove portion 39 extending in the circumferential direction is formed on the outer peripheral portion of the lower bearing case 38, and a portion corresponding to the groove portion 39 in the peripheral wall portion of the cylinder 25 is caulked inward to thereby lower the lower bearing case 38. Is fixed in the cylinder 25. The caulked portion is a caulking portion 40. A groove 39a (see FIG. 1) opened in the axial direction is formed at one place on the outer peripheral portion of the lower bearing case 38. An annular bearing 41 that supports the shaft 26 so as to reciprocate in the axial direction (vertical direction) is housed and fixed to the inner peripheral portion of the lower bearing case 38. The bearing 41 is made of, for example, sintered oil-impregnated metal. A retaining member 26 a is attached to the lower end of the shaft 26, and the retaining member 26 a abuts against the lower surface of the lower bearing case 38, so that the upward movement of the shaft 26 is restricted.

  In the cylinder 25, an annular upper bearing case 42 is also housed inside the upper end which is the other end in the axial direction. The upper bearing case 42 has a cylindrical part 42b having an outer diameter smaller than that of the lower part 42a at the upper part thereof, and a step part 42c is formed between the lower part 42a and the cylindrical part 42b. The cylinder portion 42b protrudes upward from the cylinder 25. As shown in FIG. 2, a groove portion 43 is formed on the outer peripheral portion of the lower portion 42 a in the upper bearing case 42, and a portion corresponding to the groove portion 43 in the peripheral wall portion of the cylinder 25 is inward. The upper bearing case 42 is fixed to the upper end of the cylinder 25 by caulking. The caulked portion is a caulking portion 44. In this case, the caulking portion 44 is provided on the entire circumference by rolling caulking. An O-ring 45 is attached to the groove 43, and the O-ring 45 is sandwiched and pressed between the groove 43 of the upper bearing case 42 and the caulking portion 44 of the cylinder 25.

  The lower end of the coil spring 24 is received by a step 42 c of the upper bearing case 42. An annular bearing 46 that supports the shaft 26 so as to reciprocate in the axial direction (vertical direction) is housed and fixed at an upper portion of the inner peripheral portion of the upper bearing case 42. The bearing 46 is also made of, for example, sintered oil-impregnated metal, like the lower bearing 41. In the inner peripheral portion of the upper bearing case 42, an annular friction member 47 is accommodated in a press-fit state below the bearing 46, and the inner peripheral portion of the friction member 47 slides on the outer peripheral surface of the shaft 26. It is in pressure contact.

  A molded coil unit 50 is accommodated in a portion of the cylinder 25 between the lower bearing case 38 and the upper bearing case 42. The molded coil unit 50 is fixed while being sandwiched between the lower bearing case 38 and the upper bearing case 42. The molded coil unit 50 includes a lower yoke 51, a first bobbin 53 around which a first coil 52 is wound, an intermediate yoke 54, and a second coil, as shown in FIGS. A second bobbin 56 wound with 55, an upper yoke 57, and a molding resin 58 for integrating them are provided. As the resin 58, for example, a thermoplastic resin (nylon, PBT, PET, PP, or the like) is used. An annular seal member 59 is mounted in a press-fit state on the lower yoke 51 and the upper yoke 57 which are both ends in the axial direction of the mold coil unit 50. These seal members 59 are the same as the friction member 47, and the inner peripheral portion is slidably pressed against the outer peripheral surface of the shaft 26.

  The mold coil unit 50 has a through hole 61 penetrating in the axial direction at the center, and has a cylindrical shape as a whole, and the shaft 26 is inserted into the through hole 61 so as to be capable of reciprocating in the axial direction. . A groove 62 extending in the axial direction is formed on the outer peripheral portion of the mold coil unit 50, and a circular recess 63 is provided in the groove 62 at a position corresponding to the intermediate yoke 54, and the recess 63. A rectangular concave portion 64 is formed continuously in the circumferential direction. Two lead wires 65 of the first coil 52 and the second coil 55 are led out from the rectangular recess 64 among them. As shown in FIG. 5, the base end portion of each lead wire 65 passes through the end plate of the corresponding bobbin 53, 56 and is connected to the end portion of each coil 52, 55, and is covered with resin 58. Yes. Each lead wire 65 is covered with a resin tube 65a around the conducting wire.

  Here, as shown in FIGS. 6 and 7, the intermediate yoke 54 has a groove 68 having a lead wire arranging groove 66 and a crossover arranging groove 67 at one place on the outer peripheral portion. The lead wire placement groove 66 and the crossover wire placement groove 67 are opened in the axial direction of the intermediate yoke 54. An injection port 69 formed of a circular screw hole is formed at the center of the groove 68, and a cylindrical screw 70 (see FIG. 4) having a hexagonal recess 70a on the end surface is attached to the injection port 69. Yes. The inlet 69 is for injecting a magnetorheological fluid, which will be described later. As shown in FIG. 6, groove portions 71 narrower than the groove portion 68 are formed at three locations on the outer peripheral portion of the intermediate yoke 54. A plurality of positioning holes 72 for positioning the first and second bobbins 53 and 56 are formed in the intermediate yoke 54.

  The first coil 52 and the second coil 55 are connected in series by a crossover 73 (see FIG. 7). One lead wire 65 connected to the first coil 52 and one lead wire 65 connected to the second coil 55 are led out from the molded coil unit 50 as follows. . In this case, the lead wire guide member 74 shown in FIG. 7 is used. The lead wire guide member 74 is made of a synthetic resin, has a U-shaped cross section with one end opened, and has two holes 75 and a partition portion 76 so as to partition the holes 75. With the two lead wires 65 inserted into the holes 75 of the lead wire guide member 74 and bent in an L shape, the lead wire guide member 74 is placed in the lead wire placement groove 66 of the intermediate yoke 54. In addition, in the state where the crossover wire 73 is arranged in the crossover wire arrangement groove 67, the lead wire arrangement groove 66 and the crossover wire arrangement groove 67 are also filled with the resin 58. The resin 58 is also filled in the lead wire guide member 74 (see FIG. 5).

  As shown in FIG. 4, the two lead wires 65 are led out of the molded coil unit 50 from the recessed portion 64 with the base end portion covered with the resin 58. Resin 58 is also filled in the other groove portion 71 of the intermediate yoke 54. Portions other than the groove portions 68 and 71 in the outer peripheral portion of the intermediate yoke 54 are exposed from the resin 58. In the molded coil unit 50, a moisture-proof material 77 (see FIGS. 1, 2, 4, and 5) made of, for example, silicone is potted in a recess 64 that is a lead-out portion of two lead wires 65. 77 is filled up to the inside of the lead wire guide member 74 and fills the entire inside of the concave portion 64, so that the lead wire 56 is waterproofed while being stabilized against an external force.

  Here, the inner diameter dimension of the through hole 61 of the molded coil unit 50 will be described. As shown in FIG. 5, the inner diameters of the three yokes 51, 54, and 57 at the lower part, the middle part, and the upper part are set to the same dimension. A gap 78 is formed. The inner diameters of the first and second bobbins 53 and 56 are set to the same size, and are set slightly larger than the inner diameters of the three yokes 51, 54 and 57, and the outer circumference of the shaft 26 is set. For example, a gap 79 of about 1.0 mm is formed between the surface and the surface.

A clearance 78 between the outer peripheral surface of the shaft 26 and the inner peripheral surfaces of the three yokes 51, 54, 57, and the outer peripheral surface of the shaft 26 and the inner peripheral surfaces of the two bobbins 53, 56 A magnetorheological fluid 80 is injected into the gap 79 therebetween. The magnetorheological fluid 80 is injected to the inside of the upper and lower seal members 59. The magnetorheological fluid 80 is injected from the injection port 69 of the mold coil unit 50, and the injection port 69 is closed by a screw 70.
For example, the magnetorheological fluid 80 is obtained by dispersing ferromagnetic particles such as iron and carbonyl iron in oil. When a magnetic field is applied, the magnetorheological fluid 80 appears to form a chain cluster. It has a characteristic of increasing the viscosity of.

  In this case, the lower and upper seal members 59 of the molded coil unit 50 and the friction member 47 of the upper bearing case 42 are generated between the action of preventing the magnetic viscous fluid 80 from leaking to the outside and the shaft 26. Demonstrates the action of a friction damper using friction. Further, as shown in FIG. 5, between the lower yoke 51 and the first bobbin 53, between the first bobbin 53 and the intermediate yoke 54, between the intermediate yoke 54 and the second bobbin 56, In addition, an O-ring 81 for sealing is provided between the second bobbin 56 and the upper yoke 57. These O-rings 81 also have a function of preventing the magnetorheological fluid 80 from leaking outside.

  A lead wire outlet 82 (see FIG. 1 and FIG. 2) made of a circular hole is formed at an intermediate portion in the axial direction of the peripheral wall portion of the cylinder 25 at a position corresponding to the circular recess 63. Yes. The lead wire outlet 82 is fitted with a bush 83 having a lead wire insertion hole 83 a, and the two lead wires 56 are drawn out through the lead wire insertion hole 83 a of the bush 83. . In this case, the bush 83 is made of a resin such as nylon.

On the outer peripheral portion of the cylinder 25, a mountain-shaped flange portion 84 is provided above the bush 83 (above the lead wire outlet 82). In this case, the flange portion 84 is bonded to the outer surface of the cylinder 25 with an adhesive. The flange 84 prevents water from above from entering the cylinder 25 from the lead wire outlet 82 (lead wire insertion hole 83a).
Further, a wiring fixing member 85 (see FIG. 3) is attached to the outer peripheral portion of the cylinder 25, and a lead wire drawn out of the cylinder 25 by a wiring holder 86 provided on the wiring fixing member 85. 65 is held. A space 88 (see FIG. 1) is formed between the lid portion 28a of the connecting member 28 and the lower bearing case 38 in the cylinder 25.

  Next, a procedure for assembling the suspension 7 having the above-described configuration will be described. In advance, the lid portion 28a of the connecting member 28 is fixed to one end portion of the cylinder 25 opened at both ends in the axial direction by welding. At a position different from the cylinder 25, the lower bearing case 38 housing the bearing 41 on the outer periphery of the shaft 26, the mold coil unit 50 having the seal members 59 mounted on both ends in the axial direction, the friction member 47, and the bearing The upper bearing case 42 that accommodates 46 is fitted and assembled, and a retaining member 26a is attached to the tip of the shaft 26 to position them. At this time, the position of the groove portion 39 a opened in the axial direction in the outer peripheral portion of the lower bearing case 38 and the position of the groove portion 62 extending in the axial direction in the outer peripheral portion of the molded coil unit 50 are aligned. An O-ring 45 is attached to the groove 43 on the outer peripheral portion of the upper bearing case 42.

Next, the magnetorheological fluid 80 is injected from the inlet 69. The magnetorheological fluid 80 is injected into the gaps 78 and 79 between the outer peripheral surface of the shaft 26 and the inner peripheral surface of the mold coil unit 50, and is also injected inside the upper and lower seal members 59. After the injection, a screw 70 is attached to the injection port 69 and the injection port 69 is closed.
Next, the leading end portion of the lead wire 65 led out from the mold coil unit 50 is inserted from the upper end opening of the cylinder 25, and the leading end portion of the lead wire 65 is attached to the cylinder 25 using a hooking tool (not shown). The lead wire is drawn out from the lead wire outlet 82 to the outside of the cylinder 25. At this time, the bush 83 is not attached to the lead wire outlet 82.

  Next, the lead wire 65 is disposed in the groove portion 39a of the lower bearing case 38 and the groove portion 62 of the molded coil unit 50, and the lead wire 65 does not protrude from the outer peripheral surfaces of the lower bearing case 38 and the molded coil unit 50. 4 (see FIG. 4), the lower bearing case 38, the molded coil unit 50, and the upper bearing case 42 assembled to the shaft 26 are inserted into the cylinder 25 together with the shaft 26 from the upper end opening of the cylinder 25. With the insertion into the cylinder 25, the lead wire 65 is gradually pulled out.

  Next, in a state where the upper bearing case 42 is positioned with respect to the cylinder 25, a caulking portion 44 is formed by rolling caulking a portion corresponding to the groove portion 43 of the upper bearing case 42 in the outer peripheral portion on the upper end portion side of the cylinder 25. The upper bearing case 42 is fixed to the upper portion of the cylinder 25. Next, a caulking portion 40 is provided by caulking a portion corresponding to the groove 39 in the outer peripheral portion of the lower bearing case 38 in the outer peripheral portion of the intermediate portion in the axial direction of the cylinder 25, and the lower bearing case 38 is attached to the cylinder 25. Secure to the middle part.

  Next, the lead wire 65 is led out from the lead wire outlet 82 of the cylinder 25 using a device (not shown) such as an injection needle in a state where the cylinder 25 and the shaft 26 are in the horizontal direction (substantially horizontal state). A slightly fluid moisture-proof material 77 is potted in the rectangular concave portion 64, which is a portion, and the lead-out portion of the lead wire 65 is covered with the moisture-proof material 77 (see FIG. 4). As the moisture-proof material 77, for example, silicone is used. At this time, it is preferable that the rectangular concave portion 64 is on the lower side so that the moisture-proof material 77 does not flow out of the concave portion 64, for example, the circular concave portion 63 or the groove portion 62. The moisture-proof material 77 is cured by leaving it in this state to make it waterproof.

Next, outside the cylinder 25, the two lead wires 65 drawn out of the cylinder 25 are inserted into the lead wire insertion holes 83 a of the bush 83, and the bush 83 is inserted into the outer periphery of the two lead wires 65. The bush 83 is fitted and moved to the cylinder 25 side, and the bush 83 is fitted to the lead wire outlet 82 of the cylinder 25 (see FIGS. 1 to 3).
Next, the coil spring 24 is disposed at the upper end portion of the cylinder 25 so as to surround the upper portion of the shaft 26, and the spring receiving seat 36 and the upper connecting member 32 are fitted and fixed to the upper end portion of the shaft 26. As a result, the coil spring 24 is compressed between the upper bearing case 42 at the upper end of the cylinder 25 and the spring seat 36. Further, the wiring fixing member 85 is mounted on the outer peripheral portion of the cylinder 25 and the lead wire 65 is held by the wiring holder 86. Thereby, the assembly of the suspension 7 is completed.

  The suspension 7 assembled in this way is disposed on both the left and right sides of the water tank 6. The lead wires 65 led out from the suspensions 7 are connected to a drive circuit (not shown). The first and second coils 52 and 55 are controlled to be turned off and on by the control device 5 via a drive circuit.

In the above configuration, the operation of the suspension 7 described above related to the washing operation will be described. First, consider a state in which the first and second coils 52 and 55 are not energized.
As the drum 10 is rotationally driven in the washing process, the dehydration process, and the drying process, the water tank 6 vibrates mainly in the vertical direction. In response to the vertical vibrations of the water tank 6, the suspension 7 moves up and down while the shaft 26 connected to the water tank 6 side extends and retracts the coil spring 24 relative to the cylinder 25 fixed to the bottom plate 1 a side of the outer box 1. Move. At this time, in addition to the vibration reducing action by the coil spring 24, the friction member 47 and the seal member 59 always apply a damping force to the shaft 26 with a frictional resistance, and the shaft 26 and the three yokes 51, 54, 57 and the magnetorheological fluid 80 filled between the two bobbins 53 and 56 causes a damping force to act on the frictional resistance due to the viscosity, and attenuates the amplitude of the water tank 6.

  Here, the first and second coils 52 and 55 are energized when the vibration of the water tank 6 is further increased, for example, when the rotation speed of the drum 10 is a resonance rotation speed (about 100 to 300 rpm). It is like that. The energization condition is not limited to the rotation speed, and the energization may be performed when the vibration of the water tank 6 is detected by the vibration detecting means and the vibration becomes larger than the set value.

When the first and second coils 52 and 55 are energized based on the fact that the energization condition is satisfied, a magnetic field is applied to the magnetorheological fluid 80, particularly via the yokes 51, 54 and 57, The viscosity of the magnetorheological fluid 80 increases. Thereby, it increases so that frictional resistance may become large. Thus, the damping force is increased by further increasing the frictional resistance with respect to the shaft 26 as compared with the case described above (when the first and second coils 52 and 55 are not energized). Therefore, the vibration of the water tank 6 can be effectively damped.
The first and second coils 52 and 55 generate a magnetic field according to the value of the flowing current and control the viscosity of the magnetorheological fluid 80. The generated magnetic field is variable depending on the current value. The viscosity of the magnetorheological fluid 80 can be variably controlled.

  On the other hand, let us consider a case in which water enters the outer box 1 or condensation occurs in the outer box 1 in the above configuration. In the suspension 7, the lid portion 28 a of the connecting member 28 is fitted and welded to the lower end opening portion of the cylinder 25, so that water can be prevented from entering the cylinder 25 from the lower end portion of the cylinder 25. Further, an upper bearing case 42 is fitted into the upper end opening of the cylinder 25, a caulking portion 44 is provided over the entire circumference, and an O-ring 45 is provided between the cylinder 25 and the upper bearing case 42. Therefore, it is possible to prevent water from entering the cylinder 25 from the upper end portion of the cylinder 25.

  And since the bush 83 is fitted and attached to the lead wire outlet 82 in the peripheral wall portion of the cylinder 25, it is assumed that water enters the cylinder 25 from the outside of the cylinder 25 through the lead wire outlet 82. It can be prevented as much as possible. Further, since the flange portion 84 is provided on the outer peripheral portion of the cylinder 25 so as to be positioned above the bush 83, the water traveling along the outer peripheral surface of the cylinder 25 enters the cylinder 25 through the lead wire outlet 82. Can be prevented as much as possible.

  Here, even if the bush 83 is attached to the lead wire outlet 82, water outside the cylinder 25 can flow through the gap between the bush 83 and the lead wire outlet 82 or the lead wire insertion hole 83 a of the bush 83. It is conceivable to enter the cylinder 25. When water enters the cylinder 25 in this way, the water enters the coils 52 and 55 wound around the bobbins 53 and 56 through a minute gap between the outer peripheral surface of the lead wire 65 and the resin 58, and the coil There is a possibility that the connecting portion between the end portions of 52 and 55 and the base end portion of the lead wire 65 and the intermediate yoke 54 in particular are electrically connected via water. Further, the intermediate yoke 54 is in contact with the cylinder 25 and is electrically connected to most metal parts constituting the damper 23. For this reason, when water enters the lead wire 65 and the ends of the coils 52 and 55 through the lead wire 65, the lead wire 65 and the surface of the damper 23 (cylinder 25) are electrically connected to each other. There is a possibility that the electrical insulation between 52 and 55 and the cylinder 25 may be remarkably lowered.

  In this regard, in the above-described embodiment, the recess 64, which is the lead-out portion of the lead wire 65 of the coil 52, 55 in the molded coil unit 50, is subjected to waterproof treatment with the moisture-proof material 77, so that water is temporarily passed through the bush 83. Even if the water enters the cylinder 25, the water can be prevented from entering the connecting portion between the proximal end portion of the lead wire 65 and the end portions of the coils 52 and 55. It is possible to prevent a decrease in the electrical insulation property, and to prevent an electric shock accident.

According to the above-described embodiment, the following operational effects can be obtained.
Of the portions where the lead wires 65 of the coils 52 and 55 pass through the lead wire outlet 82 of the cylinder 25 from the mold coil unit 50, the moisture resistance is provided in the recess 64 in the mold coil unit 50 and serving as the lead-out portion of the lead wire 65. Waterproofing with material 77 was performed. With this configuration, even if water enters the cylinder 25 through the bush 83, the water can be prevented from entering the connection portion between the proximal end portion of the lead wire 65 and the end portions of the coils 52 and 55. It can prevent that the electrical insulation between the coils 52 and 55 and the cylinder 25 falls.

As in the present embodiment, since the waterproof treatment with the moisture-proof material 77 is performed on the lead-out portion of the lead wire 65 in the molded coil unit 50, the moisture-proof material 77 is not exposed to the outside of the cylinder 25, and The load due to vibration is difficult to concentrate in the vicinity of the moisture-proof material 77, which is advantageous for vibration.

Since the moisture-proof material 77 is provided by potting in the recessed portion 64 provided around the lead-out portion of the lead wire 65 in the molded coil unit 50, the moisture-proof material 77 can be prevented from protruding and can be prevented from getting in the way. .
A bush 83 is fitted to the lead wire outlet 82 of the cylinder 25, and the lead wire 65 is configured to be pulled out through the lead wire insertion hole 83 a of the bush 83. According to this configuration, by providing the bush 83 at the lead wire outlet 82, water can hardly enter the cylinder 25 from the lead wire outlet 82 as compared to the case where no bush is provided. Further, since the bush 83 is made of resin, there are advantages that the rigidity is high, the attachment strength can be increased, the moldability is good, and the bush 83 can be manufactured at low cost.

Since the flange portion 84 is provided on the outer peripheral portion of the cylinder 25 so as to be positioned above the bush 83, it is as much as possible that water traveling on the outer peripheral surface of the cylinder 25 enters the cylinder 25 through the lead wire outlet 82. Can be prevented.
Since the connecting member 28 is provided at the lower end portion which is one end portion of the cylinder 25 in the axial direction, the cylinder 25 and the lid portion 28a of the connecting member 28 are fixed by welding, so that water enters the cylinder 25 from the lower portion of the cylinder 25. Can be surely prevented.

  A bearing 46 that supports the shaft 26 so as to be able to reciprocate is disposed at an upper end portion that is the other end portion in the axial direction of the cylinder 25, and an upper bearing case 42 that supports the bearing 46 is fitted and disposed. The bearing case 42 was fixed by rolling caulking. Accordingly, the caulking portion 44 can be provided over the entire outer periphery of the upper end portion of the cylinder 25, so that water enters the cylinder 25 from the joint portion between the upper end portion of the cylinder 25 and the upper bearing case 42. Can be prevented. In addition, since the O-ring 45 is provided between the cylinder 25 and the outer peripheral portion of the upper bearing case 42, water can be further prevented from entering the cylinder 25 from the upper part of the cylinder 25.

(Other embodiments)
The bush 83 fitted and attached to the lead wire outlet 82 of the cylinder 25 can be made of rubber instead of resin. When the bush 83 is made of rubber, it is possible to prevent the load applied to the lead wire 56 from being concentrated as much as possible during vibration, which is advantageous for vibration. In addition, there is an advantage that adhesion to the lead wire outlet 82 can be improved.

In the molded coil unit 50, the number of coils may be one or three or more, and the number of yokes may be two or more.
The embodiment of the washing machine is not limited to the drum-type washing machine, and a so-called vertical washing machine having a rotating tub inside a vertical water tub and a stirring body in the rotating tub may be used.

As described above, according to the present embodiment, in the molded coil unit housed in the cylinder, the lead wire lead-out portion is subjected to waterproof treatment with a moisture-proof material, so that electrical insulation between the coil and the cylinder is achieved. Can be prevented from decreasing.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 1 is an outer box, 6 is a water tank, 7 is a suspension, 8 is a motor, 10 is a drum (rotary tank), 23 is a damper, 24 is a coil spring, 25 is a cylinder, 26 is a shaft, 28 is a connecting member, 32 is an upper connecting member, 38 is a lower bearing case, 41 is a bearing, 42 is an upper bearing case (bearing case), 43 is a groove portion, 44 is a caulking portion, 45 is an O-ring, 46 is a bearing, 47 is a friction member, 50 Is a molded coil unit, 51 is a lower yoke, 52 is a first coil, 53 is a first bobbin, 54 is an intermediate yoke, 55 is a second coil, 56 is a second bobbin, 57 is an upper yoke, 58 Is a resin, 59 is a sealing member, 61 is a through hole, 64 is a recess, 65 is a lead wire, 77 is a moisture-proof material, 80 is a magnetorheological fluid, 82 is a lead wire outlet, 83 is a bush, 83a is a lead wire insertion hole 84 It shows the part.

Claims (6)

In a washing machine equipped with a damper for vibration-proofing the aquarium,
The damper is
A cylinder having a lead wire outlet;
A molded coil unit that is configured by molding a coil that generates a magnetic field and a yoke that induces the magnetic field of the coil with a resin, is accommodated in the cylinder, and has a through-hole extending in the axial direction;
A shaft inserted into the through hole so as to be reciprocally movable;
A magnetorheological fluid filled in a gap between the shaft and the yoke and having a viscosity that changes with a change in the magnetic field;
A bush having a lead wire insertion hole and fitted to the lead wire outlet;
A lead wire of the coil led out from the molded coil unit and led out of the cylinder through the lead wire insertion hole of the bush ,
A washing machine, wherein the lead-out portion of the molded coil unit is waterproofed with a moisture-proof material. The washing machine according to claim 1, wherein the molded coil unit is provided with a recess around the lead-out portion of the lead wire, and the moisture-proof material is potted in the recess . The washing machine according to claim 1 or 2, wherein a connecting member is provided at one end of the cylinder in the axial direction, and the cylinder and the connecting member are fixed by welding . The washing machine according to any one of claims 1 to 3, wherein the bush is made of resin . The washing machine according to any one of claims 1 to 3, wherein the bush is made of rubber . The washing machine according to any one of claims 1 to 5, wherein a flange portion is provided at an outer peripheral portion of the cylinder and above the lead wire outlet .

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