JP5127894B2 - Damper for washing machine - Google Patents

Description

  Embodiments described herein relate generally to a damper for a washing machine.

  Conventionally, in a drum type washing machine, a suspension that supports a water tank on a bottom plate of an outer box is provided with a damper that absorbs vibrations of a drum that accommodates laundry inside the water tank and rotates, and thus vibrations of the water tank. ing. As this type of damper, one using a magnetorheological fluid (MR fluid) whose viscosity changes depending on the strength of a magnetic field is known as a working fluid (see, for example, Patent Documents 1, 2, and 3).

  Here, a damper using a magnetorheological fluid targeted by the present invention includes a cylinder, and includes a bobbin around which a coil for generating a magnetic field is wound, and yokes provided at both ends of the bobbin. Is housed inside. Further, a shaft that passes through the bobbin and the yoke so as to be relatively reciprocally movable in the axial direction and is inserted into the cylinder is provided, and a magnetorheological fluid is filled between the shaft and the bobbin and the yoke.

  In the case of the above configuration, a bracket to which a bearing is fixed is provided outside the yoke inside the cylinder, and the shaft is supported by the bearing so as to be capable of reciprocating in the axial direction. Further, the magnet viscous fluid is prevented from leaking into the cylinder by bringing the seal member fixed to the bracket into close contact between the yoke and the shaft. However, in the above configuration, the seal member fixed to the bracket is pressed against the yoke so that the seal member is brought into close contact with the yoke. Therefore, if assembly variations such as insufficient pressing force of the seal member occur during assembly, the seal member May be reduced, or a gap may be generated between the seal member and the yoke due to vibration or the like. In such a case, there is a possibility that the magnetorheological fluid leaks into the cylinder from between the seal member and the yoke. In this case, there is a possibility that the vibration damping force is lowered and the characteristics are varied.

JP 2005-291284 A Japanese translation of PCT publication No. 2002-502942 JP 2006-57766 A

  Therefore, a damper for a washing machine that can reliably prevent leakage of a magnetorheological fluid is provided.

  According to the damper for a washing machine of the present embodiment, in the one having a function of attenuating the vibration of the water tank of the washing machine, a cylinder, a coil that is housed in the cylinder and generates a magnetic field, and the coil are wound. And a yoke housed inside the cylinder and provided at an end of the bobbin. The damper for the washing machine includes a shaft that passes through the bobbin and the yoke so as to be relatively reciprocally movable in the axial direction, and is inserted into the cylinder, and a resin that integrally forms the coil, the bobbin, and the yoke. The magnetorheological fluid filled between the shaft and the bobbin and the yoke, and the magnetorheological fluid from between the yoke and the shaft disposed at both end positions of the resin integrally molded. And a seal member for preventing leakage. Furthermore, the damper for the washing machine is provided with a recess for accommodating the seal member in the yokes disposed at both end positions, and the seal member is press-fitted and fixed in the recess.

1 is a longitudinal sectional view of a suspension including a damper according to a first embodiment. Longitudinal section of drum-type washing machine Longitudinal cross section of coil assembly Perspective view of coil assembly Side view of second yoke Partial longitudinal cross-sectional view of a portion where a lead wire is led out in a coil assembly Partial longitudinal cross-sectional view of a portion from which a lead wire is led out in a state where the coil assembly is accommodated in the cylinder Partial longitudinal sectional view of the damper according to the second embodiment FIG. 8 equivalent diagram according to the third embodiment FIG. 8 equivalent diagram according to the fourth embodiment FIG. 8 equivalent diagram according to the fifth embodiment FIG. 8 equivalent diagram according to the sixth embodiment FIG. 3 equivalent diagram according to the seventh embodiment FIG. 3 equivalent diagram according to the eighth embodiment Longitudinal sectional view showing the peripheral structure of the annular accommodating portion that does not accommodate the O-ring Cross section of O-ring FIG. 15 equivalent view showing a state in which the O-ring is accommodated in the annular accommodating portion. FIG. 3 equivalent diagram according to the ninth embodiment 17 equivalent diagram FIG. 3 equivalent diagram according to the tenth embodiment 17 equivalent diagram Front view of O-ring FIG. 3 equivalent diagram according to the eleventh embodiment

Hereinafter, a plurality of embodiments will be described with reference to the drawings. In each embodiment, substantially the same components are assigned the same reference numerals, and description thereof is omitted.
(First embodiment)
First, FIG. 2 shows the overall structure of the drum type washing machine according to the first embodiment, and the outer box 1 is an outer shell. A laundry entrance / exit 2 is formed at a central portion of the front portion (right side in FIG. 2) of the outer box 1, and a door 3 for opening and closing the entrance / exit 2 is provided. In addition, an operation panel 4 is provided at the upper part of the front surface 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. The aquarium 6 has a horizontal cylindrical shape whose axial direction is front and rear (right and left in FIG. 2). The water tank 6 is lifted forward by a pair of left and right (only one shown) suspensions 7 on the bottom plate 1a of the outer box 1. Inclined and elastically supported. The detailed structure of the suspension 7 will be described later.

  A motor 8 is attached to the back of the water tank 6. In this case, the motor 8 is composed of, for example, a direct current brushless motor, and is an outer rotor type. A rotating shaft (not shown) attached to the center portion of the rotor 8 a is connected to the inside of the water tank 6 via the bearing bracket 9. Is inserted.

  A drum 10 is disposed inside the water tank 6. This drum 10 also has a horizontal cylindrical shape with the front and rear being axially attached. By attaching it to the tip of the rotating shaft of the motor 8 at the center of the rear part, the drum 10 has a forwardly inclined shape coaxial with the water tank 6. I support it. As a result, the drum 10 is rotated by the motor 8, so that the drum 10 is a rotating tub and the motor 8 functions as a drum driving device that rotates the drum 10.

  A large number of small holes 11 (only a part is shown) are formed in the peripheral side portion (body portion) of the drum 10 over the entire area. Each of the drum 10 and the water tub 6 has openings 12 and 13 on the front surface thereof, and the laundry entrance 2 is connected to the opening 13 of the water tub 6 through an annular bellows 14. . As a result, the laundry entrance / exit 2 is connected 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 rear part of the bottom, which is the lowest part of the water tank 6, via a drain valve 15. A drying device 17 is disposed above and in front of the back of the water tank 6. This drying device 17 has a dehumidifier 18, a blower 19, and a heater 20, and dehumidifies the air in the water tank 6, and then heats the air to return it to the water tank 6. The laundry is to be dried.

  Here, the detailed structure of the suspension 7 will be described. The suspension 7 has a damper 21, and the damper 21 includes a cylinder 22 and a shaft 23 as main members as shown in FIG. Among these, the cylinder 22 has a connecting member 24 at the lower end, and the connecting member 24 is passed through the mounting plate 25 of the bottom plate 1a of the outer box 1 from above as shown in FIG. It is attached to the bottom plate 1a of the outer box 1 by fastening with a nut 27 via a plate 26 or the like.

  Further, the shaft 23 has a connecting portion 23a at the upper end portion, and the connecting portion 23a is passed through the mounting plate 28 of the water tank 6 from below as shown in FIG. The nut 30 is fastened to the water tank 6 by fastening. As shown in FIG. 1, a spring receiving seat 31 is fitted and fixed to the upper portion of the shaft 23 located on the upper outside of the cylinder 22, and between the spring receiving seat 31 and the upper end portion of the cylinder 22. Is equipped with a coil spring 32 comprising a compression coil spring surrounding the shaft 23.

  An annular lower bracket 33 is accommodated in an intermediate portion inside the cylinder 22, and a groove 33 a is formed in the outer peripheral portion of the lower bracket 33, and the groove 33 a in the peripheral wall portion of the cylinder 22 is formed in the groove 33 a. The lower bracket 33 is fixed to the cylinder 22 by squeezing the corresponding portion inward. A bearing 34 that supports the shaft 23 so as to be movable in the vertical direction is accommodated and fixed to the inner peripheral portion of the lower bracket 33. The bearing 34 is made of, for example, sintered oil-impregnated metal.

  An annular upper bracket 35 is accommodated in the upper end portion inside the cylinder 22, and a groove 35 a is formed in the outer peripheral portion of the upper bracket 35, and the groove 35 a in the peripheral wall portion of the cylinder 22 is formed in the groove 35 a. The upper bracket 35 is fixed by crimping the corresponding portion inward. A bearing 36 that supports the shaft 23 so as to be movable in the vertical direction is accommodated and fixed to the inner peripheral portion of the upper bracket 35. The bearing 36 is made of, for example, sintered oil-impregnated metal. Note that the cylindrical portion 35 b that protrudes upward from the upper surface portion in FIG. 1 of the upper bracket 35 protrudes upward through the opening at the upper end portion of the cylinder 22.

  A coil assembly 37 is accommodated in a portion between the lower bracket 33 and the upper bracket 35 inside the cylinder 22, and the coil assembly 37 is sandwiched and fixed between the lower bracket 33 and the upper bracket 35. Yes. The coil assembly 37 is formed with a through hole 38 through which the shaft 23 is inserted and movable in the vertical direction. The detailed structure of the coil assembly 37 will be described with reference to FIGS.

  As shown in FIG. 3, the coil assembly 37 includes a first yoke 39, a first bobbin 41 around which the first coil 40 is wound, a second yoke 42, and a second coil 43. A second bobbin 44 and a third yoke 45 are provided. As shown in FIGS. 3 and 4, the coils 40 and 43, the bobbins 41 and 44 and the yokes 39, 42 and 45 are integrally molded (molded) with a resin 46. FIG. 4 is a perspective view showing the coil assembly 37 upside down.

  Here, on the upper and lower end plates 47 in FIG. 3 of the first bobbin 41 and the second bobbin 44, for example, four convex portions for positioning (not shown) are directed upward and downward at substantially equal intervals, for example. Projected. A concave portion (not shown) in which the convex portion of the end plate 47 is fitted is formed on the side surface of the first yoke 39 facing the end plate 47 of the first bobbin 41. In the second yoke 42, four through holes 52 are formed so as to open on the side surfaces on both sides (see FIG. 5), and the first bobbin 41 and the second bobbin 44 are formed in these through holes 52. It is comprised so that the convex part of the end plate 47 may fit. Further, a concave portion (not shown) into which the convex portion of the end plate 47 is fitted is formed on the side surface of the third yoke 45 on the side facing the end plate 47 of the second bobbin 44.

  Further, an annular recess 49 is formed on the lower surface of the first yoke 39 in FIG. 3, and an annular seal member 50 is press-fitted and fixed in the annular recess 49. The depth of the recess 49 is set to be approximately the same as the vertical dimension of the seal member 50 in FIG. 3, so that the seal member 50 does not protrude from the side surface (lower surface) of the first yoke 39. ing. The seal member 50 is made of rubber (NBR), and its short cylindrical outer peripheral portion 50 a is press-fitted into and closely contacts the inner peripheral portion of the annular concave portion 49, and the tip (upper end) of the outer peripheral portion 50 a is in close contact with the inner bottom portion of the concave portion 49. doing. Furthermore, the shaft 23 is in close contact with the short cylindrical inner peripheral portion 50b of the seal member 50 in a state in which the shaft 23 can move in the axial direction. A known lip (not shown) is formed on the inner peripheral portion 50 b toward the shaft 23, so that a magnetorheological fluid 64, which will be described later, enters the cylinder 22 from between the first yoke 39 and the shaft 23. It is configured to be sealed so as not to leak.

  Further, an annular recess 53 is formed on the upper side surface of the third yoke 45 in FIG. 3, and an annular seal member 54 is press-fitted and fixed in the annular recess 53. The depth of the annular recess 53 is set to be substantially the same as the vertical dimension of the seal member 54 in FIG. 3 so that the seal member 54 does not protrude from the side surface (upper surface) of the third yoke 45. It has become. The seal member 54 is also made of rubber (NBR), and its short cylindrical outer peripheral portion 54 a is in close contact with the inner peripheral portion of the annular concave portion 53, and the tip (lower end) of the outer peripheral portion 54 a is in close contact with the inner bottom portion of the concave portion 53. Yes. Further, the shaft 23 is in close contact with the short cylindrical inner peripheral portion 54b of the seal member 54 in a state where the shaft 23 is movable in the axial direction. A known lip (not shown) is also formed on the inner peripheral portion 54 b toward the shaft 23, so that the magnetorheological fluid 64 does not leak into the cylinder 22 from between the third yoke 45 and the shaft 23. Thus, the structure is sealed.

  In the case of the above configuration, as shown in FIG. 3, the end plate 47 of the first bobbin 41 is brought into contact with the side surface of the first yoke 39, and the first bobbin 41 and the second bobbin 41 are placed on both side surfaces of the second yoke 42. The end plates 47 of the second bobbin 44 are brought into contact with each other, and the end plates 47 of the second bobbin 44 are brought into contact with the side surfaces of the third yoke 45. Thereafter, the assembled yokes 39, 42, 45 and bobbins (coils 40, 43) 41, 44 are accommodated in a mold (not shown) and integrally molded (molded) with the resin 46. As the resin 46, for example, a thermoplastic resin (nylon, PBT, PET, PP, etc.) is used. In this case, as shown in FIG. 3, the resin 46 covers the outer peripheral portions of the coils 40 and 43 and the bobbins 41 and 44, and covers the upper portion in the axial direction of the outer peripheral portion of the first yoke 39. The lower part of the outer peripheral part of 45 is covered in the axial direction.

  Further, the resin 46 is filled in a ring-shaped groove 39a formed on the outer peripheral portion of the first yoke 39, and, for example, four pieces are formed on the outer peripheral portion of the second yoke 42 in the axial direction at substantially equal intervals. The groove 42 a (see FIG. 5) is filled in such a manner that the outer peripheral surface of the other yoke 42 is exposed, and is filled in a ring-shaped groove 45 a formed on the outer peripheral portion of the third yoke 45. The exposed portion of the outer peripheral surface of the yoke 42 is configured to reduce the magnetic resistance with a cylinder, which will be described later. Of the four grooves 42a of the second yoke 42, the groove 42a located at the top in FIG. 5 is formed wider and wider than the other three grooves 42a.

  Here, the inner diameter dimension of the through hole 38 (hole into which the shaft 23 is inserted) of the resin-molded coil assembly 37 as described above will be described. The inner diameters of the three yokes 39, 42, and 45 are set to be substantially the same, and a gap of, for example, about 0.4 mm is formed between the outer periphery of the shaft 23. The inner diameters of the two bobbins 41 and 44 are set to substantially the same size, and are set slightly larger than the inner diameters of the three yokes 39, 42, and 45. For example, a gap of about 1.0 mm is formed between them.

  Further, as shown in FIGS. 4 and 7, the inner peripheral portion and the outer peripheral portion of the second yoke 42 are communicated with the central portion of the upper large groove 42 a in FIG. 5 in the second yoke 42. The through-hole 42b is formed in. A pipe 55 having a thread portion formed on the outer periphery is fastened and fixed in the through hole 42b. The pipe 55 is a member for filling and injecting the magnetorheological fluid 64.

  Further, the two coils 40 and 43 are connected in series, and lead wires 56 and 56 are connected to both terminals, and these lead wires 56 and 56 are formed of a molded portion of the resin 46. Of these, the second yoke 42 is led out from the large groove 42a at the top in FIG. In this case, as shown in FIGS. 4 and 6, a rubber or resin support component 57 for supporting the lead wires 56, 56 is disposed in the large groove 42 a of the second yoke 42, and the resin 46 It is molded with. A T-shaped support hole 57a is formed in the support component 57, and lead wires 56 are accommodated in the support hole 57a. The support component 57 is divided into two along the support hole 57a in order to accommodate the lead wires 56, 56 in the support hole 57a. The lead wires 56 and 56 are guided from the coils 40 and 43 into the support holes 57a of the support component 57 through guide grooves (not shown) formed in the end plates 47 and 47 of the bobbins 41 and 44. .

  Further, as shown in FIGS. 4 and 7, a substantially circular recess 58 is formed in a portion corresponding to the through hole 42b (groove 42a) of the second yoke 42 in the mold portion of the resin 46. An accommodation groove 59 for accommodating the lead wires 56 is formed so as to extend downward (upward in FIG. 4) from the recess 58. A housing groove 39 b for housing the lead wires 56 is formed in a portion corresponding to the housing groove 59 in the outer peripheral portion of the first yoke 39.

  Next, an operation for housing the coil assembly 37 molded with the resin 46 as described above into the cylinder 22 will be described. In this case, as shown in FIG. 1, the upper bracket 35 to which the bearing 36 is attached is stored in the cylinder 22 in advance, and a portion corresponding to the groove 35 a of the upper bracket 35 in the peripheral wall portion of the cylinder 22 is formed. The upper bracket 35 is fixed in the cylinder 22 by caulking inward (a state before caulking is shown in FIG. 1).

  As for the coil assembly 37, as shown in FIGS. 4, 5, 6 and 7, the lead wire 56 led out from the resin mold portion (support component 57) is connected to the recess 58, the accommodation groove 59 and the accommodation groove. The lead wire 56 is accommodated in 39 b so that it does not protrude from the outer peripheral surface of the coil assembly 37. Further, the seal member 50 is fitted (press-fit) and fixed in the recess 49 of the first yoke 39 of the coil assembly 37, and the seal member 54 is fitted (press-fit) in the recess 53 of the third yoke 45. ) Keep it fixed.

  Then, the lead wire 56 is treated as described above, and the coil assembly 37 to which the seal members 50 and 54 are attached is accommodated in the cylinder 22 (see FIG. 1). At this time, the coil assembly 37 is accommodated in the cylinder 22 so that the recess 58 of the coil assembly 37 and the hole 60 (see FIG. 7) formed in the peripheral wall portion of the cylinder 22 are aligned. Subsequently, the lead wires 56 and 56 are pulled out from the hole 60 of the cylinder 22, and the lead wires 56 and 56 are led out of the cylinder 22 through the hole 60. Further, as shown in FIG. 7, after the lead wire 56 is passed through the hole of the rubber or resin bush 61, the bush 61 is fitted and fixed to the hole 60 of the cylinder 22. The lead wire 56 led out from the bush 61 is connected to a control circuit (control device 5) that controls energization of the coils 40 and 43.

  Next, as shown in FIG. 1, after the lower bracket 33 to which the bearing 34 is mounted is accommodated in the cylinder 22, a portion corresponding to the groove 33 a of the lower bracket 33 in the peripheral wall portion of the cylinder 22 is inward. The upper bracket 33 is fixed in the cylinder 22 by caulking. FIG. 1 shows a state before caulking.

  Thereafter, the shaft 23 before the spring seat 31 is attached is inserted into the cylinder 22, and the opening of the lower bracket 33, the bearing 34, the seal member 50, the first yoke 39, and the first bobbin 41 (first Coil 40), the second yoke 42, the second bobbin 44 (second coil 43), the third yoke 45, the seal member 54, the bearing 36, and the opening of the upper bracket 35 are sequentially passed through the cylinder. It protrudes above 22.

  In this state, the shaft 23 is supported by the bearings 34 and 36, and the bearing 34, the seal member 50, the first yoke 39, the first bobbin 41 (first coil 40), and the second yoke 42. The second bobbin 44 (second coil 43), the third yoke 45, the seal member 54, and the bearing 36 are relatively reciprocable in the axial direction (vertical direction). Note that a retaining ring 62 for retaining is attached to the lower end portion of the shaft 23, and the inside of the cylinder 22 below is a cavity 63 (see FIG. 1).

  A spring receiving seat 31 is fitted and fixed to a lower portion of the shaft 23 located above the outside of the cylinder 22, and the shaft 23 is surrounded between the spring receiving seat 31 and the upper end of the cylinder 22. A coil spring 32 comprising a compression coil spring is attached.

  Further, a magnetorheological fluid 64 is injected and filled between the shaft 23 and the bobbins 41 and 44 (coils 40 and 43) and between the shaft 23 and the yokes 39, 42 and 45 which are in the vicinity thereof. (See FIGS. 1 and 3). The magnetorheological fluid 64 is sealed by seal members 50 and 54 so as not to leak into the cylinder 22 from between the yokes 39 and 45 and the shaft 23.

  When injecting the magnetorheological fluid 64 between the above, a tube (not shown) is connected to the pipe 55 with the bush 61 shown in FIG. 7 removed from the hole 60 in the peripheral wall portion of the cylinder 22. After exhausting (evacuating) the air in the spaces through the tubes, the magnetorheological fluid 64 is injected into the spaces through the tubes. After the injection of the magnetorheological fluid 64, the opening of the pipe 55 is sealed with a seal member (not shown) or the like, and then the bush 61 is fitted into the hole 60 of the cylinder 22 and attached.

  Then, the suspension 7 configured as described above is incorporated between the water tank 6 and the bottom plate 1a of the outer box 1 so that the water tank 26 is supported on the bottom plate 21a of the outer box 21 by vibration isolation.

  According to the present embodiment having such a configuration, the annular recesses 49 and 53 are formed in the first yoke 39 and the third yoke 45 of the coil assembly 37, and the seal member 50 is formed in the recesses 49 and 53. , 54 are configured to be fitted (press-fit) and fixed, unlike the conventional configuration, the closeness between the inner peripheral portions 50b, 54b of the seal members 50, 54 and the shaft 23, and the seal member 50, The degree of closeness between the outer peripheral portions 50a and 54a of the 54 and the concave portions 49 and 53 can be sufficient regardless of assembly variations, vibrations, and the like. This is because in the conventional configuration, the sealing member is configured to ensure the sealing performance by applying a force to press the seal member in the axial direction. However, in the above embodiment, such an axial pressing force is not necessary. It is. Accordingly, in the above embodiment, the seal members 50 and 54 prevent the magnetorheological fluid 64 from leaking into the cylinder 22 from between the yokes 39 and 45 on either the upper and lower sides of the coil assembly 37 and the shaft 23. Therefore, not only the downward movement due to the gravity of the magnetorheological fluid 64 but also any movement in the vertical direction that moves with the vertical movement of the shaft 23 can be surely prevented. Variations can be prevented, and the start of the dehydration operation can be stabilized.

  In the above embodiment, when the coil assembly 37 is configured, the coils 40, 43, the bobbins 41, 44 and the yokes 39, 42, 45 are integrally molded (molded) with the resin 46. When attaching and fixing the yokes 39, 42, 45 to the ends, the dimensional accuracy and assembly accuracy of the parts of the bobbins 41, 44 and the yokes 39, 42, 45 are reduced, so that there is a gap between the parts. Even if this occurs, the gap can be sealed with the molded resin 46. For this reason, it is possible to prevent the magnetorheological fluid 64 from leaking from the gap. Further, the fixing strength of the bobbins 41 and 44 and the yokes 39, 42 and 45 can be sufficiently increased. Further, since the seal members 50 and 54 are provided at the upper and lower ends of the coil assembly 37, even if it is necessary to attach the suspension 7 upside down, the magnet viscous fluid 64 should be used without any risk of leakage. Can do.

(Second Embodiment)
FIG. 8 shows a second embodiment. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment. In the second embodiment, the length dimension in the axial direction (vertical direction) of the first yoke 39 and the third yoke 45 is lengthened, and the depth dimension (vertical dimension) of the concave portions 49 and 53 is deepened. The bearings 34 and 36 are accommodated and fixed together with the seal members 50 and 54 in the recesses 49 and 53. Note that the bearing 34 is prevented by a retaining ring 65. And the lower bracket 33 was made unnecessary and the length dimension of the upper bracket 35 in the axial direction (vertical direction) was shortened. Further, caulking grooves 39c and 45c of the cylinder 22 are formed in the outer peripheral portions of the yokes 39 and 45.

  The configuration of the second embodiment other than that described above is the same as the configuration of the first embodiment. Therefore, in the second embodiment, substantially the same operational effects as in the first embodiment can be obtained. In particular, according to the second embodiment, since the shaft 23 and the bearings 34 and 36 can be decentered, the magnetorheological fluid flows between the shaft 23 and the seal members 50 and 54 when the decentering is large. It is possible to prevent a situation in which 64 leaks out. Moreover, since the lower bracket 33 can be made unnecessary, the number of parts can be reduced.

(Third embodiment)
FIG. 9 shows a third embodiment. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment. In the third embodiment, an O-ring 66 is disposed between the yokes 39, 42, 45 and the end plates 47 of the bobbins 41, 44. Specifically, an annular groove (recess) 67 is provided on the side surfaces (side surfaces of the yokes 39, 42, and 45), and the O-ring 66 is accommodated in the groove 67. .

  The configuration of the third embodiment other than that described above is the same as the configuration of the first embodiment. Therefore, in the third embodiment, substantially the same operational effects as in the first embodiment can be obtained. In particular, according to the third embodiment, since the O-ring 66 is disposed between the yokes 39, 42, 45 and the end plate 47 of the bobbins 41, 44, the yokes 39, 42, 45 and the bobbins 41, 44 It is possible to further prevent the magnetic viscous fluid 64 from leaking from the end plate 47.

(Fourth embodiment)
FIG. 10 shows a fourth embodiment. In addition, the same code | symbol is attached | subjected to the same structure as 2nd Embodiment and 3rd Embodiment. In the fourth embodiment, the depths (vertical dimensions) of the recesses 49 and 53 of the first yoke 39 and the third yoke 45 are increased to accommodate and fix the bearings 34 and 36, and the yoke 39, The O-ring 66 is arranged between the end plates 47 of the bobbins 41 and 44. The configurations of the fourth embodiment other than those described above are the same as the configurations of the second embodiment and the third embodiment. Accordingly, in the fourth embodiment, substantially the same operational effects as those in the second and third embodiments can be obtained.

(Fifth embodiment)
FIG. 11 shows a fifth embodiment. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment. In the fifth embodiment, the yokes 39, 42, 45 and the end plates 47 of the bobbins 41, 44 are bonded with an adhesive 68. The configuration of the fifth embodiment other than that described above is the same as the configuration of the first embodiment. Therefore, in the fifth embodiment, substantially the same operational effects as in the first embodiment can be obtained. In particular, according to the fifth embodiment, the yokes 39, 42, 45 and the end plates 47 of the bobbins 41, 44 are sealed by bonding with the adhesive 68. , 44 can further prevent leakage of the magnetorheological fluid 64 from between the end plates 47.

(Sixth embodiment)
FIG. 12 shows a sixth embodiment. In addition, the same code | symbol is attached | subjected to the same structure as 2nd Embodiment and 5th Embodiment. In the sixth embodiment, the depths (vertical dimensions) of the recesses 49, 53 of the first yoke 39 and the third yoke 45 are increased to accommodate and fix the bearings 34, 36, and the yoke 39, 42 and 45 and the end plates 47 of the bobbins 41 and 44 are sealed by bonding with an adhesive 68. The configurations of the sixth embodiment other than those described above are the same as the configurations of the second embodiment and the fifth embodiment. Therefore, in the sixth embodiment, it is possible to obtain substantially the same operational effects as those in the second embodiment and the fifth embodiment.

(Seventh embodiment)
FIG. 13 shows a seventh embodiment. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment. In the seventh embodiment, when the yoke 39, 42, 45 and the bobbin (coils 40, 43) 41, 44 are integrally molded with the resin 46, the yoke 39, 42, The outer peripheral surface of 45 is covered with resin 46. The configurations of the seventh embodiment other than those described above are the same as the configurations of the first embodiment. Therefore, also in the seventh embodiment, substantially the same operational effects as in the first embodiment can be obtained. In particular, according to the seventh embodiment, since the outer peripheral surfaces of the yokes 39, 42, 45 are covered with the resin 46, the strength of the coil assembly 37 (that is, the fixing strength of the coil, bobbin, and yoke) is further increased. While being able to make it higher, it can further prevent that the magnetorheological fluid 64 leaks from between the yokes 39, 42, 45 and the end plates 47 of the bobbins 41, 44. Since the resin 46 positioned on the outer peripheral surfaces of the yokes 39, 42, and 45 has a magnetic resistance with the cylinder, the magnetic resistance can be reduced by forming the resin 46 to be extremely thin compared to the thickness of the resin in other portions. Increase as much as possible.

(Eighth embodiment)
14 to 17 show an eighth embodiment. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment. In the eighth embodiment, an O-ring 71 is disposed between the yokes 39, 42, 45 and the end plates 47 of the bobbins 41, 44.

  Specifically, as shown in FIGS. 14 and 15, an annular convex portion is provided on the outer surface of the end plate 47 of the bobbins 41 and 44 so that the cylindrical portion of the bobbins 41 and 44 protrudes outward of the end plate 47. 72 was formed. An annular fitting portion 73 for fitting the annular convex portion 72 is provided on the side surfaces (side surfaces facing the end plate 47) of the yokes 39, 42, and 45. Further, a step is provided on the annular fitting portion 73. An annular accommodating portion (concave portion) 74 is provided so as to be continuous in a sticking shape. The O-ring 71 is accommodated in the annular accommodating portion 74 (see FIG. 17).

  Further, as shown in FIG. 16, the thickness dimension of the O-ring 71 (that is, the diameter dimension of the portion cut into a ring) is A, and the depth dimension in the axial direction (vertical direction in FIG. 15) of the annular housing portion 74 is defined. When B, A> B is established. As a result, as shown in FIG. 17, the O-ring 71 is sandwiched between the inner surface (the surface facing the end plate 47) of the annular housing portion 74 and the end plate 47, and is pressed and deformed with a force of an appropriate size. It becomes the composition which is done. As a result, the O-ring 71 can further prevent the magnetorheological fluid 64 from leaking between the yokes 39, 42, 45 and the end plates 47 of the bobbins 41, 44.

  Furthermore, in the case of the above configuration, when the cross-sectional area of the annular housing portion 74 is S1 (see FIG. 15) and the cross-sectional area of the O-ring 71 is S2 (see FIG. 16), S1> S2 is established and S1 Is configured to be as close as possible to S2. As a result, when the O-ring 71 is pressed and deformed (note that even if the O-ring 71 is deformed, its cross-sectional area S2 does not change), the O-ring 71 does not protrude from the annular housing portion 74. The sealing performance of the O-ring 71 is maintained uniformly.

  The O-ring 71 is made of a material having elasticity and high heat resistance, such as silicon rubber or fluorine rubber. Thereby, since the O-ring 71 has sufficient heat resistance, when the coils 40, 43, the bobbins 41, 44 and the yokes 39, 42, 45 are molded with the resin 46, the O-ring 71 is about 200 ° C. Although it is heated to a temperature, it is possible to prevent the sealing performance of the O-ring 71 from deteriorating.

  The configuration of the eighth embodiment other than that described above is the same as the configuration of the first embodiment. Accordingly, in the eighth embodiment, substantially the same operational effects as in the first embodiment can be obtained. In particular, according to the eighth embodiment, the yokes 39, 42, 45 are provided with the annular accommodating portions 74, and the O-ring 71 is accommodated in the annular accommodating portions 74, whereby the yokes 39, 42, 45 and the bobbins 41, Since the O-ring 71 is arranged between the end plate 47 of 44 and the end plate 47 of the bobbins 41, 44, the magnetorheological fluid 64 leaks more. This can be further prevented.

  Further, in the eighth embodiment, when the diameter dimension (that is, the thickness dimension) of the O-ring 71 is A, and the depth dimension in the axial direction (vertical direction in FIG. 15) of the annular accommodating portion 74 is B, Since A> B is established, the O-ring 71 is sandwiched between the inner surface of the annular housing portion 74 and the end plate 47 and is pressed and deformed with an appropriate amount of force. Performance can be ensured. Furthermore, when the cross-sectional area of the annular accommodating portion 74 is S1 and the cross-sectional area of the O-ring 71 is S2, S1> S2 is established. Therefore, when the O-ring 71 is deformed, the O-ring 71 Does not protrude from the annular housing portion 74, and the sealing performance of the O-ring 71 can be maintained uniformly.

  Furthermore, since the O-ring 71 is made of a material having elasticity and high heat resistance, for example, silicon rubber or fluorine rubber, the coils 40 and 43, the bobbins 41 and 44, and the yokes 39, 42, and 45 are connected to the resin 46. The O-ring 71 is heated when being molded with the O-ring 71. However, since the O-ring 71 has sufficient heat resistance, the sealing performance does not deteriorate.

(Ninth embodiment)
18 and 19 show a ninth embodiment. In addition, the same code | symbol is attached | subjected to the same structure as 8th Embodiment. In the ninth embodiment, as shown in FIGS. 18 and 19, an annular convex portion 75 is formed at a portion of the end plate 47 that faces the inner surface of the annular accommodating portion 74 of the yokes 39, 42, and 45. Then, the O-ring 71 is pushed and deformed by the annular convex portion 75.

  The configurations of the ninth embodiment other than those described above are the same as the configurations of the eighth embodiment. Therefore, in the ninth embodiment, substantially the same operational effects as in the eighth embodiment can be obtained. In particular, according to the ninth embodiment, since the O-ring 71 is pushed and deformed by the annular convex portion 75 of the end plate 47, the deformation amount of the O-ring 71 can be increased, and the seal of the O-ring 71 can be increased. Performance can be increased.

  In the ninth embodiment, the annular convex portion 75 is provided on the end plate 47. Instead, the annular convex portion 75 is provided on the inner surface (end plate 47) of the annular accommodating portion 74 of the yokes 39, 42, 45. It may be configured to be provided on the surface facing the surface.

(10th Embodiment)
20 to 22 show a tenth embodiment. In addition, the same code | symbol is attached | subjected to the same structure as 8th Embodiment. In the tenth embodiment, as shown in FIG. 20 and FIG. 21, the outer diameter of the annular convex portion 72 of the bobbins 41 and 44 is D1, and the inner diameter of the annular accommodating portion 74 of the yokes 39, 42, and 45 is the same. As shown in FIG. 22, when the inner diameter dimension of the O-ring 71 is d1 and the outer diameter dimension of the O-ring 71 is d2, d1 <D1 and d2> D2 are established. . In the case of the above configuration, when the cross-sectional area of the annular housing portion 74 is S1 and the cross-sectional area of the O-ring 71 is S2, S1> S2 is established, and S1 is as close as possible to S2. It is configured.

  In the above configuration, since d1 <D1, the inner peripheral portion of the O-ring 71 is in close contact with the outer peripheral surface of the annular convex portion 72. Since d2> D2, the outer peripheral portion of the O-ring 71 is in close contact with the inner peripheral surface of the annular housing portion 74. That is, the O-ring 71 is pressed and deformed by inner and outer diameter fitting (fitting in the left-right direction in FIG. 21) to ensure sealing performance, and end plates of the yokes 39, 42, 45 and the bobbins 41, 44. It is possible to prevent the magnetorheological fluid 64 from leaking from the space 47.

  The configuration of the tenth embodiment other than that described above is the same as the configuration of the eighth embodiment. Therefore, in the tenth embodiment, substantially the same operational effects as in the eighth embodiment can be obtained.

(Eleventh embodiment)
FIG. 23 shows an eleventh embodiment. In addition, the same code | symbol is attached | subjected to the same structure as 8th Embodiment. In the eleventh embodiment, as shown in FIG. 23, the annular convex portions 76 and 77 are doubled so as to protrude outward on the outer peripheral portion of the O-ring 71 on the outer surface of the end plate 47 of the bobbins 41 and 44. Formed. And the annular fitting parts 78 and 79 which fit the said annular convex parts 76 and 77 were provided in the side surface (side surface facing the end plate 47) of the yokes 39, 42, and 45 double. In the case of the above configuration, the annular protrusions 76 and 77 of the end plate 47 and the annular fitting portions 78 and 79 of the yokes 39, 42, and 45 are fitted to the outer periphery of the O-ring 71 in addition to the sealing structure by the O-ring 71. By combining, a labyrinth seal structure is formed.

  The configuration of the eleventh embodiment other than that described above is the same as the configuration of the eighth embodiment. Accordingly, in the eleventh embodiment, substantially the same operational effects as in the eighth embodiment can be obtained. In particular, according to the eleventh embodiment, in addition to the seal structure by the O-ring 71, the labyrinth is formed by fitting the annular projections 76, 77 of the end plate 47 and the annular fitting portions 78, 79 of the yokes 39, 42, 45. Since the seal structure is provided, leakage of the magnetorheological fluid 64 from between the yokes 39, 42, 45 and the end plates 47 of the bobbins 41, 44 can be prevented more reliably.

(Other embodiments)
In addition to the plurality of embodiments described above, the following configurations may be adopted.
In each of the embodiments described above, two coils 40 and 43 (bobbins 41 and 44) are provided. However, the present invention is not limited to this, and one or three or more coils (bobbins) may be provided. good. Thereby, by setting the number of coils (bobbins) and yokes according to the purpose of use such as the washing capacity, the vibration damping force can be made appropriate according to the purpose of use.

  Further, in each of the third, fourth, and eighth to eleventh embodiments, the groove portion 67 as the concave portion that accommodates the O-rings 66 and 71 and the annular accommodating portion 74 are provided in the yokes 39, 42, and 45. A recess for accommodating the O-rings 66 and 71 may be provided in the end plates 47 of the bobbins 41 and 44.

  Furthermore, in the eleventh embodiment, the labyrinth seal structure is provided on the outer peripheral portion of the O-ring 71, but instead, the labyrinth seal structure may be provided on the inner peripheral portion of the O-ring 71, You may provide in both an inner peripheral part and an outer peripheral part.

  Further, in each of the third, fourth, and eighth to eleventh embodiments, the O-rings 66 and 71 have circular cross-sectional shapes (see FIG. 16), but are not limited to this, and the cross-sectional shapes are not limited thereto. For example, various shapes such as a square, a rectangle, a pentagon, a hexagon, and an ellipse may be used. Furthermore, as a method of manufacturing the O-rings 66 and 71, a method of forming with upper and lower molds, a method of manufacturing by connecting extruded shaped string-like items in a ring shape, or manufacturing by punching a plate member into a ring shape It is preferable to use a method or the like.

  As described above, according to the damper for the washing machine of the present embodiment, the concave portions for accommodating the seal members are provided in the yokes disposed at both ends of the integrally molded resin, and the seal members are press-fitted into the concave portions. Thus, the leakage of the magnetorheological fluid can be surely prevented, and since there is no fear of leakage from either the upper or lower side, the degree of freedom in the direction of the suspension can be increased.

  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, 17 is a drying device, 18 is a dehumidifier, 19 is a blower, 20 is a heater, 21 is a damper, and 22 is a cylinder. , 23 is a shaft, 24 is a connecting member, 25 is a mounting plate, 26 is an elastic seat plate, 27 is a nut, 28 is a mounting plate, 29 is an elastic seat plate, 30 is a nut, 31 is a spring seat, and 32 is a coil spring. , 33 is a lower bracket, 34 is a bearing, 35 is an upper bracket, 36 is a bearing, 37 is a coil assembly, 38 is a through hole, 39 is a first yoke, 40 is a first coil, and 41 is a first bobbin. , 42 is a second yoke, 43 is a second coil, 44 is a second bobbin, 45 is a third yoke, 46 is a resin, 47 is an end plate, 49 is a recess, 50 is a sealing member, and 52 is a through-hole. Hole, 53 is a recess, 54 is a seal member, 56 is a lead , 57 is a support part, 58 is a recess, 59 is a receiving groove, 64 is a magnetorheological fluid, 66 is an O-ring, 67 is a groove (recess), 68 is an adhesive, 71 is an O-ring, 72 is an annular protrusion, 73. Is an annular fitting portion, 74 is an annular accommodating portion (concave portion), 75 is an annular convex portion, 76 is an annular convex portion, 77 is an annular convex portion, 78 is an annular fitting portion, and 79 is an annular fitting portion.

Claims (11)

In a damper for a washing machine having a function of attenuating vibration of a water tank of the washing machine,
A cylinder,
A coil that is housed in the cylinder and generates a magnetic field, and a bobbin around which the coil is wound;
A yoke housed in the cylinder and provided at an end of the bobbin;
A shaft that passes through the bobbin and the yoke so as to be relatively reciprocally movable in the axial direction and is inserted into the cylinder;
Resin for integrally molding the coil, the bobbin and the yoke;
A magnetorheological fluid filled between the shaft and the bobbin and the yoke;
A seal member for preventing leakage of the magnetorheological fluid from between the shaft and the yoke disposed at both ends of the resin integrally molded;
A damper for a washing machine, wherein the yokes disposed at both ends are provided with recesses for accommodating the seal members, and the seal members are press-fitted into the recesses.   The damper for a washing machine according to claim 1, wherein a depth dimension in the axial direction of the concave portion is increased and a bearing supporting the shaft is accommodated in the concave portion.   3. The damper for a washing machine according to claim 1, wherein an O-ring for preventing leakage of the magnetorheological fluid is disposed between the end plate of the bobbin and the yoke.   The damper for a washing machine according to claim 1 or 2, wherein an end plate of the bobbin and the yoke are bonded via an adhesive.   4. The damper for a washing machine according to claim 3, wherein an annular recess is provided in one of the end plate of the bobbin or the yoke, and the O-ring is accommodated in the recess.   6. The damper for a washing machine according to claim 5, wherein a convex portion for pressing an O-ring accommodated in the concave portion is provided on the other of the end plate of the bobbin or the yoke.   6. The damper for a washing machine according to claim 5, wherein a depth dimension of the recess is smaller than a thickness dimension of the O-ring.   The damper for a washing machine according to claim 7, wherein a cross-sectional area of the concave portion is larger than a cross-sectional area of the O-ring. An annular convex portion is formed on the outer surface of the end plate of the bobbin so that the cylindrical portion of the bobbin protrudes outward of the end plate, and the outer peripheral surface of the convex portion and the inner peripheral surface of the concave portion formed in the yoke Configured to accommodate the O-ring between
When the outer diameter dimension of the convex portion of the bobbin is D1, the inner diameter dimension of the concave portion of the yoke is D2, the inner diameter dimension of the O-ring is d1, and the outer diameter dimension of the O-ring is d2, d1 < 6. The damper for a washing machine according to claim 5, wherein D1 and d2> D2 are established.   6. The damper for a washing machine according to claim 5, wherein a labyrinth seal structure is provided on an inner peripheral portion or an outer peripheral portion of the O-ring in the end plate of the bobbin and the yoke.   The damper for a washing machine according to any one of claims 5 to 10, wherein the O-ring is formed of a material having elasticity and high heat resistance.

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