JP2011041644A - Drum type washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a drum type washing machine light-weight while ensuring a required damping force of a suspension which elastically supports a water tub internally arranging the drum of the drum type washing machine, and to enable materials to be saved. <P>SOLUTION: The saturated magnetic flux densities of a cylinder 25, an upper yoke 35, a lower yoke 36 and a rod 23 which are members to constitute a magnetic circuit in the suspension 7 are roughly the same. The inner peripheral area of each through-hole of the upper yoke 35 and the lower yoke 36, and the radial directional cross section of the cylinder 25 are set to be larger than or equal to the radial directional cross section of the rod 23 which is located in both through-holes. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a drum-type washing machine in which a water tank containing a drum is elastically supported by a suspension.

  Conventionally, a drum-type washing machine is configured so that a drum is rotatably provided in a horizontal axis inside a water tub, and the water tub is elastically supported by a plurality of suspensions erected on the bottom plate of the outer box. The vibration of time is reduced.

  The suspension disclosed in FIG. 1 of Patent Document 1 is filled with a cylinder, a coil disposed on the outer periphery of the cylinder to generate a magnetic flux, a piston disposed in the cylinder, and a gap between the cylinder and the piston. A closed-loop magnetic circuit is obtained by the magnetic viscous fluid. Magnetic flux is caused to act on the magnetorheological fluid by flowing magnetic flux through the magnetic circuit, and the suspension generates a shearing force on the magnetorheological fluid between the cylinder and the piston to obtain a damping force.

JP 2005-291338 A

  In the above configuration, in order to increase the damping force of the suspension, the magnetic path is made to flow a larger amount of magnetic flux. Therefore, the material constituting the magnetic path is sometimes used in an excessive amount. There was a risk of increasing the weight.

  In order to solve the above problems, an object of the present invention is to provide a drum type washing machine that realizes weight reduction and material saving while securing a necessary damping force of a suspension.

  In order to achieve the above object, an invention according to claim 1 includes a water tank that houses a drum rotated by a motor, and a suspension that elastically supports the water tank, and the suspension includes a cylinder and an interior of the cylinder. A bearing that is fixed to the bearing, a rod that is supported so as to be capable of reciprocating in the axial direction relative to the bearing, a magnetic flux generator that surrounds the rod and generates a magnetic flux inside the cylinder, and A yoke that is fixed to the cylinder on both sides in the axial direction of the magnetic flux generator and has a through hole into which the rod is inserted is formed in the center, and is filled between the rod and the yoke in the through hole. And the cylinder, the yoke, and the rod are made of a magnetic material having substantially the same saturation magnetic flux density, and the inner peripheral area of the through hole of the yoke, and The radial cross-sectional area of the cylinder, characterized in that the above radial cross-sectional area of the rod located in the through-hole.

  According to a second aspect of the present invention, there is provided a water tank that houses a drum rotated by a motor, and a suspension that elastically supports the water tank. The suspension includes a cylinder and a bearing fixed inside the cylinder. A rod that is supported so as to be capable of reciprocating in the axial direction relative to the bearing, a magnetic flux generator that surrounds the rod and generates a magnetic flux, and generates the magnetic flux in the cylinder. A yoke which is fixedly positioned on both sides in the axial direction of the device and has a through hole into which the rod is inserted is formed in the center; a magnetorheological fluid filled between the rod and the yoke in the through hole; The maximum allowable magnetic flux number passing through the cylinder and the yoke is equal to or greater than the maximum allowable magnetic flux number passing through the rod.

  According to the first aspect of the present invention, the cylinder, the yoke, and the rod constituting the magnetic path in the suspension are made of a magnetic material having substantially the same saturation magnetic flux density, and the inner peripheral area of the through hole of the yoke, and The radial cross-sectional area of the cylinder was greater than or equal to the radial cross-sectional area of the rod located in the through hole. For this reason, the magnetic flux passing through the rod is not obstructed by the yoke or cylinder, and furthermore, the shape of the yoke and cylinder can be set based on the radial cross-sectional area of the rod, so that vibration during operation can be reduced. The damping force necessary for the suspension can be ensured, the weight of each member constituting the magnetic path in the suspension can be reduced, and the material can be saved.

  According to the second aspect of the present invention, the maximum allowable magnetic flux numbers that pass through the cylinder and the yoke are equal to or greater than the maximum allowable magnetic flux number that passes through the rod. For this reason, even if the saturation magnetic flux density of the cylinder, yoke, and rod constituting the magnetic path in the suspension is different, the magnetic flux passing through the rod is not hindered by the yoke or cylinder, and further, the saturation magnetic flux density of the rod Because the saturation magnetic flux density and shape of the yoke and cylinder can be set based on the radial cross-sectional area, the damping force necessary for the suspension that can reduce vibration during operation can be secured, and the magnetic path in the suspension Each component member can be reduced in weight and material can be saved.

The longitudinal cross-sectional view of the principal part which concerns on 1st Example of this invention Longitudinal side view showing a part of the entire drum type washing machine in a broken state Front view of internal structure of drum type washing machine Partially enlarged longitudinal sectional view of the main part Perspective view of upper yoke and lower yoke 4 is a cross-sectional plan view of the suspension shown by cutting and enlarging along lines X1-X1 and X2-X2 in FIG. Characteristic diagram showing the relationship between the magnitude of the vibration of the aquarium and the rotation speed of the drum FIG. 4 equivalent diagram according to the second embodiment of the present invention. The upper yoke and lower yoke which concern on 3rd Example of this invention are expanded and shown, (a) is a top view, (b) is a side view. FIG. 9 equivalent view of the fourth embodiment of the present invention. FIG. 9 equivalent diagram according to the fifth embodiment of the present invention. FIG. 9 equivalent diagram according to the sixth embodiment of the present invention. FIG. 9 equivalent diagram according to the seventh embodiment of the present invention.

(First embodiment)
A first embodiment of the present invention will be described below with reference to FIGS.
FIG. 2 is a longitudinal sectional side view showing a part of the entire drum type washing machine, and FIG. 3 is a front view of the internal structure of the drum type washing machine.

  An outer box 1 shown in FIG. 2 forms an outer shell of a drum type washing machine. A laundry doorway 2 is formed at a substantially central portion of the front surface portion (right side in FIG. 2) of the outer box 1, and a door 3 for opening and closing the doorway 2 is provided. 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 (left and right in FIG. 2), and is disposed on the bottom plate 1a of the outer box 1, in this case, as shown in FIG. 7 is elastically supported in an upwardly inclined shape. The detailed structure of the suspension 7 will be described later.

  As shown in FIG. 2, 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 of the rotor 8 a is connected to the inside of the water tank 6 via the bearing housing 9. Is inserted.

  A drum 10 is disposed inside the water tank 6. The drum 10 also has a cylindrical shape in which the axial direction is the front and rear, and 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 an upwardly 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 tank and the motor 8 functions as a drum driving device that rotates the drum 10.

2 and 3 show the rotation axis O of the drum 10, and the suspension 7 is located on both sides (left and right) sandwiching the rotation axis O of the drum 10 and below the water tank 6. .
As shown in FIG. 2, a large number of small holes 11 (only a part is shown) are formed in the entire circumferential side portion (body portion) of the drum 10. Each of the drum 10 and the water tub 6 has openings 12 and 13 on the front surface, 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 unit 17 is disposed above and in front of the back of the water tank 6. The drying unit 17 includes a dehumidifier 18, a blower 19, and a heating device 20, and dehumidifies the air in the water tank 6, and then heats the air to return to the water tank 6. Let things dry.

Here, the detailed structure of the suspension 7 will be described. FIG. 1 is a longitudinal sectional view of a suspension 7 which is a main part according to the first embodiment.
The suspension 7 includes a damper 21, and the damper 21 includes a rod 23 attached to an attachment plate 22 included in the bottom plate 1 a of the outer box 1 and a cylinder 25 attached to an attachment plate 24 included in the water tank 6. Yes.

  Specifically, the solid rod-like rod 23 having a uniform diameter is provided with a connecting portion 23a having a larger diameter than the other portions shown in FIG. 1 at the lower end thereof, and this connecting portion 23a is shown in FIG. As described above, the rod 23 is attached to the mounting plate 22 by fastening the nut 23 to the mounting plate 22 of the bottom plate 1a via an elastic seat plate 26 such as rubber. On the other hand, a connecting member 28 shown in FIG. 1 is provided at the upper end of the cylinder 25, and this connecting member 28 is connected to the mounting plate 24 of the water tank 6 via an elastic seat plate 29 and the like as shown in FIG. The cylinder 25 is configured to vibrate in the vertical direction (axial direction) together with the water tank 6 by fastening with the nut 30.

  As shown in FIG. 1, the cylinder 25 has a cylindrical shape with uniform inner and outer diameters and radial thicknesses. An end cover 31 is press-fitted and fixed to the upper end of the cylinder 25, and the upper part is slightly below the upper part. The bearing 32 is press-fitted and fixed. The end lid 31 is provided with a breathing hole (not shown) through which air enters and exits the cylinder 25.

  4 is a partially enlarged longitudinal sectional view of the suspension 7 which is a main part of the present embodiment, FIG. 5 is a perspective view of the upper yoke 35 and the lower yoke 36, and FIG. 6 is an X1-X1 line in FIG. It is a cross-sectional top view of the suspension 7 shown cut and expanded along line X2-X2. A magnetic circuit generator 33 is provided in the cylinder 25 just below the upper bearing 32, and the magnetic circuit generator 33 includes a magnetic flux generator 34, an upper yoke 35, and a lower yoke 36. The magnetic flux generator 34 is a so-called solenoid comprising a bobbin 34a and a coil 34b accommodated therein, and the bobbin 34a is press-fitted into the cylinder 25 and fixed.

  Both the upper yoke 35 and the lower yoke 36 have a disk shape with a uniform thickness, and through holes 35a and 36a (see FIGS. 4, 5, and 6) into which the rods 23 are inserted and inserted in the center. ) Are formed. The upper yoke 35 and the lower yoke 36 are fixedly pressed into the cylinder 25 at the upper surface portion and the lower surface portion of the magnetic flux generator 34, respectively.

  A seal member 37 is press-fitted and fixed in the cylinder 25 just below the lower yoke 36, and a lower bearing 38 is press-fitted and fixed in the cylinder 25 (lower end portion) just below the seal member 37. The lower bearing 38 and the upper bearing 32 are made of, for example, sintered oil-impregnated metal (so-called bearing alloy).

  On the other hand, the upper portion of the rod 23 penetrates the lower bearing 38, the seal member 37, the lower yoke 36, the magnetic flux generator 34, the upper yoke 35 and the upper bearing 32 so as to be relatively reciprocally movable in the axial direction. In this state, the entire rod 23 is supported by the upper bearing 32 and the lower bearing 38. The magnetic flux generator 34 is fixed in the cylinder 25 so as to surround the rod 23. Therefore, the outer peripheral surface of the rod 23 slides relative to the upper bearing 32 and the lower bearing 38, but the gaps g1, g2, and g3 with respect to the upper yoke 35, the magnetic flux generator 34, and the lower yoke 36, respectively. Have left over. Further, the sealing member 37 is in liquid-tight contact with the outer peripheral surface of the rod 23.

  The cylinder 25 is filled with a magnetorheological fluid (MR fluid) 39. The magnetorheological fluid 39 is sealed by the sealing member 37, is prevented from leaking downward from the damper 21, and is filled in the cylinder 25 at least beyond the upper end surface of the upper yoke 35. The magnetorheological fluid 39 has a viscosity characteristic that changes according to the strength of the magnetic flux. For example, the magnetic viscous fluid 39 is a mixture of oil and ferromagnetic particles such as iron and carbonyl iron. When the magnetic flux is applied, As the ferromagnetic particles form chain clusters, the apparent viscosity increases. The magnetorheological fluid 39 is filled between the outer peripheral surface of the rod 23 and the inner peripheral surfaces of the upper yoke 35, the magnetic flux generator 34, and the lower yoke 36 in a state where leakage is prevented. That is, the magnetorheological fluid 39 is filled in the gaps g1, g2, and g3.

  The rod 23 is provided with a spring seat 40 just above the connecting portion 23a, and a spring (compression coil spring) 41 is provided between the spring seat 40 and the lower bearing 38 so as to be extendable and contractible. Thus, the water tank 6 is elastically supported by the suspension 7.

  The cylinder 25, the upper yoke 35, the lower yoke 36, and the rod 23 are made of carbon steel such as S25C or S45C, which is a magnetic material, and the saturation magnetic flux density of these members constituting the magnetic circuit generator 33 is substantially the same. About 1.5T. The inner peripheral areas (shaded portions shown in FIG. 5) of the through holes 35a, 36a of the upper yoke 35 and the lower yoke 36 and the radial cross-sectional area of the cylinder 25 (the outermost hatched portions shown in FIG. 6) The radial cross-sectional area of the rod 23 located in the through holes 35a and 36a (the hatched portion in the central portion shown in FIG. 6) is set to be substantially the same.

Next, the effect | action which concerns on the said structure is described.
When the operation of the control device 5 is started based on the operation of the operation panel 4, the water tank 6 vibrates mainly in the vertical direction as the drum 10 containing the laundry is rotationally driven. The suspension 7 expands and contracts in response to the vertical vibration of the water tank 6, and the cylinder 25 integrally connected to the water tank 6 includes an upper bearing 32, an upper yoke 35, a magnetic flux generator 34, a lower yoke 36, a seal member 37, and Along with the lower bearing 38, the periphery of the rod 23 is vibrated in the vertical direction while expanding and contracting the spring 41.

  Thus, when the cylinder 25 vibrates vertically around the rod 23 with the above parts, the magnetorheological fluid 39 filled between the outer peripheral surface of the rod 23 and the parts has a viscous resistance. A damping force is applied to attenuate the amplitude of the water tank 6.

  At this time, when the coil 34b of the magnetic flux generator 34 is energized (DC current in this embodiment), magnetic flux is generated, the magnetic flux acts on the magnetic viscous fluid 39, and the viscosity of the magnetic viscous fluid 39 increases. That is, when the coil 34 b of the magnetic flux generator 34 is energized, the rod 23 -the magnetorheological fluid 39 (gap g1) -the upper yoke 35 -the cylinder 25 -the lower yoke 36 -the magnetorheological fluid 39 (gap g3) -the rod 23 A closed-loop magnetic circuit M (two-dot chain line shown in FIGS. 1 and 4) is formed, and the viscosity of each magnetorheological fluid 39 filled in the portion where the magnetic flux passes, particularly the gaps g1 and g3 having a high magnetic flux density, is greatly increased. The viscosity resistance increases greatly. Thus, by energizing the coil 34b of the magnetic flux generator 34, the viscous resistance (shearing force) of each of the magnetorheological fluids 39 filled in the gaps g1 and g3 is increased, and the damping force of the suspension 7 is increased.

  The magnetic flux generator 34 generates a magnetic flux according to the current value flowing through the coil 34b and controls the viscosity of the magnetorheological fluid 39. The generated magnetic flux can be varied according to the current value. The viscosity of can be controlled variably.

  FIG. 7 is a characteristic diagram showing the relationship between the magnitude of vibration of the water tank 6 containing the drum 10 and the rotational speed of the drum 10. The vibration of the drum type washing machine of the present embodiment is the largest when the rotation speed of the drum 10 is about 200 rpm (resonance rotation speed). During the dewatering operation of the drum type washing machine, when the rotational speed of the drum 10 increases or decreases to reach the resonant rotational speed, the water tank 6 resonates and the vibration becomes the largest. For this reason, by passing a current through the coil 34b of the magnetic flux generator 34 in the vicinity of the resonance rotational speed, the damping force of the suspension 7 is increased and the vibration of the water tank 6 is prevented from increasing. In the present embodiment, when the rotation speed of the drum 10 is within a predetermined range from 100 rpm to 300 rpm, a current is supplied to the coil 34 b to increase the damping force of the suspension 7 and suppress the vibration of the water tank 6.

  Note that, as described above, an example in which a current is passed through the coil 34b of the magnetic flux generator 34 when the rotational speed of the drum 10 is within a predetermined range has been shown, but the present invention is not limited to this, and the magnitude of the vibration of the water tank 6 is large. A current may be passed through the coil 34b when a certain threshold value is exceeded.

  Thus, in the drum type washing machine having the above-described configuration, the cylinder 25, the upper yoke 35, the lower yoke 36, and the rod 23 are made of magnetic materials having substantially the same saturation magnetic flux density. And the inner peripheral area (shaded part shown in FIG. 5) of each through-hole 35a, 36a of the upper yoke 35 and the lower yoke 36, and the radial direction cross-sectional area of the cylinder 25 (outermost hatched part shown in FIG. 6) are as follows. The cross-sectional area in the radial direction of the rod 23 located in the through holes 35a and 36a (the hatched portion at the center shown in FIG. 6) is set substantially the same. Therefore, the maximum allowable number of magnetic fluxes flowing through the cylinder 25, the upper yoke 35, the lower yoke 36, and the rod 23 are substantially the same.

  Therefore, the magnetic flux generated by the magnetic flux generator 34 and passing through the rod 23 is not hindered and reduced by the cylinder 25, the upper yoke 35, and the lower yoke 36, so that the magnetic flux generator 34 is efficient. A closed loop of magnetic flux can be generated, a damping force required for the suspension 7 can be secured, and useless materials are used for the upper yoke 35, the lower yoke 36, and the cylinder 25 that constitute the magnetic path in the suspension 7. This makes it possible to use an optimum material without reducing the weight and to reduce the weight of the material.

  The cylinder 25, the upper yoke 35, the lower yoke 36, and the rod 23 are made of a magnetic material having substantially the same saturation magnetic flux density, and the upper yoke 35 and the lower yoke 36 are not limited to the above-described embodiments. The inner peripheral area (shaded portion shown in FIG. 5) of each through-hole 35a, 36a and the radial sectional area of the cylinder 25 (outermost hatched portion shown in FIG. 6) are located in both through-holes 35a, 36a. You may set larger than the radial direction cross-sectional area (shaded part of the center part shown in FIG. 6) of the rod 23 to do.

  In this case, the maximum allowable magnetic flux number flowing through the upper yoke 35, the lower yoke 36, and the cylinder 25 is larger than the maximum allowable magnetic flux number flowing through the rod 23, and the magnetic flux generated by the magnetic flux generator 34 and passing through the rod 23 is 35, the lower yoke 36, and the cylinder 25 are not obstructed and do not decrease, so that the magnetic flux generator 34 can generate an efficient closed loop of magnetic flux.

  For this reason, the inner peripheral areas of the through holes 35a and 36a of the upper yoke 35 and the lower yoke 36 (shown in FIG. 5) with reference to the radial cross-sectional area of the rod 23 (hatched portion in the center shown in FIG. 6). And the radial cross-sectional area of the cylinder 25 (the hatched portion on the outermost periphery shown in FIG. 6) can be set, so that the damping force required for the suspension 7 can be secured and the magnetic path in the suspension 7 The upper yoke 35, the lower yoke 36, and the cylinder 25 that are formed can be reduced in weight and material can be saved without using unnecessary materials.

(Second Embodiment)
The second embodiment of the present invention will be described below with reference to FIG. FIG. 8 is a diagram corresponding to FIG. 4 according to the present embodiment. In the present embodiment, the first described above in that the magnetic saturation density of the cylinder 52, the upper yoke 53, the lower yoke 54, and the rod 55 constituting the magnetic circuit generator 51 is not composed of substantially the same magnetic material. Different from the embodiment. In addition, the same code | symbol is attached | subjected to the same part as the said 1st Example, and the detailed description is abbreviate | omitted. The magnetic circuit generator 51, the cylinder 52, the upper yoke 53, the lower yoke 54, the rod 55, the suspension 56 and the damper 57 are respectively the magnetic circuit generator 33, the cylinder 25, the upper yoke 35, and the lower yoke 36 according to the first embodiment. This corresponds to the rod 23, the suspension 7 and the damper 21, and has the same configuration and function. Hereinafter, for convenience of description, FIG. 2 and FIG. 3 are also referred to.

  In the drum type washing machine according to the present embodiment, the water tank 6 is elastically supported on the bottom plate 1a of the outer box 1 by a pair of left and right suspensions 56 in an upwardly rising inclination manner, as in the first embodiment. As in the first embodiment, the suspension 56 is located on both sides (left and right) sandwiching the rotational axis O of the drum 10 and below the water tank 6.

  The suspension 56 includes a damper 57, and the damper 57 includes a rod 55 attached to the attachment plate 22 included in the bottom plate 1 a of the outer box 1 and a cylinder 52 attached to the attachment plate 24 included in the water tank 6.

  The cylinder 52, the upper yoke 53, the lower yoke 54, the rod 55, and the magnetic flux generator 34 constitute a magnetic circuit generator 51. The cylinder 52 and the rod 55 are made of a carbon material such as S25C or S45C, which is a magnetic material, and the saturation magnetic flux density is about 1.5T. The upper yoke 53 and the lower yoke 54 are made of permendur which is a magnetic material. The saturation magnetic flux density of the permendur is about 2.4T.

  The maximum allowable magnetic flux m1 (wb) flowing through the upper yoke 53 and the lower yoke 54 is obtained by multiplying the inner peripheral area of each through hole 53a, 54a by the saturation magnetic flux density of the permendur (about 2.4T). Can do. The maximum allowable magnetic fluxes m2 (wb) and m3 (wb) flowing through the cylinder 52 and the rod 55 are the saturation magnetic flux density of carbon steel (approximately about the radial cross-sectional area of the cylinder 52 and the radial cross-sectional area of the rod 55, respectively. 1.5T).

  The inner circumferential areas of the through holes 53a and 54a of the upper yoke 53 and the lower yoke 54, the radial cross-sectional area of the cylinder 52, and the radial cross-sectional area of the rod 55 are substantially equal to each other. It is set to be.

Next, the effect | action which concerns on the structure of a present Example is described.
By energizing the coil 34 b of the magnetic flux generator 34, the rod 55 -magnetic viscous fluid 39 (gap g 1) -upper yoke 53 -cylinder 52 -lower yoke 54 -magnetic viscous fluid 39 (gap g 3) -closed loop magnetism of the rod 55. A circuit M ′ (two-dot chain line shown in FIG. 8) is formed, and the viscosity of each magnetorheological fluid 39 filled in the portion where the magnetic flux passes, particularly the gaps g1 and g3 having a high magnetic flux density, is greatly increased. Resistance increases greatly. Thus, when the coil 34b of the magnetic flux generator 34 is energized, the viscous resistance (shearing force) of each of the magnetorheological fluids 39 filled in the gaps g1 and g3 increases, so that the damping force of the suspension 7 increases.

Thus, in the drum type washing machine having the configuration of the present embodiment, the maximum allowable number of magnetic fluxes flowing through the cylinder 52, the upper yoke 53, the lower yoke 54, and the rod 55 are substantially the same.
For this reason, since the magnetic flux generated by the magnetic flux generator 34 and passing through the rod 55 is not hindered by the cylinder 52, the upper yoke 53, and the lower yoke 54 and does not decrease, the magnetic flux generator 34 is efficient. The magnetic circuit M ′ can be formed, the damping force necessary for the suspension 56 can be secured, and wasteful materials are used for the upper yoke 53, the lower yoke 54, and the cylinder 52 that constitute the magnetic path in the suspension 56. It is possible to use an optimal material without using it, and it is possible to reduce the weight and save the material.

  Further, by using a permendur with a high saturation magnetic flux density for the upper yoke 53 and the lower yoke 54, the volume of the upper yoke 53 and the lower yoke 54 can be reduced, and the first embodiment described above is applied. Compared with the upper yoke 35 and the lower yoke 36 made of carbon steel, the thickness of the upper yoke 53 and the lower yoke 54 made of the permendur according to the present embodiment can be reduced to about 62.5%. Therefore, it is possible to reduce the weight and material of the upper yoke 53 and the lower yoke 54 constituting the magnetic path in the suspension 56.

  Further, the present invention is not limited to the above-described embodiment, and the suspension 56 may be configured by using a cylinder 52 made of permendur. Further, the permendur is attached to the cylinder 52, the upper yoke 53, and the lower yoke 54. The suspension 56 may be configured using By forming the cylinder 52, the upper yoke 53, and the lower yoke 54 using permendur instead of carbon steel, the weight can be reduced and the material can be saved as compared with the case where these are formed of carbon steel. .

  Further, the inner circumferential area of each of the through holes 53a and 54a of the upper yoke 53 and the lower yoke 54 and the radial sectional area of the cylinder 52 are set so that m1 and m2 are larger than m3. You may set on the basis of. In this case, the magnetic flux generated by the magnetic flux generator 34 and passing through the rod 55 is not hindered by the upper yoke 53, the lower yoke 54, and the cylinder 52 and does not decrease. A circuit M ′ can be formed.

  Therefore, with reference to the radial cross-sectional area of the rod 55, the inner peripheral areas (shaded portions shown in FIG. 5) of the through holes 53a and 54a of the upper yoke 53 and the lower yoke 54, and the radial cut of the cylinder 52, respectively. Since the area can be set, a damping force necessary for the suspension 56 can be ensured, and useless materials are not used for the upper yoke 53, the lower yoke 54, and the cylinder 52 constituting the magnetic path in the suspension 56. Enables weight savings and material savings.

(Third embodiment)
A third embodiment of the present invention will be described below with reference to FIG. FIG. 9 is an enlarged view of the upper yoke 61 and the lower yoke 62 according to the present embodiment, where (a) is a plan view and (b) is a side view. In the present embodiment, the configurations of the upper yoke 61 and the lower yoke 62 are different from those of the first embodiment described above. Hereinafter, FIG. 4 is also referred to for convenience of explanation.

  Both the upper yoke 61 and the lower yoke 62 are made of the same material and have the same shape as the upper yoke 35 and the lower yoke 36, and through holes 61a and 62a (see FIG. ))). The upper yoke 61 and the lower yoke 62 are fixed by being pressed into the cylinder 25 at the upper surface portion and the lower surface portion of the magnetic flux generator 34, respectively, and constitute a part of a magnetic circuit generated in the cylinder 25.

  As shown in FIG. 9A, in the upper yoke 61 and the lower yoke 62, a plurality of (eight in the present embodiment) through small holes 61b and 62b are formed on the outer circumferences of the through holes 61a and 62a, respectively. . A plurality of through small holes are formed such that the sum of the cross-sectional areas of the cross sections cut along the straight line connecting the adjacent through small holes 61b and 62b is equal to or greater than the inner peripheral area of each of the through holes 61a and 62a. Holes 61b and 62b are formed.

Next, operations and effects relating to the configuration of this embodiment will be described.
The magnetic flux passing through the upper yoke 61 and the lower yoke 62 flows from the inner peripheral surface of the through hole 61a toward the outer peripheral surface of the upper yoke 61, and from the outer peripheral surface of the lower yoke 62 to the inner peripheral surface of the through hole 62a. It flows toward. A plurality of through holes 61a and 62b are arranged so that the sum of the cross-sectional areas of the cross sections cut along the straight line connecting the adjacent through holes 61b and 62b is equal to or greater than the inner peripheral area of each of the through holes 61a and 62a. Holes 61b and 62b are formed. Therefore, the magnetic flux passing through the upper yoke 61 and the lower yoke 62 is not obstructed by the plurality of small through holes 61b and 62b formed in the upper yoke 61 and the lower yoke 62, respectively, and does not decrease.

  That is, forming the plurality of small through holes 61b and 62b in the upper yoke 61 and the lower yoke 62, respectively, means that the upper yoke 61 and the lower yoke 62 have been stealed. It is possible to reduce the weight of the upper yoke 61 and the lower yoke 62 without reducing the magnetic flux flowing through.

  In contrast to the third embodiment, FIGS. 10 to 13 show fourth to seventh embodiments which are modifications of the third embodiment. Like the third embodiment, the fourth to seventh embodiments are different from the first embodiment described above in the configuration of upper yokes 71, 81, 91, 101 and lower yokes 72, 82, 92, 102, which will be described later. .

(Fourth embodiment)
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 10 is a view corresponding to FIG. 9 according to the present embodiment.

  As shown in FIG. 10, both the upper yoke 71 and the lower yoke 72 are made of the same material and have the same shape as the upper yoke 35 and the lower yoke 36, and are formed on the upper surface from the through holes 71a and 72a in the central portion toward the outer periphery. The taper surface which inclines below is formed. The outer peripheral areas of the upper yoke 71 and the lower yoke 72 are formed to be equal to or larger than the inner peripheral areas of the through holes 71a and 72a of the upper yoke 71 and the lower yoke 72, respectively.

Next, operations and effects relating to the configuration of this embodiment will be described.
The magnetic flux passing through the upper yoke 71 and the lower yoke 72 flows from the inner peripheral surface of the through hole 71a toward the outer peripheral surface of the upper yoke 71, and from the outer peripheral surface of the lower yoke 72 to the inner peripheral surface of the through hole 72a. It flows toward. The outer peripheral areas of the upper yoke 71 and the lower yoke 72 are formed to be equal to or larger than the inner peripheral areas of the through holes 71a and 72a of the upper yoke 71 and the lower yoke 72, respectively. For this reason, since the magnetic flux flowing through the upper yoke 71 and the lower yoke 72 is not blocked by the outer peripheral surfaces of the upper yoke 71 and the lower yoke 72 and the inner peripheral surfaces of the through holes 71a and 72a, the upper yoke 71, The magnetic flux passing through the lower yoke 72 is not reduced.

  That is, the portion removed to form the tapered surfaces of the upper yoke 71 and the lower yoke 72 becomes the portion provided with the stealing, and the upper flux without flowing through the upper yoke 71 and the lower yoke 72 is reduced. The yoke 71 and the lower yoke 72 can be reduced in weight.

(Fifth embodiment)
The fifth embodiment of the present invention will be described below with reference to FIG. FIG. 11 is a diagram corresponding to FIG. 9 according to the present embodiment.

  As shown in FIG. 11, the upper yoke 81 and the lower yoke 82 are both made of the same material and the same shape as the upper yoke 35 and the lower yoke 36, and two corresponding portions are cut out in a straight line parallel to each other at the central portions thereof. Through holes 81a and 82a are formed. The cross-sectional area (the rectangular area shown in FIG. 11B) cut at right angles to the longitudinal direction of the upper yoke 81 and the lower yoke 82 is half of the inner peripheral area of the through holes 81a and 82a. The dimension between the two sides 81b and 82b is set so as to be equal or greater.

Next, operations and effects relating to the configuration of this embodiment will be described.
The magnetic flux passing through the upper yoke 81 and the lower yoke 82 flows from the inner peripheral surface of the through hole 81a toward the circular arc surface forming the outer periphery of the upper yoke 81, and from the circular arc surface forming the outer periphery of the lower yoke 82 to the through hole. It flows toward the inner peripheral surface of 82a. The cross-sectional area (the rectangular area shown in FIG. 11B) cut at right angles to the longitudinal direction of the upper yoke 81 and the lower yoke 82 is half of the inner peripheral area of the through holes 81a and 82a. The dimension between two parallel sides 81b and 82b is set so as to be equal to or greater than that.

  For this reason, the cross section cut at right angles to the longitudinal direction of the upper yoke 81 and the lower yoke 82 and the inner peripheral surfaces of the through holes 81a and 82a block and reduce the magnetic flux flowing in the upper yoke 81 and the lower yoke 82. Therefore, the magnetic flux passing through the upper yoke 81 and the lower yoke 82 does not decrease.

  That is, the excised portions of the upper yoke 81 and the lower yoke 82 become portions where the stealing is provided, and the weight of the upper yoke 81 and the lower yoke 82 is reduced without reducing the magnetic flux flowing in the upper yoke 81 and the lower yoke 82. Make it possible.

(Sixth embodiment)
The sixth embodiment of the present invention will be described below with reference to FIG. FIG. 12 is a view corresponding to FIG. 9 according to the present embodiment.

  As shown in FIG. 12, the upper yoke 91 and the lower yoke 92 are both made of the same material and in the same shape as the upper yoke 35 and the lower yoke 36, and annular stepped portions 91b and 92b are formed on the outer peripheral side of the upper surface portion. The through holes 91a and 92a are formed in the central part, respectively. The outer peripheral areas of the upper yoke 91 and the lower yoke 92 are formed to be equal to or larger than the inner peripheral areas of the through holes 91a and 92a of the upper yoke 91 and the lower yoke 92, respectively.

Next, operations and effects relating to the configuration of this embodiment will be described.
Magnetic flux passing through the upper yoke 91 and the lower yoke 92 flows from the inner peripheral surface of the through hole 91a toward the outer peripheral surface of the upper yoke 91, and from the outer peripheral surface of the lower yoke 92 to the inner peripheral surface of the through hole 92a. It flows toward. The outer peripheral areas of the upper yoke 91 and the lower yoke 92 are formed to be equal to or larger than the inner peripheral areas of the through holes 91a and 92a of the upper yoke 91 and the lower yoke 92, respectively. For this reason, since the magnetic flux is not blocked and reduced by the outer peripheral surfaces of the upper yoke 91 and the lower yoke 92 and the inner peripheral surfaces of the through holes 91a and 92a, the magnetic flux passing through the upper yoke 91 and the lower yoke 92. Will not decrease.

  That is, even if the stealing is provided by the step portions 91b and 92b on the upper surfaces of the upper yoke 71 and the lower yoke 72, the magnetic flux flowing in the upper yoke 91 and the lower yoke 92 is not reduced, and the upper yoke 91 and the lower yoke 92 Enables weight reduction.

(Seventh embodiment)
A seventh embodiment of the present invention will be described below with reference to FIG. FIG. 13 is a diagram corresponding to FIG. 9 according to the present embodiment.

  Both the upper yoke 101 and the lower yoke 102 are made of the same material and have the same shape as the upper yoke 35 and the lower yoke 36, and through holes 101a and 102a are respectively formed in the central portions thereof. The upper yoke 101 and the lower yoke 102 are formed with substantially rectangular notches 101b and 102b on the outer periphery at intervals of approximately 90 degrees. The substantially rectangular notch so that the sum of the cross-sectional areas of the sections cut along the straight line connecting the adjacent approximately rectangular notches 101b and 102b is equal to or greater than the inner peripheral area of the through holes 101a and 102a, respectively. Portions 101b and 102b are formed.

Next, operations and effects relating to the configuration of this embodiment will be described.
Magnetic flux passing through the upper yoke 101 and the lower yoke 102 flows from the inner peripheral surface of the through hole 101a toward the outer peripheral surface of the upper yoke 101, and from the outer peripheral surface of the lower yoke 102 to the inner peripheral surface of the through hole 102a. It flows toward. The substantially rectangular notch portions so that the sum of the cross-sectional areas of the sections cut along the straight line connecting the adjacent substantially rectangular notch portions 101b and 102b is equal to or greater than the inner peripheral area of the through holes 101a and 102a, respectively. 101b and 102b are formed. Therefore, the magnetic flux passing through the upper yoke 101 and the lower yoke 102 is not obstructed by the substantially rectangular notches 101b and 102b formed in the upper yoke 101 and the lower yoke 102, respectively, and does not decrease.

  That is, forming the substantially rectangular notches 101b and 102b in the upper yoke 101 and the lower yoke 102, respectively, means that the upper yoke 101 and the lower yoke 102 have been stealed. The weight of the upper yoke 101 and the lower yoke 102 can be reduced without reducing the flowing magnetic flux.

  In addition, this invention is not limited to each above-mentioned embodiment, In the range which does not deviate from the summary of this invention, it can change suitably and can implement. For example, the third to seventh embodiments may be applied to the second embodiment. In the above-described embodiment, a direct current is passed through the coil 34b of the magnetic flux generator 34. However, a direct current in the direction opposite to that of the above-described embodiment may be passed, or an alternating current is used instead of the direct current. It may be flushed.

  In the drawing, 6 is a water tank, 7 and 56 are suspensions, 8 is a motor, 10 is a drum, 23 and 55 are rods, 25 and 52 are cylinders, 32 is an upper bearing (bearing), 34 is a magnetic flux generator, 35 and 53 , 61, 71, 81, 91, 101 are upper yokes (yokes), 35a, 61a, 71a, 81a, 91a, 101a are through holes, 36, 54, 62, 72, 82, 92, 102 are lower yokes (yokes). ), 36a, 62a, 72a, 82a, 92a, 102a are through holes, 38 is a lower bearing (bearing), and 39 is a magnetorheological fluid.

Claims (3)

A water tank containing a drum rotated by a motor;
A suspension that elastically supports this water tank,
The suspension is
A cylinder,
A bearing fixed inside the cylinder;
A rod pivotally supported so as to be capable of reciprocating in the axial direction relative to the bearing;
A magnetic flux generator that surrounds the rod and is provided inside the cylinder and generates a magnetic flux;
A yoke that is fixed to the cylinder on both sides in the axial direction of the magnetic flux generator, and a through hole into which the rod is inserted is formed in the center;
A magnetorheological fluid filled between the rod in the through hole and the yoke,
The cylinder, the yoke, and the rod are made of a magnetic material having substantially the same saturation magnetic flux density, and an inner peripheral area of the through hole of the yoke and a radial sectional area of the cylinder are within the through hole. A drum-type washing machine characterized by having a radial cross-sectional area greater than or equal to that of the rod. A water tank containing a drum rotated by a motor;
A suspension that elastically supports this water tank,
The suspension is
A cylinder,
A bearing fixed inside the cylinder;
A rod pivotally supported so as to be capable of reciprocating in the axial direction relative to the bearing;
A magnetic flux generator that surrounds the rod and is provided inside the cylinder and generates a magnetic flux;
A yoke that is fixed to the cylinder on both sides in the axial direction of the magnetic flux generator, and a through hole into which the rod is inserted is formed in the center;
A magnetorheological fluid filled between the rod in the through hole and the yoke,
The drum type washing machine, wherein the maximum allowable magnetic flux number passing through the cylinder and the yoke is equal to or greater than the maximum allowable magnetic flux number passing through the rod. The drum type washing machine according to claim 1 or 2, wherein a meat stealer capable of securing a cross-sectional area equal to or greater than an inner peripheral area of the through hole is provided in the yoke.

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