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A damper includes a bobbin which is housed in a cylinder and on which a coil is wound and yokes housed in the cylinder. At least one of the yokes is disposed at a first axial side of the bobbin, and at least one other of the yokes is disposed at a second axial side of the bobbin. A magnetic viscous

A damper includes a bobbin which is housed in a cylinder and on which a coil is wound and yokes housed in the cylinder. At least one of the yokes is disposed at a first axial side of the bobbin, and at least one other of the yokes is disposed at a second axial side of the bobbin. A magnetic viscous fluid is retained on inner surfaces of the yokes and an inner surface of the bobbin. Sealing members are configured to prevent leakage of the magnetic viscous fluid. A shaft extends through the yokes, the bobbin and the sealing members and is configured to be axially reciprocable relative to the yokes, the bobbin and the sealing members such that reciprocation of the shaft does not substantially displace the magnetic viscous fluid. The coil, the bobbin and the yokes are fixed together by a resin.

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1. A damper comprising: a cylinder;a bobbin which is housed in the cylinder and on which a coil generating a magnetic field is wound;a plurality of yokes housed in the cylinder, at least one of the plurality of yokes being disposed at a first axial side of the bobbin, and at least one other of the p

1. A damper comprising: a cylinder;a bobbin which is housed in the cylinder and on which a coil generating a magnetic field is wound;a plurality of yokes housed in the cylinder, at least one of the plurality of yokes being disposed at a first axial side of the bobbin, and at least one other of the plurality of yokes being disposed at a second axial side of the bobbin;a magnetic viscous fluid retained on inner surfaces of the plurality of yokes and an inner surface of the bobbin;a plurality of sealing members disposed in the cylinder axially outside the plurality of yokes, the sealing members configured to prevent leakage of the magnetic viscous fluid so that the magnetic viscous fluid is retained; anda shaft which extends through the yokes, the bobbin, and the sealing members and configured to be axially reciprocable relative to the yokes, the bobbin, and the sealing members such that reciprocation of the shaft does not substantially displace the magnetic viscous fluid;wherein the coil, the bobbin, and the yokes are fixed together by a resin. 2. The damper according to claim 1, wherein the resin is a thermoplastic resin. 3. The damper according to claim 1, wherein the bobbin includes an inner periphery provided with a molding surface molded from the resin. 4. The damper according to claim 1, wherein the bobbin includes an end plate and a leakproof portion provided between the end plate of the bobbin and the yoke located opposite the end plate to prevent the magnetic viscous fluid from leaking. 5. The damper according to claim 4, wherein the leakproof portion includes a labyrinth structure in which a plurality of protrusions is formed on an upper or lower surface of the end plate of the bobbin and on a lower or upper surface of the yoke located opposite the upper or lower surface of the end plate of the bobbin respectively so that the protrusions of the bobbin and the protrusions of the yoke are disposed alternately. 6. The damper according to claim 1, wherein the yoke includes an outer periphery formed with a groove, and the groove is filled with the resin. 7. The damper according to claim 1, wherein the coil includes a terminal to which a lead wire is connected, and the lead wire is supported by a supporting member made of the resin when drawn out of a molding surface molded from the resin. 8. The damper according to claim 7, wherein the cylinder includes a through hole and the lead wire is protected by a protecting component which is made of the resin and provided in the through hole of the cylinder through which the lead wire is drawn out of the cylinder. 9. The damper according to claim 1, wherein the bobbin includes an end plate including an upper or lower surface provided with an engaging portion, and the yoke includes a lower or upper surface located opposite the upper or lower surface of the endplate and provided with an engaged portion which is engaged with the engaging portion. 10. A washing machine which includes an outer casing, a first tub located in the outer casing, a rotating tub located in the first tub and configured to be rotatable, and a suspension elastically supporting the first tub in the outer casing and including a damper which damps vibration of the first tub, the damper comprising: a cylinder;a bobbin which is housed in the cylinder and on which a coil generating a magnetic field is wound;a plurality of yokes housed in the cylinder, at least one of the plurality of yokes being disposed at a first axial side of the bobbin, and at least one other of the plurality of yokes being disposed at a second axial side of the bobbin;a magnetic viscous fluid retained on inner surfaces of the plurality of yokes and an inner surface of the bobbin;a plurality of sealing members disposed in the cylinder axially outside the plurality of yokes, the sealing members configured to prevent leakage of the magnetic viscous fluid so that the magnetic viscous fluid is retained; anda shaft which extends through the yokes, the bobbin, and the sealing members and configured to be axially reciprocable relative to the yokes, the bobbin, and the sealing members such that reciprocation of the shaft does not substantially displace the magnetic viscous fluid;wherein the coil, the bobbin, and the yokes are fixed together by a resin. 11. The washing machine according to claim 10, wherein the bobbin includes an end plate and a leakproof portion provided between the end plate of the bobbin and the yoke located opposite the end plate to prevent the magnetic viscous fluid from leaking. 12. The washing machine according to claim 10, wherein the yoke includes an outer periphery formed with a groove, and the groove is filled with the resin. 13. The washing machine according to claim 10, wherein the coil includes a terminal to which a lead wire is connected, and the lead wire is supported by a supporting member made of the resin when drawn out of a molding surface molded from the resin. 14. The washing machine according to claim 13, wherein the cylinder includes a through hole and the lead wire is protected by a protecting component which is made of the resin and provided in the through hole of the cylinder through which the lead wire is drawn out of the cylinder. 15. The washing machine according to claim 10, wherein the bobbin includes an end plate including an upper or lower surface provided with an engaging portion, and the yoke includes a lower or upper surface located opposite the upper or lower surface of the end plate and provided with an engaged portion which is engaged with the engaging portion. 16. A washing/drying machine which includes an outer casing, a first tub located in the outer casing, a rotating tub located in the first tub and configured to be rotatable, a suspension elastically supporting the first tub in the outer casing and including a damper which damps vibration of the first tub, a heater generating hot air, and a blower supplying hot air into the rotating tub, the damper comprising: a cylinder;a bobbin which is housed in the cylinder and on which a coil generating a magnetic field is wound;a plurality of yokes housed in the cylinder, at least one of the plurality of yokes being disposed at a first axial side of the bobbin, and at least one other of the plurality of yokes being disposed at a second axial side of the bobbin;a magnetic viscous fluid retained on inner surfaces of the plurality of yokes and an inner surface of the bobbin;a plurality of sealing members disposed in the cylinder axially outside the plurality of yokes, the sealing members configured to prevent leakage of the magnetic viscous fluid so that the magnetic viscous fluid is retained; anda shaft which extends through the yokes, the bobbin, and the sealing members and configured to be axially reciprocable relative to the yokes, the bobbin, and the sealing members such that reciprocation of the shaft does not substantially displace the magnetic viscous fluid;wherein the coil, the bobbin, and the yokes are fixed together by a resin. 17. A damper comprising: an outer cylinder;an inner cylinder housed in the outer cylinder;a coil housed in the inner cylinder and configured to generate a magnetic field;a magnetic viscous fluid filling a gap defined inside the coil in the inner cylinder;a plurality of sealing members disposed in the inner cylinder axially outside the coil, the sealing members being configured to prevent leakage of the magnetic viscous fluid so that the magnetic viscous fluid is retained; anda shaft which extends through the inner cylinder, the coil, and the sealing members and is configured to be axially reciprocable relative to the inner cylinder, the coil, and the sealing members such that reciprocation of the shaft does not substantially displace the magnetic viscous fluid. 18. The damper according to claim 17, wherein: the coil includes two coils;three yokes provided on ends of the coils; andthe first yoke, the first coil, the second yoke, the second coil and the third yoke are disposed axially sequentially in the inner cylinder; andthe sealing members are located axially outside the first and third yokes respectively. 19. The damper according to claim 17, further comprising: a spring seat provided on a part of the shaft protruding outside the outer cylinder; anda coil spring provided between the spring seat and an end of the outer cylinder so as to surround the shaft. 20. The damper according to claim 17, further comprising: a groove formed in an outer periphery of the inner cylinder so as to axially extend along the inner cylinder, the groove accommodating a lead wire drawn out of the coil; anda hole formed through a peripheral wall of the outer cylinder, wherein the lead wire is inserted through the hole.