JP2011231889A - Bearing with magnetic fluid seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing with a magnetic fluid seal enabling space saving, high flexibility in material selection, and superior installability (workability).SOLUTION: The bearing 30 with a magnetic fluid seal includes: a bearing body 32 including an inner ring 31, a retainer 33 placed outside the inner ring 31, a rolling element 35 held by the retainer 33, and an outer ring 36 placed outside the retainer; and a magnetic fluid seal 34 integrally held by the bearing body 32 and forming a magnetic circuit with the inner ring 31 consisting of a magnetic material to seal the inside of the bearing body 32. The magnetic fluid seal 34 includes: a magnet 39 for forming a magnetic circuit with the inner ring 31; a pair of plates 37, 38 for holding the magnet 39 from both sides; and magnetic fluid 40 held between the inner ring 31 and the plates 37, 38.

Description

  The present invention relates to a bearing provided with a magnetic fluid seal, and more specifically, a magnetic unit comprising a bearing body such as a ball bearing and a magnetic fluid seal for sealing the inside of the bearing body to the outside. The present invention relates to a bearing with a fluid seal.

  Conventionally, a magnetic seal mechanism using a magnetic fluid is known. Such a magnetic seal mechanism is used in various fields. For example, in Patent Document 1, the magnetic seal mechanism is applied to a fishing reel. Specifically, in Patent Document 1, seawater, sand, foreign matter, and the like adhere to a ball bearing that rotatably supports a drive shaft (spool shaft) that is rotationally driven in accordance with a rotation operation of a handle for winding a fishing line. The magnetic fluid is held between the magnetic holding ring and the drive shaft that constitute the magnetic circuit so that the magnetic bearing ring does not fall into or get into the water (that is, the rotation performance of the ball bearing is not reduced by waterproofing and dustproofing). A magnetic seal mechanism is provided in the vicinity of the ball bearing.

JP 2003-319742 A

  However, in Patent Document 1, since a magnetic seal mechanism separate from the bearing is provided close to the bearing, a space for sealing is required in addition to the installation space of the bearing, as in the case of a conventional elastic seal or the like. . In particular, since fishing reels have a large number of bearings, if a magnetic seal mechanism is provided for each of these bearings, the entire reel is increased in size. Further, since it is necessary to assemble a magnetic seal mechanism separately from the assembling of the bearing, the assembling property is poor, laborious, and the productivity is not good (that is, the assembling work time is increased and the manufacturing cost is increased). Furthermore, in Patent Document 1, since the magnetic fluid is placed in direct contact with the drive shaft, the drive shaft must be formed of a magnetic material, and the degree of freedom in selecting the material for the drive shaft is limited. That is, options for satisfying the required quality required for the drive shaft are limited. Further, the above is a problem that occurs not only in fishing reels but also in various waterproof articles.

  The present invention has been made by paying attention to the above-mentioned circumstances, and the object is to save space, to have a high degree of freedom in material selection, and to a magnetic property with good assemblability (workability). It is to provide a bearing with a fluid seal.

  In order to solve the above-mentioned problem, a bearing with a magnetic fluid seal according to claim 1 includes an inner ring, a cage disposed outside the inner ring, a rolling element held by the cage, and the cage. A magnetic body is formed between the bearing main body composed of an outer ring arranged on the outer side of the bearing and the inner ring or the outer ring made of a magnetic material, which is integrally held by the bearing main body, and seals the inside of the bearing main body. A magnetic fluid seal, wherein the magnetic fluid seal includes a magnet that forms a magnetic circuit with the inner ring or the outer ring, a pair of electrode plates that hold the magnet from both sides, the inner ring or the outer ring, and the It consists of a magnetic fluid held between electrode plates.

  According to the bearing with a magnetic fluid seal according to the first aspect of the present invention, the bearing main body and the magnetic fluid seal for sealing the inside of the bearing main body with respect to the outside are integrally formed as a unit. Apart from this, it is not necessary to secure a space for sealing. Therefore, a seal and a bearing can be installed in a small space, and space saving can be achieved. In addition, since it is not necessary to assemble a magnetic seal mechanism separately from the incorporation of the bearing, the assemblability (workability) is good and the productivity can be improved (that is, the assembly work time can be shortened and the manufacturing cost can be reduced). Furthermore, in this configuration, the magnetic fluid seal does not form a magnetic circuit with other members other than the bearing body, but forms a magnetic circuit with the inner ring or the outer ring of the bearing body. The degree of freedom in selecting the material of the member is not limited, and free material selection that satisfies the required quality required for the other member can be ensured (the optimum material for the other member can be selected).

  The bearing with a magnetic fluid seal according to claim 2 is the bearing with a magnetic fluid seal according to claim 1, further comprising holding means for holding the magnetic fluid seal on the bearing body. To do.

  According to the bearing with a ferrofluid seal according to the second aspect, it is possible to obtain the same operation effect as the bearing with the ferrofluid seal according to the first aspect and to ensure integration of the bearing body and the ferrofluid seal. This can improve the handleability of the bearing with a magnetic fluid seal.

  The bearing with a magnetic fluid seal according to claim 3 is the bearing with a magnetic fluid seal according to claim 1 or 2, wherein one axial length of the inner ring or the outer ring is the other axial length. In the seal housing space formed in the bearing body by being set shorter than the above, the magnetic fluid seal is in a state in which its pole plate abuts against one end face of the inner ring or the outer ring in the axial direction. And is incorporated so as to face the other inner surface in the radial direction.

  According to the bearing with a magnetic fluid seal according to the third aspect, the same effect as that of the bearing with the magnetic fluid seal according to the first or second aspect can be obtained, and one axial direction of the inner ring or the outer ring can be obtained. By setting the length shorter than the other axial length, the magnetic fluid seal is incorporated in the seal housing space formed in the bearing body, that is, in the bearing body. Thus, the integration of the bearing body and the magnetic fluid seal can be realized without increasing the size of the entire bearing. In addition, the magnetic fluid seal is incorporated so as to face the other inner surface in the radial direction in a state where the electrode plate is in axial contact with one end face of the inner ring or the outer ring. The end face and the inner face can be used for holding the electrode plate and holding the magnetic fluid, and holding the magnetic fluid seal can be realized in a lump in the seal housing space. That is, the efficient and effective use of the space can realize the integration and miniaturization of the bearing body and the magnetic fluid seal in a simple form. Further, since the magnetic fluid is held inside the bearing body, there is no possibility that the magnetic fluid leaks outside.

  The bearing with a magnetic fluid seal according to claim 4 is the bearing with a magnetic fluid seal according to any one of claims 1 to 3, wherein the cage serves as one of the electrode plates. Features.

  According to the bearing with a magnetic fluid seal according to claim 4, the same effect as that of the bearing with a magnetic fluid seal according to any one of claims 1 to 3 can be obtained, and the cage is Since it also serves as one of the electrode plates, it is possible to further reduce the number of parts and further promote downsizing.

  The invention according to claim 5 is a fishing reel in which a fishing line is wound around a spool supported by the reel body by a rotating operation of a handle connected to a winding drive mechanism built in the reel body. The drive shaft that is rotationally driven by the operation of the handle is rotatably supported by the magnetic fluid seal bearing according to any one of claims 1 to 4.

  According to the invention described in claim 5, even in a fishing reel having a large number of bearings and a high necessity for sealing, it is not necessary to provide a magnetic seal mechanism separately from the bearing, and the entire reel can be reduced in size. Can be achieved. In addition, for the reasons described above, it is possible to improve the ease of assembling the reel, and it is not necessary to form the drive shaft with a magnetic material, and the degree of freedom in selecting the material for the drive shaft is increased. Furthermore, when a bearing with a magnetic fluid seal is provided on the spool shaft, it is possible to provide a hole in the spool because it is waterproof, and the moment of inertia around the spool shaft of the spool can be reduced by reducing the weight due to the hole. The spool-free performance can be improved by a synergistic effect with the decrease in rotational resistance by the magnetic fluid seal.

  According to the present invention, a bearing with a magnetic fluid seal that can save space, has a high degree of freedom in material selection, and has good assemblability (workability) can be provided.

1 is a cross-sectional view of a fishing reel (double bearing type reel) including a bearing with a magnetic fluid seal according to an embodiment of the present invention. It is an expanded sectional view of the principal part of the fishing reel of FIG. (A) is an enlarged sectional view of part A in FIG. 1, (b) is an enlarged sectional view showing a first modification of (a), and (c) is an enlarged section showing a second modification of (a). FIG. 4D is an enlarged sectional view of a portion B in FIG. It is sectional drawing of a fishing reel (spinning reel) provided with the bearing with a magnetic fluid seal concerning one Embodiment of this invention. It is sectional drawing which follows the CC line of FIG. It is a principal part expanded sectional view of FIG.

  Hereinafter, a magnetic fluid seal bearing according to the present invention will be described in detail with reference to the accompanying drawings. In the following, a case where a magnetic fluid seal bearing is applied to a fishing reel will be described as an example. However, the magnetic fluid seal bearing according to the present invention can be applied to all articles that require waterproofing and dustproofing. Needless to say.

  1 to 3 show a first embodiment of the present invention in which a bearing with a magnetic fluid seal is applied to a fishing reel. FIG. 1 is a cross-sectional view of a dual-bearing type reel as a fishing reel including a magnetic fluid seal bearing according to an embodiment of the present invention. As shown in the figure, a reel body 1 of a dual-bearing type reel includes left and right frames 2a and 2b and left and right side plates 3a and 3b mounted on the left and right frames 2a and 2b with a predetermined space. Between the left and right frames 2a and 2b (left and right side plates 3a and 3b), a spool shaft 5 as a drive shaft is rotatably supported via bearings 30 and 30A with magnetic fluid seals according to the present embodiment (FIG. 2). Further, a spool 6 around which a fishing line is wound is attached to the spool shaft 5.

  A handle shaft 9 on which a handle 8 is mounted is rotatably supported on the right side plate 3b side. A winding drive mechanism is connected to the handle shaft 9, and the spool 6 is driven to rotate through the winding drive mechanism by rotating the handle 8. The handle shaft 9 can be rotated only in the fishing line winding direction by a one-way clutch 10 interposed between the handle shaft 9 and the right side plate.

  The winding drive mechanism includes a drive gear 12 that is rotatably supported on the handle shaft 9 via a drag mechanism, and a pinion 13 that meshes with the drive gear 12. The pinion 13 is rotatably supported via a bearing 82 and is configured to be connected to and disconnected from the spool shaft 5 via a known clutch mechanism. In the clutch ON state, the rotational driving force of the handle 8 is set. Is transmitted to the spool 6 via the drive gear 12 and the pinion 13, and in the clutch-off state, the drive force transmission state is canceled and the spool 6 is brought into a free rotation state. The clutch operation described above is performed by operating an operation lever (not shown) protruding from the reel body 1.

  A level wind mechanism 20 is provided in front of the spool 6 between the left and right plates 3a and 3b. The level wind mechanism 20 reciprocates left and right in front of the spool 6 and is supported between a fishing line guide 21 having an insertion hole through which a fishing line is inserted and the left and right side plates 3a and 3b, and an endless cam groove 23a on the outer periphery. The worm shaft 23 is formed.

  The worm shaft 23 is rotatably supported between the left and right frames via a bearing 80 and is rotatably accommodated in a cylindrical member 25 in which a through hole is formed along the axial direction. The engagement pin held by the fishing line guide body 21 is engaged with the endless cam groove 23a to reciprocate the fishing line guide body 21 left and right. Further, the fishing line guide 21 is supported by a guide pillar (not shown) supported between the left and right frames so as to be prevented from rotating around the worm shaft 23 when reciprocating.

  A gear 90 that meshes with a gear 12 a that is connected to the drive gear 12 in the axial direction so as to rotate together with the drive gear 12 is provided at the end on the right side plate side of the worm shaft 23. The gear 90 is inputted with a rotational driving force by a winding operation of the handle 8 via the handle shaft 9, the driving gear 12 and the gear 12 a, and the rotational driving force is outputted to the worm shaft 23. .

  Further, in the present embodiment, the right side plate 3b of the reel body 1 has a concave recess 50 in which the handle shaft 9 as a drive member that rotates in conjunction with the operation of the handle 8 is partially received and supported by the bearing 49. Is formed. The accommodation recess 50 accommodates and holds the one-way clutch 10 of the above-described reverse rotation prevention mechanism in a positioned state (the reverse rotation prevention mechanism is provided in the accommodation recess 50).

  Further, in this configuration, an operating body 71 constituting a known drag mechanism 70 is screwed to the right end portion of the handle shaft 9. When the operating body 71 is rotated, the first pressing body 73, which is a collar member that is fitted to the handle shaft 9 so as to be axially movable and integrally rotatable, moves in the axial direction, via the disc spring 75. Then, the second pressing body 77 serving also as the inner ring of the one-way clutch 10 is pressed, the friction member 78 is pressed with a desired pressing force, and a braking force is generated between the handle shaft 9 and the gear 12a.

  Next, referring to FIG. 3, the magnetic fluid seal bearings 30 and 30A according to this embodiment for rotatably supporting the spool shaft 5 will be described in detail. Here, (a) in FIG. 3 is an enlarged sectional view of a part A in FIG. 1, (b) is an enlarged sectional view showing a first modification of (a), and (c) is a second sectional view of (a). The expanded sectional view which shows a modification, (d) is an expanded sectional view of the B section of FIG.

  As shown in FIG. 3A, the first bearing 30 with a magnetic fluid seal that rotatably supports the left end portion of the spool shaft 5 includes a bearing body 32 and a magnetic material that seals the inside of the bearing body 32. And a fluid seal 34, which are configured as an integral unit. The bearing body 32 includes an inner ring 31 made of a magnetic material that fits to and supports the outer peripheral surface of the spool shaft 5, a retainer 33 that is disposed outside the inner ring 31, and a rolling element that is retained by the retainer 33. 35 and an outer ring 36 disposed outside the retainer 35. On the other hand, the magnetic fluid seal 34 is held integrally with the bearing body 32 and forms a magnetic circuit with the inner ring 31 to seal the inside of the bearing body 32. Specifically, the magnetic fluid seal 34 is arranged so as to surround the inner ring 31 with a predetermined gap, and forms a magnetic circuit between the inner ring 31 and the magnet 39 on both sides. And a magnetic fluid 40 held between the inner ring 31 and each of the pole plates 37, 38.

  In the present embodiment, the magnetic fluid seal 34 is incorporated in a seal housing space S that is efficiently and effectively formed in the bearing body 32. Specifically, in the present embodiment, the axial length of the outer ring 36 (the axial direction is indicated by an arrow P in FIG. 3A) is set shorter than the axial length of the inner ring 31. In the seal housing space S formed in a stepped shape in the bearing body 32 by such dimension setting, the magnetic fluid seal 34 has one electrode plate 37 applied to the side end surface 36a of the outer ring 36 in the axial direction. In a state where both the electrode plates 37 and 38 are in contact with each other and the inner surface 31a of the inner ring 31 (the surface facing the rolling element 35) is opposed in the radial direction, the entire plate (the magnet 39 and both electrode plates 37 and 38). Are incorporated so as to completely fit in the seal housing space S. Therefore, in this arrangement, the magnetic fluid 40 held between the inner ring 31 and each of the electrode plates 37 and 38 comes into contact with the inner surface 31 a of the inner ring 31. As described above, holding the magnetic fluid 40 on the inner ring 31 side instead of the outer ring 36 side reduces the amount of the magnetic fluid 40 used in view of the fact that the outer diameter of the inner ring 31 is smaller than that of the outer ring 36. This is preferable.

Here, the pole plates 37 and 38 hold the ring-shaped magnet 39 while holding the ring-shaped magnet 39 so that a recess 41 is formed along the circumferential direction on the inner side and the magnetic fluid 40 between the inner ring 31 and the inner ring 31a. It arrange | positions so that the slight clearance gap G for hold | maintaining may be ensured. In this case, a waterproof O-ring 92 is interposed between the magnet 39 and the left side plate 3a. Further, as indicated by the phantom line in FIG. 3A, an O-ring 93 may be separately disposed inside the inner ring 31, but normally, the space between the spool shaft 5 and the bearing is highly accurate. Since it is assembled, it is often unnecessary to provide the O-ring 93. Further, the inner ring 31 as a magnetic body is formed of an iron-based material, for example, steel, SUS430 (JIS), SUS440C (JIS), SUS630 (JIS), and the like. A magnetic circuit is formed between the pole plates 37 and 38 and the inner ring 31 to be formed. The axial length of the facing portion of the inner ring 31 facing the electrode plates 37 and 38 is long enough to generate the magnetic circuit (long enough to stably hold the magnetic fluid 40). The electrode plates 37 and 38 are preferably formed to be slightly longer than the axial length of the electrode plates 37 and 38 so that the electrode plates 37 and 38 are covered. Further, the magnetic fluid 40 is formed by dispersing magnetic fine particles such as Fe ₃ O ₄ in a surfactant and base oil, and has a characteristic of reacting when the magnet is brought close to the magnet. . Therefore, as shown in FIG. 3A, the magnetic fluid 40 is placed in the gap G by the magnetic circuit formed by the magnet 39, the electrode plates 37 and 38 holding the magnet 39, and the inner ring 31. The bearing body 32 is securely held and securely seals the inside of the bearing body 32 from the outside.

  In addition, as a holding means for holding the magnetic fluid seal 34 on the bearing main body 32, various means such as adhesion, welding, and other holding members can be considered. For example, the electrode plates 37 and 38 may be bonded to the outer ring 36 and the left side plate 3a, or a press-fit support by an O-ring 92 or a retaining ring may be used.

  FIG. 3B shows a first modification of the bearing 30 with a magnetic fluid seal. As shown in the figure, in the bearing 30 ′ with a magnetic fluid seal according to this modification, the retainer 33 serves as one electrode plate 37 and the inner ring 31 so that the number of parts can be further reduced to further reduce the size. 3 is set to be shorter than the case of FIG. 3A (so that it substantially matches the axial length of the outer ring 36) (generally, the material of the cage is a non-magnetic material). In many cases, SUS304 (JIS) is used, but in this case, the cage needs to be made of a magnetic material. For example, SUS403 (JIS) or SPCC (JIS) is preferably used. Accordingly, the magnetic fluid 40 is held between the portion of the cage 33 that also serves as one of the electrode plates 37 and the inner surface 31a of the inner ring 31, and the radially inner end of the other electrode plate 38 is pivoted. The magnetic fluid 40 is held between the side surface 31 b and the end surface of the bent end portion 38 a of the electrode plate 38. In such a configuration, it is possible to ensure a large width of the magnet 39 in the same bearing dimensions as in FIG. 3A, or to reduce the size (space saving) of the entire bearing 30 ′. .

  FIG. 3C shows a second modification of the bearing 30 with a magnetic fluid seal. This second modification is a further modification of the first modification. That is, as shown in the drawing, in the bearing 30 ″ with a magnetic fluid seal according to this modification, the portion of the cage 33 that also serves as one electrode plate 37 is the case of FIG. 3B (or the other of the cage 33). (A larger dimension in the axial direction), so that a sufficient amount of magnetic fluid 40 can be held between the retainer 33 and the inner surface 31a of the inner ring 31. The rest of the configuration is the same as the magnetic fluid seal bearing 30 ′.

  As shown in FIG. 3 (d), the bearing 30A with the second magnetic fluid seal that rotatably supports the right end of the spool shaft 5 is in addition to the configuration of the bearing 30 with the second magnetic fluid seal. Furthermore, a holding body 97 that is fitted on the outer periphery of the outer ring 36 is provided. The holding body 97 extends in the axial direction longer than the outer ring 36 on the magnetic fluid seal 34 side, and the magnetic fluid seal 34 is removed from the bearing body 32 in the groove 98 on the inner surface of the extending portion 97a. A hexagonal ring (holding means) 99 is attached to prevent this (holding the magnetic fluid seal 34 against the bearing body 32). By such a holding means 99, the integration of the bearing body 32 and the magnetic fluid seal 34 can be ensured, and the handleability of the bearing 30A with a magnetic fluid seal is improved. A waterproof O-ring 96 is interposed between the outer peripheral surface of the holding body 97 and the right frame 2b.

  As described above, according to the bearing 30 (30 ′, 30 ″), 30A with a magnetic fluid seal of the present embodiment, the bearing main body 32 and the magnetic fluid seal 34 for sealing the inside of the bearing main body 32 to the outside. Since the unit is integrated into a unit, there is no need to secure a seal space separately from the bearing installation space, so that the seal and the bearing can be installed in a small space, thereby saving space. In addition, since it is not necessary to assemble a magnetic seal mechanism separately from the incorporation of the bearing, the assemblability (workability) is good and the productivity can be improved (that is, the assembly work time can be shortened and the manufacturing cost can be reduced). Further, in the present embodiment, the magnetic fluid seal 34 forms a magnetic circuit with other members (such as the spool shaft 5) other than the bearing body 32. However, since a magnetic circuit is formed with the inner ring 31 of the bearing body 32, the degree of freedom in selecting the material of the other member is not limited, and a free material that satisfies the required quality required for the other member. Selection can be ensured (the material most suitable for the other member can be selected).

  Further, in the bearings 30 and 30 </ b> A with magnetic fluid seals of the present embodiment, the seal accommodation space S formed in the bearing body 32 by setting the axial length of the outer ring 36 shorter than the axial length of the inner ring 31. Since the magnetic fluid seal 34 is incorporated in the inside of the bearing body 32, the bearing body 32 and the magnetic body 32 are magnetic without increasing the size of the bearing body 32 or increasing the overall size of the bearings 30 and 30A. Integration with the fluid seal 34 can be realized. The magnetic fluid seal 34 is in a state in which one of the pole plates 37 is in axial contact with the side end surface 36a of the outer ring 36, and both the pole plates 37 and 38 are connected to the inner surface 31a (the rolling element 35 and Since the entire surface (the entire surface including the magnet 39 and both electrode plates 37 and 38) is completely fitted in the seal housing space S in a state of being opposed to the opposite surface) in the radial direction, the inner ring 31 and The end face and the inner surface of the outer ring 36 can be used for holding the electrode plates 37 and 38 and the magnetic fluid 40, and the magnetic fluid seal 34 can be held collectively in the seal housing space S. That is, the efficient and effective use of the space enables the integration and miniaturization of the bearing body 32 and the magnetic fluid seal 34 to be realized in a simple form. Furthermore, since the magnetic fluid 40 is held inside the bearing body 32, there is no possibility that the magnetic fluid 40 leaks outside.

  Further, in this embodiment, the bearings 30 (30 ′, 30 ″), 30A with magnetic fluid seals are applied to the fishing reel, so that the number of bearings is generally large and the need for sealing is high. Also in the reel, it is not necessary to provide a magnetic seal mechanism separately from the bearing, so that the entire reel can be reduced in size. When a bearing with a magnetic fluid seal is provided on the spool shaft, it is possible to provide a hole in the spool because it is waterproof, and by reducing the weight due to the hole, the moment of inertia around the spool shaft of the spool can be reduced, Spool-free performance can be improved by a synergistic effect with a decrease in rotational resistance due to the magnetic fluid seal.

  In the present embodiment, the magnetic fluid seal bearings 30 and 30A that rotatably support the spool shaft 5 have been described. However, the worm shaft 23, the handle shaft 9, and the pinion 13 as other drive shafts are rotated. The bearings 49, 80, and 82 that can be supported may also be configured as bearings 30 and 30A with magnetic fluid seals. In the above description, the inner ring 31 is formed of a magnetic material and forms a part of the magnetic circuit of the magnetic fluid seal 34. However, the outer ring 36 is formed of a magnetic material and the magnetic circuit of the magnetic fluid seal 34 is formed. A part may be formed.

  4 to 6 show a second embodiment of the present invention in which a bearing with a magnetic fluid seal is applied to a fishing reel. In this embodiment, a bearing with a magnetic fluid seal is applied to a spinning reel. Specifically, as shown in the drawing, a reel body 101 of a spinning reel is integrally formed with a reel leg 102 to be attached to a fishing rod, and a rotor 103 rotatably supported in front of the reel leg 102 and a rotor 103 A spool 104 supported so as to be able to move back and forth in synchronism with the rotational movement is provided.

  The rotor 103 includes a pair of arm portions 103a that rotate around the spool 104, and a bail support member 103c having a base end portion of the bail 103b attached to each front end portion of each arm portion 103a is used for winding a fishing line. It is rotatably supported between the position and the fishing line discharge position. Note that one base end portion of the bail 103b is attached to a fishing line guide portion 103d provided integrally with the bail support member 103c.

  In the reel body 101, a handle shaft 105 is rotatably supported via a pair of bearings 140 (see FIG. 5) on both sides, and a handle 106 is attached to the protruding end portion. The handle shaft 105 is engaged with a take-up drive mechanism. The take-up drive mechanism engages with the drive gear 107 and a drive gear 107 mounted on the handle shaft 105 so as to be integrally rotatable. A pinion 108 extending in a direction orthogonal to the handle shaft 105 and having a hollow portion extending in the axial direction therein is provided.

  The pinion 108 is rotatably supported in the reel main body 101 via a bearing 109, and extends toward the spool 104, and a rotor 103 is attached to the tip end portion thereof.

  Further, the pinion 108 is provided with a rolling one-way clutch 110 at an intermediate portion thereof, and the one-way clutch 110 is operated by rotating a switching operation lever provided outside the reel body 101. A known reverse rotation prevention mechanism (stopper) for preventing reverse rotation of the handle 106 (rotor 103) in the fishing line feeding direction is configured.

  A spool shaft 112 that extends in a direction orthogonal to the handle shaft 105 and is fitted with a spool 104 on the tip side is inserted into the hollow portion formed inside the pinion 108 so as to be movable in the axial direction. Further, a known spool reciprocating device 113 for reciprocating the spool 104 (spool shaft 112) back and forth is engaged with the pinion 108.

  In the fishing spinning reel having such a configuration, when the winding operation is performed by the handle 106, the rotor 103 is driven to rotate through the winding drive mechanism, and the spool 104 is moved through the spool reciprocating device 113. Since it is reciprocated back and forth, the fishing line is evenly wound around the winding drum portion 104a of the spool 104 via the fishing line guide portion 103d.

  In this embodiment, the bearing 140 that rotatably supports the handle shaft 105 is configured as a magnetic fluid seal bearing. That is, as clearly shown in FIG. 6, the bearing 140 has the same structure as the magnetic fluid seal bearing 30 described above. In addition, not only the bearing 140 but other bearings including the bearing 109 may be configured as a bearing with a magnetic fluid seal.

  As mentioned above, although embodiment of this invention has been described, it cannot be overemphasized that this invention can be variously deformed and implemented in the range which is not limited to embodiment mentioned above and does not deviate from the summary. For example, the configuration for holding the magnetic fluid, the configuration for holding the magnet, the shape of the holding member (electrode plate), and the like can be modified as appropriate.

1 Reel body 5 Spool shaft (drive shaft)
6 Spool 8 Handle 30, 30 ', 30 ", 30A Bearing 31 with magnetic fluid seal Inner ring 32 Bearing body 33 Cage 34 Magnetic fluid seal 35 Rolling element 36 Outer ring 37, 38 Electrode plate 39 Magnet 99 Hexagonal ring (holding means)
S Seal storage space

Claims (5)

A bearing body comprising an inner ring, a cage disposed outside the inner ring, a rolling element retained by the cage, and an outer ring disposed outside the cage;
A magnetic fluid seal that is integrally held in the bearing body, forms a magnetic circuit with the inner ring or the outer ring made of a magnetic material, and seals the inside of the bearing body;
With
The magnetic fluid seal is held between a magnet that forms a magnetic circuit with the inner ring or the outer ring, a pair of electrode plates that hold the magnet from both sides, and the inner ring or the outer ring and the electrode plate. Consisting of magnetic fluids,
A bearing with a magnetic fluid seal.   The bearing with a magnetic fluid seal according to claim 1, further comprising holding means for holding the magnetic fluid seal on the bearing body.   When the axial length of one of the inner ring or the outer ring is set shorter than the other axial length, the magnetic fluid seal has its electrode plate in a seal housing space formed in the bearing body. 3. The magnetic fluid according to claim 1, wherein the magnetic fluid is incorporated so as to face the other inner surface in a radial direction in a state in which the inner ring or the outer ring abuts one end surface in the axial direction. Sealed bearing.   The bearing with a magnetic fluid seal according to any one of claims 1 to 3, wherein the cage also serves as one of the electrode plates.   A fishing reel that winds a fishing line around a spool supported by a reel body by a rotation operation of a handle coupled to a winding drive mechanism built in the reel body, and is rotated by the operation of the handle. A fishing reel, wherein the drive shaft is rotatably supported by the magnetic fluid seal bearing according to any one of claims 1 to 4.

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