Line roller

A line roller includes a cylindrical guide member including a guide surface on an outer perimeter for guiding a fishing line, an axle bearing member rotatably supporting an inner perimeter surface of the guide member, and a support member supporting the axle bearing member. The axle bearing member includes an inner ring supported by the support member, an outer ring integrally rotatable with the guide member, a rolling body disposed between the inner ring and the outer ring, and a grease holding unit holding water-repellent grease between the inner ring and the outer ring.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority based on Japanese Patent Application No. 2015-253140, filed in the Japan Patent Office on Dec. 25, 2015, the contents of which are hereby incorporated herein by reference.

BACKGROUND

Field of the Invention

The present invention relates to a line roller of a spinning reel for fishing.

Background Information

A spinning reel for fishing comprises a spool, a rotor comprising a pair of rotor arms, and a fishing line guiding mechanism (the so-called “bail arm”) pivotably mounted to the distal end of the pair of rotor arms (for example, see Japanese Published Unexamined Application. No. 2006-101704). The fishing line guiding mechanism is a mechanism for guiding the fishing line to the spool. The fishing line guiding mechanism comprises a bail, a pair of bail support members that support two ends of the bail, and a line roller.

A line roller, in general, comprises a guide member and an axle bearing member, such as a bearing. The guide member is rotatably mounted to the axle bearing member. Since the line, roller is used in an environment that easily comes into contact with seawater and the like, seawater, etc., is likely to enter the inside of the axle bearing member. When seawater, etc., enters inside the axle be member, solidification of the salt and rust can occur, which reduces the function of the axle bearing member. Therefore, there are inventions in which water-repellent grease is included inside the axle bearing in order to prevent seawater, etc., from entering inside the rolling bearing of the fishing reel (for example, see Japanese Published Unexamined Application No. 2004-290153). Further, there are inventions in which a contact or non-contact sealing structure is disposed on the rolling bearing, in which is included the lubricating grease (for example, see Japanese Published Unexamined Application No. 2003-148497).

SUMMARY

In the axle bearing member disclosed in the Japanese Published Unexamined Application No. 2004-290153, a seal is disposed on both sides of the axle bearing member to prevent the water-repellent grease from flowing to the outside. However, since there is a gap between the end of the seal and the axle bearing member, it is possible for the water-repellent grease to flow out through the gap due to the centrifugal force that is applied to the line roller. Once the water-repellent grease flows out, seawater, etc., can easily penetrate into the interior of the axle bearing member.

A concavo-convex labyrinth can be formed by opposing planes of sealing plates in the axle bearing, as disclosed in Japanese Published Unexamined Application No. 2003-148497, to prevent the intrusion of foreign matter (to improve dust resistance). However, while it is possible to prevent the intrusion of foreign matter to a certain degree, since a lubricating grease is used in this kind of axle bearing, the waterproofing property is insufficient against seawater, etc. Accordingly, a line roller having an axle bearing member that does not easily let seawater, etc., penetrate to the inside of the axle bearing member is desired.

The present invention was made to solve the problem described above, and an object thereof is to provide a line roller comprising an axle bearing member with a structure in which seawater, etc., cannot easily penetrate inside.

(1) The line roller according to the present invention is a line roller for guiding a fishing line to a spool of a spinning reel for fishing, comprising a cylindrical guide member comprising a guide surface on an outer perimeter for guiding the fishing line, an axle bearing member rotatably supporting an inner perimeter surface of the guide member, and a support member supporting the axle bearing member. The axle bearing member comprises an inner ring supported by the support member, an outer ring integrally rotated with the guide member, a rolling body disposed between the inner ring and the outer ring, and a grease holding unit that holds water-repellent grease between the inner ring and the outer ring.

(2) Preferably, the grease holding unit comprises a first grease holding unit forming portion that protrudes radially outwardly from the inner ring, and a second grease holding unit forming portion that protrudes radially inwardly from the outer ring, and that has a side surface that opposes a side surface of the first grease holding unit forming portion, such that the water-repellent grease is held between a side surface of the first grease holding unit forming portion and a side surface of the second grease holding unit forming portion.

(3) Preferably, the grease holding unit is formed such that the side surface of the first grease holding unit forming portion and the side surface of the second grease holding unit forming portion are opposed and bent in a complementary manner.

(4) Preferably, the grease holding unit is confi formed gured such that the second grease holding unit forming portion comprises a recess, the first grease holding unit forming portion is inserted in the recess leaving a gap, and the water-repellent grease is held in the gap.

(5) Preferably, the line roller further comprises a holding member between the guide member and the outer ring that connects the guide member and the outer ring, and a portion of the holding member also serves as the second grease holding unit forming portion.

(6) Preferably, the line roller further comprises an external grease holding unit that configures a space leading from the axle bearing member to the guide member, and that holds the water-repellent grease in the space.

(7) Preferably, the external grease holding unit comprises a seal member made of an elastic member that is disposed between the guide member and the support member.

(8) Preferably, the seal member comprises a fixed portion that is fixed to one of the guide member and the support member, and a lip portion that extends from the fixed portion toward the other member and in which a thickness of a distal end portion is thinner than a thickness of a fixed portion.

(9) Preferably, the external grease holding unit comprises a first annular protruding member having an annular protrusion that projects in an axial direction or a radial direction of the rotation of the axle bearing member, and a second annular protruding member having an annular protrusion that projects adjacent in a direction that opposes the annular protrusion.

(10) Preferably, the external grease holding unit comprises an annular protruding member having an annular protrusion that projects in an axial direction or a radial direction of the rotation of the axle bearing member, and an annular recessed member having an annular recess that is recessed complementary to the annular protrusion.

(11) Preferably, the water-repellent grease is held in at least a portion of the space that leads to the guide member and one outer end surface of the axle bearing member in the rotary support shaft direction.

(12) Preferably, the water-repellent grease is also filled inside the axle bearing member.

(13) Preferably, water-repellent grease that is different from the water-repellent grease described above is filled inside the axle bearing member.

(14) Preferably, the line roller comprises an external grease holding unit that configures a space leading from the axle bearing member to the guide member and that holds water-repellent grease in the space, and a portion of the holding member configures a portion of the external grease holding unit.

According to the present invention, it is possible to provide a line roller comprising an axle bearing member with a structure in which seawater, etc., cannot, easily penetrate inside.

DETAILED DESCRIPTION OF THE EMBODIMENTS

First Embodiment

The spinning reel for fishing and the line roller used therefor according to the first embodiment of the present invention will be described with reference to the drawings. In the following description, “front” indicates the direction in which the fishing line is unreeled; specifically, the left inFIG. 1andFIG. 2is the “front.” In addition, the material of each member is not limited to the examples; well-known materials having the necessary function and durability may be appropriately used.

As shown inFIG. 1, the spinning reel for fishing100comprises a reel body110, a rotor120, a spool130, a handle140, and a fishing line guiding mechanism2. Further, as shown inFIG. 2, the spinning reel for fishing100further comprises a drive mechanism150, an oscillating mechanism160, a pinion gear170, and a spool shaft180.

As shown inFIG. 1, the reel body110comprises a case part111and a lid portion112. The lid portion112can be detached from the case part111. Further, the case part111comprises a, mounting portion113that extends in a longitudinal direction. The mounting portion113is a portion that is mounted to a fishing rod.

As shown inFIG. 2, the reel body110comprises an internal space that is defined by the case part111and the lid portion112, which houses various mechanisms. In particular, the drive mechanism150and the oscillating mechanism160are housed in the reel body110.

The drive mechanism150comprises a drive shaft151and a drive gear152. The drive shaft151is coupled with a handle shaft141and is integrally rotated with the handle shaft141.

The drive gear152is coupled with the drive shaft151, and is integrally rotated with the drive shaft151. The drive gear152is a face gear and meshes with the gear portion171of the pinion gear170. The drive shaft151and the drive gear152are rotated by rotating the handle140that is mounted to the side surface, of the reel body110, and the pinion gear170is also rotated.

The pinion gear170is disposed in the reel body110. In particular, the pinion gear170extends forwardly from inside the reel body110. The pinion gear170is rotatably disposed around the spool shaft180. The pinion gear170is formed in a tubular shape and the spool shaft180extends inside the pinion gear170. The pinion gear170is supported in the reel body110via a plurality of axle bearing members.

The spool shaft180extends forwardly from inside the reel body110. The spool shaft180is reciprocated in the longitudinal direction by rotating the handle140. In particular, the rotation of the handle140rotates the pinion gear170via the drive gear152. Accompanying the rotation of this pinion gear170, the oscillating mechanism160reciprocates the spool shaft180in the longitudinal direction.

The spool130is a member on which the fishing line is wound. The spool130is supported on the distal end portion of the spool shaft180. The spool130is integrally reciprocated with the spool shaft180in the longitudinal direction.

The rotor120is a member for winding the fishing line on the spool130. The rotor120is fixed to a front portion of the pinion gear170, and is integrally rotated with the pinion gear170. Therefore, the rotor120is non-rotatable relative to the pinion gear170.

The rotor120comprises a rotor body121, a first rotor arm122, and a second rotor arm123. The rotor body121has a cylindrical shape. The first rotor arm122and the second rotor arm123extend from the outer perimeter surface of the rotor body121toward the front. The first rotor arm122and the second rotor arm123are disposed in opposite positions in the circumferential direction of the rotor body121.

FIG. 3is a front view of a spinning reel. As shown inFIGS. 1-3, the fishing line guiding mechanism2is a mechanism to guide the fishing line to the spool130. The fishing line guiding mechanism2is attached to the distal end portions of the first rotor arm122and the second rotor arm123.

The fishing line guiding mechanism2is pivotably mounted to assume the line guiding position and the line releasing position. The fishing line guiding mechanism2comprises a first bail support member21and a second bail support member22, a bail23, a support shaft (support member)24, and a line roller3.

The first bail support member21is pivotably mounted to the first rotor arm122. Specifically, the first bail support member21is pivotably mounted to the outside of the distal end portion of the first rotor arm122.

The second bail support member22is pivotably mounted to the second rotor arm123. Specifically, the second bail support member22is pivotably mounted to the outside of the distal end portion of the second rotor arm123.

FIG. 4is a partial, enlarged view of the fishing line guiding mechanism2. As shown inFIG. 4, the first bail support member21comprises a first end portion21aand a second end portion21b. The first end portion21ais pivotably mounted to the first rotor arm122. The second end portion21bof the first bail support member21supports the first end portion23aof the bail23via the support shaft24(refer toFIG. 5).

As shown inFIG. 1andFIG. 2, the second bail support member22comprises a first end portion22aand a second end portion22b.

The first end portion22ais pivotally mounted to the second rotor arm123. The second end portion22bsupports the second end portion23bof the bail23.

As shown inFIG. 3, the bail23is a member curved in a substantially U-shape and made of stainless steel alloy. The bail23is curved to protrude outwards along the outer perimeter surface of the spool130. This bail23comprises a cover portion23aat the first end portion.

The cover portion23ais supported on the first bail support member21via the support shaft24. Further, the second end portion23bof the bail23is supported on the second bail support member22. When the fishing line guiding mechanism2returns to the line guiding position from the line releasing, position, the bail23guides the fishing lace to the line roller3via the cover portion23a. The line roller3is a member for guiding the fishing line to the spool130of the spinning reel for fishing100.

FIG. 5is a partial cross-sectional view of the fishing line guiding mechanism2comprising the line roller3. The line roller3is formed such that the guide member6is rotatably supported around the support shaft24along with the holding member5, by the axle bearing member4, with respect to the stationary support shaft24. The fishing line is guided to the spool130by the rotating guide member6. Meanwhile, in the following explanation, the axial direction means the direction in which the rotational axis O of the line roller3(axle bearing member4) extends. That is, the axial direction means the direction in which the supporting shaft24extends, and inFIG. 5, the left and right direction is the axial direction. Further, the radial direction means the radial direction of a circle centered on the rotational axis O. In addition, the circumferential direction means the circumferential direction of a circle centered on the rotational axis O.

As shown inFIG. 5, a through-hole21cis formed at the second end portion21bof the first bail support member21. The through-hole21cis a stepped through-hole. A support shaft24extends through this through-hole21c.

The support shaft24extends between the first bail support member21and the cover portion23aof the bail21. The support shaft24comprises a tubular portion241and a bolt portion242. The tubular portion241comprises a shaft portion241aand a head portion241b. The shaft portion241ais a cylindrical shape and a female threaded portion is formed on the inner perimeter surface. The head portion241bhas a larger diameter than the shaft portion241a. With the head portion241babutting the Cover portion23a, the movement of the tubular portion241in the axial direction is regulated.

The bolt portion242comprises a shaft portion242aand a head portion242b. The shaft portion242ahas a cylindrical shape and a male threaded portion is formed on the outer perimeter surface. Accordingly, the bolt portion242screws into the tubular portion241. The head portion242bhas a larger diameter than the shaft portion242a. With the head portion242babutting the second end portion21bof the first bail support member21, the movement of the bolt portion242in the axial direction is regulated.

As shown inFIG. 5, the line roller3comprises an axle bearing member4, a holding member (collar member)5, and a guide member6. In addition, the line roller3comprises a regulating member44A, a regulating member44B, and a regulating member7. Meanwhile, the line roller3is formed in an annular shape centered on the axis O, and is vertically symmetrical relative to the axis O on a cross-sectional view that is parallel to the axis O, as shown inFIG. 5; therefore, inFIG. 6and below, reference symbols are provided to the upper half of the axis O in the following description. In addition, there are cases in which the right direction or the left direction in the figure is referred to as axially outward. The same applies to the following cross-sectional view.

The axle bearing member4is abutted by the regulating member44A from the left side inFIG. 5, and abutted by the regulating member44B from the right side inFIG. 5. The regulating member44B is further abutted by the regulating member7from the right side. In this manner, the position of the axle bearing member4is regulated by the regulating member44A, the regulating member44B, and the regulating member7.

As shown inFIG. 6, the axle bearing member4comprises an inner ring41, an outer ring42, and a plurality of rolling bodies43; a lubricating oil (lubricating grease) is appropriately applied to the inner ring41, the outer ring42, and the plurality of rolling bodies43, which are configured to slide with each other, and to be rotatably supported. The inner ring41is a cylindrical shape. The support shaft24is fitted to the inner ring41to fix and support the inner ring41. Accordingly, the inner ring41does not rotate relative to the support shaft24.

The outer ring42is a cylindrical shape and has a larger diameter than the inner ring41. The outer ring42is disposed radially outwardly of the inner ring41. Each rolling body43is disposed between the inner ring41and the outer ring42. Rolling bodies43are disposed at intervals from each other in the circumferential direction. The inner ring41and the outer ring42are formed from metal, for example, stainless steel. The outer ring and the guide member6are connected via the holding member5.

The holding member (collar member)5comprises a first holding member51and a second holding member52which are arranged in the axial direction. The first holding member51and the second holding member52are separate members. The first holding member51comprises a first shoulder portion51aand the second holding member52comprises a second shoulder portion52a. The holding member5, that is, the first holding member51and second holding member52, are preferably made of synthetic resin. Although not particularly limited thereto, for example, the first holding member51and second holding member52are formed by POM (polyacetal) resin.

The holding member5abuts both ends of the outer perimeter of the outer ring42. Specifically, the first shoulder portion51.aand the second shoulder portion52aof the holding member5are formed in a plate shape in the radial direction, the inner perimeter of the first shoulder portion51aabuts the first end42aof the outer ring42, and the inner perimeter of the second shoulder portion52aabuts the second end42bof the outer ring42.

When the first holding member51and the second holding member52are mounted to the axle bearing member4, the inner perimeter surfaces of the first holding member51and the second holding member52engage the outer perimeter surface of the outer ring42of the axle bearing member4, and the first holding member51and the second holding member52are integrally rotated with the outer ring42. Since the guide member6is coupled with the holding member5, the guide member6is integrally rotated with the holding member5and the outer ring42.

In this manner, the guide member6is rotated around the axle bearing member4. Accordingly, there is a space that leads from the axle bearing member4to the guide member6(the outer perimeter part thereof, the outer space of the line roller3) in the periphery of the axle bearing member4. Seawater, etc., reaching the axle bearing member4through this space and entering inside the axle bearing member4causes a reduction in the function of the axle bearing member4. Accordingly, the axle bearing member4comprises a grease holding, unit that holds water-repellent grease10between the inner ring41and the outer ring42, so that seawater, etc., is less likely to enter inside the axle bearing member4.

As shown inFIG. 6, at one end of the inner ring41(the left side end inFIG. 6), a first grease holding unit forming portion46A protrudes radially outwardly from the outer perimeter surface of the inner ring41in an annular shape. The protruding height of the first grease holding unit forming portion46A is a height leaving a gap so as to not abut the inner perimeter surface of the outer ring42. Annular protrusion46aand protrusion46bthat protrude axially outwardly are respectively formed at a distal end portion and an intermediate portion of the first grease holding unit forming portion46A. The protrusion46aand protrusion46bhave annular shapes in which the radial widths are narrower than the first grease holding unit forming portion46A.

In addition, at one end of the outer ring42, a second grease holding unit forming portion47A protrudes radially inwardly from the inner perimeter surface of the outer ring42in an annular shape. The protruding height of the second grease holding unit forming portion47A is a height that leaves a gap so as to not abut the outer perimeter surface of the inner ring41. The second grease holding unit forming portion47A is disposed so as to be positioned further axially outwardly than the first grease holding unit forming portion46A. Annular protrusion47aand protrusion47bprotrude axially inward and are respectively formed at a distal end portion and an intermediate portion of the second grease holding unit forming portion47A. The protrusion47aand protrusion47bhave annular shapes in which the radial widths are narrower than the second grease holding unit forming portion47A. The first grease holding unit forming portion46A and the second grease holding unit forming portion47A are formed from metal or synthetic resin.

The positional relationship between the first grease holding unit forming portion46A and the second grease holding unit forming portion47A is a relationship in which the protrusion47bopposes a recess between the protrusion46aand the protrusion46b, and the protrusion47aopposes a recess between the protrusion46band the outer perimeter of the inner ring41. Conversely, the protrusion46bopposes a recess between the protrusion47aand the protrusion47b, and the protrusion46aopposes a recess between the protrusion47band the inner perimeter of the outer ring42. However, the distal ends of the protrusions are spaced apart and do not abut each other. As a result, as shown inFIG. 6, the side surfaces of the first grease holding unit forming portion46A and of the second grease holding unit forming portion47A are opposed so as to have mutually complementary shapes, and the gap therebetween forms a narrow bent space (a labyrinthine space). Water-repellent grease10is held in this gap.

On the other hand, at the other end of the inner ring41(the right side end inFIG. 6), a first grease holding unit forming portion46B protrudes radially outwardly from the outer perimeter surface of the inner ring41in an annular shape. Annular protrusions46cand46dprotrude axially outwardly and are, respectively, formed at a distal end portion and an intermediate portion of the first grease holding unit forming, portion46B. The protrusion46cand protrusion46dhave annular shapes in which the radial widths are narrower than the first grease holding unit forming portion46B.

In addition, at the other end of the outer ring42, a second grease holding unit forming portion47B protrudes radially inwardly from the inner perimeter surface of the outer ring42in an annular shape. The second grease holding unit forming portion47B is disposed so as to be positioned further axially outwardly than the first grease holding unit forming portion46B. Annular protrusions47cand47dprotrude axially inwardly and are respectively formed at a distal end portion and an intermediate portion of the second grease holding unit forming portion47B. The protrusion47cand protrusion47dhave annular shapes in which the radial widths are narrower than the second grease holding unit forming portion47B. The first grease holding unit forming portion46B and the second grease holding unit forming portion47B are formed from metal or synthetic resin.

The positional relationship between the first grease holding unit forming portion46B and the second grease holding unit forming portion47B is a relationship in which the protrusion47dopposes a recess between the protrusions46cand46d, and the protrusion47copposes a recess between the protrusion46dand the outer perimeter of the inner ring41. Conversely, the protrusion46dopposes the recess between the protrusions47cand47d, and the protrusion46copposes a recess between the protrusion476and the inner perimeter of the outer ring42. However, the distal ends of the protrusions are spaced apart and do not abut each other. As a result, as shown inFIG. 6, the side surfaces of the first grease holding unit forming portion46B and of the second grease holding unit forming portion47B are opposed so as to have mutually complementary shapes, and the gap therebetween forms a narrow bent space (labyrinthine space). Water-repellent grease10is held in this gap.

Since the water-repellent grease10is held in a narrow bent gap and prepared so as to have a high consistency, the grease will not easily flow out, even if a strong force is applied to the line roller3, such as centrifugal force. Water-repellent grease10does not absorb, but repels water when coming in contact with seawater or river water. Therefore, seawater, etc., that tries to enter inside the axle bearing member4is repelled to prevent an intrusion. The water-repellent grease10is also applied to the outside surface of the axle bearing member4to provide water repellency to the outside surface of the axle bearing member4.

A well-known water-repellent grease10may be used. For example, fluorine grease, silicone grease, and silicon grease may be used. Fluorine grease is obtained by, for example, adding a thickener, such as polytetrafluoroethylene (PTFE), to a fluorine oil having perfluoropolyether as the main component. Silicone grease is obtained by, for example, adding a thickener, such as metal soap, to a silicone oil having polysiloxane as the main component. Silicon grease is obtained by adding a thickener, such as silica fume, to silicone oil.

As shown inFIG. 6, the guide member6is a cylindrical shape. In particular, the guide member6is a cylindrical member centered on the axis O, with a concavo/convex structure formed so as to stably guide the fishing line thereto, as well as to engage the holding member5. While not particularly limited thereto, the guide member6is, for example, made of metal. For example, the guide member6is formed of stainless steel.

The guide member6is disposed on the outer perimeter side of the holding member5, and covers the outer perimeter surface of the holding member5. That is, the holding member5is inserted into the guide member6. The guide member6is engaged with the holding member5in a state in which the holding member5is inserted into the guide member6. That is, the guide member6is engaged with the holding member5so as to not move in the axial direction relative to the holding member5.

The guide member6comprises a guide surface61on the outer perimeter which guides the fishing line. Specifically, an annular groove62that extends in the circumferential direction is formed on the guide surface61. In particular, this groove62is formed in a position that is further toward the first holding member51side than the center of the guide surface61in the axial direction. The guide surface61is inclined on both ends toward the groove62so as to guide the fishing line to the groove62

In the line roller3having the configuration described above, a grease holding unit comprising the first grease holding unit forming portion46A and the second grease holding unit forming portion47A, and a grease holding unit comprising the first grease holding unit forming portion46B and the second grease holding unit forming portion47B are provided on both ends of the interior of the axle bearing member4. Water-repellent grease10is held in these grease holding units. The gaps in the grease holding units are narrow and bent, having a high ability to hold water-repellent grease10; therefore, water-repellent grease10does not easily flow out. Accordingly, even if seawater, etc., penetrates from outside of the line roller3to the periphery of the axle bearing member4, it is possible to prevent intrusion into the interior of the axle bearing member4for a long period of time, and to suppress problems in the axle bearing member4caused by seawater, etc.

Further, the first grease holding unit forming portion46A and the second grease holding unit forming portion47A do not contact directly. In addition, the first grease holding unit forming portion46B and the second grease holding unit forming portion47B do not contact directly. Therefore, the rotation of the axle bearing member4is not affected by friction, or the like. Additionally, the problem that the temperature is increased by frictional heat due to contact, and that it becomes easy for the water-repellent grease10to flow out due to increased fluidity, does not occur.

Modified Example 1

The first embodiment was described above; however, the grease holding unit formed inside of the axle bearing member4is not limited to the shape described above. For example, as shown inFIG. 7A, the first grease holding unit forming portions46A,46B may be disposed further axially outwardly than the second grease holding unit forming portions47A,47B. In this case, the protrusions46a,46bof the first grease holding unit forming portion46A protrude axially inwardly, the protrusions47a,47bof the second grease holding unit forming portion47A protrude axially outwardly, and the first grease holding unit forming portion46A and the second grease holding unit forming portion47A are opposed to each other. Further, the protrusions46c,464of the first grease holding unit forming portion46B protrude axially inwardly, the protrusions47c,47dof the second grease holding unit forming portion47B protrude axially outwardly, and the first grease holding unit forming portion46B and the second grease holding unit forming portion47B are opposed to each other. Water-repellent grease10is held in each of the grease holding units formed in this manner. The same effect as in the first embodiment can also be obtained by such a configuration.

Modified Example 2

In addition, as shown inFIG. 7B, an annular first grease holding unit forming portion48A may protrude radially outwardly from the outer perimeter surface of the inner ring41, and two second annular grease holding unit forming portions49A,49C may protrude radially inwardly from the inner perimeter surface of the outer ring42to form the grease holding unit. The protruding heights of the first grease holding unit forming portion48A and the second grease holding unit forming portions49A,49C are heights leaving a gap so as to not abut the outer ring42or the inner ring41on the opposing side. The first grease holding unit forming portion48A, is opposed to a recess formed by the two second grease holding, unit forming portions49A,49C with a gap therebetween. Water-repellent grease10is held in a gap that is bent in a deep U-shape formed in this manner. With this configuration, it is possible to prevent the water-repellent grease10from flowing out, especially when centrifugal force acts in a radially outward direction, with a simpler structure than in the first embodiment. The two grease holding unit forming portions49A,49C may be formed from one U-shaped member as well.

Modified Example 3

Further, portions of the first holding member51and the second holding member52may be formed as (a portion of) the second grease holding unit forming portion47A. As shown inFIG. 8A, an annular first grease holding unit forming portion46A protrudes radially outwardly from the outer perimeter surface of the inner ring41on the left end side of the axle bearing member4, and an annular second grease holding unit forming portion47A protrudes from the inner perimeter surface of the outer ring42. This is the same structure as shown inFIG. 7A. In this third modified example, a first shoulder portion51aof the first holding member51protrudes radially inward to form a gap with the first grease holding unit forming portion46A. Water-repellent grease10is also held in this gap as well. The right end side of the axle bearing member4is formed in the same manner. With this structure, it is possible to further increase the retention force of the water-repellent grease10compared to the first modified example shown inFIG. 7A. Meanwhile, the second grease holding unit forming portions49A,49B of the second modified example shown inFIG. 7Bmay be omitted, and the riles thereof be assigned to the first shoulder portion51aand the second shoulder portion52a.

Modified Example 4

In the fourth modified example shown inFIG. 8B, the roles of the second grease holding, unit forming portions47A,47B in the first embodiment are assigned to the first holding member51and the second holding member52. Specifically, second grease holding unit forming portions47A,47B are not formed on the outer ring42. Instead, the first shoulder portion51aof the first holding member51extends radially inwardly, and two annular protrusions53a,53bare formed axially inwardly from the first shoulder portion51a. The protrusion53aopposes a recess formed between the protrusion46bof the first grease holding unit forming portion46A and the outer perimeter surface of the inner ring41, and the protrusion5T opposes a recess formed between the protrusions46aand46bof the first grease holding unit forming portion46A. Similarly, two annular protrusions54a,54bare formed axially inwardly from the second shoulder portion52athat extends radially inwardly. With this structure, it is not necessary to form second grease holding unit forming portions47A,47B on the outer ring42.

In the third and fourth modified example described above, (all or a portion of) the role of the second grease holding unit forming portion is assigned to the first holding member51and the second holding member52. However, the invention is not limited thereto; the role of the first grease holding unit forming portion or of the second grease holding unit forming portion may be assigned to a member abutting the axle bearing member4(such as regulating members44A,44B) as well. While not shown, for example, portions of the regulating members44A,44B may extend radially outwardly, protrusions may be provided if necessary, and combined with the opposing first (or second) grease holding unit forming portion.

Further, in the first embodiment and modified examples 1 to 4 described above, the water-repellent grease10may be filled inside of the axle bearing member4(between the left and right grease holding units) as well. With this configuration, it is possible to prevent the water-repellent grease10of the grease holding unit from flowing out and into the axle bearing member4, and to further increase the retention force of the water-repellent grease10. In addition, lubricating grease may be filled between the left and right grease holding units instead of the water-repellent grease. With this configuration, it is possible to further increase the retention force of the water-repellent grease10, and to further improve the lubricity of the axle bearing member4(both not shown).

Second Embodiment

A line roller3having a grease holding unit inside of the axle bearing member4(first embodiment) was described above. However, the line roller3of the present invention is not limited to the embodiment described above. Next, the line roller3A according to the second embodiment of the present invention will be described usingFIG. 9. Members that are common with the first embodiment are given the same reference symbols, and portions that are different from the line roller3of the first embodiment will be given focus in the description.

As shown inFIG. 9, the line roller3A comprises an axle bearing member4, a holding member (collar member)5, and a guide member6. Further, the line roller3A comprises a regulating member7, a first external grease holding unit forming member8, and a second external grease holding unit forming member9.

As shown inFIG. 10, the first holding member51comprises a first seal portion51b. The first seal portion51bis an annular protrusion (annular protrusion) that extends axially leftward of the outer ring42from the lower end of the first shoulder portion51a. Similarly, the second holding member52comprises a second seal portion52b. The second seal portion52bis an annular protrusion (annular protrusion) that extends axially rightward of the outer ring42from the lower end of the second shoulder portion52a. That is, the first seal portion51band the second seal portion52bextend symmetrically in opposite directions on both sides of the axle bearing member4.

As described above, there is a space that leads from the axle bearing member4to the guide member6(the outer perimeter part thereof, the outer space of the line roller3A) in the periphery of the axle bearing member4. Seawater, etc., reaching the axle bearing member4through this space causes a reduction in the function of the axle bearing member4. Accordingly, so that seawater, etc. does not reach the axle bearing, member4, this space is made into a narrow passageway (labyrinth), and external grease holding units that hold water-repellent grease10are formed in two locations in the passage space on both sides of the axle bearing member4. The external grease holding units in the two locations are respectively configured from a first external grease holding unit forming member8and the first seal portion51bof the first holding member51, and a second external grease holding unit forming, member9and the second seal portion521of the second holding member52.

The first external grease holding unit forming member8is formed from a tubular portion (annular protrusion)8bthat is formed in the circumferential direction, a tubular portion (annular protrusion)8cthat is formed in the circumferential direction at an interval from the tubular portion8bin the radial direction, and a flat plate portion8dthat connects the tubular portion8band the tubular portion8cin the radial direction. The tubular portion8cextends from the flat plate portion8din the direction of the guide member6, but is formed so as to not abut the guide member6. The first external grease holding unit forming member8is preferably made of synthetic resin. The first external grease holding unit forming member8forms the external grease holding unit along with the first seal portion51b.

Specifically, the first external grease holding unit forming member8comprises an annular depression (annular recess)8abetween the tubular portion8band the tubular portion8c. The depression8ahas a shape that is complementary to the first seal portion51bof the first holding member51. The first seal portion51bis opposed to the depression8a, but does not abut the flat plate portion8d. That is, the first seal portion511is opposed to the annular recess8awith a dimension configuration that forms a labyrinthine space (gap) having a U-shaped cross section. Water-repellent grease10is held in the space8a.

Since the water-repellent grease10is held in the narrow space8aand has a high consistency, the grease will not flow out of the end portion of the annular recess8aon the guide member6side.

In addition, the water-repellent grease10is also applied to the outside surface of the axle bearing member4. Since the water-repellent grease10does not absorb, but repels seawater, etc, with which it comes into contact, the grease provides water repellency to the outside surface of the axle bearing member4. Further, since the water-repellent grease10is held in the passage space from the outside of the line roller3A to the axle bearing member4, it is possible to effectively prevent seawater, etc., that tries to enter from the outside of the line roller3A, from reaching the outer surface of the axle bearing member4.

The end portion of the tubular portion8bon the axle bearing member4side abuts the first end41aof the inner ring41of the axle bearing member4. That is, the first external grease holding unit forming member8also plays the role of a regulating member that regulates the position of the axle bearing member4from the left inFIG. 10.

The second external grease holding unit forming member9made of synthetic resin is disposed on the opposite side of the first external grease holding unit forming member8across the axle bearing member4. The second external grease holding unit forming member9is symmetrical with the first external grease holding unit forming member8relative to a plane that is perpendicular to the axis O.

The end of the tubular portion9bof the second external grease holding unit forming member9abuts the second end41bof the inner ring41of the axle bearing member4. Further, a regulating member7is disposed to abut the opposite side of the side of the second external grease holding unit forming member9that abuts the axle bearing member4.

In the same way as the first external grease holding unit forming member8, the second external grease holding unit forming member9forms an annular depression (annular recess)9afrom the tubular portion (annular protrusion)9band the tubular portion (annular protrusion)9c. The depression9ahas a shape that is complementary to the second seal portion52bof the second holding member52. The second seal portion52bopposes the annular recess9aso as to form a labyrinthine space (gap) having a U-shaped cross section. Water-repellent grease10is held in this space9aAs described above, the second external grease holding unit forming member9forms the external grease holding, unit that holds water-repellent grease10along with the second seal portion52b.

Since the water-repellent grease10is held in the narrow space9aand is prepared to have a high consistency, the grease will not flow out of the end portion of the annular recess9aon the guide member6side.

In addition, the water-repellent grease10is also applied to the outside surface of the axle bearing member4to provide water repellency to the outside surface of the axle bearing member4.

Water-repellent grease10does not absorb, but repels water when corning in contact with seawater or river water. Accordingly, even if seawater, etc., enters into the narrow passage spaces8a,9a, the seawater, etc., is blocked by the water-repellent grease10and cannot penetrate further.

In the line roller3A having the structure described above, an external grease holding unit configured from the first external grease holding unit forming member8and the first seal portion51bis formed in the periphery of the axle bearing member4, and water-repellent grease10is held therein. In addition, an external grease holding, unit formed from the second external grease holding unit forming member9and the second seal portion52bis formed, and water-repellent grease10is held therein. Since these external grease holding, units form narrow spaces that are formed in a U-shape, the effect of holding the water-repellent grease10is high. Accordingly, it is possible to more effectively prevent seawater, etc., from penetrating to the inside of the axle bearing member4from outside of the line roller3A and to suppress problems in the axle bearing member4.

Third Embodiment

Line rollers3and3A were described above in which a grease holding unit is disposed on the inside, or on each of the inside and the outside, of one axle bearing member4, as the first and second embodiments. However, the axle bearing is not limited to one, and may comprise two or more axle bearings. A line roller3B according to the third embodiment of the present invention comprising two axle bearing members will be described below usingFIG. 11. Members that are common with the first embodiment are given the same reference symbols, and portions that are different from the line roller3of the first embodiment will be given focus in the description.

As shown inFIG. 11A, the line roller3B comprises two ball bearings (axle bearing member)4A,4B on the outer perimeter of the support shaft24, a regulating member45, a first external grease holding unit forming member8, a second external grease holding unit forming member9, a first holding member (collar member)51, a second holding member (collar member)52, and a guide member6. The axle bearing members4A,4B both have the same structure as the axle bearing member4of the first embodiment. Water-repellent grease is not shown inFIG. 11A.

As shown inFIG. 11B, a first end41Aa of the inner ring41A of the axle bearing member4A abuts the tubular portion8bof the first external grease holding unit forming member8. A second end41Ab of the inner ring41A abuts the first end45aof the regulating member45. A first end41Ba of the inner ring41B of the axle bearing member4B abuts the tubular portion9bof the second external grease holding unit forming member9. In addition, a second end41Bb of the inner ring41B abuts the second end45bof the regulating member45. That is, the positions of axle bearing members4A,4B are regulated by the first external grease holding unit forming member8and the second external grease holding unit forming member9on both sides, and the regulating member45in the middle.

The outer perimeter of the outer ring42A engages the inner perimeter of the first holding member51. An axially inner end51cof the first holding member51extends radially inwardly, and abuts the second end42Ab of the outer ring42A. The end of the first holding member51on the opposite side of the end51cextends from the axially outer end surface of the outer ring42A in the radial direction, and is further bent outwardly in the axial direction to form an annular protrusion51b.

The outer perimeter of the outer ring42B is engaged with the inner perimeter of the second holding member52. An axially inner end52cof the second holding member52extends radially inwardly, and abuts the second end42Bb of the outer ring42B. The end of the second holding member52on the opposite side of the end52cextends from the axially outer end surface of the outer ring42B in the radial direction, and is further bent outwardly in the axial direction to form an annular protrusion52b.

The inner perimeter of the guide member6is engaged with the outer perimeters of the first holding member51and the second holding member52. Accordingly, the guide member6is rotated along with the outer rings42A,42B of the axle bearing members4A,4B via the first holding member51and the second holding member52.

The first external grease holding unit forming member8is formed from a tubular portion (annular protrusion)8bthat contacts the support shaft24, and a flat plate portion8dthat extends from the tubular portion8bin the radial direction. The axial width of the flat plate portion8dis smaller than the tubular portion8b. Therefore, a space (external grease holding portion)8fis formed between the flat plate portion8dand the first holding member51as well as the axle bearing member4A.

The axially outward end of the first external grease holding, unit forming, member8abuts a recess23cthat is provided on the inner side of the first end23aof the bail23. A space (annular recess8a) is formed between the outer perimeter8gof the flat plate portion8dand a wall portion23dof the recess23c. The annular protrusion51bof the first holding member51is opposed to this annular recess8aso as to form a space (space formed by the annular recess8aand the annular protrusion51b)8a.

Water-repellent grease10is held in the space8fand the space8a. The water-repellent grease10that is held in the space8fis held so as to contact the outer side surface42Ac of the outer ring42A, to prevent seawater, etc., from reaching the surface of the axle bearing member4A. While there is a portion in which water-repellent grease10is not filled in a part of the left side of the axle bearing member4A inFIG. 11B, the water-repellent grease10may be filled in the entire left side.

The second external grease holding unit forming member9includes a tubular portion (annular protrusion)9bthat contacts the support shaft24, and a tubular portion (annular protrusion)9cthat is formed at an interval in the radial direction from the tubular portion9b. The space between the tubular portion9band the tubular portion9cis connected by a flat plate portion9e. A depression (annular recess)9ais formed on the tubular portion9cside of the flat plate portion9e. The annular protrusion52bof the second holding member52is opposed to the annular recess9aso as to form a space (space formed by the annular recess9aand the annular protrusion52b)9a. In addition, a space9f(external grease holding portion) is formed between the axle bearing member4B and the axial surface of the flat plate portion9eexcluding the annular recess9a.

Water-repellent grease10is held in the space9fand the space9a. The water-repellent grease10that is held in the space9fis held so as to contact the outer side surface42Bc of the outer ring42B, to prevent seawater, etc., from reaching the surface of the axle bearing member4B. While there is a portion in which water-repellent grease10is not filled in a part of the right side of the axle bearing member4B inFIG. 11B, the water-repellent grease10may be filled in the entire right side.

The tubular portion9cis disposed on the outermost perimeter side of the second external grease holding unit forming member9, and a grease receiving part9gis formed on the inner perimeter thereof. The water-repellent grease10is prepared to have sufficient consistency so as to not flow out under normal use conditions. However, since a strong centrifugal force acts on the line roller3B in the upward direction inFIG. 11B, it is possible that a portion thereof flows out. The grease receiving part9gis a space for receiving the grease in the unlikely event that the water-repellent grease10flows out. Such a grease receiving part9gmay be provided on the first external grease holding unit forming member8side as well.

The line roller3B having the structure described above comprises an external grease holding unit in which a narrow, bent space (labyrinth) is brined outside of the axle bearing members4A,4B, thereby has a high effect of holding the water-repellent grease10. Accordingly, it is possible to further prevent seawater, etc., from penetrating to the inside of the axle bearing members4A,4B from outside of the line roller3B, and to suppress problems in the axle bearing members4A,4B caused by seawater, etc.

Meanwhile, grease holding units were provided to both the inside and the outside of the two axle bearing, members4A,4B in the third embodiment, but the embodiment may be configured to provide grease holding units only to the inside of the two axle bearing members4A,4B.

Embodiments that have an external grease holding unit in addition to the grease holding unit inside of the axle bearing member4were described above as the second and third embodiments. However, the form of the external grease holding unit is not limited thereto, various modifications such those below are possible.

Modified Example 5

In the second embodiment, the first external grease holding unit forming member8and the second external grease holding unit forming member9were configured as single annular recessed members. However, the configuration of the first external grease holding unit forming member8and the second external grease holding, unit forming, member9is not limited thereto, and may be configured by a plurality of members.

As shown inFIG. 12, in a line roller3C according to the fifth modified example, the annular recess8aof the first external grease holding unit forming member8is formed by abutting a tubular member8B formed in the periphery of the support shaft24to a member8A comprising a tubular portion8cand a flat plate portion8dthat extends in the radial direction.

The spacing between the tubular portion8cand the tubular member8B, and the axial length of the tubular member8B, are configured to have dimensions in which, when the first seal portion51bis opposed to the annular recess8a, a space (space formed b′) the annular recess8aand the first seal portion51b)8ais formed between the two. Water-repellent grease10is held in this space8a. Meanwhile, the tubular member8B also serves as a regulating member that regulates the position of the axle bearing member4. Further, the second external grease holding unit forming member9uses the same configuration. That is, a member9A and a tubular member9B are combined to form a space (annular recess9a), which is opposed to the second seal portion52b, and water-repellent grease10is held in the space (space formed by the annular recess9aand the second seal portion52b)9athereof. The same effect as the second embodiment can also be obtained by such a configuration.

In the fifth modified example, the manufacture of the first external grease holding unit forming member8and the second external grease holding unit forming member9becomes easier compared to the second embodiment, and it is possible to form an external grease holding unit at a low cost. For example, the member8A may be manufactured as a pressing member and the tubular member8B may be manufactured as a cutting member, which can be manufactured at a lower cost than a first external grease holding unit forming member8that is formed by integral molding or milling.

Modified Example 6

In the line roller3D according to the sixth modified example, portions of the first end23aof the bail23and the second end21bof the first bail support member21may by combined as the structure of the first external grease holding unit forming member8and the second external grease holding unit forming member9. Specifically, as shown inFIG. 13, a recess23cis formed on the inner side of the first end23aof the bail23. A tubular member8B is disposed so as to contact the end of the recess23c. An annular recess8ais formed between the recess23cand the outside surface of the tubular member8B. The first end23aand the tubular member8B are configured so that when this annular recess8aand the first seal portion51bof the first holding member51are opposed, a space (gap) is generated between the two. Water-repellent grease10is held in this space.

Further, a projection21eis formed on the inner side of the second end21bof the first bail support member21, and a recess21dis formed further on the inner side thereof. A regulating member7is disposed abutting the side surface of the recess21d, and a tubular member9B that is formed contacting, the support shaft.24is disposed sandwiched between the regulating member7and the inner ring41of the axle bearing member4. The region surrounded by the projection, the regulating member7; and the tubular member9B becomes the annular recess9a. Water-repellent grease10is held in the space (gap) that is formed by opposing the annular recess9aand the second seal portion52b. The same effect as the second embodiment can also be obtained by such a configuration.

In the sixth modified example, the member8A and the member9A can be omitted compared to the fifth modified example by changing a part of the structures of the first end23aof the bail23and the second end21bof the first bail support member21, and it is possible to further reduce the manufacturing cost.

Modified Example 7

In the second embodiment, a grease holding unit was configured by forming an annular recess. However, the structure of the external grease holding unit is not limited thereto. For example, one or more annular protrusions (members) may be disposed adjacent to each other with spaces (gap) therebetween in a mutually opposing direction in the axial direction, and the water-repellent grease10may be held in this space (not shown).

In the second embodiment, a space (gap) that is bent in a U-shape was formed and the water-repellent grease10was held therein; however, it is not necessary for the space to be bent in a U-shape. As described above, the configuration may be such that water-repellent grease10is held in a linear space (gap) of the two annular protrusions. In addition, a protruding member and a recessed member, or the like, may be combined so that the space is bent in a crank shape (not shown). In this case as well, a bail member and a bail support member may be used.

Further, in the second and third embodiments, the external grease holding unit is configured by forming an annular protrusion that extends in the rotational shaft direction of the axle bearing member4and an annular recess that is depressed in the axial direction. However, the invention is not limited thereto; an annular protrusion and an annular recess may be formed in a direction that is perpendicular to the axial direction (radial direction) and combined (not shown).

Modified Example 8

In the second and the third embodiments, the external grease holding unit is formed by forming an annular recess and an annular protrusion. However, the external grease holding unit is not limited thereto.

In the line roller3E according to the eighth modified example shown inFIG. 14, water-repellent grease10is held by forming lip seals80,90made of elastic members on both sides of the axle bearing member4. The lip seals60,90may be formed from synthetic rubber or natural rubber; specifically, from nitrile-butadiene rubber, which is a copolymer of butadiene and acrylonitrile.

The line roller3E is not provided with a holding member5between the guide member6and the axle bearing member4. The lip seal80comprises a fixed portion81that is fixed to a stepped portion6athat is formed at one end of the guide member6, and a lip portion82in which the thickness becomes thinner from the fixed portion81toward the distal end portion. The lip seal90comprises a fixed portion91that is fixed to a stepped portion6bthat is formed at the other end of the guide member6, and a lip portion92in which the thickness becomes thinner from the fixed portion91toward the distal end portion.

The tips of the lip portions82,92are respectively in contact with regulating members7A.7B that regulate the position of the axle bearing member4. Water-repellent grease10is held between the lip seal80and the axle bearing member4, as well as between the lip seal90and the axle bearing member4. It is possible to prevent seawater, etc., from reaching the axle bearing member4with this structure.

Meanwhile, the lip portions82,92may be configured to directly contact the support member24without providing regulating members7A,7B. Further, the lip seals80,90may be formed such that the fixed portions81,91are fixed to the regulating members7A,7B (or the support member24), and that the lip portions82,92are oriented in the direction of the guide member6. Further, a holding member5may be provided, and the lip seals80,90may be fixed to the holding member5(both not shown).

Modified Example 9

In the second and third embodiments described above, a grease holding space may be disposed in the external grease holding unit to further improve the holding performance of grease. The ninth modified example in which an external grease holding unit is provided in the line roller3B according to the third embodiment will be described with reference toFIG. 15.

As shown inFIG. 15, in the first external grease holding unit forming member8, a space (external grease holding portion)8e, which is a depression, is provided in a position in the flat plate portion8dthat faces the outer side surface of the outer ring42A of the axle bearing member4A. Water-repellent grease10is held in the external grease holding portion8e, the space8f, and the space8a. By providing the external grease holding portion8e, the retention force of grease with respect to the centrifugal force that acts in the upward direction of the figure is further improved.

In addition, on the second external grease holding unit forming member9side as well, a space (external grease holding portion)9b, which is a depression, is provided in a position of the Step9dthat faces the outer side surface of the outer ring42B of the axle bearing member4B. Water-repellent grease10is held in the external grease holding portion9b, the space (external grease holding portion)9j, and the space9a. By providing the external grease holding portion9h, the retention force of grease with respect to the centrifugal force that acts in the upward direction of the figure is further improved.

Modified Example 10

The axle bearing members4,4A,4B shown in the first to the third embodiments and the first to the tenth modified examples may be configured such that the water-repellent grease is filled throughout the interiors of the axle bearing members4,4A, and4B (not shown). In this configuration, it is possible to further suppress the water-repellent grease from flowing out, and to further increase the water repellency of the axle bearing members4A,4B.

In addition, lubricating grease may be filled inside the axle bearing members4,4A, and4B instead of water-repellent grease (not shown). While water-repellent grease10is held in the grease holding portions of the axle bearing members4,4A, and4B, the water-repellent grease10is grease with an emphasis on water repellency for preventing seawater, etc., from entering. Accordingly, by filling grease dedicated to lubrication inside the axle bearing members4,4A, and4B, the lubricity of the line roller can be improved as well.

Additionally, water-repellent grease10may be held by applying to the side surface or the outer perimeter surface of the axle bearing members4,4A, and4B as well. In addition, the water-repellent grease10may be filled in a portion or across the entirety, from the side surface or the outer perimeter surface of the axle bearing members4,4A, and4B to the inside of the external grease holding unit.

The above-described axle bearing members4,4A, and4B were configured as ball bearings. However, the invention is not limited thereto, as long as the axle bearing member4is a robing bearing. For example, the rolling body43may be a cylindrical (roller) shape.

The structures of the grease holding units inside and the outside of the axle bearing members4,4A, and4B shown in the above-described first to the third embodiments and the first to the tenth modified examples may be freely combined.