HK1171413B - Guide roller - Google Patents

Description

Guide wheel

Technical Field

The present invention relates to a guide wheel for holding a bearing in a housing, and more particularly to a guide wheel (guide roller) suitable for applying tension to a wire of a wire saw.

Background

Conventionally, there is known a wire saw for cutting a workpiece (for example, a silicon ingot, glass, or the like) made of a hard and brittle material (see patent document 1). In such a wire saw, the cutting, grooving, or the like of the workpiece can be performed by feeding the machining liquid containing the abrasive grains to the cutting portion of the workpiece, while moving the wire wound around the pulley unit at a predetermined speed in a state where an appropriate tension is applied, or by feeding the machining liquid not containing the abrasive grains while moving the wire to which the abrasive grains are adhered in advance at a predetermined speed.

Prior art documents

Patent document

Patent document 1: japanese patent laid-open No. 2008 and 68332

Disclosure of Invention

Problems to be solved by the invention

However, in the above-described conventional wire saw, since the abrasive grain mixed liquid (the machining liquid containing the abrasive grains or the liquid obtained by mixing the abrasive grains detached from the wire to which the abrasive grains are attached and the machining liquid) enters the housing for holding the bearing of the guide wheel, there is a problem that the life of the bearing is reduced and the running cost is increased.

The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a guide wheel capable of preventing an abrasive grain mixture solution from entering a housing holding a bearing from an axial hole, and improving the life of the bearing.

Means for solving the problems

The invention according to claim 1, which has been made to solve the above problems, is configured as follows: the guide wheel is provided with: bearings (2, 3); and a housing (4) that holds the bearing inside and has a shaft hole (50) into which a support shaft (6) attached to the bearing is inserted, the shaft hole having a tapered hole wall and being continuously reduced in diameter toward the inside of the housing.

Further, according to the 2 nd aspect of the present invention, the following structure can be formed: the support shaft has annular protrusions (65, 66), and the annular protrusions (65, 66) extend in the circumferential direction of the outer peripheral surface of the support shaft and protrude from the outer peripheral surface toward the tapered hole wall.

Further, as the 3 rd aspect of the present invention, the following structure can be formed: the guide wheel further comprises a cover member (71), wherein the cover member (71) is attached to the support shaft, and the cover member (71) is disposed so as to overlap the shaft hole in a plan view.

Further, as the 4 th aspect of the present invention, the following structure can be formed: the housing has annular step portions (17, 18) on the outer periphery thereof, and the annular step portions (17, 18) have tapered peripheral surfaces (17b, 18b) and are continuously expanded in diameter toward the outside in the axial direction.

Further, as the 5 th aspect of the present invention, the following structure can be formed: an annular protrusion (91) is provided in the housing, the annular protrusion (91) surrounds the opening of the shaft hole from the outside, and the annular protrusion (91) protrudes in a direction opposite to the insertion direction of the support shaft.

Further, as the 6 th aspect of the present invention, the following structure can be formed: the annular protrusion has a tapered inner circumferential surface (91b) that is continuously expanded in diameter toward the outside in the axial direction.

Effects of the invention

According to the above aspect 1 of the present invention, since the abrasive grain mixture liquid having intruded into the housing from the shaft hole is guided to the outside of the housing along the tapered hole wall by the centrifugal force generated when the housing is rotated, the following excellent effects are produced: the abrasive grain mixed liquid can be prevented from entering the housing from the shaft hole, and the service life of the bearing is prolonged.

Further, according to the above aspect 2 of the present invention, the mixed abrasive grain liquid that has intruded into the housing along the outer peripheral surface of the support shaft is guided to the tapered hole wall side of the housing by the annular projecting portion and then guided to the outside of the housing along the hole wall, and therefore intrusion of the mixed abrasive grain liquid into the housing can be more effectively prevented.

Further, according to the above aspect 3 of the present invention, since the shaft hole is covered with the cover member, the mixed abrasive particle solution can be prevented from entering the shaft hole, and the mixed abrasive particle solution can be more effectively prevented from entering the housing.

Further, according to the above-described aspects 4 and 5 of the present invention, the mixed abrasive grain liquid can be prevented from entering the shaft hole from the outer peripheral surface side of the housing along the side surface of the housing, and the mixed abrasive grain liquid can be more effectively prevented from entering the housing.

Further, according to the above-described aspect 6 of the present invention, since the abrasive grain mixture liquid that is intended to enter the inside of the annular projecting portion is guided to the outside of the housing along the tapered inner peripheral surface, the abrasive grain mixture liquid can be more effectively prevented from entering the axial hole side.

Drawings

Fig. 1 is a longitudinal sectional view of an important part of the guide wheel according to embodiment 1.

Fig. 2 is a side view of an important part of the guide pulley according to embodiment 1.

Fig. 3 is a front view of a pulley main body attached to the guide pulley of embodiment 1.

Fig. 4 is a side view of an end cover of the guide pulley of embodiment 1.

Fig. 5 is a longitudinal sectional view of an important part of the guide wheel according to embodiment 2.

Fig. 6 is a longitudinal sectional view of an important part of the guide wheel according to embodiment 3.

Detailed Description

< embodiment 1 >

The structure of the guide wheel according to embodiment 1 of the present invention will be described below with reference to fig. 1 to 4. In the description, the directions of the guide wheels and the constituent elements thereof are determined as "left" and "right" according to the arrangement shown in fig. 1, and the left-right direction is assumed as "axial direction".

The guide pulley 1 is a member for applying tension to a wire for cutting a workpiece in a wire saw not shown, and as shown in fig. 1, the guide pulley 1 mainly includes: a housing 4 in which two bearings 2 and 3 are held; a pulley body 5 (see fig. 3) attached to an outer periphery of the casing 4; and a support shaft 6 that rotatably supports the housing 4. The unillustrated steel wire is wound around two steel wire grooves 7 formed in the circumferential direction on the outer circumferential surface of the pulley body 5.

The housing 4 has: a substantially cylindrical housing main body 11; and an end cap 13, the end cap 13 being coupled to one end side of the case body 11 by a bolt 12. The mounting of the pulley body 5 with respect to the housing 4 is performed by: after the cylindrical portion 14 of the housing body 11 is inserted into the mounting hole 5a of the pulley body 5, the end cap 13 is fitted to the right end portion of the cylindrical portion 14. In this case, the following states are obtained: the two side surfaces 5b and 5c of the pulley body 5 are sandwiched and fixed by a flange portion 15 provided on the left end side of the cylindrical portion 14 and an annular support portion 16 formed on the end cover 13.

Further, on the left side of the flange portion 15 located on the outer periphery of the housing 4, 1 st and 2 nd annular step portions 17, 18 are provided in a stepped manner, and the 1 st and 2 nd annular step portions 17, 18 have the same shape as the outer peripheral portion on the bottom surface side of the truncated cone. The 2 nd annular step 18 is formed at a portion having a diameter smaller than the flange portion 15 (i.e., at a position closer to the central axis of the housing 4), and the 1 st annular step 17 is formed at a portion having a diameter smaller than the 2 nd annular step 18. The annular step portions 17 and 18 have: annular axial end faces 17a, 18a, the axial end faces 17a, 18a being orthogonal to the axial direction; and tapered outer peripheral surfaces 17b, 18b, the outer peripheral surfaces 17b, 18b being inclined with respect to the axial direction so as to be continuously expanded in diameter from the axial inner side toward the axial outer side. Thus, in the vertical cross section shown in fig. 1, the annular step portions 17 and 18 have respective end portions of acute angles toward the radial outer side formed by the axial end surfaces 17a and 18a and the outer peripheral surfaces 17b and 18 b.

As shown in fig. 4, a spiral groove 21 is formed in an abutting surface 16a of the annular support portion 16 of the end cap 13 abutting against the side surface 5c of the pulley body 5, whereby the pulley body 5 can be stably fixed. That is, the pulley body 5 formed of a highly flexible member (such as urethane) for preventing cutting of the wire or the like may be narrowed in width by centrifugal force of rotation, but even in such a case, slipping of the pulley body 5 can be prevented by the spiral groove 21. Instead of the spiral groove 21, a plurality of concentric grooves may be formed.

The bearings 2 and 3 are constituted by deep groove ball bearings with double seal rings having the same structure, and are press-fitted into a cylindrical bearing holding chamber 31 defined by the inner peripheral surface of the housing main body 11. An annular inner race 32 is interposed between the inner race 2a of the bearing 2 and the inner race 3a of the bearing 3, and the annular inner race 32 rotates together with the two inner races 2a, 3 a. An annular outer retainer 33 is interposed between the outer ring 2b of the bearing 2 and the outer ring 3b of the bearing 3, and the annular outer retainer 33 surrounds the inner retainer 32 on the outside. The bearings 2, 3 are stably held by the two collars 32, 33 at a predetermined interval in their axial directions. Here, the radial thicknesses of the inner collar 32 and the outer collar 33 are set so as to reduce the gap between the outer circumferential surface of the inner collar 32 and the inner circumferential surface of the outer collar 33 as much as possible. This can prevent the abrasive mixed liquid from being sucked from the outside even if the internal pressure is reduced due to a reduction in the temperature of the air after the rotation of the guide wheel 1 is stopped.

A plug member 41 is disposed in the housing body 11, and the plug member 41 partitions the right side of the bearing holding chamber 31. The plug member 41 has a structure in which an annular portion 41b is provided projecting leftward from a circular flat plate portion 41a, and defines a holding space for the O-ring 43 together with the inner peripheral surface of the housing main body 11 and the annular support plate 42. The plug member 41 and the O-ring prevent the abrasive grain mixture from entering the bearing holding chamber 31 from the end cover 13 side. Further, the movement of the plug member 41 to the right side is restricted by a stopper ring 45 attached to the annular groove 44 of the housing main body 11.

The housing body 11 has a shaft hole 50, and the shaft hole 50 is used for inserting the support shaft 6 mounted to the bearings 2 and 3. The shaft hole 50 opens to the left side wall of the housing main body 11, and communicates with the bearing holding chamber 31. The shaft hole 50 is defined by a tapered inner peripheral surface of the housing main body 11, and is continuously reduced in diameter toward the inside of the housing main body 11.

The bearing fitting portion 61 of the support shaft 6 is fitted into the inner rings 2a and 3a of the bearings 2 and 3, and the bearing fitting portion 61 forms the tip end side of the leg portion constituting the support shaft 6. The front end of the bearing fitting portion 61 is fixed to a fixing ring 63 by a fixing screw 62. Thereby, the bearings 2 and 3 are sandwiched and fixed between the fixed ring 63 and the front end surface of the tapered diameter-enlarged portion 64, and the tapered diameter-enlarged portion 64 is connected to the rear side of the bearing fitting portion 61. The tapered diameter-expanding portion 64 is tapered so that its tip end becomes narrower toward the bearing attachment portion 61, and the 1 st and 2 nd annular protrusions 65, 66 are provided on the outer peripheral surface of the tapered diameter-expanding portion 64 so as to be spaced apart by a predetermined interval in the axial direction. The outer peripheral surfaces 65a, 66a of the 1 st and 2 nd annular protrusions 65, 66 are formed in a tapered shape with the same inclination as the hole wall of the shaft hole 50. A screw coupling portion 68 for coupling to a guide wheel support mechanism, not shown, is provided to protrude from the head portion 67 of the support shaft 6.

In addition, a cover member 71 is attached to the left end of the tapered enlarged diameter portion 64 of the support shaft 6 so as to overlap the shaft hole 50 in a plan view (in a left side view in fig. 1). The cover member 71 is arranged to cover the entire shaft hole 50 together with the support shaft 6. The cover member 71 has a structure in which a mounting hole 72 is formed in the center of the circular plate, and the tapered enlarged diameter portion 64 is fitted into the mounting hole 72. The cover member 71 has a diameter larger than the 1 st annular step portion 17, and the outer peripheral edge 73 of the cover member 71 is curved in a direction approaching the housing body 11 so as to cover the 1 st annular step portion 17. An outer peripheral end 73a of the outer peripheral edge 73 is disposed close to the axial end face 18a of the 2 nd annular step portion 18.

The guide wheel 1 having the above-described structure is used in an environment where the abrasive grain mixture of the wire saw falls. However, when the abrasive grain mixture liquid that attempts to enter the shaft hole 50 from the outer peripheral side of the housing 4 flows along the 1 st and 2 nd annular step portions 17 and 18 provided on the opening end side of the shaft hole 50, the abrasive grain mixture liquid is guided radially outward (i.e., in a direction away from the shaft hole 50) by the centrifugal force generated by the rotating housing 4. The cover member 71 prevents the mixed abrasive grain liquid that attempts to enter the shaft hole 50 from the side (left side) of the housing 4. Even when the mixed abrasive grain liquid passes between the housing main body 11 and the cover member 71 and enters the shaft hole 50, the mixed abrasive grain liquid is guided along the inclined hole wall of the shaft hole 50 in the direction of being discharged to the outside of the housing 4 (leftward) by the centrifugal force generated by the rotating housing 4.

After passing between the housing main body 11 and the cover member 71, the abrasive grain mixture liquid that attempts to enter the shaft hole 50 along the outer peripheral surface of the support shaft 6 is guided toward the hole wall of the shaft hole 50 by the 1 st and 2 nd annular projections 65 and 66 provided on the support shaft 6, and finally guided in the direction of being discharged to the outside of the housing 4.

An air pressure supply passage 81 is provided in the support shaft 6, and the air pressure supply passage 81 supplies air to the bearings 2 and 3. The air pressure supply passage 81 extends from an opening 81a provided in the threaded coupling portion 68 to an opening 81b provided between the 1 st annular projection 65 and the 2 nd annular projection 66 of the tapered diameter-enlarged portion 64.

Here, the outer peripheral surface 65a of the 1 st annular projecting portion 65 is disposed close to the hole wall of the shaft hole 50, while the outer peripheral surface 66a of the 2 nd annular projecting portion 66 is disposed at a larger interval from the hole wall of the shaft hole 50 than the outer peripheral surface 65 a. This prevents the abrasive grain mixture liquid from entering the bearing holding chamber 31 along the outer peripheral surface of the support shaft 6, and does not interfere with the supply of the air discharged from the opening 81 b. Further, by supplying air, not only centrifugal force but also the effect of air pressure can be added, and the mixed abrasive liquid that has entered can be discharged to the outside by flowing back, and the mixed abrasive liquid can be prevented from entering the bearing holding chamber 31.

In this case, oil mist (lubricant-containing air) can also be supplied from the air pressure supply passage 81. In the case of oil mist, even when the housing 4 is rotating, the supply can be performed without being affected by the centrifugal force, and there is an advantage that the space between the hole wall of the shaft hole 50 and the outer peripheral surface of the tapered diameter-enlarged portion 64 is filled with oil mist, and the mixed abrasive grain liquid and the like can be prevented from entering the space. In the case of oil mist, even if the temperature decreases after the stator 1 stops rotating, the pressure of the oil mist decreases less than that of air, and therefore, there are the following advantages: the suction of the abrasive grain mixture liquid from the outside due to the decrease in the internal pressure can be effectively suppressed. Further, in the case of oil mist, the rust prevention effect of the bearings 2 and 3 can be expected.

< embodiment 2 >

Next, the structure of the guide wheel according to embodiment 2 of the present invention will be described with reference to fig. 5. In embodiment 2, the same components as those in embodiment 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

The guide wheel 1 of embodiment 2 is the same as that of embodiment 1 except for the structure of the cover member 71. In fig. 5, the cover member 71 has a larger diameter than the flange 15, and the outer peripheral edge 73 of the cover member 71 is curved in a direction approaching the housing body 11 so as to cover not only the 1 st and 2 nd annular step portions 17 and 18 but also the flange 15. The outer peripheral end 73a of the outer peripheral edge 73 is disposed near the center in the width direction of the outer peripheral surface of the flange 15. By enlarging the area of the housing main body 11 covered by the cover member 71 in this way, the mixed abrasive grain liquid can be more effectively prevented from entering the bearing holding chamber 31.

< embodiment 3 >

Next, the structure of the guide wheel according to embodiment 3 of the present invention will be described with reference to fig. 6. In embodiment 3, the same components as those in embodiment 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

The guide wheel 1 according to embodiment 3 is similar to embodiment 1 except that it has a configuration in which the 1 st and 2 nd annular step portions 17 and 18 (see fig. 1) and the like of embodiment 1 are replaced in order to prevent the mixed abrasive grain solution from entering the shaft hole 50. More specifically, as shown in fig. 6, an annular projecting portion 91 is provided on the left side portion of the housing 4, and the annular projecting portion 91 surrounds the opening of the shaft hole 50 from the outside and projects in the direction (leftward direction) opposite to the insertion direction of the support shaft 6. The outer peripheral surface 91a of the annular projecting portion 91 is formed to be connected to the cylindrical portion 14 of the housing main body 11 via the flange portion 15. The inner circumferential surface 91b of the annular projecting portion 91 is tapered and inclined with respect to the axial direction so as to be continuously expanded radially from the axially inner side toward the radially outer side. The cover member 71 is disposed on the inner peripheral side of the annular projecting portion 91, and the distal end portion 91c of the annular projecting portion 91 is positioned further to the left beyond the cover member 71. In the cover member 71, the outer peripheral end 73a of the curved outer peripheral edge 73 is gently inserted into the annular groove 92 provided on the inner peripheral side of the annular protrusion 91.

In the guide wheel 1 according to embodiment 3, when the mixed abrasive grain liquid that attempts to enter the shaft hole 50 from the outer peripheral side of the housing 4 flows along the annular protrusion 91 provided on the opening end side of the shaft hole 50, the mixed abrasive grain liquid is guided radially outward (i.e., in a direction away from the shaft hole 50) by the centrifugal force generated by the rotating housing 4. In particular, since the abrasive grain mixture liquid that attempts to intrude into the inside of the annular protrusion 91 (in this case, the gap between the annular protrusion 91 and the cover member 71) is guided along the tapered inner circumferential surface 91b to the end 91c side of the annular protrusion 91 (outside of the housing 4), the abrasive grain mixture liquid can be more effectively prevented from intruding into the axial hole 50 side.

The guide wheel 1 of embodiment 3 of fig. 6 shows an example in which the above-described air pressure supply passage 81 (see fig. 1) is omitted, and even in such a configuration, intrusion of the abrasive grain mixture liquid can be prevented more effectively than in the conventional guide wheel. By omitting the air pressure supply passage 81, there are the following advantages: and a facility for supplying air is not required, and the running cost such as electricity fee or the burden on the environment can be reduced. Further, as in embodiment 3, the air pressure supply passage 81 can be omitted in embodiments 1 and 2 described above.

The present invention has been described in detail based on specific embodiments, but the above embodiments are merely examples, and the present invention is not limited to these embodiments. For example, the guide roller of the present invention can prevent not only the abrasive grain mixture liquid but also other liquid such as water from entering the bearing holding chamber 31. The arrangement and number of the annular step portion of the housing body 11 or the annular projecting portion of the support shaft can be variously changed.

The respective components of the guide pulley of the present invention shown in the above embodiments are not necessarily all necessary, and can be appropriately selected at least without departing from the scope of the present invention. For example, the annular projection provided on the support shaft, the cover member attached to the housing, and the like may be omitted as appropriate.

Description of the reference symbols

1: a guide wheel;

2. 3: a bearing;

4: a housing;

5: a pulley body;

6: a support shaft;

11: a housing main body;

13: an end cap;

14: a barrel portion;

15: a flange portion;

16: an annular support portion;

17: the 1 st annular step part;

18: a 2 nd annular step portion;

31: a bearing holding chamber;

50: a shaft hole;

61: a bearing fitting portion;

64: a tapered diameter-expanding portion;

65: the 1 st annular projection;

66: a 2 nd annular projection;

71: a cover member;

91: an annular protrusion;

91 b: an inner peripheral surface.

Claims (5)

1. A kind of guide wheel, which is composed of a guide wheel,

the guide pulley is provided with:

a bearing; and

a housing that holds the bearing in its interior and has a shaft hole into which a support shaft attached to the bearing is inserted,

the shaft hole has a tapered hole wall and is continuously reduced in diameter toward the inside of the housing,

the guide wheel is characterized in that,

the support shaft has an annular protrusion extending in a circumferential direction of an outer peripheral surface of the support shaft and protruding from the outer peripheral surface toward the tapered hole wall.

2. The jockey wheel of claim 1,

the guide wheel further includes a cover member attached to the support shaft and disposed to overlap the shaft hole in a plan view.

3. The jockey wheel according to claim 1 or 2,

the housing has an annular step portion on an outer periphery thereof, the annular step portion having a tapered peripheral surface and continuously expanding in diameter outward in the axial direction.

4. The jockey wheel according to claim 1 or 2,

the housing is provided with an annular protruding portion that surrounds an opening of the shaft hole from the outside and protrudes in a direction opposite to the insertion direction of the support shaft.

5. The jockey wheel of claim 4,

the annular protrusion has a tapered inner circumferential surface that is continuously expanded in diameter toward the outside in the axial direction.