JP5974799B2 - Grease structure for rolling bearings - Google Patents

Description

  The present invention relates to a grease supply structure for a rolling bearing in which grease is supplied to a raceway surface.

  For example, in a ball bearing as shown in Patent Document 1, an outer ring and an outer ring positioning spacer are arranged side by side in the axial direction, a grease pool forming body is arranged on the inner peripheral side of the outer ring and the outer ring positioning spacer, and the outer ring or outer ring positioning is arranged. Spacer and grease reservoir formation A grease reservoir is formed between the main body, grease is supplied to the grease reservoir from the greasing hole formed on the end face of the outer ring positioning spacer, and the ball is inserted from the gap between the tip of the outer ring positioning spacer and the outer ring. Grease is being supplied to

  In the ball bearing shown in Patent Document 1, a housing is disposed on the outer periphery of the outer ring, a rotation shaft is disposed on the inner periphery of the inner ring, and grease is supplied from an end surface. A rotary table is provided on one end surface of the outer ring. The fixed main body is disposed on the other end face of the inner ring, and grease is not supplied from the outer periphery of the outer ring.

  Ball bearings of the type that supply grease from the outer periphery of the outer ring have a greasing hole extending in the inner diameter direction from the outer periphery of the outer ring to the outer ring side raceway surface. A plurality of the greasing holes are formed in the circumferential direction.

JP 2008-309261 A

  During ball bearing maintenance, an operator replenishes grease through a greasing hole using a grease gun. There is a limit to the number of greasing holes that an operator can replenish. Further, since the rotary table is not actively rotated as compared with the rotary shaft, there is a problem that the grease does not sufficiently reach the raceway surface. The present invention has been made to solve the above-described problems, and the object of the present invention is to provide a rolling bearing that can sufficiently spread grease to the raceway surface without increasing the burden on the operator. Provides a fat structure.

  According to the first aspect of the present invention, an outer ring having an outer ring side raceway surface formed on the inner periphery, an inner ring having an inner ring side raceway surface formed on the outer periphery, the outer ring side raceway surface and the inner ring side raceway surface rolling A rolling bearing comprising a plurality of rolling elements disposed in a circumferential direction, wherein the outer ring side raceway surface and the rolling elements are lubricated with grease between the inner ring side raceway surface and the rolling elements. A first oil supply hole extending in the inner diameter direction from the outer periphery is formed on the outer ring, and a fat reservoir extending in the circumferential direction connected to the inner diameter side of the first grease supply hole is formed in the outer ring, and the inner diameter of the oil reservoir is formed in the outer ring. A second greasing hole and a third greasing hole which are connected to the side and extend in the inner diameter direction are formed, and the second greasing hole and the third greasing hole are formed so as to be shifted from each other in the circumferential direction. The flow resistance of the second greasing hole close to the greasing hole is far from the first greasing hole. It is characterized in that it has increased serial third than the flow path resistance of the greasing hole.

  ADVANTAGE OF THE INVENTION According to this invention, the grease supply structure of a rolling bearing which can fully spread | grease grease to a track surface can be provided, without increasing an operator's burden.

It is a front view of the rolling bearing in one embodiment of the present invention. It is a partial expanded sectional view of the rolling bearing in one Embodiment of this invention. It is the sectional view on the AA line of FIG. 2 in one Embodiment of this invention.

  An embodiment of the present invention will be described with reference to FIGS. 1 to 3. 1 is a front view of a rolling bearing, FIG. 2 is a partially enlarged sectional view of the rolling bearing, and FIG. 3 is a sectional view taken along line AA of FIG.

  The rolling bearing 10 shown in FIGS. 1 to 3 is both a swivel bearing and a ball bearing. The ball bearing 10 includes a ring-shaped outer ring 11, a ring-shaped inner ring 20 disposed on the inner peripheral side of the outer ring 11, a plurality of balls 30 disposed in the circumferential direction between the outer ring 11 and the inner ring 20, and a pair of The separator 60 is disposed between the balls 30. The outer ring 11, the inner ring 20, and the ball 30 are all made of a metal material, and particularly iron-based materials are often used. The separator 60 is made of a resin material.

  As shown in FIG. 3, an outer ring side raceway surface 13 having a semicircular cross section is formed on the inner circumference of the outer ring 11, and an annular outer ring side recessed toward the outer diameter side in the middle of the outer ring side raceway surface 13 in the axial direction. A recess 12 is formed.

  As shown in FIGS. 2 and 3, the outer ring 11 has a ring-shaped outer member for processing a first greasing hole 15, a fat reservoir 16, a second greasing hole 17 and a third greasing hole 18 which will be described later. 11a and a ring-shaped inner member 11b. After processing the 1st greasing hole 15 and the oil reservoir 16 in the outer side member 11a, and processing the 2nd greasing hole 17 and the 3rd greasing hole 18 in the inner side member 11b, the outer side member 11a is thermally expanded, and an outer side member is processed. By arranging the inner member 11b on the inner peripheral side of 11a and thermally contracting the outer member 11b, the inner member 11b is fitted to the outer member 11a with a tightening margin.

  As shown in FIG. 3, an inner ring side raceway surface 23 having a semicircular cross section is formed on the outer periphery of the inner ring 20, and an annular inner ring side recess 22 that is recessed toward the inner diameter side in the middle of the inner ring side raceway surface 23 in the axial direction. Is formed.

  The ball 30 has a spherical shape, and a rolling surface that rolls on the outer ring side raceway surface 13 and the inner ring side raceway surface 23 is formed on the outer periphery.

  As shown in FIG. 2, the separator 60 is disposed between a pair of balls 30 and has a function of arranging a plurality of balls 30 at equal intervals in the circumferential direction of the inner ring 20. On the side surface of the separator 60 on the ball 30 side, a semicircular sliding contact surface with which the ball 30 is in sliding contact is formed.

  The outer ring 11 and the inner ring 20 are offset from each other in the axial direction. The outer ring 11 projects to one side in the axial direction, and the inner ring 20 projects to the other side in the axial direction. An annular seal groove is formed on the inner circumference of one side of the outer ring 11 in the axial direction, and the seal member 40 is fitted in the seal groove. The lip portion on the inner peripheral side of the seal member 40 is in sliding contact with one end surface in the axial direction of the inner ring 20. An annular seal groove is formed on the outer periphery on the other side of the inner ring 20 in the axial direction, and a seal member 41 is fitted in the seal groove. The lip portion on the outer peripheral side of the seal member 41 is in sliding contact with the other end surface in the axial direction of the outer ring 11. The seal members 40 and 41 prevent the grease 50 between the outer ring 11 and the inner ring 20 from leaking to the outside.

  As shown in FIGS. 2 and 3, the outer ring 11 is formed with a plurality of mounting holes 19 penetrating in the axial direction, and a plurality of mounting holes 19 are formed at equal intervals in the circumferential direction. Only a part of the plurality of mounting holes 19 is selected and used for mounting a rotary table (not shown) placed on the end face of the outer ring 11.

  Mounting holes 29 are formed in the inner ring 20 so as to penetrate in the axial direction, and a plurality of mounting holes 29 are formed at equal intervals in the circumferential direction. Only a part of the plurality of mounting holes 29 is selected and used for mounting to a fixed body (not shown) arranged on the end face of the inner ring 20.

  In FIG. 3, the ball bearing 10 is placed on the fixed body so that the end surface on the side where the outer ring 11 protrudes from the inner ring 20 is the upper surface, and the end surface on the side where the inner ring 20 protrudes from the outer ring 11 is the lower surface. The inner ring 20 is attached to the fixed main body, and the rotary table is attached to the outer ring 11 such that the rotary table is placed on the ball bearing 10.

  As shown in FIGS. 1 to 3, the grease supply structure of the ball bearing 10 has a function of supplying grease from the outside to the outer ring side raceway surface 13 and the inner ring side raceway surface 23, and extends in the inner diameter direction from the outer periphery. A greasing hole 15, a fat reservoir 16 connected to the inner diameter side of the first greasing hole 15 and extending in the circumferential direction, a second greasing hole 17 connected to the inner diameter side of the grease reservoir 15 and extending in the inner diameter direction, and the third And a greasing hole 18.

  As shown in FIGS. 2 and 3, the first greasing hole 15 and the second greasing hole 17 are arranged coaxially with each other, and the third greasing hole 18 is formed on the inner ring 20 with respect to the second greasing hole 17. It is arranged on both sides in the circumferential direction. In other words, the first greasing hole 15 and the second greasing hole 17 are disposed in the middle in the circumferential direction of the fat reservoir 16, and the third greasing holes 18 are disposed on both sides in the circumferential direction of the fat reservoir 16.

  The hole diameter of the second greasing hole 17 is smaller than the hole diameter of the third greasing hole 18, and the flow resistance of the second greasing hole 17 close to the first greasing hole 15 is the first greasing hole. The flow resistance of the third greasing hole 18 far from 15 was made larger. By doing so, the amount of grease supplied from the second grease supply hole 17 to the outer ring side depression 12 and the amount of grease supplied from the third grease supply hole 18 to the outer ring side depression 12 become substantially equal.

  As shown in FIG. 1, one set of one greasing hole 15, one grease reservoir 16, one second greasing hole 17, and two third greasing holes 18. A greasing structure is configured, and six sets of greasing structures are arranged in the circumferential direction of the inner ring 20.

  As shown in FIGS. 2 and 3, a screw hole is formed at one end on the outer peripheral side of the first greasing hole 15, and a grease nipple (not shown) is screwed into the screw hole. The grease nipple has a function as a check valve, and contains a ball as a valve and a spring for urging the ball in a direction in close contact with the valve seat. When the tip of a grease gun (not shown) is brought into close contact with one end of the grease nipple and the grease is pumped from the grease gun to the grease nipple, the ball overcomes the spring and leaves the valve seat so that the grease is supplied to the grease nipple. It has become.

  Next, the operation of the ball bearing 10 will be described based on the configuration described above.

  When the outer ring 11 rotates with respect to the inner ring 20, the balls 30 move in the same direction as the rotation direction of the outer ring 11 while rolling on the outer ring side raceway surface 13 and the inner ring side raceway surface 23. The separator 60 between the pair of balls 30 also moves in the same direction as the rotation direction of the outer ring 11.

  As one of the maintenance operations of the ball bearing 10, there is a grease replenishment operation. The grease replenishing operation will be described.

  The operator holds the grease gun and attaches the tip of the grease gun to one end of the grease nipple. When the operator pulls the lever of the grease gun, the grease 50 is pumped from the grease gun to the grease nipple. The ball in the grease nipple is separated from the valve seat by the pressure feeding of the grease 50, and the grease 50 of the grease gun is supplied to the first greasing hole 15 through the grease nipple. The grease 50 supplied to the first greasing hole 15 is supplied to the outer ring side depression 12 through the fat reservoir 15 and the second greasing hole 17. Further, the grease 50 supplied to the first greasing hole 15 is supplied to the outer ring side depression 12 through the fat reservoir 15 and the third greasing hole 18.

  The flow resistance of the second greasing hole 17 close to the first greasing hole 15 was made larger than the flow resistance of the third greasing hole 18 far from the first greasing hole 15. By doing so, the amount of grease supplied from the second grease supply hole 17 to the outer ring side depression 12 and the amount of grease supplied from the third grease supply hole 18 to the outer ring side depression 12 become substantially equal.

  The grease 50 supplied to the outer ring side recess 12 is supplied between the balls 30 and the outer ring side raceway surface 13 and between the balls 30 and the separator 60. The grease 50 is further supplied between the ball 30 and the separator 60 to the inner ring side recess 22 and to the ball and the inner ring side raceway surface 23.

  Thus, the grease 50 is supplied to one set of the greasing structure, and the grease 50 is supplied to the outer ring side recess 12 near the one set of the greasing structure.

  The same operation is repeated for the remaining five sets of the greasing structure. The grease 50 is supplied to the outer ring side recess 12 near each grease supply structure. As a result, the grease 50 is supplied over the entire circumferential direction of the outer ring side recess 12. In other words, with the operation of supplying the grease 50 to the six first grease holes 15, the grease 50 is supplied from the six second grease holes 17 and the twelve third grease holes 18 to the outer ring side recess 12. Supplied. Thus, the grease 50 is sufficiently distributed to the outer ring side raceway surface 13 and the inner ring side raceway surface 23 without increasing the burden on the operator.

  The present invention is not limited to these embodiments, and can of course be implemented in various modes without departing from the gist of the present invention.

  In the embodiment described above, six sets of grease supply structures are arranged in the circumferential direction of the outer ring 11. As another embodiment, four sets of greasing structures may be arranged in the circumferential direction of the outer ring 11, and five sets of greasing structures may be arranged in the circumferential direction of the outer ring 11.

  In the embodiment described above, the above-described greasing structure is applied to a ball bearing that uses balls as rolling elements. As another embodiment, the above-described greasing structure may be applied to a roller bearing using rollers as rolling elements. In this case, the rotation axis of the roller is arranged in a state inclined by 45 degrees with respect to the rotation axis of the outer ring.

DESCRIPTION OF SYMBOLS 11: Outer ring, 12: Outer ring side raceway surface, 15: 1st greasing hole, 16: Grease reservoir, 17: 2nd greasing hole, 18: 3rd greasing hole, 20: Inner ring, 23: Inner ring side raceway surface , 30: Ball (rolling element), 50: Grease

Claims (1)

An outer ring having an outer ring side raceway surface formed on the inner periphery, an inner ring having an inner ring side raceway surface formed on the outer periphery, and a plurality of rolling elements arranged in a circumferential direction by rolling the outer ring side raceway surface and the inner ring side raceway surface. A rolling bearing comprising a moving body, wherein the outer ring side raceway surface and the rolling elements are lubricated with grease between the inner ring side raceway surface and the rolling elements, and the outer ring has a first extending in an inner diameter direction from an outer periphery. A grease supply hole is formed, a grease reservoir extending in a circumferential direction connected to the inner diameter side of the first grease supply hole is formed in the outer ring, and a grease reservoir extending in the inner diameter direction is connected to the inner diameter side of the grease reservoir in the outer ring. The second greasing hole and the third greasing hole are formed, the second greasing hole and the third greasing hole are formed so as to be shifted in the circumferential direction, and the second greasing hole close to the first greasing hole is formed. The flow resistance of the grease hole is the flow resistance of the third grease hole far from the first grease hole. Lubrication structure of the rolling bearing which is also characterized by being greatly Ri.

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