JP2013060957A - Rolling bearing with seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a rolling bearing with a non-contact seal type seal from extraordinarily wearing.SOLUTION: In the rolling bearing with the seal that includes an outer race 41, an inner race 50 that is disposed on inner peripheral side of the outer race 41, rolling elements 70 that are disposed between the outer race 41 and the inner race 50 and roll relative to them and a sealing member 71 that seals between the outer race 41 and the inner race 50 and of which the sealing member 71 forms a labyrinth seal 78 between the rotating race being one of the outer race 41 and the inner race 50 and itself, it is configured to provide on side face on the opposite side of the rolling elements 70 of the sealing member 71 a catch portion 73 that catches and stores scattering oil and to provide a magnet 74 inside the catch portion 73 and to provide on the sealing member 71 an introduction port 75 that introduces the oil within the catch portion 73 to interior space surrounded by the outer race 41, the inner race 50 and the sealing member 71.

Description

  The present invention relates to a non-contact seal type rolling bearing with a seal.

  The rolling bearing with seal shown in FIG. 5 (Patent Document 1) has a cylindrical roller 120 that rolls between the outer ring 100 and the inner ring 110, and annular grooves 101 are formed at both axial ends of the inner circumference of the outer ring 100. The seal member 130 is press-fitted and fixed to the head. A lip portion 135 on the inner peripheral side of the seal member 130 is in sliding contact with the outer periphery of the inner ring 110. As shown in FIGS. 5 and 6, the thick wall 131 on the outer peripheral side of the seal member 130 is formed with an axial groove 132 communicating in the axial direction at one circumferential position on the outer peripheral surface. A radial groove 133 communicating in the radial direction at two locations on the circumference is formed on the side surface. The axial groove 132 and the radial groove 133 are used to adjust the internal pressure of the inner space 140 surrounded by the outer ring 100, the inner ring 110, and the seal member 130, but the rolling bearing is used to support the rotation shaft of the gear of the transmission. When used for the above, the axial groove 132 and the radial groove 133 can be used as a passage for guiding the mission oil to the space 140.

Japanese Utility Model Publication No. 5-79049

  In this case, the mission oil splashed by the gears in the transmission flows into the internal space 140 through the axial groove 132 and the radial groove 133, but the mission oil is not easily in the axial groove 132. Since it does not enter, the mission oil flowing into the internal space 140 is insufficient, which is not preferable in terms of preventing abnormal wear of the rolling bearing.

  The mission oil circulates in the order of the tank, filter, pump, and each part of the mission. The transmission has a plurality of gears that mesh with each other, and metal dust (foreign matter) is generated due to the meshing of the gears. In the initial stage of using the transmission, since the gears are not familiar with each other, a large amount of metal waste is generated and the metal waste is captured by the filter. As the gears become familiar with each other, the generation of metal scraps decreases. It is not preferable that mission oil mixed with metal debris enters the space 140 through the axial groove 132 and the radial groove 133 at the initial stage when the transmission is used from the viewpoint of preventing abnormal wear of the rolling bearing. The present invention has been made to solve the above-described problems, and an object of the present invention is to prevent abnormal wear of the rolling bearing. That is, abnormal wear of the outer ring 100, the inner ring 110, and the cylindrical roller 120 is prevented.

The invention according to claim 1 includes an outer ring, an inner ring disposed on an inner peripheral side of the outer ring, a rolling element that is disposed between the outer ring and the inner ring and rolls against the outer ring, and between the outer ring and the inner ring. In the rolling bearing with seal in which the labyrinth seal is formed between the rotating rings of the outer ring and the inner ring,
A catch portion for catching and storing the scattered oil is provided on the side surface of the seal member opposite to the rolling element, a magnet is provided in the catch portion, and the oil in the catch portion is supplied to the outer ring, the seal member. An introduction port that leads to an inner space surrounded by an inner ring and the seal member is provided.

  According to the present invention, since the scattered oil is received by the catch portion, the oil necessary for lubrication can be secured, and abnormal wear of the rolling bearing can be prevented. In addition, the metal scrap in the oil is attracted to the magnet in the catch portion, and the oil with less metal scrap can be supplied to lubrication, so that abnormal wear of the rolling bearing can be prevented.

It is a longitudinal cross-sectional view of the transmission in one Embodiment of this invention. It is the sectional view on the AA line of FIG. 1 in one Embodiment of this invention. It is a principal part enlarged view of FIG. 1 in one Embodiment of this invention. It is a principal part enlarged view of FIG. 2 in one Embodiment of this invention. It is a longitudinal cross-sectional view of the conventional rolling bearing with a seal. It is a side view of the thick part of the oil seal of the conventional rolling bearing with a seal.

  An embodiment of the present invention will be described with reference to FIGS. 1 is a longitudinal sectional view of the transmission, FIG. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 is an enlarged view of the main part of FIG. 1, and FIG. is there.

  1 and 2, the transmission 10 has an aluminum mission case 11. The mission case 11 is integrally formed with a cylindrical boss portion 12, and a fitting hole 13 having a circular cross section is formed in the boss portion 12. A steel-made cylindrical reinforcing member 15 is press-fitted and fixed in the fitting hole 13, and a rolling bearing 40 with a seal is fitted to the reinforcing member 15 with a gap in the radial direction. A ring groove 16 is formed on the inner periphery of the reinforcing member 15, and a retaining ring 34 is fitted in the ring groove 16. On the outer periphery of the outer ring 41 of the rolling bearing 40 with seal, an engagement groove 45 is formed at a position corresponding to the ring groove 16, and the retaining ring 34 is engaged with the engagement groove 45. That is, the retaining ring 34 exists at a position straddling the ring groove 16 and the engaging groove 45, and the retaining ring 34 itself has an elastic force to reduce in the radial direction.

  The rotary shaft 20 is fitted to the inner ring 50 of the roller bearing 40 with seal, and the first fitted portion 21, the spline 22, and the second fitted piece are fitted to the outer periphery of the rotary shaft 20. The part 23 is formed in order from the boss part 12. A screw hole 24 is formed at one end of the rotating shaft 20 on the boss portion 12 side, and the clamping member 30 is screwed into the screw hole 24. The clamping member 30 has a flange portion expanded in the outer diameter direction, and the side surface of the inner ring 50 is in contact with the flange portion.

  A first gear 32 and a second gear 33 are spline-fitted to the spline 22 of the rotary shaft 20 so that the first gear 32 and the second gear 33 rotate integrally with the rotary shaft 20. . A spacer 31 is fitted into the second fitted portion 23 of the rotary shaft 20, and the rolling bearing 40 with seal, the first gear 32, and the second gear 33 are connected to the flange portion and the spacer of the holding member 30. 31. The first gear 32 meshes with a third gear 35 that rotates about an axis parallel to the rotation shaft 20. In the mission case 11, the mission oil 80 is contained up to a position where the first gear 32, the second gear 33, and the third gear 35 are placed under the first gear 32. And the smooth engagement of the third gear 35 is made. Further, the mission oil 80 in the mission case 11 is swept up by the first gear 32, the second gear 33, and the third gear 35, and is scattered as particles in each part.

  The non-contact seal type rolling bearing with seal shown in FIG. 1 is a ball bearing 40 using balls as rolling elements. The ball bearing 40 includes a ring-shaped outer ring 41, a ring-shaped inner ring 50 disposed on the inner peripheral side of the outer ring 41, a ring-shaped cage 60 disposed between the outer ring 41 and the inner ring 50, and a cage 60. And a plurality of balls 70 held by the seal members 71 and 79 provided on both sides of the balls 70. The seal member 71 is provided on the side of the first gear 32 with respect to the ball 70, and the seal member 79 is provided on the side opposite to the first gear 32 with respect to the ball 70.

  As shown in FIGS. 1 and 3, an outer ring side raceway surface 42 having a circular arc shape is formed on the inner periphery of the outer ring 41, and a step 44 and an annular groove 43 are formed on both sides of the outer ring side raceway surface 42 in this order. Is formed. The step portion 44 is formed in the radial direction, and an annular groove 43 is formed on the outer diameter side of the step portion 44. The step portion 44 and the annular groove 43 are formed so as to be symmetric with respect to the outer race side raceway surface 42. An inner ring side raceway surface 52 having a circular arc cross section is formed on the outer periphery of the inner ring 50, and sliding surfaces 53 are formed on both sides of the inner ring side raceway surface 52. The sliding surface 53 has a surface parallel to the axis of the inner ring 50.

  The cage 60 has a plurality of pocket portions 61 in the circumferential direction, and a ball 70 is rotatably held in each pocket portion 61. The ball 70 is made of metal and has a spherical shape.

  As shown in FIGS. 3 and 4, the seal member 71 includes a seal body 72 extending in the radial direction, a catch portion 73 provided on a side surface of the seal body 72 opposite to the ball 70, and a catch portion 73. And an introduction port 75 provided in the seal main body 72. A labyrinth seal 78 is provided between the inner periphery of the seal body 72 and the sliding surface 53 of the inner ring 50.

  The catch portion 73 is provided on the upper portion of the seal member 71 and has a box shape opened upward so that the scattered mission oil 80 can be caught. Therefore, the catch portion 73 has a function of catching and storing the mission oil 80 that is scattered.

  The magnet 74 is attached perpendicularly to the bottom of the catch portion 73 and has a partition function that divides the storage space of the catch portion 73 into two in the axial direction of the outer ring 41. That is, the storage space in the catch portion 73 is divided by the magnet 74 into a first storage space 76 on the opposite side of the ball 70 from the magnet 74 and a second storage space 77 on the ball 70 side of the magnet 74. . The magnet 74 has a function of adsorbing metal waste of the mission oil 80 in the first storage space 76, and has a function of adsorbing metal waste of the mission oil 80 in the second storage space 77, and It has a function of adsorbing the metal waste of the mission oil 80 that climbs from the first storage space 76 to the second storage space 77. The introduction port 75 is formed at a position corresponding to the upper part of the second storage space 77. One of the introduction ports 75 opens to the upper part of the second storage space 77, and the other opens to an internal space surrounded by the outer ring 41, the inner ring 50 and the seal member 71.

  A baffle plate 85 is disposed above the magnet 74, and the baffle plate 85 is attached to the outer ring 41 by fitting the pin portion of the baffle plate 85 into the pin hole of the outer ring 41. The baffle plate 85 extends in the radial direction from the outer ring 41 to the vicinity of the magnet 74. The baffle plate 85 has a function of preventing the scattered mission oil 80 from directly entering the introduction port 75 and guiding the mission oil 80 adhering to the baffle plate 85 to the first storage space 76.

  The seal member 79 is only a seal body 72 extending in the radial direction, and a labyrinth seal 78 is provided between the inner periphery of the seal body 72 and the sliding surface 53 of the inner ring 50.

  The seal body 72 and the catch portion 73 are made of rubber and are integrally formed by injection molding. The baffle plate 85 is also made of rubber and is integrally formed by injection molding.

  As shown in FIG. 3, grease 82 is injected between the outer ring 41 and the cage 60 and between the cage 60 and the inner ring 50. In the initial stage of use, the grease 82 lubricates the space between the outer ring 41 and the ball 70 and between the ball 70 and the inner ring 50, and flows into the inner space surrounded by the outer ring 41, the inner ring 50 and the seal member 71 through the introduction port 75. In addition, the grease 82 is gradually dissolved in the mission oil 80.

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

  As shown in FIG. 1, the outer ring 41, the cage 60, and the inner ring 50 are arranged coaxially, the cage 60 is tilted with respect to the inner ring 50, and the outer ring 41 is further tilted with respect to the cage 60. The operation of inserting the ball 70 into the pocket portion 61 of the cage 60 and rotating the cage 60 to insert the ball 70 into the vacant pocket portion 61 is repeated. As shown in FIG. 3, grease 82 is injected between the outer ring 41 and the cage 60 and between the cage 60 and the inner ring 50 using a grease gun. The seal members 71 and 78 are fitted into the annular groove 43 of the outer ring 41 and the baffle plate 85 is attached to the outer ring 41 to complete the assembling operation of the ball bearing 10.

  Next, the transmission assembly operation will be described.

  As shown in FIG. 1, a spacer 31 is fitted to the second fitted portion 23 of the rotary shaft 20, and the first gear 32 and the second gear 33 are spline fitted to the spline 22, and the second The inner ring 50 of the ball bearing 10 is fitted into the fitted portion 23, and the clamping member 30 is screwed into the screw hole 24. Accordingly, the ball bearing 10, the first gear 32, and the second gear 33 are clamped by the flange portion and the spacer 31 of the clamping member 30.

  A steel-made cylindrical reinforcing member 15 is press-fitted into the fitting hole 13 of the boss portion 12, and a retaining ring 34 is fitted into the ring groove 16 of the reinforcing member 15. The ball bearing 10 integrated with the rotating shaft 20 is inserted into the reinforcing member 15, the retaining ring 34 is radially expanded toward the ring groove 16 by the outer ring 41 of the ball bearing 10, and the retaining ring 34 corresponds to the engaging groove 45. Then, the retaining ring 34 is contracted in the radial direction, and the retaining ring 34 is engaged with the engagement groove 45. At this time, the retaining ring 34 is located at a position straddling the ring groove 16 and the engagement groove 45, and the ball bearing 10 is prevented from coming off from the reinforcing member 15. When the assembly of the other parts of the transmission 10 is completed, the extent that the mission oil 80 is applied to the lower portions of the first gear 32, the second gear 33, and the third gear 35 into the mission case 11 as shown in FIG. Until injected.

  When the rotating shaft 20 is rotated in such a state, as shown in FIGS. 1 and 2, the first gear 32 and the third gear 34 rotate in opposite directions while meshing with each other. At this time, as shown in FIGS. 1 and 3, the inner ring 50 also rotates with respect to the outer ring 41, the balls 70 roll on the outer ring side raceway surface 42 and the inner ring side raceway surface 52, and the balls 70 rotate in the rotational direction of the inner ring 50. Move in the same direction. The cage 60 that holds the ball 70 also moves in the same direction as the ball 70. The space between the outer ring 41 and the seal member 71 is sealed by press-fitting the seal member 71 into the annular groove 43. The inner ring 50 and the seal member 71 are sealed with a labyrinth seal 78 formed therebetween.

  As shown in FIGS. 1 and 3, in the initial stage of starting the transmission 10, the grease 82 lubricates between the outer ring 41 and the ball 70 and between the ball 70 and the inner ring 50. The mission oil 80 lifted up by the first gear 32, the second gear 33, and the third gear 34 is scattered, and a part of the scattered mission oil 80 is caught by the first storage space 76. By catching the mission oil 80 scattered in the first storage space 76, the mission oil 80 necessary for lubricating the ball bearing 10 described later can be secured.

  The mission oil 80 contains a large amount of metal debris (foreign matter) generated by the meshing of the first gear 32 and the third gear 34. These are captured by the filter in the middle of the circulation path by the circulation of the mission oil 80. Further, as shown in FIGS. 3 and 4, the metal scrap of the mission oil 80 stored in the first storage space 76 and the second storage space 77 is attracted to the magnet 74. Further, the metal waste of the mission oil 80 is attracted to the magnet 74 when the first storage space 76 gets over the second storage space 77. The mission oil 80 that has flowed into the second storage space 77 flows into the internal space surrounded by the outer ring 41, the inner ring 50, and the seal member 71 via the introduction port 75.

  When the elapsed use time of the transmission 10 exceeds a certain level, the first gear 32 and the third gear 34 become compatible with each other and no metal debris is generated. Further, the grease 82 deteriorates and the lubrication function is lowered, and the grease 82 gradually dissolves in the mission oil 80 that has flowed into the internal space. When the grease 82 is completely dissolved in the mission oil 80, the gap between the outer ring 41 and the ball 70 and the gap between the ball 70 and the inner ring 50 are lubricated by the mission oil 80. Thus, since the mission oil 80 with less metal scrap is used for the lubrication between the outer ring 41 and the ball 70, and between the ball 70 and the inner ring 50, the abnormal wear of the ball bearing 10 can be prevented. . That is, abnormal wear of the outer ring side raceway surface 42, the inner ring side raceway surface 52, and the balls 70 can be prevented.

  While the mission oil 80 is not present in the internal space surrounded by the outer ring 41, the inner ring 50, and the seal member 71, the labyrinth between the seal members 71, 78 and the inner ring 50 is caused by the flow of air that rotates around the inner ring 50. The seal 78 has a labyrinth seal function and prevents dust and the like from entering the internal space from the outside.

  If the mission oil 80 exists in the internal space surrounded by the outer ring 41, the inner ring 50 and the seal member 71, the mission oil 80 flows out from the labyrinth seal 78 between the seal members 71, 78 and the inner ring 50, and the labyrinth seal 78. Does not have a labyrinth seal function.

  The mission oil 80 is periodically changed according to the traveling km of the automobile or the elapsed time of use. However, the grease 82 in the ball bearing 10 cannot be changed unless the transmission 10 and the ball bearing 10 are disassembled. . Thus, it is desirable to use the mission oil 80 instead of the grease 82 to lubricate the ball bearing 10 when the elapsed time of use of the transmission has passed to some extent.

  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.

  The embodiment mentioned above gave the example which applied the ball bearing as a rolling bearing. As another embodiment, a cylindrical roller bearing can also be applied as a rolling bearing.

41: outer ring, 50: inner ring, 70: ball (rolling element), 71: seal member, 72: seal body, 73: catch part, 74: magnet, 75: inlet, 78: labyrinth seal, 80: mission oil ( Oil), 82: Grease

Claims (1)

An outer ring, an inner ring disposed on the inner peripheral side of the outer ring, a rolling element that is disposed between the outer ring and the inner ring and rolls against them, and a seal member that seals between the outer ring and the inner ring, In the rolling bearing with seal in which the seal member forms a labyrinth seal between rotating wheels among the outer ring and the inner ring,
A catch portion for catching and storing the scattered oil is provided on the side surface of the seal member opposite to the rolling element, a magnet is provided in the catch portion, and the oil in the catch portion is supplied to the outer ring, the seal member. A rolling bearing with a seal, characterized in that an introduction port leading to an inner ring and an internal space surrounded by the seal member is provided.

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