JP2019173920A - Rolling bearing - Google Patents

Abstract

To smoothly discharge foreign matters accumulated between a seal and a slinger to the outside of a bearing space during the rotation or the resting of an inner ring, and to further improve sealing performance without increasing agitation resistance in air and a mass.SOLUTION: A rolling bearing comprises: an outer ring 2 and an inner ring 3; rolling bodies 4 arranged between the rings; a seal 20 fixed to the outer ring 2, and slide-contacting with the inner ring 3 at its inside-diameter side end part: and a slinger 10 fixed to the inner ring 3 at the outside of the bearing of the seal 20, rotating together with the inner ring 3. An end face 13 of the slinger 10 at the inside of the bearing is formed into a flat face, and one or plurality of grooves 14 are formed at the end face 13 toward a radial direction. The grooves 14 are inclined to a direction reverse to a rotation direction of the inner ring 3 toward the outside-diameter side from the inside-diameter side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rolling bearing provided with a sealing device that is used in, for example, equipment in which water, dust, or the like intervenes, and prevents such water or dust from entering the bearing space.

  In rolling bearings used in various applications, an outer ring and an inner ring are sealed with an annular seal to prevent water, dust, etc. (hereinafter collectively referred to as “foreign matter”) from entering the bearing space. What covers between the two is common. For example, there is one in which the outer peripheral side of the seal is fixed to the outer ring and a lip is provided on the inner peripheral side of the seal so as to be in sliding contact with the inner ring.

  However, in particular, in a rolling bearing used at high speed, the lip slides against the inner ring with a small contact pressure, so-called light contact, in order to prevent heat generation of the lip of the seal slidingly contacting the inner ring. For this reason, it is difficult to prevent foreign matter from entering the bearing space only with the seal. In addition, for example, in a mechanical device that easily enters water into a rolling bearing such as a dehydrator or a mechanical device that easily generates dust such as a woodworking machine, the water or dust enters the bearing space. It is necessary to prevent this more reliably. Therefore, there is a rolling bearing sealing device in which a shielding plate called a slinger is provided on the outer side of the seal so as to face the seal so that foreign matter does not directly hit the seal. Examples of this type of rolling bearing with a sealing device include those described in Patent Documents 1 to 3.

  For example, Patent Document 1 includes a seal that is fixed to an outer ring and rotates with the outer ring, and a slinger that is fixed to the inner ring on the bearing outer side of the seal, and is formed between the seal and the slinger. A rolling bearing is described that includes a sealing device in which a gap is opened to the outside of the bearing on the outer diameter side of the slinger to form a labyrinth. It is described that a protrusion is formed on the inner side of the bearing of the slinger, and that the protrusion is formed continuously along the radial direction of the slinger. The protrusion is made of an elastic body fixed to the slinger, and is characterized by being in sliding contact with the side surface of the seal on the outer side of the bearing.

  Further, for example, Patent Document 2 includes a seal that is also fixed to the outer ring and rotates together with the outer ring, and a slinger that is fixed to the inner ring on the bearing outer side of the seal, and is formed between the seal and the slinger. A labyrinth is formed by closing the gap between the outer diameter of the slinger and the outside of the bearing. A side surface on the bearing outer side of the seal is a flat surface, and radial protrusions are formed on the flat surface so as to be inclined with respect to the radial direction. The inclination direction of the radial protrusion is a direction in which foreign matter that has entered between the seal and the slinger with respect to the rotation of the seal is discharged to the outside in the radial direction of the bearing.

  Further, for example, Patent Document 3 includes a seal that is also fixed to the outer ring and rotates together with the outer ring, and a slinger that is fixed to the inner ring on the bearing outer side of the seal, and the slinger is radially outward. The end has a gap between the inner ring surface of the outer ring, and the radially outer end of the outer ring has a shape parallel to the axial direction from the bearing inner side toward the bearing outer side along the inner ring surface of the outer ring. Or it is set as the inclination state which diameter-expands. Grooves or protrusions that are inclined with respect to the axial direction are continuously formed on the outer peripheral surface facing the outer ring at the radially outer end of the slinger, and the inclination direction of the grooves or protrusions depends on the rotation of the slinger. On the other hand, the foreign matter interposed between the inner surface of the outer ring and the radially outer end of the slinger is guided in the direction from the bearing inner side to the bearing outer side.

JP 2013-204755 A JP 2009-197969 A JP 2009-204058 A

  By the way, in a rolling bearing with a sealing device provided with a slinger, there is a problem that foreign matter that has entered the gap between the slinger and the seal is difficult to be discharged to the outside and easily stays in the gap. The foreign matter staying in the gap between the slinger and the seal approaches the sliding contact portion of the lip provided in the seal, and as a result, the foreign matter may enter the bearing space. Therefore, in a rolling bearing with a sealing device provided with this kind of slinger, it is a problem to reduce the foreign matter that has entered between the slinger and the seal effectively and stay.

  In this regard, Patent Document 1 assumes only the outer ring rotation specification. Patent Document 1 is a mechanism for blocking foreign matter moving along with the air flow in the direction of rotation of the outer ring by the air flow generated following the seal rotating together with the outer ring by the projection of the slinger and discharging it to the outer diameter side of the slinger. is there. However, if this mechanism is diverted to the inner ring rotation specification, the projection of the slinger that rotates together with the inner ring directly agitates the air in which the foreign matter stays. For this reason, the stirring resistance due to the rotation of the protrusion is generated during the rotation of the bearing, which may lead to an increase in torque. Therefore, it is difficult to divert the configuration of Patent Document 1 to the inner ring rotation specification.

  Patent Document 2 also assumes only an outer ring rotation specification. Since Patent Document 2 is provided with a protrusion on a flat surface on the bearing outer side of the seal that rotates together with the outer ring, in the same manner as Patent Document 1, in order to stir the air in which foreign matter stays, There is concern about the generation of the stirring resistance. If this mechanism is diverted to the inner ring rotation specification, the foreign matter that moves along with the air flow in the direction of rotation of the inner ring is blocked by the seal protrusion by the air flow that follows the slinger that rotates with the inner ring. Can be expected to be discharged to the outside in the radial direction of the seal. However, since there is a lip in sliding contact with the inner ring at the inner diameter side end of the seal, the area where the protrusion is provided is limited. For this reason, it is difficult to catch foreign matter adhering to the outer diameter surface of the inner ring while the bearing is stationary and to smoothly discharge the foreign matter.

  Further, in Patent Documents 1 and 2, since the protrusion is provided on the flat surface of the slinger or the seal, if the protrusion comes into contact with the seal end surface or the slinger end surface due to the displacement of the press-fit position of the slinger or the accuracy error, the rotational torque increases There is a possibility that it may lead to the generation of noise. In addition, in order to avoid the protrusion from coming into contact with the seal or slinger, a method of ensuring a wider gap between the seal and the slinger can be considered, but if the slinger press-fitting position is too far from the seal end surface, the slinger or seal The provided protrusion may not function effectively. Further, in order to secure a gap between the seal and the slinger necessary for the protrusion to function effectively, the bearing width dimension may increase. If the axial dimension of the bearing is increased, the mass of the bearing is increased, which affects the transportation of foreign matter by a seal provided with a protrusion or a slinger.

  Patent Document 3 assumes an inner ring rotation specification. However, Patent Document 3 discloses a mechanism for preventing foreign matter from entering during rotation of the bearing, but does not have a mechanism for smoothly discharging the foreign matter staying in the gap between the seal and the slinger. For this reason, there is a possibility that foreign matter staying in the gap between the seal and the slinger enters the bearing space while the inner ring (or shaft) is stationary.

  Therefore, the problem of the present invention is that the foreign matter staying between the seal and the slinger can be smoothly discharged to the outside of the bearing space while the inner ring (or shaft) is rotating or stationary, and in the air It is to make a rolling bearing with a sealing device with further improved sealing performance without causing an increase in stirring resistance and mass.

  In order to solve the above-described problems, the present invention provides an outer ring and an inner ring, a rolling element disposed between the outer ring and the inner ring, and an inner diameter side end portion that is fixed to the outer ring and is in sliding contact with the inner ring. A seal and a slinger fixed to the inner ring on the bearing outer side of the seal and rotating together with the inner ring, and an end surface on the bearing inner side of the slinger is a flat surface, and the end surface has a radial direction. A rolling bearing in which one or a plurality of grooves are formed toward is adopted.

  Here, the groove | channel can employ | adopt the structure which is a shape inclined in the direction opposite to the rotation direction of the said inner ring toward the outer diameter side from an inner diameter side.

  Moreover, the said groove | channel can employ | adopt the structure which faces the inner-diameter side edge and outer-diameter side edge of the said end surface. Alternatively, it is possible to adopt a configuration in which the groove faces only the outer diameter side edge of the end face and a configuration that faces only the inner diameter side edge of the end face. Furthermore, it is possible to employ a configuration in which the groove is closed before the inner diameter side edge and the outer diameter side edge of the end face.

  In each of these aspects, it is possible to adopt a configuration in which the bottom surface of the groove has an arc shape along the width direction of the groove.

  Moreover, in each of these aspects, the structure by which the recessed part is formed in the part between the said slinger and the said seal | sticker in the outer-diameter surface of the said inner ring | wheel is employable.

  According to the present invention, a groove is formed on the bearing inner side end surface of the slinger that rotates together with the inner ring, so that the groove retains between the slinger and the seal or removes foreign matter adhering to the outer surface of the inner ring. It can be captured while rotating or stationary. For this reason, when the inner ring rotates, the foreign matter is easily guided and discharged to the outer diameter side of the slinger by the centrifugal force accompanying the rotation of the inner ring and the slinger.

  In this way, by forming a groove in the slinger, foreign matter staying between the seal and the slinger during rotation of the inner ring can be smoothly discharged to the outside of the bearing space. There is no increase in resistance or mass, and the sealing performance can be further improved.

A longitudinal sectional view showing an embodiment of the present invention Side view of the slinger in the first embodiment A perspective view of a slinger in the first embodiment Side view of the slinger in the second embodiment Side view of the slinger in the third embodiment Side view of the slinger in the fourth embodiment Side view of the slinger in the fifth embodiment Sectional drawing of the groove | channel of the slinger in 6th embodiment Sectional drawing of the sealing device in 7th embodiment

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of an embodiment of the present invention. Here, a deep groove ball bearing is employed as the rolling bearing 1, but the configuration of the present invention can also be applied to a rolling bearing 1 having a structure other than the deep groove ball bearing. For example, a cylindrical roller bearing, a tapered roller bearing, or a self-aligning roller bearing may be used.

  As shown in FIG. 1, the rolling bearing 1 includes an outer ring 2 and an inner ring 3 that are coaxially arranged, and a plurality of rolling elements 4 that are arranged in an annular space between the outer ring 2 and the inner ring 3. Yes. Here, the inner ring 3 is an annular member, and the shaft is inserted inside the annular member and integrated with the fixing means 5. However, the inner ring 3 itself may be configured with a shaft. Even when the inner ring 3 itself is constituted by a shaft, this shaft is also called the inner ring 3.

  An annular raceway surface (track groove) 2 a is formed along the circumferential direction on the inner diameter surface of the outer ring 2, and an annular raceway surface (track groove) 3 a along the circumferential direction is formed on the outer diameter surface of the inner ring 3. Is formed. The raceway surfaces 2a and 3a are opposed to each other in the radial direction, and a plurality of rolling elements 4 are incorporated between the raceway surfaces 2a and 3a along the circumferential direction. The rolling element 4 is held in the circumferential direction by an annular cage 6.

  Since the rolling bearing 1 of this embodiment is a deep groove ball bearing, a ball is adopted as the rolling element 4, and the raceway surfaces 2a and 3a are raceway grooves having an arcuate cross section. For example, when a roller bearing is employed as the rolling bearing 1, a roller is employed as the rolling element 4, and the cross-sectional shape of the raceway surfaces 2a and 3a is a shape corresponding to the peripheral surface of the roller.

  The annular space between the outer ring and the inner ring has openings on both the one side and the other side in the axial direction. Hereinafter, this annular space is referred to as a bearing space. Sealing devices are respectively provided at the openings on both axial sides of the bearing space. The sealing device includes a seal 20 that is fixed to the outer ring 2 and whose inner diameter side end is in sliding contact with the inner ring 2, and a slinger 10 that is fixed to the inner ring 3 on the bearing outer side of the seal 20 and rotates together with the inner ring 3. .

  The seal 20 includes a seal base portion 22 fixed to the inner diameter surface of the outer ring 2, a seal wall portion 21 extending from the seal base portion 22 toward the inner diameter side, and a lip 23 provided on the inner diameter side of the seal wall portion 21. The lip 23 is located on the innermost diameter side of the seal 20 and is in sliding contact with the outer diameter surface of the inner ring 3 while being elastically deformed. In this embodiment, the seal base 22 is fitted and fixed in a recess provided on the inner diameter surface of the outer ring 2, but the structure for fixing the seal 20 to the outer ring 2 is free, and there are various methods such as fitting, press-fitting, and the like. Can be adopted.

  The slinger 10 includes a base portion 12 fixed to the outer diameter surface of the inner ring 3 and a wall portion 11 extending from the base portion 12 to the outer diameter side. The end portion on the outer diameter side of the wall portion 11 faces the inner diameter surface of the outer ring 2 with a gap. In this embodiment, the base 12 is press-fitted and fixed to the outer diameter surface of the inner ring 3. However, the fixing structure of the slinger 10 to the inner ring 3 is free, and press-fitting, fitting, and other various methods can be employed.

  In this embodiment, the shapes of the base 12 and the wall 11 are L-shaped in cross section, but the shapes of the base 12 and the wall 11 can be freely set.

  However, the bearing inner end surface 13 of the slinger 10 has a flat flat surface. The end surface 13 having the flat surface is opposed to the side surface of the seal 20 on the axially inner side with a gap. Here, it is desirable that the entire end surface 13 of the slinger 10 is a flat flat surface, but at least a part of the radial range facing the side surface of the seal 20 needs to have a flat surface. . Further, it is desirable that the flat surface extends over the entire circumference along the circumferential direction of the bearing except for a groove 14 described later.

  On the end surface 13 of the slinger 10, one or more grooves 14 are formed in the radial direction. Seven examples from the first embodiment to the seventh embodiment will be given below according to the form of the groove 14 and the form of members around the slinger 10.

  A first embodiment is shown in FIGS. In the first embodiment, the grooves 14 formed on the end surface 13 of the slinger 10 have a plurality of (a plurality of) grooves, and all the grooves 14 are linear. Further, the center line direction of each groove 14 is a radial direction passing through the axis of the slinger 10.

  In the figure, reference numeral 14 a indicates the inner diameter side end of the groove 14, and reference numeral 14 b indicates the outer diameter side end of the groove 14. The inner diameter side end 14 a of the groove 14 faces (opens) the inner diameter side edge of the end surface 13 of the slinger 10, and the outer diameter side end 14 b of the groove 14 faces the outer diameter side edge of the end surface 13 of the slinger 10. Yes (open).

  By providing the groove 14 on the end surface 13 of the slinger 10, foreign matter staying between the slinger 10 and the seal 20 or adhering to the outer diameter surface of the inner ring 3 can be retained while the inner ring 3 is rotating or stationary. Regardless, it can be captured by the groove 14. The captured foreign matter is guided to the outer diameter side of the slinger 10 by the centrifugal force accompanying the rotation of the inner ring 3 and the slinger 10 when the inner ring 3 is rotated, and is smoothly discharged to the outside of the bearing space. Further, since it is sufficient to process the existing slinger 10 so as to form the groove 14, it is necessary to change the axial dimension as compared with the case where the seal 20 or the slinger 10 is provided with a projection as in the conventional case. In addition, the weight of the member can be reduced.

  Moreover, since the groove | channel 14 should just be formed with respect to the existing slinger 10, a process is easier than the case where a protrusion is formed like before. In addition, since there are no protrusions on the slinger 10, there is no concern about the stirring resistance of air in which foreign matter stays and the slinger 10 and the seal 20 are in contact with each other, and the foreign matter stayed between the slinger 10 and the seal 20 is smoothly removed. The slinger 10 can be discharged to the outer diameter side. Thereby, the heat_generation | fever and deterioration of a rotation condition by the penetration | invasion of a foreign material can be prevented, and the performance of the rolling bearing 1 can be maintained favorable. Such an effect can be similarly expected in the following embodiments.

  A second embodiment is shown in FIG. In the second embodiment, similarly, the grooves 14 formed on the end surface 13 of the slinger 10 have a plurality of strips (a plurality of grooves), and all the grooves 14 are linear. Further, the center line direction of each groove 14 is inclined from the inner diameter side toward the outer diameter side in a direction opposite to the rotational direction A of the inner ring 3 with respect to the radial direction passing through the axis of the slinger 10. . In the second embodiment, it is assumed that the outer ring 2 is a stationary race ring, and the rotation direction A of the inner race 3 that is the rotation race track is limited to one direction around the axis. When the rotation direction A of the groove 14 is not constant, the center line direction of each groove 14 can be determined by the rotation direction A on the side where the occurrence state is more frequent among the rotation directions in one direction or the other direction.

  In this embodiment, all the grooves 14 are linear, but the grooves 14 may be curved. For example, the shape of the groove 14 is gradually curved in a direction opposite to the rotation direction A of the inner ring 3 as it goes from the inner diameter side to the outer diameter side, and is inclined in a direction opposite to the rotation direction A of the inner ring 3 as a whole. You may make it become the shape which carried out.

  According to the groove 14 of the second embodiment, the foreign matter staying in the gap between the slinger 10 and the seal 20 is different from the rotational direction A of the inner ring 3 due to the centrifugal force accompanying the rotation of the inner ring 3 and the slinger 10. It becomes easy to move in the reverse direction. As a result, the foreign matter is likely to jump out in the direction opposite to the rotation direction A from the outer diameter side end 14b of the groove 14 toward the outer diameter side, and the jumped out foreign matter is difficult to scatter along the rotation direction A. Can be expected.

  A third embodiment is shown in FIG. In the third embodiment, the groove 14 formed on the end surface 13 of the slinger 10 has a plurality of strips (a plurality), and each groove 14 faces only the outer diameter side edge of the end surface 13 of the slinger 10. It is a thing. That is, the inner diameter side end 14a of the groove 14 is closed before the inner diameter side edge of the slinger 10, and the outer diameter side end 14b of the groove 14 faces the outer diameter side edge of the slinger 10 (opens). .

  Here, as the straight line shape of all the grooves 14, the center line direction of the grooves 14 is a radial direction passing through the axis of the slinger 10, but the center line direction of each groove 14 is from the inner diameter side to the outer diameter side. The shape may be inclined toward the direction opposite to the rotational direction A of the inner ring 3. Further, the direction in which the groove 14 extends may be curved as described above.

  A fourth embodiment is shown in FIG. In the fourth embodiment, each groove 14 faces only the inner diameter side edge of the end surface 13 of the slinger 10. That is, the inner diameter side end 14 a of the groove 14 faces (opens) the inner diameter side edge of the slinger 10, and the outer diameter side end 14 b of the groove 14 is closed before the outer diameter side edge of the slinger 10. .

  A fifth embodiment is shown in FIG. In the fifth embodiment, each groove 14 is closed before the inner diameter side edge and the outer diameter side edge of the end surface 13 of the slinger 10. That is, the inner diameter side end 14 a of the groove 14 is closed before the inner diameter side edge of the slinger 10, and the outer diameter side end 14 b of the groove 14 is also closed before the outer diameter side edge of the slinger 10.

  As shown in the first to fifth embodiments, the groove 14 of the slinger 10 may penetrate from the inner diameter side edge to the outer diameter side edge of the end face 13, It may have a shape penetrating either one of the radial edges or not penetrating both. In any form of the groove 14, the foreign matter can be smoothly discharged to the outer diameter side of the slinger 10.

  A sixth embodiment is shown in FIG. In the sixth embodiment, the bottom surface of the groove 14 has an arc shape along the width direction of the groove 14. The shape of the bottom surface of the groove 14 is arbitrary. In addition to such an arc-shaped bottom surface, the groove 14 having a rectangular cross section having a flat bottom surface and side surfaces rising from both ends of the bottom surface in the width direction, or a V-shaped cross section. It may be a groove 14 or the like.

  As described above, the groove 14 may have various cross-sectional shapes. However, when the bottom of the groove 14 has an arc shape as shown in FIG. The frictional force when moving in 14 can be reduced. In particular, in the sixth embodiment, since the bottom of the groove 14 has a semicircular shape, it is possible to enhance both the effects of improving the foreign matter capturing ability and reducing the frictional force. Such a cross-sectional shape of the groove 14 can be applied in each embodiment.

  A seventh embodiment is shown in FIG. In the seventh embodiment, a recess 30 is provided in a portion between the slinger 10 and the seal 20 on the outer diameter surface of the inner ring 3. Thus, if the recessed part 30 is provided in the outer diameter surface of the inner ring | wheel 3, the foreign material adhering to the recessed part 30 of the outer diameter surface of the inner ring | wheel 3 will become easy to move to the slinger 10 side with a centrifugal force. This is because the foreign matter is present in a certain amount in the recess 30 and the effect of centrifugal force is easily obtained. For this reason, the effect that the groove 14 formed in the end surface 13 of the slinger 10 can easily catch foreign matters can be expected. Such a recess 30 provided on the outer diameter surface of the inner ring 3 can be applied in each embodiment.

  The cross-sectional shape of the recess 30 can be various shapes as in the case of the groove 14. For example, as shown in FIG. 9, the cross-sectional shape gradually decreases from the bottom 31 of the recess 30 toward the bottom of the slinger 10. It is good also as a form provided with the inclined surface 32 which goes to an outer-diameter side. Thus, if the recessed part 30 is made into the form provided with the inclined surface 32 which goes to an outer-diameter side gradually toward a bearing outer side, the foreign material adhering to the recessed part 30 will be induced | guided | derived to the slinger 10 side by centrifugal force. Cheap.

  In each of the above embodiments, the groove 14 formed on the end surface 13 of the slinger 10 is a plurality of (a plurality of) grooves. However, the groove 14 may be, for example, a single line (one). Further, the configuration of the groove 14 according to the third to fifth embodiments, that is, the setting of the position of the inner diameter side end 14a of the groove 14 and the setting of the position of the outer diameter side end 14b of the groove 14 are set to the second. The present invention may be applied to the inclined groove 14 in the embodiment.

  In each of the above embodiments, the outer ring 2 is the stationary side and the inner ring 3 is the rotating side. However, if the outer ring 2 is set at least as a race ring on which the inner ring 3 rotates, the outer ring 2 is connected to the housing or the like. It is not limited to those that are completely fixed.

DESCRIPTION OF SYMBOLS 1 Rolling bearing 2 Outer ring 2a Raceway surface 3 Inner ring 3a Raceway surface 4 Rolling body 5 Fixing means 6 Cage 10 Slinger 11 Wall part 12 Base part 13 End surface 14 Groove 14a Inner diameter side end 14b Outer diameter side end 20 Seal 21 Seal wall part 22 Seal Base 23 Lip 30 Recess 31 Bottom 32 Inclined surface

Claims (8)

An outer ring (2) and an inner ring (3);
A rolling element (4) disposed between the outer ring (2) and the inner ring (3);
A seal (20) fixed to the outer ring (2) and having an inner diameter side end in sliding contact with the inner ring (2);
A slinger (10) fixed to the inner ring (3) on the bearing outer side of the seal (20) and rotating together with the inner ring (3);
With
The end surface (13) on the inner side of the bearing of the slinger (10) is a flat surface, and the end surface (13) is formed with one or more grooves (14) in the radial direction. bearing.   The rolling bearing according to claim 1, wherein the groove (14) has a shape inclined in a direction opposite to a rotation direction of the inner ring (3) from the inner diameter side toward the outer diameter side.   The rolling bearing according to claim 1 or 2, wherein the groove (14) faces an inner diameter side edge and an outer diameter side edge of the end face (13).   The rolling bearing according to claim 1 or 2, wherein the groove (14) faces only the outer diameter side edge of the end face (13).   The rolling bearing according to claim 1 or 2, wherein the groove (14) faces only an inner diameter side edge of the end face (13).   The rolling bearing according to claim 1 or 2, wherein the groove (14) is closed before an inner diameter side edge and an outer diameter side edge of the end face (13).   The rolling bearing according to any one of claims 1 to 6, wherein a bottom surface of the groove (14) has an arc shape along a width direction of the groove (14).   The rolling bearing according to any one of claims 1 to 7, wherein a recess (30) is formed between the slinger (10) and the seal (20) on the outer diameter surface of the inner ring (3).

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