JP2016090020A - Rolling bearing with seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent clogging without roughening a filter which is arranged at a seal ring.SOLUTION: A filter 13 is formed of a plurality of filtration holes 14 penetrating a seal ring 6. A hole surrounding part 15 surrounding the filtration holes 14 out of a surface of the seal ring 6 at the outside of a bearing is formed into a three-dimensional shape which is protruded in a tapered shape toward the outside of the bearing. By this constitution, foreign matters hung at a tip edge of the hole surrounding part 15 are easily removed from sideways of inlets of the filtration holes 14. Furthermore, an external peripheral part 20 for inducing a flow for disturbing an approach of a lubricant to the inlets of the filtration holes 14, and a vane 30 for generating a vortex in the vicinity of the inlets of the filtration holes 14 are arranged at an annular member 10 which is attached to an inner ring 2 that is a rotating ring, and the foreign matters thereby hardly remain at the inlets of the filtration holes 14.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rolling bearing with a seal provided with a seal ring attached to a bearing ring.

  In the rolling bearing, a contact point between the rolling element and the inner and outer raceway surfaces exists in the bearing, which is a space between the inner and outer races. It is required to continuously supply lubricating oil inside the bearing. A seal ring is attached to the race ring in order to suppress the situation where the lubricant oil leaks to the outside of the bearing. Conventionally, oil bath lubrication has been used as a method of supplying lubricating oil into the bearing. In oil bath lubrication, foreign matters such as metal wear powder and peeling pieces can be mixed with the lubricating oil stored outside the bearing. As a bearing use environment in which such a situation may occur, for example, a bearing device in a hydraulic pump such as various construction machines can be cited.

  The rolling bearing with seal disclosed in Patent Document 1 is provided with a filter in the seal ring by forming an opening that is passed through the seal ring in the axial direction and fixing a filter member for filtration in the opening. Is. Lubricating oil stored outside the bearing is supplied into the bearing through the filter. At this time, the filter captures foreign matter. This kind of sealed rolling bearing can prevent the raceway surface and rolling surface from being damaged by foreign matter.

JP-A-6-323335

  The seal ring of Patent Document 1 employs a mesh-like filter member, but does not specifically disclose the mesh shape or mesh size.

  The inventor of the present application examined the form of the filter provided in the seal ring by experiment. In a simple planar mesh filter, the filter is clogged with foreign matter in the lubricating oil, and the lubricating oil is supplied into the bearing. It has been found that this leads to a decrease in bearing life and an increase in temperature. In addition, if the size of the eye is increased to roughen the filter in order to prevent clogging, the foreign matter catching performance is reduced, and foreign matter can easily enter the bearing, leading to a reduction in bearing life. I also understood that.

  Therefore, the problem to be solved by the present invention is to prevent clogging without roughening the filter provided in the seal ring.

  According to a first aspect of the present invention, the first race ring, the second race ring, the rolling elements interposed between the first race ring and the second race ring, and the first race ring are provided. A seal ring attached to the bearing ring, and a filter for filtering the lubricating oil supplied to the inside of the bearing, wherein the filter is a rolling bearing with a seal provided in the seal ring. , A plurality of filter holes that pass through the seal ring, and of the outer surface of the bearing formed in the seal ring, a hole peripheral portion surrounding the filter hole is directed toward the outside of the bearing. A projecting configuration is adopted.

  If the filter is formed by a plurality of filter holes passed through the seal ring as in the first invention, the vicinity of the filter hole inlet (that is, the filter eyes) is three-dimensionally formed by the surface of the seal ring on the bearing outer side. Can be formed. Here, if a three-dimensional shape with the hole surrounding the filter hole protruding toward the outside of the bearing is adopted, the foreign object is filtered when the foreign substance mixed with the lubricating oil cannot pass through the inlet of the filter hole. Without entering the hole, it is caught by the periphery of the hole and captured by the filter, and then flows to the outside of the bearing. Further, some foreign matters directed to the surface portion other than the peripheral portion of the hole of the seal ring may be flowed toward the filter hole by the lubricating oil flowing along the surface portion. This foreign matter cannot be directed to the inlet of the filtration hole by being obstructed by the hole peripheral portion protruding toward the outside of the bearing. Thus, the 1st invention can prevent clogging, without making a filter rough.

  Preferably, the hole peripheral portion protrudes in a tapered shape toward the outside of the bearing. If the hole periphery protrudes in a tapered shape toward the outside of the bearing, the trapped foreign matter is inclined by the taper shape, and it is easier to come off to the side from the inlet of the filtration hole. It is difficult to stay in the state of closing the entrance. The tapered shape may be any shape such as a cone, a triangular cone, a square cone, or the like, in which foreign matter does not easily stay, but a tapered shape is more preferable in order to make it easier to come off from the inlet of the filtration hole.

  Moreover, it is also preferable that the inside of the filtration hole has a tapered shape that becomes wider from the bearing outer side toward the inner side. When such a filtering hole is used, the foreign matter that has passed through the inlet is less likely to be clogged in the hole.

  According to a second aspect of the present invention, the first race ring, the second race ring rotating with respect to the first race ring, the first race ring and the second race ring are provided. A rolling element interposed therebetween, a seal ring attached to the first raceway ring, and a filter for filtering lubricating oil supplied to the inside of the bearing, wherein the second raceway ring comprises an inner ring. The filter further includes an annular member that is attached to the second bearing ring and forms a labyrinth seal with the seal ring in a sealed rolling bearing provided in the seal ring, A configuration is adopted in which the annular member has an outer peripheral portion protruding toward the outside of the bearing so as to cause a flow that obstructs the approach of the lubricating oil to the filter with the rotation.

  According to the second invention, the annular member attached to the second race ring (that is, the inner ring) forms a labyrinth seal with the seal ring attached to the first race ring. Located nearby. Therefore, as the second race ring rotates with respect to the first race ring, the annular member attached to the second race ring rotates near the seal ring. When the lubricating oil comes into contact with the rotating annular member, it receives a feeding action by centrifugal force near the seal ring. If the annular member has an outer peripheral portion protruding toward the outside of the bearing, it is possible to direct the lubricating oil sent by the centrifugal force away from the seal ring. If the flow of the lubricating oil interferes with the filter in such a flow, the foreign matter mixed in the lubricating oil is hardly pushed into the eyes of the filter. Therefore, the second invention can prevent clogging without making the filter rough.

  According to a third aspect of the present invention, the first race ring, the second race ring rotating with respect to the first race ring, the first race ring and the second race ring are provided. A rolling element interposed therebetween, a seal ring attached to the first raceway ring, and a filter for filtering lubricating oil supplied to the inside of the bearing, and the filter is provided in the seal ring. In the above-mentioned sealed rolling bearing, an annular member that is attached to the second bearing ring and forms a labyrinth seal with the seal ring is further provided, and the annular member is formed on the second bearing ring. A configuration is adopted in which a blade portion that causes the vortex of the lubricating oil to come into contact with the filter on the outer side of the bearing with rotation is employed.

  According to the third invention, the annular member attached to the second race ring is disposed near the seal ring to form a labyrinth seal with the seal ring attached to the first race ring. The Therefore, as the second race ring rotates with respect to the first race ring, the annular member attached to the second race ring rotates near the seal ring. If the wing portion is formed on the annular member, the lubricating oil can be stirred in the vicinity of the filter outside the bearing with the rotation of the wing portion, thereby causing the vortex of the lubricating oil in contact with the filter. This vortex has the effect of allowing foreign matter to flow from the eyes of the filter. For this reason, the third invention can prevent clogging without roughening the filter.

  According to a fourth aspect of the invention for achieving the above object, the first raceway, the second raceway, the rolling elements interposed between the first raceway and the second raceway, and the first raceway A seal ring attached to the bearing ring, and a filter for filtering the lubricating oil supplied to the inside of the bearing, wherein the filter is a rolling bearing with a seal provided in the seal ring. The structure formed only in the half circumference region of the seal ring is adopted.

  According to the fourth aspect of the present invention, when oil-sealed lubrication is performed in such a manner that the rolling bearing with seal is immersed in the oil bath, the bearing can be installed with the semicircular region of the seal ring without a filter as the lower side. Generally, when lubricating oil is stored in an external oil bath, foreign matter stays below the oil bath. Therefore, if the half-circumference region without the filter is set to the lower side as described above, lubricating oil with relatively little foreign matter can be supplied into the bearing via the filter positioned on the upper side of the seal ring. For this reason, the 4th invention can prevent clogging of a filter, without enlarging the size of a filter eye.

  As described above, the first to fourth inventions can prevent clogging by employing the respective configurations without roughening the filter provided in the seal ring.

Sectional drawing which shows the principal part of 1st Embodiment of the invention which concerns on this application The partial side view which shows the filtration hole vicinity in the bearing outer side surface of the seal ring which concerns on 1st Embodiment The expanded sectional view near the filtration hole concerning a 1st embodiment The side view which shows the filter hole arrangement | positioning in the seal ring which concerns on 1st Embodiment from the bearing outer side Graph of test results showing the relationship between bearing life and indentation size Graph of test results showing the relationship between the size of the indentation and the size of the filtration hole Sectional drawing which shows the principal part of 2nd Embodiment of the invention which concerns on this application Sectional drawing which shows the principal part of 3rd Embodiment of the invention which concerns on this application The side view which shows the wing | blade part arrangement | positioning in the annular member which concerns on 3rd Embodiment from the bearing outer side Sectional drawing which shows the principal part of 4th Embodiment of the invention which concerns on this application

  1st Embodiment of the invention which concerns on this application is described based on an accompanying drawing. 1st Embodiment is an example of the rolling bearing with a seal | sticker which employ | adopted the above-mentioned 1st invention and 4th invention. As shown in FIG. 1, the first embodiment includes a first track ring 1, a second track ring 2, and rolling elements 3 interposed between the first track ring 1 and the second track ring 2. It has.

  The first bearing ring 1 is an outer ring having a raceway surface 4 formed on the inner periphery. The second bearing ring 2 is an inner ring having a raceway surface 5 formed on the outer periphery. The illustrated example shows single-row tapered roller bearings as race rings 1 and 2 and rolling elements 3, but the invention according to the present application is not limited to this, and ball bearings, cylindrical roller bearings, and double-row bearings. The present invention can also be applied.

  In the first embodiment, the first track ring 1 is a stationary ring supported by a housing (not shown). The second race ring 2 is attached to a rotary shaft (not shown) and is a rotary ring that rotates with respect to the first race ring 1. A predetermined number of rolling elements 3 of 3 or more revolve between the raceway surfaces 4 and 5. Of the space formed between the two race rings 1 and 2 in a state where the both race rings 1 and 2 are arranged concentrically, the space obtained through the rolling elements 3 is inside the bearing. Lubricating oil is supplied inside the bearing to lubricate the contact surface between the rolling element 3 and the races 1 and 2. The space outside the space sandwiched between the race rings 1 and 2 in the radial direction is the outside of the bearing. Here, the axial direction refers to the direction along the central axis of the two race rings 1 and 2 arranged concentrically, and the radial direction refers to the direction perpendicular to the central axis.

  The first embodiment further includes a seal ring 6 attached to the first race ring 1. The seal ring 6 is a contact seal that divides the inside of the bearing, which is a space formed between the race rings 1 and 2, with respect to the outside of the bearing, and suppresses intrusion of foreign matter from the outside at the relative rotation portion of the race rings 1 and 2. It has become. The first race ring 1 has a fitting surface 7 formed in a cylindrical surface shape. The seal ring 6 has an outer peripheral portion 8 that is press-fitted into the fitting surface 7. The seal ring 6 is attached to the first race 1 by this press-fitting. The seal ring 6 uses a metal ring having an outer peripheral portion 8 as a core material. The seal ring 6 has an elastomeric lip portion 9 attached to the inner peripheral portion of the core material.

  The first embodiment further includes an annular member 10 that is attached to the second race ring 2 and forms a labyrinth seal with the seal ring 6. The annular member 10 is attached by press-fitting to the fitting surface 11 formed on the second race ring 2. The annular member 10 is formed with a seal surface that is in sliding contact with the lip portion 9 of the seal ring 6. The lip portion 9 may be brought into sliding contact directly with the raceway ring 2. The annular member 10 has a side plate portion 12 that rises from the sealing surface. The side plate portion 12 is located on the bearing outer side with respect to the lip portion 9 and forms a labyrinth seal with the seal ring 6. The labyrinth seal is a flow path that reduces foreign matter intrusion into the bearing from between the seal ring 6 and the side plate portion 12 and between the side plate portion 12 and the side surface portion 19 of the lip portion 9 by the labyrinth effect.

  The first embodiment further includes a filter 13 that filters lubricating oil supplied from the outside of the bearing to the inside of the bearing. The filter 13 is formed by a plurality of filtration holes 14 passed through the seal ring 6. As shown in FIG. 2 and FIG. 3, each filtration hole 14 passes through the radial intermediate portion of the seal ring 6 that is out of the outer peripheral portion 8 and the lip portion 9 in the axial direction. Of the surface on the bearing outer side formed in the seal ring 6, the hole peripheral portion 15 surrounding the filtration hole 14 projects in a tapered shape toward the outside of the bearing. The hole surrounding portion 15 is formed for each filtration hole 14 and includes a tip edge that defines an inlet of the filtration hole 14.

  The filter 13 is formed only within the half circumference region of the seal ring 6 as shown in FIG. Here, the half circumference means a half circumference around the axis C of the races 1 and 2. In the half-circumferential region, a hole array portion in which two or more filtration holes 14 are arranged on a straight line in the radial direction is present at regular intervals in the circumferential direction around the axis C. The filter holes 14 are not limited to the radial mesh structure as shown in the figure, and may be arranged in a mesh shape in which a predetermined number is arranged in the chord direction and a predetermined number is also arranged in a direction perpendicular to the chord direction. is there. The arrangement of the filter holes 14 is not necessarily limited to the half circumference area of the seal ring 6, and the entire circumference area is considered in consideration of the size and amount of foreign matter in the lubricating oil, the supply amount of the lubricating oil into the bearing, and the like. Etc. can also be arranged.

  1st Embodiment is a radial bearing which supports a horizontal axis | shaft, Comprising: An oil bath (illustration omitted) is arrange | positioned outside a bearing, and the at least lower half circumference area of the seal ring 6 is the lubricating oil stored in the oil bath. It is assumed that it will be used in a state where it sinks. In the figure, the oil level OL of the stored lubricating oil is drawn. A one-dot chain line in the left-right direction in the drawing passing through the axis C indicates a boundary position between the lower half circumference area and the upper half circumference area of the seal ring 6. A large amount of foreign matter stays in the vicinity of the lower half circumference of the seal ring 6 far from the oil level OL and does not stay much in the vicinity of the upper half circumference of the seal ring 6 near the oil level OL. In the first embodiment, the bearing is installed with the half circumference area of the seal ring 6 without the filter 13 as the lower half circumference area, and lubricating oil with a relatively small amount of foreign matter is supplied into the bearing via the filter located above the seal ring. Thus, clogging of the filter 13 can be prevented without making the filter 13 rough (that is, without increasing the minimum hole diameter at the inlet of each filter hole 14).

  Even if foreign matter is mixed in the lubricating oil in the vicinity of the oil level OL, foreign matter having a size that cannot pass through the inlet of the filtration hole 14 defined by the hole peripheral portion 15 as shown in FIGS. Without entering the hole 14, it is caught by the filter 13 by being caught by the tip edge of the hole surrounding portion 15 protruding toward the outside of the bearing, and then flows to the outside of the bearing. In addition, when a foreign object that has moved to the side from the inlet of the filter hole 14 is flowed toward the adjacent filter hole 14, or a foreign object that is directed to the surface portion other than the hole surrounding portion 15 is directed to any one of the filter holes 14. Even if it is flowed, the foreign matter is obstructed by the hole peripheral portion 15 protruding toward the outside of the bearing and cannot go to the inlet of the filtration hole 14, and escapes to the side of the hole peripheral portion 15. Or to the outside of the bearing. Therefore, the foreign matter can be prevented from clogging the filtering hole 14. As described above, in the first embodiment, the three-dimensionalization of the hole surrounding portion 15 makes it difficult for foreign matter to stay in a state of blocking the inlet of the filtration hole 14, so that clogging can be prevented without roughening the filter 13. it can.

  Further, since the hole peripheral portion 15 has a tapered projecting surface tapered toward the outside of the bearing, the foreign matter caught on the tip edge of the hole peripheral portion 15 is easily inclined by the taper shape, and the hole It becomes easy to come off to the side from the inlet of the filtration hole 14 along the peripheral part 15. For this reason, especially 1st Embodiment can make it difficult for a foreign material to stay in the state which block | closes the inlet_port | entrance of a filtration hole.

  The hole peripheral portion 15 in the figure shows a conical shape that defines the inlet of the filtration hole 14 by the tip edge, but the invention according to the present application is not limited to this, and a triangular pyramid shape, a quadrangular pyramid shape, etc. An appropriate three-dimensional shape can be obtained. Note that the conical axis does not need to be oriented in the axial direction, but in order to obtain the same retention prevention performance regardless of where the foreign matter is caught around the hole, it should be set as close to the axial direction as possible. Is preferred.

  In order to effectively prevent foreign matter from staying at the inlet of the filtration hole 14, the opening angle θ shown in FIG. 3 is preferably set within a range of 60 ° to 120 °. The opening angle θ is a tapered opening angle in the hole surrounding portion 15. More specifically, in the cutting plane including the geometric center line of the hole surrounding portion 15 set in the axial direction, the angle formed by the upper bus bar of the hole surrounding portion 15 with respect to the center line, and the lower bus bar The total value of the angle formed with respect to the center line corresponds to the opening angle θ. If the opening angle θ is smaller than 60 °, the manufacturing is difficult and the shape becomes dangerous. For example, when manufacturing the hole surrounding part 15 by the press work with respect to a metal plate, 60 degrees-120 degrees are preferable from the manufacture surface of metal mold | die manufacture or press work itself. Further, in the case of a pressed product of a metal plate, there is a possibility that the plate edge may be injured during handling at an angle smaller than 60 °. Furthermore, at an angle smaller than 60 °, there is a possibility that the leading edge is deformed during handling or transport. On the other hand, when the opening angle θ is larger than 120 °, it is difficult for the foreign matter to easily come off the tip edge of the hole surrounding portion 15, and the possibility that the foreign matter stays in the filter portion increases.

  The foreign matter passage prevention performance itself by the filtering hole 14 is determined by the minimum hole diameter. As shown in FIG. 2 and FIG. 3, the hole shape of the filtration hole 14 is set to a substantially round hole, and the minimum hole diameter d1 of the filtration hole 14 is set as the hole diameter of the inlet defined by the tip edge of the hole peripheral portion 15. Has been. If the minimum hole diameter d1 of the filter hole 14 is too large, a large foreign matter passes through the filter hole 14 and reaches the inside of the bearing, so that a large indentation that affects the life of the bearing is formed on the raceway surfaces 4 and 5. On the other hand, if the minimum hole diameter d1 of the filter hole 14 is too small, the filter hole 14 may be clogged with foreign substances, and the lubricating oil may not be supplied into the bearing.

Therefore, the inventor of the present application conducted a life test under the following conditions (1) to (5) to find out the relationship between the size of the indentation, the minimum hole diameter of the filtration hole, and the bearing life.
(1) Test bearing type: Tapered roller bearing (2) Bearing main dimensions (bearing inner diameter, bearing outer diameter, bearing width): φ30 mm × φ62 mm × 17.25 mm
(3) Radial load: 17.65kN
(4) Axial load: 1.47kN
(5) Shaft rotational speed: 2000 min ^-1
FIG. 5 is a graph in which the horizontal axis represents the size of the indentation, and the vertical axis represents the ratio (life ratio) when the bearing life without the indentation is 1. FIG. 6 is a graph in which the minimum pore diameter of the filtration hole is taken on the horizontal axis, and the size of the indentation is taken on the vertical axis. From FIG. 5, it was found that when the size of the indentation exceeds 1 mm, the bearing life decreases rapidly, and the life ratio is less than 1.0 at about 1.2 mm to 1.3 mm. On the other hand, from FIG. 6, it was also found that the size of the minimum hole diameter of the filtration hole where the size of the indentation is 1.3 mm is about 0.7 mm. Therefore, if the size of the minimum hole diameter of the filtration hole is 0.7 mm or less, it is considered that the bearing life ratio of 1.0 can be secured and the bearing life can be prevented from decreasing.

  In an actual product, a dimensional error in manufacturing must be allowed when the filter hole 14 as shown in FIGS. 2 and 3 is formed. This dimensional error has no manufacturing difficulty if it is expected to be ± 0.2 mm. When the minimum hole diameter d1 is aimed at 0.5 mm, the minimum hole diameter d1 of each filter hole 14 of the filter 13 is within the range of 0.3 mm to 0.7 mm without any manufacturing difficulty. Thereby, the minimum hole diameter d1 can be increased as much as possible while preventing foreign matters exceeding 0.7 mm from passing through the filtration hole 14. Therefore, it is preferable that the minimum hole diameter d1 of the filtration hole 14 is a value within the range of 0.3 to 0.7 mm.

  On the other hand, at the outlet of the filter hole 14 through which the lubricating oil flows out into the bearing, it is preferable that the flow passage cross-sectional area be larger than the inlet. If it is this relationship, since the resistance which flows out from the filtration hole 14 will decrease, even if it will pass the filtration hole 14 and a foreign material penetrate | invades in the inside of a bearing, possibility that a foreign material will retain in the filtration hole 14 will become low. For example, as shown in FIG. 3, the filter hole 14 has a hole shape in which the outlet hole diameter d2> the inlet hole diameter (minimum hole diameter d1) and the hole diameter closer to the outlet is larger than the hole diameter closer to the inlet. Can be.

  In particular, the inside of the filter hole 14 is preferably tapered so as to increase from the bearing outer side toward the inner side. In other words, when the filter hole 14 whose diameter gradually increases from the inlet hole diameter d1 to the outlet hole diameter d2 is adopted, the foreign matter that has passed through the inlet becomes difficult to clog in the filter hole 14.

  The amount of protrusion in the axial direction of the hole peripheral portion 15 is a value exceeding 0.7 mm in order to completely deviate 0.7 mm of foreign matter that adversely affects the bearing life as described above from the inlet of the filter hole 14. It is preferable to make it.

  A second embodiment of the invention according to the present application will be described with reference to FIG. The second embodiment further adopts the above-described second invention in the first embodiment. Hereinafter, only differences from the first embodiment will be described, and the same names and reference numerals are used for corresponding components. FIG. 7 illustrates oil bath lubrication in a state where the entire rolling bearing with seal is submerged in the lubricating oil. For this reason, the filter hole 14 existing in the upper half circumference area of the seal ring 6 is also immersed in the lubricating oil stored outside the bearing.

  The annular member 10 of the second embodiment has an outer peripheral portion 20 that protrudes from the side plate portion 12 toward the outside of the bearing. The outer peripheral portion 20 extends over the entire circumference of the annular member 10 at a position aligned with the filtration hole 14 in the radial direction, and protrudes toward a virtual region extending from the inlet of the filtration hole 14 in the axial direction. Therefore, the overall three-dimensional shape of the outer peripheral portion 20 is a conical shape that tapers toward the inside of the bearing. As the flow of the lubricating oil is conceptually indicated by an arrow in FIG. 7, the lubricating oil is generated as the second race 2 (inner ring) rotates with respect to the first race 1 (outer ring). Are in contact with the side plate 12 of the annular member 10 rotating integrally with the second race 2 and the surface of the outer peripheral portion 20 on the bearing outer side, and receive a feeding action by centrifugal force. As a result, the lubricating oil is urged toward the filtration hole 14, and particularly, the lubricating oil in contact with the side plate portion 12 strikes the outer peripheral portion 20 on the outside of the bearing and changes its direction, away from the seal ring 6, and the filtration hole 14. It becomes a flow that obstructs the lubricating oil (arrow line in the left-right direction in the figure) that goes straight to the inlet extension of the filter hole and goes straight to the inlet of the filter hole 14. As described above, the outer peripheral portion 20 causes a flow that obstructs the approach of the lubricating oil to the inlet of the filter hole 14 (that is, the filter eyes), so that the foreign matter mixed in the lubricating oil is not easily pushed into the inlet of the filter hole 14. Become. Therefore, the second embodiment can prevent clogging without roughening the filter. Further, the second embodiment in which the outer peripheral portion 20 is used in combination can prevent clogging more than the first embodiment.

  A third embodiment of the invention according to the present application will be described with reference to FIGS. In the third embodiment, the above-described third invention is further adopted in the first embodiment. Hereinafter, only differences from the first embodiment will be described, and the same names and reference numerals are used for corresponding components. 8 and 9 also illustrate oil bath lubrication in a state where the entire rolling bearing with seal is immersed in the lubricating oil.

  The annular member 10 of the third embodiment has a wing part 30 protruding in the radial direction from the side plate part 12. Two or more wing parts 30 are arranged at equal intervals in the circumferential direction. Along with the rotation of the second ring 2, a large number of wings 30 of the annular member 10 that rotates integrally with the ring 2 agitate the lubricating oil in the rotation direction near the filter 13 outside the bearing. The vortex of the lubricating oil in contact with the vortex (the state of the vortex indicated by the arrow in FIG. 9 is shown). This vortex has the effect of flowing foreign matter from the eyes of the filter 13. For this reason, the third embodiment can prevent clogging without making the filter 13 rough. In addition, the third embodiment in which the wing portion 30 is used in combination can prevent clogging more than the first embodiment.

  In addition, the wing | blade part 30 makes the shape of the both wing | blade surfaces which faced the axial direction the shape along radial direction. Since both of these blade surfaces are flush with both side surfaces of the side plate portion 12, it can be formed by a simple process of radially cutting out the annular plate-shaped material portion from the outer peripheral side. When it is desired to generate a stronger vortex of the lubricating oil, the plate edge on the front side in the rotational direction of the wing portion 30 may be bent in the axial direction to improve the stirring property.

  A fourth embodiment of the invention according to the present application will be described with reference to FIG. In the fourth embodiment, only the shape of the hole periphery is changed in the first embodiment. That is, the filter 40 of the fourth embodiment has a hole surrounding portion 42 surrounding the filtration hole 41 protruding in a cylindrical shape. Thus, even with the hole peripheral portion 42 protruding in a non-tapered form, foreign matters having a size that cannot pass through the inlet of the filter hole 41 are caught by the hole peripheral portion 42 and do not enter the filter hole 41 and enter the filter 40. Then, it is flowed to the outside of the bearing. Further, even if foreign matter directed to the surface portion other than the hole peripheral portion 42 of the seal ring 6 flows toward the filter hole 41 along the surface portion, the hole peripheral portion 42 protruding toward the outside of the bearing. It is not possible to go to the inlet of the filter hole 41 due to the obstacle. Thus, according to the fourth embodiment, clogging can be prevented without roughening the filter.

  The technical scope of the present invention is not limited to the above-described embodiments, and includes all modifications within the scope of the technical idea based on the description of the scope of claims. Only one of the first to fourth inventions described above may be employed, or two or more may be employed in combination as appropriate, or all four may be employed.

1 First race (outer ring)
2 Second race (inner ring)
DESCRIPTION OF SYMBOLS 3 Rolling body 6 Seal ring 10 Annular member 12 Side plate part 13, 40 Filter 14, 41 Filter hole 15, 42 Hole surrounding part 19 Side face part 20 Outer part 30 Wing part

Claims (7)

A first race ring, a second race ring, a rolling element interposed between the first race ring and the second race ring, a seal ring attached to the first race ring, and a bearing A filter for filtering lubricating oil supplied to the inside, and the filter is a rolling bearing with a seal provided in the seal ring,
The filter is formed by a plurality of filter holes passed through the seal ring;
A rolling bearing with a seal, wherein a hole peripheral portion surrounding the filtration hole of the surface on the bearing outer side formed in the seal ring protrudes toward the outside of the bearing.   The rolling bearing with seal according to claim 1, wherein the hole peripheral portion projects in a tapered shape toward the outside of the bearing.   The rolling bearing with seal according to claim 1 or 2, wherein a minimum hole diameter of the filtration hole is a value within a range of 0.3 to 0.7 mm.   The rolling bearing with seal according to any one of claims 1 to 3, wherein the inside of the filtering hole has a tapered shape that becomes wider from the bearing outer side toward the inner side. A first race ring, a second race ring rotating with respect to the first race ring, a rolling element interposed between the first race ring and the second race ring, and the first race ring A seal ring attached to the bearing ring, and a filter for filtering the lubricating oil supplied to the inside of the bearing, wherein the second race ring is an inner ring, and the filter is provided on the seal ring. Rolling bearings with seals
An annular member attached to the second race ring and forming a labyrinth seal with the seal ring;
A rolling bearing with a seal, wherein the annular member has an outer peripheral portion protruding toward the outside of the bearing so as to cause a flow that obstructs the approach of the lubricating oil to the filter with the rotation. . A first race ring, a second race ring rotating with respect to the first race ring, a rolling element interposed between the first race ring and the second race ring, and the first race ring A seal ring attached to the bearing ring, and a filter that filters lubricating oil supplied to the inside of the bearing, wherein the filter is a rolling bearing with seal provided in the seal ring,
An annular member attached to the second race ring and forming a labyrinth seal with the seal ring;
A rolling bearing with a seal, wherein the annular member has a blade portion that causes a vortex of the lubricating oil in contact with the filter on the outside of the bearing as the second race is rotated. A first race ring, a second race ring, a rolling element interposed between the first race ring and the second race ring, a seal ring attached to the first race ring, and a bearing A filter for filtering lubricating oil supplied to the inside, and the filter is a rolling bearing with a seal provided in the seal ring,
A rolling bearing with a seal, wherein the filter is formed only within a half circumference region of the seal ring.

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