JP5595692B2 - Sealed rolling bearing - Google Patents

Description

  The present invention relates to a sealed type rolling bearing that is required to have water resistance and grease leakage resistance, such as an automobile auxiliary machine.

  Grease leakage from the bearing occurs when air flows outside the seal due to an increase in the internal pressure of the bearing space as the bearing temperature rises. For this reason, in a conventional sealed ball bearing, a method of providing a slit in the inner lip portion of the seal, that is, the main lip portion is used as a countermeasure against grease leakage (Patent Document 1).

Japanese Unexamined Patent Publication No. 2000-179560, FIG. 1 (B)

In the prior art, since the main lip portion of the seal has a slit, the water resistance is poor. If foreign matter such as water enters the bearing, the life of the bearing will be reduced.
Water resistance can be improved by eliminating the slit in the main lip, but in this case, grease leakage is likely to occur due to an increase in the internal pressure of the bearing space accompanying an increase in the temperature of the bearing. Since grease leakage adversely affects the bearing life and peripheral equipment, it is necessary to take measures against both grease leakage resistance and water resistance.
In particular, bearings used in automobile accessories are required to have water resistance due to the mounting condition, and because they are used at high speeds and the temperature of the bearing tends to rise, grease leakage resistance is required. Countermeasures for both grease leakage resistance and water resistance are essential.

  An object of the present invention is to provide a sealed rolling bearing capable of preventing an increase in internal pressure of a bearing space accompanying a rise in temperature of the bearing, preventing grease leakage and improving water resistance.

In the sealed type rolling bearing according to the present invention, a plurality of rolling elements are interposed between the rolling surfaces of the inner ring and the outer ring, and the outer peripheral edge portion is fitted in annular seal mounting grooves respectively provided at both ends of the inner peripheral surface of the outer ring. in combined peripheral portion is fixed to the tight seal-type rolling bearing for an automobile accessory provided with a sliding contact seal member to the inner ring, the sealing member includes a constricted portion recessed inner and outer surface, than the constricted portion A grease lip provided on the outer diameter side portion which is also the base end side, and a main lip and an outer lip provided to protrude inward and outward in the axial direction on the inner diameter side which is the distal end side of the constricted portion, The grease lip has an inclined surface that is inclined radially outward as it goes outward in the axial direction, the tip end surface of the grease lip is a surface substantially parallel to the end surface of the inner ring, and the inner diameter surface of the grease lip is the inner ring surface A surface substantially parallel to the outer diameter surface, The outer peripheral edge of the serial seal members, Keru set the slit allows ventilation between the bearing space and the bearing outside between the inner and outer rings through the seal mounting groove.

  According to this configuration, since the slit that allows ventilation between the bearing space and the outside of the bearing is provided in the outer peripheral edge portion of the seal member via the seal mounting groove, the internal pressure of the bearing space increases as the temperature of the bearing increases. Then, the air in the bearing escapes from the slit and is discharged outside the bearing. In this case, since the air in the bearing is released as the internal pressure in the bearing space increases, the internal pressure does not increase suddenly and the grease inside the bearing is not discharged. Further, since the inner peripheral edge of the seal member is in sliding contact with the inner ring, the water resistance is also improved. Therefore, foreign matters such as water do not enter the bearing, and the life of the bearing can be improved. Therefore, it is possible to prevent grease leakage and improve water resistance. Further, it can be dealt with only by providing a slit in the seal member, and no additional work of the inner and outer rings is required, so that the manufacturing is simple.

  An annular seal groove is provided on the outer peripheral surface of the inner ring, a main lip that is in contact with the inner surface of the seal groove on the inner peripheral edge of the seal member, and a tip extending from the outer diameter position to the inner side in the axial direction from the main lip. A grease lip adjacent to the outer peripheral surface of the inner ring via a seal gap may be provided. Since the grease lip is located outside the main lip, it is not affected by the behavior of the main lip, and the seal gap can be maintained and the labyrinth seal effect can be maintained. Further, compared with a seal member without a grease lip, the grease staying on the outer peripheral surface of the inner ring can be smoothly flowed to the outer diameter side along the outer peripheral surface of the grease lip. In other words, it is possible to prevent the grease from staying on the outer peripheral surface of the inner ring.

The sealed rolling bearing is Ru are used in the automobile auxiliary equipment. This sealed type rolling bearing can prevent grease leakage and improve water resistance. Therefore, it is suitable for automobile auxiliary equipment that is required to have water resistance and is used at a high rotational speed and the temperature of the bearing tends to rise. Can do.

  An outer peripheral surface portion of an end located on the outer diameter side of the bottom of the seal groove is provided outside the seal groove in the axial direction of the inner ring, and an outer periphery of the outer peripheral surface portion of the end is provided on the inner peripheral edge of the seal member. An outer lip facing the surface may be provided. In this case, a contact seal portion or a labyrinth seal gap can be formed between the tip of the outer lip and the outer peripheral surface portion of the end portion. Therefore, water resistance can be further improved.

Has a cage for holding the rolling elements, the grease quantity enclosed in the bearing space between the inner and outer rings, at least 20% in the entire space volume ratio, the rolling elements and the cage of the previous SL bearing space revolve The enclosed volume is 80 % or less in terms of the volume ratio of the static space, which is the volume ratio to the static space, which is the space excluding the space to be used.
From the result of the grease leak test by the applicant, the grease leak was confirmed when the amount of grease filled exceeded 80% in the static space volume ratio. Further, when the relationship between the amount of grease filled and the temperature rise of the bearing is confirmed, the temperature rise is large when the amount of grease filled is 85% or more of the static space volume ratio. For this reason, the upper limit of the amount of grease filled is desirably 80%. In addition, when the relationship between the grease filling amount and the bearing life was tested, when the grease filling amount was less than 20% in the total space volume ratio, the bearing life was significantly reduced. For this reason, the upper limit of the amount of grease filled is desirably 20%.

The consistency of the grease sealed in the bearing space between the inner and outer rings is less than 389 . The “consistency” represents the hardness of grease and corresponds to the viscosity of oil. This “consistency” indicates the penetration depth when a metal cone is penetrated by its own weight at 25 ° C., and is expressed by a value obtained by multiplying 10 times.
The applicant examined the relationship between consistency and grease leakage. In this test, the consistency was changed by increasing the proportion of base oil in the grease. In this test, grease leakage was confirmed when the consistency of the grease was 389 or more. Accordingly, the upper limit value of the grease consistency is preferably 389.

You may provide the slit of the said sealing member in the circumferential direction multiple places of the said outer periphery part. In this case, the internal pressure of the bearing space is smoothly reduced from a plurality of slits in the circumferential direction. Therefore, it is possible to prevent the grease leakage by further suppressing the increase in the internal pressure of the bearing space.
The plurality of slits in the circumferential direction of the seal member may include slits provided on the outer diameter surface of the outer peripheral edge and slits provided on the inner wall surface in the axial direction of the outer peripheral edge. good. When the internal pressure in the bearing space increases, the air can be passed through the slits provided in the inner wall surface and the outer diameter surface in order.
You may provide the slit provided in the said outer-diameter surface, and the slit provided in the inner wall surface inside the said axial direction in the position shifted in the circumferential direction. By shifting the circumferential position of the slit in this way, it is possible to prevent water from entering from the outside of the bearing and to smoothly release the air in the bearing .
You may provide the communicating path which communicates over the slit provided in the said outer diameter surface, and the slit provided in the inner wall surface inside the said axial direction in the outer peripheral part of the said sealing member.

In the sealed type rolling bearing according to the present invention, a plurality of rolling elements are interposed between the rolling surfaces of the inner ring and the outer ring, and the outer peripheral edge portion is fitted in annular seal mounting grooves respectively provided at both ends of the inner peripheral surface of the outer ring. in combined peripheral portion is fixed to the tight seal-type rolling bearing for an automobile accessory provided with a sliding contact seal member to the inner ring, the sealing member includes a constricted portion recessed inner and outer surface, than the constricted portion A grease lip provided on the outer diameter side portion which is also the base end side, and a main lip and an outer lip provided to protrude inward and outward in the axial direction on the inner diameter side which is the distal end side of the constricted portion, The grease lip has an inclined surface that is inclined radially outward as it goes outward in the axial direction, the tip end surface of the grease lip is a surface substantially parallel to the end surface of the inner ring, and the inner diameter surface of the grease lip is the inner ring surface A surface substantially parallel to the outer diameter surface, The outer peripheral edge of the serial seal members, the slit allows ventilation between the bearing space and the bearing outside between the inner and outer rings through the seal attachment groove is provided, having a retainer for holding the rolling elements, The volume ratio of grease to be sealed in the bearing space between the inner and outer rings is 20% or more in the total space volume ratio, and the volume ratio with respect to the static space that is the space excluding the space in which the rolling elements and the cage revolve in the bearing space. The amount of sealed space is 80% or less in the static space volume ratio and the consistency of the grease sealed in the bearing space between the inner and outer rings is less than 389, so that the increase in the internal pressure of the bearing space due to the temperature rise of the bearing is suppressed. In addition to preventing leakage of grease, it is possible to improve water resistance.

(A) is sectional drawing of the sealing type rolling bearing which concerns on one Embodiment of this invention, (B) is an expanded sectional view of the inner ring seal groove vicinity of the bearing. It is an expanded sectional view of the sealing member of the sealed rolling bearing. It is a front view (III-III line end view of Drawing 2) of the seal member. It is a principal part expanded sectional view of the seal member. It is a principal part expanded sectional view showing the state ventilated sequentially through a slit at the time of the internal pressure rise of a bearing space. (A) is the front view which looked at the sealing member from the axial direction inner side, (B) is an enlarged view which shows the slit provided in the inner wall surface of the axial direction inside of an outer peripheral edge part, (C) is the outer diameter of an outer peripheral edge part It is an enlarged view which shows the slit provided in the surface. It is sectional drawing of the testing machine of a water-resistant effect confirmation test. It is a figure showing the test result of the water resistance effect confirmation test. It is a figure showing the test result of a grease leak-proof effect check test. It is a figure showing the test result of the relationship between the grease filling amount and grease leakage. It is a figure showing the test result of the relationship between the grease filling amount and the bearing life. It is a figure showing the test result of the relationship between the consistency of grease, and the amount of grease leakage. It is sectional drawing which provided the sealing type rolling bearing concerning one Embodiment of this invention in the idler pulley. It is sectional drawing which provided the sealing type rolling bearing concerning one Embodiment of this invention in the alternator.

An embodiment of the present invention will be described with reference to FIGS.
The sealed rolling bearing according to this embodiment is applied to a bearing that is required to have water resistance and grease leakage resistance, such as an auxiliary machine for an automobile. However, the sealed type rolling bearing is not limited to automobile use. As shown in FIG. 1, this sealed rolling bearing has a plurality of rolling elements 3 interposed between rolling surfaces 1 a and 2 a of an inner ring 1 and an outer ring 2, and a cage 4 that holds these rolling elements 3 is provided. The seal members 5 and 5 are provided on both sides. For example, the rolling element 3 is made of a ball, and in this case, the bearing is a deep groove ball bearing.

Grease is sealed in the bearing space 6 between the inner and outer rings 1 and 2. Grease having a consistency of grease of less than 389 is enclosed in the bearing space 6. The amount of grease enclosed in the bearing space 6 is 20% to 80% in terms of the static space volume ratio.
The cage 4 has a crown shape having pockets Pt for holding balls at a plurality of locations in the circumferential direction of the annular body 4a. The inner surface of each pocket Pt has a concave spherical curved surface shape along the outer surface of the ball. A portion between adjacent pockets Pt and Pt of the annular body 4a becomes a connecting portion.

The seal member 5 and the like will be described.
As shown in FIG. 2, the seal member 5 is composed of a rubber-like elastic body 7 and a cored bar 8 made of a steel plate or the like. As shown in FIGS. 1A and 2, annular seal mounting grooves 2b and 2b are respectively provided at both ends of the inner peripheral surface of the outer ring 2, and a pair of seal members are provided in the seal mounting grooves 2b and 2b. 5, 5 outer peripheral edge portions 9 are fitted and fixed. As shown in FIGS. 1A and 1B, annular seal grooves 1b and 1b are provided at both ends of the outer peripheral surface of the inner ring 1, respectively. The seal mounting groove 2b and the seal groove 1b are turned to finish. The inner ring 1 is formed with an outer peripheral surface 1c serving as a shoulder with respect to the rolling surface 1a, a seal groove 1b, and an end outer peripheral surface portion 1d. The outer peripheral surface 1c is arrange | positioned in the radial direction outer position rather than the outer peripheral surface of the edge part outer peripheral surface part 1d. The seal groove 1b is a groove having a substantially U-shaped cross section, and the side wall surface 1ba on the inner side in the axial direction and the other side wall surface 1bb are inclined surfaces.

As shown in FIGS. 3 to 6, slits that allow ventilation between the bearing space 6 and the outside of the bearing through the seal mounting groove 2 b at a plurality of locations in the circumferential direction of the outer peripheral edge portion 9 of the seal member 5. 10, 11, 11 are provided. The slit 10 and the slit 11 are arranged at positions shifted in the circumferential direction (positions shifted in phase by 90 degrees in this example). Further, a communication path Ra (FIGS. 3 and 4) communicating with the slits 10 and 11 is formed to extend in the circumferential direction. The plurality of slits in the circumferential direction include a slit 10 provided on the outer diameter surface of the outer peripheral edge portion 9 and slits 11 and 11 provided on an inner wall surface on the axially inner side of the outer peripheral edge portion 9. As shown in FIGS. 5 (A) to 5 (C), when the internal pressure of the bearing space 6 increases, the air is sequentially vented through the slit 11, the communication path Ra, and the slit 10.
As shown in FIGS. 3 and 6A, the slits 11 and 11 are provided at 180 ° symmetrical positions on the inner wall surface of the outer peripheral edge 9. As shown in FIGS. 2 to 4, each slit 11 is formed in a concave rectangular cross-sectional shape from the inner wall surface to the vicinity of the end surface of the cylindrical portion 8 a of the core metal 8, for example. As shown in FIGS. 3 and 6 (A), the slit 10 is formed at one location with a phase shifted by 90 degrees with respect to the slits 11 and 11. The slit 10 is formed in a semi-cylindrical hole shape from the outer diameter surface to the outer position of the cylindrical portion 8a of the cored bar 8.

  As shown in FIGS. 1B and 2, the seal member 5 is provided with a constricted portion 12 whose inner and outer surfaces are recessed near the inner diameter end. A chamfer 1bc is formed at the corner between the outer peripheral surface 1c extending inward in the axial direction from the seal groove 1b of the inner ring 1 and the side wall surface 1ba. A grease lip 14 is provided on the inner peripheral edge of the seal member 5 so as to be close to the chamfer 1bc and the outer peripheral surface 1c through a seal gap 13. The grease lip 14 is provided on the outer diameter side portion which is the base end side of the constricted portion 12. The grease lip 14 has an outer diameter surface 14a inclined to the outer side in the axial direction, the tip surface of the grease lip 14 is a surface substantially parallel to the inner ring end surface, and the inner diameter surface 14b is the outer periphery of the inner ring. The surface is substantially parallel to the surface 1c.

  The seal member 5 is provided with a main lip 15 whose tip contacts the inner surface of the seal groove 1b, that is, the side wall surface 1ba, and an outer lip 16 facing the outer peripheral surface of the end outer peripheral surface portion 1d near the end surface of the inner ring 1. ing. A contact seal portion or a labyrinth seal gap may be formed between the tip of the outer lip 16 and the outer peripheral surface of the end outer peripheral surface portion 1d. The end outer peripheral surface portion 1d is located on the outer diameter side of the bottom portion of the seal groove 1b. The main lip 15 and the outer lip 16 are provided so as to protrude inward and outward in the axial direction on the inner diameter side which is the distal end side of the constricted portion 12.

The water resistance effect confirmation test will be described.
Comparison of invention product (referred to as “outer diameter slit product” in the specification of Table 1) provided with slits 10, 11 and 11 on the outer peripheral edge 9 of the seal member 5 and slit provided on the inner peripheral edge of the seal member 5 A test was conducted to compare the water resistance of the products (referred to as “inner diameter slit products” in the specifications of Table 1).

  As shown in FIG. 7, the test machine mainly includes a housing 17, a casing 18, a shaft 19, a stirring blade 20, and a rotation drive source (not shown). The outer rings 2 of the pair of test bearings BR1 and BR1 to be tested are fitted into the fitting holes 17a of the housing 17. A shaft 19 is press-fitted into the inner ring 1 of the test bearings BR1 and BR1. Further, an inner ring spacer 21 is interposed between the inner ring end faces, and an outer ring spacer 22 is interposed between the outer ring end faces. A flange portion 17a that protrudes radially outward is provided on the outer diameter surface of the housing 17, and a casing 18 is integrally connected to the flange portion 17a. One end of a shaft 19 is inserted into the casing 18, and a stirring blade 20 is rotatably provided at one end of the shaft 19. Further, the muddy water 23 is supplied into the casing 18 at a predetermined muddy water level P1. In this example, the muddy water level P1 is set at the lower end position of the outer diameter of the outer ring. The other end of the shaft 19 is rotationally driven by the rotational drive source, thereby rotating the stirring blade 20 via the test bearings BR1 and BR1. Thereby, the stirring blade 20 splashes the muddy water 23 inside the casing 18 onto the test bearings BR1 and BR1. After the operation time has elapsed, the mass change amount before and after the test of the test bearings BR1 and BR1 is measured. The greater the amount of mass change, the poorer the water resistance.

The test conditions are as shown in Table 1 below.

表２において、Ｎｏ．１〜４のいずれのサンプルも攪拌羽根から近い方の軸受で、各仕様それぞれｎ＝２実施している。
試験結果より、この発明の外径スリット品は、従来技術の内径スリット品よりも試験前後の質量変化量が小さく耐水性がある。 The test results are as shown in Table 2 and FIG.

In Table 2, no. Each of the samples 1 to 4 has a bearing closer to the stirring blade, and each specification has n = 2.
From the test results, the outer diameter slit product of the present invention has a smaller amount of mass change before and after the test than the inner diameter slit product of the prior art and is water resistant.

The grease leakage resistance effect confirmation test will be described.
Invention product in which slits 10, 11, 11 are provided in the outer peripheral edge 9 of the seal member 5 and a grease lip 14 is provided in the inner peripheral edge of the seal member 5 (“Grease lip + outer diameter” in the specification of Table 3 below) A comparative grease grease leak test was conducted. Of the comparative products, a slit provided on the inner peripheral edge of the seal member and a grease lip provided on the inner peripheral edge of the seal member is referred to as “grease lip + inner diameter slit” in the specification of the following table 3. Among the comparative products, those provided with slits on the inner peripheral edge of the seal member and not provided with grease lips are referred to as “inner diameter slits (no grease lips)” in the specification of Table 3 below.

The test conditions are as shown in Table 3 below.

試験結果より、グリースリップはグリース漏れに対して有効である。 The test results are as shown in Table 4 and FIG.

From the test results, the grease lip is effective against grease leakage.

The amount of grease filled will be described.
The relationship between the amount of grease charged and the grease leakage was tested. The test conditions are grease lubrication, bearing size 6204, inner ring rotational speed 10000 r / min, and radial load 67N. The test results are shown in FIG.
In addition, the relationship between the amount of grease charged and the bearing life was tested. The test conditions are grease lubrication, bearing size 6206, inner ring rotational speed 20000 r / min, and radial load 490N. The test results are shown in FIG.

As shown in FIG. 10, from the result of the grease leakage test, when the amount of grease filled exceeded 80% in the static space volume ratio, the grease leakage was confirmed. Further, when the relationship between the amount of grease filled and the temperature rise of the bearing is confirmed, the temperature rise is large when the amount of grease filled is 85% or more of the static space volume ratio. For this reason, the upper limit of the amount of grease filled is desirably 80%. Further, as shown in FIG. 11, when the amount of grease filled is less than 20% in the total space volume ratio, the bearing life is significantly reduced. For this reason, the upper limit of the amount of grease filled is desirably 20%.

The consistency of grease will be described.
The relationship between the grease consistency and the amount of grease leakage was tested.
The test conditions are as shown in Table 5 below. In this test, the consistency was changed by increasing the proportion of base oil in the grease.

この試験において、グリースのちょう度が３８９以上でグリース漏れが確認された。したがって、グリースのちょう度の上限値は３８９が望ましい。 The test results are as shown in Table 6 and FIG.

In this test, grease leakage was confirmed when the grease consistency was 389 or more. Accordingly, the upper limit value of the grease consistency is preferably 389.

  According to the sealed rolling bearing described above, the outer peripheral edge portion 9 of the seal member 5 is provided with the slits 10, 11, and 11 that allow ventilation between the bearing space 6 and the outside of the bearing through the seal mounting groove 2b. When the internal pressure of the bearing space 6 increases as the temperature of the bearing rises, the air in the bearing escapes through the slits 10, 11, and is discharged outside the bearing. In this case, since the air in the bearing is released as the internal pressure in the bearing space 6 increases, the internal pressure does not increase suddenly and the grease inside the bearing is not discharged. Further, since the main lip 15 at the inner peripheral edge of the seal member 5 is in sliding contact with the side wall surface 1ba of the inner ring 1, the water resistance is also improved. Therefore, foreign matters such as water do not enter the bearing, and the life of the bearing can be improved. Therefore, it is possible to prevent grease leakage and improve water resistance.

  Since the grease lip 14 in the seal member 5 is at an outer diameter position than the main lip 15, the seal gap 13 can be maintained and the labyrinth seal effect can be maintained without being affected by the behavior of the main lip 15. Further, compared with a seal member without the grease lip 14, the grease staying on the outer peripheral surface 1c of the inner ring 1 can be smoothly flowed to the outer diameter side along the outer peripheral surface 14a of the grease lip 14. In other words, it is possible to prevent grease from staying on the outer peripheral surface 1c of the inner ring 1. As a result, it is possible to further prevent grease leakage from the seal groove 1b. Further, since the outer lip 16 facing the outer peripheral surface of the inner ring end portion outer peripheral surface portion 1d is provided on the inner peripheral edge portion of the seal member 5, a labyrinth gap is formed between the tip of the outer lip 16 and the end outer peripheral surface portion 1d. can do. Therefore, water resistance can be further improved.

  Since the slits 10, 11, 11 of the seal member 5 are provided at a plurality of locations in the circumferential direction of the outer peripheral edge portion 9, the internal pressure of the bearing space 6 is smoothly lowered from the slits 10, 11, 11 at these locations. . Therefore, it is possible to prevent the grease leakage by further suppressing the increase in the internal pressure of the bearing space 6. Since the slit 10 provided on the outer diameter surface and the slit 11 provided on the inner wall surface on the inner side in the axial direction are provided at positions shifted in the circumferential direction, water can be prevented from entering from the outside of the bearing, and air in the bearing can be prevented. Can be released smoothly.

The sealed type rolling bearing shown in FIGS. 1 to 6 can be used for automobile auxiliary equipment such as idler pulleys and alternators.
FIG. 13 is a cross-sectional view of a sealed rolling bearing according to an embodiment of the present invention provided on an idler pulley. In this embodiment, the same bearing is fitted to the outer periphery of the shaft Sh, and the pulley PL is rotatably supported by this bearing. According to this idler pulley bearing, the above-described seal member can prevent grease leakage and improve water resistance.

  FIG. 14 is a cross-sectional view in which a sealed type rolling bearing according to an embodiment of the present invention is provided in an alternator. In this embodiment, in the alternator ONT, the shaft Sh1 is inserted into the alternator bearings NN1 and NN2, and the pulley PL is attached to the protruding end. The pulley PL is provided with an engagement groove PL1 on which a transmission belt (not shown) is hung. According to the alternator bearings NN1 and NN2, the above-described seal member can prevent grease leakage and improve water resistance.

  As other embodiments, the sealed rolling bearing of the present invention can be applied to angular ball bearings other than deep groove ball bearings, self-aligning ball bearings, and the like. Instead of the crown-shaped cage shown in FIG. 1, an iron plate corrugated cage may be used. It is also possible to apply a rolling bearing without a cage. The arrangement positions of the slits at a plurality of locations on the seal member are not limited to the positions shown in FIG.

DESCRIPTION OF SYMBOLS 1 ... Inner ring 1b ... Sealing groove 2 ... Outer ring 1a, 2a ... Rolling surface 2b ... Seal mounting groove 3 ... Rolling body 4 ... Cage 5 ... Seal member 6 ... Bearing space 9 ... Outer peripheral edge 10, 11, 11 ... Slit 14 ... Grease lip 15 ... Main lip

Claims (7)

A plurality of rolling elements are interposed between the rolling surfaces of the inner ring and the outer ring, and the outer peripheral edge portion is fitted and fixed to annular seal mounting grooves respectively provided at both ends of the inner peripheral surface of the outer ring. in tightly sealed type rolling bearing for an automobile accessory provided with a sliding contact seal member to the inner ring,
The sealing member includes a recessed waist portion inner and outer surfaces, a grease lip provided on the outer diameter side portion which is proximal to the constriction portion in the axial direction in the inner diameter side of the front end side of the constricted portion The grease lip has a main lip and an outer lip projecting inward and outward, respectively, and the grease lip has an inclined surface that is inclined radially outward as it goes outward in the axial direction, and the tip of the grease lip The surface is substantially parallel to the inner ring end surface, the inner diameter surface of the grease lip is substantially parallel to the inner ring outer diameter surface, and the outer peripheral edge of the seal member is connected between the inner and outer rings via the seal mounting groove. A slit that allows ventilation between the bearing space and the outside of the bearing is provided, and a retainer for holding the rolling elements is provided. The amount of grease sealed in the bearing space between the inner and outer rings is 20 in terms of the total space volume ratio. % Or more of the bearing space The static space volume ratio, which is the volume ratio with respect to the static space excluding the space where the rolling elements and the cage revolve, is 80% or less, and the consistency of the grease sealed in the bearing space between the inner and outer rings is Sealed type rolling bearing characterized by being less than 389. In claim 1, the annular seal groove provided on the outer peripheral surface of the inner ring, the inner peripheral edge portion of the sealing member, and the main lip that Sessu the inner surface of the seal groove, an outer diameter position than the main lip sealed rolling bearing tip extending axially inward is provided and the grease lip you close through the sealing gap on the outer peripheral surface of the inner ring from. 3. The outer peripheral surface portion of the inner ring, which is positioned on the outer diameter side of the bottom of the seal groove, is provided on the outer side in the axial direction of the seal groove. part outer peripheral surface sealed rolling bearing provided with the outer lip you face the outer peripheral surface of the. In any one of claims 1 to 3, sealed rolling bearing slits of the sealing member, provided in the circumferential direction a plurality of locations of the outer periphery. 5. The slits at a plurality of locations in the circumferential direction of the seal member according to claim 4 include slits provided on an outer diameter surface of the outer peripheral edge portion and slits provided on an inner wall surface in the axial direction inside of the outer peripheral edge portion. Sealed rolling bearing. The sealed rolling bearing according to claim 5 , wherein the slit provided on the outer diameter surface and the slit provided on the inner wall surface on the inner side in the axial direction are provided at positions shifted in the circumferential direction. The sealed rolling bearing according to claim 6 , wherein a communication path that communicates between a slit provided in the outer diameter surface and a slit provided in the inner wall surface on the inner side in the axial direction is provided in an outer peripheral edge portion of the seal member.

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