JP2010281380A - Sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device of which muddy water resistance does not easily drops even if a seal lip wear and tension force of the seal lip drops as time elapses. <P>SOLUTION: An annular felt 71 made of material softer than an elastic member 51 is fixed on an inner circumference surface part 70 overlapping a radial direction outer end surface 67 of the flange part 66 of the slinger 52 in a radial direction by adhesive or the like in a seal member 48. An inner circumference surface at a radial direction inner part of the felt 71 is made contact on the end surface 67 of the slinger 52. An end surface 77 of a radial direction outer part of the felt 71 is made face to an outside. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sealing device, and particularly suitable for use in a rolling bearing in which a raceway member having a raceway surface is composed of only a plurality of cylindrical members, a rolling bearing for wheels, a water pump, or a motor using a rolling bearing. The present invention relates to a sealing device.

  Conventionally, as a sealing device, there is one described in Japanese Patent Laid-Open No. 9-292032 (Patent Document 1). The sealing device includes a sealing member and a metal slinger having an L-shaped cross section, and the sealing member includes a metal cored bar portion having a substantially L-shaped cross section, and an elastic portion fixed to the cored bar portion. Have

  The core metal part includes a cylindrical part and an annular part, and the annular part extends radially inward from one axial end part of the inner peripheral surface of the cylindrical part. The slinger also has a cylindrical portion and an annular portion, and the annular portion extends radially outward from the other axial end of the outer peripheral surface of the cylindrical portion. The annular part of the cored bar part is located inward in the axial direction from the annular part of the slinger.

  The elastic portion has a seal lip portion that extends toward the annular portion of the slinger and is in sliding contact with the annular portion of the slinger. An outer end surface in the radial direction of the annular portion of the slinger is opposed to the seal member at a radial interval.

In such a background, in the sealing device, it is inevitable that the seal lip wears due to sliding of the seal lip with time. For this reason, in the conventional sealing device described above, it is difficult to avoid a decrease in the tightening force of the seal lip due to wear of the seal lip, and it is difficult to avoid a decrease in muddy water resistance.
Japanese Patent Laid-Open No. 9-292032 (FIG. 2)

  Therefore, an object of the present invention is to provide a sealing device in which mud water resistance is hardly lowered even when the seal lip is worn over time and the tightening force of the seal lip is reduced.

In order to solve this problem, the sealing device of the present invention includes:
A first annular member having a peripheral surface;
A second annular member having a circumferential surface opposed to the circumferential surface of the first annular member in the radial direction;
An annular porous member fixed to the peripheral surface of the second annular member, in contact with the peripheral surface of the first annular member, and facing one side in the axial direction to the outside;
The second annular member has an annular elastic portion,
The elastic portion has a seal lip that is in sliding contact with the first annular member,
The porous member is characterized by being softer than the elastic portion.

  According to the present invention, a porous member that is fixed to the peripheral surface of the second annular member, contacts the peripheral surface of the first annular member, and is softer than the elastic portion is provided. When the muddy water passes between the first annular member and the second annular member, it is absorbed by the porous member, and the intrusion into the muddy water is suppressed by the porous member. Can do. Therefore, muddy water resistance can be improved.

  According to the invention, the porous member fixed to the peripheral surface of the second annular member and contacting the peripheral surface of the first annular member is made of a material softer than the elastic portion. Therefore, no large frictional force is generated between the porous member and the peripheral surface of the first annular member. Furthermore, the moisture absorbed in the porous member plays a role as a lubricant, and the presence of this moisture reduces the frictional force between the porous member and the first annular member. Therefore, even if the porous member is installed, the torque hardly increases.

In one embodiment,
A covering portion that covers the opposite side of the porous member from the outside is provided.

  According to the embodiment, since the covering portion that covers the side opposite to the outer side of the porous member is provided, intrusion into the inner side of the muddy water absorbed by the porous member (the side opposite to the outer side) is performed. This is hindered by the covering portion. Moreover, since a part of the porous member faces the outside, the muddy water absorbed by the porous member can be discharged to the outside through a part of the porous member, Evaporation of muddy water to the outside can be promoted. Furthermore, since the porous member is configured to slide against the first annular member in contact with the peripheral surface of the first annular member, frictional heat generated due to the sliding. Thus, evaporation of water in the muddy water can be promoted, and release of the muddy water to the outside can be promoted. Therefore, it is possible to remarkably suppress the intrusion of muddy water into the interior, and to significantly improve the muddy water resistance.

  According to the sealing device of the present invention, since the porous device is fixed to the peripheral surface of the second annular member, is in contact with the peripheral surface of the first annular member, and is softer than the elastic portion, When the muddy water passes between the first annular member and the second annular member, the porous member will absorb the muddy water, and the porous member suppresses the intrusion of the muddy water. it can. Therefore, muddy water resistance can be improved.

  According to the sealing device of the present invention, since the porous member that contacts the peripheral surface of the first annular member is made of a material softer than the elastic portion, the porous member and the periphery of the first annular member A large frictional force is not generated between the surface and the surface, and the frictional force is further reduced by moisture absorbed by the porous chamber member. Therefore, even if the porous member is installed, the torque hardly increases.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a sectional view in the axial direction of a wheel rolling bearing according to an embodiment of the present invention.

  The wheel rolling bearing includes an inner shaft 2, an outer ring 3, an inner ring 4, a plurality of first balls 5, a plurality of second balls 6, a first sealing device 8 according to an embodiment of the present invention, and the present invention. The second sealing device 9 of one embodiment is provided.

  The inner shaft 2 has a disc-shaped brake disk mounting flange 10 that extends in the radial direction for mounting the brake disk 11 at one end in the axial direction. A plurality of bolt through holes are formed on a concentric circle centered on the approximate center of the brake disk mounting flange 10. With the brake disc 11 in contact with the brake disc mounting flange 10, and with the wheel member 13 in contact with the brake disc 11, the end surface of the wheel member 13 opposite to the brake disc 11 side; A plurality of bolts 15 are used to fix the brake disk mounting flange 10.

  An inner ring 4 is externally fitted and fixed to the other axial end of the inner shaft 2. An angular first raceway groove 16 as a first raceway surface is formed between the inner race 4 and the brake disk mounting flange 10 in the inner shaft 2, while the outer raceway of the inner race 4 is formed on the outer circumference surface of the inner race 4. An angular second track groove 17 is formed as a second track surface.

  The outer ring 3 is disposed on the other end side of the brake disc mounting flange 10 in the inner shaft 2 so as to face the inner shaft 2 in the radial direction. The outer ring 3 has a vehicle body side mounting flange 14 that extends in the radial direction on the other end side in the axial direction. A plurality of bolt through holes for inserting bolts for attaching the vehicle body side mounting flange 14 to the vehicle body side (knuckle) are formed in the disk-shaped vehicle body side mounting flange 14. The outer ring 3 includes an angular third track groove 26 and an angular fourth track groove 27 that are axially spaced apart from each other on the inner peripheral surface of the outer ring 3. The angular third track groove 26 includes: It is positioned on the one end side (the brake disc mounting flange 10) from the angular type fourth raceway groove 27.

  The plurality of first balls 5 are spaced by a predetermined interval in the circumferential direction while being held by the cage 18 between the first raceway groove 16 of the inner shaft 2 and the third raceway groove 26 of the outer ring 3. They are spaced apart. The plurality of second balls 6 are held by a retainer 19 between the second raceway groove 17 of the inner ring 4 and the fourth raceway groove 27 of the outer ring 3 with a predetermined interval in the circumferential direction. Has been placed.

  The first sealing device 8 is disposed in the vicinity of the opening on the one end side (the brake disc mounting flange 10 side) in the axial direction between the inner shaft 2 and the outer ring 3. The first sealing device 8 seals the opening on the one end side between the inner shaft 2 and the outer ring 3. On the other hand, the second sealing device 9 is disposed between the inner ring 4 and the outer ring 3 in the vicinity of the opening on the other end side in the axial direction (the side opposite to the brake disk mounting flange 10 side). The second sealing device 9 seals the opening on the other end side between the inner ring 4 and the outer ring 3. The second sealing device 9 has the same structure as the first sealing device 8.

  2 and 3 are cross-sectional views illustrating the structure of the first sealing device 8 in detail. Specifically, FIG. 2 is a cross-sectional view in the axial direction showing the positional relationship among the cored bar member 50, the elastic member 51, and the slinger 52 at the assembly position. FIG. 2 shows the position of the elastic member 51 at the assembly position of the elastic member when it is assumed that the elastic member 51 does not receive a force from the slinger 52. On the other hand, FIG. 3 is a cross-sectional view showing the position of the elastic member 51 and the position of the slinger 52 in a state where the elastic member 51 is assembled to the slinger 52 and the elastic member 51 is not worn. It is. The second sealing device 9 has the same structure as the first sealing device 8.

  The second sealing device 9 is disposed between the inner ring 4 and the outer ring 3 in the vicinity of the opening on the other end side in the axial direction with the left and right sides in the axial direction reversed in FIGS. 2 and 3. Yes. The description of the second sealing device 9 is omitted from the description of the first sealing device 8.

  As shown in FIG. 2, a first sealing device (hereinafter simply referred to as a sealing device) 8 includes a cored bar member 50, an elastic member 51, a slinger 52 as a first annular member, and an example of a porous member. It has an annular felt 71 and an annular rubber member 74 as an example of a covering portion. The core metal member 50 and the elastic member 51 are fixed and integrated with each other. The core metal member 50 and the elastic member 51 constitute a seal member 48 as a second annular member.

  The core metal member 50 is formed in an annular shape. The core bar member 50 has an L-shaped cross section. The core member 50 includes a cylindrical portion 60 and an annular portion 61. The cylindrical portion 60 is fitted and fixed to the inner peripheral surface of the outer ring 3 (see FIG. 1). The cylindrical portion 60 extends substantially in the axial direction. On the other hand, the annular portion 61 extends inward in the radial direction from the other end side in the axial direction of the cylindrical portion 60 (left side in the drawing of FIG. 2).

  The slinger 52 is formed in an annular shape. The slinger 52 has an L-shaped cross section. The slinger 52 has a cylindrical portion 65 and a flange portion 66 as an annular portion. The cylindrical portion 65 is fitted and fixed to the outer peripheral surface of the inner shaft 2. In the second sealing device 9, needless to say, the member to which the slinger is fixed is the inner ring 4.

  The cylindrical portion 65 extends substantially in the axial direction, while the flange portion 66 extends radially outward from one axial end portion side (the right side in FIG. 2) of the outer peripheral surface of the cylindrical portion 65. Extends towards. The flange portion 66 is located outward in the axial direction from the annular portion 61 of the cored bar member 50. Most of the flange portion 66 excluding a part on the inner side in the radial direction is opposed to the annular portion 61 of the core metal member 50 in the axial direction through a gap.

  The elastic member 51 is formed in an annular shape. The elastic member 51 includes the entire inner peripheral surface of the cylindrical portion 60 of the cored bar member 50 and the entire end surface on the outer side in the axial direction of the annular portion 61 connected to the inner peripheral surface of the cylindrical portion 60. It is fixed to the cored bar member 50 so as to cover it.

  The elastic member 51 has a base 53, a first axial lip 54, and a second axial lip 55. Specifically, the elastic member 51 is made of a rubber material. As the rubber material, for example, nitrile rubber, hydrogenated nitrile rubber, acrylic rubber, silicon rubber, and fluorine rubber can be suitably used.

  The base portion 53 is disposed along the inner peripheral surface of the cylindrical portion 60 of the core metal member 50 and the end surface on the outer side in the axial direction of the annular portion 61 of the core metal member 50. The base portion 53 is fixed to the inner peripheral surface of the cylindrical portion 60 of the core metal member 50 and the outer end surface of the annular portion 61 of the core metal member 50.

  The first axial lip 54 extends from the base 53 to the outer ring 3 (see FIG. 1) side and the axially outer side (flange portion 66 side).

  The second axial lip 55 is spaced radially from the first axial lip 54 on the radially inner shaft 2 (see FIG. 1) side (inward radial direction) of the first axial lip 54. Is located. The second axial lip 55 has a first portion 56 and a second portion 57. The first portion 56 extends from the base 53 to the radially inner shaft 2 side and to the axially outer side. The second portion 57 is connected to the distal end of the first portion 56 on the outer side in the axial direction, and extends to the outer ring 3 side in the radial direction and outward in the axial direction.

  As shown in FIG. 2, the position of the elastic member 51 when it is assumed that the elastic member 51 does not receive a force from the slinger 52 overlaps the slinger 52 at the assembly position. Specifically, the axially outer tip of the first axial lip 54 of the elastic member 51 and the axially outer tip of the second axial lip 55 of the elastic member 51 are the flange portions 66 of the slinger 52. In the second axial lip 55, a bent portion located in the vicinity of the connection portion between the first portion 56 and the second portion 57 (one portion of the second axial lip 55 that is opposed to the tubular portion 65 in the radial direction). Part) 90 overlaps the cylindrical part 65 of the slinger 52.

  In addition, as shown in FIG. 2, in a state before the elastic member 51 is assembled into the slinger 52, the radially inner surface 58 of the first portion 56 is a concave surface, whereas the radial direction of the second portion 57. The inner surface 59 is a conical surface. In the cross section in the axial direction, the curvature of the radially inner surface 58 of the first portion 56 increases toward the outer side in the axial direction (on the flange portion 66 side in the axial direction). Specifically, in the axial cross section, the radially inner surface 58 of the first portion 56 is smoothly connected to the substantially conical surface portion located on the base 53 side and the conical surface portion. At the same time, it is composed of a part consisting of a part of a substantially spheroidal surface whose curvature increases toward the outside in the axial direction (on the flange 66 side in the axial direction).

  The inner surface 59 in the radial direction of the second portion 57 is differentiable from one end to the other end in the axial section, and the surface 59 is smoothly connected.

  As shown in FIG. 3, the first axial lip 54 and the second portion 57 of the second axial lip 55 have a seal member 48 and a slinger 52 that are substantially centered on the central axis of the wheel rolling bearing during assembly. Slidably slides on the flange portion 66 of the slinger 52.

  As shown in FIG. 3, the second axial lip 55 is positioned at a radial interval with respect to the cylindrical portion 65 of the slinger 52 in the assembled state and in the non-wearing state after the assembly. Yes. That is, as shown in FIGS. 2 and 3, the cored bar member 50 and the slinger 52 are axially arranged so that the annular part 61 of the cored bar member 50 and the flange part 66 of the slinger 52 approach each other during assembly. By making the relative movement, the first axial lip 54 and the second portion 57 of the second axial lip 55 move radially outward along the surface of the flange portion 66 of the slinger 52. Then, the bent portion 90 between the first portion 56 and the second portion 57 moves outward in the radial direction, and the bent portion 90 moves outward from the outer peripheral surface of the cylindrical portion 65 in the radial direction. It has come to surface.

  In the present embodiment, since there is no fastening member such as a garter spring that presses the bent portion 90 inward in the radial direction, the bent portion 90 can be easily and reliably removed from the outer peripheral surface of the tubular portion 65 in the radial direction. It can float on the outer ring 3 side. If there is a fastening member such as a garter spring that presses the bent portion inward in the radial direction, the bent portion may not float to the outer ring side in the radial direction from the outer peripheral surface of the cylindrical portion of the slinger.

  As described above, the position of the bent portion 90 when the elastic member 51 is assumed not to receive a force from the slinger 52 is set so as to overlap the tubular portion 65. In a state where the contact surface pressure against the flange portion 66 of the second axial lip 55 is reduced by a predetermined force or more due to wear of the second portion 57 of the second axial lip 55, the bent portion 90 is formed in the cylindrical portion 65 of the slinger 52. The cylindrical member 65 is slid by the relative rotation of the seal member 48 and the slinger 52 about the central axis of the wheel rolling bearing. That is, the bent portion 90 plays the role of a radial lip in a state where the contact surface pressure against the flange portion 66 of the second axial lip 55 is reduced by a predetermined force or more due to wear of the second portion 57 of the second axial lip 55. It is like that.

  The space formed by the first axial lip 54, the second axial lip 55, and the slinger 52, or the space surrounded by the second axial lip 55 and the slinger 52 is filled with an appropriate amount of grease as a lubricant. The sliding portion between the first axial lip 54 and the slinger 52 and the sliding portion between the second axial lip 55 and the slinger 52 are lubricated by the grease.

  Further, in FIG. 3, a rolling element connected to the region surrounded by the second axial lip 55 and the slinger 52 and located on the inner side in the axial direction (left side in the drawing) from the first sealing device 8 (this embodiment) In the form, a lubricant (in this embodiment, grease) is sealed in the rolling element arrangement chamber in which the balls 18, 19) are arranged.

  Referring again to FIG. 2, the annular felt 71 has an inner peripheral surface portion 70 that overlaps the radial outer end surface 67 of the flange portion 66 of the slinger 52 in the radial direction at the base 53 of the elastic member 51. Further, it is fixed with an adhesive or the like. As shown in FIG. 2, the felt 71 has a substantially rectangular cross section. The inner peripheral surface in the radial direction of the felt 71 is in contact with the substantially entire surface of the end surface 67 of the flange portion 66 of the slinger 52. An outer end face 77 in the axial direction of the felt 71 faces the outside. The felt 71 is made of a material softer than the elastic member 51.

  The rubber member 74 as the covering portion has an annular shape. The rubber member 74 is made of rubber through which moisture cannot pass. The outer end surface (outer peripheral surface) in the radial direction of the rubber member 74 is fixed to the inner peripheral surface of the base 53 of the elastic member 51 with an adhesive or the like. The rubber member 74 is in contact with a portion located on the outer side in the radial direction on the end surface of the felt 71 opposite to the outer side in the axial direction. The rubber member 74 is located radially outward from the end surface 67 of the flange portion 66. The rubber member 74 is located at a distance from the flange portion 66.

  The radially outer end face 67 of the flange portion 66 constitutes an outer peripheral face, and this outer peripheral face constitutes the peripheral face of the first annular member. Further, in the seal member 48, an inner peripheral surface portion 70 facing the outer peripheral surface (end surface 67) at a radial interval constitutes a peripheral surface of the second annular member.

  According to the first and second sealing devices 8 and 9, they are fixed to the inner peripheral surface of the seal member 48 and contact the radially outer end surface (outer peripheral surface) 67 of the flange portion 66 of the slinger 52. And since the felt 71 softer than the elastic member 51 is provided, when the muddy water from the outside passes between the sealing member 48 and the slinger 52, the felt 71 absorbs the muddy water. Intrusion into the interior can be suppressed by the felt 71. Therefore, muddy water resistance can be improved.

  Further, according to the first and second sealing devices 8 and 9, the felt 71 fixed to the inner peripheral surface of the seal member 48 and in contact with the end surface 67 of the flange portion 66 of the slinger 52 is provided with the elastic member 51. Since it is made of a softer material, no large frictional force is generated between the felt 71 and the end surface 67 of the slinger 52. Furthermore, the moisture absorbed in the felt 71 plays a role as a lubricant, and the presence of this moisture further reduces the frictional force between the felt 71 and the end surface 67 of the slinger 52. Therefore, even if the felt 71 is installed, the torque hardly increases.

  Further, according to the first and second sealing devices 8 and 9, since the rubber member 74 that covers the end surface of the felt 71 opposite to the outer side in the axial direction is provided, the inside of the muddy water absorbed by the felt 71 is provided. The rubber member 74 prevents entry into Further, since a part of the felt 71 faces the outside, the muddy water absorbed by the felt 71 can be discharged to the outside through the part of the felt 71, Can promote evaporation. Furthermore, since the felt 71 slides with respect to the end surface 67 of the slinger 52, the evaporation of moisture in the muddy water is caused by frictional heat generated due to the sliding of the felt 71 with respect to the slinger 52. This facilitates the release of the muddy water to the outside. Therefore, the intrusion into the mud water can be further promoted and the mud water resistance can be remarkably improved.

  In the first and second sealing devices 8 and 9, the seal lip is composed of the first axial lip 54 and the second axial lip 55. In the present invention, the seal lip includes the radial lip. Alternatively, the seal lip may be composed only of a radial lip. In short, each seal lip may have any shape and form as long as there is at least one seal lip that extends from the base of the elastic member and contacts the slinger.

  Further, in the first and second sealing devices 8 and 9, the rubber member 74 as the covering portion exists on the side opposite to the outer side in the axial direction of the felt 71. A covering portion other than rubber, such as resin, may be disposed on the side opposite to the outer side in the axial direction. Moreover, in this invention, a coating | coated part does not need to exist in the opposite side to the axial direction exterior side of a porous member.

  In the first and second sealing devices 8 and 9, the felt 71 is used as the porous member. However, in the present invention, a porous member other than felt, such as sponge, foam, or cotton, is used as the porous member. It may be adopted.

  In the first and second sealing devices 8 and 9, the felt 71 is fixed to the seal member 48 which is a stationary member. However, in the present invention, the porous member may be fixed to the rotating member side.

  In the first and second sealing devices 8 and 9, both the cored bar member 50 and the slinger 52 have a substantially L-shaped cross section. However, in the present invention, the cored bar member and the slinger At least one of them may not have an L-shaped cross section.

  In short, the present invention provides an annular through hole (for example, corresponding to reference number 121 in FIG. 2) between the external space and the chamber (for example, corresponding to reference number 120 in FIG. 2). In the sealing structure having a structure that communicates with each other, one of the outer peripheral surface and the inner peripheral surface of the annular through hole is in contact with the other of the outer peripheral surface and the inner peripheral surface, It can be created by arranging an annular porous member. For example, the present invention can be created by disposing a porous member in a structure having a labyrinth seal so as to close a gap of the labyrinth seal.

  In the wheel rolling bearing described above, the sealing devices 8 and 9 according to an embodiment of the present invention are disposed in the vicinity of the openings on both sides in the axial direction of the rolling element (ball) arrangement chamber (lubricant enclosure chamber). However, the sealing device of the present invention may be arranged only in the vicinity of the opening on one side in the axial direction of the rolling element arrangement chamber (lubricant enclosure chamber) of the wheel rolling bearing. Further, in the wheel rolling bearing, the rolling elements are not balls, but may be rollers or both balls. The fact that the rolling element is a roller includes a case where the rolling element is a tapered roller and a case where the rolling element is a cylindrical roller. However, when the rolling element is a roller, the rolling element is preferably a tapered roller. The second sealing device 9 according to an embodiment of the present invention is disposed near the opening on the other end side in the axial direction between the inner ring 4 and the outer ring 3 and does not have the brake disk mounting flange 10. Therefore, the slinger 50 can be easily attached to the inner ring 4 and the seal member 48 can be easily attached to the outer ring 3.

  FIG. 4 is an enlarged cross-sectional view around the sealing device 99 of the water pump.

  The water pump includes a pump shaft 100, a mechanical seal 101, a pump housing 102, an outer ring 105, and a sealing device 99 according to an embodiment of the present invention. The pump housing 102 has a drain hole 107 that penetrates the pump housing 102. The outer ring 105 is fitted and fixed to the inner peripheral surface of the pump housing 102.

  The pump shaft 100, the outer ring 105, and the sealing device 99 form part of a water pump bearing of the water pump. That is, although not shown, on the side indicated by the arrow a in FIG. 4 on the inner peripheral surface of the outer ring 105, a deep groove type raceway groove and a cylindrical raceway surface are provided from the side closer to the sealing device 99 at an axial interval. 4 is formed on the side of the outer peripheral surface of the pump shaft 100 as indicated by the arrow a in FIG. 4 from the side closer to the sealing device 99 at an axial interval and a deep groove type track groove and a cylindrical track. A surface is formed.

  Between the raceway groove of the outer ring 105 and the raceway groove of the pump shaft 100, a plurality of balls held in a cage are arranged at a predetermined interval in the circumferential direction. A plurality of cylindrical rollers held by a cage are arranged between the cylindrical raceway surface of the outer ring 105 and the cylindrical raceway surface of the pump shaft 100 at a predetermined interval in the circumferential direction. ing.

  The metal core portion 150 of the sealing device 99 is fitted and fixed to the inner peripheral surface of the outer ring 105 as the first raceway ring, while the slinger 152 of the sealer 99 is a pump shaft as the second raceway ring. The outer peripheral surface of 100 is fitted and fixed. Further, the felt 174 as an example of the porous member closes an annular through hole defined by the seal member 148 and the slinger 152 on the mechanical seal 101 side of the sealing device 99. A rubber member 174 as an example of a covering portion covers an end surface of the felt 174 opposite to the mechanical seal 101 side in the axial direction. The sealing device 99 seals the opening on the mechanical seal 101 side between the outer ring 105 and the pump shaft 100. In this manner, the cooling water in the pump chamber leaking from the mechanical seal 101 in the direction indicated by the arrow b is prevented from entering the water pump bearing.

  The leaked cooling water in the pump chamber is surely discharged to the outside in the direction indicated by the arrow c through the drain hole 107 formed in the pump housing 102. In FIG. 4, 111 indicates a rubber sleeve of the mechanical seal 101, and 110 indicates a coil spring of the mechanical seal 101.

  When the sealing device 99 of the present invention is installed in the water pump as in the water pump shown in FIG. 4, it is possible to greatly suppress the leaked cooling water of the pump chamber from entering the sealing device 99. The life of the bearing can be extended.

  In the above embodiment, the sealing device of the present invention is set to a rolling bearing for a wheel or a water pump. However, the sealing device of the present invention may be arranged so as to seal at least one opening between the outer ring and the inner ring in a rolling bearing in which the race member having the raceway surface is an outer ring and an inner ring. Moreover, you may install the sealing device of this invention in the rolling bearing arrange | positioned between a rotor member and a stator member in a motor.

It is sectional drawing of the axial direction of the rolling bearing for wheels of one Embodiment of this invention. It is sectional drawing explaining the structure of a 1st sealing device in detail. It is sectional drawing explaining the structure of a 1st sealing device in detail. It is an expanded sectional view around the sealing device of the water pump of one embodiment of the present invention.

2 Inner shaft 3 Outer ring 4 Inner ring 5 First ball 6 Second ball 8 First sealing device 9 Second sealing device 48,148 Seal member 50,150 Metal core member 51 Elastic member 52,152 Slinger 53 Base 54 First Axial lip 55 Second axial lip 56 First part 57 Second part 58 Radial inner surface of first part 59 Radial inner surface of second part 60 Cylindrical part of core metal member 61 Core metal Ring part of member 65 Cylindrical part of slinger 66 Flange part of slinger 71,171 Felt 74,174 Rubber member 99 Sealing device

Claims (2)

A first annular member having a peripheral surface;
A second annular member having a circumferential surface opposed to the circumferential surface of the first annular member in the radial direction;
An annular porous member fixed to the peripheral surface of the second annular member, in contact with the peripheral surface of the first annular member, and facing one side in the axial direction to the outside;
The second annular member has an annular elastic portion,
The elastic portion has a seal lip that is in sliding contact with the first annular member,
The sealing device, wherein the porous member is softer than the elastic portion. The sealing device according to claim 1,
A sealing device comprising a covering portion that covers a side opposite to the outer side of the porous member.

Images