JP5369902B2 - Sealing device and rolling bearing device - Google Patents

Description

  The present invention relates to a sealing device, and in particular, is used for a rolling bearing device in which a raceway member having a raceway surface is composed of only a plurality of cylindrical members, a rolling bearing device for a wheel, a water pump, or a motor using the rolling bearing device. And a suitable sealing device. The present invention also relates to a rolling bearing device having a sealing device and rolling elements.

  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 part has a cylindrical part and a radially extending part, and the radial extension extends radially inward from one axial end of the inner peripheral surface of the cylindrical part. . Moreover, the said slinger has a cylindrical part and a flange part, and the flange part has spread outward in the radial direction from the other end part of the axial direction of the outer peripheral surface of a cylindrical part. Most of the radially extending part of the cored bar part is opposed to the flange part of the slinger in the axial direction.

  The elastic portion has a seal lip portion that extends toward the flange portion of the slinger and slides on the flange portion of the slinger. The radially outer tip of the flange 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.

  Further, there is a demand for reducing the torque resulting from the sliding of the seal lip portion on the slinger.

Japanese Patent Laid-Open No. 9-292032 (FIG. 2)

  Accordingly, an object of the present invention is to provide a sealing device in which the sliding portion is not easily worn, the mud water resistance is hardly lowered, and torque can be suppressed.

In order to solve the above problems, the sealing device of the present invention is:
A cored bar member having a cylindrical part and an annular radial extending part extending from the cylindrical part in a substantially radial direction of the cylindrical part;
An elastic member fixed to the core member,
The elastic member is
An annular and integral base fixed to the peripheral surface and the end surface so as to cover the peripheral surface of the cylindrical portion of the core member and the axial end surface of the radially extending portion;
An annular projecting portion projecting from the portion fixed to the radially extending portion of the base portion toward the tubular portion;
In use, a part of the annular surface of the protrusion opposite to the cylindrical part is slid on the sliding member, and the tip of the protrusion is It is characterized in that it comes into contact with the portion fixed to the cylindrical part.

  According to the present invention, in the state of use, a part of the annular surface on the opposite side to the cylindrical part side of the protruding part slides on the sliding member, and the tip part of the protruding part is The base is in contact with the portion fixed to the cylindrical portion. That is, according to the present invention, the center portion of the annular surface of the protruding portion (referring to a portion other than both end portions of the annular surface) hits the sliding member, whereby sealing is performed. Therefore, it is possible to suppress the wear of the sliding portion of the elastic member as compared with the conventional configuration, that is, the configuration in which the tip of the axial lip slides against the sliding member at the edge. Therefore, even if the usage time elapses, the muddy water resistance is unlikely to decrease.

  Further, according to the present invention, since the central portion of the annular surface of the protruding portion hits against the sliding member, the sliding of the protruding portion is compared with the conventional configuration per edge. The moving part does not strongly press the sliding member. Therefore, torque can be suppressed.

  Further, according to the present invention, in the state of use, the distal end portion of the protruding portion comes into contact with the portion fixed to the cylindrical portion of the base portion, so that the protruding portion can be positioned in the used state. . Therefore, the difference between the force at which the central portion of the annular surface of the protruding portion presses the sliding member and the desired force can be reduced, and the sealing performance of the sealing device can be made close to the desired performance. .

  Further, according to the present invention, in the state of use, the tip end portion of the protruding portion comes into contact with the portion fixed to the cylindrical portion of the base portion, and the protruding portion has a wider range in the radial direction. Since it is configured to cover, more foreign matter from the outside is repelled by the protruding portion as compared with the conventional configuration. Therefore, compared with the conventional configuration, the muddy water resistance of the sealing device can be improved.

The rolling bearing device of the present invention is
A sealing device of the present invention;
A first race member having a circumferential surface to which the cylindrical portion is fixed, and a raceway surface;
A second track member that includes the slide member or that has the track surface fixed to the slide member;
A rolling element is provided between the raceway surface of the first raceway member and the raceway surface of the second raceway member.

  ADVANTAGE OF THE INVENTION According to this invention, abrasion of the sliding part of a sealing device can be suppressed and the fall of the muddy water resistance of a sealing device can be suppressed. Moreover, the torque resulting from the sealing device can be suppressed.

  According to the sealing device of the present invention, the sliding portion is not easily worn, the mud water resistance is hardly lowered, and the torque can be suppressed.

It is sectional drawing of the axial direction of the rolling bearing apparatus for wheels which is 1st Embodiment of this invention. It is a partial expanded sectional view of the 1st sealing device periphery in FIG. It is an expanded sectional view around the sealing device of the water pump of the second embodiment.

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

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

  This wheel rolling bearing device includes an outer ring 2 as a first race member, an inner shaft 3 as a second race member, an inner race 4, a plurality of first balls 5, a plurality of second balls 6, and a first sealing device. 8 and the second sealing device 9 of the first embodiment of the present invention. The said 1st ball | bowl 5 and the 2nd ball | bowl 6 comprise a rolling element.

  The inner shaft 3 has a disc-shaped brake disk mounting flange 10 extending 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 disk 11 in contact with the brake disk mounting flange 10 and with the wheel member 13 in contact with the brake disk 11, an end surface of the wheel member 13 opposite to the brake disk 11 side; The brake disk mounting flange 10 is fixed with a plurality of bolts 15.

  An inner ring 4 is externally fitted and fixed to the other axial end portion of the inner shaft 3. An angular type raceway groove 16 as a raceway surface is formed between the inner ring 4 and the brake disc mounting flange 10 in the inner shaft 3. An angular type raceway groove 17 as a raceway surface is formed on the outer peripheral surface of the inner ring 4.

  The outer ring 2 is disposed on the other end side of the brake disc mounting flange 10 in the inner shaft 3 so as to face the inner shaft 3 in the radial direction. The outer ring 2 has a vehicle body side mounting flange 14 extending 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 2 has an angular first raceway groove 26 as a first raceway surface and an angular second raceway groove 27 as a second raceway surface, which are spaced apart in the axial direction on the inner peripheral surface of the outer ring 2. doing. The first track groove 26 is located on the one end side with respect to the second track 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 raceway groove 16 of the inner shaft 3 and the first raceway groove 26 of the outer ring 2. Are arranged. The plurality of second balls 6 are spaced by a predetermined interval in the circumferential direction while being held by the cage 19 between the raceway groove 17 of the inner ring 4 and the second raceway groove 27 of the outer ring 2. 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 3 and the outer ring 2. The first sealing device 8 seals the opening on the one end side between the inner shaft 3 and the outer ring 2.

  On the other hand, the second sealing device 9 is disposed between the inner ring 4 and the outer ring 2 in the vicinity of the opening on the other end side (the vehicle body mounting flange 14 side) in the axial direction. The second sealing device 9 seals the opening on the other end side between the inner ring 4 and the outer ring 2.

  FIG. 2 is a partially enlarged cross-sectional view around the second sealing device 9 in FIG.

  As shown in FIG. 2, the second sealing device (hereinafter simply referred to as a sealing device) 9 includes an annular cored bar member 50, an annular elastic member 51, and an annular slinger 52 as an example of a sliding member. The cored bar member 50 and the elastic member 51 are fixed and integrated with each other.

  The core bar member 50 has an L-shaped cross section. The core metal member 50 includes a cylindrical portion 60 and an annular radial extending portion 61. The cylindrical part 60 is fitted and fixed to the inner peripheral surface of the outer ring 2 (see FIG. 1). The cylindrical portion 60 extends substantially in the axial direction. On the other hand, the radially extending 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 has an L-shaped cross section. The slinger 52 has a cylindrical portion 65 and an annular flange portion 66. The cylindrical portion 65 of the cylindrical slinger 52 is fitted and fixed to the outer peripheral surface of the inner ring 4 (see FIG. 1).

  The cylindrical portion 65 of the slinger 52 extends substantially in the axial direction, while the flange portion 66 extends radially from one end side in the axial direction of the outer peripheral surface of the cylindrical portion 65 (on the right side in FIG. 2). It extends outward. The flange portion 66 is located outward in the axial direction from the radially extending portion 61 of the cored bar member 50. Most of the flange portion 66 excluding a part inward in the radial direction is opposed to the radially extending portion 61 of the core member 50 in the axial direction with a gap.

  The elastic member 51 has a base 53, a protrusion 54, an axial lip 55, and a radial lip 56. 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 integral and annular, and has an outer surface in the axial direction of the radially extending portion 61 connected to the entire inner peripheral surface of the cylindrical portion 60 of the core member 50 and the inner peripheral surface of the cylindrical portion 60. The core metal member 50 is fixed so as to cover the entire end face on the side and the radially inner end of the radially extending portion 61.

  The protruding portion 54 protrudes and extends from a portion (hereinafter referred to as a first portion) 80 that is fixed to the radially extending portion 61 of the base portion 53. The protrusion 54 has a curved shape. As shown in FIG. 2, a part 85 of the annular surface 81 on the opposite side of the protruding portion 54 from the tubular portion 60 side hits the flange portion 66 over the entire circumference in the circumferential direction. A part 85 of the annular surface 81 forms a sliding portion of the protruding portion 54 and slides on the flange portion 66. Further, the distal end portion 87 of the protruding portion 54 is in contact with a portion (hereinafter, referred to as a second portion) 83 that is fixed to the cylindrical portion 60 of the base portion 53. The protrusion 54 has a portion 86 having a thickness smaller than the thickness of the protrusion 54 at the portion 85 of the annular surface 81 between the first portion and the portion 85 of the annular surface 81. . Further, the tip portion 87 is thinner than the thickness of the protruding portion 54 at a part 85 of the annular surface 81. Since the portion 86 and the tip portion 87 are easily elastically deformed, the contact surface pressure to the flange 66 of the portion 85 of the annular surface 81 is suppressed.

  The distal end portion 87 of the protruding portion 54 is located at a distance from the base portion 53 before being assembled to the slinger 52. As the protrusion 54 is assembled to the slinger 52, it receives an axial force from the flange 66 of the slinger 52 and deforms. The protruding portion 54 comes into contact with the second portion 83 in the assembled state due to deformation caused by the force from the flange portion 66.

  The axial lip 55 is located on the radially inner ring 4 (see FIG. 1) side of the protruding portion 54 (inward in the radial direction) with a radial distance from the protruding portion 54. The axial lip 55 has a first portion 91 and a second portion 92. The first portion 91 extends from the base 53 to the radially inner ring 4 side and the axially outer side. The second portion 92 is connected to the distal end of the first portion 91 on the outer side in the axial direction, and extends to the outer ring 2 side in the radial direction and the outer side in the axial direction.

  The second portion 92 of the axial lip 55 and the bent portion 94 of the first portion 91 and the second portion 92 of the axial lip 55 are elastic with the central axis of the rolling bearing device for the wheel as the center when assembled. By the relative rotation between the member 51 and the slinger 52, the slider 51 slides on the slinger 52.

  The radial lip 56 extends from the portion of the base 53 that is fixed to the radially inner end of the radially extending portion 61 to the radially inner side and the opposite side of the axial flange portion 66 side. Exist. The radial lip 56 slides on the outer peripheral surface of the cylindrical portion 65 of the slinger 52.

  In the space formed by the protrusion 54, the axial lip 55 and the slinger 52, the space surrounded by the axial lip 55 and the slinger 52, and the space surrounded by the axial lip 55, the radial lip 56 and the slinger 52 An appropriate amount of grease as a lubricant is enclosed or applied. The sliding portion between the protrusion 54 and the slinger 52, the sliding portion between the axial lip 55 and the slinger 52, and the sliding portion between the radial lip 56 and the slinger 52 are lubricated by the grease. Yes. In FIG. 2, grease as a lubricant is sealed in a ball arrangement chamber in which balls 18 and 19 located on the inner side in the axial direction (left side in FIG. 2) from the sealing device 9 are arranged.

  According to the sealing device 9 of the above-described embodiment, a part of the annular surface 81 (hereinafter referred to as the sliding portion) 85 on the opposite side of the cylindrical portion 60 side of the cored bar member 50 of the protruding portion 54 in the use state. The tip part 87 of the projecting part 54 is slid on the flange part 66 of the slinger 52 over the entire circumference in the circumferential direction, and the second part of the base part 53 (the cylindrical part 60 of the base part 53). The portion fixed to the inner peripheral surface) 83 is brought into contact. That is, according to the sealing device 9, since the center portion of the annular surface 81 of the projecting portion 54 hits the flange portion 66, sealing is performed. Compared with the configuration in which the tip end portion of the slidable member slides against the sliding member, the wear of the sliding portion 85 of the protruding portion 54 can be suppressed. Accordingly, the mud water resistance is unlikely to decrease.

  Further, according to the sealing device 9 of the above embodiment, since the central portion of the annular surface 85 of the protruding portion 54 hits the flange portion 66, the protruding portion is compared with the conventional per edge configuration. The 54 sliding portions 85 do not strongly press the flange portion 66. Therefore, torque can be suppressed.

  Further, according to the sealing device 9 of the above-described embodiment, the distal end portion 87 of the projecting portion 54 comes into contact with the second portion 83 fixed to the cylindrical portion 60 of the base portion 53 in the use state. Thus, the protruding portion 54 can be positioned in the use state. Therefore, the difference between the force at which the center portion of the annular surface 81 of the protrusion 54 presses the flange 66 and the desired force can be reduced, and the sealing performance of the sealing device 9 is close to the desired performance. Can do.

  Further, according to the sealing device 9 of the above-described embodiment, the tip end portion 87 of the protruding portion 54 comes into contact with the second portion 83 of the base portion 53 in the use state, and the protruding portion 54 is more radial. Since it covers a wide range, more foreign objects are repelled by the protrusions 54 than in the conventional configuration. Therefore, the mud water resistance of the sealing device 9 can be improved as compared with the conventional configuration.

  In the sealing device 9 of the above embodiment, the portion that is sealed is composed of the protruding portion 54, the axial lip 55, and the radial lip 56, but in this invention, the portion that is sealed is The protrusion and the one or more axial lips do not have to be present. Moreover, in this invention, the part which is sealing consists of a protrusion part and one or more radial lips, and the axial lip which contacts per edge does not need to exist. That is, in the present invention, any other sealing lip may be present as long as the elastic member has at least one protrusion, and the sealing lip may not be present.

  Further, in the sealing device 9 of the above embodiment, the sliding member is the slinger 52, and the protruding portion 54 hits the flange 66 of the slinger 52. However, in the present invention, the sealing device does not have to have a slinger, and in use, the protruding portion hits against the axial end surface of the outer ring, the inner ring, the intermediate ring, or the inner shaft. Also good. In this case, unlike the above-described embodiment, the sliding member is not fixed to the second track member, but the sliding member is the second track member itself, and the sliding member is Needless to say, it is included in the second track member.

  In the sealing device 9 of the above embodiment, the cored bar member 50 is fixed to the outer ring 2 that is a stationary member. However, in the present invention, the cored bar member may be fixed to the rotating member side.

  Moreover, in the sealing device 9 of the said embodiment, although both the metal core member 50 and the slinger 52 had the cross-sectional substantially L-shaped shape, in this invention, at least one of a metal core member and a slinger However, it does not have to be L-shaped in cross section.

  Further, in the sealing device 9 of the above-described embodiment, the distal end portion 87 of the protruding portion 54 is positioned at a distance from the second portion 83 of the base portion 53 before contacting the slinger 52. However, in this invention, before the protrusion comes into contact with the sliding member, the tip of the protrusion may be in contact with the portion fixed to the cylindrical portion of the core metal member of the base. .

  Further, in the wheel rolling bearing device of the above embodiment, the sealing device 9 of the first embodiment is connected to the other end side (the body mounting flange) in the axial direction of the rolling element (ball) arrangement chamber (lubricant enclosure chamber). However, in the present invention, the sealing device of the present invention may be disposed only on the brake disk mounting flange side in the axial direction of the rolling element arrangement chamber (lubricant enclosure chamber). . Moreover, in this invention, you may arrange | position the sealing apparatus of this invention in the vicinity of the opening of the both sides of the axial direction of a rolling element arrangement | positioning chamber (lubricant enclosure chamber). In the rolling bearing device for a wheel, the rolling element may be a roller instead of a ball, or may be both balls. The rolling element is a roller includes a case where the rolling element is a tapered roller, a case where it is a cylindrical roller, and a case where it is a convex roller, but when the rolling element is a roller, the rolling element is a cone. It is preferable that it is a roller. The 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 2 and is disposed on the side where the brake disk mounting flange 10 is not provided. Therefore, the slinger 50 can be easily attached to the inner ring 4 and the cored bar member 50 can be easily attached to the outer ring 2.

  FIG. 3 is an enlarged cross-sectional view around the sealing device 99 of the water pump of the second embodiment.

  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 device of a water pump. That is, although not shown, on the side indicated by the arrow a in FIG. 3 on the inner circumferential surface of the outer ring 105, a deep groove type raceway groove and a cylindrical raceway surface are provided in the axial direction with a space close to the sealing device 99. 3 is formed on the side of the outer peripheral surface of the pump shaft 100 indicated by the arrow a in FIG. 3 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 member 150 of the sealing device 99 is fitted and fixed to the inner peripheral surface of the outer ring 105 as the first race member, while the slinger 152 of the seal device 99 is a pump shaft as the second race member. The outer peripheral surface of 100 is fitted and fixed. The elastic member 151 of the sealing device 99 is fixed to the cored bar member 150. The slinger 152 constitutes a sliding member. 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 way, 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 device.

  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. 3, reference numeral 111 denotes a rubber sleeve of the mechanical seal 101, and 110 denotes 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. 3, 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 device can be extended.

  In the above embodiment, the sealing device of the present invention is set to a rolling bearing device for a wheel or a water pump. However, the sealing device of the present invention may be arranged in a rolling bearing device in which the race members having raceway surfaces are the outer ring and the inner ring so as to seal at least one opening between the outer ring and the inner ring. In addition, the sealing device of the present invention may be installed in a rolling bearing device disposed between a rotor member and a stator member in a motor (in this specification, the rolling bearing device is a sealing device, Defined as a device having a rolling element and a raceway surface on which the rolling element rolls).

  In the rolling bearing device of the present invention, the first race member may be an integral member or a plurality of members, and the second race member may be an integral member or a plurality of members. It may be. In the rolling bearing device of the present invention, the rolling elements may be arranged in a single row, or the rolling elements may be arranged in two or more rows.

2,105 Outer ring 4 Inner ring 5 First ball 6 Second ball 9 Sealing device 50,150 Core metal member 51,151 Elastic member 52,152 Slinger 53 Base portion 54 Protruding portion 80 Adhering to the radially extending portion of the base portion 81 The annular surface on the opposite side of the cylindrical portion of the core metal member of the protruding portion 83 The portion fixed to the cylindrical portion of the core metal member of the base portion 85 The sliding portion of the annular surface of the protruding portion 87 of the protruding portion Tip 99 Sealing device 100 Pump shaft

Claims (2)

A cored bar member having a cylindrical part and an annular radial extending part extending from the cylindrical part in a substantially radial direction of the cylindrical part;
An elastic member fixed to the core member,
The elastic member is
An annular and integral base fixed to the peripheral surface and the end surface so as to cover the peripheral surface of the cylindrical portion of the core member and the axial end surface of the radially extending portion;
An annular projecting portion projecting from the portion fixed to the radially extending portion of the base portion toward the tubular portion;
In use, a part of the annular surface of the protrusion opposite to the cylindrical part is slid on the sliding member, and the tip of the protrusion is A sealing device characterized by being in contact with a portion fixed to the cylindrical portion. A sealing device according to claim 1;
A first race member having a circumferential surface to which the cylindrical portion is fixed, and a raceway surface;
A second track member that includes the slide member or that has the track surface fixed to the slide member;
A rolling bearing device comprising: a rolling element disposed between the raceway surface of the first raceway member and the raceway surface of the second raceway member.

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