JP2008303907A - Sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve sealability in a sealing device for sealing by the swing action of a slinger 2. <P>SOLUTION: This sealing device comprises a stationary side sealing element 1 having a thrust lip 12 and a radial lip 13 on the inner peripheral side of the thrust lip and fitted to a stationary side member 101 and the slinger 2 formed of a sleeve 12 fitted to a rotating side member 102 and a flange 22 extending from one end of the sleeve. The thrust lip 12 is slidably fitted to the flange 22, and the radial lip 13 is slidably fitted to the outer peripheral surface of the sleeve 21. An annular groove 21a is formed in the inner peripheral surface of the sleeve 21 fitted to the rotating side member 101. A seal ring 3 made of a rubber-like elastic material interposed between the rotating side member 102 and itself is installed in the annular groove 21a. Consequently, leakage and entry of foreign matter through the very small gap at the fitting part between the sleeve 21 and the rotating side member 102 are surely prevented from occurring. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sealing device that prevents dust, muddy water, and the like from entering a bearing or the like in an automobile, a general machine, an industrial machine, etc., and performs sealing by swinging off a slinger.

  One type of sealing device that seals a bearing or the like has a slinger. FIG. 6 is a half sectional view showing a typical prior art of a sealing device of this type, cut along a plane passing through an axis O, and this sealing device is, for example, an inner ring (stationary side) of a bearing 100. A stationary-side sealing element 110 mounted on the periphery, and a metal slinger 120 including a sleeve 121 fitted on the outer periphery of the inner ring (rotation side) 102 of the bearing 100 and a flange 122 extending from one end thereof. A thrust strip 111 provided on the side sealing element 110 is slidably brought into close contact with the flange 122 of the slinger 120, and a radial lip 112 provided on the inner peripheral side of the thrust strip 111 is provided on the stationary sealing element 110. The slinger 120 is slidably in close contact with the outer peripheral surface of the sleeve 121. Reference numeral 113 denotes a grease lip for holding grease (not shown) that lubricates the interior of the bearing 100.

That is, this type of sealing device is configured to remove dust or dust from the outside A of the bearing by the swinging action by the centrifugal force of the flange 122 that rotates integrally with the inner ring 102 at the intimate sliding portion of the flange 122 of the slinger 120 and the thrust strip 111. It prevents intrusion of muddy water. Further, even if dust or muddy water slightly passes from the intimate sliding portion of the flange 122 and the thrust strip 111 to the inner peripheral side thereof, they are sealed in the intimate sliding portion of the sleeve 121 of the slinger 120 and the radial lip 112. Then, it is pushed back to the outer peripheral side of the thrust strip 111 by the swinging action by the centrifugal force of the flange 122 (see, for example, Patent Document 1).
JP 2004-18865 A

  However, in the conventional structure, since the sleeve 121 of the slinger 120 is in contact with the outer peripheral surface of the inner ring 102 with metal, external muddy water or the like is generated from a minute gap in the fitting portion between the sleeve 121 and the inner ring 102. There was a risk of entering the inside B of the bearing.

  The present invention has been made in view of the above points, and a technical problem thereof is to further improve the sealing performance in a sealing device that performs sealing by swinging off a slinger. .

  As a means for effectively solving the technical problem described above, a sealing device according to the invention of claim 1 includes a stationary side sealing element provided with a thrust strip and a radial lip on the inner peripheral side thereof and attached to the stationary side member. A sleeve fitted to the rotation side member and a slinger comprising a flange extending from one end thereof, the thrust strip being slidably in contact with the flange, and the radial lip being slidable on the outer peripheral surface of the sleeve An annular groove is formed in the inner peripheral surface of the sleeve fitted to the rotation side member, and a rubber-like elastic material interposed between the rotation side member and the annular groove. The seal ring which consists of is provided.

  According to a second aspect of the present invention, in the sealing device according to the first aspect, the outer peripheral side of the annular groove in the slinger sleeve is driven out on the flange side or the opposite side from the sliding portion with the radial lip. It is a ridge.

  According to the sealing device of the present invention, since the seal ring made of the rubber-like elastic material is interposed on the fitting surface between the rotating side member and the slinger sleeve, it is possible to pass through the minute gap in the fitting portion between the sleeve and the rotating side member. Leakage and entry of foreign objects are reliably prevented.

  In particular, when the annular groove is formed by plastic processing of the sleeve, and the outer peripheral side is a protruding portion that is driven out on the flange side from the sliding portion with the radial lip, this protruding portion is the slinger. It becomes a weir against foreign matter that has passed from the intimate sliding part of the flange and the thrust strip to the inner periphery, and this infiltrated material does not enter the radial lip side and moves to the outer periphery of the thrust strip by the swinging action of the flange. Since it is pushed back, the sealing performance is further improved.

  Moreover, when the outer peripheral side of the annular groove is a protruding portion that is driven out on the side opposite to the flange with respect to the sliding portion with the radial lip, the protruding portion is filled inside the sealing device. Since the function of retaining grease or the like can be provided, the sealing performance and the durability of the radial lip are further improved.

  FIG. 1 is a half sectional view showing a first embodiment of a sealing device according to the present invention by cutting along a plane passing through an axis O, and FIG. 2 is a sectional view showing the second embodiment cut along a plane passing through the axis O. FIG. The sealing device shown in FIGS. 1 and 2 includes a stationary-side sealing element 1 attached to the inner periphery of the outer ring 101 of the bearing 100 and a slinger 2 attached to the outer periphery of the inner ring 102 of the bearing 100. The outer ring 101 corresponds to a stationary member described in claim 1, and the inner ring 102 corresponds to a rotating member described in claim 1.

  The stationary-side sealing element 1 includes a metal mounting ring 11, a thrust strip 12, a radial lip 13, and a grease lip 14 integrally formed with the mounting ring 11 with a rubber-like elastic material. The mounting ring 11 is made of a metal plate, and has a cylindrical outer peripheral press-fitted portion 11a that is press-fitted to the inner peripheral surface of the outer ring 101 of the bearing 100, and a bearing inner B side of the outer peripheral press-fitted portion 11a. And an inward flange 11b extending inward from the end of the inner periphery. The thrust strip 12 has a large diameter from the base elastic layer 15 formed of a rubber-like elastic material to the bearing exterior A side of the inward flange 11b of the mounting ring 11 toward the bearing exterior A side. The radial lip 13 is located on the inner peripheral side of the thrust strip 12 and has a distal end from the inner peripheral end of the base elastic layer 15 toward the bearing exterior A side. The grease lip 14 is formed in a hook-like cross-sectional shape that is on the bearing inner B side of the radial lip 13 and is bent toward the bearing outer A side. ing.

  Further, a part of the base elastic layer 15 wraps around an outer peripheral portion of the outer peripheral press-fit portion 11 a of the mounting ring 11 facing the bearing outer A side, and an outer peripheral seal portion 16 that is in close contact with the inner peripheral surface of the outer ring 101. It has become.

  The slinger 2 is made of a metal plate, and expands in a disc shape from the sleeve 21 press-fitted to the outer peripheral surface of the inner ring 102 of the bearing 100 to the outer peripheral side from the end on the bearing outer A side. And a flange 22. The thrust strip 12 in the stationary side sealing element 1 is in close contact with the inner surface 22a of the flange 22 in the slinger 2 so that the entire circumference of the tip end portion is slidable, and the radial lip 13 is in contact with the outer peripheral surface of the sleeve 21 in the slinger 2. The entire periphery of the inner peripheral edge near the tip is slidably in close contact.

  An annular groove 21a is formed in the inner peripheral surface of the sleeve 21 in the slinger 2 by cutting, and a rubber-like elastic material interposed in the annular groove 21a between the outer peripheral surface of the inner ring 102 of the bearing 100 in an appropriately compressed state. A seal ring (for example, an O-ring) 3 is attached. Since the seal ring 3 has a thin wire diameter, a surface coated with a synthetic resin is preferably used in consideration of mounting properties and handling properties.

  In the first embodiment shown in FIG. 1, the annular groove 21 a in which the seal ring 3 is mounted is formed on the flange 22 side (outside of the bearing) of the sleeve 21 of the slinger 2 from the close sliding portion S <b> 2 with the radial lip 13. In the second embodiment shown in FIG. 2, it is located on the side opposite to the flange 22 (on the bearing B side) with respect to the close sliding portion S2 with the radial lip 13. Is formed.

  The sealing device configured as described above includes the flange 22 of the slinger 2 that rotates integrally with the inner ring 102 of the bearing 100, and the thrust strip 12 of the non-rotating stationary side sealing element 1 attached to the outer ring 101 of the bearing 100. In the intimate sliding portion S1, the intrusion of dust, muddy water, and the like flying from the outside of the bearing A is prevented by the action of swinging off the flange 22 by centrifugal force. Even if dust or muddy water or the like slightly passes from the intimate sliding portion S1 between the flange 22 and the thrust strip 12 to the inner peripheral side thereof, these are intimately sliding portions between the sleeve 21 of the slinger 2 and the radial lip 13. Since it is sealed in S2, it cannot enter the bearing interior B, and is eventually pushed back to the outer peripheral side of the thrust strip 12 by the swinging action of the flange 22 due to the centrifugal force.

  On the other hand, the outer ring 101 of the bearing 100 and the outer peripheral press-fitted portion 11a of the mounting ring 11 of the stationary side sealing element 1 attached to the inner peripheral surface thereof by press-fitting are formed integrally with the outer peripheral press-fitted portion 11a. The outer peripheral seal portion 16 is sealed by being in close contact with the inner peripheral surface of the outer ring 101, and between the inner ring 102 of the bearing 100 and the sleeve 21 of the slinger 2 attached to the outer peripheral surface by press-fitting, The sleeve 21 is sealed by a seal ring 3 mounted in the annular groove 21a. For this reason, external muddy water or the like enters the inside B of the bearing through a minute gap in the fitting portion between the outer ring 101 and the outer peripheral press-fit portion 11a of the mounting ring 11 or a minute gap in the fitting portion between the sleeve 21 and the inner ring 102. Can be effectively prevented.

  The bearing B is filled with grease for lubricating the bearing 100, and this grease also has a function of lubricating the sleeve 21 of the slinger 2 and the close sliding portion S <b> 2 of the radial lip 13. A part of this grease also intervenes in the fitting portion between the sleeve 21 and the inner ring 102, but according to the embodiment shown in FIG. 2, the annular groove 21a in which the seal ring 3 is mounted has a radial lip. Since it is located on the bearing inner side B from the 13 intimately sliding portions S2, the grease intervening region can be suppressed to a narrow range, and the slinger 2 can be prevented from slipping.

  Next, FIG. 3 is a half sectional view showing a third embodiment of the sealing device according to the present invention by cutting along a plane passing through the axis O. In the sealing device of this embodiment, the difference from the first or second embodiment described above is that the annular groove 21a in which the seal ring 3 is mounted bends the sleeve 21 of the slinger 2 from the inner peripheral side to the outer peripheral side. The point is formed by plastic working. For this reason, on the outer peripheral surface of the sleeve 21, a ridge portion 21 b is formed at a portion corresponding to the outer peripheral side of the annular groove 21 a, and this ridge portion 21 b is formed from a close sliding portion S 2 with the radial lip 13. It is located on the flange 22 side (bearing exterior A side). The other parts are basically configured in the same manner as in FIG.

  According to this embodiment, in addition to the same effects as those of the first or second embodiment described above, the following effects can also be expected. That is, even if dust or muddy water flying from the outside A of the bearing slightly passes from the close sliding portion S1 between the flange 22 and the thrust strip 12 to the inner peripheral side, Before reaching the close sliding portion S2 between the sleeve 21 of the slinger 2 and the radial lip 13, the rib 21b is dammed, so that it is pushed back to the outer peripheral side of the thrust strip 12 by the swinging action by the centrifugal force of the flange 22. . Therefore, since dust, muddy water or the like does not intervene in the close sliding portion S2 between the sleeve 21 of the slinger 2 and the radial lip 13, the seal durability is improved.

  Next, FIG. 4 is a half sectional view showing a fourth embodiment of the sealing device according to the present invention by cutting along a plane passing through the axis O. The sealing device of this form is also formed by plastic processing so that the annular groove 21a bends the sleeve 21 of the slinger 2 from the inner peripheral side to the outer peripheral side, as in the third embodiment. On the outer peripheral surface of 21, a ridge 21 b is formed at a portion corresponding to the outer peripheral side of the annular groove 21 a, and this ridge 21 b (annular groove 21 a) is in close contact with the radial lip 13. It is located on the side opposite to the flange 22 (on the bearing inner side B) as viewed from S2. The other parts are basically configured in the same manner as in FIG.

  According to this embodiment, in addition to the same effects as those of the first or second embodiment described above, the following effects can also be expected. That is, the grease G present in the bearing interior B is favorably held on the back surface portion of the thrust strip 12 by the grease lip 14 and the protrusion 21b located on the bearing interior B side from the close sliding portion S2. Therefore, the intimate sliding portion S2 of the thrust strip 12 is maintained in a good lubricating state, and an improvement in durability can be expected.

  Further, since the protruding portion 21b has a function of preventing the thrust strip 12 from coming off, the stationary-side sealing element 1 and the slinger 2 can be temporarily assembled before being incorporated into the bearing 100. 12 and the radial lip 13 can be prevented from being damaged and can be handled easily.

  By the way, this type of sealing device includes a magnetic rotary encoder for detecting the rotational speed and rotation angle of the shaft, but the present invention can also be applied to such a sealing device. it can. FIG. 5 is a half sectional view showing a fifth embodiment in which the present invention is applied to a sealing device with a magnetic encoder, cut along a plane passing through an axis O. FIG.

  In other words, in this embodiment, the pulsar ring 4 is integrally provided on the outer surface of the flange 22 of the slinger 2 and is made of magnetic rubber and is multipolarly magnetized at a predetermined pitch in the circumferential direction. Magnetic rubber is a mixture of rubber-like elastic material and fine powder of magnetic material. In addition, a magnetic sensor 5 is opposed to the outside of the pulsar ring 4 in a non-rotating state, and this magnetic sensor 5 constitutes a rotary encoder together with the pulsar ring 4. A pulse having a waveform corresponding to a change in the magnetic field caused by rotating integrally with the inner ring 102 is generated to detect the rotation.

  That is, in this embodiment, the magnetic encoder is configured by providing the pulsar ring 4 on the sleeve 21 of the slinger 2 in the third embodiment shown in FIG. 3, but is shown in FIG. 1, FIG. 2, or FIG. Other forms can be configured in the same manner.

1 is a half sectional view showing a first embodiment of a sealing device according to the present invention by cutting along a plane passing through an axis O. FIG. FIG. 5 is a half sectional view showing a second embodiment of the sealing device according to the present invention by cutting along a plane passing through an axis O; FIG. 5 is a half sectional view showing a third embodiment of the sealing device according to the present invention by cutting along a plane passing through an axis O; FIG. 6 is a half cross-sectional view showing a fourth embodiment of the sealing device according to the present invention by cutting along a plane passing through an axis O; FIG. 6 is a half sectional view showing a fifth embodiment of the sealing device according to the present invention by cutting along a plane passing through an axis O; 1 is a half sectional view showing a typical prior art of a sealing device by cutting along a plane passing through an axis.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Static side sealing element 11 Mounting ring 12 Thrust strip 13 Radial lip 14 Grease lip 2 Slinger 21 Sleeve 21a Annular groove 21b Projection part 22 Flange 3 Seal ring 4 Pulsar ring 5 Magnetic sensor 100 Bearing 101 Outer ring (static side member)
102 Inner ring (rotary member)

Claims (2)

  A thrust side strip provided with a radial lip on the inner peripheral side of the thrust strip and attached to the stationary side member; and a slinger comprising a sleeve fitted to the rotary side member and a flange extending from one end of the sleeve. In a sealing device in which the radial lip is slidably in contact with the outer peripheral surface of the sleeve, and an annular groove is formed in the inner peripheral surface of the sleeve fitted to the rotating side member. And a seal ring made of a rubber-like elastic material interposed between the annular member and the rotary member.   The sealing device according to claim 1, wherein the outer peripheral side of the annular groove in the sleeve of the slinger is a protruding portion that is driven out on the flange side or the opposite side from the sliding portion with the radial lip.

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