JP2010025138A - Sealing arrangement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure capable of preventing mud water or the like from intruding a sliding part S<SB>1</SB>of an anti-oil seal lip 13 as much as possible, in a sealing device 1 for sealing a shaft circumference or the like which is a section easily exposed to the mud water or the like form the outside. <P>SOLUTION: This sealing device is provided with an oil seal 10 attached to an inner circumference surface of an opening end 2a of a non-rotating housing 2, a slinger 20 attached to a rotation body 5 inserted to the housing 2 axially outside the oil seal 10 and an outer diameter flange 11a attached to the housing 2 at a position at the outer diameter side of the oil seal 10. The oil seal 10 has the anti-oil seal lip 13 slidably and closely contacting with an outer circumferential surface of the rotation body 5. In the outer diameter flange 11a, an outer diameter cylinder 11b extending toward an opposite side of an opening end 2a of the housing 2 from its outer diameter end is extended. Many fins 23a facing an inner circumferential surface of the outer diameter cylinder 11b are arranged at an outer diameter part of the slinger 20 with predetermined spaces between each other in a circumference direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a sealing device that seals a shaft periphery of a portion that is easily exposed to muddy water from the outside, such as a vehicle transfer device or a wheel bearing device, and particularly, muddy water or the like to a sliding portion of an oil seal lip. It is related with what is equipped with the structure which prevented intrusion.

  Sealing devices used in vehicle transfer devices, wheel bearing devices, etc., are easy for muddy water to fly from the outside. It is necessary to prevent the deterioration of the sealing performance at the lip as much as possible. FIG. 7 is a half sectional view of a mounting state in which an example of this type of sealing device according to the prior art is cut along a plane passing through the axis O.

  That is, in FIG. 7, reference numeral 2 is a housing of the transfer device, reference numeral 3 is a rotating shaft that is inserted through the housing 2 and supported around a shaft center O via a bearing 4, and reference numeral 5 is A sleeve that is spline-fitted to the outer periphery of the rotary shaft 3 and fixed by a nut 6, and a reference numeral 7 is a packing that seals between the rotary shaft 3 and the sleeve 5. A companion flange 5a formed at the end of the sleeve 5 is coupled to a propeller shaft (not shown) or the like.

  The sealing device 100 is located outside the bearing 4 in the axial direction and attached to the inner circumference of the housing 2, and the non-rotating oil seal 110 is located outside the oil seal 110 in the axial direction and attached to the outer circumference of the sleeve 5. And a slinger 120 that rotates together with the rotary shaft 3 and the sleeve 5.

  Specifically, the oil seal 110 includes an oil seal lip 111 extending toward the bearing 4 and a side lip 112 extending toward the opposite side (outside) of the oil seal lip 111. The oil seal lip 111 is slidably in close contact with the outer peripheral surface of the sleeve 5 to prevent leakage of the lubricating oil supplied to the bearing 4. The side lip 112 is a flange portion of the slinger 120. 121 is slidably brought into close contact with 121 to prevent muddy water or the like flying from the outside A from entering the oil seal lip 111 side, and the slinger 120 itself also has a centrifugal force generated in its flange portion 121. Further, the outer diameter portion 122 is brought close to the end portion of the housing 2 to improve the prevention effect against the intrusion of muddy water or the like (for example, see Patent Documents 1 to 3 below).

JP 2006-9930 A Japanese Utility Model Publication No. 5-54871 Japanese Utility Model Publication No. 3-67765

  However, according to the sealing device 100 as shown in FIG. 7 (Patent Documents 1 to 3), if the gap G between the outer diameter portion 122 of the slinger 120 and the outer peripheral surface of the end portion of the housing 2 is reduced, the machining tolerance and the rotating shaft 3 are reduced. Since the outer diameter portion 122 may come into contact with the outer peripheral surface of the end portion of the housing 2 due to the eccentricity of the above, it is difficult to make the gap G sufficiently small.

  The present invention has been made in view of the above points, and a technical problem thereof is an oil-sealing lip in a sealing device that seals a shaft periphery of a portion that is easily exposed to muddy water from the outside. The structure is such that muddy water or the like can be prevented from entering the sliding portion of the as much as possible.

  As a means for effectively solving the technical problem described above, a sealing device according to the invention of claim 1 includes an oil seal attached to the inner peripheral surface of the opening end portion of the non-rotating housing, and the rotation inserted through the housing. A slinger that is attached to a body and positioned outside the oil seal in the axial direction; and an outer diameter flange that is attached to the housing and located on the outer diameter side of the oil seal. An oil seal lip that is slidably brought into close contact with the outer peripheral surface, and an outer diameter cylindrical portion that extends from the outer diameter end portion to the opposite side of the opening end portion of the housing extends on the outer diameter flange. A plurality of fins facing the inner peripheral surface of the outer diameter cylindrical portion are provided at predetermined intervals in the circumferential direction on the outer diameter portion of the slinger.

  According to a second aspect of the present invention, there is provided a sealing device in which a dam portion which is located on the oil seal side of the fin described in the first aspect and is continuous in the circumferential direction is formed.

  According to a third aspect of the present invention, there is provided a sealing device, wherein the oil seal is attached to the inner peripheral surface of the opening end of the non-rotating housing, and is positioned on the outer side in the axial direction of the oil seal in the rotating body inserted through the housing. An oil-resistant seal comprising a slinger to be attached and an outer-diameter flange attached to the housing on the outer-diameter side of the oil seal, the oil seal being slidably in contact with the outer peripheral surface of the rotating body An outer diameter cylindrical portion extending from the outer diameter end portion of the outer diameter flange toward the opposite side of the opening end portion of the housing, and extending to the outer diameter portion of the slinger. A large number of fins are provided at predetermined intervals in the circumferential direction along the outer peripheral side of the cylindrical portion.

  According to a fourth aspect of the present invention, there is provided the sealing device according to the third aspect, wherein the slinger is continuously provided in the circumferential direction along the inner peripheral side of the outer diameter cylindrical portion extending from the outer diameter flange to the slinger. An annular protrusion is formed, and a labyrinth-like gap is formed between the annular protrusion and the outer diameter cylindrical portion.

  According to the sealing device of the first and third aspects of the present invention, a large number of fins provided at predetermined intervals in the circumferential direction on the outer diameter portion of the rotating slinger are provided with oil seals between the non-rotating outer diameter cylindrical portion. The muddy water that is about to enter the side is blown away to the outside, so that excellent sealing performance against mud water is obtained.

  Further, according to the sealing device of the second aspect of the present invention, the more excellent sealing performance against mud water can be obtained by the weir portion located on the oil seal side of the fin described in the first aspect.

  Further, according to the sealing device of the invention of claim 4, it is located on the inner peripheral side (oil seal side) from the fin described in claim 3 and is formed between the annular protrusion and the outer diameter cylindrical part. Due to the labyrinth-shaped gap formed, even better mud sealability is obtained.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a sealing device according to the present invention will be described with reference to the drawings. First, FIG. 1 is a half sectional view of a mounting state in which a preferred first embodiment of a sealing device according to the present invention is cut along a plane passing through an axis O, and FIG. 2 shows a main part of the first embodiment. It is a perspective view.

  In FIG. 1, reference numeral 2 is a non-rotating housing in a vehicle transfer device, reference numeral 3 is a rotating shaft that is inserted into the housing 2 and supported around a shaft center O via a bearing 4 so as to be rotatable. Reference numeral 5 denotes a sleeve that is positioned on the inner peripheral side of the opening end 2 a of the housing 2 and is extrapolated to the rotary shaft 3. The rotating shaft 3 and the sleeve 5 correspond to the rotating body described in claim 1.

  The sleeve 5 has a spline portion 5b formed on the inner peripheral surface of the sleeve 5 and a spline portion 3a formed on the outer peripheral surface of the rotary shaft 3, and is positioned on the outer side in the axial direction. A nut 6 screwed into a male screw portion 3 b formed on the outer peripheral surface is fixed in the axial direction in a state where the tip is in contact with the inner ring 4 a of the bearing 4. The rotary shaft 3 and the sleeve 5 are sealed by a packing 7 that is interposed on the axially outer side than the fitting portion of the spline portions 3 a and 5 b and is prevented from being detached by the nut 6. A companion flange 5a is formed at the outer end of the sleeve 5 and is coupled to a propeller shaft (not shown).

  Reference numeral 1 is a sealing device according to the first embodiment, and the oil seal 10 attached to the inner peripheral surface of the open end 2a of the housing 2 and the oil on the outer peripheral surface of the sleeve 5 extrapolated to the rotary shaft 3 And a slinger 20 mounted on the outer side in the axial direction of the seal 10.

  The oil seal 10 is formed integrally with a rubber-like elastic material on a reinforcing ring 11 produced by punching and molding a metal plate, for example, and is press-fitted to the inner peripheral surface of the open end 2a of the housing 2. An outer peripheral seal portion 12 to be attached, an oil seal lip 13 extending from the inner diameter position of the reinforcing ring 11 to the bearing 4 side, and an inner peripheral portion in the vicinity of the tip thereof being slidably in contact with the outer peripheral surface of the sleeve 5; A dust lip 14 extending from the inner diameter position of the reinforcing ring 11 to the side opposite to the oil seal lip 13 and having an inner periphery at the tip thereof closely contacted or slidable to the outer peripheral surface of the sleeve 5, and the root of the dust lip 14 And a side lip 15 extending in a conical cylindrical shape with a tip having a large diameter from the outer peripheral side to the oil seal lip 13. The oil seal lip 13 is fitted with a garter spring 16 that compensates for the tight force.

  An outer diameter flange 11 a and an outer diameter cylinder portion 11 b exposed from the outer peripheral seal portion 12 made of a synthetic resin material having rubber or rubber-like elasticity are extended to the outer diameter portion of the reinforcing ring 11 of the oil seal 10. Specifically, the outer diameter flange 11a of the reinforcing ring 11 extends to the outer diameter side along the tip of the opening end 2a of the housing 2, and faces the opposite side from the opening end 2a from the outer diameter end. A cylindrical outer diameter cylindrical portion 11b is extended. In other words, the outer diameter flange 11 a (and the outer diameter cylindrical portion 11 b) is attached to the housing 2 by being provided integrally with the reinforcing ring 11 of the oil seal 10.

  The slinger 20 is manufactured by punching and press-molding a metal plate. The inner cylinder portion 21 is press-fitted to the outer peripheral surface of the sleeve 5, and the inner cylinder portion 21 is formed in a disk shape in the outer diameter direction. It has a seal flange portion 22 that expands and is slidably brought into close contact with the front end portion of the side lip 15 of the oil seal 10.

  The outer diameter of the seal flange portion 22 of the slinger 20 is smaller than the outer diameter cylindrical portion 11b of the reinforcing ring 11, and an annular body 23 made of rubber or a synthetic resin material is provided at the outer diameter end of the seal flange portion 22. Are provided integrally. As shown in FIG. 2, the annular body 23 includes a large number of fins 23a protruding in the radial direction at predetermined intervals in the circumferential direction, the oil seal 10 side of the fins 23a (the outer diameter flange 11a side of the reinforcing ring 11). ) And a dam portion 23b that is continuous in the circumferential direction is formed. The outer diameters of the fins 23a and the dam portions 23b are close to and opposed to the inner peripheral surface of the outer diameter cylindrical portion 11b of the reinforcing ring 11, and the end surfaces of the dam portions 23b are close to the outer diameter flange 11a of the reinforcing ring 11 in the axial direction. Opposed.

  In the sealing device 1 according to the first embodiment configured as described above, the oil seal 10 press-fits the outer peripheral seal portion 12 in which the reinforcing ring 11 is embedded into the inner peripheral surface of the open end 2a of the housing 2, The outer diameter flange 11a of the reinforcing ring 11 is brought into contact with the tip of the opening end portion 2a to be positioned and fixed to the housing 2. On the other hand, the slinger 20 is positioned and fixed to the sleeve 5 by press-fitting the inner diameter cylindrical portion 21 to the outer peripheral surface of the sleeve 5 and contacting the stepped surface 5 c formed on the outer peripheral surface of the sleeve 5. After that, the sleeve 5 is extrapolated and fixed to the rotary shaft 3 to be in the illustrated mounting state.

The oil seal lip 13 of the oil seal 10 prevents the lubricating oil supplied to the bearing 4 from leaking from the outer periphery of the sleeve 5 to the outside A at the sliding portion S ₁ with the outer peripheral surface of the sleeve 5. is there. The side lip 15 of the oil seal 10, the sliding portion S ₂ of the sealing flange portion 22 of the rotating slinger 20, shaking of the sealing flange portion 22 by closely sliding and centrifugal force between the seal flange 22 acts The dust lip 14 of the oil seal 10 is in close proximity to or opposed to the outer peripheral surface of the sleeve 5 on the inner peripheral side of the side lip 15. By being in close contact with each other, infiltration of muddy water or the like into the oil seal lip 13 side is prevented.

Further, outside the sliding portions of the oil seal lip 13, the dust lip 14, and the side lip 15, a large number of fins 23 a of the annular body 23 that rotates together with the slinger 20 are formed on the outer diameter cylindrical portion of the non-rotating reinforcing ring 11. In order to blow off the muddy water and foreign matter to enter the side lip 15 side of the oil seal 10 from between 11b and the outside, the shielding effect against these muddy water and foreign matter is high, in addition to the inside Then, the damming action in the dam part 23b and the labyrinth sealing action in the labyrinth-like gap LG formed between the dam part 23b and the outer diameter cylinder part 11b and the outer diameter flange 11a are exhibited. Therefore, it is possible to effectively prevent the muddy water or the like flying from the outside A intrudes into the sliding portion S ₂ of the side lip 15.

  Further, in the labyrinth-shaped gap LG, the muddy water does not scatter due to the damming action and the labyrinth sealing action in the dam portion 23b. For this reason, the wear of the side lip 15 is also suppressed.

  In addition, the annular body 23 (fin 23a and dam portion 23b) that rotates together with the slinger 20 is not in contact with the outer diameter flange 11a and the outer diameter cylinder portion 11b of the non-rotating reinforcing ring 11, and thus generates sliding torque. There will be no reduction in fuel consumption.

  Next, FIG. 3 is a half sectional view showing a mounting state in which the second preferred embodiment of the sealing device according to the present invention is cut by a plane passing through the axis O, and FIG. 4 shows the main part of the second embodiment. It is a perspective view shown.

  In the second embodiment, the difference from the first embodiment described above is that the seal flange portion 22 of the slinger 20 extends to the outer diameter side of the front surface of the outer diameter cylindrical portion 11b of the reinforcing ring 11, and this An annular body 23 made of rubber or a synthetic resin material integrally provided in the vicinity of the outer diameter end portion of the seal flange portion 22 is arranged at predetermined intervals in the circumferential direction along the outer peripheral side of the outer diameter cylindrical portion 11b of the reinforcing ring 11. A plurality of fins 23a formed and an annular protrusion 23c continuous in the circumferential direction along the inner peripheral side of the outer diameter cylindrical portion 11b.

  The fins 23a and the annular protrusions 23c are not in contact with the outer diameter flange 11a and the outer diameter cylinder part 11b of the reinforcing ring 11, and are formed between the annular protrusions 23c and the outer diameter flange 11a and the outer diameter cylinder part 11b. A labyrinth-shaped gap LG having a zigzag cross-sectional shape cut by a plane passing through the axis O is formed therebetween. Other configurations are basically the same as those in FIG.

  According to the second embodiment configured as described above, the oil seal lip 13, the dust lip 14, the side lip 15 and the like of the oil seal 10 have the same functions as in the first embodiment.

Further, outside the sliding portions of the oil seal lip 13, the dust lip 14, and the side lip 15, a large number of fins 23 a of the annular body 23 that rotates together with the slinger 20 are formed on the outer diameter cylindrical portion of the non-rotating reinforcing ring 11. In order to blow off muddy water and foreign matter etc. to the outside on the outer peripheral side of 11b, in addition to having a high shielding effect against these muddy water and foreign matter etc., on the inner peripheral side (oil seal 10 side), an annular protrusion The labyrinth-shaped gap LG that is bent zigzag between the outer flange 23a and the outer-diameter flange 11a and the outer-diameter cylindrical portion 11b exhibits a labyrinth sealing action. Therefore, it is possible to effectively prevent muddy water or the like flying from the outside A from entering the sliding portion S ₂ of the side lip 15.

  Also in this second embodiment, the labyrinth gap LG does not cause muddy water to scatter due to the labyrinth sealing action, so that a vigorous stirring flow hardly occurs in the outer peripheral space B of the side lip 15. For this reason, the wear of the side lip 15 is also suppressed.

  Also in this second embodiment, the annular body 23 (fin 23a and annular projection 23c) that rotates together with the slinger 20 is not in contact with the outer diameter flange 11a and the outer diameter cylinder portion 11b of the non-rotating reinforcing ring 11. As a result, sliding torque is not generated and fuel consumption is not reduced.

  Next, FIG. 5 is a half sectional view showing a mounting state in which the third preferred embodiment of the sealing device according to the present invention is cut by a plane passing through the axis O, and FIG. 6 shows the main part of the third embodiment. It is a perspective view shown.

  In this third embodiment, the difference from the first embodiment described above is that the outer diameter end of the seal flange portion 22 of the slinger 20 is formed by press molding or machining, as shown in FIG. A large number of fins 24 projecting in the radial direction at predetermined intervals in the circumferential direction, and a weir portion 25 located on the oil seal 10 side (the outer diameter flange 11a side of the reinforcing ring 11) of the fins 24 and continuing in the circumferential direction are provided. It is in the formed point. The outer diameter of the fin 24 and the dam portion 25 is close to and opposed to the inner peripheral surface of the outer diameter cylindrical portion 11b of the reinforcing ring 11, and the end surface of the dam portion 25 is close to the outer diameter flange 11a of the reinforcing ring 11 in the axial direction. Opposed. Other configurations are basically the same as those in FIG.

  In the third embodiment configured as described above, the oil seal lip 13, the dust lip 14, the side lip 15 and the like of the oil seal 10 have the same functions as the first embodiment.

  Moreover, the fin 24 and the dam part 25 provided in the outer-diameter edge part of the seal flange part 22 of the slinger 20 also have the effect | action similar to the fin 23a and the dam part 23b in a 1st form.

  In addition, since the fin 24 and the dam portion 25 are formed on the seal flange portion 22 of the slinger 20 made of metal, the heat dissipation is good and the fin 24 and the dam portion 25 are formed when the slinger 20 is press-formed. Can be formed at the same time, so that the manufacturing cost can be kept low.

1 is a half cross-sectional view of a mounting state in which a preferred first embodiment of a sealing device according to the present invention is cut along a plane passing through an axis O. FIG. It is a perspective view which shows the principal part of a 1st form. FIG. 6 is a half cross-sectional view of a mounting state in which a second preferred embodiment of the sealing device according to the present invention is cut along a plane passing through an axis O. It is a perspective view which shows the principal part of a 2nd form. FIG. 6 is a half cross-sectional view of a mounting state in which a third preferred embodiment of the sealing device according to the present invention is shown cut by a plane passing through an axis O; It is a perspective view which shows the principal part of a 3rd form. FIG. 6 is a half cross-sectional view of a mounting state in which an example of a conventional sealing device is shown cut by a plane passing through an axis O;

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealing device 2 Housing 2a Open end 3 Rotating shaft (Rotating body)
5 Sleeve (Rotating body)
DESCRIPTION OF SYMBOLS 10 Oil seal 11 Reinforcement ring 11a Outer diameter flange 11b Outer diameter cylinder part 13 Oil seal lip 14 Dustrip 15 Side lip 20 Slinger 22 Seal flange part 23 Annular body 23a, 24 Fin 23b, 25 Weir part 23c Annular protrusion LG Labyrinth Gap

Claims (4)

  An oil seal attached to the inner peripheral surface of the opening end of the non-rotating housing, a slinger attached to a rotating body inserted through the housing and positioned on the outer side in the axial direction of the oil seal, and an outside of the oil seal on the housing An outer diameter flange mounted on the radial side, and the oil seal has an oil seal lip that is slidably in contact with the outer peripheral surface of the rotating body. An outer diameter cylindrical portion extending from the diameter end portion toward the opposite side of the opening end portion of the housing is extended, and a plurality of fins facing the inner peripheral surface of the outer diameter cylindrical portion are formed on the outer diameter portion of the slinger. A sealing device provided at predetermined intervals in the circumferential direction.   The sealing device according to claim 1, wherein a weir portion that is located on the oil seal side of the fin and is continuous in the circumferential direction is formed.   An oil seal attached to the inner peripheral surface of the opening end of the non-rotating housing, a slinger attached to a rotating body inserted through the housing and positioned on the outer side in the axial direction of the oil seal, and an outside of the oil seal on the housing An outer diameter flange mounted on the radial side, and the oil seal has an oil seal lip that is slidably in contact with the outer peripheral surface of the rotating body. An outer diameter cylindrical portion extending from the diameter end portion toward the opposite side of the opening end portion of the housing is extended, and a large number of fins are circularly formed on the outer diameter portion of the slinger along the outer peripheral side of the outer diameter cylindrical portion. A sealing device provided at predetermined intervals in the circumferential direction.   The slinger is provided with an annular protrusion that is continuous in the circumferential direction along the inner peripheral side of the outer diameter cylindrical portion that extends from the outer diameter flange, and the labyrinth is provided between the annular protrusion and the outer diameter cylindrical portion. The sealing device according to claim 3, wherein a gap is formed.

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