JP2020034053A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a sealing device capable of suppressing the infiltration of muddy water into a sliding portion of a seal. A wheel provided with an inner shaft 3 and an outer ring 2 arranged concentrically, and a flange 8 having a side surface facing the axial end surface of the outer ring with a gap is provided at the end of the inner shaft. Sealing device used for rolling bearing equipment. A slinger 20 that is fitted and fixed to the end of the inner shaft and extends radially outward along the side surface of the flange, a core metal 30 that is fitted and fixed to the outer peripheral surface of the end of the outer ring, and fixed to the core metal. It is provided with a deflector 42 provided on the outer diameter portion of the core metal and a seal member 40 having a seal lip 45 that is in sliding contact with the slinger. The seal member is provided radially inward of the deflector and has a protruding portion 43 projecting radially outward and in a direction approaching the slinger. A gutter structure C that opens radially outward is formed by the deflector and the protrusion, and a labyrinth structure is formed between the tip of the protrusion that constitutes one peripheral wall of the gutter structure C and the slinger. .. [Selection diagram] Fig. 2

Description

  The invention relates to a sealing device. More specifically, the present invention relates to a sealing device used for a rolling bearing device for a wheel.

BACKGROUND ART A rolling bearing device for a wheel mounted on a vehicle such as an automobile and rotatably supporting a wheel includes a radially inner inner shaft and a radially outer outer ring concentrically arranged. For example, the inner shaft can be rotated with respect to the outer ring by a rolling element (a ball or a tapered roller) interposed therebetween. A radially outwardly extending flange is provided at an axial end of the inner shaft, and a wheel and a brake disc are attached to the flange.

  In such a rolling bearing device for a wheel, in order to prevent foreign matter such as muddy water from entering the annular space formed between the inner shaft and the outer ring and in which the rolling elements are disposed, both ends in the axial direction of the annular space are prevented. The part is equipped with a sealing device.

As shown in FIG. 3, as a sealing device 110 mounted on an axially outer end of the annular space at both ends in the axial direction, as shown in FIG. One provided with a slinger 120 extending radially outward along the side surface 106a, a metal core 130 fitted to the end outer peripheral surface 102a of the outer ring 102, and a seal member 140 fixed to the metal core 130 (For example, see Patent Document 1). The sealing member 140 in the sealing device 110 described in Patent Document 1 is made of an elastic material and has a plurality of sealing lips 142a, 142b, 142c. These seal lips 142 a, 142 b, 142 c constitute a seal sliding portion that slides on the slinger 120.

  The sealing device 110 shown in FIG. 3 has a gutter-shaped cover lip 144 radially outward of the seal lips 142a, 142b, and 142c, and is located inside the cover lip 144 in the axial direction of the vehicle. An annular groove 141a is formed in the cylindrical portion 141 of the seal member 140.

  In the sealing device 110, the muddy water that has entered the gap S between the end of the outer ring 102 and the flange 106 is guided downward along the cover lip 144 to drop, and the muddy water that has adhered to the cylindrical portion 141 is removed by the annular groove. By guiding and falling down along 141a, muddy water can be suppressed from entering the seal sliding portion radially inward of the cover lip 144.

JP-A-2006-80141

  However, when the amount of muddy water entering the gap S increases due to, for example, a vehicle traveling on a road with a lot of puddles, the above-described cover lip 144 and the annular groove 141a sufficiently suppress the infiltration of the muddy water into the seal sliding portion. You may not be able to.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a sealing device that can improve the effect of suppressing muddy water from entering a seal sliding portion.

The sealing device of the present invention,
(1) Rolling for a wheel including an inner shaft and an outer ring arranged concentrically, and a flange having a side surface opposed to the axial direction end surface of the outer ring with a gap provided at an end of the inner shaft. A sealing device that is used for a bearing device and that prevents muddy water from entering an annular space between the inner shaft and the outer ring,
A slinger fitted and fixed to an end of the inner shaft and extending radially outward along a side surface of the flange;
A core bar fitted and fixed to an end outer peripheral surface of the outer ring,
A seal member fixed to the cored bar and having a deflector provided on an outer diameter portion of the cored bar and a seal lip slidingly contacting the slinger;
The seal member is provided radially inward of the deflector, and further includes a protruding portion that protrudes radially outward and in a direction approaching the slinger.
A gutter structure that opens radially outward is formed by the deflector and the protruding portion, and a labyrinth structure is provided between the leading end of the protruding portion and the slinger that constitute one peripheral wall of the gutter structure. Is formed.

  In the sealing device of the present invention, the protrusion is provided radially inward of the deflector of the seal member. The protruding portion protrudes radially outward and in a direction approaching the slinger, and a gutter structure that opens radially outward is formed by the protruding portion and the deflector. Thereby, since the muddy water that has entered from the outside is guided downward by the gutter structure and falls, it is possible to suppress the muddy water from entering the seal lip constituting the seal sliding portion. In addition, since a labyrinth structure is formed between the tip of the protrusion forming one of the peripheral walls of the gutter structure and the slinger, the amount of muddy water entering the gutter structure increases, and a part of the muddy water enters the peripheral wall. Even if the water overflows along the gutter structure, the labyrinth structure can prevent infiltration of muddy water into the seal lip.

(2) In the sealing device according to the above (1), it is preferable that an outermost diameter portion of the slinger facing the gutter structure is a diameter-expanded portion that is continuously enlarged toward a tip end. In this case, the outermost diameter portion of the slinger facing the gutter structure (the portion of the slinger that is located most radially outward) is an enlarged diameter portion, and is guided downward by the gutter structure to be guided by the outermost diameter. Mud water that has fallen into the part can be easily discharged to the outside. Further, the muddy water can be easily shaken off when the inner shaft rotates.

  ADVANTAGE OF THE INVENTION According to the sealing device of this invention, the muddy water intrusion suppression effect to a seal sliding part can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing of the rolling bearing device for wheels with which the sealing device which concerns on one Embodiment of this invention is mounted. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional explanatory drawing of the sealing device which concerns on one Embodiment of this invention. It is sectional explanatory drawing of an example of the conventional sealing device.

Hereinafter, embodiments of the sealing device of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the present invention is not limited to these exemplifications, but is indicated by the appended claims, and is intended to include all modifications within the meaning and scope equivalent to the appended claims.
FIG. 1 is an explanatory cross-sectional view of a rolling bearing device 1 for a wheel using a sealing device 10 according to an embodiment of the present invention, and FIG. 2 is an explanatory cross-sectional view of the sealing device 10 in FIG. In FIG. 2, the outer ring 2 and the inner shaft 3 (the flange 8 and the shaft main body 6) are indicated by two-dot chain lines for easy understanding.

[Rolling bearing device 1 for wheels]
As shown in FIG. 1, a rolling bearing device 1 for a wheel (hereinafter, also simply referred to as a “bearing device”) rotatably supports a wheel with respect to a suspension device 50 provided on a vehicle body of an automobile. A radially outer ring 2 and a radially inner shaft 3.

The outer ring 2 is a cylindrical member, and is fixed to a suspension device 50 on the vehicle body side.
The inner shaft 3 has a shaft main body 6 and an annular inner ring member 7 which is fixed to the end of the shaft main body 6 on the inner side (left side in FIG. 1) A1 of the vehicle. Between the outer race 2 and the inner shaft 3, there are two rows and a plurality of balls (rolling elements) 4 are interposed in each row. The outer ring 2 and the inner shaft 3 are arranged concentrically, and in the present embodiment, the inner shaft 3 is rotatable with respect to the outer ring 2. Further, the bearing device 1 includes a retainer 5 that retains the plurality of balls 4.

  Sealing devices 10 and 60 are mounted between both ends of the outer ring 2 in the axial direction and the inner shaft 3. These sealing devices 10 and 60 prevent foreign matters such as muddy water from entering the annular space 9 formed between the outer ring 2 and the inner shaft 3 from the radial outside of the outer ring 2. The sealing device according to the following embodiment is used as the sealing device 10 on the outside A2 of the vehicle (right side in FIG. 1) among the sealing devices 10 and 60.

[Sealing device 10]
As shown in FIG. 2, the sealing device 10 includes a slinger 20 fitted and fixed to an end of the inner shaft 3, a core 30 fitted and fixed to an end of the outer race 2, and And a sealing member 40 to be fixed. Note that the sealing device 10 shown in FIG. 2 shows a natural state before deformation before being mounted on the bearing device 1. Further, in this specification, a direction facing the outside of the vehicle (right direction in FIG. 2) is also referred to as an axially outward direction, and a direction facing the inside of the vehicle (left direction in FIG. 2) is also referred to as an axial inward direction.

[Slinger 20]
The slinger 20 is a member formed in an annular shape by pressing a metal such as stainless steel. The slinger 20 is a first cylindrical portion 21 fitted and fixed to an outer peripheral surface 3 a of an end portion of the inner shaft 3 on the outer side in the axial direction and an inner side of the flange 8 in the axial direction. A first annular portion 22 extending radially outward from an axially outward end of the cylindrical portion 21 along an axially inward side surface 8a of the flange 8, and an outer periphery of the first annular portion 22; A second cylindrical portion 23 extending inward in the axial direction from the end, a second annular portion 24 extending radially outward from an axially inward end of the second cylindrical portion 23, and a second annular portion And an enlarged diameter portion 25 extending inward in the axial direction and outward in the radial direction from the outer peripheral end of the portion 24. The enlarged diameter portion 25 is a portion of the slinger 20 that is positioned most radially outward, and is disposed at a position substantially facing the gutter structure described later in the radial direction. The enlarged diameter portion 25 is a portion whose diameter is continuously increased toward the front end.

[Core metal 30]
The core metal 30 is a member formed in an annular shape by pressing a steel plate such as SPCC. The metal core 30 has a cylindrical portion 31 fitted and fixed to the outer peripheral surface 2 a at the axially outer end of the outer ring 2, and radially inward from the axially outer end of the cylindrical portion 31. A first annular portion 32 extending in close contact with the axially outward end surface 2b of the outer ring 2; and a radially inward and radially inward portion from a radially inward end of the first annular portion 32. And a second annular portion 34 extending radially inward from a radially inner end of the inclined portion 33. On the inner peripheral surface of the axially inner end of the cylindrical portion 31, an annular concave portion 31a which is concave radially outward is formed.

[Seal member 40]
The seal member 40 is formed by forming an elastic material such as nitrile rubber into an annular shape, and is vulcanized and bonded to the core metal 30. The seal member 40 has a seal body 41 fixed to the core 30, a deflector 42 formed integrally with the seal body 41, a protrusion 43, a cover lip 44, a seal lip 45, and an auxiliary lip 46. .

  The seal main body 41 is an annular member as a whole, and includes a seal cylindrical portion 41a, a first seal annular portion 41b, a seal inclined portion 41c, and a second seal annular portion 41d. The seal cylindrical portion 41a is fixed along the outer peripheral surface 31b of the cylindrical portion 31 of the metal core 30. The axially inward end of the seal cylindrical portion 41a is formed so as to be folded back from the axially inward end of the cylindrical portion 31 of the cored bar 30 toward the recessed portion 31a. Close. The first seal annular portion 41b is formed to extend radially inward from the axially outer end of the seal cylindrical portion 41a, and extends outward in the axial direction of the first annular portion 32 of the metal core 30. It is fixed along the side surface 32a.

The seal inclined portion 41c is formed to extend axially outward and radially inward from the radially inner end of the first seal annular portion 41b, and is formed in the radial direction of the inclined portion 33 of the cored bar 30. It is fixed along the outer surface 33a. The second seal annular portion 41d is formed to extend radially inward from the radially inward end of the seal inclined portion 41c, and extends axially outward of the second annular portion 34 of the cored bar 30. It is fixed along the side surface 34a. The radially inner end of the second seal annular portion 41d is axially inward of the second annular portion 34 from the radially inner end of the second annular portion 34 of the metal core 30. It is formed so as to be folded back to the side surface 34b side.

The deflector 42 is a member formed radially outside the seal cylindrical portion 41a of the seal body 41, and is formed in a cylindrical shape having a thickness of about several millimeters. The muddy water flowing on the outer peripheral surface 2a of the outer ring 2 toward the side surface 8a of the flange 8 is blocked by the axial end surface 42a of the deflector 42 and flows downward along the outer peripheral surface 2a of the outer ring 2. In addition, muddy water can be prevented from entering the gap between the outer ring 2 and the flange 8.

The protrusion 43 is provided radially inward of the deflector 42 and axially outward thereof. The protruding portion 43 is provided so as to extend or protrude radially outward and axially outward from the axially outer end of the seal cylindrical portion 41a. The portion of the seal cylindrical portion 41a located on the outer side in the axial direction from the deflector 42, including the portion where the projecting portion 43 is provided, is substantially radially opposed to the enlarged diameter portion 25 which is the outermost diameter portion of the slinger 20. In a positional relationship. The protruding portion 43 protrudes in a direction approaching a portion 25 a of the enlarged diameter portion 25 of the slinger 20 near the boundary with the second annular portion 24.

In the present embodiment, an annular gutter structure C that opens radially outward is formed by the protruding portion 43 and the deflector 42. The protruding portion 43 forms a peripheral wall on the axially outward side of the gutter structure C. The radial end of the protruding portion 43 is an annular distal end surface 43a, and the distal end surface 43a radially opposes a radially inner surface 25b of the enlarged diameter portion 25 of the slinger 20. The gap s1 between the tip surface 43a and the surface 25b is set to be about 0.1 to 0.6 mm. The axially outer end surface 43b of the protrusion 43 is opposed to the axially inner surface 24a of the second annular portion 24 of the slinger 20 in the axial direction. The gap s2 between the end face 43b and the face 24a is set to be about 0.5 to 0.9 mm. As described above, in the present embodiment, the labyrinth structure is formed by the gaps s1 and s2 provided between the protrusion 43 and the slinger 20.

The depth d of the gutter of the gutter structure C is not particularly limited, but may be, for example, 0.1 to 1.0 mm. In the present embodiment, in order to improve the mold releasability of the mold at the time of forming the gutter structure C, the surface 43c on the inner side in the axial direction of the projection 43 is formed as an inclined surface, and the surface 43c of the deflector 42 is The surface 42b of the root portion on the side is also an inclined surface. The surface 43c is a surface that inclines outward in the axial direction as it goes radially outward, and the surface 42b is a surface that inclines inward in the axial direction as it goes radially outward.

The cover lip 44 is formed integrally with the seal inclined portion 41c of the seal body 41 between the seal lip 45 and the projecting portion 43. The cover lip 44 has a gutter shape that opens radially outward in a sectional view. Is formed.

The seal lip 45 is formed integrally with the second seal annular portion 41 d of the seal body 41 inside the cover lip 44 in the radial direction. The seal lip 45 is formed to extend axially outward and radially outward from the second seal annular portion 41d. The distal end of the seal lip 45 is in sliding contact with the first annular portion 22 of the slinger 20 in a state where the seal lip 45 is mounted on the bearing device 1, thereby suppressing entry of foreign matter such as muddy water into the bearing device 1. It has the function to do.

The auxiliary lip 46 is provided radially inward and axially inward of the seal lip 45. The auxiliary lip 46 is formed integrally with the second seal annular portion 41d of the seal body 41, and is formed so as to extend axially inward and radially inward from the second seal annular portion 41d. . The auxiliary lip 46 has a function of preventing grease inside the bearing from leaking to the outside.

The sealing device 10 according to the present embodiment is provided with the protrusion 43 as described above, and the protrusion 43 and the deflector 42 form a gutter structure C that opens radially outward. Thus, even if muddy water enters from the gap s3 between the tip of the enlarged diameter portion 25 of the slinger 20 and the deflector 42, the muddy water is received by the gutter structure C and guided downward along the gutter structure C. Can be dropped. As a result, muddy water can be suppressed from entering radially inward of the gutter structure C. More specifically, it is possible to suppress the intrusion of muddy water into the seal lip 45 constituting the seal sliding portion radially inward of the gutter structure C.

On the other hand, even if the amount of muddy water entering from the gap s3 increases and a part thereof overflows from the gutter structure C along the surface 43c of the protrusion 43, the protrusion 43 constituting one peripheral wall of the gutter structure C is formed. As described above, a labyrinth structure including the gap s1 and the gap s2 is formed between the tip end of the slinger 20 and the slinger 20, so that the labyrinth structure prevents infiltration of muddy water into the seal lip 45. it can.

In the present embodiment, a gutter-shaped cover lip 44 is provided between the gutter structure C and the seal lip 45. For this reason, even if muddy water invades radially inward through the above-mentioned labyrinth structure, the muddy water can be received by the cover lip 44 and guided downward along the cover lip 44 to be dropped. Thereby, it can suppress that muddy water infiltrates into seal lip 45 which constitutes a seal sliding part.

In the present embodiment, the outermost diameter portion of the slinger 20 facing the gutter structure C is an enlarged diameter portion 25 that is continuously increased in diameter toward the tip. Thereby, the muddy water that has been guided downward by the gutter structure C and that has fallen on the enlarged diameter portion 25 can be easily discharged to the outside. Further, when the inner shaft 3 rotates, the muddy water can be easily shaken off.

[Other modifications]
The present disclosure is not limited to the embodiments described above, and various modifications can be made within the scope of the claims.
For example, in the embodiment described above, the number of the seal lips sliding on the slinger is one, but the number is not particularly limited in the present invention, and may be two or more.

In the above-described embodiment, the cover lip is provided between the gutter structure and the seal lip, but the cover lip may be omitted.
In the above-described embodiment, a ball is used as a rolling element of the bearing device. However, a rolling element such as a tapered roller may be used.

1: Bearing device 2: Outer ring 3: Inner shaft 4: Ball (rolling element)
5: Cage 6: Shaft main body 6a: Outer peripheral surface 8: Flange 9: Annular space 10: Sealing device 20: Slinger 21: First cylindrical portion 22: First annular portion 23: Second cylindrical portion 24: Second Annular part 25: Expanded diameter part 30: Core metal 31: Cylindrical part 31a: Depressed part 31b: Outer peripheral surface 32: First annular part 33: Inclined part 34: Second annular part 40: Seal member 41: Seal body 41a: seal cylinder 41b: first seal annular portion 41c: seal inclined portion 41d: second seal annular portion 42: deflector 42a: end surface 43: projecting portion 44: cover lip 45: seal lip 46: auxiliary lip C: gutter Structure s1: Gap s2: Gap s3: Gap

Claims (2)

A wheel rolling bearing device comprising a concentrically disposed inner shaft and an outer ring, and a flange having a side surface facing the gap with an axial end surface of the outer ring provided at an end of the inner shaft. Used, a sealing device for preventing muddy water from entering the annular space between the inner shaft and the outer ring,
A slinger fitted and fixed to an end of the inner shaft and extending radially outward along a side surface of the flange;
A core bar fitted and fixed to an end outer peripheral surface of the outer ring,
A seal member fixed to the cored bar and having a deflector provided on an outer diameter portion of the cored bar and a seal lip slidingly contacting the slinger;
The seal member is provided radially inward of the deflector, and further includes a protruding portion that protrudes radially outward and in a direction approaching the slinger.
A gutter structure that opens radially outward is formed by the deflector and the protruding portion, and a labyrinth structure is provided between the leading end of the protruding portion and the slinger that constitute one peripheral wall of the gutter structure. A sealing device, wherein a sealing member is formed. The sealing device according to claim 1, wherein an outermost diameter portion of the slinger facing the gutter structure is an enlarged diameter portion that is continuously enlarged toward a tip.

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