JP2019138400A - Sealing device - Google Patents

Abstract

To inhibit a seal member and a slinger from significantly moving close to each other in an axial direction in a state where a sealing device is stored.SOLUTION: A sealing device 15 includes: a seal member 31; and a slinger 32 which is providing facing the seal member 31. The slinger 32 has a seal surface 53 facing in an axial direction. The seal member 31 has: lips 38, 39 which are provided extending to the seal surface 53 side; and a support part 41. The support part 41 has higher rigidity against an axial load than the lips 38, 39 and contacts with a part of the slinger 32 to prevent interferences of the lips 38, 39 contacting with the seal surface 53 from becoming large when the seal member 31 and the slinger 32 move close to each other in the axial direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sealing device.

  Sealing devices are used in various devices. For example, a sealing device is used for a wheel bearing device (hub unit) for supporting a wheel in a vehicle such as an automobile. The wheel bearing device includes an outer ring member, an inner shaft member, and a plurality of rolling elements disposed between the outer ring member and the inner shaft member. The sealing device is provided between the axial end of the outer ring member and the inner shaft member, and prevents foreign matter such as muddy water from entering the bearing in which the rolling elements are provided.

  In the case of the wheel bearing device, the vehicle inner side sealing device includes an annular seal member and an annular slinger. A seal member is attached to the end of the outer ring member, and a slinger is attached to the inner shaft member. The seal member has a rubber lip, and the lip contacts the slinger. Patent document 1 is disclosing the conventional sealing device which has a sealing member and a slinger.

JP 2001-141069 A

  The sealing device as described above is stored in a state where the central shaft C is stacked in the vertical direction as shown in FIG. 4 before being attached between the outer ring member and the inner shaft member. When a plurality of sealing devices 90 are stacked in the vertical direction, the slinger 92 is sunk in the lower sealing device 90-1 due to the weight of the upper sealing device 90-2. When the slinger 92 is pushed from above and sinks, the lip 93 is greatly elastically deformed, and the air (atmosphere) in the closed space K formed between the lip 93 and the slinger 92 escapes to the outside. When a plurality of sealing devices 90 stacked on top of each other are unloaded from the storage position, the closed space K may become negative pressure in the lower sealing device 90-1.

  Even if the sealing device 90 stacked on the upper side is gradually carried out and reduced, in the lower sealing device 90-1, the closed space K is at a negative pressure, so that the slinger 92 remains submerged. Become. Then, as shown by an arrow X in FIG. 4, when the upper sealing device 90-2 is moved in the radial direction and carried out, a part 99 of the sealing device 91 of the lower sealing device 90-1 is removed. There is a risk that it may interfere with the portion 98 and cause unloading failure.

  Further, the sealing device 90 in the storage position is transported to the assembly position of the wheel bearing device in a state where the seal member 91 and the slinger 92 are opposed to each other and set as a set. Therefore, when the closed space K is conveyed in a negative pressure state, and the sealing device 90 is attached between the outer ring member and the inner shaft member in a negative pressure state, the lip 93 comes into contact with the slinger 92. There is a problem that the generated sliding resistance is increased by the negative pressure.

As described above, when the seal member 91 and the slinger 92 approach each other in the axial direction, and the lip 93 is pushed by the slinger 92 and elastically deforms greatly, the closed space K tends to be negative pressure.
Then, this invention aims at suppressing that a sealing member and a slinger approach the axial direction largely in the state where the sealing device is stored.

  The sealing device of the present invention includes a seal member attached to the first member, and a slinger attached to the second member and provided facing the seal member, and the slinger has a seal surface facing in the axial direction. The seal member has a lip extending toward the seal surface side, and has a higher rigidity against an axial load than the lip. When the seal member and the slinger approach the axial direction, the seal member And a support portion that contacts a part of the slinger and prevents an increase in tightening margin of the lip that contacts the seal surface.

  According to this sealing device, even when a plurality of sealing devices are stacked with the central axis in the vertical direction in the storage state, a part of the slinger comes into contact with the support portion of the sealing member, so that the slinger is in contact with the sealing member. It is possible to suppress a large approach (sink).

  Further, a first gap is formed between the axial end of the seal member and the radial end of the slinger that is radially away from the axial end, and the seal member and the slinger When the center axis is the vertical direction, the lip can support the slinger by contacting the seal surface from below, and the lip supports the slinger, and the support portion and the slinger It is preferable that a second gap is formed between the radial ends and the second gap is narrower than the first gap. In this case, the second gap corresponds to the amount of movement until the slinger approaches and contacts the support portion of the seal member in the axial direction. When the seal member and the slinger are stored with the central axis in the vertical direction in a positional relationship in which the second gap is narrower than the first gap, the amount of movement can be reduced. As a result, it is possible to suppress the slinger from largely approaching (sinking) the seal member.

  In addition, the sealing device is mounted between the first member and the second member, and the axial end of the seal member and the slinger separated from the axial end in the radial direction A first gap is formed between the radial end portion, and a second gap is provided between the radial end portion of the slinger and the support portion separated in the axial direction from the radial end portion. Preferably, the second gap is narrower than the first gap. In this case, a labyrinth gap is formed by the first gap and the second gap, and foreign matter can be prevented from entering the inside where the lip is provided from the outside. The labyrinth gap is preferably narrow in order to suppress entry of foreign matter. However, if the first gap is too narrow, the seal member and the slinger may come into contact when the first member and the second member are eccentric. When the seal member and the slinger come into contact, resistance in relative rotation between the first member and the second member is increased. On the other hand, even if the second gap is narrow, when the first member and the second member are eccentric, the seal member and the slinger are difficult to contact. Therefore, the second gap is preferably narrower than the first gap.

  The lip is provided so as to extend in one axial direction and one radial direction, and the support portion has a facing surface that faces the lip in the radial direction, and the facing surface is in the axial direction. It is preferable to have a taper shape from the other radial direction to one radial direction as it goes to one side. In this case, the opening formed between the front end of the lip and the support is difficult to narrow. A space is formed between the lip and the support part, and even if foreign matter such as muddy water is present in this space, the foreign matter accumulates between the lip and the support part because the opening is not narrowed as described above. Can be suppressed.

  According to the present invention, even when a plurality of sealing devices are stacked with the central axis as the up and down direction in the storage state, the slinger is larger than the sealing member because a part of the slinger comes into contact with the support portion of the sealing member. It becomes possible to suppress approaching (sinking).

It is sectional drawing which shows an example of the rotation apparatus with which a sealing device is attached. It is sectional drawing which shows a sealing device and its periphery. It is sectional drawing which shows the state in which the sealing device is stored. It is sectional drawing which shows the state by which the conventional sealing device is stored.

[Rotating device to which the sealing device is attached]
FIG. 1 is a cross-sectional view showing an example of a rotating device to which a sealing device is attached. The rotating device shown in FIG. 1 is a wheel bearing device (hub unit) 10 used in a vehicle such as an automobile. The wheel bearing device 10 is attached to a suspension device (knuckle) included in a vehicle body of an automobile, and supports the wheel rotatably. The wheel bearing device 10 includes an outer ring member 12, an inner shaft member 11, a plurality of balls 13 that are rolling elements, a retainer 14, and a first sealing device 15 provided on one side in the axial direction, And a second sealing device 16 provided on the other side in the axial direction. The sealing devices 15 and 16 can prevent foreign matter such as muddy water existing outside from entering the inside of the bearing 7 where the balls 13 are provided between the outer ring member 12 and the inner shaft member 11. .

  Outer raceway surfaces 12 a and 12 b on which the balls 13 roll are provided on the inner peripheral side of the outer ring member 12. The inner shaft member 11 includes a hub shaft (inner shaft) 23 and an inner ring 24 attached to one side of the hub shaft 23 in the axial direction. An inner shaft raceway surface 11 a is formed on the outer peripheral side of the hub axle 23, and an inner ring raceway surface 11 b is formed on the outer peripheral surface of the inner ring 24. A plurality of balls 13 are provided between the outer raceway surface 12a and the inner shaft raceway surface 11a. A plurality of balls 13 are provided between the outer raceway surface 12b and the inner ring raceway surface 11b. Between the outer ring member 12 and the inner shaft member 11, balls 13 are provided in two rows. The cage 14 holds a plurality of balls 13 in each row.

[About the sealing device 15]
FIG. 2 is a cross-sectional view showing the first sealing device 15 and its surroundings. The right side in FIG. 2 (one side in the axial direction) is the external space Q, and the left side in FIG. 2 (the other side in the axial direction) is the internal space (the bearing interior 7). The first sealing device 15 (hereinafter referred to as “sealing device 15”) includes an annular seal member 31 and an annular slinger 32. The seal member 31 is attached to the inner peripheral side of the axial end portion 12c of the outer ring member 12 (first member). The slinger 32 is attached to the outer peripheral side of the inner ring 24 (second member). Between the outer ring member 12 and the inner ring 24, the seal member 31 and the slinger 32 are provided to face each other. The seal member 31 and the slinger 32 are attached and fixed between the outer ring member 12 and the inner ring 24 by press-fitting.

  The seal member 31 includes a core bar 33 and a rubber seal body 36 fixed to the core bar 33. The core metal 33 is made of metal. The cored bar 33 has an L-shaped cross section. That is, the cored bar 33 is a cylindrical part 34 fitted into the outer ring member 12, and an annular part 35 that extends radially inward from an end 34 a on the other axial side of the cylindrical part 34. And have. The seal body 36 includes a fixing portion 37 fixed to the core metal 33, a plurality of lips 38, 39, and 40 provided extending from the fixing portion 37 toward the slinger 32, and a support portion 41. The fixing part 37 is a part that covers the cored bar 33. The fixing portion 37 has a protrusion 37c protruding to the other side in the axial direction. The seal body 36 of the present embodiment has three lips 38, 39, and 40. Although not shown, one lip (for example, lip 39) may be omitted.

  The first lip 38 is provided so as to extend from the fixed portion 37 in one axial direction and one radial direction. In the present embodiment, the “one radial direction” is “radially outward”. Therefore, “the other in the radial direction” is “inward in the radial direction”. The second lip 39 is provided radially inward of the first lip 38. The second lip 39 and the first lip 38 are provided so as to extend from the fixing portion 37 in substantially the same direction, and are in a substantially parallel arrangement. The third lip 40 is provided to extend radially inward from the fixed portion 37. As shown in FIG. 2, when the sealing device 15 is attached between the outer ring member 12 and the inner ring 24 (hereinafter, this state is referred to as “attached state”), the lips 38, 39, 40 are slinger 32. To touch. Therefore, a first closed space K1 is formed between the first lip 38 and the second lip 39, and a second closed space K2 is formed between the second lip 39 and the third lip 40. It is formed. A space K3 formed between the portion (part 37a) fixed to the axial direction one side of the cylindrical portion 34 of the fixed portion 37 and the support portion 41 and the first lip 38 is an external space Q. Released. A space K <b> 4 formed between the portion (the other portion 37 b) of the fixing portion 37 that is fixed to the inner side in the radial direction of the annular portion 35 and the third lip 40 is opened to the bearing interior 7. .

  The support portion 41 is fixed to the cylindrical portion 34 and the annular portion 35 of the core metal 33. The support portion 41 extends from the radially outer portion 35a of the annular portion 35 toward one side in the axial direction, and extends from the other axial side portion 34b of the cylindrical portion 34 toward the radially inward side. Yes. The cross-sectional shape of the support part 41 of this embodiment is a trapezoid (in the cross section including the central axis of the sealing device 15) as shown in FIG. The support portion 41 has an annular ring-shaped surface 42 that faces one side in the axial direction, and a facing surface 43 that faces the first lip 38. The facing surface 43 has a tapered shape that goes from the radially inner side (the other radial direction) to the radially outer side (the one radial direction) as it goes to the other axial direction.

  The support portion 41 is fixed to two surfaces of the inner peripheral surface of the cylindrical portion 34 of the cored bar 33 and the side surface of the annular portion 35. The radial dimension T (minimum value) of the support portion 41 is larger than the thicknesses t1 and t2 of the first lip 38 and the second lip 39, respectively. Each of the first lip 38 and the second lip 39 is fixed to the fixing portion 37 and has a cantilever shape from the fixing portion 37 when viewed in cross section. With the above configuration, the support portion 41 has higher rigidity against the axial load than the first lip 38 and the second lip 39.

  The slinger 32 is made of metal. The slinger 32 has an L-shaped cross section. That is, the slinger 32 has a cylindrical fitting portion 44 that is fitted to the inner ring 24, and an annular flange that extends radially outward from one end 44 a in the axial direction of the fitting portion 44. Part 45. The slinger 32 of this embodiment has an annular magnetized member 46. The magnetized member 46 is fixed to one side in the axial direction of the flange portion 45. Further, the magnetized member 46 is provided so as to cover the flange portion 45 from the outer side in the radial direction and project to the other side in the axial direction. The projecting portion is referred to as a projecting portion 47. An annular first surface 48 that faces the other axial direction of the flange portion 45 and a cylindrical second surface 49 that faces the radially outer side of the fitting portion 44 are in contact with the lips 38, 39, and 40. 53. That is, the slinger 32 has a first surface 48 that faces in the axial direction as a part of the seal surface 53, and a second surface 49 that faces in the radial direction as another part of the seal surface 53.

  Thus, in the sealing device 15 of this embodiment, the sealing member 31 has the first lip 38 and the second lip 39. The first lip 38 and the second lip 39 are provided to extend toward the first surface 48 included in the sealing surface 53 of the slinger 32. The first lip 38 is a first main lip that contacts the flange portion 45 (first surface 48) and prevents foreign matter from entering from the outside (external space Q). The second lip 39 is a second main lip that contacts the flange portion 45 (first surface 48) and prevents foreign matter that has passed through the first lip 38 from entering the third lip 40 side. The seal member 31 has a third lip 40. The third lip 40 is provided extending toward the second surface 49 side included in the seal surface 53 of the slinger 32. The third lip 40 is a secondary lip that contacts the fitting portion 44 (second surface 49) and prevents the sealed object inside (bearing inside 7) from flowing out to the outside (external space Q). In the case of this embodiment, the sealing object is a lubricant such as grease.

  In the attached state, the support portion 41 (annular surface 42) and the radially outer end portion 50 of the slinger 32 (the end portion 50 including the protruding portion 47) are separated from each other with a minute dimension in the axial direction. Further, the end 50 on the radially outer side of the slinger 32 and the end 51 on one side in the axial direction of the seal member 31 (the part 37a of the fixed portion 37) are separated from each other with a small dimension in the radial direction. That is, in the attached state, the first gap e1 is formed between the end 51 on the one axial side of the seal member 31 and the radially outer end 50 of the slinger 32 that is separated from the end 51 in the radial direction. Is formed. A second gap e2 is formed between the end portion 50 on the radially outer side of the slinger 32 and the support portion 41 that is separated from the end portion 50 in the axial direction. The labyrinth gap 52 is constituted by the first gap e1 and the second gap e2. The labyrinth gap 52 prevents foreign matter in the external space Q from entering the space K3 formed between the first lip 38 and the support portion 41.

  The second gap e2 is narrower than the first gap e1. For example, the radial dimension of the first gap e1 is 0.3 millimeter or more and less than 0.7 millimeter, and the axial dimension of the second gap e2 is 0.1 millimeter or more and 0.3 millimeter. Is less than. In the present embodiment, the radial dimension of the first gap e1 is 0.5 millimeters, and the axial dimension of the second gap e2 is 0.1 millimeters. In FIG. 2, the gaps e1 and e2 are shown broadly for easy explanation.

[About the storage method of the sealing device 15]
The storage state of the sealing device 15 having the above configuration will be described. FIG. 3 is a cross-sectional view showing a state in which the sealing device 15 is stored at the storage position. The sealing device 15 is stored in a stacked state with the central axis C as the vertical direction. In FIG. 3, each of the sealing devices 15 is stored in a state in which the seal member 31 and the slinger 32 are opposed to each other. In the storage state, the first and second lips 38, 39 are in contact with the first surface 48 of the slinger 32 in the axial direction (vertical direction), and the third lip 40 is in the second state of the slinger 32. It will be in the state which contacted the surface 49 to radial direction (horizontal direction). In the upper sealing device 15-2, the seal member 31 and the slinger 32 are opposed to each other in substantially the same manner as the attachment state shown in FIG. For this reason, a second gap e <b> 2 is formed between the end portion 50 of the slinger 32 and the annular surface 42 of the support portion 41. Further, the first gap e1 is also formed. In the lower sealing device 15-1, the second gap e2 is zero.

  That is, in the storage state, the central axis C of the sealing device 15 is in the vertical direction, and in this state, the end portion 51 on one side in the axial direction of the seal member 31 and the slinger separated from the end portion 51 in the radial direction. A first gap e <b> 1 is formed between the 32 radially outer ends 50. The first and second lips 38 and 39 can support the slinger 32 by contacting the sealing surface 53 (first surface 48) from below. In a state where the first and second lips 38 and 39 support the slinger 32, a second gap e2 is formed between the support portion 41 and the radially outer end portion 50 (projecting portion 47) of the slinger 32. The Thus, when the central axis (C) of the seal member 31 and the slinger 32 is in the vertical direction, the second gap e2 is narrower than the first gap e1.

  When a plurality of sealing devices 15 are stacked in the vertical direction, the slinger 32 sinks (displaces downward) in the lower sealing device 15-1 due to the weight of the upper sealing device 15-2. When the slinger 32 sinks in the sealing device 15-1, the end portion 50 of the slinger 32 comes into contact with the annular surface 42 of the support portion 41. That is, the slinger 32 is sunk by a minute dimension. This minute dimension corresponds to a minute dimension in the axial direction in the second gap e2 (0.1 mm in this embodiment). In a state where the end portion 50 of the slinger 32 is in contact with the annular surface 42 of the support portion 41, the second gap e2 becomes zero.

  FIG. 3 shows a state where another sealing device 15-2 is mounted on the lower sealing device 15-1, but this is further illustrated on the sealing device 15-2. A plurality of sealing devices 15 are mounted. If another sealing device 15 is placed on the upper sealing device 15-2, the second gap e2 in the sealing device 15-2 may also become zero.

  As described above, the support portion 41 has higher rigidity against the axial load than the first lip 38 and the second lip 39. Further, a second gap e <b> 2 is formed between the annular surface 42 of the support portion 41 and the end portion 50 on the radially outer side of the slinger 32. The second gap e2 is very small (in this embodiment, 0.1 millimeter). For this reason, even if the sealing member 31 and the slinger 32 approach the axial direction due to sinking in the slinger 32, a part (projecting portion 47) of the slinger 32 comes into contact with the support portion 41 (annular surface 42) immediately. Therefore, it is possible to prevent the tightening allowance of each of the first lip 38 and the second lip 39 contacting the first surface 48 included in the seal surface 53 from increasing.

  Since a part of the slinger 32 comes into contact with the support portion 41 from the axial direction, the inner diameter D1 of the annular surface 42 is larger than the outer diameter D2 of the portion of the slinger 32 that contacts the annular surface 42 (projecting portion 47). It is set small (D1 <D2).

[About the sealing device 15 of this embodiment]
As described above, according to the sealing device 15 of the present embodiment, even when the plurality of sealing devices 15 are stacked with the central axis C as the vertical direction in the storage state, the slinger 32 is attached to the support portion 41 of the seal member 31. It is possible to suppress the slinger 32 from sinking with respect to the seal member 31 by the contact of the portion (projecting portion 47).

  The second gap e2 corresponds to the amount of movement until the slinger 32 approaches and contacts the support portion 41 of the seal member 31 in the axial direction. As shown in FIG. 3, in the present embodiment, the seal member 31 and the slinger 32 are stored with the central axis (C) in the vertical direction in a positional relationship where the second gap e2 is narrower than the first gap e1. Is done. Therefore, the amount of movement can be reduced, and the slinger 32 can be prevented from sinking with respect to the seal member 31.

  As described above, in the sealing device 15, it is possible to suppress the slinger 32 from sinking with respect to the seal member 31, and thus it is difficult for the first closed space K <b> 1 and the second closed space K <b> 2 to be negative pressure. Even if the lip 38, 39 is pushed by the slinger 32 and slightly elastically deforms, and the first closed space K1 and the second closed space K2 become negative pressure, the pressure is almost the same as the atmospheric pressure, The negative pressure is not so high that the lips 38, 39, 40 are attracted to the slinger 32. Then, each sealing device 15 is transported from the storage position to the assembly position of the wheel bearing device 10 (see FIG. 1), and this transport is kept in a set (set) with the seal member 31 and the slinger 32 facing each other. It is performed in the state. In the present embodiment, as described above, the first closed space K1 and the second closed space K2 are unlikely to become negative pressure. Or even if it becomes a negative pressure, since it is in a state substantially the same as the atmospheric pressure, for example, the negative pressure is easily eliminated by the relative displacement of the seal member 31 and the slinger 32 during the conveyance. . For this reason, it is possible to prevent the first closed space K1 and the second closed space K2 from being attached between the outer ring member 12 and the inner shaft member 11 in a negative pressure state. As a result, it is possible to prevent the sliding resistance generated when the lips 38, 39, and 40 are in contact with the slinger 32 from increasing as in the prior art, and to reduce the sliding torque of the wheel bearing device 10, In addition, it is possible to reduce the variation in sliding resistance for each product.

  As shown in FIG. 3, the seal member 31 has a protrusion 37c that protrudes to the other side in the axial direction. The protrusion 37c of the sealing member 31 included in the upper sealing device 15-2 contacts the magnetized member 46 of the slinger 32 included in the lower sealing device 15-1. By this projection 37c, the cored bar 33 (annular portion 35) and the magnetized member 46 of the seal member 31 are separated in the storage state. Therefore, the sealing member 31 of the upper sealing device 15-2 can be prevented from being attracted by the magnetic force to the slinger 32 (magnetization member 46) of the lower sealing device 15-1. As a result, when unloading the upper sealing device 15-2 from the storage state, unloading failure is prevented.

When the second gap e2 is larger than zero and the second gap e2 is in the same state as the attached state (see FIG. 2) as in the upper sealing device 15-2, the slinger 32 on one side in the axial direction The side surface 54 is located above the side surface 55 on one axial side of the seal member 31, or the side surface 54 on one axial side of the slinger 32 is aligned with the side surface 55 on one axial side of the seal member 31 and the shaft 55. It is in the same position (that is, the same height position) in the direction. In the present embodiment, the side surface 54 on one side in the axial direction of the slinger 32 is a side surface of the magnetized member 46.
Further, even when the second gap e2 is zero as in the lower sealing device 15-1, the side surface 54 on one axial side of the slinger 32 is on one axial side of the seal member 31. The side surface 55 of the slinger 32 has the same position in the axial direction (that is, the same height position), or the side surface 54 on one axial side of the slinger 32 is slightly smaller than the side surface 55 on one axial side of the seal member 31 ( The axial dimension of the second gap e2 is only 0.1 mm lower.
Therefore, even when the upper sealing device 15-2 is pulled out from the storage position in the radial direction and transported, the protrusion 37c of the sealing member 31 included in the upper sealing device 15-2 is formed by the lower sealing device 15-. It is possible to prevent a poor conveyance due to a large interference with the seal member 31 (end portion 51) of 1.

  In FIG. 2, the labyrinth gap 52 is formed by the first gap e1 and the second gap e2 as described above. The labyrinth gap 52 is preferably narrow in order to suppress entry of foreign matter. However, if the first gap e1 is too narrow, the seal member 31 and the slinger 32 may come into contact when the outer ring member 12 and the inner shaft member 11 (inner ring 24) are eccentric. In this case, the rotational resistance of the inner shaft member 11 (inner ring 24) increases. On the other hand, even if the second gap e2 is narrow, the seal member 31 and the slinger 32 are difficult to contact when the outer ring member 12 and the inner shaft member 11 (inner ring 24) are eccentric. Therefore, in the present embodiment, the second gap e2 is set narrower (than the first gap e1). As described above, it is possible to suppress the slinger 32 from sinking with respect to the seal member 31 by narrowing the second gap e2.

  In the sealing device 15 of the present embodiment (see FIG. 2), as described above, the first lip 38 is provided so as to extend in the axial direction and radially outward. The support portion 41 has a facing surface 43 that faces the first lip 38 in the radial direction. The facing surface 43 has a tapered shape that goes from the radially inner side to the radially outer side as it goes to one axial direction. According to this configuration, the opening formed between the first lip 38 and the support portion 41 on the tip portion 38a side is unlikely to be narrow. A space K3 is formed between the first lip 38 and the support portion 41. Even if foreign matter such as muddy water is present in the space K3, the opening is not narrowed as described above, so that the foreign matter is removed from the first lip. It is possible to suppress the accumulation between 38 and the support portion 41.

  As described above, according to the support portion 41, the second gap e2 is formed, and the labyrinth gap 52 can be lengthened. Moreover, according to the support part 41, sinking of the slinger 32 can be suppressed in the storage state of the sealing device 15 (see FIG. 3), and the closed spaces K1, K2 can be prevented from becoming negative pressure. And according to the said opposing surface 43 of the support part 41, it becomes possible to suppress that a foreign material accumulates between the 1st lip 38 and the support part 41 in use condition (refer FIG. 2).

The embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of rights of the present invention is not limited to the above-described embodiments, but includes all modifications within the scope equivalent to the configurations described in the scope of claims.
The sealing device 15 can be applied to other than the wheel bearing device 10 shown in FIG. Further, the support portion 41 has higher rigidity against the load in the axial direction than the lips (38, 39), and when the seal member 31 and the slinger 32 approach each other in the axial direction, the support portion 41 comes into contact with a part of the slinger 32 and the seal surface 53 ( Any configuration other than that shown in the drawings may be used as long as it prevents the tightening margin of the lips (38, 39) contacting the first surface 48) from increasing.

11: Inner shaft member (second member) 12: Outer ring member (first member)
31: Seal member 32: Slinger 38: First lip 39: Second lip 40: Third lip 41: Support portion 42: Annular surface 43: Opposing surface 48: First surface 49: Second surface 50: End Part 51: End part 53: Sealing surface e1: First gap e2: Second gap C: Center axis

Claims (4)

A sealing member attached to the first member; and a slinger attached to the second member and provided facing the sealing member;
The slinger has a sealing surface facing the axial direction,
The sealing member is
A lip provided extending toward the sealing surface side;
The rigidity with respect to the axial load is higher than that of the lip, and when the seal member and the slinger approach in the axial direction, a part of the slinger comes into contact with the seal surface and the tightening margin of the lip increases. And a support portion for preventing the sealing device. A first gap is formed between the axial end of the seal member and the radial end of the slinger that is radially away from the axial end,
When the center axis of the seal member and the slinger is in the vertical direction, the lip can support the slinger by contacting the seal surface from below, and the lip supports the slinger, A second gap is formed between the support and the radial end of the slinger;
The sealing device according to claim 1, wherein the second gap is narrower than the first gap. A first gap is formed between the axial end of the seal member and the radial end of the slinger that is radially away from the axial end,
A second gap is formed between the radial end portion of the slinger and the support portion separated in the axial direction from the radial end portion,
The sealing device according to claim 1, wherein the second gap is narrower than the first gap. The lip is provided to extend in one axial direction and one radial direction,
The support portion has a facing surface facing the lip in the radial direction,
The said opposing surface is a sealing device as described in any one of Claims 1-3 which has a taper shape which goes to radial direction one side from the other radial direction as it goes to one axial direction.

Images