JP2018080828A - Seal structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal structure which can prevent removal of a pressing member while inhibiting deterioration of sealability caused by axial movement of a shaft part relative to a bearing cup.SOLUTION: A seal structure 1 includes: a first member 11; a second member 6 which rotates relative to the first member 11; and an annular seal member 7 which is attached to the first member 11 and slidably contacts with the second member 6. The seal member 7 includes: a fixed part 34 fixed to the first member 11; a first lip part 31 having a contact part 31c which contacts with a first seal surface 41 of the second member 6; and a first pressing member 51 which presses the first lip part 31 to the first seal surface 41 side. A housing space S which houses the first pressing member 51 is formed in the first lip part 31, and an opening A opening the housing space S at one axial side is formed at the first lip part 31. The contact part 31c is disposed at one radial side located closer to the first seal surface 41 side than the housing space. A width of the opening A is reduced by elastic deformation of the contact part 31c caused by contact with the first seal surface 41.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sealing structure provided between two members that rotate relative to each other such as a shaft portion and a bearing cup in a cross shaft joint, for example.

  For example, in a spindle device of a steel rolling mill and a drive shaft of an automobile, a cross shaft joint is used as a universal joint at a connecting portion between the shafts. This cross shaft joint includes a cross shaft in which four shaft portions are arranged in a cross shape, a bottomed cylindrical bearing cup covering each shaft portion, an outer peripheral surface of each shaft portion, and an inner peripheral surface of the bearing cup. And a plurality of needle rollers disposed so as to be freely rotatable, and a yoke provided at an end of each shaft is coupled to the bearing cup. In addition, in order to prevent intrusion of water or the like into the accommodation space of the needle roller formed between the shaft portion and the bearing cup, and to prevent leakage of the lubricant from the accommodation space to the outside, A sealing structure is provided between the end portion and the end portion of the bearing cup (see, for example, Patent Documents 1 and 2).

  As a conventional sealing structure, for example, as shown in FIG. 8, a slinger 106 attached to the base portion of the shaft portion 104 in the cross shaft and a seal member 107 attached to the inner peripheral portion of the bearing cup 111 are provided. It has been known. The slinger 106 has a first seal surface 141 facing in one axial direction (upward in FIG. 8) and second and third seal surfaces 142 facing radially outward of the shaft 104 (rightward in FIG. 8). , 143. The seal member 107 includes first to third lip portions 131 to 133 that contact the first to third seal surfaces 141 to 143 of the slinger 106, respectively. The lip portions 131 to 133 are fixed to a cored bar 134 fixed to the bearing cup 111. A garter spring 152 is attached to the second lip portion 132 and presses the second lip portion 132 against the second seal surface 142.

  Further, as shown in FIG. 9, the sealing structure described in Patent Document 2 includes a seal retainer 218 attached to the base portion of the shaft portion 204, and a seal member 207 fixed to the seal retainer 218. The seal member 207 includes a first lip portion 231 and a second lip portion 232 that are in sliding contact with the inner peripheral surface of the bearing cup 211. The lip portions 231 and 232 are fixed to a cored bar 234 fixed to the seal retainer 218.

Japanese Patent Laying-Open No. 2015-124836 European Patent Publication No. 1783384

  In the cross shaft joint as described above, the shaft portion slightly moves in the radial direction and the axial direction within the allowable dimensional difference with respect to the bearing cup during use. In the case of the sealing structure shown in FIG. 8, if the elasticity of the first lip portion 131 is reduced due to deterioration due to long-term use or the like, the first lip portion 131 is moved by the axial movement of the shaft portion 104 with respect to the bearing cup 111. May move away from the first seal surface 141, and the sealing performance may be reduced.

  In the case of the sealing structure shown in FIG. 9, since both the first and second lip portions 231 and 232 are in sliding contact with the inner peripheral surface of the bearing cup 211, the axial movement of the shaft portion 204 with respect to the bearing cup 211 is possible. Sealing performance is hardly reduced. However, when the shaft portion 204 moves in the radial direction with respect to the bearing cup 211, the first and second lip portions 231, 232 approach the inner peripheral surface of the bearing cup 211 on one side of the shaft portion 204 in the radial direction. The first and second lip portions 231 and 232 move away from the inner peripheral surface of the bearing cup 211 on the other radial side. Therefore, it becomes difficult to obtain a uniform sealing property on both radial sides of the seal member 207. Further, the second lip portion 232 is pressed against the inner peripheral surface of the bearing cup 211 by applying a biasing force radially outward by a garter spring (pressing member) 252. However, since the garter spring 252 is attached to the second lip portion 232 in a contracted state, the garter spring 252 is easily bent and may be detached from the groove on the inner peripheral surface of the second lip portion 232.

  It is an object of the present invention to provide a sealing structure that can prevent the pressing member from being detached while suppressing a decrease in sealing performance due to the axial movement of the shaft portion with respect to the bearing cup.

(1) The present invention includes a first member, a second member that is disposed concentrically with the first member so as to face the first member in a radial direction, and rotates relative to the first member, and the first member. And an annular seal member that is slidably contacted with the second member, and the second member has a first seal surface facing the other radial direction side of the second member. The sealing member includes a fixing portion fixed to the first member, a first lip portion having a contact portion bonded to the fixing portion and contacting the first sealing surface, and the first lip portion. A first pressing member that presses toward the first seal surface, and an accommodation space for accommodating the first pressing member is formed inside the first lip portion, and the accommodation space is provided in the first lip portion. Is opened to one side in the axial direction, and the first pressing member is inserted into the housing space. An opening is formed, and the contact portion is disposed on one radial side, which is the first seal surface side in the radial direction with respect to the housing space, and the width of the opening extends to the first seal surface. It is reduced by elastic deformation of the contact portion due to contact.

  According to the above configuration, since the contact portion of the first lip portion contacts the first seal surface facing the other side in the radial direction, even if the second member moves in the axial direction relative to the first member, the first The sealing performance by the lip portion does not deteriorate. Further, the width of the opening for inserting the first pressing member into the accommodation space in the first lip portion is reduced by bringing the contact portion of the first lip portion into contact with the first seal surface. It can suppress that 1 press member will detach | leave.

(2) In the above configuration, the side edge of the contact portion constituting one end edge of the opening is in the first state where the contact portion is not in contact with the first seal surface, and the first pressing member In the second state where the contact portion is in contact with the first seal surface, and the other end in the radial direction than the end portion on the one radial direction side of the first pressing member. It is preferable to arrange | position.

  According to this configuration, in the first state where the contact portion of the first lip portion is not in contact with the first seal surface, the opening is made as wide as possible and the first pressing member is inserted into the accommodation space. In the second state in which the contact portion is in contact with the first seal surface, the opening width can be reduced to reliably prevent the first pressing member from being detached.

(3) In the above-described configuration, the second member has a second seal surface that faces one side in the radial direction, and the seal member is bonded to the fixing portion and contacts the second seal surface. And a second pressing member that presses the second lip portion toward the second seal surface.

  With this configuration, when the second member moves in the radial direction relative to the first member, even if the first lip portion moves in a direction away from the first seal surface at one side portion in the radial direction, the second member is moved. The lip portion moves in a direction approaching the second seal surface, and the first lip portion approaches the first seal surface even if the second lip portion moves in a direction away from the second seal surface in the other radial side portion. Move to. Therefore, a substantially uniform sealing property can be obtained on both sides in the radial direction of the seal member.

(4) In the configuration of (3), the second member has a third seal surface that faces one side in the radial direction, and the seal member is bonded to the fixing portion and contacts the third seal surface. It is preferable to further include a third lip portion.
With such a configuration, the sealing performance can be enhanced by the third lip portion in addition to the first lip portion and the second lip portion.

(5) In the configuration of (3), one of the first seal surface and the second seal surface is disposed radially outward, and the first seal surface and the second seal surface It is preferable that the other seal surface is disposed inward in the radial direction, and is disposed at an interval on the radially outer side of the one seal surface.
With such a configuration, the seal member is inserted between the first seal surface and the second seal surface that are spaced apart in the radial direction, and the first lip portion and the second lip portion are respectively inserted into each seal surface. Can be contacted. Moreover, arrangement | positioning of the 1st sealing surface of a 2nd member and a 2nd sealing surface can be simplified, and these can be produced accurately.

(6) In the configuration of (4), one of the first seal surface and the second and third seal surfaces is disposed radially outward, and the other seal surface is The second seal surface and the third seal surface are arranged side by side in the axial direction, arranged radially inward and spaced apart from the one seal surface in the radial direction. Preferably it is.
With such a configuration, a seal member is inserted between the first seal surface and the second and third seal surfaces that are spaced apart from each other in the radial direction, and the first to third lips are respectively attached to the seal surfaces. The parts can be brought into contact. Moreover, arrangement | positioning of the 1st-3rd sealing surface of a 2nd member can be simplified and these can be produced accurately.

  According to the sealing structure of the present invention, it is possible to prevent the pressing member from being detached while suppressing a decrease in sealing performance due to the axial movement of the shaft portion with respect to the bearing cup.

It is a partial exploded perspective view of a cross joint which applied the sealing structure concerning a 1st embodiment. It is sectional drawing of a sealing structure. It is sectional drawing of the sealing member of sealing structure. It is sectional drawing which shows the effect | action of a 1st lip | rip part. It is sectional drawing of the sealing member of the sealing structure which concerns on 2nd Embodiment. It is sectional drawing of the sealing member of the sealing structure which concerns on 3rd Embodiment. It is sectional drawing of the sealing member of the sealing structure which concerns on 4th Embodiment. It is sectional drawing of the sealing structure which concerns on a prior art. It is sectional drawing of the sealing structure which concerns on a prior art.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a partial exploded perspective view of a cross shaft joint to which a sealing structure according to the first embodiment is applied.
The cross joint 20 is used, for example, in a spindle device (not shown) of a steel rolling mill. As shown in FIG. 1, the cross joint 20 includes a cross shaft 2 having four shaft portions 4, a roller bearing portion 5 disposed on each shaft portion 4, and a pair of yokes 17. .

  The cross shaft 2 has a base portion 3 provided at the center and four shaft portions 4 extending from the base portion 3 in four directions along the axis X and the axis Z orthogonal to each other. The cross shaft 2 passes through the center of the base 3 and can rotate about a central axis C orthogonal to the axis X and the axis Z of the shaft 4. In the cross shaft 2, a grease supply path 13 for supplying a lubricant into the roller bearing portion 5 is formed in a cross shape along the axis X and the axis Z.

  The roller bearing portion 5 includes the above-described shaft portion 4, a plurality of needle rollers 9, and a bearing cup 11. The needle rollers 9 are arranged so as to roll along the outer peripheral surface of each shaft portion 4. The bearing cup 11 is formed in a bottomed cylindrical shape, and is fitted to the outer peripheral surface of the shaft portion 4 via needle rollers 9. Accordingly, the needle roller 9 rolls with the inner peripheral surface of the bearing cup 11 as the outer ring raceway and the outer peripheral surface of the shaft portion 4 as the inner ring raceway, whereby the bearing cup 11 swings around the axis Z of the shaft portion 4. It is possible. A washer 10 is provided between the front end surface of the shaft portion 4 and the bottom surface of the bearing cup 11. A roller guide 8, a seal member 7, and a slinger 6 are disposed on the inner side in the axial center Z direction of the needle roller 9. The sealing structure 1 according to the present invention is constituted by the seal member 7, the slinger (second member) 6, and the bearing cup (first member) 11.

FIG. 2 is a cross-sectional view of the sealing structure. FIG. 3 is a sectional view showing the seal member in a state where it is not in contact with the slinger, that is, in a natural state.
The sealing structure 1 prevents intrusion of water or the like into the arrangement space of the needle rollers 9 between the shaft portion 4 and the bearing cup 11, and prevents leakage of the lubricant from the arrangement space to the outside. It is provided for. In this specification, the lower side in FIG. 2 is referred to as “one axial direction side” and the upper side is referred to as “the other axial direction side”, but these do not indicate an absolute specific direction in the axial direction, Since it indicates a relative direction, reading may be performed by switching one side and the other side. The same applies to “radial one side” and “radial other side”.

  The slinger 6 constituting the sealing structure 1 is formed in an annular shape and is fitted to the outer peripheral surface of the base end portion of the shaft portion 4. The slinger 6 is formed with seal surfaces 41, 42, 43 that contact the lip portions 31, 32, 33 of the seal member 7. The slinger 6 has a slinger body 6a formed in a cylindrical shape along the outer peripheral surface of the shaft portion 4, and a first extending radially outward on one axial side (lower side in FIG. 2) of the slinger body 6a. The extension portion 6b and a second extension portion 6c extending from the distal end side of the first extension portion 6b to the other side in the axial direction (upper side in FIG. 2) are integrally provided.

On the outer peripheral surface of the slinger body 6a, second and third seal surfaces 42 and 43 are formed side by side in the axial direction. A first seal surface 41 is formed on the inner peripheral surface of the second extension portion 6c.
The slinger 6 is provided with a third extension 6d that extends further radially outward from the second extension 6c. The outer peripheral surface of the second extension portion 6c and the side surface on the other axial side of the third extension portion 6d are opposed to the end portion of the bearing cup 11 with a gap therebetween. This gap is a seal gap that prevents water and the like from entering between the slinger 6 and the bearing cup 11.

  The seal member 7 includes a cored bar (fixed part) 34 and lip parts 31, 32, 33. The cored bar 34 is fixed by being fitted to the inner peripheral surface of the bearing cup 11. The cored bar 34 includes a first cored bar 34a having a first cylindrical part 34a1 and a first annular part 34a2 that is bent radially inward from an end on the other axial side of the first cylindrical part 34a1. And a second cored bar 34b having a second cylindrical part 34b1 and a second annular part 34b2 bent inward in the radial direction from one axial end of the second cylindrical part 34b1. The second cylindrical portion 34b1 is superimposed on the inner side in the radial direction of the first cylindrical portion 34a1, and the second cored bar 34b is joined to the first cored bar 34a by crimping the end portion on the one axial side of the first cylindrical portion 34a1. It is fixed to.

  The lip portions 31, 32, and 33 include a first lip portion 31, a second lip portion 32, and a third lip portion 33 that are bonded to the core metal 34. The first lip portion 31 and the third lip portion 33 are bonded to the second annular portion 34b2 of the second core metal 34b, and the second lip portion 32 is bonded to the first annular portion 34a2 of the first core metal 34a. Has been.

  The second lip portion 32 extends from the first annular portion 34a2 to one side in the axial direction. A side surface on the radially inner side of the second lip portion 32 contacts the second seal surface 42 of the slinger 6. A concave portion 32a is formed on a radially outer side surface of the second lip portion 32, and a garter spring (second pressing member) 52 is provided in the concave portion 32a. The garter spring 52 is a coil spring formed in a ring shape. The garter spring 52 is accommodated in the concave portion 32a of the second lip portion 32 in a state of being elastically deformed in the extending direction, and is elastically restored in the contracting direction. The lip portion 32 is pressed toward the second seal surface 42 side.

  The third lip portion 33 extends from the radially inner end of the second annular portion 34b2 to one side in the axial direction. A radially inner side surface of the third lip portion 33 is in contact with the third seal surface 43 of the slinger 6. The third seal surface 43 is formed on an inclined surface (conical surface) whose outer diameter gradually decreases from one axial side to the other side.

  The first lip portion 31 includes a first portion 31a extending in the same direction from a side surface on one axial side of the second annular portion 34b2, and a radial direction from the extending end (one axial end portion) of the first portion 31a. A second portion 31b extending outward and a third portion 31c extending from the extending end (radially outer end) of the second portion 31b to the other side in the axial direction are provided. A radially outer side surface (outer peripheral surface) of the third portion 31 c contacts the first seal surface 41 of the slinger 6. Accordingly, the third portion 31 c constitutes a contact portion that contacts the first seal surface 41.

  A garter spring (first pressing member) 51 is accommodated in a space (accommodating space) S surrounded by the first portion 31a, the second portion 31b, and the third portion 31c. Further, an opening A for inserting the garter spring 51 into the accommodation space S is formed between the first portion 31a and the third portion 31c. The opening A is open to the other side in the axial direction. The garter spring 51 is formed by forming a coil spring in a ring shape. The garter spring 51 is housed in the housing space S in a state of being elastically deformed in the contracting direction, and is elastically restored in the extending direction, thereby bringing the third portion 31c into the first part. It is comprised so that it may press to the seal surface 41 side.

FIG. 4 is a cross-sectional view showing the operation of the first lip portion.
As shown by a solid line in FIG. 4, the third portion 31 c of the first lip portion 31 is inclined outward in the radial direction in the first state where it does not contact the first seal surface 41 of the slinger 6. . In the first state, the width W1 of the opening A between the first portion 31a and the third portion 31c is formed relatively wide. Specifically, in the first state, the radial position a of the inner peripheral edge (side edge) 31d of the third portion 31c, which is one edge of the opening A, is the radial outer end of the garter spring 51. It arrange | positions in the radial direction outer side rather than the radial direction position b. Therefore, it is easy to insert the garter spring 51 into the accommodation space S through the opening A.

On the other hand, as shown by a two-dot chain line in FIG. 4, in the second state where the third portion 31c is in contact with the first seal surface 41, the third portion 31c is elastically deformed radially inward, The width W2 of the opening A between the first portion 31a and the third portion 31c in the first state is the same as the first portion 31a and the third portion 31 in the first state.
The width is smaller than the width W1 of the opening A between the portion 31c. In the second state, the radial position a ′ at the inner peripheral edge 31 d of the third portion 31 c is disposed radially inward from the radial position b of the radially outer end of the garter spring 51. Therefore, it becomes difficult for the garter spring 51 to be detached from the accommodation space S, and the first lip portion 31 can be reliably brought into contact with the first seal surface 41. In particular, since the garter spring 51 is elastically deformed in the contracting direction, the garter spring 51 is easily bent and is easily detached from the accommodation space S. However, the garter spring 51 is reliably detached by reducing the width of the opening A. Can be prevented.

  A bulging portion 31c1 bulging inward in the radial direction is formed on the inner peripheral edge 31d of the tip of the third portion 31c in the first lip portion 31. By forming the bulging portion 31c1 as described above, when the third portion 31c is brought into contact with the first seal surface 41, the width of the opening A is made easy to elastically deform the third portion 31c radially inward. W2 can be made as small as possible.

  In the seal member 7 of the present embodiment, the first lip portion 31 is in contact with the first seal surface 41 disposed toward the radially inner side, and the second lip portion 32 and the third lip portion 33 are directed toward the radially outer side. Are in contact with the second and third sealing surfaces 42, 43. Therefore, even if the shaft portion 4 moves in the axial direction with respect to the bearing cup 11, the sealing performance does not deteriorate.

  Further, when the shaft portion 4 moves in the radial direction with respect to the bearing cup 11, the first lip portion 31 moves in a direction away from the first seal surface 41 on one side of the shaft portion 4 in the radial direction. The second and third lip portions 32 and 33 move in a direction approaching the second and third seal surfaces 42 and 43, and on the other side in the radial direction, the second and third lip portions 32 and 33 are second and third. The first lip portion 31 moves in a direction approaching the first seal surface 41 while moving away from the seal surfaces 42 and 43. Therefore, it becomes possible to ensure sealing performance substantially uniformly on both sides in the radial direction of the seal member 7.

  In the slinger 6, the second and third seal surfaces 42 and 43 are formed on the outer peripheral surface of the slinger body 6a, and the first seal surface 41 disposed radially outside the second and third seal surfaces 42 and 43 is provided. It is formed on the inner peripheral surface of the second extension 6c. Accordingly, the second and third seal surfaces 42 and 43 and the first seal surface 41 are disposed to face each other with a radial interval therebetween, and there is a space for disposing the seal member 7 therebetween. Is formed. By inserting the seal member 7 into the space, the lip portions 31 to 33 can be brought into contact with the first seal surface 41 and the second and third seal surfaces 42 and 43 which are arranged in the opposite directions with respect to the radial direction. . Moreover, since the 1st seal surface 41 and the 3rd seal surface 43 are arrange | positioned in the position which overlapped regarding the axial direction, the dimension of the axial direction of the sealing structure 1 can be made as small as possible.

[Other Embodiments]
FIG. 5 is a cross-sectional view of a sealing member having a sealing structure according to the second embodiment.
The seal member 7 of the present embodiment is different from the seal member 7 of the first embodiment in that the third lip portion 33 is not provided.
Since other configurations are the same as those of the first embodiment, detailed description thereof is omitted.

FIG. 6 is a cross-sectional view of a sealing member having a sealing structure according to the third embodiment.
The seal member 7 of this embodiment is different from the seal member 7 of the first embodiment in that the third lip portion 33 is not provided.
Furthermore, the 1st lip part 31 is contacting with respect to the outer peripheral surface of the slinger main body 6a. That is, the first seal surface 41 is the outer peripheral surface of the slinger main body 6 a and is formed side by side on the one axial side of the second seal surface 42. The first lip portion 31 includes a first portion 31a extending from the second annular portion 34b2 toward the one axial side, a second portion 31b extending radially inward from the extending end of the first portion 31a, and a second portion 31b. The garter spring 51 is housed in the housing space S that is surrounded by the first portion 31a, the second portion 31b, and the third portion 31c. Has been. The garter spring 51 of the present embodiment is attached to the first lip portion 31 in an extended state, and presses the third portion 31c by elastically deforming in the contracting direction. The width of the opening A formed between the first portion 31a and the third portion 31c is the same as that in the first state where the third portion 31c is not in contact with the first seal surface 41 of the slinger 6. The first portion changes from the first state to the second state in which the third portion 31c contacts the first seal surface 41 and is elastically deformed radially outward. Specifically, the width of the opening A between the first portion 31a and the third portion 31c in the second state is equal to the width of the opening A between the first portion 31a and the third portion 31c in the first state. Shrink than width.

Also in this embodiment, there exists an effect substantially the same as 1st Embodiment.
However, since the first lip portion 31 and the second lip portion 32 are in contact with the first and second seal surfaces 41 and 42 directed in the same direction with respect to the radial direction, the shaft portion 4 is in contact with the bearing cup 11. When moving in the radial direction, both lip portions 31 and 32 move away from the seal surfaces 41 and 42 on one radial side of the shaft portion 4. Therefore, the first embodiment is more advantageous from the viewpoint of uniformity of sealing performance.
Moreover, since the garter spring 51 of this embodiment is attached to the 1st lip | rip part 31 in the extended state, possibility of detachment | leave becomes low compared with 1st Embodiment. However, by reducing the width of the opening A, the possibility of the garter spring 51 being detached from the accommodation space S can be further reduced.

FIG. 7 is a cross-sectional view of a sealing member having a sealing structure according to the fourth embodiment.
The seal member 7 of the present embodiment is formed such that the opening A formed in the first lip portion 31 is opened to one side in the axial direction (the lower side in FIG. 7). That is, the first lip portion 31 includes a base portion 31g extending from the second annular portion 34b2 to one side in the axial direction, a fourth portion 31e extending from the base portion 31g, and a fifth portion 31f. The fifth portion 31 f is a contact portion that contacts the first seal surface 41.

  In the present embodiment, when the fifth portion 31f contacts the first seal surface 41, the fifth portion 31f is elastically deformed radially inward, and the width of the opening A is reduced. Therefore, the same operational effects as those of the first embodiment are obtained.

The present invention is not limited to the above-described embodiment, and can be implemented with appropriate modifications.
For example, in the third embodiment, the second seal surface may be formed on a surface facing radially inward, and the second lip portion may be brought into contact with the second seal surface from the radially inner side.
The first and second sealing surfaces are formed along (in parallel with) the axial direction, but may be formed with a slight inclination with respect to the axial direction, and the third sealing surface is formed with respect to the axial direction. However, it may be formed along the axial direction.

The seal member may be configured to be fixed to the shaft portion side and to contact the bearing cup side.
The sealing structure of the present invention can be applied to other than between the shaft portion and the bearing cup in the cross shaft joint.

1: Sealing structure, 6: Slinger (second member), 7: Seal member, 11: Bearing cup (first member), 31: First lip portion, 31c: Third portion (contact portion), 32: Second Lip part 33: Third lip part 34: Core metal (fixed part) 41: First seal surface 42: Second seal surface 43: Third seal surface 51: Garter spring (first pressing member) 52: Garter spring (second pressing member), A: opening, S: accommodation space, W1: width of opening, W2: width of opening

Claims (6)

A first member, a second member that is disposed concentrically with the first member so as to face the first member in a radial direction, the second member that rotates relative to the first member, the second member that is attached to the first member, and the second member An annular sealing member that is in sliding contact with the member, and a sealing structure comprising:
The second member has a first seal surface facing the other radial side of the second member;
The seal member includes a fixed portion fixed to the first member, a first lip portion having a contact portion bonded to the fixed portion and contacting the first seal surface, and the first lip portion as the first lip portion. A first pressing member that presses toward the sealing surface side,
An accommodation space for accommodating the first pressing member is formed inside the first lip portion,
The first lip portion is formed with an opening for opening the housing space on one side in the axial direction and inserting the first pressing member into the housing space.
The contact portion is disposed on one radial side that is the first seal surface side in the radial direction with respect to the housing space,
The sealing structure according to claim 1, wherein the width of the opening is reduced by elastic deformation of the contact portion due to contact with the first seal surface.   The side edge of the contact portion that constitutes one end edge of the opening is in the first state where the contact portion is not in contact with the first seal surface, and is one side in the radial direction with respect to the first pressing member. It is arrange | positioned and it arrange | positions in the radial direction other side rather than the edge part of the said radial direction one side in a said 1st press member in the 2nd state which made the said contact part contact the said 1st sealing surface. 2. The sealing structure according to 1. The second member has a second seal surface facing one side in the radial direction,
The seal member further includes a second lip portion that is bonded to the fixed portion and contacts the second seal surface, and a second pressing member that presses the second lip portion toward the second seal surface. The sealing structure according to claim 1 or 2. The second member has a third seal surface facing one side in the radial direction;
The sealing structure according to claim 3, wherein the sealing member further includes a third lip portion that is bonded to the fixing portion and contacts the third sealing surface.   One seal surface of the first seal surface and the second seal surface is disposed radially outward, and the other seal surface of the first seal surface and the second seal surface is The sealing structure according to claim 3, wherein the sealing structure is disposed inward in the radial direction and is disposed at an interval on the outer side in the radial direction of the one sealing surface.   One of the first seal surface and the second and third seal surfaces is disposed radially outward, and the other seal surface is disposed radially inward. In addition, the sealing structure according to claim 4, wherein the second sealing surface and the third sealing surface are arranged side by side in the axial direction, and are arranged at an interval on the radially outer side of the one sealing surface.

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