JP6953264B2 - Sealed structure - Google Patents

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, in a spindle device of a rolling mill for steel 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 that covers each shaft portion, an outer peripheral surface of each shaft portion, and an inner peripheral surface of the bearing cup. A plurality of needle-shaped rollers that are rotatably arranged between the bearing cups are provided, and a yoke provided at the end of each shaft is connected to the bearing cup. Further, in order to prevent water or the like from entering the accommodating space of the needle-shaped roller formed between the shaft portion and the bearing cup and to suppress the leakage of the lubricant from the accommodating space to the outside, the base of the shaft portion. 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 of the shaft portion 104 on the cross shaft and a sealing 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 sealing surface 141 facing in one axial direction (upward in FIG. 8) and a second and third sealing surfaces 142 facing radially outward (right in FIG. 8) of the shaft portion 104. , 143 and so on. The seal member 107 includes first to third lip portions 131 to 133 that come into contact with the first to third seal surfaces 141 to 143 of the slinger 106, respectively. The lip portions 131 to 133 are fixed to the core metal 134 fixed to the bearing cup 111. A garter spring 152 is attached to the second lip portion 132, and the second lip portion 132 is pressed against the second sealing 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 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 the core metal 234 fixed to the seal retainer 218.

Japanese Unexamined Patent Publication No. 2015-124836 European Patent Publication No. 1783384

In the cross shaft joint as described above, the shaft portion moves slightly 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 sealed structure shown in FIG. 8, if the elasticity of the first lip portion 131 is reduced due to deterioration due to long-term use, the first lip portion 131 is moved in the axial direction with respect to the bearing cup 111. Moves away from the first sealing surface 141, which may reduce the sealing property.

In the case of the sealed 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 causes the shaft portion 204 to move in the axial direction. There is almost no deterioration in sealing performance. 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 and 232 tend to approach the inner peripheral surface of the bearing cup 211 on one side in the radial direction of the shaft portion 204. Although it moves, on the other side in the radial direction, the first and second lip portions 231,232 move in a direction away from the inner peripheral surface of the bearing cup 211. Therefore, it is difficult to obtain uniform sealing properties on both sides of the sealing member 207 in the radial direction. Further, the second lip portion 232 is subjected to a urging force outward in the radial direction by the garter spring (pressing member) 252, and is pressed against the inner peripheral surface of the bearing cup 211. However, since the garter spring 252 is attached to the second lip portion 232 in a contracted state, it is easily bent and may be separated from the concave groove on the inner peripheral surface of the second lip portion 232.

An object of the present invention is to provide a sealing structure capable of preventing the pressing member from coming off while suppressing deterioration of the sealing property 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 arranged concentrically with the first member in a radial direction and rotates relative to the first member, and the first member. It has a sealing structure including an annular sealing member attached to the second member and slidingly contacting the second member, and the second member has a first sealing surface facing the other side in the radial direction of the second member. The seal member includes a fixing portion fixed to the first member, a first lip portion having a contact portion adhered to the fixing portion and in contact with the first sealing surface, and the first lip portion. A first pressing member for pressing toward the first sealing surface side is provided, and a storage space for accommodating the first pressing member is formed inside the first lip portion, and the accommodating space is provided in the first lip portion. Is opened to one side in the axial direction to form an opening for inserting the first pressing member into the accommodation space, and the contact portion is on the first sealing surface side in the radial direction with respect to the accommodation space. It is arranged on one side in the radial direction, and the width of the opening is reduced by elastic deformation of the contact portion due to contact with the first sealing surface.

According to the above configuration, since the contact portion of the first lip portion comes into contact with the first seal surface facing the other side in the radial direction, even if the second member moves in the axial direction with respect to the first member, the first member The sealing property of the lip portion does not deteriorate. Further, since 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 sealing surface, the width of the opening is reduced from the accommodation space. 1 It is possible to prevent the pressing member from coming off.

(2) In the above configuration, the side edge of the contact portion constituting one end edge of the opening is the first pressing member in a first state in which the contact portion is not in contact with the first sealing surface. In a second state in which the contact portion is in contact with the first sealing surface, the first pressing member is arranged on one side in the radial direction with respect to the other side in the radial direction with respect to the end portion on one side in the radial direction of the first pressing member. It is preferable to be arranged in.

According to this configuration, in the first state where the contact portion of the first lip portion is not in contact with the first sealing 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 brought into contact with the first sealing surface, the width of the opening can be reduced to reliably prevent the first pressing member from coming off.

(3) In the above configuration, the second member has a second sealing surface facing one side in the radial direction, and the sealing member is adhered to the fixing portion and comes into contact with the second sealing surface. It is preferable that the portion and the second pressing member for pressing the second lip portion toward the second sealing surface side are further provided.

With such a configuration, when the second member moves in the radial direction with respect to the first member, even if the first lip portion moves in the direction away from the first sealing surface on one side portion in the radial direction, the second member The lip portion moves in a direction approaching the second sealing surface, and even if the second lip portion moves in a direction away from the second sealing surface on the other side portion in the radial direction, the first lip portion approaches the first sealing surface. Move to. Therefore, it is possible to obtain substantially uniform sealing properties on both sides of the sealing member in the radial direction.

(4) In the configuration of the above (3), the second member has a third sealing surface facing one side in the radial direction, and the sealing member is adhered to the fixing portion and comes into contact with the third sealing surface. It is preferable that the third lip portion is further provided.
With such a configuration, the sealing property 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 the above (3), one of the first sealing surface and the second sealing surface is arranged so as to be outward in the radial direction, and the first sealing surface and the second sealing surface are arranged. It is preferable that the other sealing surface of the seal surface is arranged inward in the radial direction and is arranged at intervals on the outer side in the radial direction of the one sealing surface.
With such a configuration, a sealing member is inserted between the first sealing surface and the second sealing surface arranged at intervals in the radial direction, and the first lip portion and the second lip portion are formed on each sealing surface, respectively. Can be contacted. Further, the arrangement of the first sealing surface and the second sealing surface of the second member can be simplified, and these can be manufactured with high accuracy.

(6) In the configuration of (4) above, one of the first sealing surface and the second and third sealing surfaces is arranged outward in the radial direction, and the other sealing surface is , The second seal surface is arranged inward in the radial direction, and the second seal surface and the third seal surface are arranged side by side in the axial direction. It is preferable to have.
With such a configuration, a sealing member is inserted between the first sealing surface and the second and third sealing surfaces arranged at intervals in the radial direction, and the first to third lips are inserted into each sealing surface, respectively. The parts can be brought into contact with each other. Further, the arrangement of the first to third sealing surfaces of the second member can be simplified and these can be manufactured with high accuracy.

According to the sealing structure of the present invention, it is possible to prevent the pressing member from coming off while suppressing the deterioration of the sealing property due to the axial movement of the shaft portion with respect to the bearing cup.

It is a partial decomposition perspective view of the cross shaft joint to which the sealing structure which concerns on 1st Embodiment is applied. It is sectional drawing of a sealed structure. It is sectional drawing of the sealing member of a sealing structure. It is sectional drawing which shows the action of the 1st lip part. It is sectional drawing of the seal member of the sealing structure which concerns on 2nd Embodiment. It is sectional drawing of the seal member of the sealing structure which concerns on 3rd Embodiment. It is sectional drawing of the seal member of the sealing structure which concerns on 4th Embodiment. It is sectional drawing of the sealed structure which concerns on the prior art. It is sectional drawing of the sealed structure which concerns on the prior art.

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

The cross axis 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 an axis X and an axis Z orthogonal to each other. The cross axis 2 is rotatable around a central axis C that passes through the center of the base portion 3 and is orthogonal to the axial center X and the axial center Z of the shaft portion 4. In the cross shaft 2, a greasing passage 13 for supplying a lubricant to the inside of 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 shaft portion 4 described above, a plurality of needle-shaped rollers 9, and a bearing cup 11. The needle-shaped rollers 9 are rotatably arranged 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 a needle-shaped roller 9. Therefore, the needle-shaped roller 9 rolls with the inner peripheral surface of the bearing cup 11 as the outer ring track and the outer peripheral surface of the shaft portion 4 as the inner ring track, 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 tip 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 arranged inside the needle-shaped roller 9 in the Z direction of the axial center. The sealing structure 1 according to the present invention is composed of the sealing member 7, the slinger (second member) 6, and the bearing cup (first member) 11.

FIG. 2 is a cross-sectional view of the sealed structure. FIG. 3 is a cross-sectional view showing a 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 water or the like from entering the arrangement space of the needle-shaped roller 9 between the shaft portion 4 and the bearing cup 11, and also prevents the lubricant from leaking to the outside from the arrangement space. It is provided for this purpose. In this specification, the lower side in FIG. 2 is referred to as "one side in the axial direction" and the upper side is referred to as "the other side in the axial direction", but these do not refer to an absolute specific direction in the axial direction. Since it points in a relative direction, one side and the other side may be interchanged for reading. The same applies to "one side in the radial direction" and "the other side in the radial direction".

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 sealing surfaces 41, 42, 43 that the lip portions 31, 32, 33 of the sealing member 7 come into contact with. Further, the slinger 6 is a first that extends outward in the radial direction on one side (lower side in FIG. 2) of the slinger main body 6a formed in a tubular shape along the outer peripheral surface of the shaft portion 4 in the axial direction. The extension portion 6b and the second extension portion 6c extending from the tip end side of the first extension portion 6b to the other side in the axial direction (upper side in FIG. 2) are integrally provided.

The second and third sealing surfaces 42 and 43 are formed on the outer peripheral surface of the slinger main body 6a so as to be arranged in the axial direction. Further, 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 portion 6d extending radially outward from the second extension portion 6c. The outer peripheral surface of the second extension portion 6c and the side surface of the third extension portion 6d on the other side in the axial direction face each other with a gap at the end of the bearing cup 11. This gap is a seal gap that prevents water or the like from entering between the slinger 6 and the bearing cup 11.

The seal member 7 includes a core metal (fixing portion) 34 and lip portions 31, 32, 33. The core metal 34 is fixed by being fitted to the inner peripheral surface of the bearing cup 11. The core metal 34 includes a first core metal 34a having a first cylindrical portion 34a1 and a first annular portion 34a2 that bends inward in the radial direction from the end on the other side in the axial direction of the first cylindrical portion 34a1. It is composed of a second core metal 34b having two cylindrical portions 34b1 and a second annular portion 34b2 that bends inward in the radial direction from one end in the axial direction of the second cylindrical portion 34b1. The second cylindrical portion 34b1 is overlapped in the radial direction of the first cylindrical portion 34a1, and the second core metal 34b becomes the first core metal 34a by caulking one end of the first cylindrical portion 34a1 in the axial direction. It is fixed to.

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

The second lip portion 32 extends from the first annular portion 34a2 in one axial direction. The radial inner side surface of the second lip portion 32 comes into contact with the second sealing surface 42 of the slinger 6. A recess 32a is formed on the radial outer side surface of the second lip portion 32, and a garter spring (second pressing member) 52 is provided in the recess 32a. The garter spring 52 is a coil spring formed in a ring shape, and is housed in the recess 32a of the second lip portion 32 in a state of being elastically deformed in the extending direction, and elastically returns in the contracting direction to the second. The lip portion 32 is pressed toward the second sealing 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. The radial inner side surface of the third lip portion 33 comes into contact with the third sealing surface 43 of the slinger 6. The third sealing surface 43 is formed on an inclined surface (conical surface) whose outer diameter gradually decreases from one side in the axial direction to the other side.

The first lip portion 31 has a first portion 31a extending in the same direction from a side surface on one side in the axial direction of the second annular portion 34b2 and a radial direction from the extending end (one side end in the axial direction) of the first portion 31a. A second portion 31b extending outward and a third portion 31c extending axially from the extending end (diameter outer end portion) of the second portion 31b are provided. The radial outer side surface (outer peripheral surface) of the third portion 31c comes into contact with the first sealing surface 41 of the slinger 6. Therefore, the third portion 31c constitutes a contact portion that comes into contact with the first sealing surface 41.

A garter spring (first pressing member) 51 is accommodated in the space (accommodation 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, is accommodated in the accommodation space S in a state of being elastically deformed in the contraction direction, and elastically returns in the extension direction to make the third portion 31c first. It is configured to press toward the seal surface 41 side.

FIG. 4 is a cross-sectional view showing the action of the first lip portion.
As shown by the solid line in FIG. 4, the third portion 31c of the first lip portion 31 is inclined outward in the radial direction in the first state where it is not in contact with the first sealing surface 41 of the slinger 6. .. In this first state, the width W1 of the opening A between the first portion 31a and the third portion 31c is formed to be relatively wide. Specifically, in the first state, the radial position a of the tip inner peripheral edge (side edge) 31d of the third portion 31c, which is one end edge of the opening A, is the radial outer end portion of the garter spring 51. It is arranged radially outside the radial position b. Therefore, the garter spring 51 can be easily inserted into the accommodation space S through the opening A.

On the other hand, as shown by the alternate long and short dash line in FIG. 4, in the second state where the third portion 31c is in contact with the first sealing surface 41, the third portion 31c is elastically deformed inward in the radial direction, and the second The width W2 of the opening A between the first portion 31a and the third portion 31c in the first state is the first portion 31a and the third in the first state.
It is smaller than the width W1 of the opening A with the portion 31c. Then, in the second state, the radial position a'at the tip inner peripheral edge 31d of the third portion 31c is arranged radially inside the radial position b of the radial outer end portion of the garter spring 51. Therefore, the garter spring 51 is difficult to separate from the accommodation space S, and the first lip portion 31 can be surely brought into contact with the first sealing surface 41. In particular, since the garter spring 51 is elastically deformed in the contraction direction, it easily bends and easily separates from the accommodation space S. However, by reducing the width of the opening A, the garter spring 51 can be reliably separated. Can be prevented.

A bulging portion 31c1 that bulges 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 such a bulging portion 31c1, when the third portion 31c is brought into contact with the first sealing surface 41, the width of the opening A is wide while making it easy for the third portion 31c to be elastically deformed inward in the radial direction. W2 can be made as small as possible.

In the seal member 7 of the present embodiment, the first lip portion 31 comes into contact with the first seal surface 41 arranged radially inward, and the second lip portion 32 and the third lip portion 33 face radially outward. It is in contact with the second and third sealing surfaces 42 and 43 arranged in the above direction. Therefore, even if the shaft portion 4 moves in the axial direction with respect to the bearing cup 11, the sealing property 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 the direction away from the first sealing 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 the direction approaching the second and third sealing surfaces 42 and 43, and on the other side in the radial direction, the second and third lip portions 32 and 33 move to the second and third. The first lip portion 31 moves in a direction away from the sealing surfaces 42 and 43, but moves in a direction approaching the first sealing surface 41. Therefore, it is possible to ensure the sealing property substantially uniformly on both sides of the sealing member 7 in the radial direction.

In the slinger 6, the second and third sealing surfaces 42 and 43 are formed on the outer peripheral surface of the slinger main body 6a, and the first sealing surface 41 arranged radially outside the second and third sealing surfaces 42 and 43 is formed. It is formed on the inner peripheral surface of the second extension portion 6c. Therefore, the second and third sealing surfaces 42 and 43 and the first sealing surface 41 are arranged so as to face each other with a radial distance from each other, and there is a space between them for arranging the sealing member 7. It 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, 43 arranged in opposite directions with respect to the radial direction. .. Further, since the first sealing surface 41 and the third sealing surface 43 are arranged at overlapping positions with respect to the axial direction, the axial dimension of the sealing structure 1 can be reduced as much 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 will be omitted.

FIG. 6 is a cross-sectional view of a sealing member having a sealing structure according to a third embodiment.
The seal member 7 of the present embodiment is different from the seal member 7 of the first embodiment in that the seal member 7 of the first embodiment is not provided with the above-mentioned third lip portion 33.
Further, the first lip portion 31 is in contact with 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 6a, and is formed so as to be arranged side by side on one side of the second seal surface 42 in the axial direction. The first lip portion 31 includes a first portion 31a extending axially from the second annular portion 34b2, a second portion 31b extending radially inward from the extending end of the first portion 31a, and a second portion. The garter spring 51 has a third portion 31c extending from the stretched end of the portion 31b to the other side in the axial direction, and the garter spring 51 is accommodated in the accommodation space S surrounded by the first portion 31a, the second portion 31b, and the third portion 31c. Has been done. 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 direction of contraction. Further, the width of the opening A formed between the first portion 31a and the third portion 31c is the first state in which the third portion 31c is not in contact with the first sealing surface 41 of the slinger 6 and the first state thereof. It changes from the state of 1 to the second state in which the third portion 31c is elastically deformed outward in the radial direction by coming into contact with the first sealing surface 41. Specifically, the width of the opening A between the first portion 31a and the third portion 31c in the second state is the width of the opening A between the first portion 31a and the third portion 31c in the first state. Reduce than width.

Also in this embodiment, substantially the same effect as that of the first embodiment is obtained.
However, since the first lip portion 31 and the second lip portion 32 come into contact with the first and second sealing surfaces 41 and 42 facing in the same radial direction, the shaft portion 4 with respect to the bearing cup 11. When moving in the radial direction, both lip portions 31, 32 move in a direction away from the sealing surfaces 41, 42 on one side in the radial direction of the shaft portion 4. Therefore, from the viewpoint of uniformity of sealing property, the first embodiment is more advantageous.
Further, since the garter spring 51 of the present embodiment is attached to the first lip portion 31 in an extended state, the possibility of detachment is lower than that of the first embodiment. However, by reducing the width of the opening A, the possibility of the garter spring 51 coming off 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 a fourth embodiment.
The seal member 7 of the present embodiment is formed by opening the opening A formed in the first lip portion 31 to one side in the axial direction (lower side in FIG. 7). That is, the first lip portion 31 has a base portion 31g extending axially from the second annular portion 34b2, and a fourth portion 31e and a fifth portion 31f extending bifurcated from the base portion 31g. The fifth portion 31f is a contact portion that comes into contact with the first sealing surface 41.

In the present embodiment, when the fifth portion 31f comes into contact with the first sealing surface 41, it is elastically deformed inward in the radial direction, and the width of the opening A is reduced. Therefore, it has the same effect as that of the first embodiment.

The present invention is not limited to the above embodiment, and can be modified as appropriate.
For example, in the third embodiment, the second sealing surface may be formed on a surface facing inward in the radial direction, and the second lip portion may be brought into contact with the second sealing surface from the inside in the radial direction.
The first and second sealing surfaces were formed along the axial direction (parallel), but may be formed slightly inclined with respect to the axial direction, and the third sealing surface may be formed with respect to the axial direction. Although it was formed at a slight inclination, it may be formed along the axial direction.

The seal member may be fixed to the shaft portion side and may be configured to come into contact with 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: Sealed structure, 6: Slinger (second member), 7: Seal member, 11: Bearing cup (first member), 31: First lip part, 31c: Third part (contact part), 32: Second Lip part, 33: 3rd lip part, 34: Core metal (fixed part), 41: 1st sealing surface, 42: 2nd sealing surface, 43: 3rd sealing surface, 51: Gata spring (1st pressing member) , 52: Gata spring (second pressing member), A: opening, S: accommodation space, W1: opening width, W2: opening width

Claims (6)

The first member, the second member which is arranged concentrically with the first member in the radial direction and rotates relative to the first member, and the second member which is attached to the first member and is attached to the first member. A sealing structure including an annular seal member that slides into contact with the member.
Said second member has a first sealing surface facing the radially inner side of the second member,
The seal member has a fixing portion fixed to the first member and a contact portion adhered to the fixing portion and in contact with the first seal surface on the radial outer side, while the seal member has a contact portion on the second member on the radial inner side. A first lip portion that does not abut and a first garter spring that presses the first lip portion toward the first sealing surface side are provided.
A storage space for accommodating the first garter spring is formed inside the first lip portion.
An opening is formed in the first lip portion for opening the accommodation space to one side of the axial direction and the other side in the axial direction and inserting the first garter spring into the accommodation space.
The contact portion is disposed in a radially outer side which is the first sealing surface in the radial direction from the accommodating space,
Width of said opening, it by the elastic deformation in the radial direction inner side of the contact portion due to contact with the first sealing surface, is reduced than before contact of the contact portion to the first sealing surface,
It said first garter spring is characterized that you have been elastically deformed in a direction to contract in the accommodating space, the sealing structure. Side edge of the contact portion constituting one edge of said opening, said contact portion in a first state that is not in contact with the first sealing surface, the radially outer side of the first garter spring disposed, the contact portion in the second state in contact with the first sealing surface is disposed the radially outer side radially inner side than the end of the said first garter spring, claim The sealed structure according to 1. It said second member has a second sealing surface facing the radially outer side,
The sealing member further includes a second lip portion that is adhered to the fixing portion and comes into contact with the second sealing surface, and a second garter spring that presses the second lip portion toward the second sealing surface side. The sealed structure according to claim 1 or 2. Said second member has a third sealing surface facing the radially outer side,
The sealing structure according to claim 3, wherein the sealing member further includes a third lip portion that is adhered to the fixing portion and is in contact with the third sealing surface. Before Stories second sealing surface is disposed outwardly in the radial direction, the first sealing surface, while being disposed radially inward, spaced radially outwardly of the second sealing surface The sealed structure according to claim 3, which is arranged in the same manner. The second seal surface and the third seal surface are arranged to be radially outward, the first seal surface is arranged to be radially inward , and the second seal surface and the second seal surface are arranged. the third is spaced radially outward spacing of the sealing surface, the second sealing surface and the third sealing surfaces are arranged side by side in the axial direction, the sealing structure according to claim 4.

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