JP5971458B2 - Bearing seal structure - Google Patents

Description

  The present invention relates to a seal structure that suppresses leakage of grease and intrusion of external foreign matter by mounting a seal between an outer ring and an inner ring of a bearing. The seal structure of the present invention is used for, for example, a bearing mounted on a pitch / yaw drive unit of a wind power generator or a bearing mounted on another general machine.

  Seals are installed on bearings attached to the pitch / yaw drive section of the wind turbine generator to prevent leakage of internal grease and intrusion of external foreign matter. As the seal, an extrudate product consisting only of a rubber-like elastic body (elastic rubber) is used to make the wearability good (a string-like seal material is formed by extruding, and a predetermined length is used. Cut and join both ends to make the material annulus). The seal is fixed by fitting a protrusion provided on the seal fixing portion into a recess provided on the mating attachment member.

  However, if the seal fixing part is not sufficiently fixed, there is a concern that the seal may drop due to the occurrence of grease supply pressure or internal pressure, or that the seal may rotate together with the mating sliding member due to shear resistance during rotation. The

  Further, as a prior art to the present invention, there is a seal structure shown in FIG. 3, and this seal structure is provided with a protrusion (provided on the seal 51) in order to prevent the seal from falling off or due to shear resistance during rotation. An uneven press-fitting allowance allowance 55 is provided on one or both of the inner surface of the concave portion 54 provided on the base portion 52 and the counterpart mounting member 53, and the protrusion 52 is press-fitted into the concave portion 54 via a silane-based adhesive 56. (See Patent Document 1).

  However, in this prior art, since the silane-based adhesive 56 is used for fixing the seal 51, there is a disadvantage that much labor is required for the coating process and the drying process. Further, the seal 51 used for the bearing is generally required to be easily replaced, but it is not easy to peel off the fixing portion by the adhesive 56.

JP 2011-27235 A

  In view of the above points, the present invention can firmly fix a seal to a mating attachment member without using an adhesive, thereby preventing the seal from rotating and the seal from rotating due to shear resistance during rotation. It is an object to provide a seal structure for a bearing that can be used.

In order to achieve the above object, a seal structure according to claim 1 of the present invention is a seal structure that suppresses leakage of grease and intrusion of external foreign matter by mounting a seal between an outer ring and an inner ring of a bearing, wherein the seal Is formed of a rubber-like elastic body integrally including a fixing portion fixed to the mounting member which is one of the outer ring and the inner ring and a seal lip which is slidably in close contact with the other sliding member which is the other. The fixing portion includes a first annular protrusion and a second annular protrusion that protrude in a radial direction toward the attachment member, and an annular recess between the protrusions. The first annular protrusion is provided on the attachment member. The second annular protrusion is press-fitted with a radial interference into the second annular groove provided in the mounting member, and is inserted into the first annular groove with a radial interference. Both Annular projection between is pressed with a fastening margin in the radial direction, said along with the two projections, viewed write sandwiching the annular protruding portion from both sides in the axial direction, providing a slope-shaped step portion on the end face of the second annular projection A sloped step portion is provided corresponding to the inner surface of the second annular groove, and a radial retaining structure is provided by engaging the step portions in the radial direction .

  The seal structure according to claim 2 of the present invention is the seal structure according to claim 1, wherein the mounting member is the outer ring, the mating sliding member is the inner ring, and the seal is the outer ring. A fixing portion fixed to the inner ring and a seal lip that is slidably in close contact with the inner ring and is made of a rubber-like elastic body, and the fixing portion protrudes radially outward toward the outer ring. A first annular projection and a second annular projection, and an annular recess between the two projections; the first annular projection is press-fitted into a first annular groove provided in the outer ring; and the second annular projection is The annular convex portion between the two grooves is press-fitted into the annular recess, and the outer diameter of the first annular projection is the inner diameter of the groove bottom portion of the first annular groove. Larger than the outer diameter of the second annular projection The method is set to be larger than the inner diameter dimension of the bottom of the second annular groove, the outer diameter dimension of the bottom of the annular recess is set to be larger than the inner diameter dimension of the annular protrusion, The convex portion is sandwiched from both sides in the axial direction.

  The seal structure according to claim 3 of the present invention is the seal structure according to claim 1, wherein the mounting member is the inner ring, the mating sliding member is the outer ring, and the seal is the inner ring. A fixed portion fixed to the outer ring and a seal lip that is slidably in close contact with the outer ring, and is made of a rubber-like elastic body, and the fixed portion protrudes radially inward toward the inner ring. A first annular projection and a second annular projection, and an annular recess between the two projections; the first annular projection is press-fitted into a first annular groove provided in the inner ring; and the second annular projection is An annular convex portion between the two grooves is press-fitted into the annular recess, and an inner diameter dimension of the first annular projection is an outer diameter dimension of a groove bottom portion of the first annular groove. Smaller than the inner diameter of the second annular projection The method is set smaller than the outer diameter of the groove bottom of the second annular groove, the inner diameter of the groove bottom of the annular recess is set smaller than the outer diameter of the annular protrusion, The annular convex portion is sandwiched from both sides in the axial direction.

  In the seal structure of the present invention having the above-described configuration, the seal includes a fixing portion that is fixed to the mounting member that is one of the outer ring and the inner ring, and a seal lip that is slidably in close contact with the other sliding member that is the other ring. Are integrally formed with a rubber-like elastic body. The fixing portion includes a first annular protrusion and a second annular protrusion that protrude in the radial direction toward the mounting member, and an annular recess between both protrusions. The first annular protrusion is press-fitted into the first annular groove provided in the attachment member with a radial interference, and the second annular protrusion is press-fitted into the second annular groove provided in the attachment member with a radial interference, An annular convex portion between both grooves is press-fitted into the annular concave portion with a radial interference, and both projections sandwich the annular convex portion from both sides in the axial direction. Therefore, since the press-fit structure with the radial interference is provided at three locations and the sandwiching structure with the axial interference is provided, the seal is firmly attached to the counterpart mounting member by these multiple structures. It is possible to fix.

  In order to install a seal between the outer ring and the inner ring of the bearing, the first mode (inner lip specification) in which the seal is fixed to the outer ring and slidably contacted with the inner ring, and on the contrary, the seal is fixed to the inner ring and the outer ring Where the second aspect (outer lip specification) is considered, the invention according to claim 1 of the present application is directed to both the first aspect and the second aspect. On the other hand, the invention according to claim 2 of the present application targets only the first aspect, while the invention according to claim 3 of the present application targets only the second aspect, and the object is limited to one side. The structure is materialized.

  That is, in the invention according to claim 2 of the present application, the seal is integrally formed with a fixing portion fixed to the outer ring and a seal lip that is slidably in close contact with the inner ring, and is formed of a rubber-like elastic body. The fixing portion includes a first annular protrusion and a second annular protrusion that protrude outward in the radial direction toward the outer ring, and includes an annular recess between both protrusions. The first annular protrusion is press-fitted into a first annular groove provided in the outer ring, the second annular protrusion is press-fitted into a second annular groove provided in the outer ring, and the annular convex part between both grooves is press-fitted into the annular recess. As a premise of these press-fitting, the outer diameter of the first annular protrusion is set larger than the inner diameter of the groove bottom of the first annular groove, and the outer diameter of the second annular protrusion is the inner diameter of the groove bottom of the second annular groove. The outer diameter dimension of the groove bottom portion of the annular recess is set larger than the inner diameter dimension of the annular protrusion. Both projections sandwich the annular convex portion from both axial sides. Therefore, in the first mode in which the seal is fixed to the outer ring and slidably contacted with the inner ring, a press-fit structure having a radial interference is provided at three locations and a sandwiching structure having an axial interference is provided. Therefore, it is possible to firmly fix the seal to the counterpart mounting member by the plurality of structures.

  In the invention according to claim 3 of the present application, the seal is integrally formed with a fixed portion fixed to the inner ring and a seal lip that is slidably in contact with the outer ring, and is formed of a rubber-like elastic body. The fixing portion includes a first annular protrusion and a second annular protrusion that protrude radially inward toward the inner ring, and an annular recess is provided between both protrusions. The first annular protrusion is press-fitted into a first annular groove provided in the inner ring, the second annular protrusion is press-fitted into a second annular groove provided in the inner ring, and the annular convex part between both grooves is press-fitted into the annular recess. As a premise for these press-fitting, the inner diameter dimension of the first annular protrusion is set smaller than the outer diameter dimension of the groove bottom portion of the first annular groove, and the inner diameter dimension of the second annular protrusion is the outer diameter dimension of the groove bottom portion of the second annular groove. The groove bottom inner diameter dimension of the annular recess is set smaller than the outer diameter dimension of the annular protrusion. Both projections sandwich the annular convex portion from both axial sides. Therefore, in the second mode in which the seal is fixed to the inner ring and slidably contacted with the outer ring, a press-fit structure having a radial interference is provided at three locations and a sandwiching structure having an axial interference is provided. Therefore, it is possible to firmly fix the seal to the counterpart mounting member by the plurality of structures.

  The present invention has the following effects.

  That is, in the present invention, as described above, the press-fitting structure having a radial interference allowance is provided over three locations and the sandwiching structure having an axial interference allowance is provided, so that these plural structures are provided. Thus, the seal can be firmly fixed to the counterpart mounting member. Therefore, as the intended purpose of the present invention, the seal can be firmly fixed to the mating attachment member without using an adhesive, so that the seal can be prevented from falling off or due to shear resistance during rotation. . In addition, since no adhesive is used to fix the seal, it is easy to attach and detach the seal.

Sectional drawing of the principal part of the seal structure which concerns on 1st Example of this invention. Sectional drawing of the principal part of the seal structure which concerns on 2nd Example of this invention. Cross-sectional view of the main part of the seal structure according to the conventional example

  Next, embodiments of the present invention will be described with reference to the drawings.

First embodiment
FIG. 1 shows a seal structure according to a first embodiment of the present invention. The seal structure (sealing device) according to the embodiment is used for a bearing to be mounted on a pitch / yaw drive unit of a wind power generator, and a seal (seal member) 11 is provided between an outer ring 61 and an inner ring 71 of the bearing. By installing, it prevents leakage of internal grease and intrusion of external foreign matter such as muddy water and dust. Further, the seal structure according to the embodiment belongs to the first aspect in which the seal 11 is fixed to the outer ring 61 and is in sliding contact with the inner ring 71.

  The seal 11 is integrally provided with an annular fixing portion 12 fixed to the inner peripheral portion of the outer ring 61 and annular seal lips 17 and 18 that are slidably in close contact with the inner ring 71, and is made of a predetermined rubber-like elastic body. Molded. It is a so-called rubber-only molded article which is not provided with a reinforcing body such as a cored bar and is made only of a rubber-like elastic body. The seal 11 is fixed to the inner peripheral portion of the outer ring 61 only by fitting and press-fitting without using an adhesive.

  In the annular fixing portion 12, a first annular protrusion 13 and a second annular protrusion 14 that protrude radially outward toward the outer ring 61 are provided on the outer peripheral surface, and a relative relationship between the protrusions 13 and 14 is provided. An annular recess 15 is provided. The first annular protrusion 13 is disposed on the outer side (atmosphere side, upper side in the figure) of the bearing, and the second annular protrusion 14 is disposed on the inner side (grease side, lower side in the figure) of the bearing.

Of these, the first annular protrusion 13, there is to be press-fitted into the first annular groove 63 provided on the inner peripheral surface of the outer ring 61, an outer diameter D ₁ of the first annular protrusion 13 is first annular groove 63 is set to be larger than the groove bottom portion inner diameter dimension d ₁ , and accordingly, a radial tightening margin is set here.

The second annular protrusion 14 is press-fitted into a second annular groove 64 provided on the inner peripheral surface of the outer ring 61, and the outer diameter D ₂ of the second annular protrusion 14 is the groove bottom of the second annular groove 64. It is set to be larger than the inner diameter dimension d ₂ , and thus the radial tightening margin is set here.

The annular concave portion 15 is press-fitted with a relative annular convex portion 65 provided between the grooves 63 and 64, and the groove bottom outer diameter dimension D ₃ of the annular concave portion 15 is larger than the inner diameter dimension d ₃ of the annular convex portion 65. Therefore, the radial allowance is set here.

  Both protrusions 13 and 14 are configured to elastically sandwich the annular protrusion 65 from both sides in the axial direction while being pressed into the grooves 63 and 64.

  The combination of the first annular protrusion 13 and the first annular groove 63 has a straight cross-sectional shape in the radial direction, but the combination of the second annular protrusion 14 and the second annular groove 64 has a bent portion. The cross-sectional shape is provided with a radial engagement structure that makes it difficult to remove the second annular protrusion 14 radially inward. The bent portion is arranged such that, on the end surface on the bearing outer side of the second annular protrusion 14, the end surface 14b closer to the outer diameter portion is displaced toward the bearing outer side than the end surface 14a closer to the inner diameter portion, and both end surfaces 14a, 14b are arranged. In the same manner, the inner surface (side surface) on the bearing outer side of the second annular groove 64 has an outer diameter portion than the inner surface 64a near the inner diameter portion. The inner surface 64b closer to the bearing is displaced to the outside of the bearing and is formed by setting a stepped portion 64c having a slope shape between the inner surfaces 64a and 64b. The stepped portions 14c and 64c are in the radial direction. The above-mentioned engagement structure is obtained by engaging with.

The size relationship of each part is as follows when this is described collectively.
a. The outer diameter D ₁ of the first annular protrusion 13> the inner diameter dimension d ₁ of the groove bottom portion of the first annular groove 63.
b. The outer diameter D ₂ of the second annular protrusion 14> the groove bottom inner diameter d _{2 of} the second annular groove 64.
c. Groove bottom outer diameter dimension D _{3 of the} annular recess 15> Inner diameter dimension d _{3 of the} annular protrusion 65
d. The outer diameter D ₂ of the second annular protrusion 14> the outer diameter D ₁ of the first annular protrusion 13> the outer diameter D ₃ of the groove bottom of the annular recess 15.
e. Groove bottom inner diameter d _{2 of} the second annular groove 64> groove bottom inner diameter d _{1 of} the first annular groove 63> Inner diameter d _{3 of the} annular protrusion 65
f. Groove bottom portion inner diameter dimension d _{2 of} second annular groove 64> Outer ring body section inner diameter dimension d ₄ ≧ Inner diameter dimension d ₃ of annular projection 65

  The seal lips 17 and 18 are a combination of the first seal lip 17 slidably in contact with the end surface portion 71 a of the inner ring 71 and the second seal lip 18 slidably in contact with the outer peripheral surface 71 b of the inner ring 71. Is set. Of these, the first seal lip 17 is formed radially inward from the inner peripheral portion of the fixed portion 12 and obliquely toward the bearing inner side, and can slide on the end surface portion 71a of the inner ring 71 with its tip portion. Close to. On the other hand, the second seal lip 18 is formed on the outer peripheral portion of the fixed portion 12 and obliquely inwardly from the root portion of the second annular protrusion 14 toward the inside of the bearing, and has a tip portion thereof. The inner ring 71 is slidably in close contact with the outer peripheral surface 71b. Based on these arrangements and the orientation of the lip end, the first seal lip 17 is mainly in charge of sealing against foreign matter, and the second seal lip 18 is mainly in charge of sealing against grease.

In the seal structure having the above-described configuration, the seal 11 includes first and second seals that are slidably in close contact with the fixed portion 12 fixed to the inner peripheral portion of the outer ring 61, and the end surface portion 71a and the outer peripheral surface 71b of the inner ring 71. The lips 17 and 18 are integrally provided and formed of a rubber-like elastic body. The fixed portion 12 includes a first annular protrusion 13 and a second annular protrusion 14 that protrude radially outward toward the outer ring 61, and an annular recess 15 between the protrusions 13 and 14. The first annular protrusion 13 is press-fitted into a first annular groove 63 provided in the outer ring 61, the second annular protrusion 14 is press-fitted into a second annular groove 64 provided in the outer ring 61, and both grooves are inserted into the annular recess 15. The annular convex portion 65 between 63 and 64 is press-fitted, and as a premise of these press-fitting, the outer diameter dimension D ₁ of the first annular protrusion 13 is set larger than the groove bottom inner diameter dimension d ₁ of the first annular groove 63, outer diameter D ₂ of the second annular protrusion 14 is set larger than the groove bottom portion inner diameter d ₂ of the second annular groove 64, the inner diameter d ₃ of the groove bottom outer diameter D ₃ is annular protrusion 65 of annular recess 15 Therefore, the tightening margin in the radial direction is set in each case. Further, both the protrusions 13 and 14 elastically sandwich the annular protrusion 65 from both sides in the axial direction. Therefore, in the seal structure of the first aspect in which the seal 11 is fixed to the outer ring 61 and slidably contacted with the inner ring 71, press-fitting structures with radial tightening allowances are provided at three locations and the axial tightening allowance is set. Since the sandwiching structure is provided, the seal 11 can be firmly fixed to the outer ring 61 which is a mating attachment member by the plurality of structures. Therefore, the seal 11 can be firmly fixed to the outer ring 61 which is a mating attachment member without using an adhesive, and thus the seal 11 can be prevented from falling off or due to shear resistance during rotation. . In addition, since no adhesive is used to fix the seal 11, it is possible to easily attach and detach the seal 11.

Second embodiment ...
FIG. 2 shows a seal structure according to a second embodiment of the present invention. The seal structure (sealing device) according to the embodiment is used for a bearing to be mounted on a pitch / yaw drive unit of a wind power generator, and a seal (seal member) 11 is provided between an outer ring 61 and an inner ring 71 of the bearing. By installing, it prevents leakage of internal grease and intrusion of external foreign matter such as muddy water and dust. Further, the seal structure according to the embodiment belongs to the second aspect in which the seal 11 is fixed to the inner ring 71 and is in sliding contact with the outer ring 61.

  The seal 11 is integrally provided with an annular fixing portion 12 fixed to the outer peripheral portion of the inner ring 71 and annular seal lips 17 and 18 that are slidably in close contact with the outer ring 61, and is formed of a predetermined rubber-like elastic body. Has been. It is a so-called rubber-only molded article which is not provided with a reinforcing body such as a cored bar and is made only of a rubber-like elastic body. The seal 11 is fixed to the outer peripheral portion of the inner ring 71 only by fitting and press-fitting without using an adhesive.

  In the annular fixing portion 12, a first annular protrusion 13 and a second annular protrusion 14 projecting radially inward toward the inner ring 71 are provided on the inner peripheral surface thereof, and a relative relationship between the protrusions 13 and 14 is provided. An annular recess 15 is provided. The first annular protrusion 13 is disposed on the outer side (atmosphere side, upper side in the figure) of the bearing, and the second annular protrusion 14 is disposed on the inner side (grease side, lower side in the figure) of the bearing.

Among these, the first annular protrusion 13 is press-fitted into a first annular groove 73 provided on the outer peripheral surface of the inner ring 71, and the inner diameter dimension D ₁₁ of the first annular protrusion 13 is the same as that of the first annular groove 73. the groove bottom is smaller than the outer diameter d _11, thus here interference in the radial direction is set.

The second annular protrusion 14 is press-fitted into a second annular groove 74 provided on the outer peripheral surface of the inner ring 71, and the inner diameter dimension D ₁₂ of the second annular protrusion 14 is the outer diameter of the groove bottom portion of the second annular groove 74. is set smaller than the dimension d _12, thus here interference in the radial direction is set.

The annular concave portion 15 is press-fitted with a relative annular convex portion 75 provided between the grooves 73 and 74, and the groove bottom portion inner diameter dimension D ₁₃ of the annular concave portion 15 is smaller than the outer diameter dimension d ₁₃ of the annular convex portion 75. Therefore, the radial allowance is set here.

  Both protrusions 13 and 14 are configured to elastically sandwich the annular protrusion 75 from both sides in the axial direction while being pressed into the grooves 73 and 74.

  The combination of the first annular protrusion 13 and the first annular groove 73 has a straight cross-sectional shape in the radial direction, but the combination of the second annular protrusion 14 and the second annular groove 74 has a bent portion. The cross-sectional shape is provided with a radial engagement structure that makes it difficult to remove the second annular protrusion 14 radially outward. The bent portion is disposed on the end surface of the second annular protrusion 14 on the bearing outer side such that the end surface 14b closer to the inner diameter portion is displaced toward the outer side of the bearing than the end surface 14a closer to the outer diameter portion. In the same manner, the inner surface (side surface) on the bearing outer side of the second annular groove 74 has a larger inner diameter portion than the inner surface 74a near the outer diameter portion. The closer inner surface 74b is displaced to the outside of the bearing and is formed by setting a sloped stepped portion 74c between the inner surfaces 74a, 74b. These stepped portions 14c, 74c are in the radial direction. The above-mentioned engagement structure is obtained by engaging with.

The size relationship of each part is as follows when this is described collectively.
a. The inner diameter dimension D ₁₁ of the first annular protrusion 13 <the outer diameter dimension d ₁₁ of the groove bottom portion of the first annular groove 73.
b. The inner diameter dimension D ₁₂ of the second annular protrusion 14 <the outer diameter dimension d ₁₂ of the groove bottom portion of the second annular groove 74.
c. Groove bottom inner diameter dimension D _{13 of} annular recess 15 <Outer diameter dimension d ₁₃ of annular protrusion 75
d. Inner diameter D ₁₂ of second annular protrusion 14 <Inner diameter dimension D ₁₁ of first annular protrusion 13 <Inner groove dimension D _{13 of} annular recess 15
e. Groove bottom outer diameter dimension d _{12 of} the second annular groove 74 <groove bottom outer diameter dimension d _{11 of} the first annular groove 73 <outer diameter dimension d ₁₃ of the annular protrusion 75
f. Groove bottom outer diameter dimension d _{12 of} the second annular groove 74 <Outer diameter dimension d ₁₄ of the inner ring main body section ≦ Outer diameter dimension d ₁₃ of the annular convex section 75

  The seal lips 17 and 18 are a combination of the first seal lip 17 slidably in contact with the end surface 61a of the outer ring 61 and the second seal lip 18 slidably in contact with the inner peripheral surface 61b of the outer ring 61. It is set by. Of these, the first seal lip 17 is formed radially outward from the outer peripheral portion of the fixed portion 12 and obliquely toward the bearing inner side, and can slide on the end surface portion 61a of the outer ring 61 with the tip portion thereof. Closely. On the other hand, the second seal lip 18 is formed at an inner peripheral portion of the fixed portion 12 and obliquely outward from the root portion of the second annular protrusion 14 and toward the inner side of the bearing. Is slidably in close contact with the inner peripheral surface 61b of the outer ring 61. Based on these arrangements and the orientation of the lip end, the first seal lip 17 is mainly in charge of sealing against foreign matter, and the second seal lip 18 is mainly in charge of sealing against grease.

In the seal structure having the above configuration, the seal 11 is slidably in close contact with the fixed portion 12 fixed to the outer peripheral portion of the inner ring 71 and the axial end surface 61a and the inner peripheral surface 61b of the outer ring 61. The seal lips 17 and 18 are integrally provided and molded by a rubber-like elastic body. The fixed portion 12 includes a first annular protrusion 13 and a second annular protrusion 14 that protrude radially inward toward the inner ring 71, and an annular recess 15 between the protrusions 13 and 14. The first annular protrusion 13 is press-fitted into a first annular groove 73 provided in the inner ring 71, the second annular protrusion 14 is press-fitted into a second annular groove 74 provided in the inner ring 71, and both grooves are inserted into the annular recess 15. An annular convex portion 75 between 73 and 74 is press-fitted. As a precondition for these press-fitting, the inner diameter dimension D ₁₁ of the first annular protrusion 13 is set smaller than the outer diameter dimension d ₁₁ of the groove bottom portion of the first annular groove 73, The inner diameter dimension D ₁₂ of the two annular protrusions 14 is set smaller than the outer diameter dimension d _{12 of the} bottom of the second annular groove 74, and the inner diameter dimension D _{13 of the} bottom of the annular recess 15 is the outer diameter dimension d ₁₃ of the annular protrusion 75. Therefore, the tightening margin in the radial direction is set in each case. Further, both the protrusions 13 and 14 elastically sandwich the annular protrusion 75 from both sides in the axial direction. Therefore, in the seal structure of the second mode in which the seal 11 is fixed to the inner ring 71 and the outer ring 61 is in sliding contact, press-fit structures having a radial tightening allowance are provided at three locations and have an axial tightening allowance. Since the sandwiching structure is provided, the seal 11 can be firmly fixed to the inner ring 71 which is the mating attachment member by the plurality of structures. Therefore, the seal 11 can be firmly fixed to the inner ring 71 which is the counterpart mounting member without using an adhesive, and thus the seal 11 can be prevented from falling off or due to shear resistance during rotation. . In addition, since no adhesive is used to fix the seal 11, it is possible to easily attach and detach the seal 11.

  In the first embodiment, the seal structure belonging to the first mode in which the seal 11 is fixed to the outer ring 61 and slidably contacted with the inner ring 71 will be described. In the second embodiment, the seal 11 is fixed to the inner ring 71. Thus, the seal structure belonging to the second mode in which the outer ring 61 is brought into sliding contact with the outer ring 61 has been described. However, these seal structures are the pitch portions of the propeller in the wind turbine generator (the propeller of the wind turbine is perpendicular to the main shaft axis with respect to the main shaft). When used in a bearing of a slewing bearing section that pivots around an axis) or a yaw section (slewing bearing section that supports a nacelle of a windmill so as to be pivotable with respect to a support base), the seal 11 includes an outer ring 61 and an inner ring 71 of the bearing. In order to prevent grease leakage between them and to prevent foreign matter from entering from outside, they are installed at both ends of the bearing. In addition, the seal 11 is made of an extruded molded string-like rubber material (seal material) having the same cross section, and this string-like rubber material is used as an annular seal that matches the size of the seal mounting portion of the bearing. Cut at an appropriate length and bond the cross sections at both ends. Therefore, since the pair of seals 11 installed at both ends of the bearing are made of a single rubber-like rubber material having the same cross section, one inner bearing end is provided with a fixing groove on the outer ring side. A lip-type annular seal is used, and an outer-lip-type annular seal that is provided with a fixing groove on the inner ring side at the other bearing end is used.

DESCRIPTION OF SYMBOLS 11 Seal 12 Fixing part 13 1st cyclic | annular protrusion 14 2nd cyclic | annular protrusion 14a, 14b End surface 14c, 64c, 74c Step part 15 Annular recessed part 17, 18 Seal lip 61 Outer ring 61a, 71a End surface part 61b Inner peripheral surface 63,73 1st Annular groove 64, 74 Second annular groove 64a, 64b, 74a, 74b Inner surface 65, 75 Annular protrusion 71 Inner ring 71b Outer surface

Claims (3)

A seal structure that suppresses leakage of grease and intrusion of external foreign matter by mounting a seal between the outer ring and the inner ring of the bearing,
The seal is integrally provided with a fixed portion fixed to a mounting member that is one of the outer ring and the inner ring, and a seal lip that is slidably in close contact with the other sliding member that is the other, and is a rubber-like elastic body And
The fixing portion includes a first annular protrusion and a second annular protrusion protruding in a radial direction toward the mounting member, and an annular recess between the protrusions.
The first annular protrusion is press-fitted into a first annular groove provided in the attachment member with a radial interference, and the second annular protrusion is radially inserted into a second annular groove provided in the attachment member. The annular recess between the two grooves is press-fitted with a radial allowance in the annular recess,
The two projections, viewed write sandwiching the annular protruding portion from both sides in the axial direction,
A sloped stepped portion is provided on the end surface of the second annular protrusion, a sloped stepped portion is provided corresponding to the inner surface of the second annular groove, and the stepped portions are radially engaged by engaging each other in the radial direction. A seal structure for a bearing, characterized by being provided with a retaining structure. The seal structure according to claim 1,
The mounting member is the outer ring, the mating sliding member is the inner ring, and the seal is integrally provided with a fixed portion fixed to the outer ring and a seal lip that is slidably in close contact with the inner ring. Made of rubber-like elastic body,
The fixing portion includes a first annular protrusion and a second annular protrusion that protrude radially outward toward the outer ring, and an annular recess between the protrusions.
The first annular protrusion is press-fitted into a first annular groove provided in the outer ring, the second annular protrusion is press-fitted into a second annular groove provided in the outer ring, and the annular recess is interposed between the two grooves. The annular convex part is press-fitted,
The outer diameter dimension of the first annular protrusion is set larger than the inner diameter dimension of the groove bottom portion of the first annular groove, and the outer diameter dimension of the second annular protrusion is larger than the inner diameter dimension of the groove bottom portion of the second annular groove. The groove bottom outer diameter dimension of the annular recess is set larger than the inner diameter dimension of the annular protrusion,
The both protrusions sandwich the annular convex portion from both sides in the axial direction. The seal structure according to claim 1,
The mounting member is the inner ring, the mating sliding member is the outer ring, and the seal is integrally provided with a fixing portion fixed to the inner ring and a seal lip that is slidably in close contact with the outer ring. Made of rubber-like elastic body,
The fixing portion includes a first annular protrusion and a second annular protrusion that protrude radially inward toward the inner ring, and an annular recess between the protrusions.
The first annular protrusion is press-fitted into a first annular groove provided in the inner ring, the second annular protrusion is press-fitted into a second annular groove provided in the inner ring, and the annular recess is provided between the two grooves. The annular convex part is press-fitted,
An inner diameter dimension of the first annular protrusion is set smaller than a groove bottom outer diameter dimension of the first annular groove, and an inner diameter dimension of the second annular protrusion is smaller than a groove bottom outer diameter dimension of the second annular groove. The groove bottom inner diameter of the annular recess is set smaller than the outer diameter of the annular protrusion,
The both protrusions sandwich the annular convex portion from both sides in the axial direction.

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