JP2011069401A - Sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device keeping stable sealing performance over a long period of time. <P>SOLUTION: The sealing device 1 has: a slinger 4 mounted to one member 2 of relatively rotating two members 2, 4; and a sealing member 5 mounted to the other member 4, and the sealing member has a sealing lip 32 which slidably contacts a sealing contact surface 15 extending to the radial direction orthogonal to the axial direction of the slinger 4. The sealing device 1 includes an elastic member 6 formed to have a circular shape and elastically deformable in the axial direction orthogonal to the radial direction of a circle. The sealing member 5 is provided with a circularly formed mounting concave part 35 for mounting the elastic member 6 in an elastically deformed state of being shrinked in the axial direction, on a back-face side of the sealing lip 32. A lip edge 32a of the sealing lip 32 is pressed to the sealing contact surface 15 by elastic force of the elastic member 6. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sealing device having a slinger and a seal member having a seal lip slidably in close contact with the slinger.

  Conventionally, as a kind of sealing device that prevents leakage of fluid to be sealed such as lubricating oil, a slinger attached to one of two members that rotate relative to each other, and slidable to a slinger attached to the other member There is known a combination type having a sealing member having a sealing lip that is in close contact with (see, for example, Patent Document 1).

  FIG. 6 shows an example of a conventional sealing device. A conventional sealing device 51 includes a slinger 53 attached to a rotating shaft 52 that is a rotating member as one of two members that rotate relative to each other, and a fixing as the other member of the two members that rotate relative to each other. It has a seal member 55 attached to a housing 54 as a member so as to face the slinger 53.

  The slinger 53 is formed of a metal or the like, and has a mounting base portion 56 formed in a cylindrical shape that is attached to a desired position of the rotating shaft 52 by insertion or the like, and one end edge of the mounting base portion 56. 6 extends radially outward (upward in FIG. 6) from the left end edge located on the sealing side SS shown on the left side toward the housing 54 so as to be orthogonal to the axial direction of the mounting base portion 56 shown in the left-right direction in FIG. And an annular flat plate portion 57. A right surface 57a located on the atmosphere side AS shown on the right side of FIG. 6 which is one surface of the flat plate portion 57 is a flat surface, and a lip tip 67a of a seal lip 67, which will be described later, is slidably closely contacted. It is a contact surface 58.

  The seal member 55 has a cylindrical mounting body 61 and an annular seal body 62 fixed to the mounting body 61.

  The mounting body 61 is made of metal or the like, and has a cylindrical outer cylindrical portion 63 that is attached to a desired position of the housing 54 by fitting or the like, and an atmospheric side AS shown on the right side of the outer cylindrical portion 63 in FIG. An annular shape extending from the right end edge located at the center of the radial direction toward the rotation shaft 52 (downward in FIG. 6) so as to be orthogonal to the axial direction of the outer cylindrical portion 63 shown in the left-right direction in FIG. It has the connection flat plate part 64 and the inner side cylinder part 65 extended along the axial direction of the outer side cylinder part 63 toward the sealing side SS from the inner edge of this connection flat plate part 64. As shown in FIG. That is, the attachment main body 61 is formed in an annular shape having a U-shaped cross section in which the sealing side SS is opened as a whole. Further, the axial length of the inner cylinder portion 65 is shorter than the axial length of the outer cylinder portion 63.

  The seal main body 62 has a cylindrical base 66 fixed to the inner peripheral surface of the inner cylindrical portion 65 in the mounting main body 61, and from the left end edge in the axial direction of the base 66 toward the inner peripheral surface of the outer cylindrical portion 63. It has an annular seal lip 67 formed so as to gradually increase in diameter radially outward (upward in FIG. 6), and is formed into a lateral trumpet shape having a wide open left end located on the sealing side SS as a whole. Is formed. The surface of the seal lip 67 facing the sealing side SS is a seal surface 68. The tip located on the outer peripheral edge of the seal surface 68 is a lip tip 67a. The lip tip 67a is slidable with respect to the seal contact surface 58 of the slinger 53 from the axial direction with a required tightening allowance. It is formed to be in close contact with. Therefore, the seal member 55 has a seal lip 67 slidably in close contact with the slinger 53.

  The seal body 62 is integrally formed of a rubber-like elastic body such as rubber, or a resin such as a fluororesin having wear resistance and low friction characteristics.

  According to the conventional sealing device 51 having such a configuration, the lip tip 67a of the seal lip 67 is elastically brought in close contact with the seal contact surface 58 of the slinger 53 with a desired tightening margin, so that a fluid (not shown) Can be secured, that is, the sealing performance can be secured to prevent the fluid existing on the sealing side SS from flowing to the atmosphere side AS and leaking.

JP 2005-265162 A

  However, in the above-described conventional sealing device 51, the lip tip 67a of the seal lip 67 is elastically brought into close contact with the seal contact surface 58 with a required tightening margin. Along with this, there is a problem in that the tightening margin with respect to the seal contact surface 58 of the lip tip 67a is gradually reduced and the sealing performance is impaired.

  Therefore, there is a demand for a sealing device that can maintain a stable sealing performance for a long period of time.

  The present invention has been made in view of this point, and an object of the present invention is to provide a sealing device that can maintain a stable sealing property over a long period of time.

  In order to achieve the above-described object, the sealing device according to the first aspect of the present invention is characterized in that a slinger attached to one member of two members that rotate relative to each other, The slinger has an annular flat plate portion extending radially toward the other member, and a seal contact surface is provided on one surface of the flat plate portion. The seal member has an attachment main body attached to the other member, and a seal main body fixed to the attachment main body, and the seal main body has a preset tightening allowance. In a sealing device having an annular seal lip having a lip tip slidably in close contact with the seal abutting surface, the seal is formed in an annular shape and elastically deformed in an axial direction perpendicular to the radial direction of the ring Possible An elastic member, and the sealing member includes an annular mounting recess that is mounted in an elastically deformed state in which the elastic member contracts in the axial direction on the back side of the seal lip, The seal member is formed so that the elastic member is configured to press the tip of the lip toward the seal contact surface with the elasticity of the elastic member in the mounting state in which the elastic member is mounted in the mounting recess in the elastically deformed state. is there.

  And by adopting such a configuration, the lip tip is always pressed against the seal contact surface due to the elastic force of the elastic member, so the force with which the lip tip is in close contact with the seal contact surface is stabilized. Can be granted. As a result, a stable sealing property can be ensured over a long period of time.

  According to a second aspect of the present invention, the sealing device of the present invention is characterized in that, in the first aspect, the elastic member is a garter spring. And by employ | adopting such a structure, an elastic member can be formed easily and an elastic member can be made into a simple structure.

  According to a third aspect of the present invention, there is provided a sealing device according to the first or second aspect, wherein the seal body is formed of a rubber-like elastic body or a fluororesin. And by adopting such a configuration, when the seal body is formed of a rubber-like elastic body, the seal member can be baked and integrally molded on the mounting body, so that productivity is improved. Can do. In addition, when the seal body is made of fluororesin, the margin of friction due to wear on the lip is reduced due to the low friction characteristics of fluororesin compared to seal lips made of rubber-like elastic bodies. It is possible to reliably reduce the torque and to easily reduce the torque.

  According to a fourth aspect of the present invention, there is provided a sealing device according to any one of the first to third aspects, wherein a screw that exhibits a pump action is provided on the seal surface or the seal contact surface of the seal lip. It is in a formed point. And by employ | adopting such a structure, since the screw which exhibits a pump effect | action can return the fluid which is going to leak from the sealing side to the atmosphere side to a sealing side, sealing property can be improved.

  According to the sealing device of the present invention as set forth in claim 1, the force with which the tip of the lip comes into close contact with the seal contact surface can be stably applied by the elastic force of the elastic member. As a result, there are excellent effects such as ensuring a stable sealing performance over a long period of time.

  According to the sealing device of the present invention as set forth in claim 2, the elastic member can be easily formed, and there are excellent effects such that the availability of the elastic member can be simplified.

  According to the sealing device of the present invention described in claim 3, when the seal body is formed of a rubber-like elastic body, the seal member can be baked and integrally formed on the mounting body, so that productivity is improved. There are excellent effects such as improvement. In addition, when the seal body is made of fluororesin, the margin of friction due to wear on the lip is reduced due to the low friction characteristics of fluororesin compared to seal lips made of rubber-like elastic bodies. It is possible to reliably reduce the torque and to achieve excellent effects such as easy torque reduction.

  According to the sealing device of the present invention as set forth in claim 4, there is an excellent effect that the sealing performance can be enhanced by the screw exhibiting the pump action.

The expanded sectional view which shows the principal part of 1st Embodiment of the sealing device which concerns on this invention The expanded schematic sectional drawing in the free state of the elastic member of FIG. The figure similar to FIG. 1 which shows the principal part of 2nd Embodiment of the sealing device which concerns on this invention The figure similar to FIG. 1 which shows the principal part of 3rd Embodiment of the sealing device which concerns on this invention. The figure similar to FIG. 1 which shows the principal part of 4th Embodiment of the sealing device which concerns on this invention An enlarged cross-sectional view showing a main part of a conventional sealing device mounted state

  The present invention will be described below with reference to embodiments shown in the drawings.

  1 and 2 show a first embodiment of a sealing device according to the present invention. FIG. 1 is an enlarged sectional view showing a main part, and FIG. 2 is an enlarged schematic sectional view in a free state of the elastic member of FIG. It is.

  As shown in FIG. 1, the sealing device 1 of the present embodiment includes a slinger 3 attached to a rotating shaft 2 that is a rotating member as one of two members that rotate relative to each other, and two members that rotate relative to each other. The sealing member 5 attached to the housing 4 which is a fixing member as the other of the members so as to face the slinger 3 and the elastic member 6 formed in an annular shape.

  The slinger 3 is attached to a desired position of the rotary shaft 2 by insertion or the like, and a rotary shaft formed of a rubber-like elastic body on an annular slinger body 11 formed of a metal such as a cold-rolled steel plate. The elastic seal 12 is baked and formed integrally.

  The slinger body 11 includes a mounting base portion 13 formed in a cylindrical shape parallel to the axial direction shown in the left-right direction in FIG. 1, the inner peripheral surface of which faces the outer peripheral surface of the rotating shaft 2, and one end of the mounting base portion 13. 1 is extended radially outward (upward in FIG. 1) toward the housing 4 from the left end edge located on the sealing side SS shown on the left side of FIG. It is formed in an annular shape having a substantially L-shaped cross section having an annular flat plate portion 14. The inner diameter of the mounting base 13 is slightly larger than the outer diameter of the rotating shaft 2. Further, the right surface 14a located on the atmosphere side AS shown on the right side of FIG. 1 which is one surface of the flat plate portion 14 is a flat surface, and a seal abutment in which a lip tip 32a of a seal lip 32 described later is slidably in close contact. Surface 15 is formed. That is, the seal contact surface 15 is provided on one surface of the flat plate portion 14.

  The rotary shaft elastic seal 12 is formed so as to cover the inner periphery of the mounting base portion 13 of the slinger body 11, and a portion covering the inner periphery of the mounting base portion 13 is formed on the outer peripheral surface of the rotary shaft 2. On the other hand, the rotary shaft mounting portion 12a is provided with an appropriate tightening allowance. That is, the inner diameter of the rotary shaft mounting portion 12 a, and thus the slinger 3, is smaller than the outer diameter of the rotary shaft 2.

  The rotary shaft elastic seal 12 may be provided according to the design concept or the like.

  For example, the slinger 3 may be formed so that the inner peripheral surface of the mounting base portion 13 is directly attached to the rotary shaft 2 without providing the rotary shaft elastic seal 12. That is, you may form so that the internal peripheral surface of the attachment base | substrate part 13 of the slinger 3 may be fitted with respect to the rotating shaft 2. FIG.

  The seal member 5 is attached to a desired position of the housing 4 by fitting or the like, and has a mounting body 21 and a seal body 22 fixed to the mounting body 21.

  The mounting body 21 is integrally formed by baking a housing elastic seal 24 formed of a rubber-like elastic body on an annular mounting ring 23 formed of a metal such as a cold rolled steel plate (SPCC). ing.

  The mounting ring 23 includes an outer cylindrical portion 25 formed in a cylindrical shape, and an axial direction of the outer cylindrical portion 25 shown in the left-right direction in FIG. 1 from the right edge located on the atmosphere side AS of the outer cylindrical portion 25. An annular connecting flat plate portion 26 extending toward the center of the radial direction (downward in FIG. 1) toward the rotation shaft 2 so as to be orthogonal to the rotating shaft 2, and from the inner edge of the connecting flat plate portion 26 toward the sealing side SS. And an inner cylinder part 27 extending along the axial direction of the outer cylinder part 25. That is, the mounting ring 23 is formed in an annular shape having a U-shaped cross section with the sealing side SS opened as a whole.

  The outer cylindrical portion 25 has an outer diameter slightly smaller than the inner diameter of the housing 4. Furthermore, the inner diameter of the outer cylinder portion 25 is larger than the outer diameter of the flat plate portion 14 of the slinger 3 so that the left end portion of the inner peripheral surface of the outer cylinder portion 25 faces the outer peripheral surface of the flat plate portion 14 of the slinger 3. Is formed. Furthermore, the inner cylindrical portion 27 has an inner diameter larger than the outer diameter of the mounting base portion 13 of the slinger 3 so that the left end surface of the inner cylindrical portion 27 faces the right surface 14a of the flat plate portion 14 of the slinger 3. ing. Further, the axial length of the inner cylindrical portion 27 is shorter than the axial length of the outer cylindrical portion 25.

  The housing elastic seal 24 is formed so as to cover the outer periphery of the outer cylindrical portion 25 of the mounting ring 23 and the atmosphere side AS surface of the connecting flat plate portion 26 connected to the outer cylindrical portion 25. A portion covering the outer periphery of the outer cylindrical portion 25 is a housing mounting portion 24 a having an appropriate margin for the inner peripheral surface of the housing 4. That is, the outer diameter of the housing mounting portion 24 a, and hence the seal member 5, is larger than the inner diameter of the housing 4.

  The housing elastic seal 24 may be provided according to the design concept or the like.

  For example, the sealing member 5 may be formed so that the outer peripheral surface of the outer cylindrical portion 25 is directly attached to the housing 4 without providing the housing elastic seal 24. That is, you may form so that the outer peripheral surface of the outer side cylinder part 25 of the attachment main body 21 which comprises a part of seal member 5 with respect to the housing 4 may be fitted.

  The seal main body 22 is formed of a rubber-like elastic body or resin, and has a cylindrical base 31 fixed to the outer peripheral surface of the inner cylindrical portion 27 of the mounting ring 23 and a sealing of the outer peripheral surface of the base 31. An annular seal lip 32 extending so as to gradually increase in diameter radially outward from the left end located on the side SS, and a radial direction from the right end located on the atmosphere side AS of the outer peripheral surface of the base 31 And an annular pressure receiving portion 33 extending outward. The surface of the seal lip 32 facing the sealing side SS is a seal surface 34. Further, the tip located at the outer peripheral edge of the seal surface 34 is a lip tip 32a, and this lip tip 32a slides with respect to the seal contact surface 15 of the slinger 3 with a required tightening margin CF from the axial direction. It is formed so as to be in close contact freely. Accordingly, the seal member 5 has a seal lip 32 that is slidably in close contact with the slinger 3.

  In order to clearly indicate the tightening margin CF for the seal contact surface 15 of the lip tip 32a, in FIG. 1, the exaggerated lip tip 32a is superimposed on the seal contact surface 15 and the tightening margin CF is exaggerated. .

  The seal body 22 is fixed to and integrated with the mounting ring 23. In the present embodiment, the inner peripheral surface 31a of the base portion 31 and the outer peripheral surface 27a of the inner cylindrical portion 27 are fixed, and the air side AS surface 33a of the pressure receiving portion 33 and the sealing side SS surface of the connection flat plate portion 26. 26a is fixed.

  Here, when a rubber-like elastic body is used as the material of the seal body 22, the seal body 22 is fixed to the mounting ring 23 by baking the seal body 22 on the mounting ring 23 and integrally molding it. be able to.

  When a fluororesin is used as the material of the seal body 22, the seal body 22 formed in a desired shape can be fixed to the mounting ring 23 by a joining means such as an adhesive (not shown).

  The fluororesin used for the seal body 22 preferably has a low friction characteristic with a low friction coefficient. As such a fluororesin, polytetrafluoroethylene (PTFE) or a modified PTFE which is copolymerized with a small amount of polymerizable perfluoroalkyl vinyl ether monomer and has improved creep resistance is generally used. Resins such as FEP and ETFE may be used as necessary.

  Moreover, as a fluororesin, you may mix | blend a filler so that abrasion resistance may be improved. As such a filler, glass fiber, carbon fiber, graphite, molybdenum, carbon or the like can be used alone or in combination of several kinds.

  The seal member 5 has a mounting recess 35 formed in an annular shape on the back side of the seal lip 32 that is located on the atmosphere side AS, in which the elastic member 6 is mounted in an elastically deformed state contracted in the axial direction.

  The mounting recess 35 of the present embodiment is opened on the radially outer side by the back surface 32b of the seal lip 32 and the surface 33b of the sealing side SS of the pressure receiving portion 33, and the distance between them is increased toward the radial center side. It is formed in a V-shaped section that gradually decreases. The elastic member 6 is formed in an annular shape between the back surface 32b of the seal lip 32 and the surface 33b on the sealing side SS of the pressure receiving portion 33 and is elastically deformable in an axial direction perpendicular to the radial direction of the ring. The elastic member 6 is elastically exerted so as to press the lip tip 32a toward the seal contact surface 15 along the axial direction. It has become.

  Therefore, the mounting recess 35 in the present embodiment is provided integrally with the seal body 22 and is provided on the back side of the seal lip 32.

  As the elastic member 6 of the present embodiment, an annular garter spring 37 formed of a hard steel wire (SWB) or the like is used.

  The garter spring 37 is mounted in the mounting recess 35 in an elastically deformed state contracted so as to be crushed in an axial direction perpendicular to the radial direction. In this way, by mounting the garter spring 37 in the mounting recess 35 in an elastically deformed state contracted in the axial direction, the lip tip 32a is sealed with the elasticity of the garter spring 37 in the mounting state in which the garter spring 37 is mounted in the mounting recess 35. It can be pressed toward the contact surface 15. In FIG. 1, the elastically deformed state contracted in the axial direction of the garter spring 37 (left and right directions in FIGS. 1 and 2) is exaggerated. In FIG. 2, an enlarged schematic cross section of the gutter spring 37 in a free state is indicated by a solid line, and an elastically deformed state (mounted state) is indicated by a two-dot chain line.

  The garter spring 37 is used as a spring of a well-known spring-loaded oil seal, and can exert a pressing force toward the radial center by expanding the diameter. Therefore, the ring inner diameter ID (FIG. 2) of the garter spring 37 in the free state may be formed smaller than the diameter of the bottom of the mounting recess 35. With this configuration, the garter spring 37 bites into the mounting recess 35 due to the radial force of the garter spring 37 in the mounting state in which the garter spring 37 is mounted in the mounting recess 35. The wedge action of expanding the opening end of the mounting recess 35 along the axial direction is exhibited. As a result, the urging force in the direction of pressing the lip tip 32a toward the seal contact surface 15 is exerted by the urging force of the garter spring 37 toward the radial center. This urging force is added to the elastic force of the garter spring 37 (the force when the garter spring 37 contracted in the axial direction attempts to return to its original shape), so that the lip tip 32a due to the elastic force is applied to the seal contact surface 15. It will work to increase the force of pressing towards.

  Therefore, a configuration in which only the tension force of the garter spring 37 is used, that is, a configuration in which the garter spring 37 is mounted in the mounting recess 35 without contracting in the axial direction can be employed.

  The size of the opening end of the mounting recess 35 in the axial direction is smaller than the size of the coil diameter CD (FIG. 2) of the garter spring 37, and the elastic deformation state in which the garter spring 37 is contracted in the axial direction. It is preferable in the sense that it can be easily mounted.

  In addition, the depth of the mounting recess 35 is formed to be larger than half the coil diameter CD of the garter spring 37, so that the garter spring 37 is reliably prevented from falling off the mounting recess 35. It is preferable in the sense that it can be.

  Further, the load when the garter spring 37 is extended by 5 mm may be 175 or more when the seal body 22 is made of fluororesin when the seal body 22 is made of rubber-like elastic body. This means that the lip tip 32a of the seal lip 32 formed of a fluororesin having a higher rigidity than the seal lip 32 formed of a rubber-like elastic body can be reliably pressed toward the seal contact surface 15. preferable. For example, when the seal body 22 is formed of a rubber-like elastic body, the load when the garter spring 37 is extended by 5 mm is 80 grams, and when the seal body 22 is formed of fluororesin, the load when the garter spring 37 is extended by 5 mm is 140 grams is recommended.

  The elastic member 6 is not limited to the garter spring 37, and may be any member that is formed in an annular shape and can be elastically deformed in the axial direction perpendicular to the radial direction. For example, similarly to the metal C-ring, a C-ring having an annular opening on the radially outer side or the radial center side can also be used.

  Further, as the sealing device 1, the fluid to be leaked to the atmosphere side AS is always sucked to the sealing side SS to the sealing surface 34 or the seal contact surface 15 of the sealing lip 32 according to the design concept. It is possible to form a screw (not shown) that exhibits the pumping action to return.

  The sealing device 1 can be attached between the inner ring and the outer ring of the bearing. In this case, the inner ring is generally the rotating shaft 2 and the outer ring is the housing 4.

  Next, the operation of the present embodiment having the above-described configuration will be described.

  According to the sealing device 1 of the present embodiment, since the garter spring 37 is mounted in the mounting recess 35 in an elastically deformed state contracted in the axial direction, the elasticity of the garter spring 37 contracted in the axial direction causes the seal lip 32 to move. The force that the lip tip 32a is in close contact with the seal contact surface 15 of the slinger 3 can be stably applied.

  That is, according to the sealing device 1 of the present embodiment, even if the elasticity of the seal lip 32 itself (deterioration of rubber, creep of fluororesin) occurs over time, the lip is generated by the elasticity of the garter spring 37. Since the tip 32a can be pressed against the seal contact surface 15 of the slinger 3, the sealing margin CF of the lip tip 32a with respect to the seal contact surface 15 is reduced, that is, the seal contact of the lip tip 32a is reduced due to the decrease in elasticity of the seal lip itself. It is possible to reliably prevent a decrease in the tension force on the contact surface 15. As a result, since the force with which the lip tip 32a is in close contact with the seal contact surface 15 can be stably applied, a stable sealing performance can be ensured over a long period of time.

  Moreover, according to the sealing device 1 of this embodiment, since the elastic member 6 is the garter spring 37, the elastic member 6 can be formed easily and the elastic member 6 can be made into a simple structure.

  Further, according to the sealing device 1 of the present embodiment, when the seal body 22 is formed of a rubber-like elastic body, the seal body 22 can be baked on the mounting body 21 and integrally molded. Can be improved. In addition, when the seal body 22 is made of a fluororesin, it is possible to more reliably prevent a decrease in the fastening allowance CF due to wear compared to the lip tip 32a of the seal lip 32 formed of a rubber-like elastic body. In addition, it is possible to easily reduce torque by imparting low friction characteristics.

  Further, according to the sealing device 1 of the present embodiment, when a screw that exhibits a pump action is formed on the seal surface 34 or the seal contact surface 15 of the seal lip 32, the screw that exhibits the pump action is sealed. Since the fluid that is about to leak from the side SS to the atmosphere side AS can be returned to the sealing side SS, the sealing performance can be improved.

  FIG. 3 is an enlarged sectional view showing a main part of a second embodiment of the sealing device according to the present invention. The sealing device 1A of the present embodiment is obtained by changing the mounting recess 35 in the sealing device 1 of the first embodiment described above.

  That is, the sealing device 1A of the present embodiment does not have the pressure receiving portion 33 in the sealing device 1 of the first embodiment described above, and is opposed to the back surface 32b of the seal lip 32 and the back surface 32b as shown in FIG. A mounting recess 35A for mounting the garter spring 37 in a contracted state in the axial direction is provided between the connecting flat plate portion 26 of the mounting ring 23 and the surface 26a on the sealing side SS.

  Accordingly, the mounting recess 35 </ b> A in the present embodiment is formed by the seal body 22 and the mounting ring 23. Of course, the mounting recess 35 </ b> A in the present embodiment is provided on the seal member 5 and on the back side of the seal lip 32.

  Other configurations are the same as those of the sealing device 1 of the first embodiment described above, and a detailed description thereof is omitted.

  With such a configuration, the sealing device 1A of the present embodiment can achieve the same effects as the sealing device 1 of the first embodiment described above, and is provided with the pressure receiving portion 33 in the sealing device 1 of the first embodiment. Since the space required for forming the pressure receiving portion 33 can be omitted because the configuration is not, the size and weight can be reduced as compared with the sealing device 1 of the first embodiment described above. Can do. Note that miniaturization is to reduce the size in the axial direction.

  FIG. 4 is an enlarged sectional view showing a main part of a third embodiment of the sealing device according to the present invention. The sealing device 1B of the present embodiment is obtained by changing the elastic member 6 in the sealing device 1 of the first embodiment described above.

  That is, the sealing device 1B of the present embodiment is configured such that, as the elastic member 6, the radially outer side is opened by an elastic plate such as a leaf spring, as shown in FIG. 4, instead of the garter spring 37 in the first embodiment described above. A V-ring 38 formed in an annular shape having a V-shaped cross section is used. The axial size of the open end of the V ring 38 in a free state (not shown) is formed larger than the axial size of the open end of the mounting recess 35.

  Other configurations are the same as those of the sealing device 1 of the first embodiment described above, and a detailed description thereof is omitted.

  With such a configuration, the sealing device 1B of the present embodiment can achieve the same effects as the sealing device 1 of the first embodiment described above.

  FIG. 5 is an enlarged sectional view showing a main part of a fourth embodiment of the sealing device according to the present invention. The sealing device 1C of the present embodiment is obtained by changing the elastic member 6 and the mounting recess 35 in the sealing device 1 of the first embodiment described above.

  That is, in the sealing device 1C of the present embodiment, as shown in FIG. 5, instead of the garter spring 37 in the first embodiment described above, an elastic plate such as a leaf spring is used as the elastic member 6 to open the radial center side. An inverted U-ring 39 formed in an annular shape having a U-shaped cross section is used. The mounting recess 35C includes a back surface 32c extending outward in the radial direction of the seal lip 32, a surface 33c extending outward in the radial direction on the sealing side SS of the pressure receiving portion 33, and an outer periphery of the base 31. The surface is formed into a U-shaped cross section with the radially outer side being an opening. The mounting recess 35 </ b> C is provided integrally with the seal body 22 and is provided on the back side of the seal lip 32.

  The axial size of the open end of the reverse U-ring 39 in a free state (not shown) is formed to be larger than the axial size of the open end of the mounting recess 35C, and the reverse U-ring 39 is elastically deformed in the axial direction. In the state, it has an inverted U-shaped cross section, and is mounted on the mounting recess 35C in a state of an inverted U-shaped cross section.

  Other configurations are the same as those of the sealing device 1 of the first embodiment described above, and a detailed description thereof is omitted.

  With such a configuration, the sealing device 1 </ b> C of the present embodiment can achieve the same effects as the sealing device 1 of the first embodiment described above.

  In addition, this invention is not limited to each embodiment mentioned above, A various change is possible as needed.

  For example, in the sealing device 1 of the present invention, the lip tip of the seal lip is attached to the atmosphere side, that is, the slinger and the seal member are reversed left and right along the axial direction with respect to the rotating shaft and the housing. It can be used as a dust seal that exhibits a sealing property of preventing entry of foreign matter such as dust and muddy water from the atmosphere side toward the sealed side.

  Further, the sealing device of the present invention may be configured such that the slinger and the seal member are reversed in the radial direction around the rotation axis. By setting it as such a structure, it can be used for the sealing location where a rotation member is arrange | positioned on the outer side and a fixing member is arrange | positioned on the inner side.

DESCRIPTION OF SYMBOLS 1, 1A, 1B, 1C Sealing device 2 Rotating shaft 3 Slinger 4 Housing 5 Seal member 6 Elastic member 11 Slinger main body 13 Mounting base part 14 Flat plate part 15 Seal contact surface 21 Mounting main body 22 Sealing body 32 Seal lip 32a Lip tip 35 , 35A, 35C Mounting recess 37 Garter spring 38 V ring 39 Reverse U ring CF (with respect to the seal abutment surface of the lip tip) SS Sealing side AS Atmosphere side

Claims (4)

A slinger attached to one of the two members that rotate relative to each other, and a seal member attached to the other member;
The slinger has an annular flat plate portion extending in a radial direction toward the other member, and a seal contact surface is provided on one surface of the flat plate portion,
The seal member has an attachment main body attached to the other member, and a seal main body fixed to the attachment main body.
In the sealing device having an annular seal lip having a lip tip slidably in close contact with the seal contact surface with a preset tightening allowance,
It has an elastic member that is formed in an annular shape and is elastically deformable in an axial direction perpendicular to the radial direction of the ring,
The seal member includes a mounting recess formed in an annular shape on the back side of the seal lip and mounted in an elastically deformed state in which the elastic member contracts in the axial direction.
The seal member is formed to press the tip of the lip toward the seal contact surface with the elasticity of the elastic member when the elastic member is mounted in the mounting recess in the elastically deformed state. A sealing device characterized by.   The sealing device according to claim 1, wherein the elastic member is a garter spring.   The sealing device according to claim 1 or 2, wherein the seal main body is formed of a rubber-like elastic body or a fluororesin.   The sealing device according to any one of claims 1 to 3, wherein a screw that exhibits a pump action is formed on a seal surface of the seal lip or the seal contact surface.

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