Sealing device

Abstract

The present invention provides a sealing device that can suppress the complexity and enlargement of the sealing device and improve the function of preventing foreign matter from intruding. The sealing device (10) is a device for sealing an annular gap (S) formed between a housing (91) and a shaft (92) inserted into the housing (91) and rotating relative to the housing (91). The sealing device (10) includes: an annular first sealing portion (1) that rotates together with the shaft (92); and an annular second sealing portion (2) that contacts the first sealing portion (1) and is fixed to the housing (91). The first sealing portion (1) includes: a rubber elastic portion (11) having rubber elasticity; and a wear-resistant portion (12) having rubber elasticity, whose wear resistance is higher than that of the rubber elastic portion (11) and is in contact with the second sealing portion (2).

Description

Technical Field

[0001] The present invention relates to sealing devices. Background Art

[0002] For example, a sealing device is used on an axle of an agricultural machine, etc. The sealing device is, for example, an oil seal that seals a gap between the axle and a housing surrounding the axle.

[0003] The sealing device described in Patent Document 1 includes a first sealing portion that rotates integrally with the shaft and a second sealing portion that is fixed to the housing. The first sealing portion and the second sealing portion each have a plurality of dust lips. The presence of the plurality of dust lips can improve the function of preventing foreign matter such as muddy water from intruding into the housing.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2003-106464. Summary of the invention

[0007] In order to further improve the function of preventing foreign matter from entering, it is possible to consider increasing the number of dust lips. In addition, it is possible to consider setting a complex labyrinth structure on the sealing device. However, since the gap between the shaft and the housing is limited, it is sometimes difficult to increase the number of dust lips. Therefore, there is a problem that it is difficult to improve the function of preventing foreign matter from entering while suppressing the complexity and enlargement of the sealing device.

[0008] In order to solve the above-mentioned problem, a sealing device involved in one embodiment of the present invention is a sealing device that seals an annular gap formed between a shell and a shaft inserted into the shell and rotating relative to the shell, the sealing device including: an annular first sealing portion that rotates together with the shaft; and an annular second sealing portion that contacts the first sealing portion and is fixed to the shell, the first sealing portion including: a rubber-like elastic portion having rubber-like elasticity; and a wear-resistant portion having rubber-like elasticity, whose wear resistance is higher than that of the rubber-like elastic portion and is in contact with the second sealing portion.

[0009] In the present invention, since a portion of the sealing device includes a portion having wear resistance, it is possible to improve the function of preventing the intrusion of foreign matter while suppressing the complication and enlargement of the sealing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a cross-sectional view showing a sealing device according to a first embodiment;

[0011] Figure 2 is a cross-sectional view showing a sealing device according to a second embodiment;

[0012] Figure 3 is a cross-sectional view showing a sealing device according to a third embodiment;

[0013] Figure 4 is a cross-sectional view showing a sealing device according to a fourth embodiment;

[0014] Figure 5 It is a cross-sectional view showing a sealing device according to a fifth embodiment. DETAILED DESCRIPTION

[0015] Hereinafter, the preferred embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in the accompanying drawings, the size and scale of each part are appropriately different from the actual ones, and some parts are schematically shown for easy understanding. In addition, the scope of the present invention is not limited to these modes as long as there is no special description of the content of the present invention in the following description.

[0016] 1. First Implementation

[0017] 1-1. Rotating mechanism 900

[0018] Figure 1 2 is a cross-sectional view showing the sealing device 100 according to the first embodiment. In the following, a direction from an arbitrary point toward the upper side in the drawing is referred to as an "X1 direction", and a direction from an arbitrary point toward the lower side in the drawing is referred to as an "X2 direction".

[0019] Figure 1 The sealing device 100 shown is an oil seal that prevents leakage of oil or the like used in a machine and prevents intrusion of foreign matter from the outside. Figure 1 The figure shows a rotating mechanism 900 having a sealing device 100. The rotating mechanism 900 is a mechanism of a machine such as an agricultural machine. Specifically, for example, the rotating mechanism 900 is a mechanism provided around the foot of an agricultural machine such as a tractor or a tiller, and includes a shaft 92 such as an axle and a bearing. Figure 1 As shown, the rotating mechanism 900 has a housing 91 , a shaft 92 , and a sealing device 100 .

[0020] The housing 91 has, for example, a cylindrical internal space. The housing 91 has an inner peripheral surface 910, and the internal space is a space surrounded by the inner peripheral surface 910. In the internal space, for example, a bearing (not shown) is arranged, and a lubricant such as grease and oil for lubricating the bearing is filled. Specifically, the bearing and the lubricant are arranged in the internal space along the X2 direction relative to the sealing device 100.

[0021] The shaft 92 is a component that rotates around the axis AX. The shaft 92 is inserted into the housing 91 and rotates relative to the housing 91. The shape of the shaft 92 is, for example, a column or a cylinder. The shaft 92 is supported by the housing 91 via a bearing (not shown) so as to be rotatable around the axis AX. In addition, the shaft 92 has an outer peripheral surface 920. The diameter of the outer peripheral surface 920 is smaller than the diameter of the inner peripheral surface 910 of the housing 91. Therefore, an annular gap S is formed between the outer peripheral surface 920 and the inner peripheral surface 910. A sealing device 100 is arranged in the gap S.

[0022] The sealing device 100 is an annular component. The sealing device 100 is pressed between the inner circumferential surface 910 of the housing 91 and the outer circumferential surface 920 of the shaft 92. The sealing device 100 allows the shaft 92 to rotate relative to the housing 91 while sealing the annular gap S. By sealing the gap S with the sealing device 100, it is possible to prevent the lubricant from leaking from the housing 91 and foreign matter such as dust or muddy water from entering the housing 91.

[0023] Although not shown in detail, by arranging the sealing device 100 in the gap S, a closed space is formed in the internal space of the housing 91 in the X2 direction relative to the sealing device 100. On the other hand, the area in the X1 direction relative to the sealing device 100 is, for example, the atmosphere. Here, the X1 direction coincides with the direction from any point along the axis AX toward the atmosphere, and the X2 direction coincides with the direction from any point along the axis AX toward the interior of the housing 91.

[0024] In addition, the shape of the shaft 92 is not limited to a cylinder or a column. Similarly, the shape of the inner space of the housing 91 is not limited to a cylinder. For example, the shaft 92 may have a plurality of portions with different widths.

[0025] 1-2. Sealing device 100

[0026] like Figure 1 As shown, the sealing device 100 includes an annular first sealing portion 1 and an annular second sealing portion 2. The first sealing portion 1 is fixed to the shaft 92 and rotates together with the shaft 92. The second sealing portion 2 is fixed to the housing 91. In addition, the first sealing portion 1 is in contact with the second sealing portion 2 and slides relative to the second sealing portion 2 as the shaft 92 rotates. The following describes the various elements of the sealing device 100.

[0027] 1-2a. Second sealing portion 2

[0028] As described above, the second sealing portion 2 includes an annular reinforcement ring 20, an annular flange 23, and an annular second elastic body 25. The reinforcement ring 20 is a component that reinforces the second elastic body 25 and fixes the second elastic body 25 to the housing 91. The material of the reinforcement ring 20 is, for example, a metal such as stainless steel or SPCC (cold rolled steel). The reinforcement ring 20 is formed, for example, by stamping.

[0029] The reinforcement ring 20 has a barrel portion 20a, a flange portion 20b and a fixing portion 20c. The barrel portion 20a is a cylindrical portion extending in the direction of the axis AX. The flange portion 20b is located in the X2 direction relative to the barrel portion 20a, and is a portion extending from the end of the barrel portion 20a toward the shaft 92. A portion of the flange portion 20b is bent obliquely to the upper right in the figure. The fixing portion 20c is located in the X1 direction relative to the barrel portion 20a, and is a portion disposed on the surface of the housing 91 in contact with the atmosphere. The fixing portion 20c has a recessed portion for fixing the flange 23 to the reinforcement ring 20 by riveting, for example.

[0030] In addition, the shape of the reinforcement ring 20 is not limited to Figure 1 The shape shown may be, for example, a shape in which the flange portion 20b is omitted. In addition, the reinforcement ring 20 may be provided or omitted as required.

[0031] The flange 23 is an annular component that exists in the sealing device 100 and is closest to the atmosphere and contacts the first sealing portion 1. The flange 23 is fixed to the fixing portion 20c and extends from the fixing portion 20c toward the shaft 92. A portion of the flange 23 is bent toward the X2 direction. Therefore, the flange 23 includes a portion 23a having a surface in contact with the atmosphere and a portion 23b facing the shaft 92. The material of the flange 23 is, for example, a metal such as stainless steel or SPCC. The flange 23 is formed, for example, by stamping.

[0032] The second elastic body 25 is an annular member joined to the reinforcement ring 20. In the example shown in the figure, the second elastic body 25 is joined to the cylindrical portion 20a and the flange portion 20b of the reinforcement ring 20. The second elastic body 25 has a portion located between the cylindrical portion 20a of the reinforcement ring 20 and the housing 91, and is in close contact with the inner peripheral surface 910 of the housing 91. The second elastic body 25 is joined to the reinforcement ring 20 by, for example, cross-linking. In addition, the second elastic body 25 may also be joined to the reinforcement ring 20 by, for example, an adhesive.

[0033] The second elastic body 25 is made of a material having rubber-like elasticity. The material is a rubber material or a synthetic resin material having rubber-like elasticity. Specifically, as the material of the second elastic body 25, for example, rubber materials such as nitrile rubber, acrylic rubber, and silicone rubber can be cited.

[0034] The second elastic body 25 has a sealing lip 251 and a plurality of dustproof lips 253, 254, and 255. In addition, the second sealing portion 2 has a spring 27. The sealing lip 251 has a function of preventing the lubricant from leaking from the housing 91. The sealing lip 251 contacts the first sealing portion 1 in an elastically deformed state and is pressed toward the shaft 92 by the spring 27. The spring 27 is made of a spring steel material such as stainless steel, for example. In addition, the dustproof lips 253 to 255 each have a function of preventing foreign matter from invading the inside of the housing 91 from the outside. The dustproof lips 253 to 255 are respectively present in the X1 direction relative to the sealing lip 251 and are in contact with the first sealing portion 1 in an elastically deformed state.

[0035] The shape of the sealing lip 251 is not limited to any shape as long as it can prevent the lubricant from leaking from the housing 91. Figure 2 The shape shown in the figure may be any shape. In addition, the shape of each of the dust lips 253 to 255 is not limited to any shape as long as it can prevent foreign matter from entering the housing 91. Figure 1 The shape shown may be any shape. In addition, the number of dust lips included in the second sealing portion 2 is not limited to four, and may be, for example, 1 to 3.

[0036] 1-2b. First sealing portion 1

[0037] like Figure 1 As shown, the first sealing portion 1 has an annular sleeve 10 and an annular first elastomer 15. The sleeve 10 is a component that surrounds the shaft 92 in the circumferential direction. The material of the sleeve 10 is, for example, a metal such as stainless steel or SPCC. The sleeve 10 is formed, for example, by stamping. The sleeve 10 has a barrel 10a and a flange 10b. The barrel 10a is a cylindrical portion extending in the direction of the axis AX. The flange 10b is a portion that is located in the X1 direction relative to the barrel 10a and extends from the end of the barrel 10a toward the housing 91. In addition, the flange 10b is located in the X1 direction relative to the flange 20b of the reinforcement ring 20, and is located in the X2 direction relative to the flange 23.

[0038] The first elastic body 15 is an annular member joined to the sleeve 10. The first elastic body 15 is made of a material having rubber elasticity, and a part of the first elastic body 15 is more wear-resistant than other parts. Therefore, the first elastic body 15 has a rubber elastic portion 11 and a wear-resistant portion 12.

[0039] The rubber-like elastic part 11 has rubber-like elasticity. Specifically, the material of the rubber-like elastic part 11 may be, for example, a rubber material such as nitrile rubber, acrylic rubber, and silicone rubber. The rubber-like elastic part 11 is, for example, cross-linked and bonded to the sleeve 10 .

[0040] The rubber-like elastic portion 11 has a first portion 11a and a second portion 11b. The first portion 11a is located between the barrel portion 10a of the sleeve 10 and the shaft 92. Specifically, the first portion 11a is in close contact with the inner circumferential surface of the barrel portion 10a. The second portion 11b is engaged with the flange portion 10b of the sleeve 10. In addition, the second portion 11b has a plurality of dust lips 111 and 112. The dust lips 111 and 112 each have a function of preventing foreign matter from invading the inside of the housing 91 from the outside. The dust lips 111 and 112 are respectively present in the X1 direction relative to the flange portion 10b of the sleeve 10, and are in contact with the flange 23 of the second sealing portion 2 in an elastically deformed state.

[0041] In addition, the shapes of the dust lips 111 and 112 are not limited to any shapes as long as they can prevent foreign matter from entering the housing 91. Figure 1 The shape shown may be any shape. In addition, the number of dust lips included in the first sealing portion 1 is not limited to two, and may be one, for example.

[0042] The wear-resistant portion 12 is an annular member having higher wear resistance than the rubber elastic portion 11. The wear-resistant portion 12 is formed separately from the rubber elastic portion 11, but may be formed integrally. The wear-resistant portion 12 has a portion located between the outer peripheral surface 920 of the shaft 92 and the second sealing portion 2, and contacts these portions.

[0043] The wear-resistant portion 12 has rubber-like elasticity and is made of a material different from that of the rubber-like elastic portion 11. Examples of the material of the wear-resistant portion 12 include synthetic resins such as polyurethane and PTFE (Poly Tetra Fluoro Ethylene: tetrafluoroethylene resin).

[0044] The wear-resistant portion 12 includes a dust lip 12a and a fastening portion 12b. The dust lip 12a is located between the flange 23 of the second sealing portion 2 and the shaft 92. The dust lip 12a contacts the flange 23 in an elastically deformed state. In particular, the dust lip 12a of the wear-resistant portion 12 contacts a portion of the flange 23 that faces the shaft 92. The dust lip 12a has a function of preventing foreign matter and the like from entering the interior of the housing 91 from the outside.

[0045] The shape of the dust lip 12a is not limited to any shape as long as it can prevent foreign matter from entering the housing 91. Figure 1 The shapes shown can be any shapes.

[0046] The fastening portion 12b is located between the barrel portion 10a of the sleeve 10 and the shaft 92, and is in close contact with the inner circumferential surface of the barrel portion 10a. The fastening portion 12b is used to fix the dust lip 12a to the sleeve 10. By pressing the fastening portion 12b into the sleeve 10, the wear-resistant portion 12 is fixed relative to the sleeve 10. Specifically, the above-mentioned rubber-like elastic portion 11 is cross-linked and bonded to the sleeve 10, and then the fastening portion 12b of the wear-resistant portion 12 is pressed into the sleeve 10. According to this method, compared with the case where the wear-resistant portion 12 is cross-linked and bonded to the sleeve 10 after the rubber-like elastic portion 11 is cross-linked and bonded to the sleeve 10, the bonding process becomes easy, so the wear-resistant portion 12 can be easily fixed to the sleeve 10.

[0047] In addition, the sealing device 100 is sandwiched between the inner peripheral surface 910 and the outer peripheral surface 920, and is fixed to the inner peripheral surface 910 in a state where the first elastic body 15 is elastically deformed, and is fixed to the outer peripheral surface 920 in a state where the second elastic body 25 is elastically deformed. In addition, the position of the sealing device 100 in the X2 direction is fixed by the fixing portion 20c of the second sealing portion 2 abutting against the surface of the housing 91 that contacts the atmosphere.

[0048] As described above, the first elastic body 15 of the first sealing part 1 includes a rubber-like elastic part 11 and a wear-resistant part 12 having a higher wear resistance than the rubber-like elastic part 11. Moreover, the wear-resistant part 12 is in contact with the second sealing part 2. In the present embodiment, the wear-resistant part 12 is in contact with the shaft 92 and the flange 23, respectively, and slides relative to the flange 23. Moreover, the wear-resistant part 12 slides relative to the second sealing part 2 as the shaft 92 rotates. Since the wear resistance of the wear-resistant part 12 is higher than that of the rubber-like elastic part 11, the durability of the sealing device 100 can be improved compared with the past by having the wear-resistant part 12 at the position sliding relative to the second sealing part 2. Therefore, the function of preventing foreign matter from intruding into the housing 91 can be maintained for a long time. In addition, the leakage of the lubricant from the housing 91 can be suppressed for a long time.

[0049] In addition, by making the material of the wear-resistant portion 12 different from the material of the rubber-like elastic portion 11, the wear resistance of the wear-resistant portion 12 can be easily improved. Therefore, even without increasing the number of dust lips or forming a complicated labyrinth structure, it is possible to effectively suppress the intrusion of foreign matter into the housing 91 for a long time. Moreover, even without increasing the number of flanges 23 or complicating the structure of the flanges 23, it is possible to suppress the intrusion of foreign matter into the housing 91 for a long time. Therefore, according to the sealing device 100, even without increasing the number of components constituting the sealing device 100 or complicating the structure of the sealing device 100, it is possible to suppress the intrusion of foreign matter into the housing 91. Therefore, according to the sealing device 100, it is possible to suppress the complication and enlargement of the sealing device 100, and it is possible to suppress the intrusion of foreign matter into the housing 91 and the leakage of lubricant from the housing 91 for a long time. Therefore, it is possible to provide a sealing device 100 that can adapt to gaps S of various sizes.

[0050] 2. Second Implementation

[0051] In the following exemplary embodiment, the elements having the same effects or functions as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed descriptions thereof are omitted as appropriate.

[0052] Figure 2 It is a cross-sectional view showing a sealing device 100A according to the second embodiment. Figure 2 The sealing device 100A shown in the figure is different from the sealing device 100 of the first embodiment in that it includes an annular member 13 . Figure 2 The annular member 13 shown is an annular member made of metal such as stainless steel or SPCC, for example. The annular member 13 is formed by, for example, press working.

[0053] The wear-resistant portion 12 is bridged and joined to the annular member 13. By pressing the annular member 13 into the sleeve 10, the wear-resistant portion 12 is fixed to the sleeve 10. According to this method, the annular member 13 can be stably fixed to the sleeve 10. In addition, the annular member 13 can also be joined to the sleeve 10 by an adhesive, for example.

[0054] In addition, the presence of the annular member 13 can enhance the rigidity of the wear-resistant portion 12. Therefore, since the durability of the wear-resistant portion 12 can be improved, the durability of the sealing device 100A can be further improved. Therefore, the intrusion of foreign matter into the housing 91 and the leakage of lubricant from the housing 91 can be suppressed for a long time.

[0055] According to the sealing device 100A of the second embodiment described above, similarly to the sealing device 100 of the first embodiment, it is possible to suppress the complication and size increase of the sealing device 100A and to suppress the intrusion of foreign matter into the housing 91 for a long period of time.

[0056] 3. Third Implementation

[0057] In the following exemplary embodiment, the elements having the same effects or functions as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed descriptions thereof are omitted as appropriate.

[0058] Figure 3 It is a cross-sectional view showing a sealing device 100B according to a third embodiment. Figure 3 The sealing device 100B shown is different from the sealing device 100 of the first embodiment in that it has a first sealing portion 1B instead of the first sealing portion 1. In addition, regarding the first sealing portion 1B, description of matters similar to the first sealing portion 1 of the first embodiment will be omitted as appropriate.

[0059] like Figure 3 As shown, the first seal portion 1B has a wear-resistant portion 12B instead of the wear-resistant portion 12 of the first embodiment. The first seal portion 1B has a rubber-like elastic portion 11B and a wear-resistant portion 12B.

[0060] The rubber elastic portion 11B has a dust lip 115 and a holding portion 113. The dust lip 115 is the same as the dust lip 12a of the first embodiment except that the material is different. The dust lip 115 is a part of the rubber elastic portion 11B, and the material of the dust lip 115 may not have better wear resistance than the material of the wear-resistant portion 12B.

[0061] The retaining portion 113 protrudes from the flange portion 10b of the sleeve 10 toward the flange 23. The retaining portion 113 retains the wear-resistant portion 12B so as to restrict radial movement centered on the axis AX of the wear-resistant portion 12B. In addition, the retaining portion 113 has a portion that is bent in a manner to retain the wear-resistant portion 12B. Therefore, the wear-resistant portion 12B rotates following the rubber-like elastic portion 11B. Therefore, the wear-resistant portion 12B rotates together with the rubber-like elastic portion 11B having the retaining portion 113 as the shaft 92 rotates.

[0062] The wear-resistant portion 12B is an annular dust seal disposed between the sleeve 10 and the flange 23. In addition, the wear-resistant portion 12B is held by the retaining portion 113 and the portion 23b, and is in close contact with the retaining portion 113, and further contacts with the portion 23b of the flange 23. The wear-resistant portion 12B has a function of preventing foreign matter and the like from invading the inside of the housing 91 from the outside. In addition, the wear-resistant portion 12B slides relative to the flange 23 as the shaft 92 rotates. In addition, the wear resistance of the wear-resistant portion 12B is higher than that of the rubber-like elastic portion 11B. Therefore, by having the wear-resistant portion 12B in the portion that slides relative to the flange 23, the durability of the sealing device 100 can be improved compared to the past.

[0063] The wear-resistant portion 12B is in a corrugated shape. That is, the wear-resistant portion 12B is a structure formed by folding a flat plate-like member multiple times. The wear-resistant portion 12B is configured to be able to expand and contract in a direction orthogonal to the axis AX. By making the wear-resistant portion 12B in a corrugated shape, the ability to follow the eccentricity of the shaft 92 can be improved. Therefore, the sealing performance based on the wear-resistant portion 12B can be improved.

[0064] The sealing device 100B has a retaining portion 113 and a wear-resistant portion 12B instead of the dust lip 112 of the first embodiment. Therefore, in this embodiment, as in the first embodiment, the number of components constituting the sealing device 100B does not need to be increased and the structure of the sealing device 100B does not need to be complicated, and foreign matter intrusion can be suppressed for a long time.

[0065] According to the sealing device 100B of the third embodiment described above, similarly to the sealing device 100 of the first embodiment, it is possible to suppress the complication and size increase of the sealing device 100B and to suppress the intrusion of foreign matter into the housing 91 for a long period of time.

[0066] 4. Fourth Implementation

[0067] In the following exemplary embodiment, the elements having the same effects or functions as those in the third embodiment are given the same reference numerals as those in the third embodiment, and detailed descriptions thereof are omitted as appropriate.

[0068] Figure 4 It is a cross-sectional view showing a sealing device 100C according to a fourth embodiment. Figure 4 The sealing device 100C shown here is different from the sealing device 100B of the third embodiment in that the first sealing portion 1C has a wear-resistant portion 12C and a retaining portion 113C. In addition, regarding the first sealing portion 1C, the description of the same matters as the first sealing portion 1B of the third embodiment will be appropriately omitted.

[0069] like Figure 4As shown, the rubber-like elastic portion 11C of the first sealing portion 1C includes a retaining portion 113C that retains the wear-resistant portion 12C. The retaining portion 113C is a convex portion that protrudes from the flange portion 10b of the sleeve 10 toward the flange 23. The retaining portion 113C retains the wear-resistant portion 12C so as to restrict radial movement centered on the axis AX of the wear-resistant portion 12C. Therefore, the wear-resistant portion 12C rotates following the rubber-like elastic portion 11C. Therefore, the wear-resistant portion 12C rotates together with the rubber-like elastic portion 11C having the retaining portion 113C as the shaft 92 rotates.

[0070] The wear-resistant portion 12C is an annular dust seal disposed between the sleeve 10 and the flange 23. The wear-resistant portion 12C is held by the retaining portion 113C and the flange 23, and is in close contact with the retaining portion 113C, and further contacts with the flange 23. The wear-resistant portion 12C slides relative to the flange 23 as the shaft 92 rotates. In addition, the wear resistance of the wear-resistant portion 12C is higher than that of the rubber-like elastic portion 11C. Therefore, by having the wear-resistant portion 12C at a position that slides relative to the flange 23, the durability of the sealing device 100C can be improved compared to the past.

[0071] The wear-resistant portion 12C is in a corrugated shape. The wear-resistant portion 12C is configured to be able to expand and contract in the direction along the axis AX. By making the wear-resistant portion 12C in a corrugated shape, the ability to follow the eccentricity of the shaft 92 can be improved. Therefore, the sealing performance based on the wear-resistant portion 12C can be improved.

[0072] In addition, the sealing device 100C includes a holding portion 113C and a wear-resistant portion 12C instead of the dust lip 112 of the first embodiment. Therefore, in this embodiment, as in the first embodiment, the intrusion of foreign matter can be suppressed for a long period of time without increasing the number of components constituting the sealing device 100C or complicating the structure of the sealing device 100C.

[0073] According to the sealing device 100C of the fourth embodiment described above, similarly to the sealing device 100 of the first embodiment, it is possible to suppress the complication and size increase of the sealing device 100C and to suppress the intrusion of foreign matter into the housing 91 for a long period of time.

[0074] 5. Fifth Implementation

[0075] In the following exemplary embodiment, the elements having the same effects or functions as those in the third embodiment are given the same reference numerals as those in the third embodiment, and detailed descriptions thereof are omitted as appropriate.

[0076] Figure 5 It is a cross-sectional view showing a sealing device 100D according to a fifth embodiment. Figure 5The sealing device 100D shown in the figure is different from the sealing device 100B of the third embodiment in that the retaining portion 113D of the rubber-like elastic portion 11D has a first engaging portion 114, and the wear-resistant portion 12D has a second engaging portion 124. In addition, regarding the rubber-like elastic portion 11D, the description of the same items as the rubber-like elastic portion 11B of the third embodiment is appropriately omitted. In addition, regarding the wear-resistant portion 12D, the description of the same items as the wear-resistant portion 12B of the third embodiment is appropriately omitted.

[0077] like Figure 5 As shown, the holding portion 113D has a first engaging portion 114, and the wear-resistant portion 12D has a second engaging portion 124. The first engaging portion 114 is a recessed portion formed in the holding portion 113D. The recessed portion is formed in a manner extending circumferentially over the entire circumference of the holding portion 113D. The second engaging portion 124 is a convex portion formed in the wear-resistant portion 12D, and engages with the first engaging portion 114. The convex portion is formed in a manner extending circumferentially over the entire circumference of the wear-resistant portion 12D.

[0078] The wear-resistant portion 12D is stably fixed to the rubber elastic portion 11D by the presence of the first engaging portion 114 and the second engaging portion 124. Therefore, the wear-resistant portion 12D rotates together with the rubber elastic portion 11D having the retaining portion 113D as the shaft 92 rotates. In addition, since the wear-resistant portion 12D slides relative to the flange 23 as the shaft 92 rotates, the wear-resistant portion 12D can effectively suppress the intrusion of foreign matter into the housing 91.

[0079] In addition, in the example shown in the figure, the first engaging portion 114 is a concave portion and the second engaging portion 124 is a convex portion, but it may also be that the first engaging portion 114 is a convex portion and the second engaging portion 124 is a concave portion. In addition, the number of groups of the first engaging portion 114 and the second engaging portion 124 is not limited to one, and may also be multiple. In addition, in the case where there are multiple first engaging portions 114, for example, the multiple first engaging portions 114 can be formed at intervals in the circumferential direction of the retaining portion 113D. Similarly, in the case where there are multiple second engaging portions 124, for example, the multiple second engaging portions 124 can be formed at intervals in the circumferential direction of the wear-resistant portion 12D. At this time, the multiple second engaging portions 124 are set one-to-one with the multiple second engaging portions 124.

[0080] According to the sealing device 100D of the fifth embodiment described above, similarly to the sealing device 100 of the first embodiment, it is possible to suppress the complication and size increase of the sealing device 100D and to suppress the intrusion of foreign matter into the housing 91 for a long period of time.

[0081] The present invention has been described above based on preferred embodiments, but the present invention is not limited to the above embodiments. In addition, the structure of each part of the present invention can be replaced with any structure that performs the same function as the above embodiments, and any structure can be added. In addition, any structure of the above embodiments can also be combined with each other.

[0082] Explanation of symbols

[0083] 1…first sealing portion, 2…second sealing portion, 10…sleeve, 10a…cylindrical portion, 10b…flange portion, 10c…fixing portion, 11…rubber-like elastic portion, 11a…first portion, 11b…second portion, 12…wear-resistant portion, 12a…dust lip, 12b…fastening portion, 13…ring-shaped member, 15…first elastic body, 20…reinforcement ring, 20a…cylindrical portion, 20b…flange portion, 20 c…fixing part, 23…flange, 25…second elastic body, 27…spring, 91…housing, 92…shaft, 100…sealing device, 111…dustproof lip, 112…dustproof lip, 113…holding part, 251…sealing lip, 253…dustproof lip, 254…dustproof lip, 255…dustproof lip, 900…rotating mechanism, 910…inner circumference, 920…outer circumference, AX…axis line, S…gap.

Claims

1. A sealing device for sealing an annular gap formed between a housing and a shaft, wherein the shaft is inserted into the housing and rotates relative to the housing, the sealing device comprising: an annular first sealing portion, rotating together with the shaft; as well as an annular second sealing portion, in contact with the first sealing portion and fixed to the housing, The first sealing portion comprises: The rubber-like elastic part has rubber-like elasticity; a wear-resistant portion having rubber-like elasticity, having higher wear resistance than the rubber-like elastic portion, and contacting the second sealing portion; and an annular sleeve, engaged with the rubber-like elastic portion and surrounding the shaft, The second sealing portion has an annular flange, The flange has a portion facing the shaft, The wear-resistant portion includes a fastening portion located between the shaft and the sleeve, and a dust lip that contacts a portion of the flange of the second seal portion that faces the shaft.

2. The sealing device according to claim 1, wherein: The wear-resistant portion contacts the flange and slides relative to the flange.

3. The sealing device according to claim 2, wherein: The first sealing portion further includes an annular member that is press-fitted into the sleeve and cross-linked and bonded to the wear-resistant portion.

4. A sealing device for sealing an annular gap formed between a housing and a shaft, wherein the shaft is inserted into the housing and rotates relative to the housing, the sealing device comprising: an annular first sealing portion, rotating together with the shaft; as well as an annular second sealing portion, in contact with the first sealing portion and fixed to the housing, The first sealing portion comprises: The rubber-like elastic part has rubber-like elasticity; as well as a wear-resistant portion having rubber-like elasticity, having higher wear resistance than the rubber-like elastic portion and contacting the second sealing portion, The first sealing portion includes an annular sleeve engaged with the rubber elastic portion. The second sealing portion has an annular flange in contact with the first sealing portion, The wear-resistant portion is arranged between the sleeve and the flange, The rubber-like elastic portion has a holding portion for holding the wear-resistant portion, The holding portion has a first engaging portion, The wear-resistant portion includes a second engagement portion that engages with the first engagement portion.

5. A sealing device for sealing an annular gap formed between a housing and a shaft, wherein the shaft is inserted into the housing and rotates relative to the housing, the sealing device comprising: an annular first sealing portion, rotating together with the shaft; as well as an annular second sealing portion, in contact with the first sealing portion and fixed to the housing, The first sealing portion comprises: The rubber-like elastic part has rubber-like elasticity; as well as a wear-resistant portion having rubber-like elasticity, having higher wear resistance than the rubber-like elastic portion and contacting the second sealing portion, The first sealing portion includes an annular sleeve engaged with the rubber elastic portion. The second sealing portion has an annular flange in contact with the first sealing portion, The wear-resistant portion is arranged between the sleeve and the flange, The rubber-like elastic portion has a holding portion for holding the wear-resistant portion, The wear-resistant portion is corrugated.

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