Sealing device

Abstract

A sealing device (100) is disposed in a gap (320) between an outer peripheral surface (201) of a rotating shaft (200) and an inner peripheral surface (310) of a shaft hole (301) in a housing (300) having the shaft hole (301) into which the rotating shaft (200) is inserted, and seals the gap (320), the sealing device (100) being provided with: a sealing body (10) in which the rotating shaft (200) is inserted; the sealing member (10) is configured to be provided with a core bar (30) made of a metal material and a sealing main body component member (20) made of an elastic body and integrated with the core bar (30), and the sealing main body component member (20) comprises a lip part (23). And a conductive lip (50) attached to the seal body (10) and a conductive guard ring (40), the guard ring (40) having a contact portion (41) that contacts the housing (300) and an inwardly extending portion (42) that extends radially inward from the contact portion (41), and the conductive lip (50) being integrated with the seal body (10) by being sandwiched between the inwardly extending portion (42) and the seal body (10).

Description

Technical Field

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

[0002] There is known a sealing device that is arranged in a gap between an outer peripheral surface of a rotating shaft and an inner peripheral surface of a shaft hole in a housing having a shaft hole through which the rotating shaft is inserted.

[0003] like Figure 10 As shown, as an example, the sealing device (sealing device 1000 ) can be assembled and used in a speed reducer 1900 of an electric vehicle (EV) or a fuel cell vehicle (FCV).

[0004] exist Figure 10 In the example, the reducer 1900 includes: a housing 1300; a first rotating shaft 1201, a second rotating shaft 1202 and a third rotating shaft 1203 provided in the housing 1300; and a plurality of bearings 1400 provided in the housing 1300 for axially supporting the first rotating shaft 1201, the second rotating shaft 1202 and the third rotating shaft 1203 respectively.

[0005] The electric power of the battery 1500 is supplied to the motor 1700 via the inverter 1600 . As the motor 1700 is driven, the first rotating shaft 1201 , which is the output shaft of the motor 1700 , rotates.

[0006] The first rotating shaft 1201, the second rotating shaft 1202, and the third rotating shaft 1203 are sequentially connected via a gear 1220. The rotation of the first rotating shaft 1201 is transmitted from the first rotating shaft 1201 to the second rotating shaft 1202, and further from the second rotating shaft 1202 to the third rotating shaft 1203. In other words, the rotation of the first rotating shaft 1201 is transmitted to the third rotating shaft 1203 at a desired reduction ratio.

[0007] A wheel 1800 is provided at the third rotation axis 1203 .

[0008] However, in Figure 10 In a mechanism having rotating shafts (a first rotating shaft 1201, a second rotating shaft 1202, and a third rotating shaft 1203) driven by a motor 1700, as in the example, electromagnetic wave noise transmitted by AM is generated from the rotating shafts due to the induced current generated at the motor 1700, or electric corrosion of the bearing 1400 occurs due to sparks generated at the bearing 1400.

[0009] In order to solve these problems, it is necessary to ensure electrical conduction between the rotating shaft and the housing 1300 , that is, it is necessary to ground the rotating shaft relative to the housing 1300 .

[0010] As a prior art for this, although there is a ground brush, there are problems of requiring to secure a dedicated space or generating brush wear powder and the like.

[0011] As a technology for solving the above problem, there is a sealing device provided with a conductive lip.

[0012] The sealing device of the invention patent document 1 (the sealing ring of the document) is provided with a sealing main body having a lip portion (the sealing lip of the document), and a conductive lip (the front seal of the document) provided to a face of the sealing main body on the atmosphere side.

[0013] Prior art document

[0014] Invention patent document

[0015] Invention patent document 1: Japanese Patent Application Publication No. 2014-142065 Summary of the invention

[0016] Problem to be solved by the invention

[0017] However, according to the research by the present inventors and the like, in the technology of the invention patent document 1, there is room for improvement regarding the integrity of the conductive lip and the sealing main body.

[0018] The present invention has been achieved in view of the above problem, and provides a sealing device capable of realizing a good integrity structure of a conductive lip and a sealing main body.

[0019] Means for solving the problem

[0020] According to the present invention, there is provided a sealing device configured to seal a gap between an outer peripheral surface of a rotating shaft and an inner peripheral surface of a shaft hole of a housing having the shaft hole into which the rotating shaft is inserted, the sealing device being provided with:

[0021] a sealing main body configured to have a core made of a metal material and a sealing main body constituent member made of an elastic body and integrated with the core, the sealing main body constituent member including a lip portion; and

[0022] a conductive lip and a conductive protective ring installed to the sealing main body,

[0023] the protective ring having an abutting portion abutting against the housing and an inwardly extending portion extending from the abutting portion toward a radially inner side,

[0024] the conductive lip being integrated with the sealing main body by being sandwiched by the inwardly extending portion and the sealing main body.

[0025] Effects of the invention

[0026] According to the present application, good integration of the conductive lip and the sealing body can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a view showing a sealing device according to the first embodiment, showing a cut end surface along the axis of the rotation axis.

[0028] Figure 2 is a partial enlarged view of Figure 1

[0029] Figure 3 is a view showing a sealing device according to the first embodiment, showing a cut end surface along the axis of the rotation axis.

[0030] Figure 4 is a view showing a sealing device according to the first embodiment, showing a cut end surface along the axis of the rotation axis.

[0031] Figure 5 is a view showing a sealing device according to the first embodiment, showing a cut end surface along the axis of the rotation axis.

[0032] Figure 6 is an exploded perspective view of the sealing device according to the first embodiment.

[0033] Figure 7 is a view showing a sealing device according to the first embodiment, showing a cut end surface along the axis of the rotation axis.

[0034] Figure 8 is a view showing a sealing device according to the first embodiment, showing a cut end surface along the axis of the rotation axis.

[0035] Figure 9 is a view showing a sealing device according to the first embodiment, showing a cut end surface along the axis of the rotation axis.

[0036] Figure 10 is a view for explaining a problem of a general sealing device.

[0037] SYMBOL EXPLANATION

[0038] ​10 sealing body, 20 sealing body constituent member, 21 body abutting portion, 21a contact surface, 22 body inward extending portion, 22a recess, 22b back support portion, 23 lip portion, 25 outward extending portion, 30 core, 31 cylindrical portion, 31a contact surface, 32 core inward extending portion, 32a contact surface, 32b bent portion, 40 protection ring, 41 abutting portion, 42 inward extending portion, 42b bent portion, 50 conductive lip, 50a base portion, 50b tip portion, 60 clamping spring, 70 disc spring, 71 body portion, 72 wing portion, 73 slit, 80 clamping spring, 90 oil slinger, 100 sealing device, 200 rotating shaft, 210 outer peripheral surface, 300 housing, 301 shaft hole, 310 inner peripheral surface, 320 gap, 330 inner side, 340 outer side, 421 outer side flange portion, 422 intermediate cylindrical portion, 423 inner side flange portion, 1000 sealing device, 1201 first rotating shaft, 1202 second rotating shaft, 1203 third rotating shaft, 1220 gear, 1300 housing, 1400 bearing, 1500 battery, 1600 inverter, 1700 motor, 1800 wheel, 1900 speed reducer. DETAILED DESCRIPTION

[0039] Hereinafter, an embodiment of the present application will be described using the drawings. Note that the same reference signs are assigned to the same constituent elements throughout the drawings, and the description will be appropriately omitted.

[0040] [First Embodiment]

[0041] First, the sealing body 10 will be described using FIG. 1. Figure 1 and Figure 2 The first embodiment will be described.

[0042] The sealing device 100 according to the present embodiment is arranged in a gap 320 between an outer peripheral surface 210 of a rotating shaft 200 and an inner peripheral surface 310 of a shaft hole 301 of a housing 300, and seals the gap 320. The housing 300 has the shaft hole 301 into which the rotating shaft 200 is inserted.

[0043] The sealing device 100 includes a sealing body 10, and a conductive lip 50 and a conductive protection ring 40 attached to the sealing body 10.

[0044] The sealing body 10 is configured to include a core 30 made of a metal material, and a sealing body constituent member 20 made of an elastic body and integrated with the core 30. The sealing body constituent member 20 includes a lip portion 23.

[0045] The protection ring 40 has an abutting portion 41 that abuts against the housing 300, and an inward extending portion 42 that extends from the abutting portion 41 to the radially inner side.

[0046] The conductive lip 50 is integrated with the seal body 10 by being sandwiched by the inwardly extending portion 42 and the seal body 10.

[0047] Here, the seal device 100 is arranged in the gap 320 in such a manner that the central axis AX of the seal device 100 coincides with the axis of the rotating shaft 200.

[0048] In the following description, a direction orthogonal to the central axis AX will be referred to as the radial direction.

[0049] Further, in the radial direction, a direction away from the central axis AX will be referred to as the radially outer side, and a direction close to the central axis AX will be referred to as the radially inner side.

[0050] Further, a direction around the circumference of the central axis AX will be referred to as the circumferential direction.

[0051] Further, there are cases where a direction along the central axis AX will simply be referred to as the axial direction.

[0052] Further, in the direction along the central axis AX, one side (the right side in Figure 1 and Figure 2 ) is the inner side (the machine inner side) of the mechanism in which the seal device 100 is arranged, and this direction will be referred to as the inner side 330. Further, in the direction along the central axis AX, the other side (the left side in Figure 1 and Figure 2 ) is the outer side (the atmospheric side) of the mechanism in which the seal device 100 is arranged, and this direction will be referred to as the outer side 340.

[0053] According to the seal device 100 according to the present embodiment, when the seal device 100 is assembled to the housing 300, and the gap 320 of the shaft hole 301 of the housing 300 is sealed, a conductive path between the housing 300 and the rotating shaft 200 is formed by the protective ring 40 and the conductive lip 50, part by part. Thus, by the protective ring 40 and the conductive lip 50, conduction between the rotating shaft 200 and the housing 300 can be ensured, i.e., the rotating shaft can be grounded with respect to the housing 300. Therefore, it is possible to suppress electromagnetic wave noise of AM transmission generated from the rotating shaft or to suppress electric erosion of the bearing.

[0054] Further, according to the seal device 100 according to the present embodiment, since the conductive lip 50 is integrated with the seal body 10 by being sandwiched by the inwardly extending portion 42 and the seal body 10, good integration of the conductive lip 50 and the seal body 10 can be achieved.

[0055] Since the seal device 100 can replace the existing seal device, a space dedicated to the grounding brush is not necessary, and abrasion powder of the brush can not be generated.

[0056] Further, unlike the technology of ensuring electrical conduction from the rotating shaft 200 to the housing 300 with an electrically conductive lip monomer, since the ensuring is performed by the electrically conductive lip 50 and the protector ring 40 that is a metal member, it is also possible to reduce the electrical resistance of the electrically conductive path from the rotating shaft 200 to the housing 300.

[0057] In the present application, the lip 23 can be an oil lip or a dust lip.

[0058] In the case of the present embodiment, the lip 23 is an oil lip. That is, the sealing body 10 constitutes an oil seal body.

[0059] Since the sealing device 100 has both the sealing body 10 having the lip 23 as an oil lip and the electrically conductive lip 50, it is possible to take into account both the oil seal performance and the electrical conductivity while reducing the number of components and the installation space.

[0060] By disposing the electrically conductive lip 50 on the outside 340 (atmosphere side) of the contact position of the lip 23 as an oil lip with the rotating shaft 200, it is possible to impart electrical conductivity without impairing the oil seal performance.

[0061] The sealing device 100 suppresses the intrusion of foreign matter from the outside 340 to the inside 330 by the lip 23 and the electrically conductive lip 50, and suppresses the leakage of lubricant from the inside 330 to the outside 340 by the lip 23.

[0062] Hereinafter, the present embodiment will be described in more detail.

[0063] As one example, the mechanism in which the sealing device 100 is disposed (installed) is a reduction mechanism of an electric vehicle (EV) or a fuel cell vehicle (FCV) and has a housing 300 composed of a metal material. The housing 300 has a shaft hole 301 into which the rotating shaft 200 is inserted.

[0064] Note that, generally, in the sealing device 100 and the rotating shaft 200, the sealing device 100 is inserted into the shaft hole 301 and fixed first, and then the rotating shaft 200 is inserted.

[0065] The sealing body constituting member 20 is formed in a circular ring shape around the center axis AX.

[0066] The sealing body constituting member 20 has, for example, a body abutment portion 21 formed in a cylindrical shape concentric with the center axis AX, a body inwardly extending portion 22 extending in an inner flange shape toward the radial inside from one end portion (end portion on the outside 340) of the body abutment portion 21 in the axial direction, and a lip 23 extending from the end portion on the radial inside of the body inwardly extending portion 22 in the axial direction (toward the inside 330). As for the lip 23, it also becomes a shape that can be said to be a cylindrical shape concentric with the center axis AX.

[0067] The lip portion 23 is distanced from the main body abutting portion 21 and is disposed inside the main body abutting portion 21. The main body abutting portion 21 and the lip portion 23 face each other in the radial direction.

[0068] The seal main body constituent member 20 is formed in a three-dimensional shape that corresponds to the movement locus of the cut end face shape of the seal main body constituent member 20 shown in FIG. 6 when the cut end face shape is rotated one revolution around the center axis AX. Figure 2

[0069] A portion of the outer peripheral surface of the main body abutting portion 21 becomes a contact surface 21a that is crimped in a ring shape to the inner peripheral surface 310 of the shaft hole 301.

[0070] The lip portion 23 is crimped in a ring shape to the outer peripheral surface 210 of the rotating shaft 200 and slides with respect to the outer peripheral surface 210 when the rotating shaft 200 rotates.

[0071] The crimping portions of the contact surface 21a and the inner peripheral surface 310 and the crimping portions of the lip portion 23 and the outer peripheral surface 210 can ensure sealing.

[0072] Hereinafter, the crimping portions of the contact surface 21a and the inner peripheral surface 310 and the crimping portions of the lip portion 23 and the outer peripheral surface 210 will be collectively referred to as sealing portions.

[0073] In the case of the present embodiment, the lip portion 23 is an oil lip, and in a region inside the sealing portions, a lubricant such as lubricating oil is filled.

[0074] Since the lip portion 23 is not required to be conductive, a general sealing rubber material can be used as the material of the seal main body constituent member 20.

[0075] As such an elastic material, for example, synthetic rubbers such as nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), and fluororubber (FKM) can be cited.

[0076] The seal main body constituent member 20 is integrally molded as a whole.

[0077] More specifically, the seal main body constituent member 20 is integrally molded together with the core 30.

[0078] For example, the core 30 (and, as needed, the clamping spring 60 described later) is disposed in an unillustrated molding die, and an uncrosslinked rubber material is injected, and then the rubber material is crosslinked by heating and pressurizing the cavity of the molding die, whereby the seal main body 10 in which the seal main body constituent member 20 and the core 30 are integrally molded can be obtained.

[0079] As the metal material that constitutes the core 30, for example, stainless steel (SUS) or cold-rolled steel (SPCC) can be cited.​

[0080] The core 30 can be formed by press working, forging.

[0081] The core 30 has, for example, a cylindrical portion 31 formed in a cylindrical shape concentric with the central axis AX, and a core inward extending portion 32 extending in an inward flange shape toward the radially inner side from one end portion (an end portion of the outer side 340) of the cylindrical portion 31 in the axial direction.

[0082] In the case of the present embodiment, the core inward extending portion 32 is formed in a flat plate shape orthogonal to the central axis AX, and is formed in a donut shape.

[0083] The core 30 is formed in a three-dimensional shape corresponding to the movement locus of the cut end surface shape of the core 30 shown in FIG. 6 when the cut end surface shape is rotated one revolution around the central axis AX. Figure 2

[0084] In the case of the present embodiment, the core 30 is entirely buried in the seal main body constituting member 20 and does not protrude from the seal main body constituting member 20.

[0085] The cylindrical portion 31 is disposed, for example, from the inside of the main body abutting portion 21 to the inside of the boundary portion of the main body abutting portion 21 and the main body inward extending portion 22. The core inward extending portion 32 is disposed from the inside of the boundary portion of the main body abutting portion 21 and the main body inward extending portion 22 to the inside of the main body inward extending portion 22. For example, the inner periphery of the core inward extending portion 32 is located in the vicinity of the boundary portion of the main body inward extending portion 22 and the lip portion 23.

[0086] As described above, the protection ring 40 has an abutting portion 41 and an inward extending portion 42.

[0087] The abutting portion 41 is formed, for example, in a cylindrical shape concentric with the central axis AX.

[0088] The inward extending portion 42 extends in an inward flange shape toward the radially inner side from one end portion (an end portion of the outer side 340) of the abutting portion 41 in the axial direction.

[0089] In the case of the present embodiment, the inward extending portion 42 is formed in a flat plate shape orthogonal to the central axis AX, and is formed in a donut shape.

[0090] The protection ring 40 is formed in a three-dimensional shape corresponding to the movement locus of the cut end surface shape of the protection ring 40 shown in FIG. 10 when the cut end surface shape is rotated one revolution around the central axis AX. Figure 2

[0091] The outer peripheral surface of the abutting portion 41 is crimped to the inner peripheral surface 310 of the shaft hole 301 in a ring shape. ​​

[0092] The material of the protection ring 40 is preferably a metal material, and examples thereof include stainless steel (SUS) and cold-rolled steel (SPCC).

[0093] The protection ring 40 can be formed by press working or forging.

[0094] The conductive lip 50 is formed in a donut shape centered on the central axis AX.

[0095] A portion (a portion on the radially outer side) of the conductive lip 50 is arranged along a surface that faces the outer side 340 in the main body inwardly extending portion 22 of the seal main body constituting member 20.

[0096] In the case of the present embodiment, the portion on the radially inner side in the conductive lip 50 extends more to the radially inner side than the inwardly extending portion 42. The portion on the radially inner side in the conductive lip 50 protrudes toward the radially inner side from the end portion on the radially inner side of the main body inwardly extending portion 22.

[0097] In the conductive lip 50, the portion that extends more to the radially inner side than the inwardly extending portion 42 is bent toward the outer side 340 (the left side in FIG. 6). Figure 2

[0098] The conductive lip 50 is formed in a three-dimensional shape that corresponds to the movement locus of the cross-sectional end surface shape of the conductive lip 50 shown in FIG. 7 when the cross-sectional end surface shape is rotated one revolution around the central axis AX. Figure 2

[0099] In the case of the present embodiment, the front end portion (the end portion on the radially inner side) of the conductive lip 50 is in a surrounding contact with the outer peripheral surface 210 of the rotary shaft 200, and the electrical conduction between the rotary shaft 200 and the conductive lip 50 can be ensured.

[0100] Note that the front end portion of the conductive lip 50 slides with respect to the outer peripheral surface 210 when the rotary shaft 200 rotates.

[0101] In the case of the present embodiment, the conductive lip 50 is not required to be sealed. Therefore, as the material of the conductive lip 50, a material dedicated to electrical conduction can be used, and as such a material, examples include conductive rubber, conductive resin, and the like. The material of the conductive lip 50 is conductive PTFE (fluororesin: polytetrafluoroethylene), which is a preferable example.

[0102] The clamping spring 60 is constituted by a spiral spring whose both ends are connected to each other and whose axis of rotation is circularly looped. The axis of rotation of the spiral spring is looped around the circumference of the central axis AX. That is, the clamping spring 60 is formed in a circular ring shape in the circumferential direction.

[0103] ​​The clamping spring 60 is a tensile type coil spring that exerts a force in a direction that shortens its axial length. Since the clamping spring 60 is a circular ring shape, the clamping spring 60 exerts a force in a direction that shortens the radius of the ring.

[0104] The clamping spring 60 is disposed in a groove formed in a circumferential surface (a surface facing the cylindrical portion 31) of the lip portion 23 in a surrounding manner, and exerts a force on the lip portion 23 toward the radially inner side. Thus, the clamping spring 60 functions to bind the lip portion 23 to the rotating shaft 200.

[0105] Thus, the inner periphery of the lip portion 23 is pressed against the outer circumferential surface 210 of the rotating shaft 200 in a good manner.

[0106] Note that, in the lip portion 23, the portion that is pressed against the outer circumferential surface 210 is a portion that is distal from the boundary portion between the body inward extending portion 22 and the lip portion 23 (the distal inner side 330). The portion of the lip portion 23 that is more proximal to the body inward extending portion 22 than the portion that is pressed against the outer circumferential surface 210, and the boundary portion between the lip portion 23 and the body inward extending portion 22, are not in contact with the outer circumferential surface 210, and a gap is generated between these portions and the outer circumferential surface 210.

[0107] In the case of the present embodiment, the sealing body constituent member 20 holds the conductive lip 50 together with the inward extending portion 42 of the protection ring 40.

[0108] More specifically, of the core 30 and the sealing body constituent member 20, only the sealing body constituent member 20 holds the conductive lip 50 (the portion of the conductive lip 50 that is radially outside) together with the inward extending portion 42, and the core 30 does not hold the conductive lip 50.

[0109] The inward extending portion 42 is disposed along the face of the outer side 340 (left side in FIG. 1) of the body inward extending portion 22, and the conductive lip 50 is held by the body inward extending portion 22 and the inward extending portion 42. Figure 2

[0110] In the case of the present embodiment, the sealing body constituent member 20 has a recessed portion 22a for disposing a portion of the conductive lip 50 (the portion of the conductive lip 50 that is radially outside). Thus, it is possible to position and fix the conductive lip 50 more stably with respect to the sealing body constituent member 20, and further with respect to the sealing body 10, at the time of assembly of the sealing device 100 and after assembly. That is, the sealing device 100 has excellent ease of manufacture and structural stability.

[0111] The recessed portion 22a is formed in the outer side 340 (left side in FIG. 1) of the body inward extending portion 22. Figure 2 ​The concave portion 22a is formed on the surface of the contact surface 21a (the left side in FIG. 1) of the seal main body 10. The depth (dimension in the direction of the central axis AX) of the concave portion 22a is smaller than the thickness dimension of the conductive lip 50 before assembly of the seal main body 10, and the conductive lip 50 is held in a compressed state between the inwardly extending portion 42 and the bottom surface of the concave portion 22a.

[0112] The outer periphery of the conductive lip 50 is positioned by the outer periphery of the concave portion 22a.

[0113] In this way, the conductive lip 50 is fitted with respect to the seal main body constituent member 20.

[0114] Here, the distance from the inner periphery to the outer periphery of the conductive lip 50 in the radial direction, that is, {(outer diameter of the conductive lip 50) - (inner diameter of the conductive lip 50)} / 2, is smaller than the distance from the outer peripheral surface 210 of the rotary shaft 200 to the inner peripheral surface 310 of the housing 300, that is, {(inner diameter of the shaft hole 301) - (outer diameter of the rotary shaft 200)} / 2. Also, the outer periphery of the conductive lip 50 is located more radially inward than the contact surface 21a of the seal main body constituent member 20. More specifically, the outer periphery of the conductive lip 50 is located more radially inward than the inner peripheral surface of the abutment portion 41 of the protective ring 40. Therefore, it is possible to easily achieve a structure in which the conductive lip 50 is fitted in the concave portion 22a.

[0115] Since the conductive lip 50 is formed to such dimensions (unlike the conductive lip of Patent Document 1 (the front seal of this document)), the outer periphery of the conductive lip 50 does not reach (is distanced from) the inner peripheral surface 310.

[0116] In the case of the present embodiment, the protective ring 40 is fixed to the seal main body constituent member 20.

[0117] More specifically, the abutment portion 41 of the protective ring 40 is rivet-fixed to the outer peripheral surface of the end portion of the outer side 340 of the seal main body constituent member 20.

[0118] In the axial direction, the range in which the abutment portion 41 is arranged approximately overlaps the range in which the main body inward extending portion 22 of the seal main body constituent member 20 is arranged, and the abutment portion 41 is rivet-fixed to the outer peripheral surface of the boundary portion of the main body abutment portion 21 and the main body inward extending portion 22.

[0119] The seal device 100 is constituted as described above.

[0120] The assembly work of the conductive lip 50 and the protection ring 40 with respect to the seal main body 10 can be performed, for example, by first aligning the conductive lip 50 with respect to the seal main body 10, and then embedding the protection ring 40 in the seal main body 10. That is, by arranging a portion (a radially outer portion) of the conductive lip 50 in the recess 22a of the main body inward extending portion 22, and then fitting the abutting portion 41 of the protection ring 40 outside the seal main body constituent member 20, the conductive lip 50 and the protection ring 40 can be assembled with the seal main body 10.

[0121] Here, in a state before the conductive lip 50 is assembled with the seal main body 10, the conductive lip 50 can be flat plate-shaped as a whole, or can be curved as shown in Figure 2

[0122] In a case where the conductive lip 50 is flat plate-shaped (doughnut-shaped) before assembly of the seal main body 10, the conductive lip 50 is assembled with the seal main body 10, and a portion of the conductive lip 50 on the radially outer side is compressed by being sandwiched by the inward extending portion 42 and the main body inward extending portion 22, whereby the conductive lip 50 is deformed. Thus, in the conductive lip 50, a portion extending more radially inward than the inward extending portion 42 is curved toward the inward extending portion 42 (left side in Figure 2

[0123] The seal device 100 is fixed to the housing 300. That is, the contact surface 21a and the abutting portion 41 are crimped and fixed to the inner peripheral surface 310, and the seal device 100 is inserted into the shaft hole 301, whereby the seal device 100 is fixed to the housing 300.

[0124] Here, in a state before the rotary shaft 200 is inserted into the seal device 100, it is preferable that the inner diameter of the conductive lip 50 be smaller than the inner diameter of the lip portion 23.

[0125] By thus setting, in a state after the rotary shaft 200 is inserted into the seal device 100, a structure in which the contact area of the rotary shaft 200 with the conductive lip 50 is larger than the contact area of the rotary shaft 200 with the lip portion 23 can be achieved. That is, a structure in which the distance L2 is larger than the distance L1 as shown in Figure 3

[0126] ​​​It should be noted that the lip 23 has higher rigidity than the conductive lip 50 , and even if the contact area between the rotating shaft 200 and the lip 23 is smaller than the contact area between the rotating shaft 200 and the conductive lip 50 , the sealing performance by the lip 23 can be sufficiently ensured.

[0127] <Modification 1 of the First Embodiment>

[0128] Next, use Figure 3 Modification 1 of the first embodiment will be described.

[0129] The sealing device 100 according to this modification example differs from the sealing device 100 according to the first embodiment in the points described below, and has the same configuration as the sealing device 100 according to the first embodiment in other points.

[0130] In the case of this modified example, the radially inner end portion (edge) of the inwardly extending portion 42 of the guard ring 40 forms a bent portion 42 b that is bent toward the conductive lip 50 .

[0131] Thus, the bent portion 42b presses the conductive lip 50, thereby maintaining the tip of the conductive lip 50 in constant contact with the outer peripheral surface 210 of the rotating shaft 200. This prevents a decrease in the adhesion of the conductive lip 50 to the rotating shaft 200 due to aging of the conductive lip 50, and maintains electrical conduction between the rotating shaft 200 and the housing 300.

[0132] More specifically, the bent portion 42b is directed toward one side (inner side 330: Figure 3 That is, the bent portion 42b is bent in the direction opposite to the direction of the bending of the conductive lip 50 ( Figure 4 The conductive lip 50 is bent in the opposite direction to the left side in the figure, and the conductive lip 50 is pressed in this direction.

[0133] Thus, the bent portion 42 b can press the conductive lip 50 against the rotating shaft 200 , and even if the conductive lip 50 deteriorates over time, deformation of the conductive lip 50 in a direction away from the rotating shaft 200 (radially outward) can be restricted.

[0134] <Modification 2 of the First Embodiment>

[0135] Next, use Figure 4 Modification 2 of the first embodiment will be described.

[0136] The sealing device 100 according to this modification example differs from the sealing device 100 according to the first embodiment in the points described below, and has the same configuration as the sealing device 100 according to the first embodiment in other points.

[0137] In the case of the present modification example, the core bone 30 holds the conductive lip 50 together with the inwardly extending portion 42 of the protection ring 40.

[0138] Since the core bone 30 is a metal member having higher rigidity than the sealing body constituent member 20, the conductive lip 50 can be held more stably by the inwardly extending portion 42 and the sealing body 10.

[0139] More specifically, in the radially outer portion of the conductive lip 50, particularly the radially outer portion is held by the inwardly extending portion 42 and the core bone 30, and in the radially inner portion of the conductive lip 50, particularly the radially inner portion is held by the inwardly extending portion 42 and the sealing body constituent member 20.

[0140] However, the present application is not limited to this example, and the portion of the sealing body 10 that holds the radially outer portion of the conductive lip 50 together with the inwardly extending portion 42 can be only the core bone 30.

[0141] The core bone inwardly extending portion 32 is formed, for example, in a flat plate shape orthogonal to the center axis AX except for a radially inner end portion (end edge) (a bent portion 32b described below), and the radially inner end portion is bent in a crank shape toward the inner portion 330( Figure 4 on the right side in FIG. 6). In the core bone inwardly extending portion 32, the portion formed in a flat plate shape orthogonal to the center axis AX and the boundary portion of the core bone inwardly extending portion 32 and the cylindrical portion 31 are exposed to the outer surface of the sealing body 10 (the surface of the outer portion 340).

[0142] Also, in the core bone inwardly extending portion 32 of the core bone 30, a portion of the surface toward the outer portion 340( Figure 5 on the left side in FIG. 6) becomes a contact surface 32a that makes surface contact with the conductive lip 50.

[0143] In the case of the present modification example, the protection ring 40 is fixed to the core bone 30. That is, since the protection ring 40 is fixed to the core bone 30 that is a metal member, the holding property of the protection ring 40 with respect to the sealing body 10 can be improved.

[0144] More specifically, a portion of the outer peripheral surface of the cylindrical portion 31 of the core bone 30 up to the boundary portion of the cylindrical portion 31 and the core bone inwardly extending portion 32 is exposed to the outer peripheral surface of the sealing body 10, and the exposed portion has a contact surface 31a that makes surface contact with the inner peripheral surface of the abutting portion 41 of the protection ring 40.

[0145] The abutment portion 41 is directly riveted and fixed to the contact surface 31a. More specifically, in a portion of the outer peripheral surface of the seal main body 10 including the end portion of the outer side 340, the contact surface 31a is exposed.

[0146] The portion of the tubular portion 31 on the side of the core bone inward extension portion 32 (i.e., the outer side 340), and the boundary portion of the tubular portion 31 and the core bone inward extension portion 32 are more bulged (thicker) toward the radial outer side than the portion of the tubular portion 31 on the inner side 330. The bulged portion has the contact surface 31a.

[0147] Here, in the present modification example, the conductive path from the rotating shaft 200 to the housing 300 includes, in addition to the path via the conductive lip 50 and the protection ring 40, a path via the conductive lip 50, the core bone 30, and the protection ring 40. Thereby, it is possible to reduce the electrical resistance of the conductive path from the rotating shaft 200 to the housing 300.

[0148] Note that, in the case of the present modification example, the seal main body constituting member 20 does not have the recessed portion 22a.

[0149] <Modification Example 3 of the First Embodiment>

[0150] Next, the use of the seal device 100 according to the modification example 3 will be described. Figure 6 and Figure 6 The seal device 100 according to the modification example 3 will be described.

[0151] The seal device 100 according to the present modification example is different from the seal device 100 according to the above-described first embodiment in the following points, and is similarly constituted to the seal device 100 according to the above-described first embodiment in other points.

[0152] In the case of the present modification example, the seal device 100 further has a disc spring 70 sandwiched between the inward extension portion 42 of the protection ring 40 and the conductive lip 50, and the disc spring 70 presses the portion of the conductive lip 50 extending more toward the radial inner side than the inward extension portion 42 toward the side opposite to the inward extension portion 42 side (i.e., the inner side 330).

[0153] Thereby, it is possible to maintain the state where the front end of the conductive lip 50 is in contact with the outer peripheral surface 210 of the rotating shaft 200. Therefore, it is possible to suppress the decrease in the tightness of the conductive lip 50 with respect to the rotating shaft 200 due to the aging of the conductive lip 50 over the years, and it is possible to maintain the electrical conduction between the rotating shaft 200 and the housing 300.

[0154] While the shape of disc spring 70 is not particularly limited, as an example, disc spring 70 includes: a flat, donut-shaped main body 71 perpendicular to central axis AX; and a plurality of wings 72 projecting radially inward from the inner circumferential edge of main body 71. Wings 72 are arranged (e.g., at equal intervals) along the circumference of main body 71. A plurality of radially extending slits 73 are formed in wings 72. Wings 72 are bent toward outer side 340 relative to main body 71.

[0155] However, the disc spring 70 may include an inner peripheral portion (not shown) formed in a shape corresponding to the outer peripheral surface of a truncated cone (a truncated cone) centered on the central axis AX, instead of the plurality of wing portions 72 .

[0156] The disc spring 70 is preferably made of a metal material.

[0157] Here, in this modification, the conductive lip 50 is shown in a state before being compressed by being sandwiched between the inward extending portion 42, the disc spring 70, and the main body inward extending portion 22. Figure 5 As shown, the conductive lip 50 is flat in shape, and the conductive lip 50 is compressed by being clamped by the inward extension portion 42, the disc spring 70, and the main body inward extension portion 22. Figure 5 As shown, the conductive lip 50 is bent. However, the present invention is not limited to this example, and the conductive lip 50 may be bent before being compressed by the inward extension 42, the disc spring 70, and the main body inward extension 22. Figure 7 flexed as shown.

[0158] <Variation 4 of the First Embodiment>

[0159] Next, use Figure 8 Modification 4 of the first embodiment will be described.

[0160] The sealing device 100 according to this modification example differs from the sealing device 100 according to the first embodiment in the points described below, and has the same configuration as the sealing device 100 according to the first embodiment in other points.

[0161] In this modified example, the portion of the conductive lip 50 that extends radially inward from the inwardly extending portion 42 includes a base portion 50a extending radially inward from the inwardly extending portion 42, and a tip portion 50b bent radially outward from the radially inner end of the base portion 50a. The sealing device 100 further includes a clamp spring 80 disposed at the boundary between the base portion 50a and the tip portion 50b, which constrains the portion of the conductive lip 50 that extends radially inward from the inwardly extending portion 42 relative to the rotating shaft 200.

[0162] The clamping spring 80 is identical to the clamping spring 60 and is formed in a ring shape in a circumferential direction.

[0163] The clamping spring 80 is disposed in a surrounding manner on a surface facing the radially outer side in the boundary portion between the base portion 50a and the front end portion 50b of the conductive lip 50. Thus, the clamping spring 80 presses the conductive lip 50 toward the radially inner side.

[0164] Therefore, according to the present modification example, the adhesion of the conductive lip 50 to the rotating shaft 200 can be improved.

[0165] Note that, in the present modification example, the portion of the conductive lip 50 that contacts and slides in a surrounding manner with respect to the outer circumferential surface 210 of the rotating shaft 200 is the portion facing the radially inner side in the boundary portion between the base portion 50a and the front end portion 50b.

[0166] It is preferable that the portion of the conductive lip 50 that extends more toward the radially inner side than the inwardly extending portion 42 be formed to have a wall thickness that is thicker than the portion of the conductive lip 50 that is radially outside. By being configured in this way, excessive deformation of the conductive lip 50 due to the force of the clamping spring can be suppressed.

[0167] <Modification Example 5 of the First Embodiment>

[0168] Next, the use of the sealing device 100 according to the present modification example will be described. Figure 8 The sealing device 100 according to the present modification example is different from the sealing device 100 according to the above-described first embodiment in the following points and is configured in the same manner as the sealing device 100 according to the above-described first embodiment in other points.

[0169] The sealing device 100 according to the present modification example is different from the sealing device 100 according to the above-described first embodiment in the following points and is configured in the same manner as the sealing device 100 according to the above-described first embodiment in other points.

[0170] In the present modification example, the portion of the sealing main body 10 along which the conductive lip 50 is disposed has a back support portion 22b that locally protrudes toward the radially inner side.

[0171] Thus, when the mechanism including the sealing device 100 is assembled, even when the portion of the conductive lip 50 that extends more toward the radially inner side than the inwardly extending portion 42 is pressed toward the inner side 330 due to friction with the rotating shaft 200, since the conductive lip 50 is supported by the back support portion 22b, the conductive lip 50 can be suppressed from being bent and rolled toward the inner side 330. Figure 9

[0172] More specifically, in the sealing main body 10, the portion along which the conductive lip 50 is disposed (as well as the back support portion 22b) is a portion of the sealing main body constituent member 20.

[0173] ​[Second Embodiment]

[0174] Next, using Figure 9 The second embodiment will be described.

[0175] The sealing device 100 according to the present embodiment is different from the sealing device 100 according to the above-described first embodiment in the following points, and is configured similarly to the sealing device 100 according to the above-described first embodiment in other points.

[0176] In the case of the present embodiment, the lip portion 23 of the sealing main body 10 is a dust lip.

[0177] Since the sealing device 100 has both the sealing main body 10 having the lip portion 23 as a dust lip and the conductive lip 50, it is possible to take into account both dust sealing performance and conductivity while reducing the number of components and the installation space.

[0178] By disposing the conductive lip 50 at a position further inside 330 than the contact position of the lip portion 23 as a dust lip with the rotating shaft 200, it is possible to impart conductivity without impairing dust sealing performance.

[0179] In particular, even in a water-covered environment where a ground brush is difficult to apply, it is possible to ensure conduction with a small number of components.

[0180] The sealing device 100 suppresses the intrusion of foreign matter from the outside 340 to the inside 330 by the lip portion 23 and the conductive lip 50.

[0181] Note that, in the case of the present embodiment, it is also possible to dispose another oil seal (having an oil lip) at a position further inside 330 than the conductive lip 50.

[0182] In the first embodiment, it is described that the portion to be disposed along the inner peripheral surface 310 in the sealing main body constituent member 20 includes the main body abutment portion 21 and the boundary portion of the main body abutment portion 21 and the main body inwardly extending portion 22.

[0183] In contrast, in the present embodiment, the entire portion to be disposed along the inner peripheral surface 310 in the sealing main body constituent member 20 is set as the main body abutment portion 21.

[0184] Therefore, in the case of the present embodiment, the main body abutment portion 21 of the sealing main body constituent member 20 is also referred to as a cylindrical shape in common with the first embodiment.

[0185] Further, a portion of the main body abutment portion 21 (a portion of the inside 330) extends in a gable shape from the end portion of the radially outer side of the main body inwardly extending portion 22 toward the inside 330 (the right side in FIG. 8). Figure 9

[0186] ​In the case of the present embodiment, the lip portion 23 extends obliquely from the end portion of the main body inward extending portion 22 on the radially inner side toward the radially inner side and toward the direction of the outer side 340 (left side in Figure 9

[0187] The seal main body constituting member 20 further has an outward extending portion 25 extending from the face of the outer side 340 of the main body inward extending portion 22 toward the outer side 340. The outward extending portion 25 is disposed at a more radially outer side than the lip portion 23.

[0188] Here, in the case of the present embodiment, a slinger 90 is fixed to the rotation shaft 200. The slinger 90 rotates in conjunction with the rotation of the rotation shaft 200. The slinger 90 is formed, for example, in a stepped flange shape that steps to the inner side 330 toward the radially outer side.

[0189] The outward extending portion 25 extends toward the inside of the gap between the slinger 90 and the outer peripheral face 210 of the rotation shaft 200.

[0190] A recessed portion 22a is formed in the face of the main body inward extending portion 22 toward the inner side 330.

[0191] The electrically conductive lip 50 is disposed in the recessed portion 22a as in the first embodiment, and is assembled to the seal main body constituting member 20. However, the direction in which the electrically conductive lip 50 is bent is the inner side 330 (right side in ​

[0192] The cylindrical portion 31 of the core bone 30 is embedded in the main body abutting portion 21. However, a part of the cylindrical portion 31 can also be exposed from the main body abutting portion 21 (seal main body constituting member 20).

[0193] The core bone inward extending portion 32 is embedded from the inside of the boundary portion of the main body abutting portion 21 and the main body inward extending portion 22 to the inside of the main body inward extending portion 22. The core bone inward extending portion 32 can be formed in a flat plate-shaped flange shape, but can also be partially bent along the shape of the seal main body constituting member 20.

[0194] The abutting portion 41 of the protection ring 40 is formed in a cylindrical shape with an extremely short dimension in the axial direction, and is rivet-fixed to the front end portion (front end portion of the inner side 330) of the portion that extends in a roof shape as described above in the main body abutting portion 21.

[0195] The inward extending portion 42 of the protection ring 40 has an outer flange portion 421, an intermediate cylindrical portion 422, and an inner flange portion 423.

[0196] ​​The outer side flange portion 421 extends in an inner flange shape from the end portion of the inner side 330 of the abutment portion 41 toward the radially inner side. The outer side flange portion 421 is arranged along the front end surface (end surface of the inner side 330) of the portion of the main body abutment portion 21 that extends in a gable shape as described above.

[0197] The intermediate cylindrical portion 422 is formed in a cylindrical shape coaxial with the central axis AX. The intermediate cylindrical portion 422 extends from the end portion of the radially inner side of the outer side flange portion 421 toward the outer side 340. The intermediate cylindrical portion 422 is arranged along the inner peripheral surface of the portion of the main body abutment portion 21 that extends in a gable shape as described above.

[0198] The inner side flange portion 423 extends in an inner flange shape from the end portion of the outer side 340 side of the intermediate cylindrical portion 422 toward the radially inner side. The inner side flange portion 423 is arranged along the surface of the main body inwardly extending portion 22 that faces the inner side 330.

[0199] In the case of the present embodiment, the portion of the protection ring 40 that holds the conductive lip 50 together with the main body inwardly extending portion 22 is the inner side flange portion 423.

[0200] While the embodiments and modifications have been described above with reference to the drawings, they are examples of the present application, and various structures other than those described above can also be employed.

[0201] For example, while the example in which the conductive lip 50 is bent has been described above, the conductive lip 50 can not be bent, and can be arranged as a whole on the same plane.

[0202] Further, while the abutment portion 41 of the protection ring 40 has been described above as being riveted and fixed to either the seal main body constituent member 20 or the core 30, the abutment portion 41 can be riveted and fixed to both the seal main body constituent member 20 and the core 30.

[0203] Further, the above-described embodiments and modifications can be combined arbitrarily without departing from the gist of the present application.

[0204] The present embodiment includes the following technical ideas.

[0205] (1) A seal device that is arranged at a gap between an outer peripheral surface of a rotating shaft and an inner peripheral surface of a shaft hole of a housing having the shaft hole, the shaft hole being for insertion of the rotating shaft, the seal device having:

[0206] a seal main body configured to have a core made of a metal material and a seal main body constituent member made of an elastic body and integrated with the core, the seal main body constituent member including a lip portion; and

[0207] A conductive lip and a conductive protection ring are attached to the seal body,

[0208] The protection ring has an abutting portion that abuts against the housing and an inwardly extending portion that extends from the abutting portion toward the radially inner side,

[0209] The conductive lip is integrated with the seal body by being sandwiched by the inwardly extending portion and the seal body.

[0210] (2) The seal device as recited in (1), wherein the seal body constituent member sandwiches the conductive lip together with the inwardly extending portion.

[0211] (3) The seal device as recited in (2), wherein the seal body constituent member has a recess in which a portion of the conductive lip is disposed.

[0212] (4) The seal device as recited in any one of (1) to (3), wherein the core bone sandwiches the conductive lip together with the inwardly extending portion.

[0213] (5) The seal device as recited in any one of (1) to (4), wherein the protection ring is fixed to the seal body constituent member.

[0214] (6) The seal device as recited in any one of (1) to (5), wherein the protection ring is relatively fixed to the core bone.

[0215] (7) The seal device as recited in any one of (1) to (6), wherein an end portion of the inwardly extending portion on the radially inner side is a bent portion that is bent toward the conductive lip side.

[0216] (8) The seal device as recited in any one of (1) to (6), further comprising a disc spring sandwiched between the inwardly extending portion and the conductive lip,

[0217] The disc spring presses a portion of the conductive lip that extends more radially inward than the inwardly extending portion toward the side opposite the inwardly extending portion side.

[0218] (9) The seal device as recited in any one of (1) to (8), wherein a portion of the seal body along which the conductive lip is disposed has a back support portion that locally protrudes toward the radially inner side.

[0219] (10) The seal device as recited in any one of (1) to (9), wherein the lip portion is an oil lip.

[0220] (11) The seal device as recited in any one of (1) to (9), wherein the lip portion is a dust lip.

[0221] This application claims priority to Japanese Application No. 2023-37276 filed on March 10, 2023, the disclosure of which is incorporated herein in its entirety.

Claims

1. A sealing device disposed in a gap between an outer peripheral surface of a rotating shaft and an inner peripheral surface of a shaft hole in a housing having a shaft hole, thereby sealing the gap, wherein the shaft hole is for inserting the rotating shaft, the sealing device comprising: a sealing body including a core made of a metal material and a sealing body component made of an elastomer and integrated with the core, the sealing body component including a lip portion; and A conductive lip and a conductive protective ring, wherein the conductive lip and the conductive protective ring are mounted on the sealing body, The protective ring has an abutting portion abutting against the housing and an inwardly extending portion extending radially inward from the abutting portion. The conductive lip is integrated with the sealing body by being sandwiched between the inwardly extending portion and the sealing body.

2. The sealing device according to claim 1, wherein: The sealing body constituting member sandwiches the conductive lip together with the inwardly extending portion.

3. The sealing device according to claim 2, wherein: The seal body component has a recessed portion in which a portion of the conductive lip is disposed.

4. The sealing device according to claim 1, wherein: The core bar and the inwardly extending portion together clamp the conductive lip.

5. The sealing device according to any one of claims 1 to 4, wherein: The protection ring is fixed to the seal body component.

6. The sealing device according to any one of claims 1 to 5, wherein: The protection ring is fixed to the core bar.

7. The sealing device according to any one of claims 1 to 6, wherein: A radially inner end portion of the inwardly extending portion forms a bent portion bent toward the conductive lip side.

8. The sealing device according to any one of claims 1 to 6, wherein: The sealing device further includes a disc spring interposed between the inwardly extending portion and the conductive lip. The disc spring presses a portion of the conductive lip that extends radially inward of the inward extending portion toward a side opposite to the inward extending portion.

9. The sealing device according to any one of claims 1 to 8, wherein: In the sealing body, a portion arranged along the conductive lip includes a backing portion partially protruding radially inward.

10. The sealing device according to any one of claims 1 to 9, wherein: The lip is an oil lip.

11. The sealing device according to any one of claims 1 to 9, wherein: The lip is a dust lip.

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