Conductive sliding member, seal device, and method for manufacturing seal device

Abstract

The invention is easy to add conductivity. In an annular space (S) between a shaft (20) and a conductive housing (30) that rotate relative to each other, the conductive sliding member (10) is provided with: an annular conductive lip part (11) that is formed from a molded body of a conductive elastic body and is capable of sliding on the surface (21) of the shaft (20); and a sealing device joining section (14) that is provided on the outer peripheral side of the conductive lip section (11) and that can be joined to the sealing device main body section (200) on the side of the sealing device (100) that closes the annular space (S), said side being opposite to the side of the fluid to be sealed.

Description

Technical Field

[0001] The present invention relates to a conductive sliding member, a sealing device, and a method for manufacturing a sealing device. Background Art

[0002] It is known that in vehicles equipped with electric motors such as electric vehicles (EVs) and fuel cell vehicles (FCVs), electromagnetic wave noise to AM (Amplitude Modulation) radios or electrical corrosion of bearings may be generated due to the induced current generated by the motor. As a technology to deal with such a situation, a vehicle power transmission device including a conductive brush electrically connected to the vehicle body via a housing supporting an output shaft is disclosed (for example, see Patent Document 1). In addition, as a technology to deal with such a situation, a seal including a sealing lip made of a conductive polymer material is disclosed (for example, see Patent Document 2).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-207534

[0006] Patent Document 2: Japanese Patent Application Publication No. 2018-189236 Summary of the invention

[0007] Technical problem to be solved by the invention

[0008] However, the generation of the above-mentioned electromagnetic wave noise and electrical corrosion may sometimes become a problem in the later stages of the development of the drive unit of a vehicle equipped with an electric motor. In such a case, in order to solve the problem, the design of the reducer may be changed by adding a conductive brush to the reducer or changing the existing sealing device to a device using a conductive material. Therefore, further improvements are sought in the sealing device in terms of easy addition of conductivity.

[0009] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a conductive sliding member, a sealing device, and a method for manufacturing a sealing device to which conductivity can be easily imparted.

[0010] Solutions for solving technical problems

[0011] In order to achieve the above-mentioned purpose, the conductive sliding component of the present invention is installed in the annular space between the relatively rotating shaft and the conductive shell, and the conductive sliding component includes: an annular conductive lip portion, which is formed by a molded body of a conductive elastomer and can slide on the surface of the shaft; and a sealing device joint portion, which is arranged on the outer peripheral side of the conductive lip portion and can be joined to the sealing device main body at the side of the sealing device main body that closes the space opposite to the side of the sealed object fluid.

[0012] In one form of the conductive sliding component of the present invention, the sealing device joint portion comprises: a disk portion joint portion, which is a disk-shaped surface provided on the outer peripheral side of the conductive lip portion, and the disk portion joint portion can be joined to the disk portion of the sealing device main body at the side of the sealing device main body that closes the space opposite to the sealed object fluid side; and a cylindrical portion joint portion, which is provided on the outer peripheral side of the disk portion joint portion and can be joined to the surface on the outer peripheral side of the cylindrical portion of the sealing device main body.

[0013] In the conductive sliding member according to one aspect of the present invention, the cylindrical portion engaging portion has a cylindrical portion engaging portion that can engage with a cylindrical portion to be engaged, and the cylindrical portion to be engaged is provided on a surface on the outer peripheral side of the cylindrical portion of the sealing device main body.

[0014] In a conductive sliding component according to one aspect of the present invention, the disk portion joint portion has a disk portion engaging portion which engages with a disk portion engaged portion, and the disk portion engaged portion is provided on a surface of the disk portion of the sealing device body on the opposite side to the sealed fluid side.

[0015] In order to achieve the above-mentioned purpose, the sealing device of the present invention realizes the sealing of the annular space between a relatively rotating shaft and a conductive shell, and the sealing device includes: a sealing device main body, which can slide relative to the shaft and realize the sealing of the space; and a conductive sliding member, which is arranged on the side opposite to the sealed object fluid side than the sealing device main body and is formed by a molded body of a conductive elastomer, the sealing device main body has a sealing lip formed by an elastomer with lower conductivity than the conductive elastomer, and the conductive sliding member has: an annular conductive lip that can slide on the surface of the shaft; and a sealing device joint portion, which is arranged on the outer peripheral side of the conductive lip and can be joined to the sealing device main body at the side of the sealing device main body that is opposite to the sealed object fluid side and can close the space.

[0016] In a sealing device of one form of the present invention, in the conductive sliding component, the sealing device joint portion comprises: a disk portion joint portion, which is a disk-shaped surface provided on the outer peripheral side of the conductive lip portion and can be joined to the disk portion of the sealing device main body at the side of the sealing device main body that closes the space opposite to the sealed object fluid side; and a cylindrical portion joint portion, which is provided on the outer peripheral side of the disk portion joint portion and can be joined to the surface on the outer peripheral side of the cylindrical portion of the sealing device main body.

[0017] In a sealing device according to one aspect of the present invention, the cylindrical portion engaging portion includes a cylindrical portion engaging portion that can engage with a cylindrical portion to be engaged, and the cylindrical portion to be engaged portion is provided on a surface on an outer peripheral side of the cylindrical portion of the sealing device body.

[0018] In a sealing device of one form of the present invention, in the conductive sliding component, the disk portion joint portion has a disk portion snap-fitting portion, the disk portion snap-fitting portion can be snap-fitted with the disk portion snap-fitted portion, and the disk portion snap-fitted portion is provided on the surface of the disk portion of the sealing device main body on the side opposite to the sealed object fluid side.

[0019] In order to achieve the above-mentioned purpose, the manufacturing method of the sealing device of the present invention realizes the sealing of the annular space between the relatively rotating shaft and the conductive shell, wherein the manufacturing method of the sealing device performs the following steps: a step of preparing a conductive sliding component formed by a molded body of a conductive elastomer; a step of preparing a sealing device main body formed to be able to slide relative to the shaft and realize the sealing of the space; and a step of joining the sealing device main body to the conductive sliding component at the side of the sealing device main body opposite to the sealing object fluid side.

[0020] In a method for manufacturing a sealing device according to one aspect of the present invention, the conductive sliding component comprises: an annular conductive lip portion formed by a molded body of the conductive elastomer and capable of sliding on the surface of the shaft; and a conductive sliding member disposed on the outer peripheral side of the conductive lip portion and capable of being joined to the sealing device main body at the side of the sealing device main body opposite to the sealed object fluid side, and in the step of joining the sealing device main body and the conductive sliding member, the sealing device joining portion of the conductive sliding member is joined to the sealing device main body.

[0021] In a method for manufacturing a sealing device according to one aspect of the present invention, the sealing device main body has a reinforcement ring and a sealing main body, the reinforcement ring is composed of a cylindrical portion and a disc portion, the cylindrical portion is formed into a cylindrical shape with an axis as the center, the disc portion is provided at an end portion of the cylindrical portion on the side opposite to the sealed object fluid side and is formed into a disc shape, the sealing main body is an elastic body having lower conductivity than the conductive elastomer molded on the reinforcement ring, and has a sealing lip portion, and in the conductive sliding member, the sealing device joint portion has: a disc portion joint portion, which is provided at the The disk-shaped surface on the outer peripheral side of the conductive lip portion can be joined to the disk portion of the sealing device main body; and the cylindrical portion joining portion is provided on the outer peripheral side of the disk portion joining portion and can be joined to the surface on the outer peripheral side of the cylindrical portion of the sealing device main body. In the step of joining the sealing device main body and the conductive sliding member, the disk portion joining portion of the conductive sliding member is joined to the disk portion of the sealing device main body, and the cylindrical portion joining portion of the conductive sliding member is joined to the cylindrical portion of the sealing device main body.

[0022] In a method for manufacturing a sealing device according to one aspect of the present invention, the conductive sliding member comprises: a cylindrical portion engaging portion, which is formed at the cylindrical portion joint portion and can be engaged with the cylindrical portion of the sealing device main body; and a disc portion engaging portion, which is formed at the disc portion joint portion and can be engaged with the disc portion of the sealing device main body. In the step of engaging the sealing device main body with the conductive sliding member, the disc portion engaging portion of the conductive sliding member is engaged with the disc portion of the sealing device main body, and the cylindrical portion engaging portion of the conductive sliding member is engaged with the cylindrical portion of the sealing device main body.

[0023] Effects of the Invention

[0024] According to the conductive sliding member, the sealing device, and the method for manufacturing the sealing device of the present invention, conductivity can be easily imparted. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional view for showing a schematic structure of a sealing device including the conductive sliding member according to the first embodiment of the present invention.

[0026] Figure 2 It is a cross-sectional view of the conductive sliding member according to the first embodiment.

[0027] Figure 3 It is a partial cross-sectional view showing a speed reducer equipped with the sealing device according to the first embodiment.

[0028] Figure 4It is a cross-sectional view showing a usage state of the sealing device equipped with the conductive sliding member according to the first embodiment.

[0029] Figure 5 This is a cross-sectional view showing a state before the conductive sliding member and the sealing device main body are assembled in the method for manufacturing the sealing device according to the first embodiment.

[0030] Figure 6 This is a cross-sectional view showing a state after the conductive sliding member and the sealing device main body are assembled in the method for manufacturing the sealing device according to the first embodiment.

[0031] Figure 7 A flowchart showing the procedure of the method for manufacturing the sealing device according to the first embodiment.

[0032] Figure 8 It is a cross-sectional perspective view of a conductive sliding member and a sealing device according to a second embodiment of the present invention.

[0033] Fig. 9 It is a cross-sectional perspective view of a conductive sliding member and a sealing device according to a third embodiment of the present invention.

[0034] Fig.10 It is a cross-sectional view for showing a schematic structure of a sealing device including a conductive sliding member according to a fourth embodiment of the present invention.

[0035] Fig.11 It is a cross-sectional perspective view of a conductive sliding member and a sealing device according to a fifth embodiment of the present invention. DETAILED DESCRIPTION

[0036] Hereinafter, the embodiments of the present invention will be described with reference to the attached drawings. Figure 1 While explaining.

[0037] [First embodiment]

[0038] Figure 1 It is a cross-sectional view for showing the schematic structure of the sealing device 100 equipped with the conductive sliding member 10 according to the first embodiment of the present invention. Figure 2 2 is a cross-sectional view of the conductive sliding member 10 . Figure 3 1 is a partial cross-sectional view showing the reducer 1 equipped with the sealing device 100 . Figure 4 1 is a cross-sectional view showing a state of use of a sealing device 100 equipped with a conductive sliding member 10. The conductive sliding member 10 and the sealing device 100 of the first embodiment are substantially rotationally symmetrical. Figure 1 , Figure 2 and Figure 4, a cross-sectional view of the conductive sliding member 10 and the sealing device 100 cut along a plane including the central axis lines (hereinafter “axis line x”) of the conductive sliding member 10 and the sealing device 100 is shown.

[0039] like Figure 3 As shown, the sealing device 100 of the present embodiment is installed in a driving mechanism such as a reducer 1 of a vehicle equipped with an electric motor 2 such as an electric vehicle (EV) or a fuel cell vehicle (FCV). The reducer 1 includes, inside the housing 30: a first pinion 4 provided on the rotating shaft 3 of the motor 2, a first-stage gear 6 installed on the shaft 5 and meshing with the first pinion 4, a second pinion 7 provided on the shaft 5, a second-stage gear 8 installed on the shaft 20 as the output shaft and meshing with the second pinion 7, etc. The sealing device 100 constitutes a sealing structure in the reducer 1 for sealing the annular space S between the relatively rotating shaft 20 and the shaft hole 31 of the conductive housing 30. It should be noted that the sealing device 100 can also be installed instead of the sealing device 300 installed on the rotating shaft 3 side (motor 2 side). The housing 30 is fixed to the vehicle body (not shown) and is electrically conductive with the vehicle body. Figure 3 and Figure 4 Middle, left ( Figure 4 The arrow b direction in the figure is the sealing area where oil and other sealed fluids are sealed. The right side ( Figure 4 The arrow a direction in FIG. 1 is the area on the opposite side of the sealing area (the atmospheric area). The sealing device 100 is fixed to the inner circumferential surface 32 of the shaft hole 31 of the housing 30 by fitting. Furthermore, when the shaft 20 and the housing 30 rotate relative to each other, the sealing device 100 remains stationary relative to the housing 30 and slides between the sealing device 100 and the shaft 20.

[0040] For the convenience of explanation, Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in the direction of the axis x that becomes the atmospheric region, the direction of arrow a (one side in the axial direction) is set as the atmospheric side (outside), and in the direction of the axis x that becomes the sealing region when in use, the direction of arrow b (the other side in the axial direction) is set as the sealed object fluid side (inside). In this embodiment, the opposite side of the sealed object fluid side is the atmospheric side. In addition, in the direction perpendicular to the axis x (hereinafter also referred to as "radial"), the direction away from the axis x (arrow c direction) is set as the outer peripheral side, and the direction close to the axis x (arrow d direction) is set as the inner peripheral side.

[0041] like Figure 1 , Figure 2 and Figure 4As shown in FIG. 1 , the conductive sliding member 10 of the first embodiment of the present invention is formed to be mounted in the annular space S between the relatively rotating shaft 20 and the housing 30. The sealing device 100 includes a sealing device main body 200 and the conductive sliding member 10. The sealing device main body 200 has a sealing lip 201 formed of an elastic body having no conductivity, formed to be slidable relative to the shaft 20 and to achieve sealing of the annular space S. The conductive sliding member 10 includes: an annular conductive lip 11 formed of a molded body of an elastic body having conductivity (conductive elastic body) and formed to be slidable on the surface 21 of the shaft 20; and a sealing device joint 14 provided on the outer peripheral side of the conductive lip 11 and capable of being joined to the sealing device main body 200 at the side (atmosphere side) opposite to the sealed object fluid side of the sealing device 100 formed to close the annular space S. Hereinafter, the conductive sliding member 10, the sealing device 100 and the manufacturing method of the sealing device 100 will be specifically described.

[0042] <Sealing device>

[0043] like Figure 1 As shown, the sealing device 100 includes a sealing device main body 200 and a conductive sliding member 10. The sealing device main body 200 includes a reinforcement ring 211 and a sealing main body 220 formed of a rubber-like elastic body and provided integrally with the reinforcement ring 211.

[0044] The sealing device body 200 is, for example, a molded body obtained by insert molding a sealing body 220 formed of an elastomer having lower conductivity than an elastomer having conductivity, specifically, an elastomer having no conductivity, using a reinforcement ring 211 as an insert component.

[0045] The reinforcement ring 211 is composed of a cylindrical portion 212 and a disc portion 213. The cylindrical portion 212 is cylindrical or substantially cylindrical with the axis as the center, and the disc portion 213 is provided at the end of the cylindrical portion 212 on the atmosphere side and is disc-shaped or substantially disc-shaped.

[0046] The seal body 220 includes an outer peripheral seal portion 221 and a dustproof lip 223 in addition to the seal lip 201 .

[0047] The outer peripheral seal portion 221 is provided on the outer peripheral side of the cylindrical portion 212. The outer peripheral seal portion 221 is configured to be in close contact with the inner peripheral surface 32 of the shaft hole 31 of the housing 30. By providing the outer peripheral seal portion 221, the sealing device 100 is fixed to the inner peripheral surface 32 of the shaft hole 31 of the housing 30 by fitting, and leakage of the sealed object fluid from the space S between the sealing device 100 and the inner peripheral surface 32 is prevented.

[0048] The sealing lip 201 and the dustproof lip 223 are both configured to be slidable relative to the surface 21 of the shaft 20. The sealing lip 201 prevents leakage of the sealed fluid. In addition, a clamp spring 202 is provided on the surface side of the sealing lip 201 for pressing the radial inner front end of the sealing lip 201 against the shaft 20. The dustproof lip 223 prevents foreign matter (dust, etc.) from entering the sealing area side from the outside.

[0049] <Conductive sliding member>

[0050] like Figure 1 and Figure 2 As shown, the conductive sliding member 10 includes a reinforcement ring 12 and a member body 13 formed of a rubber-like conductive elastic body (preferably FKM or conductive fluororubber) provided integrally with the reinforcement ring 12 .

[0051] The member body portion 13 is, for example, a molded body obtained by insert molding using the reinforcement ring 12 as an insert component.

[0052] The reinforcement ring 12 is composed of a cylindrical portion 121 which is cylindrical or substantially cylindrical about the axis x and a disc portion 122 which is provided at the end of the cylindrical portion 121 on the atmosphere side and is disc-shaped or substantially disc-shaped.

[0053] The cylindrical portion 121 is a cylindrical surface provided on the outer peripheral side of the conductive lip portion 11. Figure 1 and Figure 4 As shown, the cylindrical portion 121 is a surface located on the outer peripheral side of the cylindrical portion 212 of the sealing device main body 200 when the conductive sliding member 10 is assembled to the sealing device main body 200 .

[0054] The disk portion 122 is a disk-shaped surface provided on the outer peripheral side of the conductive lip portion 11. Figure 1 and Figure 4 As shown, the disk portion 122 is located on the surface of the sealing device body 200 closer to the atmosphere (opposite to the sealed fluid side) than the disk portion 213 when the conductive sliding member 10 is assembled to the sealing device body 200 .

[0055] The sealing device joint portion 14 is formed so as to be able to join the conductive sliding member 10 to the sealing device main body 200 at the atmosphere side of the sealing device 100. The sealing device joint portion 14 is composed of a cylindrical portion joint portion 141 and a disk portion joint portion 142.

[0056] The cylindrical portion engaging portion 141 is formed to be engageable with a portion of the peripheral sealing portion 221 of the sealing device body 200 provided on the outer peripheral side of the cylindrical portion 212. Specifically, it is desirable that the cylindrical portion engaging portion 141 is shaped to be engageable with a cylindrical portion to be engaged 224 formed on a portion of the peripheral sealing portion 221 closer to the atmosphere.

[0057] It is desired that the disk portion joint portion 142 is shaped so as to be capable of being joined to a disk portion joined portion 225 formed on the surface (the surface on the atmosphere side) of the disk portion 213 of the sealing device main body 200 at the atmosphere side (the side opposite to the sealed object fluid side) of the sealing device main body 200 in the annular space S between the closed shaft 20 and the housing 30.

[0058] The cylindrical engaging portion 141 has a cylindrical engaging portion 143 that engages with the shape of the surface of the outer circumferential side of the cylindrical engaged portion 224 (concavoconvex shape: cylindrical engaged portion 227). It should be noted that, in this embodiment, the cylindrical engaged portion 227 and the cylindrical engaging portion 143 are not limited to the cylindrical engaged portion 227 and the cylindrical engaging portion 143 as long as they can engage with each other. Figure 1 to Figure 4 Shape shown.

[0059] The disk engaging portion 142 has a disk engaging portion 144 that engages with the concave disk engaging portion 226 provided on the disk engaging portion 225. It should be noted that, regarding the disk engaging portion 226 and the disk engaging portion 144, in the present embodiment, the disk engaging portion 226 is concave and the disk engaging portion 144 is convex, but the disk engaging portion 226 may be convex and the disk engaging portion 144 may be concave.

[0060] The member body 13 includes a conductive lip 11 and a housing contact portion 131. The conductive lip 11 is configured to be slidable relative to the surface 21 of the shaft 20. The conductive lip 11 may be provided with a concavo-convex surface on the contact surface with the surface 21 of the shaft 20. The housing contact portion 131 is provided in the member body 13 at a position closer to the outer peripheral side than the conductive lip 11, specifically, at a position that can contact the inner peripheral surface 32 of the shaft hole 31 of the housing 30 when in use. In the member body 13 formed of a conductive elastic body, the conductive lip 11 contacts the surface 21 of the shaft 20, and the housing contact portion 131 contacts the inner peripheral surface 32 of the housing 30, thereby forming a conductive path from the shaft 20 to the housing 30 via the conductive sliding member 10. As described above, the housing 30 is fixed to the vehicle body (not shown) of the vehicle and is electrically connected to the vehicle. Therefore, in a vehicle equipped with the reducer 1 equipped with the sealing device 100, a conductive path for grounding is formed via the shaft 20 and the conductive sliding member 10. That is, according to this embodiment, the induced current from the motor or the like that causes high-frequency noise and bearing corrosion flows through the conductive path to the housing 30. Therefore, according to the embodiment, the induced current from the motor or the like that causes high-frequency noise and bearing corrosion can be reduced.

[0061] Next, a method for manufacturing the sealing device 100 including the conductive sliding member 10 described above will be described.

[0062] Figure 5 It is a cross-sectional view showing a state before the conductive sliding member 10 and the sealing device main body 200 are assembled in the method for manufacturing the sealing device 100 according to the first embodiment. Figure 6 This is a cross-sectional view showing a state after the conductive sliding member 10 and the sealing device main body 200 are assembled in the method for manufacturing the sealing device 100 according to the first embodiment. Figure 7 It is a flowchart showing the procedure of the method for manufacturing the sealing device 100 according to the first embodiment.

[0063] like Figure 5 and Figure 7 As shown, in the manufacture of the sealing device 100, the reinforcing ring 12 is prepared as an insert component, and the conductive sliding member 10 is formed of the member body 13 by insert molding from an elastic body having conductivity (step S101). In the manufacture of the sealing device 100, the reinforcing ring 211 is prepared as an insert component, and the sealing device body 200 is formed of the sealing body 220 by insert molding from an elastic body having no conductivity (step S102). Then, as shown in FIG. Figure 6As shown, the conductive sliding member 10 prepared in advance is joined to the sealing device main body 200 (step S103). Specifically, in step S103, the disk portion joining portion 142 of the conductive sliding member 10 is joined to the disk portion 213 of the sealing device main body 200, and the cylindrical portion joining portion 141 of the conductive sliding member 10 is joined to the cylindrical portion 212 of the sealing device main body 200. When the conductive sliding member 10 is joined to the sealing device main body 200, the disk portion engaged portion 226 provided in the disk portion engaged portion 225 of the sealing device main body 200 is engaged with the disk portion engaging portion 144 provided in the disk portion joining portion 142 of the conductive sliding member 10. Furthermore, the cylindrical engaged portion 227 provided in the cylindrical engaged portion 224 of the sealing device main body 200 is engaged with the cylindrical engaging portion 143 provided in the cylindrical engaging portion 141 of the conductive sliding member 10 .

[0064] After the conductive sliding member 10 is assembled with the sealing device main body 200, Figure 4 As shown, the sealing device 100 is provided in the annular space S between the shaft 20 and the housing 30 .

[0065] According to the sealing device 100 configured as described above, when the conductive sliding member 10 is provided in the annular space S between the shaft 20 and the housing 30, it can be directly installed in a state where the conductive sliding member 10 and the sealing device main body 200 are assembled. Specifically, in the sealing device 100, the member main body 13 including the conductive lip 11 of the conductive sliding member 10 is a molded body formed of an elastic body having conductivity. Therefore, compared with the conventional conductive sliding member formed of a conductive brush or fiber, the deformation of the member main body 13 is suppressed, and it is easy to be attached to the sealing device main body 200.

[0066] The conductive sliding member 10 can be easily mounted and positioned in the sealing device main body 200 by including the cylindrical engaging portion 143 provided in the cylindrical engaging portion 141 and the disc engaging portion 144 provided in the disc engaging portion 142. That is, according to the sealing device 100 equipped with the conductive sliding member 10, the manufacturing work and the assembly work in the annular space S do not require proficiency. In addition, according to the sealing device 100 equipped with the conductive sliding member 10, the conductive sliding member 10 can be directly installed in the annular space S in a state where the conductive sliding member 10 is assembled in the sealing device main body 200, so the time required for the installation work can be shortened.

[0067] The improvement in ease of assembly work to the sealing device 100 and installation work to the annular space S by the conductive sliding member 10 described above is particularly significant when the installation space of the sealing device 100 (the annular space S and the space around it) is small.

[0068] The conductive sliding member 10 can be easily positioned to the sealing device main body 200, so by making the dimensions of the conductive lip 11 and the sealing lip 201 of the sealing device main body 200 consistent with the dimensions of the shaft 20, it can be used as a sealing device having conductivity and can be easily assembled to other sealing device main bodies having different specifications. In other words, in the sealing device 100, since the conductive sliding member 10 and the sealing device main body 200 can be produced separately, by changing only the specifications of the conductive sliding member 10 without changing the specifications of the sealing device main body 200 that realizes the sealing of the sealed object fluid, it is possible to provide conductivity that meets the requirements and specifications for dealing with noise from the motor 2, etc., without impairing the sealing performance of the sealed object fluid.

[0069] In addition, according to the conductive sliding member 10, by assembling it to the existing sealing device main body 200, it is possible to impart conductivity that meets the requirements and specifications for dealing with noise from the motor 2 without impairing the sealing performance of the sealed object fluid. In this case, the conductive sliding member 10 has the cylindrical portion engaging portion 143 provided in the cylindrical portion engaging portion 141 and the disk portion engaging portion 144 provided in the disk portion engaging portion 142, so that it can be easily mounted and positioned in the sealing device main body 200.

[0070] Therefore, according to the sealing device 100 including the conductive sliding member 10 and the method for manufacturing the sealing device, conductivity can be easily added.

[0071] [Second Embodiment]

[0072] Next, a sealing device 100B equipped with a conductive sliding member 10B according to a second embodiment of the present invention will be described. Hereinafter, for the structures having the same or similar functions as the conductive sliding member 10, the sealing device main body 200, and the sealing device 100 according to the first embodiment described above, the same reference numerals are given and their descriptions are omitted, and only the different structures will be described.

[0073] Figure 8 It is a cross-sectional perspective view of a sealing device 100B including a conductive sliding member 10B according to a second embodiment of the present invention.

[0074] exist Figure 8 In the sealing device 100B equipped with the conductive sliding member 10B shown, the structure of the disk portion engaging portion 144B provided in the disk portion engaging portion 142 of the conductive sliding member 10B and the structure of the disk portion engaging portion 226B provided in the disk portion engaged portion 225 of the sealing device main body 200B are different from those of the sealing device 100 equipped with the conductive sliding member 10 described above.

[0075] Specifically, the disk-engaging portion 144B is disposed closer to the inner circumference in the disk-engaging portion 142 of the member body 13 of the conductive sliding member 10B. The disk-engaging portion 144B is formed into a convex shape toward the sealing device body 200B side (outer circumference side) in the assembled state. The disk-engaged portion 226B is formed into a concave shape toward the conductive sliding member 10B side (inner circumference side) in the assembled state in a manner capable of receiving the disk-engaging portion 144B. The disk-engaging portion 144B and the disk-engaged portion 226B are disposed on the inner circumference side of the cylindrical-engaging portion 143 and the cylindrical-engaged portion 227.

[0076] Furthermore, according to the sealing device 100B including the conductive sliding member 10B of the second embodiment, conductivity can be easily added, similarly to the sealing device 100 including the conductive sliding member 10 described above.

[0077] [Third Embodiment]

[0078] Next, a sealing device 100C equipped with a conductive sliding member 10C according to a third embodiment of the present invention will be described. Hereinafter, the same reference numerals are given to the structures having the same or similar functions as the conductive sliding members 10, 10B, the sealing device main body 200, 200B, and the sealing device 100, 100B according to the first and second embodiments described above, and their descriptions are omitted, and only the different structures will be described.

[0079] Fig. 9 It is a cross-sectional perspective view of a sealing device 100C including a conductive sliding member 10C according to a third embodiment of the present invention.

[0080] exist Fig. 9 In the sealing device 100C equipped with the conductive sliding member 10C shown, the material constituting the member body 13C of the conductive sliding member 10C is an elastic body having conductivity (for example, a rubber-like conductive elastic body having conductivity, or a conductive resin such as conductive PTFE). In the sealing device 100C equipped with the conductive sliding member 10C, the structure of the disk portion engaging portion 144C provided in the disk portion engaging portion 142 of the conductive sliding member 10C and the structure of the disk portion engaged portion 226C provided in the disk portion engaged portion 225 of the sealing device body 200C are mainly different from those of the sealing device 100 equipped with the conductive sliding member 10 described above.

[0081] Specifically, the disk-engaging portion 144C is attached to the sealing target fluid side of the disk-engaging portion 122 of the reinforcement ring 12. Therefore, the disk-engaging portion 144C is convexly shaped to protrude from the disk-engaging portion 122 toward the sealing target fluid side. The disk-engaged portion 226C is formed into a concave shape toward the conductive sliding member 10C side (inner peripheral side) in the assembled state so as to be able to receive the disk-engaging portion 144C.

[0082] Furthermore, according to the sealing device 100C equipped with the conductive sliding member 10C of the third embodiment, conductivity can be easily added in the same manner as the sealing device 100 equipped with the conductive sliding member 10 described above. In addition, according to the sealing device 100C, the distance between the metal reinforcement ring 12 and the shaft is shortened in the use state, thereby shortening the conductive path from the conductive lip 11 to the housing, and further improving the conductivity.

[0083] [Fourth Embodiment]

[0084] Next, a sealing device 100D equipped with a conductive sliding member 10 according to a fourth embodiment of the present invention will be described. Hereinafter, the same reference numerals are given to the structures having the same or similar functions as the conductive sliding member 10, the sealing device main body 200, and the sealing device 100 according to the first embodiment described above, and their descriptions are omitted, and only the different structures will be described.

[0085] Fig.10 It is a cross-sectional view of a sealing device 100D including a conductive sliding member 10 according to a fourth embodiment of the present invention.

[0086] exist Fig.10 In the sealing device 100D shown, the sealing device main body 200D is a dustproof seal that suppresses the intrusion of dust or dirt from the atmosphere side to the sealed fluid side by the dustproof lip 223. That is, in the sealing device 100D, the sealing body 220D of the sealing device main body 200D is not provided with the sealing lip 201 and the retaining spring 202 provided in the sealing device 100 equipped with the conductive sliding member 10 described above. The conductive sliding member 10 is not limited to the example of being used in combination with the oil seal that suppresses the leakage of the sealing fluid such as oil from the sealed fluid side to the atmosphere side by the sealing lip 201 such as the sealing device main body 200 in the sealing device 100 described above, and can also be used in combination with a dustproof seal such as the sealing device main body 200D.

[0087] Furthermore, according to the sealing device 100D including the conductive sliding member 10 of the fourth embodiment, conductivity can be easily provided to the sealing device main body 200D, similarly to the sealing device 100 described above.

[0088] [Fifth Embodiment]

[0089] Next, a sealing device 100E equipped with a conductive sliding member 10C according to a fifth embodiment of the present invention will be described. Hereinafter, for structures having the same or similar functions as the sealing device main body 200C and the sealing device 100C according to the third embodiment described above, the same reference numerals are given and their descriptions are omitted, and only the different structures will be described.

[0090] Fig.11 It is a cross-sectional perspective view of a sealing device 100E including a conductive sliding member 10C according to a fifth embodiment of the present invention.

[0091] exist Fig.11 In the sealing device 100E equipped with the conductive sliding member 10C shown in the figure, the sealing device main body 200E is a dustproof seal that suppresses the intrusion of dust or dirt from the atmosphere side to the sealed fluid side by the dustproof lip 223E. That is, in the sealing device 100E, the sealing body 220E of the sealing device main body 200E is not provided with the sealing lip 201 and the retaining spring 202, but is provided with the dustproof lip 223E instead, which is different from the conductive sliding member 10C described above. The conductive sliding member 10C is not limited to the example of being used in combination with the oil seal that suppresses the leakage of the sealing fluid such as oil from the sealed fluid side to the atmosphere side by the sealing lip 201 like the sealing device main body 200C in the sealing device 100C described above, and can also be used in combination with a dustproof seal like the sealing device main body 200E.

[0092] Furthermore, according to the sealing device 100E of the fifth embodiment, conductivity can be easily provided to the sealing device main body 200E, similarly to the sealing device 100C including the conductive sliding member 10C described above.

[0093] The above describes the embodiments of the present invention, but the present invention is not limited to the above embodiments, but includes all the modes included in the concept and claims of the present invention. In addition, in order to make at least a part of the above-mentioned subjects and effects work, the various structures can also be appropriately combined selectively. For example, the shape, material, configuration, size, etc. of each structural element of the above-mentioned embodiment can be appropriately changed according to the specific use mode of the present invention.

[0094] For example, in the above-mentioned embodiment, an example is described in which the sealing device joint portion 14 is composed of the cylindrical joint portion 141 and the disk joint portion 142. Since the sealing device joint portion 14 can be used as long as it can join the conductive sliding member 10 to the sealing device main body 200, it is not limited to this example. The sealing device joint portion can be joined, for example, by a protrusion and a recessed portion provided in the sealing device main body, or can be formed to be able to fit with the sealing device main body.

[0095] For example, in the above-mentioned embodiment, an example is described in which the cylindrical engaging portion 143 is provided in the cylindrical engaging portion 141. In the conductive sliding member, the cylindrical engaging portion is not limited to this example, and may not have a claw-shaped or concave-convex portion that engages with the sealing device main body, but may only be able to contact the sealing device main body.

[0096] For example, in the above-mentioned embodiment, an example is described in which the disk portion engaging portion 144 is provided in the disk portion joint portion 142. In the conductive sliding member, the disk portion engaging portion is not limited to this example, and may not have a claw-shaped or concave-convex portion that engages with the sealing device main body and may only be able to contact with the sealing device main body.

[0097] For example, in the above-mentioned embodiment, the case contact portion 131 is formed of an elastic body having conductivity so as to contact with the case 30 to form a conductive path. In the conductive sliding member, the conductive path from the shaft 20 to the case 30 is not limited to this example. For example, the conductive path may be formed by contacting the case 30 with a conductive (metal) reinforcement ring 12 electrically connected to the member body 13. In addition, the conductive sliding member 10 may also form a conductive path by electrically contacting the reinforcement ring 211 of the sealing device body 200 with the reinforcement ring 12 of the conductive sliding member when the metal reinforcement ring 211 of the sealing device body 200 is exposed from the outer peripheral sealing portion 221.

[0098] Description of Reference Numerals

[0099] 1: reducer, 2: motor, 3: rotating shaft, 4: first pinion, 5, 20: shaft, 6: first stage gear, 7: second pinion, 8: second stage gear, 10, 10B, 10C: conductive sliding member, 11: conductive lip, 12: reinforcement ring, 13, 13C: member body, 14: sealing device joint, 21: surface, 30: housing, 31: shaft hole, 32: inner circumferential surface, 100, 100B, 100C, 100D, 100E, 300: sealing device, 121: cylinder, 122: disk, 131: housing contact, 141: cylinder joint, 142: disk joint 143: cylindrical engaging portion, 144, 144B, 144C: ​​disc engaging portion, 200, 200B, 200C, 200D, 200E: sealing device body, 201: sealing lip, 202: clamping spring, 211: reinforcement ring, 212: cylindrical portion, 213: disc portion, 220, 220D, 220E: sealing body, 221: peripheral sealing portion, 223, 223E: dustproof lip, 224: cylindrical engaged portion, 225: disc engaged portion, 226, 226B, 226C: disc engaged portion, 227: cylindrical engaged portion, S: space, x: axis

Claims

1. A conductive sliding member installed in an annular space between a relatively rotating shaft and a conductive housing, wherein: The conductive sliding member comprises: an annular conductive lip portion formed of a molded body of an electrically conductive elastic body and capable of sliding on the surface of the shaft; and The sealing device joint portion is provided on the outer peripheral side of the conductive lip portion and can be joined to the sealing device main body portion at a side of the sealing device main body portion that closes the space, which side is opposite to the sealed fluid side.

2. The conductive sliding member according to claim 1, wherein The sealing device joint portion has: a disk-shaped engaging portion, which is a disk-shaped surface provided on the outer peripheral side of the conductive lip, and which can be engaged with the disk portion of the sealing device main body at the side of the sealing device main body that closes the space opposite to the sealed object fluid side; and The cylindrical portion engaging portion is provided on the outer peripheral side of the disk portion engaging portion and is engageable with a surface on the outer peripheral side of the cylindrical portion of the sealing device main body.

3. The conductive sliding member according to claim 2, wherein The cylindrical portion engaging portion includes a cylindrical portion engaging portion that can engage with a cylindrical portion to be engaged, and the cylindrical portion to be engaged is provided on a surface on an outer peripheral side of the cylindrical portion of the sealing device main body.

4. The conductive sliding member according to claim 2, wherein The disk-joining portion includes a disk-engaging portion that can engage with a disk-engaged portion provided on a surface of the disk portion of the sealing device body on a side opposite to the sealed fluid side.

5. A sealing device for sealing an annular space between a relatively rotating shaft and a conductive housing, wherein: The sealing device comprises: a sealing device body capable of sliding relative to the shaft and sealing the space; and The conductive sliding member is provided on the side opposite to the sealed fluid side of the sealing device main body and is formed of a molded body of a conductive elastic body. The sealing device main body has a sealing lip formed of an elastic body having lower conductivity than the conductive elastic body. The conductive sliding component comprises: an annular conductive lip portion capable of sliding on the surface of the shaft; and a sealing device joint portion, which is arranged on the outer peripheral side of the conductive lip portion and can be joined to the sealing device main body at the side of the sealing device main body capable of closing the space opposite to the sealed object fluid side.

6. The sealing device according to claim 5, wherein: In the conductive sliding member, The sealing device joint part comprises: a disk joint part, which is a disk-shaped surface provided on the outer peripheral side of the conductive lip part and can be joined to the disk part of the sealing device main body at the side of the sealing device main body that closes the space opposite to the sealed object fluid side; The cylindrical portion engaging portion is provided on the outer peripheral side of the disk portion engaging portion and can be engaged with the surface on the outer peripheral side of the cylindrical portion of the sealing device main body.

7. The sealing device according to claim 6, wherein: In the conductive sliding member, The cylindrical portion engaging portion includes a cylindrical portion engaging portion that can engage with a cylindrical portion to be engaged, and the cylindrical portion to be engaged is provided on a surface on an outer peripheral side of the cylindrical portion of the sealing device main body.

8. The sealing device according to claim 6, wherein: In the conductive sliding member, The disk-joining portion includes a disk-engaging portion that can engage with a disk-engaged portion provided on a surface of the disk portion of the sealing device body on a side opposite to the sealed fluid side.

9. A method for manufacturing a sealing device, for sealing an annular space between a relatively rotating shaft and a conductive housing, wherein: The manufacturing method of the sealing device performs the following steps: A step of preparing a conductive sliding member formed of a molded body of a conductive elastic body; A step of preparing a sealing device body that is slidable relative to the shaft and seals the space; and The step of joining the sealing device main body to the conductive sliding member at a side of the sealing device main body opposite to a sealed fluid side.

10. The method for manufacturing a sealing device according to claim 9, wherein: The conductive sliding member has: an annular conductive lip portion formed by a molded body of the conductive elastic body and capable of sliding on the surface of the shaft; and a sealing device engaging portion provided on the outer peripheral side of the conductive lip portion and capable of engaging with the sealing device main body portion at the side of the sealing device main body portion opposite to the sealed object fluid side, In the step of joining the sealing device main body and the conductive sliding member, the sealing device joining portion of the conductive sliding member is joined to the sealing device main body.

11. The method for manufacturing a sealing device according to claim 10, wherein: The sealing device main body has a reinforcement ring and a sealing main body. The reinforcement ring is composed of a cylindrical portion and a disc portion, the cylindrical portion is formed into a cylindrical shape with the axis as the center, the disc portion is provided at the end of the cylindrical portion on the side opposite to the sealed object fluid side and is formed into a disc shape, the sealing body portion is an elastic body with lower conductivity than the conductive elastic body molded on the reinforcement ring, and has a sealing lip portion, In the conductive sliding member, The sealing device joint part comprises: a disk joint part, which is a disk-shaped surface provided on the outer peripheral side of the conductive lip part and can be joined to the disk part of the sealing device main body; and a cylindrical joint part, which is provided on the outer peripheral side of the disk joint part and can be joined to the surface on the outer peripheral side of the cylindrical part of the sealing device main body. In the step of joining the sealing device main body and the conductive sliding member, the disk portion joining portion of the conductive sliding member is joined to the disk portion of the sealing device main body, and the cylindrical portion joining portion of the conductive sliding member is joined to the cylindrical portion of the sealing device main body.

12. The method for manufacturing a sealing device according to claim 11, wherein: The conductive sliding member has a cylindrical engaging portion and a disc engaging portion. The cylindrical portion engaging portion is formed at the cylindrical portion joint portion and can be engaged with the cylindrical portion of the sealing device main body, and the disc portion engaging portion is formed at the disc portion joint portion and can be engaged with the disc portion of the sealing device main body. In the step of joining the sealing device main body and the conductive sliding member, the disk portion engaging portion of the conductive sliding member is engaged with the disk portion of the sealing device main body, and the cylindrical portion engaging portion of the conductive sliding member is engaged with the cylindrical portion of the sealing device main body.

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