TW201814190A - Sealing member and sealing member mechanism can be used for preventing a fluid stored in a device from flowing out or preventing the fluid from flowing into the device - Google Patents

Abstract

The present invention discloses a sealing member, which comprises: a sealing component surrounding a specified rotation shaft; and an oil ring including a sleeve part slidably contacting with the above-mentioned sealing component , and a flange part protruded from the above-mentioned sleeve part to the above-mentioned rotation shaft. Accordingly, this invention can be used for preventing a fluid stored in a device from flowing out or preventing the fluid from flowing into the device. Also disclosed is a sealing member mechanism comprising: a sealing member according to claim 1; and a shaft member having an outer circumferential surface surrounded by the sleeve part; and the flange part is housed in a space formed by recess part which is disposed in a manner of being recessed from the outer circumferential surface.

Description

Seals and seal mechanisms

The present invention relates to a sealing technique for preventing the outflow of fluid contained in a device or the inflow of fluid into the device.

Seals are used in various technical fields. If the device incorporating the seal rotates at high speed, or runs for a long time without maintenance, the high wear resistance of the interface between the seal and the surface of the device is required. If the device incorporating the seal is used in an environment full of corrosive gases or liquids, a high corrosion resistance between the seal and the surface of the device is required. Japanese Patent Laid-Open No. 2016-84911 discloses a technology that can be preferably used in a use environment requiring high wear resistance and / or corrosion resistance. Japanese Patent Laid-Open No. 2016-84911 discloses a seal having a sealing member and a slinger surrounded by the sealing member. The slinger comprises: a sleeve surrounding the shaft; and a flange bent toward the casing surrounding the shaft. The flange improves the rigidity of the oil slinger, so even if the operator applies force to the seal when the operator puts the seal into the device, the seal is not easily deformed. In the technique of Japanese Patent Laid-Open No. 2016-84911, a large-sized casing is required to avoid contact between the flange and the casing. Therefore, the technique of Japanese Patent Laid-Open No. 2016-84911 is not suitable for a device requiring miniaturization.

The object of the present invention is to provide a sealing technology which can be preferably applied to devices requiring miniaturization. A seal according to one aspect of the present invention includes: a seal member surrounding a specific rotation axis; and an oil slinger including a sleeve portion slidingly contacted by the seal member, and protruding from the sleeve portion toward the rotation shaft. Of the flange. A seal mechanism according to another aspect of the present invention includes: the above-mentioned seal; and a shaft member having an outer peripheral surface surrounded by the sleeve portion. The flange portion is housed in a space formed by a recessed portion provided to be recessed from the outer peripheral surface. The above-mentioned sealing technology can be preferably applied to devices requiring miniaturization.

FIG. 1 is a schematic cross-sectional view of an exemplary seal mechanism 100. The seal mechanism 100 will be described with reference to FIG. 1. The seal mechanism 100 includes a seal 200, a shaft member 300, and a case 400. The seal 200, the shaft member 300, and the housing 400 form part of the device. The device can be a reducer or other devices. The principle of this embodiment is not limited to a specific device for constructing the seal mechanism 100. The shaft member 300 is disposed on a specific rotation axis RAX. The shaft member 300 may be a cylindrical member or a cylindrical member. The principle of this embodiment is not limited to a specific shape of the shaft member 300. The rotation axis RAX corresponds to a central axis of the shaft member 300. The housing 400 is disposed on the outer side of the shaft member 300 in the radial direction (upper and lower directions in FIG. 1) so as to be substantially coaxial with the shaft member 300. At least one of the shaft member 300 and the housing 400 rotates about the rotation axis RAX. That is, if the shaft member 300 is fixed, the housing 400 can also rotate about the rotation axis RAX. When the case 400 is fixed, the shaft member 300 can also rotate about the rotation axis RAX. The housing 400 is formed in a ring shape, and forms an internal space that partially houses the shaft member 300. That is, a part of the shaft member 300 is inserted into the inner space of the case 400. Various parts used as a part of the device may be further accommodated in the inner space of the case 400. For example, a gear member connected to the shaft member 300 may be disposed in the housing 400. The seal 200 separates the internal space from the external space outside the housing 400. The boundary between the internal space and the external space of the shaft member 300 and the housing 400 forms an annular space. The seal 200 is embedded in the annular space. Thereby, the internal space is isolated from the external space by the seal 200. The shaft member 300 extends in the direction of the rotation axis RAX and includes an outer peripheral surface 310 in close contact with the seal 200. A sealing adhesive is applied to the outer peripheral surface 310 to form an adhesive layer AHL. The housing 400 includes an inner peripheral surface 410 that cooperates with the outer peripheral surface 310 of the shaft member 300 and radially interposes the seal 200. The annular space is formed between the outer peripheral surface 310 and the inner peripheral surface 410. In other words, the inner peripheral surface 410 of the housing 400 faces the radial direction of the outer peripheral surface 310 of the shaft member 300 and faces the radial direction. A seal 200 is disposed in the annular space. The seal 200 includes a seal member 210 and a slinger 220. The sealing member 210 is an annular member having an outer peripheral surface that abuts against the inner peripheral surface 410 of the case 400 as a whole. The sealing member 210 surrounds the rotation axis RAX. The rotation axis RAX corresponds to a central axis of the sealing member 210. The slinger 220 is disposed radially inward of the seal member 210. The slinger 220 includes a cylindrical sleeve portion 221 that extends in the direction of the rotation axis RAX, and a flange portion 222 that extends from the inner end of the sleeve portion 221 in the extending direction (that is, the end portion that appears in the internal space). It is bent inward in the radial direction and protrudes toward the rotation axis RAX. The sleeve portion 221 is sandwiched between the seal member 210 and the shaft member 300 over the entire circumference. The sleeve portion 221 includes an inner peripheral surface 223 that faces the shaft member 300 side, and an outer peripheral surface 224 that is a surface on the side opposite to the inner peripheral surface 223 and faces the seal member 210 side. The inner peripheral surface 223 of the sleeve portion 221 is entirely bonded to the outer peripheral surface 310 of the shaft member 300 by the bonding layer AHL. Therefore, the outer peripheral surface 310 of the shaft member 300 is surrounded by the sleeve portion 221. While at least one of the shaft member 300 and the housing 400 rotates, the outer peripheral surface 224 of the sleeve portion 221 is slidably contacted by the sealing member 210. An annular recessed portion 320 which is recessed from the outer peripheral surface 310 of the shaft member 300 toward the rotation axis RAX is formed in the shaft member 300. The recessed portion 320 of the shaft member 300 includes an annular first surface 321 along a virtual plane PLN orthogonal to the rotation axis RAX. The recessed portion 320 of the shaft member 300 further includes a second surface 322 formed from an inner peripheral edge of the first surface 321 toward the internal space and formed by a generatrix extending substantially parallel to the rotation axis RAX. The recessed portion 320 forms an annular space partially surrounded by the first surface 321 and the second surface 322. The flange portion 222 is complementary to the recessed portion 320. The flange portion 222 is accommodated in a space formed by the recessed portion 320. The flange portion 222 has a first flange surface facing the first surface 321 and a second flange surface (a surface facing the inner space side) opposite to the first flange surface. The first and second flange surfaces are surfaces perpendicular to the rotation axis RAX. The flange portion 222 may be bonded to the first surface 321 by the bonding layer AHL. The shaft member 300 includes a third surface 323 that is bent from the second surface 322 toward the rotation axis RAX and is substantially parallel to the first surface 321. The virtual plane PLN shown in FIG. 1 is defined between the first surface 321 and the third surface 323. FIG. 1 shows the width W of the recessed portion 320. The width W can be defined as the distance between the first surface 321 and the third surface 323 in the extension direction of the rotation axis RAX, and can also be defined as the length of the generatrix forming the second surface 322. The thickness of the flange portion 222 may be equal to or smaller than the width W. In this case, the flange portion 222 does not protrude further to the inner space side than the third surface 323 in the extending direction of the rotation axis RAX. As a result, the internal space surrounded by the case 400 is effectively used for arranging various parts. This helps reduce the axial length of the device that constructs the seal mechanism 100 (ie, the size of the device in the extension direction of the rotation axis RAX). The sealing member 210 includes a main ring portion 211, a ring-shaped main lip 212, a ring-shaped dust lip 213, and a spring ring 214. The main ring portion 211 is an L-shaped portion in a sectional view of FIG. 1 and includes a first portion 215 and a second portion 216 extending perpendicularly to the first portion 215. The first portion 215 is a cylindrical portion extending along the inner peripheral surface 410 of the housing 400 and having a central axis substantially coincident with the rotation axis RAX. The outer peripheral surface of the first portion 215 abuts the inner peripheral surface 410 of the housing 400 substantially integrally. The second portion 216 is a ring-shaped portion that is bent radially inward from the outer end (that is, the end portion that appears in the external space) in the extending direction of the first portion 215 and protrudes toward the rotation axis RAX. The second portion 216 includes an inner peripheral end 217 that is radially opposed to the outer peripheral surface 224 of the sleeve portion 221. The dust lip 213 and the main lip 212 are connected to the inner peripheral end 217. The dust lip 213 has the inner peripheral end 217 of the main ring portion 211 (the second portion 216) protruding obliquely toward the outer space and the rotation axis RAX. The dust lip 213 is used to prevent foreign matter such as dust floating in the external space from entering the internal space. The front end of the dust lip 213 is in contact with the outer peripheral surface 224 of the sleeve portion 221. While at least one of the shaft member 300 and the housing 400 is rotating, the front end of the dust lip 213 rubs against the outer peripheral surface 224 of the sleeve 221. The slinger 220 is formed of a material with better wear resistance than the shaft member 300. Therefore, the slinger 220 hardly wears even under the sliding contact of the dust lip 213 to the sleeve portion 221. The main lip 212 includes a crimp ring 218 and a connecting ring 219. The crimp ring 218 abuts the outer peripheral surface 224 of the sleeve portion 221 between the dust lip 213 and the internal space. The connecting ring 219 connects the crimp ring 218 to the inner peripheral end 217 of the main ring portion 211. That is, the inner ring end 217 of the connecting ring 219 from the main ring portion 211 extends to the internal space, and a crimp ring 218 is provided at the protruding end thereof. The spring ring 214 is attached to the crimp ring 218. The spring ring 214 surrounding the crimp ring 218 applies a force toward the rotation axis RAX over the entire circumference of the crimp ring 218. As a result, the crimp ring 218 is in close contact with the outer peripheral surface 224 of the sleeve portion 221, and a seal structure is formed at the boundary between the crimp ring 218 and the outer peripheral surface 224 of the sleeve portion 221. A liquid (for example, a lubricating liquid) stored in the internal space is blocked by a sealing structure formed at a boundary between the crimp ring 218 and the outer peripheral surface 224 of the sleeve portion 221, and does not leak to the external space. While at least one of the shaft member 300 and the housing 400 is rotating, the pressure contact ring 218 and the outer peripheral surface 224 of the sleeve portion 221 are strongly rubbed. Since the oil slinger 220 is formed of a material having better wear resistance than the shaft member 300, the oil slinger 220 hardly wears even under the sliding contact of the crimp ring 218 to the sleeve portion 221. As shown in FIG. 1, an imaginary plane PLN overlaps the flange portion 222 and the crimp ring 218. This means that the area indicated by the width W is used not only for the arrangement of the flange portion 222 but also for the arrangement of the crimp ring 218. Both the flange portion 222 and the crimp ring 218 include a portion located on the virtual plane PLN. The crimp ring 218 includes a portion located between the first flange surface and the second flange surface. Regarding the previous oil slinger having a flange portion bent toward the housing, if the crimp ring 218 protrudes toward a region indicated by the width W, the flange portion interferes with the crimp ring 218. On the other hand, according to the principle of this embodiment, since the flange portion 222 is bent toward the rotation axis RAX, the flange portion 222 does not interfere with the crimp ring 218. The area indicated by the width W is effectively used in the configuration of the flange portion 222 and the crimp ring 218, so the designer can adjust the length of the shaft of the device that constructs the seal mechanism 100 (that is, the extension direction of the rotation axis RAX) The size of the device) gives a smaller value. In the above-mentioned embodiment, an adhesive layer AHL having a sealing property is formed between the seal 200 and the outer peripheral surface 310 of the shaft member 300, and the boundary between these is sealed. However, instead of the adhesive layer AHL, a rubber member having sealing properties may be disposed between the seal member 200 and the outer peripheral surface 310 of the shaft member 300. The principle of the above embodiment is not limited to a specific sealing member arranged between the seal 200 and the outer peripheral surface 310 of the shaft member 300. The general description of the above embodiment is as follows. The seal according to the above-mentioned embodiment includes a sealing member that surrounds a specific rotation axis, and an oil slinger including a sleeve portion slidingly contacted by the sealing member, and a flange that protrudes from the sleeve portion toward the rotation axis. unit. According to the above configuration, the sealing member is in sliding contact with the sleeve portion, so the designer can form a wear-resistant and / or corrosion-resistant seal by using a material having high abrasion resistance and / or corrosion resistance in the sleeve portion. Since the flange portion protrudes from the sleeve portion toward the rotation axis, the flange portion does not increase the outer diameter dimension of the seal. This means that the inner diameter of the casing of the device surrounding the sealing member can be set to a small value. Therefore, it can be better incorporated in a device requiring miniaturization. The seal mechanism according to the above embodiment includes the seal and a shaft member having an outer peripheral surface surrounded by the sleeve portion. The flange portion is housed in a space formed by a recessed portion provided to be recessed from the outer peripheral surface. According to the above configuration, the flange portion protruding from the sleeve portion toward the rotation shaft is housed in a space formed by a concave portion recessed on the outer peripheral surface of the shaft member surrounded by the sleeve portion, so that the designer can prevent the flange portion from facing inward. The space side protrudes, and the outer diameter of the sleeve portion can be reduced. As a result, the device for constructing the seal mechanism can have a smaller length dimension in the extending direction of the rotation axis. In addition, the flange portion is housed in a space formed by the recessed portion, and as a result, the positional relationship between the shaft member and the slinger is approximately fixed. That is, the flange portion may have a positioning function of the slinger with respect to the shaft member. Therefore, the slinger can be attached to the shaft member with high accuracy. Furthermore, instead of forming a recessed portion in the shaft member, the flange portion may be in contact with an end surface (a surface perpendicular to the rotation axis) of the shaft member. With respect to the above configuration, the sealing member may include a main lip pressed against the sleeve portion. The main lip may overlap the flange portion on an imaginary plane orthogonal to the rotation axis. According to the above configuration, since the main lip is pressed against the sleeve portion, it is difficult for a fluid to flow through the boundary between the sleeve portion and the main lip. The main lip overlaps the flange portion on an imaginary plane orthogonal to the rotation axis, so the designer can set the protrusion amount of the end face of the main lip of the flange portion to a very small value. As a result, the device for constructing the seal mechanism can have a smaller length dimension in the extending direction of the rotation shaft.

100‧‧‧seal mechanism

200‧‧‧seals

210‧‧‧sealing member

211‧‧‧Main Ring Department

212‧‧‧Main Lip

213‧‧‧ dust lips

214‧‧‧Spring ring

215‧‧‧Part 1

216‧‧‧Part 2

217‧‧‧Inner periphery

218‧‧‧ Crimp Ring

219‧‧‧link ring

220‧‧‧Spit ring

221‧‧‧ Sleeve

222‧‧‧ flange

223‧‧‧Inner peripheral surface

224‧‧‧outer surface

300‧‧‧ Shaft members

310‧‧‧outer surface

320‧‧‧ annular recess

321‧‧‧Circle 1

322‧‧‧Part 2

323‧‧‧3rd

400‧‧‧shell

410‧‧‧Inner peripheral surface

AHL‧‧‧ Adjacent Layer

PLN‧‧‧imaginary plane

RAX‧‧‧Rotary shaft

W‧‧‧Width

FIG. 1 is a schematic cross-sectional view of an exemplary seal mechanism.

Claims (3)

A seal includes: a seal member surrounding a specific rotation axis; and an oil slinger including a sleeve portion slidingly contacted by the seal member, and a flange portion protruding from the sleeve portion toward the rotation shaft. . A seal mechanism includes: a seal as claimed in claim 1; and a shaft member having an outer peripheral surface surrounded by the sleeve portion; and the flange portion is housed in a manner of being recessed from the outer peripheral surface. The space formed by the recess. The seal mechanism according to claim 2, wherein the seal member includes a main lip pressed against the sleeve portion, and the main lip overlaps the flange portion on an imaginary plane orthogonal to the rotation axis.