KR102430244B1 - Seal body, seal adapter and seal member - Google Patents

Abstract

The present application discloses a seal that prevents the flow of fluid between an external space on the outside of the device and an internal space on the inside of the device. The sealing body includes a sealing member having a sealing portion press-contacted to the surface of the apparatus, and a preventing portion for preventing foreign matter generated in the internal space from entering between the sealing portion and the surface of the apparatus.

Description

SEAL BODY, SEAL ADAPTER AND SEAL MEMBER

FIELD OF THE INVENTION The present invention relates to sealing techniques for preventing the outflow of fluid contained within a device or entry of a fluid into a device.

Seal members are used in various technical fields. For example, the sealing member is used to prevent leakage of oil sealed inside the device. Alternatively, the sealing member is used to prevent the inflow of liquid into the interior of the device (Japanese Utility Model Laid-Open No. 62-100374).

The sealing member of Japanese Utility Model Laid-Open No. 62-100374 has two portions abutting against the outer circumferential surface of the rotating shaft. One of the two parts is the main lip. The other of the two areas is a dust lip. Since the dust lip is outside the main lip and is in contact with the outer peripheral surface of the rotating shaft, foreign matter (eg, dust) floating outside the apparatus hardly reaches the main lip.

While the device is being used, there are cases in which minute foreign matter is generated from parts placed inside the device. For example, iron powder is generated from the tooth surface of a gear disposed inside the device. The dust lip of Japanese Utility Model Publication No. 62-100374 does not contribute to preventing foreign matter generated inside the apparatus from reaching the main lip. Therefore, the foreign material generated inside the apparatus may intrude into the boundary between the main lip and the rotating shaft. In this case, the foreign material may damage the outer peripheral surface of the main lip and/or the rotating shaft. Abrasion of the main lip and/or the outer peripheral surface of the rotating shaft significantly deteriorates the sealing performance of the sealing member.

An object of the present invention is to provide a technique for making it difficult to cause deterioration in sealing performance due to foreign matter generated inside the device.

A sealing body according to an aspect of the present invention prevents flow of a fluid between an external space outside the device and an internal space inside the device. The sealing body includes a sealing member having a sealing portion press-contacted to the surface of the apparatus, and a preventing portion for preventing foreign matter generated in the inner space from entering between the sealing portion and the surface of the apparatus.

A seal adapter according to another aspect of the present invention is disposed between a housing of the device and a shaft inserted into a through hole formed in the housing. This seal adapter is provided with the above-mentioned sealing body, and the installation part provided in the said housing. The installation part includes an inner peripheral surface surrounding the shaft. The shaft has an outer circumferential surface as the surface of the device. The annular space is formed between the outer peripheral surface of the shaft and the inner peripheral surface of the installation part.

A sealing member according to still another aspect of the present invention is disposed in an annular space formed in a device, and prevents flow of a fluid between an external space outside the device and an internal space inside the device. The sealing member includes an annular main lip having a sealing portion press-contacted to the surface of the apparatus, a pressing portion for pressing the main lip to the surface of the apparatus, and dust outside the main lip and pressed against the surface of the apparatus Have a lip The said dust lip is smaller than the said sealing part in an inner diameter.

The above-described sealing technique may make it difficult to cause deterioration in sealing performance due to foreign matter generated inside the device.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing of the sealing body of 1st Embodiment.
Fig. 2 is a schematic cross-sectional view of a seal body according to a second embodiment.
It is a schematic sectional drawing of the sealing body of 3rd Embodiment.
Fig. 4 is a schematic cross-sectional view of a seal adapter according to a fourth embodiment;
5 is a schematic diagram of an installation process for installing a shaft to a seal adapter;
6 is a schematic diagram of an installation process for installing an assembly comprising a shaft and a seal adapter to a housing;
Fig. 7 is a schematic cross-sectional view of a sealing member according to a fifth embodiment.

<First embodiment>

The inventors of the present invention have developed a technique for making it difficult to cause deterioration of the sealing performance due to foreign matter generated inside the device. In the first embodiment, an exemplary seal body capable of maintaining good seal performance over a long period of time is described.

1 : is a schematic sectional drawing of the sealing body 100 of 1st Embodiment. The seal body 100 is described with reference to FIG. 1 .

The seal body 100 shown in FIG. 1 is embedded in the device APT. The device APT includes a shaft SFT and a housing HSG. In the following description, the space enclosed by the housing HSG and the shaft SFT is called "internal space". The space outside the housing HSG is called "external space".

When the housing HSG is fixed, the shaft SFT rotates around the axis of rotation RAX. When the shaft SFT is fixed, the housing HSG rotates around the axis of rotation RAX. The device APT may be a reduction gear or another device. The principles of this embodiment are not limited to the particular instrument used as the device APT.

The seal body 100 is annular as a whole. The shaft SFT is generally cylindrical. The shaft SFT includes an outer peripheral surface OSF against which the seal body 100 abuts. The housing HSG is generally cylindrical in shape. The housing HSG includes a first inner circumferential surface FIS, a second inner circumferential surface SIS, and a face SSF. The first inner circumferential surface FIS surrounds the shaft SFT between the outer space and the inner space, and forms an annular space. The seal body 100 is fitted into the annular space formed between the outer peripheral surface OSF and the first inner peripheral surface FIS. The second inner circumferential surface SIS is inside the first inner circumferential surface FIS in the axial direction of the shaft SFT, and surrounds the shaft SFT. At least a portion of the inner space is formed between the second inner peripheral surface SIS and the outer peripheral surface OSF. The second inner peripheral surface SIS is smaller than the first inner peripheral surface FIS in diameter. Accordingly, the face SSF is formed between the first inner circumferential surface FIS and the second inner circumferential surface SIS. The face SSF is a toroidal plane along an imaginary plane orthogonal to the axis of rotation RAX.

Lubricating oil is accommodated in the interior space. Lubricating oil may be used to lubricate parts (not shown: eg gears) of the device APT disposed in the interior space. The principle of this embodiment is not limited to the specific parts lubricated by the lubricating oil.

The seal body 100 is fitted into the annular space, and separates the inner space from the outer space. As a result, the outflow of lubricating oil from the inner space is obstructed by the seal body 100 . When a liquid (eg, cleaning liquid) is sprayed around the device APT, the seal body 100 prevents the liquid existing in the outer space from flowing into the inner space.

The sealing body 100 includes an annular sealing member 200 and an annular preventing ring 300 . The sealing member 200 and the prevention ring 300 are disposed in an annular space formed between the first inner peripheral surface FIS of the housing HSG and the outer peripheral surface OSF of the shaft SFT. The prevention ring 300 is arranged inside the sealing member 200 in the axial direction of the shaft SFT. That is, the prevention ring 300 faces the interior space. On the other hand, the sealing member 200 faces the external space.

The sealing member 200 includes a main ring portion 210 , an annular main lip 220 , an annular dust lip 230 , and a spring ring 240 . The main ring part 210 has an approximately L-shaped cross section on an imaginary plane including the rotation axis RAX. The main ring part 210 includes a metal ring 211 and a coating layer 212 . The metal ring 211 has a substantially L-shaped cross section on an imaginary plane including the rotation axis RAX. The coating layer 212 covers the metal ring 211 as a whole. The coating layer 212 may be formed of a rubber material, or may be formed of a resin having elasticity.

The coating layer 212 forms a first abutting surface 213 , a second abutting surface 214 , an outer surface 215 , an inner surface 216 , and an inner peripheral surface 217 . The 1st contact surface 213 is connected to the axial direction end in the 2nd contact surface 214, and extends radially from the said end so that it may oppose the prevention ring 300. As shown in FIG. The first abutment surface 213 abuts against the outer peripheral region of the prevention ring 300 , and presses the outer peripheral region of the prevention ring 300 against the face SSF of the housing HSG. Thus, the prevention ring 300 is secured between the seal member 200 and the face SSF.

The second abutting surface 214 is a surface facing the first inner peripheral surface FIS side of the housing HSG, and extends in the axial direction along the first inner peripheral surface FIS. The second abutting surface 214 abuts against the first inner peripheral surface FIS of the housing HSG. The area of the region where the second abutment surface 214 contacts the first inner peripheral surface FIS is larger than the area of the region where the main lip 220 and the dust lip 230 contact the outer peripheral surface OSF of the shaft SFT. Accordingly, the second abutment surface 214 is fixed with respect to the first inner peripheral surface FIS, while the main lip 220 and the dust lip 230 slide on the outer peripheral surface OSF.

The outer surface 215 is a surface facing the opposite side to the first abutting surface 213 and is exposed to the external space. The outer surface 215 is connected to the other end in the axial direction of the second abutting surface 214 (the end opposite to the end to which the first abutting surface 213 is connected), and extends radially from the other end. has been

The inner surface 216 extends from the radially inner end of the first abutting surface 213 toward the outer surface 215, and includes a first area 218 opposite to the outer circumferential surface OSF of the shaft SFT, and a first area ( 218 , extending towards the outer peripheral surface OSF of the shaft SFT, and also includes a second region 219 opposite the prevention ring 300 .

The inner peripheral surface 217 is connected to the inner end of the outer surface 215 in the radial direction and extends inward in the axial direction from the inner end. The inner peripheral surface 217 faces the outer peripheral surface OSF in the radial direction.

The dust lip 230 is formed between the inner peripheral surface 217 and the outer peripheral surface OSF. The dust lip 230 protrudes from the inner peripheral surface 217 of the coating layer 212 in a direction toward the outer peripheral surface OSF of the shaft SFT and in a direction toward the external space. The dust lip 230 is press-contacted to the outer peripheral surface OSF of the shaft SFT, and prevents foreign substances floating in the external space from reaching the main lip 220 . The dust lip 230 may be formed of the same material as the covering layer 212 .

The main lip 220 may be formed of the same material as the covering layer 212 . The main lip 220 is located on the inner side of the dust lip 230 in the axial direction, and includes a press-contact portion 221 and a connection portion 222 . The pressure-contacting portion 221 is connected to the dust lip 230 by the connecting portion 222 and is press-contacted to the outer peripheral surface OSF of the shaft SFT between the dust lip 230 and the prevention ring 300 . The main lip 220 prevents the inflow of the liquid toward the inner space through the dust lip 230 . In addition, the main lip 220 prevents leakage of the lubricant toward the external space through the prevention ring 300 . In this embodiment, the surface area of the main lip 220 is an example of the sealing part press-contacted to the surface of the apparatus APT. The surface of the device is illustrated by the outer peripheral surface OSF of the shaft SFT.

The connection portion 222 protrudes from the inner surface 216 of the main ring portion 210 in the axial direction (ie, toward the prevention ring 300 ), and is connected to the press-contact portion 221 . As described above, since the dust lip 230 prevents the intrusion of foreign substances floating in the external space, the foreign substances are surrounded by the dust lip 230 , the connection part 222 , the pressure contact part 221 , and the outer peripheral surface OSF of the shaft SFT. It hardly goes into space.

The spring ring 240 is formed on the outer peripheral surface of the press-contact portion 221 of the main lip 220 (that is, the surface opposite to the first region 218 of the inner surface 216 of the main ring portion 210 in the radial direction). inserted into the annular groove. When the shaft SFT is fitted into the sealing member 200 , the spring ring 240 is elastically extended. As a result, the force toward the rotation shaft RAX acts on the press-contact portion 221 . The press-contact portion 221 is elastically compressed and deformed. Therefore, a good seal structure is formed at the boundary between the press-contact portion 221 and the outer peripheral surface OSF of the shaft SFT. In this embodiment, the pressing portion is exemplified by the spring ring 240 . Alternatively, the pressing portion may be formed by another member that is elastically stretched in response to the fitting of the shaft SFT. The principle of this embodiment is not limited to the specific parts used for the pressing part.

The prevention ring 300 includes a ring wall 310 and a lip portion 320 . The ring wall 310 includes an inner abutting surface 311 , an outer abutting surface 312 , an outer peripheral surface 313 , and an inner peripheral surface 314 .

The outer peripheral surface 313 is extended in the axial direction and abuts against the first inner peripheral surface FIS of the housing HSG. The inner abutting surface 311 is connected to one end of the outer peripheral surface 313 in the axial direction and extends radially inward from the one end. The inner abutting surface 311 is near the outer circumferential surface 313 and includes an outer circumferential area abutting against the face SSF of the housing HSG and an inner circumferential area facing the inner space.

The outer abutting surface 312 is a surface facing the opposite side to the inner abutting surface 311 in the axial direction. The outer abutting surface 312 is connected to the other end in the axial direction of the outer peripheral surface 313 (the end opposite to the end to which the inner abutting surface 311 is connected), and extends radially inward from the other end. has been The outer abutment surface 312 is axial with respect to an outer peripheral region abutting the first abutment surface 213 of the seal member 200 and the second region 219 of the inner surface 216 of the seal member 200 . and an inner peripheral region opposite to the direction.

The inner peripheral surface 314 is a surface facing the opposite side to the outer peripheral surface 313 in the radial direction. The inner peripheral surface 314 is larger than the shaft SFT in diameter. The inner peripheral surface 314 is diametrically opposed to the outer peripheral surface OSF of the shaft SFT. The lip portion 320 is positioned between the inner peripheral surface 314 and the outer peripheral surface OSF.

The ring wall 310 includes an annular elastic wall 315 and a rigid ring 316 . The elastic wall 315 forms an outer circumferential surface 313 , an inner circumferential surface 314 , and an inner abutting surface 311 . In addition, the resilient wall 315 forms part of the outer abutting surface 312 .

The rigid ring 316 is greater in rigidity than the elastic wall 315 . The elastic wall 315 is formed of a rubber material or a resin material having elasticity, while the rigid ring 316 may be formed of a metal or a hard resin. Since the rigid ring 316 retains the shape of the ring wall 310, the operator can easily place the prevent ring 300 within the device APT. The principle of this embodiment is not limited to the specific material used for the elastic wall 315 and the rigid ring 316 .

The rigid ring 316 is fitted into the recessed groove portion in the area of the elastic wall 315 on the opposite side to the inner circumferential surface 314 . As a result, the rigid ring 316 is fixed to the elastic wall 315 so as to surround the inner circumferential surface 314 .

The lip portion 320 is integrally formed with the elastic wall 315 . The lip portion 320 may be formed of the same material as the elastic wall 315 . The lip portion 320 projects from the inner peripheral surface 314 of the ring wall 310 (the inner periphery of the elastic wall 315) toward the shaft SFT. The lip portion 320 is near the outer peripheral surface OSF of the shaft SFT, is slightly bent toward the inner space, and is press-contacted to the outer peripheral surface OSF. As a result, the pressure contact portion 221 is spaced apart from the inner space by the prevention ring 300 . In this embodiment, the inner periphery is illustrated by the inner peripheral surface 314 of the ring wall 310 .

Figure 1 shows the iron IPD that occurred in the interior space. For example, iron IPD arises from the tooth surface of a gear disposed within the device APT. The principles of this embodiment are not limited to specific sources that cause iron IPD.

The iron powder IPD may try to enter the boundary between the pressure contact part 221 and the outer peripheral surface OSF of shaft SFT as a foreign material. However, as shown in FIG. 1 , since the lip portion 320 blocks the iron IPD, the iron IPD hardly enters the space formed between the prevention ring 300 and the sealing member 200 . Therefore, the risk that the iron powder IPD causes abrasion at the boundary between the pressure contact portion 221 and the outer peripheral surface OSF of the shaft SFT is very small. As a result, the sealing body 100 can exhibit favorable sealing performance over a long period of time. In the present embodiment, the prevention portion is exemplified by the prevention ring 300 .

The lip portion 320 may be pressed against the outer peripheral surface OSF of the shaft SFT with a weaker force than the pressure contact portion 221 . As a result, the frictional force which generate|occur|produces between shaft SFT and the sealing body 100 does not become high unnecessarily. In the present embodiment, the first pressing force is exemplified by the compressive force acting on the pressing portion 221 (that is, the pressing force generated by the spring ring 240 ). The second pressing force is exemplified by the force pressing the lip portion 320 to the outer peripheral surface OSF of the shaft SFT.

<Second embodiment>

The prevention ring described in relation to the first embodiment has a composite structure made of an elastic material and a rigid material. However, the prevention ring may be formed of a single material. In a second embodiment, an exemplary seal body having an anti-ring formed from a single material is described.

2 : is a schematic sectional drawing of 100A of sealing bodies of 2nd Embodiment. With reference to FIG. 2, the seal|sticker body 100A is demonstrated. The description of the above-described embodiment is incorporated by reference to the same reference numerals as those of the above-described embodiment.

As in the first embodiment, the sealing body 100A includes the sealing member 200 . The description of the first embodiment is referred to for the sealing member 200 .

The seal body 100A further includes a prevention ring 300A. The prevention ring 300A is entirely formed of a felt material.

The prevention ring 300A includes an inner abutting surface 311A, an outer abutting surface 312A, an outer peripheral surface 313A, and an inner peripheral surface 314A. The outer peripheral surface 313A abuts against the first inner peripheral surface FIS of the housing HSG while extending in the axial direction. The inner abutting surface 311A is connected to one end of the outer peripheral surface 313A in the axial direction and extends radially inward from the one end. The inner abutting surface 311A is near the outer peripheral surface 313A, and includes an outer peripheral region that abuts against the face SSF of the housing HSG, and an inner peripheral region that faces the inner space.

The outer abutting surface 312A is a surface facing the opposite side to the inner abutting surface 311A in the axial direction. The outer abutting surface 312A is connected to the other end in the axial direction of the outer peripheral surface 313A (the end opposite to the end to which the inner abutting surface 311A is connected), and extends radially inward from the other end. has been The outer abutment surface 312A is axial with respect to an outer peripheral region abutting the first abutment surface 213 of the seal member 200 and the second region 219 of the inner surface 216 of the seal member 200 . and an inner peripheral region opposite to the direction.

The inner peripheral surface 314A is a surface facing the opposite side to the outer peripheral surface 313A in the radial direction. The inner circumferential surface 314A extends along the axial direction and abuts against the outer circumferential surface OSF of the shaft SFT. Accordingly, the sealing member 200 is spaced apart from the interior space by the prevention ring 300A.

As shown in Fig. 2, the iron IPD floating in the inner space is captured on the inner abutting surface 311A of the prevention ring 300A. Accordingly, the iron powder IPD hardly enters the gap between the prevention ring 300A and the sealing member 200 . Since the risk that iron powder IPD causes abrasion at the boundary between the pressure-contacting part 221 and the outer peripheral surface OSF of shaft SFT is very small, 100 A of sealing bodies can exhibit favorable sealing performance over a long period of time.

<Third embodiment>

Regarding the above-described embodiment, the preventing portion for blocking foreign matter generated inside the device is formed as a member different from the sealing member. Alternatively, the preventing portion may be formed integrally with the sealing member. In this case, an operator can easily install a sealing body to an apparatus. In a third embodiment, an exemplary sealing body having a sealing member and an integral preventing portion is described.

3 : is a schematic sectional drawing of the sealing body 100B of 3rd Embodiment. 1 and 3, the seal body 100B is described. The description of the above-described embodiment is incorporated by reference to the same reference numerals as those of the above-described embodiment.

The sealing body 100B is provided with the annular sealing member 200B and the lip part 320B. The lip portion 320B, like the lip portion 320 described with reference to FIG. 1 , is used to prevent iron IPD. Unlike the above-described embodiment, the lip portion 320B is integral with the sealing member 200B. In this embodiment, the prevention part is illustrated by the lip part 320B.

As in the first embodiment, the sealing member 200B includes a main ring portion 210 , a dust lip 230 , and a spring ring 240 . The description of the first embodiment is referred to for these elements.

The sealing member 200B further includes an annular main lip 220B. Similar to the first embodiment, the main lip 220B includes a connecting portion 222 . The description of the first embodiment is incorporated into the connection part 222 .

The main lip 220B further includes a press-contact portion 221B. The press-contact portion 221B is press-contacted to the outer peripheral surface OSF of the shaft SFT between the dust lip 230 and the lip portion 320B by the spring ring 240 . The main lip 220B prevents the inflow of liquid toward the inner space through the dust lip 230 . In addition, the main lip 220B prevents leakage of the lubricant toward the external space through the lip portion 320B. In this embodiment, the surface area of the main lip 220B is an example of the sealing part press-contacted to the surface of the apparatus APT.

The lip portion 320B is integrally formed with the press-contact portion 221B. The lip portion 320B protrudes from the press-contact portion 221B toward the inner space and the outer peripheral surface OSF of the shaft SFT, and is pressed against the outer peripheral surface OSF of the shaft SFT.

The pressure contact portion 221B is surrounded by the spring ring 240 , while the lip portion 320B is not surrounded by the spring ring 240 . Accordingly, the pressing force generated by the elastic deformation of the spring ring 240 strongly acts on the press-contact portion 221B, while it acts weakly on the lip portion 320B. As a result, the frictional force between the sealing body 100B and the outer peripheral surface OSF of shaft SFT is not made high unnecessarily.

The surface area of the press-contact portion 221B, which is press-contacted to the outer peripheral surface OSF of the shaft SFT, is spaced apart from the inner space and the outer space by the lip portion 320B and the dust lip 230 . Accordingly, the iron IPD floating in the inner region or the foreign material floating in the external space hardly causes abrasion at the boundary between the pressure contact portion 221 and the shaft SFT.

<Fourth embodiment>

Since the dust lip is exposed to the external space, the operator can visually recognize whether the dust lip built into the device is bent or not. However, since the lip part for blocking the foreign material which generate|occur|produced in the internal space is exposed to the internal space, an operator cannot visually recognize whether a sealing body has a lip part bent. When the lip portion is bent and bent in the device, foreign matter floating in the internal space reaches the main lip, and may cause abrasion at the boundary between the shaft and the main lip. In the fourth embodiment, an exemplary technique for reducing the risk that the lip portion is bent and bent in the apparatus is described.

4 is a schematic cross-sectional view of a seal adapter 400 of the fourth embodiment. 1 , 3 and 4 , a seal adapter 400 is described. The description of the above-described embodiment is incorporated by reference to the same reference numerals as those of the above-described embodiment.

The seal adapter 400 includes a seal body 100C, a bearing 410 , a fixed ring 420 , and an adapter tube 430 . The sealing body 100C demonstrated with reference to FIG. 1 may be sufficient as 100 C of sealing bodies. Alternatively, the seal body 100C may be the seal body 100B described with reference to FIG. 3 . The description regarding the sealing bodies 100 and 100B is referred to 100C of sealing bodies.

The adapter cylinder 430 includes an annular flange 431 and a holding cylinder 432 . The flange 431 has an inner surface 441, an outer surface 442 facing the opposite side to the inner surface 441, an inner peripheral surface 443 connecting the inner end of the inner surface 441 and the inner end of the outer surface 442, and an inner surface ( It includes an outer peripheral surface 444 facing the opposite side to 443 , and a shoulder surface 445 extending radially inward from the inner peripheral surface 443 . The inner surface 441 abuts against the surface of the housing (not shown). The outer surface 442 on the opposite side to the inner surface 441 is exposed to the external space. A plurality of insertion holes 446 extending from the outer surface 442 to the inner surface 441 are formed in the flange 431 . The plurality of screws are respectively inserted into the plurality of insertion holes 446, and are screwed into the screw holes formed in the housing. As a result, the flange 431 is fixed to the housing. In this embodiment, the installation part is illustrated by the flange 431 .

The outer circumferential surface 444 surrounds the inner circumferential surface 443 . The axial length of the outer circumferential surface 444 approximately corresponds to the depth of a circular recess (not shown) formed in the housing. The diameter of the outer circumferential surface 444 approximately matches the diameter of the circular recess formed in the housing.

The inner peripheral surface 443 on the opposite side of the outer peripheral surface 444 forms a space into which a shaft (not shown) is inserted. The diameter of the inner peripheral surface 443 is larger than the diameter of the shaft. Accordingly, the inner circumferential surface 443 surrounds the shaft, and an annular space is formed between the inner circumferential surface 443 and the outer circumferential surface (not shown) of the shaft. The sealing body 100C is fitted into the annular space.

The diameter of the inner peripheral surface 443 is larger than the inner diameter of the holding cylinder 432 . Accordingly, the face surface 445 is formed between the inner peripheral surface 443 and the holding cylinder 432 . The face surface 445 is a toroidal surface formed along an imaginary plane orthogonal to the rotation axis RAX. The operator press-fits the sealing body 100C into the space formed by the inner circumferential surface 443 , and may press the shoulder surface 445 .

The holding cylinder 432 extends from the face surface 445 into the interior space. The holding cylinder 432 includes a main portion 451 and a tip portion 452 . The tip portion 452 is smaller than the main portion 451 in inner diameter. Accordingly, the tip portion 452 protrudes from the main portion 451 toward the rotation axis RAX. The operator presses the bearing 410 into the holding cylinder 432 and abuts against the tip portion 452 .

The main part 451 includes an inner peripheral surface 453 in contact with the outer race of the bearing 410 . An annular groove surrounding the rotation shaft RAX is formed on the inner peripheral surface 453 . After fitting the bearing 410 into the holding cylinder 432 , the operator fits the fixed ring 420 into the annular groove formed on the inner circumferential surface 453 . Since the fixed ring 420 and the distal end 452 sandwich the bearing 410, the bearing 410 is not displaced in the extension installation direction of the rotating shaft RAX. After the operator installs the fixed ring 420 in the holding cylinder 432 , the sealing body 100C is fitted into the flange 431 . As a result, the seal adapter 400 is completed.

5 is a schematic diagram of an installation process for installing the shaft SFT to the seal adapter 400 . 1, 3 and 5, the installation process is described.

The shaft SFT is inserted into the seal adapter 400 in a direction from the outer space to the inner space (ie, from the outer surface 442 to the inner surface 441 of the flange 431 ). The outer peripheral surface OSF of the shaft SFT abuts against the inner peripheral surface of the bearing 410 , and is held by the bearing 410 . Thus, the shaft SFT can rotate about the axis of rotation RAX.

1 and 3 , since the lip portions 320 and 320B protrude toward the interior space, the projection direction of the lip portions 320 and 320B coincides with the insertion direction of the shaft SFT. During insertion of the shaft SFT, the lip portions 320 and 320B can maintain a protruding posture toward the bearing 410 , so that the lip portions 320 and 320B are difficult to bend.

The shaft SFT includes a gear shaft GSF and a shaft barrel STT. The proximal end of the gear shaft GSF is fitted into the shaft tube STT. A gear part GPT is formed at the front end of the gear shaft GSF. The gear portion GPT meshes with another gear disposed within the device (not shown). The iron powder IPD described with reference to FIGS. 1 and 3 may occur due to meshing between the gear portion GPT and other gears.

The shaft tube STT includes a first tube portion FTB and a second tube portion STB. The second cylinder STB extends from the first cylinder FTB toward the interior space. 1st cylinder part FTB is larger than 2nd cylinder part STB in an outer diameter. Accordingly, the face SLD is formed at the boundary between the first tube FTB and the second tube STB. The operator inserts the shaft SFT into the seal adapter 400 until the face SLD abuts the bearing 410 . As a result, 100 C of sealing bodies are accommodated in the annular space formed between the outer peripheral surface OSF of 1st cylindrical part FTB, and the inner peripheral surface 443 of the flange 431. As shown in FIG. The tips of the lip portions 320 and 320B described with reference to FIGS. 1 and 3 are press-contacted to the outer peripheral surface OSF of the first cylindrical portion FTB. At this time, the bearing 410 is accommodated in the annular space formed between the inner peripheral surface 453 of the holding cylinder 432 and the outer peripheral surface OSF of the second cylindrical portion STB. In this embodiment, the surface of the device is illustrated by the outer peripheral surface OSF of the shaft tube STT.

As shown in the left figure of FIG. 5, the annular groove AGV is formed in the outer peripheral surface OSF of 2nd cylindrical part STB. When the face SLD abuts against the bearing 410 , the annular groove AGV appears in a circular space surrounded by the tip 452 of the holding cylinder 432 . 5, the operator inserts the fixed ring SPR into the annular groove AGV. As a result, the inner race of the bearing 410 is fitted by the face SLD and the fixed ring SPR. On the other hand, the outer race of the bearing 410 is fitted by the tip portion 452 of the holding cylinder 432 and the fixed ring 420 . Therefore, the bearing 410 is fixed in the holding cylinder 432 in the extended installation direction of the rotating shaft RAX.

6 is a schematic diagram of an installation process for installing an assembly comprising a shaft SFT and a seal adapter 400 to a housing HSH. 1, 3 to 6, the installation process will be described.

The housing HSH includes an outer end face OES, a concave face RCS stepped with respect to the outer end face OES, and a holding wall SWS extending axially from an inner end of the concave face RCS. The outer end face OES is exposed to the outer space. The concave face RCS is recessed into the outer end face OES around the axis of rotation RAX. The flange 431 is received in a concave space surrounded by the concave surface RCS. The plurality of screws SCW are respectively inserted through the plurality of insertion holes 446 (refer to Fig. 4), and are screwed into the screw holes formed in the concave surface RCS. As a result, the flange 431 is fixed to the housing HSH.

The holding wall SWS forms a through hole which forms part of the interior space. The shaft SFT passes through the through hole. The holding cylinder 432 is inserted into the through hole formed by the holding wall SWS. The holding cylinder 432 is supported by the holding wall SWS.

According to the principle of this embodiment, the operator creates an assembly comprising the shaft SFT and the seal adapter 400, and then embeds the assembly in the housing HSH. As described with reference to Fig. 5, when the assembly is made, the lip portions 320 and 320B (refer to Figs. 1 and 3) are difficult to bend and bend. Upon embedding of the assembly into the housing HSH, the adapter tube 430 exists between the seal body 100C and the housing HSH, so that the seal body 100C does not interfere with the housing HSH. Accordingly, the lip portions 320 and 320B can maintain a state in which they are pressed against the outer peripheral surface OSF of the shaft SFT without being bent. Since the lip parts 320 and 320B can effectively prevent iron IPD (refer to FIGS. 1 and 3) generated from the gear part GPT or other sliding contact parts, the risk that the iron IPD impairs the sealing function of the seal body 100C is is significantly reduced.

<Fifth embodiment>

Grease is applied to reduce friction between the dust lip and the shaft. As described in relation to the first embodiment, since the dust lip is disposed in the vicinity of the main lip, a grease layer may also be formed at the boundary between the main lip and the shaft. In this case, the lubricating oil contained in the housing may contact the grease layer at the boundary between the main lip and the shaft in order to reduce the frictional force between the gears. Depending on the combination of the lubricant and grease components, the contact of the lubricant with the grease layer sometimes results in the formation of sludge at the interface between the main lip and the shaft. The sludge may act as a foreign material and cause abrasion of the main lip. In the fifth embodiment, an exemplary technique for reducing the risk of generation of sludge is described.

7 : is a schematic sectional drawing of the sealing member 200D of 5th Embodiment. Referring to Fig. 7, the sealing member 200D is described. The description of the above-described embodiment is incorporated by reference to the same reference numerals as those of the above-described embodiment.

As in the first embodiment, the sealing member 200D includes a main ring portion 210 , a main lip 220 , and a spring ring 240 . The description of the first embodiment is referred to for these elements.

7 shows a device APU. Like the first embodiment, the device APU comprises a housing HSG. The description of the first embodiment is incorporated into the housing HSG.

The device APU further comprises a shaft SFU. The shaft SFU is surrounded by the housing HSG. The sealing member 200D is fitted into the annular space formed between the housing HSG and the shaft SFU, and prevents the flow of fluid between the outer space and the inner space.

The shaft SFU connects the first outer circumferential surface FOS, the second outer circumferential surface SOS located outside the first outer circumferential surface FOS in the axial direction, and the first outer circumferential surface FOS and the second outer circumferential surface SOS, and extends the shaft SFU toward the outside in the axial direction. It includes a tapered perimeter TPC that is slanted to reduce it. At least a portion of the inner space is formed between the housing HSG and the first outer circumferential surface FOS. The main lip 220 is pressed against the first outer peripheral surface FOS by the spring ring 240 . In this embodiment, the pressing portion is exemplified by the spring ring 240 .

The second outer circumferential surface SOS is partially exposed to the external space. The second outer circumferential surface SOS is smaller than the first outer circumferential surface FOS in diameter. The tapered peripheral surface TPC forms the peripheral surface of the truncated cone which narrows from the first peripheral surface FOS toward the second peripheral surface SOS.

The sealing member 200D further includes a dust lip 230D extending from the inner circumferential surface 217 of the main ring portion 210 toward the second outer circumferential surface SOS. The dust lip 230D includes a distal end 231 abutting against the second outer circumferential surface SOS. That is, the tip portion 231 is press-contacted to the surface of the shaft SFU from the outside of the main lip 220 .

The inner diameter of the dust lip 230D defined by the tip portion 231 is smaller than the inner diameter of the main lip 220 . As described above, since the second outer circumferential surface SOS has a smaller diameter than the first outer circumferential surface FOS, the tip portion 231 is not excessively strongly pressed against the second outer circumferential surface SOS. In the present embodiment, the surface of the device is exemplified by the first outer circumferential surface FOS and the second outer circumferential surface SOS.

The operator may apply grease to the second outer circumferential surface SOS to reduce friction between the tip portion 231 and the second outer circumferential surface SOS. The tapered peripheral surface TPC between the first peripheral surface FOS and the second peripheral surface SOS prevents the grease applied to the second peripheral surface SOS from being replaced by the first peripheral surface FOS. Therefore, it is difficult for the grease to contact the lubricating oil accommodated in the internal space. This means that the risk of generation of sludge between the main lip 220 and the first outer peripheral surface FOS is reduced. As a result, the risk of abrasion of the main lip 220 and the 1st outer peripheral surface FOS is also reduced.

The design principles described in connection with the various embodiments described above are applicable to various seal structures. Some of the various features described in relation to one of the various embodiments described above may be applied to the sealing technology described in relation to another yet another embodiment.

In addition, the outline|summary of embodiment mentioned above is as follows.

The sealing body which concerns on the above-mentioned embodiment prevents the flow of a fluid between the outer space of the outer side of an apparatus, and the inner space of the inner side of the said apparatus. The sealing body includes a sealing member having a sealing portion press-contacted to the surface of the apparatus, and a preventing portion for preventing foreign matter generated in the inner space from entering between the sealing portion and the surface of the apparatus.

According to the above configuration, since the sealing body is provided with a preventing portion for preventing foreign substances generated in the internal space from entering the sealing portion, deterioration of the sealing performance due to the foreign substances generated inside the apparatus is unlikely to occur.

With respect to the above configuration, the preventing portion may include a lip portion press-contacted to the surface of the device. The lip portion isolates the seal portion from the interior space.

According to the above configuration, since the lip portion press-contacted to the surface of the apparatus isolates the seal portion from the internal space, foreign substances generated in the inner space of the apparatus hardly reach the seal portion. Therefore, the deterioration of the sealing performance due to the foreign material generated inside the device is unlikely to occur.

With respect to the above configuration, the seal portion may be pressed against the surface of the device by a first pressure contact force. The lip portion may be pressed by a second pressing force smaller than the first pressing force.

According to the above configuration, since the lip portion is pressed by the second pressing force smaller than the first pressing force, the frictional force between the sealing body and the surface of the device does not become excessively large. Thus, the seal body does not create an excessively large drag force that resists operation of the device.

With respect to the above configuration, the preventing portion may be an preventing ring disposed in an annular space formed in the device. The prevention ring may include an annular elastic wall having an inner periphery from which the lip portion protrudes, and a rigid ring fixed to the elastic wall so as to surround the inner periphery and having a higher rigidity than the elastic wall.

According to the above configuration, since the rigid ring having higher rigidity than the elastic wall is fixed to the elastic wall so as to surround the inner periphery of the elastic wall, when the operator places the prevention ring in the annular space formed in the device, the elastic wall is not deformed difficult. Accordingly, the operator can easily install the seal to the apparatus. Since the lip portion integrally formed with the elastic wall protrudes from the inner periphery of the elastic wall, when the operator places the prevention ring in the annular space formed in the apparatus, the lip portion is press-contacted to the surface of the apparatus. As a result, it becomes difficult for the foreign material which generate|occur|produced in the internal space of an apparatus to reach a sealing part. Therefore, the deterioration of the sealing performance due to the foreign material generated inside the device is unlikely to occur.

With regard to the above configuration, the preventing portion may be integral with the sealing member.

According to the said structure, since the prevention part is integral with the sealing member, an operator can install a sealing body to an apparatus easily.

With respect to the above configuration, the sealing member may include the sealing portion, an annular pressure-contacting portion disposed in the annular space formed in the apparatus, and a pressing portion pressing the pressure-contacting portion to the surface of the apparatus. The lip portion may be integral with the press-contact portion and protrude from the press-contact portion into the inner space.

According to the above configuration, since the annular press-contact portion disposed in the annular space formed in the apparatus is pressed against the surface of the apparatus by the pressing portion, the sealing body can have a good sealing function. Since the lip portion is integral with the press-contact portion, the operator can easily install the seal body to the apparatus. Since the lip protrudes from the press-contact portion into the inner space and abuts against the surface of the device, the lip portion may prevent foreign matter generated in the device from reaching the press-contact portion. Therefore, it is difficult to generate|occur|produce the fall of the sealing performance resulting from the foreign material which generate|occur|produced inside the apparatus.

The seal adapter according to the above-described embodiment is a seal adapter disposed between a housing of the device and a shaft inserted into a through hole formed in the housing, and includes the above-described seal body and an installation portion provided in the housing. The installation part includes an inner peripheral surface surrounding the shaft. The shaft has an outer circumferential surface as the surface of the device. The annular space is formed between the outer peripheral surface of the shaft and the inner peripheral surface of the installation part.

According to the above configuration, since the annular space in which the seal body is disposed is formed between the outer circumferential surface of the shaft and the inner circumferential surface of the mounting part, when the operator installs the mounting part in the housing of the apparatus and places the shaft in the housing, the housing and the outer peripheral surface of the shaft The formed inner space is spaced apart from the outer space outside of the device by the seal body. Since the sealing body has a preventive part, the foreign material which generate|occur|produced in the internal space does not reach the sealing part of a sealing member. Therefore, the sealing performance of a sealing part is maintained over a long period of time.

With respect to the above configuration, the seal adapter may further include a holding tube extending from the mounting portion to the inner space, and a bearing fitted between the holding tube and the outer peripheral surface of the shaft. The lip portion may protrude from the elastic wall or the press-contact portion toward the bearing, and may be press-contacted to the outer peripheral surface of the shaft.

According to the above configuration, the bearing is fitted between the outer circumferential surface of the shaft and the holding cylinder extending from the mounting portion to the inner space, so that the shaft can rotate within the housing. Alternatively, the housing may rotate about the shaft. The lip portion protrudes toward the bearing from the elastic wall or the press-contact portion and is press-contacted to the outer circumferential surface of the shaft, so that when the operator fits the shaft into the bearing through the seal body, the insertion direction of the shaft coincides with the projection direction of the lip portion. Accordingly, the lip portion is hardly bent and bent on the outer circumferential surface of the shaft.

The sealing member according to the above-described embodiment is disposed in the annular space formed in the device, and prevents the flow of fluid between the external space outside the device and the internal space inside the device. The sealing member includes an annular main lip having a sealing portion press-contacted to the surface of the apparatus, a pressing portion for pressing the main lip to the surface of the apparatus, and dust outside the main lip and pressed against the surface of the apparatus Have a lip The said dust lip is smaller than the said sealing part in an inner diameter.

Regarding the above configuration, since the dust lip is smaller than the seal portion in the inner diameter, the designer can design the surface of the device so that a step is formed between the portion where the dust lip abuts and the portion where the main lip abuts. Therefore, since the grease applied to the boundary between the dust lip and the surface of the device is spaced apart from the part where the main lip comes into contact with the step difference, the risk of sludge generated due to the contact between the grease and the lubricant contained in the internal space of the device is significantly reduced. Since the sludge is hardly interposed at the boundary between the seal portion and the surface of the apparatus, the deterioration of the sealing performance due to the sludge generated inside the apparatus is unlikely to occur.

Claims (11)

a seal body for preventing flow of a fluid between an external space outside the device and an internal space inside the device;
and an installation part installed in the housing of the device;
The sealing body includes a sealing member having a sealing portion press-contacted to the surface of the device, and a preventing portion for preventing foreign matter generated in the internal space from entering between the sealing portion and the surface of the device,
the prevention portion comprises a lip portion press-contacted to the surface of the device;
The lip portion isolates the seal portion from the interior space,
the prevention portion is an prevention ring disposed within an annular space formed within the device;
The prevention ring includes an annular elastic wall having an inner periphery from which the lip portion protrudes, and a rigid ring fixed to the elastic wall so as to surround the inner periphery, and having a higher rigidity than the elastic wall,
The installation part includes an inner peripheral surface surrounding the shaft,
the shaft has an outer circumferential surface as the surface of the device;
The annular space is formed between the outer circumferential surface of the shaft and the inner circumferential surface of the installation portion. a seal body for preventing flow of a fluid between an external space outside the device and an internal space inside the device;
and an installation part installed in the housing of the device;
The sealing body includes a sealing member having a sealing portion press-contacted to the surface of the device, and a preventing portion for preventing foreign matter generated in the internal space from entering between the sealing portion and the surface of the device,
the prevention portion comprises a lip portion press-contacted to the surface of the device;
The lip portion isolates the seal portion from the interior space,
The sealing member has the sealing portion and further includes an annular pressure-contacting portion disposed in an annular space formed in the device, and a pressing portion pressing the pressure-contacting portion to the surface of the device;
The lip portion is integral with the press-contact portion and protrudes from the press-contact portion into the inner space,
The installation part includes an inner peripheral surface surrounding the shaft,
the shaft has an outer circumferential surface as the surface of the device;
The annular space is formed between the outer circumferential surface of the shaft and the inner circumferential surface of the installation portion. The holding passage according to claim 1, further comprising: a holding passage extending from the installation part to the interior space;
Further comprising a bearing fitted between the holding tube and the outer peripheral surface of the shaft,
and the lip portion protrudes from the resilient wall toward the bearing and is press-contacted to the outer circumferential surface of the shaft. The holding passage according to claim 2, wherein the holding passage extends from the installation part to the inner space;
Further comprising a bearing fitted between the holding tube and the outer peripheral surface of the shaft,
and the lip portion protrudes from the press-contact portion toward the bearing and is press-contacted to the outer circumferential surface of the shaft. A sealing member disposed in an annular space formed in the device and preventing flow of a fluid between an external space outside the device and an internal space inside the device,
The device has a shaft extending outwardly from the inner space of the device, and a housing surrounding the radially outer side of the shaft with the annular space therebetween;
The shaft includes a first portion having a first outer circumferential surface, and a second portion located outside the first outer circumferential surface in an axial direction and having a smaller diameter than the first portion and having a second outer circumferential surface,
an annular main lip having a seal portion press-contacted to the first outer circumferential surface of the shaft;
a pressing part for pressing the main lip against the first outer peripheral surface of the shaft;
a dust lip pressed against the second outer circumferential surface of the shaft;
The inner diameter of the said dust lip crimped|bonded to the said 2nd outer peripheral surface is smaller than the inner diameter of the said sealing part press-contacted to the said 1st outer peripheral surface, The sealing member. delete delete delete delete delete delete

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