TWI732026B - Sealing adapter and sealing component - Google Patents

Abstract

The application of the present invention discloses a sealing body that prevents fluid from flowing between the external space on the outside of the device and the internal space on the inside of the device. The sealing body is provided with a sealing member having a sealing part crimped to the surface of the device, and a preventing part which prevents foreign matter generated in the internal space from entering between the sealing part and the surface of the device.

Description

Sealing adapter and sealing component

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

Sealing members are used in various technical fields. For example, a sealing member is used to prevent leakage of oil enclosed in the device. Alternatively, a sealing member (Japanese Patent Application Publication No. 62-100374) is used in order to prevent the inflow of liquid into the inside of the device.

The sealing member of Japanese Unexamined Patent Application Publication No. 62-100374 has two locations that abut on the outer peripheral surface of the rotating shaft. One of the two parts is the main lip. The other of the 2 parts is a dust lip. Since the dust-proof lip is more outside than the main lip and abuts on the outer peripheral surface of the rotating shaft, foreign matter (for example, dust) suspended on the outer side of the device cannot easily reach the main lip.

During the use of the device, there are situations where fine foreign matter is generated from the parts arranged inside the device. For example, iron powder is generated from the tooth surface of a gear arranged inside the device. The dust-proof lip of Japanese Unexamined Publication No. 62-100374 cannot prevent foreign matter generated inside the device from reaching the main lip. Therefore, there are cases where foreign matter generated inside the device invades the boundary between the main lip and the rotating shaft. In this case, foreign objects may damage the outer peripheral surface of the main lip and/or the rotating shaft. The rubbing of the main lip and/or the outer peripheral surface of the rotating shaft significantly reduces the sealing performance of the sealing member.

The object of the present invention is to provide a technology that is unlikely to cause the deterioration of the sealing performance due to the foreign matter generated inside the device.

The sealing body of one aspect of the present invention prevents the flow of fluid between the external space on the outside of the device and the internal space on the inside of the aforementioned device. The sealing body includes: a sealing member having a sealing part crimped to the surface of the device; and a preventing part that prevents foreign matter generated in the internal space from entering between the sealing part and the surface of the device.

Another aspect of the sealing adapter of the present invention is arranged between the housing of the aforementioned device and the shaft inserted into the through hole formed in the aforementioned housing. The sealed adapter includes the above-mentioned sealing body and a mounting part mounted on the above-mentioned housing. The mounting portion includes an inner peripheral surface surrounding the shaft. The shaft has an outer peripheral 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 mounting portion.

Another aspect of the present invention is that the sealing member is arranged in the annular space formed in the device to prevent fluid from flowing between the external space outside the device and the internal space inside the device. The sealing member is provided with: a ring-shaped main lip having a sealing portion that is crimped on the surface of the device; a pressing portion that presses the main lip against the surface of the device; and a dust-proof lip, which is more compact than the main lip. The outside is pressed against the aforementioned surface of the aforementioned device. The inner diameter of the dust-proof lip is smaller than the sealing portion.

The above-mentioned sealing technology is not easy to cause the deterioration of the sealing performance caused by the foreign matter generated inside the device.

100: Seal body

100A: Sealed body

100B: Sealed body

100C: Sealed body

200: Sealing member

200B: Sealing member

200D: Sealing member

210: Main Ring

211: Metal ring

212: Coating layer

213: The first abutment surface

214: 2nd abutment surface

215: Outer surface

216: Inside

217: Inner Circumference

218: Zone 1

219: Zone 2

220: main lip

220B: main lip

221: crimping part

221B: Crimp section

222: Connection

230: Dust Lip

230D: Dust lip

231: Front end

240: spring ring

300: Prevent ring

300A: Prevent ring

310: Ring Wall

311: Inner Abutment Surface

311A: Inner abutment surface

312: Outer abutment surface

312A: Outer abutment surface

313: Outer peripheral surface

313A: Outer peripheral surface

314: inner peripheral surface

314A: inner peripheral surface

315: Elastic Wall

316: rigid ring

320: Lips

320B: Lips

400: Sealed adapter

410: Bearing

420: retaining ring

430: Adapter Barrel

431: Flange

432: keep the tube

441: Inside

442: outer surface

443: inner circumference

444: Outer peripheral surface

445: Shoulder

446: Through Hole

451: main part

452: Front end

453: Inner Circumference

AGV: ring groove

APT: device

APU: device

FIS: 1st inner peripheral surface

FTB: 1st tube

FOS: 1st outer peripheral surface

GPT: Gear Department

GSF: gear shaft

HSG: shell

HSH: shell

IPD: iron powder

OES: Outer end face

OSF: outer peripheral surface

RAX: Rotation axis

RCS: concave

SCW: Screw

SFT: Shaft

SFU: shaft

SIS: 2nd inner peripheral surface

SLD: Shoulder

SOS: 2nd outer peripheral surface

SPR: retaining ring

SSF: Shoulder

STB: 2nd barrel

STT: Shaft tube

SWS: Keep the wall

TPC: tapered peripheral surface

Fig. 1 is a schematic cross-sectional view of the sealing body of the first embodiment.

Fig. 2 is a schematic cross-sectional view of the sealing body of the second embodiment.

Fig. 3 is a schematic cross-sectional view of the sealing body of the third embodiment.

Fig. 4 is a schematic cross-sectional view of the sealed adapter of the fourth embodiment.

Figure 5 is a schematic diagram of the installation steps for installing the shaft on the seal adapter.

Fig. 6 is a schematic diagram of the installation steps of installing the assembly including the shaft and the sealing adapter to the housing.

Fig. 7 is a schematic cross-sectional view of a sealing member of a fifth embodiment.

<First Embodiment>

The inventors of the present invention have developed a technology that is unlikely to cause deterioration of sealing performance due to foreign matter generated inside the device. In the first embodiment, an exemplary sealing body that can maintain good sealing performance for a long period of time will be described.

Fig. 1 is a schematic cross-sectional view of a sealing body 100 according to the first embodiment. The sealing body 100 will be described with reference to FIG. 1.

The sealing body 100 shown in FIG. 1 is assembled into 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 referred to as "internal space". The space outside the housing HSG is called "external space".

If the housing HSG is fixed, the shaft SFT rotates around the rotation axis RAX. If the axis SFT is fixed, the housing HSG rotates around the rotation axis RAX. The device APT can be a reducer or other device. The principle of this embodiment is not limited to a specific mechanism used as the device APT.

The sealing body 100 is annular as a whole. The shaft SFT is cylindrical as a whole. The shaft SFT includes the outer peripheral surface OSF that the sealing body 100 abuts. The housing HSG has a cylindrical shape as a whole. The housing HSG includes: a first inner peripheral surface FIS, a second inner peripheral surface SIS, and a shoulder surface SSF. The first inner peripheral surface FIS surrounds the shaft SFT between the outer space and the inner space, forming an annular space. The sealing body 100 is fitted in an annular space formed between the outer peripheral surface OSF and the first inner peripheral surface FIS. The second inner circumferential surface SIS is located further inward in the axial direction of the shaft SFT than the first inner circumferential surface FIS, and surrounds the shaft SFT. At least a part of the internal space is formed between the second inner peripheral surface SIS and the outer peripheral surface OSF. The second inner peripheral surface SIS is small in diameter On the first inner peripheral surface FIS. Therefore, the shoulder surface SSF is formed between the first inner peripheral surface FIS and the second inner peripheral surface SIS. The shoulder surface SSF is an annular surface along an imaginary plane orthogonal to the rotation axis RAX.

The lubricating oil is contained in the internal space. Lubricating oil can be used for lubricating parts (not shown: gears, for example) of the device APT arranged in the internal space. The principle of this embodiment is not limited to specific parts lubricated by lubricating oil.

The sealing body 100 is embedded in the annular space, and the internal space is separated from the external space. As a result, the sealing body 100 prevents the lubricating oil from flowing out of the internal space. If liquid (for example, cleaning liquid) is spread around the device APT, the sealing body 100 prevents the liquid existing in the external space from flowing into the internal space.

The sealing body 100 includes a ring-shaped sealing member 200 and a ring-shaped prevention ring 300. The sealing member 200 and the prevention ring 300 are arranged 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 on the inner side of the sealing member 200 in the axial direction of the shaft SFT. That is, the prevention ring 300 faces the inner 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 portion 210 has a substantially L-shaped cross section on a virtual plane including the rotation axis RAX. The main ring portion 210 includes a metal ring 211 and a coating layer 212. The metal ring 211 has a substantially L-shaped cross section on a virtual plane including the rotation axis RAX. The covering layer 212 entirely covers the metal ring 211. The covering layer 212 may be formed of a rubber material, or may be formed of a resin having elasticity.

The coating layer 212 is formed with a first contact surface 213, a second contact surface 214, an outer surface 215, an inner surface 216, and an inner peripheral surface 217. The first abutting surface 213 is connected to one end of the second abutting surface 214 in the axial direction, and extends from the one end in the radial direction so as to oppose the prevention ring 300. The first abutment surface 213 abuts In the outer circumferential area of the prevention ring 300, the outer circumferential area of the prevention ring 300 is pressed against the shoulder surface SSF of the housing HSG. Therefore, the prevention ring 300 is fixed between the sealing member 200 and the shoulder surface SSF.

The second contact 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 area where the second abutting surface 214 contacts the first inner peripheral surface FIS is larger than the area of the area where the main lip 220 and the dust lip 230 contact the outer peripheral surface OSF of the shaft SFT. Therefore, the second contact surface 214 is fixed with respect to the first inner peripheral surface FIS, while on the other hand, the main lip 220 and the dust-proof lip 230 slide on the outer peripheral surface OSF.

The outer surface 215 faces the surface opposite to the first contact 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 on the opposite side to the end connected to the first abutting surface 213), and extends from the other end in the radial direction.

The inner surface 216 includes: a first area 218, which expands from the radially inner end of the first abutting surface 213 toward the outer surface 215, and is opposed to the outer peripheral surface OSF of the shaft SFT; and a second area 219, which extends from the first abutting surface 213 The 1 area 218 expands toward the outer peripheral surface OSF of the shaft SFT, and is opposed to the prevention ring 300.

The inner peripheral surface 217 is connected to the radially inner end of the outer surface 215 and extends from the inner end toward the inner side in the axial direction. The inner peripheral surface 217 is opposed to 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 toward the outer peripheral surface OSF of the shaft SFT and toward the outer space. The dustproof lip 230 is crimped on the outer peripheral surface OSF of the shaft SFT to prevent foreign matter suspended 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 closer to the inner side in the axial direction than the dust lip 230 and includes a crimping portion 221 and a connecting portion 222. The crimping portion 221 is connected to the dust lip 230 by the connecting portion 222, and is crimped to the shaft SFT between the dust lip 230 and the prevention ring 300 Outer peripheral surface OSF. The main lip 220 prevents liquid from flowing into the inner space through the dust lip 230. In addition, the main lip 220 also prevents the lubricating oil from flowing out toward the outer space through the prevention ring 300. In this embodiment, the surface area of the main lip 220 is an example of the sealing portion that is crimped to the surface of the device APT. The surface of the device is exemplified by the outer peripheral surface OSF of the shaft SFT.

The connecting portion 222 protrudes toward the axially inner side (that is, toward the prevention ring 300) of the inner surface 216 of the main ring portion 210, and is connected to the crimping portion 221. As described above, since the dust lip 230 prevents the intrusion of foreign objects floating in the external space, the foreign objects hardly enter the space surrounded by the dust lip 230, the connecting portion 222, the crimping portion 221, and the outer peripheral surface OSF of the shaft SFT.

The spring ring 240 is inserted into an annular groove formed on the outer circumferential surface of the pressing portion 221 of the main lip 220 (that is, the surface facing the first region 218 of the inner surface 216 of the main ring portion 210 in the radial direction). When the shaft SFT is fitted into the sealing member 200, the spring ring 240 elastically stretches. As a result, a force toward the rotation axis RAX acts on the crimping portion 221, and the crimping portion 221 is elastically compressed and deformed. Therefore, a good sealing structure is formed at the boundary between the crimping portion 221 and the outer peripheral surface OSF of the shaft SFT. In this embodiment, the pressing part is exemplified by the spring ring 240. Alternatively, the pressing portion may be formed of another member that is elastically elongated corresponding to the insertion 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 320. The ring wall 310 includes an inner contact surface 311, an outer contact surface 312, an outer peripheral surface 313, and an inner peripheral surface 314.

The outer peripheral surface 313 extends 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 from the end toward the inner side in the radial direction. The inner abutting surface 311 is located near the outer peripheral surface 313 and includes: an outer peripheral area that abuts against the shoulder surface SSF of the housing HSG; and an inner peripheral area that faces 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. External abutment The surface 312 is connected to the other end of the outer circumferential surface 313 in the axial direction (the end connected to the inner abutting surface 311 is the opposite end), and extends from the other end toward the inner side in the radial direction. The outer abutting surface 312 includes: an outer peripheral area that abuts against the first abutting surface 213 of the sealing member 200; and an inner peripheral area that opposes the second area 219 of the inner surface 216 of the sealing member 200 in the axial 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 in diameter than the shaft SFT. The inner peripheral surface 314 is opposed to the outer peripheral surface OSF of the shaft SFT in the radial direction. The lip 320 is located 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 is formed with an outer circumferential surface 313, an inner circumferential surface 314, and an inner abutting surface 311. In addition, the elastic wall 315 also forms a part of the outer abutment surface 312.

The rigid ring 316 is greater in rigidity than the elastic wall 315. It is feasible that the elastic wall 315 is formed of a rubber material or a resin material having elasticity, and on the other hand, the rigid ring 316 is formed of a metal or a hard resin. Since the rigid ring 316 maintains the shape of the ring wall 310, the operator can easily arrange the prevention ring 300 in the device APT. The principle of this embodiment is not limited to the specific materials used for the elastic wall 315 and the rigid ring 316.

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

The lip 320 is formed integrally with the elastic wall 315. The lip 320 may be formed of the same material as the elastic wall 315. The lip 320 protrudes from the inner peripheral surface 314 of the ring wall 310 (the inner peripheral edge of the elastic wall 315) toward the shaft SFT. The lip 320 is slightly bent toward the inner space near the outer peripheral surface OSF of the shaft SFT, and is pressed against the outer peripheral surface OSF. As a result, the crimping portion 221 is separated from the internal space by the preventing ring 300. In this embodiment, the inner peripheral edge is exemplified by the inner peripheral surface 314 of the ring wall 310.

Figure 1 shows the iron powder IPD produced in the internal space. For example, the iron powder IPD is generated from the tooth surface of the gear arranged in the device APT. The principle of this embodiment is not limited to a specific source of generation of iron powder IPD.

The iron powder IPD may try to enter the boundary between the crimping portion 221 and the outer peripheral surface OSF of the shaft SFT as a foreign matter. However, as shown in FIG. 1, since the lip 320 blocks the iron powder IPD, the iron powder IPD hardly enters the space formed between the prevention ring 300 and the sealing member 200. Therefore, the iron powder IPD has a very small risk of rubbing the boundary between the crimping portion 221 and the outer peripheral surface OSF of the shaft SFT. As a result, the sealing body 100 can exhibit good sealing performance for a long period of time. In this embodiment, the prevention part is exemplified by the prevention ring 300.

The lip 320 can also be pressed against the outer peripheral surface OSF of the shaft SFT with a weaker force than the pressing part 221. As a result, the friction force generated between the shaft SFT and the sealing body 100 does not become unnecessarily high. In this embodiment, the first crimping force is exemplified by the compression force (that is, the pressing force generated by the spring ring 240) acting on the crimping portion 221. The second crimping force is exemplified by the force of pressing the lip 320 to the outer peripheral surface OSF of the shaft SFT.

<Second Embodiment>

The prevention ring explained in connection with the first embodiment has a composite structure including an elastic material and a rigid material. However, the prevention ring can also be formed of a single material. In the second embodiment, an exemplary sealing body having a prevention ring formed of a single material will be described.

FIG. 2 is a schematic cross-sectional view of the sealing body 100A of the second embodiment. The sealing body 100A will be described with reference to FIG. 2. The description of the above-mentioned embodiment refers to the elements assigned the same reference numerals as those of the above-mentioned embodiment.

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

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

The prevention ring 300A includes an inner contact surface 311A, an outer contact surface 312A, an outer peripheral surface 313A, and an inner peripheral surface 314A. The outer peripheral surface 313A extends in the axial direction and abuts against the first inner peripheral surface FIS of the housing HSG. The inner abutting surface 311A is connected to one end of the outer peripheral surface 313A in the axial direction, and extends from the end toward the inner side in the radial direction. The inner abutting surface 311A is near the outer circumferential surface 313A and includes: an outer circumferential area that abuts on the shoulder surface SSF of the housing HSG; and an inner circumferential area 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 circumferential surface 313A (the end connected to the inner abutting surface 311A is the opposite end), and extends from the other end toward the radially inner side. The outer abutting surface 312A includes: an outer peripheral area that abuts against the first abutting surface 213 of the sealing member 200; and an inner peripheral area that faces the second area 219 of the inner surface 216 of the sealing member 200 in the axial 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 peripheral surface 314A extends in the axial direction and abuts the outer peripheral surface OSF of the shaft SFT. Therefore, the sealing member 200 is prevented from being separated from the internal space by the ring 300A.

As shown in FIG. 2, the iron powder IPD suspended in the internal space is captured by the abutting surface 311A in the prevention ring 300A. Therefore, the iron powder IPD hardly enters the gap between the preventing ring 300A and the sealing member 200. Since the iron powder IPD causes a very small risk of rubbing the boundary between the crimping portion 221 and the outer peripheral surface OSF of the shaft SFT, the sealing body 100A can exhibit good sealing performance for a long period of time.

<3rd Embodiment>

Regarding the above-mentioned embodiment, the preventing part that blocks foreign matter generated inside the device is formed by a member different from the sealing member. Alternatively, the prevention part may be formed integrally with the sealing member. In this case, the operator can easily attach the sealing body to the device. In the third embodiment Here, an exemplary sealing body having a prevention part integrated with the sealing member will be described.

FIG. 3 is a schematic cross-sectional view of the sealing body 100B of the third embodiment. The sealing body 100B will be described with reference to FIGS. 1 and 3. The description of the above-mentioned embodiment is used for the elements assigned the same reference numerals as those of the above-mentioned embodiment.

The sealing body 100B includes an annular sealing member 200B and a lip 320B. The lip 320B is the same as the lip 320 described with reference to FIG. 1 and is used to block the iron powder IPD. The difference from the above-mentioned embodiment is that the lip 320B is integrated with the sealing member 200B. In this embodiment, the prevention part is exemplified by the lip 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 applied to these elements.

The sealing member 200B further includes an annular main lip 220B. As in the first embodiment, the main lip 220B includes a connecting portion 222. The description of the first embodiment is applied to the connecting portion 222.

The main lip 220B further includes a crimping portion 221B. The crimping portion 221B is crimped to the outer peripheral surface OSF of the shaft SFT by the spring ring 240 between the dust lip 230 and the lip 320B. The main lip 220B prevents liquid from flowing into the internal space through the dust lip 230. In addition, the main lip 220B also prevents the lubricating oil from flowing out toward the outer space through the lip 320B. In this embodiment, the surface area of the main lip 220B is an example of the sealing portion that is crimped to the surface of the device APT.

The lip 320B is formed integrally with the crimping portion 221B. The lip 320B protrudes from the crimping 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 crimping portion 221B is surrounded by the spring ring 240, while on the other hand, the lip 320B is not surrounded by the spring ring 240. Therefore, the pressing force generated by the elastic deformation of the spring ring 240 strongly acts on the crimping portion 221B, while on the other hand, it acts weakly on the lip portion 320B. As a result, the sealing body The frictional force between 100B and the outer peripheral surface OSF of the shaft SFT will not become unnecessarily high.

The surface area of the crimping portion 221B crimped to the outer peripheral surface OSF of the shaft SFT is separated from the inner space and the outer space by the lip 320B and the dust-proof lip 230. Therefore, the iron powder IPD floating in the inner area or the foreign matter floating in the outer space is not likely to cause rubbing at the boundary between the crimping portion 221 and the shaft SFT.

<Fourth Embodiment>

Since the dust-proof lip is exposed in the external space, the operator can recognize whether the dust-proof lip incorporated into the device is bent. However, since the lip for blocking foreign objects generated in the internal space is exposed in the internal space, the operator cannot recognize whether the sealing body and the lip are bent. If the lip is bent in the device, foreign matter suspended in the internal space may reach the main lip, causing the boundary between the shaft and the main lip to rub across. In the fourth embodiment, an exemplary technique for reducing the risk of bending the lips in the device will be described.

FIG. 4 is a schematic cross-sectional view of the sealed adapter 400 of the fourth embodiment. The sealed adapter 400 will be described with reference to FIGS. 1, 3 and 4. The description of the above-mentioned embodiment is used for the elements assigned the same reference numerals as those of the above-mentioned embodiment.

The sealed adapter 400 includes a sealing body 100C, a bearing 410, a retaining ring 420, and an adapter barrel 430. The sealing body 100C may also be the sealing body 100 described with reference to FIG. 1. Alternatively, the sealing body 100C may also be the sealing body 100B described with reference to FIG. 3. The description about the sealing bodies 100 and 100B is applied to the sealing body 100C.

The adapter barrel 430 includes a ring-shaped flange 431 and a retaining barrel 432. The flange 431 includes an inner surface 441, an outer surface 442 facing the side opposite 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 outer peripheral surface facing the side opposite to the inner surface 443 444, and a shoulder surface 445 extending from the inner peripheral surface 443 toward the radially inner side. The inner surface 441 abuts against the surface of the housing (not shown) surface. The inner surface 441 and the opposite outer surface 442 are exposed to the external space. A plurality of insertion holes 446 extending from the outer surface 442 toward the inner surface 441 are formed in the flange 431. A plurality of screws are respectively inserted into the plurality of insertion holes 446 and screwed with the screw holes formed in the housing. Then, the flange 431 is fixed to the housing. In this embodiment, the mounting part is exemplified by the flange 431.

The outer peripheral surface 444 surrounds the inner peripheral surface 443. The axial length of the outer peripheral surface 444 is approximately the same as the depth of the circular recess (not shown) formed in the housing. The diameter of the outer peripheral surface 444 is approximately the same as the diameter of the circular recess formed in the housing.

The inner circumferential surface 443 on the opposite side of the outer circumferential surface 444 forms a space for inserting a shaft (not shown). The diameter of the inner peripheral surface 443 is greater than the diameter of the shaft. Therefore, the inner peripheral surface 443 surrounds the shaft, and an annular space is formed between the inner peripheral surface 443 and the outer peripheral surface of the shaft (not shown). The sealing body 100C is embedded in the annular space.

The diameter of the inner peripheral surface 443 is larger than the inner diameter of the holding cylinder 432. Therefore, a shoulder surface 445 is formed between the inner peripheral surface 443 and the holding tube 432. The shoulder surface 445 is an annular surface formed along an imaginary plane orthogonal to the rotation axis RAX. The operator can press the sealing body 100C into the space formed by the inner peripheral surface 443 and press it against the shoulder surface 445.

The holding cylinder 432 protrudes from the shoulder surface 445 toward the internal space. The holding cylinder 432 includes a main portion 451 and a front end portion 452. The front end portion 452 is smaller in inner diameter than the main portion 451. Therefore, the front end portion 452 protrudes toward the rotation axis RAX from the main portion 451. The operator presses the bearing 410 into the holding cylinder 432 to abut the tip portion 452.

The main portion 451 includes an inner peripheral surface 453 abutting against the outer race of the bearing 410. An annular groove surrounding the rotation axis RAX is formed on the inner peripheral surface 453. After inserting the bearing 410 into the holding cylinder 432, the operator inserts the retaining ring 420 into the annular groove formed in the inner peripheral surface 453. Since the bearing 410 is sandwiched between the retaining ring 420 and the front end portion 452, the bearing 410 is not positioned in the extending direction of the rotation axis RAX. After attaching the retaining ring 420 to the holding cylinder 432, the operator fits the sealing body 100C into the flange 431. So it's over Manufacture of the sealed adapter 400.

FIG. 5 is a schematic diagram of the installation steps for installing the shaft SFT on the sealing adapter 400. The installation procedure will be described with reference to FIG. 1, FIG. 3, and FIG. 5.

The shaft SFT is inserted into the sealing adapter 400 in the direction from the outer space to the inner space (that is, the direction from the outer surface 442 of the flange 431 to the inner surface 441). 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. Therefore, the axis SFT can rotate around the rotation axis RAX.

As described in connection with FIGS. 1 and 3, since the lips 320 and 320B protrude toward the inner space, the protruding direction of the lips 320 and 320B coincides with the insertion direction of the shaft SFT. During the insertion of the shaft SFT, the lips 320 and 320B can maintain the posture of protruding toward the bearing 410, so the lips 320 and 320B are not easy to bend.

The shaft SFT includes a gear shaft GSF and a shaft tube STT. The base end of the gear shaft GSF is embedded in the shaft tube STT. A gear part GPT is formed at the front end of the gear shaft GSF. The gear part GPT meshes with other gears arranged in the device (not shown). The iron powder IPD described with reference to FIGS. 1 and 3 can be generated by the meshing between the gear part GPT and other gears.

The shaft tube STT includes a first tube portion FTB and a second tube portion STB. The second cylindrical portion STB extends from the first cylindrical portion FTB toward the internal space. The first cylindrical portion FTB is larger in outer diameter than the second cylindrical portion STB. Therefore, the shoulder surface SLD is formed at the boundary between the first cylindrical portion FTB and the second cylindrical portion STB. The operator inserts the shaft SFT into the seal adapter 400 until the shoulder surface SLD abuts the bearing 410. As a result, the sealing body 100C is accommodated in the annular space formed between the outer peripheral surface OSF of the first cylindrical portion FTB and the inner peripheral surface 443 of the flange 431. The front ends of the lips 320 and 320B described with reference to FIGS. 1 and 3 are crimped 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 tube 432 and the outer peripheral surface OSF of the second tube portion STB. In this implementation In the method, the surface of the device is exemplified by the outer peripheral surface OSF of the shaft tube STT.

As shown in the left diagram of FIG. 5, an annular groove AGV is formed on the outer peripheral surface OSF of the second cylindrical portion STB. If the shoulder surface SLD abuts the bearing 410, the annular groove AGV appears in the circular space surrounded by the front end 452 of the holding cylinder 432. As shown in the right picture of Figure 5, the operator inserts the retaining ring SPR into the annular groove AGV. As a result, the inner race of the bearing 410 is sandwiched between the shoulder surface SLD and the retaining ring SPR. On the other hand, the outer race of the bearing 410 is sandwiched between the front end 452 of the retaining cylinder 432 and the retaining ring 420. Therefore, the bearing 410 is fixed in the holding cylinder 432 in the extending direction of the rotation axis RAX.

FIG. 6 is a schematic diagram of the installation steps of installing the assembly including the shaft SFT and the sealing adapter 400 to the housing HSH. The installation procedure will be described with reference to FIGS. 1 and 3 to 6.

The housing HSH includes an outer end surface OES, a concave surface RCS that forms a step with respect to the outer end surface OES, and a holding wall surface SWS extending axially from the inner end of the concave surface RCS. The outer end surface OES is exposed to the external space. The concave surface RCS is recessed from the outer end surface OES around the rotation axis RAX. The flange 431 is received in the 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 surface SWS forms a through hole, and the through hole forms a part of the internal space. The shaft SFT penetrates through the through hole. The holding cylinder 432 is inserted into the through hole formed by the holding wall surface SWS. The holding cylinder 432 is supported by the holding wall SWS.

According to the principle of the present embodiment, after the operator completes the assembly including the shaft SFT and the sealing adapter 400, the assembly is assembled in the housing HSH. As explained with reference to FIG. 5, the lips 320 and 320B (refer to FIGS. 1 and 3) are not easily bent during the production of the assembly. When the assembly is assembled toward the housing HSH, the adapter barrel 430 exists between the sealing body 100C and the housing HSH Therefore, the sealing body 100C does not interfere with the housing HSH. Therefore, the lips 320 and 320B can maintain the state of being pressed against the outer peripheral surface OSF of the shaft SFT without bending. Since the lips 320 and 320B can effectively block the iron powder IPD generated from the gear part GPT or other sliding parts (refer to Figure 1 and Figure 3), the risk of iron powder IPD damage to the sealing function of the sealing body 100C is greatly reduced. .

<Fifth Embodiment>

In order to reduce the friction between the dust lip and the shaft, grease is applied. As explained in connection with the first embodiment, since the dust-proof lip is arranged near 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 in order to reduce the friction between the gears can be in contact with the grease layer at the boundary between the main lip and the shaft. Although it depends on the combination of lubricating oil and grease components, the contact of lubricating oil to the grease layer may cause oil stains on the boundary between the main lip and the shaft. Oil stains act as foreign matter and can cause the main lip to be rubbed. In the fifth embodiment, an exemplary technique for reducing the risk of oil contamination is explained.

Fig. 7 is a schematic cross-sectional view of a sealing member 200D of the fifth embodiment. The sealing member 200D will be described with reference to FIG. 7. The description of the above-mentioned embodiment is used for the elements assigned the same reference numerals as those of the above-mentioned 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 applied to these elements.

Figure 7 shows the device APU. As in the first embodiment, the device APU includes a housing HSG. The description of the first embodiment is applied to the housing HSG.

The device APU further includes a shaft SFU. The shaft SFU is surrounded by the housing HSG. The sealing member 200D is embedded in the annular space formed between the housing HSG and the shaft SFU to prevent fluid from flowing between the external space and the internal space.

The shaft SFU includes: a first outer peripheral surface FOS; a second outer peripheral surface SOS, which is located axially outside of the first outer peripheral surface FOS; and a tapered peripheral surface TPC, which connects the first outer peripheral surface FOS and the second outer peripheral surface SOS, and It is inclined to reduce the diameter of the shaft SFU toward the outside in the axial direction. At least a part of the internal space is formed between the housing HSG and the first outer peripheral 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 part is exemplified by the spring ring 240.

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

The sealing member 200D further includes a dust lip 230D extending from the inner peripheral surface 217 of the main ring portion 210 toward the second outer peripheral surface SOS. The dust lip 230D includes a front end 231 that abuts on the second outer peripheral surface SOS. That is, the front end 231 is crimped to the surface of the shaft SFU on the outer side of the main lip 220.

The inner diameter of the dust lip 230D determined by the front end 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 pressed against the second outer circumferential surface SOS excessively. In this embodiment, the surface of the device is exemplified by the first outer peripheral surface FOS and the second outer peripheral surface SOS.

The operator applies grease on the second outer peripheral surface SOS, and the friction between the front end portion 231 and the second outer peripheral surface SOS can be reduced. The tapered peripheral surface TPC between the first peripheral surface FOS and the second peripheral surface SOS prevents the grease applied on the second peripheral surface SOS from migrating to the first peripheral surface FOS. Therefore, the grease is not easy to contact with the lubricating oil contained in the internal space. This situation means that the risk of oil contamination between the main lip 220 and the first outer peripheral surface FOS is reduced. As a result, the risk of rubbing of the main lip 220 and the first outer peripheral surface FOS is also reduced.

The design principles explained in connection with the above-mentioned respective embodiments can be applied to various sealing structures. One of the features explained in connection with one of the above-mentioned embodiments It can also be applied to the sealing technology described in connection with another embodiment.

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

The sealing body of the above-mentioned embodiment prevents fluid from flowing between the external space on the outside of the device and the internal space on the inside of the aforementioned device. The sealing body includes: a sealing member having a sealing part crimped to the surface of the device; and a preventing part that prevents foreign matter generated in the internal space from entering between the sealing part and the surface of the device.

According to the above-mentioned structure, since the sealing body is provided with the prevention portion for preventing the foreign matter generated in the internal space from entering the sealing portion, it is unlikely that the sealing performance is reduced due to the foreign matter generated inside the device.

Regarding the above configuration, the prevention portion may include a lip portion that is crimped on the surface of the device. The said lip part isolates the said sealing part from the said internal space.

According to the above-mentioned configuration, since the lip portion that is crimped on the surface of the device isolates the sealing portion from the internal space, it is difficult for foreign matter generated in the internal space of the device to reach the sealing portion. Therefore, it is not easy to produce a reduction in the sealing performance due to foreign matter generated inside the device.

With regard to the above configuration, the sealing portion can be pressed against the surface of the device by the first crimping force. The lip portion can be pressed by a second pressing force that is smaller than the first pressing force.

According to the above configuration, since the lip portion is pressed by the second pressing force which is smaller than the first pressing force, the frictional force between the sealing body and the surface of the device is not excessively increased. Therefore, the sealing body does not produce excessive resistance against the action of the device.

Regarding the above configuration, the prevention portion may be a prevention ring arranged in the annular space formed in the device. The prevention ring may include: a ring-shaped elastic wall having an inner peripheral edge for the lip to protrude; and a rigid ring that is fixed to the elastic wall in a manner surrounding the inner peripheral edge and has a height higher than the elastic wall rigidity.

According to the above-mentioned structure, 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 arranges the prevention ring in the annular space formed in the device , The elastic wall is not easy to deform. Therefore, the operator can easily attach the sealing body to the device. Since the lip integrally formed with the elastic wall protrudes from the inner periphery of the elastic wall, when the operator arranges the prevention ring in the annular space formed in the device, the lip is pressed against the surface of the device. As a result, foreign matter generated in the internal space of the device cannot easily reach the sealing portion. Therefore, it is not easy to produce a reduction in the sealing performance due to foreign matter generated inside the device.

Regarding the above configuration, the prevention portion and the sealing member may be integrated.

According to the above-mentioned structure, since the prevention part and the sealing member are integrated, the operator can easily attach the sealing body to the device.

Regarding the above configuration, it is possible that the sealing member has the sealing portion, and includes an annular crimping portion arranged in an annular space formed in the device, and a pressing portion for pressing the crimping portion against the device The pressing part of the aforementioned surface. The lip portion may be integrated with the crimping portion, and may protrude from the crimping portion toward the inner space.

According to the above configuration, since the annular crimping portion arranged in the annular space formed in the device is pressed against the surface of the device by the pressing portion, the sealing body can have a good sealing function. Since the lip part and the crimping part are integrated, the operator can easily install the sealing body to the device. Since the lip protrudes from the crimping portion toward the internal space and abuts against the surface of the device, the lip can prevent foreign matter generated in the device from reaching the crimping portion. Therefore, it is not easy to produce a reduction in the sealing performance due to foreign matter generated inside the device.

The sealing adapter of the above-mentioned embodiment is arranged between the housing of the device and the shaft inserted in the through hole formed in the housing, and is provided with the above-mentioned sealing body and the mounting part installed in the housing . The mounting portion includes an inner peripheral surface surrounding the shaft. The aforementioned shaft has as the front The outer peripheral surface of the aforementioned surface of the device. The annular space is formed between the outer peripheral surface of the shaft and the inner peripheral surface of the mounting portion.

According to the above-mentioned structure, the annular space in which the sealing body is arranged is formed between the outer peripheral surface of the shaft and the inner peripheral surface of the mounting part. Therefore, the operator installs the mounting part on the housing of the device and arranges the shaft When in the housing, the internal space formed by the housing and the outer peripheral surface of the shaft is separated from the external space on the outer side of the device by the sealing body. Since the sealing body has the preventing part, foreign matter generated in the internal space will not reach the sealing part of the sealing member. Therefore, the sealing performance of the sealing portion can be maintained for a long period of time.

With respect to the above configuration, the sealed adapter may further include a holding tube extending from the mounting portion toward the inner space, and a bearing inserted between the holding tube and the outer peripheral surface of the shaft. The lip portion may protrude from the elastic wall or the crimping portion toward the bearing and be crimped to the outer peripheral surface of the shaft.

According to the above configuration, since the bearing is inserted between the outer peripheral surface of the shaft and the holding cylinder extending from the mounting portion toward the inner space, the shaft can rotate in the housing. Alternatively, the housing can rotate about an axis. Since the lip protrudes from the elastic wall or the crimping portion toward the bearing and is crimped on the outer peripheral surface of the shaft, if the operator inserts the shaft into the bearing via the sealing body, the insertion direction of the shaft and the protruding direction of the lip are consistent. Therefore, the lip is not easy to bend on the outer peripheral surface of the shaft.

The sealing member of the above-mentioned embodiment is arranged in the annular space formed in the device to prevent fluid from flowing between the external space outside the device and the internal space inside the device. The sealing member is provided with: a ring-shaped main lip having a sealing portion crimped on the surface of the device; a pressing portion that presses the main lip against the surface of the device; and a dust-proof lip, which is more compact than the main lip. Close to the outside and pressed against the aforementioned surface of the aforementioned device. The inner diameter of the dust-proof lip is smaller than the sealing portion.

With regard to the above configuration, since the inner diameter of the dust lip is smaller than the sealing part, the designer can design the surface of the device in a way that a step is formed between the part where the dust lip abuts and the part where the main lip abuts. Therefore, since the grease applied on the boundary between the dust lip and the surface of the device is separated by the position where the stepped main lip abuts, the amount of grease and the lubricating oil contained in the internal space of the grease and the device is greatly reduced. The risk of oil pollution caused by contact. Since the oil stain is not easily intervened in the boundary between the sealing portion and the surface of the device, it is not easy to cause the degradation of the sealing performance due to the oil stain generated inside the device.

100: Seal body

200: Sealing member

210: Main Ring

211: Metal ring

212: Coating layer

213: The first abutment surface

214: 2nd abutment surface

215: Outer surface

216: Inside

217: Inner Circumference

218: Zone 1

219: Zone 2

220: main lip

221: crimping part

222: Connection

230: Dust Lip

240: spring ring

300: Prevent ring

310: Ring Wall

311: Inner Abutment Surface

312: Outer abutment surface

313: Outer peripheral surface

314: inner peripheral surface

315: Elastic Wall

316: rigid ring

320: Lips

APT: device

FIS: 1st inner peripheral surface

HSG: shell

IPD: iron powder

OSF: outer peripheral surface

RAX: Rotation axis

SFT: Shaft

SIS: 2nd inner peripheral surface

SSF: Shoulder

Claims (5)

A sealing adapter, which is arranged between the housing of the device and the shaft inserted into the through hole formed in the housing, and is provided with a sealing body, and a mounting part installed in the housing, and the sealing system For preventing fluid from flowing between the external space on the outside of the device and the internal space inside the device, the sealing body is provided with: a sealing member having a sealing portion crimped on the surface of the device, and a preventing portion, which prevents Foreign matter generated in the internal space invades between the sealing portion and the surface of the device, the prevention portion includes a lip that is crimped on the surface of the device, and the lip isolates the sealing portion from the internal space, The prevention part is a prevention ring arranged in the annular space formed in the device, and the prevention ring includes: a ring-shaped elastic wall having the inner periphery of the lip protruding; and a rigid ring that surrounds the foregoing The inner peripheral edge is fixed to the elastic wall and has higher rigidity than the elastic wall. The mounting portion includes an inner peripheral surface surrounding the shaft, the shaft has an outer peripheral surface as the surface of the device, and the annular space Is formed between the outer peripheral surface of the shaft and the inner peripheral surface of the mounting portion, the sealing adapter further includes: extending from the mounting portion toward the inner space A holding tube and a bearing inserted between the holding tube and the outer peripheral surface of the shaft, and the lip protrudes from the elastic wall toward the bearing, and is press-contacted to the outer peripheral surface of the shaft. A sealing adapter, which is arranged between the housing of the device and the shaft inserted into the through hole formed in the housing, and is provided with a sealing body, and a mounting part installed in the housing, and the sealing system For preventing fluid from flowing between the external space on the outside of the device and the internal space inside the device, the sealing body is provided with: a sealing member having a sealing portion crimped on the surface of the device, and a preventing portion, which prevents Foreign matter generated in the internal space invades between the sealing portion and the surface of the device, the prevention portion includes a lip that is crimped on the surface of the device, and the lip isolates the sealing portion from the internal space, The sealing member has the sealing portion, and includes an annular crimping portion arranged in an annular space formed in the device, a pressing portion that presses the crimping portion on the surface of the device, and the lip portion Integral with the crimping portion and protruding from the crimping portion toward the inner space, the mounting portion includes an inner peripheral surface surrounding the shaft, The shaft has an outer peripheral 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 mounting portion, and the sealing adapter further includes: from the mounting portion A retaining tube extending toward the inner space, and a bearing inserted between the retaining tube and the outer peripheral surface of the shaft, and the lip protrudes from the crimping portion toward the bearing and is crimped to the outer periphery of the shaft surface. The sealing adapter of claim 1 or 2, wherein the sealing portion is pressed against the surface of the device with a first crimping force, and the lip is pressed with a second crimping force that is smaller than the first crimping force . The sealing adapter of claim 1 or 2, wherein the prevention portion is integrated with the sealing member. A sealing member is arranged in the annular space formed in the device to prevent fluid from flowing between the external space on the outside of the device and the internal space on the inside of the device, and is provided with: a ring-shaped main lip, It has a sealing portion that is crimped on the surface of the device; a pressing portion that presses the main lip on the surface of the device; and a dust-proof lip that is pressed on the surface of the device on the outside than the main lip ; And the inner diameter of the aforementioned dust lip is smaller than the aforementioned sealing portion.

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