CN116576297A - Sealing device - Google Patents
Sealing device Download PDFInfo
- Publication number
- CN116576297A CN116576297A CN202310467386.6A CN202310467386A CN116576297A CN 116576297 A CN116576297 A CN 116576297A CN 202310467386 A CN202310467386 A CN 202310467386A CN 116576297 A CN116576297 A CN 116576297A
- Authority
- CN
- China
- Prior art keywords
- lip
- peripheral wall
- sealing device
- wall portion
- hollow hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 36
- 230000002093 peripheral effect Effects 0.000 claims abstract description 79
- 229920001971 elastomer Polymers 0.000 claims abstract description 12
- 238000005452 bending Methods 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 18
- 239000007769 metal material Substances 0.000 claims description 14
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 description 11
- 230000007797 corrosion Effects 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
- F16K41/04—Spindle sealings with stuffing-box ; Sealing rings with at least one ring of rubber or like material between spindle and housing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Sealing Devices (AREA)
Abstract
The application provides a sealing device. The internal stress applied to the retainer ring is reduced, and the durability of the retainer ring is improved. A lip seal (22) seals between a housing (11) having a hollow hole (13) and a drive shaft (16) inserted into the hollow hole (13). The lip seal (22) comprises a metal retaining ring (30) pressed into the hollow hole (13) and a rubber sealing lip (40) disposed inside the retaining ring (30). The seal lip (40) has an annular body portion (41) and a lip portion (45) capable of sliding contact with the outer peripheral surface of the drive shaft (16). The retaining ring (30) has a peripheral wall (31), the peripheral wall (31) is cylindrical, one end of the peripheral wall (31) has an annular plate-shaped end wall bent in an L-shaped cross section toward the radial inner side via a bent portion, and the other end of the peripheral wall (31) is not formed with a bent portion bent toward the radial inner side. A main body (41) is joined to the peripheral wall (31).
Description
The application is a divisional application of an application patent application with the application number of 202010327151.3, the application date of 2020, 4 and 23, and the priority date of 2019, 4 and 23, and the name of the application is a sealing device.
Technical Field
The technology disclosed in this specification relates to a sealing device. More particularly, the present application relates to a sealing device for sealing between a housing having a hollow hole and a shaft member inserted into the hollow hole.
Background
Conventionally, as a sealing device for sealing between a housing having a hollow hole and a shaft member inserted into the hollow hole, there is a lip seal described in patent document 1, for example. Fig. 7 is a cross-sectional view showing a lip seal. As shown in fig. 7, the lip seal 120 is used to seal between the housing 100 having the hollow hole 101 and the shaft member 110 inserted into the hollow hole 101. The lip seal 120 includes a metal retaining ring 130 press-fitted into the hollow hole 101, and a rubber sealing lip 140 disposed inside the retaining ring 130. The seal lip 140 is formed in a circular ring plate shape. The retainer ring 130 has a cylindrical peripheral wall 131. An annular plate-shaped end wall portion 134 is formed at one end of the peripheral wall portion 131, and is bent in an L-shaped cross section toward the radial direction inside via a 1 st bending portion 133. A cylindrical inner wall portion 137 is formed at the other end of the peripheral wall portion 131, and is bent in a U-shape in cross section toward the radial inner side via a 2 nd bending portion 136. An outer peripheral portion of the seal lip 140 is sandwiched between the end wall portion 134 and the distal end portion 137a of the inner wall portion 137.
Patent document 1: japanese patent application laid-open No. 2012-149725
Disclosure of Invention
Problems to be solved by the application
According to the conventional lip seal 120, the 1 st and 2 nd curved portions 133 and 136 of the retainer ring 130 are subjected to internal stress caused by bending. Further, since the 2 nd bending portion 136 is bent to approximately 180 °, a higher internal stress is applied to the 2 nd bending portion 136 than the 1 st bending portion 133. Further, by pressing the retainer ring 130 into the housing 100, the stress applied to the two bent portions 133 and 136 is increased. Therefore, the durability of the retaining ring 130 may be reduced.
The technology disclosed in the present specification aims to reduce the bending portion of the retaining ring and improve the durability of the retaining ring.
Solution for solving the problem
In order to solve the above problems, the technology disclosed in the present specification adopts the following means.
In aspect 1, there is provided a sealing device for sealing between a housing having a hollow hole and a shaft member inserted into the hollow hole, wherein the sealing device includes: a retaining ring made of a metal material, which is pressed into the hollow hole; and a seal lip made of a rubber material, which is disposed inside the retainer ring, the seal lip having an annular main body portion and a lip portion that is capable of sliding contact with an outer peripheral surface of the shaft member, the retainer ring having a peripheral wall portion that is cylindrical, one end portion of the peripheral wall portion having an annular plate-shaped end wall portion that is bent in an L-shaped cross section toward a radial direction inside via a bent portion, the other end portion of the peripheral wall portion not having a bent portion that is bent toward the radial direction inside, the main body portion being joined to the peripheral wall portion.
According to the 1 st aspect, the body portion of the seal lip is joined to the peripheral wall portion of the retainer ring, and the bent portion is formed at one end portion of the peripheral wall portion, but the bent portion bent radially inward is not formed at the other end portion of the peripheral wall portion. Therefore, compared with the conventional sealing device, the bending portion of the retaining ring can be reduced, and the durability of the retaining ring can be improved. A circular annular plate-shaped end wall portion 34 is formed at one end of the peripheral wall portion of the retainer ring, and is bent in an L-shaped cross section toward the radial direction inside via a bending portion 33. Therefore, when the retainer ring is pushed into the housing, the peripheral wall portion is easily pushed into the hollow hole of the housing by the R surface portion outside the bent portion, whereby the push-in property of the retainer ring can be improved.
The seal device according to claim 1, wherein the seal device according to claim 2 is provided with a tapered surface portion which gradually decreases in outer diameter as going forward (japanese: forward) at the other end portion of the peripheral wall portion.
According to claim 2, when the retainer ring is pushed into the housing, the tapered surface portion can easily push the peripheral wall portion into the hollow hole of the housing, thereby improving the pushing-in property of the retainer ring.
The sealing device according to claim 1 or 2, wherein the sealing device according to claim 3 is formed with a cover portion covering an inner peripheral side end portion of the end wall portion in the main body portion.
According to claim 3, peeling of the main body portion of the seal lip from the end wall portion side of the retainer ring can be suppressed.
A 4 th aspect is a sealing device that seals between a housing having a hollow hole and a shaft member inserted in the hollow hole, the sealing device including: a retaining ring made of a metal material, which is pressed into the hollow hole; and a seal lip made of a rubber material, which is disposed inside the retainer ring, the seal lip having an annular main body portion and a lip portion that is capable of sliding contact with an outer peripheral surface of the shaft member, the retainer ring having a peripheral wall portion that is cylindrical, and both end portions of the peripheral wall portion are not formed with a bent portion that is bent inward in a radial direction, and the main body portion being joined to the peripheral wall portion.
According to the 4 th aspect, the body portion of the seal lip is joined to the peripheral wall portion of the retainer ring, and the bent portions bent radially inward are not formed at both end portions of the peripheral wall portion. Therefore, compared with the conventional sealing device, the bending portion of the retaining ring can be reduced, and the durability of the retaining ring can be improved.
The sealing device according to claim 4, wherein the sealing device according to claim 5 is provided with a tapered surface portion which gradually decreases in outer diameter as going forward, at least one end portion of the peripheral wall portion.
According to claim 5, when the retainer ring is pushed into the housing, the tapered surface portion can easily push the peripheral wall portion into the hollow hole of the housing, and thus the push-in property of the retainer ring can be improved. In addition, when tapered surface portions are formed at both end portions, the peripheral wall portion of the retainer ring can be pressed into the housing from either tapered surface portion side of the peripheral wall portion of the retainer ring.
The sealing device according to any one of claims 1 to 5, wherein a metal material of the retainer ring of the sealing device of claim 6 is SUS material.
According to the 6 th aspect, corrosion of the retainer ring can be suppressed by corrosion resistance of the SUS material. This makes it possible to properly use the sealing device in an exhaust gas condensed water environment, for example.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the technology disclosed in the present specification, the bending portion of the retainer ring can be reduced, and the durability of the retainer ring can be improved.
Drawings
Fig. 1 is a cross-sectional view showing an EGR valve according to embodiment 1.
Fig. 2 is a cross-sectional view showing a peripheral portion of the lip seal.
Fig. 3 is a cross-sectional view showing a lip seal.
Fig. 4 is a cross-sectional view showing the IV part of fig. 3.
Fig. 5 is a cross-sectional view showing a lip seal according to embodiment 2.
Fig. 6 is a cross-sectional view showing a lip seal according to embodiment 3.
Fig. 7 is a cross-sectional view showing a lip seal according to the conventional example.
Description of the reference numerals
10. An EGR valve; 11. a housing; 13. a hollow hole; 16. a drive shaft (shaft member); 22. lip seals (sealing means); 30. a retaining ring; 31. a peripheral wall portion; 31b, a tapered face; 33. a bending portion; 34. an end wall portion; 40. a sealing lip; 41. a main body portion; 45. a lip; 47. a cover part.
Detailed Description
Embodiments for implementing the techniques disclosed in the present specification are described below using the drawings.
Embodiment 1
In the present embodiment, a lip seal as a seal device used for an EGR valve is exemplified. An EGR valve is a device for adjusting the flow rate of EGR gas in an exhaust gas recirculation device (EGR (Exhaust Gas Recirculation exhaust gas recirculation) device) for returning a part of the exhaust gas of an internal combustion engine, that is, a so-called engine, as EGR gas to an intake passage.
(outline of EGR valve)
Fig. 1 is a cross-sectional view showing an EGR valve, and fig. 2 is a cross-sectional view showing a peripheral portion of a lip seal. The vertical and horizontal directions of the EGR valve are defined with reference to fig. 1, but are not used to specify the arrangement direction of the EGR valve. As shown in fig. 1, the EGR valve 10 includes a housing 11 and an actuator 15. An inverted L-shaped gas passage 12 through which EGR gas flows is formed in the lower portion of the housing 11. An opening (a lower surface side opening in fig. 1) of the gas passage 12 serves as an EGR gas inlet 12a, and an opening (a side surface side opening in fig. 1) of the other side serves as an EGR gas outlet 12b. The housing 11 is made of a metal material, for example, an aluminum material. The EGR valve 10 is provided by attaching the housing 11 to an engine head of an engine by fastening or the like, for example.
A hollow hole 13 in the shape of a hollow cylinder is formed in the housing 11 so as to pass through the housing, and the hollow hole 13 is concentric with the inlet 12a of the gas passage 12. The hollow hole 13 is formed in a three-layer stepped hole shape, and has an upper hole portion 13a, a middle hole portion 13b, and a lower hole portion 13c, each having an inner diameter that increases stepwise from above to below. An annular valve seat 25 is disposed at the inlet 12a of the gas passage 12.
As shown in fig. 2, a cylindrical bearing bush 21 is fixedly fitted to the lower portion of the upper hole portion 13a. The bearing bush 21 is made of a metal material, for example, a copper material. A lip seal 22 is disposed in the middle hole portion 13 b. An annular deposition-preventing plug (japanese) 23 is fixedly fitted in the lower hole portion 13c of the hollow hole 13. The deposition preventing plug 23 is made of a metal material, for example, SUS material.
As shown in fig. 1, an actuator 15 is provided on the housing 11. The actuator 15 includes a drive shaft 16 that reciprocates in the axial direction (up-down direction in fig. 1). The actuator 15 includes an electric motor and a feed screw mechanism that converts rotational movement of the electric motor into linear movement of the drive shaft 16. The drive shaft 16 protrudes downward from the housing 17. The actuator 15 includes a cylindrical bearing bush 18 that supports the drive shaft 16 so as to be movable in the axial direction. The lower portion of the bearing bush 18 protrudes from the housing 17.
The case 17 is attached to the housing 11 by fastening or the like. The drive shaft 16 is inserted into the hollow hole 13 of the housing 11. The bearing bush 18 is fixedly fitted in the upper hole portion 13a of the hollow hole 13. The driving shaft 16 is made of a metal material, for example, SUS material. The bearing bush 18 is made of a metal material, for example, a copper material. The drive shaft 16 corresponds to a "shaft member" described in the present specification.
The drive shaft 16 penetrates the hollow portion of the bearing bush 21 of the housing 11. The drive shaft 16 is supported by a bearing bush 21 so as to be movable in the axial direction. The drive shaft 16 extends through the hollow of the lip seal 22. Leakage of EGR gas, foreign matter, moisture, and the like from the gas passage 12 to the actuator 15 side is suppressed by the lip seal 22. The lip seal 22 will be described later.
The drive shaft 16 penetrates the hollow portion of the deposition preventing plug 23 with a slight gap. The anti-deposit plug 23 serves to protect deposits that intrude from the gas passage 12 toward the lip seal 22 side.
The distal end portion (lower end portion) of the drive shaft 16 penetrates the hollow portion of the valve seat 25 with a predetermined gap therebetween. A conical valve body 27 having a hollow hole is attached to the tip end portion of the drive shaft 16. The valve body 27 moves together with the drive shaft 16 to open and close the gas passage 12. That is, the valve body 27 is moved downward from the valve-closed state shown in fig. 1 to open the gas passage 12, and is moved upward from the valve-open state to be seated on the valve seat 25 to close the gas passage 12. The drive shaft 16 doubles as the valve shaft of the EGR valve 10. A dedicated valve shaft may also be used for the drive shaft 16.
(lip seal 22)
The lip seal 22 is illustrated. As shown in fig. 2, the lip seal 22 includes: a retaining ring 30 made of a metal material, which is press-fitted into the middle hole portion 13b of the hollow hole 13 of the housing 11; and a seal lip 40 made of a rubber material, which is disposed inside the retaining ring 30. The metal material of the retainer ring 30 is SUS material such as SUS304, which has excellent corrosion resistance. The rubber material of the seal lip 40 is a fluororubber material such as PTFE (polytetrafluoroethylene) having excellent acid resistance. Fig. 3 is a cross-sectional view showing a lip seal, and fig. 4 is a cross-sectional view showing an IV portion of fig. 3.
As shown in fig. 3, the retainer ring 30 has a cylindrical peripheral wall 31. The lower end portion of the peripheral wall portion 31 extends to the lower end opening end in a cylindrical state. Therefore, a bent portion that is bent inward in the radial direction is not formed at the lower end portion of the peripheral wall portion 31. The peripheral wall 31 has an outer diameter larger than the inner diameter of the middle hole 13b (see fig. 2) of the hollow hole 13 of the housing 11 by an amount corresponding to a predetermined press-in amount. A tapered surface portion 31b having an outer diameter gradually decreasing toward the front (downward) is formed at the lower end portion of the outer peripheral surface 31a of the peripheral wall portion 31.
As shown in fig. 4, the tapered surface portion 31b has a predetermined taper angle θ with respect to the outer peripheral surface 31a of the peripheral wall portion 31. The minimum outer diameter of the tapered surface portion 31b is slightly smaller than the inner diameter of the middle hole portion 13b (see fig. 2) of the hollow hole 13 of the housing 11.
An annular plate-shaped end wall portion 34 is formed at the upper end of the peripheral wall portion 31, and is bent in an L-shaped cross section toward the radial direction inside via a bending portion 33. An R-face portion 33a having an arc-shaped cross section is formed on the outer side of the curved portion 33 over the entire circumference. The R face portion 33a has a predetermined radius of curvature. The minimum outer diameter of the R surface portion 33a is slightly smaller than the inner diameter of the middle hole portion 13b (see fig. 2) of the hollow hole 13 of the housing 11.
The seal lip 40 has an annular body portion 41. The main body 41 is formed in an annular shape having an inverted L-shaped cross section. The main body 41 includes a cylindrical portion 42 formed in a cylindrical shape and a circular annular plate-shaped flange portion 43 protruding radially inward from an upper end portion of the cylindrical portion 42. The inner peripheral surface of the cylindrical portion 42 is formed in a tapered shape in which the inner diameter gradually increases as going downward.
A lip 45 is formed at an inner peripheral end of the flange 43. The lip 45 is formed in a tapered cylindrical shape having a diameter gradually decreasing as going downward from the flange 43 side. The thickness of the lip 45 in the radial direction is substantially constant. In fig. 3 and 4, the lip 45 is shown in a free state.
The main body 41 is disposed in the retainer ring 30 in a fitting manner. A cover 47 having an inverted L-shaped cross section is formed at the inner peripheral end of the flange 43, and the cover 47 covers the inner peripheral end of the end wall 34 of the retainer ring 30. The interface between the main body 41 including the cover 47 and the retainer ring 30 is bonded by vulcanization adhesion. The inner peripheral side end of the flange 43 corresponds to a connection portion between the flange 43 and the lip 45.
(mounting of the lip seal 22 relative to the housing 11)
As shown in fig. 2, the lip seal 22 is attached to the housing 11 by pressing the retainer ring 30 into the middle hole portion 13b of the hollow hole 13 of the housing 11 from below. The drive shaft 16 is inserted into the hollow portion of the lip seal 22 by elastic deformation of the lip 45, so that the tip end portion of the lip 45 can slidably contact the outer peripheral surface of the drive shaft 16.
(advantage of embodiment 1)
According to the lip seal 22, the main body 41 of the seal lip 40 is joined to the peripheral wall 31 of the retainer ring 30, and the bent portion 33 is formed at one end (upper end) of the peripheral wall 31 of the retainer ring 30, but the bent portion bent inward in the radial direction is not formed at the other end (lower end) of the peripheral wall 31 of the retainer ring 30. Accordingly, the 2 nd curved portion 136 of the conventional lip seal 120 (see fig. 7) is reduced, and the durability of the retainer ring 30 can be improved. Further, the 2 nd bending portion 136 having a high internal stress can be reduced in the two bending portions 133 and 136 of the conventional lip seal 120 (see fig. 7).
A circular ring plate-shaped end wall portion 34 is formed at one end (upper end) of the peripheral wall portion 31 of the retainer ring 30, and is bent in an L-shaped cross section toward the radial direction inside via a bending portion 33. Accordingly, when the retainer ring 30 is pushed into the housing 11, the peripheral wall portion 31 is easily pushed into the hollow hole 13 of the housing 11 by the R surface portion 33a of the curved portion 33, and thus the push-in property of the retainer ring 30 can be improved.
A tapered surface portion 31b is formed at the other end portion (lower end portion) of the peripheral wall portion 31, the outer diameter of which gradually decreases as going forward. Accordingly, when the retainer ring 30 is pushed into the housing 11 with the retainer ring 30 turned upside down, the tapered surface portion 31b facilitates pushing the peripheral wall portion 31 into the hollow hole 13 of the housing 11, and thus the pushing-in property of the retainer ring 30 can be improved.
For example, when the outer diameter of the peripheral wall portion 31 of the retainer ring 30 is 11.0mm, the axial length is 3.7mm, and the press-fit amount of the retainer ring 30 into the middle hole portion 13b of the hollow hole 13 of the housing 11 is 0.16mm, the radius of curvature of the R surface portion 33a may be set to 1.2mm±0.2mm. This reduces the press-in load of the retainer ring 30 to the hollow hole 13 of the housing 11 and suppresses the occurrence of the seizing. In addition, the taper angle θ of the tapered face portion 31b may be set to 20+±5°. This reduces the press-in load of the retainer ring 30 to the hollow hole 13 of the housing 11 and suppresses the occurrence of the seizing.
A lid 47 is formed on the body 41 of the seal lip 40 to cover the inner peripheral end of the end wall 34 of the retainer ring 30. Thus, peeling of the body portion 41 of the seal lip 40 from the end wall portion 34 side of the retainer ring 30 can be suppressed.
In addition, the metal material of the retaining ring 30 is SUS material. Thus, corrosion of the retainer ring 30 can be suppressed by the corrosion resistance of the SUS material. This makes it possible to properly use the lip seal 22 in the exhaust gas condensation water environment. For example, the lip seal 22 for the EGR valve 10 used in the EGR device can be suitably used.
The lip seal 22 is attached to the housing 11 by pressing the peripheral wall portion 31 of the retainer ring 30 into the middle hole portion 13b of the hollow hole 13 of the housing 11. This suppresses accumulation of condensed water between the housing 11 and the peripheral wall 31, and can suppress corrosion of the housing 11 due to the condensed water.
The corrosion inhibiting effect of the housing 11 is supplemented. For example, there is a case where a rubber portion of the seal lip 40 is interposed between the housing 11 and the peripheral wall portion 31. In this case, condensed water is likely to accumulate between the housing 11 and the rubber portion, and the housing 11 is likely to corrode due to the condensed water. Since the rubber portion is deformed by the corrosion product generated by the corrosion, the gap between the housing 11 and the rubber portion increases, and the corrosion of the housing 11 by the condensed water continues. In contrast, according to the present embodiment, since the peripheral wall portion 31 of the retainer ring 30 is pressed into the hollow hole 13 of the housing 11, the rubber portion of the seal lip 40 is not interposed between the housing 11 and the peripheral wall portion 31. This can suppress accumulation of condensed water between the housing 11 and the peripheral wall 31, and suppress corrosion of the housing 11 due to the condensed water. Further, the engine cooling water temperature at the time of introducing the EGR gas is reduced, so that the frequency of use of the EGR gas can be increased.
Embodiment 2
In this embodiment, since the lip seal 22 of embodiment 1 is modified, the modification will be described, and the same reference numerals will be given to the same parts as those of embodiment 1, and redundant description will be omitted. Fig. 5 is a cross-sectional view showing a lip seal. As shown in fig. 5, in this embodiment, the cover 47 is omitted from the seal lip 40 of the lip seal 22 of embodiment 1.
Embodiment 3
In this embodiment, since the lip seal 22 of embodiment 2 is modified, the modification will be described, and the same reference numerals will be given to the same parts as those of embodiment 2, and redundant description will be omitted. Fig. 6 is a cross-sectional view showing a lip seal. As shown in fig. 6, in the present embodiment, the bent portion 33 and the end wall portion 34 are omitted from the retaining ring 30 of the lip seal 22 of embodiment 2. That is, the retainer ring 30 has a peripheral wall 31 in which a bent portion is not formed at both end portions, and is bent inward in the radial direction.
Further, a tapered surface portion 31b having an outer diameter gradually decreasing as going upward is formed at an upper end portion of the outer peripheral surface 31a of the peripheral wall portion 31. That is, tapered surface portions 31b are formed symmetrically in the upper and lower directions at both end portions of the outer peripheral surface 31a of the peripheral wall portion 31.
According to the present embodiment, the bent portions bent radially inward are not formed at the both end portions of the peripheral wall portion 31 of the retainer ring 30. Accordingly, the two curved portions 133 and 136 of the conventional lip seal 120 (see fig. 7) can be reduced, and the durability of the retainer ring 30 can be improved.
Further, the peripheral wall portion 31 of the retainer ring 30 can be pressed into the housing 11 from the side of any tapered surface portion 31b of the peripheral wall portion 31 of the retainer ring 30. Further, any one tapered face 31b of the two tapered face portions 31b may be omitted.
Other embodiments
The technology disclosed in the present specification is not limited to the above-described embodiments, and may be implemented in various other forms. For example, the lip seal 22 disclosed in the present specification can also be applied to a flow control valve other than the EGR valve 10, for example, a throttle valve. In addition, the drive shaft 16 of the EGR valve 10 is rotatable about an axis.
Claims (7)
1. A sealing device seals between a housing having a hollow hole and a shaft member inserted into the hollow hole, wherein,
the sealing device comprises:
a retaining ring made of a metal material, which is pressed into the hollow hole; and
a sealing lip made of a rubber material, which is disposed inside the retaining ring,
the seal lip has an annular main body portion and a lip portion capable of sliding contact with an outer peripheral surface of the shaft member,
the retaining ring has a circumferential wall portion which is cylindrical, has a circular annular plate-shaped end wall portion bent in an L-shaped cross section toward the radial direction inside via a bending portion at one end portion thereof, has no bending portion bent toward the radial direction inside at the other end portion thereof,
the main body is joined to the peripheral wall,
a cover portion is formed on the main body portion to cover an inner peripheral side end portion of the end wall portion, thereby suppressing the seal lip from being peeled off from the end wall portion when the lip portion is pressed against the shaft member.
2. The sealing device of claim 1, wherein,
a tapered surface portion is formed at the other end of the peripheral wall portion, the tapered surface portion gradually decreasing in outer diameter as going forward.
3. The sealing device of claim 1, wherein,
the metal material of the retaining ring is SUS material.
4. The sealing device of claim 2, wherein,
the metal material of the retaining ring is SUS material.
5. The sealing device according to any one of claims 1 to 4, wherein,
the main body portion has a cylindrical portion formed in a cylindrical shape and a circular ring-plate-shaped flange portion protruding radially inward from an upper end portion of the cylindrical portion, and the peripheral wall portion is joined to the cylindrical portion.
6. The sealing device according to any one of claims 1 to 4, wherein,
the thickness of the lip portion in the radial direction is substantially constant.
7. The sealing device of claim 5, wherein,
the thickness of the lip portion in the radial direction is substantially constant.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-081755 | 2019-04-23 | ||
| JP2019081755A JP2020180622A (en) | 2019-04-23 | 2019-04-23 | Seal device |
| CN202010327151.3A CN111828638B (en) | 2019-04-23 | 2020-04-23 | Sealing device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010327151.3A Division CN111828638B (en) | 2019-04-23 | 2020-04-23 | Sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116576297A true CN116576297A (en) | 2023-08-11 |
Family
ID=72914004
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310467386.6A Pending CN116576297A (en) | 2019-04-23 | 2020-04-23 | Sealing device |
| CN202010327151.3A Active CN111828638B (en) | 2019-04-23 | 2020-04-23 | Sealing device |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010327151.3A Active CN111828638B (en) | 2019-04-23 | 2020-04-23 | Sealing device |
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| CN (2) | CN116576297A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2023069174A (en) * | 2021-11-05 | 2023-05-18 | 愛三工業株式会社 | EGR valve |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60114372U (en) * | 1984-01-12 | 1985-08-02 | エヌオーケー株式会社 | oil seal |
| JPS6323070A (en) * | 1986-06-19 | 1988-01-30 | Arai Pump Mfg Co Ltd | Oil seal of outer peripheral metal fitting type |
| JPH01154367U (en) * | 1988-04-15 | 1989-10-24 | ||
| JP2007270873A (en) * | 2006-03-30 | 2007-10-18 | Jtekt Corp | Sealing device |
| JP2010144827A (en) * | 2008-12-18 | 2010-07-01 | Toyota Motor Corp | Oil seal press fitting structure |
| DE102009028131A1 (en) * | 2009-07-30 | 2011-02-03 | Trelleborg Sealing Solutions Germany Gmbh | Seal and seal arrangement |
| JP5598049B2 (en) * | 2010-03-26 | 2014-10-01 | Ｎｏｋ株式会社 | Manufacturing method of sealing member |
| JP5459501B2 (en) * | 2010-05-25 | 2014-04-02 | Ｎｏｋ株式会社 | Sealing device |
| CN201992072U (en) * | 2011-02-25 | 2011-09-28 | 青岛开世密封工业有限公司 | Narrow-edge framework oil seal |
| CN202125607U (en) * | 2011-03-19 | 2012-01-25 | 青岛开世密封工业有限公司 | Oil seal |
| CN102875858B (en) * | 2012-09-26 | 2014-04-30 | 广州机械科学研究院有限公司 | Lip-type seal ring framework material for rotary shaft, as well as preparation method and application of lip-type seal ring framework material |
| CN203421175U (en) * | 2013-08-28 | 2014-02-05 | 湖北新置密封件有限公司 | Split oil seal |
| JP6880827B2 (en) * | 2017-02-28 | 2021-06-02 | 日本精工株式会社 | Seal ring and its manufacturing method |
| CN208268406U (en) * | 2018-05-17 | 2018-12-21 | 昆山健博密封件科技有限公司 | A kind of list lip outside framework oil seal |
-
2019
- 2019-04-23 JP JP2019081755A patent/JP2020180622A/en active Pending
-
2020
- 2020-04-23 CN CN202310467386.6A patent/CN116576297A/en active Pending
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| CN111828638B (en) | 2023-05-02 |
| CN111828638A (en) | 2020-10-27 |
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