CN101550888B - Oil seal for internal combustion engine - Google Patents
Oil seal for internal combustion engine Download PDFInfo
- Publication number
- CN101550888B CN101550888B CN2009100839966A CN200910083996A CN101550888B CN 101550888 B CN101550888 B CN 101550888B CN 2009100839966 A CN2009100839966 A CN 2009100839966A CN 200910083996 A CN200910083996 A CN 200910083996A CN 101550888 B CN101550888 B CN 101550888B
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- Prior art keywords
- lip
- oil seal
- oil
- combustion engine
- internal combustion
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 22
- 238000007789 sealing Methods 0.000 claims abstract description 86
- 239000000463 material Substances 0.000 claims abstract description 19
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 15
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 15
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 11
- 150000001875 compounds Chemical class 0.000 claims description 13
- 229920001971 elastomer Polymers 0.000 claims description 13
- 239000005060 rubber Substances 0.000 claims description 12
- 239000004033 plastic Substances 0.000 claims description 9
- 229920003023 plastic Polymers 0.000 claims description 9
- 239000004809 Teflon Substances 0.000 claims description 3
- 229920006362 Teflon® Polymers 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 229920006351 engineering plastic Polymers 0.000 claims description 2
- 239000012530 fluid Substances 0.000 abstract description 11
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- 239000002253 acid Substances 0.000 abstract description 5
- 239000002131 composite material Substances 0.000 abstract description 3
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- 238000003754 machining Methods 0.000 abstract description 2
- 239000003513 alkali Substances 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 230000010354 integration Effects 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 241000283216 Phocidae Species 0.000 description 11
- 230000000694 effects Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 7
- 238000005461 lubrication Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 229910000975 Carbon steel Inorganic materials 0.000 description 4
- 150000007513 acids Chemical class 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 239000010962 carbon steel Substances 0.000 description 4
- 230000003116 impacting effect Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010425 asbestos Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052895 riebeckite Inorganic materials 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
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- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
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- 238000012856 packing Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
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- 239000004411 aluminium 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
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- 229920002493 poly(chlorotrifluoroethylene) Polymers 0.000 description 1
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- Sealing With Elastic Sealing Lips (AREA)
Abstract
The present invention provides an oil seal for internal combustion engine includes an oil seal lip, a positioning bracket permanent connected with end of the oil seal lip, and a mounting guide sleeve;the lip of the oil seal lip that contacts with the surface of a shaft is composited with polytetrafluoroethylene layer for forming composite lip, the mounting guide sleeve shapes like an annular horn or a cap with hole and matches with the lip transitionally. The oil seal for internal combustion engine uses oil seal lip permanent connected with the positioning bracket to form an integration, whic h can reduce impact of machining error and manpower error on assembly; use the composite lip of the polytetrafluoroethylene paste lip as lip materials, which is provided with advantages of small friction coefficient and long service life, extreme high low temperature resistant, chemical acid and alkali corrosion resistant and favourable lip elastic and follow-up character; simultaneity mounted with guide sleeve for guiding the oil seal mounted to the shaft and being capable of preventing the lip scratched by bur. The internal combustion engine of the invention can be widely used in mechanical sealing separation of various positioning bracket and case body loaded with sealing fluid.
Description
Technical field
The present invention relates to a kind of oil sealing, be specifically related to a kind of oil seal for internal combustion engine.
Background technique
Oil sealing (oil seal) is the custom appellation of general Sealing, briefly is exactly the sealing of lubricant oil.As its name suggests: oil sealing is to be used for the mechanical component of oil sealing (oil is modal liquid substance in the transmission system, also makes a general reference general liquid substance), and it isolates the parts that need in the transmission part to lubricate and the parts of exerting oneself, and is unlikely to allow oil seepage.
Can be divided into various ways and different calls from seal action, characteristics, structure type, working state and the sealing mechanism etc. of oil sealing, but traditionally generally with rotary shaft lip seal on oil sealing, also there are a lot of reciprocating lip-type packings in society on oil sealing now.Static seal and motive sealing (general to-and-fro motion) with Sealing Sealing.
The sealing of oil sealing is to form by the interference fit between a flexible seal (leather, rubber, teflon, polychlorotrifluoroethylene or polyimide etc.) and the running shaft.Its sealing mechanism is: simultaneously and deposit dry friction, boundary lubrication and three kinds of situations of fluid lubrication, do not break off a friendship for producing on the contact surface between oil sealing lip and the axle.Dry friction produces wearing and tearing, and fluid lubrication produces and leaks, and under boundary lubrication, forms the stable hydrodynamic oil film of one deck, the about 0.0025mm of oil slick thickness between the interface of oil sealing lip and axle; This layer oil film also seals except that as lubricated.Oil film is too thick, and fluid will leak; Oil film is too thin, just can not form the fluid lubrication film, and lip will wear and tear.Therefore, in order to obtain excellent sealing performance and long operating life, will ask for help on structural design, rubber compounding design and installation are used, all to provide condition for forming thin stabilized uniform borderline oil film.
Oil sealing at first produces prototype in Germany from nineteen twenty-seven, now be widely used in the parts such as motor, gearbox, ransaxle of engineering machinery, as the bent axle front and rear oil seals of motor, the front and back output shaft of gearbox, the main reducing gear of ransaxle, wheel limit etc. are located, its function is an oil pocket and extraneous the isolation, internally oil sealing, externally dustproof.The oil seal structure pattern of domestic a large amount of employings at present is many, and its basic structure comprises rubber seal part (lip), skeleton/housing and spring.
The effect of lip be at the lip place by the last item surface, play fluid-encapsulated effect.Material adopts ox-hide, NBR, HNBR, ACM, AEM, FKM, FPM, VMQ, SBR, EPDM, felt, PTFE and PTFE+ rubber+felt combination etc. more.Framework material adopts carbon steel, stainless steel, aluminium, copper or plastics etc. more; In the time of in oil sealing is fixed on cavity, skeleton works to support and keep external diameter coordinate force.Spring has another name called packing ring, can improve the impacting force of lip to axle, and keeps the effect of this impacting force; Material generally adopts carbon steel, stainless steel, plastics etc.
Oil sealing can be divided into various ways and different calls by seal action, characteristics, structure type, working state and sealing mechanism etc.Oil sealing is just classified by the roulette speed of axle, and oil sealing can be divided into low speed oil sealing (less than 6m/s) and high-speed oil seal (greater than 6m/s).Just classify by the pressure that oil sealing can bear, can be divided into normal pressure type oil sealing and pressure resistant type (greater than 0.05Mpa) oil sealing.Press the structure and the sealing principle classification of oil sealing, can be divided into standard type oil sealing and power reflow type oil sealing.In addition, by constituting the classification of Oil sealing assembly material, can being divided into again matrix type oil sealing and exoskeletal type oil sealing are arranged; Spring type oil sealing and no spring type oil sealing are arranged.
But present various types of oil sealing is some self deficiency all, such as, for the lip material, the rubber lip good springiness, servo-actuated is good, but temperature tolerance, weatherability, resistance to acids and bases are poor, and friction factor is big, and easily high temperature ageing is afraid of to scratch; The ox-hide lip is better, because of the material restriction, and industrialization for a long time on a large scale; PTFE lip temperature tolerance, weather resisteant, resistance to acids and bases are good, and friction factor is little, long service life, but poor flexibility, and servo-actuated is poor, is afraid of to scratch.And oil sealing is very accurate parts, and is also excessive to the friction of lip if the surface roughness of installation shaft is too high, also is very easy to scratch lip in the process of installing, and causes leakage.
For the cavity locating support, positioning hole and shaft concentricity are relatively poor, and oil sealing is positioned on easy deformation in the positioning hole, inclination, thereby cause leakage.
For locating support and the casing that will install, adopt asbestos, graphite, non-asbestos washer to seal between the two usually, the soft flocks that has the pad inboard like this enters fluid, thus contaminated-fluid, asbestos, also not environmental protection of graphite simultaneously.
Summary of the invention
The objective of the invention is to address the above problem, provide a kind of locating support and lip structure-integrated, and adopt the oil seal for internal combustion engine of compound lip.
In order to realize purpose of the present invention, technological scheme of the present invention is:
A kind of oil seal for internal combustion engine, it comprises oil sealing lip, the locating support of fixedlying connected with the tail end of oil sealing lip, and mounting guide sleeve; Described oil sealing lip is compounded with polytetrafluoroethylene floor with the surperficial contacted lip of axle, forms compound lip, and described mounting guide sleeve is loudspeaker or lid shape with holes in the form of a ring, with described lip transition fit mutually.
Wherein, described lip is the wedge shape.After oil sealing was installed to axle, lip was pressed the last item surface, played fluid-encapsulated effect.
Described oil sealing lip is single lip or multiple lip type.
When the oil sealing lip was single lip, the oil sealing lip was main lip, comprised that mainly lip, lip have two-way inclination angle A, B, and main lip waist has inclination angle C and has the thickness L and the R value of variation.Can be the normal shape that adopts in related domain.
When the oil sealing lip is multiple lip type, just except that main lip, also comprise one or more secondary lip, main lip closely links to each other with the axle surface respectively with secondary lip, forms the multiple tracks protection, and described secondary lip can be used for preventing that sand, dirt are to invading in the lubricant oil in the axle.Secondary lip can with material be rubber or felt, engineering plastics, teflon paster.
Described lip can adopt rubber or plastic material.
Described oil seal for internal combustion engine also comprises a spring, is arranged in the spring groove of described oil sealing lip, to improve impacting force and the servo-actuated of lip to axle.Described spring can adopt materials such as carbon steel, stainless steel or plastics.
Described compound lip surface also is provided with the oil return line, and in the time of can allowing the axle rotation, internal flow forms a kind of pumping effect with barometric pressure outside compound lip, fluid is pushed back in the chamber.When static, by the surface tension formation leakproof of liquid thickness.Thereby reduce dry grinding to the full extent, increase oil sealing working life.According to the working forms of oil sealing difference, the oil return line can be unidirectional, two-way, wave, circle round or various ways such as intersection.
Described locating support is provided with the sealing tree lace, can between locating support and the casing that will install, play effective seal effect, described locating support generally according to the casing requirement, can have any shape, and guarantees to match with the fluid-encapsulated casing of loading to get final product.Described locating support can adopt metal, plastics or both joining materials.
Described mounting guide sleeve adopts metal, plastics or both joining materials to make.
Oil seal for internal combustion engine of the present invention has the following advantages:
1. because the parallelism of the fitting plane of existing locating support and cavity and body is bad, cause oil seal lip effectively not work perpendicular to axle, and there is deviation at the cavity center of the pilot hole position of locating support and oil sealing, also can cause oil sealing and axle decentraction, therefore the present invention adopts described lip structure to fixedly connected with described locating support to be integral, can to reduce the influence to assembling of machining error and human error;
2. described compound lip by polytetrafluoroethylene (PTFE) subsides lip had both had the rubber lip good springiness, the advantage that servo-actuated is good, it is good to have PTFE lip temperature tolerance, weather resisteant, resistance to acids and bases again, friction factor is little, and the advantage of long service life is optimal lip material;
3. if Zhou assembling chamfering science or jagged then can damage the lip material not directly causes leakage, therefore, the present invention is provided with mounting guide sleeve, and it plays the effect that the guiding oil sealing is installed to axle, can prevent that fully lip from being scratched by the axle burr;
4. the present invention replaces common liner with the sealing tree lace on the locating support, and having overcome the liner section can be because of the deficiency of punching press burr and long work loss contaminated-fluid;
5. oil seal for internal combustion engine of the present invention is widely used in various locating supports and loads the mechanical seal that fluid-encapsulated casing separates.
Description of drawings
Fig. 1 is an oil seal for internal combustion engine master TV structure schematic representation of the present invention;
Fig. 2 is the local sectional structure schematic representation that amplifies of the A-O-A of Fig. 1;
Fig. 3 is the partial enlarged drawing of main lip 9 among Fig. 2;
Fig. 4 is oil seal for internal combustion engine of the present invention and axle cooperating structure schematic representation.
Among the figure:
12 mounting guide sleeve 3 locating supports
4 sealing tree laces, 5 oil sealing lips, 6 springs
7 spring grooves, 8 oil sealing lip tail ends, 9 main lips
10 main lip 11 polytetrafluoroethylene floors 12 oil return lines
13 main lip waist 14 secondary lips 15 are installed and positioning hole
C master's lip waist inclination angle, the two-way inclination angle of A, B R value
L waist thickness changing value
Embodiment
Following examples are used to illustrate the present invention, but are not used for limiting protection scope of the present invention.
Fig. 1 is an oil seal for internal combustion engine master TV structure schematic representation of the present invention; Fig. 2 is the local sectional structure schematic representation that amplifies of the A-O-A of Fig. 1; As shown in Figure 1, 2, oil seal for internal combustion engine of the present invention, it comprises oil sealing lip 5, the locating support 3 and the mounting bracket 2 of fixedlying connected with the tail end 8 of oil sealing lip 5.
Locating support 3 also is provided with to be installed and positioning hole 15 (6) totally, and it is used for oil sealing is installed to outside the fluid-encapsulated casing of loading.
Oil sealing mounting bracket 3 also has a lot of new effects, directly seal oil such as the locating support internal diameter with the axle interference fit, external diameter and oil seal lip interference fit are carried out work, are equivalent to axle has been added a lining, prevent the wearing and tearing to axle of the lip that causes because of working long hours; Simultaneously, also can have the grid of a circle five equilibrium on the locating support, be used for sensor reading, computer calculates rotating speed etc.
Two-way inclination angle A, B are used for balance internal flow and extraneous pressure contrast, reach internal and external equilibrium by design.
The elasticity and the pressure of waist inclination angle C and waist thickness changing value L and R value may command master lip, main lip is a sealing elastomer, be designed to still can keep stable seal action under the influence to the vibration of machinery and fluid-encapsulated pressure oscillation, and play an effect that keeps main lip and axle surface-stable contact condition.
Be compounded with polytetrafluoroethylene floor 11 with the contacted main lip 10 in axle surface, form compound lip.Main lip 10 is the wedge shape, is made by rubber material.Compound lip had both had the rubber lip good springiness, the advantage that servo-actuated is good, and it is good to have PTFE lip temperature tolerance, weather resisteant, resistance to acids and bases again, and friction factor is little, and the advantage of long service life is optimal lip material.After oil sealing was installed to axle, compound lip was pressed the last item surface, played fluid-encapsulated effect.
Spring 6 is installed, to improve impacting force and the servo-actuated of lip in the spring groove 7 to axle.Spring 6 adopts materials such as carbon steel, stainless steel or plastics.
Be provided with oil return line 12 on compound lip surface, promptly on the surface of polytetrafluoroethylene floor 11, the oil return line is according to different working forms, can adopt existing unidirectional, two-way, wave, circle round or various ways such as intersection.During the axle rotation, internal flow forms a kind of pumping effect with barometric pressure outside compound lip, fluid is pushed back in the chamber.When static, by the surface tension formation leakproof of liquid thickness.Thereby reduce dry grinding to the full extent, increase oil sealing working life.
Locating support 3 is provided with sealing tree lace 4, to play better seal action.Locating support 3 can have any shape according to the casing requirement, guarantees to match and get final product with loading fluid-encapsulated casing, is made by metal, plastics or the two composite, seals tree lace 4 and is made by rubber.Locating support works to prevent that fluid from leaking and invading from the surface of contact of the oil sealing outside with the cavity inboard.
Because the casing that needs now to seal often has a plurality of end faces that axle work is arranged simultaneously, need end face seal simultaneously, so sealing tree lace 4 can be according to the assembling needs, appear on one or more mating faces, can be that a circle ring closes, also can be that a circle does not encircle and closes, compound lip also can appear on the one or more working surfaces as required simultaneously.
Oil seal for internal combustion engine of the present invention can be according to seal request, and axle is different with the working method in chamber, adjusts structure, and secondary lip, spring and oil return line can omit, and also can carry out combination in any and use.
When preparing oil seal for internal combustion engine of the present invention, locating support 3 adopts a mold (punching press or injection moulding) integral body to process earlier, adopt a mold to synthesize (sealing tree lace 4 can't can adopt post forming during once-through) with oil sealing lip 5 and sealing tree lace 4 locating support 3 that processes again, spring 6 is installed in the spring groove 7, the mounting guide sleeve 2 and the oil sealing lip 5 that will process separately at last make up again.
When oil seal for internal combustion engine of the present invention used in assembling, the oil sealing that will have mounting guide sleeve 2 was according to correct mounting type, and cover installs on the axle 1, owing to have mounting guide sleeve, can guide oil sealing to install to axle easily, installs very convenient; After being in place, mounting guide sleeve is extracted out from oil sealing, at this moment, the main lip 10 of oil sealing and secondary lip 14 tightly are fitted on the axial wall again, and as shown in Figure 4, the whole erection process can prevent that fully lip from being scratched by the axle burr.
Though above the present invention is described in detail with a general description of the specific embodiments, on basis of the present invention, can make some modifications or improvements it, this will be apparent to those skilled in the art.Therefore, these modifications or improvements all belong to the scope of protection of present invention without departing from theon the basis of the spirit of the present invention.
Claims (4)
1. oil seal for internal combustion engine, it comprises oil sealing lip, the locating support of fixedlying connected with the tail end of oil sealing lip, and mounting guide sleeve; Described oil sealing lip is made up of main lip and secondary lip, described main lip closely is connected with the axle surface respectively with secondary lip, described main lip is made up of main lip, two-way inclination angle A, B, oil return line, main lip waist inclination angle C and waist thickness changing value L and spring groove, be compounded with polytetrafluoroethylene floor with the contacted main lip in axle surface, form compound lip, described main lip is the wedge shape, be provided with spring in the described spring groove, described mounting guide sleeve is loudspeaker ring-type or lid shape with holes, with described main lip transition fit mutually, described locating support is provided with the sealing tree lace.
2. oil seal for internal combustion engine according to claim 1 is characterized in that the material of described secondary lip is rubber, felt, engineering plastics or teflon paster.
3. oil seal for internal combustion engine according to claim 1 is characterized in that, the form that described oil return line is unidirectional, two-way, wave, circle round or intersect.
4. oil seal for internal combustion engine according to claim 1 is characterized in that described main lip is rubber or plastic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100839966A CN101550888B (en) | 2009-05-15 | 2009-05-15 | Oil seal for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100839966A CN101550888B (en) | 2009-05-15 | 2009-05-15 | Oil seal for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101550888A CN101550888A (en) | 2009-10-07 |
| CN101550888B true CN101550888B (en) | 2011-01-12 |
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ID=41155328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100839966A Active CN101550888B (en) | 2009-05-15 | 2009-05-15 | Oil seal for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101550888B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI551503B (en) * | 2014-01-28 | 2016-10-01 | Qing-Guo Zeng | Variable speed bike |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9726300B2 (en) * | 2014-11-25 | 2017-08-08 | Baker Hughes Incorporated | Self-lubricating flexible carbon composite seal |
-
2009
- 2009-05-15 CN CN2009100839966A patent/CN101550888B/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI551503B (en) * | 2014-01-28 | 2016-10-01 | Qing-Guo Zeng | Variable speed bike |
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| Publication number | Publication date |
|---|---|
| CN101550888A (en) | 2009-10-07 |
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Effective date of registration: 20160412 Address after: 313009 Nanxun City, Zhejiang province Nanxun Town, Jin Jiajin village, prosperous village, Patentee after: Zhejiang Chi Chi Oil Technology Co., Ltd. Address before: 102413, No. 305, building 22, pool road, Fangshan District new town, Beijing Patentee before: Dong Bo |
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Effective date of registration: 20191111 Address after: Nanxun town Xinglong Village, Nanxun District, Huzhou City, Zhejiang Province Patentee after: Huzhou Yongchi rubber plastic products Co., Ltd Address before: 313009 Nanxun City, Zhejiang province Nanxun Town, Jin Jiajin village, prosperous village, Patentee before: Zhejiang Chi Chi Oil Technology Co., Ltd. |