CN112728091A - Power oil return oil seal for inner packing framework of helicopter speed reducer - Google Patents
Power oil return oil seal for inner packing framework of helicopter speed reducer Download PDFInfo
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- CN112728091A CN112728091A CN202011556899.7A CN202011556899A CN112728091A CN 112728091 A CN112728091 A CN 112728091A CN 202011556899 A CN202011556899 A CN 202011556899A CN 112728091 A CN112728091 A CN 112728091A
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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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3208—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings
- F16J15/3212—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings with metal springs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/0053—Producing sealings
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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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/029—Gearboxes; Mounting gearing therein characterised by means for sealing the gearboxes, e.g. to improve airtightness
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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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
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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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/324—Arrangements for lubrication or cooling of the sealing itself
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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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
- F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
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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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing With Elastic Sealing Lips (AREA)
Abstract
The invention relates to a power oil return oil seal for an inner package framework of a helicopter speed reducer, which comprises a reinforced metal framework, a tightening spring and a rubber sealing body, wherein the reinforced metal framework is provided with a plurality of reinforcing ribs; the reinforced metal framework is of an annular structure, the cross section of the reinforced metal framework is in an L shape, and the reinforced metal framework comprises a horizontal section and a vertical section which are integrally formed; the rubber sealing body comprises a main sealing lip body and outer rubber, the annular main sealing lip body is arranged in the upward direction of the horizontal section, a spring groove is formed in the outer wall of the main sealing lip body, and a tightening spring is arranged in the spring groove; wrapping rubber outside the vertical section and the horizontal section; the main sealing lip body comprises a dust-proof auxiliary lip, an oil seal waist part and a lip crown part from bottom to top; the inboard of lip crown sets up the lip, and the lip upside is lip anterior angle, and the lip downside is the lip relief angle, forms the working face at the lip relief angle, and the mould pressing shaping round power returns the oil line on the working face. The oil seal has more reliable sealing performance and longer service life, and simultaneously has the advantages of strong working condition adaptability, environmental vibration resistance and wide use temperature range.
Description
Technical Field
The invention belongs to the technical field of rubber rotary shaft lip seal, and particularly relates to a power oil return seal for an inner wrapping framework of a helicopter speed reducer.
Background
The transmission system is one of four main systems of a helicopter, and the speed reducer is an important component of the transmission system and can be divided into a main speed reducer, a middle speed reducer and a tail speed reducer. Along with the development of helicopters towards the directions of high maneuverability, reliability, long service life and easy maintenance, the transmission system oil seal is required to have good sealing performance and long service life under the conditions of high rotating speed, complex working conditions with large environmental vibration, large bounce quantity and extreme environments. In the existing military helicopters with various models, because the oil seal structure of part of the speed reducer is unreasonable, the military helicopters cannot adapt to the use working condition well, the problem of lubricating oil leakage in a long time (such as 100 hours) of flight exists, the lubricating oil level is reduced even due to individual leakage, the oil seal needs to be replaced on site, the maintenance cost is increased, and the execution of flight tasks is seriously influenced. Therefore, the oil seal for the speed reducer with high performance and long service life and good working condition adaptability is urgently needed to be developed so as to meet the requirements of technical and tactical indexes of the military helicopter at present.
The dynamic oil return (backflow) oil seal is a brand new oil seal structure form developed in the seventh and eighties of the last century according to the micro pump theory, and has an efficient oil return function because leaked lubricating oil can be scraped back to an oil return cavity again, so that an oil seal lip is always in a dynamic lubrication state, dry friction is avoided, the service life and the sealing reliability of the oil seal are greatly improved, and the oil seal is rapidly and widely used. And a variable-section oil return line structure is derived in the later stage, and compared with a common uniform-section oil return oil seal, the variable-section oil return line structure has a more efficient oil return function. However, the advanced oil seal structure form is not applied to the field of the whole helicopter speed reducer in a mature way due to the complexity and diversity of the working conditions of the helicopter, and the application part of an individual helicopter does not achieve due effect due to the fact that the oil seal structure is not matched with the working conditions, so that the popularization and the application of the power oil return (backflow) oil seal are influenced.
Disclosure of Invention
The invention provides a power oil return oil seal for an inner package framework of a helicopter speed reducer, which solves the problems of poor working condition adaptability, low sealing reliability and short service life of a common oil seal with a smooth working surface in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the dynamic oil return oil seal of the inner package framework of the helicopter speed reducer comprises a reinforced metal framework, a tightening spring and a rubber sealing body; the reinforced metal framework is of an annular structure, the cross section of the reinforced metal framework is in an L shape, and the reinforced metal framework comprises a horizontal section and a vertical section which are integrally formed; the rubber sealing body comprises a main sealing lip body and outer packing rubber, the annular main sealing lip body is arranged in the upward direction of the horizontal section, a spring groove is formed in the outer wall of the main sealing lip body, and the tightening spring is arranged in the spring groove; wrapping rubber outside the vertical section and the horizontal section;
the main sealing lip body comprises a dust-proof auxiliary lip, an oil seal waist part and a lip crown part from bottom to top; the inner side of the lip crown part is provided with a lip opening, the upper side of the lip opening is a front lip angle, the lower side of the lip opening is a rear lip angle, a working surface is formed at the rear lip angle, a circle of power oil return line is molded on the working surface, and the power oil return line is a triangular convex edge with an included angle of 23-32 degrees with a horizontal line.
Further, the waist part of the oil seal is of a vertical structure or an inclined structure.
Further, the angle range of the front lip angle is 40-45 degrees, and the angle range of the back lip angle is 20-30 degrees.
Furthermore, the structural form of the power oil return line comprises a common uniform-section oil return line and a variable-section oil return line; the size of the triangular convex edge of the common uniform-section oil return line at the lip opening is consistent with that of the tail section, and the triangular convex edge is of an isosceles right triangle structure; the size of the triangular convex edge of the variable cross-section oil return line at the lip mouth is different from that of the tail section, and the triangular convex edge is similar to an isosceles right triangle.
Furthermore, the rubber sealing body is made of fluororubber.
Furthermore, the material of the tightening spring is a carbon spring steel wire or a stainless steel spring steel wire.
Furthermore, the metal framework is made of stainless steel or 08F cold rolled steel.
Compared with the prior art, the invention has the following beneficial effects:
according to the inner-package framework power oil return seal for the helicopter speed reducer, the fluororubber with excellent medium resistance, high temperature resistance and wear resistance is used as a main material, a circle of isosceles right-angle triangular convex edge with an included angle of 23-32 degrees with a horizontal line is formed by compression molding on the working surface (air side) of the oil seal, leaked lubricating oil can be scraped back to an oil return cavity again, the oil return seal has an efficient oil return function, the lip mouth of the oil seal is always in a dynamic lubrication state, dry friction is avoided, the service life and the sealing reliability of the oil seal are greatly improved, and the problems that in the prior art, a common oil seal with a smooth working surface is poor in working condition adaptability, low in sealing reliability and short in service life are solved, so that the oil seal has more reliable sealing performance and longer service life (2000 h), and meanwhile, the oil seal also has strong working condition adaptability (the shaft speed is 260 r/min-18000, The high-speed runout of the shaft is less than or equal to +/-0.15 mm, the low-speed swinging quantity of the shaft is less than or equal to +/-0.5 mm), the environmental vibration is resisted, and the use temperature range is wide (-45 ℃ to +150 ℃).
Drawings
FIG. 1 is a schematic structural view of example 1 of the present invention;
FIG. 2 is a schematic structural diagram of example 2 of the present invention;
FIG. 3 is a schematic view of a conventional left-handed regular cross-section oil return line according to the present invention;
FIG. 4 is a schematic view of a right-handed variable cross-section power return line configuration of the present invention;
FIG. 5 is a schematic view of the reinforced metal framework of the present invention;
FIG. 6 is a schematic structural view of a garter spring according to the present invention;
in the figure, 1-reinforced metal framework, 2-hoop spring, 3-main sealing lip body, 4-rubber coating, 5-dustproof auxiliary lip, 6-oil sealing waist, 7-lip crown, 8-lip and 9-power oil return line.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following examples. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
The invention relates to a power oil return seal of an inner package framework of a helicopter speed reducer, which can also be called as a lip-shaped seal ring of a power return rotating shaft of the inner package framework of the helicopter speed reducer. The invention relates to a rubber seal which uses fluororubber with excellent medium resistance, high temperature resistance and wear resistance as a main material, wherein a circle of isosceles right triangle bead with an included angle of 23-32 degrees with the horizontal line is formed by compression molding on the working surface (air side) of a main seal lip body, namely a power oil return line, when a shaft rotates to work, a little lubricating oil seeped from the lip of the oil seal can be scraped to the oil side by the bead immediately, so that the lip is always in a good dynamic lubrication state, and the oil seal has more reliable sealing performance and longer service life.
The invention divides the power oil return line into two types of clockwise and counterclockwise (or left-handed and right-handed), namely, the power oil return line has directionality according to the rotating direction of the shaft, and if the power oil return line is reversely installed, the power oil return line not only cannot play a sealing role, but also can cause more serious leakage.
The invention is divided into three types of typical uses according to the working condition of the shaft: high-rotation-speed oil seal, large-swing oil seal and complex-working-condition oil seal. The application temperature range is (-45-200) DEG C, and the sealing medium: lubricating Oil DOD-PRF-85734A (lubricating Oil brand: Aerosell Turbo Oil 555) or Feimal II lubricating Oil. Mounting positions: the main speed reducer, the middle speed reducer and the tail speed reducer of the helicopter. The sealing device has the advantages of strong working condition adaptability, high sealing reliability and long service life, and simultaneously has the vibration resistance.
Example 1:
the power oil return oil seal of the internal package framework of the helicopter speed reducer shown in the figures 1, 5 and 6 comprises a reinforced metal framework 1, a tightening spring 2 and a rubber sealing body; the reinforced metal framework 1 is of an annular structure, the cross section of the reinforced metal framework is in an L shape, and the reinforced metal framework comprises a horizontal section and a vertical section which are integrally formed; the rubber sealing body comprises a main sealing lip body 3 and an outer wrapping rubber 4, the annular main sealing lip body 3 is arranged in the upward direction of the horizontal section, the outer wall of the main sealing lip body 3 is provided with a spring groove, and the tightening spring 2 is arranged in the spring groove; the vertical section and the horizontal section are coated with outer packing rubber 4;
the main sealing lip body 3 comprises a dust prevention auxiliary lip 5, an oil seal waist part 6 and a lip crown part 7 from bottom to top; the inboard of lip crown portion 7 sets up lip 8, and 8 upsides of lip are lip anterior angles, and 8 downsides of lip are lip relief angles, form the working face at the lip relief angle, set up power oil return line 9 on the working face, and oil return line 9 divides two kinds of (or levogyration, dextrorotation) forms clockwise, anticlockwise according to the direction of rotation of axle.
In the embodiment, the oil seal waist 6 is of a vertical structure, namely the inclination angle (included angle with a vertical line) of the straight waist type oil seal waist is smaller than that of the working surface of the lip crown part, the straight waist type oil seal waist and the lip crown part are connected through a fillet, the waist is relatively vertical, the thickness (narrowest part) of the waist is 0.7-1.5 mm, and the length is 0.2-2.0 mm; the oil seal is suitable for working conditions of high rotating speed and large jumping quantity.
The relevant parameters of the main sealing lip body 3 are as follows: the inclined angle range of the front lip angle is 40-45 degrees, the inclined angle range of the rear lip angle is 20-30 degrees, the radius of the spring groove is 0.8-1.2 mm, the R value is 0.2-0.6 mm, and the a value is 2.6-4.5 mm.
Referring to fig. 3 and 4, the oil return line 9 has a structure including a common uniform cross-section oil return line and a variable cross-section oil return line; fig. 3 shows a left-handed general uniform cross-section oil return line structure (right-handed same principle, not shown), and fig. 4 shows a right-handed variable cross-section power oil return line structure (left-handed same principle, not shown).
The structural parameters are as follows:
the common uniform-section oil return line convex edge is consistent with the tail section in size at the lip and is in the shape of an isosceles right triangle, the height of the bottom edge is 0.10 +/-0.02 mm, and the width of the bottom edge is 0.20 +/-0.04 mm;
the sizes of the sections of the lip and the tail of the rib of the variable cross-section oil return line are different, the lip is similar to an isosceles right triangle, the height of the bottom edge of the lip is 0.02 +/-0.02 mm, and the width of the bottom edge is 0.04 +/-0.04 mm; the height of the bottom edge of the tail part is 0.15 +/-0.02 mm, and the width of the bottom edge is 0.30 +/-0.04 mm (or the height slope is 0.01-0.03); the distance between the oil return lines is 0.5-1.7 mm between right angles at the top end of the oil return line and the circular cone; the included angle of the oil return line is 23-32 degrees between a right-angle line at the top end of the oil return line and the horizontal line;
the outer rubber 4 is made of fluororubber which comprises the following components: 2462 type fluorine raw rubber of copolymer (fluorine content is 67-70%) of vinylidene fluoride, tetrafluoroethylene and hexafluoropropylene is used as master batch, and carbon black (spray, N990 carbon black or precipitation method white carbon black, gas phase method white carbon black) is added as reinforcing agent; adding acid absorption and promoter (calcium hydroxide and active magnesium oxide); adding an antifriction heat conduction material (graphite, ultrafine molybdenum disulfide powder and long-chain adhesive-based carbon fiber), adding a No. 3 vulcanizing agent (N, N' -bis-cinnamyl-1, 6-hexamethylene diamine) and other auxiliary agents to prepare a rubber compound, and curing the rubber compound to obtain the hardness (Shore A, 74-84); .
The material of the tightening spring 2 is carbon spring steel wire or stainless steel spring steel wire (12Cr18Ni9 or 06Cr18Ni9), and the diameter of the steel wire is selected from 0.30, 0.35, 0.40, 0.45, 0.50 and 0.55 mm; the diameter of the winding spring is selected to include 1.6, 2.0, 2.2 and 2.4 mm.
The metal framework 1 comprises the following materials: a metal framework 1 formed by stamping and turning stainless steel (12Cr18Ni9, 06Cr18Ni9) or 08F cold-rolled steel plate; the thickness of the steel plate is selected to be 1.0, 1.2 and 1.4 mm.
Example 2:
referring to fig. 2, different from embodiment 1, in this embodiment, the oil seal waist portion 6 is an inclined structure, that is, an inclined waist portion, which is formed by extending a working surface downward, and has a uniform inclination angle, and is suitable for pressure-resistant oil seals with a small shaft runout and a low rotation speed.
The invention discloses a preparation method of a power oil return oil seal of an inner wrapping framework of a helicopter speed reducer, which comprises the following production steps:
(A) designing and processing an oil seal product and a mold;
(B) distributing an oil seal fluororubber material formula, mixing the compounded rubber, sampling to test the physical properties, remilling the rubber material after meeting the index requirements, and preparing a semi-finished product (strip) according to the product specification;
(C) processing or purchasing an oil seal reinforcing framework and a tightening spring;
(D) after the surface of the oil seal framework is treated (sand blasting, acid washing or phosphating treatment), coating an adhesive (silane coupling agents such as Kemulock 607 and the like);
(E) putting the semi-finished product and the framework of the rubber material into a mould, and pressurizing for one-stage vulcanization to produce an oil seal according to vulcanization conditions (160 ℃ multiplied by 20min or 170 ℃ multiplied by 10 min);
(F) after trimming flash of the first-stage oil seal, performing second-stage vulcanization;
(G) cutting lips (except for a die pressing lip oil seal) according to the drawing size requirement after secondary vulcanization;
(H) checking the appearance of the product (according to the drawing requirements or GB/T15326-;
(I) a spring is arranged on the oil seal;
(J) randomly extracting 2 oil seals of each batch of each specification, and carrying out a factory dynamic simulation working condition test of 3 multiplied by 24 hours according to the working conditions of technical requirements;
(K) and after the finished product simulation test is qualified, packaging and delivering the rest qualified products.
The invention can be used for oil sealing of shafts with various diameters, and the diameter value can be as follows: 28.00, 45.00, 52.00, 57.20, 57.80, 61.70, 69.90, 74.00, 109.50, 164.90, 170.50 mm;
the oil seal can be provided with the inner diameter of the hole, and the numerical value can be as follows: 40.00, 65.00, 72.00, 79.30, 81.75, 85.00, 88.80, 92.00, 95.00, 135.10, 188.80, 195.50 mm;
the height (width) of the oil seal can be as follows: 6.8, 9.8, 10.0, 12.0, 13.0, 13.4 mm;
the following table shows the specific specification, the use condition and the structure type of the invention:
the above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. The dynamic oil return oil seal of the inner package framework of the helicopter speed reducer is characterized by comprising a reinforced metal framework (1), a hoop-tightening spring (2) and a rubber sealing body; the reinforced metal framework (1) is of an annular structure, the cross section of the reinforced metal framework is L-shaped, and the reinforced metal framework comprises a horizontal section and a vertical section which are integrally formed; the rubber sealing body comprises a main sealing lip body (3) and outer packing rubber (4), the annular main sealing lip body (3) is arranged in the upward direction of the horizontal section, the outer wall of the main sealing lip body (3) is provided with a spring groove, and the tightening spring (2) is arranged in the spring groove; the vertical section and the horizontal section are coated with outer packing rubber (4);
the main sealing lip body (3) comprises a dust-proof auxiliary lip (5), an oil seal waist part (6) and a lip crown part (7) from bottom to top; the inner side of the lip crown part (7) is provided with a lip opening (8), the upper side of the lip opening (8) is a lip front angle, the lower side of the lip opening (8) is a lip rear angle, a working surface is formed at the lip rear angle, a circle of power oil return line (9) is molded on the working surface in a compression molding mode, and the power oil return line (9) is a triangular convex edge forming an included angle of 23-32 degrees with a horizontal line.
2. The helicopter decelerator inner wrap framework power oil return oil seal of claim 1, wherein the oil seal waist (6) is of a vertical structure or an inclined structure.
3. The helicopter speed reducer inner package framework power oil return oil seal according to claim 1 or 2, characterized in that the angle range of the lip front angle inclination is 40-45 °, and the angle range of the lip rear angle inclination is 20-30 °.
4. The helicopter speed reducer inner wrap framework power oil return seal according to claim 3, wherein the structural style of the power oil return line (9) comprises a common uniform cross section oil return line and a variable cross section oil return line; the size of the triangular convex edge of the common uniform-section oil return line at the lip opening is consistent with that of the tail section, and the triangular convex edge is of an isosceles right triangle structure; the size of the triangular convex edge of the variable cross-section oil return line at the lip mouth is different from that of the tail section, and the triangular convex edge is similar to an isosceles right triangle.
5. The helicopter speed reducer inner wrap framework power oil return oil seal according to claim 4, wherein the rubber seal body is made of fluororubber.
6. The helicopter speed reducer inner wrap framework power oil return seal according to claim 5, characterized in that the material of the hoop spring (2) is carbon spring steel wire or stainless steel spring steel wire.
7. The helicopter speed reducer inner wrap framework power oil return oil seal according to claim 6, wherein the metal framework (1) is made of stainless steel or 08F cold rolled steel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011556899.7A CN112728091A (en) | 2020-12-25 | 2020-12-25 | Power oil return oil seal for inner packing framework of helicopter speed reducer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011556899.7A CN112728091A (en) | 2020-12-25 | 2020-12-25 | Power oil return oil seal for inner packing framework of helicopter speed reducer |
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| CN112728091A true CN112728091A (en) | 2021-04-30 |
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| CN202011556899.7A Pending CN112728091A (en) | 2020-12-25 | 2020-12-25 | Power oil return oil seal for inner packing framework of helicopter speed reducer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113829552A (en) * | 2021-09-15 | 2021-12-24 | 西北橡胶塑料研究设计院有限公司 | Method for manufacturing annular special-shaped rubber-plastic metal composite sealing element |
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| CN202971924U (en) * | 2012-12-04 | 2013-06-05 | 青岛开世密封工业有限公司 | Oil seal with double-path backflow stripes |
| CN207454774U (en) * | 2017-11-09 | 2018-06-05 | 江门市鑫辉密封科技有限公司 | A kind of axle sealing ring for adapting to the high big jerk value of rotating speed |
| CN208935377U (en) * | 2018-11-04 | 2019-06-04 | 广东京汕密封件有限公司 | High-speed oil seal is used in New energy automobile motor input |
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2020
- 2020-12-25 CN CN202011556899.7A patent/CN112728091A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07119841A (en) * | 1993-10-28 | 1995-05-12 | Koyo Seiko Co Ltd | Oil seal |
| JPH09217838A (en) * | 1996-02-13 | 1997-08-19 | Koyo Seiko Co Ltd | Oil seal |
| CN202091515U (en) * | 2011-06-20 | 2011-12-28 | 成都盛帮密封件股份有限公司 | Low-pressure resistant and big-jump resistant high-speed oil seal |
| CN202971924U (en) * | 2012-12-04 | 2013-06-05 | 青岛开世密封工业有限公司 | Oil seal with double-path backflow stripes |
| CN207454774U (en) * | 2017-11-09 | 2018-06-05 | 江门市鑫辉密封科技有限公司 | A kind of axle sealing ring for adapting to the high big jerk value of rotating speed |
| CN208935377U (en) * | 2018-11-04 | 2019-06-04 | 广东京汕密封件有限公司 | High-speed oil seal is used in New energy automobile motor input |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113829552A (en) * | 2021-09-15 | 2021-12-24 | 西北橡胶塑料研究设计院有限公司 | Method for manufacturing annular special-shaped rubber-plastic metal composite sealing element |
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