CN114576361A - Shaft seal combined oil seal - Google Patents

Shaft seal combined oil seal Download PDF

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Publication number
CN114576361A
CN114576361A CN202011373503.5A CN202011373503A CN114576361A CN 114576361 A CN114576361 A CN 114576361A CN 202011373503 A CN202011373503 A CN 202011373503A CN 114576361 A CN114576361 A CN 114576361A
Authority
CN
China
Prior art keywords
lip
seal
oil
oil seal
shaped sealing
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
Application number
CN202011373503.5A
Other languages
Chinese (zh)
Inventor
刘杰
丁炜琦
程遥
冯江峰
雷鹏
鬲晨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shaanxi Hande Axle Co Ltd
Original Assignee
Shaanxi Hande Axle Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shaanxi Hande Axle Co Ltd filed Critical Shaanxi Hande Axle Co Ltd
Priority to CN202011373503.5A priority Critical patent/CN114576361A/en
Publication of CN114576361A publication Critical patent/CN114576361A/en
Pending legal-status Critical Current

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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
    • 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
    • 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

Abstract

The application relates to a shaft seal combination oil seal, include: steel skeleton, lip-shaped sealing ring and back-to-back combined double-lip oil seal are wrapped outside; the lip-shaped sealing rings and the back-to-back combined double-lip oil seals are sequentially arranged in the steel-clad framework from the outside air side to the inside lubricating oil side and are in interference fit with the steel-clad framework; the lip of the lip-shaped sealing ring faces towards the external air side; the lip-shaped sealing ring is a high-rigidity wear-resistant elastomer, so that the lip forms a hard scraper structure. The application provides an oil blanket is particularly useful for the last combination oil blanket of steering drive axle universal drive shaft of operational environment for muddy water, and it is poor that it has solved the rotation axis lip seal protective capability among the prior art, is under the operating environment is the operating mode of muddy water to when the rotation axis has axial motion, the defect of life-span weak point.

Description

Shaft seal combined oil seal
Technical Field
The application belongs to the technical field of shaft seal, especially relates to a shaft seal combination oil blanket.
Background
For a steering drive axle of a heavy truck or agricultural machinery, particularly in a severe environment with muddy water as a working condition, a universal transmission shaft oil seal of the steering drive axle is easily abraded by abrasive particles in the muddy water, and early abrasion failure occurs. In addition, when the steering drive axle turns, axial displacement can take place between universal drive shaft and the oil blanket, and the vice lip of traditional oil blanket can not effectively block the grit in the muddy water and attached to the rotatory epaxial earth crust layer, and leads to direct wearing and tearing to seal the oil lip mouth.
Disclosure of Invention
For solving the problem that exists among the above-mentioned background art, this application provides a shaft seal combination oil blanket, and it can overcome traditional rotation axis lip seal and be life weak point in the adverse circumstances that the operating mode is muddy water, overcomes the problem that box-type oil blanket is not applicable to the operating mode that the rotation axis has axial displacement simultaneously.
Specifically, the application provides a shaft seal combination oil blanket, includes: steel skeleton, lip-shaped sealing ring and back-to-back combined double-lip oil seal are wrapped outside;
the lip-shaped sealing rings and the back-to-back combined double-lip oil seals are sequentially arranged in the steel-clad framework from the outside air side to the inside lubricating oil side and are in interference fit with the steel-clad framework;
the lip of the lip-shaped sealing ring faces towards the external air side; the lip-shaped sealing ring is a high-rigidity wear-resistant elastomer, so that a lip of the lip-shaped sealing ring forms a hard scraper structure.
As a further explanation of this application, lip-shaped sealing washer with the back to back formula double-lip oil blanket the excircle all with the interior circle of outsourcing steel skeleton forms interference fit and connects, just the inside lubricating oil side of outsourcing steel skeleton is formed with first flange structure, first flange structure will lip-shaped sealing washer with back to back formula double-lip oil blanket pressfitting.
As a further explanation of the present application, a teflon sheet is vulcanized on the inner side of the lip seal.
As a further explanation of this application, the outside air side of outsourcing steel skeleton sets up rather than coaxial annular flange structure of bending outward, just annular flange structure's axial length is 5mm, just circle diameter ratio in the annular flange structure with the oil blanket complex rotation axis diameter is 0.3 ~ 0.5mm big.
As a further description of the present application, the lip seal has an included angle α of 60 ° to 90 ° on the outer air side lip surface and an included angle β of 30 ° to 45 ° on the inner lubricating oil side lip surface.
As a further description of the present application, the lip seal ring is made of a polyurethane elastomer with a shore hardness of 90.
As a further explanation of the present application, the two lips of the back-to-back combined double-lip oil seal are arranged back-to-back, and the back-to-back combined double-lip oil seal includes a water seal lip facing the outside air side and an oil seal lip facing the inside lubricating oil side.
As further explained in the present application, the lip surface angle α of the external air side of the water seal lip and the internal lubricating oil side of the oil seal lip1＝α260 DEG, a lip surface angle beta between the internal lubricating oil side of the water seal lip and the external air side of the oil seal lip1＝β2＝30°。
As a further explanation of the application, the lip interference of the oil sealing lip is 2mm, the lip interference of the water sealing lip is 1.2mm, and the lip interference of the lip-shaped sealing ring is 0.4 mm.
As a further explanation of the application, the lip height of the water sealing lip and the size of the tightening spring are both smaller than those of the oil sealing lip.
Compared with the prior art, the method has the following beneficial technical effects:
(1) in the application, the outer steel skeleton is used as a dust cover to prevent larger abrasive particles in the muddy water from entering the oil seal; the lip-shaped sealing ring has higher wear resistance, so that the service life of the lip-shaped sealing ring is obviously prolonged; the back-to-back double-lip oil seal can effectively separate muddy water from lubricating oil, and the service life of the combined oil seal in a muddy water working condition is far longer than that of a traditional rotary shaft lip-shaped sealing ring.
(2) The application provides an oil blanket lip is radial seal, is applicable to the rotation axis and has axial displacement's operating mode, and simultaneously, the lip seal circle of polyurethane elastomer material has great rigidity, when axial displacement takes place for the rotation axis, plays the effect of pollutant scraper blade.
(3) The annular flanging structure that outsourcing steel skeleton outwards extended in this application plays the guide effect when the assembly rotation axis, does not need special frock or sheath, makes the installation simple convenient, and the difficult emergence of oil blanket lip turns over lip or damaged condition.
Drawings
FIG. 1 is a schematic cross-sectional view of a shaft seal assembly oil seal provided in the present application;
fig. 2 and 3 are half sectional views of the shaft seal combination oil seal provided by the application;
FIG. 4 is a half sectional view of a shaft seal combination oil seal without an annular flange structure provided by the present application;
FIG. 5 is a semi-sectional view of a shaft seal assembly oil seal with a vulcanized PTFE sheet as provided herein;
FIG. 6 is a half sectional view of the shaft seal combination oil seal provided by the present application with independent water sealing lips and oil sealing lips;
fig. 7 is a half sectional view of the shaft seal combination oil seal provided by the present application, in which the lip seal, the water seal lip and the oil seal lip are independent of each other.
Description of the reference numerals
The oil seal comprises an outer steel-clad framework 1, an annular flanging structure 101, a first flanging structure 102, a lip-shaped sealing ring 2, a lip mouth 201 of the lip-shaped sealing ring, a polytetrafluoroethylene sulfide sheet 222, a back-to-back combined double-lip oil seal 3, a water sealing lip 301 and an oil sealing lip 302.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when in use, and are used only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The technical solution of the present application will be explained with reference to specific embodiments.
As shown in fig. 1 to 3, there is provided a shaft seal assembly oil seal, including: the outer steel frame 1, the lip-shaped sealing ring 2 and the back-to-back combined double-lip oil seal 3 are wrapped;
the lip-shaped sealing ring 2 and the back-to-back combined double-lip oil seal 3 are sequentially arranged in the steel external wrapping framework 1 in the sequence from the outside air side to the inside lubricating oil side and are in interference fit with the steel external wrapping framework 1;
the lip 201 of the lip-shaped sealing ring 2 faces towards the external air side; the lip-shaped sealing ring 2 is a high-rigidity wear-resistant elastomer, so that a lip 201 of the lip-shaped sealing ring forms a hard scraper structure;
the lip-shaped sealing ring 2 is used as a dustproof lip of a combined oil seal, the rigidity of the lip-shaped sealing ring is higher than that of rubber for a traditional oil seal, muddy water or hardened soil can be effectively separated under the working condition that a rotating shaft has axial displacement, the lip-shaped sealing ring plays a role of a pollutant scraper, the service life of the lip-shaped sealing ring 2 can be effectively prolonged due to good wear resistance of the lip-shaped sealing ring, the lip-shaped sealing ring 2 preferably adopts a polyurethane elastomer with the Shore hardness of 90, the wear resistance of the lip-shaped sealing ring is 3-5 times that of the rubber, the service life of the lip-shaped sealing ring can be obviously prolonged, and compared with an oil seal adopting the polyurethane elastomer in the traditional oil seal and an oil seal adopting the polyurethane elastomer in the application through a mud bench test, the shaft seal combined oil seal provided by the application is found to be more than 4 times of the service life of the lip-shaped sealing ring of the traditional rotating shaft; of course, the material of the lip-shaped sealing ring 2 is not limited to the polyurethane elastomer, and may be other elastic materials meeting the requirements on strength and wear resistance;
although the traditional box-type oil seal has excellent muddy water prevention capacity, the traditional box-type oil seal is not suitable for the working condition that the rotating shaft has axial displacement, the axial displacement of the rotating shaft enables the inner ring and the outer ring of the box-type oil seal to be separated or close to each other, the interference magnitude of the axial sealing lip of the box-type oil seal is reduced or increased, the sealing failure or the heat productivity is greatly increased, and the service life of the box-type oil seal is extremely short. And the oil blanket lip that this application provided is radial seal, is applicable to the rotation axis and has axial displacement's operating mode, and simultaneously, the lip seal circle of polyurethane elastomer material has great rigidity, when axial displacement takes place for the rotation axis, plays the effect of pollutant scraper blade.
For example, in an implementation manner, as shown in fig. 5, the inner side of the lip 201 of the lip seal may further include a vulcanized polytetrafluoroethylene sheet 222, and the lip seal 2 itself is replaced by rubber, so that the wear resistance of the lip seal 2 can be increased, the service life of the lip seal can be prolonged, and under the condition that the rotating shaft has axial displacement, muddy water or hardened soil can be effectively blocked, and the lip seal can function as a pollutant scraper.
In addition, for the selection of the assembling interference magnitude of the lip-shaped sealing ring 2, multiple trial production finds that if the interference magnitude is too large, lip overturning occurs in the assembling process of the lip-shaped sealing ring 2, and the service life of the lip-shaped sealing ring 2 is influenced; if the interference is small, the necessary sealing function will not be performed, and the oil sealing effect will be affected, so finally the lip interference of the lip seal 2 is preferably set to 0.4 mm.
Furthermore, because the lip seal ring 2 itself should play the dual role of sealing and pollutant scraper, its front and back lip angle also needs to be further designed, after many trial productions, finally choose to set the outside air side lip surface included angle of the lip seal ring 2 to α 60 ° -90 °, set the inside lubricating oil side lip surface included angle to β 30 ° -45 °, and design the front and back lip angle with such a range value, so that when the rotation axis enters the lip seal ring 2, the rigidity of the lip seal ring 2 is higher than the rigidity when the rotation axis separates from the lip seal ring 2.
In an achievable mode, the interference fit relationship among the lip-shaped sealing ring 2, the back-to-back double-lip oil seal 3 and the steel frame 1 is as follows: lip seal 2 with back to back formula double lip oil blanket 3's excircle all with outsourcing steel skeleton 1's interior circle forms interference fit and connects, just outsourcing steel skeleton 1's inside lubricating oil side is formed with first flanging structure 102, first flanging structure 102 will lip seal 2 with back to back formula double lip oil blanket 3 pressfitting, the material of outsourcing steel skeleton 1 wherein does not confine to the steel sheet, also can be other materials that satisfy the requirement in intensity.
In an implementation mode, as shown in fig. 1 to 3, an annular flanging structure 101 which is coaxial with the external air side of the external steel skeleton 1 and is bent outwards may be further provided at the external air side of the external steel skeleton 1, the axial length of the annular flanging structure 101 is 5mm, the diameter of the inner circle of the annular flanging structure 101 is 0.3-0.5 mm larger than that of the rotating shaft which is matched with the oil seal, so as to play a role of a dust cover, and meanwhile, when the rotating shaft is assembled, an assembly guiding role is played, so as to prevent the lip of the oil seal from being extruded by the shoulder of the rotating shaft to cause lip turning.
In an implementation manner, two lips of the back-to-back combined double-lip oil seal 3 are arranged back-to-back, and the back-to-back combined double-lip oil seal 3 comprises a water sealing lip 301 facing to the external air side and an oil sealing lip 302 facing to the internal lubricating oil side, and in addition, lip front and back lip angles of the water sealing lip 301 and the oil sealing lip 302 are designed according to the pump pumping principle of oil seal dynamic sealing, specifically, a lip surface included angle α between the external air side of the water sealing lip 301 and the internal lubricating oil side of the oil sealing lip 3021＝α260 °, lip surface angle β between the inner lubricant side of the water seal lip 301 and the outer air side of the oil seal lip 3021＝β2The front lip angle of the lubricating oil side is larger than the rear lip angle of the air side, so that the water seal lip 301 and the oil seal lip 302 play respective sealing roles, and sealed fluid can be pumped from the end with the small lip angle to the end with the large lip angle;
correspondingly, the lip interference of the oil seal lip 302 is preferably 2mm, the lip interference of the water seal lip 301 is preferably 1.2mm, and the lip height and the tightening spring specification of the water seal lip 301 are both smaller than that of the oil seal lip 8.
In an achievable mode, as shown in fig. 6, the back-to-back combined double-lip oil seal 3 can be obtained by combining independent water sealing lips 301 and oil sealing lips 302, which can avoid the mutual influence of the two lips and reduce the difficulty of rubber vulcanization of the oil seal, but the overall width of the oil seal in this mode should be increased.
In an achievable manner, as shown in fig. 7, the lip seal 2, the water seal lip 301 and the oil seal lip 302 can be disassembled and assembled independently, i.e. the parts can be replaced individually.
The embodiments given above are preferable examples for implementing the present application, and the present application is not limited to the above-described embodiments. Any non-essential addition or replacement made by a person skilled in the art according to the technical features of the technical solution of the present application falls within the scope of the present application.

Claims (10)

1. The utility model provides a shaft seal combination oil blanket which characterized in that includes: the steel framework, the lip-shaped sealing ring and the back-to-back combined double-lip oil seal are wrapped outside;
the lip-shaped sealing rings and the back-to-back combined double-lip oil seals are sequentially arranged in the steel-clad framework from the outside air side to the inside lubricating oil side and are in interference fit with the steel-clad framework;
the lip of the lip-shaped sealing ring faces towards the external air side; the lip-shaped sealing ring is a high-rigidity wear-resistant elastomer, so that a lip of the lip-shaped sealing ring forms a hard scraper structure.
2. The shaft seal combination oil seal according to claim 1, wherein the outer circles of the lip-shaped seal ring and the back-to-back double-lip oil seal are connected with the inner circle of the steel outer wrapping framework in an interference fit manner, and a first flanging structure is formed on the inner lubricating oil side of the steel outer wrapping framework and presses the lip-shaped seal ring and the back-to-back double-lip oil seal together.
3. The shaft seal assembly oil seal of claim 1, wherein the lip inner side of the lip seal is vulcanized with a polytetrafluoroethylene sheet.
4. The shaft seal combination oil seal according to claim 1, wherein an outward bent annular flanging structure coaxial with the steel frame is arranged on the outer air side of the steel frame, the axial length of the annular flanging structure is 5mm, and the diameter of the inner circle of the annular flanging structure is 0.3-0.5 mm larger than the diameter of the rotating shaft matched with the oil seal.
5. The shaft seal assembly oil seal of claim 1, wherein the lip seal has an included angle α of 60 ° to 90 ° on the outer air side lip surface and an included angle β of 30 ° to 45 ° on the inner lubricant side lip surface.
6. The shaft seal assembly oil seal of claim 1, wherein the lip seal ring is made of a polyurethane elastomer with a shore hardness of 90.
7. The shaft seal assembly oil seal of claim 1, wherein the two lips of said back-to-back combination double-lip oil seal are in a back-to-back arrangement and said back-to-back combination double-lip oil seal includes a water seal lip facing the outside air side and an oil seal lip facing the inside lubricating oil side.
8. The shaft seal assembly oil seal of claim 7, wherein the lip surface angle α between the external air side of the water seal lip and the internal lubricating oil side of the oil seal lip1＝α260 DEG, a lip surface angle beta between the internal lubricating oil side of the water seal lip and the external air side of the oil seal lip1＝β2＝30°。
9. The shaft seal combination oil seal according to claim 7, wherein the lip interference of the oil sealing lip is 2mm, the lip interference of the water sealing lip is 1.2mm, and the lip interference of the lip seal ring is 0.4 mm.
10. The shaft seal assembly oil seal of claim 7, wherein the lip height of the water seal lip and the tightening spring specification are both smaller than the oil seal lip.
CN202011373503.5A 2020-11-30 2020-11-30 Shaft seal combined oil seal Pending CN114576361A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011373503.5A CN114576361A (en) 2020-11-30 2020-11-30 Shaft seal combined oil seal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011373503.5A CN114576361A (en) 2020-11-30 2020-11-30 Shaft seal combined oil seal

Publications (1)

Publication Number Publication Date
CN114576361A true CN114576361A (en) 2022-06-03

Family

ID=81768054

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011373503.5A Pending CN114576361A (en) 2020-11-30 2020-11-30 Shaft seal combined oil seal

Country Status (1)

Country Link
CN (1) CN114576361A (en)

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