Skeleton oil seal with oil storage and return function

Abstract

The utility model provides a kind of skeleton oil seal with oil storage and oil return function, the skeleton oil seal with oil storage and oil return function, by being formed with shuttle-shaped oil return line of helical extension on the first sealing surface of main sealing part, when rotating, shuttle-shaped oil return line can change lubricating oil flow direction, forms pumping effect, and the leaked lubricating oil is guided back into sealing cavity;Simultaneously, the structure of shuttle-shaped oil return line can gather pressure due to the change of cross-sectional area, form higher local suction pressure, improve sealing effect;The oil storage groove of the end of shuttle-shaped oil return line is set, can destroy the surface tension of lubricating oil, guide lubricating oil into oil storage groove, can temporarily store a small amount of lubricating oil, and oil in oil storage groove can be reintroduced into sealing cavity by centrifugal force generated when rotating.

Description

Technical Field

[0001] This application relates to the field of oil seal technology for automobile engines, axles, and transmissions, and in particular to a skeleton oil seal with oil storage and return functions. Background Technology

[0002] The patent with authorization announcement number CN204573101U and invention title "Spindle-shaped oil return line skeleton oil seal" discloses a spindle-shaped oil return line skeleton oil seal. The skeleton oil seal includes an outer oil seal, an oil seal skeleton, and a ring spring. The oil seal skeleton is set inside the outer oil seal. The outer oil seal is provided with a main lip and a secondary lip. An oil return line is provided at the main lip. The oil return line is spindle-shaped and can play a good oil sealing role even at low speed.

[0003] However, even with the above solutions, some grease will still leak during high-speed and continuous long-term use. Utility Model Content

[0004] To solve the above-mentioned technical problems, this application provides a skeleton oil seal with oil storage and return function, including an oil seal body, an oil seal skeleton and a spring; The oil seal body includes an outer oil seal portion and an inner oil seal portion connected to each other; the oil seal skeleton is embedded between the outer oil seal portion and the inner oil seal portion; the spring is embedded on the outer periphery of the inner oil seal portion; the inner wall of the inner oil seal protrudes in the direction of the rotation axis to form a main sealing portion and a secondary sealing portion spaced apart; The main sealing part includes a first sealing surface that is inclined along the axial direction; a spirally extending shuttle-shaped oil return line and an oil storage groove are formed on the first sealing surface, and the oil storage groove is located at one end of the oil return line near the secondary sealing part.

[0005] In some embodiments of this application, the oil storage tank is in the shape of a willow leaf arc; the cross-sectional width of the oil storage tank gradually decreases from the center to both ends.

[0006] In some embodiments of this application, the extension direction of the oil storage tank is the same as the extension direction of the shuttle-shaped return oil line.

[0007] In some embodiments of this application, there are multiple shuttle-shaped oil return lines and oil storage tanks, which are arranged at equal intervals along the first sealing surface.

[0008] In some embodiments of this application, the oil storage tank has symmetrically arranged arc-shaped concave surfaces.

[0009] Compared with the prior art, the present invention has the following advantages and beneficial effects: The skeleton oil seal with oil storage and return function of this application forms a spirally extending shuttle-shaped oil return line on the first sealing surface of the main sealing part. When rotating, the shuttle-shaped oil return line can change the flow direction of lubricating oil, forming a pumping effect and guiding the leaked lubricating oil back into the sealing cavity; at the same time, due to the change in cross-sectional area, the shuttle-shaped oil return line structure can accumulate pressure, forming a higher local suction pressure and improving the sealing effect; the oil storage groove set at the end of the shuttle-shaped oil return line can break the surface tension of the lubricating oil, guide the lubricating oil into the oil storage groove, temporarily store a small amount of lubricating oil, and the oil in the oil storage groove can be reintroduced into the sealing cavity by the centrifugal force generated during rotation.

[0010] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit this document. Attached Figure Description

[0011] The accompanying drawings, which form part of this document, are used to provide a further understanding of the document. The illustrative embodiments and descriptions herein are used to explain the document and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a cross-sectional view of a skeleton oil seal with oil storage and return functions provided in an exemplary embodiment of this application; Figure 2 yes Figure 1 Enlarged view at point A in the middle; Figure 3 yes Figure 2 Sectional view at point AA; Figure 4 yes Figure 2 Sectional view at point BB; Figure 5 yes Figure 2 View from the center (K ​​direction).

[0012] In the picture: 1. External oil seal; 2. Oil seal skeleton; 3. Spring; 4. Main seal; 5. Inner oil seal; 6. Secondary seal; 7. Shuttle-shaped oil return line; 8. Oil reservoir. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0014] The patent with authorization announcement number CN204573101U and invention title "Spindle-shaped oil return line skeleton oil seal" discloses a spindle-shaped oil return line skeleton oil seal. The skeleton oil seal includes an outer oil seal, an oil seal skeleton, and a ring spring. The oil seal skeleton is set inside the outer oil seal. The outer oil seal is provided with a main lip and a secondary lip. An oil return line is provided at the main lip. The oil return line is spindle-shaped and can play a good oil sealing role even at low speed.

[0015] However, even with the above solutions, some grease will still leak during high-speed and continuous long-term use.

[0016] Based on this, an exemplary embodiment of this application provides a skeleton oil seal with oil storage and return functions. By forming a spirally extending shuttle-shaped oil return line on the first sealing surface of the main sealing part, when rotating, the shuttle-shaped oil return line can change the flow direction of the lubricating oil, forming a pumping effect and guiding the leaked lubricating oil back into the sealing cavity. At the same time, due to the change in cross-sectional area, the shuttle-shaped oil return line structure can accumulate pressure, forming a higher local suction pressure and improving the sealing effect. The oil storage groove provided at the end of the shuttle-shaped oil return line can break the surface tension of the lubricating oil, guide the lubricating oil into the oil storage groove, temporarily store a small amount of lubricating oil, and the oil in the oil storage groove can be reintroduced into the sealing cavity by the centrifugal force generated during rotation.

[0017] An exemplary embodiment of this application provides a skeleton oil seal with oil storage and return functions, such as... Figure 1 As shown, the skeleton oil seal includes an oil seal body, an oil seal skeleton 2, and a spring 3; preferably, the spring 3 is an annular spring 3; the oil seal body includes an outer oil seal part 1 and an inner oil seal part 5 connected to each other; the oil seal skeleton 2 is embedded between the outer oil seal part 1 and the inner oil seal part 5 to support the inner oil seal part 5 and the outer oil seal part 1; an annular groove is provided on the outer peripheral surface of the inner oil seal part 5, and the spring 3 is embedded in the annular groove on the outer peripheral surface of the inner oil seal part 5; the inner wall of the inner oil seal protrudes in the direction of the rotation axis to form a main sealing part 4 and a secondary sealing part 6 spaced apart.

[0018] The main sealing part 4 includes a first sealing surface inclined along the axial direction; when the shaft is installed in the skeleton oil seal, the first sealing surface and the outer peripheral surface of the shaft are in sealing contact. A spirally extending shuttle-shaped oil return line 7 and an oil reservoir 8 are formed on the first sealing surface. The oil reservoir 8 is located at one end of the oil return line near the secondary sealing part 6, and one end of the oil reservoir 8 is connected to the end of the shuttle-shaped oil return line 7. Preferably, as... Figure 3As shown, the spindle-shaped oil return line 7 is a concave oil return groove, the depth of which is less than the depth of the oil storage groove 8. The oil return groove has inclined and symmetrically arranged inner walls, with the two inner walls arranged at an angle to form an oil return line that can store a small amount of lubricating oil and has a guiding function. When the shaft rotates, the spindle-shaped oil return line 7 can change the flow direction of the lubricating oil, forming a pumping effect and guiding the leaked lubricating oil back into the sealing cavity. At the same time, due to the change in cross-sectional area, the structure of the spindle-shaped oil return line 7 can accumulate pressure, forming a higher local suction pressure and improving the sealing effect. The oil storage groove 8 at the end of the spindle-shaped oil return line 7 can break the surface tension of the lubricating oil, guide the lubricating oil into the oil storage groove 8, and temporarily store a small amount of lubricating oil. The oil in the oil storage groove 8 can be reintroduced into the sealing cavity by the centrifugal force generated during rotation.

[0019] The oil reservoir 8 can store a small amount of lubricating oil. Due to the presence of lubricating oil, dry wear will not occur between the shaft and the oil seal skeleton, which reduces the relative wear between the rotating shaft and the main sealing part 4 of the oil seal and extends the service life of the product. At the same time, due to the presence of lubricating oil, lubrication is good, which can reduce the temperature rise of the sealing area while extending the product life and improving the operational stability of the equipment.

[0020] Preferred, such as Figure 2 As shown, there are multiple shuttle-shaped oil return lines 7 and oil reservoirs 8, arranged at equal intervals along the first sealing surface. The spiral direction of the shuttle-shaped oil return lines 7 and oil reservoirs 8 is the same as the rotation direction of the shaft. The oil reservoir 8 is in the shape of a willow leaf arc, and its cross-sectional width gradually decreases from the center to both ends. The wide cross-section in the middle of the shuttle-shaped oil reservoir 8 can form a lubricating oil temporary storage area, which can force the lubricating oil to flow back into the sealing cavity.

[0021] To improve oil storage and return performance, the extension direction of the oil storage tank 8 is the same as the extension direction of the shuttle-shaped return oil line 7, that is, the oil storage tank 8 extends along the direction of the shuttle-shaped return oil line 7, so that the lubricating oil can enter the oil storage tank 8 along the return oil line.

[0022] like Figure 4 As shown, the oil reservoir 8 has symmetrically arranged arc-shaped concave surfaces, which can guide the lubricating oil to flow smoothly and reduce the risk of oil splashing. Figure 5 As shown, the top surface of the oil reservoir 8 can be lower than the top surface of the first sealing surface, which ensures that the lubricating oil preferentially converges into the oil reservoir under the action of centrifugal force. At the same time, the concave top surface structure of the oil reservoir 8 forms a low-pressure area on the first sealing surface, creating a larger pressure difference with the high-pressure area on the outside of the first sealing surface, thereby enhancing the pumping return oil effect. It also allows dust and other particles to enter the oil reservoir without being drawn into the space between the shaft and the sealing surface, preventing wear and extending the life of the skeleton oil seal.

[0023] This application discloses a skeleton oil seal with oil storage and return functions. A spirally extending shuttle-shaped oil return line 7 is formed on the first sealing surface of the main sealing part 4. During rotation, the shuttle-shaped oil return line 7 changes the flow direction of the lubricating oil, creating a pumping effect and guiding leaked lubricating oil back into the sealing cavity. Simultaneously, due to the change in cross-sectional area, the shuttle-shaped oil return line 7 can accumulate pressure, creating a higher local suction pressure and improving the sealing effect. An oil storage groove 8 is provided at the end of the shuttle-shaped oil return line 7, which can disrupt the surface tension of the lubricating oil, guiding the lubricating oil into the oil storage groove 8. This temporarily stores a small amount of lubricating oil, preventing leakage. Furthermore, the centrifugal force generated during rotation can reintroduce the oil from the oil storage groove 8 into the sealing cavity.

[0024] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0025] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0026] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, the intent of this application also includes these modifications and variations.

Claims

1. A skeleton oil seal with oil storage and return function, characterized in that, Includes the oil seal body, oil seal frame, and spring; The oil seal body includes an outer oil seal portion and an inner oil seal portion connected to each other; the oil seal skeleton is embedded between the outer oil seal portion and the inner oil seal portion; the spring is embedded on the outer periphery of the inner oil seal portion; the inner wall of the inner oil seal protrudes in the direction of the rotation axis to form a main sealing portion and a secondary sealing portion spaced apart; The main sealing part includes a first sealing surface that is inclined along the axial direction; a spirally extending shuttle-shaped oil return line and an oil storage groove are formed on the first sealing surface, and the oil storage groove is located at one end of the oil return line near the secondary sealing part.

2. The skeleton oil seal with oil storage and return function according to claim 1, characterized in that, The oil storage tank is shaped like a willow leaf arc; the cross-sectional width of the oil storage tank gradually decreases from the center to both ends.

3. The skeleton oil seal with oil storage and return function according to claim 1, characterized in that, The oil storage tank extends in the same direction as the shuttle-shaped return oil line.

4. The skeleton oil seal with oil storage and return function according to claim 1, characterized in that, There are multiple shuttle-shaped oil return lines and oil storage tanks, which are arranged at equal intervals along the first sealing surface.

5. The skeleton oil seal with oil storage and return function according to any one of claims 1 to 4, characterized in that, The oil storage tank has symmetrically arranged arc-shaped concave surfaces.

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