Oil seal anti-loosening structure
By setting up an interference fit groove between the oil seal ring and the shaft hole, the oil seal ring forms a deformation protruding structure and is embedded in the groove, which solves the problems of looseness and displacement of the oil seal, improves the sealing property and reduces processing costs.
Patent Information
- Application Number
- CN202421825825.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The oil seal in the existing tractor transmission box is prone to loosening and displacement due to vibration of the shaft, resulting in a reduction in sealing performance.
By providing an interference fit groove between the oil seal ring and the shaft hole, the oil seal ring naturally forms a deformation convex structure and is embedded in the groove, increasing the stress required for the displacement of the oil seal ring, thereby preventing the oil seal ring from loosening and displacing in the axial direction.
Effectively prevent loosening and displacement of the oil seal ring, improve sealing, avoid lubricant leakage, extend service life and reduce processing costs.
Smart Images
Figure CN223136949U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mechanical shaft oil seals, in particular to an oil seal anti-loosening structure. Background Art
[0002] Oil seals are products that seal lubricating oil. All parts of the operating box that contain liquid lubricating oil and are connected to the outside require oil seals. During installation, the oil seal sleeve is set on the shaft and located on one side of the bearing to prevent the lubricating oil of the bearing from leaking along the axial direction of the shaft. Its main function is to prevent leakage and protect the bearings, while preventing dust, dirt, water vapor, etc. from the outside of the box from entering the bearings and the transmission box. At present, the oil seals in most tractor transmission boxes on the market do not have an anti-slip structure. As the speed of the shaft increases, the shaking of the shaft and the housing increases, causing the vibration of the oil seal lip to increase. When the oil seal vibrates, it is easy to loosen and move along the axial direction of the shaft, resulting in reduced sealing. Utility Model Content
[0003] The technical problem to be solved by the utility model is: how to prevent the oil seal from loosening and displacement.
[0004] The technical solution of the utility model to solve the above technical problems is as follows:
[0005] The utility model provides an oil seal anti-loosening structure, comprising a shell and a rotating shaft, wherein the shell is provided with a shaft hole, the rotating shaft is located in the shell and one end of the rotating shaft extends out of the shaft hole, and an oil seal ring is sleeved on the rotating shaft; a groove is provided on the side wall of the shaft hole, the oil seal ring and the shaft hole are interference fit, and the outer peripheral side part of the oil seal ring is embedded in the groove.
[0006] The beneficial effects of the utility model are:
[0007] By adopting the utility model, the oil seal ring and the shaft hole are interference-fitted, so that the oil seal ring naturally forms a deformed protrusion structure embedded in the groove, which increases the stress required for the displacement of the oil seal ring, thereby preventing the oil seal ring from loosening and displacement in the axial direction, avoiding the gap from becoming larger when the oil seal ring is installed, and at the same time, preventing the movement of the oil seal ring from bringing out the lubricating oil in the axial direction, thereby improving the sealing performance.
[0008] On the basis of the above technical solution, the present invention can also be improved as follows.
[0009] Furthermore, the groove is annular and is arranged circumferentially along the inner wall of the shaft hole.
[0010] It is convenient to form an annular deformation convex structure, so that the oil seal ring is deformed evenly and the service life is increased.
[0011] Further, one side wall of the groove is a planar side wall, and the other side wall is a concave arc side wall. The planar side wall and the concave arc side wall are in tangential transition, and the transition angle formed between the planar side wall and the inner side wall of the shaft hole is an obtuse angle.
[0012] When the oil seal ring is installed into the shaft hole, the oil seal ring moves along the direction of the planar side wall. The deformation gradient on the outer peripheral side of the oil seal ring is small, making it easy to enter the shaft hole and facilitating installation.
[0013] Further, the transition angle formed between the planar side wall and the inner side wall of the shaft hole is 145° - 155°.
[0014] Preferably, the transition angle formed between the planar side wall and the inner side wall of the shaft hole is 150°.
[0015] This facilitates reducing the resistance of the oil seal ring entering the shaft hole and makes the installation convenient.
[0016] Further, the radius of curvature of the concave arc side wall is 0.4 mm - 0.6 mm.
[0017] Preferably, the radius of curvature of the concave arc side wall is 0.5 mm.
[0018] The size of the deformation protrusion is adapted to the deformation ability of the oil seal ring, ensuring that the oil seal ring can smoothly enter the shaft hole. At the same time, effective limiting between the deformation protrusion and the groove is ensured, preventing the oil seal ring from moving axially.
[0019] Further, a limiting step is also provided on the side wall of the shaft hole, and the outer end face of the oil seal ring contacts the limiting step; the planar side wall of the groove is located on the side close to the limiting step.
[0020] The contact surface gap between the oil seal ring and the end cover is L-shaped, facilitating increasing the resistance to lubricating oil leakage and preventing leakage; when the rotating shaft rotates, the limiting step can prevent the oil seal ring from moving along the direction of the planar side face under the action of vibration, improving the sealing performance.
[0021] Further, an end cover is also provided on the housing. A through hole is provided on the end cover, and one end of the rotating shaft extends out of the through hole. The through hole constitutes a part of the shaft hole; the oil seal ring is located in the through hole, and both the groove and the limiting step are provided on the side wall of the through hole.
[0022] The oil seal ring can be pre-installed into the end cover and disassembled and assembled together with the end cover, which is convenient for disassembly and assembly and easy to replace; by machining the groove on the end cover, it is avoided to machine the larger housing, and a smaller machine tool can be used, saving the processing cost.
[0023] Further, the end cover and the housing are connected by a flange. A part of the end cover extends into the housing, and a sealing ring is sleeved on the part of the end cover extending into the housing. The sealing ring contacts the housing; the rotating shaft and the housing are connected by a bearing.
[0024] It is convenient to disassemble and assemble through flange connection; the sealing performance is improved through the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a schematic structural diagram of the present utility model.
[0026] Figure 2 is Figure 1 an enlarged detailed view of part A of
[0027] Figure 3 is Figure 2 an enlarged detailed view of part B of
[0028] In the drawings, the technical features represented by the respective reference numerals are as follows:
[0029] 1 - housing; 2 - rotating shaft; 3 - oil seal ring; 4 - deformation protrusion; 5 - groove; 6 - end cover; 7 - limiting step; 8 - sealing ring; 9 - bearing. SPECIFIC EMBODIMENTS
[0030] The principles and features of the present utility model will be described below with reference to the accompanying drawings. The examples given are only for explaining the present utility model and are not intended to limit the scope of the present utility model.
[0031] The present utility model is shown in Figures 1-3 .
[0032] The present utility model provides an oil seal anti-loosening structure, which includes a housing 1 and a rotating shaft 2. An axial hole is provided on the housing 1, and the rotating shaft 2 is located inside the housing 1 and one end extends out of the axial hole. An oil seal ring 3 is sleeved on the rotating shaft 2; a groove 5 is provided on the side wall of the axial hole. The oil seal ring 3 is in interference fit with the axial hole, and a part of the outer peripheral side of the oil seal ring 3 is embedded in the groove 5.
[0033] Principle:
[0034] The rotating shaft 2 and the housing 1 can be connected through the bearing 9, or other supporting structures can be arranged in the housing 1, and the rotating shaft 2 and the supporting structure are connected through the bearing 9. There is lubricating oil in the housing 1. When the rotating shaft 2 rotates, part of the lubricating oil flows along the rotating shaft 2 or the shaft hole due to the disturbance of the rotating shaft 2. The oil seal ring 3 can block the lubricating oil to prevent the lubricating oil from leaking; at the same time, it prevents dust, dirt, water vapor, etc. outside the box from entering the housing 1 along the shaft hole or the rotating shaft 2. When the oil seal ring 3 is installed in the shaft hole, due to the interference fit, the oil seal ring 3 is compressed and deformed, and the position of the groove 5 has a smaller constraint force on the outer peripheral side of the oil seal ring 3, so the oil seal ring 3 is less deformed at this position, so that the deformation protrusion 4 structure is naturally formed and embedded in the groove 5. At this time, the elastic deformation stress of the oil seal ring 3 is more concentrated at the deformation protrusion 4, so a larger external force is required to deform the position of the deformation protrusion 4 and move the oil seal ring 3 relative to the shaft hole. Therefore, even if the rotation speed of the shaft 2 increases and the disturbance of the shaft 2 to the oil seal ring 3 becomes larger, the oil seal ring 3 will not be loosened or displaced in the axial direction, thereby improving the sealing performance.
[0035] By adopting the utility model, the oil seal ring 3 is interference-fitted with the shaft hole, so that the oil seal ring 3 naturally forms a deformed protrusion 4 structure embedded in the groove 5, thereby increasing the stress required for the displacement of the oil seal ring 3, thereby preventing the oil seal ring 3 from loosening and displacement in the axial direction, avoiding the gap of the oil seal ring 3 from becoming larger when installing, and at the same time, preventing the movement of the oil seal ring 3 from bringing out the lubricating oil in the axial direction, thereby improving the sealing performance.
[0036] Furthermore, the groove 5 is annular and is circumferentially arranged along the inner wall of the shaft hole.
[0037] It is convenient to form the annular deformation protrusion 4 structure, so that the oil seal ring 3 is deformed evenly and the service life is increased.
[0038] Further, such as Figures 2-3 As shown: one side wall of the groove 5 is a plane side wall, and the other side wall is a concave arc side wall. The plane side wall and the concave arc side wall are tangently transitioned, and the transition angle formed between the plane side wall and the inner side wall of the shaft hole is an obtuse angle.
[0039] When the oil seal ring 3 is installed into the shaft hole, the oil seal ring 3 moves along the direction of the plane side wall. The deformation gradient of the outer peripheral side of the oil seal ring 3 is small, so it is easy to enter the shaft hole and is easy to install.
[0040] Furthermore, a transition angle formed between the planar side wall and the inner side wall of the axial hole is 145° to 155°.
[0041] Preferably, Figure 3 As shown: the transition angle formed between the plane side wall and the inner side wall of the axial hole is 150°.
[0042] It is convenient to reduce the resistance of the oil seal ring 3 entering the shaft hole and is easy to install.
[0043] Furthermore, the radius of curvature of the concave arc-shaped side wall is 0.4 mm to 0.6 mm.
[0044] Preferably, as Figure 3 shown: the radius of curvature of the concave arc-shaped side wall is 0.5 mm.
[0045] The size of the deformation protrusion 4 is adapted to the deformation ability of the oil seal ring 3, ensuring that the oil seal ring 3 can smoothly enter the shaft hole, and at the same time ensuring effective limiting between the deformation protrusion 4 and the groove 5 to prevent the oil seal ring 3 from moving axially.
[0046] Furthermore, as Figures 1-2 shown: a limiting step 7 is also provided on the side wall of the shaft hole, and the outer end face of the oil seal ring 3 contacts the limiting step 7; the planar side wall of the groove 5 is located on the side close to the limiting step 7.
[0047] Note: The side of the oil seal ring 3 facing the inside of the housing 1 is the inner end face, and the side facing the outside of the housing 1 is the outer end face.
[0048] The contact surface gap between the oil seal ring 3 and the end cover 6 is L-shaped, which is convenient for increasing the resistance to lubricating oil leakage and preventing leakage; when the rotating shaft 2 rotates, the limiting step 7 can prevent the oil seal ring 3 from moving along the direction of the planar side face under the action of vibration, improving the sealing performance.
[0049] Furthermore, as Figures 1-3 shown: the housing 1 is also provided with an end cover 6, the end cover 6 is provided with a through hole, one end of the rotating shaft 2 extends out of the through hole, and the through hole constitutes a part of the shaft hole; the oil seal ring 3 is located in the through hole, and the groove 5 and the limiting step 7 are both provided on the side wall of the through hole.
[0050] The oil seal ring 3 can be pre-installed in the end cover 6 and disassembled and assembled together with the end cover 6, which is convenient for disassembly and assembly and easy to replace; by machining the groove 5 on the end cover 6, it is avoided to machine the relatively large housing 1, and a smaller machine tool can be used, saving the processing cost.
[0051] Furthermore, as Figure 1 shown: the end cover 6 and the housing 1 are connected by a flange, a part of the end cover 6 extends into the housing 1, a sealing ring 8 is sleeved on the part of the end cover 6 extending into the housing 1, and the sealing ring 8 contacts the housing 1; the rotating shaft 2 and the housing 1 are connected by a bearing 9.
[0052] The connection by flange is convenient for disassembly and assembly; through the sealing ring 8, the sealing performance is improved.
[0053] In the description of the present utility model, it should be understood that if descriptive terms indicating orientation, direction or positional relationship appear, such as: "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of understanding the present utility model and simplifying the description, rather than indicating or implying that the indicated part, element or whole must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.
[0054] In addition, if descriptive terms indicating order appear, such as: "first", "second", etc., their use in this specification is for the convenience of understanding or simplifying the description. For example, in order to distinguish multiple technical features of the same type or function and having to be mentioned separately, this specification may use the method of prefixing or suffixing descriptive terms of order to distinguish them. Therefore, it should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.
[0055] In the present utility model, if descriptive terms indicating the relationship between structure and function are used, such as: "installed", "connected", "joined", "fixed", etc., unless otherwise clearly specified and defined, they should be understood in a broad sense. For example, "installed", "connected", "joined", etc. can be a fixed connection, a detachable connection, or integrated; can be a mechanical connection or an electrical connection; can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements; "fixed" can be a fixed connection formed integrally or a detachable fixed connection through fasteners; can be directly fixed or fixed through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above descriptive terms in the present utility model can be understood according to specific circumstances, the context, the coherence of the context before and after, etc.
[0056] In the present utility model, if there are descriptive terms with an affiliated or connecting meaning, for example, the first feature is "on" or "under" the second feature, unless otherwise clearly specified and defined, it should not be understood restrictively. For example, "on" or "under" can mean that the first and second features are in direct contact, or that the first feature and the second feature are in indirect contact through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above descriptive terms in the present utility model can be understood according to specific circumstances, the context, the coherence of the context before and after, etc.
[0057] Furthermore, the first feature being "above", "over" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.
[0058] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments, examples, and the features of different embodiments and examples described in this specification, and these combinations or combinations should all fall within the scope summarized by the present utility model.
[0059] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of information available through their public channels and in combination with the technical revelations given in this application document.
Claims
1. An anti-loosening structure for an oil seal, characterized in that: It includes a housing (1) and a rotating shaft (2). A shaft hole is provided on the housing (1). The rotating shaft (2) is located inside the housing (1) and one end extends out of the shaft hole. An oil seal ring (3) is sleeved on the rotating shaft (2); a groove (5) is provided on the side wall of the shaft hole. The oil seal ring (3) is in interference fit with the shaft hole, and a part of the outer peripheral side of the oil seal ring (3) is embedded in the groove (5).
2. The anti-loosening structure of the oil seal according to claim 1, characterized in that: The groove (5) is annular and is arranged circumferentially along the inner side wall of the shaft hole.
3. The anti-loosening structure of the oil seal according to claim 2, characterized in that: One side wall of the groove (5) is a planar side wall, and the other side wall is a concave arc side wall. The transition between the planar side wall and the concave arc side wall is tangential. The transition angle formed between the planar side wall and the inner side wall of the shaft hole is an obtuse angle.
4. The anti-loosening structure of the oil seal according to claim 3, characterized in that: The transition angle formed between the planar side wall and the inner side wall of the shaft hole is 145° - 155°.
5. The oil seal anti-loosening structure according to claim 4, characterized in that: The transition angle formed between the planar side wall and the inner side wall of the shaft hole is 150°.
6. The anti-loosening structure of the oil seal according to claim 3, characterized in that: The radius of curvature of the concave arc side wall is 0.4 mm - 0.6 mm.
7. The anti-loosening structure of the oil seal according to claim 6, characterized in that: The radius of curvature of the concave arc side wall is 0.5 mm.
8. The anti-loosening structure of the oil seal according to claim 3, wherein: A limiting step (7) is further provided on the side wall of the shaft hole. The outer end face of the oil seal ring (3) contacts the limiting step (7); the planar side wall of the groove (5) is located on the side close to the limiting step (7).
9. The anti-loosening structure of the oil seal according to claim 8, characterized in that: A end cover (6) is further provided on the housing (1). A through hole is provided on the end cover (6). One end of the rotating shaft (2) extends out of the through hole. The through hole constitutes a part of the shaft hole; the oil seal ring (3) is located in the through hole, and both the groove (5) and the limiting step (7) are provided on the side wall of the through hole.
10. The anti-loosening structure of the oil seal according to claim 9, characterized in that: The end cover (6) is connected to the housing (1) by a flange. A part of the end cover (6) extends into the housing (1). A sealing ring (8) is sleeved on the part of the end cover (6) extending into the housing (1). The sealing ring (8) contacts the housing (1); the rotating shaft (2) is connected to the housing (1) by a bearing (9).