Oil pan sealing structure
By setting a limit and sealing structure on the automobile oil pan and oil drain plug, using thermoplastic material and O-shaped sealing ring, the problem of degradation of sealing performance of traditional automobile oil pan is solved, and an efficient and low-cost sealing effect is achieved .
Patent Information
- Application Number
- CN202421193164.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-05-29
AI Technical Summary
The sealing performance of traditional automobile oil pans has a hidden danger of oil seepage. The existing solutions have added production steps and cannot effectively solve the sealing problem, especially the problem of degradation of sealing performance caused by different thermal expansion coefficients of plastic parts and metal parts.
The oil pan and oil drain plug are made of thermoplastic plastic. The shaft is realized by setting the limit bumps, pre-tightening bosses, limit bosses, screws and O-shaped sealing rings on the oil drain plug and oil drain ports. Double anti-loosening and radial directions to ensure sealing performance.
The reliability and installation convenience of the oil pan seal structure are achieved, production costs and weight are reduced, seal performance is avoided due to thermal expansion, and product reliability and production efficiency are improved.
Smart Images
Figure CN222363037U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of automobile accessories, in particular to an oil pan sealing structure. Background Art
[0002] With the development of economy, people are pursuing higher and higher quality of automobiles. At present, the oil pans on traditional powertrains are mostly made of metal products, which are costly and heavy, and can no longer meet the current requirements of increasing economy, miniaturization and lightness. The industry leaders at the forefront have gradually replaced metal products with plastics to achieve the purpose of lightness and low cost. However, since the part requires sealing performance, after the metal bushing is pressed into the oil pan, due to the different thermal expansion coefficients of plastic parts and metal parts, the sealing performance of the pressed part will be greatly reduced after the product has been working for a long time, so there is a great risk of oil leakage.
[0003] The oil drain port of the oil drain plug installed on the existing automobile plastic oil pan has a sealing problem. In order to solve the sealing problem, some processes inject a metal bushing into an integral part with the plastic part, or after the oil pan is injected, the metal bushing is implanted into the oil drain port of the oil pan by a hot pressing process to ensure the mechanical strength between the two and reduce the internal stress between the two. However, ensuring the mechanical strength cannot solve the sealing problem, and the above two processes will increase the production steps and reduce the production efficiency. Utility Model Content
[0004] In view of the above technical problems existing in the prior art, the embodiments of the utility model provide an oil pan sealing structure which has reliable process, convenient installation, low cost and excellent sealing performance.
[0005] An oil pan sealing structure provided by an embodiment of the utility model comprises an oil pan provided with an oil drain port and an oil drain plug sealingly mounted to the oil drain port, wherein the oil pan and the oil drain plug are both made of thermoplastic plastic material; a limiting protrusion is arranged on the outer periphery of the outer end surface of the oil drain plug, and a pre-tightening boss and a limiting boss are arranged on the outer end surface of the oil drain port, the pre-tightening boss and the limiting boss are arranged at intervals to form a limiting groove therebetween for the limiting protrusion to be inserted into.
[0006] Optionally, the inner wall of the oil drain port is provided with a threaded hole, and the outer wall of the oil drain plug is provided with a threaded groove matching the threaded hole. The oil drain plug is screwed together with the oil drain port via the threaded hole and the threaded groove, and an O-ring is provided between the outer wall of the oil drain plug and the inner wall of the oil drain port.
[0007] Optionally, the pre-tightening boss, the limiting groove and the limiting boss are sequentially arranged along the tightening direction of the oil drain plug, and the pre-tightening boss is provided with a guiding inclined surface which gradually rises toward the direction of the limiting groove.
[0008] Optionally, a guide groove for guiding the screw thread to enter is formed at the entrance end of the screw groove.
[0009] Optionally, the outer side wall of the oil drain plug is provided with an annular groove for mounting the O-ring.
[0010] Optionally, the O-ring is made of rubber.
[0011] Optionally, a hexagonal mounting hole for cooperating with a mounting tool is provided at the center of the outer end surface of the oil drain plug.
[0012] The embodiments of the utility model have the following beneficial effects: the oil pan and the oil drain plug are both made of thermoplastic plastic, which can effectively reduce the weight, can be mass-produced through molds, have excellent product consistency, and can significantly reduce the cost of raw materials; the mass production of the oil pan does not require insert injection molding or hot pressing processes, which can effectively reduce the process cost; a limiting structure is provided between the outer end faces of the oil drain plug and the oil drain port, which can be installed without using a torque tool, is simple to install and can effectively prevent the oil drain plug from loosening, and can also prevent the sealing effect from being destroyed due to improper operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.
[0014] Figure 1 This is a schematic diagram of the exploded state of an embodiment of the utility model;
[0015] Figure 2 This is a schematic structural diagram of the outer end surface of the oil drain plug in an embodiment of the utility model;
[0016] Figure 3 It is a side view of the oil drain plug in the embodiment of the utility model;
[0017] Figure 4 This is a schematic structural diagram of the outer end surface of the oil drain port in an embodiment of the utility model;
[0018] Figure 5 This is a schematic diagram of the assembly state of the oil drain plug in the embodiment of the utility model;
[0019] The numbers in the figure represent:
[0020] 1. Oil pan; 11. Oil drain port; 12. Screw thread; 13. Preload boss; 14. Limit boss; 15. Limit groove; 2. Oil drain plug; 21. Screw groove; 22. Guide groove; 23. Annular groove; 24. Limiting convex block; 25. Hexagon socket mounting hole; 3. O-ring. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model.
[0022] See also Figure 1-Figure 5 As shown, the embodiment of the utility model provides an oil pan sealing structure, including an oil pan 1 and an oil drain plug 2, both of which are made of thermoplastic plastic material, and an oil drain port 11 is provided on the oil pan 1, and the oil drain plug 2 is sealed and installed to the oil drain port 11. Specifically, the embodiment of the utility model is provided with a screw thread 12 on the inner side wall of the oil drain port 11, and the outer side wall of the oil drain plug 2 is provided with a screw groove 21 matching the screw thread 12, and the oil drain plug 2 is screwed with the oil drain port 11 through the screw thread 12 and the screw groove 21; in order to facilitate the screw thread 12 and the screw groove 21, a guide groove 22 for guiding the screw thread 12 to enter can be formed at the entrance end of the screw groove 21. In order to ensure the sealing between the oil drain plug 2 and the oil drain port 11, the embodiment of the utility model is also provided with an O-ring 3 between the outer side wall of the oil drain plug 2 and the inner side wall of the oil drain port 11, and the outer side wall of the oil drain plug 2 is provided with an annular groove 23 for installing the O-ring 3. The material of the O-ring 3 is preferably rubber, which can withstand a high temperature of more than 200° C. for a short time, and is in close contact with the inner wall of the oil drain port 11, so as to have good sealing performance.
[0023] A limiting protrusion 24 is provided on the outer periphery of the outer end surface of the drain plug 2, and a pre-tightening boss 13 and a limiting boss 14 are provided on the outer end surface of the drain port 11. The pre-tightening boss 13 and the limiting boss 14 are arranged at intervals, so that a limiting groove 15 for the limiting protrusion 24 to be inserted can be formed between the two. When the drain plug 2 is screwed into the drain port 11, the limiting protrusion 24 can be inserted into the limiting groove 15 under the action of external force, thereby limiting the drain plug 2. On the one hand, it can prevent the drain plug 2 from being over-screwed in the forward direction and thus destroying the sealing effect, and on the other hand, it can also prevent the drain plug 2 from being loosened due to reverse rotation under vibration and the like.
[0024] Specifically, the pre-tightening boss 13, the limiting groove 15, and the limiting boss 14 are sequentially arranged along the tightening direction of the drain plug 2. For example, the drain plug 2 in the embodiment of the utility model is tightened in the clockwise direction and screwed out in the counterclockwise direction. Then, the pre-tightening boss 13, the limiting groove 15, and the limiting boss 14 are sequentially arranged in the clockwise direction, so that when the drain plug 2 is tightened in the forward direction, the limiting projection 24 can first pass through the pre-tightening boss 13, then enter the limiting groove 15, and abut against the limiting boss 14 for limiting. The pre-tightening boss 13 is provided with a guide inclined surface that gradually rises in the direction of the limiting groove 15. When the drain plug 2 is tightened in the forward direction, the limiting projection 24 can gradually rise along the guide inclined surface so as to enter the limiting groove 15.
[0025] In addition, in order to facilitate the installation and removal of the drain plug 2, the embodiment of the utility model is provided with a hexagonal mounting hole 25 for cooperating with the installation tool at the center of the outer end surface of the drain plug 2. When installing the drain plug 2, insert the installation tool into the hexagonal mounting hole 25, align the guide groove 22 of the drain plug 2 with the screw thread 12 of the drain port 11, and then screw the installation tool clockwise; the limiting protrusion 24 on the drain plug 2 first contacts the pre-tightening boss 13, and then continue to screw. The limiting protrusion 24 can be gradually raised along the guiding inclined surface of the pre-tightening boss 13 under the action of external force until it enters the limiting groove 15 and abuts against the limiting boss 14 for limiting, and the installation is completed. At this time, the thread 12 and the thread groove 21 are tightly matched to form an axial anti-loosening structure; the limiting protrusion 24 is inserted between the pre-tightening boss 13 and the limiting boss 14 to form a radial anti-loosening structure; the O-ring 3 is in close contact with the outer wall of the drain plug 2 and the inner wall of the drain port 11 to ensure the sealing between the two. Due to the existence of the axial and radial double anti-loosening structure, after the drain plug 2 and the oil pan 1 are assembled, it cannot fall off naturally without external force, and the drain plug 2 must be removed by twisting it counterclockwise with the installation tool.
[0026] The embodiment of the utility model has a simple structure and light weight, and can be applied to all similar sealing structures, not just the oil pan 1. From the injection molding process to the processing process to the assembly process, existing mature technologies are adopted without additional requirements, so the cost is low, the production efficiency is high, and the reliability requirements of the product can be met, which greatly improves the competitiveness of the enterprise and the product.
[0027] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present invention. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. An oil pan sealing structure, comprising an oil pan provided with an oil drain port and an oil drain plug sealingly mounted to the oil drain port, characterized in that: The oil pan and the oil drain plug are both made of thermoplastic plastic; a limiting protrusion is arranged on the outer periphery of the outer end surface of the oil drain plug, and a pre-tightening boss and a limiting boss are arranged on the outer end surface of the oil drain port, and the pre-tightening boss and the limiting boss are arranged at intervals to form a limiting groove therebetween for the limiting protrusion to be inserted into.
2. The oil pan sealing structure according to claim 1, characterized in that: The inner wall of the oil drain port is provided with a threaded thread, and the outer wall of the oil drain plug is provided with a threaded groove matching the threaded thread. The oil drain plug is screwed together with the oil drain port through the threaded thread and the threaded groove, and an O-ring is provided between the outer wall of the oil drain plug and the inner wall of the oil drain port.
3. The oil pan sealing structure according to claim 2, characterized in that: The pre-tightening boss, the limiting groove and the limiting boss are arranged in sequence along the tightening direction of the oil drain plug, and the pre-tightening boss is provided with a guiding inclined surface which gradually rises toward the direction of the limiting groove.
4. The oil pan sealing structure according to claim 2, characterized in that: A guide groove for guiding the screw thread to enter is formed at the inlet end of the screw groove.
5. The oil pan sealing structure according to claim 2, characterized in that: The outer side wall of the oil drain plug is provided with an annular groove for installing the O-ring.
6. The oil pan sealing structure according to claim 2, characterized in that: The material of the O-ring is rubber.
7. The oil pan sealing structure according to claim 1, characterized in that: A hexagonal mounting hole for matching with an installation tool is arranged at the center of the outer end surface of the oil drain plug.