Oil drain bolt anti-loosening structure and engine

Abstract

The embodiment of the utility model provides a kind of oil drain bolt anti-loose structure and engine, it is related to engine parts field.The oil drain bolt anti-loose structure of engine includes oil pan, oil drain bolt and elastic piece.The bottom of oil pan is provided with an oil drain bolt hole.Oil drain bolt is screwed in oil drain bolt hole.Elastic piece is contained in oil drain bolt hole.The one end of elastic piece is abutted to the bottom of oil drain bolt hole, and the other end is abutted to oil drain bolt.Oil drain bolt is screwed in the case of oil drain bolt hole, and elastic piece is in compression state.The utility model can avoid that threaded connection is ineffective due to engine vibration, provide stable threaded anti-loose effect, avoid oil leakage and oil pollution.

Description

Technical Field

[0001] This utility model relates to the field of engine component technology, and more specifically, to an oil drain bolt anti-loosening structure and an engine. Background Technology

[0002] In the engine's lubrication system, the oil pan is a crucial component for storing engine oil. To ensure easy oil changes and maintenance, the bottom of the oil pan typically has a drain hole, which is sealed and tightened with a drain plug. During engine operation, continuous and intense vibrations can easily cause the traditional drain plug to loosen, leading to oil leaks. In severe cases, this can damage the engine due to insufficient lubrication.

[0003] In related technologies, to prevent the drain plug from loosening, elastic washers are typically used to generate friction through their elasticity; alternatively, thread-locking adhesive is applied to the bolt threads, utilizing the adhesive's bonding force to prevent loosening. However, during tightening, elastic washers may excessively compress or cut the mating gasket, causing damage to the gasket and leading to seal failure and oil leakage. After applying thread-locking adhesive, adhesive fragments can easily detach and mix into the engine oil during bolt installation and removal, causing oil contamination and affecting normal engine lubrication. Utility Model Content

[0004] The purpose of this utility model is to provide an oil drain bolt anti-loosening structure and an engine, which can prevent engine vibration from causing threaded connection failure, provide a stable thread anti-loosening effect, and prevent oil leakage and oil contamination.

[0005] The embodiments of this utility model can be implemented as follows: In a first aspect, this utility model provides an anti-loosening structure for an oil drain bolt, comprising: The oil pan has a drain bolt hole at the bottom. A drain bolt, used to be screwed into the drain bolt hole; An elastic element is housed within the drain bolt hole. One end of the elastic element abuts against the bottom of the drain bolt hole, and the other end abuts against the drain bolt. When the drain bolt is screwed into the drain bolt hole, the elastic element is in a compressed state.

[0006] In an optional embodiment, the elastic element is a helical spring, and the extension direction of the helical spring is arranged along the axial direction of the drain bolt hole.

[0007] In an optional embodiment, the drain bolt hole includes a threaded section and a receiving cavity connected in sequence, the receiving cavity being used to accommodate and radially limit the helical spring.

[0008] In an optional embodiment, the inner diameter of the accommodating cavity is adapted to or clearance-fitted with the outer diameter of the spring.

[0009] In an optional embodiment, an oil chamber is provided inside the oil pan, and the oil chamber is connected to the outside through the drain bolt hole. A through hole communicating with the oil chamber is provided on the side wall of the drain bolt hole.

[0010] In an optional embodiment, the through hole is disposed on the side wall of the accommodating cavity.

[0011] In an optional embodiment, the end of the drain bolt that is screwed into the drain bolt hole is fitted with a magnetic element.

[0012] In an optional embodiment, a sealing washer is also included, which is fitted onto the drain bolt and located between the head of the drain bolt and the end face of the drain bolt hole in the oil pan.

[0013] In an optional embodiment, the sealing gasket is a fluororubber gasket.

[0014] Secondly, this utility model provides an engine, including the oil drain bolt anti-loosening structure described in any of the foregoing embodiments.

[0015] The beneficial effects of the drain bolt anti-loosening structure and engine provided by this utility model embodiment include: This utility model's drain plug anti-loosening structure includes an oil pan, a drain plug, and an elastic element. A drain plug hole is provided at the bottom of the oil pan. The drain plug is screwed into the drain plug hole. The elastic element is housed within the drain plug hole. One end of the elastic element abuts against the bottom of the drain plug hole, and the other end abuts against the drain plug. When the drain plug is screwed into the drain plug hole, the elastic element is in a compressed state. By providing a pre-compressed elastic element within the drain plug hole, the continuous reverse preload generated by the elastic element counteracts the loosening torque caused by engine vibration, achieving a reliable anti-loosening effect and avoiding the risk of oil leakage caused by a loose drain plug, greatly improving the reliability and safety of engine operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the anti-loosening structure for the drain bolt provided in this embodiment.

[0018] Icons: 100 - Anti-loosening structure for drain bolt; 10 - Oil pan; 11 - Oil cavity; 12 - Drain bolt hole; 121 - Through hole; 20 - Drain bolt; 21 - Sealing gasket; 22 - Magnetic component; 30 - Helical spring. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0025] The following describes in detail the overall structure, working principle, and technical effects of the oil release bolt anti-loosening structure provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0026] Please refer to Figure 1The oil drain bolt anti-loosening structure 100 provided by this utility model is applied to the engine lubrication system, specifically to the oil drain hole of the engine oil pan 10. This structure aims to provide a continuous, reliable, and pollution-free anti-loosening solution for the oil drain bolt 20 under long-term vibration conditions of the engine.

[0027] The oil drain plug anti-loosening structure 100 of this engine includes an oil pan 10, a drain plug 20, and an elastic element. A drain plug hole 12 is provided at the bottom of the oil pan 10. The drain plug 20 is screwed into the drain plug hole 12. The elastic element is accommodated within the drain plug hole 12. One end of the elastic element abuts against the bottom of the drain plug hole 12, and the other end abuts against the drain plug 20. When the drain plug 20 is screwed into the drain plug hole 12, the elastic element is in a compressed state.

[0028] By setting a pre-compressed elastic element structure, a reverse preload force can be generated that continuously acts on the drain bolt 20. This preload force can counteract the loosening energy transmitted from engine vibration to the threaded pair structure, thereby achieving the effect of preventing the drain bolt 20 from loosening or falling off due to vibration, ensuring the long-term reliability of the seal and preventing oil leakage.

[0029] The drain plug hole 12 serves as a channel for oil to flow out. By placing the drain plug hole 12 at the bottom of the oil pan 10, the oil can be drained from the bottom under its own weight after the drain plug 20 is unscrewed, thus achieving engine oil replacement.

[0030] In this embodiment, the elastic element is a helical spring 30. The helical spring 30 extends along the axial direction of the drain bolt hole 12. Specifically, the helical spring 30 is made of spring steel with high fatigue strength, good elasticity, and stable mechanical properties, such as 65Mn.

[0031] Specifically, the drain bolt hole 12 includes a threaded section and a receiving cavity connected in sequence. The receiving cavity is used to accommodate and radially limit the helical spring 30. The threaded section is used to engage with the screw portion of the drain bolt 20, providing the necessary tightening force. The threaded section has internal threads whose dimensions and pitch precisely match the external threads of the drain bolt 20, ensuring reliable engagement. When the drain bolt 20 is screwed in, the threaded section bears axial tensile force and converts this force into a clamping force on the sealing washer 21, while simultaneously transmitting a compressive force on the helical spring 30 through the end of the drain bolt 20.

[0032] Furthermore, the receiving cavity is a cylindrical cavity with a diameter larger than that of the threaded section, and its inner diameter is adapted to the outer diameter of the helical spring 30. Specifically, the inner diameter of the receiving cavity is the same as or has a clearance fit with the outer diameter of the spring. This fitting structure allows the inner wall of the receiving cavity to provide sufficient radial constraint on the helical spring 30, preventing the spring from bending or shifting during compression and ensuring that the spring force is always transmitted axially.

[0033] In this embodiment, the axial depth of the accommodating cavity is greater than the length of the coil spring 30 in the fully compressed state. This provides sufficient space for the compression stroke of the coil spring 30, while ensuring that the end of the coil spring 30 can still maintain contact with the bottom of the accommodating cavity when the drain bolt 20 is fully tightened.

[0034] Specifically, an oil chamber 11 is provided inside the oil pan 10. The oil chamber 11 communicates with the outside through the drain bolt hole 12. A through hole 121 communicating with the oil chamber 11 is provided on the side wall of the drain bolt hole 12. The oil chamber 11 is used to store engine oil. Under normal operating conditions, the drain bolt 20 is screwed into the drain bolt hole 12, and the sealing washer 21 on it is pressed between the head of the drain bolt 20 and the mounting surface of the oil pan 10, forming an effective seal, thereby blocking the communication between the oil chamber 11 and the outside and preventing engine oil leakage. When it is necessary to change the engine oil, the drain bolt 20 is unscrewed, and the oil chamber 11 communicates with the outside through the drain bolt hole 12. The engine oil stored in the oil chamber 11 flows into the receiving cavity at the bottom of the drain bolt hole 12 under the action of gravity, and then is discharged to the outside through the channel of the drain bolt hole 12.

[0035] In this embodiment, specifically, the through hole 121 is disposed on the side wall of the accommodating cavity. It is understood that the axial direction of the drain plug hole 12 is perpendicular to the axial direction of the through hole 121. When the engine is running normally and the drain plug 20 is tightened, the oil pressure in the oil chamber 11 acts on the drain plug hole 12 area through the through hole 121 on the side wall. This reduces the static pressure difference acting on both ends of the elastic element, preventing the elastic element from undergoing slight compression or stress creep under long-term static pressure, thus helping to maintain its long-term elasticity and fatigue life. When an oil change is required, the drain plug 20 is unscrewed, and the oil chamber 11 communicates with the drain plug hole 12 through the through hole 121. By disposing of the through hole 121 on the side wall of the drain plug hole 12, the pressure on the elastic element is reduced, preventing the elastic element from being ejected from the drain plug hole 12 under the action of oil flow.

[0036] Furthermore, a magnetic element 22 is embedded in the end of the drain plug 20 that screws into the drain plug hole 12. Specifically, the magnetic element 22 is preferably a permanent magnet, which is firmly embedded in a blind hole pre-machined at the end of the drain plug 20 by interference fit or bonding. Under normal engine operation, the magnetic element 22 is directly immersed in the engine oil, which can continuously adsorb ferromagnetic wear debris generated by friction between internal engine parts, thereby reducing the impurity content in the engine oil, reducing abrasive wear on the moving parts of the engine, and thus extending the service life of the engine.

[0037] Furthermore, during maintenance disassembly, when the drain bolt 20 is unscrewed from the drain bolt hole 12, the magnetic component 22, being axially adjacent to the elastic component housed within the hole and subject to magnetic force, reliably attracts the elastic component to its end using its magnetic force, and simultaneously pulls it out of the hole. This solves the problem of small elastic components being difficult to remove in confined spaces, facilitating maintenance operations and preventing the elastic component from falling, being lost, or being improperly installed during disassembly, thus improving the convenience and reliability of maintenance.

[0038] Furthermore, the drain plug anti-loosening structure 100 also includes a sealing washer 21. The sealing washer 21 is fitted onto the drain plug 20 and is located between the head of the drain plug 20 and the end face of the drain plug hole 12 of the oil pan 10. When the drain plug 20 is tightened, its head presses the sealing washer 21 against the flat surface at the bottom of the oil pan 10, thereby causing the washer to undergo elastic deformation, thus forming a reliable sealing interface and effectively preventing oil leakage from this mating surface.

[0039] Understandably, the structure of this utility model decouples the anti-loosening function from the sealing function. Traditional spring washers, while providing anti-loosening functionality, have sharp edges that can easily cut or create uneven indentations on the sealing washer 21, leading to seal failure. In this structure, however, the anti-loosening function is provided by an elastic element located deep within the bolt hole, while the sealing function is independently performed by the sealing washer 21. The two functions do not interfere with each other structurally or functionally.

[0040] Specifically, the sealing gasket 21 is preferably made of a material with good oil resistance, high temperature resistance and elastic recovery ability, such as a fluororubber gasket, so as to ensure that the sealing gasket 21 can maintain stable sealing performance and service life in the engine oil environment and operating temperature for a long time.

[0041] The beneficial effects of the drain bolt anti-loosening structure 100 and the engine provided in this embodiment of the utility model include: The oil drain bolt anti-loosening structure 100 of this utility model includes an oil pan 10, an oil drain bolt 20, and an elastic element. An oil drain bolt hole 12 is provided at the bottom of the oil pan 10. The oil drain bolt 20 is screwed into the oil drain bolt hole 12. The elastic element is accommodated within the oil drain bolt hole 12. One end of the elastic element abuts against the bottom of the oil drain bolt hole 12, and the other end abuts against the oil drain bolt 20. When the oil drain bolt 20 is screwed into the oil drain bolt hole 12, the elastic element is in a compressed state. By providing a pre-compressed elastic element within the oil drain bolt hole 12, the continuous reverse pre-tightening force generated by it counteracts the loosening torque caused by engine vibration, achieving a reliable anti-loosening effect and avoiding the risk of oil leakage caused by a loose oil drain bolt 20, greatly improving the reliability and safety of engine operation.

[0042] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A structure for preventing loosening of an oil drain bolt, characterized in that, include: The oil pan has a drain bolt hole at the bottom. A drain bolt, used to be screwed into the drain bolt hole; An elastic element is housed within the drain bolt hole. One end of the elastic element abuts against the bottom of the drain bolt hole, and the other end abuts against the drain bolt. When the drain bolt is screwed into the drain bolt hole, the elastic element is in a compressed state.

2. The anti-loosening structure for the drain bolt according to claim 1, characterized in that, The elastic element is a helical spring, and the extension direction of the helical spring is arranged along the axial direction of the drain bolt hole.

3. The anti-loosening structure for the drain bolt according to claim 2, characterized in that, The drain bolt hole includes a threaded section and a receiving cavity connected in sequence. The receiving cavity is used to accommodate and radially limit the helical spring.

4. The anti-loosening structure for the drain bolt according to claim 3, characterized in that, The inner diameter of the accommodating cavity is the same as or has a clearance fit with the outer diameter of the spring.

5. The anti-loosening structure for the drain bolt according to claim 3, characterized in that, The oil pan is provided with an oil cavity, which is connected to the outside through the drain bolt hole. The side wall of the drain bolt hole is provided with a through hole that communicates with the oil cavity.

6. The anti-loosening structure for the drain bolt according to claim 5, characterized in that, The through hole is provided on the side wall of the accommodating cavity.

7. The anti-loosening structure for the drain bolt according to claim 1, characterized in that, The end of the drain bolt that is screwed into the drain bolt hole is fitted with a magnetic element.

8. The anti-loosening structure for the drain bolt according to claim 1, characterized in that, It also includes a sealing gasket, which is fitted onto the drain bolt and located between the head of the drain bolt and the end face of the drain bolt hole in the oil pan.

9. The anti-loosening structure for the drain bolt according to claim 8, characterized in that, The sealing gasket is a fluororubber gasket.

10. An engine, characterized in that, Includes the oil drain bolt anti-loosening structure as described in any one of claims 1-9.

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