Oil port anti-falling structure and transmission
By using a combination of anti-loosening blocks and elastic retaining edges at the oil port, the problem of the screw plug loosening or falling off under vibration and impact is solved, achieving a stable seal at the oil port, avoiding oil leakage and environmental pollution, and improving the operational stability and maintenance efficiency of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HYCET TRANSMISSION SYST (JIANGSU) CO LTD
- Filing Date
- 2025-06-20
- Publication Date
- 2026-04-21
AI Technical Summary
The plugs in traditional threaded connections are prone to loosening or falling off under vibration and impact, leading to oil leakage, waste, and environmental pollution.
It adopts an anti-detachment structure, including an anti-detachment block and an elastic retaining edge. The elastic retaining edge is fixed inside the anti-detachment edge by deformation and rebound, preventing the screw plug from rotating in the opposite direction. Combined with the guide edge and sealing element, it ensures sealing and stability.
It effectively prevents the plug from loosening or falling off under vibration and impact, keeps the oil port sealed, avoids oil leakage, reduces environmental pollution and equipment failure, and improves equipment operation stability and maintenance efficiency.
Smart Images
Figure CN224150143U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of transmission technology, and more specifically, it relates to an oil port anti-detachment structure and a transmission. Background Technology
[0002] In industrial production, the stable operation of machinery, hydraulic systems, and various containers is crucial. To ensure the normal circulation and maintenance of internal oil, oil ports are typically installed at critical locations and sealed with screw plugs. This design allows workers to quickly and easily drain internal oil during equipment maintenance, repair, or oil replacement.
[0003] Traditional oil ports and plugs typically use a simple threaded connection. This connection method is simple in structure and has low manufacturing and installation costs. Specifically, the plug body is directly threaded into the oil port. During installation, the plug is tightened manually or with tools to ensure a tight fit between the threads, relying on the friction between the threads to achieve fixation and sealing. When the equipment is stationary, this connection method can meet basic sealing requirements and ensure that oil leakage does not occur.
[0004] However, in actual operation, mechanical equipment often operates under complex and ever-changing conditions. Taking heavy construction machinery as an example, excavators experience frequent starts, stops, and reversals in their hydraulic systems during excavation, generating strong hydraulic shocks. Loaders, when traveling on bumpy construction sites, are constantly subjected to vibration and impact. Similarly, large mechanical equipment on industrial production lines, such as crushers and mixers, also experience continuous vibrations due to their own mechanical movement and load variations during operation. In such an environment filled with vibration and impact, traditional screw plugs that rely solely on thread friction for fixation are easily loosened or even detached due to reverse rotation.
[0005] Once the plug detaches from the oil port, it will trigger a series of serious consequences. First, the internal oil will leak uncontrollably, causing a large amount of oil waste and increasing the company's operating costs. Second, the leaked oil will pollute the working environment. In factory workshops, oil will drip onto the floor, not only affecting cleanliness but also increasing the safety hazard of workers slipping and falling. In field operations, leaked oil will seep into the soil, damaging the surrounding ecological environment. In addition, oil leaks may also lead to insufficient lubrication inside the equipment, a drop in hydraulic system pressure, and thus affect the normal operation of the equipment, even causing equipment failure, production stoppage, and huge economic losses to the company. Utility Model Content
[0006] The purpose of this utility model is to provide an oil port anti-detachment structure, which aims to solve the problem of the screw plug loosening or even falling off due to reverse rotation, resulting in internal oil leakage, oil waste and pollution of the working environment.
[0007] To achieve the above objectives, the technical solution adopted by this utility model is: to provide an oil port anti-detachment structure, comprising:
[0008] A housing, wherein an oil port is provided on the housing;
[0009] A screw plug body, the screw plug body being threadedly installed inside the oil port;
[0010] The anti-detachment structure includes an anti-detachment block and an elastic retaining edge. The anti-detachment block is disposed on the outer surface of the housing and located on one side of the oil port. The anti-detachment block is provided with an anti-detachment edge extending towards the oil port. The elastic retaining edge is disposed on one side of the outer end of the screw plug body.
[0011] As the screw plug body is screwed into the oil port, the free end of the elastic retaining edge is squeezed inward by the anti-detachment block and springs back into the anti-detachment edge to prevent the screw plug body from coming out of the oil port in the opposite direction.
[0012] In one possible implementation, the anti-disengagement block has a groove on the side near the oil port that is adapted to the free end of the elastic retaining edge. The groove forms the anti-disengagement edge on the side near the screw plug body in the screwing direction. The groove and the elastic retaining edge form a double anti-disengagement mechanism that can resist vibration and impact, and can still prevent disengagement even if the threads are worn.
[0013] In one possible implementation, a guide edge is provided on the side of the anti-detachment block near the oil port. This guide edge is positioned on the front side of the retaining groove along the screw-in direction of the plug body, and the distance between the guide edge and the oil port decreases gradually along the screw-in direction. This gradually narrowing guide edge structure guides the free end of the elastic retaining edge, causing it to gradually compress towards the plug body and smoothly slide into the retaining groove. This avoids deformation and failure of the retaining edge due to installation deviations, significantly improving installation efficiency and structural adaptability. The dynamic guidance of the guide edge achieves efficient cooperation between the anti-detachment block and the elastic retaining edge, ensuring the stability and reusability of the retaining structure.
[0014] In one possible implementation, the free end of the elastic retaining edge extends away from the oil port. This allows for precise guidance of the free end of the elastic retaining edge to align with the retaining groove along the screw thread trajectory of the plug body, preventing engagement failure due to circumferential offset and further improving installation efficiency and the reliability of the anti-detachment structure.
[0015] In one possible implementation, the plug body includes a threaded end, a smooth section, and a nut end arranged sequentially from the inside to the outside. The oil port includes a threaded hole and a smooth hole arranged sequentially from the inside to the outside. The threaded end is adapted to the threaded hole, and an elastic retaining flange is disposed at the nut end. A sealing gap is formed between the smooth hole and the smooth section, and a sealing element is disposed within the sealing gap. The threaded end has a small engagement amount, and the plug body can be removed by overcoming the anti-disengagement torque of the elastic retaining flange. Combined with the reusable nature of the sealing element, this significantly improves after-sales maintenance efficiency and reduces thread damage caused by frequent disassembly.
[0016] In one possible implementation, the sealing element includes:
[0017] A sealing sleeve is fitted onto the smooth rod section. The outer wall of the sealing sleeve is provided with multiple sealing rings arranged at axial intervals. The outer circumferential surface of each sealing ring is interference-fitted with the inner circumferential wall of the smooth hole. Even if a single sealing ring has a minute gap, the other sealing rings can prevent oil leakage, forming a redundant sealing structure and significantly improving sealing reliability.
[0018] In one possible implementation, the inner wall of the sealing sleeve is provided with a plurality of anti-slip rings arranged at intervals along the axial direction, and the anti-slip rings are interference-fitted with the polished rod section. This prevents the sealing sleeve from moving axially along the polished rod section. Especially when the equipment vibrates or the oil pressure fluctuates, the elastic deformation of the anti-slip rings can maintain the clamping force, preventing the sealing sleeve from shifting and causing misalignment between the sealing ring and the polished hole, thus ensuring the stability of the multi-layer sealing structure.
[0019] In one possible implementation, the housing is provided with a mounting boss, the oil port is located on the mounting boss, and the anti-disengagement block is disposed on the mounting boss. The relative positional accuracy of the two components is ensured through one-time molding, preventing jamming failure due to positional deviations. Simultaneously, the height of the mounting boss can control the end-face fit of the screw plug after screwing it in, ensuring uniform compression of the sealing sleeve and improving sealing reliability.
[0020] In one possible implementation, the plug body is made of plastic. Plastic has high plasticity, making it easy to integrate elastic retaining edges onto the plug body. Plastic is a relatively low-cost material, which can reduce production costs and improve production efficiency while ensuring product performance. Furthermore, plastic plugs have good chemical stability, can adapt to various chemical environments, and are not easily corroded, thus extending the product's service life.
[0021] The beneficial effects of the oil port anti-detachment structure provided by this utility model are as follows: Compared with the prior art, when the screw plug body is screwed into the oil port of the housing, the elastic retaining edge on one side of the outer end of the screw plug body will contact the anti-detachment block on the oil port side of the outer surface of the housing as it is screwed in. The anti-detachment block will exert a squeezing effect on the free end of the elastic retaining edge, causing the elastic retaining edge to deform inward. As the screw plug body continues to screw in, when the elastic retaining edge passes the anti-detachment edge, it will spring back and lock into the anti-detachment edge. When the equipment operation generates external forces such as vibration, attempting to make the screw plug body rotate in the opposite direction and detach from the oil port, the elastic retaining edge locked in the anti-detachment edge will fit tightly with the anti-detachment edge. Relying on the elastic deformation recovery force of the elastic retaining edge and the blocking effect of the anti-detachment edge, the screw plug body is effectively prevented from rotating in the opposite direction, thereby preventing the screw plug body from loosening or falling off. Even when the equipment is under harsh operating conditions such as vibration and impact, the oil port can still remain sealed, eliminating the risk of internal oil leakage at the source, avoiding oil waste, and also eliminating the hidden danger of oil leakage causing pollution to the working environment.
[0022] This utility model also provides a transmission, including the aforementioned oil port anti-detachment structure.
[0023] The beneficial effect of the transmission provided by this utility model is that, compared with the prior art, the transmission includes the above-mentioned oil port anti-detachment structure, and therefore has the same beneficial effect as the oil port anti-detachment structure, which will not be described in detail here. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of an oil port anti-detachment structure provided in an embodiment of the present utility model;
[0026] Figure 2 for Figure 1 Sectional view along the middle AA;
[0027] Figure 3 for Figure 1 A magnified view of a section at point B in the middle;
[0028] Figure 4 for Figure 2 A magnified view of a section at point C.
[0029] In the picture:
[0030] 100. Housing; 110. Oil port; 111. Threaded hole; 112. Smooth hole; 120. Anti-detachment block; 121. Anti-detachment edge; 122. Slot; 123. Guide edge; 130. Mounting boss;
[0031] 200. Plug body; 201. Threaded end; 202. Polished rod section; 203. Nut end; 210. Elastic retaining edge; 220. Clearance groove;
[0032] 300. Sealing sleeve; 310. Sealing ring; 320. Anti-slip ring. Detailed Implementation
[0033] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0034] Unless otherwise explicitly specified, the use of terms such as "first," "second," or "third" is intended to distinguish different objects, not to describe a specific order.
[0035] Unless otherwise expressly defined, the use of directional terms such as “center,” “lateral,” “longitudinal,” “horizontal,” “vertical,” “top,” “bottom,” “inner,” “outer,” “upper,” “lower,” “front,” “back,” “left,” “right,” “clockwise,” “counterclockwise,” “high,” and “low” to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the present invention and simplifying the description. It is not intended to 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 limiting the specific protection scope of the present invention.
[0036] Please see Figures 1 to 4 The present invention provides a method for preventing oil port detachment. An oil port detachment prevention structure includes a housing 100, a plug body 200, and an anti-detachment structure. The housing 100 has an oil port 110; the plug body 200 is threaded into the oil port 110; the anti-detachment structure includes an anti-detachment block 120 and an elastic retaining edge 210. The anti-detachment block 120 is disposed on the outer surface of the housing 100 and located on one side of the oil port 110. The anti-detachment block 120 has an anti-detachment edge 121 extending towards the oil port 110. The elastic retaining edge 210 is disposed on one side of the outer end of the plug body 200. As the plug body 200 is screwed into the oil port 110, the free end of the elastic retaining edge 210 is squeezed inward by the anti-detachment block 120 and springs back to retain itself within the anti-detachment edge 121, preventing the plug body 200 from detaching from the oil port 110 in the opposite direction.
[0037] This utility model provides an oil port anti-detachment structure. Compared with the prior art, when the screw plug body 200 is screwed into the oil port 110 of the housing 100, the elastic retaining edge 210 on one side of the outer end of the screw plug body 200 will contact the anti-detachment block 120 on the oil port 110 side of the outer surface of the housing 100 as it is screwed in. The anti-detachment block 120 will exert a squeezing effect on the free end of the elastic retaining edge 210, causing the elastic retaining edge 210 to deform inward. As the screw plug body 200 continues to screw in, when the elastic retaining edge 210 passes the anti-detachment edge 121, it will spring back and lock into the anti-detachment edge 121. When the equipment operates and generates external forces such as vibration, attempting to cause the screw plug body 200 to rotate in the opposite direction and dislodge from the oil port 110, the elastic retaining edge 210, which is engaged within the anti-disengagement edge 121, will tightly engage with the anti-disengagement edge 121. Through the elastic deformation recovery force of the elastic retaining edge 210 and the blocking effect of the anti-disengagement edge 121, the reverse rotation of the screw plug body 200 is effectively prevented, thus preventing the screw plug body 200 from loosening or falling off. Even under harsh operating conditions such as vibration and impact, the oil port 110 can still maintain a sealed state, eliminating the risk of internal oil leakage at the source, avoiding oil waste, and also eliminating the potential for oil leakage to pollute the working environment.
[0038] Please see Figure 1 and Figure 3 The anti-detachment block 120 has a groove 122 on the side near the oil port 110, which is adapted to the free end of the elastic retaining edge 210. The groove 122 forms an anti-detachment edge 121 on the side near the screw plug body 200 screwing direction. The side wall of the groove 122 near the screw plug body 200 screwing direction is a vertical or steeply inclined anti-detachment edge 121, and the other side is a gently sloping mounting edge. The free end of the elastic retaining edge 210 on the outer end of the screw plug body 200 is hook-shaped or wedge-shaped, matching the shape of the groove 122.
[0039] During installation, screw the plug body 200 clockwise. The free end of the elastic retaining edge 210 slides along the outer surface of the anti-detachment block 120. During the contact with the anti-detachment block 120, it is gradually deformed due to the elasticity. After passing the anti-detachment edge 121, continue to tighten until the free end of the elastic retaining edge 210 rebounds in the retaining groove 122, so that the free end of the plug body 200 and the anti-detachment edge 121 of the retaining groove 122 are tightly fitted to form a mechanical limit.
[0040] During disassembly, if the anti-detachment edge 121 is perpendicular to the screw-in direction of the plug body 200 (i.e., the anti-detachment edge 121 and the screw-in direction of the plug body 200 are at a right angle), the elastic retaining edge 210 needs to be manually or with a tool pressed towards one side of the plug body 200 to disengage it from the anti-detachment edge 121 in the retaining groove 122. Applying force counterclockwise will disengage the elastic retaining edge 210 from the retaining groove 122, thus achieving disassembly. If the anti-detachment edge 121 is inclined at a large angle to the screw-in direction of the plug body 200 (i.e., the anti-detachment edge 121 and the screw-in direction of the plug body 200 are at an acute angle), the plug body 200 can be directly rotated in the opposite direction, and the free end of the elastic retaining edge 210 will gradually disengage from the retaining groove 122 along the inclined side of the anti-detachment edge 121.
[0041] The slot 122 and the elastic retaining edge 210 form a double anti-disengagement mechanism that can withstand vibration and impact, and can still prevent disengagement even if the threads are worn. The gentle angle of the mounting edge ensures moderate installation torque, and force can be applied to unlock it during disassembly. It can be reused multiple times.
[0042] Specifically, the screw plug body 200 is made of plastic, which can be manufactured in one piece using injection molding, meeting lightweight design requirements. Furthermore, the high plasticity of plastic facilitates the integration of elastic retaining edges 210 onto the screw plug body 200. Plastic materials are relatively inexpensive, reducing production costs and improving efficiency while ensuring product performance. In addition, plastic screw plugs possess good chemical stability, adapting to various chemical environments and resisting corrosion, thus extending product lifespan.
[0043] Please see Figure 3 The anti-detachment block 120 has a guide edge 123 on the side near the oil port 110. The guide edge 123 is located on the front side of the slot 122 along the screw-in direction of the plug body 200, and the distance between the guide edge 123 and the oil port 110 decreases along the screw-in direction of the plug body 200. During the installation of the plug body 200, the gradually narrowing guide edge 123 guides the free end of the elastic retaining edge 210, causing it to gradually compress towards the plug body 200 and smoothly slide into the slot 122. This avoids deformation and failure of the retaining edge due to installation deviation, significantly improving installation efficiency and structural adaptability.
[0044] Meanwhile, the gradient guide edge 123 can generate a pre-compression force on the elastic locking edge 210 in the initial screwing stage, causing the locking edge to enter the locking groove 122 along the preset trajectory. This reduces installation resistance while ensuring that the anti-detachment edge 121 and the anti-detachment edge 121 of the locking groove 122 are accurately aligned, further enhancing the reliability of the anti-detachment structure. It is especially suitable for installation error scenarios that may occur due to elastic deformation of plastic materials. Through the dynamic guidance of the guide edge 123, the anti-detachment block 120 and the elastic locking edge 210 are efficiently coordinated, ensuring the stability and reusability of the locking structure.
[0045] Please see Figure 3 The free end of the elastic retaining edge 210 extends away from the oil port 110. The edge of the screw plug body 200 is provided with a relief groove 220 corresponding to the position of the elastic retaining edge 210. One end of the elastic retaining edge 210 is integrally formed on the edge of the relief groove 220, and the other side extends roughly along the circumference of the screw plug body 200.
[0046] The clearance groove 220 provides ample deformation space for the elastic retaining edge 210. When the screw plug body 200 is screwed in, the free end of the elastic retaining edge 210 is squeezed inward by the anti-detachment block 120. The clearance groove 220 can effectively prevent the retaining edge from interfering with the screw plug body 200, ensuring that the elastic retaining edge 210 can be compressed radially into the clearance groove 220, reducing the risk of the elastic retaining edge 210 breaking due to hard compression, and improving the durability of the structure.
[0047] Furthermore, the structure of the elastic retaining edge 210 extending circumferentially along the screw plug body 200 allows it to form a circumferentially symmetrical fit with the guide edge 123 and the retaining groove 122 of the anti-detachment block 120 during the screwing process. Combined with the positioning function of the relief groove 220, it can accurately guide the free end of the elastic retaining edge 210 to align with the retaining groove 122 along the screw plug body 200 screwing trajectory, avoiding the failure of the retaining due to circumferential offset, and further improving the installation efficiency and the reliability of the anti-detachment structure.
[0048] The extension direction of the free end of the elastic retaining edge 210 increases the contact length between the free end of the elastic retaining edge 210 and the anti-detachment edge 121. When the elastic retaining edge 210 springs back and clamps, the limiting force distributed along the circumference is more uniform, which can effectively resist the circumferential vibration during equipment operation and prevent the screw plug body 200 from loosening due to uneven local force. At the same time, the integral molding design of the edge of the clearance groove 220 and the elastic retaining edge 210 enhances the connection strength between the elastic retaining edge 210 and the screw plug body 200, and prevents the retaining edge from falling off during long-term vibration.
[0049] Specifically, there are multiple anti-detachment blocks 120, which are evenly arranged around the oil port 110. Similarly, there are multiple elastic retaining edges 210, which are evenly arranged around the outer end of the screw plug body 200. The multiple anti-detachment blocks 120 and multiple elastic retaining edges 210 correspond one-to-one. The anti-detachment performance is systematically improved through structural symmetry and multi-point limiting.
[0050] Specifically, the multiple circumferentially distributed anti-detachment blocks 120 and elastic retaining edges 210, when the screw plug body 200 is screwed in, ensure that the locking forces are symmetrically distributed circumferentially. This effectively counteracts vibration torques in different directions during equipment operation, preventing the screw plug body 200 from swaying or loosening due to uneven local stress. This design is suitable for stable sealing under high vibration conditions. The multi-point locking structure transforms the anti-detachment torque from being borne by a single locking point to being borne by multiple locking points in a coordinated manner. This reduces the peak stress at a single locking point, decreases the risk of fatigue damage to the elastic retaining edges 210 due to overload, and significantly improves the reliability of the anti-detachment structure. Furthermore, the probability of simultaneous failure at multiple locking points is much lower than that at a single locking point.
[0051] Please see Figure 2 The plug body 200 includes a threaded end 201, a smooth rod section 202, and a nut end 203 arranged sequentially from the inside to the outside. The oil port 110 includes a threaded hole 111 and a smooth hole 112 arranged sequentially from the inside to the outside. The threaded end 201 is adapted to the threaded hole 111 and only needs to be screwed in 2-3 turns, mainly playing a preliminary positioning role. The small amount of screwing between the threaded end 201 and the threaded hole 111 avoids the loosening problem caused by insufficient rigidity of plastic in traditional full threaded connections, while reducing thread wear to extend service life. The anti-loosening function is achieved by the elastic retaining edge 210 of the nut end 203 and the anti-loosening block 120 of the housing 100 working together.
[0052] An elastic retaining edge 210 is provided at the nut end 203, forming a sealing gap between the smooth hole 112 and the smooth rod section 202. A sealing element is provided within the sealing gap. Within the sealing gap formed by the smooth hole 112 and the smooth rod section 202, the sealing element is pressed against the two sides of the sealing gap. Utilizing its own material properties, such as rubber, the elastic rebound after being compressed fills the sealing gap. Even if the thread is not fully tightened, as long as the elastic retaining edge 210 is tightened, the sealing element can still form a sealing barrier through compression deformation, adapting to high-pressure working conditions.
[0053] In addition, the bare rod section 202 replaces the traditional full thread design, which can reduce the amount of plastic material used and meet the goal of lightweighting. The nut end 203 integrates the elastic retaining edge 210 and the sealing element installation structure to achieve spatial integration of anti-loosening and sealing functions, simplifying the overall structure to reduce manufacturing complexity and cost.
[0054] In summary, the threaded end 201 has a small engagement amount, and the plug body 200 can be removed by overcoming the anti-disengagement torque of the elastic retaining edge 210 during disassembly. Combined with the reusable nature of the sealing element, it significantly improves after-sales maintenance efficiency and reduces thread damage caused by frequent disassembly.
[0055] Please see Figure 2 and Figure 4The sealing element includes a sealing sleeve 300, which is made of rubber. The sealing sleeve 300 is fitted onto the smooth rod section 202. Multiple sealing rings 310 are arranged axially at intervals on the outer wall of the sealing sleeve 300. The outer circumferential surface of the sealing rings 310 is interference-fitted with the inner circumferential wall of the smooth hole 112. The multiple axially spaced sealing rings 310 and the inner circumferential wall of the smooth hole 112 form multiple interference-fit sealing surfaces. When the plug body 200 is screwed into the oil port 110, the multiple sealing rings 310 are compressed and undergo radial elastic deformation. Their outer circumferential surfaces tightly adhere to the inner wall of the smooth hole 112. The resilience of the rubber material compensates for processing errors. Even if a single sealing ring 310 has a small gap, the other sealing rings 310 can still prevent oil leakage, forming a redundant sealing structure and significantly improving sealing reliability.
[0056] The multiple sealing rings 310 arranged at intervals can also distribute the axial compressive force between the smooth hole 112 and the smooth rod section 202 to multiple areas, avoiding plastic deformation or wear of a single sealing surface due to pressure concentration, thereby extending the service life of the sealing sleeve 300. At the same time, the axial spacing design allows the sealing sleeve 300 to produce a small amount of elastic displacement when the oil pressure fluctuates, further enhancing the sealing adaptability.
[0057] The structure of the sealing sleeve 300 fitted onto the smooth rod section 202 can accommodate the coaxiality deviation between the smooth rod section 202 and the smooth hole 112. The interference fit sealing ring 310 can automatically adjust its position through elastic deformation during installation to ensure the fitting accuracy with the inner wall of the smooth hole 112. The axial spacing design of the sealing ring 310 provides deformation buffer space for the sealing sleeve 300. When the screw plug body 200 is subjected to vibration and undergoes slight axial displacement, the sealing ring 310 can maintain the interference fit state through elastic compression or expansion, avoiding sealing failure due to rigid contact.
[0058] In addition, the sealing sleeve 300 is made of rubber, which is much lighter than the metal sealing structure. Combined with the plastic material design of the bare rod section 202, the overall weight is further reduced. The spaced sealing rings 310 reduce the amount of rubber material used. At the same time, the production of multiple identical sealing rings 310 through standardized molds reduces the complexity and cost of the manufacturing process, which is in line with the design goals of lightweighting and cost reduction.
[0059] Please see Figure 4The inner wall of the sealing sleeve 300 is provided with multiple anti-slip rings 320 arranged axially at intervals. The anti-slip rings 320 are interference-fitted with the polished rod section 202. The interference fit between the anti-slip rings 320 and the polished rod section 202 can generate radial clamping force, preventing the sealing sleeve 300 from moving axially along the polished rod section 202. Especially when the equipment vibrates or the oil pressure fluctuates, the elastic deformation of the anti-slip rings 320 can maintain the clamping force, preventing the sealing ring 310 from being misaligned with the aperture 112 due to displacement of the sealing sleeve 300, thus ensuring the stability of the multi-layer sealing structure. At the same time, the interference contact between the anti-slip rings 320 and the polished rod section 202 can generate circumferential friction. When the screw plug body 200 is screwed in, the anti-slip rings 320 rotate synchronously with the polished rod section 202, guiding the sealing sleeve 300 and the sealing ring 310 of the aperture 112 to be evenly squeezed, avoiding local wear of the sealing ring 310 due to circumferential slippage of the sealing sleeve 300.
[0060] Please see Figure 1 The housing 100 has an integrally formed mounting boss 130, an oil port 110 is formed on the mounting boss 130, and an anti-detachment block 120 is set on the mounting boss 130. The oil port 110 and the anti-detachment block 120 are integrated into the mounting boss 130, and the relative positional accuracy of the two can be ensured by molding in one piece. This allows the elastic retaining edge 210 to accurately engage with the retaining groove 122 of the anti-detachment block 120 when screwed in, avoiding engagement failure due to positional deviation. At the same time, the height of the mounting boss 130 can control the end face fit of the screw plug body 200 after screwing in, ensuring uniform compression of the sealing sleeve 300 and improving sealing reliability.
[0061] The raised structure of mounting boss 130 integrates functional components such as oil port 110 and anti-detachment block 120 within a limited space, avoiding the need for additional complex structures on the surface of housing 100, reducing material redundancy, and meeting the goal of lightweighting. At the same time, the regular shape of the boss facilitates mold processing, reducing the complexity and cost of manufacturing process.
[0062] Based on the same inventive concept, this utility model also provides a transmission. Since the transmission uses the above-mentioned oil port anti-detachment structure, it has the same beneficial effects as the oil port anti-detachment structure, which will not be described in detail here.
[0063] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. An oil port detachment preventing structure characterized by comprising: include: A housing (100) having an oil port (110) provided thereon; A screw plug body (200) is threadedly installed inside the oil port (110); The anti-detachment structure includes an anti-detachment block (120) and an elastic retaining edge (210). The anti-detachment block (120) is disposed on the outer surface of the housing (100) and located on one side of the oil port (110). The anti-detachment block (120) is provided with an anti-detachment edge (121) extending towards the oil port (110). The elastic retaining edge (210) is disposed on one side of the outer end of the screw plug body (200). As the screw plug body (200) is screwed into the oil port (110), the free end of the elastic retaining edge (210) is squeezed inward by the anti-detachment block (120) and springs back to be locked in the anti-detachment edge (121) to prevent the screw plug body (200) from rotating in the opposite direction.
2. The oil port anti-disengagement structure according to claim 1, characterized by The anti-detachment block (120) has a groove (122) adapted to the free end of the elastic retaining edge (210) on the side near the oil port (110), and the anti-detachment edge (121) is formed on the side of the groove (122) near the screw plug body (200) in the screw-in direction.
3. The oil port retention structure of claim 2, wherein The anti-detachment block (120) has a guide edge (123) on the side near the oil port (110). The guide edge (123) is located on the front side of the slot (122) along the screw-in direction of the screw plug body (200). The distance between the guide edge (123) and the oil port (110) decreases along the screw-in direction of the screw plug body (200).
4. The oil port anti-disengagement structure according to claim 2, characterized by The free end of the elastic retaining edge (210) extends away from the oil port (110).
5. The oil port anti-disconnection structure according to claim 1, characterized by The plug body (200) includes a threaded end (201), a smooth rod section (202), and a nut end (203) arranged sequentially from the inside to the outside. The oil port (110) includes a threaded hole (111) and a smooth hole (112) arranged sequentially from the inside to the outside. The threaded end (201) is adapted to the threaded hole (111). The elastic retaining edge (210) is provided on the nut end (203). A sealing gap is formed between the smooth hole (112) and the smooth rod section (202). A sealing element is provided in the sealing gap.
6. The oil port retention structure of claim 5, wherein The sealing element includes: A sealing sleeve (300) is fitted onto the optical rod section (202). The outer wall of the sealing sleeve (300) is provided with a plurality of sealing rings (310) arranged at intervals along the axial direction. The outer peripheral surface of the sealing rings (310) is interference-fitted with the inner peripheral wall of the optical hole (112).
7. The oil port retention structure of claim 6, wherein The inner wall of the sealing sleeve (300) is provided with a plurality of anti-slip rings (320) arranged at intervals along the axial direction, and the anti-slip rings (320) are interference-fitted with the smooth rod section (202).
8. The oil port retention structure of claim 1, wherein The housing (100) is provided with a mounting boss (130), the oil port (110) is opened on the mounting boss (130), and the anti-detachment block (120) is provided on the mounting boss (130).
9. The oil port retention structure of claim 1, wherein The screw plug body (200) is made of plastic.
10. A transmission characterized by, The oil port anti-disengagement structure according to any one of claims 1 to 9.