Universal aviation piston engine oil discharge device and discharge method

Abstract

The invention belongs to the technical field of aero-engine maintenance, discloses a universal aviation piston engine oil liquid discharging device and a discharging method, and aims to solve the problems that tools are poor in universality, operation space is limited, and oil liquid is prone to leaking to pollute equipment in a cabin during oil liquid discharging of different types of aviation piston engines. The discharging operation head assembly is composed of an oil receiving funnel and a ratchet mechanism fixedly arranged above the oil receiving funnel, the ratchet mechanism is provided with a standard connector and a direction conversion function and is used for being matched with and screwing oil discharging bolts of different specifications, and the oil receiving funnel is used for receiving oil at the moment when the bolts are disassembled. The discharging guide pipe assembly comprises an oil discharging hard pipe connected with the funnel, an oil discharging hose detachably connected with the oil discharging hard pipe and a collecting device capable of directionally guiding oil to the outside of the cabin. Through integration of tools, collection and guide functions, wide application to various engine oil discharge operations is achieved, and the maintenance efficiency, safety and cleanliness are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the technical field of aircraft maintenance and support equipment, specifically relating to a special discharge device and discharge method used for replacing, troubleshooting, or sampling lubricating oil, gear oil, or coolant during the maintenance of aircraft piston engines. Background Technology

[0002] Due to their economy, reliability, and ease of maintenance, aircraft piston engines occupy an important position in unmanned aerial vehicles, light general aviation aircraft, and some special-purpose aircraft. To ensure reliable engine operation, it is necessary to change the lubricating oil, gearbox oil, coolant, and other fluids inside the engine regularly or as needed, or to completely drain them during troubleshooting.

[0003] Currently, oil bleed operations for aircraft piston engines are typically performed manually: maintenance personnel use a standard ratchet wrench, socket wrench, or open-end wrench to directly loosen the drain plug (or drain valve) located at the bottom of the oil tank, gearbox, or water tank. At the moment the plug loosens, the oil gushes out under gravity and possible residual system pressure. To collect the oil, the operator must place a drip tray or bucket under the drain port beforehand. This method has revealed several problems in practice: 1. Poor tool versatility and low efficiency: Different engine models and manufacturers have different specifications for their drain plugs (e.g., hexagonal size, thread specification). Even within the same engine, the drain ports in different parts (e.g., the main lubrication system and gearbox) may differ. Maintenance personnel need to prepare and frequently change various sizes of sockets, screwdriver bits, and even complete wrenches, resulting in cumbersome tool management, long preparation time, and severely impacting maintenance efficiency. This problem is particularly pronounced for users with multiple types of aircraft fleets.

[0004] 2. Extremely confined operating space, prone to leakage: Aircraft engines are typically installed in the compact engine nacelle, which is filled with various pipes, cables, sensors, and auxiliary equipment. When using traditional long-handled wrenches, the space for maneuvering is severely limited, making it extremely easy to touch surrounding equipment. More seriously, when the drain plug is about to completely dislodge from the thread, the operator cannot simultaneously and accurately align the drain container with the gushing oil flow in the confined space, leading to initial oil splashing and leakage. Leaking oil will contaminate the engine block, nacelle, cables, and other accessories. Lubricating oil and other substances are flammable and can corrode rubber parts and attract dust, posing serious fire hazards and risks of equipment performance degradation.

[0005] 3. The collection device is limited by space and lacks flexibility: The space under the engine compartment is often blocked by structures such as landing gear and fairings, making it difficult to fit a large oil collection tank of suitable capacity. Usually, only a small oil tray can be used, which has a limited capacity. For systems with large oil discharge (such as cooling systems), it is necessary to stop the discharge midway, tighten the bolts, and replace the full oil tray, which is a cumbersome process and increases the risk of secondary leakage.

[0006] 4. Harsh working environment, affecting personnel health and safety: Oil leaks not only contaminate equipment but also the working environment. Operators may inhale oil fumes, come into contact with their skin, and working on oily floors or equipment increases the risk of slipping and falling.

[0007] Therefore, there is an urgent need for an integrated and universal dedicated discharge device that can adapt to different specifications of oil drain interfaces, be easy to operate in confined spaces, and achieve integrated "disassembly-collection-remote guidance" to fundamentally eliminate oil leakage during operation and improve the standardization, safety and efficiency of maintenance work. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the defects of poor tool adaptability, high operating space requirements, easy leakage and pollution and safety hazards in the existing aviation piston engine oil discharge operation, and to provide a special device and method with high universality, convenient operation and clean and safe discharge process.

[0009] The technical solution of this invention is implemented as follows: Firstly, this invention provides a universal aviation piston engine oil draining device. Its core innovation lies in organically integrating three functional modules—a bolt tightening tool, a leaking oil immediate collector, and a directional flow guide—into a portable handheld tool. This device mainly comprises two components: I. Discharge Operating Head Assembly This component is the functional front end of the device, interacting directly with the engine drain port and simultaneously performing the actions of loosening the bolt and connecting the oil.

[0010] Ratchet Mechanism: As the power input, its rotation axis is designed to be coaxial with the direction of oil flow. It uses standardized adapters (such as 1 / 4-inch, 3 / 8-inch, or 1 / 2-inch square tenons) for quick connection to various sizes of sockets or special-purpose bits, thus adapting to the drain plugs of most aircraft piston engines. This ratchet mechanism integrates two key function switches: Sleeve limiting mechanism: Includes a resilient limiting protrusion that can be controlled by a switch. Pressing the switch retracts the protrusion, allowing the sleeve to be inserted or removed; releasing the switch ejects the protrusion, locking the sleeve and preventing it from accidentally falling off during operation.

[0011] Ratchet Direction Reversing Switch: By tossing this switch, the unidirectional drive direction of the ratchet can be easily changed. During venting operations, first set it to the "Loosen" direction to unscrew the bolt; when emergency backplugging or tightening after replacing the gasket is required, switch to the "Tighten" direction without changing tools.

[0012] Oil receiving funnel: Fixed directly below the ratchet mechanism, its central oil drain port is strictly coaxial with the ratchet adapter. When the sleeve is fitted onto the drain bolt and loosening begins, the upper end of the funnel already surrounds the drain port area. Once the bolt is released, the oil flowing out will be immediately caught by the funnel, without any exposure or splashing. The upper edge of the funnel is inlaid with a rubber protective rim, which serves two purposes: first, to form a soft contact with the engine housing, creating a certain degree of sealing and buffering, reducing the possibility of oil overflowing from gaps; and second, to protect the paint or soft metal surface of the engine housing from scratches by hard tools.

[0013] II. Discharge duct assembly This component is responsible for safely and cleanly transporting the collected oil to the designated location.

[0014] Oil drain tube: A metal tube (such as stainless steel or aluminum alloy) whose front end is securely connected (preferably welded) to the oil outlet at the bottom of the oil funnel. Its axis is perpendicular to the ratchet axis. This design ensures that the direction of oil flow remains unchanged when the operator reciprocates the ratchet handle, and facilitates gripping and application of force. The rear end of the tube is machined with external threads (connecting threads) and a fixed hexagonal head. A rubber grip sleeve is fitted on the middle and rear of the tube, providing the operator with a comfortable and non-slip grip point.

[0015] Oil drain hose: A rubber or composite hose of a certain length and flexibility. Its front end is fitted with an outer nut, which, when screwed onto the connecting thread at the rear end of the drain hose, allows for quick connection and sealing. The hose length can be selected according to the actual distance from the engine compartment to the ground or the external oil receiving container. Its end (free end) can be easily placed into any suitable large, stable oil receiving container outside the engine compartment.

[0016] Secondly, the present invention provides an oil discharge method based on the above-mentioned device, which standardizes the operation process and specifically includes: 1. Preparation: Select a sleeve according to the specifications of the target drain bolt and tighten it on the ratchet; connect the drain hose of appropriate length.

[0017] 2. Tool docking: Set the ratchet rotation direction; align the sleeve at the front end of the device with the drain bolt, so that the rubber protection edge of the upper edge of the funnel is against the housing around the drain port; place the outlet end of the hose into the external oil receiving container.

[0018] 3. Bolt Removal and Oil Drainage: Hold the grip sleeve on the rigid pipe and use the reciprocating swing device to gradually loosen and finally remove the drain bolt via the ratchet mechanism. The oil is collected by the funnel from the moment it flows out and is directly introduced into a distant container through the rigid pipe and hose, completely isolated from the engine compartment environment.

[0019] 4. Post-operation processing: After discharge, remove the device, drain the residual oil, and disassemble the sleeve and hose for cleaning and storage.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Excellent versatility: Through a standardized ratchet interface, it can be adapted to various sleeves. A single set of devices can cover the oil drainage needs of the vast majority of aircraft piston engines, significantly reducing the types and number of tools required by maintenance units.

[0021] 2. Eliminate leakage at the source: The integrated design of the "tool-collector" ensures that the oil is sealed off the moment it is detached from the bolt, achieving "zero leakage" discharge. This completely solves the global problem of oil contamination in the engine compartment and greatly improves operational safety and cleanliness.

[0022] 3. Excellent adaptability to confined spaces: The compact head design combined with a ratchet mechanism allows for significant bolt rotation with only a small swing angle, perfectly adapting to the extremely narrow operating space within the engine compartment. The vertical rigid tube design facilitates gripping and force application.

[0023] 4. Efficient and convenient operation process: The remote flow diversion design allows the oil receiving container to be placed in the most convenient and safest location, without being limited by the narrow space directly under the engine. For large-capacity emissions, there is no need to change the oil receiving pan midway.

[0024] 5. Protection of equipment and personnel: Rubber protective edges prevent scratches on the engine; a clean working environment protects other equipment in the cabin; and it also avoids direct exposure of maintenance personnel to oily environments, improving working conditions.

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0026] Figure 1 A schematic diagram of the overall structure of a universal aviation piston engine oil discharge device provided in an embodiment of the present invention.

[0027] Figure 2 for Figure 1 Enlarged detail of the middle ratchet mechanism.

[0028] Explanation of reference numerals in the diagram: 1 - Rubber protective edge; 2- Ratchet mechanism; 3- Oil receiving funnel; 4- Drain pipe; 5- Rubber grip covers; 6- Fix the hexagonal head; 7- Connecting thread; 8- Outer nut; 9- Rubber hose; 2.1 - Sleeve limiting protrusion; 2.2 - Sleeve limit protrusion switch; 2.3- Ratchet direction change switch. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some embodiments of this invention, but not all embodiments.

[0030] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0031] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention.

[0032] The following is in conjunction with the appendix Figure 1-2 The embodiments of the present invention will be described in detail below.

[0033] Example 1 This invention discloses an oil discharge device suitable for the maintenance of various types of unmanned aerial vehicle (UAV) engines.

[0034] This embodiment addresses the routine oil change and gearbox oil draining procedures for various types of piston engines (such as ROTAX 912 / 914 series, Limbach L550 series, etc.) in the fleet of a general aviation company.

[0035] 1. Detailed design and selection of device components Ratchet Mechanism 2: Utilizing an industrial-grade 72-tooth precision small-diameter ratchet wrench core, its square tenon output head is a standard 3 / 8-inch size, the most commonly used interface size for small aerospace bolts. Secondary machining is performed on its outer casing. A sleeve limiting mechanism is added: a steel ball held by a spring is installed next to the square tenon hole as a limiting protrusion 2.1, and a cylindrical pin that can slide laterally is installed in the opening on the side of the outer shell as a control switch 2.2. Pressing the switch 2.2 inward causes the steel ball to retract due to the pressure of the internal inclined surface, allowing the sleeve to be installed or removed; releasing the switch causes the steel ball to pop out under the action of the spring, locking it into the annular groove at the tail of the sleeve.

[0036] The original ratchet direction change switch 2.3 is retained, with its paddle clearly marked with "LOOSEN" and "TIGHTEN" directions.

[0037] A connecting flange is machined at the bottom of the ratchet mechanism housing for welding to the oil receiving funnel 3.

[0038] Oil receiving funnel 3: Made of 1.0mm thick 304 stainless steel sheet by stamping and welding. The upper part is a large-diameter truncated cone shape with an opening diameter of Φ120mm, which is sufficient to accommodate most of the engine drain port and possible splashes. The lower part tapers into a short straight pipe with a diameter of Φ12mm, serving as the oil outlet. The upper end of the funnel is rolled, and a semi-circular cross-section oil-resistant fluororubber strip is embedded and vulcanized to serve as a protective edge 1. Near the top of the funnel, a short stainless steel column is welded to the side of the funnel. The upper end of the column is welded to the flange at the bottom of the ratchet mechanism 2, ensuring that the two are strictly coaxial, and the funnel receiving surface is located approximately 15mm directly below the ratchet square tenon.

[0039] Oil drain hose 4: A seamless 304 stainless steel pipe with an outer diameter of Φ10mm and a wall thickness of 1mm is selected, with a designed length of 350mm. One end is butt-welded to the Φ12mm oil outlet at the bottom of the oil funnel 3 using argon arc welding to ensure strength and sealing. After welding, this area is polished and deburred. An M10×1.0 fine-pitch connecting thread 7 is machined at the rear end of the hose, and a fixed hexagonal head 6 with a width across flats of 17mm is machined at the root of the thread for easy connection of the hose using a wrench. Approximately 100mm from the rear end of the hose, a heat-shrink sleeve is covered with a layer of EPDM rubber grip sleeve 5 with an anti-slip pattern.

[0040] Oil drain hose 9 and connectors: Uses an oil-resistant and pressure-resistant transparent PVC spiral reinforced hose with an inner diameter of Φ10mm and a wall thickness of 2mm. The standard length is 2 meters (can be cut to size as needed). One end of the hose is fitted with a brass outer nut 8. The inner hole of the nut has an M10×1.0 internal thread that matches the thread 7 of the rigid pipe connection, and is fastened and sealed to the hose body by a hose clamp.

[0041] 2. Supporting Attachments Sleeve set: Equipped with a set of commonly used aviation hexagonal sleeves, including sizes of 8mm, 10mm, 12mm, and 13mm (corresponding to common imperial 3 / 8", 7 / 16", 1 / 2", and 1 / 2" oil drain bolts), made of chrome vanadium steel with nickel plating for rust prevention.

[0042] Adapter (on demand): Includes a 3 / 8-inch square dowel to 1 / 4-inch square dowel reducing adapter to accommodate smaller bits or sockets.

[0043] The ratchet mechanism can use a higher number of teeth (such as 90 teeth or 120 teeth) to reduce the swing angle; the oil funnel can be designed with different interchangeable diameters to fit extra-large or extra-small oil outlets; the oil drain tube can be designed with a two-section telescopic or flexible structure to further adapt to special spaces; the hose connection can use a quick-connect coupling, etc.

[0044] 3. Typical Workflow (Taking changing ROTAX 912 engine lubricating oil as an example) Step S1: Job Preparation Locate the drain plug (usually a 13mm hex head) at the bottom of the engine oil reservoir.

[0045] Take the 13mm sleeve from the accessory box and align it with the ratchet mechanism 2 square tenon of the device. You will hear a "click" sound as the sleeve is automatically locked by the limiting protrusion 2.1.

[0046] Take out a 2-meter-long drain hose 9, screw the outer nut 8 at the front end onto the connecting thread 7 at the rear end of the drain hose 4, tighten it by hand, and then use a small wrench to hold the fixed hexagonal head 6 for further tightening to ensure no leakage.

[0047] Pass the free end of the drain hose 9 through the maintenance port or door gap in the engine compartment and place it into a 20-liter large-diameter waste oil recovery container prepared on the ground.

[0048] Step S2: Tool Integration Observe the drain plug and confirm the loosening direction (usually counterclockwise). Move the ratchet direction change switch 2.3 to the "LOOSEN" position.

[0049] Hold the rubber grip sleeve 5 on the drain pipe 4 with your right hand, align the 13mm sleeve at the front of the device with and securely slip it onto the drain bolt at the bottom of the engine.

[0050] Gently push the device upwards so that the rubber protective edge 1 of the upper edge of the oil funnel 3 fits against the surface of the bottom shell of the engine oil tank.

[0051] Step S3: Bolt removal and oil drainage Keep the device stable and begin reciprocating oscillation (approximately 30°-45°) to drain the oil pipe 4. The ratchet mechanism 2 converts the small-angle oscillation into continuous counterclockwise rotation of the bolt.

[0052] When you feel the bolt threads are about to come off completely, be careful. As the bolt is unscrewed for the last few turns, oil will begin to seep out and will be immediately and completely collected by the oil funnel 3.

[0053] After completely removing the bolts, approximately 4 liters of hot lubricating oil flowed smoothly into the funnel under gravity, passing through rigid pipe 4 and flexible pipe 9 to form a bright oil column, which was then directly injected into the recovery bucket 2 meters away. Apart from the device itself, no oil dripped or splashed inside the engine compartment.

[0054] The device can be slightly swung or moved to ensure that any residual oil in the drain port is completely drained out.

[0055] Step S4: Post-job processing Once the oil flow becomes droplets, keep the device in the oil receiving position for about one minute to ensure that most of the oil is drained.

[0056] Move the device from under the engine to above the recovery bucket, and invert the device to allow the oil remaining in the pipes and funnel to be completely drained into the bucket.

[0057] Press the sleeve limit protrusion switch 2.2, remove the 13mm sleeve that has been contaminated with oil, and put it into the box to be cleaned.

[0058] Use a wrench to hold the hexagonal head 6 in place, loosen and remove the outer nut 8, and disconnect the drain hose 9. Perform a simple wipe on the main body of the device (especially the funnel and rigid pipe) and the hose.

[0059] After cleaning the drain plug and replacing the gasket, you can reverse the operation (switch the ratchet direction to "TIGHTEN") and use the same device to tighten it to the specified torque.

[0060] 4. Application Effects By applying the device described in this embodiment, the company has reduced the average oil change time for various drone engines by approximately 25%, and completely eliminated the previously time-consuming step of cleaning the engine compartment after each oil change. The equipment cables within the engine compartment remain clean, eliminating potential safety hazards. Maintenance personnel report that the device is labor-saving, streamlined, and significantly improves the working environment.

[0061] Example 2 This invention discloses a device that enables convenient oil discharge from aircraft piston engines, improves oil discharge efficiency, reduces the types of oil collection devices required for operation, avoids pollution of equipment in the engine compartment during oil discharge, and improves the safety of the operation process.

[0062] A universal oil draining device for aviation piston engines includes a ratchet mechanism, an oil receiving funnel, a drain rigid pipe, and a drain hose. This device allows operators to easily use various sizes of sockets, which can also be fitted with screwdriver bits to loosen drain bolts of various sizes. It has strong versatility for draining oil from different engine models or different parts of the same engine model. The ratchet mechanism of this device is welded to the oil receiving funnel via a column. The ratchet mechanism is coaxial with the oil drain opening of the funnel. This mechanism allows for easy loosening of the drain bolt even in confined spaces. The ratchet mechanism's adapter is available in common sizes such as 1 / 4 inch and 3 / 8 inch, enabling connection to various sizes of sleeves. The ratchet mechanism features sleeve limiting protrusions and control switches to ensure reliable connection between the sleeve and the ratchet mechanism. Furthermore, the lower part of the ratchet mechanism has a ratchet direction switch, allowing for clockwise and counterclockwise rotation of the drain bolt, greatly improving the flexibility of the oil discharge device. The oil receiving funnel guides the oil flow, preventing leakage due to high flow rate or pressure during discharge. The rubber protective rim at the top of the oil receiving funnel is made of a soft material. This design avoids oil leakage and prevents damage to the engine housing and equipment during operation. The drain hose is welded to the drain funnel, with the axis of the drain hose perpendicular to the axis of the ratchet mechanism. The rear end of the drain hose is vulcanized with a rubber grip sleeve for easy handling. The hexagonal head and threaded connection at the rear end allow for connection between the drain hose and drain tubing, improving the ease of assembly and ensuring the sealing of the drain line. The operator can define the length of the drain hose and drain tubing according to actual needs. The drain tubing is threaded to the drain hose via an outer nut, allowing for easy discharge of oil to various oil collection devices outside the engine compartment. This overcomes the limitations imposed by operating space on oil collection devices and prevents oil leakage into the engine compartment, thus avoiding equipment contamination and safety hazards.

[0063] The operation of the auxiliary device for oil discharge from an aircraft piston engine is described below, in conjunction with the device's structural outline drawing and the outline drawing of the device's ratchet mechanism, so that those skilled in the art can perform the operation.

[0064] Before using this device to drain oil: Select a suitable socket and bit (as needed) according to the specifications of the drain bolt, and install them on the ratchet mechanism of this device. According to the loosening direction of the drain bolt, turn on the ratchet direction change switch below the ratchet mechanism. Use a hex wrench to fix the hex head in place. Connect and tighten the outer nut of the drain hose to the connecting thread of the drain hard pipe. Hold this device at the rubber grip on the drain hard pipe and align the socket and bit (as needed) with the drain bolt. Insert the other end of the rubber hose into the oil receiving device outside the engine room.

[0065] This device is used for draining oil: by rotating the device along the axial direction of the ratchet mechanism, the drain bolt is loosened, and the oil is drained.

[0066] Work after draining oil: After draining all the oil, retrieve the device and let the remaining oil in the device flow along the pipeline into the oil receiving device. Press the sleeve limit protrusion switch below the ratchet mechanism, remove the sleeve and screwdriver bit (if needed) and clean them. Use a hex wrench to fix the hex head in place, loosen the connection between the outer nut of the drain hose and the drain hard pipe, and store the device properly.

[0067] Thus, the objective of this invention has been achieved.

[0068] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A universal oil draining device for aircraft piston engines, characterized in that, include: A drain valve assembly for connecting to and tightening the drain plug at the bottom of the engine oil reservoir, the assembly comprising: An oil receiving funnel (3) is used to receive and guide the oil flowing out of the drain port during the removal of the drain bolt; A ratchet mechanism (2) is fixedly connected above the oil receiving funnel (3), and its rotation axis is coaxial with the oil leakage round opening of the oil receiving funnel (3). The ratchet mechanism (2) has an adapter for connecting sleeves or bits of different specifications. A discharge conduit assembly for directing received oil to a designated collection location, the assembly comprising: An oil drain tube (4) is fixedly connected at its front end to the lower oil outlet of the oil receiving funnel (3), and its axis is perpendicular to the rotation axis of the ratchet mechanism (2). An oil drain hose (9) has its front end detachably and sealed to the rear end of the oil drain hard pipe (4) via a connecting structure, and its rear end is a free end, used to drain oil to a collection device located outside the engine compartment.

2. The universal aviation piston engine oil discharge device according to claim 1, characterized in that, The adapter of the ratchet mechanism (2) is a standard size interface, selected from 1 / 4-inch square tenon, 3 / 8-inch square tenon or 1 / 2-inch square tenon.

3. The universal aviation piston engine oil draining device according to claim 1 or 2, characterized in that, The ratchet mechanism (2) further includes: A sleeve limiting mechanism having an operable sleeve limiting protrusion switch (2.2) for controlling the pop-out and retraction of the sleeve limiting protrusion (2.1) to achieve reliable locking or quick disassembly of the sleeve or bit and the adapter. The ratchet direction change switch (2.3) is used to switch the unidirectional drive direction of the ratchet mechanism to enable the tightening or loosening of the drain bolt.

4. The universal aviation piston engine oil draining device according to claim 1, characterized in that, The upper edge of the oil receiving funnel (3) is provided with a rubber protective rim (1).

5. The universal aviation piston engine oil draining device according to claim 1, characterized in that, The outer wall of the rear end of the oil drain pipe (4) is provided with a rubber grip sleeve (5).

6. The universal aviation piston engine oil draining device according to claim 1, characterized in that, The connection structure between the drain hose (4) and the drain tube (9) includes: The connecting thread (7) and the adjacent fixed hexagonal head (6) are provided at the rear end of the drain pipe (4). An outer nut (8) is provided at the front end of the drain hose (9), and the outer nut (8) is screwed into the connecting thread (7) to achieve connection and sealing between the two.

7. The universal aviation piston engine oil draining device according to claim 1, characterized in that, The ratchet mechanism (2) is fixed to the oil receiving funnel (3) by welding a column.

8. The universal aviation piston engine oil draining device according to claim 1, characterized in that, The front end of the oil drain pipe (4) is welded to the oil outlet of the oil receiving funnel (3).

9. A method for draining oil from an aircraft piston engine based on the apparatus according to any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Work preparation: Select a suitable sleeve or bit according to the specifications of the drain bolt of the engine to be discharged, install it on the adapter of the ratchet mechanism (2) of the discharge device, and lock it through the sleeve limiting mechanism; seal the drain hose (9) to the rear end of the drain hard pipe (4) through the connecting structure. S2, Tool docking: According to the loosening direction of the drain bolt, operate the ratchet direction conversion switch (2.3) to set the driving direction of the ratchet mechanism (2); hold the grip part of the drain device, align the sleeve or bit with and put it into the drain bolt at the bottom of the engine oil storage component; attach the upper end of the oil funnel (3) to the area around the drain port; place the free end of the drain hose (9) into the oil collection device outside the engine compartment; S3, Bolt removal and oil discharge: The discharge device is oscillating back and forth along the axial direction of the ratchet mechanism (2). The drain bolt is loosened by the ratchet mechanism (2) until the oil starts to flow out. The oil is collected by the oil collection funnel (3) and flows through the drain hard pipe (4) and drain hose (9) in sequence, and is finally introduced into the collection device outside the engine compartment. S4. Post-operation processing: After the oil is drained, remove the draining device and drain the residual oil in the device; operate the sleeve limiting mechanism to remove the sleeve or bit; disassemble the drain hose (9) and clean and store it.

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