Oil pan assembly

Abstract

The utility model relates to the technical field of engine oil pans, in particular to an oil pan assembly which is arranged below a crankcase of an unmanned aerial vehicle engine and comprises a shell, an oil scavenging pump, an oil tank and a high-pressure oil pump. An oil return connector is arranged at the bottom of the shell and communicated with the input end of the oil return pump through a first pipeline, and the output end of the oil return pump is communicated with the oil tank through a second pipeline. The input end of the high-pressure oil pump communicates with the oil tank through a third pipeline, and the output end of the high-pressure oil pump communicates with a cylinder body oil duct of the engine cylinder body through a fourth pipeline; the third pipeline communicates with the bottom of the oil tank; the oil pan assembly solves the problem that an oil pan assembly of an in-line four-cylinder engine for an unmanned aerial vehicle cannot pump oil when the working angle of the unmanned aerial vehicle is large.

Description

Technical Field

[0001] The utility model relates to the technical field of engine oil pans, in particular to an oil pan assembly. Background Art

[0002] The oil pan is the lower half of the engine crankcase. Its function is to seal the crankcase as the shell of the oil storage tank to prevent impurities from entering, and to collect and store the lubricating oil flowing back from the various friction surfaces of the engine, dissipate some heat, and prevent the lubricating oil from oxidizing.

[0003] The oil pan assembly of the inline four-cylinder engine used in drones has a natural defect in the inline four-cylinder engine used in drones because the drone is tilted at an angle of up to 45 degrees when working. The ordinary sheet metal oil pan cannot meet the oil absorption requirements of the engine in this posture, causing the engine to be unable to operate normally and the drone to easily lose power. Utility Model Content

[0004] The purpose of the utility model is to provide an oil pan assembly, which solves the problem that the oil pan assembly of an inline four-cylinder engine for a drone cannot pump oil when the drone works at a large angle.

[0005] The utility model is realized by the following technical solutions: an oil pan assembly is arranged below the crankcase of the UAV engine, comprising a housing, an oil return pump, an oil tank and a high-pressure oil pump, wherein the oil tank is columnar and arranged vertically;

[0006] An oil return joint is provided at the bottom of the housing, the oil return joint is connected to the input end of the oil return pump through a first pipe, and the output end of the oil return pump is connected to the oil tank through a second pipe;

[0007] The input end of the high-pressure oil pump is communicated with the oil tank through a third pipe, and the output end of the high-pressure oil pump is communicated with the cylinder oil passage of the engine cylinder through a fourth pipe.

[0008] Furthermore, the third pipe is connected to the bottom of the oil tank.

[0009] Furthermore, the high-pressure oil pump is arranged inside the housing.

[0010] Furthermore, a cooler is provided on the second pipeline.

[0011] Furthermore, the top of the oil tank is connected to a crankcase ventilation system through a fifth pipe.

[0012] Furthermore, it also includes an oil inlet pipe, the housing is provided with a through hole, one end of the oil inlet pipe is connected to the input end of the high-pressure oil pump, and the other end of the oil inlet pipe passes through the through hole and is connected to the third pipeline;

[0013] The oil inlet pipe is provided with a flange joint, and the flange joint is sealed and docked with the through hole.

[0014] Furthermore, the oil tank is arranged on the frame of the UAV.

[0015] The technical solution of the utility model has at least the following advantages and beneficial effects:

[0016] 1. The inner cavity of the oil tank is cylindrical and mainly stores engine oil. The input end of the high-pressure oil pump is connected to the bottom of the oil tank through a third pipe. The oil tank stores a high level of engine oil. Then, when the oil tank deflects a certain angle in any direction with the drone, the liquid level will submerge the interface with the third pipe. Compared with the traditional oil pan, the high-pressure oil pump can smoothly extract engine oil even when the drone is tilted at a large angle, ensuring the normal operation of the engine.

[0017] 2. The high-pressure oil pump is arranged inside the housing, and the housing can be used to protect the high-pressure oil pump. While making rational use of space, it is also convenient for fixing the high-pressure oil pump and arranging the driving mechanism. Here, the high-pressure oil pump can be connected to the crankshaft sprocket and chain to drive the high-pressure oil pump. The output end of the high-pressure oil pump is also conveniently connected to the cylinder oil channel of the engine cylinder block, thereby improving the integration and will not be exposed to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of the three-dimensional structure of an oil pan assembly provided by the utility model;

[0020] Figure 2 This is a schematic diagram of the top structure of an oil pan assembly provided by the utility model;

[0021] Figure 3 This is a bottom view structural diagram of an oil pan assembly provided by the utility model;

[0022] Icons: 1. Housing, 11. Oil return joint, 12. Through hole, 2. Oil return pump, 21. First pipe, 22. Second pipe, 3. Oil tank, 31. Fifth pipe, 4. High-pressure oil pump, 41. Third pipe, 42. Fourth pipe, 5. Cooler, 6. Oil inlet pipe, 61. Flange joint. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] 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 rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0025] Reference Figures 1 to 3 As shown, this embodiment provides an oil pan assembly, which is arranged below the crankcase of the UAV engine, including a shell 1, an oil return pump 2, an oil tank 3 and a high-pressure oil pump 4. The oil tank 3 is columnar and vertically arranged; more specifically, the oil tank 3 is arranged outside the shell 1 and fixed to the frame of the UAV. The inner cavity of the oil tank 3 is cylindrical, and the interior mainly stores engine oil. Compared with the shell 1 of the traditional oil pan, the shell 1 is reduced in height to only about 10 cm, which saves space and reduces the amount of engine oil stored in the shell 1.

[0026] Housing 1 is die-cast from ADC12. The oil pan assembly's mounting surface and mounting holes are machined, along with the sealing ring groove. This aluminum housing provides superior strength, allowing it to withstand severe weather conditions such as hail during high-altitude drone operation. Housing 1 has internal reinforcement ribs, die-cast simultaneously with the housing, enhancing the modal properties. A rubber reservoir is also die-cast along the edge, improving sealing performance.

[0027] like Figure 3 As shown, an oil return connector 11 is provided at the bottom of the housing 1. The oil return connector 11 is made of ADC12, is die-cast together with the housing 1, has a machined outer circle and a convex bulge, and is fixed to the first pipe 21 of the drone with a clamp; the oil return connector 11 is connected to the input end of the oil return pump 2 through the first pipe 21, and the output end of the oil return pump 2 is connected to the oil tank 3 through the second pipe 22; and then the oil inside the housing 1 is pumped into the oil tank 3 in real time through the oil return pump 2.

[0028] More specifically, Figure 1-Figure 3As shown, the input end of the high-pressure oil pump 4 is connected to the bottom of the oil tank 3 through the third pipe 41. The oil tank 3 stores a relatively high level of engine oil. When the oil tank 3 deflects a certain angle in any direction as the drone does, the liquid level will submerge the interface with the third pipe 41. Compared with the traditional oil pan, the high-pressure oil pump 4 can smoothly extract engine oil even when the drone is tilted at a large angle, thereby ensuring the normal operation of the engine.

[0029] The output end of the high-pressure oil pump 4 is connected to the cylinder oil channel of the engine cylinder through the fourth pipe 42, and then enters the cylinder main oil channel after passing through the oil filter and cooling assembly for subsequent lubrication of the engine cavity.

[0030] When implementing it specifically, Figure 1 and Figure 2 As shown, the high-pressure oil pump 4 is arranged inside the housing 1, and the high-pressure oil pump 4 can be protected by the housing 1. While making rational use of space, it is also convenient to fix the high-pressure oil pump 4 and arrange the driving mechanism. Here, the crankshaft sprocket and chain can be used to connect with the high-pressure oil pump 4 to drive the high-pressure oil pump 4. The output end of the high-pressure oil pump 4 is also conveniently connected to the cylinder oil channel of the engine cylinder block, thereby improving the integration and will not be exposed to the outside.

[0031] like Figure 1-Figure 3 As shown, a cooler 5 is provided on the second pipe 22 to cool the engine oil extracted from the housing 1 for subsequent use.

[0032] More specifically, when the oil return pump 2 extracts the oil from the bottom of the housing 1, when the drone is deflected, it is possible that air is sucked in and transported into the oil tank 3. The top of the oil tank 3 is connected to the crankcase ventilation system through the fifth pipe 31, which can prevent the internal pressure of the oil tank 3 from being too high. At the same time, the air discharged from the oil tank 3 is decomposed into oil and gas through the oil-gas separator. The oil returns to the cylinder head cavity, and the gas enters the intake manifold to participate in combustion.

[0033] like Figure 1 and Figure 2 As shown, it also includes an oil inlet pipe 6. A through hole 12 is provided on the shell 1. One end of the oil inlet pipe 6 is connected to the input end of the high-pressure oil pump 4, and the other end of the oil inlet pipe 6 passes through the through hole 12 and is connected to the third pipe 41; a flange joint 61 is provided on the oil inlet pipe 6, and the flange joint 61 is sealed and connected to the through hole 12. A sealing ring is clamped between the flange joint 61 and the shell 1, and an annular groove is provided at the through hole 12 for limiting the sealing ring.

[0034] The oil inlet pipe 6 is made of 20# steel, and the flange joint 61 is made of Q235. The flange joints 61 are stamped and formed at both ends, and the oil inlet pipe 6 is bent into an L-shape. The oil inlet pipe 6 and the flange joint 61 are brazed together, ensuring both airtightness and a more reliable connection. A bellows structure is used in the middle of the oil inlet pipe 6 to eliminate installation errors caused by manufacturing variations in the flange joints 61 at both ends, as well as stress applied to the oil inlet pipe 6 after bolt tightening.

[0035] A cold-forged bulge is provided at the head of the oil inlet pipe 6 near one end of the third pipe 41 and is fixed to the third pipe 41 by a clamp.

[0036] The sealing ring is made of AEM. Due to the low operating temperature of the UAV at high altitude, low-temperature grade AEM TR10 < -40 ° C is used. The sealing ring is bolted to the flange of the oil inlet pipe 6 and pressed into the annular groove on the housing 1.

[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An oil pan assembly, disposed below the crankcase of a UAV engine, characterized in that: It comprises a housing (1), an oil return pump (2), an oil tank (3) and a high-pressure oil pump (4), wherein the oil tank (3) is columnar and vertically arranged; An oil return joint (11) is provided at the bottom of the housing (1), the oil return joint (11) being connected to the input end of the oil return pump (2) via a first pipe (21), and the output end of the oil return pump (2) being connected to the oil tank (3) via a second pipe (22); The input end of the high-pressure oil pump (4) is connected to the oil tank (3) through a third pipe (41), and the output end of the high-pressure oil pump (4) is connected to the cylinder oil passage of the engine cylinder through a fourth pipe (42).

2. The oil pan assembly according to claim 1, characterized in that: The third pipe (41) is in communication with the bottom of the oil tank (3).

3. The oil pan assembly according to claim 2, characterized in that: The high-pressure oil pump (4) is arranged inside the housing (1).

4. The oil pan assembly according to claim 3, characterized in that: A cooler (5) is provided on the second pipeline (22).

5. The oil pan assembly according to claim 4, characterized in that: The top of the oil tank (3) is connected to a crankcase ventilation system via a fifth pipe (31).

6. An oil sump assembly according to any one of claims 2 to 4, characterized in that: It also includes an oil inlet pipe (6), a through hole (12) is provided on the housing (1), one end of the oil inlet pipe (6) is communicated with the input end of the high-pressure oil pump (4), and the other end of the oil inlet pipe (6) passes through the through hole (12) and is communicated with the third pipeline (41); The oil inlet pipe (6) is provided with a flange joint (61), and the flange joint (61) is sealed and docked with the through hole (12).

7. The oil sump assembly according to claim 6, characterized in that: The oil tank (3) is arranged on the frame of the drone.

Images