Aero-engine magneto rotor

Abstract

An aero-engine magneto rotor is installed on a crankshaft and used in cooperation with a stator disc. The magneto rotor comprises a disc body made of aluminum alloy materials, a plurality of permanent magnets used for generating magnetic fields and triggering ignition signals are evenly embedded in the outer circle face of the disc body, and the magnetic pole directions of the permanent magnets are arranged in the circumferential direction of the disc body. The disc body is made of an aluminum alloy material so that the weight of the magnetic steel can be greatly reduced. The permanent magnets are of an embedded structure, the permanent magnets and the disc body are integrated, and the problem that the permanent magnets are fixed on the magnetic steel is thoroughly solved; 2, the structure of the magneto rotor is simplified, and the manufacturing cost of the magneto rotor is reduced; and thirdly, the disc body does not have magnetic conductivity, and when the permanent magnet is close to the induction coil, the induction coil can generate a stronger ignition signal. Besides, the magnetor rotor is not provided with a protruding ignition signal trigger block, and the permanent magnets are directly exposed out of the outer circular surface of the disc body, so that the distance between the permanent magnets and the coil is greatly shortened, and the power generation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aeroengines, and in particular to a magneto rotor of an aeroengine. Background Art

[0002] A piston aircraft engine is mainly composed of a crankshaft, connecting rod, piston, cylinder, magneto, air distributor and casing. The magneto has two functions: one is to generate electricity to provide electrical energy for the aircraft engine; the other is to provide ignition timing signals for the aircraft engine.

[0003] See attached Figure 1 The magneto is mainly composed of a rotor and a stator disk. The stator disk is mounted on the casing, and the rotor is mounted on the crankshaft. A permanent magnet 20 and an ignition signal trigger block 30 are arranged on the magneto rotor. Two types of coils are installed on the stator disk. One is a power generation coil 50, which cuts the magnetic lines of force for power generation; the other is an induction coil 40, which cooperates with the ignition signal trigger block 30 to generate an ignition signal.

[0004] There are currently two main problems with the magneto rotor: first, the permanent magnet 20 cannot be fixed by conventional means, and can only be clamped in the rotor made of steel by a complex flanging and snap-fitting process. This results in a large rotor weight and volume, and a high manufacturing cost, which does not meet the lightweight requirements of aircraft engines; second, because the permanent magnet 20 is clamped in the rotor and the ignition signal trigger block 30 is protruding, the distance between the permanent magnet 20 and the generating coil 50 is large, affecting the power generation efficiency. Summary of the invention

[0005] In order to overcome the shortcomings of the background technology, the present invention discloses an aircraft engine magneto rotor, the purpose of which is:

[0006] 1. Reduce the weight and volume of the magneto rotor and reduce manufacturing costs;

[0007] 2. Shorten the distance between the permanent magnet and the coil to improve power generation efficiency.

[0008] Specifically, the present invention adopts the following technical solutions:

[0009] A magnetic motor rotor for an aircraft engine is installed on a crankshaft and used in conjunction with a stator disc; the magnetic motor rotor comprises a disc body made of an aluminum alloy material, and a plurality of permanent magnets for generating a magnetic field and triggering an ignition signal are evenly embedded on the outer circumferential surface of the disc body, and the magnetic pole direction of the permanent magnet is arranged along the circumference of the disc body.

[0010] After implementing the above technical solution, compared with the background technology, the beneficial effects produced by the present invention are:

[0011] 1. The material of the disk is aluminum alloy, which can greatly reduce the weight of the magnetic steel;

[0012] 2. The embedded structure makes the permanent magnet and the disk body form an integral whole, which completely solves the problem of fixing the permanent magnet on the magnetic steel;

[0013] 3. Simplified the structure of the magneto rotor and reduced the manufacturing cost;

[0014] 4. There is no protruding ignition signal trigger block, and the permanent magnet is directly exposed on the outer surface of the disk, which greatly shortens the distance between the permanent magnet and the coil and improves the power generation efficiency;

[0015] 5. The permanent magnet has a magnetic field, while the disk has no magnetic conductivity. When the permanent magnet approaches the induction coil, the induction coil can generate a stronger ignition signal.

[0016] The existing permanent magnet is clamped in the rotor made of steel, making the rotor magnetic, so only a protruding ignition signal trigger block can be set on the rotor. The ignition principle is that when the ignition signal trigger block is not close to the induction coil, the rotor has a relatively weak magnetic field strength, and the induction coil induces a lower electrical signal. When the ignition signal trigger block approaches the induction coil, the gap between the induction coil and the magneto rotor suddenly becomes smaller, the magnetic field strength suddenly increases, and the induction coil can induce a higher electrical signal, thereby forming an ignition signal. Since the difference between the higher electrical signal and the lower electrical signal is small, the ignition signal is not obvious, and the engine may not ignite.

[0017] The magneto rotor is not provided with a protruding ignition signal trigger block, and the disk body is not magnetically conductive. When the permanent magnet is not close to the induction coil, the induction coil will basically not induce an electrical signal. When the permanent magnet is close to the induction coil, the induction coil can induce a very high electrical signal. Since the signal difference is obvious, an obvious ignition signal can be formed to ensure the engine ignition.

[0018] To further improve the technical solution, four arc-shaped avoidance grooves are evenly arranged on the outer circumferential surface of the disc body.

[0019] After the above technical solution is implemented, the beneficial effects are as follows: the avoidance groove has two functions. One is to avoid bolts, which makes it easier for operators to use tools to pass through the avoidance groove for assembly operations; the other is to indirectly reduce weight.

[0020] To further improve the technical solution, a weight-reducing structure is evenly arranged on the disc body along the circumference.

[0021] After the above technical solution is implemented, the beneficial effect produced is: the weight-reducing structure can be a weight-reducing groove or a weight-reducing hole, and the weight-reducing structure can further reduce the weight of the magneto rotor, which is beneficial to improving the lightweight of the aircraft engine.

[0022] To further improve the technical solution, the length of the permanent magnet embedded in the disk body is greater than the length of the permanent magnet exposed outside the disk body.

[0023] After the above technical solution is implemented, the beneficial effect is that the length of the permanent magnet embedded in the disk body is greater than the length of the permanent magnet exposed outside the disk body, forming a structure with a small mouth and a large belly, ensuring that the permanent magnet will not fall out of the disk body.

[0024] To further improve the technical solution, a positioning shaft hole is provided at the center of the disk body.

[0025] After the above technical solution is implemented, the beneficial effect produced is: the magneto rotor is installed on the crankshaft, and the positioning shaft hole is provided to help ensure the coaxiality of the magneto rotor and the crankshaft.

[0026] To further improve the technical solution, a plurality of arc-shaped adjustment connection holes are evenly arranged on the disc body along the circumferential direction, with the axis of the positioning shaft hole as the center.

[0027] After implementing the above technical solution, the beneficial effect is that during assembly, there is a certain installation angle relationship between the permanent magnet and the induction coil, and an arc-shaped adjustment connection hole is provided to adjust the installation angle of the magnetic motor rotor on the crankshaft.

[0028] To further improve the technical solution, two permanent magnets are evenly arranged on the outer circumferential surface of the disk.

[0029] After the above technical solution is implemented, the beneficial effect produced is: for a small-displacement four-cylinder aircraft engine, setting two permanent magnets can meet the needs of power generation and timing ignition. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Attached Figure 1 Shown is a schematic diagram of the structure of a magneto rotor of an existing aircraft engine.

[0031] Attached Figure 2 Shown is a front view of the magneto rotor of the aircraft engine.

[0032] Attached Figure 3 Shown is a rear view of the magneto rotor of the aircraft engine.

[0033] Attached Figure 4 The attached Figure 2 sectional view of .

[0034] Attached Figure 5 What is shown is a three-dimensional structural schematic diagram of the magnetic motor rotor of the aircraft engine.

[0035] Attached Figure 6 Shown is a schematic diagram of the aircraft engine magneto rotor in operation.

[0036] In the attached figure:

[0037] 10. Plate body; 11. Avoidance groove; 12. Positioning shaft hole; 13. Adjustment connection hole; 14. Weight reduction structure;

[0038] 20. Permanent magnet;

[0039] 30. Ignition signal trigger block;

[0040] 40. Induction coil;

[0041] 50. Generator coil. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. It should be noted that in the description of the present invention, the terms "front", "rear", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal connection of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0043] An aircraft engine magneto rotor is mounted on a crankshaft and is used to generate electricity and provide ignition timing. The magneto rotor includes a disk and a permanent magnet. The structure and function thereof are described in detail below.

[0044] See attached Figure 2-5 . The disk body 10 is made of aluminum alloy material, and a plurality of permanent magnets 20 are evenly embedded on the outer circumferential surface of the disk body 10, and the magnetic pole (NS) direction of each permanent magnet 20 is arranged along the circumferential direction of the disk body 10. In this embodiment, the magneto rotor is applied to a small four-cylinder aircraft engine with a displacement of 550ml, and two permanent magnets 20 are embedded on the outer circumferential surface of the disk body 10. It is worth noting that for a six-cylinder aircraft engine, three permanent magnets 20 can be evenly embedded on the outer circumferential surface of the disk body 10; for an eight-cylinder aircraft engine, four permanent magnets 20 can be evenly embedded on the outer circumferential surface of the disk body 10.

[0045] First, the use of aluminum alloy material for the disk body 10 can significantly reduce the weight of the magnetic steel. Second, the embedded structure allows the permanent magnet 20 to be integrated with the disk body 10, permanently solving the problem of fixing the permanent magnet 20 on the magnetic steel. Moreover, the embedded structure allows the permanent magnet 20 to be directly exposed on the outer circumferential surface of the disk body 10 without the need for outer skin wrapping, shortening the distance between the permanent magnet 20 and the coil. In addition, the embedded structure simplifies the structure of the magnetic motor rotor and reduces the manufacturing cost.

[0046] In terms of manufacturing process, the permanent magnet 20 can be embedded when the disk body 10 is cast. The melting point of the aluminum alloy material is only 500-600° C., and technical means can be used to ensure that the permanent magnet does not demagnetize.

[0047] Again refer to the attached Figure 1 . The existing permanent magnet 20 is clamped in a rotor made of steel, making the rotor magnetic, so only a protruding ignition signal trigger block 30 can be set on the rotor. The ignition principle is that when the ignition signal trigger block 30 is not close to the induction coil 40, the rotor has a relatively weak magnetic field strength, and at this time the induction coil 40 senses a lower electrical signal. When the ignition signal trigger block 30 approaches the induction coil 40, the gap between the induction coil 40 and the rotor suddenly becomes smaller, and the magnetic field strength suddenly increases. The induction coil 40 can sense a higher electrical signal, thereby forming an ignition signal. Since the difference between the higher electrical signal and the lower electrical signal is small, the ignition signal is not obvious, and the engine may not ignite.

[0048] See attached Figure 6 The magneto rotor is not provided with a protruding ignition signal trigger block, and the disk body 10 is not magnetically conductive. When the permanent magnet 20 is not close to the induction coil 40, the induction coil 40 basically does not induce an electrical signal. When the permanent magnet 20 is close to the induction coil 40, the induction coil 40 can induce a very high electrical signal. Since the signal difference is obvious, an obvious ignition signal can be formed to ensure the engine ignition.

[0049] For a four-cylinder aircraft engine, two permanent magnets 20 are embedded in the disc body 10, one permanent magnet 20 is used to provide ignition signals for two of the cylinders, and the other permanent magnet 20 is used to provide ignition signals for the other two cylinders. Similarly, for a six-cylinder aircraft engine, three permanent magnets 20 can be evenly embedded on the outer circumference of the disc body 10; for an eight-cylinder aircraft engine, four permanent magnets 20 can be evenly embedded on the outer circumference of the disc body 10.

[0050] In addition, since the magneto rotor is not provided with a protruding ignition signal trigger block 30, the distance between the permanent magnet 20 and the power generation coil 50 is further shortened, the density of the power generation coil 50 cutting the magnetic lines of force is increased, and the power generation efficiency is improved.

[0051] To further improve the technical solution, four arc-shaped avoidance grooves 11 are evenly arranged on the outer circumferential surface of the disc body. The avoidance grooves 11 have two functions: one is to avoid bolts, which is convenient for operators to use tools to pass through the avoidance grooves for assembly operations; the other is to indirectly reduce weight.

[0052] To further improve the technical solution, a weight-reducing structure 14 is evenly arranged along the circumference of the disc body 10. The weight-reducing structure 14 can be a weight-reducing groove or a weight-reducing hole, and the weight-reducing structure 14 can further reduce the weight of the magneto rotor, which is beneficial to improving the lightweight of the aircraft engine.

[0053] To further improve the technical solution, the length of the permanent magnet 20 embedded in the disc body 10 is greater than the length of the permanent magnet 20 exposed outside the disc body 10. In this way, a structure with a small mouth and a large belly is formed to ensure that the permanent magnet 20 will not fall out of the disc body 10.

[0054] To further improve the technical solution, a positioning shaft hole 12 is provided at the center of the disk body 10. The magneto rotor is mounted on the crankshaft, and the positioning shaft hole 12 helps to ensure the coaxiality of the magneto rotor and the crankshaft.

[0055] To further improve the technical solution, eight arc-shaped adjustment connection holes 13 are evenly arranged on the disk body 10 along the circumferential direction, with the axis of the positioning shaft hole 12 as the center. During assembly, there is a certain installation angle relationship between the induction coil 40 and the permanent magnet 20. The arc-shaped adjustment connection holes 13 are arranged to adjust the installation angle of the magnetic motor rotor on the crankshaft to ensure the installation angle of the permanent magnet 20 and the induction coil 40.

[0056] Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An aircraft engine magneto rotor, mounted on a crankshaft and used in conjunction with a stator disc, characterized by: The magneto rotor comprises a disk body made of aluminum alloy material, on the outer circumferential surface of which a number of permanent magnets for generating magnetic fields and triggering ignition signals are uniformly embedded, and the magnetic pole directions of the permanent magnets are arranged along the circumference of the disk body.

2. An aircraft engine magneto rotor as claimed in claim 1, characterized in that: Four arc-shaped avoidance grooves are evenly arranged on the outer circumferential surface of the disc body.

3. The aircraft engine magneto rotor according to claim 1, characterized in that: Weight reduction structures are evenly arranged on the disc body along the circumferential direction.

4. The aircraft engine magneto rotor according to claim 1, characterized in that: The length of the permanent magnet embedded in the disk body is greater than the length of the permanent magnet exposed outside the disk body.

5. The aircraft engine magneto rotor according to claim 1, characterized in that: A positioning shaft hole is arranged at the center of the disc body.

6. An aircraft engine magneto rotor as claimed in claim 5, characterized in that: A plurality of arc-shaped adjusting connection holes are evenly arranged on the disc body along the circumferential direction and take the axis of the positioning shaft hole as the center.

7. The aircraft engine magneto rotor according to claim 1, characterized in that: Two permanent magnets are evenly arranged on the outer circumferential surface of the disk body.

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