Mechanical supercharger for an aero-piston engine

Abstract

The application relates to the technical field of mechanical superchargers, and provides a mechanical supercharger for an aero-piston engine, which comprises a front cover, a supercharging shell, a transition plate, a rotor assembly, an input shaft and a synchronous gear assembly, the front cover is connected with one end of the supercharging shell, the transition plate is sealingly arranged between the front cover and the supercharging shell, an oil cavity is formed between the transition plate and the front cover, a rotor cavity is formed between the transition plate and the supercharging shell, the rotor assembly is arranged in the rotor cavity, the synchronous gear assembly is arranged in the oil cavity and is in transmission connection with the rotor assembly, the input shaft is in rotary connection with the front cover, one end of the input shaft is in transmission connection with the synchronous gear assembly, and the other end of the input shaft is provided with a belt pulley and extends out of the front cover. The mechanical supercharger has good heat dissipation and lubrication effects by arranging the synchronous gear assembly in the oil cavity.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mechanical superchargers, and more particularly relates to a mechanical supercharger for an aviation piston engine. BACKGROUND

[0002] Engine superchargers have two major trends of mechanical supercharging and turbocharging, both of which can effectively increase the pressure and density of air entering the intake manifold, so that more air is pressed into the engine, thereby increasing the engine power and also saving fuel and reducing emissions. Compared with turbochargers, mechanical superchargers use a belt-driven method to output torque, have good transient response characteristics, do not need to manufacture high-priced precision parts to increase output, and reduce maintenance costs.

[0003] The mechanical supercharger generally includes a supercharger housing, an input shaft, a synchronous gear assembly and a rotor assembly, and the existing installation method is that the synchronous gear assembly is arranged at one end of the rotor assembly, and the other end is connected with the input shaft. For example, Chinese patents with patent application numbers 202122098834.9 and 202110709610.9 use the existing installation method. In the existing installation method, the heat generated by the synchronous gear assembly during high-speed rotation cannot be effectively dissipated, and the lubrication effect of the synchronous gear assembly cannot be guaranteed. SUMMARY

[0004] The purpose of the embodiment of the application is to provide a mechanical supercharger for an aviation piston engine to solve the technical problems of the existing technology, such as the poor lubrication and heat dissipation effect of the rotor shaft and rotor installation method in the rotor assembly at high rotation speed, the connection method of the input shaft and the synchronous gear in the transmission of the rotation of the crankshaft, and the like.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the application is to provide a mechanical supercharger for an aviation piston engine, which comprises a front cover, a supercharging housing, a transition plate, a rotor assembly, an input shaft and a synchronous gear assembly. The front cover is connected with one end of the supercharging housing. The transition plate is sealingly arranged between the front cover and the supercharging housing. An oil cavity is formed between the transition plate and the front cover, and a rotor cavity is formed between the transition plate and the supercharging housing. The rotor assembly is arranged in the rotor cavity. The synchronous gear assembly is arranged in the oil cavity and is in transmission connection with the rotor assembly. The input shaft is in rotational connection with the front cover, one end of the input shaft is in transmission connection with the synchronous gear assembly, and the other end of the input shaft extends out of the front cover and is provided with a belt pulley.

[0006] In one embodiment, the front cover is provided with a mounting column, one end of the mounting column is provided with a second ball bearing and a sealing baffle, the other end is provided with a fourth ball bearing and a third sealing baffle, the input shaft is rotatably arranged through the second ball bearing and the fifth ball bearing arranged at intervals.

[0007] In one embodiment, the synchronous gear assembly comprises two meshing synchronous gears, each of the synchronous gears is rotatably arranged on the transition plate, the rotor assembly comprises two rotor shafts and rotating rotors arranged on the corresponding rotor shafts, the rotor shafts are drivingly connected with the corresponding synchronous gears, and the input shaft is drivingly connected with one of the synchronous gears through a shaft coupling assembly.

[0008] In one embodiment, the shaft coupling assembly comprises a shaft coupling sleeve, a connecting shaft and a shaft coupling bushing, the shaft coupling sleeve is arranged on the input shaft, the shaft coupling bushing is arranged on one end of the connecting shaft, the other end of the connecting shaft is arranged on the synchronous gear, the shaft coupling sleeve and the shaft coupling bushing are connected, and the shaft coupling bushing is made of Teflon material.

[0009] In one embodiment, the shaft coupling sleeve is arranged on the outer circumferential wall of an inner spline sleeve and is arranged at equal arc distances, three shaft coupling sleeves are arranged at equal arc distances on the input shaft, the connecting shaft and the shaft coupling bushing, and the synchronous gear is provided with a connecting hole for mounting each connecting shaft.

[0010] In one embodiment, the inner wall of the front cover is radially provided with an annular platform, a plurality of pin holes are arranged on the annular platform, a plurality of pin shafts are arranged on the transition plate, the pin shafts are inserted into the pin holes, and a first sealing ring is arranged between the annular platform and the transition plate.

[0011] In one embodiment, the transition plate is provided with a first countersunk hole, the first countersunk hole is provided with a first ball bearing and a second sealing ring, one end of the rotor shaft is rotatably arranged in the first countersunk hole through the second sealing ring and drivingly connected with the synchronous gear through the first ball bearing.

[0012] In one embodiment, one end of the rotor shaft arranged in the first countersunk hole is provided with a threaded hole, the synchronous gear is provided with a second countersunk hole, a fastening screw is arranged through the second countersunk hole and is screwed with the threaded hole to drivingly connect the synchronous gear with the rotor shaft.

[0013] In one embodiment, one end of the rotor shaft is provided with a special-shaped surface, the rotating rotor is provided with a matched special-shaped groove at one end, the other end of the rotor shaft is provided with a limiting bushing, the other end of the rotating rotor is provided with a matched limiting groove, and the other end of the rotor shaft is rotatably arranged in the supercharging housing through a third ball bearing.

[0014] In one embodiment, the supercharging housing is provided with a bypass valve.

[0015] The aviation piston engine mechanical supercharger provided by the application has the beneficial effects that: the transition plate is arranged between the front cover and the supercharging housing to form an oil cavity, and the synchronous gear assembly is arranged in the oil cavity, on one hand, the heat generated by the high-speed rotation of the synchronous gear assembly can be dissipated by the oil in the oil cavity, and on the other hand, the oil in the oil cavity can lubricate the synchronous gear assembly; on the other hand, the synchronous gear assembly is arranged in the oil cavity, so that the input shaft can be directly connected in transmission with the synchronous gear assembly, and the synchronous gear assembly drives the rotor assembly to rotate, thereby shortening the transmission torque between the input shaft and the synchronous gear assembly and ensuring the stability of the rotation of the rotor assembly and the synchronous gear assembly. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort.

[0017] Figure 1 The three-dimensional structure schematic diagram of the mechanical supercharger provided by the embodiment of the application is shown in the figure.

[0018] Figure 2 The front view of the mechanical supercharger provided by the embodiment of the application is shown in the figure.

[0019] Figure 3 The figure is Figure 2 the sectional view of A-A in the figure.

[0020] Figure 4 The figure is Figure 3 the enlarged view of A in the figure.

[0021] Figure 5 The three-dimensional structure schematic diagram of the front cover in the mechanical supercharger provided by the embodiment of the application is shown in the figure.

[0022] Figure 6 The structure schematic diagram of the input shaft, the shaft coupling assembly and the synchronous gear in the mechanical supercharger provided by the embodiment of the application is shown in the figure.

[0023] Figure 7A structure schematic view of a rotor shaft and a rotating rotor in a rotor assembly of a mechanical supercharger is provided for the embodiment of the present application.

[0024] Figure 8 A structure schematic view of a bypass valve in a mechanical supercharger is provided for the embodiment of the present application.

[0025] In the drawings, various reference numbers refer to the following list:

[0026] 1, front cover; 11, annular table; 12, pin hole; 13, mounting column; 14, second ball bearing; 15, sealing ring; 16, fourth ball bearing; 17, third sealing ring; 2, supercharging shell; 3, transition plate; 31, pin shaft; 32, first sealing ring; 33, first countersunk hole; 34, first ball bearing; 35, second sealing ring; 4, rotor assembly; 41, rotor shaft; 411, threaded hole; 412, special-shaped surface; 413, limiting bushing; 42, rotating rotor; 421, special-shaped groove; 43, third ball bearing; 5, input shaft; 51, pulley; 52, external spline; 6, synchronous gear assembly; 61, synchronous gear; 611, connecting hole; 612, second countersunk hole; 613, fastening screw; 7, coupling assembly; 71, internal spline cylinder; 72, coupling sleeve; 73, connecting shaft; 74, coupling bushing; 8, bypass valve; 81, hinge; 82, torsional spring. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0028] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0029] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0030] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as implying or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified.

[0031] As shown in Figures 1-8 A mechanical supercharger for an aviation piston engine is provided in the present application. The mechanical supercharger comprises a front cover 1, a supercharger housing 2, a transition plate 3, a rotor assembly 4, an input shaft 5 and a synchronous gear assembly 6. The front cover 1 and the supercharger housing 2 have cavities inside, and the front cover 1 and the supercharger housing 2 are provided with openings at one end, the opening ends of the front cover 1 and the supercharger housing 2 are butted against each other, and the front cover 1 and the supercharger housing 2 are assembled together by a plurality of bolts or screws. The transition plate 3 is sealingly arranged between the front cover 1 and the supercharger housing 2. Specifically, the transition plate 3 is sealingly connected with the front cover 1, the cavity between the transition plate 3 and the front cover 1 forms an oil chamber, and the oil chamber is filled with oil. The cavity between the transition plate 3 and the supercharger housing 2 forms a rotor cavity.

[0032] The rotor assembly 4 is rotatably arranged in the rotor cavity, the synchronous gear assembly 6 is arranged in the oil chamber, the synchronous gear assembly 6 is drivingly connected with the rotor assembly 4 on the transition plate 3, the input shaft 5 is sealingly rotatably connected with the front cover 1, one end of the input shaft 5 is drivingly connected with the synchronous gear assembly 6 in the oil chamber, and the other end of the input shaft 5 extends out of the front cover 1 and is provided with a belt pulley 51. The belt pulley 51 is used to connect with the engine, the engine drives the input shaft 5 to rotate through the belt pulley 51, the input shaft 5 drives the synchronous gear assembly 6 to rotate, and the synchronous gear assembly 6 drives the rotor assembly 4 to rotate.

[0033] In this embodiment, the transition plate 3 is arranged between the front cover 1 and the supercharger housing 2 to form an oil chamber, and the synchronous gear assembly 6 is arranged in the oil chamber. On the one hand, the heat generated by the high-speed rotation of the synchronous gear assembly 6 can be dissipated by the oil in the oil chamber, and at the same time, the oil in the oil chamber can lubricate the synchronous gear assembly 6. On the other hand, by arranging the synchronous gear assembly 6 in the oil chamber, the input shaft 5 can be directly drivingly connected with the synchronous gear assembly 6, and the synchronous gear assembly 6 can in turn synchronously drive the rotor assembly 4 to rotate, thereby shortening the transmission torque between the input shaft 5 and the synchronous gear assembly 6 and ensuring the stability of the rotation of the rotor assembly 4 and the synchronous gear assembly 6.

[0034] In this embodiment, when designing the front cover 1, the cavity volume inside the front cover 1 is as large as possible under the condition of meeting the installation position and on the basis of meeting the strength and rigidity, so as to increase the oil storage capacity of the cooling oil and enhance the cooling and lubricating effect.

[0035] As Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 shown, in the present embodiment, the front cover 1 is provided with a mounting column 13, which is used to rotate the sealingly mounted input shaft 5. Specifically, one end of the mounting column 13 is provided with a second ball bearing 14 and a sealing retainer ring 15, and the other end is provided with a fourth ball bearing 16 and a third sealing ring 17, the second ball bearing 14 and the fourth ball bearing 16 are located between the sealing retainer ring 15 and the third sealing ring 17, the input shaft 5 is rotatably arranged through the second ball bearing 14 and the fourth ball bearing 16 arranged at intervals, and then the gap between the mounting column 13 and the input shaft 5 is sealed by the sealing retainer ring 15 and the third sealing ring 17. In the present embodiment, the input shaft 5 is rotatably arranged through the second ball bearing 14 and the fourth ball bearing 16 arranged at intervals, which can ensure the coaxial rotation of the input shaft and can withstand high rotation speed, and the rotation speed can reach 11500 rpm. Compared with the prior art in which the input shaft is only supported by the bearing near the pulley end and the other end is connected with the rotor assembly through the shaft coupling, the vibration generated by the mechanical supercharger of the present embodiment is relatively smaller at the same rotation speed. And the input shaft and the shaft coupling in the prior art must be rigidly connected to ensure the transmission of the coaxial rotation of the input shaft. In the present embodiment, the input shaft is ensured to rotate coaxially by the second ball bearing 14 and the fourth ball bearing 16, so the shaft coupling assembly in the present embodiment can be connected in a flexible manner.

[0036] In the present embodiment, the synchronous gear assembly 6 includes two meshing synchronous gears 61, each synchronous gear 61 is rotatably arranged on the transition plate 3, the rotor assembly 4 includes two rotor shafts 41 and rotating rotors 42 arranged on the corresponding rotor shafts 41, the rotating rotors 42 are divided into left rotating rotors and right rotating rotors (wherein the one connected with the input shaft is the driving rotor, and the other is the driven rotor), the two rotating rotors 42 are gap-fitted to avoid sticking due to heat generation during rotation. Among them, the rotor shaft 41 is rotatably connected with the corresponding synchronous gear 61 on the transition plate 3, and the input shaft 5 is rotatably connected with one of the synchronous gears 61 through the shaft coupling assembly 7. The two meshing synchronous gears 61 drive the two rotor shafts 41 to rotate synchronously. In the present embodiment, the synchronous gear 61 has two functions: one is to drive the driven rotor in the rotor assembly 4 to rotate, and the other is to connect the input shaft and the rotor assembly to transmit the rotation motion from the crankshaft. In the prior art, since the rotor assembly is directly connected with the input shaft, the functions of driving the driven rotor to rotate and transmitting the rotation motion of the input shaft are separated.

[0037] As Figures 4-7As shown, in the embodiment, the coupling assembly 7 comprises a coupling sleeve 72, a connecting shaft 73 and a coupling bushing 74. The coupling sleeve 72 is arranged on the input shaft 5, the coupling bushing 74 is arranged on one end of the connecting shaft 73, the other end of the connecting shaft 73 is arranged on the synchronous gear 61, the coupling sleeve 72 and the coupling bushing 74 are connected, and the coupling bushing 74 is made of Teflon material. The coupling bushing 74 is made of Teflon material, and the flexible connection of the coupling sleeve 72 and the coupling bushing 74 is realized by the properties of Teflon material, so that the flexible connection of the input shaft 5, the coupling assembly 7 and the synchronous gear 61 is realized. In the process of transmitting rotary motion, it can play a buffering role, and the coupling bushing 74 can eliminate the coaxiality error generated in the process of manufacturing and assembling.

[0038] Preferably, in the embodiment, the coupling sleeve 72 is arranged on the outer circumferential wall of the inner spline sleeve 71 and is arranged at three equal arc distances, the input shaft 5 is provided with an outer spline 52 connected with the inner spline sleeve 71, the connecting shaft 73 and the coupling bushing 74 are also arranged at three equal arc distances, and the synchronous gear 61 is provided with connecting holes 611 for mounting the connecting shafts 73. The coupling sleeve 72, the connecting shaft 73 and the coupling bushing 74 are arranged at three equal arc distances, the coupling sleeve 72 and the coupling bushing 74 are connected in a sleeving manner, and the connecting shaft 73 is inserted into the synchronous gear 61. In this way, the installation is convenient, and the limiting function is also possessed, so that the synchronous rotation of the input shaft 5 and the synchronous gear 61 is ensured.

[0039] As shown in Figure 4 and Figure 5 As shown, in the embodiment, the inner wall of the front cover 1 is radially provided with an annular platform 11, a plurality of pin holes 12 are arranged on the annular platform 11, a plurality of pin shafts 31 are arranged on the transition plate 3, the pin shafts 31 are inserted into the pin holes 12, the transition plate 3 is lapped on the annular platform 11, and a first sealing ring 32 is arranged between the annular platform 11 and the transition plate 3. The first sealing ring 32 ensures the sealing connection between the transition plate 3 and the front cover 1. Specifically, when the front cover 1 and the supercharging shell 2 are butted by screws or bolts, the supercharging shell 2 will press against the transition plate 3 to ensure the sealing property of the installation of the transition plate 3.

[0040] In the embodiment, the transition plate 3 is provided with a first countersunk hole 33, a first ball bearing 34 and a second sealing ring 35 are arranged in the first countersunk hole 33, one end of the rotor shaft 41 is rotatably extended into the first countersunk hole 33 through the second sealing ring 35 and is drivingly connected with the synchronous gear 61 through the first ball bearing 34. The second sealing ring 35 is used to seal between the rotor shaft 41 and the transition plate 3 to prevent oil from entering the rotor cavity. The outer ring of the first ball bearing 34 is fixed on the transition plate 3, and the inner ring of the first ball bearing 34 is connected with the synchronous gear 61 and the rotor shaft 41 respectively, so as to realize the rotary connection of the synchronous gear 61, the rotor shaft 41 and the transition plate 3.

[0041] Specifically, as shown in Figure 4 , Figure 5 , Figure 6 and Figure 7 , in the present embodiment, the end of the rotor shaft 41 extending into the first counterbore 33 is provided with a threaded hole 411, the synchronous gear 61 is provided with a second counterbore 612, a fastening screw 613 is installed through the second counterbore 612 and screwed with the threaded hole 411 to drive-connect the synchronous gear 61 with the rotor shaft 41. The fastening screw 613 is an internal hexagonal screw. The fastening screw 613, the synchronous gear 61 and the rotor shaft 41 are coaxially arranged to ensure coaxiality. The synchronous gear 61 is connected with the rotor shaft 41 through the fastening screw 613, so that the clearance between the two synchronous gears 61 and the two rotating rotors 42 is conveniently adjusted during assembly. In the prior art, the connection between the rotor shaft and the rotating rotor in the rotor assembly, and the connection between the rotor assembly and the synchronous gear are all through simple interference press fitting. Interference press fitting has the following defects: first, the size of interference is not easy to control, if small, the rotor shaft and the rotating rotor, or the rotor assembly and the synchronous gear will be loose during operation of the mechanical supercharger; if large, the press fitting force will increase during press fitting, the long and small-diameter rotor shaft is easy to be deformed, and the roundness of the rotor after press fitting is out of tolerance, resulting in the rotor assembly being scrapped; second, most importantly, the interference press fitting is irreversible, and the clearances between the left and right rotating rotors and between the rotor assembly and the synchronous gear cannot be changed after press fitting. If the clearance value is found to be not ideal, even if the method can separate the rotor assembly and the synchronous gear, the parts will be damaged to different degrees, which will affect the next assembly.

[0042] As shown in Figure 3 , Figure 4 and Figure 7 , in the present embodiment, the end of the rotor shaft 41 is provided with a special-shaped surface 412, the end of the rotating rotor 42 is provided with a matching special-shaped groove 421, the other end of the rotor shaft 41 is provided with a limiting bushing 413, the other end of the rotating rotor 42 is provided with a matching limiting groove, the other end of the rotor shaft 41 is rotatably arranged in the supercharging housing 2 through the third ball bearing 43, and the limiting bushing 413 is interference-fitted with the rotor shaft 41. The special-shaped surface 412 and the special-shaped groove 421 are matched to limit the one end of the rotor shaft 41 and the rotating rotor 42 in the radial direction, realize transmission of rotary motion and limit the rotating rotor 42 from moving axially relative to the rotor shaft 41, the limiting bushing 413 and the limiting groove limit the axial position of the rotating rotor 42, and ensure that the rotating rotor 42 does not axially move between the special-shaped surface 412 and the limiting bushing 413. The special-shaped surface 412 can be a triangular surface, a quadrangular surface or other multi-surface structures.

[0043] In the embodiment, the front cover 1 is provided with an inlet and an oil outlet, the inlet and the oil outlet are provided with sealing plugs, and the front cover 1 is further provided with an oil mark for detecting the oil amount in the oil cavity.

[0044] In the embodiment, the bypass valve 8 is arranged on the supercharging shell 2 and is used for pressure relief. In the embodiment, the bypass valve 8 comprises a hinge 81 and a torsion spring 82, one connecting block of the hinge 81 is fixed on the supercharging shell 2, and the other connecting block blocks the pressure relief opening on the supercharging shell 2, the torsion spring 82 is arranged on the connecting shaft 73 of the hinge 81 and drives the two connecting blocks to be in an open state, so that the connecting blocks can continuously block the pressure relief opening. Only when the pressure in the supercharging shell 2 is greater than the torsion of the torsion spring 82, the connecting blocks are pushed to rotate, and pressure relief is realized. In the embodiment, the rotor shaft 41 is made of steel material, and the rotating rotor 42 is made of 7075 aluminum material.

[0045] In the embodiment, the mechanical supercharger is calibrated at 11500 revolutions per minute.

[0046] In the embodiment, the oil in the closed oil cavity formed between the front cover 1 and the transition plate 3 can take away the heat generated at high revolutions and lubricate the synchronous gear assembly 6, so that the two synchronous gears 61 will not be "locked", and the rotation flexibility is ensured. In the embodiment, the input shaft 5, the shaft coupling assembly 7 and the synchronous gear 61 are flexibly connected through the Teflon shaft coupling bushing 74, so that the transmission of the rotary motion is more smooth. The rotating rotor 42 made of 7075 material and the rotor shaft 41 made of steel material are connected through the combination of the special-shaped surface 412 and the limiting bushing 413, which reduces the bending deformation of the rotor shaft 41 during assembly, and the rotating rotor 42 does not loosen and axially move under high-speed rotation. Through the transition plate 3, the synchronous gear 61, the input shaft 5 and the rotor shaft 41 are coaxial and the connection is arranged on the transition plate 3, so that the rotary motion from the engine crankshaft can be stably transmitted.

[0047] The above only describes the preferred embodiments of the present application and should not be used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A supercharger for an aero-piston engine, characterized in that, It includes: Front cover (1), supercharging shell (2), transition plate (3), rotor assembly (4), input shaft (5) and synchronous gear assembly (6), the front cover (1) and supercharging shell (2) have cavities, the front cover (1) and supercharging shell (2) are provided with openings at one end, the opening ends of the front cover (1) and supercharging shell (2) are butted to each other and assembled together by a plurality of bolts, the transition plate (3) is sealingly arranged between the front cover (1) and the supercharging shell (2), the inner wall of the front cover (1) is provided with a radial annular platform (11), the transition plate (3) is overlapped on the annular platform (11), a first sealing ring (32) is arranged between the annular platform (11) and the transition plate (3) to realize the sealing connection of the transition plate (3) and the front cover (1), an oil cavity is formed between the transition plate (3) and the front cover (1), oil is arranged in the oil cavity, a rotor cavity is formed between the transition plate (3) and the supercharging shell (2), the rotor assembly (4) is arranged in the rotor cavity, the synchronous gear assembly (6) is arranged in the oil cavity and is in transmission connection with the rotor assembly (4), the input shaft (5) is in rotational connection with the front cover (1), one end of the input shaft (5) is in transmission connection with the synchronous gear assembly (6), and the other end of the input shaft (5) is provided with a belt pulley (51) and extends out of the front cover (1); the front cover (1) is provided with a mounting column (13), one end of the mounting column (13) is provided with a second ball bearing (14) and a sealing baffle (15), and the other end of the mounting column (13) is provided with a fourth ball bearing (16) and a third sealing baffle (17), the input shaft (5) is rotatably arranged through the second ball bearing (14) and the fifth ball bearing (16) arranged at intervals; The rotor assembly (4) includes two rotor shafts (41) and rotating rotors (42) arranged on the corresponding rotor shafts (41), one end of the rotor shaft (41) is provided with a special-shaped surface (412), one end of the rotating rotor (42) is provided with a matching special-shaped groove (421), the other end of the rotor shaft (41) is provided with a limiting bushing (413), and the other end of the rotating rotor (42) is provided with a matching limiting groove, the other end of the rotor shaft (41) is rotatably arranged in the supercharging shell (2) through the third ball bearing (43).

2. The supercharger for an aviation piston engine of claim 1, characterized in that: The synchronous gear assembly (6) includes two meshing synchronous gears (61), each of the synchronous gears (61) is rotatably arranged on the transition plate (3), the rotor shaft (41) is in transmission connection with the corresponding synchronous gear (61), and the input shaft (5) is in transmission connection with one of the synchronous gears (61) through the shaft coupling assembly (7).

3. The supercharger for an aviation piston engine of claim 2, characterized in that: The coupling assembly (7) comprises a coupling sleeve (72), a connecting shaft (73) and a coupling bushing (74), the coupling sleeve (72) is arranged on the input shaft (5), the coupling bushing (74) is arranged on one end of the connecting shaft (73), the other end of the connecting shaft (73) is arranged on the synchronous gear (61), the coupling sleeve (72) and the coupling bushing (74) are connected, and the coupling bushing (74) is made of Teflon material.

4. The supercharger for an aviation piston engine of claim 3, characterized in that: The coupling sleeve (72) is arranged on the outer circumferential wall of the inner spline sleeve (71) and is arranged at three equal arc distances, the input shaft (5) is provided with an outer spline (52) connected with the inner spline sleeve (71), the connecting shaft (73) and the coupling bushing (74) are each arranged at three equal arc distances, and the synchronous gear (61) is provided with a connecting hole (611) for mounting each connecting shaft (73).

5. The supercharger for an aviation piston engine of claim 1, wherein: The inner wall of the front cover (1) is radially provided with an annular table (11), the annular table (11) is provided with a plurality of pin holes (12), the transition plate (3) is provided with a plurality of pin shafts (31), the pin shafts (31) are inserted into the pin holes (12), and the annular table (11) and the transition plate (3) are provided with a first sealing ring (32).

6. The supercharger for an aviation piston engine of claim 5, characterized in that: The transition plate (3) is provided with a first countersunk hole (33), the first countersunk hole (33) is provided with a first ball bearing (34) and a second sealing ring (35), one end of the rotor shaft (41) is rotatably inserted into the first countersunk hole (33) through the second sealing ring (35) and is drivingly connected with the synchronous gear (61) through the first ball bearing (34).

7. The supercharger for an aviation piston engine as claimed in claim 6, characterized in that: One end of the rotor shaft (41) inserted into the first countersunk hole (33) is provided with a threaded hole (411), the synchronous gear (61) is provided with a second countersunk hole (612), a fastening screw (613) is installed through the second countersunk hole (612) and is screwed with the threaded hole (411) to drivingly connect the synchronous gear (61) with the rotor shaft (41).

8. A supercharger for an aviation piston engine according to any one of claims 1-7, characterized in that: The supercharging shell (2) is provided with a bypass valve (8).

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