阅读说明：本技术 一种发动机的减速系统 (Speed reducing system of engine ) 是由 王耀坤 付宁 林招如 于 2021-10-08 设计创作，主要内容包括：本发明针对长航时无人机需求,提出了一种发动机的减速系统。该动力系统按功能可以分为两个单元,即：离合装置、减速系统和发电机支撑系统。离合装置是根据发动机转速来控制发动机动力传输与中断的单元。减速系统是将发动机转速实现降低的工作单元,以达到发动机效率最佳的工作转速与螺旋桨转速相匹配的功用。发电机支撑系统用以给机载发电机提供支撑。该发明设计了多种零件来在实现减速系统功能的同时保证其具备高可靠性。根据本发明的一种发动机的减速系统,可以在实现发动机转速降低的同时,保持较轻的整体重量和极高的可靠性,保障无人机的长航时飞行。(The invention provides a speed reducing system of an engine aiming at the requirement of an unmanned aerial vehicle during long endurance. The power system can be divided into two units according to functions, namely: clutch, deceleration system and generator support system. The clutch device is a unit that controls transmission and interruption of engine power according to the engine speed. The speed reducing system is a working unit for reducing the rotating speed of the engine so as to achieve the function of matching the working rotating speed with the rotating speed of the propeller, wherein the working rotating speed is the best in efficiency of the engine. The generator support system is configured to provide support to an onboard generator. The invention designs various parts to realize the function of the speed reducing system and ensure high reliability. According to the speed reducing system of the engine, the rotating speed of the engine can be reduced, meanwhile, the light overall weight and the extremely high reliability are kept, and the long-endurance flight of the unmanned aerial vehicle is guaranteed.)

1. A deceleration system of an engine, characterized by comprising:

an engine (4) as a power output unit with an engine fan cover (15),

a speed reducer (5) fixed to an engine fan cover (15),

a clutch device arranged between the engine (4) and the reducer (5) for realizing power transmission between the engine (4) and the reducer (5),

the output power of the engine (4) is transmitted to the integrated driving wheel through the clutch device,

a poly V-belt (3), an integrated driving wheel transmits a part of the output power of the engine (4) through the poly V-belt (3),

the integrated driven wheel is driven by the integrated driving wheel through the synchronous belt (2), and then the generator (1) is driven to achieve the purpose of airborne power generation.

2. The deceleration system according to claim 1, wherein said clutch means comprises:

a centrifugal throwing block and a friction bowl (20), wherein the centrifugal throwing block comprises two crescent parts (13) and a tension spring (16),

two crescent parts (13) are fixed on the rotary output end (14) of the engine through two centrifugal swing block fixing bolts (17),

one end of the crescent part (13) is fixed, the other end of the crescent part (13) swings outwards under the rotation of the engine (4), the centrifugal force of the crescent part increases along with the increase of the rotating speed of the engine (4), the crescent part (13) contacts with the inner wall of the friction bowl (20) after the engine (4) reaches the preset rotating speed and generates positive pressure, and the transmission of the power of the engine (4) is realized through the friction force of the crescent part and the friction bowl,

two crescent parts (13) are connected through a tension spring (16) positioned in the middle, and when the rotating speed of the engine (4) is low, the tension spring (16) pulls the two crescent parts (13) to contract inwards, so that the crescent parts (13) are separated from the inner wall of the friction bowl (20), and the transmission of power is interrupted.

3. The retarding system according to claim 1, characterized in that:

the speed reducer (5) reduces the rotating speed of the rotating output end (14) of the engine by adopting a multi-wedge belt (3) transmission mode to realize the function of rotating speed matching,

the speed reducer (5) comprises a belt pulley fixing plate (23) for providing a mounting platform for components such as an integrated driving belt pulley (8), a multi-wedge belt pulley (11) and the like,

the friction bowl outer bearing fixing hole (29) and the friction bowl inner bearing fixing hole (27) are respectively arranged in a friction bowl positioning bearing (45)

Wherein:

a clamp spring groove (28) is arranged between the inner bearing fixing hole and the outer bearing fixing hole of the belt pulley fixing plate (23), the friction bowl positioning bearing (45) is installed and fixed by matching with a clamp spring (46) of the belt pulley fixing plate,

the belt pulley fixing plate (23) is provided with a parallel shaft mounting hole (26), the parallel shaft mounting hole (26) is provided with a cutting groove (25), a parallel shaft fastening bolt (40) is screwed between the parallel shaft fastening bolt through hole (24) and the parallel shaft fastening bolt threaded hole (47), so that the belt pulley fixing plate (23) tightly holds the parallel shaft (55) to realize the fixed connection between the belt pulley fixing plate (23) and the parallel shaft (55),

the speed reducer (5) is positioned by four baffle sheets (12) which are distributed on the inner ring of the engine fan cover (15) and are tightly matched with the inner ring of the engine fan cover (15), and is fixed on the engine fan cover (15) by four speed reducer mounting bolts (10),

the belt pulley fixing plate (23) realizes the positioning of the belt pulley fixing plate and an engine fan cover (15) through a baffle plate (12).

4. The retarding system according to claim 3, characterized in that:

the integrated driving wheel comprises an integrated driving wheel belt wheel (8) and an integrated driving wheel retainer ring (9) which are assembled together,

the integrated driving wheel retainer ring (9) is fixed in a threaded hole of the integrated driving wheel belt wheel (8) through a driving wheel retainer ring fastening screw (48) to realize the restraint of the synchronous belt (2),

wherein:

the integrated driving wheel belt wheel comprises a multi-wedge belt groove (30) and a synchronous belt groove (33) which are combined into a whole, and is provided with a driving wheel transition fillet (32), the driving wheel transition fillet (32) is used for preventing the synchronous belt (2) from moving along the axial direction of the belt wheel during transmission and clinging to the multi-wedge belt groove (30) to cause abrasion,

the integrated driving wheel belt wheel (8) comprises an integrated driving wheel hole (35) matched with the friction bowl shaft end platform (19) and is used for being matched with the friction bowl shaft end platform (19) of the speed reducer (5) and eliminating relative rotation between the friction bowl shaft end platform and the friction bowl shaft end platform,

the shaft shoulder (31) of the integrated driving wheel is tightly attached to the transmission shaft (22) of the friction bowl to realize connection.

5. The retarding system according to claim 3, characterized in that:

the belt pulley fixing plate (23) is fixedly connected with the generator frame (43) through four generator frame connecting bolts (70), an adjusting gasket (42) is added between the belt pulley fixing plate (23) and the generator frame (43) and is used for adjusting the tensioning of the synchronous belt (2),

after the power output by the engine (4) is transmitted to the friction bowl (20) through the centrifugal throwing block, the friction bowl (20) is matched with an integrated driving wheel hole (35) of the integrated driving wheel through a shaft end platform (19), the integrated driving wheel drives the multi-wedge belt wheel (11) to reduce the rotating speed through the transmission of the multi-wedge belt (3) so as to output lower rotating speed,

the integrated driving wheel drives the integrated driven wheel to rotate through the transmission of the synchronous belt (2), the integrated driven wheel is connected to the generator (1) through six driven wheel mounting bolts (44), the integrated driving wheel drives the generator (1) to realize the onboard power generation capacity,

in order to reduce the external load applied to a friction bowl transmission shaft (22) by the tension force of the V-ribbed belt (3) and the synchronous belt (2), the V-ribbed belt (3) and the synchronous belt (2) are symmetrically arranged, the V-ribbed belt wheel (11) is arranged below, and the integrated driven wheel is arranged above.

6. The retarding system according to claim 3, characterized in that:

two same friction bowl positioning bearings (45) are respectively pressed into the belt pulley fixing plate (23) from the front and the back of the belt pulley fixing plate (23), a belt pulley fixing plate clamp spring (46) is arranged in the belt pulley fixing plate (23) to limit the friction bowl positioning bearings (45) so as to provide support for a friction bowl transmission shaft (22) penetrating through a bearing inner hole of the friction bowl positioning bearings (45),

the friction bowl shaft shoulder (18) is tightly attached to the inner ring of the friction bowl positioning bearing (45) and is matched with a belt pulley fixing plate clamp spring (46) positioned in the belt pulley fixing plate (23), so that the friction bowl positioning bearing (45) is completely restrained,

the friction bowl positioning bearings (45) at the symmetrical positions are tightly attached to the integrated driving wheel belt wheel (8) through a belt wheel fixing plate clamp spring (46) to realize complete restraint,

the driving wheel fastening screw (50) and the driving wheel gasket (49) are matched together to realize the fixed connection of the integrated driving wheel and the friction bowl (20).

7. The retarding system according to claim 3, characterized in that:

the core component of the multi-wedge belt (3) in the tensioning process is a parallel shaft (55),

the big end (58) of the parallel shaft extends into a parallel shaft mounting hole (26) in the belt pulley fixing plate (23),

a shaft shoulder (57) at the end of the belt pulley fixing plate is tightly attached to the belt pulley fixing plate (23),

the parallel shaft gasket (56) and the parallel shaft positioning bolt (39) are screwed into the belt pulley fixing threaded hole (63), so that the parallel shaft (55) and the belt pulley fixing plate (23) are axially fixed,

the small ends (62) of the parallel shafts penetrate into bearing holes of two multi-wedge pulley bearings (51),

the shaft shoulder (61) at the end of the multi-wedge belt pulley is tightly attached to the multi-wedge belt pulley (11), the multi-wedge belt pulley (11) is axially fixed with the parallel shaft (55) through a multi-wedge belt pulley gasket (52) and a multi-wedge belt pulley fastening bolt (53),

the installation mode of the multi-wedge belt wheel bearing (51) is the same as that of the friction bowl positioning bearing (45), namely, the multi-wedge belt wheel bearing (51) is installed at the front side and the rear side of the multi-wedge belt wheel clamp spring (54),

the major axis (60) of the parallel axis is not collinear with the minor axis (59) of the parallel axis;

the position of the multi-wedge belt wheel (11) on the belt wheel fixing plate (23) can be adjusted by rotating the parallel shaft (55), and further the axial distance between the integrated driving wheel and the multi-wedge belt wheel (11) is adjusted, so that the multi-wedge belt (3) is tensioned,

the parallel shaft fastening bolt (40) is screwed into the belt pulley fixing plate (23) so as to clamp the parallel shaft (55), and the function of maintaining the tensioning state of the V-ribbed belt (3) is realized.

8. The retarding system according to claim 7, characterized in that:

in order to ensure the reliability of the tensioning mechanism of the V-ribbed belt (3), a locking nut (41) is screwed in the outer side of the parallel shaft fastening bolt (40).

9. The retarding system according to claim 3, further comprising:

the cutting round hole (34) is arranged at the boundary position of the edge line of the integrated driving wheel hole (35) and used for compensating the machining error of the driving wheel hole (35) so as to avoid the difficulty of matching the driving wheel hole (35) with the friction bowl shaft end platform (19).

10. The retarding system according to claim 5, characterized in that:

the belt pulley fixing plate (23) comprises a generator supporting platform (71) used for installing a generator (1) above the belt pulley fixing plate (23),

the generator supporting platform (71) and the belt pulley fixing plate (23) are designed into a whole,

the generator support platform (71) is provided with a generator frame mounting hole (72), and the connection of the belt pulley fixing plate (23) and the generator frame (43) is realized through a generator frame connecting bolt (70) penetrating through the generator frame mounting hole (72) and the generator frame connecting hole (65).

Technical Field

The present invention relates to a deceleration system of an engine.

Background

At present, the endurance time of the small-sized long-endurance unmanned aerial vehicle in China is generally concentrated on 10-20 hours, and the small-sized long-endurance unmanned aerial vehicle is difficult to meet the actual use requirement in the military and civil fields of border patrol, communication relay, forest fire prevention and the like. When developing a small long-endurance drone with longer endurance flight capabilities, the power system is one of the essential key systems.

In the flight process of the small-sized long-endurance unmanned aerial vehicle, a power system with high efficiency and light weight is one of core technologies for obtaining the ultra-long endurance time of the unmanned aerial vehicle. In the process of long-time continuous operation of a power system of the unmanned aerial vehicle, reliability is a key index for checking the design rationality of the power system.

Disclosure of Invention

Aiming at the problems in the prior art, on the premise of balancing the actual application of the power system and the current situation of the processing technology, the invention adopts different design and processing schemes compared with the traditional scheme for some parts and simultaneously carries out innovative design on the overall layout and transmission form, thereby realizing the power system with high efficiency, light weight and high reliability.

The invention provides a speed reducing system of an engine, which is mainly suitable for a power system of an unmanned aerial vehicle during long-endurance flight. The invention is mainly characterized in that a power system with high reliability and high efficiency is realized under the condition of lighter structure weight, and the long-endurance flight of the unmanned aerial vehicle is ensured. The invention carries out reasonable design on the whole structure, simultaneously carries out optimized design on key components, ensures that the system has high efficiency and high reliability, and in addition, the invention also carries out reasonable weight reduction design on the component structure while ensuring the reliability and the efficiency.

The invention is realized by reasonable design, assembly and debugging of the clutch device and the deceleration system.

According to an aspect of the present invention, there is provided a deceleration system of an engine, characterized by comprising:

the engine is used as a power output unit and is provided with an engine fan cover,

a speed reducer fixed on the fan cover of the engine,

a clutch device arranged between the engine and the reducer for realizing power transmission between the engine and the reducer,

the output power of the engine is transmitted to the integrated driving wheel through the clutch device,

the integrated driving wheel transmits a part of the output power of the engine through the V-ribbed belt,

the integrated driven wheel is driven by the integration action wheel through the hold-in range drive integration from the driving wheel, and then drives the generator and realizes the purpose of machine-carried electricity generation.

Drawings

Fig. 1 and 2 are an overall structural view and a partial exploded view of a deceleration system of an engine according to an embodiment of the present invention, respectively.

Fig. 3 and 4 are left and isometric views, respectively, of a friction bowl according to an embodiment of the present invention.

FIG. 5 is an isometric view of a pulley retainer plate according to an embodiment of the present invention.

Fig. 6 and 7 are a right side view and a front view, respectively, of an integrated primary pulley in accordance with one embodiment of the present invention.

Fig. 8 and 9 are rear and front views of a decelerator according to an embodiment of the present invention.

Fig. 10 and 11 are an exploded view and a cross-sectional view of a pulley fixing plate and friction bowl connecting portion, respectively, according to an embodiment of the present invention.

Figure 12 is an exploded view of a pulley retainer plate and multi-v pulley coupling in accordance with one embodiment of the present invention.

Fig. 13 and 14 are a front view in parallel and an isometric view in parallel, respectively, of an embodiment of the present invention.

Fig. 15 is an exploded view of the generator and generator frame connection.

Fig. 16 is an isometric view of an integrated driven pulley.

FIG. 17 is an exploded view of the connection portion of the pulley fixing plate and the generator frame.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

1) Integral structure

The overall structure of a deceleration system of an engine according to an embodiment of the present invention is shown in fig. 1, and a partial exploded view thereof is shown in fig. 2; in the power system, an engine (4) is used as a power output unit, a speed reducer (5) is positioned by being distributed on four separation blades (12) which are tightly matched with an inner ring of an engine fan cover (15), and is fixed on the engine fan cover (15) by four speed reducer mounting bolts (10). The engine fan cover (15) and the internal engine cooling fan form a cooling unit of the engine (4). The power transmission between the engine (4) and the speed reducer (5) is realized through a clutch device positioned between the engine and the speed reducer, the output power of the engine (4) is transmitted to the integrated driving wheel through the clutch device, the integrated driving wheel transmits the main output power of the engine (4) through the V-ribbed belt (3), and meanwhile, the integrated driving wheel also drives the integrated driven wheel through the synchronous belt (2), so that the purpose of airborne power generation is realized by driving the generator (1).

2) Clutch device

A left side view of a friction bowl according to one embodiment of the present invention is shown in fig. 3 and an isometric view is shown in fig. 4. The clutch device of the power system comprises a centrifugal throwing block and a friction bowl (20), wherein the centrifugal throwing block comprises two crescent parts (13) and a tension spring (16), the two crescent parts (13) are fixed to an engine rotation output end (14) through two centrifugal throwing block fixing bolts (17), one end of each crescent part (13) is fixed, the other end of each crescent part (13) swings outwards when the engine (4) rotates, and the centrifugal force of each crescent part increases along with the increase of the rotation speed of the engine (4). After the engine (4) reaches a certain rotating speed, the crescent part (13) is in contact with the inner wall of the friction bowl (20) and generates positive pressure, and further the power transmission of the engine (4) is realized through the friction force of the crescent part and the friction bowl. Two crescent parts (13) are connected through a tension spring (16) positioned in the middle, and when the rotating speed of the engine (4) is low, the tension spring (16) pulls the two crescent parts (13) to contract inwards, so that the crescent parts (13) are separated from the inner wall of the friction bowl (20), and the interruption of power transmission is realized.

3) Deceleration system

According to the speed reducing system, the rotating speed of the rotating output end (14) of the engine is reduced in a multi-wedge belt (3) transmission mode, and the rotating speed matching function is achieved. The innovative design of the various components in the deceleration system according to one embodiment of the invention is described in detail below:

3-1) Belt pulley fixing plate

An isometric view of a pulley retainer plate (23) according to one embodiment of the present invention is shown in FIG. 5. The belt pulley fixing plate (23) is used for providing a mounting platform for components such as an integrated driving belt pulley (8), a multi-wedge belt pulley (11) and the like. The friction bowl outer bearing fixing holes (29) and the friction bowl inner bearing fixing holes (27) are respectively filled with friction bowl positioning bearings (45), clamping spring grooves (28) are formed in the belt pulley fixing plates (23) between the inner bearing fixing holes and the outer bearing fixing holes, and the friction bowl positioning bearings (45) are installed and fixed by matching with the clamping springs (46) of the belt pulley fixing plates. The belt pulley fixing plate (23) is provided with a parallel shaft mounting hole (26), the parallel shaft mounting hole (26) is provided with a cutting groove (25), and a parallel shaft fastening bolt (40) is screwed between the parallel shaft fastening bolt through hole (24) and the parallel shaft fastening bolt threaded hole (47), so that the belt pulley fixing plate (23) tightly holds the parallel shaft (55), and the fixed connection between the belt pulley fixing plate (23) and the parallel shaft (55) is realized. The belt pulley fixing plate (23) realizes the positioning of the belt pulley fixing plate and an engine fan cover (15) through a baffle plate (12).

3-2) integrated driving wheel

The integrated driving wheel is formed by assembling an integrated driving wheel belt wheel (8) and an integrated driving wheel retainer ring (9), and the integrated driving wheel retainer ring (9) is fixed in a threaded hole of the integrated driving wheel belt wheel (8) through a driving wheel retainer ring fastening screw (48) to realize the restraint of the synchronous belt (2). The right view of the integrated driving wheel belt wheel is shown in fig. 6, the front view of the integrated driving wheel belt wheel is shown in fig. 7, the integrated driving wheel belt wheel is formed by combining a multi-wedge belt groove (30) and a synchronous belt groove (33) into a whole, and a driving wheel transition fillet (32) is designed in order to prevent the synchronous belt (2) from moving along the axial direction of the belt wheel during transmission and being tightly attached to the multi-wedge belt groove (30) to cause abrasion. And the integrated driving wheel belt wheel (8) is connected with the rest parts of the speed reducer (5) and is provided with an integrated driving wheel hole (35) matched with the friction bowl shaft end platform (19) and used for being matched with the friction bowl shaft end platform (19) of the speed reducer (5) and eliminating relative rotation between the friction bowl shaft end platform and the friction bowl shaft end platform. The shaft shoulder (31) of the integrated driving wheel is tightly attached to the transmission shaft (22) of the friction bowl to realize connection. In order to overcome the difficulty that the driving wheel hole (35) is matched with the friction bowl shaft end platform (19) due to the fact that a large machining error exists in the driving wheel hole (35), a cutting round hole (34) is designed at the boundary position of the edge line of the integrated driving wheel hole (35).

3-3) integral framework of reducer

The rear view of the reducer is shown in fig. 8, and the front view thereof is shown in fig. 9. The belt pulley fixing plate (23) is positioned with an engine fan cover (15) at the front end of an engine (4) through four blocking pieces (12), the belt pulley fixing plate is fixedly installed through four speed reducer installing bolts (10), the belt pulley fixing plate (23) is fixedly connected with a generator frame (43) through four generator frame connecting bolts (70), and an adjusting gasket (42) is added between the belt pulley fixing plate (23) and the generator frame (43) and used for adjusting tensioning of a synchronous belt (2). The belt pulley fixing plate (23) is assembled with the friction bowl (20) to realize the positioning and supporting functions of the friction bowl (20). After the power of engine (4) output is transmitted friction bowl (20) through centrifugal flail block, friction bowl (20) cooperate through axle head platform (19) and integrated driving wheel hole (35) of integration action wheel, the driven scheme of integration action wheel via polywedge bet (3), drive reduction that polywedge band pulley (11) realized the rotational speed, and then export lower rotational speed, the integration action wheel is via hold-in range (2) driven scheme, it is rotatory to drive the integration from the driving wheel, the integration is connected to generator (1) from driving wheel via six from driving wheel construction bolt (44), realize that the integration action wheel drives generator (1) and realizes machine-carried generating capacity. In order to reduce the external load applied to a friction bowl transmission shaft (22) by the tension force of the V-ribbed belt (3) and the synchronous belt (2), the V-ribbed belt (3) and the synchronous belt (2) are symmetrically arranged, the V-ribbed belt wheel (11) is arranged below, and the integrated driven wheel is arranged above.

3-4) fixing device of friction bowl

Fig. 10 is an exploded view of a coupling portion of a pulley fixing plate and a friction bowl, and fig. 11 is a sectional view of the coupling portion of the pulley fixing plate and the friction bowl. Two same friction bowl location bearings (45) are pressed into the belt pulley fixed plate (23) from the front and back of the belt pulley fixed plate (23) respectively, and a belt pulley fixed plate clamp spring (46) is installed in the belt pulley fixed plate (23) to limit the friction bowl location bearings (45) so as to support a friction bowl transmission shaft (22) penetrating into a bearing inner hole of the friction bowl location bearings (45). Inner ring of friction bowl location bearing (45) is hugged closely in friction bowl shoulder (18), cooperate with belt pulley fixed plate jump ring (46) that are located belt pulley fixed plate (23) inside, make this friction bowl location bearing (45) realize the complete restraint, the friction bowl location bearing (45) of symmetric position passes through belt pulley fixed plate jump ring (46) and realizes the complete restraint with closely laminating of integration action wheel band pulley (8), the integration action wheel passes through action wheel fastening screw (50) with being connected of friction bowl (20), action wheel gasket (49) cooperate jointly, action wheel retaining ring fastening screw (48) screw in friction bowl axle head screw thread (21), realize linking firmly of integration action wheel and friction bowl (20).

3-5) multi-wedge belt tensioning device

An exploded view of the connecting portion of the pulley holding plate and the multi-wedge pulley is shown in fig. 12. The core component of the v-ribbed belt (3) during tensioning is a parallel shaft (55), which is shown in a front view in fig. 13 and in an isometric view in fig. 14. The large end (58) of the parallel shaft extends into a parallel shaft mounting hole (26) in the belt pulley fixing plate (23), a shaft shoulder (57) at the end of the belt pulley fixing plate is tightly attached to the belt pulley fixing plate (23), and a parallel shaft gasket (56) and a parallel shaft positioning bolt (39) are screwed into a belt pulley fixing threaded hole (63) to axially fix the parallel shaft (55) and the belt pulley fixing plate (23); the small end (62) of the parallel shaft extends into bearing holes of two multi-wedge belt wheel bearings (51), a shaft shoulder (61) at the end of the multi-wedge belt wheel is tightly attached to the multi-wedge belt wheel (11), and the multi-wedge belt wheel (11) and the parallel shaft (55) are axially fixed through a multi-wedge belt wheel gasket (52) and a multi-wedge belt wheel fastening bolt (53). The installation mode of the multi-wedge belt pulley bearing (51) is the same as that of the friction bowl positioning bearing (45), namely, the multi-wedge belt pulley bearing (51) is installed on the front side and the rear side of the multi-wedge belt pulley clamp spring (54). The central line (60) of the large end of the parallel shaft and the central line (59) of the small end of the parallel shaft are not collinear; the position of the multi-wedge belt wheel (11) on the belt wheel fixing plate (23) can be adjusted by rotating the parallel shaft (55), and further the axial distance between the integrated driving wheel and the multi-wedge belt wheel (11) is adjusted, so that the multi-wedge belt (3) is tensioned. The parallel shaft fastening bolt (40) is screwed into the belt pulley fixing plate (23) to clamp the parallel shaft (55), so that the function of maintaining the tensioning state of the V-ribbed belt (3) is realized. In order to ensure the reliability of the tensioning mechanism of the V-ribbed belt (3), a locking nut (41) is screwed in the outer side of the parallel shaft fastening bolt (40).

4) Generator support system

In order to expand the onboard power generation function, the pulley fixing plate (23) and the integrated driving pulley (8) are designed in a targeted mode according to one embodiment of the invention. The pulley fixing plate (23) and the generator frame (43) are connected in an exploded view as shown in fig. 17, and the pulley fixing plate (23) is provided with a generator supporting platform (71) for mounting the generator (1) above the pulley fixing plate (23). Generator support platform (71) and belt pulley fixed plate (23) design as an organic whole, generator frame mounting hole (72) have been arranged in generator support platform (71), penetrate generator frame connecting bolt (70) among generator frame mounting hole (72) and generator frame connecting hole (65), generator frame connecting bolt (70) screw in generator frame coupling nut (69), realize belt pulley fixed plate (23) and generator frame (43) be connected.

The right view of integration action wheel band pulley is shown in fig. 6, and integration action wheel band pulley (8) have set up hold-in range slot (33), realize that the integration action wheel passes through hold-in range (2) and drives the rotation of integration driven wheel, and generator (1) links firmly to the integration driven wheel, realizes that engine (4) part power transmits generator (1).

5) Integral structure of airborne power generation system

A partial explosion diagram of a speed reducing system of an engine is shown in figure 2, a speed reducer (11) is installed on the engine (4), and the engine (4) works to output power. The integrated driving wheel drives the integrated driven wheel through the synchronous belt (2), the integrated driven wheel is fixedly connected with the generator (1), and then the purpose that the engine (4) drives the generator (1) to achieve airborne power generation is achieved.

5-1) Integrated driven wheel

The integrated driven wheel is formed by assembling an integrated driven wheel belt wheel (6), an integrated driven wheel retainer ring (7) and a driven wheel retainer ring fastening bolt (64). An isometric view of the integrated driven pulley (6) is shown in fig. 16, which has a design in which timing belt grooves (68) and pulley lands (67) are incorporated into one piece.

5-2) Generator mounting

An exploded view of a connection part of the generator (1) and the generator frame (43) is shown in fig. 15, and the integrated driven wheel pulley (6) is fixedly connected to the generator (1) through a driven wheel mounting bolt (44). The generator (1) penetrates through the generator mounting hole (66) through the generator mounting bolt (36), so that the generator (1) is fixedly connected to the generator frame (43); a bearing fixing ring (38) is arranged on the generator rotating shaft (37) to fix a generator bearing.

5-3) synchronous belt tensioning device

An exploded view of a connection part of the pulley fixing plate (23) and the generator frame (43) is shown in fig. 17; adjusting gaskets (42) are padded between the generator frame (43) and the belt pulley fixing plate (23), generator frame connecting holes (65) are formed in the generator frame (43), and the generator frame (43) and the belt pulley fixing plate (23) are connected through cooperation of generator frame connecting bolts (70) and generator frame connecting nuts (69). By placing adjusting gaskets (42) with different specifications, the distance between the shafts of the integrated driving wheel and the integrated driven wheel can be adjusted, and the tightness of the synchronous belt (2) is further adjusted.

Advantages and/or benefits of the present invention include:

1) the clutch device is arranged between the speed reducer and the engine, so that power is not output when the engine rotates at a low speed and is output when the speed reaches above a critical speed, and the unmanned aircraft is safer in the preparation process before taking off.

2) The multi-wedge belt tension force applied to the transmission shaft in the speed reducer is opposite to the synchronous belt tension force, so that the external load of the transmission shaft and the bearing is reduced, and the working reliability of the transmission shaft is improved.

3) The friction bowl integrates the clutch device and the transmission shaft, so that the reliability is improved.

4) The integrated driving wheel is assembled by the integrated driving wheel belt wheel, the integrated driving wheel retainer ring and the driving wheel fastening bolt, the integrated driving wheel belt wheel integrates the functions of the multi-wedge belt wheel and the synchronous belt wheel, the number of assembly parts is reduced, and the assembly reliability is improved.

5) The center distance between the belt wheels is adjusted by adopting eccentric parallel shafts in the tensioning process of the V-ribbed belt, the tensioning process is simple and easy, the tensioning force is continuously changed in the adjusting process, the fastening bolt is screwed after the adjustment, and the center distance of the belt wheels is not easy to change.

6) The power system adopts a modular design, the assembly process between the engine and the speed reducer is simple, and the quick replacement can be realized only through four bolts.

The specific operation example is as follows:

after the parts of the speed reducer (5) are assembled, after the tension of the V-ribbed belt (3) is within a proper range by rotating the parallel shaft (55), the parallel shaft fastening bolt (40) is screwed into the belt pulley fixing plate (23) to clamp the parallel shaft (55), and the speed reducer (5) is completely assembled.

As shown in figure 2, the speed reducer (5) is quickly mounted on an existing engine (4) through four speed reducer mounting bolts (10), and the power system can be assembled by connecting an output line of the generator (1).

The power system is fixed to a test bed of the engine (4) for testing, an oil circuit and an accelerator control part of the engine (4) are connected, and the engine (4) can be started by installing the propeller and other loads at the output end of the speed reducer (5). When the rotating speed of the engine (4) is low, the clutch device is separated, and the propeller and the generator (1) do not rotate. And after the rotating speed of the engine (4) is higher than the critical rotating speed, the engine (4) drives the speed reducer (5) to realize power transmission.