Forced air cooling triangular rotor engine

Abstract

The invention discloses a forced air cooling triangular rotor engine which comprises an engine body, a front end cover air inlet flow guide cover is installed on the engine body, a front end cover air filter screen is installed on the front end cover air inlet flow guide cover, the engine body is provided with an eccentric shaft, an engine propeller hub is fixedly connected to the eccentric shaft, and a forced cooling centrifugal fan is fixedly connected to the engine propeller hub. The forced cooling centrifugal fan is located on the side, away from the front end cover air inlet guide cover, of the engine, and an engine propeller hub is fixedly connected to the eccentric shaft through a rear spindle bolt. According to the forced cooling centrifugal fan, the working efficiency of a cooling system of the air-cooled rotor engine is enhanced, the incoming flow utilization efficiency and the heat dissipation area utilization rate are improved, the reliability of high-rotating-speed work of the engine is improved, and the overall service life is prolonged.

Description

Technical Field

[0001] This invention relates to the field of engine cooling technology, and in particular to a forced air-cooled triangular rotor engine. Background Technology

[0002] As a highly efficient four-stroke engine, the triangular rotary engine boasts higher power output and lower fuel consumption compared to two-stroke piston engines, giving it a certain advantage in the field of aviation and unmanned aerial vehicle (UAV) power. To ensure a specific power-to-weight ratio, air cooling is often employed. However, as an air-cooled rotary engine, it experiences higher thermal loads under high loads or speeds. The engine block and end caps are prone to thermal deformation, and coatings and seals are susceptible to wear and failure, resulting in a shorter inherent lifespan and impacting engine reliability. Therefore, the efficiency of the cooling system in an air-cooled rotary engine is crucial.

[0003] Existing technical solutions mostly employ the placement of air intakes and guide hoses at the front of the engine to passively cool the engine's triangular rotor via airflow. This results in poor cooling performance, minimal heat removal, and a large frontal area, leading to a less compact overall design. The engine block and end caps integrate cooling fins, cooling channels, and shrouds, but the structure is relatively bulky. Without proper directional airflow, the cooling effect is prone to deterioration, and the utilization rate of the heat dissipation area is low.

[0004] Therefore, a forced air-cooled triangular rotor engine is provided to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a forced air-cooled triangular rotor engine to solve the problems existing in the prior art. It can effectively solve the problem of higher rotor heat load in air-cooled rotor engines, thereby improving performance, greatly improving the working reliability of key components and the whole machine, and ensuring a longer service life of the whole machine.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides a forced air-cooled triangular rotor engine, comprising:

[0007] An engine is provided, on which a front cover air intake shroud is mounted, and a front cover air filter is mounted on the front cover air intake shroud. The engine has an eccentric shaft, on which an engine rotor hub is fixedly connected. On which the engine rotor hub is fixedly connected is a forced cooling centrifugal fan, which is located on the side of the engine away from the front cover air intake shroud. The engine rotor hub is fixedly connected to the eccentric shaft by a rear main shaft bolt.

[0008] Preferably, the forced cooling centrifugal fan has a mounting shaft hole and several mounting through holes, the engine hub is installed in the mounting shaft hole, and centrifugal fan mounting bolts are installed in the mounting through holes. The forced cooling centrifugal fan has a centrally located long fan blade and a centrally located short fan blade.

[0009] Preferably, the engine further includes an engine front cover, a triangular rotor assembly, an engine cylinder block, and an engine rear cover. The triangular rotor assembly is located in the engine cylinder block. The engine front cover and the engine rear cover are both fixedly connected to the engine cylinder block. The eccentric shaft passes through the engine front cover, the triangular rotor assembly, the engine cylinder block, and the engine rear cover. The triangular rotor assembly and the eccentric shaft are drively connected. The forced cooling centrifugal fan abuts against the engine rear cover. The front cover air intake shroud is installed on the engine front cover.

[0010] Preferably, the engine front cover has a front cover air inlet and a front cover cooling cavity, the front cover air inlet is connected to the front cover air inlet guide, the front cover cooling cavity is connected to the front cover air inlet, and the engine front cover also has a front cover main bearing seat.

[0011] Preferably, the triangular rotor assembly has three heat dissipation cavities, the two ends of which are respectively connected to the front cover cooling cavity and the rear cover cooling cavity. A plurality of triangular rotor heat dissipation fins are fixedly connected inside the heat dissipation cavity. The outer surface of the triangular rotor assembly has a front combustion chamber recess and a triangular rotor combustion chamber tail support, and the front combustion chamber recess and the triangular rotor combustion chamber tail support are connected.

[0012] Preferably, the forced cooling centrifugal fan has a double V-shaped sealing groove, the engine rear end cover has a rear end cover stop, the double V-shaped sealing groove is connected to the rear end cover stop, the forced cooling centrifugal fan has a fan guide arc and a centrifugal fan stop, the centrifugal fan stop abuts against the engine rear end cover, the engine rear end cover has a rear end cover cooling cavity, and the engine rear end cover has a rear end cover bearing seat.

[0013] Preferably, the front end cover cooling cavity includes cooling cavity one, cooling cavity two and cooling cavity three, and the rear end cover cooling cavity includes cooling cavity four, cooling cavity five and cooling cavity six.

[0014] Preferably, a plurality of front cover cooling fins are fixedly connected to the outer surface of the engine front cover, and the front cover cooling fins have a rounded arc in the circumferential direction near the incoming flow direction. A plurality of cylinder cooling fins are fixedly connected to the outer surface of the engine cylinder body, and a plurality of rear cover cooling fins are fixedly connected to the outer surface of the engine rear cover. The front cover cooling fins, the cylinder body cooling fins, and the rear cover cooling fins overlap in their circumferential projection planes.

[0015] Preferably, the front cover air intake shroud is mounted on the engine front cover by air intake shroud mounting bolts, and the front cover air filter is mounted inside the front cover air intake shroud by air filter mounting bolts.

[0016] The present invention discloses the following technical effects:

[0017] 1. In this invention, the eccentric shaft of the engine drives the forced cooling centrifugal fan and the engine rotor to rotate. The air filter screen of the front cover is used to filter the air entering the engine. The filtered air enters the engine through the air intake guide of the front cover. After the cold air cools the engine, it flows to the forced cooling centrifugal fan. The forced cooling centrifugal fan throws the airflow of the engine out to all sides.

[0018] 2. In this invention, the working efficiency of the air-cooled rotary engine cooling system is enhanced by forced cooling, the air-cooled engine flow field channel is optimized, the incoming flow utilization efficiency and heat dissipation area utilization rate are improved, the reliability of the engine at medium and high speeds is improved, and the overall service life is extended. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an exploded view of the forced air-cooled triangular rotor engine of the present invention;

[0021] Figure 2 This is a cross-sectional view of the present invention;

[0022] Figure 3 This is a schematic diagram of the complete structure of the engine of the present invention and the flow of the surrounding cooling air;

[0023] Figure 4 This is a schematic diagram of the engine front cover and engine rear cover of the present invention;

[0024] Figure 5 This is a schematic diagram of the forced cooling centrifugal fan structure of the present invention;

[0025] Figure 6 This is a schematic diagram of the triangular rotor assembly structure of the present invention;

[0026] The components include: 1. Front cover air filter; 2. Front cover air inlet shroud; 3. Engine front cover; 4. Eccentric shaft; 5. Triangular rotor assembly; 6. Engine block; 7. Engine rear cover; 8. Forced cooling centrifugal fan; 9. Centrifugal fan mounting bolts; 10. Engine rotor hub; 11. Rear main shaft bolts; 12. Air inlet shroud mounting bolts; 13. Air filter mounting bolts; 301. Front cover air inlet; 302. Front cover cooling chamber; 302-1. Cooling chamber one; 302-2. Cooling... Cavity 2; 302-3, Cooling Cavity 3; 501, Triangular Rotor Heat Dissipation Fins; 502, Front-mounted Combustion Chamber Recess; 503, Triangular Rotor Combustion Chamber Tail Support; 601, Cylinder Block Heat Dissipation Fins; 702-1, Cooling Cavity 4; 702-2, Cooling Cavity 5; 702-3, Cooling Cavity 6; 801, Double V-shaped Sealing Groove; 802, Fan Guide Arc; 803, Centrifugal Fan Stop; 804, Mounting Shaft Hole; 805, Mounting Through Hole; 806, Centrally Positioned Long Fan Blade; 807, Centrally Positioned Short Fan Blade. Detailed Implementation

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Reference Figure 1-6 The present invention provides a forced air-cooled triangular rotor engine, comprising:

[0030] The engine has a front cover air intake shroud 2 installed on it, and a front cover air filter 1 installed on the front cover air intake shroud 2. The engine has an eccentric shaft 4, and an engine rotor hub 10 is fixedly connected to the eccentric shaft 4. A forced cooling centrifugal fan 8 is fixedly connected to the engine rotor hub 10. The forced cooling centrifugal fan 8 is located on the side of the engine away from the front cover air intake shroud 2. The engine rotor hub 10 is fixedly connected to the eccentric shaft 4 by a rear main shaft bolt 11.

[0031] In this device, the engine's eccentric shaft 4 drives the forced cooling centrifugal fan 8 and the engine rotor hub 10 to rotate. The front cover air filter 1 filters the air entering the engine. The filtered air enters the engine through the front cover air inlet guide 2. After cooling the engine, the cold air flows to the forced cooling centrifugal fan 8, which then throws the incoming airflow from the engine outwards. The specific path of the cooling airflow is shown by the arrows. By using forced cooling to enhance the working efficiency of the air-cooled rotor engine cooling system, the airflow channel of the air-cooled engine is optimized, improving the efficiency of incoming airflow utilization and the utilization rate of heat dissipation area. This improves the reliability of the engine during high-speed operation and extends its overall service life. The specific path of the cooling airflow is shown by the arrows.

[0032] The design is further optimized by providing a mounting shaft hole 804 and several mounting through holes 805 on the forced cooling centrifugal fan 8. The engine hub 10 is installed in the mounting shaft hole 804, and centrifugal fan mounting bolts 9 are installed in the mounting through holes 805. The forced cooling centrifugal fan 8 has a centrally located long fan blade 806 and a centrally located short fan blade 807.

[0033] The fan mounting shaft hole 804 is installed on the engine rotor hub 10. The forced cooling centrifugal fan 8 is installed on the engine rotor hub 10 through the centrifugal fan mounting bolt 9. The centrally located long fan blade 806 and the centrally located short fan blade 807 each have 12 fan blades arranged on the centrifugal fan to ensure air output efficiency.

[0034] The centrifugal fan blades adopt a centrally located structure with both long and short blades, which combines the high work capacity of forward-swept blades with the high efficiency of backward-swept blades. The combination of long and short blades results in high airflow density at the fan outlet and a good slip coefficient.

[0035] The engine further optimizes the design by including an engine front cover 3, a triangular rotor assembly 5, an engine cylinder block 6, and an engine rear cover 7. The triangular rotor assembly 5 is located inside the engine cylinder block 6. The engine front cover 3 and the engine rear cover 7 are both fixedly connected to the engine cylinder block 6. An eccentric shaft 4 passes through the engine front cover 3, the triangular rotor assembly 5, the engine cylinder block 6, and the engine rear cover 7. The triangular rotor assembly 5 and the eccentric shaft 4 are connected in a driving relationship. The forced cooling centrifugal fan 8 abuts against the engine rear cover 7. The front cover air intake guide 2 is installed on the engine front cover 3.

[0036] The triangular rotor assembly 5 drives the eccentric shaft 4 to rotate. The air in the front cover air intake shroud 2 passes through the engine front cover 3, the triangular rotor assembly 5 and the engine rear cover 7 to reach the forced cooling centrifugal fan 8. The forced cooling centrifugal fan 8 throws the hot air out to all sides, thereby performing internal forced cooling.

[0037] The design is further optimized by providing an air inlet 301 and a cooling chamber 302 on the engine front cover 3. The air inlet 301 is connected to the air inlet shroud 2, and the cooling chamber 302 is connected to the air inlet 301. The engine front cover 3 also has a main bearing seat 303.

[0038] External cold air flows through the front cover air filter 1, then through the front cover air inlet guide shrouds 2 on the left and right sides, and enters the front cover air inlet 301 and front cover cooling cavity 302 of the engine front cover 3. At the same time, it flows through the outer wall of the front cover main bearing seat 303 to cool the bearing seat.

[0039] The design is further optimized by providing three heat dissipation cavities within the triangular rotor assembly 5. The two ends of each heat dissipation cavity are connected to the front cover cooling cavity 302 and the rear cover cooling cavity 702, respectively. Several triangular rotor heat dissipation fins 501 are fixedly connected within the heat dissipation cavities. A front-mounted combustion chamber recess 502 and a triangular rotor combustion chamber tail support 503 are provided on the outer surface of the triangular rotor assembly 5. The front-mounted combustion chamber recess 502 and the triangular rotor combustion chamber tail support 503 are connected.

[0040] The triangular rotor cooling fins 501 have a certain taper from the root to the top, with the fin tip arc being R0.5 to R0.65, the average thickness at the root being 2mm to 2.5mm, and the average spacing between the fins being 4mm to 5mm. The triangular rotor cooling fins 501 are arranged at a certain angle relative to the front combustion chamber recess 502 of the triangular rotor assembly 5, approximately 70 to 80°. Behind the front combustion chamber recess 502 is the triangular rotor combustion chamber tail support 503, which is inclined to the triangular rotor cooling fins 501 to make full use of the three internal cavities of the triangular rotor and arrange cooling fins with a large heat dissipation area. This ensures that when the engine is rotating, the excess heat from the combustion gases in the front combustion chamber recess 502 and the triangular rotor combustion chamber tail support 503 is effectively dissipated from the top of the triangular rotor.

[0041] In this process, the forced-air cooling centrifugal fan 8 forces the airflow from the front cover cooling cavity 302 to the inclined heat dissipation fins 501 inside the triangular section of the triangular rotor assembly 5. The air then flows out from the rear cover cooling cavity 702 of the engine rear cover 7, carrying away heat from the rear cover bearing housing 703. It then flows to the guide arc 802 of the forced-air cooling centrifugal fan 8 and is finally ejected from the periphery of the forced-air cooling centrifugal fan 8. This process, aided by the suction of the forced-air cooling centrifugal fan 8, increases the flow intensity of the cooling air, thereby enhancing the cooling effect. The specific path of the cooling airflow is illustrated by the arrows.

[0042] The scheme is further optimized by providing a double V-shaped sealing groove 801 on the forced cooling centrifugal fan 8, a rear end cover 7 with a rear end cover stop 701, the double V-shaped sealing groove 801 being connected to the rear end cover stop 701, a fan guide arc 802 and a centrifugal fan stop 803 inside the forced cooling centrifugal fan 8, the centrifugal fan stop 803 abutting against the engine rear end cover 7, a rear end cover cooling cavity 702 body on the engine rear end cover 7, and a rear end cover bearing seat 703 inside the engine rear end cover 7.

[0043] The double V-shaped sealing groove 801 is used in conjunction with the rear end cover stop 701 of the engine rear end cover 7. Its purpose is to reduce the leakage loss of cooling flow from the rear end cover and prevent the fan efficiency from decreasing. The fan guide arc 802 is mainly to reduce the friction resistance. The centrifugal fan stop 803 is close to the engine rear end cover 7, and its purpose is also mainly to prevent leakage loss.

[0044] The scheme is further optimized. The front cover cooling cavity 302 includes cooling cavity one 302-1, cooling cavity two 302-2 and cooling cavity three 302-3, and the rear cover cooling cavity 702 includes cooling cavity four 702-1, cooling cavity five 702-2 and cooling cavity six 702-3.

[0045] Cooling chamber 1 (302-1) has a symmetrical crescent-shaped structure, located near the spark plug side of the engine. Cooling chambers 2 (302-2) and 3 (302-3) are irregularly shaped, located near the exhaust and intake sides of the engine, respectively. Cooling chamber 4 (702-1) also has a symmetrical crescent-shaped structure, located near the spark plug side of the engine. Cooling chambers 5 (702-2) and 6 (702-3) are irregularly shaped, with an overall shape symmetrical to cooling chamber 4 (702-1). However, they have a diagonal rib separating cooling chambers 5 (702-2) and 6 (702-3). The diagonal rib slopes downwards to the right at an angle of 15° to 20° to the short axis of the end cover. Cooling chamber 5 (702-2) is located near the exhaust side of the engine, while cooling chamber 6 (702-3) is located near the intake side. All three cooling chamber structures have the following characteristic: a draft angle, typically 5° to 7°, extending from the rear end cover mounting surface towards the rear. These three cavity structures work together to ensure sufficient cooling of the triangular rotor fins 501 by the incoming airflow during combustion and exhaust, allowing excess heat from the combustion chamber recesses 502 and the combustion chamber tailstock 503 to be carried away to the rear of the engine. The overall temperature distribution of the triangular rotor assembly 5 is more uniform, reducing thermal deformation and stress, and improving operational reliability.

[0046] The scheme is further optimized. Several front cover heat dissipation fins 304 are fixedly connected to the outer surface of the engine front cover 3. The front cover heat dissipation fins 304 have a rounded arc in the circumferential direction near the incoming flow direction. Several cylinder block heat dissipation fins 601 are fixedly connected to the outer surface of the engine cylinder block 6. Several rear cover heat dissipation fins 704 are fixedly connected to the outer surface of the engine rear cover 7. The front cover heat dissipation fins 304, cylinder block heat dissipation fins 601 and rear cover heat dissipation fins 704 coincide along the circumferential projection plane.

[0047] The front cover 3 of the engine is provided with front cover heat dissipation fins 304, which are mainly distributed in the engine thermal arc area. The front cover heat dissipation fins 304 are characterized by an inverted arc structure in the circumferential design of the heat dissipation fins near the direction of incoming flow. This structure can effectively guide the external incoming flow into the outer surface of the heat dissipation fins, reduce flow resistance, and improve the utilization rate of cooling area, i.e., the cooling effect.

[0048] A ring of cooling fins 601 is arranged on the outer surface of the engine block 6, mainly distributed in the thermal arc zone. The cooling fins 601 are characterized by a apex radius of R0.6 to R0.75, a root wall thickness of 3.5 mm to 4 mm, and an overall outward radiating shape. The average gap between the cooling fins is 4 mm to 5 mm. This arrangement allows heat from the inner wall of the engine block to be transferred to the root of the cooling fins (3.5 mm to 4 mm), and then to the top arc of the cooling fins (R1.3 to R1.5). Under the cooling effect of the external airflow, a relatively ideal convective heat transfer effect is generated.

[0049] The outer surface of the engine rear cover 7 is equipped with several rear cover cooling fins 704, mainly distributed in the engine's thermal arc zone. The rear cover cooling fins 704 feature a rounded arc structure in the circumferential design of the cooling fins in the incoming airflow direction. This structure effectively guides the cooling flow from the engine block cooling fins 601 into the outer surface of the engine rear cover cooling fins 704, reducing flow resistance and improving cooling area utilization, i.e., cooling effect. Simultaneously, the engine rear cover cooling fins 704, along with the engine block cooling fins 601 and the front cover cooling fins 304, overlap along their circumferential projection planes, radiating outwards to form neatly arranged cooling channels in the engine's thermal arc zone. This facilitates airflow and allows for effective heat exchange between the engine's internal heat and the cooling fins on the engine's outer surface. This external cooling structure has a compact overall appearance, small size, reduced wind resistance, and relatively low overall weight, which is beneficial for improving the engine's power-to-weight ratio.

[0050] The scheme is further optimized. The forced cooling centrifugal fan 8 is mounted on the engine rotor hub 10 by centrifugal fan mounting bolts 9, the front cover air intake guide 2 is mounted on the engine front cover 3 by air intake guide 2 by air intake guide 12, and the front cover air filter 1 is mounted inside the front cover air intake guide 2 by air filter mounting bolts 13.

[0051] The cooling method for a rotary engine in this invention includes two processes: internal and external.

[0052] The engine's internal cooling process is as follows: First, the fresh airflow passes through the front cover air filter 1, then through the left and right front cover air inlet guide shrouds 2, and enters the front cover air inlet 301 and front cover cooling chamber 302 of the engine front cover 3. Simultaneously, it flows over the outer wall of the front cover main bearing seat 303, cooling both the front cover and the bearing seat. Next, the airflow enters the triangular rotor assembly 5 in the central chamber and flows through the inclined cooling fins 501 within the heat dissipation chamber, effectively dissipating excess heat from the combustion gases in the front combustion chamber recess 502 and the triangular rotor combustion chamber tail support 503, which are then transferred to the top of the triangular rotor. Subsequently, the airflow enters the rear cover cooling chamber 702 of the engine rear cover 7, cooling the rear cover bearing seat 703. Afterward, it flows to the guide arc 802 of the forced cooling centrifugal fan 8 and finally exits from around the forced cooling centrifugal fan 8. This invention designs a forced cooling centrifugal fan, ensuring efficient airflow and enhancing the internal cooling effect of key engine components.

[0053] External engine cooling process: During engine operation, the cooling airflow first flows through the cooling fins 304 of the front cover, then through the cooling fins 601 of the cylinder block, and finally through the cooling fins 704 of the rear cover. The airflow sequentially and effectively cools the front cover 3, the cylinder block 6, and the rear cover 7. This external cooling structure has a compact overall appearance and small size, reducing wind resistance and overall weight, which is beneficial to improving the engine's power-to-weight ratio.

[0054] Advantages of this invention:

[0055] 1. By using forced cooling to enhance the working efficiency of the air-cooled rotary engine cooling system, the air-cooled rotor and its internal and external flow field channels are optimized, improving the efficiency of incoming flow utilization and the utilization rate of heat dissipation area, thus improving the reliability of the engine at medium and high speeds and extending its overall service life.

[0056] 2. Improved engine compactness reduces frontal resistance;

[0057] 3. Effectively reduced the weight of the main structural components.

[0058] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0059] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A forced air-cooled triangular rotor engine, characterized in that, include: An engine is equipped with a front cover air intake shroud (2), and a front cover air filter (1) is installed on the front cover air intake shroud (2). The engine has an eccentric shaft (4), and an engine rotor hub (10) is fixedly connected to the eccentric shaft (4). A forced cooling centrifugal fan (8) is fixedly connected to the engine rotor hub (10). The forced cooling centrifugal fan (8) is located on the side of the engine away from the front cover air intake shroud (2). The engine rotor hub (10) is fixedly connected to the eccentric shaft (4) by a rear main shaft bolt (11).

2. The forced air-cooled triangular rotor engine according to claim 1, characterized in that: The forced cooling centrifugal fan (8) has a mounting shaft hole (804) and several mounting through holes (805). The engine hub (10) is installed in the mounting shaft hole (804). Centrifugal fan mounting bolts (9) are installed in the mounting through holes (805). The forced cooling centrifugal fan (8) has a centrally mounted long fan blade (806) and a centrally mounted short fan blade (807).

3. A forced air-cooled triangular rotor engine according to claim 2, characterized in that: The engine also includes an engine front cover (3), a triangular rotor assembly (5), an engine cylinder (6), and an engine rear cover (7). The triangular rotor assembly (5) is located inside the engine cylinder (6). The engine front cover (3) and the engine rear cover (7) are both fixedly connected to the engine cylinder (6). The eccentric shaft (4) passes through the engine front cover (3), the triangular rotor assembly (5), the engine cylinder (6), and the engine rear cover (7). The triangular rotor assembly (5) and the eccentric shaft (4) are connected in a driving connection. The forced cooling centrifugal fan (8) abuts against the engine rear cover (7). The front cover air intake guide (2) is installed on the engine front cover (3).

4. A forced air-cooled triangular rotor engine according to claim 3, characterized in that: The engine front cover (3) is provided with a front cover air inlet (301) and a front cover cooling cavity (302). The front cover air inlet (301) is connected to the front cover air inlet guide (2). The front cover cooling cavity (302) is connected to the front cover air inlet (301). The engine front cover (3) also has a front cover main bearing seat (303).

5. A forced air-cooled triangular rotor engine according to claim 4, characterized in that: The triangular rotor assembly (5) has three heat dissipation cavities. The two ends of the heat dissipation cavities are connected to the front cover cooling cavity (302) and the rear cover cooling cavity (702) respectively. A number of triangular rotor heat dissipation fins (501) are fixedly connected inside the heat dissipation cavities. The outer surface of the triangular rotor assembly (5) has a front combustion chamber recess (502) and a triangular rotor combustion chamber tail support (503). The front combustion chamber recess (502) and the triangular rotor combustion chamber tail support (503) are connected.

6. A forced air-cooled triangular rotor engine according to claim 5, characterized in that: The forced cooling centrifugal fan (8) has a double V-shaped sealing groove (801), the engine rear end cover (7) has a rear end cover stop (701), the double V-shaped sealing groove (801) is connected to the rear end cover stop (701), the forced cooling centrifugal fan (8) has a fan guide arc (802) and a centrifugal fan stop (803) inside, the centrifugal fan stop (803) abuts against the engine rear end cover (7), the engine rear end cover (7) has a rear end cover cooling cavity (702) body, and the engine rear end cover (7) has a rear end cover bearing seat (703) inside.

7. A forced air-cooled triangular rotor engine according to claim 6, characterized in that: The front cover cooling cavity (302) includes cooling cavity one (302-1), cooling cavity two (302-2) and cooling cavity three (302-3), and the rear cover cooling cavity (702) includes cooling cavity four (702-1), cooling cavity five (702-2) and cooling cavity six (702-3).

8. A forced air-cooled triangular rotor engine according to claim 4, characterized in that: The engine front cover (3) has several front cover heat dissipation fins (304) fixedly connected to its outer surface. The front cover heat dissipation fins (304) have a rounded arc in the circumferential direction near the incoming flow direction. The engine cylinder block (6) has several cylinder block heat dissipation fins (601) fixedly connected to its outer surface. The engine rear cover (7) has several rear cover heat dissipation fins (704) fixedly connected to its outer surface. The front cover heat dissipation fins (304), the cylinder block heat dissipation fins (601) and the rear cover heat dissipation fins (704) coincide along the circumferential projection plane.

9. A forced air-cooled triangular rotor engine according to claim 3, characterized in that: The front cover air intake guide (2) is installed on the engine front cover (3) by air intake guide mounting bolts (12), and the front cover air filter (1) is installed inside the front cover air intake guide (2) by air filter mounting bolts (13).

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