Heat dissipation type two-stroke engine for mower

Abstract

The invention belongs to the technical field of engine heat dissipation, and particularly relates to a heat dissipation type two-stroke engine for a mower, the heat dissipation type two-stroke engine comprises an engine body, a flow guide heat dissipation cover, a main shaft and an auxiliary shaft, the main shaft and the auxiliary shaft are both in power connection with the engine body, and the main shaft and the auxiliary shaft are oppositely arranged; a first heat dissipation assembly and a second heat dissipation assembly are arranged on the main shaft and the auxiliary shaft respectively, a turbofan is arranged on the second heat dissipation assembly and right faces an air outlet of the flow guide heat dissipation cover, and the flow guide heat dissipation cover is arranged on the engine body. According to the heat dissipation type two-stroke engine for the mower, the heat dissipation assemblies are additionally arranged on the main shaft and the auxiliary shaft, heat generated by the main shaft, the auxiliary shaft and the crankcase is dissipated through the heat dissipation assemblies, the flow guide heat dissipation cover is arranged on the cylinder body, negative pressure is formed at the outlet end of the flow guide heat dissipation cover through the turbofan, the air flow speed at the cylinder body is increased, and the heat dissipation efficiency is improved. And the heat dissipation effect is improved, heat dissipation is achieved from multiple positions, and the heat dissipation effect of the engine is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of engine heat dissipation, and in particular relates to a heat dissipation type two-stroke engine for a lawn mower. Background Art

[0002] A lawn mower is a mechanical tool used to trim lawns, vegetation, etc. It consists of a cutter disc, an engine, a running wheel, a running mechanism, a blade, a handrail, and a control part. The cutter disc is mounted on the running wheel, the engine is mounted on the cutter disc, and the blade is mounted on the output shaft of the engine. The blade uses the high-speed rotation of the engine to increase the speed a lot, saving the working time of the weeding workers and reducing a lot of human resources.

[0003] When the lawn mower is working, the engine generates a lot of heat, especially the cylinder part of the engine can generate a high temperature of 2000℃. If the heat is not dissipated in time, it will seriously affect the service life of the engine. Most of the existing two-stroke engine heat dissipation structures simply use fins for heat dissipation, and the heat dissipation effect is not ideal, especially when used in lawn mowers, the air around the engine does not flow as fast as in vehicles, resulting in poor heat dissipation effect; if a water cooling system is installed, the size of the engine will inevitably increase, and a separate pump water power device will be required to increase the cost.

[0004] Therefore, the above problems need to be solved urgently. Summary of the invention

[0005] Purpose of the invention: In order to overcome the above shortcomings, the present invention provides a heat dissipation type two-stroke engine for a lawn mower, which has a simple structure and reasonable design, and can achieve efficient heat dissipation of the two-stroke engine without adding too many components.

[0006] Technical solution: In order to achieve the above-mentioned purpose, the present invention provides a heat dissipation type two-stroke engine for a lawn mower, comprising an engine body, a deflection heat dissipation cover, a main shaft and a secondary shaft, wherein the main shaft and the secondary shaft are both connected to the engine body in a power manner and are arranged opposite to each other; The main shaft and the secondary shaft are respectively provided with a first heat dissipation assembly and a second heat dissipation assembly, the second heat dissipation assembly is provided with a turbofan, the turbofan is directly facing the air outlet of the deflector heat dissipation cover, and the deflector heat dissipation cover is arranged on the engine body.

[0007] The first heat dissipation assembly and the second heat dissipation assembly on the main shaft and the secondary shaft can dissipate the heat from the lower part of the engine, and can also assist the main shaft and the secondary shaft in dissipating heat. The heat guide radiator cover mainly removes the heat generated by the upper part of the engine, thereby improving the heat dissipation effect of the engine from multiple angles.

[0008] Furthermore, the first heat dissipation component and the second heat dissipation component have the same structure, both comprising a turntable, the turntable is cone-shaped, and a plurality of heat dissipation fins are evenly distributed on the conical surface of the turntable.

[0009] The heat on the main shaft or the auxiliary shaft is partially conducted to the heat sink fin 1, and the heat sink fin 1 dissipates the heat as the turntable rotates.

[0010] Furthermore, the heat dissipation fin 1 is fan-blade-shaped, and the heat dissipation fin 1 can draw hot air away from the engine body.

[0011] The heat dissipation fins are arranged in a fan blade shape. When the engine is working, the heat dissipation fins rotate, and negative pressure is formed on the side close to the engine body, thereby discharging the hot air around the engine body, accelerating the air circulation and enhancing the heat dissipation effect.

[0012] Furthermore, a through hole is provided at the center of the turntable, a spline groove is provided in the through hole, and the main shaft and the secondary shaft pass through, are installed, and are limited by the spline groove.

[0013] Furthermore, the engine body includes a crankcase and a cylinder body. The crankcase is provided with a crankshaft, the cylinder body is provided with a piston and a connecting rod, the piston is connected to the crankshaft through the connecting rod, and the main shaft and the secondary shaft are respectively connected to the crankshaft.

[0014] The main shaft is connected to the external mechanism as an output shaft. The heat dissipation structure is set on the main shaft and the secondary shaft. The heat dissipation structure is driven by the engine body. The heat dissipation structure can be started to operate without the need for additional power devices, which saves costs and reduces volume.

[0015] Furthermore, a second heat dissipation fin is arranged on the outer side of the cylinder body, and the bottom of the air-guiding heat dissipation cover is arranged at the intersection of the cylinder body and the crankcase, and the crankcase is located in the air-guiding heat dissipation cover. The heat generated by the cylinder body is discharged through the second heat dissipation fin, and the air-guiding heat dissipation cover can take away the hot air and absorb the cold air at the same time, so as to achieve efficient heat dissipation.

[0016] Furthermore, the top surface of the air guide heat dissipation cover is arc-shaped, and the arc of the top surface of the air guide heat dissipation cover near the air inlet is smaller than that of the air outlet. After entering through the air inlet, the cold air encounters the upper wall with a smaller arc. On the one hand, the cold air returns downward to contact the second heat dissipation fin, and on the other hand, the flow rate of the cold air can be appropriately slowed down so that the cold air can contact the second heat dissipation fin away from the air inlet, thereby improving the heat dissipation effect and making the heat dissipation more uniform. The side with a larger arc is close to the turbofan, and the hot air is quickly discharged under the action of the turbofan.

[0017] Furthermore, the air inlet of the deflecting heat dissipation cover faces obliquely downward, and the air outlet is parallel to the turbofan. The engine of the lawn mower is generally exposed to the outside for better heat dissipation effect. The oblique downward air inlet can effectively prevent rainwater from entering, and the air entering through the air inlet is obliquely upward to form a vortex with the arc-shaped top surface.

[0018] Furthermore, the cylinder body is also provided with an exhaust port, which is located at one side of the air inlet of the air guide and heat dissipation cover. Waste discharged from the exhaust port is immediately discharged from the air outlet under the action of negative pressure.

[0019] It can be seen from the above technical solution that the present invention has the following beneficial effects: 1. The present invention provides a heat dissipation type two-stroke engine for a lawn mower. A heat dissipation component is installed on the main shaft and the secondary shaft. The heat generated by the main shaft, the secondary shaft and the crankcase is dissipated through the heat dissipation component. A guide heat dissipation cover is arranged on the cylinder body. A negative pressure is formed at the outlet end of the guide heat dissipation cover by a turbofan, so as to accelerate the air flow rate at the cylinder body, improve the heat dissipation effect, and realize heat dissipation from multiple places, so that the heat dissipation effect of the engine is greatly improved.

[0020] 2. The heat dissipation component is arranged on the main shaft and the secondary shaft. The upper part of the heat dissipation fin 1 is arranged to dissipate the heat on the shaft. At the same time, the shape of the heat dissipation fin 1 is fan-shaped. When it rotates, the side close to the crankcase is negative pressure, which can remove the heat near the crankcase and further improve the heat dissipation effect.

[0021] 3. The structure of the heat dissipation hood can make the incoming cold air form a swirl, which can increase the air flow rate and enhance heat dissipation, while also making the heat dissipation of the cylinder more uniform.

[0022] 4. The heat dissipation structure of the present invention is simple and is driven by the engine itself, which reduces the size of the engine and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a heat dissipation type two-stroke engine for a lawn mower according to the present invention; Figure 2 It is a schematic structural diagram of the first heat dissipation component (second heat dissipation component) described in the present invention.

[0024] In the figure: 1-engine body, 11-crankcase, 111-crankshaft, 12-cylinder block, 121-piston, 122-connecting rod, 123-exhaust port, 13-second cooling fin, 2-air guide cooling cover, 3-main shaft, 4-secondary shaft, 5-first cooling assembly, 6-second cooling assembly, 61-turntable, 62-first cooling fin, 7-turbofan. DETAILED DESCRIPTION

[0025] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0026] like Figure 1-2 As shown, a heat dissipation type two-stroke engine for a lawn mower comprises an engine body 1, a deflection heat dissipation cover 2, a main shaft 3 and a secondary shaft 4, wherein the main shaft 3 and the secondary shaft 4 are both connected to the engine body 1 in a power manner and are arranged opposite to each other; The main shaft 3 and the secondary shaft 4 are respectively provided with a first heat dissipation component 5 and a second heat dissipation component 6 . The second heat dissipation component 6 is provided with a turbofan 7 . The turbofan faces the air outlet of the air guide heat dissipation cover 2 . The air guide heat dissipation cover 2 is provided on the engine body 1 .

[0027] The first heat dissipation component 5 and the second heat dissipation component 6 have the same structure, both comprising a turntable 61 . The turntable 61 is in a cone shape, and a plurality of heat dissipation fins 62 are evenly distributed on the conical surface of the turntable 61 .

[0028] In a preferred embodiment, the first heat dissipation component 5 and the second heat dissipation component 6 can be made of heat-conductive metal to efficiently conduct the heat on the shaft to the heat dissipation fin 1 62 .

[0029] See also Figure 2 The heat dissipation fin 1 62 is fan-blade-shaped, and the heat dissipation fin 1 62 can draw hot air away from the engine body 1 .

[0030] The center of the rotating disk 61 is provided with a through hole, and a spline groove is provided in the through hole. The main shaft 3 and the secondary shaft 4 pass through and are installed and limited by the spline groove.

[0031] The engine body 1 includes a crankcase 11 and a cylinder block 12. A crankshaft 111 is disposed in the crankcase 11. A piston 121 and a connecting rod 122 are disposed in the cylinder block 12. The piston 121 is connected to the crankshaft 111 via the connecting rod 122. The main shaft 3 and the secondary shaft 4 are connected to the crankshaft 111 respectively.

[0032] In addition, a heat dissipation fin 2 13 is disposed on the outer side of the cylinder body 12 , and the bottom of the air-conducting heat dissipation cover 2 is disposed at the intersection of the cylinder body 12 and the crankcase 11 , and the crankcase 11 is located inside the air-conducting heat dissipation cover 2 .

[0033] Preferably, the top surface of the air-guiding heat-dissipating cover 2 is arc-shaped, and the curvature of the top surface of the air-guiding heat-dissipating cover 2 on the side close to the air inlet is smaller than that on the side close to the air outlet.

[0034] The air inlet of the air-guiding heat-dissipating cover 2 is oriented obliquely downward, and the air outlet is parallel to the turbofan 7 .

[0035] In a further optimized solution, the cylinder body 12 is further provided with an exhaust port 123 , which is located at one side of the air inlet of the deflecting and cooling cover 2 .

[0036] In the present embodiment, a heat dissipation type two-stroke engine for a lawn mower is working, while the crankshaft 111 drives the main shaft 3 to work outward, and the first heat dissipation assembly 5 and the second heat dissipation assembly 6 located on the main shaft 3 and the secondary shaft 4 rotate accordingly. The heat generated by the operation of the main shaft 3 and the secondary shaft 4 is discharged through the heat dissipation fin 1 61, and the heat dissipation fin 1 61 rotates to form a negative pressure on one side of the crankcase 11, thereby taking away the heat of the crankcase 11 accessories, accelerating air circulation to achieve the purpose of heat dissipation; the heat generated by the cylinder body 12 is discharged through the heat dissipation fin 2 13, and when the turbofan 7 rotates, a negative pressure is formed at the air outlet of the guide heat dissipation cover 2, and the external air enters from the air inlet and contacts the heat dissipation fin 2 13 to take away the heat thereon, thereby improving the heat dissipation effect at the cylinder body 12.

[0037] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A heat dissipation type two-stroke engine for a lawn mower, characterized in that: It comprises an engine body (1), a deflection and heat dissipation cover (2), a main shaft (3) and a secondary shaft (4), wherein the main shaft (3) and the secondary shaft (4) are both dynamically connected to the engine body (1) and are arranged opposite to each other; A first heat dissipation assembly (5) and a second heat dissipation assembly (6) are respectively provided on the main shaft (3) and the secondary shaft (4); a turbofan (7) is provided on the second heat dissipation assembly (6); the turbofan is directly opposite to an air outlet of a deflection heat dissipation cover (2); and the deflection heat dissipation cover (2) is provided on the engine body (1).

2. A heat dissipation type two-stroke engine for a lawn mower according to claim 1, characterized in that: The first heat dissipation component (5) and the second heat dissipation component (6) have the same structure and both comprise a turntable (61). The turntable (61) is in a simulated cone shape, and a plurality of heat dissipation fins (62) are evenly distributed on the conical surface of the turntable (61).

3. A heat dissipation type two-stroke engine for a lawn mower according to claim 2, characterized in that: The heat dissipation fin 1 (62) is fan-shaped, and the heat dissipation fin 1 (62) can draw hot air away from the engine body (1).

4. A heat dissipation type two-stroke engine for a lawn mower according to claim 3, characterized in that: A through hole is provided at the centre of the rotating disc (61), a spline groove is provided in the through hole, and the main shaft (3) and the secondary shaft (4) pass through and are installed and limited by the spline groove.

5. A heat dissipation type two-stroke engine for a lawn mower according to claim 1, characterized in that: The engine body (1) comprises a crankcase (11) and a cylinder block (12); a crankshaft (111) is arranged in the crankcase (11); a piston (121) and a connecting rod (122) are arranged in the cylinder block (12); the piston (121) is connected to the crankshaft (111) via the connecting rod (122); and the main shaft (3) and the secondary shaft (4) are respectively connected to the crankshaft (111).

6. A heat dissipation type two-stroke engine for a lawn mower according to claim 5, characterized in that: A second heat dissipation fin (13) is provided on the outer side of the cylinder body (12); the bottom of the air-guiding heat dissipation cover (2) is provided at the intersection of the cylinder body (12) and the crankcase (11); and the crankcase (11) is located inside the air-guiding heat dissipation cover (2).

7. A heat dissipation type two-stroke engine for a lawn mower according to claim 6, characterized in that: The top surface of the air-guiding heat-dissipating cover (2) is arc-shaped, and the arc of the top surface of the air-guiding heat-dissipating cover (2) on the side close to the air inlet is smaller than that on the side close to the air outlet.

8. A heat dissipation type two-stroke engine for a lawn mower according to claim 7, characterized in that: The air inlet of the air guide and heat dissipation cover (2) is oriented obliquely downward, and the air outlet is parallel to the turbofan (7).

9. A heat dissipation type two-stroke engine for a lawn mower according to claim 8, characterized in that: The cylinder body (12) is also provided with an exhaust port (123), which is located on one side of the air inlet of the air guide and heat dissipation cover (2).

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