Hybrid mowing vehicle and cooling system thereof

Abstract

The utility model discloses a hybrid mowing vehicle and a cooling system thereof, which are applied to the technical field of general machinery and comprise a fan assembly, a radiator (1) and a cooling water pump, the fan assembly is mounted in an engine box body (9) and used for cooling an engine, and the radiator (1) is communicated with cooling water ports of a generator and a controller and used for cooling the generator and the controller. A connecting hole (10) is formed in the engine box body (9); one end of the air guide pipe (2) is connected with the connecting hole (10), and the other end of the air guide pipe (2) faces the radiator (1). According to the cooling system, an independent cooling fan for cooling the radiator is omitted, the cost is lower, the structure of the radiator is simpler, and the failure rate of the radiator is reduced. The utility model further discloses the hybrid mowing vehicle comprising the cooling system, and the beneficial effects of the hybrid mowing vehicle are the same as those of the cooling system.

Description

Technical Field

[0001] This utility model relates to the field of general mechanical technology, and in particular to a hybrid lawnmower and its cooling system. Background Technology

[0002] A hybrid lawnmower is a lawnmower that combines a gasoline engine and an electric drive system, designed to improve mowing efficiency, reduce energy consumption, and minimize environmental impact. The engine is typically cooled by a fan, while the generator can be cooled by air or water. The water cooling system includes a water pump, radiator, engine fan, and cooling water pipes. The water pump provides the circulation power for the coolant; the radiator exchanges heat from the coolant with the outside environment; the engine fan provides airflow, enhancing the radiator's cooling capacity; and the cooling water pipes connect the entire cooling system to the heat source.

[0003] Radiator cooling methods mainly include active cooling and passive cooling. Active cooling uses a fan to force heat dissipation from the radiator; passive cooling relies solely on the radiator's own heat dissipation. Currently, the forced cooling method involves mounting a separate cooling fan 7 on the back of the radiator via a bracket 8. This separate cooling fan 7 forces heat dissipation from the radiator 1. Figure 1 As shown.

[0004] However, existing radiators not only require the installation of a separate cooling fan, but also the connection of the power supply line to the cooling fan, resulting in a complex structure, a high failure rate, and high cost for the radiator and cooling system.

[0005] In summary, how to effectively solve the problems of complex structure and high cost of existing radiator cooling devices is an urgent issue that needs to be addressed by those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide a cooling system that eliminates the need for a separate cooling fan for radiator cooling, resulting in lower costs, a simpler radiator structure, and a lower radiator failure rate. Another purpose of this invention is to provide a hybrid lawnmower that includes the above-mentioned cooling system, which has the same beneficial effects as the cooling system.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0008] A cooling system for a hybrid lawnmower includes a fan assembly installed in the engine compartment for cooling the engine, a radiator and a cooling water pump connected to a generator and a controller for cooling the generator and the controller, and a connection hole provided on the engine compartment; it also includes an air duct with one end connected to the connection hole and the other end facing the radiator.

[0009] Optionally, it also includes a flow control device for adjusting the opening of the air duct according to the proportional relationship between the generator temperature and / or the controller temperature and the opening of the air duct.

[0010] Optionally, the flow control device includes:

[0011] A first temperature sensor for detecting the temperature of the generator;

[0012] A second temperature sensor for detecting the temperature of the controller;

[0013] An opening adjustment mechanism installed inside the air duct, connected to the first temperature sensor and the second temperature sensor, for adjusting the cross-sectional area of ​​the air duct according to the proportional relationship between the generator temperature and / or the controller temperature and the opening of the air duct.

[0014] Optionally, it also includes a flow rate control device for adjusting the speed of the drive motor of the fan assembly according to the proportional relationship between the generator temperature and / or the controller temperature and the fan assembly speed.

[0015] Optionally, the fan assembly's motor speed has a high speed setting and a low speed setting, and the flow rate control device includes:

[0016] A speed control mechanism connected to the first temperature sensor and the second temperature sensor, used to control the motor of the fan assembly to run at a high speed when the temperature of the generator and / or the temperature of the controller is higher than a set value, and to control the motor of the fan assembly to run at a low speed when the temperature of the generator and / or the temperature of the controller is lower than the set value.

[0017] Optionally, it also includes a distance adjustment device, which is used to adjust the distance from the air outlet to the radiator according to the inverse relationship between the generator temperature and / or the controller temperature and the distance from the air outlet of the air duct to the radiator.

[0018] Optionally, the distance adjustment device includes:

[0019] A moving drive mechanism connected to the first temperature sensor and the second temperature sensor, used to drive the radiator to move according to the inverse relationship between the generator temperature and / or the controller temperature and the distance from the air outlet of the air duct to the radiator.

[0020] Optionally, the air outlet of the air duct faces the back of the radiator, and the air outlet surface of the air duct is parallel to the back of the radiator.

[0021] The connection hole faces the back of the radiator, and the air duct is a straight pipe.

[0022] Optionally, the air duct gradually expands outward from the connection end to its air outlet, and the center of the air outlet and the center of the radiator are on the same horizontal line.

[0023] This utility model provides a hybrid lawnmower, including a cooling system, which is specifically the cooling system described in any of the above-mentioned claims.

[0024] The beneficial effects of this utility model are as follows: the cooling system provided by this utility model uses a fan assembly to provide airflow for cooling the engine, ensuring that the engine operates at an appropriate temperature. The coolant flows from the radiator to the water pump, then to the controller, then to the generator, and back to the radiator, forming a complete coolant circulation cycle. In the cooling system, the coolant is injected into the bottom of the radiator from the radiator filler cap, and then flows into the water pump through the radiator outlet. The water pump pressurizes the coolant, achieving a complete circulation of the coolant in the cooling water circuit. The coolant then flows from the water pump into the water jackets of the controller and generator, achieving heat exchange between the coolant and the generator / controller. The temperature of the generator and controller decreases, while the temperature of the coolant increases. Finally, the coolant flows back to the radiator, where the radiator core exchanges heat with the air.

[0025] One end of the air duct connects to a connection hole on the engine block, while the other end faces the radiator. After the fan assembly starts, cool air from the engine is drawn into the engine shroud via a pull plate. Part of the air is guided through the internal structure of the shroud to cool the engine block and cylinder heads, while the remaining air flows through the connection hole on the engine block and through the air duct to the radiator, thus achieving forced cooling of the radiator using the airflow from the engine. It should be noted that since hybrid engines do not require a starter motor, the existing starter motor connection port on the engine block can be used as a connection hole for the air duct, resulting in a simple structure and convenient connection.

[0026] The cooling system for hybrid lawnmowers provided by this invention combines water and air cooling, offering high heat exchange efficiency and meeting the heat dissipation requirements of the generator and controller. The water-cooled system requires less coolant and has lower internal air pressure, reducing the need for an expansion tank and lowering costs. The radiator utilizes the engine's fan assembly for forced cooling, guiding cool air from the housing to the radiator through ducts, increasing airflow rate, enhancing the overall cooling capacity of the cooling system, and accelerating cooling speed. This allows the generator and controller to reach thermal equilibrium during operation, preventing overheating and extending their performance and lifespan. The radiator eliminates the need for a separate cooling fan, simplifying the structure and reducing costs. It also reduces the failure rate of the radiator failing to cool due to fan damage. The engine connection ports have high compatibility, allowing for easy connection of ducts to existing engines.

[0027] This utility model also provides a hybrid lawnmower, including a cooling system, which is specifically any of the cooling systems described above. Since the cooling systems described above have the aforementioned technical effects, the hybrid lawnmower with such a cooling system should also have the corresponding technical effects. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a radiator cooling system in the prior art;

[0030] Figure 2 This is a schematic diagram of the cooling system of a radiator provided in a specific embodiment of the present invention.

[0031] Figure 3 This is a schematic diagram showing the location of the connection hole on the engine;

[0032] Figure 4 This is a schematic diagram showing the location of the air duct and the radiator.

[0033] Figure 5 This is a schematic diagram of the engine's cooling system.

[0034] Figure 6 This is a schematic diagram of the water-cooled motor of the generator;

[0035] Figure 7 A schematic diagram of the balancing device for the generator and engine;

[0036] Figure 8 This is a schematic diagram of the pressure balancing device for the range extender.

[0037] Figure label:

[0038] 1-Radiator; 2-Air duct; 3-Impeller; 4-Fan motor; 5-Air guide cover; 6-Pull plate; 7-Cooling fan; 8-Bracket; 9-Housing; 10-Connecting hole; 11-Speed ​​control resistor; 12-Water inlet; 13-Water outlet; 14-Inlet / outlet water separator; 15-Water inlet; 16-Water outlet; 17-Outer water jacket; 18-O-ring; 19-Inner water jacket; 20-Fastener; 21-Flywheel; 22-Oil seal; 23-Waterproof and breathable membrane; 24-Rear end cover; 25-Stator; 26-Crankcase; 27-Crankshaft; 28-Intermediate end cover; 29-Motor chamber; 30-Rotor. Detailed Implementation

[0039] The core of this utility model is to provide a cooling system that eliminates the need for a separate cooling fan for radiator cooling, resulting in lower costs, a simpler radiator structure, and a lower radiator failure rate. Another objective of this utility model is to provide a hybrid lawnmower that includes the above-mentioned cooling system, which has the same beneficial effects as the cooling system.

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] Please refer to Figures 2 to 8 , Figure 2 This is a schematic diagram of the cooling system of a radiator provided in a specific embodiment of the present invention. Figure 3 This is a schematic diagram showing the location of the connection hole on the engine; Figure 4 This is a schematic diagram showing the location of the air duct and the radiator. Figure 5 This is a schematic diagram of the engine's cooling system. Figure 6 This is a schematic diagram of the water-cooled motor of the generator; Figure 7 A schematic diagram of the balancing device for the generator and engine; Figure 8 This is a schematic diagram of the pressure balancing device for the range extender.

[0042] In one specific embodiment, the cooling system of the hybrid lawnmower provided by this utility model includes a fan assembly installed in the engine housing 9 for cooling the engine, a radiator 1 connected to the cooling water inlet of the generator and controller for cooling the generator and controller, and a cooling water pump. The engine housing 9 is provided with a connection hole 10. It also includes an air duct 2 with one end connected to the connection hole 10 and the other end facing the radiator 1.

[0043] In the above structure, the cooling system applied to the hybrid lawnmower includes a fan assembly, a radiator 1, a cooling water pump, and an air duct 2. The fan assembly is installed inside the engine housing 9 and provides airflow to cool the engine, ensuring that the engine operates at an appropriate temperature. The fan assembly can be mounted on the engine crankshaft or on a separate motor shaft.

[0044] The cooling water pump and radiator 1 constitute a water-cooling system. The cooling water pump provides circulation power for the coolant to maintain the temperature of these components within a reasonable range; the radiator 1 exchanges heat from the coolant with the outside environment, cooling the generator and controller; cooling water pipes connect the entire cooling system to the heat source. Figure 3 As shown, the coolant flows from radiator 1 to the cooling water pump, then to the controller, then to the generator, and back to radiator 1, forming a complete coolant flow cycle. In the cooling system, coolant is injected into the bottom of radiator 1 through the radiator 1 filler cap, and then flows into the cooling water pump through the radiator 1 outlet. The cooling water pump pressurizes the coolant, achieving a complete circulation of the coolant in the cooling water circuit. Then, the coolant flows from the cooling water pump into the water jacket of the controller and generator, achieving heat exchange between the coolant and the generator and controller. The temperature of the generator and controller decreases, while the temperature of the coolant increases. Finally, it flows back to radiator 1, where the core of radiator 1 exchanges heat with the air.

[0045] One end of the air duct 2 is connected to the connection hole 10 on the engine housing 9, and the other end faces the radiator 1. After the fan assembly starts, the engine's cold air is drawn into the engine air duct 5 through the pull plate 6. Part of the air is guided by the internal structure of the air duct 5 to cool the engine housing 9 and the engine cylinder head, while the remaining part is guided through the connection hole 10 on the engine housing 9 and through the air duct 2 to the radiator 1, so that the radiator 1 can achieve the purpose of forced cooling using the air that cools the engine. It should be noted that since the hybrid special engine does not require a starter motor, the original starter motor connection port on the housing 9 can be used as the connection hole 10 for connecting the air duct 2, which is simple in structure and convenient in connection.

[0046] The cooling system provided by this utility model for a hybrid lawnmower combines water cooling and air cooling, achieving high heat exchange efficiency and meeting the heat dissipation requirements of the generator and controller. The water cooling system requires less coolant and has lower internal air pressure, reducing the need for an expansion tank and lowering costs. The radiator 1 utilizes the engine's fan assembly for forced cooling, guiding cool air from the housing 9 to the radiator 1 via the air duct 2, increasing airflow rate, enhancing the overall cooling capacity of the cooling system, accelerating cooling speed, and ensuring the generator and controller reach thermal equilibrium during operation. This prevents overheating of the generator and controller, extending their performance and lifespan. The radiator 1 eliminates the need for a separate cooling fan, simplifying the structure and reducing costs. It also reduces the failure rate of the radiator 1 failing to cool due to cooling fan damage. The engine connection port has high compatibility, allowing for easy connection of the air duct 2 to existing engines.

[0047] Based on the above specific embodiments, a flow control device is also included, which is used to adjust the opening of the air duct 2 according to the proportional relationship between the generator temperature and / or controller temperature and the opening of the air duct 2.

[0048] In practical applications, in the cooling system of a hybrid lawnmower, the flow control device adjusts the opening of the air duct 2 according to the temperature of the generator and controller. That is, when the temperature of the generator and controller rises, the flow control device increases the opening of the air duct 2 to increase the airflow to the radiator 1 and improve cooling efficiency; conversely, when the temperature drops, the opening of the air duct 2 is reduced to reduce the cooling intensity.

[0049] In the above embodiments, the flow control device in the hybrid lawnmower dynamically adjusts the opening of the air duct 2 and controls the flow of cold air acting on the radiator 1 through the air duct 2 according to the temperature changes of the generator and controller, so as to ensure the effective operation of the cooling system and maintain the engine, generator and controller at a suitable operating temperature.

[0050] Based on the above specific embodiments, the flow control device includes:

[0051] The first temperature sensor used to detect the generator temperature;

[0052] A second temperature sensor is used to detect the temperature of the controller;

[0053] An opening adjustment mechanism installed inside the air duct 2 and connected to the first temperature sensor and the second temperature sensor, used to adjust the cross-sectional area of ​​the air duct 2 according to the proportional relationship between the generator temperature and / or controller temperature and the opening of the air duct 2.

[0054] In practical applications, the first and second temperature sensors are used to detect the temperature of the generator and controller, respectively, and are responsible for real-time monitoring and providing temperature data, which will be used in the subsequent flow regulation process.

[0055] When the temperatures of the generator and controller change, the first and second temperature sensors detect these changes and transmit the temperature data to the control system. Based on this data, the opening adjustment mechanism adjusts the opening of the air duct 2 according to a preset relationship between the generator temperature and / or controller temperature and the opening of the air duct 2, thereby regulating the airflow to the radiator 1. This adjustment mechanism ensures that the generator and controller operate at suitable temperatures, preventing overheating and improving cooling efficiency.

[0056] The opening adjustment mechanism can be a flow control valve installed inside the air duct 2, which uses a high-precision pilot-operated method to control the flow. The flow control valve can be controlled automatically or manually. When the pressure in the air duct 2 changes, the automatic valve core will automatically open or close the valve to maintain the set flow value, while the manual valve core is used to set the required flow value based on the displayed value.

[0057] Based on the above specific embodiments, a flow rate control device is also included, which is used to adjust the speed of the drive motor of the fan assembly according to the proportional relationship between the generator temperature and / or controller temperature and the fan assembly speed.

[0058] In practical applications, the flow rate control device adjusts the speed of the fan assembly drive motor according to the temperature changes of the generator and controller. That is, when the temperature of the generator and controller rises, the flow rate control device increases the fan assembly speed to increase the airflow to radiator 1 and improve cooling efficiency; conversely, when the temperature drops, it reduces the fan assembly speed to reduce the cooling intensity.

[0059] This regulation mechanism ensures that the generator and controller operate at suitable temperatures, preventing overheating and improving cooling efficiency. Combined with wind speed and airflow regulation, it enables efficient management of the hybrid lawnmower's cooling system, ensuring the equipment's stability and reliability under various operating conditions.

[0060] Based on the above specific embodiments, the fan assembly motor speed is provided with a high speed range and a low speed range, and the flow rate control device includes:

[0061] A speed control mechanism connected to a first temperature sensor and a second temperature sensor, used to control the motor of the fan assembly to run at a high speed when the generator temperature and / or controller temperature are higher than the set value, and to control the motor of the fan assembly to run at a low speed when the generator temperature and / or controller temperature are lower than the set value.

[0062] In practical applications, the first and second temperature sensors monitor the temperatures of the generator and controller, respectively. These sensors send real-time temperature data to the speed control mechanism. The speed control mechanism receives signals from the temperature sensors and adjusts the motor speed of the fan assembly based on these signals.

[0063] The fan assembly's motor is designed with two different operating speeds: a high-speed speed and a low-speed speed. The high-speed speed is used for rapid cooling, while the low-speed speed is used to maintain normal cooling requirements.

[0064] When the generator temperature and / or controller temperature are higher than the preset high-temperature setting, the speed control mechanism will control the fan assembly motor to operate at a high speed to provide greater airflow and faster cooling. When the temperature is lower than the preset low-temperature setting, the speed control mechanism will control the fan assembly motor to operate at a low speed to reduce energy consumption and noise.

[0065] In the above embodiments, the flow rate control device can automatically respond to temperature changes and quickly adjust the fan speed to keep the generator and controller within the optimal operating temperature range, ensuring that the cooling needs of the hybrid lawnmower are met under different working conditions, and improving the efficiency and reliability of the entire system. By intelligently controlling the fan speed, energy efficiency is optimized, and unnecessary energy consumption is reduced.

[0066] Based on the above specific embodiments, a distance adjustment device is also included, which is used to adjust the distance between the air outlet and the radiator 1 according to the inverse relationship between the generator temperature and / or the controller temperature and the distance between the air outlet of the air duct 2 and the radiator 1.

[0067] In practical applications, the first and second temperature sensors monitor the temperatures of the generator and controller, respectively, providing real-time temperature data. The distance adjustment mechanism adjusts the position of the air outlet of the air duct 2 or the position of the radiator 1 based on the input signal from the temperature sensors, thereby changing the distance from the air outlet to the radiator 1.

[0068] The distance adjustment device dynamically adjusts the distance from the air outlet of the air duct 2 to the radiator 1 based on the temperatures of the generator and controller to optimize cooling efficiency. This design takes into account the inverse relationship between temperature and distance; that is, when the generator temperature and / or controller temperature is higher than a preset high-temperature setpoint, the distance adjustment mechanism will reduce the distance from the air outlet to the radiator 1 to get closer to the radiator 1 and improve cooling efficiency. When the temperature is lower than a preset low-temperature setpoint, the distance adjustment mechanism will increase the distance from the air outlet to the radiator 1 to reduce cooling intensity.

[0069] In the above embodiments, the distance adjustment device can automatically respond to temperature changes and quickly adjust the distance from the air outlet to the radiator 1 to keep the generator and controller within the optimal operating temperature range, ensuring that the cooling needs of the hybrid lawnmower are met under different working conditions, while also optimizing energy efficiency.

[0070] Based on the above specific embodiments, the distance adjustment device includes:

[0071] A moving drive mechanism connected to a first temperature sensor and a second temperature sensor, used to drive the radiator 1 to move based on the inverse relationship between the generator temperature and / or controller temperature and the distance from the air outlet of the air duct 2 to the radiator 1.

[0072] In practical applications, the components connected to the first and second temperature sensors are used to monitor the temperatures of the generator and controller, respectively. A moving drive mechanism is responsible for adjusting the distance from the air outlet of the air duct 2 to the radiator 1 based on the input signals from the temperature sensors. This mechanism can be a motor, cylinder, or other mechanical device, capable of precisely moving the air outlet position. When the generator temperature and / or the controller temperature is higher than a set value, the moving drive mechanism reduces the distance from the air outlet to the radiator 1 to enhance the cooling effect; when the temperature is lower than the set value, it increases the distance from the air outlet to the radiator 1 to reduce the cooling intensity.

[0073] The distance adjustment device intelligently adjusts the position of the air outlet of the air duct 2 to ensure that the cooling needs of the hybrid lawnmower are met under different working conditions, while also optimizing energy efficiency.

[0074] In a preferred embodiment, the moving drive mechanism includes:

[0075] Power components used to provide power;

[0076] A transmission component connected to the power unit to enable the movement of the radiator 1.

[0077] The power unit provides the necessary power to drive the movement of the radiator 1. This unit can be a motor, hydraulic cylinder, pneumatic cylinder, or other form of energy conversion device. The transmission unit is responsible for transmitting the power generated by the power unit to the radiator 1, enabling its movement. This unit can include gears, belts, chains, lead screws, etc., which convert rotary motion into linear motion or vice versa. Preferably, a guide mechanism is also included to ensure that the radiator 1 moves along a predetermined path. Common guide mechanisms include linear guides and ball screws. These guide mechanisms not only provide linearity of movement but also ensure stability and accuracy of movement.

[0078] In summary, the moving drive mechanism is powered by a power component and transmitted to the radiator 1 via a transmission component, enabling its movement. The guiding mechanism ensures the accuracy of the movement. These components work together to allow the radiator 1 to dynamically adjust its distance from the air outlet of the air duct 2 based on temperature changes from the generator and controller, thereby optimizing cooling efficiency.

[0079] Based on the above specific embodiments, the air outlet of the air duct 2 faces the back of the radiator 1, and the air outlet surface of the air duct 2 is parallel to the back of the radiator 1.

[0080] In one specific embodiment, the air outlet of the air duct 2 is oriented towards the back of the heat sink 1. The air outlet surface being parallel to the back of the heat sink 1 helps to distribute the airflow more evenly, thereby providing a consistent cooling effect across the entire surface of the heat sink 1. The airflow can flow along the surface of the heat sink 1, increasing the surface area of ​​contact between the air and the heat sink, thereby improving the heat exchange efficiency. Space can be utilized more effectively, especially in limited spaces, ensuring a compact layout of the heat sink 1 and the fan while maintaining high-efficiency heat dissipation performance.

[0081] Of course, the parallel arrangement of the air outlet surface of the air duct 2 with the back of the radiator 1 is only a preferred embodiment. Alternatively, the air outlet surface of the air duct 2 can be at a set angle to the back of the radiator 1, such as an angle of 30°, to increase the surface area of ​​contact between the air and the heat sink and further improve the heat exchange efficiency.

[0082] Based on the above specific embodiments, the connecting hole 10 faces the back of the heat sink 1, and the air duct 2 is a straight pipe.

[0083] In one specific embodiment, the connection hole 10 is formed on the engine housing 9, facing the back of the radiator 1, which is usually a place where heat is concentrated. The air duct 2 is directly connected to the engine housing 9, while ensuring that one end of the air duct 2 can face the back of the radiator 1, so that airflow can directly cool the radiator 1.

[0084] The straight-tube shape of the air duct 2 simplifies the manufacturing and installation process, while reducing airflow resistance and improving cooling efficiency. The straight-tube shape also helps to precisely control the airflow direction, ensuring that cooling air flows directly to the radiator 1.

[0085] When the air duct 2 is a bend, the bending angle should not exceed 90 degrees to reduce the wind resistance generated on the airflow passing through it and ensure the working efficiency of the radiator 1.

[0086] In summary, by placing the connection hole 10 on the engine housing 9 and facing the back of the radiator 1, and by using a straight-tube-shaped air duct 2, the cooling system can be made more compact and efficient; space occupancy can be reduced; and cooling air can be directly and evenly flow through the radiator 1, thereby improving the cooling effect.

[0087] Based on the above specific embodiments, the air duct 2 gradually expands outward from the connection end to its air outlet, and the center of the air outlet and the center of the radiator 1 are on the same horizontal line.

[0088] In one specific embodiment, the air duct 2 gradually expands outward from the connection end to the air outlet, reducing airflow turbulence and eddies, reducing airflow resistance, and improving the flow rate and uniformity of cooling air; and providing a larger area at the air outlet to cover more of the radiator 1, thereby enhancing the cooling effect.

[0089] The center of the air outlet and the center of the radiator 1 are on the same horizontal line. This alignment ensures that the air coming out of the air duct 2 can flow directly and evenly over the entire surface of the radiator 1, ensuring that the cooling air flows directly to the target area. The contact area between the cold air and the radiator 1 is large, avoiding local overheating or insufficient cooling, and improving the overall performance of the hybrid lawnmower cooling system.

[0090] Based on the cooling system provided in the above embodiments, this utility model also provides a hybrid lawnmower, which includes a cooling system, wherein the cooling system is any one of the cooling systems in the above embodiments. Since this hybrid lawnmower uses the cooling system in the above embodiments, the beneficial effects of this hybrid lawnmower can be found in the above embodiments. The structure of other parts of this hybrid lawnmower can be found in the prior art, and will not be described in detail here.

[0091] In one specific embodiment, the cooling device for a hybrid lawnmower provided by this invention includes a fan motor 4 and an impeller 3 mounted on the shaft of the fan motor 4, with the impeller 3 facing the engine to cool it. It also includes a temperature control mechanism for controlling the rotation speed of the fan motor 4 according to the engine temperature. The impeller 3 is disengaged from the engine crankshaft 27, and its rotation speed is decoupled from the engine speed, meaning the impeller 3's rotation speed does not change with the engine speed. The impeller 3's rotation speed is controlled by the fan motor 4, which drives the impeller 3 to rotate and cool the engine. The fan motor 4 can adjust the impeller 3's speed according to engine operating conditions, temperature, and other parameters through speed adjustment, meeting the cooling needs of the engine under different operating conditions. This ensures the engine operates within the target temperature range, optimizing the problem of insufficient cooling performance due to low fan speed during low-speed engine operation and addressing the problem of increased mechanical losses due to excessive cooling capacity. Furthermore, after the engine stops, the fan motor 4 can continue to drive the impeller 3 to rotate, continuing to provide air cooling to the engine, preventing temperature spikes after engine shutdown, reducing energy consumption, and improving engine performance and durability.

[0092] Based on the above specific embodiments, the temperature control mechanism includes:

[0093] Temperature sensor used to detect engine operating temperature;

[0094] A temperature control unit, connected to a temperature sensor, controls the fan motor 4 to stop or operate at a low speed when the temperature sensor detects that the current engine operating temperature is below the optimal operating temperature range; conversely, it controls the fan motor 4 to operate at a high speed when the temperature sensor detects that the current engine operating temperature is above the optimal operating temperature range. This temperature control mechanism effectively controls the engine temperature, keeping it within the optimal operating temperature range, reducing thermal stress, ensuring stable operation under various conditions, improving energy efficiency, and extending engine lifespan. Precise control of the fan motor 4's speed reduces unnecessary energy consumption and improves fuel economy.

[0095] Based on the above specific embodiments, the negative terminal of the fan motor 4 is connected to the negative terminal of the power supply, and the positive terminal of the fan motor 4 is connected to at least two branches, one of which is a high-speed branch connected to the positive terminal of the fan motor 4, and the other is a low-speed branch connected to the positive terminal of the fan motor 4. The low-speed branch is connected in parallel with the high-speed branch, and a speed regulating resistor 11 is connected to the low-speed branch. The temperature control unit includes:

[0096] This branch control module, connected to the low-speed and high-speed branches, controls the fan motor 4 to stop or activate the low-speed branch when the current operating temperature of the engine is detected to be below the optimal operating temperature range; and controls the fan motor 4 to activate the high-speed branch when the temperature sensor detects that the current operating temperature of the engine is above the optimal operating temperature range. This enables an effective temperature control mechanism to automatically adjust the speed of the fan motor 4, maintaining the engine within its optimal operating temperature range.

[0097] Based on the above specific embodiments, the branch control module includes:

[0098] Relays used to control the connection of low-speed and high-speed branches respectively;

[0099] This component, connected to a relay, controls all relays to turn off or the low-speed branch relay to turn on when the current engine operating temperature is detected to be below the optimal operating temperature range; and controls the high-speed branch relay to turn on when the current engine operating temperature is detected to be above the optimal operating temperature range. This control method allows for dynamic adjustment of the fan cooling capacity according to the cooling requirements of the engine under different operating conditions, providing convenient control.

[0100] Based on the above specific embodiments, the speed regulating resistor 11 is a sliding resistor, and the branch selection component has a preset curve corresponding to the engine operating temperature and the effective resistance of the sliding resistor. The branch selection component includes:

[0101] A resistance determination component for determining the effective resistance of the sliding resistor corresponding to the current operating temperature based on the engine's current operating temperature and curve.

[0102] A resistor drive assembly connected to a sliding resistor and used to drive the sliding resistor to adjust to the effective resistance position.

[0103] The resistance determination component is responsible for determining the effective resistance value of the sliding resistor based on the engine's current operating temperature and a preset curve. The curve can be a physical graph or a digital model stored in the microcontroller, used to guide the adjustment of the resistance value. The resistance drive component is connected to the sliding resistor and is responsible for driving the sliding resistor to adjust to the effective resistance position, thereby changing the resistance value. The speed control resistor 11 connected to the low-speed branch can be adjusted as needed. By adjusting the sliding resistor, the low-speed operating speed of the fan motor 4 can be finely adjusted to maintain the engine temperature close to the optimal operating temperature range for precise temperature control.

[0104] Based on the above specific embodiments, a wind deflector 5 is connected to the engine, a fan motor 4 is connected to the wind deflector 5, and a flywheel 21 is connected to the engine crankshaft 27. A gap exists between the end face of the impeller 3 and the end face of the flywheel 21 to prevent contact and friction during operation. This reduces wear and energy loss, and also avoids noise caused by contact. The size of the gap needs to be precisely controlled; an excessively large gap may reduce airflow efficiency, while an excessively small gap may cause contact between the impeller 3 and the flywheel 21, resulting in damage.

[0105] Based on the above specific embodiments, the rotating shaft of the fan motor 4 is concentric with the crankshaft 27 of the engine, and the end face of the impeller 3 is parallel to the end face of the flywheel 21, which reduces space occupation and ensures that the rotating parts of the fan motor 4 and the crankshaft 27 maintain a consistent dynamic balance during operation; it is convenient to maintain a uniform gap between the two, reduce wear caused by unbalanced operation or vibration, effectively manage airflow, and improve cooling efficiency.

[0106] Based on the above specific embodiments, the cooling device applied to the general-purpose engine also includes a gap control mechanism for controlling the gap between the impeller 3 and the flywheel 21 according to the engine temperature. Through the coordinated operation of the power assembly and transmission assembly, combined with the precise control of the temperature sensor and control system, and the real-time monitoring of the feedback mechanism, the gap control mechanism can automatically adjust the gap between the impeller 3 and the flywheel 21 according to changes in engine temperature, thereby maintaining optimal engine performance and extending its service life.

[0107] Based on the above specific embodiments, the fan motor 4 is connected to the connection hole 10 of the air guide shroud 5, the fan motor 4 is movably connected to the connection hole 10, and the gap control mechanism includes:

[0108] A clearance control unit, connected to a temperature sensor, adjusts the impeller 3 and flywheel 21 to a large clearance when the current engine operating temperature is detected to be below the optimal operating temperature range, and to a small clearance when the current engine operating temperature is detected to be above the optimal operating temperature range. This clearance control mechanism automatically adjusts the clearance between the impeller 3 and flywheel 21 according to engine temperature changes to maintain optimal engine performance and extend its service life. This automatic adjustment mechanism helps improve engine efficiency and reliability while reducing wear and damage caused by improper clearance.

[0109] In one specific embodiment, the water-cooled motor of the hybrid lawnmower includes an inner water jacket 19 and an outer water jacket 17 that are fitted together, forming a sealed cavity between the inner water jacket 19 and the outer water jacket 17. The outer water jacket 17 is connected to an inlet 12 and an outlet 13 that communicate with the cavity. The outer water jacket 17 is provided with an inlet 15 and an outlet 16 corresponding to the inlet 12 and the outlet 13. It also includes an inlet / outlet water divider 14 disposed in the cavity, which separates the inlet 12 and the outlet 13 in the circumferential direction, so that after the cooling water flows into the cavity from the inlet 12, it flows circumferentially along the side away from the inlet / outlet water divider 14 and flows out from the outlet 13.

[0110] The water-cooled motor of the hybrid lawnmower provided by this utility model has a cooling water circulation system in the inner water jacket 19 and outer water jacket 17 of the motor, which is combined with the motor controller base plate for water cooling. Compared with the air-cooled motor, the water-cooled motor has a higher heat dissipation efficiency, realizing efficient cooling of the motor and its controller base plate. It can control the motor temperature within a reasonable range, keep the whole machine at a suitable working environment temperature, reduce motor failures caused by high temperature, and extend service life.

[0111] Based on the above specific embodiments, the outer wall of the inner water jacket 19 has a groove, which is simple in structure and easy to process and maintain.

[0112] The inlet / outlet water separator 14 is disposed within the groove, with its two ends connected to the two ends of the groove. The top surface of the groove and the top surface of the inlet / outlet water separator 14 are in contact with the inner wall of the outer water jacket 17. This completely blocks the axial flow of the cavity, preventing coolant from flowing along both sides of the inlet / outlet water separator 14, ensuring unidirectional flow of the coolant and improving its guiding properties. After the coolant flows into the cavity from the inlet nozzle 12, it can only flow circumferentially along the side furthest from the inlet / outlet water separator 14 due to the blocking effect of the separator. This unidirectional flow design helps ensure uniform cooling of the entire motor, avoiding the uneven cooling effect that might result from bidirectional coolant flow. The coolant can exchange heat more effectively as it flows through the motor because it is forced to flow around the entire cavity, thus improving cooling efficiency and uniformity.

[0113] Based on the above specific embodiments, the groove is an annular groove, and the inlet / outlet water separator 14 is connected within the annular groove. Preferably, the inlet / outlet water separator 14 is welded to the inner water jacket 19, and the inlet / outlet water separator 14 is connected to the outer water jacket 17 through a sealing ring, which simplifies the structure of the water-cooled motor and makes processing and maintenance easier. The combined use of the annular groove and the inlet / outlet water separator 14 reduces complex pipes and connections, lowering manufacturing costs and maintenance difficulty.

[0114] Based on the above specific embodiments, the groove is a non-through groove, and the circumferential obstruction of the non-through groove forms the inlet / outlet water separator 14. The design of the non-through groove is relatively simple and easy to process. This structure not only improves cooling efficiency but also simplifies the manufacturing process and reduces costs. Through the design of the non-through groove and the inlet / outlet water separator 14, the flow efficiency and uniformity of the coolant can be improved; bidirectional flow of the coolant is prevented, ensuring that the coolant can fully contact the heat-generating parts of the generator, thereby improving the cooling effect.

[0115] Based on the above specific embodiments, the side of the inlet / outlet water separator 14 opposite to the circumferential direction is a curved edge with concave and convex portions, such as an S-shape. At the inlet nozzle 12 and outlet nozzle 13, the coolant volume is relatively large. The smooth curved edge provides a smooth guiding channel for the coolant, reducing flow resistance, preventing coolant accumulation at the inlet nozzle 12 and outlet nozzle 13, facilitating coolant inflow and outflow, ensuring uniform distribution of coolant during flow, and optimizing coolant flow characteristics.

[0116] Based on the above specific embodiments, the inlet and outlet nozzles 13 are respectively located in the recesses on both sides of the inlet and outlet water divider 14, which can optimize space utilization and make the entire cooling system more compact; it can reduce the amount of coolant stored in the recess, and the recess can be used as part of fluid dynamics optimization to reduce the formation of turbulence and eddies, thereby reducing the resistance when the coolant flows, more accurately controlling the flow direction of the coolant, ensuring that the coolant flows along a predetermined path, and improving cooling efficiency.

[0117] Based on the above specific embodiments, the two sides of the inlet and outlet water divider 14 have the same shape and are parallel. The cavity covers 360° of the circumferential water passage area, and the inlet and outlet water divider 14 is made as thin as possible. The two sides of the inlet and outlet water divider 14 have the same shape and are parallel, that is, the recesses on both sides are staggered in the axial direction, and the recesses on both sides have the same length in the circumferential direction. The cavity covers 360° of the circumferential water passage area, that is, the coolant flow path covers the entire circumferential area. The coolant can contact the heat-generating components in all directions, thereby providing a uniform cooling effect, avoiding local overheating, and ensuring uniform temperature distribution of the entire component.

[0118] Based on the above specific embodiments, the inner water jacket 19 has slots on both sides of the groove, and O-rings 18 are provided in the slots to seal the two ends of the inner water jacket 19 and the outer water jacket 17. The structure is compact, the assembly is simple, and the sealing is reliable. It can effectively prevent coolant leakage and ensure the safety and efficiency of the cooling system.

[0119] Based on the above specific embodiments, a flow rate control device is also included. This device controls the inlet flow rate at the inlet 12 according to the proportional relationship between the water temperature at the outlet 13 and the inlet flow rate at the inlet 12. The flow rate control device can dynamically adjust the flow rate at the inlet 12 based on changes in the water temperature at the outlet 13, thereby achieving precise flow rate control, maintaining the required temperature conditions, and improving the system's efficiency and response speed.

[0120] Based on the above specific embodiments, a water temperature control device is also included. This device controls the temperature of the cooling water entering the inlet 12 according to the inverse relationship between the water temperature at the outlet 13 and the cooling water temperature entering the inlet 12. The water temperature control device can dynamically adjust the cooling water temperature at the inlet 12 in response to changes in the water temperature at the outlet 13, thereby maintaining the required temperature conditions and improving the system's efficiency and accuracy.

[0121] In one specific embodiment, the range extender pressure balancing device of the hybrid lawnmower includes a crankcase 26 with a rear port and a motor chamber 29 with a front port, an intermediate end cover 28 with both end faces sealed to the rear port of the crankcase 26 and the front port of the motor chamber 29 respectively, the intermediate end cover 28 having a connecting hole connecting the crankcase 26 and the motor chamber 29, a crankshaft 27 in the crankcase 26 passing through the connecting hole and connected to the rotor shaft of the motor chamber 29, the connecting hole being connected to an oil seal 22 to seal the engine oil inside the crankcase 26; and a pressure balancing device for making the air pressure in the motor chamber 29 equal to the air pressure in the crankcase 26.

[0122] The crankcase 26 is designed with a ventilation system, and its internal air pressure is connected to the atmosphere, making it roughly equivalent to atmospheric pressure. If the motor chamber 29 is completely sealed, during operation, the gas volume inside the chamber changes due to temperature variations, leading to pressure changes. This creates a pressure difference between the inside and outside of the oil seal 22, potentially disrupting its working environment and causing oil leakage. Therefore, a pressure balancing device is added to the motor chamber 29 to connect it to the outside atmosphere. When the air pressure inside the motor chamber 29 is higher than atmospheric pressure, excess gas is discharged through the pressure balancing device. When the air pressure inside the motor chamber 29 is lower than atmospheric pressure, air enters the motor chamber 29 through the pressure balancing device, balancing the internal air pressure of the motor chamber 29 with that of the external environment. This ensures that the air pressure inside the motor chamber 29 is roughly equivalent to that of the crankcase 26, thus protecting the oil seal 22.

[0123] The hybrid lawnmower range extender pressure balancing device provided by this utility model uses a shared intermediate end cover 28 for the rear port of the crankcase 26 and the front port of the motor chamber 29, eliminating the need for the generator front cover, simplifying the structure, making connection and assembly easier, reducing the weight of the range extender, and lowering costs. At the same time, while meeting the working requirements of the engine oil seal 22 and the sealing of the generator stator 25 and rotor 30 chambers, the addition of a pressure balancing device balances the internal air pressure of the motor chamber 29 with the external environment, thereby avoiding oil leakage problems caused by changes in air pressure inside the motor chamber 29, and improving the performance and reliability of the range extender.

[0124] Based on the above specific embodiments, the pressure balancing device includes:

[0125] A pressure sensor used to detect the air pressure inside the motor chamber 29;

[0126] A pressure balancing mechanism connected to a pressure sensor, used to control the connection between the external atmosphere and the motor chamber 29 so that the external atmospheric pressure is equal to the air pressure inside the motor chamber 29 when the detected air pressure inside the motor chamber 29 is not equal to the atmospheric pressure.

[0127] The pressure balancing device detects pressure differences through a pressure sensor and controls the gas flow through a connected pressure balancing mechanism. The pressure balancing device can respond to pressure differences in a timely manner, keeping the air pressure inside and outside the enclosed space of the motor chamber 29 balanced. This achieves air pressure balance between the motor chamber 29 and the crankcase 26, preventing oil leakage from the engine oil seal 22 due to pressure changes inside the motor chamber 29, and ensuring the safe and stable operation of the range extender.

[0128] Based on the above specific embodiments, the pressure balancing mechanism includes:

[0129] A calculation unit used to calculate the difference between the external atmospheric pressure and the current air pressure inside the motor chamber 29;

[0130] A pressure balance unit connected to the calculation unit, used to control the ventilation direction and duration of the external atmosphere and the motor chamber 29 based on the difference information calculated by the calculation unit.

[0131] When the air pressure inside the motor chamber 29 is not equal to the external atmospheric pressure, the pressure balancing unit controls the flow direction and opening degree of the valve to balance the air pressure inside the motor chamber 29 with the external atmospheric pressure. Through the coordinated work of the calculation unit and the pressure balancing unit, the pressure balancing mechanism can accurately control the pressure balance between the motor chamber 29 and the external atmosphere to maintain the stability of the internal environment of the range extender and the normal operation of the equipment.

[0132] Based on the above specific embodiments, the rear end cover 24 of the motor chamber 29 is provided with a through hole, and the pressure balancing unit includes a waterproof and breathable membrane 23 installed at the through hole. The waterproof and breathable membrane 23 has membrane pores that allow gas molecules to pass through while blocking liquid molecules, thereby achieving the dual effect of pressure balancing and waterproof and breathable properties, ensuring that the air pressure of the motor chamber 29 is balanced with the atmospheric pressure in real time, and preventing the oil seal 22 from moving due to changes in air pressure.

[0133] Based on the above specific embodiments, the waterproof and breathable membrane 23 is provided with a shell on the outside. The outer wall of the shell is provided with multiple annular grooves and a sealing ring is provided in the annular grooves. The shell and the through hole are connected by the sealing ring, which ensures the sealing between the shell and the through hole and prevents liquid and large particles from passing through the gap between the shell and the through hole.

[0134] The shell is stepped, with a waterproof and breathable membrane 23 located at the large diameter section and an annular groove located at the small diameter section. The small diameter section is inserted into the through hole and the stepped surface abuts against the end face of the rear cover 24, ensuring a tight fit between the shell and the rear cover 24 and enhancing the stability and sealing of the overall structure.

[0135] Based on the above specific embodiments, the pressure balancing unit includes a bidirectional control valve installed at the through-hole, used to control the opening of the through-hole when the detected air pressure inside the motor chamber 29 is not equal to the atmospheric pressure. The bidirectional control valve can allow gas molecules to pass through while isolating liquid molecules. This control valve can automatically open or close when the pressure difference exceeds a preset range, thereby adjusting the pressure balance between the motor chamber 29 and the external atmospheric pressure. It can also quickly respond to pressure changes and close the control valve after pressure balance is achieved to maintain the chamber's sealing.

[0136] In a preferred embodiment, the bidirectional control valve and the waterproof and breathable membrane 23 can be installed in parallel at the through hole. When the air pressure inside the motor chamber 29 is not equal to the external atmospheric pressure and needs to be adjusted quickly, the bidirectional control valve will automatically open or close according to the signal from the pressure sensor to control the inflow or outflow of gas. The bidirectional control valve provides a rapid response capability and can quickly balance the pressure in extreme cases. At the same time, the waterproof and breathable membrane 23 provides continuous ventilation, allowing gas molecules to pass through to maintain the pressure balance in the chamber, reducing dependence on the control valve, reducing energy consumption, and achieving more precise pressure control and protection.

[0137] The two-way control valve and waterproof and breathable membrane 23 combine active control and passive ventilation, providing an efficient, flexible and reliable pressure balance.

[0138] Based on the above specific embodiments, a sealing detection device is also included to detect whether the oil seal 22 has moved relative to the intermediate end cover 28. When the sealing detection device detects that the oil seal 22 has moved due to the change in air pressure inside the motor chamber 29, it can be repaired or replaced in time to ensure the sealing and reliability of the range extender.

[0139] Based on the above specific embodiments, the sealing detection device includes:

[0140] A position sensor used to detect the direction and distance of movement of the oil seal 22 relative to the intermediate end cap 28;

[0141] A sealing reset mechanism, connected to a position sensor, controls the pressure difference between the air pressure in the motor chamber 29 and the crankcase 26 based on the direction and distance of movement, thereby driving the oil seal 22 to move in the opposite direction and reset. By changing the pressure difference, a reverse force is generated; sufficient reverse force pushes the oil seal 22 to move in the opposite direction, returning it to the correct position, thus restoring the sealing performance.

[0142] In the above embodiments, the sealing detection device integrates detection and automatic reset functions, and is mainly used to monitor and maintain the position of the oil seal 22 relative to the intermediate end cover 28 in the range extender. The automatic reset function can promptly correct positional deviations of the oil seal 22, reducing potential failures caused by poor sealing; it can reduce manual intervention, improve the automation level of the system; improve the reliability and lifespan of the range extender, and reduce maintenance costs.

[0143] Based on the above specific embodiments, the sealing reset mechanism includes:

[0144] This is an information storage unit used to store the relationship between the distance that the oil seal 22 needs to move to reset and the pressure difference between the motor chamber 29 and the crankcase 26;

[0145] A sealing reset unit connected to an information storage unit, used to control the pressure difference between the air pressure in the motor chamber 29 and the air pressure in the crankcase 26 according to a preset correspondence between the moving distance and the pressure difference value, so as to drive the oil seal 22 to move in the opposite direction and reset.

[0146] The automatic reset function can promptly correct the positional deviation of the oil seal 22, reduce potential failures caused by poor sealing, and improve the reliability and lifespan of the range extender; it also reduces manual intervention and improves the automation level of the system.

[0147] Based on the above specific embodiments, an alarm device connected to the pressure balancing device and the sealing detection device is also included. The alarm device is used to issue an alarm when the detected air pressure in the motor chamber 29 is not equal to the atmospheric pressure or when the oil seal 22 moves relative to the intermediate end cover 28.

[0148] Reminder devices can reduce equipment malfunctions caused by pressure imbalances or sealing problems, improving equipment reliability and safety. Timely reminders can prevent potentially serious problems, reducing maintenance costs and downtime.

[0149] In one specific embodiment, a generator-engine balancing device is applied to a hybrid lawnmower. The crankshaft 27 of the engine and the motor shaft of the generator are connected, including a flywheel 21 mounted on the connecting end of the crankshaft 27 and a rotor 30 connected to the motor shaft. The motor shaft has a connecting hole at one end near the crankshaft 27. The motor shaft and the connecting hole are concentric. The connecting end of the crankshaft 27 is connected to the connecting hole and the crankshaft 27 and the motor shaft are rigidly connected.

[0150] In the hybrid lawnmower, the engine and generator are connected in a rigid manner. The flywheel 21 and the rotor 30 act as a "double flywheel 21". The mutual matching between the engine flywheel 21 and the generator rotor 30 fully balances the rotational inertia on the engine crankshaft 27, reduces torque fluctuations on the engine, improves the anti-torsional ability between the generator and the engine, and makes the engine output torque more stable.

[0151] Furthermore, the motor shaft has a connecting hole at one end near the crankshaft 27, and the centerline of the motor shaft is collinear with the centerline of the connecting hole. This means the motor shaft and crankshaft 27 are aligned, directly connecting to the engine crankshaft 27. This ensures high speed and torque transmission efficiency while reducing space requirements. The connecting end of the crankshaft 27 is connected within the connecting hole, meaning the crankshaft 27 and motor shaft are connected internally within the motor shaft. This design reduces the axial space occupied by the motor shaft, making the structure more compact and significantly increasing overall power density, while also reducing manufacturing costs.

[0152] Based on the above specific embodiments, the connecting hole is a through hole that extends through the length of the motor shaft. The balancing device also includes a fastener 20 connected to the other end of the connecting hole. The connecting end face of the crankshaft 27 is provided with a threaded hole. The end of the fastener 20 is threadedly connected to the threaded hole. The head of the fastener 20 abuts against the rear end face of the motor shaft. The rotation direction of the threaded hole is opposite to the rotation direction of the motor shaft.

[0153] In the above embodiments, the motor shaft is a hollow shaft, and fasteners 20 are used to achieve a rigid connection between the engine crankshaft 27 and the motor shaft. In conjunction with the flywheel 21 at the front end of the crankshaft 27, the engine crankshaft 27 has a high torsional resistance. By setting a connecting part inside the motor shaft, the axial space occupied by the motor shaft can be reduced, making the entire device more compact. The connection method is simple, eliminating the spline and the generator connection end bearing, reducing the number of parts and manufacturing complexity, and lowering costs.

[0154] Based on the above specific embodiments, the diameter of the fastener 20 is smaller than the diameter of the connecting end of the crankshaft 27. The through hole is a stepped hole including a large-diameter hole and a small-diameter hole. The crankshaft 27 is connected to the large-diameter hole, and the fastener 20 is connected to the small-diameter hole. The end of the fastener 20 is threadedly connected to the threaded hole on the end face of the crankshaft 27. This not only connects the crankshaft 27 and the motor shaft with the fastener 20, but also provides better structural stability and strength. The small-diameter hole has a clearance fit with the fastener 20, ensuring the stability and safety of the fastener 20, while also meeting the requirements of assembly and operation.

[0155] Based on the above specific embodiments, the large-diameter hole is a tapered hole with an outwardly expanding opening, and the connecting end of the crankshaft 27 is a tapered shaft. The connecting end of the crankshaft 27 and the tapered surface of the large-diameter hole are fitted together. The torque transmission of the tapered surface connection is mainly through the static friction force generated by the joint pressure between the connecting surfaces. That is, the pre-tightening force of the fastener 20 is transmitted through the friction force between the mating surfaces of the tapered hole and the tapered shaft. The tapered surface fit can increase the contact area between the motor shaft and the crankshaft 27, realize a high-strength connection, and, in conjunction with the fastener 20 connection between the motor shaft and the crankshaft 27 and the flywheel 21, has a high torsional resistance. The bearing structure is eliminated at the generator connecting end, making the structure simple.

[0156] Based on the above specific embodiments, an intermediate straight hole is provided between the small-diameter hole and the tapered hole. The diameter of the intermediate straight hole is equal to the small end diameter of the tapered hole. The intermediate straight hole can ensure smoother tapered fit assembly and higher fit accuracy. When machining the tapered hole, a straight hole can be bored according to the small end diameter with a set allowance, which can save the machining of the tapered hole step hole, shorten the cutting time, and improve production efficiency.

[0157] The end of the tapered bore is chamfered, which provides a smooth transition area, making it easier to align and insert the crankshaft 27 during assembly and reducing friction and damage during the assembly process.

[0158] Based on the above specific embodiments, the rear end face of the motor shaft is provided with a countersunk hole that connects to the small-diameter hole, and the bolt head of the fastener 20 is built into the countersunk hole. The countersunk hole allows the fastener 20 to be flush with or lower than the rear end face of the motor shaft. The fastener 20 is installed inside the motor shaft, reducing the protrusion of the fastener 20 on the appearance, which is not only aesthetically pleasing but also improves the compactness of the assembly position.

[0159] Based on the above specific embodiments, the connecting hole is an internal threaded hole, the connecting end of the crankshaft 27 has an external thread, the connecting end of the crankshaft 27 is threadedly connected to the connecting hole, and the fastener 20 is connected to the threaded hole of the crankshaft 27 to connect the crankshaft 27 and the motor shaft, realizing the dual connection of the crankshaft 27 and the motor shaft, strengthening the connection strength between the motor shaft and the crankshaft 27, and having a high torsional resistance.

[0160] Based on the above specific embodiments, the connection hole and the connection end of the crankshaft 27 are interference-fitted, and there is a certain fastening force between the connection hole and the crankshaft 27, which can ensure the stability and load-bearing capacity of the connection. The crankshaft 27 and the motor shaft are connected by the threaded connection between the connection end of the crankshaft 27 and the connection hole, as well as the threaded connection between the fastener 20 and the crankshaft 27, achieving multiple connections between the crankshaft 27 and the motor shaft, strengthening the connection strength between the motor shaft and the crankshaft 27, and providing high torsional resistance.

[0161] Based on the above specific embodiments, the connection length between the connecting end of the crankshaft 27 and the connecting hole accounts for one-third to one-half of the motor shaft length. A longer connection length between the connecting end of the crankshaft 27 and the connecting hole provides a larger contact area, thereby transmitting torque more effectively and ensuring high power transmission efficiency between the generator and the crankshaft 27. A longer interference fit connection length provides more contact points, resulting in higher reliability and improved overall connection stability. It also provides better compensation, reducing fit problems caused by temperature changes, and increases the stiffness and strength of the connection, reducing the risk of deformation or damage caused by external forces.

[0162] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0163] The hybrid lawnmower and its cooling system provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model. Therefore, this utility model is not limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cooling system of a hybrid mower, characterized in that, The cooling system comprises a fan assembly installed in an engine box (9) for cooling the engine, a radiator (1) and a cooling water pump in communication with the cooling water outlet of the generator and the controller for cooling the generator and the controller, and a connecting hole (10) formed on the engine box (9); and a wind guide pipe (2) having one end connected to the connecting hole (10) and the other end facing the radiator (1). The outlet of the wind guide pipe (2) faces the back of the radiator (1), the outlet surface of the wind guide pipe (2) is parallel to the back of the radiator (1), the connecting hole (10) faces the back of the radiator (1), the wind guide pipe (2) is a straight pipe, the wind guide pipe (2) gradually expands outward from the connecting end to the outlet, and the center of the outlet is on the same horizontal line as the center of the radiator (1).

2. The cooling system of claim 1, wherein, The cooling system further comprises a flow control device for adjusting the opening degree of the wind guide pipe (2) according to the proportional relationship between the temperature of the generator and / or the controller and the opening degree of the wind guide pipe (2).

3. The cooling system of claim 2, wherein, The flow control device comprises: a first temperature sensor for detecting the temperature of the generator; a second temperature sensor for detecting the temperature of the controller; an opening degree adjusting mechanism installed in the wind guide pipe (2) and connected to the first temperature sensor and the second temperature sensor for adjusting the cross-sectional area of the wind guide pipe (2) according to the proportional relationship between the temperature of the generator and / or the controller and the opening degree of the wind guide pipe (2).

4. The cooling system of claim 3, wherein, The cooling system further comprises a flow rate control device for adjusting the rotation speed of the driving motor of the fan assembly according to the proportional relationship between the temperature of the generator and / or the controller and the rotation speed of the fan assembly.

5. The cooling system of claim 4, wherein, The motor rotation speed of the fan assembly has a high rotation speed gear and a low rotation speed gear, and the flow rate control device comprises: a rotation speed control mechanism connected to the first temperature sensor and the second temperature sensor for controlling the motor of the fan assembly to operate at the high rotation speed gear when the temperature of the generator and / or the controller is higher than a set value, and controlling the motor of the fan assembly to operate at the low rotation speed gear when the temperature of the generator and / or the controller is lower than the set value.

6. The cooling system of claim 3, wherein, The cooling system further comprises a distance adjusting device for adjusting the distance between the outlet of the wind guide pipe (2) and the radiator (1) according to the inverse proportional relationship between the temperature of the generator and / or the controller and the distance between the outlet of the wind guide pipe (2) and the radiator (1).

7. The cooling system of claim 6, wherein, The distance adjusting device comprises: a movement driving mechanism connected to the first temperature sensor and the second temperature sensor for driving the radiator (1) to move according to the inverse proportional relationship between the temperature of the generator and / or the controller and the distance between the outlet of the wind guide pipe (2) and the radiator (1).

8. A hybrid mower, comprising a cooling system, characterized in that, The cooling system is specifically the cooling system according to any one of claims 1 to 7.

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