Water-cooled motor of hybrid mowing vehicle

Abstract

The utility model discloses a water-cooled motor of a hybrid mowing vehicle, which relates to the technical field of general gasoline engine machinery and comprises an inner water jacket (8) and an outer water jacket (6) which are connected in a sleeved mode, a sealed cavity (9) is formed between the inner water jacket (8) and the outer water jacket (6), and the outer water jacket (6) is connected with a water inlet nozzle (1) and a water outlet nozzle (2) which are communicated with the cavity (9). The water inlet nozzle (1) and the water outlet nozzle (2) are arranged in the cavity (9), and the water inlet and outlet dividing piece (3) is arranged in the cavity (9) and divides the water inlet nozzle (1) and the water outlet nozzle (2) in the circumferential direction, so that cooling water flows into the cavity (9) from the water inlet nozzle (1), then flows in the circumferential direction along the side away from the water inlet and outlet dividing piece (3) and flows out from the water outlet nozzle (2). The heat dissipation efficiency of the water-cooled motor of the hybrid mowing vehicle is higher, efficient cooling of the motor and a controller bottom plate of the motor is achieved, and the temperature of the motor can be controlled within a reasonable range.

Description

Technical Field

[0001] This utility model relates to the field of mechanical engineering, and in particular to a water-cooled motor for a hybrid lawnmower. Background Technology

[0002] Currently, the automotive industry uses either batteries or engines as the power source for vehicles, but both methods have significant drawbacks. If a battery is used, the vehicle's range is limited by its capacity, requiring periodic charging and insufficient for extended operation. If an engine is used, it outputs energy through power generation, solving the range issue, but its operation is limited by specific conditions, often running at low efficiency, increasing carbon emissions and fuel consumption, significantly raising user costs and reducing user experience. For example, range extenders used in new energy vehicles require adding a generator to the engine for range extension. Current generators use air cooling, which is ineffective, noisy, has large torque fluctuations, and low efficiency.

[0003] In conclusion, how to effectively solve the problem of poor cooling performance of existing generators is an urgent issue that needs to be addressed by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a water-cooled motor for a hybrid lawnmower. This water-cooled motor has higher heat dissipation efficiency, achieving efficient cooling of the motor and its controller base plate, and can control the motor temperature within a reasonable range.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A water-cooled motor for a hybrid lawnmower includes an inner water jacket and an outer water jacket fitted together, forming a sealed cavity between the inner and outer water jackets. The outer water jacket is connected to an inlet and an outlet that communicate with the cavity. It also includes an inlet / outlet divider disposed within the cavity, which separates the inlet and outlet in the circumferential direction, allowing cooling water to flow into the cavity from the inlet, then flow circumferentially along the side away from the inlet / outlet divider, and finally exit from the outlet.

[0007] Optionally, the outer wall of the inner water jacket has a groove, the inlet and outlet water divider is disposed in the groove, the two ends of the inlet and outlet water divider are connected to the two ends of the groove, and the top surface of the groove and the top surface of the inlet and outlet water divider are in contact with the inner wall of the outer water jacket.

[0008] Optionally, the groove is an annular groove, and the inlet / outlet water separator is connected within the annular groove.

[0009] Optionally, the groove is a non-through groove, and the circumferential obstruction of the non-through groove forms the inlet / outlet water separator.

[0010] Optionally, the side of the inlet / outlet water separator opposite to the circumferential direction is a curved edge with a concave portion and a convex portion.

[0011] Optionally, the inlet and outlet nozzles are respectively located in the recesses on both sides of the inlet / outlet water separator.

[0012] Optionally, the two sides of the inlet and outlet water separator have the same shape and are parallel, and the cavity covers 360° of the circumferential water passage area.

[0013] Optionally, the inner water jacket has slots on both sides of the groove, and O-rings are provided in the slots to seal and connect the two ends of the inner water jacket and the outer water jacket.

[0014] Optionally, it also includes a flow rate control device, which controls the inlet flow rate at the inlet according to the proportional relationship between the water temperature at the outlet and the inlet flow rate at the inlet.

[0015] Optionally, it also includes a water temperature control device, which is used to control the temperature of the cooling water entering the water inlet based on the inverse relationship between the water temperature at the outlet and the cooling water temperature entering the inlet.

[0016] The water-cooled motor for the hybrid lawnmower provided by this utility model includes an inner water jacket and an outer water jacket, which are hollow annular structures. The inner water jacket is fitted inside the outer water jacket, and the cavity formed in the middle serves as a flow channel for the coolant, allowing for the circulation of cooling water. The inlet and outlet pipes are threadedly connected to the outer water jacket and communicate with the cavity formed by the inner and outer water jackets. The inner surface of the inner water jacket is used to tightly adhere to the stator. When the motor is operating, the heat from the stator is transferred to the inner water jacket, and then to the coolant in the cavity. The circulating flow of the coolant carries away the heat from the motor.

[0017] The cavity is equipped with an inlet / outlet water separator, which separates the inlet and outlet water nozzles circumferentially and restricts the flow direction of the coolant entering the cavity. Specifically, it prevents the coolant from moving towards the side closer to the inlet / outlet water separator, so that after the coolant flows into the cavity from the inlet water nozzle, it flows circumferentially along the side away from the inlet / outlet water separator and flows out from the outlet water nozzle. This optimizes the flow path of the coolant, ensures that the coolant flows through the entire circumference of the motor, and improves cooling efficiency.

[0018] The water-cooled motor of the hybrid lawnmower provided by this utility model features a cooling water circulation system in the inner and outer water jackets of the motor, combined with water cooling through the motor controller base plate. Compared with air-cooled motors, water-cooled motors have higher heat dissipation efficiency, achieving efficient cooling of the motor and its controller base plate. This keeps the motor temperature within a reasonable range, maintaining the entire machine at a suitable operating temperature, reducing motor malfunctions caused by high temperatures, and extending its service life. Attached Figure Description

[0019] 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.

[0020] Figure 1 A schematic diagram of the structure of the water-cooled motor of the hybrid lawnmower provided in a specific embodiment of this utility model;

[0021] Figure 2 This is a cross-sectional view of a water-cooled motor;

[0022] Figure 3 This is a schematic diagram showing the connection between the outer and inner water jackets.

[0023] Figure 4 This is a schematic diagram of the air-cooled system for the radiator;

[0024] Figure 5 This is a schematic diagram of the engine's cooling system.

[0025] Figure 6 A schematic diagram of the balancing device for the generator and engine;

[0026] Figure 7 This is a schematic diagram of the pressure balancing device for the range extender.

[0027] Figure label:

[0028] 1-Inlet nozzle; 2-Outlet nozzle; 3-Inlet / outlet water separator; 4-Inlet; 5-Outlet; 6-Outer water jacket; 7-O-ring; 8-Inner water jacket; 9-Cavity; 10-Motor shaft; 11-Fastener; 12-Crankshaft case; 13-Crankshaft; 14-Intermediate end cover; 15-Motor chamber; 16-Rotor; 17-Stator; 18-Rear end cover; 19-Waterproof and breathable membrane; 20-Oil seal; 21-Flywheel; 22-Air guide shroud; 23-Fan motor; 24-Impeller; 25-Air guide duct; 26-Radiator; 27-Speed ​​control resistor. Detailed Implementation

[0029] The core of this utility model is to provide a water-cooled motor for a hybrid lawnmower. The water-cooled motor of this hybrid lawnmower has higher heat dissipation efficiency, realizing efficient cooling of the motor and its controller base plate, and can control the motor temperature within a reasonable range.

[0030] 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.

[0031] In one specific implementation, please refer to Figures 1 to 7 The water-cooled motor of the hybrid lawnmower provided by this utility model includes an inner water jacket 8 and an outer water jacket 6 connected in a sleeve, forming a sealed cavity 9 between the inner water jacket 8 and the outer water jacket 6. The outer water jacket 6 is connected to an inlet 1 and an outlet 2 that communicate with the cavity 9. The outer water jacket 6 is provided with an inlet 4 and an outlet 5 corresponding to the inlet 1 and the outlet 2. It also includes an inlet / outlet water divider 3 disposed in the cavity 9. The inlet / outlet water divider 3 separates the inlet 1 and the outlet 2 in the circumferential direction, so that after the cooling water flows into the cavity 9 from the inlet 1, it flows circumferentially along the side away from the inlet / outlet water divider 3 and flows out from the outlet 2.

[0032] In the above structure, the water-cooled motor includes an inner water jacket 8 and an outer water jacket 6, which are hollow annular structures. The inner water jacket 8 is fitted inside the outer water jacket 6, and the cavity 9 formed by the two in the middle serves as a flow channel for the coolant, allowing for the circulation of cooling water. The inlet and outlet pipes are threadedly connected to the outer water jacket 6 and communicate with the cavity 9 formed by the inner and outer water jackets 8 and 6. The inner surface of the inner water jacket 8 is used to tightly adhere to the stator 17. When the motor is working, the heat from the stator 17 is transferred to the inner water jacket 8, and then to the coolant in the cavity 9. The circulating flow of the coolant carries away the heat from the motor.

[0033] The cavity 9 is equipped with an inlet / outlet water divider 3, which separates the inlet nozzle 1 and the outlet nozzle 2 in the circumferential direction and restricts the flow direction of the coolant entering the cavity 9. That is, it prevents the coolant from moving towards the side closer to the inlet / outlet water divider 3, so that after the coolant flows into the cavity 9 from the inlet nozzle 1, it flows circumferentially along the side away from the inlet / outlet water divider 3 and flows out from the outlet nozzle 2. This optimizes the flow path of the coolant, ensures that the coolant flows through the entire circumference of the motor, and improves the cooling efficiency.

[0034] The water-cooled motor of the hybrid lawnmower provided by this utility model has a cooling water circulation system in the inner water jacket 8 and outer water jacket 6 of the motor, which is combined with the motor controller base plate for cooling through 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.

[0035] In a preferred embodiment, the motor can adopt a flat wire winding structure with a low end winding height, a compact structure, and a high slot fill factor, resulting in a maximum motor efficiency of approximately 96%. The controller can adopt a metal-oxide-semiconductor field-effect transistor, with a maximum efficiency of up to 98%. By matching the high-efficiency ranges of the motor, controller, and engine, the engine can operate in the high-efficiency speed range of the system, and the range extender system efficiency can reach 90%.

[0036] In a preferred embodiment, the speed and torque of the motor are controlled through interaction between the vehicle controller, the generator control system, and the motor controller system. During startup, the motor acts as a starter motor, driving the engine to its ignition speed, effectively improving the starting vibration problem of traditional general-purpose engines.

[0037] Based on the above specific embodiments, the outer wall of the inner water jacket 8 has a groove, the inlet and outlet water divider 3 is disposed in the groove, the two ends of the inlet and outlet water divider 3 are connected to the two ends of the groove, and the top surface of the groove and the top surface of the inlet and outlet water divider 3 are in contact with the inner wall of the outer water jacket 6.

[0038] In one specific embodiment, the outer wall of the inner water jacket 8 is designed with a groove, which contacts the inner wall of the outer water jacket 6 and achieves a sealed connection, forming a sealed cavity 9 as a flow channel for the coolant. Due to its simple structure, it is easy to process and maintain.

[0039] The two ends of the inlet / outlet water separator 3 are connected to the two ends of the groove. Its function is to completely block the axial flow of the cavity 9, preventing coolant from flowing on both sides of the separator 3, ensuring unidirectional flow of the coolant and improving its guiding properties. After the coolant flows into the cavity 9 from the inlet nozzle 1, it can only flow circumferentially along the side furthest from the separator 3 due to the blocking effect of the separator 3. This unidirectional flow design helps ensure uniform cooling of the entire motor, avoiding the uneven cooling effect that might occur with bidirectional coolant flow. The coolant can exchange heat more effectively when flowing through the motor because it is forced to flow around the entire cavity 9, thus improving cooling efficiency and uniformity. This is particularly suitable for motors that need to operate for extended periods in high-temperature environments, as it prevents overheating and extends the motor's lifespan. The inlet / outlet water separator 3 also prevents the coolant from flowing directly from the inlet nozzle 1 to the outlet nozzle 2, ensuring that the coolant can fully contact the outer wall of the inner water jacket 8, thereby more effectively removing heat.

[0040] Based on the above specific embodiments, the groove is an annular groove, and the inlet / outlet water separator 3 is connected inside the annular groove.

[0041] In one specific embodiment, the outer wall of the inner water jacket 8 is designed as an annular groove, which provides a continuous flow channel for the coolant. The annular groove design allows the coolant to circulate within the cavity 9 between the inner water jacket 8 and the outer water jacket 6, thereby achieving effective cooling of the motor. The inlet / outlet water separator 3 is connected within the annular groove, and its main function is to separate the inlet 4 and outlet 5 circumferentially. This separation ensures that the coolant flows along a predetermined path: after flowing into the cavity 9 from the inlet 1, it flows circumferentially along the side away from the inlet / outlet water separator 3, and then flows out from the outlet 2.

[0042] The presence of the inlet / outlet water separator 3 ensures that the coolant can only flow in one direction, preventing short circuits or reverse flow of the coolant in the cavity 9. This guarantees uniform cooling of the entire motor and improves cooling efficiency. By controlling the flow direction and path of the coolant, this design helps improve the heat exchange efficiency of the coolant, ensuring that the motor maintains a suitable temperature even under high load, thereby improving the motor's performance and lifespan.

[0043] Preferably, the inlet / outlet water separator 3 is welded to the inner water jacket 8, and the inlet / outlet water separator 3 is connected to the outer water jacket 6 via 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 3 reduces complex piping and connections, lowering manufacturing costs and maintenance difficulty.

[0044] Based on the above specific embodiments, the groove is a non-through groove, and the circumferential blockage of the non-through groove forms the water inlet / outlet dividing member 3.

[0045] In one specific embodiment, the outer wall of the inner water jacket 8 is designed as a non-penetrating groove, i.e. a blind groove, which is a groove with only one end open and the other end closed, without penetrating the entire material, to create a specific fluid flow channel without needing to penetrate the entire inner water jacket 8.

[0046] The non-through groove forms an inlet / outlet water separator 3 by circumferentially blocking the flow. This circumferential sealing of the annular groove separates the inlet and outlet, ensuring the coolant flows only in a predetermined direction. The function of the inlet / outlet water separator 3 is to completely block the axial flow of the cavity 9, preventing coolant from flowing on both sides of the separator. This design ensures that after the coolant flows into the cavity 9 from the inlet nozzle 1, it only flows circumferentially along the side furthest from the inlet / outlet water separator 3, exiting from the outlet nozzle 2 after one complete cycle, thus improving cooling efficiency and uniformity.

[0047] The non-through-slot design is relatively simple and easy to manufacture. This structure not only improves cooling efficiency but also simplifies the manufacturing process and reduces costs. The design of the non-through-slot and the inlet / outlet water separator 3 improves the flow efficiency and uniformity of the coolant; it prevents bidirectional flow of the coolant, ensuring that the coolant can fully contact the heat-generating parts of the motor, thereby improving the cooling effect.

[0048] Based on the above specific embodiments, the side of the inlet / outlet water separator 3 opposite to the circumferential side is a curved edge with a concave portion and a convex portion.

[0049] In one specific embodiment, the side of the inlet / outlet water separator 3 is curved, i.e., it has a shape with concave and convex portions, such as an S-shape. At the inlet nozzle 1 and outlet nozzle 2, the coolant volume is relatively large. The smooth curved edge provides a smooth guiding channel for the coolant, reducing flow resistance and preventing coolant accumulation at the inlet nozzle 1 and outlet nozzle 2. This facilitates the inflow and outflow of coolant, ensuring uniform distribution of coolant during flow and optimizing coolant flow characteristics. Simultaneously, the curved edge provides a smooth transition, reducing pressure loss during coolant flow and thus lowering system energy consumption.

[0050] Based on the above specific embodiments, the inlet and outlet nozzles 2 are respectively located on both sides of the inlet and outlet water separator 3.

[0051] In one specific embodiment, the radius of curvature of the recess is larger than the radius of the water nozzle. The water inlet 1 and the water outlet 2 are respectively set in the recesses on both sides of the water inlet and outlet divider 3, which can optimize space utilization and make the entire cooling system more compact. It can also reduce the amount of coolant stored in the recess. The recess can be used as part of the 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.

[0052] Based on the above specific embodiments, the two sides of the inlet and outlet water separator 3 have the same shape and are parallel, and the cavity 9 covers 360° of the circumferential water passage area.

[0053] In one specific embodiment, the thinner the inlet / outlet water divider 3, the larger the water flow area of ​​the cavity 9. Therefore, the inlet / outlet water divider 3 is made as thin as possible. The two sides of the inlet / outlet water divider 3 have the same shape and are parallel, meaning the recesses on both sides are offset axially, and the recesses on both sides have overlapping lengths circumferentially. The water flow area of ​​the cavity 9 covers 360° circumferentially, meaning the coolant flow path covers the entire circumferential area. The coolant can contact the heat-generating components in all directions, thus providing a uniform cooling effect, avoiding localized overheating, and ensuring a uniform temperature distribution throughout the component; maximizing the heat exchange area, thereby improving cooling efficiency. The design of the two sides having the same and parallel shape gives the inlet / outlet water divider 3 a symmetrical structure, simplifies the manufacturing process, and also helps maintain the balance of coolant flow.

[0054] Based on the above specific embodiments, the inner water jacket 8 has grooves on both sides of the groove, and O-rings 7 are provided in the grooves to seal and connect the two ends of the inner water jacket 8 and the outer water jacket 6.

[0055] In one specific embodiment, the O-ring 7 seal is a compression seal, which will not leak when the seal undergoes initial deformation and stress. The O-ring 7 seal is a self-sealing structure; as long as initial pressure exists in the O-ring 7, an absolute leak-free seal can be achieved. The seal between the inner water jacket 8 and the outer water jacket 6 is achieved through the O-ring 7, resulting in a compact structure, simple assembly, and reliable sealing; it effectively prevents coolant leakage, ensuring the safety and efficiency of the cooling system.

[0056] Based on the above specific embodiments, a flow rate control device is also included. The flow rate control device is used to control the inlet flow rate at the inlet 1 according to the proportional relationship between the water temperature at the outlet 2 and the inlet flow rate at the inlet 1.

[0057] In practical applications, flow rate control devices include:

[0058] Temperature sensors used to detect the water temperature at the two water outlets;

[0059] A throttling mechanism connected to the aforementioned temperature sensor, used to control the inlet flow rate of inlet 1 based on the proportional relationship between the water temperature at outlet 2 and the inlet flow rate at inlet 1.

[0060] The flow rate control device includes a temperature sensor and a throttling mechanism. The temperature sensor monitors the water temperature at outlet 2 in real time. This sensor can be a thermocouple, thermistor, or digital temperature sensor, converting temperature changes into electrical signals so the controller can read and process this data. The throttling mechanism adjusts its opening based on the proportional relationship between the water temperature at outlet 2 and the inlet flow rate at inlet 1, thereby regulating the inlet flow rate at inlet 1 to increase or decrease the flow rate. If the water temperature at outlet 2 rises, indicating increased cooling demand, the throttling mechanism increases the flow rate to provide more cooling water. The throttling mechanism can be in the form of a valve, orifice plate, or regulating valve, controlling the flow rate by changing the cross-sectional area of ​​the fluid channel.

[0061] In the above embodiments, the flow rate control device can dynamically adjust the flow rate at the inlet 1 according to the water temperature change at the outlet 2, so as to achieve precise flow rate control, maintain the required temperature conditions, and improve the efficiency and response speed of the system.

[0062] Based on the above specific embodiments, a water temperature control device is also included. The water temperature control device is used to control the temperature of the cooling water entering the water inlet 1 according to the inverse relationship between the water temperature at the outlet 2 and the cooling water temperature entering the inlet 1.

[0063] In practical applications, the water temperature control device includes at least two temperature sensors: one for monitoring the water temperature at the outlet 2 and the other for monitoring the cooling water temperature at the inlet 1. It also includes a temperature control mechanism for adjusting the cooling water temperature at the inlet 1. This mechanism receives signals from the two temperature sensors and calculates the target temperature to be adjusted based on this data to control the inlet water temperature and maintain the desired cooling temperature. When the water temperature at the outlet 2 increases, according to an inverse relationship, the cooling water temperature at the inlet 1 needs to be decreased to improve the cooling effect. Conversely, when the water temperature at the outlet 2 decreases, the cooling water temperature at the inlet 1 needs to be increased to reduce the cooling effect.

[0064] In the above embodiments, the water temperature control device can dynamically adjust the cooling water temperature at the inlet 1 to respond to changes in the water temperature at the outlet 2, thereby maintaining the required temperature conditions and improving the efficiency and accuracy of the system.

[0065] Based on the water-cooled motor of the hybrid lawnmower provided in the above embodiments, this utility model also provides a hybrid lawnmower that includes a water-cooled motor, wherein the water-cooled motor is any of the water-cooled motors of the hybrid lawnmowers in the above embodiments. Since this hybrid lawnmower uses the water-cooled motor from the above embodiments, the beneficial effects of this hybrid lawnmower can be found in the above embodiments.

[0066] In one specific embodiment, the cooling system applied to the hybrid lawnmower includes a fan assembly installed in the engine compartment for cooling the engine, a radiator 26 connected to the generator and controller for cooling the generator and controller, and a cooling water pump, with a connection hole provided on the engine compartment; it also includes an air duct 25 with one end connected to the connection hole and the other end facing the radiator 26.

[0067] The cooling system combines water and air cooling, offering high heat exchange efficiency to meet the heat dissipation requirements of the generator and controller. The water cooling system uses less coolant and has lower internal air pressure, reducing the need for an expansion tank and lowering costs. The radiator 26 utilizes the engine's fan assembly for forced cooling, guiding cool air from the housing to the radiator 26 via the air duct 25. This increases airflow rate, enhances the overall cooling capacity of the cooling system, and accelerates cooling speed, allowing the generator and controller to reach thermal equilibrium during operation. This prevents overheating and extends the performance and lifespan of the generator and controller. The radiator 26 eliminates the need for a separate cooling fan, simplifying the structure and reducing costs. It also reduces the failure rate of the radiator 26 failing to cool due to fan damage. The engine connection ports have high compatibility, allowing for easy connection of the air duct 25 to existing engines.

[0068] Based on the above specific embodiments, a flow control device is also included. This flow control device adjusts the opening of the air duct 25 according to a proportional relationship between the generator temperature and / or controller temperature and the opening of the air duct 25. The flow control device in the hybrid lawnmower dynamically adjusts the opening of the air duct 25 to control the flow rate of cold air acting on the radiator 26 through the air duct 25 based on the temperature changes of the generator and controller, ensuring the effective operation of the cooling system and thus maintaining the engine, generator, and controller at suitable operating temperatures.

[0069] Based on the above specific embodiments, the flow control device includes:

[0070] The first temperature sensor used to detect the generator temperature;

[0071] A second temperature sensor is used to detect the temperature of the controller;

[0072] An opening adjustment mechanism, installed inside the air duct 25 and connected to the first and second temperature sensors, adjusts the cross-sectional area of ​​the air duct 25 according to the proportional relationship between the generator temperature and / or controller temperature and the opening of the air duct 25. This adjustment mechanism ensures that the generator and controller can operate at suitable temperatures, preventing overheating and improving cooling efficiency.

[0073] Based on the aforementioned specific embodiments, a flow rate control device is also included. This device adjusts 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. This adjustment mechanism ensures that the generator and controller operate at suitable temperatures, preventing overheating and improving cooling efficiency. The combination of wind speed and airflow regulation enables efficient management of the hybrid lawnmower's cooling system, ensuring the stability and reliability of the equipment under various operating conditions.

[0074] 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:

[0075] 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.

[0076] Based on the aforementioned specific embodiments, a distance adjustment device is also included. This device adjusts the distance between the air outlet and the radiator 26 according to an inverse relationship between the generator temperature and / or controller temperature and the distance from the air outlet of the air duct 25 to the radiator 26. Specifically, when the generator temperature and / or controller temperature is higher than a preset high-temperature setting, the distance adjustment mechanism reduces the distance between the air outlet and the radiator 26 to get closer to the radiator 26 and improve cooling efficiency. When the temperature is lower than a preset low-temperature setting, the distance adjustment mechanism increases the distance between the air outlet and the radiator 26 to reduce cooling intensity. The distance adjustment device can automatically respond to temperature changes and quickly adjust the distance between the air outlet and the radiator 26 to maintain the generator and controller within their optimal operating temperature range, ensuring that the cooling needs of the hybrid lawnmower are met under different operating conditions, while also optimizing energy efficiency.

[0077] Based on the above specific embodiments, the distance adjustment device includes:

[0078] A moving drive mechanism, connected to the first and second temperature sensors, drives the radiator 26 to move based on an inverse relationship between the generator temperature and / or controller temperature and the distance from the air outlet of the air duct 25 to the radiator 26. When the generator temperature and / or controller temperature is higher than a set value, the moving drive mechanism reduces the distance from the air outlet to the radiator 26 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 26 to reduce the cooling intensity. The distance adjustment device intelligently adjusts the position of the air outlet of the air duct 25 to ensure that the cooling needs of the hybrid lawnmower are met under different working conditions, while also optimizing energy efficiency.

[0079] In a preferred embodiment, the moving drive mechanism includes:

[0080] Power components used to provide power;

[0081] A transmission component connected to the power unit to enable the movement of the radiator 26.

[0082] The moving drive mechanism is powered by a power component and transmits that power to the radiator 26 via a transmission component, enabling its movement. A guiding mechanism ensures the accuracy of the movement. These components work together to allow the radiator 26 to dynamically adjust its distance from the air outlet of the air duct 25 based on temperature changes from the generator and controller, thereby optimizing cooling efficiency.

[0083] Based on the above specific embodiments, the air outlet of the air duct 25 faces the back of the heat sink 26, and the air outlet surface of the air duct 25 is parallel to the back of the heat sink 26. Orienting the air outlet of the air duct 25 towards the back of the heat sink 26 and paralleling the air outlet surface with the back of the heat sink 26 can help distribute the airflow more evenly, thereby providing a consistent cooling effect across the entire surface of the heat sink 26. The airflow can flow along the surface of the heat sink 26, 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 26 and the fan while maintaining high-efficiency heat dissipation performance.

[0084] Based on the above specific embodiments, the connection hole is opened on the engine compartment, facing the back of the radiator 26, which is usually a place where heat is concentrated. The air duct 25 is directly connected to the engine compartment, while ensuring that one end of the air duct 25 can face the back of the radiator 26, so that airflow can directly cool the radiator 26.

[0085] The straight shape of the air duct 25 simplifies the manufacturing and installation process, reduces airflow resistance, and improves cooling efficiency. The straight shape also helps to precisely control airflow direction, ensuring that cooling air flows directly to the radiator 26. When the air duct 25 is bent, the bending angle is no greater than 90 degrees to reduce wind resistance and ensure the efficient operation of the radiator 26.

[0086] Based on the above specific embodiments, the air duct 25 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 provides a larger area at the air outlet to cover more of the radiator 26, thereby enhancing the cooling effect.

[0087] The center of the air outlet and the center of the radiator 26 are on the same horizontal line. This alignment ensures that the air coming out of the air duct 25 can flow directly and evenly over the entire surface of the radiator 26, ensuring that the cooling air flows directly to the target area. The contact area between the cold air and the radiator 26 is large, avoiding local overheating or insufficient cooling, and improving the overall performance of the hybrid lawnmower cooling system.

[0088] In one specific embodiment, the cooling device for a hybrid lawnmower provided by this invention includes a fan motor 23 and an impeller 24 mounted on the shaft of the fan motor 23, with the impeller 24 facing the engine to cool it. It also includes a temperature control mechanism for controlling the rotational speed of the fan motor 23 according to the engine temperature. The impeller 24 is disengaged from the engine crankshaft 13, and its rotational speed is decoupled from the engine speed. The impeller 24's rotational speed does not change with the engine speed; instead, it is controlled by the fan motor 23, which drives the impeller 24 to rotate and cool the engine. The fan motor 23 can adjust the speed of the impeller 24 according to parameters such as engine operating conditions and temperature through gear adjustment, so as to meet the cooling needs of the engine under different operating conditions, ensure that the engine operates within the target temperature range, optimize the problem of insufficient cooling performance caused by low fan speed when the engine is running at low speed, and optimize the problem of increased mechanical loss of the engine caused by excessive cooling capacity. At the same time, after the engine is stopped, the fan motor 23 can continue to drive the impeller 24 to rotate, continue to provide air cooling for the engine, prevent the temperature from rising after the engine is stopped, reduce energy consumption, and improve engine performance and durability.

[0089] Based on the above specific embodiments, the temperature control mechanism includes:

[0090] Temperature sensor used to detect engine operating temperature;

[0091] A temperature control unit, connected to a temperature sensor, controls the fan motor 23 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; and controls the fan motor 23 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 the engine operating within its optimal operating temperature range, reducing thermal stress, ensuring stable operation under various operating conditions, improving energy efficiency, and extending engine lifespan. Precise control of the fan motor 23's speed reduces unnecessary energy consumption and improves fuel economy.

[0092] Based on the above specific embodiments, the negative terminal of the fan motor 23 is connected to the negative terminal of the power supply, and the positive terminal of the fan motor 23 is connected to at least two branches, one of which is a high-speed branch connected to the positive terminal of the fan motor 23, and the other is a low-speed branch connected to the positive terminal of the fan motor 23. The low-speed branch is connected in parallel with the high-speed branch, and a speed regulating resistor 27 is connected to the low-speed branch. The temperature control unit includes:

[0093] This branch control module, connected to the low-speed and high-speed branches, controls the fan motor 23 to stop or activate the low-speed branch when the current engine operating temperature is detected to be below the optimal operating temperature range; and controls the fan motor 23 to activate the high-speed branch when the temperature sensor detects that the current engine operating temperature is above the optimal operating temperature range. This enables an effective temperature control mechanism to automatically adjust the speed of the fan motor 23, maintaining the engine within its optimal operating temperature range.

[0094] Based on the above specific embodiments, the branch control module includes:

[0095] Relays used to control the connection of low-speed and high-speed branches;

[0096] 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.

[0097] Based on the above specific embodiments, the speed regulating resistor 27 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:

[0098] 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.

[0099] A resistor drive assembly connected to a sliding resistor and used to drive the sliding resistor to adjust to the effective resistance position.

[0100] 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 27 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 23 can be finely adjusted to maintain the engine temperature close to the optimal operating temperature range for precise temperature control.

[0101] Based on the above specific embodiments, a wind deflector 22 is connected to the engine, a fan motor 23 is connected to the wind deflector 22, and a flywheel 21 is connected to the engine crankshaft 13. A gap exists between the end face of the impeller 24 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 24 and the flywheel 21, leading to damage.

[0102] Based on the above specific embodiments, the rotating shaft of the fan motor 23 is concentric with the crankshaft 13 of the engine, and the end face of the impeller 24 is parallel to the end face of the flywheel 21, which reduces space occupation and ensures that the rotating parts of the fan motor 23 and the crankshaft 13 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.

[0103] 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 24 and the flywheel 21 according to the engine temperature. Through the coordinated operation of the power assembly and transmission assembly, combined with precise control from the temperature sensor and control system, and real-time monitoring via a feedback mechanism, the gap control mechanism can automatically adjust the gap between the impeller 24 and the flywheel 21 according to changes in engine temperature, thereby maintaining optimal engine performance and extending its service life.

[0104] Based on the above specific embodiments, the fan motor 23 is connected to the connection hole of the air guide shroud 22, the fan motor 23 is movably connected to the connection hole, and the gap control mechanism includes:

[0105] A clearance control unit, connected to a temperature sensor, adjusts the impeller 24 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 24 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.

[0106] In one specific embodiment, the range extender pressure balancing device of the hybrid lawnmower includes a crankcase 12 with a rear port and a motor chamber 15 with a front port, and an intermediate end cover 14 with both end faces sealed to the rear port of the crankcase 12 and the front port of the motor chamber 15, respectively. The intermediate end cover 14 has a connecting hole that connects the crankcase 12 and the motor chamber 15. The crankshaft 13 in the crankcase 12 passes through the connecting hole and is connected to the rotor 16 shaft of the motor chamber 15. An oil seal 20 is connected to the connecting hole to seal the engine oil inside the crankcase 12. The device also includes a pressure balancing device for making the air pressure in the motor chamber 15 equal to the air pressure in the crankcase 12.

[0107] The crankcase 12 is designed with a ventilation system, and its internal air pressure is connected to the atmosphere, making it comparable to atmospheric pressure. If the motor chamber 15 is completely sealed, during operation, the gas volume inside the motor chamber 15 changes due to temperature variations, leading to pressure changes. This creates a pressure difference between the inside and outside of the oil seal 20, potentially disrupting its working environment and causing oil leakage. Therefore, a pressure balancing device is added to the motor chamber 15 to connect it to the outside atmosphere. When the air pressure inside the motor chamber 15 is greater than atmospheric pressure, excess gas is discharged through the pressure balancing device. When the air pressure inside the motor chamber 15 is less than atmospheric pressure, air enters the motor chamber 15 through the pressure balancing device, balancing the internal air pressure of the motor chamber 15 with that of the external environment. This ensures that the air pressure inside the motor chamber 15 is comparable to that of the crankcase 12, thus protecting the oil seal 20.

[0108] The hybrid lawnmower range extender pressure balancing device provided by this utility model uses a shared intermediate end cover 14 for the rear port of the crankcase 12 and the front port of the motor chamber 15, 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 20 and the sealing of the generator stator and rotor chambers 16, the addition of a pressure balancing device balances the air pressure inside the motor chamber 15 with the external environment, thereby avoiding oil leakage problems caused by changes in air pressure inside the motor chamber 15, improving the performance and reliability of the range extender.

[0109] Based on the above specific embodiments, the pressure balancing device includes:

[0110] A pressure sensor used to detect the air pressure inside the motor chamber 15;

[0111] A pressure balancing mechanism connected to a pressure sensor, used to control the connection between the external atmosphere and the motor chamber 15 so that the external atmospheric pressure is equal to the air pressure inside the motor chamber 15 when the detected air pressure inside the motor chamber 15 is not equal to the atmospheric pressure.

[0112] 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 15 balanced. This achieves pressure balance between the motor chamber 15 and the crankcase 12, preventing oil leakage from the engine oil seal 20 due to pressure changes inside the motor chamber 15, and ensuring the safe and stable operation of the range extender.

[0113] Based on the above specific embodiments, the pressure balancing mechanism includes:

[0114] A calculation unit used to calculate the difference between the external atmospheric pressure and the current air pressure inside the motor chamber 15;

[0115] 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 15 based on the difference information calculated by the calculation unit.

[0116] When the air pressure inside the motor chamber 15 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 15 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 15 and the external atmosphere to maintain the stability of the internal environment of the range extender and the normal operation of the equipment.

[0117] Based on the above specific embodiments, the rear end cover 18 of the motor chamber 15 is provided with a through hole, and the pressure balancing unit includes a waterproof and breathable membrane 19 installed at the through hole. The waterproof and breathable membrane 19 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 15 is balanced with the atmospheric pressure in real time, and preventing the oil seal 20 from moving due to changes in air pressure.

[0118] Based on the above specific embodiments, the waterproof and breathable membrane 19 is provided with a shell on the outside, and the outer wall of the shell is provided with multiple annular grooves. 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.

[0119] The shell is stepped, with a waterproof and breathable membrane 19 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 18, ensuring a tight fit between the shell and the rear cover 18 and enhancing the stability and sealing of the overall structure.

[0120] 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 15 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 15 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.

[0121] In a preferred embodiment, the bidirectional control valve and the waterproof and breathable membrane 19 can be installed in parallel at the through hole. When the air pressure inside the motor chamber 15 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 19 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.

[0122] The two-way control valve and waterproof and breathable membrane 19 combine active control and passive ventilation, providing an efficient, flexible and reliable pressure balance.

[0123] Based on the above specific embodiments, a sealing detection device is also included to detect whether the oil seal 20 has moved relative to the intermediate end cover 14. When the sealing detection device detects that the oil seal 20 has moved due to the change in air pressure inside the motor chamber 15, it can be repaired or replaced in time to ensure the sealing and reliability of the range extender.

[0124] Based on the above specific embodiments, the sealing detection device includes:

[0125] A position sensor used to detect the direction and distance of movement of the oil seal 20 relative to the intermediate end cap 14;

[0126] A sealing reset mechanism, connected to a position sensor, controls the pressure difference between the air pressure in the motor chamber 15 and the crankcase 12 based on the direction and distance of movement, thereby driving the oil seal 20 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 20 to move in the opposite direction, returning it to the correct position, thus restoring the sealing performance.

[0127] 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 20 relative to the intermediate end cover 14 in the range extender. The automatic reset function can promptly correct positional deviations of the oil seal 20, 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.

[0128] Based on the above specific embodiments, the sealing reset mechanism includes:

[0129] This is an information storage unit used to store the relationship between the distance that the oil seal 20 needs to move to reset and the pressure difference between the motor chamber 15 and the crankcase 12;

[0130] A sealing reset unit connected to an information storage unit, used to control the pressure difference between the air pressure in the motor chamber 15 and the air pressure in the crankcase 12 according to the preset correspondence between the moving distance and the pressure difference value, so as to drive the oil seal 20 to move in the opposite direction and reset.

[0131] The automatic reset function can promptly correct the positional deviation of the oil seal 20, 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.

[0132] 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 15 is not equal to the atmospheric pressure or when the oil seal 20 moves relative to the intermediate end cover 14.

[0133] 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.

[0134] In one specific embodiment, a generator and engine balancing device is applied to a hybrid lawnmower. The crankshaft 13 of the engine and the motor shaft 10 of the generator are connected. The device includes a flywheel 21 mounted on the connecting end of the crankshaft 13 and a rotor 16 assembly connected to the motor shaft 10. The motor shaft 10 has a connecting hole at one end near the crankshaft 13. The motor shaft 10 is concentric with the connecting hole. The connecting end of the crankshaft 13 is connected to the connecting hole and the crankshaft 13 and the motor shaft 10 are rigidly connected.

[0135] In the hybrid lawnmower, the engine and generator are connected in a rigid manner. The flywheel 21 and rotor 16 assembly acts as a "double flywheel 21". The mutual matching between the engine flywheel 21 and the generator rotor 16 fully balances the rotational inertia on the engine crankshaft 13, 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.

[0136] Furthermore, the motor shaft 10 has a connecting hole at one end near the crankshaft 13. The centerline of the motor shaft 10 and the centerline of the connecting hole are on the same straight line, meaning the motor shaft 10 and the crankshaft 13 are aligned. The motor shaft 10 and the engine crankshaft 13 are directly connected, ensuring high speed and torque transmission efficiency while reducing space occupation. The connecting end of the crankshaft 13 is connected inside the connecting hole, meaning the crankshaft 13 and the motor shaft 10 are connected inside the motor shaft 10. This design reduces the axial space occupied by the motor shaft 10, making the structure more compact and significantly improving overall power density, while reducing manufacturing costs.

[0137] Based on the above specific embodiments, the connecting hole is a through hole that extends through the length of the motor shaft 10. The balancing device also includes a fastener 11 connected to the other end of the connecting hole. The connecting end face of the crankshaft 13 is provided with a threaded hole. The end of the fastener 11 is threadedly connected to the threaded hole. The head of the fastener 11 abuts against the rear end face of the motor shaft 10. The rotation direction of the threaded hole is opposite to the rotation direction of the motor shaft 10.

[0138] In the above embodiments, the motor shaft 10 is a hollow shaft, and the engine crankshaft 13 and the motor shaft 10 are rigidly connected by fasteners 11. In conjunction with the flywheel 21 at the front end of the crankshaft 13, the engine crankshaft 13 has a high torsional resistance. By setting a connecting part inside the motor shaft 10, the axial space occupied by the motor shaft 10 can be reduced, making the whole 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 reducing costs.

[0139] Based on the above specific embodiments, the diameter of the fastener 11 is smaller than the diameter of the connecting end of the crankshaft 13. The through hole is a stepped hole including a large-diameter hole and a small-diameter hole. The crankshaft 13 is connected to the large-diameter hole, and the fastener 11 is connected to the small-diameter hole. The end of the fastener 11 is threadedly connected to the threaded hole on the end face of the crankshaft 13. This not only connects the crankshaft 13 and the motor shaft 10 with the fastener 11, but also provides better structural stability and strength. The small-diameter hole has a clearance fit with the fastener 11, ensuring the stability and safety of the fastener 11, while also meeting the requirements of assembly and operation.

[0140] Based on the above specific embodiments, the large-diameter hole is a tapered hole with an outward expansion, and the connecting end of the crankshaft 13 is a tapered shaft. The connecting end of the crankshaft 13 and the tapered surface of the large-diameter hole are fitted together. The torque is transmitted mainly through the static friction generated by the pressure between the connecting surfaces. That is, the pre-tightening force of the fastener 11 is transmitted through the friction 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 10 and the crankshaft 13, achieving a high-strength connection. Combined with the fastener 11 connecting the motor shaft 10 and the crankshaft 13 and the flywheel 21, it has a high torsional resistance. The bearing structure is eliminated at the generator connecting end, making the structure simple.

[0141] 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.

[0142] The end of the tapered bore is chamfered, which provides a smooth transition area, making it easier to align and insert the crankshaft 13 during assembly and reducing friction and damage during the assembly process.

[0143] Based on the above specific embodiments, the rear end face of the motor shaft 10 is provided with a countersunk hole that connects to the small-diameter hole, and the bolt head of the fastener 11 is built into the countersunk hole. The countersunk hole allows the fastener 11 to be flush with or lower than the rear end face of the motor shaft 10. The fastener 11 is installed inside the motor shaft 10, reducing the protrusion of the fastener 11 on the appearance, which is not only aesthetically pleasing but also improves the compactness of the assembly position.

[0144] Based on the above specific embodiments, the connecting hole is an internal threaded hole, the connecting end of the crankshaft 13 has an external thread, the connecting end of the crankshaft 13 is threadedly connected to the connecting hole, and the crankshaft 13 and the motor shaft 10 are connected by fastener 11 and the threaded hole of the crankshaft 13, realizing the dual connection of the crankshaft 13 and the motor shaft 10, strengthening the connection strength between the motor shaft 10 and the crankshaft 13, and having a high torsional resistance.

[0145] Based on the above specific embodiments, the connection hole and the connection end of the crankshaft 13 are interference-fitted, and there is a certain fastening force between the connection hole and the crankshaft 13, which can ensure the stability and load-bearing capacity of the connection. The crankshaft 13 and the motor shaft 10 are connected by the threaded connection between the connection end of the crankshaft 13 and the connection hole, as well as the threaded connection between the fastener 11 and the crankshaft 13, achieving multiple connections between the crankshaft 13 and the motor shaft 10, strengthening the connection strength between the motor shaft 10 and the crankshaft 13, and providing high torsional resistance.

[0146] Based on the above specific embodiments, the connection length between the crankshaft 13 and the connecting hole accounts for one-third to one-half of the length of the motor shaft 10. A longer connection length between the crankshaft 13 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 13. 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.

[0147] 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.

[0148] The water-cooled motor of the hybrid lawnmower provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, 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 water-cooled motor of a hybrid mower, characterized in that, The application relates to a water jacket, which comprises an inner water jacket (8) and an outer water jacket (6) connected in a set, a sealed cavity (9) formed between the inner water jacket (8) and the outer water jacket (6), a water inlet nozzle (1) and a water outlet nozzle (2) connected to the cavity (9), and a water inlet and outlet separating piece (3) arranged in the cavity (9).

2. The water-cooled electric machine of the hybrid mower vehicle according to claim 1, characterized by, The outer wall of the inner water jacket (8) is provided with a groove, the water inlet and outlet separating piece (3) is arranged in the groove, the two ends of the water inlet and outlet separating piece (3) are connected to the two ends of the groove, and the top surface of the groove and the top surface of the water inlet and outlet separating piece (3) are in contact with the inner wall of the outer water jacket (6).

3. The water-cooled electric machine of the hybrid mower vehicle according to claim 2, characterized by, The groove is a ring groove, and the water inlet and outlet separating piece (3) is connected in the ring groove.

4. The water-cooled electric machine of the hybrid mower vehicle according to claim 2, characterized by, The groove is a non-through groove, and the non-through groove is blocked in the circumferential direction to form the water inlet and outlet separating piece (3).

5. The water-cooled electric machine of the hybrid mower vehicle according to claim 2, characterized by, The opposite side edges of the water inlet and outlet separating piece (3) are curved edges with concave parts and convex parts.

6. The water-cooled electric machine of the hybrid mower vehicle according to claim 5, characterized by, The water inlet nozzle (1) and the water outlet nozzle (2) are arranged in the concave parts of the two side edges of the water inlet and outlet separating piece (3).

7. The water-cooled electric machine of the hybrid mower vehicle according to claim 5, characterized by, The two side edges of the water inlet and outlet separating piece (3) are identical and parallel, and the water passing area of the cavity (9) covers 360 degrees in the circumferential direction.

8. The water-cooled electric machine of the hybrid mower vehicle according to any one of claims 2 to 7, characterized in that, The inner water jacket (8) is provided with a slot on the two sides of the groove, and an O-shaped ring (7) is arranged in the slot to seal and connect the two ends of the inner water jacket (8) and the outer water jacket (6).

9. The water-cooled electric machine of the hybrid mower vehicle according to any one of claims 1 to 7, characterized in that, The water jacket further comprises a flow rate control device, which is used for controlling the water inlet flow rate at the water inlet nozzle (1) according to the proportional relationship between the water temperature at the water outlet nozzle (2) and the water inlet flow rate at the water inlet nozzle (1).

10. The water-cooled electric machine of the hybrid mower vehicle according to any one of claims 1 to 7, characterized in that, The water jacket further comprises a water temperature control device, which is used for controlling the cooling water temperature entering the water inlet nozzle (1) according to the inverse proportional relationship between the water temperature at the water outlet nozzle (2) and the cooling water temperature entering the water inlet nozzle (1).

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