Balancing device for hybrid mowing vehicle, generator and engine

Abstract

The utility model discloses a balancing device for a hybrid mowing vehicle, a generator and an engine, which relates to the technical field of general machinery, a crankshaft (2) of the engine is connected with a motor shaft (5) of the generator, and the balancing device comprises a flywheel (1) mounted on the crankshaft (2) and a rotor (3) assembly connected to the motor shaft (5), a connecting hole is formed in the end, close to the crankshaft (2), of the motor shaft (5), the motor shaft (5) and the connecting hole are concentric, the connecting end of the crankshaft (2) is connected into the connecting hole, and the crankshaft (2) is in rigid connection with the motor shaft (5). According to the balancing device for the generator and the engine of the hybrid mowing vehicle, the engine flywheel (1) and the generator rotor (3) are matched with each other to fully balance the rotational inertia on the engine crankshaft (2), and the axial occupied space of the motor shaft (5) can be reduced, so that the structure is more compact.

Description

Technical Field

[0001] This utility model relates to the field of general mechanical technology, and in particular to a hybrid lawnmower, a generator and an engine balancing device. Background Technology

[0002] General-purpose machinery, also known as universal machinery, refers to mechanical equipment widely used in various fields such as industrial production, agriculture, and construction. These devices typically possess multiple functions to meet the production needs of different sectors. Among them, the hybrid lawnmower is a type of general-purpose lawnmower that combines a gasoline engine and an electric drive system, designed to improve mowing efficiency, reduce energy consumption, and minimize environmental impact.

[0003] Currently, the general machinery industry uses a single flywheel design, relying on the flywheel on the engine crankshaft to balance the engine's rotational inertia. However, the balancing ability of a single flywheel is limited and cannot fully balance the rotational inertia on the engine crankshaft, resulting in large fluctuations in the engine's output torque.

[0004] In conclusion, how to effectively solve problems such as balancing the rotational inertia of the engine crankshaft is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a generator and engine balancing device that fully balances the rotational inertia on the engine crankshaft by matching the engine flywheel and the generator rotor, and can reduce the axial space occupied by the motor shaft, making the structure more compact. Another purpose of this invention is to provide a hybrid lawnmower that includes the above-mentioned generator and engine balancing device, which has the same beneficial effects as the generator and engine balancing device.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] A generator-engine balancing device is applied to a hybrid lawnmower, wherein the crankshaft of the engine and the motor shaft of the generator are connected, including a flywheel mounted on the crankshaft and a rotor assembly connected to the motor shaft. The motor shaft has a connecting hole at one end near the crankshaft, the motor shaft is concentric with the connecting hole, and the connecting end of the crankshaft is connected to the connecting hole, and the crankshaft and the motor shaft are rigidly connected.

[0008] Optionally, the connecting hole is a through hole extending through the length of the motor shaft. The balancing device also includes a fastener connected to the other end of the connecting hole. The connecting end face of the crankshaft is provided with a threaded hole. The end of the fastener is threadedly connected to the threaded hole. The head of the fastener 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.

[0009] Optionally, the diameter of the fastener is smaller than the diameter of the connecting end of the crankshaft, the through hole is a stepped hole including a large diameter hole and a small diameter hole, the crankshaft is connected to the large diameter hole, and the fastener is connected to the small diameter hole.

[0010] Optionally, the large-diameter hole is a tapered hole with an outwardly flared opening, the connecting end of the crankshaft is a tapered shaft, and the connecting end of the crankshaft mates with the tapered surface of the large-diameter hole.

[0011] Optionally, an intermediate straight hole is provided between the small-diameter hole and the tapered hole, the diameter of the intermediate straight hole being equal to the small-end diameter of the tapered hole, and the end of the tapered hole being chamfered.

[0012] Optionally, 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 is embedded in the countersunk hole.

[0013] Optionally, the connecting hole is an internally threaded hole, the connecting end of the crankshaft has an external thread, and the connecting end of the crankshaft is threadedly connected to the connecting hole.

[0014] Optionally, the connecting hole is interference-fitted with the connecting end of the crankshaft.

[0015] Optionally, the connection length between the crankshaft's connecting end and the connecting hole is one-third to one-half of the motor shaft length.

[0016] This utility model provides a hybrid lawnmower, including a generator and engine balancing device, wherein the generator and engine balancing device is specifically the generator and engine balancing device described in any of the above-mentioned embodiments.

[0017] The beneficial effects of this utility model are as follows: The generator and engine balancing device provided by this utility model has a flywheel mounted on the front end of the crankshaft away from the generator. The front end face of the crankshaft has a threaded hole, and the crankshaft and flywheel are connected by a locking component. The rotor assembly is connected to the motor shaft and includes a rear dynamic balancing plate, a rotor core, and a front dynamic balancing plate. The rear end of the motor shaft has a stepped surface, and the rotor assembly abuts against the stepped surface and is locked by a stop washer and a locking nut. In the hybrid lawnmower, the connection between the engine and generator adopts a rigid connection method. The flywheel and rotor assembly act as a "double flywheel," and the mutual matching between the engine flywheel and the generator rotor fully balances the rotational inertia on the engine crankshaft, 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.

[0018] The motor shaft has a connecting hole at the end near the crankshaft. The centerline of the motor shaft and the centerline of the connecting hole are collinear, meaning the motor shaft and crankshaft are aligned. This direct connection between the motor shaft and the engine crankshaft ensures high speed and torque transmission efficiency while reducing space requirements. The crankshaft's connecting end is inserted into the connecting hole, meaning the crankshaft 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 improving overall power density, while also lowering manufacturing costs.

[0019] This utility model also provides a hybrid lawnmower, including a generator and engine balancing device, specifically any of the aforementioned generator and engine balancing devices. Since the aforementioned generator and engine balancing devices have the above-mentioned technical effects, the hybrid lawnmower with such a generator and engine balancing device should also have the corresponding technical effects. Attached Figure Description

[0020] 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.

[0021] Figure 1 A schematic diagram of the structure of the generator and engine balancing device provided in a specific embodiment of this utility model;

[0022] Figure 2 A cross-sectional view of the balancing device for the generator and engine;

[0023] Figure 3 This is a schematic diagram of a generator;

[0024] Figure 4 This is a schematic diagram of the structure of a water-cooled motor;

[0025] Figure 5 This is a schematic diagram of the air-cooling system for the radiator;

[0026] Figure 6 This is a schematic diagram of the engine's cooling system.

[0027] Figure 7 This is a schematic diagram of the pressure balancing device for the range extender.

[0028] Figure label:

[0029] 1-Flywheel; 2-Crankshaft; 3-Rotor; 4-Fastener; 5-Motor Shaft; 6-Locking Nut; 7-Stabilizing Washer; 8-Dynamic Balance Plate; 9-Oil Seal; 10-Intermediate End Cover; 11-Waterproof and Breathable Membrane; 12-Stator; 13-Motor Chamber; 14-Inlet; 15-Outlet; 16-Inlet / Outlet Divider; 17-Inlet; 18-Outlet; 19-Outer Water Jacket; 20-O-ring; 21-Inner Water Jacket; 22-Air Guide Cover; 23-Fan Motor; 24-Impeller; 25-Air Guide Pipe; 26-Radiator; 27-Speed ​​Control Resistor. Detailed Implementation

[0030] The core of this utility model is to provide a generator and engine balancing device. This generator and engine balancing device fully balances the rotational inertia on the engine crankshaft by matching the engine flywheel and the generator rotor, and can reduce the axial space occupied by the motor shaft, making the structure more compact. Another core of this utility model is to provide a hybrid lawnmower that includes the above-mentioned generator and engine balancing device, which has the same beneficial effects as the generator and engine balancing device.

[0031] 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.

[0032] In one specific implementation, please refer to Figures 1 to 7 The generator and engine balancing device provided by this utility model is applied to a hybrid lawnmower. The crankshaft 2 of the engine and the motor shaft 5 of the generator are connected. It includes a flywheel 1 installed at the connecting end of the crankshaft 2 and a rotor 3 connected to the motor shaft 5. The motor shaft 5 has a connecting hole at one end near the crankshaft 2. The motor shaft 5 is concentric with the connecting hole. The connecting end of the crankshaft 2 is connected to the connecting hole and the crankshaft 2 and the motor shaft 5 are rigidly connected.

[0033] In the above structure, the flywheel 1 is mounted on the front end of the crankshaft 2 away from the generator. The front end face of the crankshaft 2 has a threaded hole, and the crankshaft 2 and the flywheel 1 are connected by a locking device. The rotor 3 is connected to the motor shaft 5 and includes a rear dynamic balance plate 8, a rotor core, and a front dynamic balance plate 8. The rear end of the motor shaft 5 has a stepped surface, and the rotor 3 abuts against the stepped surface and is locked by a stop washer 7 and a locking nut 6. In the hybrid lawnmower, the connection between the engine and the generator is a rigid connection. The flywheel 1 and the rotor 3 act as a "double flywheel 1," and the mutual matching between the engine flywheel 1 and the generator rotor 3 fully balances the rotational inertia on the engine crankshaft 2, reduces torque fluctuations in the engine, improves the anti-torsional capability between the generator and the engine, and makes the engine output torque more stable.

[0034] Furthermore, the motor shaft 5 has a connecting hole at one end near the crankshaft 2. The centerline of the motor shaft 5 and the centerline of the connecting hole are on the same straight line, meaning the motor shaft 5 and the crankshaft 2 are in a straight line. The motor shaft 5 is directly connected to the engine crankshaft 2, ensuring high speed and torque transmission efficiency while reducing space occupation. The connecting end of the crankshaft 2 is connected inside the connecting hole, meaning the crankshaft 2 and the motor shaft 5 are connected inside the motor shaft 5. This design reduces the axial space occupied by the motor shaft 5, making the structure more compact and significantly improving the overall power density, while reducing manufacturing costs.

[0035] Based on the above specific embodiments, the connecting hole is a through hole that extends through the length of the motor shaft 5. The balancing device also includes a fastener 4 connected to the other end of the connecting hole. The connecting end face of the crankshaft 2 is provided with a threaded hole. The end of the fastener 4 is threadedly connected to the threaded hole. The head of the fastener 4 abuts against the rear end face of the motor shaft 5. The rotation direction of the threaded hole is opposite to the rotation direction of the motor shaft 5.

[0036] In one specific embodiment, the connecting hole is a through hole extending from one end of the motor shaft 5 to the other, providing a passage for the crankshaft 2 and the fastener 4 to pass through the motor shaft 5. The connecting end of the crankshaft 2 is connected to one end of the through hole, and the fastener 4 is connected to the other end of the connecting hole. The fastener 4 may be a bolt, screw, or other type of threaded fastener 4, used to fix the connecting end of the crankshaft 2 to the motor shaft 5. The connecting end face of the crankshaft 2 has one or more threaded holes that match the threads of the fastener 4. The end of the fastener 4 is threadedly connected to the threaded hole on the crankshaft 2, providing a secure fixation and the ability to withstand a certain amount of torque and axial force. The head of the fastener 4 abuts against the rear end face of the motor shaft 5, ensuring a tight connection and axial positioning of the motor shaft 5. The direction of rotation of the threaded hole is opposite to the direction of rotation of the motor shaft 5. When the motor shaft 5 rotates, any axial force generated by vibration or power transmission will cause the fastener 4 to press more tightly against the rear end face of the motor shaft 5, preventing the fastener 4 and the threaded hole from loosening and improving the stability and reliability of the connection.

[0037] In the above embodiments, the motor shaft 5 is a hollow shaft, and the engine crankshaft 2 and the motor shaft 5 are rigidly connected by fasteners 4. Together with the flywheel 1 at the front end of the crankshaft 2, the engine crankshaft 2 has a high torsional resistance. By setting a connecting part inside the motor shaft 5, the axial space occupied by the motor shaft 5 can be reduced, making the whole device more compact. The connection method is simple, eliminating the spline and the bearing at the motor connection end, reducing the number of parts and manufacturing complexity, and reducing costs.

[0038] Based on the above specific embodiments, the diameter of the fastener 4 is smaller than the diameter of the connecting end of the crankshaft 2, and the through hole is a stepped hole including a large diameter hole and a small diameter hole. The crankshaft 2 is connected to the large diameter hole, and the fastener 4 is connected to the small diameter hole.

[0039] In one specific embodiment, the diameter of the fastener 4 is smaller than the diameter of the connecting end of the crankshaft 2, which can ensure that the fastener 4 will not put excessive pressure on the connecting end of the crankshaft 2, and also facilitate the installation and removal of the fastener 4.

[0040] The through-hole is a stepped hole, including a large-diameter hole and a small-diameter hole. The large-diameter hole is used for connecting the crankshaft 2, while the small-diameter hole is used for connecting the fastener 4. The end of the fastener 4 is threadedly connected to the threaded hole on the end face of the crankshaft 2. This not only connects the crankshaft 2 and the motor shaft 5 with the fastener 4, but also provides better structural stability and strength. The small-diameter hole has a clearance fit with the fastener 4, ensuring the stability and safety of the fastener 4, while also meeting the requirements of assembly and operation.

[0041] In the above structure, a compact and stable connection between the motor shaft 5 and the engine crankshaft 2 is achieved through stepped holes and fasteners 4, while also being convenient to manufacture and maintain.

[0042] Based on the above specific embodiments, the large-diameter hole is a tapered hole with an outward opening, the connecting end of the crankshaft 2 is a tapered shaft, and the connecting end of the crankshaft 2 is fitted with the tapered surface of the large-diameter hole.

[0043] In one specific embodiment, the connecting surfaces of the motor shaft 5 and the crankshaft 2 adopt a conical surface fit. The torque transmission of the conical 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 4 transmits the torque through the friction force between the conical hole and the conical shaft mating surface. At the same time, the conical surface fit can increase the contact area between the motor shaft 5 and the crankshaft 2, realize the high-strength connection between the motor shaft 5 and the crankshaft 2, and, together with the fastener 4 connecting the motor shaft 5 and the crankshaft 2 and the flywheel 1, has a high torsional resistance. The bearing structure is eliminated at the motor connection end, making the structure simple.

[0044] 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.

[0045] Based on the above specific embodiments, the end of the tapered hole is provided with a chamfer. The chamfer can provide a smooth transition area, which facilitates the alignment and insertion of the crankshaft 2 during assembly and reduces friction and damage during the assembly process.

[0046] Based on the above specific embodiments, the rear end face of the motor shaft 5 is provided with a countersunk hole that connects to the small-diameter hole, and the bolt head of the fastener 4 is built into the countersunk hole. The countersunk hole allows the fastener 4 to be flush with or lower than the rear end face of the motor shaft 5. The fastener 4 is installed inside the motor shaft 5, reducing the protrusion of the fastener 4 on its appearance, which is not only aesthetically pleasing but also improves the compactness of the assembly position.

[0047] Based on the above specific embodiments, the connecting hole is an internal threaded hole, the connecting end of the crankshaft 2 has an external thread, the connecting end of the crankshaft 2 is threadedly connected to the connecting hole, and the fastener 4 is connected to the threaded hole of the crankshaft 2 to connect the crankshaft 2 and the motor shaft 5, realizing the dual connection of the crankshaft 2 and the motor shaft 5, strengthening the connection strength between the motor shaft 5 and the crankshaft 2, and having a high torsional resistance.

[0048] Based on the above specific embodiments, the connection hole and the connection end of the crankshaft 2 are interference-fitted, and there is a certain fastening force between the connection hole and the crankshaft 2, which can ensure the stability and load-bearing capacity of the connection. The crankshaft 2 and the motor shaft 5 are connected by the threaded connection between the connection end of the crankshaft 2 and the connection hole, as well as the threaded connection between the fastener 4 and the crankshaft 2, achieving multiple connections between the crankshaft 2 and the motor shaft 5, strengthening the connection strength between the motor shaft 5 and the crankshaft 2, and providing high torsional resistance.

[0049] Based on the above specific embodiments, the connection length between the crankshaft 2's connecting end and the connecting hole accounts for one-third to one-half of the length of the motor shaft 5. A longer connection length between the crankshaft 2's connecting end and the connecting hole provides a larger contact area, thereby transmitting torque more effectively and ensuring higher power transmission efficiency between the motor and crankshaft 2. A longer interference fit connection length provides more contact points, increasing the reliability of the fit and improving the overall stability of the connection. 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.

[0050] Based on the generator and engine balancing device provided in the above embodiments, this utility model also provides a hybrid lawnmower, which includes a generator and engine balancing device, wherein the generator and engine balancing device is any one of the generator and engine balancing devices in the above embodiments. Since this hybrid lawnmower uses the generator and engine balancing device 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] Based on the above specific embodiments, the flow control device includes:

[0055] The first temperature sensor used to detect the generator temperature;

[0056] A second temperature sensor is used to detect the temperature of the controller;

[0057] 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.

[0058] 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.

[0059] 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:

[0060] 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.

[0061] 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.

[0062] Based on the above specific embodiments, the distance adjustment device includes:

[0063] 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.

[0064] In a preferred embodiment, the moving drive mechanism includes:

[0065] Power components used to provide power;

[0066] A transmission component connected to the power unit to enable the movement of the radiator 26.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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 2, decoupling its rotational speed 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.

[0074] Based on the above specific embodiments, the temperature control mechanism includes:

[0075] Temperature sensor used to detect engine operating temperature;

[0076] 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.

[0077] 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:

[0078] 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.

[0079] Based on the above specific embodiments, the branch control module includes:

[0080] Relays used to control the connection of low-speed and high-speed branches;

[0081] 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.

[0082] 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:

[0083] 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.

[0084] A resistor drive assembly connected to a sliding resistor and used to drive the sliding resistor to adjust to the effective resistance position.

[0085] 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.

[0086] 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 1 is connected to the engine crankshaft 2. A gap exists between the end face of the impeller 24 and the end face of the flywheel 1 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 1, resulting in damage.

[0087] Based on the above specific embodiments, the rotating shaft of the fan motor 23 is concentric with the crankshaft 2 of the engine, and the end face of the impeller 24 is parallel to the end face of the flywheel 1, which reduces space occupation and ensures that the rotating parts of the fan motor 23 and the crankshaft 2 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.

[0088] 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 1 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 24 and the flywheel 1 according to changes in engine temperature, thereby maintaining optimal engine performance and extending its service life.

[0089] 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:

[0090] A clearance control unit, connected to a temperature sensor, adjusts the impeller 24 and flywheel 1 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 1 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.

[0091] In one specific embodiment, the water-cooled motor of the hybrid lawnmower includes an inner water jacket 21 and an outer water jacket 19 that are fitted together, forming a sealed cavity between the inner water jacket 21 and the outer water jacket 19. The outer water jacket 19 is connected to an inlet 14 and an outlet 15 that communicate with the cavity. The outer water jacket 19 is provided with an inlet 17 and an outlet 18 corresponding to the inlet 14 and the outlet 15. It also includes an inlet / outlet water divider 16 disposed in the cavity, which separates the inlet 14 and the outlet 15 in the circumferential direction, so that after the cooling water flows into the cavity from the inlet 14, it flows circumferentially along the side away from the inlet / outlet water divider 16 and flows out from the outlet 15.

[0092] The water-cooled motor of the hybrid lawnmower provided by this utility model has a cooling water circulation system in the inner water jacket 21 and outer water jacket 19 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, which realizes 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.

[0093] Based on the above specific embodiments, the outer wall of the inner water jacket 21 has a groove, which is simple in structure and easy to process and maintain.

[0094] The inlet / outlet water separator 16 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 16 are in contact with the inner wall of the outer water jacket 19. This completely blocks the axial flow of the cavity, preventing coolant from flowing on both sides of the inlet / outlet water separator 16, ensuring unidirectional flow of the coolant and improving its guiding properties. After the coolant flows into the cavity from the inlet nozzle 14, it can only flow circumferentially along the side furthest from the inlet / outlet water separator 16 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.

[0095] Based on the above specific embodiments, the groove is an annular groove, and the inlet / outlet water separator 16 is connected within the annular groove. Preferably, the inlet / outlet water separator 16 is welded to the inner water jacket 21, and the inlet / outlet water separator 16 is connected to the outer water jacket 19 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 16 reduces complex pipes and connections, lowering manufacturing costs and maintenance difficulty.

[0096] 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 16. 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 16, 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.

[0097] Based on the above specific embodiments, the side of the inlet / outlet water separator 16 opposite to the circumferential direction is a curved edge with concave and convex portions, such as an S-shape. At the inlet nozzle 14 and outlet nozzle 15, 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 14 and outlet nozzle 15, facilitating coolant inflow and outflow, ensuring uniform distribution of coolant during flow, and optimizing coolant flow characteristics.

[0098] Based on the above specific embodiments, the inlet and outlet nozzles 15 are respectively located in the recesses on both sides of the inlet and outlet water separator 16, 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.

[0099] Based on the above specific embodiments, the two sides of the inlet and outlet water divider 16 have the same shape and are parallel. The cavity covers 360° of the circumferential water passage area, and the inlet and outlet water divider 16 is made as thin as possible. The two sides of the inlet and outlet water divider 16 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.

[0100] Based on the above specific embodiments, the inner water jacket 21 has slots on both sides of the groove, and O-rings 20 are provided in the slots to seal the two ends of the inner water jacket 21 and the outer water jacket 19. 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.

[0101] Based on the above specific embodiments, a flow rate control device is also included. This device controls the inlet flow rate at the inlet 14 according to the proportional relationship between the water temperature at the outlet 15 and the inlet flow rate at the inlet 14. The flow rate control device can dynamically adjust the flow rate at the inlet 14 based on changes in the water temperature at the outlet 15, thereby achieving precise flow rate control, maintaining the required temperature conditions, and improving system efficiency and response speed.

[0102] 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 14 according to the inverse relationship between the water temperature at the outlet 15 and the cooling water temperature entering the inlet 14. The water temperature control device can dynamically adjust the cooling water temperature at the inlet 14 to respond to changes in the water temperature at the outlet 15, thereby maintaining the required temperature conditions and improving the system's efficiency and accuracy.

[0103] In one specific embodiment, the range extender pressure balancing device of the hybrid lawnmower includes a crankcase with a rear port and a motor chamber 13 with a front port, an intermediate end cover 10 with both end faces sealed to the rear port of the crankcase and the front port of the motor chamber 13 respectively, the intermediate end cover 10 having a connecting hole connecting the crankcase and the motor chamber 13, the crankshaft 2 in the crankcase passing through the connecting hole and connected to the rotor shaft of the motor chamber 13, the connecting hole being connected to an oil seal 9 to seal the engine oil inside the crankcase; it also includes a pressure balancing device for making the air pressure in the motor chamber 13 equal to the air pressure in the crankcase.

[0104] The crankcase 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 13 is completely sealed, during operation, the volume of gas inside the motor chamber 13 changes due to temperature variations, leading to pressure changes. This creates a pressure difference between the inside and outside of the oil seal 9, potentially disrupting its working environment and causing oil leakage. Therefore, a pressure balancing device is added to the motor chamber 13 to connect it to the outside atmosphere. When the air pressure inside the motor chamber 13 is higher than atmospheric pressure, excess gas is discharged through the pressure balancing device. When the air pressure inside the motor chamber 13 is lower than atmospheric pressure, air enters the motor chamber 13 through the pressure balancing device, balancing the internal air pressure of the motor chamber 13 with the external environment, ensuring that the air pressure inside the motor chamber 13 is comparable to the crankcase pressure, thus protecting the oil seal 9.

[0105] The hybrid lawnmower range extender pressure balancing device provided by this utility model uses a single intermediate end cover 10 for the rear port of the crankcase and the front port of the motor chamber 13, 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 9 and the sealing of the generator stator 12 and rotor 3 chambers, a pressure balancing device is added to balance the air pressure inside the motor chamber 13 with the external environment, thereby avoiding oil leakage problems caused by changes in air pressure inside the motor chamber 13, and improving the performance and reliability of the range extender.

[0106] Based on the above specific embodiments, the pressure balancing device includes:

[0107] A pressure sensor used to detect the air pressure inside the motor chamber 13;

[0108] A pressure balancing mechanism connected to a pressure sensor, used to control the connection between the external atmosphere and the motor chamber 13 so that the external atmospheric pressure is equal to the air pressure inside the motor chamber 13 when the detected air pressure inside the motor chamber 13 is not equal to the atmospheric pressure.

[0109] 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 13 balanced. This achieves air pressure balance between the motor chamber 13 and the crankcase, preventing oil leakage from the engine oil seal 9 due to changes in air pressure inside the motor chamber 13, and ensuring the safe and stable operation of the range extender.

[0110] Based on the above specific embodiments, the pressure balancing mechanism includes:

[0111] A calculation unit used to calculate the difference between the external atmospheric pressure and the current air pressure inside the motor chamber 13;

[0112] 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 13 based on the difference information calculated by the calculation unit.

[0113] When the air pressure inside the motor chamber 13 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 13 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 13 and the external atmosphere to maintain the stability of the internal environment of the range extender and the normal operation of the equipment.

[0114] Based on the above specific embodiments, the rear end cover of the motor chamber 13 is provided with a through hole, and the pressure balancing unit includes a waterproof and breathable membrane 11 installed at the through hole. The waterproof and breathable membrane 11 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 13 is balanced with the atmospheric pressure in real time, and preventing the oil seal 9 from moving due to changes in air pressure.

[0115] Based on the above specific embodiments, the waterproof and breathable membrane 11 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.

[0116] The shell is stepped, with a waterproof and breathable membrane 11 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, ensuring a tight fit between the shell and the rear cover and enhancing the stability and sealing of the overall structure.

[0117] 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 13 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 13 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.

[0118] In a preferred embodiment, the bidirectional control valve and the waterproof and breathable membrane 11 can be installed in parallel at the through hole. When the air pressure inside the motor chamber 13 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 11 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.

[0119] The two-way control valve and waterproof and breathable membrane 11 combine active control and passive ventilation, providing an efficient, flexible and reliable pressure balance.

[0120] Based on the above specific embodiments, a sealing detection device is also included to detect whether the oil seal 9 has moved relative to the intermediate end cover 10. When the sealing detection device detects that the oil seal 9 has moved due to the change in air pressure inside the motor chamber 13, it can be repaired or replaced in time to ensure the sealing and reliability of the range extender.

[0121] Based on the above specific embodiments, the sealing detection device includes:

[0122] A position sensor used to detect the direction and distance of movement of oil seal 9 relative to intermediate end cap 10;

[0123] A sealing reset mechanism, connected to a position sensor, controls the pressure difference between the air pressure inside the motor chamber 13 and the crankcase based on the direction and distance of movement, thereby driving the oil seal 9 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 9 to move in the opposite direction, returning it to the correct position, thus restoring the sealing performance.

[0124] 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 9 relative to the intermediate end cover 10 in the range extender. The automatic reset function can promptly correct positional deviations of the oil seal 9, 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.

[0125] Based on the above specific embodiments, the sealing reset mechanism includes:

[0126] This is an information storage unit used to store the relationship between the distance required for the oil seal 9 to be reset and the pressure difference between the motor chamber 13 and the crankcase.

[0127] A sealing reset unit connected to an information storage unit, used to control the pressure difference between the air pressure in the motor chamber 13 and the air pressure in the crankcase according to the preset correspondence between the moving distance and the pressure difference value, so as to drive the oil seal 9 to move in the opposite direction and reset.

[0128] The automatic reset function can promptly correct the positional deviation of oil seal 9, 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.

[0129] 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 13 is not equal to the atmospheric pressure or when the oil seal 9 moves relative to the intermediate end cover 10.

[0130] 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.

[0131] 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.

[0132] The above provides a detailed description of the hybrid lawnmower, generator, and engine balancing device provided by this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are merely 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 generator-engine balancing device, applied to a hybrid lawnmower, characterized in that, The crankshaft (2) of the engine and the motor shaft (5) of the generator are connected, including a flywheel (1) mounted on the crankshaft (2) and a rotor (3) assembly connected to the motor shaft (5). The motor shaft (5) has a connecting hole at one end near the crankshaft (2). The motor shaft (5) is concentric with the connecting hole. The connecting end of the crankshaft (2) is connected to the connecting hole and the crankshaft (2) and the motor shaft (5) are rigidly connected.

2. The generator and engine balancing device according to claim 1, characterized in that, The connecting hole is a through hole that extends through the length of the motor shaft (5). The balancing device also includes a fastener (4) connected to the other end of the connecting hole. The connecting end face of the crankshaft (2) is provided with a threaded hole. The end of the fastener (4) is threadedly connected to the threaded hole. The head of the fastener (4) abuts against the rear end face of the motor shaft (5). The rotation direction of the threaded hole is opposite to the rotation direction of the motor shaft (5).

3. The generator and engine balancing device according to claim 2, characterized in that, The diameter of the fastener (4) is smaller than the diameter of the connecting end of the crankshaft (2). The through hole is a stepped hole including a large diameter hole and a small diameter hole. The crankshaft (2) is connected to the large diameter hole, and the fastener (4) is connected to the small diameter hole.

4. The generator and engine balancing device according to claim 3, characterized in that, The large-diameter hole is a tapered hole with an outward opening, and the connecting end of the crankshaft (2) is a tapered shaft. The connecting end of the crankshaft (2) is fitted with the tapered surface of the large-diameter hole.

5. The generator and engine balancing device according to claim 4, characterized in that, A central straight hole is provided between the small-diameter hole and the tapered hole. The diameter of the central straight hole is equal to the diameter of the small end of the tapered hole, and the end of the tapered hole is chamfered.

6. The generator and engine balancing device according to claim 3, characterized in that, The rear end face of the motor shaft (5) is provided with a countersunk hole that connects to the small diameter hole, and the bolt head of the fastener (4) is built into the countersunk hole.

7. The generator and engine balancing device according to any one of claims 1-6, characterized in that, The connecting hole is an internal threaded hole, and the connecting end of the crankshaft (2) has an external thread. The connecting end of the crankshaft (2) is threadedly connected to the connecting hole.

8. The generator and engine balancing device according to claim 7, characterized in that, The connecting hole is interference-fitted with the connecting end of the crankshaft (2).

9. The generator and engine balancing device according to claim 7, characterized in that, The length of the connection between the connecting end of the crankshaft (2) and the connecting hole is one-third to one-half of the length of the motor shaft (5).

10. A hybrid lawnmower, comprising a balancing device for a generator and an engine, characterized in that, The generator and engine balancing device is specifically the generator and engine balancing device as described in any one of claims 1 to 9.

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