Electromagnetic clutch reversing fan for engine

Abstract

The utility model belongs to the technical field of engine heat dissipation, and discloses an electromagnetic clutch reversing fan for an engine, the electromagnetic clutch reversing fan comprises a reversing fan body, a belt pulley, a clutch mechanism and a bracket, the reversing fan body comprises a reversing mechanism and a plurality of fan blades arranged on the peripheral side of the reversing mechanism, and the reversing mechanism can adjust the angles of the fan blades. The belt pulley and the reversing mechanism are coaxially arranged, the clutch mechanism comprises an iron core and a coil which are arranged on the belt pulley, and when the coil is powered on, the iron core can generate magnetic attraction force towards the belt pulley on the reversing mechanism so that the reversing mechanism can abut against the belt pulley to rotate along with the belt pulley. The bracket penetrates through the belt pulley and extends into the reversing mechanism to support the belt pulley and the reversing mechanism, so that oil consumption is reduced when an engine is started or the temperature is low, the utilization rate of output power of the engine is improved, meanwhile, the situation that a transmission belt is prone to fatigue fracture due to instant impact is avoided, and the service life of the transmission belt is prolonged. And the reliability of the engine is further ensured.

Description

Technical Field

[0001] This application belongs to the technical field of engine cooling, specifically relating to an electromagnetic clutch commutator fan for an engine. Background Technology

[0002] Agricultural machinery such as harvesters and tractors often operate in harsh environments, making their engine radiators prone to dust blockage. Therefore, agricultural machinery engines are typically equipped with reversing fans. When the reversing fan rotates forward, it dissipates heat from the engine radiator. When the reversing fan rotates in reverse, it blows air onto the radiator, causing the dust adhering to the surface of the heat exchanger to separate from the radiator under the action of the reverse airflow. This removes the dust from the radiator surface and ensures that the engine operates within its normal temperature range.

[0003] Currently, there are three common types of commutator fans. Two of them are hydraulic commutator fans and pneumatic commutator fans. Their working principles are largely the same: controlling the pressure of a fluid (hydraulic oil or compressed air) to change the angle of the fan blades during operation, allowing the blades to switch between suction and blowing states, thus achieving both radiator cooling and backflow. Both types of commutator fans are directly driven by the engine's crankshaft pulley, and their blade rotation speed depends on the engine speed. This means the blade speed cannot be adjusted. When the engine has just started or is at a low temperature, the fan continues to rotate with the crankshaft pulley to cool the radiator, resulting in wasted work and consequently, wasted engine output power and reduced fuel consumption. The third type is the electromagnetic clutch commutator fan. It is equipped with two sets of electromagnetic clutches, namely a forward-rotating electromagnetic clutch and a reverse-rotating electromagnetic clutch. When cooling the radiator, the reverse-rotating electromagnetic clutch disengages from the fan, while the forward-rotating electromagnetic clutch engages with the fan. The forward-rotating electromagnetic clutch drives the fan to rotate forward under the action of the crankshaft pulley, thus cooling the radiator. When reversing the radiator, the forward-rotating electromagnetic clutch disengages from the fan, while the reverse-rotating electromagnetic clutch engages with the fan. The reverse-rotating electromagnetic clutch drives the fan to rotate backward under the action of the crankshaft pulley, thus reversing the radiator. However, when switching between forward and reverse rotation of the fan, the fan needs to go through a stop and a momentary high-speed reverse rotation. This causes the drive belt, which is used to connect the electromagnetic clutch and the crankshaft pulley, to be subjected to a momentary impact force, which can easily lead to fatigue and breakage of the drive belt, thereby affecting the reliability of the engine. Utility Model Content

[0004] This application provides an electromagnetic clutch commutator fan for an engine to reduce the waste of engine output power and engine fuel consumption, and improve engine reliability.

[0005] The technical solution adopted in this application is as follows:

[0006] An electromagnetic clutch commutator fan for an engine, comprising:

[0007] A commutator fan body, the commutator fan body including a commutator mechanism and a plurality of fan blades disposed around the commutator mechanism, and the commutator mechanism is capable of adjusting the angle of the fan blades;

[0008] A pulley, which is coaxially arranged with the reversing mechanism;

[0009] The clutch mechanism includes an iron core and a coil disposed on the pulley. When the coil is energized, the iron core can generate a magnetic attraction force on the reversing mechanism toward the pulley, so that the reversing mechanism abuts against the pulley and rotates with the pulley.

[0010] A bracket, which passes through the pulley and extends into the reversing mechanism to support the pulley and the reversing mechanism.

[0011] By adopting the above technical solution, when using the electromagnetic clutch reversing fan in this application, the pulley in this application is connected to the crankshaft pulley of the engine by a transmission belt, so that the pulley in this application can rotate synchronously with the crankshaft pulley under the action of the transmission belt.

[0012] When the engine is cold-started or at a low temperature after starting, the coil does not need to be energized, thus preventing the commutation mechanism from rotating with the pulley. This reduces the engine load during cold starts or when the engine temperature is low, improving the utilization efficiency of engine output power and reducing fuel consumption. When the engine temperature rises and the radiator needs cooling, the coil is energized, causing the iron core to generate a magnetic field. This magnetic force on the commutation mechanism towards the pulley causes the commutation mechanism to contact the pulley and rotate with it. This allows the commutation fan to rotate with the crankshaft pulley, thereby cooling the radiator and lowering the engine temperature. When backflushing the radiator for dust removal, the commutation mechanism adjusts the angle of the fan blades, changing them from an intake angle to a blowing angle to backflush the radiator. This utilizes the electromagnetic clutch commutation fan for backflushing and dust removal of the radiator.

[0013] As the engine temperature gradually increases, the coil needs to be energized to generate a magnetic field in the iron core and attract the commutation mechanism using magnetic attraction. Initially, a small current can be applied to the coil, and then the current can be adjusted to gradually increase and eventually stabilize. This causes the magnetic field generated by the iron core to gradually increase and stabilize, thereby increasing the magnetic attraction of the iron core to the commutation mechanism. Ultimately, the commutation mechanism gradually engages with the pulley, avoiding a sudden impact on the drive belt caused by the commutation mechanism engaging with the pulley instantly. This prevents the belt from easily fatigued and breaking, ensuring the reliability of the engine.

[0014] In addition, the electromagnetic clutch commutator fan in this application can also adjust the magnetic force applied by the iron core to the commutator mechanism by adjusting the current of the coil, so that the commutator mechanism can rotate asynchronously with the pulley, that is, there is a speed difference between the pulley and the commutator mechanism, so that the rotation speed of the commutator mechanism can be adjusted according to the engine temperature to reduce the engine's auxiliary power, thereby further reducing the engine's fuel consumption.

[0015] In summary, the electromagnetic clutch reversing fan in this application not only reduces fuel consumption during engine startup or when the engine temperature is low, but also improves the utilization rate of engine output power during engine startup or when the engine temperature is low. At the same time, it avoids the situation where the drive belt is easily fatigued and broken due to instantaneous impact, thereby ensuring the reliability of the engine.

[0016] Optionally, a magnet is provided at one end of the pulley near the reversing mechanism. The magnet can apply a magnetic attraction force to the reversing mechanism so that the reversing mechanism can abut against the pulley under the action of the magnet.

[0017] By adopting the above technical solution and setting up an electromagnet, on the one hand, when the circuit connecting the coil malfunctions or the engine ECU control module malfunctions and cannot supply power to the coil, the commutation mechanism can still rotate with the pulley using the magnetic attraction of the magnet to achieve heat dissipation of the radiator, thereby ensuring the heat dissipation performance of the engine. On the other hand, the magnetic field generated by the iron core and the magnetic field generated by the electromagnet can be superimposed to generate a large magnetic attraction force on the commutation mechanism, thereby increasing the connection stability between the commutation mechanism and the pulley, and ensuring that the commutation mechanism can rotate synchronously with the pulley.

[0018] Optionally, a follower disk is provided at one end of the pulley near the reversing mechanism, and the magnet is located on the follower disk.

[0019] By adopting the above technical solution, since a follower disk is provided at the end of the pulley near the reversing mechanism, the contact area between the reversing mechanism and the pulley is increased on the one hand, thereby increasing the stability of the magnetic attraction between the reversing mechanism and the pulley. On the other hand, placing the magnet on the follower disk can reduce the distance between the magnet and the reversing mechanism, so as to ensure the magnetic attraction force that the magnet can apply to the reversing mechanism, thereby ensuring the stability of the reversing mechanism when it rotates with the pulley under the action of the magnet.

[0020] Optionally, the coil has a first energized state and a second energized state. In the first energized state, the direction of the magnetic field generated by the iron core is the same as the direction of the magnetic field generated by the magnet. In the second energized state, the direction of the magnetic field generated by the iron core is opposite to the direction of the magnetic field generated by the magnet.

[0021] By adopting the above technical solution, since the direction of the magnetic field generated by the iron core is the same as that of the magnetic field generated by the magnet in the first energized state, the magnetic field generated by the iron core and the magnetic field generated by the magnet can be superimposed to increase the magnetic attraction force applied to the commutation mechanism, thereby ensuring the stability of the magnetic attraction between the commutation mechanism and the pulley, and ensuring the synchronous rotation of the commutation mechanism and the pulley; since the direction of the magnetic field generated by the iron core is opposite to that of the magnetic field generated by the magnet in the second energized state, the magnetic field generated by the iron core and the magnetic field generated by the magnet can cancel each other out to adjust the magnetic attraction force applied to the commutation mechanism, thereby adjusting the speed difference between the commutation mechanism and the pulley or making the pulley rotate while the commutation mechanism remains stationary.

[0022] Optionally, the reversing mechanism is coaxially provided with a connecting plate, and the reversing mechanism abuts against the pulley through the connecting plate.

[0023] By adopting the above technical solution, since the reversing mechanism abuts against the pulley through the connecting plate, the damage to the reversing mechanism caused by the relative friction between the pulley and the reversing mechanism can be reduced, thereby extending the service life of the reversing mechanism.

[0024] Optionally, the connecting disc is provided with a magnetic conductor that can be attracted by a magnetic field on the side opposite to the reversing mechanism, and the connecting disc abuts against the pulley through the magnetic conductor.

[0025] By adopting the above technical solution, since the connecting plate abuts against the pulley through the magnetic conductor and the magnetic conductor can be magnetically attracted by the magnetic field, the connecting plate can be made of a material that is non-ferromagnetic and has good thermal conductivity, thereby improving the heat dissipation effect on the coil and avoiding the situation where the coil is prone to high temperature and affects the service life of the coil, thus further ensuring the reliability of the engine.

[0026] Optionally, the connecting disk is provided with heat dissipation fins on the side near the reversing mechanism, and multiple heat dissipation fins are provided at intervals along the circumference of the connecting disk.

[0027] By adopting the above technical solution, since the heat dissipation fins are provided on the side of the connecting plate near the commutation mechanism, the heat generated by the coil can be quickly conducted to the side of the connecting plate away from the pulley, thereby improving the heat dissipation efficiency and effect of the coil. Since multiple heat dissipation fins are arranged at intervals along the circumference of the connecting plate, the heat dissipation efficiency and effect of the coil are further improved. At the same time, the weight distribution of the connecting plate is more uniform, thereby improving the dynamic balance effect of the commutation mechanism.

[0028] Optionally, the connecting plate is provided with a guide seat, the guide seat has a guide hole, and the bracket has a guide shaft extending into the guide hole.

[0029] By adopting the above technical solution, when the reversing mechanism moves towards the pulley under the action of magnetic attraction, the reversing mechanism drives the connecting plate to move, and the connecting plate drives the guide seat to move, so that the guide shaft and the guide hole slide relative to each other. Thus, the guide shaft and the guide hole are used to guide the reversing mechanism, thereby increasing the motion stability of the reversing mechanism. At the same time, the cooperation between the guide shaft and the guide hole can also increase the cooperation area between the bracket and the reversing mechanism, thereby increasing the support stability of the bracket for the reversing mechanism.

[0030] Optionally, a follower disc is provided at one end of the pulley near the reversing mechanism, the follower disc is provided with a guide rib, and the guide seat extends into the guide rib.

[0031] By adopting the above technical solution, since the guide seat extends into the guide rib, the guide seat and the guide rib can be used to guide and support the reversing mechanism, thereby increasing the number of guide and support points for the reversing mechanism and further increasing the stability of the reversing mechanism.

[0032] Optionally, the connecting disk is provided with an elastic sheet, and the magnetic conductor is provided with a clearance hole for the end of the elastic sheet to extend out, so that the end of the elastic sheet can extend through the clearance hole and apply an elastic force away from the reversing mechanism to the follower disk.

[0033] By adopting the above technical solution, since the connecting plate is provided with an elastic sheet, and the end of the elastic sheet extends through the clearance hole provided in the magnetic guide, the end of the elastic sheet can contact the follower plate and apply an elastic force away from the reversing mechanism to the follower plate. Thus, when the magnetic field generated by the iron core completely cancels the magnetic field generated by the magnet, the reversing mechanism can move away from the pulley under the action of the elastic sheet, so that the magnetic guide and the follower plate are separated, thereby reducing the friction between the magnetic guide and the follower plate, reducing the wear of the magnetic guide and the follower plate, and further ensuring the reliability of the engine.

[0034] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0035] 1. The electromagnetic clutch commutator fan in this application includes a commutator fan body, a pulley, a clutch mechanism, and a bracket. The commutator fan body includes a commutator mechanism and multiple fan blades disposed around the commutator mechanism. The commutator mechanism can adjust the angle of the fan blades. The pulley and the commutator mechanism are coaxially arranged. The clutch mechanism includes an iron core disposed on the pulley and a coil. When the coil is energized, the iron core can generate a magnetic attraction force on the commutator mechanism towards the pulley, so that the commutator mechanism abuts against the pulley and rotates with the pulley. The bracket passes through the pulley and extends into the commutator mechanism to support the pulley and the commutator mechanism. As a result, the electromagnetic clutch commutator fan in this application not only reduces fuel consumption when the engine starts or at low temperatures, but also improves the utilization rate of engine output power when the engine starts or at low temperatures. At the same time, it avoids the situation where the drive belt is easily fatigued and broken due to instantaneous impact, thereby ensuring the reliability of the engine.

[0036] 2. In this application, a magnet is provided at the end of the pulley near the commutation mechanism. The magnet can apply a magnetic attraction force to the commutation mechanism, so that the commutation mechanism can resist the pulley under the action of the magnet. On the one hand, when the wiring connecting the coil fails or the engine ECU control module fails and cannot supply power to the coil, the commutation mechanism can still rotate with the pulley using the magnetic attraction force of the magnet to achieve heat dissipation of the radiator, thereby ensuring the heat dissipation performance of the engine. On the other hand, the magnetic field generated by the iron core and the magnetic field generated by the electromagnet can be superimposed to generate a large magnetic attraction force on the commutation mechanism, thereby increasing the connection stability between the commutation mechanism and the pulley, and ensuring that the commutation mechanism can rotate synchronously with the pulley.

[0037] 3. In this application, a follower disk is provided at the end of the pulley near the reversing mechanism, and a magnet is provided on the follower disk. This increases the contact area between the reversing mechanism and the pulley, thereby increasing the stability of the magnetic attraction between the reversing mechanism and the pulley. On the other hand, placing the magnet on the follower disk reduces the distance between the magnet and the reversing mechanism, ensuring the magnetic attraction force that the magnet can apply to the reversing mechanism, and thus ensuring the stability of the reversing mechanism when it rotates with the pulley under the action of the magnet. Attached Figure Description

[0038] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0039] Figure 1 This is a schematic diagram of the structure of the electromagnetic clutch commutation fan described in one embodiment of this application;

[0040] Figure 2 This is a schematic diagram of the electromagnetic clutch commutation fan from another perspective in one embodiment of this application;

[0041] Figure 3 This is a cross-sectional view of an electromagnetic clutch commutation fan according to one embodiment of this application, wherein the fan blades are not shown in the figure;

[0042] Figure 4 This is an exploded schematic diagram of an electromagnetic clutch commutation fan according to one embodiment of this application, wherein the fan blades are not shown in the figure;

[0043] Figure 5 This is a schematic diagram of the structure of the connecting disk in one embodiment of this application.

[0044] Figure label:

[0045] 1. Commutating fan body; 11. Commutating mechanism; 111. Connecting plate; 112. Magnetic conductor; 113. Heat dissipation fins; 114. Guide seat; 12. Fan blade; 2. Pulley; 21. Bearing; 22. Follower plate; 221. Magnet; 222. Guide rib; 3. Clutch mechanism; 4. Bracket; 41. Guide shaft. Detailed Implementation

[0046] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0047] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0048] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0049] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "a particular embodiment," "example," or "specific example," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0051] Reference Figures 1 to 5 An electromagnetic clutch commutator fan for an engine is disclosed, comprising a commutator fan body 1, a pulley 2, a clutch mechanism 3, and a bracket 4. The commutator fan body 1 includes a commutator mechanism 11 and a plurality of fan blades 12 disposed around the commutator mechanism 11, and the commutator mechanism 11 can adjust the angle of the fan blades 12. The pulley 2 is coaxially arranged with the commutator mechanism 11. The clutch mechanism 3 includes an iron core and a coil disposed on the pulley 2. When the coil is energized, the iron core can generate a magnetic attraction force on the commutator mechanism 11 toward the pulley 2, so that the commutator mechanism 11 abuts against the pulley 2 and rotates with the pulley 2. The bracket 4 passes through the pulley 2 and extends into the commutator mechanism 11 to support the pulley 2 and the commutator mechanism 11.

[0052] It is understood that the commutation mechanism 11 has multiple fan blade shafts around its periphery, and the fan blades 12 are arranged one-to-one with the fan blade shafts, with each fan blade 12 fixedly connected to its corresponding fan blade shaft. When the commutation mechanism 11 adjusts the angle of the fan blades 12, the fan blade shaft drives the fan blades 12 to rotate around its own central axis, thereby adjusting the angle of the fan blades 12 so that the commutation fan body 1 can switch between suction and blowing states without changing the direction of rotation. The coil is located outside the iron core, and when the coil is energized, the iron core can generate a magnetic field to produce a magnetic attraction force on the commutation mechanism. The coil is electrically connected to the engine's ECU control module so that the ECU control module can control the power supply, power cut-off, current direction, and current magnitude adjustment of the coil.

[0053] When using the electromagnetic clutch reversing fan in this application, the pulley 2 in this application is connected to the crankshaft pulley of the engine by a transmission belt, so that the pulley 2 in this application can rotate synchronously with the crankshaft pulley under the action of the transmission belt.

[0054] When the engine is cold-started or at a low temperature after starting, it is not necessary to energize the coil to allow the pulley 2 and commutator 11 to rotate relative to each other. This prevents the commutator 11 from rotating with the pulley 2, reducing the engine load during cold starts or when the engine temperature is low, thereby improving the utilization efficiency of engine output power and reducing engine fuel consumption. However, when the engine temperature rises and the radiator needs to dissipate heat, the coil is energized to generate a magnetic field in the iron core, causing the iron core to move towards the commutator 11. The magnetic attraction in the direction of pulley 2 causes the reversing mechanism 11 to abut against pulley 2 and rotate with pulley 2, so that the reversing fan body 1 rotates with the crankshaft pulley, thereby achieving heat dissipation of the radiator to reduce the engine temperature; when the radiator is back-blown for dust removal, the ECU control module sends a signal to the reversing mechanism 11, and the reversing mechanism 11 adjusts the angle of the fan blade 12, thereby adjusting the fan blade 12 from the suction angle to the blowing angle, so as to achieve back-blowing of the radiator, thus realizing the back-blowing of the radiator by using the electromagnetic clutch reversing fan.

[0055] As the engine temperature gradually increases, the coil needs to be energized to generate a magnetic field in the iron core and attract the commutation mechanism 11 using magnetic attraction. Initially, a small current can be applied to the coil, and then the current can be adjusted to gradually increase and eventually stabilize. This causes the magnetic field generated by the iron core to gradually increase and stabilize, thereby increasing the magnetic attraction of the iron core to the commutation mechanism 11. Eventually, the commutation mechanism 11 gradually attracts to the pulley 2, thus avoiding a sudden impact on the drive belt caused by the commutation mechanism 11 instantly attracting to the pulley 2. This prevents the belt from easily fatigue-breaking and ensures the reliability of the engine.

[0056] In addition, the electromagnetic clutch commutator fan in this application can also adjust the magnetic force applied by the iron core to the commutator mechanism 11 by adjusting the current of the coil, so that the commutator mechanism 11 can rotate asynchronously with the pulley 2, that is, there is a speed difference between the pulley 2 and the commutator mechanism 11, so that the rotation speed of the commutator mechanism 11 can be adjusted according to the engine temperature to reduce the auxiliary power of the engine, thereby further reducing the engine fuel consumption.

[0057] In summary, the electromagnetic clutch reversing fan in this application not only reduces fuel consumption during engine startup or when the engine temperature is low, but also improves the utilization rate of engine output power during engine startup or when the engine temperature is low. At the same time, it avoids the situation where the drive belt is easily fatigued and broken due to instantaneous impact, thereby ensuring the reliability of the engine.

[0058] This application does not specifically limit the structure of the commutator fan body 1, which can be either a hydraulic commutator fan or a pneumatic commutator fan. The specific structure of the commutator fan body 1 has been disclosed in the prior art and will not be described in detail here.

[0059] In a preferred embodiment, refer to Figure 3 The iron core and the coil are both located inside the pulley 2 to make reasonable use of the internal space of the pulley 2 and reduce the volume of the electromagnetic clutch reversing fan. In other words, the bracket 4 is simultaneously installed inside the iron core and the coil.

[0060] In a preferred embodiment, refer to Figure 3 and Figure 4 The pulley 2 has a bearing 21 inside, which is sleeved on the bracket 4 to reduce the friction between the pulley 2 and the bracket 4, thereby reducing the friction when the pulley 2 rotates, and thus reducing the load on the engine and reducing the fuel consumption of the engine.

[0061] In a preferred embodiment, refer to Figure 3 and Figure 4A magnet 221 is provided at one end of the pulley 2 near the reversing mechanism 11. The magnet 221 can apply a magnetic attraction force to the reversing mechanism 11 so that the reversing mechanism 11 can abut against the pulley 2 under the action of the magnet 221.

[0062] By setting up electromagnet 221, on the one hand, when the circuit connecting the coil malfunctions or the engine ECU control module malfunctions and cannot supply power to the coil, the commutation mechanism 11 can still rotate with the pulley 2 using the magnetic attraction of electromagnet 221 to achieve heat dissipation of the radiator, thereby ensuring the heat dissipation performance of the engine. On the other hand, the magnetic field generated by the iron core and the magnetic field generated by electromagnet 221 can be superimposed to generate a large magnetic attraction force on the commutation mechanism 11, thereby increasing the connection stability between the commutation mechanism 11 and the pulley 2, and ensuring that the commutation mechanism 11 can rotate synchronously with the pulley 2.

[0063] Furthermore, the coil has a first energized state and a second energized state. In the first energized state, the direction of the magnetic field generated by the iron core is the same as the direction of the magnetic field generated by the magnet 221. In the second energized state, the direction of the magnetic field generated by the iron core is opposite to the direction of the magnetic field generated by the magnet 221.

[0064] It is understandable that in the first and second energized states, the current directions in the coil are opposite to each other. When the coil is not energized, the commutation mechanism 11 can be magnetically attracted to the pulley 2 under the magnetic attraction of the magnet 221. However, the clamping force between the two is insufficient to make the commutation mechanism 11 rotate synchronously with the pulley 2. Thus, when the coil is not energized, the commutation mechanism 11 can rotate with the pulley 2, but the rotational speed of the commutation mechanism 11 is less than the rotational speed of the pulley 2. In other words, when the coil is not conducting electricity, there is a speed difference between the pulley 2 and the commutation mechanism 11.

[0065] Since the magnetic field generated by the iron core in the first energized state is in the same direction as the magnetic field generated by the magnet 221, the magnetic field generated by the iron core and the magnetic field generated by the magnet 221 can be superimposed to increase the magnetic attraction force applied to the commutation mechanism 11, thereby ensuring the stability of the magnetic attraction between the commutation mechanism 11 and the pulley 2, and ensuring the synchronous rotation of the commutation mechanism 11 and the pulley 2. Since the magnetic field generated by the iron core in the second energized state is in the opposite direction to the magnetic field generated by the magnet 221, the magnetic field generated by the iron core and the magnetic field generated by the magnet 221 can cancel each other out to adjust the magnetic attraction force applied to the commutation mechanism 11, thereby adjusting the speed difference between the commutation mechanism 11 and the pulley 2 or achieving the effect of the pulley 2 rotating while the commutation mechanism 11 remains stationary.

[0066] This application does not specify a particular method for installing magnet 221; preferably, refer to [reference needed]. Figure 3 and Figure 4 A follower disk 22 is provided at one end of the pulley 2 near the reversing mechanism 11, and a magnet 221 is provided on the follower disk 22.

[0067] It is understandable that the follower disk 22 is fixedly connected to the pulley 2 and is coaxially arranged with the pulley 2 so that the follower disk 22 and the magnet 221 can rotate synchronously with the pulley 2.

[0068] Since the pulley 2 has a follower disk 22 at one end near the reversing mechanism 11, the contact area between the reversing mechanism 11 and the pulley 2 is increased, thereby increasing the stability of the magnetic attraction between the reversing mechanism 11 and the pulley 2. On the other hand, placing the magnet 221 on the follower disk 22 can reduce the distance between the magnet 221 and the reversing mechanism 11, so as to ensure the magnetic attraction force that the magnet 221 can apply to the reversing mechanism 11, thereby ensuring the stability of the reversing mechanism 11 when it rotates with the pulley 2 under the action of the magnet 221.

[0069] This application does not specifically limit the shape of magnet 221; preferably, refer to... Figure 4 The magnet 221 has a circular cross-section, and multiple magnets 221 are evenly spaced along the circumference of the follower disk 22. This ensures the stability of the magnetic connection between the commutation mechanism 11 and the pulley 2 under the magnetic attraction of the magnet 221, while reducing the production cost of the electromagnetic clutch commutation fan. In other embodiments, the magnet 221 can also be ring-shaped or other shapes.

[0070] The better one is to refer to Figure 4 The follower disk 22 is provided with a receiving hole corresponding to the magnet 221. The magnet 221 is placed in the receiving hole to limit the magnet 221 and increase the connection stability between the magnet 221 and the follower disk 22.

[0071] In other embodiments, the design of the follower disk 22 can be omitted, and the magnet 221 can be directly fixed to the end face of the pulley 2 near the reversing mechanism 11.

[0072] This application does not specify the specific method of contact between the reversing mechanism 11 and the pulley 2. Preferably, refer to Figures 3 to 5 The reversing mechanism 11 is coaxially provided with a connecting plate 111. The reversing mechanism 11 abuts against the pulley 2 through the connecting plate 111, thereby reducing the damage to the reversing mechanism 11 when relative friction occurs between the pulley 2 and the reversing mechanism 11, and extending the service life of the reversing mechanism 11.

[0073] It is understood that the connecting plate 111 is fixedly connected to the reversing mechanism 11 so that the connecting plate 111 can drive the reversing mechanism 11 to rotate synchronously; in the above-mentioned scheme where a follower plate 22 is provided at the end of the pulley 2, the reversing mechanism 11 abuts against the follower plate 22 through the connecting plate 111.

[0074] This application does not specify the material for the connecting plate 111; preferably, refer to... Figure 4 The connecting plate 111 is provided with a magnetic conductor 112 that can be attracted by a magnetic field on the side opposite to the reversing mechanism 11. The connecting plate 111 abuts against the pulley 2 through the magnetic conductor 112.

[0075] It is understandable that the connecting disc 111 is made of a non-ferromagnetic material, such as aluminum, copper, or other metals; while the magnetic conductor 112 is made of a ferromagnetic material, such as iron, iron-cobalt-vanadium alloy, or other metals or alloys.

[0076] Since the connecting plate 111 abuts against the pulley 2 through the magnetic conductor 112, and the magnetic conductor 112 can be magnetically attracted by the magnetic field, the connecting plate 111 can be made of a material that is non-ferromagnetic and has good thermal conductivity, so as to improve the heat dissipation effect of the coil, thereby avoiding the situation where the coil is prone to high temperature and affects the service life of the coil, and further ensuring the reliability of the engine.

[0077] In other embodiments, the connecting disk 111 can be made of ferromagnetic materials such as iron, so that the design of the magnetic conductor 112 can be directly omitted.

[0078] Furthermore, refer to Figure 5 The connecting disk 111 is provided with heat dissipation fins 113 on the side near the reversing mechanism 11, and multiple heat dissipation fins 113 are provided at intervals along the circumference of the connecting disk 111.

[0079] Understandably, multiple heat dissipation fins 113 are evenly spaced along the circumference of the connecting plate 111 to ensure a uniform weight distribution on the connecting plate 111 and improve the dynamic balance of the connecting plate 111 during rotation.

[0080] Since the heat dissipation fins 113 are provided on the side of the connecting plate 111 near the commutation mechanism 11, the heat generated by the coil can be quickly conducted to the side of the connecting plate 111 away from the pulley 2, thereby improving the heat dissipation efficiency and effect of the coil; since multiple heat dissipation fins 113 are provided at intervals along the circumference of the connecting plate 111, the heat dissipation efficiency and effect of the coil are further improved.

[0081] Furthermore, refer to Figure 3 and Figure 4The connecting plate 111 is provided with a guide seat 114, the guide seat 114 has a guide hole, and the bracket 4 has a guide shaft 41 that extends into the guide hole.

[0082] When the reversing mechanism 11 moves toward the pulley 2 under the action of magnetic attraction, the reversing mechanism 11 drives the connecting plate 111 to move, and the connecting plate 111 drives the guide seat 114 to move, so that the guide shaft 41 slides relative to the guide hole. Thus, the guide shaft 41 and the guide hole are used to guide the reversing mechanism 11, thereby increasing the motion stability of the reversing mechanism 11. At the same time, the cooperation between the guide shaft 41 and the guide hole can also increase the cooperation area between the bracket 4 and the reversing mechanism 11, thereby increasing the support stability of the bracket 4 for the reversing mechanism 11.

[0083] Furthermore, refer to Figure 3 and Figure 4 A follower disc 22 is provided at one end of the pulley 2 near the reversing mechanism 11. The follower disc 22 is provided with a guide rib position 222. The guide seat 114 extends into the guide rib position 222. The cooperation between the guide seat 114 and the guide rib position 222 can be used to guide and support the reversing mechanism 11, thereby increasing the number of guide and support points for the reversing mechanism 11 and further increasing the stability of the reversing mechanism 11.

[0084] This application does not specifically limit the formation of the guide rib position 222. Preferably, the follower disk 22 is provided with a central hole, and an annular rib extends from the periphery of the central hole toward the interior of the pulley 2. The annular rib forms the guide rib position 222 to increase the guiding engagement area between the guide seat 114 and the guide rib position 222, thereby further increasing the stability of the reversing mechanism 11 when it moves axially along the guide shaft 41. In other embodiments, the design of the annular rib can be omitted, that is, the guide rib position 222 is formed by the wall of the central hole.

[0085] Furthermore, the connecting plate 111 is provided with a through hole corresponding to the center hole, and the end of the guide shaft 41 away from the bracket 4 is provided with a threaded hole. A limit bolt is threaded into the threaded hole. The bolt head diameter of the limit bolt is larger than the diameter of the through hole, and the bolt head of the limit bolt is located on the side of the connecting plate 111 away from the pulley 2. This allows the bolt head of the limit bolt to cooperate with the stop of the connecting plate 111 to limit the reversing mechanism 11, so as to prevent the reversing mechanism 11 from disengaging from the guide shaft 41 in the axial direction, thereby increasing the stability of the reversing fan body 1.

[0086] Furthermore, the connecting plate 111 is provided with an elastic sheet, and the magnetic conductor 112 is provided with a clearance hole for the end of the elastic sheet to extend out. This allows the end of the elastic sheet to extend through the clearance hole and apply an elastic force away from the reversing mechanism 11 to the follower plate 22. Subsequently, when the magnetic field generated by the iron core completely cancels out the magnetic field generated by the magnet 221, the reversing mechanism 11 can move away from the pulley 2 under the action of the elastic sheet, thereby separating the magnetic conductor 112 from the follower plate 22. This reduces the friction between the magnetic conductor 112 and the follower plate 22, thereby reducing the wear of the magnet 221 and the follower plate 22, and further ensuring the reliability of the engine. In addition, by providing the elastic sheet on the connecting plate 111 and allowing the end of the elastic sheet to extend through the clearance hole provided in the magnetic conductor 112, the connection stability between the elastic sheet and the connecting plate 111 can be increased, and the contact area between the follower plate 22 and the magnet 112 can be guaranteed.

[0087] In other embodiments, the connecting plate 111 can be omitted so that the reversing mechanism 11 directly contacts the pulley 2. That is, the housing of the reversing mechanism 11 itself is ferromagnetic, so as to reduce the manufacturing cost of the electromagnetic clutch reversing fan.

[0088] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0089] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0090] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. An electromagnetic clutch reversing fan for an engine, characterized by, include: The commutator fan body (1) includes a commutator mechanism (11) and a plurality of fan blades (12) disposed around the commutator mechanism (11), and the commutator mechanism (11) is capable of adjusting the angle of the fan blades (12); A pulley (2) is coaxially arranged with the reversing mechanism (11); The clutch mechanism (3) includes an iron core and a coil disposed on the pulley (2). When the coil is energized, the iron core can generate a magnetic attraction force on the reversing mechanism (11) toward the pulley (2), so that the reversing mechanism (11) abuts against the pulley (2) and rotates with the pulley (2). A bracket (4) passes through the pulley (2) and extends into the reversing mechanism (11) to support the pulley (2) and the reversing mechanism (11).

2. An electromagnetic clutch commutated fan for an engine according to claim 1, characterized in that, A magnet (221) is provided at one end of the pulley (2) near the reversing mechanism (11). The magnet (221) can apply a magnetic attraction force to the reversing mechanism (11) so that the reversing mechanism (11) can abut against the pulley (2) under the action of the magnet (221).

3. An electromagnetic clutch commutated fan for an engine according to claim 2, characterized in that, The pulley (2) is provided with a follower disk (22) at one end near the reversing mechanism (11), and the magnet (221) is provided on the follower disk (22).

4. An electromagnetic clutch commutated fan for an engine according to claim 2, wherein The coil has a first energized state and a second energized state. In the first energized state, the magnetic field generated by the iron core is in the same direction as the magnetic field generated by the magnet (221). In the second energized state, the magnetic field generated by the iron core is in the opposite direction to the magnetic field generated by the magnet (221).

5. An electromagnetic clutch commutated fan for an engine according to claim 1, wherein The reversing mechanism (11) is coaxially provided with a connecting disc (111), and the reversing mechanism (11) abuts against the pulley (2) through the connecting disc (111).

6. An electromagnetic clutch commutated fan for an engine according to claim 5, wherein The connecting disc (111) is provided with a magnetic conductor (112) that can be attracted by a magnetic field on the side away from the reversing mechanism (11), and the connecting disc (111) abuts against the pulley (2) through the magnetic conductor (112).

7. An electromagnetic clutch commutated fan for an engine according to claim 5, wherein The connecting disk (111) is provided with heat dissipation fins (113) on the side near the reversing mechanism (11), and multiple heat dissipation fins (113) are provided at intervals along the circumference of the connecting disk (111).

8. An electromagnetic clutch commutated fan for an engine according to claim 6, wherein The connecting plate (111) is provided with a guide seat (114), the guide seat (114) has a guide hole, and the bracket (4) has a guide shaft (41) extending into the guide hole.

9. An electromagnetic clutch commutated fan for an engine according to claim 8, wherein The pulley (2) is provided with a follower disc (22) at one end near the reversing mechanism (11), the follower disc (22) is provided with a guide rib position (222), and the guide seat (114) extends into the guide rib position (222).

10. An electromagnetic clutch commutated fan for an engine according to claim 9, wherein The connecting disc (111) is provided with elastic sheets, and the magnetic conductor (112) is provided with avoiding holes for the end portions of the elastic sheets to extend out, so that the end portions of the elastic sheets can extend out through the avoiding holes and exert elastic force on the follow-up disc (22) away from the commutating mechanism (11).

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