Cooling fan, engine assembly and vehicle

Abstract

The utility model belongs to the technical field of vehicles, and discloses a cooling fan, an engine assembly and a vehicle. The cooling fan comprises a fan main shaft, fan blades, a piston structure, a connecting structure and a clutch device. The fan spindle can rotate around the axis of the fan spindle and is hollow to form a mounting space, a blade center shaft of the fan blade penetrates through the fan spindle, and one end of the blade center shaft extends into the mounting space. The clutch device is connected to the fan spindle and can adjust the rotating speed of the fan spindle. The piston structure is coaxially arranged in the mounting space and can move in the axial direction of the fan main shaft; the connecting structure is eccentrically connected to the blade center shaft and arranged on the peripheral side of the piston structure, and the connecting structure can be connected to the piston structure in a relatively movable mode; the connecting structure can move in the axial direction of the fan main shaft along with the piston structure, and the blade center shaft can be driven by movement of the connecting structure to rotate around the axis of the blade center shaft. The cooling fan can enlarge the cooling capacity adjusting range and improve the cooling capacity adjusting accuracy.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field especially, relate to a heat dissipation fan, engine assembly and vehicle. BACKGROUND

[0002] The engine adopts the heat dissipation fan to carry out heat dissipation. In prior art, generally adopts the electromagnetic clutch to adjust the rotating speed of fan, and then satisfies the requirement of heat dissipation under different working conditions of engine. The existing heat dissipation fan of engine generally includes fan, clutch and electromagnetic valve. The fan is fixed together with the clutch through bolt, and specifically is the input clutch oil is adjusted by the electromagnetic valve, and then the combination degree of clutch friction plate is adjusted, and then the rotating speed of fan is adjusted, so that the same fan is suitable for different heat dissipation requirements of engine.

[0003] The above-mentioned mode of adjusting the heat dissipation capacity of fan only utilizes the electromagnetic valve and clutch to adjust the rotating speed of fan, and the adjustment range of heat dissipation capacity of fan is small, and it is difficult to adapt to the adjustment requirement of heat dissipation under the wide working range of engine.

[0004] Therefore, a heat dissipation fan, engine assembly and vehicle are needed to solve the above problems. UTILITY MODEL CONTENTS

[0005] According to one aspect of the utility model, the purpose is to provide a heat dissipation fan, which can expand the range of heat dissipation capacity adjustment and improve the accuracy of heat dissipation capacity adjustment.

[0006] To achieve this purpose, the utility model adopts the following technical scheme:

[0007] The heat dissipation fan comprises:

[0008] The fan main shaft can rotate around its axis and is hollow inside to form an installation space;

[0009] The fan blade is provided with a blade center shaft, and one end of the blade center shaft extends into the installation space;

[0010] The piston structure is coaxially arranged in the installation space and can move along the axial direction of the fan main shaft;

[0011] The connecting structure is eccentrically connected to the blade center shaft and arranged on the peripheral side of the piston structure, and the connecting structure is movably connected to the piston structure;

[0012] The connecting structure can move along the axial direction of the fan main shaft together with the piston structure, and the blade center shaft can rotate around its axis under the movement of the connecting structure;

[0013] The clutch device is connected to the fan spindle and can adjust the speed of the fan spindle.

[0014] As a preferred embodiment of the cooling fan provided by this utility model, the connection structure includes a connecting shaft and a moving block. The connecting shaft is fixedly connected to one side of the moving block and connected to the end of the blade central axis. The connecting shaft is eccentrically arranged with respect to the blade central axis.

[0015] The piston structure forms a circumferential abutment platform, and the movable block abuts against the abutment platform. The movable block is movable relative to the abutment platform (310).

[0016] As a preferred embodiment of the cooling fan provided by this utility model, the connecting structure is capable of moving circumferentially along the piston structure.

[0017] As a preferred embodiment of the cooling fan provided by this utility model, the piston structure can be positioned with the connecting structure in the axial direction of the blade central axis; the blade central axis can rotate in the positive direction around its own axis as the piston structure moves.

[0018] A first elastic element is provided between the blade central shaft and the fan main shaft; the blade central shaft can rotate in the opposite direction around its own axis under the elastic action of the first elastic element.

[0019] As a preferred embodiment of the cooling fan provided by this utility model, a piston control chamber is formed at the central axis of the installation space, and the pressure in the piston control chamber can be adjusted; the piston structure can move from the first dead point to the second dead point under the pressure in the piston control chamber.

[0020] The cooling fan also includes a second elastic element, which is disposed between the piston structure and the inner wall of the mounting space. The piston structure can move from the second dead point to the first dead point under the action of the second elastic element.

[0021] As a preferred embodiment of the cooling fan provided by this utility model, the piston structure is provided with a first mounting groove, and one end of the second elastic element is installed in the first mounting groove;

[0022] The inner wall of the installation space is provided with a second installation groove, and the other end of the second elastic element is installed in the second installation groove.

[0023] As a preferred embodiment of the cooling fan provided by this utility model, the cooling fan further includes a control valve and a hydraulic oil source. The hydraulic oil source is connected to the piston control chamber through the control valve, and the control valve can control the amount of hydraulic oil entering the piston control chamber.

[0024] As a preferred embodiment of the cooling fan provided by this utility model, the cooling fan further includes an oil inlet pipe, which passes through the piston structure and extends into the piston control chamber. The control valve is connected to the piston control chamber through the oil inlet pipe, and a sealing structure is provided between the oil inlet pipe and the piston structure.

[0025] According to another aspect of the present invention, the object is to provide an engine assembly comprising an engine body and a cooling fan as described in any of the above embodiments, the cooling fan being configured to dissipate heat from the engine body.

[0026] According to another aspect of the present invention, the object is to provide a vehicle comprising an engine assembly as described above.

[0027] The beneficial effects of this utility model are:

[0028] The cooling fan provided by this utility model includes a fan main shaft, fan blades, a piston structure, a connecting structure, and a clutch device. The fan main shaft can rotate around its own axis and has a hollow interior forming an installation space. The central axis of the fan blades passes through the fan main shaft and extends into the installation space at one end. By driving the rotation of the fan blades through the fan main shaft, cooling of the engine body and other components can be achieved. The clutch device is connected to the fan main shaft and can adjust the rotational speed of the fan main shaft. In other words, the cooling capacity of the cooling fan can be adjusted through the clutch device. The piston structure is coaxially arranged in the installation space and can move along the axial direction of the fan main shaft. The connecting structure is eccentrically connected to the central axis of the blades and is arranged on the periphery of the piston structure. The connecting structure is relatively movably connected to the piston structure. The connecting structure can move along the axial direction of the fan main shaft together with the piston structure, and the central axis of the blades can rotate around its own axis under the movement of the connecting structure. In other words, through the movement of the piston structure and the limiting effect of the fan spindle on the central axis of the fan blades, the central axis of the blades can rotate around its own axis, thereby adjusting the angle of the fan blades to achieve a balance between the air pressure and air volume of the cooling fan. Based on the adjustment of the cooling capacity of the cooling fan by the clutch device, the range of cooling capacity adjustment of the cooling fan is further expanded, and the accuracy of cooling capacity adjustment is improved.

[0029] The engine assembly provided by this utility model is equipped with the aforementioned cooling fan, which can provide the most suitable heat dissipation for the engine body, adapt to the heat dissipation adjustment needs of the engine body over a wide operating range, and thus ensure the power performance of the engine body.

[0030] The vehicle provided by this utility model includes the aforementioned engine assembly, which is beneficial for improving the vehicle's power performance. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model 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 the content of the embodiments of this utility model and these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the cooling fan provided in an embodiment of the present invention;

[0033] Figure 2 This is a side view of the cooling fan provided in an embodiment of the present utility model;

[0034] Figure 3 This is a partial structural cross-sectional view of the cooling fan provided in an embodiment of this utility model;

[0035] Figure 4 yes Figure 3 A magnified view of a section marked A in the middle;

[0036] Figure 5 yes Figure 3 A magnified view of a section marked B in the middle;

[0037] Figure 6 This is a cross-sectional view of the cooling fan provided in this embodiment of the present invention when the piston structure is at the first dead center;

[0038] Figure 7 yes Figure 6 A magnified view of a section marked C in the middle;

[0039] Figure 8 This is a cross-sectional view of the cooling fan provided in this embodiment of the present invention when the piston structure is at the second dead center;

[0040] Figure 9 yes Figure 8 A magnified view of the structure marked D in the middle.

[0041] In the picture:

[0042] 100. Fan spindle; 110. Piston control chamber; 120. Control port; 130. Second mounting slot; 140. Receiving slot;

[0043] 200. Fan blades; 210. Blade central shaft;

[0044] 300. Piston structure; 310. Abutting ring platform; 320. First mounting groove;

[0045] 400. Connecting structure; 410. Connecting shaft; 420. Moving block;

[0046] 500, Second elastic element;

[0047] 600. Control valve; 610. Fan oil supply pipe; 620. Clutch oil supply pipe; 630. Clutch return pipe; 640. Hydraulic oil source connection pipe;

[0048] 710. Oil inlet pipe; 720. Sealing structure; 730. Oil return structure; 731. Oil return connector; 732. Oil return channel;

[0049] 800. Clutch device. Detailed Implementation

[0050] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0053] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0054] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for 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. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0055] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connect," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0056] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0057] In this embodiment, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0058] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0059] This embodiment provides a cooling fan, an engine assembly, and a vehicle. The vehicle includes the engine assembly provided in this embodiment. The engine assembly includes an engine body and a cooling fan provided in this embodiment, the cooling fan being configured to dissipate heat from the engine body.

[0060] Figure 1 This diagram shows a structural schematic of the cooling fan provided in an embodiment of the present invention. Figure 2 A side view of a cooling fan provided in an embodiment of the present invention is shown. (Refer to...) Figure 1 and Figure 2 The cooling fan provided in this embodiment includes a fan spindle 100, fan blades 200, and a clutch device 800.

[0061] Specifically, the fan spindle 100 is rotatable around its own axis, and its hollow interior forms an installation space. Multiple fan blades 200 are evenly arranged circumferentially on the fan spindle 100, with the central axis 210 of each blade passing through the spindle 100 and extending into the installation space at one end. A clutch device 800 is connected to the fan spindle 100 and can adjust the rotational speed of the spindle 100. In other words, the cooling capacity of the cooling fan can be adjusted through the clutch device 800.

[0062] Figure 3 This diagram shows a partial structural cross-sectional view of the cooling fan provided in an embodiment of the present invention. Figure 4 Show Figure 3 A magnified view of the structure marked A in the middle. Figure 5 Show Figure 3 A magnified view of the structure marked B in the middle section. (Refer to...) Figures 3-5 The cooling fan also includes a piston structure 300 and a connecting structure 400.

[0063] Specifically, the piston structure 300 is coaxially disposed in the installation space and is capable of moving along the axial direction of the fan main shaft 100. The connecting structure 400 is eccentrically connected to the blade central shaft 210 and disposed on the periphery of the piston structure 300. The connecting structure 400 is relatively movably connected to the piston structure 300. The connecting structure 400 can move along the axial direction of the fan main shaft 100 together with the piston structure 300, and the blade central shaft 210 can rotate around its own axis under the movement of the connecting structure 400. The fan main shaft 100 has an axial limiting effect on the blade central shaft 210, and the blade central shaft 210 has only the degree of freedom to rotate around its own axis relative to the fan main shaft 100. Through the axial movement of the piston structure 300 along the fan main shaft 100 and the limiting effect of the fan main shaft 100 on the blade center axis 210, the rotation of the blade center axis 210 around its own axis can be realized, thereby adjusting the angle of the fan blades 200 to achieve a balance between the air pressure and air volume of the cooling fan. Based on the adjustment of the cooling capacity of the cooling fan by the clutch device 800, the range of cooling capacity adjustment of the cooling fan is further expanded, and the accuracy of cooling capacity adjustment is improved.

[0064] It should be noted that the fan's heat dissipation is related to both airflow and air pressure. Increasing the angle of the fan blades 200 increases airflow, while decreasing the angle of the fan blades 200 increases air pressure. Therefore, by adjusting the angle of the fan blades 200, the adjustment range of the fan's heat dissipation capacity can be further expanded beyond the speed adjustment by the clutch device 800, and the adjustment accuracy can be improved. For example, during engine cold starts or idling, if the cooling fan speed is too high, the engine will dissipate heat too quickly, hindering cold starts. In this case, decreasing the angle of the fan blades 200 reduces the cooling fan's heat dissipation at the same speed, facilitating engine cold starts.

[0065] Figure 6 This shows a cross-sectional view of the cooling fan provided in this embodiment of the present invention when the piston structure is at the first dead center; Figure 7 Show Figure 6 A magnified view of a section marked C in the middle; Figure 8 This shows a cross-sectional view of the cooling fan provided in this embodiment of the present invention when the piston structure is at the second dead center; Figure 9 Show Figure 8 A magnified view of the structure marked D in the middle. (Refer to...) Figures 3-9A piston control chamber 110 is formed at the central axis of the installation space, and the pressure in the piston control chamber 110 is adjustable. A control port 120 is provided at the top of the piston control chamber 110. The piston structure 300 is provided with a movable part, which is sleeved outside the piston control chamber 110, and the top of the movable part is positioned directly over the control port 120. The pressure in the piston control chamber 110 can act on the top of the movable part through the control port 120, thereby driving the piston structure 300 to move from the first dead center to the second dead center.

[0066] More specifically, the cooling fan also includes a second elastic element 500, which is coaxially arranged with and connected to the piston structure 300. The piston structure 300 can move from the second dead point to the first dead point under the action of the second elastic element 500. In this embodiment, the second elastic element 500 is specifically sleeved on the outside of the moving part. That is, the force exerted on the piston structure 300 by the pressure in the piston control chamber 110 and the force exerted on the piston structure 300 by the second elastic element 500 are in opposite directions. When the pressure in the piston control chamber 110 is greater than the elastic force of the second elastic element 500, the piston structure 300 moves from the first dead point to the second dead point, and the blade center shaft 210 rotates under the transmission action of the connecting structure 400, increasing the angle of the fan blade 200. When the pressure in the piston control chamber 110 is less than the elastic force of the second elastic element 500, the piston structure 300 moves from the second dead point to the first dead point, and the blade center shaft 210 rotates under the transmission action of the connecting structure 400, reducing the angle of the fan blade 200.

[0067] It should be noted that the cooling fan also includes an oil return structure 730, which connects the piston control chamber 110 and the control valve 600. Hydraulic oil in the piston control chamber 110 can flow back to the control valve 600 through the oil return structure 730. The oil return structure 730 includes an oil return connector 731 and an oil return channel 732. The oil return connector 731 is fixed to the fan main shaft 100, and the oil return channel 732 is opened in the oil return connector 731 and connects to the piston control chamber 110. When it is necessary to reduce the angle of the fan blades 200, the hydraulic oil in the piston control chamber 110 can be discharged through the oil return channel 732 under the control of the control valve 600, so that the piston structure 300 can move towards the first stop point under the elastic force of the second elastic element 500. In this embodiment, the control valve 600 can specifically be a solenoid valve.

[0068] More specifically, the piston structure 300 is provided with a first mounting groove 320, and one end of the second elastic element 500 is mounted in the first mounting groove 320. A second mounting groove 130 is provided on the inner wall of the mounting space, and the other end of the second elastic element 500 is mounted in the second mounting groove 130. In this embodiment, the first mounting groove 320 is formed circumferentially on the periphery of the moving part. The second mounting groove 130 is specifically formed at the second stop position of the piston structure 300 corresponding to the mounting space. Through the aforementioned first mounting groove 320 and second mounting groove 130, a reliable connection between the second elastic element 500 and the piston structure 300 can be achieved.

[0069] Continue to refer to Figure 4 , Figure 7 and Figure 9 The connection structure 400 includes a connecting shaft 410 and a moving block 420. The connecting shaft 410 is fixedly connected to one side of the moving block 420 and to the end of the blade central shaft 210, with the connecting shaft 410 and the blade central shaft 210 arranged eccentrically. The piston structure 300 forms a circumferential abutment 310, which is formed on the outer side of the second mounting groove 130. The bottom and the side of the moving block 420 facing away from the connecting shaft 410 abut against the abutment 310, which limits the movement of the moving block 420 in the axial direction of the blade central shaft 210. A top limiting member (not shown) is provided on the abutment 310, which abuts against the top of the moving block 420, thereby positioning the moving block 420 in the axial direction of the fan main shaft 100. The movable block 420 can move along the circumference of the piston structure 300 or in a direction that is angled to the generatrix of the piston structure 300 and parallel to the upper end face of the abutment ring 310 on the abutment ring 310. In this embodiment, the movable block 420 can move along the circumference of the piston structure 300.

[0070] When the piston structure 300 moves axially along the fan main shaft 100 and drives the blade center shaft 210 to rotate through the eccentrically connected connecting shaft 410, the moving block 420 will undergo a displacement along the circumference of the piston structure 300 on the abutment ring 310 under the reaction action of the blade center shaft 210 and the limiting action of the abutment ring 310. When the piston structure 300 moves from the first dead center to the second dead center, the blade center shaft 210 rotates in the positive direction, increasing the angle of the fan blades 200. When the piston structure 300 moves from the second dead center to the first dead center, the blade center shaft 210 rotates in the opposite direction, decreasing the angle of the fan blades 200.

[0071] It can be seen that when the piston structure 300 is at the first dead center, the central axis of the connecting shaft 410 is located below the central axis of the blade central shaft 210, as shown below. Figure 7 As shown. When the piston structure 300 is at the second dead center, the central axis of the connecting shaft 410 is located above the central axis of the blade central shaft 210, as shown. Figure 9 As shown.

[0072] In another embodiment, no top limiting member is provided on the abutment ring 310. In this case, the bottom of the moving block 420 and the side facing away from the connecting shaft 410 abut against the abutment ring 310. That is, the piston structure 300 can be positioned axially with the connecting structure 400 on the blade center shaft 210. The blade center shaft 210 can rotate in the positive direction around its own axis as the piston structure 300 moves from the first dead point to the second dead point, increasing the angle of the fan blade 200. Between the blade center shaft 210 and the fan main shaft 100, corresponding to the position where the blade center shaft 210 passes through the fan main shaft 100, a first elastic element (not shown) is provided, and the blade center shaft 210 can rotate in the opposite direction around its own axis under the elastic action of the first elastic element. In other words, when the piston structure 300 moves from the second dead center to the first dead center under the action of the second elastic element 500, the moving block 420 loses the pushing action of the piston structure 300. At this time, the blade center shaft 210 can rotate under the elastic action of the first elastic element, that is, reduce the angle of the fan blade 200. The first elastic element can specifically be a torsion spring in the prior art.

[0073] Specifically, refer to Figure 2 In this embodiment, the cooling fan also includes a control valve 600 and a hydraulic oil source. The hydraulic oil source and the control valve 600 are connected through a hydraulic oil source connecting pipe 640, and the control valve 600 is connected to the piston control chamber 110 through a fan oil supply pipe 610. The control valve 600 can control the amount of hydraulic oil entering the piston control chamber 110.

[0074] To be more specific, continue to refer to Figure 5The cooling fan also includes an oil inlet pipe 710, which passes through the top of the moving part of the piston structure 300 and extends into the piston control chamber 110. The control valve 600 is connected to the piston control chamber 110 through the oil inlet pipe 710. A sealing structure 720 is provided between the oil inlet pipe 710 and the piston structure 300. The diameter of the control port 120 is larger than the outer diameter of the oil inlet pipe 710, and the oil inlet pipe 710 and the control port 120 are coaxially arranged. The sealing structure 720 can specifically be a sealing ring. A sealing groove is formed on the inner peripheral wall of the through hole through which the oil inlet pipe 710 passes at the top of the moving part of the piston structure 300, and the sealing ring is installed in the sealing groove. Through the above-mentioned sealing structure 720, the piston control chamber 110 can be sealed to prevent hydraulic oil leakage.

[0075] More specifically, the fan spindle 100 is also provided with a receiving groove 140, which is independent of the installation space and connects the oil inlet pipe 710 and the fan oil supply pipe 610. The cross-sectional area of ​​the receiving groove 140 is larger than the diameter of the oil inlet pipe 710, and the receiving groove 140 is configured to receive hydraulic oil. Through the receiving groove 140, the hydraulic oil can be temporarily stored, avoiding the problem of oil spraying at the inlet of the oil inlet pipe 710 due to the small diameter of the oil inlet pipe under air pressure.

[0076] In this embodiment, the clutch device 800 is also controlled by hydraulic oil. This clutch device 800 is existing technology, and its principle is roughly as follows: The clutch device 800 and the control valve 600 are connected via a clutch oil supply pipe 620 and a clutch oil return pipe 630. The pulley on the clutch device 800 transmits power from the engine crankshaft to the friction plate assembly of the clutch device 800. This friction plate assembly is specifically a multi-layer composite friction plate. The control valve 600 transmits hydraulic oil to the friction plate assembly through the clutch oil supply pipe 620 to adjust the engagement degree of the multi-layer composite friction plate, thereby controlling the speed of the fan main shaft 100. Simultaneously, the control valve 600 also controls the return of oil from the multi-layer composite friction plate through the clutch oil return pipe 630.

[0077] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A cooling fan, characterized in that, include: The fan spindle (100) can rotate around its own axis, and its hollow interior forms an installation space; Fan blade (200), the central axis (210) of the fan blade (200) passes through the fan main shaft (100) and one end extends into the mounting space; The piston structure (300) is coaxially disposed in the mounting space and is capable of moving along the axial direction of the fan main shaft (100); A connecting structure (400) is eccentrically connected to the central shaft (210) of the blade and disposed on the periphery of the piston structure (300). The connecting structure (400) is relatively movably connected to the piston structure (300). The connecting structure (400) can move along the axial direction of the fan main shaft (100) together with the piston structure (300), and the blade center shaft (210) can rotate around its own axis under the movement of the connecting structure (400). A clutch device (800) is connected to the fan spindle (100) and can adjust the speed of the fan spindle (100).

2. The cooling fan according to claim 1, characterized in that, The connection structure (400) includes a connecting shaft (410) and a moving block (420). The connecting shaft (410) is fixedly connected to one side of the moving block (420) and connected to the end of the blade central shaft (210). The connecting shaft (410) and the blade central shaft (210) are eccentrically arranged. The piston structure (300) forms a circumferential abutment platform (310), and the movable block (420) abuts against the abutment platform (310). The movable block (420) is movable relative to the abutment platform (310).

3. The cooling fan according to claim 1, characterized in that, The connecting structure (400) is capable of moving circumferentially along the piston structure (300).

4. The cooling fan according to claim 1, characterized in that, The piston structure (300) is axially positioned with the connecting structure (400) on the blade central axis (210); the blade central axis (210) is rotatable about its own axis as the piston structure (300) moves. A first elastic element is provided between the blade central shaft (210) and the fan main shaft (100); the blade central shaft (210) can rotate in the opposite direction around its own axis under the elastic action of the first elastic element.

5. The cooling fan according to claim 1, characterized in that, A piston control chamber (110) is formed at the central axis of the installation space, and the pressure in the piston control chamber (110) can be adjusted; the piston structure (300) can move from the first dead point to the second dead point under the pressure in the piston control chamber (110); The cooling fan also includes a second elastic element (500), which is disposed between the piston structure (300) and the inner wall of the mounting space. The piston structure (300) is capable of moving from the second dead point to the first dead point under the action of the second elastic element (500).

6. The cooling fan according to claim 5, characterized in that, The piston structure (300) is provided with a first mounting groove (320), and one end of the second elastic element (500) is mounted in the first mounting groove (320); and / or, The inner wall of the installation space is provided with a second installation groove (130), and the other end of the second elastic element (500) is installed in the second installation groove (130).

7. The cooling fan according to claim 5, characterized in that, The cooling fan also includes a control valve (600) and a hydraulic oil source. The hydraulic oil source is connected to the piston control chamber (110) through the control valve (600). The control valve (600) can control the amount of hydraulic oil entering the piston control chamber (110).

8. The cooling fan according to claim 7, characterized in that, The cooling fan also includes an oil inlet pipe (710), which passes through the piston structure (300) and extends into the piston control chamber (110). The control valve (600) is connected to the piston control chamber (110) through the oil inlet pipe (710). A sealing structure (720) is provided between the oil inlet pipe (710) and the piston structure (300).

9. An engine assembly, characterized in that, It includes an engine body and a cooling fan as described in any one of claims 1-8, the cooling fan being configured to dissipate heat from the engine body.

10. A vehicle, characterized in that, Includes the engine assembly as described in claim 9.

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