Brushless electric supporting rod with built-in ECU

Abstract

The utility model discloses an ECU built-in brushless electric supporting rod, which comprises an outer sleeve, an inner sleeve, a double-shaft brushless motor, an ejection sleeve and an inner thread bushing, the inner thread bushing is in threaded connection with a screw rod, and one end of the screw rod is in transmission connection with a first output end of the double-shaft brushless motor through a first speed reducing mechanism; a sealing box and an end cover are arranged at the end, away from the screw, of the outer sleeve, an ECU control panel is arranged in the sealing box, a heat dissipation cavity is formed in the portion, between the end cover and the sealing box, of the outer sleeve, a wind wheel assembly is rotationally arranged in the heat dissipation cavity, an air inlet and an air outlet which are communicated with the heat dissipation cavity are formed in the side wall of the outer sleeve, and a semiconductor heat dissipation piece is embedded in the sealing box; the heat absorption end of the semiconductor heat dissipation piece is attached to the ECU control panel, and the heat dissipation end of the semiconductor heat dissipation piece is arranged in the heat dissipation cavity. The electric supporting rod is compact in structure and good in heat dissipation performance, and the service life of the electric supporting rod is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electric support rods for automobile tailgates, in particular to an ECU built-in brushless electric support rod. Background Art

[0002] The existing Chinese patent with announcement number CN213144192U discloses an electric strut and a car, which electric strut includes: an outer sleeve, an inner sleeve, which can be slidably inserted into the outer sleeve; a first fixed head, which is detachably connected to one end of the outer sleeve; a second fixed head, which is connected to the other end of the inner sleeve; and a driving assembly, which is accommodated in the outer sleeve, and the driving assembly includes a power component, an adapter, a screw and an inner guide tube, the power component is arranged near the first fixed head, the adapter cooperates with the first fixed head to clamp and fix the power component, the adapter is detachably connected to the outer sleeve, the screw passes through the adapter and is detachably connected to the power component, the inner guide tube is sleeved on the periphery of the screw, one end of the inner guide tube is threadedly connected to the screw, and the other end of the inner guide tube is detachably connected to the second fixed head.

[0003] However, the above-mentioned electric strut has the following disadvantages: the motor of the electric strut needs to be controlled by the ECU control board when working. In order to reduce the space occupied by the CU control board, the existing electric strut E usually adopts the method of integrating the ECU control board into the outer sleeve. However, this brings a problem, especially for high-end models whose tailgate can be hovered at any angle, and the ECU control board will process a large amount of data, while the built-in ECU control board has poor heat dissipation performance. If the tailgate of the car is repeatedly opened and closed or hovered at multiple angles, the ECU control board is prone to overheating and damage. Utility Model Content

[0004] The utility model aims to provide an ECU built-in brushless electric strut, which has the effects of compact structure, good heat dissipation performance and prolonged service life of the electric strut.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions: an ECU built-in brushless electric strut, comprising an outer sleeve and an inner sleeve, a dual-axis brushless motor is arranged in the outer sleeve, an ejector sleeve is slidably arranged in the inner sleeve, an internal thread sleeve is fixed in the ejector sleeve, a screw is threadedly connected to the internal thread sleeve, the screw is threadedly matched with the ejector sleeve through the internal thread sleeve, and one end of the screw is transmission-connected to the first output end of the dual-axis brushless motor through a first reduction mechanism;

[0006] The outer sleeve is provided with a sealing box and an end cover at one end away from the screw, the sealing box has an ECU control board built in, a heat dissipation cavity is formed between the end cover and the sealing box, a wind wheel assembly is rotatably arranged in the heat dissipation cavity, an air inlet and an air outlet connected to the heat dissipation cavity are formed on the side wall of the outer sleeve, a semiconductor heat sink is embedded in the sealing box, a heat absorbing end of the semiconductor heat sink is in contact with the ECU control board, and a heat dissipation end of the semiconductor heat sink is placed in the heat dissipation cavity, the second output end of the dual-axis brushless motor drives the wind wheel assembly to rotate through a second reduction mechanism, and drives air to be drawn into the heat dissipation cavity from the air inlet for heat exchange with the heat dissipation end of the semiconductor heat sink, and the heat in the heat dissipation cavity is discharged from the air outlet.

[0007] By adopting the above technical scheme, the ECU control board controls the operation and rotation of the dual-axis brushless motor, and the first output end of the dual-axis brushless motor drives the screw to rotate through the first reduction mechanism, and utilizes the threaded cooperation between the screw and the internal threaded sleeve and the sliding cooperation between the ejector sleeve and the inner sleeve so that the internal threaded sleeve pushes the ejector sleeve to extend out of the outer sleeve to realize the opening of the car tailgate. In this process, the heat generated by the ECU control board is absorbed by the heat absorption end of the semiconductor heat sink and transferred to the heat dissipation end. The second output end of the dual-axis brushless motor drives the wind wheel assembly to rotate through the second reduction mechanism, and the colder air is sucked into the heat dissipation cavity and heat exchanged with the heat dissipation end of the semiconductor heat sink. Finally, the heat in the heat dissipation cavity is discharged from the air outlet, which can effectively prevent the ECU control board from being damaged due to overheating and slow down the aging speed of electrical components. The utility model adopts a dual-axis brushless motor to provide driving force for the ejector sleeve and the wind wheel assembly at the same time, and there is no need to set a driving unit for the wind wheel assembly, which reduces the space occupied by the driving unit, and has the effects of compact structure, good heat dissipation performance and extended service life of the electric support rod.

[0008] The utility model is further configured as follows: the second reduction mechanism includes a driving gear, a first transmission gear, a first rotating shaft, and a second transmission gear and a first bevel gear fixed at both ends of the first rotating shaft; the driving gear is coaxially fixed to the second output end of the dual-shaft brushless motor; the two ends of the first transmission gear are respectively meshed with the driving gear and the second transmission gear; the wind wheel assembly includes a second rotating shaft rotatably arranged in the outer sleeve, fan blades and a second bevel gear fixed at both ends of the second rotating shaft; the first bevel gear is meshed with the second bevel gear.

[0009] By adopting the above technical solution, the dual-axis brushless motor drives the driving gear to rotate, the driving tooth path drives the second transmission gear to rotate through the first transmission gear, the second transmission gear then drives the first bevel gear to rotate through the first rotating shaft, and finally, through the meshing action of the first bevel gear and the second bevel gear, the fan blades are driven to rotate through the second rotating shaft, and the wind pressure formed by the fan blades in the heat dissipation cavity is used to discharge the heat generated in the heat dissipation cavity from the air outlet.

[0010] The utility model is further configured as follows: a through hole is penetrated through the sealing box corresponding to the first rotating shaft, a connecting pipe is fixedly arranged in the sealing box, two ends of the connecting pipe are connected with the corresponding through hole, and the first rotating shaft is movably arranged in the connecting pipe.

[0011] By adopting the above technical solution, the connecting pipe is used to isolate the space where the first rotating shaft is located from the space where the ECU control board is located in the sealed box, which can effectively prevent water vapor from entering the sealed box and causing a short circuit on the ECU control board.

[0012] The utility model is further configured as follows: both ends of the first rotating shaft are rotatably connected to the connecting pipe via bearings.

[0013] By adopting the above technical solution, the addition of the bearing can improve the smoothness of the rotation of the first rotating shaft in the connecting pipe, and prevent the first rotating shaft from getting stuck when rotating.

[0014] The utility model is further configured as follows: a waterproof sealing structure is provided between the first rotating shaft and the through hole of the sealing box, and the first rotating shaft is in sealing rotation cooperation with the sealing box through the waterproof sealing structure.

[0015] By adopting the above technical solution, the waterproof sealing structure can improve the sealing performance between the first rotating shaft and the connecting pipe, and effectively prevent water vapor from entering the space where the dual-axis brushless motor is located through the connecting pipe, causing the dual-axis brushless motor to short-circuit.

[0016] The utility model is further configured as follows: the waterproof sealing structure includes two waterproof sealing rings, the two waterproof sealing rings are sleeved outside the first rotating shaft and placed in the through hole, and the first rotating shaft is sealed and matched with the sealing box through the waterproof sealing rings.

[0017] By adopting the above technical solution, a plurality of waterproof sealing rings cooperate with each other, so as to improve the waterproof sealing degree between the first rotating shaft and the inner wall of the connecting pipe.

[0018] The utility model is further configured as follows: the outer sleeve is provided with an air filter element communicated with the heat dissipation cavity at the air inlet position.

[0019] By adopting the above technical solution, the air filter element can effectively absorb and remove moisture and dust in the air, preventing moisture and dust from entering the heat dissipation cavity from the air inlet, thereby improving the waterproof sealing performance of the utility model.

[0020] The utility model is further configured as follows: the outer sleeve is provided with a filter cover communicating with the heat dissipation cavity at the air outlet position.

[0021] By adopting the above technical solution, the addition of the filter cover can prevent dust or insects from entering the heat dissipation cavity from the air outlet.

[0022] The utility model is further configured as follows: the first reduction mechanism includes a driving helical gear, a helical internal gear ring and a plurality of helical planetary gears; the driving helical gear is coaxially fixed with the first output end of the dual-axis brushless motor; the driving helical gear is transmission-connected to the helical internal gear ring through a plurality of the helical planetary gears; the helical internal gear ring is fixedly connected to a connecting seat; and the connecting seat is transmission-connected to the screw through a clutch structure.

[0023] By adopting the above technical solution, the dual-axis brushless motor rotates to drive the driving helical gear to rotate, and the driving helical gear drives the helical inner gear ring and the connecting seat to rotate synchronously through the helical planetary gear, and then the connecting seat drives the screw to rotate through the clutch structure, and finally, by utilizing the threaded cooperation between the screw and the internal threaded sleeve and the sliding cooperation between the ejector sleeve and the inner sleeve, the ejector sleeve can be ejected outward relative to the outer sleeve, thereby realizing the opening of the car tailgate.

[0024] The utility model is further configured as follows: the clutch structure includes a clutch plate, a friction plate and a spring; the clutch plate is non-rotatably connected to the connecting seat; the friction plate is non-rotatably connected to the screw rod; the clutch plate and the friction plate are frictionally matched; and the spring always has a movement tendency to press the clutch plate and the friction plate against each other.

[0025] By adopting the above technical scheme, the spring presses the clutch plate and the friction plate against each other all the time, so that a friction pressing force is generated between the clutch plate and the friction plate. When the connecting seat rotates, the static friction between the clutch plate and the friction plate drives the screw to rotate, thereby driving the ejector sleeve to extend outward relative to the outer sleeve. When the ejector sleeve is subjected to a large compressive stress, and the compressive stress is greater than the friction pressing force between the clutch plate and the friction plate, the ejector sleeve retracts into the outer sleeve. In view of the situation where the tailgate of the automobile is subjected to a large upper pressure, the electric support rod can be effectively prevented from breaking.

[0026] In summary, the utility model has the following beneficial effects:

[0027] An inner sleeve, an ejector sleeve, a screw and a dual-axis brushless motor are arranged in an outer sleeve, and a sealing box is arranged in one end of the outer sleeve away from the ejector sleeve. An ECU control board for controlling the operation of the dual-axis brushless motor is arranged in the sealing box. The first output end of the dual-axis brushless motor drives the screw to rotate through a first reduction mechanism. The screw and the internal threaded sleeve in the ejector sleeve are matched with each other through threads, and the ejector sleeve and the inner sleeve are matched with each other through sliding. The ejector sleeve can be extended outward relative to the outer sleeve. During this process, heat generated by the operation of the ECU control board is absorbed by the heat absorption end of the semiconductor heat sink and transferred to the heat dissipation end. At the same time, the second output end of the dual-axis brushless motor drives the wind wheel assembly to rotate through the second reduction mechanism. The wind wheel draws cold air from the air inlet into the heat dissipation cavity and exchanges heat with the heat dissipation end, and discharges the heat from the heat dissipation end from the air outlet. The electric support has the effects of compact structure, good heat dissipation performance and extended service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of the utility model.

[0029] Figure 2 This utility model Figure 1 Longitudinal section view of .

[0030] Figure 3 This utility model Figure 2 A partial enlarged view of area A.

[0031] Figure 4 This utility model Figure 2 A partial enlarged view of area B.

[0032] Figure 5 This utility model Figure 2 A partial enlarged view of the middle C area.

[0033] In the figure: 1, outer sleeve; 1a, heat dissipation cavity; 1b, air inlet; 1c, air outlet; 11, dual-axis brushless motor; 12, wind wheel assembly; 120, second rotating shaft; 121, fan blade; 122, second bevel gear; 13, air filter element; 14, filter cover; 2, inner sleeve; 3, ejector sleeve; 31, internal thread sleeve; 4, screw; 5, sealing box; 5a, through hole; 51, ECU control board; 52, semiconductor heat sink; 52 a. heat absorption end; 52b. heat dissipation end; 53. connecting pipe; 54. bearing; 55. waterproof sealing ring; 6. end cover; 71. driving gear; 72. first transmission gear; 73. first rotating shaft; 731. second transmission gear; 732. first bevel gear; 81. driving helical gear; 82. helical inner gear ring; 83. helical planetary gear; 84. connecting seat; 9. clutch structure; 91. friction plate; 92. clutch plate; 93. spring. DETAILED DESCRIPTION

[0034] The utility model is further described below in conjunction with the accompanying drawings.

[0035] An ECU built-in brushless electric strut, such as Figure 1-5 As shown, it includes an outer sleeve 1 and an inner sleeve 2, a dual-axis brushless motor 11 is arranged in the outer sleeve 1, an ejection sleeve 3 is slidably arranged in the inner sleeve 2, an internal threaded sleeve 31 is fixed in the ejection sleeve 3, a screw 4 is threadedly connected to the internal threaded sleeve 31, the screw 4 is threadedly matched with the ejection sleeve 3 through the internal threaded sleeve 31, and one end of the screw 4 is transmission-connected to the first output end of the dual-axis brushless motor 11 through a first reduction mechanism; the outer sleeve 1 is provided with a sealing box 5 and an end cover 6 at the end away from the screw 4, the sealing box 5 is built with an ECU control board 51, a Hall sensor is arranged in the outer sleeve 1, the Hall sensor senses the extended length of the ejection sleeve 3, and feeds back a signal to the ECU control board 51, so as to control the extended length of the ejection sleeve 3, thereby realizing the multi-angle hovering of the tailgate, a heat dissipation cavity 1a is formed between the end cover 6 and the sealing box 5 of the outer sleeve 1, a wind wheel assembly 12 is rotatably arranged in the heat dissipation cavity 1a, and an air inlet 1b and an air outlet 1b connected to the heat dissipation cavity 1a are opened on the side wall of the outer sleeve 1 Port 1c, a semiconductor heat sink 52 is embedded in the sealing box 5, a heat absorbing end 52a of the semiconductor heat sink 52 is attached to the ECU control board 51, and a heat dissipation end 52b of the semiconductor heat sink 52 is placed in the heat dissipation cavity 1a, and the second output end of the dual-axis brushless motor 11 drives the wind wheel assembly 12 to rotate through the second reduction mechanism, and drives the air to be drawn into the heat dissipation cavity 1a from the air inlet 1b to exchange heat with the heat dissipation end 52b of the semiconductor heat sink 52, and the heat in the heat dissipation cavity 1a is discharged from the air outlet 1c; the outer sleeve 1 is provided with an air filter element 13 connected to the heat dissipation cavity 1a at the air inlet 1b, and the air filter element 13 can effectively absorb and remove moisture and dust in the air, and prevent moisture and dust from entering the heat dissipation cavity 1a from the air inlet 1b, thereby improving the waterproof sealing of the utility model; the outer sleeve 1 is provided with a filter cover 14 connected to the heat dissipation cavity 1a at the air outlet 1c, and the addition of the filter cover 14 can prevent dust or insects from entering the heat dissipation cavity 1a from the air outlet 1c.

[0036] like Figure 5As shown, the first reduction mechanism includes a driving helical gear 81, a helical inner gear ring 82 and a plurality of helical planetary gears 83. The driving helical gear 81 is coaxially fixed with the first output end of the dual-axis brushless motor 11. The driving helical gear 81 is transmission-connected with the helical inner gear ring 82 through a plurality of helical planetary gears 83. The helical inner gear ring 82 is fixedly connected with a connecting seat 84. The connecting seat 84 is transmission-connected with the screw 4 through a clutch structure 9. The dual-axis brushless motor 11 rotates to drive the driving helical gear 81 to rotate. The driving helical gear 81 drives the helical inner gear ring 82 and the connecting seat 84 to rotate synchronously through the helical planetary gears 83. Then the connecting seat 84 drives the screw 4 to rotate through the clutch structure 9. Finally, by utilizing the threaded fit between the screw 4 and the internal threaded sleeve 31 and the sliding fit between the ejector sleeve 3 and the inner sleeve 2, the ejector sleeve 3 can be ejected outward relative to the outer sleeve 1 to realize the opening of the tailgate of the automobile. Clutch structure 9 includes a clutch plate 92, a friction plate 91 and a spring 93. The clutch plate 92 is connected to the connecting seat 84 for preventing rotation, and the friction plate 91 is connected to the screw rod 4 for preventing rotation. The clutch plate 92 and the friction plate 91 are frictionally matched, and the spring 93 always has a movement tendency to press the clutch plate 92 and the friction plate 91 against each other. The spring 93 presses the clutch plate 92 and the friction plate 91 against each other, so that a friction pressing force is generated between the clutch plate 92 and the friction plate 91. When the connecting seat 84 rotates, the static friction force between the clutch plate 92 and the friction plate 91 drives the screw rod 4 to rotate, thereby driving the ejection sleeve 3 to extend outward relative to the outer sleeve 1. When the ejection sleeve 3 is subjected to a large compressive stress, and the compressive stress is greater than the friction pressing force between the clutch plate 92 and the friction plate 91, the ejection sleeve 3 retracts into the outer sleeve 1. In view of the situation that the tailgate of the automobile is subjected to a large upper pressure, the electric support rod can be effectively prevented from breaking.

[0037] like Figure 3-4As shown, the second reduction mechanism includes a driving gear 71, a first transmission gear 72, a first rotating shaft 73, and a second transmission gear 731 and a first bevel gear 732 fixed at both ends of the first rotating shaft 73. The driving gear 71 is coaxially fixed to the second output end of the dual-axis brushless motor 11. The two ends of the first transmission gear 72 are respectively meshed with the driving gear 71 and the second transmission gear 731. The wind wheel assembly 12 includes a second rotating shaft 120 rotatably arranged in the outer sleeve 1, a fan blade 121 fixed at both ends of the second rotating shaft 120, and a second bevel gear 122. The first bevel gear 732 is meshed with the second bevel gear 122. The dual-axis brushless The brush motor 11 drives the driving gear 71 to rotate, and the driving tooth path drives the second driving gear 731 to rotate through the first transmission gear 72, and the second transmission gear 731 drives the first bevel gear 732 to rotate through the first rotating shaft 73, and finally, through the meshing action of the first bevel gear 732 and the second bevel gear 122, the fan blade 121 is driven to rotate through the second rotating shaft 120, and the wind pressure formed by the fan blade 121 in the heat dissipation chamber 1a is used to discharge the heat generated in the heat dissipation chamber 1a from the air outlet 1c; the sealing box 5 is provided with a through hole 5a corresponding to the first rotating shaft 73, and a connecting pipe 53 is fixed in the sealing box 5, and the connecting pipe 53 has two The first end of the first rotating shaft 73 is connected with the corresponding through hole 5a, and the first rotating shaft 73 is movably arranged in the connecting tube 53. The connecting tube 53 is used to isolate the space where the first rotating shaft 73 is located from the space where the ECU control board 51 in the sealing box 5 is located, which can effectively prevent water vapor from entering the sealing box 5 and causing the ECU control board 51 to short-circuit; the two ends of the first rotating shaft 73 are rotatably connected to the connecting tube 53 through bearings 54. The addition of bearings 54 can improve the smoothness of the rotation of the first rotating shaft 73 in the connecting tube 53 and prevent the first rotating shaft 73 from getting stuck when rotating; a waterproof sealing structure is provided between the first rotating shaft 73 and the through hole 5a of the sealing box 5. The shaft 73 is sealed and rotated with the sealing box 5 through a waterproof sealing structure. The waterproof sealing structure can improve the sealing performance between the first rotating shaft 73 and the connecting pipe 53, and effectively prevent water vapor from entering the space where the dual-axis brushless motor 11 is located through the connecting pipe 53, causing the dual-axis brushless motor 11 to short-circuit; the waterproof sealing structure includes two waterproof sealing rings 55, and the two waterproof sealing rings 55 are sleeved on the outside of the first rotating shaft 73 and placed in the through hole 5a. The first rotating shaft 73 is sealed with the sealing box 5 through the waterproof sealing ring 55. Multiple waterproof sealing rings 55 cooperate to improve the waterproof sealing degree between the first rotating shaft 73 and the inner wall of the connecting pipe 53.

[0038] The basic working principle of the utility model is as follows: the ECU control board 51 controls the dual-axis brushless motor 11 to run and rotate, the first output end of the dual-axis brushless motor 11 drives the screw 4 to rotate through the first reduction mechanism, and the threaded fit between the screw 4 and the internal threaded sleeve 31 and the sliding fit between the ejector sleeve 3 and the internal sleeve 2 are utilized so that the internal threaded sleeve 31 pushes the ejector sleeve 3 to extend out of the external sleeve 1 to realize the opening of the tailgate of the automobile. In this process, the heat generated by the ECU control board 51 is absorbed by the heat absorption end 52a of the semiconductor heat sink 52 and transferred to the heat dissipation end 52b, and the second output end of the dual-axis brushless motor 11 drives the screw 4 through the second reduction mechanism. The wind wheel assembly 12 is rotated to draw cooler air into the heat dissipation cavity 1a and exchange heat with the heat dissipation end 52b of the semiconductor heat dissipation element 52, and finally the heat in the heat dissipation cavity 1a is discharged from the air outlet 1c, which can effectively prevent the ECU control board 51 from being damaged due to overheating and slow down the aging of electrical components. The utility model adopts a dual-axis brushless motor 11 to provide driving force for the ejection sleeve 3 and the wind wheel assembly 12 at the same time. There is no need to set an additional drive unit for the wind wheel assembly 12, which reduces the space occupied by the drive unit and has the effects of compact structure, good heat dissipation performance and extended service life of the electric support rod.

[0039] The above description is only a preferred embodiment of the present utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the scope of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. An ECU built-in brushless electric strut, comprising an outer sleeve (1) and an inner sleeve (2), characterized in that: A dual-axis brushless motor (11) is arranged inside the outer sleeve (1), an ejector sleeve (3) is slidably arranged inside the inner sleeve (2), an internal thread sleeve (31) is fixedly arranged inside the ejector sleeve (3), a screw rod (4) is threadedly connected to the internal thread sleeve (31), the screw rod (4) is threadedly matched with the ejector sleeve (3) through the internal thread sleeve (31), and one end of the screw rod (4) is transmission-connected to the first output end of the dual-axis brushless motor (11) through a first reduction mechanism; The outer sleeve (1) is provided with a sealing box (5) and an end cover (6) at one end away from the screw rod (4); the sealing box (5) has an ECU control board (51) built therein; the outer sleeve (1) forms a heat dissipation cavity (1a) between the end cover (6) and the sealing box (5); a wind wheel assembly (12) is rotatably arranged in the heat dissipation cavity (1a); the side wall of the outer sleeve (1) is provided with an air inlet (1b) and an air outlet (1c) connected to the heat dissipation cavity (1a); a semiconductor heat dissipation element (52) is embedded in the sealing box (5); The heat absorbing end (52a) of the conductor heat sink (52) is attached to the ECU control board (51), and the heat dissipating end (52b) of the semiconductor heat sink (52) is placed in the heat dissipating cavity (1a). The second output end of the dual-axis brushless motor (11) drives the wind wheel assembly (12) to rotate through a second reduction mechanism, and drives air to be drawn into the heat dissipating cavity (1a) from the air inlet (1b) to exchange heat with the heat dissipating end (52b) of the semiconductor heat sink (52), and discharges the heat in the heat dissipating cavity (1a) from the air outlet (1c).

2. The ECU built-in brushless electric strut according to claim 1, characterized in that: The second reduction mechanism comprises a driving gear (71), a first transmission gear (72), a first rotating shaft (73), and a second transmission gear (731) and a first bevel gear (732) fixedly arranged at two ends of the first rotating shaft (73); the driving gear (71) is coaxially fixedly arranged at the second output end of the dual-axis brushless motor (11); two ends of the first transmission gear (72) are respectively meshed with the driving gear (71) and the second transmission gear (731); the wind wheel assembly (12) comprises a second rotating shaft (120) rotatably arranged in the outer sleeve (1), a fan blade (121) fixedly arranged at two ends of the second rotating shaft (120), and a second bevel gear (122); the first bevel gear (732) is meshed with the second bevel gear (122).

3. The ECU built-in brushless electric strut according to claim 2, characterized in that: The sealing box (5) is provided with a through hole (5a) corresponding to the first rotating shaft (73), a connecting tube (53) is fixedly provided in the sealing box (5), two ends of the connecting tube (53) are connected with the corresponding through hole (5a), and the first rotating shaft (73) is movably arranged in the connecting tube (53).

4. The ECU built-in brushless electric strut according to claim 3, characterized in that: Both ends of the first rotating shaft (73) are rotatably connected to the connecting pipe (53) via bearings (54).

5. The ECU built-in brushless electric strut according to claim 3, characterized in that: A waterproof sealing structure is provided between the first rotating shaft (73) and the through hole (5a) of the sealing box (5), and the first rotating shaft (73) is sealed and rotatably matched with the sealing box (5) through the waterproof sealing structure.

6. The ECU built-in brushless electric strut according to claim 5, characterized in that: The waterproof sealing structure comprises two waterproof sealing rings (55), the two waterproof sealing rings (55) are sleeved outside the first rotating shaft (73) and placed in the through hole (5a), and the first rotating shaft (73) is sealed and matched with the sealing box (5) through the waterproof sealing rings (55).

7. The ECU built-in brushless electric strut according to claim 1, characterized in that: The outer sleeve (1) is provided with an air filter element (13) at the air inlet (1b) and is in communication with the heat dissipation cavity (1a).

8. The ECU built-in brushless electric strut according to claim 1, characterized in that: The outer sleeve (1) is provided with a filter cover (14) at the air outlet (1c) and is connected to the heat dissipation cavity (1a).

9. The ECU built-in brushless electric strut according to claim 1, characterized in that: The first reduction mechanism comprises a driving helical gear (81), a helical internal gear ring (82) and a plurality of helical planetary gears (83); the driving helical gear (81) is coaxially fixedly provided with a first output end of the dual-axis brushless motor (11); the driving helical gear (81) is transmission-connected to the helical internal gear ring (82) via a plurality of helical planetary gears (83); the helical internal gear ring (82) is fixedly connected to a connecting seat (84); and the connecting seat (84) is transmission-connected to the screw (4) via a clutch structure (9).

10. The ECU built-in brushless electric strut according to claim 9, characterized in that: The clutch structure (9) comprises a clutch plate (92), a friction plate (91) and a spring (93); the clutch plate (92) is connected to the connecting seat (84) in a rotationally fixed manner; the friction plate (91) is connected to the screw rod (4) in a rotationally fixed manner; the clutch plate (92) and the friction plate (91) are frictionally matched; and the spring (93) always has a movement tendency to press the clutch plate (92) and the friction plate (91) against each other.

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