Brushless electric supporting rod stable in operation

Abstract

The utility model discloses a brushless electric support rod stable in operation, which comprises an outer sleeve, an inner shell arranged on the inner wall of the outer sleeve, and a transmission area defined in the inner shell, a motor, a gear box and a damper which are axially and sequentially jointed are arranged in the transmission area, a first sealing piece is arranged between the motor and the gear box, and a second sealing piece is arranged between the gear box and the damper. The first sealing piece comprises a first pressing edge axially connected between the motor and the end face of the gear box in an abutting mode, the first pressing edge extends towards the central axis to be provided with a connecting body embedded in the gear box, and the connecting body is fixedly connected with the end face of the motor and embraces the periphery of the output end of the motor. A second sealing element is arranged between the damper and the gear box, and is provided with an L-shaped main body which is radially extruded between the opposite walls of the inner shell and the gear box and axially extruded between the end surface of the damper and the end surface of the gear box; the peripheries of the damper, the L-shaped body and the gear box are provided with a plurality of positioning components which are sequentially and oppositely arranged, and the multiple positioning components are connected and abut against one another in the axial direction.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, in particular to a brushless electric strut with stable operation. Background Art

[0002] At present, an electric strut for a rear tailgate of a car in the prior art includes a motor, a gearbox arranged on the output end of the motor, a damper engaged on the gearbox, and a screw module in its transmission area. The screw module includes a screw having an output end engaged with the damper and the gearbox, and a nut sleeve on the screw connected to a sleeve, thereby finally realizing the extension and movement of the sleeve. Since the above-mentioned transmission components are all engaged front and rear in sequence with respect to the axial direction, and the working condition that the electric strut opens the tailgate requires, the electric strut has a certain axial length. However, this arrangement method inevitably causes abnormal noise in the transmission process of the electric strut. The screw module has higher stability due to the guide spring supporting the sleeve on its outer side. The source of the abnormal noise is mainly between the gearbox and the motor, and between the gearbox and the damper. The gearbox, the motor and the damper in the prior art are only connected by a simple shock-absorbing flat pad, which has a poor effect on suppressing the vibration and abnormal noise during operation. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a brushless electric strut with stable operation.

[0004] The above technical objectives of the utility model are achieved through the following technical solutions: a brushless electric strut with stable operation, comprising an outer sleeve, an inner shell arranged on the inner wall of the outer sleeve, and a transmission area defined in the inner shell, wherein a motor, a gear box and a damper are arranged in the transmission area and are axially connected in sequence, wherein the motor specifically refers to a brushless motor;

[0005] A first seal is provided between the motor and the gearbox, the first seal comprises a first pressing edge axially abutting between the motor and the end face of the gearbox, the first pressing edge extends toward the central axis and is provided with a connecting body embedded in the gearbox, the connecting body is fixedly connected to the end face of the motor and is engaged with the outer periphery of the output end of the motor;

[0006] A second seal is provided between the damper and the gearbox, and the second seal has an L-shaped body which is radially squeezed between the opposite walls of the inner housing and the gearbox and axially squeezed between the end face of the damper and the end face of the gearbox, and the outer periphery of the damper, the L-shaped body and the gearbox is provided with a plurality of positioning members which are arranged opposite to each other in sequence, and the plurality of positioning members are engaged and pressed against each other in the axial direction.

[0007] Furthermore, the inner surface of the gearbox is provided with a plurality of first positioning protrusions extending axially, the end surface of the connecting body is provided with a first positioning recess, and the first positioning protrusion and the first positioning recess are correspondingly arranged at the connecting position between the connecting body and the end surface of the motor.

[0008] Furthermore, a positioning ring is provided at the center of the connecting body, and a plurality of embracing arms are provided at intervals on the circumference of the positioning ring. The inner diameter enclosed by the embracing arms is smaller than the outer diameter of the motor end, and an avoidance gap is provided in the positioning ring for radial expansion of the embracing arms.

[0009] Furthermore, sound absorbing grooves are provided at both axial end surfaces of the connecting body, and the cross-section of the sound absorbing grooves is expanded toward the motor end surface so that the two side walls of the sound absorbing grooves are kept at least partially deformed and pressed against the motor end surface.

[0010] Furthermore, a first limiting recess is provided on the end face of the gear box, a first limiting protrusion is provided on the end face of the L-shaped body, a second limiting recess is provided on the L-shaped body corresponding to the first limiting protrusion, a second limiting protrusion extends from the end of the damper, the first limiting protrusion is inserted into the first limiting recess, the second limiting protrusion is embedded in the second limiting recess, and is pressed against the first limiting protrusion and the first limiting recess.

[0011] Furthermore, the open end of the damper is also provided with a flare that expands outward, the end of the gear box is provided with a rib extending on the side with the smallest diameter of the flare, the L-shaped body has a first extrusion protrusion extending axially, the first extrusion protrusion has a hypotenuse with a slope smaller than that of the flare, the first extrusion protrusion is squeezed with the flared shaft end and tightly matched with the hypotenuse through deformation.

[0012] Furthermore, a first gap is reserved at the inner end of the expansion opening for being filled by the deformed portion of the first extrusion protrusion.

[0013] Furthermore, the gear box is further provided with a retaining groove on the radial outer side of the rib, and the L-shaped body is provided with a second extrusion protrusion extending toward the retaining groove, and the retaining groove matches the profile of the second extrusion protrusion.

[0014] Furthermore, a second gap is reserved at the inner end of the retaining groove for being filled by the deformed portion of the second extrusion protrusion.

[0015] Furthermore, the retaining groove and the second extrusion protrusion have an oblique guide section and a straight section extending sequentially in the axial direction, and the oblique guide section on the L-shaped body extends outside the retaining groove and is deformed toward the end face of the gear box through the extrusion of the damper.

[0016] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0017] The utility model provides a first seal between the gear box and the motor, and a second seal between the gear box and the damper. The first seal is partially placed in the gear box and connected to the motor end face by bolts. At the same time, the first seal is also tightly held at the end of the motor. Under the locking force of the bolt connection and the abutment of the gear box, the first seal can be axially squeezed and deformed, thereby effectively compensating for the gap between the gear box and the motor end face; and the L-shaped body on the second seal can be squeezed between the damper and the gear box end in the axial direction, and squeezed between the inner housing and the outer wall of the gear box in the radial direction. In addition, a plurality of positioning components further improve the alignment stability between the second seal, the gear box and the damper, and the reliability of the fit;

[0018] The L-shaped body in the second seal also has a first extrusion protrusion and a second extrusion protrusion extending axially, and corresponding retaining grooves and flares are provided between the opposite end faces of the damper and the gear box. During the assembly process, the two extrusion protrusions can be squeezed and deformed to produce radial and axial components, thereby compensating and filling the gaps in the flares and retaining grooves, ensuring that the gear box and the damper remain in a stable working state, effectively reducing working noise and jitter in the transmission area. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic cross-sectional view of the utility model;

[0020] Figure 2 for Figure 1 Enlarged view of point A in the middle; (the dotted lines in the figure are the wall surfaces of the expansion and retaining groove)

[0021] Figure 3 It is a structural schematic diagram of the transmission area of ​​the utility model;

[0022] Figure 4 for Figure 3 The enlarged view of point B in the middle;

[0023] Figure 5 for Figure 3 Enlarged view of point C in the middle;

[0024] Figure 6 It is a structural schematic diagram of the motor and the first sealing member of the utility model;

[0025] Figure 7 It is an exploded schematic diagram of the motor and the first sealing member of the utility model;

[0026] In the figure:

[0027] 1. Outer sleeve; 2. Inner housing; 2.1. Transmission area; 3. Motor; 3.1. Motor end; 4. Gear box; 4.1. First positioning convex portion; 4.2. First limiting concave portion; 4.3. Retaining edge; 4.4. Retaining groove; 4.5. Second gap; 5. Damper; 5.1. Second limiting convex portion; 5.2. Expanding; 5.3. First gap; 5.4. Bevel edge; 5.5. Arc segment; 6. First sealing member; 6 .1, first pressing edge; 6.2, connecting body; 6.3, first positioning recess; 6.4, positioning ring; 6.5, embracing arm; 6.6, avoidance gap; 6.7, sound absorbing groove; 7, second sealing member; 7.1, L-shaped body; 7.2, first limiting convex part; 7.3, second limiting concave part; 7.4, first extrusion convex part; 7.5, second extrusion convex part; 7.51, oblique guide section; 7.52, straight section; 8, bolt; DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be understood that although the terms upper, middle, lower, top, end, etc. appear in this article to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish elements from each other for easy understanding, and are not used to define any direction or order limitation.

[0030] like Figure 1-7 As shown, a brushless electric strut with stable operation comprises an outer sleeve 1, an inner shell 2 arranged on the inner wall of the outer sleeve 1, and a transmission area 2.1 defined in the inner shell 2, wherein the transmission area 2.1 is provided with a motor 3, a gear box 4 and a damper 5 which are axially connected in sequence.

[0031] like Figure 5As shown, a first seal 6 is provided between the motor 3 and the gearbox 4, and the first seal 6 includes a first pressure edge 6.1 axially abutting between the end faces of the motor 3 and the gearbox 4, and the first pressure edge 6.1 extends toward the central axis and is provided with a connecting body 6.2 embedded in the gearbox 4, and the connecting body 6.2 is fixedly connected to the end face of the motor 3 and is engaged with the outer periphery of the output end of the motor 3, and the end of the motor 3 refers to a step protruding from the end face of the motor 3, and a bearing is provided inside the step, wherein the connecting body 6.2 is fixedly connected to the end face of the motor 3 by a plurality of bolts 8 surrounding the circumference of the central axis, and is locked by the bolts 8. The tightening force and the interaction force between the gear box 4 and the motor 3 realize the axial compression of the first seal 6 and force the first seal 6 to deform in the axial direction. In addition, the axial end face of the connecting body 6.2 is also arranged with a plurality of groove parts, the side walls of which are radially expanded by the axial deformation and closely abutted between the gear box 4 and the end face of the motor 3. At this time, the part of the connecting body 6.2 that is engaged with the output end of the motor 3 is further applied with a radial clamping force, thereby stabilizing the axial relative position between the motor 3 and the gear box 4 when the electric support rod is assembled and in working state, and suppressing the shaking between the two.

[0032] like Figure 2 As shown, a second seal 7 is provided between the damper 5 and the gearbox 4. The second seal 7 has an L-shaped body 7.1 which is radially squeezed between the opposite walls of the inner housing 2 and the gearbox 4 and axially squeezed between the end face of the damper 5 and the end face of the gearbox 4. The assembly gap among the damper 5, the L-shaped body 7.1 and the gearbox 4 is effectively compensated by the L-shaped body 7.1. Furthermore, the outer peripheries of the damper 5, the L-shaped body 7.1 and the gearbox 4 are provided with a plurality of positioning members which are arranged in sequence and are intended to realize the assembly positioning of the three and to apply directional pressure to the second seal 7 in the assembled state. In addition, the plurality of positioning members are mutually engaged and pressed in the axial direction, thereby improving the mutual squeezing and positioning effect of the concave and convex positioning members among the damper 5, the L-shaped body 7.1 and the gearbox 4.

[0033] like Figure 6 and Figure 7 As shown, as a further implementation of the first seal 6, in order to realize the mutual positioning of the gear box 4 and the first seal 6, a plurality of first positioning protrusions 4.1 extending axially are provided on the inner surface of the gear box 4, and a first positioning recess 6.3 is provided on the end face of the connecting body 6.2. The first positioning protrusion 4.1 and the first positioning recess 6.3 match each other, and the first positioning protrusion 4.1 and the first positioning recess 6.3 are correspondingly arranged at the connecting position between the connecting body 6.2 and the end face of the motor 3, thereby positioning the gear box 4 and the first seal 6 in the axial and circumferential directions, limiting the rotation between the two, and further increasing the effective area of ​​the gear box 4 on the first seal 6.

[0034] As a further explanation of the connection body 6.2 embracing the end of the motor 3, a positioning ring 6.4 is provided at the center of the connection body 6.2, and the end of the motor 3 is placed in the positioning ring 6.4, so as to position the first seal 6 and the motor 3, and the gear box 4 and the first seal 6 are positioned on the peripheral side of the contour, and the end of the motor 3 and the first seal 6 are positioned on the central axis, and bolts 8 are provided between the positioning position of the gear box 4 and the first seal 6 and the positioning position of the motor 3 and the first seal 6 for fastening, so as to achieve the relative position stability between the gear box 4, the first seal 6 and the motor 3, and the tightening force of the bolt 8 on the positioning position of the gear box 4 and the first seal 6, and the deformation force between the motor 3 and the first seal 6.

[0035] Furthermore, a plurality of engaging arms 6.5 are provided at intervals on the circumferential side of the positioning ring 6.4, and a radially extending convex portion is provided at the end of the engaging arms 6.5. The inner diameter enclosed by the engaging arms 6.5 is smaller than the outer diameter of the end of the motor 3, so that when the first seal 6 and the motor 3 are in place, the plurality of engaging arms 6.5 are squeezed to expand radially outward, and the retaining force of the engaging arms 6.5 tightly holds the end of the motor 3. In addition, an avoidance gap 6.6 is provided in the positioning ring 6.4 for radial expansion of the engaging arms 6.5. The avoidance gap 6.6 allows the first seal 6 to be conveniently assembled on the motor 3, reducing the amount of interference before the bolts 8 are tightened.

[0036] Specifically, sound absorbing grooves 6.7 are provided on both axial end faces of the connecting body 6.2, and the cross-section of the sound absorbing groove 6.7 is expanded toward the end face of the motor 3. When the first sealing member 6 is locked to the end face of the motor 3 by bolts 8, the two side walls of the sound absorbing groove 6.7 are kept at least partially deformed and pressed against the end face of the motor 3, and the radial inner side wall of the sound absorbing groove 6.7 is formed on the back of the embracing arm 6.5, so that the passive deformation of the sound absorbing groove 6.7 can also force the embracing arm 6.5 to be further acted on the end of the motor 3.

[0037] like Figure 4As shown, as a further implementation method for the cooperation between the second sealing member 7 and the gear box 4, a first limiting recess 4.2 is provided on the end face of the gear box 4, a first limiting protrusion 7.2 is provided on the end face of the L-shaped body 7.1, and a second limiting recess 7.3 is further provided on the L-shaped body 7.1 corresponding to the first limiting protrusion 7.2, and a second limiting protrusion 5.1 extends from the end of the damper 5, the first limiting protrusion 7.2 is inserted into the first limiting recess 4.2, and the second limiting protrusion 5.1 is embedded in the second limiting recess 7.3 and pressed against the first limiting protrusion 7.2 and the first limiting recess 4.2. Through the above improvements, the relative rotation between the damper 5, the second sealing member 7 and the gear box 4 is prevented, and through the abutment and cooperation between the above-mentioned limiting recess and the limiting protrusion, the deformation effect of the first sealing member 6 between the gear box 4 and the damper 5 is optimized.

[0038] like Figure 2 As shown, specifically, the open end of the damper 5 is also provided with a flare 5.2 that expands outward, the end of the gear box 4 is provided with a flange 4.3 extending on the smallest side of the flare 5.2, the L-shaped body 7.1 has an axially extending first extrusion convex portion 7.4, the first extrusion convex portion 7.4 has a bevel 5.4 with a slope greater than the flare 5.2, the first extrusion convex portion 7.4 is extruded with the axial end of the flare 5.2 and is tightly matched with the bevel 5.4 through deformation, the inner surface of the first extrusion convex portion 7.4 is aligned with the flange 4.3, in the assembled state, the first extrusion convex portion 7.4 is axially acted between the gear box 4 and the damper 5, and the first extrusion convex portion 7.4 is against the inclined surface of the flare 5.2, thereby forcing the first extrusion convex portion 7.4 to deform in the axial direction to fill the inner end of the flare, and deform in the radial direction and abut against the flange 4.3.

[0039] Among them, the first extrusion protrusion 7.4 is specifically formed on the end face of the L-shaped body 7.1 corresponding to the damper 5 and the gear box 4, and the root of the first extrusion protrusion 7.4 is connected to the outer surface of the L-shaped body 7.1, thereby improving the close fit between the end faces of the damper 5 and the gear box 4.

[0040] Preferably, the flare 5.2 and the first extrusion protrusion 7.4 both include an arc segment 5.5 with a consistent contour and the above-mentioned hypotenuse 5.4 with different slopes. The first extrusion protrusion 7.4 and the flare 5.2 are guided by the arc segment 5.5. Before the first extrusion protrusion 7.4 and the flare 5.2 produce an extrusion effect, the arc segment 5.5 determines the matching position between the two, which is conducive to guiding the deformation of the first extrusion protrusion 7.4 in the flare 5.2.

[0041] Specifically, a first gap 5.3 is reserved at the inner end of the flare 5.2 for being partially filled with the deformed portion of the first extrusion protrusion 7.4. In the assembled state, the first extrusion protrusion 7.4 is axially extruded, and its radial deformation is blocked by the retaining edge 4.3, thereby filling the first gap 5.3 through its axial deformation component.

[0042] As a further implementation of the cooperation between the second seal 7 and the gear box 4, the gear box 4 is further provided with a retaining groove 4.4 on the radial outside of the rib 4.3, and the L-shaped body 7.1 is provided with a second extrusion protrusion 7.5 extending toward the retaining groove 4.4. The retaining groove 4.4 matches the profile of the second extrusion protrusion 7.5, and the second extrusion protrusion 7.5 extends relative to the first extrusion protrusion 7.4. The second seal 7 is fully cooperated with the gear box 4 through the retaining groove 4.4, thereby improving the tightness of the cooperation between the second seal 7 and the gear box 4.

[0043] Specifically, a second gap 4.5 is reserved at the inner end of the retaining groove 4.4 for being partially filled with the deformed portion of the second extrusion protrusion 7.5. In the assembled state, the second seal 7 is axially pressed between the gear box 4 and the damper 5, and the second extrusion protrusion 7.5 is then filled in the retaining groove 4.4. At the same time, under the deformation action of the first extrusion protrusion 7.4, its deformation component can be partially guided into the second extrusion protrusion 7.5, thereby filling the second gap 4.5.

[0044] Furthermore, the retaining groove 4.4 and the second extrusion protrusion 7.5 have an oblique guide section 7.51 and a straight section 7.52 extending sequentially in the axial direction. The oblique guide section 7.51 on the L-shaped body 7.1 extends outside the retaining groove 4.4 and is deformed toward the end face of the gear box 4 by the extrusion of the damper 5. The assembly of the retaining groove 4.4 and the second extrusion protrusion 7.5 is guided by the straight section 7.52, and the oblique guide section 7.51 extending outside the second extrusion protrusion 7.5 abuts against the end of the gear box 4, thereby forcing the second extrusion protrusion 7.5 in the retaining groove 4.4 to deform, thereby further filling the second gap 4.5.

[0045] Preferably, the slope of the inclined guide section 7.51 on the second extrusion protrusion 7.5 is greater than that of the inclined guide section 7.51 on the gear box 4, so that the inclined guide section 7.51 on the second extrusion protrusion 7.5 is squeezed and deformed, thereby filling the gap between the second seal 7 and the gear box 4.

[0046] By corresponding to the first gap 5.3 and the second gap 4.5 between the first extrusion protrusion 7.4 and the second extrusion protrusion 7.5, for the convenience of observation, Figure 2The middle part is the shape of the second seal before deformation, so that the second seal 7 is fully squeezed in the axial direction and deformed between the damper 5 and the gear box 4. At the same time, the second seal 7 is forced to produce a deformation component in the radial direction through the inclined surface on the first extrusion protrusion 7.4 and the inclined guide section 7.51 on the second extrusion protrusion 7.5, so that the second seal 7 can reliably abut against the outer end surface of the flared opening 5.2 and the retaining groove 4.4, as well as the flange 4.3 of the gear box 4. In addition, the L-shaped body 7.1 between the inner housing 2 and the end surface of the damper 5 and the gear box 4 can also be further tightly fitted under the extrusion deformation of the first extrusion protrusion 7.4 and the second extrusion protrusion 7.5.

[0047] In the above embodiment, the clearance between the damper 5, the gearbox 4 and the motor 3 is fully compensated and cancelled by the axial and radial deformation components of the first seal 6 and the second seal 7, thereby suppressing the vibration and clearance inside the transmission area 2.1.

[0048] In other embodiments, the damper 5 includes a plurality of gaskets providing friction, springs abutting against the gaskets, and nuts screwed into the damper 5, the nuts press against the springs, and the gaskets are connected to the ends of the screws in the screw assembly of the electric support rod, and the ribs 4.3 extend toward the back of the nut to ensure that the nut is screwed into place and to prevent the nut from returning to its original position in the assembled state.

[0049] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A brushless electric strut with stable operation, characterized in that: The invention comprises an outer sleeve (1), an inner shell (2) arranged on the inner wall of the outer sleeve (1), and a transmission area (2.1) defined in the inner shell (2), wherein a motor (3), a gear box (4) and a damper (5) are arranged in the transmission area (2.1) and are axially connected in sequence. A first sealing member (6) is provided between the motor (3) and the gear box (4), the first sealing member (6) comprising a first pressing edge (6.1) axially abutting between the end faces of the motor (3) and the gear box (4), the first pressing edge (6.1) extending toward the central axis and having a connecting body (6.2) embedded in the gear box (4), the connecting body (6.2) being fixedly connected to the end face of the motor (3) and embracing the outer periphery of the output end of the motor (3); A second sealing member (7) is provided between the damper (5) and the gearbox (4), the second sealing member (7) having an L-shaped main body (7.1) which is radially squeezed between the opposite walls of the inner housing (2) and the gearbox (4), and axially squeezed between the end face of the damper (5) and the end face of the gearbox (4), and a plurality of positioning members which are arranged in sequence and relatively to each other are provided on the outer periphery of the damper (5), the L-shaped main body (7.1) and the gearbox (4), and the plurality of positioning members are mutually engaged and pressed in the axial direction.

2. A brushless electric strut with stable operation as claimed in claim 1, characterized in that: The inner surface of the gear box (4) is provided with a plurality of first positioning protrusions (4.1) extending axially, the end surface of the connecting body (6.2) is provided with a first positioning recess (6.3), and the first positioning protrusions (4.1) and the first positioning recess (6.3) are correspondingly arranged at the connection position between the connecting body (6.2) and the end surface of the motor (3).

3. A brushless electric strut with stable operation as claimed in claim 1, characterized in that: A positioning ring (6.4) is provided at the center of the connecting body (6.2), and a plurality of spaced-apart embracing arms (6.5) are provided around the positioning ring (6.4); the inner diameter formed by the embracing arms (6.5) is smaller than the outer diameter of the end of the motor (3), and an escape gap (6.6) is provided in the positioning ring (6.4) for radial expansion of the embracing arms (6.5).

4. A brushless electric strut with stable operation as claimed in claim 1, characterized in that: The two axial end faces of the connecting body (6.2) are provided with sound absorbing grooves (6.7), and the cross section of the sound absorbing groove (6.7) is expanded toward the end face of the motor (3), so that the two side walls of the sound absorbing groove (6.7) are kept at least partially deformed and pressed against the end face of the motor (3).

5. A brushless electric strut with stable operation as claimed in claim 1, characterized in that: The gear box (4) is provided with a first limiting recess (4.2) on the end surface, the L-shaped body (7.1) is provided with a first limiting protrusion (7.2) on the end surface, the L-shaped body (7.1) is further provided with a second limiting recess (7.3) corresponding to the first limiting protrusion (7.2), the damper (5) is provided with a second limiting protrusion (5.1) extending from the end, the first limiting protrusion (7.2) is inserted into the first limiting concave (4.2), the second limiting protrusion (5.1) is embedded in the second limiting concave (7.3) and pressed against the first limiting protrusion (7.2) and the first limiting concave (4.2).

6. A brushless electric strut with stable operation as claimed in claim 1, characterized in that: The open end of the damper (5) is also provided with a flare (5.2) expanding outwards, the end of the gearbox (4) is provided with a rib (4.3) extending on the smallest diameter side of the flare (5.2), the L-shaped body (7.1) has a first extrusion convex portion (7.4) extending axially, the first extrusion convex portion (7.4) having a bevel (5.4) with a smaller slope than the flare (5.2), the first extrusion convex portion (7.4) is extruded with the axial end of the flare (5.2) and is tightly matched with the bevel (5.4) through deformation.

7. A brushless electric strut with stable operation as claimed in claim 6, characterized in that: A first gap (5.3) is reserved at the inner end of the flared opening (5.2) for being filled by the deformed portion of the first extrusion convex portion (7.4).

8. A brushless electric strut with stable operation as claimed in claim 6, characterized in that: The gear box (4) is further provided with a retaining groove (4.4) on the radial outer side of the retaining edge (4.3), and the L-shaped body (7.1) is provided with a second extrusion convex portion (7.5) extending toward the retaining groove (4.4), and the retaining groove (4.4) matches a partial profile of the second extrusion convex portion (7.5).

9. A brushless electric strut with stable operation as claimed in claim 8, characterized in that: A second gap (4.5) is reserved at the inner end of the retaining groove (4.4) for being filled by the deformed portion of the second extrusion convex portion (7.5).

10. A brushless electric strut with stable operation as claimed in claim 8, characterized in that: The retaining groove (4.4) and the second extrusion protrusion (7.5) have an oblique guide section (7.51) and a straight section (7.52) extending in sequence in the axial direction; the oblique guide section (7.51) on the L-shaped body (7.1) extends outside the retaining groove (4.4) and is deformed toward the end face of the gear box (4) through the extrusion of the damper (5).

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