A worm gear fixing structure for a vehicle door drive

Abstract

The utility model discloses a worm wheel fixing structure for vehicle door driver, include: casing, connect to the motor of casing and be located in the transmission assembly of casing, be equipped with the transmission cavity of containing transmission assembly in the casing, transmission assembly includes the worm wheel of inlay in transmission cavity, the first bearing of setting in the worm wheel and the pre -tightening assembly of constraint in the outer ring of first bearing, worm wheel inner wall is connected with the screw rod thread, worm wheel receives motor driving force and transmits the torque, the bearing outer ring of first bearing is tight in transmission cavity inner wall, the bearing inner ring of first bearing is fixed and abuts on the worm wheel, pre -tightening assembly includes the first fastener of thread connection in the open side of transmission cavity and the second fastener of fixed on the worm wheel, bearing outer ring is axially close to between transmission cavity inner wall and first fastener, bearing inner ring is close to the radial protruding portion on the second fastener and worm wheel.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to a worm gear fixing structure for a car door actuator. Background Technology

[0002] Currently, door actuators are tools used to achieve automatic opening and closing of car doors. They typically include a worm gear structure driven by a motor and a lead screw and nut structure. In existing technologies, the worm gear and nut are sleeved together, so that the rotation of the worm gear and nut drives the linear movement of the lead screw. The end of the lead screw is connected to a connecting bracket that is hinged to the car door or body. At this time, the linear actuation force of the lead screw can drive the car door to open or close automatically.

[0003] However, in order to ensure smooth rotation of the nut, front and rear bearings are usually installed on the nut. In the prior art, the aforementioned bearings are directly placed into the bearing seats reserved in the drive housing. However, the bearings have radial clearance during operation, especially for the bearings near the working end of the lead screw, which bear axial forces in different directions during the extension and retraction of the lead screw. The prior art lacks axial restraint for these bearings, resulting in axial movement noise when the motor drives the worm gear to rotate. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a worm gear fixing structure for a car door drive.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: A worm gear fixing structure for a vehicle door actuator includes: The housing, the motor connected to the housing, and the transmission assembly disposed within the housing, wherein the housing is provided with a transmission cavity for accommodating the transmission assembly, the transmission assembly including a worm gear placed in the transmission cavity, a first bearing sleeved on the worm gear, and a preload assembly constraining the inner and outer rings of the first bearing, the inner wall of the worm gear being threadedly connected to a lead screw, and the worm gear receiving the driving force of the motor and transmitting torque; The outer ring of the first bearing is tightly fitted to the inner wall of the transmission cavity, and the inner ring of the first bearing is fixedly abutted against the worm gear. The preload assembly includes a first fastener threaded to the opening side of the transmission cavity and a second fastener fixed to the worm gear. The outer ring of the bearing is axially abutted between the inner wall of the transmission cavity and the first fastener, and the inner ring of the bearing is abutted against the second fastener and the radial protrusion of the worm gear.

[0006] Furthermore, the worm gear is provided on the output end of the motor, and the worm wheel has a transmission part that cooperates with the worm gear and a shaft sleeve portion that extends axially relative to the transmission part. The first bearing is sleeved on the shaft sleeve portion, and the second fastener is fixed to the shaft sleeve portion.

[0007] Furthermore, the second fastener includes a support sleeve that axially abuts against the inner ring of the bearing, and a fixing ring that is welded and fixed to the shaft sleeve. The fixing ring axially abuts against the support sleeve to constrain the inner ring of the bearing.

[0008] Furthermore, the transmission part protrudes radially from the shaft cylinder and forms a first support platform that abuts against the inner ring of the bearing.

[0009] Furthermore, the shaft sleeve portion includes a first shaft sleeve and a second shaft sleeve, the bearing inner ring is sleeved on the first shaft sleeve, the first fastener is arranged on the second shaft sleeve, and the first shaft sleeve and the second shaft sleeve form a second support platform opposite to the support sleeve.

[0010] Furthermore, the first fastener is provided with an operating part for applying screwing force, and the operating part is positioned facing the opening side of the transmission cavity.

[0011] Furthermore, the transmission cavity includes a first bearing housing, and the outer ring of the bearing, at one end opposite to the first fastener, abuts against the first bearing housing.

[0012] Furthermore, the shaft sleeve portion also includes a third shaft sleeve disposed away from the first bearing, on which a second bearing is sleeved, the inner ring of the second bearing abutting against the worm gear, and the outer ring of the second bearing abutting against the inner wall of the transmission cavity.

[0013] Furthermore, the third shaft cylinder has an axial protrusion corresponding to the inner ring of the second bearing, and the transmission cavity also includes a second bearing seat that cooperates with the second bearing, with the axial protrusion and the second bearing seat being axially opposite each other.

[0014] Furthermore, a lead screw is also installed inside the transmission cavity, and the inner wall of the worm gear is threadedly connected to the lead screw, or a nut is fitted on the lead screw, and the worm gear is fixedly connected to the nut, so as to drive the lead screw to perform extension and retraction actions.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: This invention features a first bearing housed within a housing, with a first bearing seat provided for it. The inner and outer rings of the first bearing, facing away from the housing opening, are supported and abutted by a worm gear and the inner wall of the housing, respectively. The inner and outer rings of the first bearing, facing the housing opening, are axially abutted by a first fastener and a second fastener, respectively. This effectively eliminates axial movement and noise of the first bearing. The first and second fasteners are fixed to the housing and the worm gear, respectively, thereby applying axial preload to both the inner and outer rings of the first bearing simultaneously. This eliminates the axial clearance of the first bearing itself and the gaps that may occur due to bidirectional forces during operation, improving the smoothness and quietness of the automatic opening and closing process of the car door. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 For the present utility model Figure 2 Enlarged view of point A in the middle; Figure 4 This is a structural diagram of the screw and transmission assembly of this utility model. Figure 5 This is a schematic diagram of the transmission wheel of this utility model; Figure 6 This is a structural schematic diagram of the transmission wheel of this utility model from another angle; Figure 7 This is an exploded view of the transmission wheel of this utility model; In the picture: 1. Housing; 1.1. First bearing housing; 1.2. Second bearing housing; 2. Electric motor; 3. Worm gear; 3.1 Transmission unit; 3.2 Shaft sleeve section; 3.21 First shaft sleeve; 3.22 Second shaft sleeve; 3.23 Third shaft sleeve; 3.24 Axial protrusion; 3.3 First support platform; 3.4 Second support platform; 4. First bearing; 4.1 Inner ring of bearing; 4.2 Outer ring of bearing; 5. First fastener; 5.1. Operating part; 6. Second fastener; 6.1. Support sleeve; 6.2. Retaining ring; 7. Worm gear; 8. Lead screw; 9. Second bearing; Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] It should be understood that although the terms upper, middle, lower, top, one end, etc., appear in this document to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish the elements from each other for ease of understanding, and are not used to define any directional or sequential restrictions.

[0019] like Figure 1-7 As shown, a worm gear 3 fixing structure for a car door actuator includes: The housing 1, the motor 2 connected to the housing 1, and the transmission assembly disposed within the housing 1 are provided. The housing 1 is provided with a transmission cavity for accommodating the transmission assembly. The transmission assembly includes a worm gear 3 placed in the transmission cavity, a first bearing 4 sleeved on the worm gear 3, and a preload assembly constraining the inner and outer rings of the first bearing 4. The worm gear 3 receives the driving force of the motor 2 and transmits torque. An actuating member is disposed inside the housing 1. The end of the actuating member is connected to one of the car door or the car body, and the housing 1 is connected to the other of the car door or the car body to drive the car door to open or close automatically.

[0020] The first bearing 4 includes an inner bearing ring 4.1 and an outer bearing ring 4.2. The outer bearing ring 4.2 of the first bearing 4 is tightly fitted to the inner wall of the transmission cavity, and the inner bearing ring 4.1 of the first bearing 4 is fixedly abutted against the outer wall of the worm gear 3. The preload assembly includes a first fastener 5 threaded to the open side of the transmission cavity and a second fastener 6 fixed to the worm gear 3. Both the first fastener 5 and the second fastener 6 are inserted from the open side of the transmission cavity. The outer ring 4.2 of the bearing is axially pressed between the inner wall of the transmission cavity and the first fastener 5, and the inner ring 4.1 of the bearing is pressed against the second fastener 6 and the radial protrusion of the worm gear 3.

[0021] In this embodiment, the first fastener 5, which is connected by a thread, can further adjust the clamping force on the outer ring 4.2 of the bearing so that the working surfaces of the first fastener 5 and the second fastener 6 acting on the first bearing 4 are flush, thus avoiding the first bearing 4 being subjected to an offset force.

[0022] like Figure 3 and Figure 4 As shown, as a further embodiment of the transmission assembly, the transmission assembly also includes a worm 7 disposed on the output end of the motor 2. The worm 7 is engaged with the worm wheel 3. A lead screw 8 is also disposed inside the transmission cavity. The inner wall of the worm wheel 3 is threadedly connected to the lead screw 8 to drive the lead screw 8 through the opening side of the housing 1 and perform a telescopic action to drive the opening or closing of the car door.

[0023] At this time, the opening and closing of the car door is controlled by the forward and reverse rotation of the worm gear 7 driven by the motor 2, and the extension and retraction of the lead screw 8 is realized according to the forward and reverse rotation of the worm gear 7. During the extension and retraction process, the lead screw 8 generates an axial force, which is applied to the first bearing 4 and the housing 1 respectively. When the lead screw 8 moves towards the opening side, it applies an axial force to the first bearing 4, and the inner ring 4.1 and the outer ring 4.2 of the bearing are respectively subjected to force. In this embodiment, the first fastener 5 and the second fastener 6 are set on the side of the first bearing 4 away from the inner wall surface of the worm wheel 3 and the housing 1, so that the first bearing 4 is reliably constrained and forms an integral rigid support structure for the worm wheel 3. Through the contact surface of the housing 1 and the worm wheel 3 away from the pre-tightening component, the first bearing 4 can better bear the bidirectional axial force generated by the lead screw 8 during the extension and retraction action and the radial force brought by the transmission of the worm gear 7, preventing the bearing from fretting wear or uneven wear in the cavity, extending the service life of the entire drive, and relatively improving the reliability of the lead screw 8 action.

[0024] In a preferred embodiment, the worm wheel 3 includes a transmission part 3.1 that cooperates with the worm 7, and an inner surface that is threaded with the lead screw 8. That is, the inner surface is provided with threads, which is equivalent to the nut in the lead screw 8 nut mechanism being integrally formed with the worm wheel 3. This method provides the integrity of the worm wheel 3 and its threaded structure on the one hand, and reduces the axial movement of the worm wheel 3 on the other hand.

[0025] Of course, in other embodiments, a nut may be fitted onto the lead screw 8, and the worm gear 3 may be fixedly connected to the nut, so that the nut is driven when the worm gear 3 rotates.

[0026] Further reference Figure 3 and Figure 7 As shown, as a further embodiment of the worm gear 3, specifically, the worm gear 3 also includes a sleeve portion 3.2 extending axially relative to the transmission part 3.1. This sleeve portion 3.2 makes the worm gear 3 as a whole form a sleeve shape extending axially, which increases the axial dimension of the worm gear 3 and improves the stability of the worm gear 3 and the lead screw 8. The first bearing 4 is sleeved on the sleeve portion 3.2, and the second fastener 6 is fixed to the sleeve portion 3.2. By functionally partitioning the positions of the two ends of the transmission part 3.1 through the sleeve portion 3.2, the machining of the transmission part 3.1 of the worm gear 3 and the machining of the mating surfaces of the first bearing 4 and the second fastener 6 can be independently optimized, and a precise and stable mounting foundation is provided for the first bearing 4. The structure is clear and reasonable.

[0027] As a further explanation of the first fastener 5, the first fastener 5 is preferably an annular threaded fitting with external threads and internal threads on the inner wall of the opening side of the housing 1. That is, the first fastener 5 is screwed into the opening side of the housing 1 in a threaded connection manner. The end face of the first fastener 5 located inside the housing 1 abuts against the end face of the bearing outer ring 4.2 of the first bearing 4, so that the two end faces of the bearing outer ring 4.2 of the first bearing 4 are respectively pressed against the first fastener 5 and the inner wall of the housing 1.

[0028] Specifically, the transmission cavity includes a first bearing 4 seat 1.1, and the outer ring 4.2 of the bearing abuts against the first bearing 4 seat 1.1 at one end away from the first fastener 5. The first bearing 4 seat 1.1 specifically matches the contour of the outer ring 4.2 of the bearing and provides a support surface for one end face of the outer ring 4.2 of the bearing, providing a precise and reliable axial positioning reference for the outer ring 4.2 of the bearing.

[0029] Specifically, the first fastener 5 is provided with an operating part 5.1 for applying screwing force. The operating part 5.1 is positioned facing the opening side of the transmission cavity. Orienting the operating part 5.1 towards the opening side means that the preload can be adjusted and tightened from outside the housing 1 or from an easily accessible location. This facilitates assembly and subsequent maintenance, allowing operation without disassembling the entire device, thus improving the maintainability of the product.

[0030] As a further explanation of the second fastener 6, the second fastener 6 includes a support sleeve 6.1 that axially abuts against the inner ring 4.1 of the bearing, and a fixing ring 6.2 that is welded and fixed to the shaft sleeve portion 3.2. The fixing ring 6.2 axially abuts against the support sleeve 6.1 to constrain the inner ring 4.1 of the bearing. Both the fixing ring 6.2 and the support ring are sleeved on the shaft sleeve portion 3.2 of the worm gear 3. In this embodiment, the fixing ring 6.2 is constrained by welding and fixing, thereby controlling the axial position of the support sleeve 6.1 and forcing the support sleeve 6.1 to abut against the end face of the inner ring 4.1 of the first bearing 4 in a pre-pressed posture.

[0031] The bearing employs a split-type support sleeve 6.1 and retaining ring 6.2. The support sleeve 6.1 can function as an independent adjusting shim, facilitating control of the preload position and preload force on the inner ring 4.1 of the bearing. The retaining ring 6.2 is fixed by welding, preferably laser welding, ensuring a strong and reliable connection capable of withstanding the impact torque from frequent forward and reverse rotations, thus guaranteeing the long-term effectiveness of the preload.

[0032] Specifically, the transmission part 3.1 is a toothed part provided on the circumference of the worm gear 3, which is used to mesh with the worm 7. The transmission part 3.1 protrudes radially from the shaft sleeve part 3.2 and forms a first support platform 3.3 that abuts against the inner ring 4.1 of the bearing, so that the inner and outer end faces of the inner ring 4.1 abut against the first support platform 3.3 formed by the transmission part 3.1 and the support sleeve 6.1 of the second fastener 6 respectively.

[0033] from Figure 3 and Figure 7 As can be seen, as a further embodiment of the shaft sleeve portion 3.2, to further define the relative positions of the second fastener 6 and the first bearing 4 on the worm gear 3, the shaft sleeve portion 3.2 includes a first shaft sleeve 3.21 and a second shaft sleeve 3.22. The first shaft sleeve 3.21 and the second shaft sleeve 3.22 are arranged sequentially from the transmission part 3.1 toward the opening side of the housing 1. The first shaft sleeve 3.21 is connected to the transmission part 3.1 and is correspondingly arranged with respect to the first bearing 4 seat 1.1. The bearing inner ring 4.1 of the first bearing 4 is sleeved on the first shaft sleeve 3.21. The first fastener 5 is arranged on the second shaft sleeve 3.22. The first shaft sleeve 3.21 and the second shaft sleeve 3.22 form a second support platform 3.4 opposite to the support sleeve 6.1.

[0034] Preferably, the outer diameter of the first shaft cylinder 3.21 is larger than the outer diameter of the second shaft cylinder 3.22 to form the second support platform 3.4. The second support platform 3.4 serves as the positioning surface of the support sleeve 6.1 to define the axial position of the support sleeve 6.1. At the same time, the end face of the bearing inner ring 4.1 of the first bearing 4 is flush with the second support platform 3.4.

[0035] As a variation of the second support platform 3.4, the end face of the bearing inner ring 4.1 of the first bearing 4 extends out of the first shaft sleeve 3.21, that is, it extends out of the second support platform 3.4. The support sleeve 6.1 is spaced apart from the end face of the second support platform 3.4, so that the support platform, supported by the fixing ring 6.2, only abuts against the bearing inner ring 4.1 of the first bearing 4 in the axial direction, thereby controlling the abutment effect on the bearing inner ring 4.1 of the first bearing 4.

[0036] In the above embodiments, the different outer diameters of the shaft cylinder portions 3.2 make the machining sequence of the worm gear 3 and the installation sequence of the bearings and fasteners clearer, which is beneficial to improving the machining accuracy of the parts and the convenience of assembly.

[0037] like Figures 5 to 7 As shown, specifically, the shaft sleeve portion 3.2 also includes a third shaft sleeve 3.23 disposed opposite to the first bearing 4, and a second bearing 9 is sleeved on the third shaft sleeve 3.23. The outer ring of the second bearing 9 abuts against the second bearing 9, and the inner ring of the second bearing 9 is tightly held on the third shaft cylinder 3.23. One end face of the inner ring of the second bearing 9 abuts against the worm gear 3, and the other end face of the outer ring of the second bearing 9 abuts against the inner wall of the transmission cavity. The worm gear 3 abuts against the inner and outer ring end faces of the second bearing 9, respectively, with the inner wall of the transmission cavity facing each other.

[0038] Further integration Figure 3As shown, specifically, the third shaft cylinder 3.23 has an axial protrusion 3.24 corresponding to the inner ring of the second bearing 9. The transmission cavity also includes a second bearing 9 seat 1.2 that cooperates with the second bearing 9. The second bearing 9 seat 1.2 is correspondingly arranged with the third shaft cylinder 3.23, and the axial protrusion 3.24 is axially opposite to the second bearing 9 seat 1.2.

[0039] By adding a second bearing 9 at the other end of the worm gear 3, a support structure for the front and rear ends of the worm gear 3 is formed, effectively suppressing the bending deformation of the worm gear 3 shaft caused by the radial force generated by the meshing of the worm 7, resulting in smoother transmission, lower noise, and longer service life. The relative arrangement of the axial protrusion 3.24 and the second bearing 9 seat 1.2 provides axial positioning for the second bearing 9, and works in conjunction with the preload assembly on the side of the first bearing 4 to constrain the axial degree of freedom of the entire worm gear 3 assembly.

[0040] As a further embodiment of the axial protrusion 3.24, the axial protrusion 3.24 may be circumferentially spaced on the third shaft cylinder 3.23 and connected to the end face of the transmission part 3.1, or it may form a ring structure.

[0041] The second bearing 9 and the first bearing 4 constrain the radial and axial positions of the worm wheel. The axial position of the worm wheel is further constrained by the cooperation of the first bearing, the first fastener, and the second fastener. The second bearing 9 and the first bearing 4 are arranged on both sides of the transmission part 3.1 and are located on both sides of the worm 7. The second bearing 9 is spaced from the transmission part 3.1 in the axial direction of the worm wheel 3 by the axial protrusion 3.24, so that the first bearing 4 is arranged closer to the transmission part 3.1 than the second bearing 9. Thus, the first bearing 4 is close to the meshing position of the worm 7 and the worm wheel 3 and bears the main load.

[0042] In other embodiments, the outer diameter of the outer ring of the first bearing 4 is larger than the outer diameter of the outer ring of the second bearing 9, and the outer diameter of the inner ring of the first bearing 4 is smaller than the outer diameter of the outer ring of the second bearing 9.

[0043] In the above embodiment, the first bearing 4, located near the meshing part of the worm gear 7, needs to bear the main radial meshing force and the bidirectional axial force transmitted by the lead screw 8. Therefore, a bearing with a larger outer diameter is used to provide reliable radial and axial load-bearing capacity and support rigidity. The second bearing 9, as an auxiliary support, mainly functions to improve the operational stability of the worm gear 3 shaft. A bearing with a smaller outer diameter is sufficient to meet its force requirements, while perfectly adapting to the compact space that may exist at the far end of the housing 1, achieving an optimized balance between structural strength and space utilization. This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A worm gear fixing structure for a vehicle door actuator, characterized in that, include: The housing (1), the motor (2) connected to the housing (1), and the transmission assembly disposed in the housing (1) are provided in the housing (1), the housing (1) is provided with a transmission cavity for accommodating the transmission assembly, the transmission assembly includes a worm gear (3) placed in the transmission cavity, a first bearing (4) sleeved on the worm gear (3), and a preload assembly constraining the inner and outer rings of the first bearing (4), the worm gear (3) receiving the driving force of the motor (2) and transmitting torque; The outer ring (4.2) of the first bearing (4) is tightly fitted to the inner wall of the transmission cavity, and the inner ring (4.1) of the first bearing (4) is fixedly abutted against the worm gear (3). The preload assembly includes a first fastener (5) threaded to the opening side of the transmission cavity and a second fastener (6) fixed to the worm gear (3). The outer ring (4.2) of the bearing is axially abutted between the inner wall of the transmission cavity and the first fastener (5), and the inner ring (4.1) of the bearing is abutted against the second fastener (6) and the radial protrusion of the worm gear (3).

2. The worm gear fixing structure for a vehicle door actuator according to claim 1, characterized in that: The transmission assembly also includes a worm (7) disposed on the output end of the motor (2), the worm wheel (3) having a transmission part (3.1) that cooperates with the worm (7) and a shaft sleeve part (3.2) that extends axially relative to the transmission part (3.1), the first bearing (4) being sleeved on the shaft sleeve part (3.2), and the second fastener (6) being fixed to the shaft sleeve part (3.2).

3. The worm gear fixing structure for a vehicle door actuator according to claim 2, characterized in that: The second fastener (6) includes a support sleeve (6.1) that abuts axially against the inner ring (4.1) of the bearing, and a retaining ring (6.2) that is welded and fixed to the shaft sleeve (3.2). The retaining ring (6.2) abuts axially against the support sleeve (6.1) to constrain the inner ring (4.1) of the bearing.

4. The worm gear fixing structure for a vehicle door actuator according to claim 2, characterized in that: The transmission part (3.1) protrudes radially from the shaft sleeve part (3.2) and forms a first support platform (3.3) that abuts against the inner ring (4.1) of the bearing.

5. The worm gear fixing structure for a vehicle door actuator according to claim 3, characterized in that: The shaft sleeve portion (3.2) includes a first shaft sleeve (3.21) and a second shaft sleeve (3.22). The bearing inner ring (4.1) is sleeved on the first shaft sleeve (3.21). The first fastener (5) is arranged on the second shaft sleeve (3.22). The first shaft sleeve (3.21) and the second shaft sleeve (3.22) form a second support platform (3.4) opposite to the support sleeve (6.1).

6. The worm gear fixing structure for a vehicle door actuator according to claim 1, characterized in that: The first fastener (5) is provided with an operating part (5.1) for applying screwing actuation force, and the operating part (5.1) is arranged facing the opening side of the transmission cavity.

7. The worm gear fixing structure for a vehicle door actuator according to claim 1, characterized in that: The transmission cavity includes a first bearing housing (1.1), and the outer ring (4.2) of the bearing abuts against the first bearing housing (1.1) at one end away from the first fastener (5).

8. The worm gear fixing structure for a vehicle door actuator according to claim 2, characterized in that: The shaft sleeve portion (3.2) also includes a third shaft sleeve (3.23) disposed away from the first bearing (4). A second bearing (9) is sleeved on the third shaft sleeve (3.23). The inner ring of the second bearing (9) abuts against the worm gear (3), and the outer ring of the second bearing (9) abuts against the inner wall of the transmission cavity.

9. A worm gear fixing structure for a vehicle door actuator according to claim 8, characterized in that: The third shaft cylinder (3.23) has an axial protrusion (3.24) corresponding to the inner ring of the second bearing (9). The transmission cavity also includes a second bearing seat (1.2) that cooperates with the second bearing (9). The axial protrusion (3.24) and the second bearing seat (1.2) are arranged opposite each other in the axial direction.

10. A worm gear fixing structure for a vehicle door actuator according to claim 1, characterized in that: A lead screw (8) is also installed inside the transmission cavity. The inner wall of the worm wheel (3) is threaded to the lead screw (8), or a nut is fitted on the lead screw (8), and the worm wheel (3) is fixedly connected to the nut to drive the lead screw (8) to perform extension and retraction.

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