An electric limiter for intelligent vehicle doors

Abstract

The present invention discloses an electric limiter for smart car doors, comprising a housing and a driving device arranged therein, the driving device being connected to a transmission assembly, the transmission assembly being connected to a push rod device, a push rod resistance adjustment device being arranged inside the housing, the push rod device comprising a push rod, the push rod resistance adjustment device comprising a fixed slider and an adjustable slider, the fixed slider and the adjustable slider being arranged on opposite sides of the push rod and in contact with the push rod surface, one end of an elastic member being connected to the adjustable slider, the other end of the elastic member being connected to an adjustment assembly, the adjustment assembly being configured to increase or decrease the friction between the adjustable slider and the fixed slider and the push rod by squeezing or relaxing the elastic member, thereby adjusting the push rod travel resistance. The electric limiter for smart car doors provided by the present invention can adjust the push rod resistance, thereby improving the consistency of the door system, while also enhancing the waterproof effect of the product and improving production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile manufacturing, and in particular to an electric limiter for an intelligent vehicle door. Background Art

[0002] With the advancement of electrification and intelligent vehicles, electric door opening and closing has become increasingly common. The configuration rate of electric tailgates has exceeded 50%, and intelligent electric side doors are also available on a few high-end models. Electric stoppers, as core components of intelligent electric side doors, are still in their early stages of development. While existing products achieve basic functionality and performance, they often have various deficiencies in meeting higher-level requirements such as consistency, reliability, comfort, and cost, and the product's maturity needs to be continuously improved. For example, the internal resistance value of the device varies significantly between different parts of the same product, resulting in poor consistency in door system performance, a common pain point in the industry. Existing electric stoppers typically utilize a barrel-shaped structure, resulting in a large draft angle during production, creating a large gap between the push rod and the push rod slide, which can easily cause the push rod to wobble. Some existing products lack consideration for high-volume manufacturing processes, resulting in cumbersome assembly of fasteners and low production efficiency. Some products use raw metal push rods, resulting in poor visual quality. The present invention aims to develop a relatively complete electric limiter product to solve the pain points of the above products and promote the development of the industry. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the current electric limiter, the present invention provides an electric limiter for smart car doors, which can adjust the resistance of the push rod after assembly is completed, thereby improving the consistency of the car door system and solving the problem that the gap between the push rod slider and the guide groove is large, which makes the push rod easy to shake.

[0004] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0005] 7. The swiftly and minutely adjusting device for a wood-planer working table as claimed in claim 1, wherein said linking rod and said adjusting base are pivotally connected to each other with a bolt, and said bolt has a round shank to contact with said linking rod.

[0006] According to one aspect of the present invention, the push rod device further includes a vehicle body fixing bracket, the vehicle body fixing bracket is connected to the push rod, and the push rod is connected to the transmission assembly.

[0007] According to one aspect of the present invention, the adjustment assembly includes an adjustment bolt and an adjustment nut fixedly disposed in the housing, the adjustment bolt is connected to the elastic member, and the adjustment nut is sleeved on the adjustment bolt.

[0008] According to one aspect of the present invention, the push rod includes a core rod, and the outer surface of the core rod is provided with a plastic coating.

[0009] According to one aspect of the present invention, the transmission assembly includes a gear transmission assembly, the gear transmission assembly is connected to the driving device, the gear transmission assembly is connected to the screw assembly, the screw assembly is provided with a push rod nut slider assembly, and the push rod nut slider assembly is connected to the push rod.

[0010] According to one aspect of the present invention, the gear transmission assembly includes a first gear shaft connected to the driving device, the first gear shaft is sleeved with a first gear, the first gear is meshed with a second gear, the second gear is sleeved on the second gear shaft, the second gear shaft is arranged on the housing, the second gear is meshed with a third gear, and the third gear is connected to the screw assembly.

[0011] According to one aspect of the present invention, the screw assembly includes a screw, the third gear is sleeved on the screw, one end of the screw is connected to the housing through a self-lubricating bushing, and the other end of the screw is connected to the housing through a deep groove ball bearing.

[0012] According to one aspect of the present invention, the push rod nut slider assembly includes a screw nut sleeved on the screw rod, a push rod slider is fixedly mounted on the screw nut, and the push rod slider is connected to the push rod.

[0013] According to one aspect of the present invention, the shell includes an upper shell and a lower shell, the upper shell is fixedly connected to the lower shell, and a sealing assembly is provided between the upper shell and the lower shell, and the sealing assembly is used to prevent water from entering the interior of the shell.

[0014] According to one aspect of the present invention, the sealing assembly includes a water-retaining brim arranged on the edge of the upper shell, a water-retaining boss arranged on the edge of the lower shell, the upper shell is provided with a rib, the lower shell is provided with a groove at a position corresponding to the rib, and a sealing strip is provided in the groove.

[0015] Advantages of the present invention include: by providing the water-retaining boss and the water-retaining brim, the first and second waterproofing layers are achieved through the shell structure itself without increasing costs; by the interference fit between the rib and the sealing strip, the third waterproofing layer is achieved; the provision of the sealing assembly improves the waterproof and dustproof level of the product, thereby expanding its scope of application. By providing the push rod resistance adjustment device, the friction resistance of the push rod can be precisely adjusted. This resistance acts directly on the push rod, effectively eliminating the invalid travel of the push rod, thereby preventing the user from feeling the door shaking during use; at the same time, this design allows the resistance of the electric limiter to be controlled within a smaller tolerance range, ensuring that the resistance felt by the user when opening and closing the door is more consistent, thereby improving the quality of the door; by providing the adjustment bolt, the resistance can be finely adjusted after assembly. The push rod is made of a core rod made of high-strength material, and a plastic coating is provided on the outside of the core rod, which not only meets the strength requirements but also ensures the appearance quality; by setting the upper shell and the lower shell, and using self-tapping screws to connect the two, compared with the barrel-shaped electric limiter in the prior art, the number of screws to be assembled is significantly reduced, the production efficiency is improved and the installation process is simplified; at the same time, it solves the problem of the large draft angle limitation in the barrel-shaped structure in the prior art, which causes the guide groove to be non-parallel before and after, and the gap between the push rod slider and the guide groove is too large, thereby causing shaking. The electric limiter for a smart car door provided by the present invention can adjust the push rod resistance after assembly is completed, thereby improving the consistency of the car door system. At the same time, it also enhances the waterproof effect of the product, improves production efficiency, and solves the problem of the large gap between the push rod slider and the guide groove, which makes the push rod easy to shake. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the installation of an electric limiter for an intelligent door according to the present invention;

[0018] Figure 2 This is an exploded schematic diagram of an electric limiter for a smart vehicle door according to the present invention;

[0019] Figure 3 A partial schematic diagram of a driving device for an electric limiter for an intelligent vehicle door according to the present invention;

[0020] Figure 4 This is a partial schematic diagram of a screw rod assembly of an electric limiter for an intelligent vehicle door according to the present invention;

[0021] Figure 5 This is a partial schematic diagram of a push rod resistance adjustment device of an electric limiter for an intelligent vehicle door according to the present invention;

[0022] Figure 6 This is a cross-sectional schematic diagram of an electric limiter for an intelligent vehicle door according to the present invention;

[0023] Figure 7 This is a partial schematic diagram of a push rod, nut and slider assembly of an electric limiter for an intelligent vehicle door according to the present invention;

[0024] Figure 8 This is a schematic diagram of the deflection of the push rod slider of the electric limiter for the smart door according to the present invention;

[0025] Figure 9 This is a partial schematic diagram of a sealing assembly of an electric limiter for an intelligent vehicle door according to the present invention;

[0026] Figure 10 This is a schematic cross-sectional view of a push rod of an electric limiter for an intelligent vehicle door according to the present invention.

[0027] 1. Housing; 11. Upper housing; 12. Lower housing; 13. Sealing assembly; 131. Sealing strip; 132. Water-retaining cap brim; 133. Rib; 134. Water-retaining boss; 135. Groove; 14. Guide groove; 15. Tapping screw; 2. Push rod resistance adjustment device; 21. Fixed slider; 22. Adjustable slider; 23. Adjusting bolt; 24. Adjusting nut; 25. Elastic member; 26. Elastic member baffle; 3. Driving device; 31. Output shaft assembly; 311. Motor output shaft; 312. Buffer cap; 313. Bushing bearing; 32. Driving motor; 4. Transmission assembly; 41. Gear transmission assembly; 411. First gear shaft; 412. First gear; 413 , second gear; 414, second gear shaft; 415, third gear; 42, screw assembly; 421, screw; 422, deep groove ball bearing; 423, self-lubricating bushing; 43, push rod nut slider assembly; 431, screw nut; 432, push rod slider; 4321, protrusion; 433, push rod fixing pin; 434, push rod pin nut; 5, push rod device; 51, vehicle body fixing bracket; 52, push rod; 521, core rod; 522, plastic coating; 53, push rod pin; 6, vehicle door mounting base; 7, vehicle door; 8, vehicle body; B, push rod center plane; G, screw axis; H, screw nut axis; K, push rod slider guide groove direction line; α, angle between G and H. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Preferred embodiment 1

[0030] like Figures 1 to 10As shown, an electric limiter for a smart car door is mainly used for electric rotating side doors of cars. The electric limiter includes a housing 1, one side of which is provided with a car door mounting base 6. The electric limiter is mounted on the car door 7 via the car door mounting base 6. Preferably, the car door mounting base 6 and the car door 7 are fastened together by nuts. The housing 1 includes an upper housing 11 and a lower housing 12 fixedly connected to the upper housing 11. The upper housing 11 and the lower housing 12 are fixedly connected by self-tapping screws 15. Preferably, the upper housing 11 and the lower housing 12 adopt a non-completely symmetrical design, and when assembled, the number of fixing screws is preferably 8. The housing 1 is internally provided with a drive device 3, which is connected to a transmission assembly 4, and the transmission assembly 4 is connected to a push rod device 5. Under the drive of the drive device 3, the movement of the push rod device 5 can be transmitted through the transmission assembly 4. The push rod device 5 is connected to a push rod resistance adjustment device 2, which is used to adjust the resistance of the push rod device 5.

[0031] In actual application, the driving device 3 includes a driving motor 32 installed in the lower shell 12, the output end of the driving motor 32 is connected to the output shaft assembly 31, the driving motor is electrically connected through a motor wiring harness, and the output shaft assembly 31 includes a motor output shaft 311 connected to the output end of the driving motor 32, and the motor output shaft 311 is connected to the transmission assembly 4.

[0032] In actual application, the transmission assembly 4 includes a gear transmission assembly 41, the gear transmission assembly 41 is connected to the driving device 3, the gear transmission assembly 41 is connected to the screw assembly 42, the screw assembly 42 is provided with a push rod nut slider assembly 43, and the push rod nut slider assembly 43 is connected to the push rod device 5.

[0033] In actual application, the gear transmission assembly 41 includes a first gear shaft 411 connected to the driving device 3. Specifically, the first gear shaft 411 is connected to the motor output shaft 311 through a buffer cap 312. The buffer cap 312 is a rubber elastic body that can buffer the gap between the motor output shaft 311 and the first gear shaft 411. The first gear shaft 411 is installed inside the lower housing 12. The first gear shaft 411 is sleeved with a bushing bearing 313. The first gear shaft 411 is sleeved with a first gear 412. The first gear 412 is meshed with a second gear 413. The second gear 413 is sleeved on a second gear shaft 414. The second gear shaft 414 is installed inside the lower housing 12. The second gear 413 is meshed with a third gear 415. The third gear 415 is connected to the screw assembly 42. The first gear shaft 411, the second gear shaft 414 and the third gear 415 form a two-stage gear transmission.

[0034] In actual application, the screw assembly 42 includes a screw 421, the third gear 415 is sleeved on the screw 421, both ends of the screw 421 are installed on the lower shell 12, one end of the screw 421 is connected to the lower shell 12 through a self-lubricating bushing 423, and the other end of the screw 421 is connected through a deep groove ball bearing 422, the push rod nut slider assembly 43 is installed on the screw 421, the push rod nut slider assembly 43 includes a screw nut 431 sleeved on the screw 421, and a push rod slider 432 is installed on the outer surface of the screw nut 431. Preferably, the screw nut 431 is fastened to the push rod slider 432 by threads; the push rod 52 is fastened to the push rod slider 432 by threaded cooperation of a push rod fixing pin 433 and a push rod pin nut 434.

[0035] In actual application, the push rod slider 432 is symmetrically provided with protrusions 4321 on both sides, and the corresponding positions of the upper shell 11 and the lower shell 12 where the push rod slider 432 is installed are provided with guide grooves 14. The push rod slider 432 can slide in the guide grooves 14, and the guide grooves 14 can play a positioning and restraining guiding role for the push rod slider 432. The guide grooves 14 are parallel to the axis of the screw rod 421. When the push rod 52 is subjected to a force in the opposite direction to the force applied to the screw nut 431, the screw nut 431 tends to deflect, forming α (the angle between the screw axis G and the screw nut axis H), as shown in FIG. Figure 7 and Figure 8 The guide groove 14 and the protrusion 4321 can keep the push rod slider 432 moving along the push rod slider guide groove direction line K, thereby keeping the screw axis G and the screw nut axis H collinear or with a minimum deflection α. ​​This structure can eliminate the risks of increased resistance, increased wear, and abnormal noise between the screw 421 and the screw nut 431 without adding additional guide rails.

[0036] In actual application, the push rod device 5 includes a body fixing bracket 51, which is installed on the body 8. The body fixing bracket 51 is fixed to the body 8 by bolts. The body fixing bracket 51 is connected to the push rod 52. The body fixing bracket 51 and the push rod 52 are riveted together by a push rod pin 53. The push rod pin 53 is preferably a stepped pin. The body fixing bracket 51 is connected to the push rod nut slider assembly 43 through the push rod 52.

[0037] In practice, the push rod 52 includes a central core rod 521, which is coated with a plastic coating 522. The core rod 521 is connected to the push rod nut slider assembly 43. Preferably, the core rod 521 has a steel core, preferably high-strength carbon steel, to meet the strength requirements of the push rod. The plastic coating can be made of PA, ABS, PP, PE, PVC, silicone, etc. The plastic coating 522 is wrapped around the outer surface of the core rod 521 using an overmolding process, resulting in a smooth and beautiful surface. It is used to improve the appearance quality of the visible area of ​​the push rod 52 and enhance the wear resistance of the push rod 52.

[0038] In actual application, the push rod resistance adjustment device 2 includes a fixed slider 21 and an adjustable slider 22. The fixed slider 21 and the adjustable slider 22 are relatively arranged on both sides of the push rod 52 and in surface contact with the push rod 52. The fixed slider 21 is fixedly installed on the lower shell 12, and the adjustable slider 22 is movably connected to the lower shell 12. The end of the adjustable slider 22 away from the push rod 52 is connected to the elastic member 25. The elastic member 25 can be a coil spring, a spring, etc. The other end of the elastic member 25 is connected to an adjustment component. The adjustment component is configured to increase or decrease the elastic potential energy of the elastic member 25 by squeezing or relaxing the elastic member 25, thereby causing the thrust applied to the adjustable slider by the elastic member 25 to increase or decrease, thereby increasing or decreasing the friction between the adjustable slider 22 and the fixed slider 21 and the push rod to adjust the push rod travel resistance. The adjustment mechanism includes an adjustment bolt 23 connected to the other end of the elastic member 25. An elastic stopper 26 is interposed between the adjustment bolt 23 and the elastic member 25. An adjustment nut 24 is fixedly mounted on the bottom surface of the lower housing 12. The adjustment nut 24 fits over the adjustment bolt 23. The head of the adjustment bolt 23 passes through the outer wall of the lower housing 12 and is located outside the housing 1. The adjustment nut 24 uses a self-locking anti-loosening mechanism to prevent the adjustment bolt 23 from loosening. The central axis of the elastic member 25 is collinear with the central axis of the adjustment bolt 23, parallel to the direction of the adjustable slider 22, and perpendicular to the center plane B of the thickness of the push rod 52. The user can adjust the compression length and elastic force of the elastic member 25 by screwing the adjustment bolt 23 in and out. The elastic force of the elastic member 25 acts on the adjustable slider 22, which in turn applies pressure to the surface of the push rod 52. The magnitude of this pressure changes the friction between the adjustable slider 22 and the push rod 52, thereby adjusting the resistance experienced by the push rod 52. The factors that affect the resistance of the entire electric limiter include the motor tooth torque, the internal resistance of the reduction box, the friction resistance of the transmission gear assembly, the friction resistance between the screw and the nut, the friction resistance of the push rod, etc. In actual production, the accumulated resistance of these factors will fluctuate greatly. By adjusting the bolt 23 to change the friction resistance of the push rod 52, the fluctuation of the resistance of other components can be compensated, and ultimately the resistance of the electric limiter can be kept at a smaller fluctuation.

[0039] Working Principle: The main body of the electric limiter is installed in the vehicle door 7, and the vehicle body fixing bracket 51 is installed on the vehicle body 8. The vehicle body fixing bracket 51 is connected to the main body of the electric limiter via a push rod 52. The extension and contraction of the push rod 52 drives the vehicle door 7 to open and close. Its function is realized as follows: the driving device 3 is energized to drive the output shaft assembly 31 to rotate. The output shaft assembly 31 is connected to the first gear shaft 411 of the gear transmission assembly 41. The gear transmission assembly 41 transmits power from the first gear shaft 411 to the screw rod 421, and the speed is adjusted to change the output torque. The third gear 415 is connected to the screw rod assembly 42 to drive the screw rod 421 to rotate. The screw rod 421 drives the push rod nut slider assembly 43 to move back and forth along the screw rod axis G. The push rod nut slider assembly 43 is connected to the push rod device 5, driving the push rod device 5 to perform back and forth telescopic movement. When push rod 52 extends, door 7 opens; when push rod 52 retracts, door 7 closes. The direction of push rod 52 extension and retraction is changed by rotating motor 32 in both directions. Push rod resistance adjustment device 2 is used to adjust the internal resistance of the electric limiter, balancing individual differences in resistance among other transmission components within the device and ensuring consistent resistance across the entire device assembly.

[0040] The advantages of the present invention are as follows: the push rod resistance adjustment device can precisely adjust the friction resistance of the push rod. This resistance acts directly on the push rod, effectively eliminating the invalid travel of the push rod, thereby preventing the user from feeling the door shaking during use; at the same time, this design allows the resistance of the electric limiter to be controlled within a smaller tolerance range, ensuring more consistent resistance felt by the user when opening and closing the door, thereby improving the quality of the door; and the setting of the adjustment bolt allows fine adjustment of the resistance after assembly. The push rod adopts a core rod made of high-strength material and is coated with a plastic layer on the outside of the core rod, which not only meets the strength requirements but also ensures the appearance quality; the upper and lower shells are provided and connected with self-tapping screws. Compared with the barrel-shaped electric limiter in the prior art, the number of screws required for assembly is significantly reduced, thereby improving production efficiency and simplifying the installation process; at the same time, it solves the problem of large draft angle limitation in the barrel-shaped structure in the prior art, which leads to non-parallelism of the guide groove and excessive gap between the push rod slider and the guide groove, thus causing shaking.

[0041] Preferred embodiment 2

[0042] like Figures 1 to 10The present invention discloses an electric limiter for a smart car door. The electric limiter is primarily used for electrically rotating side-opening doors on cars. The electric limiter comprises a housing 1, with a door mounting base 6 disposed on one side of the housing 1. The electric limiter is mounted on a car door 7 via the door mounting base 6. Preferably, the door mounting base 6 and the car door 7 are fastened together by nuts. The housing 1 comprises an upper housing 11 and a lower housing 12 fixedly connected to the upper housing 11. The upper and lower housings 11 and 12 are fixedly connected by self-tapping screws 15. Preferably, the upper and lower housings 11 and 12 are non-completely symmetrical, and when assembled, the number of fixing screws is preferably eight. A sealing assembly 13 is disposed between the upper and lower housings 11 and 12. The sealing assembly 13 is used to prevent water from entering the interior of the housing 1 through the gap between the housings. The housing 1 comprises a drive unit 3 disposed within the housing 1. The drive unit 3 is connected to a transmission assembly 4, which is in turn connected to a push rod assembly 5. Driven by the drive unit 3, the push rod assembly 5 is driven by the transmission assembly 4 to transmit motion. The push rod device 5 is connected to a push rod resistance adjusting device 2 , and the push rod resistance adjusting device 2 is used to adjust the resistance of the push rod device 5 .

[0043] In actual application, the driving device 3 includes a driving motor 32 installed in the lower shell 12, the output end of the driving motor 32 is connected to the output shaft assembly 31, the driving motor is electrically connected through a motor wiring harness, and the output shaft assembly 31 includes a motor output shaft 311 connected to the output end of the driving motor 32, and the motor output shaft 311 is connected to the transmission assembly 4.

[0044] In actual application, the transmission assembly 4 includes a gear transmission assembly 41, the gear transmission assembly 41 is connected to the driving device 3, the gear transmission assembly 41 is connected to the screw assembly 42, the screw assembly 42 is provided with a push rod nut slider assembly 43, and the push rod nut slider assembly 43 is connected to the push rod device 5.

[0045] In actual application, the gear transmission assembly 41 includes a first gear shaft 411 connected to the driving device 3. Specifically, the first gear shaft 411 is connected to the motor output shaft 311 through a buffer cap 312. The buffer cap 312 is a rubber elastic body that can buffer the gap between the motor output shaft 311 and the first gear shaft 411. The first gear shaft 411 is installed inside the lower housing 12. The first gear shaft 411 is sleeved with a bushing bearing 313. The first gear shaft 411 is sleeved with a first gear 412. The first gear 412 is meshed with a second gear 413. The second gear 413 is sleeved on a second gear shaft 414. The second gear shaft 414 is installed inside the lower housing 12. The second gear 413 is meshed with a third gear 415. The third gear 415 is connected to the screw assembly 42. The first gear shaft 411, the second gear shaft 414 and the third gear 415 form a two-stage gear transmission.

[0046] In actual application, the screw assembly 42 includes a screw 421, the third gear 415 is sleeved on the screw 421, both ends of the screw 421 are installed on the lower shell 12, one end of the screw 421 is connected to the lower shell 12 through a self-lubricating bushing 423, and the other end of the screw 421 is connected through a deep groove ball bearing 422, the push rod nut slider assembly 43 is installed on the screw 421, the push rod nut slider assembly 43 includes a screw nut 431 sleeved on the screw 421, and a push rod slider 432 is installed on the outer surface of the screw nut 431. Preferably, the screw nut 431 is fastened to the push rod slider 432 by threads; the push rod 52 is fastened to the push rod slider 432 by threaded cooperation of a push rod fixing pin 433 and a push rod pin nut 434.

[0047] In actual application, the push rod slider 432 is symmetrically provided with protrusions 4321 on both sides, and the corresponding positions of the upper shell 11 and the lower shell 12 where the push rod slider 432 is installed are provided with guide grooves 14. The push rod slider 432 can slide in the guide grooves 14, and the guide grooves 14 can play a positioning and restraining guiding role for the push rod slider 432. The guide grooves 14 are parallel to the axis of the screw rod 421. When the push rod 52 is subjected to a force in the opposite direction to the force applied to the screw nut 431, the screw nut 431 tends to deflect, forming α (the angle between the screw axis G and the screw nut axis H), as shown in FIG. Figure 7 and Figure 8The guide groove 14 and the protrusion 4321 can keep the push rod slider 432 moving along the push rod slider guide groove direction line K, thereby keeping the screw axis G and the screw nut axis H collinear or with a minimum deflection α. ​​This structure can eliminate the risks of increased resistance, increased wear, and abnormal noise between the screw 421 and the screw nut 431 without adding additional guide rails.

[0048] In actual application, the push rod device 5 includes a body fixing bracket 51, which is installed on the body 8. The body fixing bracket 51 is fixed to the body 8 by bolts. The body fixing bracket 51 is connected to the push rod 52. The body fixing bracket 51 and the push rod 52 are riveted together by a push rod pin 53. The push rod pin 53 is preferably a stepped pin. The body fixing bracket 51 is connected to the push rod nut slider assembly 43 through the push rod 52.

[0049] In practice, the push rod 52 includes a central core rod 521, which is covered with a plastic coating 522. The core rod is connected to the push rod nut slider assembly 43. Preferably, the core rod 521 is a steel core, preferably high-strength carbon steel, to meet the push rod's strength requirements. The plastic coating can be made of PA, ABS, PP, PE, PVC, silicone, or other materials. The plastic coating 522 is wrapped around the outer surface of the core rod 521 using an overmolding process, resulting in a smooth and aesthetically pleasing surface, enhancing the appearance of the visible area of ​​the push rod 52 and enhancing the wear resistance of the push rod 52.

[0050] In actual application, the push rod resistance adjustment device 2 includes a fixed slider 21 and an adjustable slider 22. The fixed slider 21 and the adjustable slider 22 are relatively arranged on both sides of the push rod 52 and in surface contact with the push rod 52. The fixed slider 21 is fixedly installed on the lower shell 12, and the adjustable slider 22 is movably connected to the lower shell 12. The end of the adjustable slider 22 away from the push rod 52 is connected to the elastic member 25. The elastic member 25 can be a coil spring, a spring, etc. The other end of the elastic member 25 is connected to an adjustment component. The adjustment component is configured to increase or decrease the elastic potential energy of the elastic member 25 by squeezing or relaxing the elastic member 25, thereby causing the thrust applied to the adjustable slider by the elastic member 25 to increase or decrease, thereby increasing or decreasing the friction between the adjustable slider 22 and the fixed slider 21 and the push rod to adjust the push rod travel resistance. The adjustment mechanism includes an adjustment bolt 23 connected to the other end of the elastic member 25. An elastic stopper 26 is interposed between the adjustment bolt 23 and the elastic member 25. An adjustment nut 24 is fixedly mounted on the bottom surface of the lower housing 12. The adjustment nut 24 fits over the adjustment bolt 23. The head of the adjustment bolt 23 passes through the outer wall of the lower housing 12 and is located outside the housing 1. The adjustment nut 24 uses a self-locking anti-loosening mechanism to prevent the adjustment bolt 23 from loosening. The central axis of the elastic member 25 is collinear with the central axis of the adjustment bolt 23, parallel to the direction of the adjustable slider 22, and perpendicular to the center plane B of the thickness of the push rod 52. The user can adjust the compression length and elastic force of the elastic member 25 by screwing the adjustment bolt 23 in and out. The elastic force of the elastic member 25 acts on the adjustable slider 22, which in turn applies pressure to the surface of the push rod 52. The magnitude of this pressure changes the friction between the adjustable slider 22 and the push rod 52, thereby adjusting the resistance experienced by the push rod 52. The factors that affect the resistance of the entire electric limiter include the motor tooth torque, the internal resistance of the reduction box, the friction resistance of the transmission gear assembly, the friction resistance between the screw and the nut, the friction resistance of the push rod, etc. In actual production, the accumulated resistance of these factors will fluctuate greatly. By adjusting the bolt 23 to change the friction resistance of the push rod 52, the fluctuation of the resistance of other components can be compensated, and ultimately the resistance of the electric limiter can be kept at a smaller fluctuation.

[0051] In actual application, the sealing assembly 13 includes a water-retaining brim 132 provided on the edge of the outer peripheral wall of the upper shell 11, a rib 133 provided on the outer peripheral wall of the upper shell 11, a water-retaining boss 134 provided on the outer peripheral wall edge of the lower shell 12, a groove 135 provided on the outer peripheral wall of the lower shell 12 at a position corresponding to the rib 133, a sealing strip 131 provided in the groove 135, and the rib 133 and the sealing strip 131 have an interference fit. Preferably, a drive motor compartment is provided at the drive device 3 to separate the drive motor compartment from the screw compartment, and a sealing strip 131 is provided on the wall of the drive motor compartment to enhance the waterproof performance of the drive motor compartment. The water-retaining brim 132 can prevent water droplets or water flow from directly entering the gap between the upper shell 11 and the lower shell 12, forming the first waterproofing layer. The water-retaining boss 134 of the lower shell 12 can prevent water flowing along the surface of the lower shell 12 from entering the gap between the upper and lower shells, which is the second waterproofing layer. The rib 133 and the sealing strip 131 have an interference fit, which can prevent water from entering the shell 1 through the gap between the upper and lower shells, which is the third waterproofing layer. The three waterproofing devices improve the waterproof and dustproof level of the electric limiter, achieving the IP67 waterproofing standard for the drive motor compartment and the IP54 waterproofing standard for the screw compartment, thereby expanding its application areas.

[0052] Working Principle: The main body of the electric limiter is installed in the vehicle door 7, and the vehicle body fixing bracket 51 is installed on the vehicle body 8. The vehicle body fixing bracket 51 is connected to the main body of the electric limiter via a push rod 52. The extension and contraction of the push rod 52 drives the vehicle door 7 to open and close. Its function is realized as follows: the driving device 3 is energized to drive the output shaft assembly 31 to rotate. The output shaft assembly 31 is connected to the first gear shaft 411 of the gear transmission assembly 41. The gear transmission assembly 41 transmits power from the first gear shaft 411 to the screw rod 421, and the speed is adjusted to change the output torque. The third gear 415 is connected to the screw rod assembly 42 to drive the screw rod 421 to rotate. The screw rod 421 drives the push rod nut slider assembly 43 to move back and forth along the screw rod axis G. The push rod nut slider assembly 43 is connected to the push rod device 5, driving the push rod device 5 to perform back and forth telescopic movement. When push rod 52 extends, door 7 opens; when push rod 52 retracts, door 7 closes. The direction of push rod 52 extension and retraction is changed by rotating motor 32 in both directions. Push rod resistance adjustment device 2 is used to adjust the internal resistance of the electric limiter, balancing individual differences in resistance among other transmission components within the device and ensuring consistent resistance across the entire device assembly.

[0053] Advantages of the present invention include: by providing the water-retaining boss and the water-retaining brim, the first and second waterproofing layers are achieved through the shell structure itself without increasing costs; by the interference fit between the rib and the sealing strip, the third waterproofing layer is achieved; the provision of the sealing assembly improves the waterproof and dustproof level of the product, thereby expanding its scope of application. By providing the push rod resistance adjustment device, the friction resistance of the push rod can be precisely adjusted. This resistance acts directly on the push rod, effectively eliminating the invalid travel of the push rod, thereby preventing the user from feeling the door shaking during use; at the same time, this design allows the resistance of the electric limiter to be controlled within a smaller tolerance range, ensuring that the resistance felt by the user when opening and closing the door is more consistent, thereby improving the quality of the door; by providing the adjustment bolt, the resistance can be finely adjusted after assembly. The push rod adopts a core rod made of high-strength material, and a plastic-coated layer is provided on the outside of the core rod, which not only meets the strength requirements but also ensures the appearance quality; by setting the upper shell and the lower shell, and using self-tapping screws to connect the two, compared with the barrel-shaped electric limiter in the prior art, the number of screws assembled is significantly reduced, the production efficiency is improved and the installation process is simplified; at the same time, it solves the problem of large draft angle limitation in the barrel-shaped structure in the prior art, which causes the guide groove to be non-parallel before and after, and the gap between the push rod slider and the guide groove is too large, thereby causing shaking.

[0054] Advantages of the present invention include: by providing the water-retaining boss and the water-retaining brim, the first and second waterproofing layers are achieved through the shell structure itself without increasing costs; by the interference fit between the rib and the sealing strip, the third waterproofing layer is achieved; the provision of the sealing assembly improves the waterproof and dustproof level of the product, thereby expanding its scope of application. By providing the push rod resistance adjustment device, the friction resistance of the push rod can be precisely adjusted. This resistance acts directly on the push rod, effectively eliminating the invalid travel of the push rod, thereby preventing the user from feeling the door shaking during use; at the same time, this design allows the resistance of the electric limiter to be controlled within a smaller tolerance range, ensuring that the resistance felt by the user when opening and closing the door is more consistent, thereby improving the quality of the door; by providing the adjustment bolt, the resistance can be finely adjusted after assembly. The push rod is made of a core rod made of high-strength material, and a plastic coating is provided on the outside of the core rod, which not only meets the strength requirements but also ensures the appearance quality; by setting the upper shell and the lower shell, and using self-tapping screws to connect the two, compared with the barrel-shaped electric limiter in the prior art, the number of screws to be assembled is significantly reduced, the production efficiency is improved and the installation process is simplified; at the same time, it solves the problem of the large draft angle limitation in the barrel-shaped structure in the prior art, which causes the guide groove to be non-parallel before and after, and the gap between the push rod slider and the guide groove is too large, thereby causing shaking. The electric limiter for smart car doors provided by the present invention can adjust the push rod resistance after assembly is completed, thereby improving the consistency of the car door system, and at the same time, it also enhances the waterproof effect of the product, improves production efficiency, and solves the problem of the large gap between the push rod slider and the guide groove, which makes the push rod easy to shake.

[0055] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An electric limiter for an intelligent vehicle door, comprising a housing (1), wherein a driving device (3) is provided inside the housing (1), wherein an output shaft of the driving device (3) is connected to a transmission assembly (4), and the transmission assembly (4) is connected to a push rod device (5), characterized in that: A push rod resistance adjustment device (2) is provided in the housing (1), the push rod device (5) includes a push rod (52), the push rod (52) is connected to the push rod resistance adjustment device (2), the push rod resistance adjustment device (2) includes a fixed slider (21) and an adjustable slider (22), the fixed slider (21) and the adjustable slider (22) are arranged on both sides of the push rod (52) and are in surface contact with the push rod (52), wherein the end of the adjustable slider (22) away from the push rod (52) is connected to an elastic member ( 25), the other end of the elastic member (25) is connected to an adjustment assembly, the adjustment assembly includes an adjustment bolt (23) and an adjustment nut (24) fixedly arranged in the housing (1), the adjustment bolt (23) is connected to the elastic member (25), and the adjustment nut (24) is sleeved on the adjustment bolt (23), and the adjustment assembly is configured to increase or decrease the elastic potential energy of the elastic member (25) by squeezing or relaxing the elastic member (25), thereby causing the thrust applied by the elastic member (25) to the adjustable slider to increase or decrease, The friction between the adjustable slider (22), the fixed slider (21) and the push rod (52) is increased or decreased to adjust the travel resistance of the push rod; the driving device (3) drives the push rod device (5) to perform telescopic movement through the transmission assembly (4); the transmission assembly (4) includes a gear transmission assembly (41); the gear transmission assembly (41) is connected to the driving device (3); the gear transmission assembly (41) is connected to the screw assembly (42); the screw assembly (42) is provided with a push rod nut slider assembly (43); The screw assembly (42) includes a screw (421), one end of the screw (421) is connected to the housing (1) via a self-lubricating bushing (423), and the other end of the screw (421) is connected to the housing (1) via a deep groove ball bearing (422). The push rod nut slider assembly (43) includes a screw nut (431) sleeved on the screw (421), a push rod slider (432) is fixedly mounted on the screw nut (431), and the push rod slider (432) is connected to the push rod (52).

2. The electric limiter for the smart door according to claim 1, characterized in that: The push rod device (5) further comprises a vehicle body fixing bracket (51), the vehicle body fixing bracket (51) is connected to the push rod (52), and the push rod (52) is connected to the transmission assembly (4).

3. The electric limiter for the smart door according to claim 1, characterized in that: The push rod (52) comprises a core rod (521), and a plastic coating layer (522) is provided on the outer surface of the core rod (521).

4. The electric limiter for the smart door according to claim 1, characterized in that: The gear transmission assembly (41) includes a first gear shaft (411) connected to the driving device (3), a first gear (412) is sleeved on the first gear shaft (411), the first gear (412) is meshed with a second gear (413), the second gear (413) is sleeved on a second gear shaft (414), the second gear shaft (414) is arranged on the housing (1), the second gear (413) is meshed with a third gear (415), and the third gear (415) is connected to the screw assembly (42).

5. The electric limiter for the smart door according to claim 4, characterized in that: The third gear (415) is sleeved on the screw rod (421).

6. The electric limiter for an intelligent vehicle door according to any one of claims 1 to 5, characterized in that: The housing (1) comprises an upper housing (11) and a lower housing (12), wherein the upper housing is fixedly connected to the lower housing, and a sealing assembly (13) is provided between the upper housing (11) and the lower housing (12), and the sealing assembly (13) is used to prevent water from entering the interior of the housing (1).

7. The electric limiter for the smart door according to claim 6, characterized in that: The sealing assembly (13) comprises a water-retaining brim (132) arranged at the edge of the upper shell (11), and a water-retaining boss (134) arranged at the edge of the lower shell (12); the upper shell (11) is provided with a rib (133); the lower shell (12) is provided with a groove (135) at a position corresponding to the rib (133); and a sealing strip (131) is provided in the groove (135).

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