A tailgate actuator using a built-in hysteresis motor

Abstract

The utility model relates to the technical field of automobile parts, relate to a tailgate actuator of a kind of built-in hysteresis ware motor, the utility model includes: fixed sleeve, inner motor, spring sleeve, ball head, wire harness connector;The spring sleeve is fixed in the front end of fixed sleeve, the inner motor is set in the inside of fixed sleeve, the wire harness connector is connected in the rear end of fixed sleeve and with inner motor electric connection;The output end of the inner motor is connected with screw rod assembly, the inner tube front end fixed connection ball head in the screw rod assembly, the inside of fixed sleeve is slidably arranged in the side of the inner tube;The inner motor still includes hysteresis ware structure, the non-contact brake of hysteresis ware avoids the mechanical friction of traditional brake pad, reduces noise to below 60 decibels, significantly improves user experience, while dispensing brake pad and relevant mechanical components, reduce assembly process, reduce manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and specifically to a tailgate actuator using a built-in hysteresis motor. Background Technology

[0002] With the increasing demand for intelligent and comfortable vehicles, noise control of electric tailgate actuators using built-in hysteresis motors has become a key factor affecting user experience. Currently, mainstream actuators on the market employ a drive and braking scheme combining a motor and external brake pads: after power is cut off, the brake pads achieve braking and hovering through mechanical friction pressing against each other. However, this mechanical contact generates significant noise (typically exceeding 60 decibels), and the brake pads wear down after a period of operation, making the noise even more pronounced and reducing their lifespan. The core problems of traditional solutions lie in the noise pollution caused by mechanical friction and the limited lifespan of the brake pads, making it difficult to meet the requirements of high-end models for quietness and reliability. Utility Model Content

[0003] This invention addresses the problems of existing technologies by providing a tailgate actuator that uses a built-in hysteresis motor.

[0004] The objective of this utility model can be achieved through the following technical solution: A tailgate actuator using a built-in hysteresis motor includes: a fixed sleeve, an inner motor, a spring sleeve, a ball head, and a wiring harness connector; the spring sleeve is fixed to the front end of the fixed sleeve, the inner motor is disposed inside the fixed sleeve, and the wiring harness connector is connected to the rear end of the fixed sleeve and electrically connected to the inner motor; the output end of the inner motor is connected to a lead screw assembly, the front end of the inner tube in the lead screw assembly is fixedly connected to the ball head, and one side of the inner tube is slidably disposed inside the fixed sleeve; the inner motor also includes a hysteresis structure.

[0005] In a further improvement, the inner motor also includes a stator assembly and a rotor assembly. The rotor assembly is sleeved on the motor shaft, and the stator assembly is disposed outside the rotor assembly. The hysteresis structure includes a magnetic ring and a fixed bracket. The magnetic ring is sleeved on the motor shaft of the inner motor, and the fixed bracket positions the magnetic ring between the stator assembly and the rotor assembly of the inner motor.

[0006] As a further improvement, the magnetic ring is made of a hard magnetic alloy.

[0007] In a further improvement, the lead screw assembly includes a lead screw and a nut. The lead screw is driven by the output end of the internal motor, and the nut is sleeved on the lead screw and fixedly connected to the inner tube. A reduction mechanism is provided between the output end of the internal motor and the lead screw. The output end of the reduction mechanism is a planetary gear structure, and the output end of the planetary gear structure is driven by one end of the lead screw. The output axis of the internal motor, the transmission axis of the reduction mechanism, and the axis of the lead screw are collinear. The reduction mechanism includes a first-stage gear set and a planetary gear structure that mesh sequentially. The input end of the first-stage gear set is connected to the output end of the internal motor, and the output end of the planetary gear structure is fixedly connected to the lead screw through a coupling.

[0008] In a further improvement, a return spring is provided inside the spring sleeve, and the return spring is sleeved on the outside of the inner tube.

[0009] In a further improvement, the ball joint is a universal ball joint structure, with one end hinged to the front end of the inner tube.

[0010] In a further improvement, a mounting base is provided at the rear end of the fixed sleeve, and the wire harness connector is fixed by the mounting base.

[0011] In a further improvement, a worm gear is fixedly connected to the output end of the internal motor, and the worm gear meshes with a turbine for transmission. The output end of the turbine is connected to the input end of the reduction mechanism. The planetary gear structure is driven by one end of the lead screw. The output axis of the internal motor and the axis of the lead screw are not collinear. The axis of the worm gear is perpendicular to the axis of the turbine. The turbine is connected to the input end of the reduction mechanism through a transmission shaft. The planetary gear structure includes a sun gear, planet gears, and a ring gear. The sun gear is connected to the output end of the reduction mechanism. The planet gears mesh with both the sun gear and the ring gear. The planet carrier of the planet gears is fixedly connected to one end of the lead screw.

[0012] Compared with the prior art, the advantages of this utility model using a tailgate actuator with a built-in hysteresis motor are as follows: When power is off, the hard magnetic alloy magnetic ring of the hysteresis structure generates a hysteresis resistance torque due to the hysteresis effect, which hinders the rotation of the motor shaft, thereby locking the position of the lead screw assembly and realizing tailgate braking and hovering. Moreover, the magnetic ring and the stator assembly are coupled through the air gap magnetic field, and the resistance torque can be transmitted without physical contact.

[0013] Hysteresis-based contactless braking avoids the mechanical friction of traditional brake pads, reducing noise to below 60 decibels and significantly improving the user experience. Eliminating external brake pads and related mechanical components reduces assembly steps and manufacturing costs. Furthermore, hysteresis has no wear parts, its theoretical lifespan is the same as that of the motor, and maintenance costs are reduced. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the tailgate actuator using a built-in hysteresis motor according to the present invention. Figure 2 for Figure 1 Structural diagram of the internal sectional view Figure 3 This is a schematic diagram of the tailgate actuator II using a built-in hysteresis motor according to this utility model. Figure 4 for Figure 3 Structural schematic diagram of position 1 sectional view Figure 5 for Figure 3 Schematic diagram of the structure in the second sectional view In the diagram, 1-fixed sleeve, 11-mounting base, 2-inner motor, 21-stator assembly, 22-rotor assembly, 23-motor shaft, 26-hysteresis structure, 261-magnetic ring, 262-fixed bracket, 3-spring sleeve, 31-return spring, 4-ball head, 5-wire harness connector, 6-lead screw assembly, 61-lead screw, 62-nut, 7-inner tube, 8-reduction mechanism, 9-worm gear, 10-turbine. Detailed Implementation

[0015] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; unless otherwise expressly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly, for example, they can refer to fixed connections or detachable connections, etc. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0016] The following is a description of the embodiments and appendices. Figures 1-5 The technical solution of this utility model will be further described below.

[0017] Example 1 A tailgate actuator using a built-in hysteresis motor includes a fixed sleeve 1, an inner motor 2, a spring sleeve 3, a ball head 4, and a wiring harness connector 5. The spring sleeve 3 is fixed to the front end of the fixed sleeve 1, the inner motor 2 is disposed inside the fixed sleeve 1, and the wiring harness connector 5 is connected to the rear end of the fixed sleeve 1 and electrically connected to the inner motor 2. The output end of the inner motor 2 is connected to a lead screw assembly 6, the front end of the inner tube 7 in the lead screw assembly 6 is fixedly connected to the ball head 4, and one side of the inner tube 7 is slidably disposed inside the fixed sleeve 1. The inner motor 2 also includes a hysteresis structure 26.

[0018] like Figures 1-5 As shown, the working principle of this utility model is as follows: The fixed sleeve 1 integrates an internal motor 2, a spring sleeve 3, a lead screw assembly 6, and a hysteresis structure 26. The internal motor 2 drives the internal tube 7 to move linearly through the lead screw assembly 6. The ball joint 4 connects to the tailgate to realize the opening and closing action. The hysteresis structure 26 has a built-in motor shaft 23 to provide contactless braking.

[0019] When the wiring harness connector 5 is powered on, the stator assembly 21 of the inner motor 2 generates a rotating magnetic field, and the rotor assembly 22 drives the motor shaft 23 to rotate. The motor shaft drives the lead screw 61 to rotate through the reduction mechanism 8, and the nut 62 moves linearly along the lead screw, pushing the inner tube 7 to extend or retract, thereby controlling the movement of the tailgate through the ball head 4.

[0020] When power is off, the hard magnetic alloy ring 261 of the hysteresis structure 26 generates a hysteresis resistance torque due to the hysteresis effect, which hinders the rotation of the motor shaft 23, thereby locking the position of the lead screw assembly 6 and realizing tailgate braking. The magnetic ring 261 and the stator assembly 21 are coupled through the air gap magnetic field, and the resistance torque can be transmitted without physical contact.

[0021] Hysteresis-based contactless braking avoids the mechanical friction of traditional brake pads, reducing noise to below 60 decibels and significantly improving the user experience. Eliminating external brake pads and related mechanical components reduces assembly steps and manufacturing costs. Furthermore, hysteresis has no wear parts, its theoretical lifespan is the same as the motor's, eliminating the need for periodic replacements and reducing maintenance costs.

[0022] In a further preferred embodiment, the inner motor 2 further includes a stator assembly 21 and a rotor assembly 22. The rotor assembly 22 is sleeved on the motor shaft 23, and the stator assembly 21 is disposed outside the rotor assembly 22. The hysteresis structure 26 includes a magnetic ring 261 and a fixing bracket 262. The magnetic ring 261 is sleeved on the motor shaft 23 of the inner motor 2, and the fixing bracket 262 positions the magnetic ring 261 between the stator assembly 21 and the rotor assembly 22 of the inner motor 2. When the motor shaft rotates, the magnetic ring generates magnetic domains that lag behind the change in the magnetic field due to the hysteresis effect, forming a tangential resistance torque.

[0023] As a further preferred embodiment, the magnetic ring 261 is made of a hard magnetic alloy. The high coercivity of the hard magnetic alloy material ensures that the magnetic ring maintains stable magnetic properties during repeated magnetization, and can still provide reliable braking force even in high-temperature environments.

[0024] In a further preferred embodiment, the lead screw assembly 6 includes a lead screw 61 and a nut 62. The lead screw 61 is driven by the output end of the inner motor 2, and the nut 62 is sleeved on the lead screw 61 and fixedly connected to the inner tube 7. A reduction mechanism 8 is provided between the output end of the inner motor 2 and the lead screw 61. The output end of the reduction mechanism 8 is a planetary gear structure, and the output end of the planetary gear structure is driven by one end of the lead screw 61. The output axis of the inner motor 2, the transmission axis of the reduction mechanism 8, and the axis of the lead screw 61 are collinear. The reduction mechanism 8 includes a first-stage gear set and a planetary gear structure that mesh sequentially. The input end of the first-stage gear set is connected to the output end of the inner motor 2, and the output end of the planetary gear structure is fixedly connected to the lead screw 61 through a coupling. The reduction mechanism 8 uses a first-stage gear set and a planetary gear structure connected in series. The output shaft of the inner motor 2, the transmission shaft of the reduction mechanism 8, and the axis of the lead screw 61 are collinear. The motor shaft drives the planetary gear structure after being accelerated by the first-stage gear set, and finally transmits the torque to the lead screw 61. The planetary gear structure achieves high transmission efficiency through multi-tooth meshing.

[0025] In a further preferred embodiment, a return spring 31 is provided inside the spring sleeve 3, and the return spring 31 is sleeved on the outside of the inner tube 7. It stores elastic potential energy when the tailgate is opened and releases energy to assist the inner tube 7 in retracting when closed. The spring's buffering effect reduces the mechanical impact when the tailgate closes, improving operational smoothness.

[0026] As a further preferred embodiment, the ball joint 4 is a universal ball joint structure, with one end hinged to the front end of the inner tube 7. The universal ball joint can adapt to the installation angle deviation between the tailgate and the vehicle body, eliminating the need for precise calibration and reducing assembly difficulty.

[0027] As a further preferred embodiment, the rear end of the fixed sleeve 1 is provided with a mounting base 11, and the wire harness connector 5 is fixed by the mounting base 11.

[0028] In a further preferred embodiment, the output end of the internal motor 2 is fixedly connected to a worm gear 9, which meshes with a turbine 10 for transmission. The output end of the turbine 10 is connected to the input end of the reduction mechanism 8. The planetary gear structure is connected to one end of the lead screw 61 for transmission. The output axis of the internal motor 2 is not collinear with the axis of the lead screw 61. The axis of the worm gear 9 is perpendicular to the axis of the turbine 10. The turbine 10 is connected to the input end of the reduction mechanism 8 via a transmission shaft. The planetary gear structure includes a sun gear, planet gears, and a ring gear. The sun gear is connected to the output end of the reduction mechanism 8. The planet gears simultaneously mesh with the sun gear and the ring gear. The planet carrier of the planet gears is fixedly connected to one end of the lead screw 61. The internal motor 2 is driven by the worm gear 9 meshing with the turbine 10, and the transmission shaft of the turbine 10 drives the reduction mechanism 8. The worm axis is perpendicular to the turbine axis, forming a spatial interlaced transmission, which can achieve a large transmission ratio within a limited space. The sun gear of the planetary gear structure is connected to the turbine output shaft and drives the lead screw 61 via the planet carrier. Worm gear drives offer high space utilization, making them suitable for vehicles with sensitive installation dimensions. Furthermore, the self-locking characteristic of worm gear drives prevents the tailgate from being accidentally opened by external forces.

[0029] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

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