Electric supporting rod structure for automobile tail door

Abstract

The utility model relates to the technical field of automobile parts, in particular to an electric supporting rod structure for an automobile tail door, which comprises a first sleeve assembly, a second sleeve assembly, a third sleeve assembly and a fourth sleeve assembly, the second sleeve assembly is divided into a second outer sleeve and a second inner sleeve, and the outer end part of the second inner sleeve is connected with the outer end part of the first inner sleeve; the lead screw is arranged in the second outer sleeve; the lead screw nut is in threaded connection with the lead screw, the lead screw nut is limited by the second outer sleeve in the length direction of the lead screw, and the inner end of the second inner sleeve is connected with the lead screw nut; the driving device is used for driving the screw rod to rotate so as to drive the screw rod nut, the second inner sleeve and the first inner sleeve to do telescopic motion; the first ball joint is arranged at one end of the driving device; the second ball joint is arranged at the outer end part of the first inner sleeve; and the first ball socket joint and the second ball socket joint are both pin type ball socket joints. The mounting structure has the characteristics of convenience in mounting and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, and more specifically to an electric support rod structure used on a tailgate of an automobile. Background Art

[0002] Cars are the most common means of transportation for contemporary people. With the development of science and technology, people have higher and higher requirements for cars, so more and more new technologies are being applied to cars. Electric car tailgates are one of them. Electric tailgates have been favored by customers. The tailgate is driven by the electric strut of the tailgate, and the tailgate can be opened and closed automatically, which greatly improves the convenience of car use.

[0003] In some existing cars, the electric tailgate strut is generally used to achieve this. The electric tailgate strut is composed of an outer tube and an inner tube that slides with the outer tube. A transmission mechanism that drives the inner tube to slide along its axial direction is provided inside the outer tube. A motor that drives the transmission mechanism is provided at the bottom of the outer tube. In order to reduce the noise generated by the inner tube during the extension and retraction process, a bushing is provided between the inner tube and the outer tube.

[0004] The current electric tailgate struts have the following problems: 1. When the tailgate is opened, most of its weight needs to be borne by the drive device, resulting in a large load on the drive device, which can easily damage the drive device after a long time; 2. The transmission mechanism mainly adopts a screw structure, and the pre-tightening force between the screw and the nut is weak, which can easily loosen and produce abnormal noise after a long time. 3. The drive mechanism is mainly composed of a motor, a reducer and a damper, but the damper installed at the end of the reducer will take up more space. Utility Model Content

[0005] The main purpose of the utility model is to provide an electric support rod structure for a car tailgate, aiming to solve at least one technical problem mentioned in the background technology.

[0006] In order to solve the above technical problems, the utility model proposes an electric support rod for a car tailgate, comprising:

[0007] A first sleeve assembly, which is a telescopic structure and is divided into a first outer sleeve and a first inner sleeve;

[0008] A second sleeve assembly is disposed in the first sleeve assembly, is a telescopic structure, and is divided into a second outer sleeve and a second inner sleeve, wherein the outer end of the second inner sleeve is connected to the outer end of the first inner sleeve;

[0009] A screw rod is arranged in the second outer sleeve;

[0010] The screw nut is threadedly connected to the screw rod, and the screw nut is limited in the length direction of the screw rod by the second outer sleeve. The inner end of the second inner sleeve is connected to the screw nut;

[0011] And a driving device, connected to the screw rod, for driving the screw rod to rotate so as to drive the screw nut, the second inner sleeve and the first inner sleeve to perform telescopic movement;

[0012] Among them, it further includes:

[0013] A balance component for applying an outward thrust to the first inner sleeve.

[0014] In the above technical solution, further, one end of the driving device is externally connected with a first ball socket joint, and the outer end of the first inner sleeve is externally connected with a second ball socket joint;

[0015] Among them, the second ball socket joint is slidably connected to the first inner sleeve; the balance component includes:

[0016] A first limiting ring, arranged on the inner wall of the first outer sleeve;

[0017] A second limiting ring, arranged on one end of the second ball socket joint located inside the first inner sleeve;

[0018] And a balance spring, sleeved on the second sleeve assembly, and one end of it abuts against the first limiting ring, and the other end abuts against the second limiting ring, for pushing the second ball socket joint to move a part away from the first inner sleeve.

[0019] In any of the above technical solutions, further, there is a limiting sleeve arranged near the outer port on the inner wall of the first inner sleeve and an end cover arranged on its outer port. The limiting sleeve is of a hollow structure, and a spline groove is opened on the inner wall of one end of it close to the end cover;

[0020] A connecting portion is arranged on the second ball socket joint, and a spline adapted to the spline groove is arranged on the outer wall of the connecting portion;

[0021] Among them, the connecting portion passes through the end cover and is embedded into the limiting sleeve, and the spline on the connecting portion is embedded into the spline groove on the limiting sleeve;

[0022] A first connecting rib extending from the limiting sleeve is further arranged on the connecting portion, and the second limiting ring is arranged on the first connecting rib;

[0023] The limiting sleeve is connected to the outer end of the second inner sleeve through a second connecting rib.

[0024] In any of the above technical solutions, further, the balance component further includes:

[0025] A locking member for locking the second limiting ring on the second inner sleeve;

[0026] During the contraction of the second inner sleeve, the second ball socket joint abuts against the outer end of the first inner sleeve, and the locking member locks the second limiting ring on the second inner sleeve; when the second inner sleeve stops moving, the second limiting ring is disengaged from the limit of the second inner sleeve, and the second ball socket joint is subjected to the elastic force of the balance spring and moves away from the first inner sleeve.

[0027] In any of the above technical solutions, further, a connector for sealing its interior is provided on the outer end of the second inner sleeve. The connector is connected to the second connecting rib. A first installation groove is provided through the side end of the connector. A communication hole for connecting the second inner sleeve with the first installation groove is also provided on the connector, and the communication hole forms an air hole.

[0028] Wherein, a first retaining piece, a second retaining piece and a third retaining piece are sequentially arranged in the first installation groove. The chamber enclosed by the first retaining piece, the second retaining piece and the third retaining piece forms a positioning chamber; and the first retaining piece is a spring piece. Under normal conditions, the first retaining piece is inclined, so that the positioning chamber has a trapezoidal structure; after the first retaining piece is subjected to an external force that can cause it to deform, the first retaining piece is bent, so that the positioning chamber has a square structure.

[0029] Wherein, when the first inner sleeve contracts, the gas in the first inner sleeve flows out from the air hole and acts on the first retaining piece, causing the first retaining piece to deform.

[0030] The locking member is a telescopic rod provided on the inner wall of the second limiting ring. The end of the telescopic rod is embedded in the positioning chamber. When the first retaining piece is not deformed, the telescopic rod can be pushed outwards by the elastic force of the balance spring and disengaged from the positioning chamber; after the first retaining piece is deformed, the telescopic rod is locked in the positioning chamber.

[0031] In any of the above technical solutions, further, a second installation groove is provided on the inner wall of the second limiting ring. The telescopic rod includes:

[0032] A locking rod arranged in the second installation groove;

[0033] And an elastic member arranged in the second installation groove for applying a thrust to the locking rod to make one end of the locking rod extend out of the second installation groove.

[0034] Wherein, when the second inner sleeve moves so that the positioning chamber is aligned with the second installation groove, the locking rod is embedded in the positioning chamber.

[0035] In any of the above technical solutions, further, the screw nut includes:

[0036] A nut body;

[0037] A pre-tightening ring is arranged at one end of the nut body. The end of the pre-tightening ring is provided with a first opening. There are more than two first openings, which are distributed along the circumferential direction of the pre-tightening ring. A pre-tightening groove is also arranged on the outer wall of the pre-tightening ring and opens radially inwards.

[0038] And a snap ring is sleeved in the pre-tightening groove;

[0039] Wherein, the pre-tightening groove is located on the first opening, and the snap ring is used to adjust the size of the opening.

[0040] In any of the above technical solutions, further, a driving device includes:

[0041] A housing; and arranged inside the housing

[0042] An electric motor;

[0043] A speed reducer;

[0044] And a damper;

[0045] Wherein, the damper is arranged between the electric motor and the speed reducer, and is used to apply damping to the output end of the electric motor, and the speed reducer enlarges the damping; the output end of the speed reducer is connected to the lead screw; the first ball socket joint is arranged on one end of the housing close to the electric motor.

[0046] In any of the above technical solutions, further, both the first ball socket joint and the second ball socket joint are pin-type ball socket joints.

[0047] Beneficial effects: Compared with the prior art, an electric strut structure for a vehicle tailgate provided by the present application can not only support the vehicle tailgate through the balance assembly; moreover, after being compressed, at the moment when the vehicle tailgate is opened, the vehicle tailgate can achieve an ice-breaking effect.

[0048] For the transmission system thereon, by improving the lead screw nut, the pre-tightening force between the lead screw nut and the lead screw is significantly improved.

[0049] For the driving device thereon, by adjusting the position of the damper, that is, arranging it at the input end position of the speed reducer, in this way, not only can the volume of the driving device be reduced, but also the resistance generated by the damper can be amplified by the speed reducer later. After such a design, compared with the conventional electric strut, more space and production costs are saved.

[0050] By setting the pin-type ball socket, it is convenient for installation. Description of the Drawings

[0051] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0052] Figure 1 is the three-dimensional structure schematic diagram of the present invention;

[0053] Figure 2 is the internal structure schematic diagram of the present invention;

[0054] Figure 3 is Figure 2 the enlarged structure schematic diagram at position A in

[0055] Figure 4 is Figure 2 the enlarged structure schematic diagram at position B in

[0056] Figure 5 is Figure 2 the enlarged structure schematic diagram at position C in

[0057] Figure 6 is the structure schematic diagram of the second ball socket joint of the present invention away from the first inner sleeve;

[0058] Figure 7 is the structure schematic diagram of the locking member of the present invention embedded in the positioning cavity;

[0059] Figure 8 is Figure 1 the enlarged structure schematic diagram at position D in

[0060] Figure 9 is the structure schematic diagram of the deformed first retaining piece of the present invention;

[0061] Figure 10 is the connection structure schematic diagram of the lead screw and the lead screw nut of the present invention;

[0062] Figure 11 is the three-dimensional structure schematic diagram of the driving device of the present invention;

[0063] Figure 12 is the internal structure schematic diagram of the driving device of the present invention;

[0064] Figure 13 is the internal structure schematic diagram of the damper of the driving device of the present invention;

[0065] Figure 14 is the exploded structure schematic diagram of the damper of the driving device of the present invention;

[0066] Figure 15 It is a schematic structural diagram of the first ball socket joint of the present utility model;

[0067] Figure 16 It is a schematic structural diagram of the first ball socket joint from another perspective of the present utility model;

[0068] Figure 17 It is a schematic structural diagram of the circlip pin of the present utility model.

[0069] The description of the reference numerals is as follows:

[0070] 100. First sleeve assembly; 110. First outer sleeve; 120. First inner sleeve; 121. Limiting sleeve; 1211. Spline groove; 1212. Second connecting rib; 122. End cover; 200. Second sleeve assembly; 210. Second outer sleeve; 220. Second inner sleeve; 221. Connector; 2211. First installation groove; 2212. Communication hole; 222. First retaining piece; 2221. Vertical plate; 2222. Inclined plate; 2223. Horizontal plate; 223. Second retaining piece; 224. Third retaining piece; 300. Lead screw; 400. Lead screw nut; 410. Nut body; 411. Limiting projection; 420. Pre-tightening ring; 421. First opening; 422. Second opening; 430. Circlip; 500. Driving device; 510. Housing; 520. Motor; 530. Reducer; 540. Damper; 541. Damper cover; 5411. Limiting groove; 542. Driving piece; 543. Wave spring; 544. Friction plate; 5441. Limiting projection; 600. Balancing assembly; 610. First limiting ring; 620. Second limiting ring; 621. Second installation groove; 630. Balancing spring; 640. Locking member; 641. Locking rod; 642. Elastic member; 700. First ball socket joint; 710. Ball socket seat; 711. Ball head groove; 712. Strip-shaped groove; 713. Slot; 714. Limiting groove; 720. Circlip pin; 721. Frame-shaped limiting pin; 722. U-shaped limiting pin; 800. Second ball socket joint; 810. Connecting portion; 811. Spline; 812. First connecting rib. Detailed implementation manners

[0071] Next, exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. It should be understood that the present application is not limited by the exemplary embodiments described herein. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0072] It should be noted that, as shown in this application and the claims, unless the context clearly indicates otherwise, words such as "a", "an", "one", and / or "the" are not specifically singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0073] If there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0074] In the present utility model, unless otherwise clearly specified and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0075] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0076] In the electric strut system, currently most of them adopt the way of screw drive to convert rotational motion into linear motion, so that the strut can be telescoped, and then the automatic opening and closing of the vehicle tailgate can be realized. However, the balance structure, transmission mechanism, and driving mechanism of such electric struts all need to be improved. For this reason, this application proposes an electric strut for a vehicle tailgate and a vehicle including the same.

[0077] The following is a detailed description of an electric strut structure for a vehicle tailgate according to the present application through the following embodiments.

[0078] Embodiment 1:

[0079] As Figures 1 - 17 shown, in this embodiment, an electric strut structure for a vehicle tailgate includes: a first sleeve assembly 100, which is a telescopic structure and is divided into a first outer sleeve 110 and a first inner sleeve 120; a second sleeve assembly 200, disposed within the first sleeve assembly 100, which is a telescopic structure and is divided into a second outer sleeve 210 and a second inner sleeve 220, and the outer end of the second inner sleeve 220 is connected to the outer end of the first inner sleeve 120; a lead screw 300, disposed within the second outer sleeve 210; a lead screw nut 400, threadedly connected to the lead screw 300, and the lead screw nut 400 is limited by the second outer sleeve 210 along the length direction of the lead screw 300, and the inner end of the second inner sleeve 220 is connected to the lead screw nut 400; and a driving device 500, connected to the lead screw 300, for driving the lead screw 300 to rotate to drive the lead screw nut 400, the second inner sleeve 220, and the first inner sleeve 120 to perform telescopic movement. One end of the driving device 500 is externally connected with a first ball socket joint 700, and the outer end of the first inner sleeve 120 is externally connected with a second ball socket joint 800;

[0080] Among them, it further includes: a balance assembly 600, for applying an outward thrust to the first inner sleeve 120.

[0081] In this embodiment, the main components of the electric strut are similar to those in the prior art, and all include a first sleeve assembly 100, a second sleeve assembly 200, a lead screw 300, a lead screw nut 400, and a driving device 500, etc. By driving the lead screw 300 to rotate in different directions, the lead screw nut 400 is driven to perform a linear movement on the lead screw 300, and then the second inner sleeve 220 performs telescopic movement on the second outer sleeve 210, thereby realizing the automatic opening and closing of the vehicle tailgate.

[0082] For the balance of the vehicle tailgate, currently the conventional means is to use a relatively long spring to achieve. The elastic force of the spring is used to offset part of the weight of the vehicle tailgate, thereby reducing the load on the driving device 500. However, the performance of this structure is relatively single. In rainy and snowy weather in winter, since the vehicle tailgate is easily frozen, it is difficult to open the vehicle tailgate. For an electrically driven tailgate, if forced to open, it will cause the motor 520 to be overloaded and easily burned out. Based on this, the balance assembly 600 is optimized in this embodiment, so that it can not only balance most of the weight of the tailgate, but also through its strong elastic force after compression, enable the tailgate to achieve the effect of breaking ice, so that the tailgate can be smoothly opened, and it will not cause damage to the motor 520.

[0083] Specifically, the second ball socket joint 800 is slidably connected to the first inner sleeve 120; the balance assembly 600 includes: a first limiting ring 610 disposed on the inner wall of the first outer sleeve 110; a second limiting ring 620 disposed on one end of the second ball socket joint 800 located inside the first inner sleeve 120; and a balance spring 630 sleeved on the second sleeve assembly 200, with one end thereof abutting against the first limiting ring 610 and the other end abutting against the second limiting ring 620, for pushing the second ball socket joint 800 to move a part away from the first inner sleeve 120.

[0084] On the inner wall of the first inner sleeve 120, there is a limiting sleeve 121 disposed near its outer port and an end cap 122 disposed on its outer port. The limiting sleeve 121 is of a hollow structure, and a spline groove 1211 is formed on the inner wall of one end thereof near the end cap 122; on the second ball socket joint 800, there is a connecting portion 810, and a spline 811 adapted to the spline groove 1211 is disposed on the outer wall of the connecting portion 810; wherein, after the connecting portion 810 passes through the end cap 122, it is embedded into the limiting sleeve 121, and the spline 811 on the connecting portion 810 is embedded into the spline groove 1211 on the limiting sleeve 121.

[0085] The connecting portion 810 is further provided with a first connecting rib 812 extending from the limiting sleeve 121, and the second limiting ring 620 is disposed on the first connecting rib 812; the limiting sleeve 121 is connected to the outer end of the second inner sleeve 220 through a second connecting rib 1212.

[0086] The balance assembly 600 further includes: a locking member 640 for locking the second limiting ring 620 on the second inner sleeve 220.

[0087] Wherein, during the contraction process of the second inner sleeve 220, the second ball socket joint 800 abuts against the outer end of the first inner sleeve 120, and the locking member 640 locks the second limiting ring 620 on the second inner sleeve 220; when the second inner sleeve 220 stops moving, the second limiting ring 620 is disengaged from the limit of the second inner sleeve 220, and the second ball socket joint 800 is subjected to the elastic force of the balance spring 630 and moves away from the first inner sleeve 120.

[0088] On the outer end of the second inner sleeve 220, there is a connector 221 for sealing its interior. The connector 221 is connected to the second connecting rib 1212. A first installation groove 2211 is formed through the side end of the connector 221. The connector 221 is further provided with a communication hole 2212 for connecting the second inner sleeve 220 with the first installation groove 2211. The communication hole 2212 forms an air hole.

[0089] The first mounting groove 2211 is provided with a first baffle 222, a second baffle 223 and a third baffle 224 which are connected in sequence. The cavity enclosed by the first baffle 222, the second baffle 223 and the third baffle 224 forms a positioning cavity. The first baffle 222 is a spring sheet. Under normal conditions, the first baffle 222 is inclined, so that the positioning cavity has a trapezoidal structure. When the first baffle 222 is subjected to an external force that can cause it to deform, the first baffle 222 is bent, so that the positioning cavity has a square structure.

[0090] When the first inner sleeve 120 contracts, the gas in the first inner sleeve 120 flows out from the air hole and acts on the first baffle 222, causing the first baffle 222 to deform.

[0091] The locking member 640 is a telescopic rod arranged on the inner wall of the second limiting ring 620, and the end of the telescopic rod is embedded in the positioning cavity. When the first baffle 222 is not deformed, the telescopic rod can be pushed outward by the elastic force of the balance spring 630 and disengage from the positioning cavity; after the first baffle 222 is deformed, the telescopic rod is locked in the positioning cavity.

[0092] The biggest difference between the balancing assembly 600 in the present application and the prior art is that by setting a first limiting ring 610, a second limiting ring 620, a balancing spring 630 and a locking member 640, and then slidingly setting the second ball joint 800 and the end of the first inner sleeve 120, it is achieved that the balancing spring 630 can not only support the tailgate of the car, but also after being compressed, at the moment the tailgate of the car is opened, the compressed elastic force can enable the tail of the car to break the ice, that is, the tailgate of the car is quickly popped outward by a small displacement with a large external force.

[0093] When the tailgate of the car needs to be opened, firstly, a start signal is sent to the driving device 500 by pressing the switch button on the tailgate or by using the key or the control button in the car body. At the same time, the lock system between the tailgate and the car body is opened, and the compressed balance spring 630 applies an outward thrust to the second limit ring 620, so that the telescopic rod gradually moves from the first baffle 222 in the positioning cavity and leaves the positioning cavity. Then, the second limit ring 620 drives the second ball joint 800 to move outward a certain distance, so that the tailgate is bounced open. In rainy and snowy weather, the external force of the tailgate bouncing outward achieves an ice-breaking effect.

[0094] At the same time, after receiving the signal, the driving device 500 controls the screw rod 300 to rotate, so that the second inner sleeve 220 extends outward. At this time, the second inner sleeve 220 drives the first inner sleeve 120 to extend outward synchronously through the limiting sleeve 121, and pushes the second ball joint 800 and the tailgate to gradually open outward. In the process of opening the tailgate to the maximum opening, the weight of the tailgate causes the second ball joint 800 to gradually move toward the first inner sleeve 120 and gradually abut against the first inner sleeve 120. In this process, the telescopic rod on the second limiting ring 620 slides on the outer surface of the connecting head 221 of the second inner sleeve 220 and gradually embeds into the positioning cavity.

[0095] When the tailgate of the car needs to be closed, the switch button on the tailgate is pressed or a closing signal is sent to the driving device 500 through a key or a control button in the car body. At this time, the driving device 500 drives the screw rod 300 to rotate in the opposite direction, and the screw rod 300 drives the second inner sleeve 220 to contract until the tailgate is closed. After the tailgate is closed, the lock system between the tailgate and the car body locks the tailgate on the car body. In the process of the tailgate opening from the maximum to the closing, due to the inward contraction of the second inner sleeve 220, the air in the second inner sleeve 220 is gradually squeezed and discharged from the air hole. The gas discharged from the air hole directly acts on the first baffle 222, causing the first baffle 222 to deform, thereby causing the first baffle 222 to be deformed. 222 changes from an inclined state to a plane perpendicular to the second baffle 223, and limits the telescopic rod from being separated from the positioning cavity. When the second inner sleeve 220 is constantly contracting, the air hole will continuously discharge the compressed gas in the second inner sleeve 220 outward, thereby making the telescopic rod always confined in the positioning cavity, and the second ball joint 800 is always against the outer end of the first inner sleeve 120 until the second inner sleeve 220 stops moving and the first baffle 222 is restored, and the telescopic rod can be separated from the positioning cavity. When the second inner sleeve 220 is continuously contracted until the tailgate is closed on the vehicle body, the driving device 500 stops moving and locks the screw rod 300, and the lock system locks the tailgate on the vehicle body. When the lock system of the tailgate is opened, the thrust exerted by the compressed balance spring 630 on the second limit ring 620 enables the tailgate to be instantly opened. The distance that the door bounces outward is limited by the maximum sliding distance between the connecting portion 810 on the second ball joint 800 and the limiting sleeve 121 .

[0096] It should be noted that the second ball joint 800 is connected to the first inner sleeve 120 in the form of a spline 811 so that the second ball joint 800 can slide while limiting its rotation.

[0097] It should be noted that the abutment of the second ball joint 800 against the first inner sleeve 120 is controlled by the compression of the balance spring 630 and the weight of the tailgate. When the elastic force corresponding to the compression of the balance spring 630 is not sufficient to overcome the weight of the tailgate, the tailgate will cause the second ball joint 800 to abut against the first inner sleeve 120. For example, when the tailgate is opened to the maximum opening, the second ball joint 800 abuts against the first inner sleeve 120.

[0098] It should be noted that, regarding the structures of the first baffle 222, the second baffle 223 and the third baffle 224, the second baffle 223 and the third baffle 224 are both rectangular sheet structures. The electric support rod is placed vertically, with the first ball joint 700 facing downward and the second ball joint 800 facing upward. Taking this angle as a reference, the third baffle 224 is horizontally fixed on the inner wall of the port of the first mounting groove 2211 of the connecting head 221, and the second baffle 223 is vertically installed in the first mounting groove 2211, and its lower end is connected to the third baffle 224. The first baffle 222 is a bent structure and is divided into a vertical plate 2221, an inclined plate 2222 and a horizontal plate 2223; wherein the vertical plate 2221 is fixed to the outer end of the first mounting groove 2211, the inclined upper end of the inclined plate 2222 is connected to the lower end of the vertical plate 2221, one end of the horizontal plate 2223 is connected to the inclined lower end of the vertical plate 2221, and the upper end of the air hole is directly opposite to the horizontal plate 2223. When the first baffle 222 is in a normal state, the inclined lower end of the inclined plate 2222 abuts against the second baffle 223. At this time, if the telescopic rod is embedded in the positioning cavity, the telescopic rod can be separated from the positioning cavity upward along the inclined plate 2222; when the gas discharged from the air hole acts on the horizontal plate 2223, the horizontal plate 2223 drives the inclined plate 2222 to move upward, so that the inclined plate 2222 and the vertical plate 2 The angle between 221 gradually becomes smaller until it tends to be vertical. At this time, if the telescopic rod is embedded in the positioning cavity, the telescopic rod will be limited and cannot escape from the positioning cavity. That is to say, when the second inner sleeve 220 is in the process of contraction, the gas in the second inner sleeve 220 will be continuously discharged from the air hole and act on the cross plate 2223, causing the inclined plate 2222 to deform. When the second inner sleeve 220 is stationary, the air hole can no longer discharge gas to the outside. At this time, the inclined plate 2222 is restored, so that the second limiting ring 620 is separated from the limiting of the telescopic rod and a force storage effect is achieved. When the lock system on the tailgate is opened, the balance spring 630 pushes the second limiting ring 620 upward, so that the second ball joint 800 can bounce outward, thereby causing the tailgate to bounce open.

[0099] It should be noted that a second mounting groove 621 is formed on the inner wall of the second limiting ring 620, and the telescopic rod includes: a locking rod 641, which is disposed in the second mounting groove 621; and an elastic member 642, which is disposed in the second mounting groove 621 and is used to apply a thrust to the locking rod 641 so that one end of the locking rod 641 extends out of the second mounting groove 621;

[0100] Wherein, when the second inner sleeve 220 moves so that the positioning cavity is aligned with the second mounting groove 621, the locking rod 641 is inserted into the positioning cavity.

[0101] When the first flap 222 is not deformed, after the locking rod 641 is inserted into the positioning cavity, if an upward thrust is applied to the second limiting ring 620, the locking rod 641 will move upward along the inclined plate 2222 on the first flap 222 and compress the elastic member 642. The locking rod 641 can disengage from the positioning cavity, thereby realizing the ice-breaking effect of the balance assembly 600; when the first flap 222 is deformed, after the locking rod 641 is inserted into the positioning cavity, if an upward or downward thrust is applied to the second limiting ring 620 at this time, the end of the locking rod 641 cannot move on the inclined plate 2222 to the vertical plate 2221, thereby realizing locking the second limiting ring 620 on the connector 221, and further ensuring that when the second inner sleeve 220 shrinks, the second ball socket joint 800 can abut against the first inner sleeve 120.

[0102] Embodiment Two:

[0103] This embodiment is a further improvement based on Embodiment One.

[0104] As Figure 10 shown, in this embodiment, the lead screw nut 400 includes: a nut body 410; a preloading ring 420 disposed at one end of the nut body 410. The end of the preloading ring 420 is provided with a first opening 421. There are two or more first openings 421, which are distributed along the circumferential direction of the preloading ring 420. A preloading groove radially inwardly opened is further provided on the outer wall of the preloading ring 420; and a snap ring 430 sleeved in the preloading groove;

[0105] Wherein, the preloading groove is located on the first opening 421, and the snap ring 430 is used to adjust the size of the opening.

[0106] A preloading ring 420 is disposed at the end of the nut body 410. The preloading ring 420 is substantially an integrally formed structure with the nut body 410. By providing a plurality of circumferentially distributed openings at the end of the preloading ring 420, the end of the lead screw nut 400 can be deformed, and then the size of the opening can be adjusted through a buckle, so that the preloading force between the lead screw nut 400 and the lead screw 300 can be adjusted, ensuring the gap between the lead screw nut 400 and the lead screw 300. Even during long-term operation, the gap is not likely to increase.

[0107] It should be noted that limiting bumps 411 are provided on the outer walls of the nut body 410 and the pre-tightening ring 420. There are multiple limiting bumps 411, which are distributed along the circumferential direction. By providing the limiting bumps 411, the nut body 410 can be limited to perform linear motion on the screw rod 300 body.

[0108] In this embodiment, preferably, a plurality of second openings 422 respectively communicating with the first openings 421 are further formed in the pre-tightening ring 420;

[0109] Among them, the length direction of the first opening 421 is the same as the length direction of the pre-tightening ring 420, the length direction of the second opening 422 is the same as the circumferential direction of the pre-tightening ring 420, and the first opening 421 and the second opening 422 together form a T-shaped notch.

[0110] In this embodiment, in order to further optimize the performance and reliability of the electric tailgate strut screw rod 300 assembly, especially the design of the pre-tightening ring 420 is more carefully optimized. Specifically, in addition to the first openings 421 distributed along the circumferential direction mentioned above, a plurality of second openings 422 communicating with these first openings 421 are also cleverly formed in the pre-tightening ring 420.

[0111] The length direction of the second opening 422 is the same as the circumferential direction of the pre-tightening ring 420. This layout makes the first opening 421 and the second opening 422 together form a unique T-shaped notch structure. This T-shaped notch design cleverly balances the relationship between the strength and deformation ability of the pre-tightening ring 420. On the one hand, the mutual communication between the first opening 421 and the second opening 422 enhances the overall stability of the pre-tightening ring 420 when it is subjected to external forces, avoiding the problem of strength reduction caused by too large an opening; on the other hand, the existence of the second opening 422 provides more action points and adjustment spaces for the snap ring 430 or other adjusting elements, enabling the pre-tightening ring 420 to achieve a more flexible and precise deformation effect while maintaining strength.

[0112] Embodiment Three:

[0113] This embodiment is a further improvement made on the basis of any of the above embodiments.

[0114] As Figure 5 、 Figures 11 - 14 shown, in this embodiment, the driving device 500 includes: a housing 510; a motor 520 disposed in the housing 510; a speed reducer 530; and a damper 540;

[0115] Among them, a damper 540 is arranged between the motor 520 and the speed reducer 530, and is used to apply damping to the output end of the motor 520, and the speed reducer 530 amplifies the damping; the output end of the speed reducer 530 is connected to the lead screw 300; the first ball socket joint 700 is arranged at one end of the housing 510 close to the motor 520.

[0116] Currently, the dampers 540 on the existing speed reducers 530 are all arranged at their tails. That is to say, the output end of the motor 520 is first connected to the input end of the speed reducer 530, and the damper 540 is arranged at the output end position of the speed reducer 530. This design will increase the volume of the entire drive device 500. Therefore, the position of the damper 540 is adjusted and set at the input end position of the speed reducer 530. In this way, compared with the previous electric struts, not only can the volume of the drive device 500 be reduced, saving more space and production costs, but also the resistance generated by the damper 540 can be amplified by the speed reducer 530 subsequently, so as to more effectively reduce the impact and vibration of the inertial load of the motor 520, thereby improving the stability and service life of the drive device 500.

[0117] In this embodiment, the damper 540 includes: a damper cover 541, arranged on the end cover 122 at the output end of the motor 520, and an installation groove and a through hole penetrating the installation groove are formed on the damper cover 541; a transmission piece 542, arranged in the installation groove, the transmission piece 542 is a T-shaped hollow structure and is divided into a connecting section at the small end and a friction section at the large end, and the connecting section is connected to the output end of the motor 520; a wave spring 543, arranged at the port of the installation groove; and a friction plate 544, the friction plate 544 is an annular structure, and there are two of them, which are respectively arranged on both sides of the friction section of the transmission piece 542;

[0118] Among them, one end of the wave spring 543 abuts against the end cover 122 at the output end of the motor 520, the other end abuts against one of the friction plates 544, and applies pressure to the transmission piece 542, so that the other friction plate 544 abuts against the inner wall of the installation groove.

[0119] The damper 540 is mainly composed of a damping cover 541, a transmission plate 542, a wave spring 543 and a friction plate 544. The damping cover 541 can be detachably mounted on the end cover 122 of the output end of the motor 520 by means of bolts, screws and other connecting pieces. Then, the wave spring 543, the friction plate 544 and the transmission plate 542 are installed in the damping cover 541. The wave spring 543 applies pressure to the friction plate 544 and the transmission plate 542, so that they are pressed against the side ends of the mounting grooves of the damping cover 541. On the surface, the output end of the motor 520 then passes through the wave spring 543, the friction plate 544, and the transmission plate 542 in sequence, and is connected to the transmission plate 542. Specifically, the hollow notch on the transmission plate 542 is cross-shaped, and the output end of the motor 520 has a cross-shaped connecting portion 810 that is compatible with the cross-shaped hollow notch, so that when the output end of the motor 520 rotates, the transmission plate 542 will rotate synchronously, and the damping effect is achieved through the pressure applied by the wave spring 543.

[0120] It should be noted that in order to prevent the transmission plate 542 from driving the friction plate 544 to rotate when it rotates, a limiting groove 5411 is opened on the inner wall of the installation groove of the damping cover 541; the friction plate 544 is provided with a limiting protrusion 5441 embedded in the limiting groove 5411, and the limiting protrusion 5441 is used to limit the rotation of the friction plate 544.

[0121] Optimally, there are several limit grooves 5411, which are distributed along the circumferential direction of the inner wall of the mounting groove of the damping cover 541, and the number of protrusions on the friction plate 544 is consistent with the number of limit grooves 5411, and they correspond one to one. This arrangement allows the friction plate 544 to be evenly stressed and its service life is increased.

[0122] Embodiment 4:

[0123] This embodiment is a further improvement made on the basis of any of the above embodiments.

[0124] like Figures 15 - 17 As shown, in this embodiment, the first ball joint 700 and the second ball joint 800 are both pin-type ball joints.

[0125] Pin-type ball joint, including;

[0126] A ball socket 710, which is provided with a ball head groove 711 for accommodating a ball head and a strip groove 712 for accommodating a ball head pin. A slot 713 connected to the strip groove 712 is also provided on the side of the ball socket 710. A clamping groove 714 is provided on the end of the ball socket 710 facing away from the ball head groove 711;

[0127] And the spring pin 720, the spring pin 430 has a U-shaped structure, and is divided into a closed frame-shaped limiting pin 721 and an open U-shaped limiting pin 722;

[0128] Among them, the frame-shaped limiting pin 721 is clamped in the card slot 714 and is used to fix the entire circlip pin 720 on the ball socket seat 710; the U-shaped limiting pin 722 is inserted into the slot 713, and the two insertion parts thereon are aligned with the ball head in the ball head slot 711 for limiting.

[0129] By optimizing the slot 713, the card slot 714 on the ball socket seat 710 and the circlip pin 720, the connection strength to the ball head is improved, so that the ball head is not easily loosened in the ball socket seat 710.

[0130] Specifically, the circlip pin 720 is a U-shaped structure formed by bending a closed spring wire. First, it is bent into a square structure, and then cross-bent to form a U-shaped structure. At this time, both ends of the U-shaped structure are closed and in a frame shape, and one end is long and the other end is short. The short end forms the frame-shaped limiting pin 721, and the long end is bent inward again, changing from a frame shape to a U shape, and is a U shape with a double-pin structure.

[0131] After this setting, the frame-shaped limiting pin 721 is used to fix the entire circlip pin 720, and the U-shaped limiting pin 722 is used to limit the ball head. Compared with the prior structure, although it is only a small adjustment, it effectively improves the strength of the entire circlip pin 720, especially the connection strength between it and the ball head.

[0132] It should be noted that the distance between the two insertion parts of the U-shaped limiting pin 722 is smaller than the outer diameter of the ball head and larger than the outer diameter of the ball head pin. The ball head in the ball socket seat 710 is limited.

[0133] The above has described the embodiments of the present disclosure. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, the practical application or the improvement of the technology in the market, or to enable other ordinary technical personnel in the technical field to understand the embodiments disclosed herein.

Claims

1. An electric support rod structure for a car tailgate, characterized in that: include: A first sleeve assembly (100) which is a telescopic structure and is divided into a first outer sleeve (110) and a first inner sleeve (120); A second sleeve assembly (200) is arranged inside the first sleeve assembly (100), is a telescopic structure, and is divided into a second outer sleeve (210) and a second inner sleeve (220), wherein the outer end of the second inner sleeve (220) is connected to the outer end of the first inner sleeve (120); A screw rod (300) is disposed in the second outer sleeve (210); a screw nut (400) threadably connected to the screw (300), the screw nut (400) being limited in position along the length direction of the screw (300) by the second outer sleeve (210), and the inner end of the second inner sleeve (220) being connected to the screw nut (400); a driving device (500) connected to the screw rod (300) and used to drive the screw rod (300) to rotate, thereby driving the screw rod nut (400), the second inner sleeve (220) and the first inner sleeve (120) to perform telescopic movement; A balancing assembly (600) for applying an outward thrust to the first inner sleeve (120); A first ball joint (700) is arranged on one end of the driving device; and a second ball joint (800) disposed on the outer end of the first inner sleeve (120); Wherein, the first ball joint (700) and the second ball joint (800) are both pin-type ball joints.

2. The electric support rod structure for a car tailgate according to claim 1, characterized in that: The screw nut (400) comprises: Nut body (410); A pre-tightening ring (420) is arranged on one end of the nut body (410); a first opening (421) is provided at the end of the pre-tightening ring (420); there are more than two first openings (421) which are distributed along the circumferential direction of the pre-tightening ring (420); and a pre-tightening groove which is radially inwardly provided on the outer wall of the pre-tightening ring (420); and a retaining ring (430) sleeved in the preload groove; The pre-tightening groove is located on the first opening (421), and the clamping spring (430) is used to adjust the size of the opening.

3. The electric support rod structure for a car tailgate according to claim 1, characterized in that: The driving device (500) comprises: A housing (510); and a Motor (520); Reducer (530); and a damper (540); The damper (540) is arranged between the motor (520) and the reducer (530) and is used to apply damping to the output end of the motor (520), and the damping is amplified by the reducer (530); the output end of the reducer (530) is connected to the screw rod (300); and the first ball joint (700) is arranged on one end of the housing (510) close to the motor (520).

4. The electric support rod structure for a car tailgate as claimed in claim 1, characterized in that: The second ball joint (800) is slidably connected to the first inner sleeve (120); the balancing assembly (600) comprises: A first limiting ring (610) is arranged on the inner wall of the first outer sleeve (110); A second limiting ring (620) is arranged on one end of the second ball joint (800) located inside the first inner sleeve (120); and a balance spring (630) which is sleeved on the second sleeve assembly (200) and has one end pressed against the first limiting ring (610) and the other end pressed against the second limiting ring (620) and is used to push the second ball joint (800) to move a portion of the way away from the first inner sleeve (120).

5. The electric support rod structure for a car tailgate as claimed in claim 4, characterized in that: The inner wall of the first inner sleeve (120) is provided with a limiting sleeve (121) arranged near its outer port and an end cover (122) arranged on its outer port; the limiting sleeve (121) is a hollow structure, and a spline groove (1211) is provided on the inner wall of one end thereof near the end cover (122); The second ball joint (800) is provided with a connecting portion (810), and the outer wall of the connecting portion (810) is provided with a spline (811) adapted to the spline groove (1211); The connecting portion (810) is inserted into the limiting sleeve (121) after passing through the end cover (122), and the spline (811) on the connecting portion (810) is inserted into the spline groove (1211) on the limiting sleeve (121); The connecting portion (810) is further provided with a first connecting rib (812) extending from the limiting sleeve (121), and the second limiting ring (620) is provided on the first connecting rib (812); The limiting sleeve (121) is connected to the outer end of the second inner sleeve (220) via a second connecting rib (1212).

6. The electric support rod structure for a car tailgate as claimed in claim 5, characterized in that: The balancing assembly (600) further includes: A locking member (640) used for locking the second limiting ring (620) on the second inner sleeve (220); In which, during the contraction of the second inner sleeve (220), the second ball joint (800) abuts against the outer end of the first inner sleeve (120), and the locking member (640) locks the second limiting ring (620) on the second inner sleeve (220); when the second inner sleeve (220) stops moving, the second limiting ring (620) is disengaged from the limiting position of the second inner sleeve (220), and the second ball joint (800) is subjected to the elastic force of the balance spring (630) and moves in a direction away from the first inner sleeve (120).

7. The electric support rod structure for a car tailgate as claimed in claim 6, characterized in that: A connecting head (221) for sealing the interior of the second inner sleeve (220) is provided on the outer end portion thereof, the connecting head (221) being connected to the second connecting rib (1212), a first mounting groove (2211) penetratingly provided at the side end of the connecting head (221), and a connecting hole (2212) for connecting the second inner sleeve (220) with the first mounting groove (2211) is also provided on the connecting head (221), the connecting hole (2212) forming an air hole; Wherein, a first baffle (222), a second baffle (223) and a third baffle (224) which are connected in sequence are arranged in the first installation groove (2211); a chamber enclosed by the first baffle (222), the second baffle (223) and the third baffle (224) forms a positioning cavity; and the first baffle (222) is a spring sheet; under normal conditions, the first baffle (222) is inclined, so that the positioning cavity has a trapezoidal structure; when the first baffle (222) is subjected to an external force capable of causing deformation, the first baffle (222) is bent, so that the positioning cavity has a square structure; Wherein, when the first inner sleeve (120) contracts, the gas in the first inner sleeve (120) flows out from the air hole and acts on the first baffle (222), causing the first baffle (222) to deform; The locking member (640) is a telescopic rod arranged on the inner wall of the second limiting ring (620), and the end of the telescopic rod is embedded in the positioning cavity. When the first baffle (222) is not deformed, the telescopic rod can be pushed outward by the elastic force of the balance spring (630) and disengage from the positioning cavity; after the first baffle (222) is deformed, the telescopic rod is locked in the positioning cavity.

8. The electric support rod structure for a car tailgate as claimed in claim 7, characterized in that: A second mounting groove (621) is provided on the inner wall of the second limiting ring (620), and the telescopic rod comprises: A locking rod (641) is arranged in the second mounting groove (621); and an elastic member (642), which is disposed in the second mounting groove (621) and is used to apply a thrust to the locking rod (641) so that one end of the locking rod (641) extends out of the second mounting groove (621); Wherein, when the second inner sleeve (220) moves so that the positioning cavity is aligned with the second installation groove (621), the locking rod (641) is embedded in the positioning cavity.

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