Screw rod assembly

Abstract

The utility model relates to the technical field of automobile parts, in particular to a lead screw assembly on an electric supporting rod of an automobile tail door. The lead screw nut is in threaded connection with the lead screw body; the lead screw nut is characterized by comprising a nut body; the pre-tightening ring is arranged at one end of the nut body, two or more first openings are formed in the end of the pre-tightening ring and distributed in the circumferential direction of the pre-tightening ring, and a pre-tightening groove formed inwards in the radial direction is further formed in the outer wall of the pre-tightening ring; the snap spring is arranged in the pre-tightening groove in a sleeving manner; wherein the pre-tightening groove is located on the first opening, and the clamping spring is used for adjusting the size of the opening. Through the design of the pre-tightening ring and the clamping spring, the pre-tightening force between the lead screw and the nut is accurately adjusted and kept.

Description

Technical Field

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

[0002] Cars are the most common means of transportation for people today. 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 electric support rod drives the car tailgate, which can realize the automatic opening and closing of the car tailgate, greatly improving the convenience of car use.

[0003] In some existing cars, electric struts are generally used to achieve this. The electric struts are mostly composed of an outer tube and an inner tube that slides with the outer tube. A transmission mechanism is provided inside the outer tube to drive the inner tube to slide along its axial direction. 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] Announcement No. CN209855526U is a kind of anti-slip structure of the electric support rod of the tailgate of the car. The bearing realizes linear motion on the screw rod. However, for the entire screw rod structure, after working for a long time, the bearing and the screw rod are easy to loosen, resulting in abnormal noise. Contents of utility model

[0005] The main purpose of the utility model is to provide a screw rod assembly for an electric support rod of a car tailgate to solve the technical problems mentioned in the background technology.

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

[0007] Screw rod body;

[0008] And a screw nut, threadedly connected to the screw body; wherein the screw nut includes:

[0009] Nut body;

[0010] A pre-tightening ring is arranged on one end of the nut body, and a first opening is provided at the end of the pre-tightening ring. There are more than two first openings, which are distributed along the circumferential direction of the pre-tightening ring. A pre-tightening groove which is radially inwardly provided is also provided on the outer wall of the pre-tightening ring;

[0011] And the retaining ring is set in the preload groove;

[0012] Wherein, the preload groove is located on the first opening, and the retaining spring is used to adjust the size of the opening.

[0013] In the above technical solution, further, a plurality of second openings respectively communicating with the first openings are formed in the pre-tightening ring;

[0014] Wherein, the length direction of the first opening is consistent with the length direction of the pre-tightening ring, the length direction of the second opening is consistent with the circumferential direction of the pre-tightening ring, and the first opening and the second opening together form a T-shaped notch.

[0015] In any of the above technical solutions, further, limiting bumps are provided on the outer walls of the nut body and the pre-tightening ring, and there are a plurality of limiting bumps which are distributed along the circumferential direction.

[0016] In any of the above technical solutions, further, the pre-tightening ring and the nut body are of an integral structure.

[0017] Beneficial effects: Compared with the prior art, through the design of the pre-tightening ring and the snap ring in this application, precise adjustment and maintenance of the pre-tightening force between the lead screw and the nut are achieved. This design effectively eliminates the problems of looseness and abnormal noise caused by nut wear, and significantly improves the stability and reliability of the electric strut of the vehicle tailgate.

[0018] By introducing the second opening on the pre-tightening ring and forming a T-shaped notch structure with the first opening, double guarantees of strength and deformation ability are achieved. Description of the Drawings

[0019] In order 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 use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 is a three-dimensional structural schematic diagram of the present invention.

[0022] The description of the reference numerals in the drawings is as follows:

[0023] 100, lead screw body; 200, lead screw nut; 210, nut body; 211, limiting bump; 220, pre-tightening ring; 221, first opening; 222, second opening; 230, snap ring. Detailed Embodiments

[0024] 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 in the present invention without creative efforts belong to the scope of protection of the present invention.

[0025] It should be noted that, as shown in the present application and the claims, unless the context clearly indicates an exception, words such as "a", "an", "one", and / or "the" are not specifically singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0026] If there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0027] In the present invention, unless otherwise clearly defined 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 internal communication of 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 invention can be understood according to specific circumstances.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, then the 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, or scenario B, or the scenario where A and B are satisfied simultaneously. In addition, the technical solutions between the 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 scope of protection required by the present invention.

[0029] In an electric strut system, the lead screw assembly is a core transmission component, and its performance and stability are directly related to the operating efficiency and reliability of the entire system. Given the long-term working characteristics of electric struts under frequent start-stop, continuous load, and complex environmental conditions, extremely stringent requirements are imposed on the design and manufacture of the lead screw assembly. However, in practical applications, many electric strut systems will develop abnormal noises after being used for a period of time, which not only affects the user experience but also may indicate potential safety hazards within the system.

[0030] Specifically, as the usage time increases, the original tight fit between the nut surface and the lead screw threads gradually deteriorates due to friction and wear, resulting in an increased gap, which in turn generates vibrations and abnormal noises during operation. This loosening not only reduces the transmission efficiency but also may accelerate the wear of other components and shorten the service life of the entire electric strut system.

[0031] Therefore, this application proposes a lead screw assembly that can increase the preload force between the nut and the lead screw.

[0032] The following will detail a lead screw assembly for an electric tailgate strut of a vehicle in this application through the following embodiments.

[0033] Embodiment 1:

[0034] As Figure 1 and Figure 2 shown, in this embodiment, a lead screw assembly for an electric tailgate strut of a vehicle includes: a lead screw body 100; and a lead screw nut 200, which is threadedly connected to the lead screw body 100.

[0035] Among them, the lead screw nut 200 includes: a nut body 210; a preload ring 220, which is provided at one end of the nut body 210. The end of the preload ring 220 is provided with a first opening 221. There are two or more first openings 221, which are distributed along the circumferential direction of the preload ring 220. A preload groove is also provided on the outer wall of the preload ring 220 and opens radially inward; and a snap ring 230, which is sleeved in the preload groove.

[0036] Among them, the preload groove is located on the first opening 221, and the snap ring 230 is used to adjust the size of the opening.

[0037] A preload ring 220 is provided at the end of the nut body 210. Substantially, the preload ring 220 is an integrally formed structure with the nut body 210. By providing a plurality of circumferentially distributed openings at the end of the preload ring 220, the end of the lead screw nut 200 can be deformed, and then the size of the opening can be adjusted through a buckle, so that the preload force between the lead screw nut 200 and the lead screw can be adjusted, ensuring the gap between the lead screw nut 200 and the lead screw. Even during long-term operation, it is not easy for the gap to increase.

[0038] It should be noted that limiting bumps 211 are provided on the outer walls of the nut body 210 and the pre-tightening ring 220. There are multiple limiting bumps 211, which are distributed along the circumferential direction. By providing the limiting bumps 211, the nut body 210 can be limited, enabling it to perform linear motion on the lead screw body 100.

[0039] Embodiment Two:

[0040] This embodiment is a further improvement based on Embodiment One.

[0041] As Figure 1 and Figure 2 shown, in this embodiment, a number of second openings 222 respectively communicating with the first openings 221 are further formed on the pre-tightening ring 220;

[0042] Among them, the length direction of the first opening 221 is consistent with the length direction of the pre-tightening ring 220, and the length direction of the second opening 222 is consistent with the circumferential direction of the pre-tightening ring 220. The first opening 221 and the second opening 222 together form a T-shaped notch.

[0043] In this embodiment, in order to further optimize the performance and reliability of the electric tailgate strut lead screw assembly, especially for the design of the pre-tightening ring 220, a more detailed optimization is carried out. Specifically, in addition to the first openings 221 distributed along the circumferential direction mentioned above, a number of second openings 222 communicating with these first openings 221 are also ingeniously formed on the pre-tightening ring 220.

[0044] The length direction of the second opening 222 is consistent with the circumferential direction of the pre-tightening ring 220. This layout enables the first opening 221 and the second opening 222 to jointly form a unique T-shaped notch structure. This T-shaped notch design ingeniously balances the relationship between the strength and deformation ability of the pre-tightening ring 220. On the one hand, the mutual communication between the first opening 221 and the second opening 222 enhances the overall stability of the pre-tightening ring 220 when subjected to external forces, avoiding the problem of strength decline caused by over-large openings; on the other hand, the existence of the second opening 222 provides more acting points and adjustment spaces for the snap ring 230 or other adjusting elements, enabling the pre-tightening ring 220 to achieve more flexible and precise deformation effects while maintaining strength.

[0045] The embodiments of the present disclosure have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of 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 skill in the art to understand the embodiments disclosed herein.

Claims

1. A screw assembly, comprising: Screw body (100); and a screw nut (200) threadedly connected to the screw body (100); characterized in that: The screw nut (200) comprises: Nut body (210); A pre-tightening ring (220) is arranged on one end of the nut body (210); a first opening (221) is provided at the end of the pre-tightening ring (220); there are more than two first openings (221) distributed along the circumferential direction of the pre-tightening ring (220); and a pre-tightening groove is also provided on the outer wall of the pre-tightening ring (220) and is radially inwardly opened; and a clamping spring (230) sleeved in the pre-tightening groove; Wherein, the pre-tightening groove is located on the first opening (221), and the clamping spring (230) is used to adjust the size of the opening.

2. The screw assembly according to claim 1, characterized in that: The pre-tightening ring (220) is also provided with a plurality of second openings (222) respectively connected to the first openings (221); The length direction of the first opening (221) is consistent with the length direction of the preload ring (220), the length direction of the second opening (222) is consistent with the circumferential direction of the preload ring (220), and the first opening (221) and the second opening (222) together form a T-shaped notch.

3. The screw rod assembly according to claim 1, characterized in that: Limiting protrusions (211) are provided on the outer walls of the nut body (210) and the pre-tightening ring (220), and there are a plurality of limiting protrusions (211) distributed along the circumferential direction.

4. The screw assembly according to any one of claims 1 to 3, characterized in that: The pre-tightening ring (220) and the nut body (210) are an integral structure.

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