A double thread structure transmission screw

Abstract

The utility model relates to mechanical engineering technical field discloses a kind of transmission screw of double thread structure, including stud, the outside of stud is fixedly connected with two inner rings, the outside of inner ring is fixedly connected with thread tooth, the surface of inner ring is equipped with lubricating groove, the outside of thread tooth is movably connected with multiple ball bearings, multiple ball bearings are evenly distributed in the outer surface of thread tooth in equidistant interval mode, and extend along the helical path of thread tooth, ball bearing is steel ball bearing, and surface is polished, the radial dimension of inner ring is less than thread tooth, and the corresponding ladder groove of adaptation bolt is equipped with, axial limit is formed when the two are clamped, and the inner wall of lubricating groove is equipped with flow guide line route.In the utility model, rely on the bidirectional ladder type clamping structure of double inner ring and bolt double internal thread, can form double axial limit effect, greatly enhance the connection firmness of screw and bolt, effectively avoid the front and rear sway or deviation caused by vibration, impact during transmission.

Description

Technical Field

[0001] This utility model relates to the field of mechanical engineering technology, and in particular to a transmission screw with a double thread structure. Background Technology

[0002] Mechanical engineering technology is a comprehensive technical field that studies the design, manufacturing, operation, and maintenance of machinery. Its core is to transform abstract designs into practically applicable mechanical equipment by applying fundamental theories of mechanics, materials science, and automation. It encompasses key areas such as mechanical structure optimization, transmission system development, and processing technology improvement. From the manufacturing of precision parts to the development of heavy machinery, all rely on this technology to achieve functional implementation and performance enhancement, providing core technological support for industries such as industrial production, transportation, and energy.

[0003] Double-threaded transmission screws are a product of mechanical engineering technology applied to the transmission field. They are mechanical transmission parts with two helical grooves machined on the surface of a cylinder or cone. Compared to single-threaded screws, their double-threaded design effectively improves transmission efficiency and more stably achieves the conversion between rotary and linear motion. They are commonly found in precision machine tools, injection molding machines, and lifting equipment. Through the optimization of thread parameters and material selection using mechanical engineering technology, they meet the transmission accuracy and reliability requirements of different equipment.

[0004] However, in existing technologies, some double-threaded drive screws only achieve connection through the meshing of the double threads with the internal threads of the bolt. When the screw is subjected to axial tension or pressure, it can only rely on the friction of the thread teeth to maintain engagement, which is prone to loosening due to tooth wear, resulting in the risk of thread slippage.

[0005] Therefore, a transmission screw with a double-threaded structure is proposed to address the above problems. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a transmission screw with a double thread structure, which aims to improve the problem that some double thread transmission screws in the prior art only achieve connection through the meshing of the double thread teeth with the internal thread of the bolt, and can only rely on the friction of the thread teeth to maintain engagement. This is prone to loosening due to wear of the tooth surface, resulting in the risk of thread slippage.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A transmission screw with a double thread structure includes a stud, two inner rings are fixedly connected to the outer side of the stud, and thread teeth are fixedly connected to the outer side of the inner rings. Lubrication grooves are formed on the surface of the inner rings, and multiple balls are movably connected to the outer side of the thread teeth.

[0009] As a further description of the above technical solution:

[0010] The plurality of balls are evenly distributed on the outer surface of the thread tooth at equal intervals and extend along the helical path of the thread tooth;

[0011] As a further description of the above technical solution:

[0012] The balls are steel balls with a polished surface.

[0013] As a further description of the above technical solution:

[0014] The radial dimension of the inner ring is smaller than the thread tooth, and the adapter bolt is provided with a stepped groove, which forms an axial limit when the two are engaged.

[0015] As a further description of the above technical solution:

[0016] The inner wall of the lubrication groove is provided with flow guiding patterns to guide the lubricant to be evenly dispersed to the thread meshing area;

[0017] As a further description of the above technical solution:

[0018] The flow guide pattern is spiral-shaped and extends in the same direction as the lubrication groove;

[0019] As a further description of the above technical solution:

[0020] The outer surface of the stud is provided with an anti-corrosion coating, which is a zinc-nickel alloy anti-corrosion coating.

[0021] As a further description of the above technical solution:

[0022] The outer edge of the thread tooth is rounded to form a continuous arc transition surface.

[0023] This utility model has the following beneficial effects:

[0024] 1. In this utility model, relying on the bidirectional stepped engagement structure of double inner ring and double internal thread of bolt, a double axial limiting effect can be formed: two sets of "inner ring-thread teeth-bolt stepped groove" engage synchronously. Compared with the single limiting of single thread, it can greatly enhance the connection firmness of screw and bolt, and effectively avoid back and forth shaking or displacement caused by vibration and impact during transmission.

[0025] 2. In this utility model, the two sets of balls roll along the spiral path of their respective threads. Compared with the single thread and single set of balls, the overall friction coefficient is lower and the transmission resistance is smaller. This not only makes the bolt screwing in / out process smoother and reduces the feeling of jamming during operation, but also disperses the wear pressure and avoids the problem of shortened service life caused by excessive wear of single thread balls.

[0026] 3. In this utility model, the oil can flow into two lubrication grooves respectively, and under the guidance of the guide pattern, it evenly covers the meshing area of ​​each thread tooth, ensuring that each contact point of the double thread is fully lubricated, completely avoiding local damage caused by dry friction of a single thread, while reducing lubricant waste, lowering equipment maintenance costs, and ensuring the smoothness of long-term synchronous transmission of the double threads. Attached Figure Description

[0027] Figure 1 This is a three-dimensional schematic diagram of a transmission screw with a double-threaded structure proposed in this utility model;

[0028] Figure 2 This is a schematic diagram of the stud of a transmission screw with a double thread structure proposed in this utility model;

[0029] Figure 3 This is a schematic diagram of the thread teeth of a transmission screw with a double thread structure proposed in this utility model.

[0030] Figure 4 This is a schematic diagram of the lubrication groove of a transmission screw with a double thread structure proposed in this utility model.

[0031] Legend:

[0032] 1. Stud; 2. Thread; 3. Inner ring; 4. Lubrication groove; 5. Ball bearing. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Reference Figures 1 to 4 This utility model provides an embodiment of a transmission screw with a double-threaded structure, including a stud 1, which serves as the basic support frame for the entire transmission screw, providing a fixed carrier for the external structures and ensuring the stability of the overall structure. The outer surface of the stud 1 is provided with an anti-corrosion coating, which is a zinc-nickel alloy anti-corrosion coating, which can isolate external corrosive media such as moisture and oil, protect the surface of the stud 1 from rusting, and maintain the connection base between the stud 1 and the two inner rings 3 and the thread teeth 2, ensuring that the double-threaded transmission accuracy is not affected by corrosion. The outer side of the stud 1 is fixedly connected to two inner rings 3, which can respectively cooperate with the double internal threads of the matching bolt, providing fixed support for the thread teeth 2, and forming a two-way stepped engagement structure together with the thread teeth 2 and the bolt stepped groove.

[0035] The outer side of the inner ring 3 is fixedly connected with a threaded tooth 2, which can engage with the double internal threads of the bolt for transmission. The transmission efficiency is improved through the synergistic effect of the double threads, realizing the mutual conversion between rotary motion and linear motion. The outer edge of the threaded tooth 2 is rounded to form a continuous arc transition surface, which can prevent the bolt from being stuck by the edge of the threaded tooth 2 when screwed into the double internal threads, and prevent cracks from appearing after long-term use. The radial dimension of the inner ring 3 is smaller than that of the threaded tooth 2, and the matching bolt has a stepped groove. When the two are engaged, they form an axial limit, which can form a double axial limit effect synchronously with another inner ring 3, threaded tooth 2, and bolt stepped groove, greatly enhancing the connection firmness between the screw and the bolt, and effectively avoiding back-and-forth shaking or displacement caused by vibration and impact during transmission.

[0036] The inner ring 3 has a lubrication groove 4 on its surface, which can serve as a storage and flow channel for lubricating oil or machine oil, delivering lubricant to the meshing area of ​​the thread teeth 2 and preventing dry friction between the thread teeth 2 and the bolt internal thread. The inner wall of the lubrication groove 4 has a guide pattern, which guides the lubricant to be evenly dispersed to the meshing area of ​​the thread teeth 2. It can guide the lubricant to flow along the extension direction of the lubrication groove 4, avoid lubricant accumulation, and ensure that the lubricant evenly covers every contact point of the meshing area of ​​the thread teeth 2. The guide pattern is spiral and consistent with the extension direction of the lubrication groove 4, which can further optimize the flow path of the lubricant, so that the lubricant can be more smoothly spread to the meshing area of ​​the thread teeth 2, ensuring the smoothness of long-term synchronous transmission of the double threads.

[0037] Multiple balls 5 are movably connected to the outer side of the thread tooth 2, which can convert the sliding friction between the thread tooth 2 and the internal thread of the bolt into rolling friction, significantly reducing transmission resistance, improving the smoothness of the bolt screwing in / out, and reducing the feeling of operation jamming. The balls 5 are made of steel and have a polished surface, which can enhance the wear resistance and surface smoothness of the balls 5, further reduce the coefficient of friction, reduce the wear between the balls 5 and the internal thread of the bolt, and extend the service life of the balls 5. Multiple balls 5 are evenly distributed on the outer surface of the thread tooth 2 at equal intervals and extend along the helical path of the thread tooth 2, which can make the force more uniform when the thread tooth 2 and the bolt are engaged, disperse the wear pressure, avoid excessive wear of the balls 5 in a single area leading to a shortened service life, and at the same time ensure the stability of the dual thread transmission.

[0038] Working principle: The core of this transmission screw is a double thread design. Two independent inner rings 3 are fixed on the outside of the stud 1. Each inner ring 3 has a corresponding thread tooth 2 fixed on its outside. Through the matching structure of "double inner ring 3 + double thread tooth 2", it precisely meets the requirements of double thread transmission. The overall operation revolves around "precise transmission, reduced friction, and long-term lubrication". The synergistic effect of the double threads further improves the transmission stability and efficiency.

[0039] During assembly, the two inner rings 3 will respectively engage with the double internal threads of the matching bolt. Since the radial dimension of each inner ring 3 is smaller than the corresponding thread tooth 2, and the double internal threads of the bolt are also respectively opened with stepped grooves, the two sets of "inner ring 3-thread tooth 2-bolt stepped groove" engage synchronously to form a two-way stepped fixation, which can better avoid back and forth shaking and offset during transmission compared with single thread.

[0040] When the screw is working, the two thread teeth 2 will simultaneously engage with the double internal thread of the bolt. At this time, the steel polished balls 5 on the outside of each thread tooth 2 will play a role: the two sets of balls 5 are equally distributed along the spiral path of their respective thread teeth 2. When the bolt is screwed in / out, the balls 5 on the double thread teeth 2 roll synchronously, converting the sliding friction of the two sets of "thread teeth 2-bolt internal thread" into rolling friction. This not only greatly reduces the overall resistance and improves the smoothness of transmission, but also reduces local wear of parts and extends the service life.

[0041] To ensure that both threads are adequately lubricated, each of the two inner rings 3 has an independent lubrication groove 4. When lubricating oil or machine oil is added, the oil will flow into the two lubrication grooves 4 respectively. The spiral guide pattern on the inner wall of each groove will guide the oil along the extension direction of its respective lubrication groove 4, so that the oil is evenly spread over the meshing area of ​​the two thread teeth 2 and the bolt internal thread, ensuring that every contact point of the double threads is lubricated, preventing jamming or damage caused by dry friction of a single thread, and ensuring the smoothness of synchronous transmission of the double threads.

[0042] In addition, the outer edges of both threads 2 are rounded, and each thread 2 forms a continuous arc transition surface. When the bolt is screwed into the double internal thread, it will not be stuck by the edge of any thread 2, avoiding the risk of cracks in the thread 2 after long-term use. At the same time, the zinc-nickel alloy anti-corrosion coating on the outer surface of the stud 1 can protect the connection base between the two inner rings 3 and the double thread 2. Even in harsh environments such as humidity and oil, it can reduce the impact of stud 1 rust on the double thread transmission accuracy.

[0043] In summary, the entire screw, through the core structure of "double inner ring 3 + double thread teeth 2", combined with the coordinated operation of "two-way stepped locking position, double thread ball 5 synchronous resistance reduction, double lubrication groove 4 branch oil supply, and double thread detail protection", achieves a more efficient, stable and durable transmission function than a single thread.

[0044] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A transmission screw with a double-threaded structure, comprising a stud (1), characterized in that: The stud (1) has two inner rings (3) fixedly connected to its outer side. The outer side of the inner rings (3) is fixedly connected to threaded teeth (2). The surface of the inner rings (3) is provided with lubrication grooves (4). The outer side of the threaded teeth (2) is movably connected to multiple balls (5).

2. The transmission screw with a double-threaded structure according to claim 1, characterized in that: Multiple balls (5) are evenly distributed on the outer surface of the thread tooth (2) at equal intervals and extend along the helical path of the thread tooth (2).

3. The transmission screw with a double-threaded structure according to claim 1, characterized in that: The ball (5) is a steel ball and its surface is polished.

4. A transmission screw with a double-threaded structure according to claim 1, characterized in that: The radial dimension of the inner ring (3) is smaller than that of the thread tooth (2), and the adapter bolt is provided with a stepped groove, which forms an axial limit when the two are engaged.

5. A transmission screw with a double-threaded structure according to claim 1, characterized in that: The inner wall of the lubrication groove (4) is provided with guide lines to guide the lubricant to be evenly dispersed to the meshing area of ​​the thread teeth (2).

6. A transmission screw with a double-threaded structure according to claim 5, characterized in that: The guide pattern is spiral-shaped and extends in the same direction as the lubrication groove (4).

7. A transmission screw with a double-threaded structure according to claim 1, characterized in that: The stud (1) has an anti-corrosion coating on its outer surface, which is a zinc-nickel alloy anti-corrosion coating.

8. A transmission screw with a double-threaded structure according to claim 1, characterized in that: The outer edge of the thread tooth (2) is rounded to form a continuous arc transition surface.

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