High-stability reverse roller screw structure

Abstract

The utility model relates to the technical field of mechanical transmission, in particular to a high-stability reverse roller screw structure. The problems of poor transmission stability and short service life caused by unsmooth roller circulation, poor lubricating effect, insufficient structural strength and the like are solved. Through the design of the multiple threads, the contact area among the lead screw shaft, the pin roller and the nut sleeve is increased, the bearing capacity is improved, transmission is more stable, vibration and noise are reduced, the high-precision and high-load transmission requirements can be met, a circulating mechanism is optimally designed, it is ensured that the pin roller can smoothly and circularly roll in the nut sleeve, and the service life of the pin roller is prolonged. The inner wall of the nut sleeve is provided with a lubricating oil groove which is communicated with an external lubricating system, so that the wear resistance of the roller is improved, the friction and the wear are reduced, the energy consumption is reduced, and the service lives of the roller and the whole lead screw structure are prolonged; the outer wall of the nut sleeve is provided with reinforcing ribs, so that the service life of the whole lead screw structure is prolonged; and the reliability of the whole structure is good.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission technology, and in particular to a highly stable reverse roller screw structure. Background Technology

[0002] In the field of mechanical transmission, the lead screw and nut transmission mechanism is a commonly used device that converts rotary motion into linear motion, and it is widely used in machine tools, automated equipment and many other fields.

[0003] While traditional ball screw structures offer a certain level of transmission efficiency and precision, they are prone to issues such as ball wear and decreased transmission stability under heavy loads and high speeds, making it difficult to meet the demands of high-precision, high-load, and high-stability transmissions. Inverse roller screw structures, as a novel transmission structure, transmit power between the screw and nut via rollers, allowing them to withstand greater loads and higher speeds compared to ball screws. However, existing inverse roller screw structures still have some design flaws, such as poor roller circulation, inadequate lubrication, and insufficient structural strength, which affect their transmission stability and service life.

[0004] Therefore, there is an urgent need to design a reverse roller screw structure with higher stability to meet the needs of modern industry for high-precision and high-reliability transmission. Utility Model Content

[0005] (1) Technical problems to be solved

[0006] The purpose of this invention is to provide a highly stable reverse roller screw structure. By optimizing the structural design, the smoothness of roller circulation, the structural strength, and the lubrication effect are improved, thereby enhancing the stability and reliability of transmission, extending service life, and meeting the transmission requirements of high precision and high load.

[0007] (2) Technical solution

[0008] The technical solution of this utility model is as follows: a highly stable reverse roller screw structure, comprising a reverse roller screw structure body, including a screw shaft, rollers, a nut sleeve, end caps, and a circulation mechanism. The outer surface of the screw shaft is provided with a helical screw thread, and the inner surface of the nut sleeve is provided with a nut thread adapted to the screw thread. The rollers are disposed between the screw thread and the nut thread, and the outer surface of the rollers is provided with roller threads that mesh with both the screw thread and the nut thread. The circulation mechanism is disposed on the nut sleeve and is used to guide the rollers to circulate within the nut sleeve. End caps are respectively provided at both ends of the nut sleeve, and the end caps are fixedly connected to the nut sleeve by bolts. The end caps are provided with guide grooves for guiding the rollers into and out of the circulation mechanism.

[0009] Furthermore, the lead screw thread, nut thread, and roller thread are all multi-start threads. The design of multi-start threads can increase the contact area and improve the smoothness of transmission and load-bearing capacity.

[0010] Furthermore, the circulation mechanism includes a circulation channel provided on the side wall of the nut sleeve and guide grooves provided at both ends of the circulation channel. The guide grooves are threadedly connected to the nut, and the rollers enter the circulation channel through the guide grooves to achieve cyclic rolling, thus ensuring the continuity of transmission.

[0011] Furthermore, the roller is made of high-strength alloy steel, and its surface is hardened, which improves the wear resistance and fatigue strength of the roller and extends its service life.

[0012] Furthermore, the inner wall of the nut sleeve is provided with a lubricating oil groove, which is connected to the external lubrication system, so as to lubricate the contact parts between the roller, the lead screw shaft, and the nut sleeve in a timely manner, thereby further reducing friction and wear.

[0013] Furthermore, each end of the lead screw shaft is provided with a support seat, and the support seat is provided with a bearing for supporting the lead screw shaft. The bearing is a high-precision angular contact ball bearing.

[0014] Furthermore, the outer wall of the nut sleeve is provided with reinforcing ribs, which are evenly distributed inside the nut sleeve along the circumferential direction.

[0015] (3) Beneficial effects

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This invention increases the contact area between the lead screw shaft, rollers, and nut sleeve through the design of multi-start threads, thereby improving the load-bearing capacity, making the transmission smoother, reducing vibration and noise, and meeting the transmission requirements of high precision and high load. The optimized circulation mechanism ensures that the rollers can circulate smoothly inside the nut sleeve, avoiding roller jamming or blockage, ensuring the continuity and stability of the transmission, and improving transmission efficiency.

[0018] The rollers are made of high-strength alloy steel and have undergone surface hardening treatment. The inner wall of the nut sleeve is equipped with a lubricating oil groove that is connected to the external lubrication system, which improves the wear resistance of the rollers, reduces friction and wear, reduces energy consumption, and extends the service life of the rollers and the entire lead screw structure.

[0019] The lead screw shaft is supported by high-precision angular contact ball bearings at both ends, and the outer wall of the nut sleeve is reinforced with ribs, which improves the stability and rigidity of the lead screw shaft and nut sleeve, ensures the accuracy of transmission, and enhances the reliability of the entire lead screw structure. Attached Figure Description

[0020] Figure 1The diagram shown is an overall structural assembly diagram of this utility model;

[0021] Figure 2 The view shown is an overall structural view of this utility model;

[0022] Figure 3 The view shown is an internal structural view of the nut sleeve in this utility model;

[0023] Figure 4 The view shown is an overall structural view of this utility model.

[0024] Explanation of reference numerals in the attached diagram: 1. Lead screw shaft; 2. Nut sleeve; 3. Roller; 4. End cap; 5. Nut thread; 6. Roller thread; 7. Circulation mechanism; 8. Lead screw thread. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Example 1:

[0027] Please see Figure 1-4 This utility model provides an embodiment: a highly stable reverse roller screw structure, including a reverse roller screw structure body, comprising a screw shaft 1, rollers 3, a nut sleeve 2, end caps 4, and a circulation mechanism 7. The outer surface of the screw shaft 1 is provided with a helical screw thread 8, and the inner surface of the nut sleeve 2 is provided with a nut thread 5 adapted to the screw thread 8. The rollers 3 are disposed between the screw thread 8 and the nut thread 5, and the outer surface of the rollers 3 is provided with roller threads 6 that mesh with both the screw thread 8 and the nut thread 5. The circulation mechanism 7 is disposed on the nut sleeve 2 and is used to guide the rollers 3 to circulate inside the nut sleeve 2. End caps 4 are respectively provided at both ends of the nut sleeve 2, and the end caps 4 are fixedly connected to the nut sleeve 2 by bolts. The end caps 4 are provided with guide grooves for guiding the rollers 3 into and out of the circulation mechanism 7. Through the multi-start thread design, the contact area between the screw shaft 1, rollers 3, and nut sleeve 2 is increased, the load-bearing capacity is improved, the transmission is made smoother, vibration and noise are reduced, and the transmission requirements of high precision and high load are met.

[0028] The screw thread 8, nut thread 5, and roller thread 6 are all multi-start threads. The design of multi-start threads can increase the contact area, improve the smoothness of transmission and load-bearing capacity, and at the same time make the transmission smoother and reduce vibration and noise during the transmission process.

[0029] The circulation mechanism 7 includes a circulation channel on the side wall of the nut sleeve 2 and guide grooves at both ends of the circulation channel. The guide grooves are connected to the nut thread 5. The roller 3 enters the circulation channel through the guide grooves. This design of the circulation mechanism 7 can ensure that the roller 3 circulates smoothly inside the nut sleeve 2, avoids the roller 3 from getting stuck or blocked, and ensures the continuity and stability of the transmission.

[0030] The roller 3 is made of high-strength alloy steel and its surface is hardened. The high-strength alloy steel ensures that the roller 3 has high strength and toughness and can withstand large loads. The surface hardening treatment improves the wear resistance of the roller 3, extends the service life of the roller 3, and thus improves the stability and reliability of the entire screw structure.

[0031] The inner wall of the nut sleeve 2 is provided with a lubricating oil groove, which is connected to the external lubrication system. This groove can lubricate the contact parts between the roller 3, the lead screw shaft 1, and the nut sleeve 2 in a timely manner. Good lubrication can reduce the coefficient of friction, reduce wear, reduce energy consumption, and at the same time remove the heat generated during the transmission process, preventing the components from being damaged due to overheating, and further improving the stability and service life of the lead screw structure.

[0032] The lead screw shaft 1 is provided with support seats at both ends. The support seats are provided with bearings for supporting the lead screw shaft 1. The bearings are high-precision angular contact ball bearings. The high-precision angular contact ball bearings can accurately support the lead screw shaft 1, ensure the rotational accuracy of the lead screw shaft 1, and at the same time, can withstand large radial and axial loads, improve the stability and rigidity of the lead screw shaft 1, and ensure the accuracy of transmission.

[0033] The outer wall of the nut sleeve 2 is provided with reinforcing ribs, which are evenly distributed inside the nut sleeve 2 along the circumference. The setting of the reinforcing ribs effectively enhances the structural strength and rigidity of the nut sleeve 2, reduces the deformation of the nut sleeve 2 under stress, and improves the stability and reliability of the entire screw structure.

[0034] It should be noted that, based on Embodiment 1, the dimensions, precision, and other parameters of components such as the lead screw shaft 1, nut sleeve 2, and rollers 3 can be appropriately adjusted according to actual application requirements. For example, for applications requiring higher load-bearing capacity, the number of rollers 3 can be increased, the diameter of rollers 3 can be enlarged, and the parameters of the lead screw thread 8, nut thread 5, and roller thread 6 can be adjusted accordingly. For applications requiring higher precision, the machining accuracy can be further improved, and higher precision bearings and other components can be used to meet specific usage requirements.

[0035] Through the above embodiments, the high-stability reverse roller screw structure of the present invention can achieve high-precision, high-load, and high-stability transmission, and is widely used in machine tools, automation equipment, aerospace and other fields, with good application prospects and promotion value.

[0036] Through the above steps, in the actual manufacturing process, firstly, the lead screw shaft 1 is machined, and a helical multi-start lead screw thread 8 is machined on the outer surface of the lead screw shaft 1 using a high-precision machining process. Next, the nut sleeve 2 is machined, and a multi-start nut thread 5 adapted to the lead screw thread 8 is machined on the inner surface of the nut sleeve 2. Simultaneously, a lubricating oil groove is machined on the inner wall of the nut sleeve 2, and an interface for connection to an external lubrication system is reserved. The roller 3 is made of high-strength alloy steel, manufactured through forging and machining processes to improve its surface hardness and wear resistance. The machined roller 3 is placed between the lead screw thread 8 and the nut thread 5, so that the roller thread 6 meshes with the lead screw thread 8 and the nut thread 5. A circulation channel is machined on the side wall of the nut sleeve 2, and guide grooves are machined at both ends of the circulation channel, connecting the guide grooves to the nut thread 5 to form a complete circulation mechanism 7. End caps 4 are installed at both ends of the nut sleeve 2, and the end caps 4 are fixedly connected to the nut sleeve 2 with bolts to ensure a firm connection. Guide grooves are machined on the end cap 4 to guide the rollers 3 into and out of the circulation mechanism 7, ensuring that the rollers 3 can smoothly circulate inside the nut sleeve 2. Support seats are installed at both ends of the lead screw shaft 1, and high-precision angular contact ball bearings are installed on the support seats. The lead screw shaft 1 is installed in the bearings to ensure that the lead screw shaft 1 can rotate accurately. Reinforcing ribs are welded or installed on the outer wall of the nut sleeve 2 by other means. The reinforcing ribs are evenly distributed along the circumference of the nut sleeve 2 to enhance the structural strength of the nut sleeve 2. The external lubrication system is connected to the lubrication oil groove on the inner wall of the nut sleeve 2 to ensure that the lubrication system can supply lubricating oil to the contact parts between the rollers 3 and the lead screw shaft 1 and the nut sleeve 2 in a timely manner to achieve a good lubrication effect.

[0037] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A highly stable inverse roller screw structure, comprising an inverse roller (3) screw structure body, characterized in that: The system includes a lead screw shaft (1), rollers (3), a nut sleeve (2), end caps (4), and a circulation mechanism (7). The outer surface of the lead screw shaft (1) is provided with a helical lead screw thread (8), and the inner surface of the nut sleeve (2) is provided with a nut thread (5) that matches the lead screw thread (8). The rollers (3) are disposed between the lead screw thread (8) and the nut thread (5), and the outer surface of the rollers (3) is provided with roller threads (6) that mesh with both the lead screw thread (8) and the nut thread (5). The circulation mechanism (7) is disposed on the nut sleeve (2) and is used to guide the rollers (3) to circulate inside the nut sleeve (2). The two ends of the nut sleeve (2) are respectively provided with end caps (4), and the end caps (4) are fixedly connected to the nut sleeve (2) by bolts. The end caps (4) are provided with guide grooves for guiding the rollers (3) to enter and leave the circulation mechanism (7).

2. The high-stability inverse roller screw structure according to claim 1, characterized in that: The lead screw thread (8), nut thread (5) and roller thread (6) are all multi-start threads.

3. The high-stability inverse roller screw structure according to claim 1, characterized in that: The circulation mechanism (7) includes a circulation channel on the side wall of the nut sleeve (2) and guide grooves at both ends of the circulation channel. The guide grooves are connected to the nut thread (5), and the roller (3) enters the circulation channel through the guide grooves.

4. The high-stability inverse roller screw structure according to claim 1, characterized in that: The roller (3) is made of high-strength alloy steel and its surface is hardened.

5. The high-stability inverse roller screw structure according to claim 1, characterized in that: The inner wall of the nut sleeve (2) is provided with a lubricating oil groove, which is connected to the external lubrication system and can lubricate the contact parts between the roller (3), the lead screw shaft (1), and the nut sleeve (2) in a timely manner.

6. The high-stability inverse roller screw structure according to claim 1, characterized in that: The lead screw shaft (1) is provided with support seats at both ends, and the support seats are provided with bearings for supporting the lead screw shaft (1). The bearings are high-precision angular contact ball bearings.

7. The high-stability inverse roller screw structure according to claim 1, characterized in that: The outer wall of the nut sleeve (2) is provided with reinforcing ribs, which are evenly distributed inside the nut sleeve (2) along the circumferential direction.

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