High-efficiency light-load planetary roller screw pair structure
By using a combination of rising angle ring groove threads and thrust bearings in the planetary roller screw pair, the problem of transmission efficiency loss is solved, efficient torque transmission and bidirectional axial movement are achieved, output efficiency is improved and cost is reduced.
Patent Information
- Application Number
- CN202421611180.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-09
AI Technical Summary
The existing planetary roller screw pairs have a large loss of efficiency during transmission, and cannot achieve the efficiency of theoretically calculated values.
A high-efficiency light-load planetary roller screw pair structure is designed, and the combination of ring groove threads without rising angles and thrust bearings can achieve efficient torque transmission and bidirectional axial movement of the mechanism.
It effectively improves the transmission efficiency of the planetary roller screw pair, reduces friction loss, achieves higher output efficiency and reduces costs.
Smart Images
Figure CN222772626U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of planetary roller screw pairs, and in particular relates to a high-efficiency light-load planetary roller screw pair structure. Background Art
[0002] With the continuous development of modern manufacturing technology, the traditional manufacturing industry has undergone tremendous changes. CNC technology, mechatronics and industrial robots have been more widely used in production. At the same time, the axial load capacity, impact resistance and feed speed requirements of mechanical transmission mechanisms have been continuously improved, which has led to major changes in traditional guide mechanisms. Planetary roller screws are point contacts. The increase in contact points greatly improves the load capacity and rigidity.
[0003] In the currently commonly used planetary roller screw pair structure, the screw and roller are meshed through a thread pair, the roller and nut are also meshed through a thread pair, and the roller and the inner ring are meshed through gears. The friction torque is used to drive the rotational motion of the screw into the linear motion of the nut.
[0004] The common planetary roller screw pair has a planetary gear structure, high precision requirements and great processing difficulty, which leads to a large efficiency loss during transmission of the planetary roller screw pair, and the actual efficiency cannot reach the theoretical calculated value. Summary of the invention
[0005] The purpose of the utility model is to provide a high-efficiency light-load planetary roller screw pair structure, which effectively reduces the efficiency loss caused by the revolution in the traditional planetary roller screw pair structure, effectively improves the efficiency of the planetary roller screw pair, improves the output of the planetary roller screw pair, and saves costs.
[0006] The technical solution of the utility model is a high-efficiency planetary roller screw pair, characterized in that it includes a sleeve, a thrust bearing, a first needle bearing, a second needle bearing, a planetary roller screw, a roller, a nut, and a cover plate;
[0007] The planetary roller screw has an external thread, and the nut has an internal thread. The nut is coaxial with the planetary roller screw, and the roller is placed between the planetary roller screw and the nut. The roller is meshed with the planetary roller screw and the nut respectively through two external threads; the second needle bearing is installed at both ends of the roller and is connected to the sleeve and the cover plate respectively; the first needle bearing is installed at the outer circle of the nut and is connected to the sleeve; the thrust bearings are respectively installed in the inner holes of the sleeve and the cover plate, and are connected to the two end surfaces of the nut; the planetary roller screw is connected to the driving motor as the input end, and the roller surrounds the planetary roller screw. The planetary roller screw drives the rollers surrounding it to perform spiral transmission, converts the spiral transmission into axial displacement and transmits the force to the sleeve and the cover plate through the thrust bearings on both sides.
[0008] The external thread of the roller and the internal thread of the nut are both annular groove structures with no lead angle. The roller drives the annular groove in the nut through the annular grooves at both ends to move axially, so the relative axial displacement of the roller and the nut is zero.
[0009] The utility model has the following beneficial effects:
[0010] 1. The planetary roller screw pair of the utility model transmits torque to the nut through thread transmission, and the nut transmits thrust to the sleeve and the cover plate through the thrust bearing, thereby realizing bidirectional axial movement of the mechanism.
[0011] 2. The planetary roller screw of the utility model has an external thread, the nut has an internal thread and is coaxial with the screw, the roller is placed between the screw and the nut, and the roller has an external thread and is meshed with the screw and the nut respectively. Since the thread transmission of the utility model is point contact and the force transmission is achieved through the thrust bearing, the transmission efficiency of the planetary roller screw pair is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is an exploded view of the planetary roller screw pair of the utility model;
[0013] Figure 2 This is the structural diagram of the planetary roller screw pair of the utility model;
[0014] Figure 3 This is a schematic diagram of the motion principle of the planetary roller screw pair of the utility model;
[0015] Among them, 1-sleeve; 2-thrust bearing; 3-needle bearing one; 4-needle bearing two; 5-planetary roller screw; 6-roller; 7-nut; 8-cover plate. DETAILED DESCRIPTION
[0016] like Figure 1 , Figure 2 As shown, a high-efficiency light-load planetary roller screw pair structure includes a sleeve 1, a thrust bearing 2, a needle bearing 1 3, a needle bearing 2 4, a planetary roller screw 5, a roller 6, a nut 7, and a cover plate 8.
[0017] The planetary roller screw 5 has an external thread, the nut 7 has an internal thread and is coaxial with the planetary roller screw 5, the roller 6 is placed between the planetary roller screw 5 and the nut 7, and the roller 6 is respectively engaged with the planetary roller screw 5 and the nut 7 through two external threads; the planetary roller screw 5 is connected to the driving motor as the input end, and the planetary roller screw 5 is used as a driving structure to drive the roller 6 surrounding it to perform spiral transmission, convert the spiral transmission into axial displacement and transmit the force to the sleeve 1 and the cover plate 8 through the thrust bearings 2 on both sides. The sleeve 1 and the cover plate 8 are used to support the roller 6.
[0018] like Figure 3As shown, the utility model uses the planetary roller screw 5 as the active component, transmits the force and torque to the roller 6 through the external thread of the planetary roller screw 5, and the roller 6 transmits the force and torque to the nut 7 through its external thread. The nut 7 transmits the force to the sleeve 1 and the cover plate 8 through the thrust bearings 2 at both ends, thereby realizing the bidirectional axial movement of the mechanism.
[0019] The threads of the roller 6 and the nut 7 are both annular groove structures with no lead angle, so the relative axial displacement of the roller 6 and the nut 7 is zero.
[0020] Needle bearing 2 4 is used to reduce the friction loss between roller 6 and sleeve 1 and improve transmission efficiency; needle bearing 1 3 is used to reduce the friction loss between nut 7 and sleeve 1 and improve transmission efficiency.
Claims
1. A high-efficiency, light-load planetary roller screw pair structure, characterized in that: It comprises a sleeve (1), a thrust bearing (2), a first needle bearing (3), a second needle bearing (4), a planetary roller screw (5), a roller (6), a nut (7), and a cover plate (8); The planetary roller screw (5) has an external thread, the nut (7) has an internal thread, the nut (7) and the planetary roller screw (5) are coaxial, the roller (6) is placed between the planetary roller screw (5) and the nut (7), and the roller (6) is respectively engaged with the planetary roller screw (5) and the nut (7) through two external threads; the second needle bearing (4) is installed at both ends of the roller (6) and is respectively connected to the sleeve (1) and the cover plate (8); the first needle bearing (3) is installed at the outer circle of the nut (7) and is connected to the sleeve (1); the thrust bearing (2) They are respectively installed in the inner holes of the sleeve (1) and the cover plate (8), and are connected to the two end surfaces of the nut; the planetary roller screw (5) is connected to the driving motor as the input end, and the rollers (6) surround the planetary roller screw (5). The planetary roller screw (5) drives the rollers (6) surrounding it to perform spiral transmission, converting the spiral transmission into axial displacement and transmitting the force to the sleeve (1) and the cover plate (8) through the thrust bearings (2) on both sides.
2. A high-efficiency, light-load planetary roller screw pair structure as claimed in claim 1, characterized in that: The external thread of the roller (6) and the internal thread of the nut (7) are both annular groove structures without a lead angle. The roller (6) drives the annular groove in the nut to move axially through the annular grooves at both ends, so the relative axial displacement of the roller (6) and the nut (7) is zero.