Planetary roller bearing and planetary roller screw rod combined mechanism assembly
Through the combined mechanism of planetary roller bearings and planetary roller screws, the problem of insufficient rigidity and load capacity of angular contact ball bearings under high speed rotation and high load is solved, and efficient radial and axial bearing capacity is achieved. In miniaturized equipment, transmission efficiency and load-bearing capacity are improved.
Patent Information
- Application Number
- CN202421018468.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-11
AI Technical Summary
Existing angular contact ball bearings lack rigidity and load capacity under high-speed rotation and high load conditions, especially when they are subjected to impact loads, and the individual axial load has weak load capacity, making it difficult to meet the miniaturized electric cylinders and connecting rod mechanisms. and high load bearing requirements for equipment such as thrusters.
Using a combined mechanism assembly of planetary roller bearings and planetary roller screws, the design of the annularly arranged rollers and screw rollers combined with the rotating shaft is used to achieve efficient transmission using 90° triangular threads and smooth sections, which increases the Radial and axial load-bearing capacity and improve load-bearing capacity by adjusting the number of rollers.
It realizes a combination of high load-bearing capacity and small size, greatly improving the load-bearing capacity, suitable for miniaturized structures, transmission efficiency can reach 80% to 95%, and is suitable for equipment such as electric cylinders, connecting rod mechanisms and thrusters.
Smart Images
Figure CN222254943U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of servo motors, and in particular relates to a combined mechanism assembly of a planetary roller bearing and a planetary roller screw. Background Art
[0002] Angular contact ball bearings are a commonly used rolling bearing, the contact angle between the inner ring and the outer ring is usually 15° or 25°. This design enables the bearing to withstand axial loads and radial loads from both directions, while having high rigidity and load-bearing capacity.
[0003] Angular contact ball bearings are usually used in applications that require high-speed rotation and high precision, such as machine tools, automotive transmission systems, aerospace equipment, etc. Due to their design characteristics, angular contact ball bearings can maintain stability at high speeds while being able to withstand large loads.
[0004] However, with the development of society, the speed of large-load and miniaturization of equipment such as electric cylinders, connecting rod mechanisms, and thrusters has accelerated. Angular contact ball bearings are gradually insufficient in rigidity and load-bearing capacity. In particular, they are easily damaged when subjected to impact loads. Their weak ability to carry axial loads alone restricts their use.
[0005] Therefore, it is necessary to develop a transmission assembly structure that can withstand both radial and axial forces, can be used on miniaturized electric cylinders, connecting rod mechanisms, thrusters and other equipment, and has a large load-bearing capacity, to replace the transmission assembly structure using angular contact ball bearings. Utility Model Content
[0006] In order to solve the deficiencies of the prior art, the utility model provides a combined mechanism assembly of a planetary roller bearing and a planetary roller screw.
[0007] In order to achieve the above technical purpose, the technical solution adopted by the utility model is:
[0008] A combined mechanism assembly of a planetary roller bearing and a planetary roller screw comprises a planetary roller bearing unit, a planetary roller screw unit and a rotating shaft. The planetary roller bearing unit comprises a bearing shell and a bearing roller. There are a plurality of bearing rollers which are arranged in an annular manner in the bearing shell. The bearing rollers and the bearing shell can be rotatably matched. The rear end of the rotating shaft penetrates into the annular structure composed of the bearing rollers. The axis of the rotating shaft is parallel to the axis of each bearing roller. The bearing roller is provided with a bearing roller thread with a helix angle of zero. The rear end of the rotating shaft is provided with a first rotating shaft thread with a helix angle of zero. The first rotating shaft thread The planetary roller screw unit includes a slider housing and a screw roller, which are arranged in a ring inside the slider housing. Both ends of the screw roller are positioned inside the slider housing and the screw roller can rotate inside the slider housing. The middle of the rotating shaft passes through the annular structure composed of the screw rollers. The axis of the rotating shaft is parallel to the axis of each screw roller. The screw roller is provided with a screw roller thread with a non-zero helix angle. The middle and front end of the rotating shaft are provided with a second rotating shaft thread with a non-zero helix angle. The second rotating shaft thread and the screw roller thread are engaged with each other.
[0009] To optimize the above technical solutions, the specific measures taken also include:
[0010] The above-mentioned planetary roller bearing unit also includes a bearing retainer and a bearing outer ring. There are two bearing retainers, one in front and one in the back, which clamp the two ends of the bearing roller. The bearing roller can rotate relative to the bearing retainer. The bearing outer ring is sleeved on the outside of the two bearing retainers to fix the positions of the two bearing retainers. At the same time, the inner surface of the bearing outer ring is provided with a bearing outer ring thread that interlocks with the bearing roller thread. The bearing outer ring and the bearing roller can be rotatably matched, and the bearing outer ring is installed on the inner side of the bearing housing.
[0011] The front and rear sides of the bearing housing are both provided with openings, wherein the front side opening is for the shaft to penetrate, and the rear side opening is for the external motor shaft to penetrate.
[0012] The rear end of the rotating shaft is provided with a rotating shaft bayonet, and the rotating shaft bayonet is used to connect with an external motor shaft.
[0013] The above-mentioned planetary roller screw unit also includes a screw roller retainer, there are two screw roller retainers, one in front and one in the back clamping the two ends of the screw roller, the screw roller can rotate relative to the screw roller retainer, the screw roller retainer is fixed to the inner side of the slider housing, and the inner side of the slider housing is provided with a slider housing thread that interlocks with the screw roller thread.
[0014] The slider housing is provided with a fixing ring body, and the fixing ring body is used to be connected with an external push rod.
[0015] The bearing roller thread and the first shaft thread are both triangular threads with a tooth angle of 90°.
[0016] The screw roller thread and the second shaft thread are both triangular threads with a tooth angle of 90°.
[0017] The above-mentioned bearing outer ring includes an upper bearing outer ring assembly and a lower bearing outer ring assembly. The upper bearing outer ring assembly and the lower bearing outer ring assembly are both arc-shaped parts. The upper bearing outer ring assembly and the lower bearing outer ring assembly embrace each other to form a cylindrical structure, wrapping the bearing roller in the bearing outer ring.
[0018] The rotating shaft is provided with a smooth section between the first rotating shaft thread and the second rotating shaft thread, and the surface of the smooth section has no thread.
[0019] Compared with the prior art, the beneficial effects of the utility model are:
[0020] 1. The utility model is a combination of a planetary roller bearing and a planetary roller screw. This structure has the advantages of high load-bearing capacity and small size. It can withstand radial force and axial force. Compared with the traditional force transmission structure, it greatly reduces the size and greatly improves the load-bearing capacity. It can be applied to smaller and larger load-bearing structural configurations, including electric cylinders, connecting rod mechanisms, thrusters and other mechanisms, allowing more mechanisms to achieve large loads and miniaturization; and the number of rollers can be selected according to different loads to improve the load-bearing capacity.
[0021] 2. The structure of the utility model mainly drives the screw roller to rotate and revolve when the shaft rotates, and promotes the planetary roller screw assembly to move back and forth, thereby promoting the mechanism installed on the slider housing to transmit. The efficiency of the planetary assembly screw can reach 80% to 95%, and this mechanism can perform efficient transmission movement. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a schematic diagram of the external structure of the utility model;
[0023] Figure 2 yes Figure 1 Left view of
[0024] Figure 3 yes Figure 1 Right view of;
[0025] Figure 4 yes Figure 1 Stereoscopic image of
[0026] Figure 5 yes Figure 1 EE cross-sectional view;
[0027] Figure 6 It is an exploded schematic diagram of a planetary roller bearing unit.
[0028] The figures are marked as: planetary roller bearing unit 1, bearing housing 11, bearing roller 12, bearing retainer 13, bearing outer ring 14, upper bearing outer ring assembly 14a, lower bearing outer ring assembly 14b, planetary roller screw unit 2, slider housing 21, screw roller 22, screw roller retainer 23, fixed ring body 24, rotating shaft 3, rotating shaft bayonet 31. DETAILED DESCRIPTION
[0029] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.
[0030] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.
[0031] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.
[0032] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation, and may represent the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or units (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" / "several" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships, for example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.
[0033] The combined mechanism assembly of the planetary roller bearing and the planetary roller screw of this embodiment has a structure as follows: Figure 1-6 As shown, it mainly includes a planetary roller bearing unit 1, a planetary roller screw unit 2 and a rotating shaft 3.
[0034] The planetary roller bearing unit 1 includes a bearing housing 11, bearing rollers 12, a bearing retainer 13, a bearing outer ring 14 and other components. There are 6 bearing rollers 12, which are arranged in a ring in the bearing housing 11. The bearing rollers 12 and the bearing housing 11 can be rotatably matched. There are two bearing retainers 13, one in front and one in the back, which clamp the two ends of the bearing rollers 12. The bearing rollers 12 can rotate relative to the bearing retainer 13. The bearing outer ring 14 is sleeved on the outside of the two bearing retainers 13 to fix the positions of the two bearing retainers 13. At the same time, the inner surface of the bearing outer ring 14 is provided with a bearing outer ring thread that is engaged with the bearing roller thread. The bearing outer ring 14 includes an upper bearing outer ring component 14a and a lower bearing outer ring component 14b. The upper bearing outer ring component 14a and the lower bearing outer ring component 14b are both arc-shaped parts. The upper bearing outer ring component 14a and the lower bearing outer ring component 14b embrace to form a cylindrical structure, and the bearing rollers 12 are wrapped in the bearing outer ring 14.
[0035] The planetary roller screw unit 2 includes components such as a slider housing 21, a screw roller 22 and a screw roller retainer 23. There are 6 screw rollers 22, which are arranged in a ring in the slider housing 21. Both ends of the screw roller 22 are positioned in the slider housing 21 and the screw roller 22 can rotate in the slider housing 21. There are two screw roller retainers 23, one in front and one in the back, which clamp the two ends of the screw roller 22. The screw roller 22 can rotate relative to the screw roller retainer 23, and the screw roller retainer 23 is fixed on the inner side of the slider housing 21.
[0036] The rotating shaft 3 passes through the planetary roller bearing unit 1 and the planetary roller screw unit 2. There are two sections of threads on the rotating shaft 3, the rear end is the first rotating shaft thread, the middle and front end are the second rotating shaft thread, and there is a smooth section between the two threads, and the surface of the smooth section has no threads.
[0037] The planetary roller bearing unit 1 and the planetary roller screw unit 2 are similar in their main structures, both of which have structures such as rollers and retaining cages. The difference is that the thread helix angle on the bearing roller 12 of the planetary roller bearing unit 1 is zero, and the thread helix angle at the rear end of the rotating shaft 3 is also zero, which means that when the rotating shaft 3 rotates, the bearing roller 12 and the rotating shaft 3 will not produce axial movement. The thread of the bearing roller 12 and the thread at the rear end of the rotating shaft 3 are both triangular threads with a tooth angle of 90°, which makes the rotating shaft 3 and the bearing roller 12 fully contact and engage, and the contact force transmission area between the rotating shaft 3 and the bearing roller 12 is much larger than that of the angular contact ball bearing, thereby enabling the combined mechanism assembly of the utility model to obtain extremely high radial and axial bearing capacity. The thread helix angle on the screw roller 22 of the planetary roller screw unit 2 is not zero, and correspondingly, the thread helix angle at the front end and the middle part of the shaft 3 is also not zero, which makes the screw roller 22 and the shaft 3 move axially when the shaft 3 rotates. When the shaft 3 does not move, the entire planetary roller screw unit 2 moves axially, thereby pushing the mechanism installed on the slider housing 21 to transmit. Similarly, the thread of the screw roller 22 and the thread at the front end and the middle part of the shaft 3 are triangular threads with a tooth angle of 90°. The contact force transmission area between the shaft 3 and the screw roller 22 is much larger than that of the angular contact screw, thereby making the efficiency of the planetary roller screw unit 2 of the utility model reach 80% to 95%, and performing efficient transmission movement.
[0038] In summary, the combined mechanism assembly of the planetary roller bearing and the planetary roller screw of the utility model has the advantages of high load-bearing capacity and small overall dimensions. It can withstand radial forces as well as axial forces, greatly reduces the overall dimensions and greatly improves the load-bearing capacity. It is very suitable for use in electric cylinders, connecting rod mechanisms, thrusters and other mechanisms.
[0039] The above are preferred embodiments of the present application, but those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.
[0040] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.
Claims
1. A combined mechanism assembly of a planetary roller bearing and a planetary roller screw, characterized in that: The invention comprises a planetary roller bearing unit (1), a planetary roller screw unit (2) and a rotating shaft (3), wherein the planetary roller bearing unit (1) comprises a bearing housing (11) and a bearing roller (12), wherein the bearing rollers (12) are arranged in a ring shape in the bearing housing (11), wherein the bearing rollers (12) and the bearing housing (11) are rotatably matched, wherein the rear end of the rotating shaft (3) penetrates into the ring structure formed by the bearing rollers (12), wherein the axis of the rotating shaft (3) is parallel to the axis of each bearing roller (12), wherein the bearing roller (12) is provided with a bearing roller thread with a helix angle of zero, wherein the rear end of the rotating shaft (3) is provided with a first rotating shaft thread with a helix angle of zero, wherein the first rotating shaft thread and the bearing roller thread interlock with each other. The planetary roller screw unit (2) comprises a slider housing (21) and a screw roller (22). There are a plurality of screw rollers (22) which are arranged in a ring inside the slider housing (21). Both ends of the screw rollers (22) are positioned inside the slider housing (21) and the screw rollers (22) can rotate inside the slider housing (21). The middle of the rotating shaft (3) passes through the ring structure formed by the screw rollers (22). The axis of the rotating shaft (3) is parallel to the axis of each screw roller (22). The screw roller (22) is provided with a screw roller thread with a helix angle of non-zero. The middle and front ends of the rotating shaft (3) are provided with a second rotating shaft thread with a helix angle of non-zero. The second rotating shaft thread and the screw roller thread are engaged with each other.
2. The combined mechanism assembly of a planetary roller bearing and a planetary roller screw according to claim 1, characterized in that: The planetary roller bearing unit (1) further comprises a bearing retainer (13) and a bearing outer ring (14). There are two bearing retainers (13), one in front and one in the back, which clamp the two ends of the bearing roller (12). The bearing roller (12) can rotate relative to the bearing retainer (13). The bearing outer ring (14) is sleeved on the outside of the two bearing retainers (13) to fix the positions of the two bearing retainers (13). At the same time, the inner surface of the bearing outer ring (14) is provided with a bearing outer ring thread that interlocks with the bearing roller thread. The bearing outer ring (14) and the bearing roller (12) can rotate together. The bearing outer ring (14) is installed on the inner side of the bearing housing (11).
3. The combined mechanism assembly of a planetary roller bearing and a planetary roller screw according to claim 2, characterized in that: The bearing housing (11) is provided with openings on both the front and rear sides, wherein the front side opening is for the rotating shaft (3) to penetrate, and the rear side opening is for the external motor shaft to penetrate.
4. The combined mechanism assembly of a planetary roller bearing and a planetary roller screw according to claim 3, characterized in that: A rotating shaft bayonet (31) is provided at the rear end of the rotating shaft (3), and the rotating shaft bayonet (31) is used to connect with an external motor shaft.
5. The combined mechanism assembly of a planetary roller bearing and a planetary roller screw according to claim 4, characterized in that: The planetary roller screw unit (2) further comprises a screw roller retainer (23), wherein there are two screw roller retainers (23), one fore and one for rear, for clamping the two ends of the screw roller (22), and the screw roller (22) can rotate relative to the screw roller retainer (23), and the screw roller retainer (23) is fixed to the inner side of the slider housing (21), and the inner side of the slider housing (21) is provided with a slider housing thread that interlocks with the screw roller thread.
6. The combined mechanism assembly of a planetary roller bearing and a planetary roller screw according to claim 5, characterized in that: The slider housing (21) is provided with a fixing ring body (24), and the fixing ring body (24) is used to be connected to an external push rod.
7. The combined mechanism assembly of a planetary roller bearing and a planetary roller screw according to claim 1, characterized in that: The bearing roller thread and the first shaft thread are both triangular threads with a tooth angle of 90°.
8. The combined mechanism assembly of a planetary roller bearing and a planetary roller screw according to claim 1, characterized in that: The screw rod roller thread and the second shaft thread are both triangular threads with a tooth angle of 90°.
9. The combined mechanism assembly of a planetary roller bearing and a planetary roller screw according to claim 2, characterized in that: The bearing outer ring (14) includes an upper bearing outer ring assembly (14a) and a lower bearing outer ring assembly (14b), and the upper bearing outer ring assembly (14a) and the lower bearing outer ring assembly (14b) are both arc-shaped parts. The upper bearing outer ring assembly (14a) and the lower bearing outer ring assembly (14b) embrace each other to form a cylindrical structure, and the bearing roller (12) is wrapped in the bearing outer ring (14).
10. The combined mechanism assembly of a planetary roller bearing and a planetary roller screw according to claim 1, characterized in that: The rotating shaft (3) is provided with a smooth section between the first rotating shaft thread and the second rotating shaft thread, and the surface of the smooth section has no thread.