Planetary roller screw pair roller gear structure

Abstract

The utility model discloses a kind of planetary roller screw pair roller gear structures, belong to mechanical transmission technical field, including shell, the inside of the shell is provided with installation placement groove, the inside of installation placement groove is equipped with installation thread, the inside of the shell is equipped with internal thread, the both sides of the shell are rotatably installed with synchronous gear, in the utility model, by setting internal gear, when this kind of planetary roller screw pair roller gear structure is driven by motor, main screw is driven to rotate by motive power source, and the thread raceway on the surface of main screw is engaged with thread engagement surface and rotates, thread engagement surface rotation drives the rotation of one side auxiliary rotating twisted wire, auxiliary rotating twisted wire and rotating thread are engaged with each other, drive internal gear to rotate when auxiliary rotating twisted wire rotates, increase the contact area of main screw, improve transmission efficiency, and force all rollers to rotate synchronously, avoid the motion error caused by sliding, multiple rollers are evenly distributed, jointly share axial load, significantly improve overall load capacity.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical transmission technology, and in particular relates to a planetary roller screw pair roller gear structure. Background Technology

[0002] Planetary roller screw pairs are a type of high-efficiency power transmission device, consisting of a screw, nut, planetary rollers, and a synchronization mechanism. They convert rotary motion into linear motion through the planetary revolution and rotation of the rollers around the screw. The surface contact thread meshing design significantly improves the load-bearing capacity (up to 3-5 times that of ball screws). They also feature high rigidity, micron-level precision, and long service life, and are widely used in demanding applications such as aerospace, heavy-duty machinery, and precision robotics.

[0003] The prior art discloses a utility model patent for a planetary roller screw pair roller gear structure, among which publication number CN 221647540 U's utility model patent discloses a planetary roller screw pair roller gear structure, including a screw, rollers meshing with the outer surface of the screw, and a nut meshing with the rollers. The screw pair uses 30° pressure angle gear meshing, and the circumferential transmission of the screw uses involute gear transmission. The number of rollers is odd, and the transmission is achieved by angular displacement of the rollers and the meshing gear ring or screw gear. This utility model, through special design of the roller and screw gear structure, transfers the main load-bearing area of ​​the roller thread to the fully threaded part in the middle of the roller; it uses a large module and few teeth, so that undercut does not occur when the roller gear is hobbing; when the number of rollers is odd, there is no jamming phenomenon; using an odd number of rollers can avoid the repeated occurrence of each meshing point at the same meshing point when the roller thread meshes with the screw and nut threads, which is equivalent to increasing the fatigue life of the meshing parts and thus improving the life of the screw pair.

[0004] The aforementioned utility model patent uses an odd number of rollers to avoid jamming and improve the life of the lead screw. However, under high-speed operation, the device lacks a synchronization mechanism, and the rotation frequencies of the rollers are not on the same basic line, which can easily lead to multiple rollers colliding. Therefore, improvements are needed.

[0005] Based on this, the present invention designs a planetary roller screw pair roller gear structure to solve the above problems. Utility Model Content

[0006] The purpose of this utility model is to solve the problem that the above-mentioned utility model patent uses an odd number of rollers to avoid jamming and improve the life of the lead screw. However, under high-speed operation, the device does not have a synchronization mechanism, and the rotation frequency of the rollers is not on the same basic line, which easily leads to multiple rollers colliding. Therefore, a planetary roller lead screw pair roller gear structure is proposed.

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

[0008] A planetary roller screw pair roller gear structure includes a housing, an installation slot inside the housing, an installation thread inside the installation slot, an internal thread inside the housing, and a synchronizing gear rotatably mounted on both sides of the housing.

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

[0010] A retaining ring is rotatably mounted on one end of the synchronizing gear. Multiple mounting grooves are provided inside the retaining ring, and mounting screws are provided inside the mounting grooves.

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

[0012] The synchronizing gear has a rotating thread inside, and the retaining ring has a fixing groove on one side corresponding to the synchronizing gear.

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

[0014] The mounting groove is equipped with rollers, and one side of the rollers is equipped with auxiliary rotating threads, which mesh with the rotating threads.

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

[0016] One side of the auxiliary rotating wire has a threaded engagement surface corresponding to the middle of the roller, and the inside of the outer shell is connected to the main screw corresponding to the internal thread.

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

[0018] The main lead screw has a threaded raceway on its surface, and the threaded raceway is meshed with the auxiliary rotating screw. A retaining ring is meshed with the threaded meshing surface.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0020] 1. In this utility model, by setting an internal gear and a rotating thread, when the planetary roller screw pair roller gear structure is driven by a motor, the main screw is driven to rotate by the power source, and the thread raceway on the surface of the main screw meshes and rotates with the thread meshing surface. The rotation of the thread meshing surface drives the auxiliary rotating auger on one side to rotate. The auxiliary rotating auger meshes with the rotating thread. When the auxiliary rotating auger rotates, it drives the internal gear to rotate, increasing the contact area of ​​the main screw, improving the transmission efficiency, and forcing all rollers to rotate synchronously, avoiding motion errors caused by slippage. Multiple rollers are evenly distributed and share the axial load, significantly improving the overall load-bearing capacity.

[0021] 2. In this utility model, by setting threaded meshing surfaces and retaining rings, when the planetary roller screw pair roller gear structure is driven by a motor, the main screw drives multiple meshing rollers to rotate, and the multiple threaded meshing surfaces rotate synchronously with the retaining ring. The retaining ring fixes the multiple rollers in a preset circumferential position through physical constraints, ensuring that the rollers are always evenly distributed around the main screw during operation, thus optimizing load distribution and improving stability, thereby enhancing the reliability, accuracy and lifespan of the transmission system. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of a planetary roller screw pair roller gear structure proposed in this utility model;

[0023] Figure 2 This is a schematic diagram of the outer shell structure of a planetary roller screw pair roller gear structure proposed in this utility model;

[0024] Figure 3 This is a cross-sectional view of the roller gear structure of a planetary roller screw pair proposed in this utility model.

[0025] Figure 4 This is a schematic diagram of a synchronous gear structure for a planetary roller screw pair roller gear structure proposed in this utility model;

[0026] Figure 5 This is a cross-sectional view of the main screw structure of the planetary roller screw pair roller gear structure proposed in this utility model.

[0027] Figure 6 This is a schematic diagram of the roller structure of a planetary roller screw pair roller gear structure proposed in this utility model;

[0028] Figure 7 This is a schematic diagram of the main screw structure of a planetary roller screw pair with roller gear structure proposed in this utility model;

[0029] Legend:

[0030] 1. Housing; 2. Mounting slot; 3. Mounting thread; 4. Internal thread; 5. Synchronizing gear; 6. Retaining ring; 7. Mounting slot; 8. Mounting screw; 9. Rotary thread; 10. Fixing slot; 11. Roller; 12. Auxiliary rotating auger; 13. Threaded meshing surface; 14. Main screw; 15. Threaded raceway; 16. Retaining ring. Detailed Implementation

[0031] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see the appendix Figure 1 -Appendix Figure 7 This utility model provides a technical solution: a planetary roller screw pair roller gear structure, including a housing 1, an installation groove 2 is provided inside the housing 1, an installation thread 3 is provided inside the installation groove 2, an internal thread 4 is provided inside the housing 1, and a synchronous gear 5 is rotatably installed on both sides of the housing 1.

[0033] The specific implementation method is as follows: a retaining ring 6 is rotatably installed on one end of the synchronous gear 5, and multiple mounting grooves 7 are provided inside the retaining ring 6, with mounting screws 8 inside the mounting grooves 7.

[0034] By setting the retaining ring 6 and the mounting groove 7, which are installed at the top and tail of the main lead screw 14, the retaining ring 6 physically limits the roller 11 to prevent unexpected displacement in the axial direction when the planetary roller lead screw is in operation, and the synchronous gear 5 can be a rigid support structure to directly bear part of the axial impact force, reducing the risk of instantaneous overload of the thread meshing surface 13.

[0035] The specific implementation method is as follows: the inside of the synchronizing gear 5 is provided with a rotating thread 9, and the inside of the retaining ring 6 is provided with a fixing groove 10 corresponding to one side of the synchronizing gear 5.

[0036] By setting a synchronizing gear 5 and a rotating thread 9, when the power source drives the main screw 14 to rotate, the rotating thread 9 inside the synchronizing gear 5 engages with multiple auxiliary rotating strands 12, and the rotation speed of all rollers 11 is forced to be consistent by the synchronizing gear 5, so as to ensure that the thread engagement position of each roller 11 with the main screw 14 is always aligned, reducing backlash and improving transmission accuracy.

[0037] The specific implementation method is as follows: multiple mounting grooves 7 are provided with rollers 11 inside, and an auxiliary rotating wire 12 is provided on one side of the rollers 11, and the auxiliary rotating wire 12 meshes with the rotating thread 9.

[0038] By setting rollers 11 and auxiliary rotating screws 12, multiple rollers 11 are distributed in a planetary manner around the main screw 14. Through thread meshing, they simultaneously contact the main screw 14 and the internal thread 4 inside the housing 1, distributing the axial load to each roller 11 to improve load-bearing capacity and increase impact resistance.

[0039] The specific implementation method is as follows: a threaded engagement surface 13 is provided on one side of the auxiliary rotating wire 12 corresponding to the middle of the roller 11, and the main screw 14 is engaged with the inside of the outer shell 1 corresponding to the internal thread 4.

[0040] By setting the threaded meshing surface 13 and the main lead screw 14, the main lead screw 14 and the threaded meshing surface 13 on the surface of the roller 11 adopt surface contact meshing, the contact area is greatly increased, the contact stress is significantly reduced, and the precision thread meshing between the roller 11 and the main lead screw 14 is forced to align the phase through the synchronous gear 5, eliminating motion slippage and reducing backlash.

[0041] The specific implementation method is as follows: the surface of the main lead screw 14 is provided with a threaded raceway 15, and the threaded raceway 15 is meshed with the auxiliary rotating screw 12, and a retaining ring 16 is meshed with the surface of the threaded meshing surface 13.

[0042] By setting up the threaded raceway 15 and the retaining ring 16, when the power source drives the main screw 14 to rotate, the threaded raceway 15 drives multiple rollers 11 to rotate synchronously. Under high-speed or high-load conditions, the rollers 11 may collide with each other due to centrifugal force or vibration. The retaining ring 16 isolates the rollers 11, avoiding direct contact and reducing lateral friction of the rollers 11.

[0043] Working principle and usage: When this planetary roller screw pair roller gear structure is in operation, the main screw 14 is driven by a motor. The power source drives the main screw 14 to rotate inside the housing 1. The mounting slot 2 inside the housing 1 is connected to the main screw 14 through meshing. The rotation of the main screw 14 drives multiple planetary rollers 11 to rotate around their own axis through threaded meshing. While rotating, the rollers 11 are constrained by the housing 1 and revolve around the axis of the main screw 14 in a planetary manner. Multiple synchronous gears 5 are installed at the top and tail of the main screw 14 to force the rotation speed of the rollers 11 to be synchronized and avoid slippage error. The thread of each roller 11 meshes with the threads of the main screw 14 and the housing 1 simultaneously to form double-sided contact. The revolution of the rollers 11 transmits the thrust to the housing 1 through threaded meshing, pushing the housing 1 to move linearly along the axis of the main screw 14 for precise cooperation with multiple components.

[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A planetary roller screw pair roller gear structure, comprising a housing (1), characterized in that, The housing (1) has an installation slot (2) inside, the installation slot (2) has an installation thread (3) inside, the housing (1) has an internal thread (4) inside, and synchronous gears (5) are rotatably installed on both sides of the housing (1).

2. The planetary roller screw pair roller gear structure according to claim 1, characterized in that, A retaining ring (6) is rotatably mounted on one end of the synchronous gear (5). Multiple mounting grooves (7) are provided inside the retaining ring (6), and mounting screws (8) are provided inside the mounting grooves (7).

3. The planetary roller screw pair roller gear structure according to claim 2, characterized in that, The synchronous gear (5) has a rotating thread (9) inside, and the retaining ring (6) has a fixing groove (10) on one side corresponding to the synchronous gear (5).

4. The planetary roller screw pair roller gear structure according to claim 2, characterized in that, The mounting groove (7) has a roller (11) inside, and an auxiliary rotating wire (12) is provided on one side of the roller (11), and the auxiliary rotating wire (12) meshes with the rotating thread (9).

5. The planetary roller screw pair roller gear structure according to claim 4, characterized in that, The auxiliary rotating wire (12) has a threaded engagement surface (13) on one side corresponding to the middle of the roller (11), and the main screw (14) is engaged with the inside of the outer shell (1) corresponding to the internal thread (4).

6. The planetary roller screw pair roller gear structure according to claim 5, characterized in that, The main lead screw (14) has a threaded raceway (15) on its surface, and the threaded raceway (15) is meshed with the auxiliary rotating screw (12). The threaded meshing surface (13) is meshed with a retaining ring (16).

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