Inner gear ring fixing structure for planetary roller screw
By setting up a boss and groove structure between the nut and the inner ring of the planetary roller screw and fixing it through welding, the problems of high assembly costs and poor operation are solved, and efficient production and low-cost internal ring fixation are achieved.
Patent Information
- Application Number
- CN202422739116.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-11-11
AI Technical Summary
The assembly cost of the internal ring fixing structure of the existing planetary roller screw is high, and it is easy to cause the mechanism to run unsmoothly, especially after the heat treatment of high-hard parts, the drill bit life is shortened and the internal ring gear deformation is large.
A boss and groove structure is arranged between the nut and the inner ring gear, and fixed by welding, to minimize the impact on the meshing area by using the heat generated by the weld at the end surface to achieve the fixation of the nut and the inner ring gear.
The parts processing steps are simplified, production costs are reduced, production efficiency is improved, and deformation risks in the meshing area are reduced, ensuring smooth operation of the mechanism.
Smart Images
Figure CN223089925U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a transmission structure, in particular to an internal gear ring fixing structure for a planetary roller screw. Background Art
[0002] A standard planetary roller screw comprises a screw rod, a plurality of rollers, a nut, an internal gear ring, a cage and a snap ring. The spiral teeth at the end of the roller are meshed with the internal gear ring, and the internal gear ring and the nut are in clearance fit. The internal gear ring cannot rotate during operation, so it needs to be fixed to the nut with a stop pin. There are currently two commonly used assembly methods: 1. When machining the gear ring and the nut, stop pin holes are drilled and position marks are made, and they are assembled one by one during assembly. This method greatly increases the control cost and processing time; 2. After the gear ring and the nut are assembled, stop pin holes are drilled. The disadvantage of this method is that the parts have a very high hardness after heat treatment, which will greatly shorten the life of the drill bit. Moreover, since the stop pin needs to be interference-connected with the parts to take effect, if the connection position is designed unreasonably, a large deformation of the gear part of the internal gear ring will also cause the mechanism to operate smoothly. Summary of the Invention
[0003] The utility model provides an internal gear ring fixing structure for a planetary roller screw, which has a simple structure, an efficient connection method, convenient installation and positioning, and can effectively prevent the two from rotating; and solves the technical problems existing in the prior art that the gear ring fixing structure of the planetary roller screw transmission structure has a high assembly cost and is likely to cause the mechanism to operate smoothly.
[0004] The above technical problems of the present utility model are solved by the following technical solutions: An internal gear ring fixing structure for a planetary roller screw comprises a nut, with internal gear rings provided at both ends of the nut. A positioning mechanism is provided between the nut and the internal gear rings. The positioning structure includes a mating boss and groove structure, with the boss and groove respectively provided on the outer surface of the internal gear ring and the inner surface of the nut. A weld seam is provided where the nut and the internal gear ring are fitted together, and the surfaces of the nut and the internal gear ring are fixed by welding. Through a roller assembly tool, the rollers are assembled into the nut and cooperate with the screw and the gear ring. After the rollers are assembled, the circumferential positions of the gear ring and the nut are fixed by the positioning structure of the boss and the groove, and then the gear ring and the nut are welded. Since the welding surface is at the end face, the heat generated by the welding has a negligible impact on the gear meshing area and the thread meshing area. This method can not only reduce the part processing steps, improve the part production efficiency, and reduce the production cost, but also reduce the deformation risk of the thread meshing area and the gear meshing area caused by the anti-rotation structure of the internal gear ring. Then when the screw rotates, the rollers are driven by the screw to rotate, and a force that causes relative movement between the internal gear ring and the nut will be generated in the meshing area between the internal gear ring and the rollers. At this time, since the internal gear ring and the nut are welded into one body, relative movement between the internal gear ring and the nut can be prevented, and when the weld seam fails, the boss on the internal gear ring and the groove on the nut can also prevent relative movement between the internal gear ring and the nut.
[0005] Preferably, a weld seam interface is provided at the starting end of the weld seam. The weld seam interface is in a "V" shape. This facilitates welding and has a good welding effect.
[0006] Preferably, the V-shaped angle of the "V"-shaped weld seam interface is 45° - 60°.
[0007] Preferably, the end of the inner circumferential surface of the nut is machined with an inclined welding surface, and the end of the outer circumferential surface of the internal gear ring is machined with an inclined welding surface.
[0008] Preferably, there are two groups of the positioning structures of the boss and the groove, and the two groups of positioning structures are located at both ends of the same diameter. Considering from the perspective of part lightweight, the number of the boss and the groove is preferably 2, while ensuring good positioning effect and strong stability.
[0009] Preferably, the boss is located on the outer surface of the internal gear ring, and the length of the boss is the same as the length of the gear ring.
[0010] Therefore, a fixed structure for the internal gear ring of a planetary roller screw of the present utility model has the following advantages: By respectively machining a corresponding number of grooves and bosses on the nut and the internal gear ring for positioning, and then using a single V-shaped groove machined on the joint surface of the internal gear ring and the nut, the nut and the internal gear ring are welded together by welding. This connection method is simple and efficient, and the weld is at the end face, so the heat generated by welding can be basically ignored at the thread engagement, and there is no risk of deformation in the engagement area. This method can not only reduce the machining steps of parts, improve the production efficiency of parts, and reduce production costs. The cooperation of the groove and the boss can not only achieve positioning, but also when the weld fails, the boss on the internal gear ring and the groove on the nut can also prevent the relative movement of the internal gear ring and the nut. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 is an exploded view of a fixed structure for the internal gear ring of a planetary roller screw.
[0012] Figure 2 is Figure 1 a cross-sectional view of
[0013] Figure 3 is Figure 2 an enlarged view of part A of DETAILED DESCRIPTION OF THE EMBODIMENTS
[0014] The technical solution of the utility model will be further specifically described below through embodiments in conjunction with the drawings.
[0015] Embodiment:
[0016] As Figure 1 and 2 and Figure 3 show, a fixed structure for the internal gear ring of a planetary roller screw includes a screw 6 at the center. The outer circumferential surface of the screw 6 is evenly distributed with studs 5. Retainers 7 are installed at both ends of the studs 5. A nut 1 is sleeved outside the studs 5. An internal gear ring 2 is installed at each end of the nut 1. The internal teeth of the inner ring of the internal gear ring 2 are engaged with the studs 5 for transmission. Two bosses 4 are integrally formed on the outer circumferential surface of the internal gear ring 2. The two bosses 4 are located at both ends of the same diameter of the internal gear ring 2, and the length of the boss 4 is the same as the length of the internal gear ring 2. A groove 3 that cooperates with the boss 4 is machined on the inner circumferential surface of the nut 1. An inclined surface is machined on the end face of the internal gear ring 2, and an inclined surface is also machined on the end face of the nut. When the internal gear ring and the nut are positioned and cooperated through the boss and the groove, the two inclined surfaces form a "V"-shaped welding joint 8, and the V-shaped angle of the "V"-shaped welding joint 8 is 50°.
[0017] The specific embodiments described herein are merely illustrative of the concept of the present utility model. Those skilled in the art to which the present utility model pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.
Claims
1. An internal gear ring fixing structure for a planetary roller screw, comprising a nut, and internal gear rings are provided at both ends of the nut, characterized in that: A positioning mechanism is provided between the nut and the internal gear ring. The positioning mechanism includes a boss and a groove structure that cooperate with each other. The boss and the groove are respectively arranged on the outer surface of the internal gear ring and the inner surface of the nut. A weld seam is provided where the nut and the internal gear ring are fitted, and the surfaces of the nut and the internal gear ring are fixed by welding.
2. The fixed structure of the internal gear ring for a planetary roller screw according to claim 1, characterized in that: A weld seam interface is provided at the starting end of the weld seam, and the weld seam interface is in a "V" shape.
3. The internal gear ring fixing structure for a planetary roller screw according to claim 2, characterized in that: The V-shaped angle of the "V"-shaped weld seam interface is 45° to 60°.
4. The internal gear ring fixing structure for a planetary roller screw according to claim 2, characterized in that: An inclined welding surface is machined at the end of the inner circumferential surface of the nut, and an inclined welding surface is machined at the end of the outer circumferential surface of the internal gear ring.
5. A fixing structure for an internal gear ring of a planetary roller screw according to any one of claims 1 to 4, characterized in that: There are two sets of positioning structures for the boss and the groove, and the two sets of positioning structures are located at both ends of the same diameter.
6. The fixed structure of the internal gear ring for a planetary roller screw according to any one of claims 1 to 4, characterized in that: The boss is located on the outer surface of the internal gear ring, and the length of the boss is the same as the length of the gear ring.