Assembly tool of planetary roller screw structure

Abstract

The utility model relates to a tool for assembly. An assembly tool of a planetary roller lead screw structure comprises a base, a central spindle is detachably connected to the center of the base, the outer circumferential surface of the central spindle is provided with arc groove faces, the number of the arc groove faces corresponds to that of rollers, a stud positioning boss is arranged in the center of the base, a nut mounting groove is further formed in the base, the nut mounting groove and the positioning boss are coaxial, and the nut mounting groove and the positioning boss are matched with each other. The nut mounting groove is located on the periphery of the positioning boss. The utility model provides an assembly tool of a planetary roller screw structure, which is simple in structure, capable of quickly and efficiently realizing assembly and good in universality. The technical problems that in the prior art, a planetary roller lead screw structure is complex in assembly, the positions of a lead screw and a roller need to be repeatedly adjusted, and time and labor are wasted in assembly are solved.

Description

Technical Field

[0001] The utility model relates to an assembly tool, in particular to an assembly tool for a planetary roller screw structure. Background Art

[0002] A standard planetary roller screw consists of a screw, several rollers, a nut, an internal gear ring, a cage, and a retaining spring. The helical teeth on the rollers mesh with the internal gear ring, which provides a clearance fit between the nut and the planetary rollers. The structural principles of a conventional planetary roller screw pair indicate that the planetary rollers are flanked by external gears, while the planetary nuts are fitted with internal gear rings at both ends. These mesh with the external gears on either side of the rollers, ensuring coordinated operation between the nut and rollers during movement and preventing the rollers from being deflected by forces.

[0003] However, due to the existence of the gear pair, the assembly of the planetary screw pair is difficult, which can easily lead to a phase difference between the gear phase and the thread phase of the planetary roller, and the phase difference of each roller in the same group of rollers may be inconsistent. This will require adjusting the axial and circumferential position of each roller separately during assembly to ensure that the planetary roller thread raceway cooperates with the planetary nut thread raceway while ensuring that the gear pair of the planetary roller and the inner ring gear meshes normally. Otherwise, the planetary rollers cannot be assembled correctly, resulting in motion jamming and affecting transmission. Summary of the Invention

[0004] The utility model provides an assembly tool for a planetary roller screw structure with a simple structure, which can be assembled quickly and efficiently and has good versatility; it solves the technical problems in the prior art that the planetary roller screw structure is complicated to assemble, the position of the screw and roller needs to be repeatedly adjusted, and the assembly is time-consuming and labor-intensive.

[0005] The above-mentioned technical problem of the present invention is solved by the following technical solution: an assembly tool for a planetary roller screw structure, comprising a base, a mandrel detachably connected to the center of the base, the outer circumferential surface of the mandrel having an arc groove corresponding to the number of rollers, a stud positioning boss provided at the center of the base, and a nut mounting groove provided on the base, the nut mounting groove being coaxial with the positioning boss and located outside the positioning boss. The positioning boss is used to position the ends of the rollers. The rollers are placed on the positioning boss with the mandrel as the center, and then the nuts are inserted, with the ends of the nuts positioned in the nut mounting grooves. The relative positions of the nuts and rollers are adjusted so that they mesh with each other, and then the upper ring gear, upper retainer, and upper retaining spring are installed. The mandrel and base are then detachable, and the base is removed, and the lower ring gear, lower retainer, and lower retaining spring are installed, and finally the mandrel is removed. The assembly is convenient and versatile, and the axial and circumferential positions of each roller can be easily adjusted due to the phase difference between the rollers, ensuring proper meshing of the planetary roller thread raceway and the gear pair.

[0006] Preferably, the groove radius R of the arc-shaped groove surface and the roller radius r should satisfy the following relationship: 0 < Rr < half of the thread height, so as to facilitate the installation of the roller.

[0007] Preferably, the base is cylindrical, and a fixing hole is provided on the outer circumferential surface of the base. When the nut is mounted on the base, the position of the nut is fixed by installing a bolt in the fixing hole.

[0008] Preferably, a bolt hole is provided at the center of the bottom surface of the base, and the base is connected to the core shaft by bolts, which makes disassembly easy and the structure simple.

[0009] Preferably, the end of the roller is machined with an auxiliary mounting structure, such as a hexagon socket, a slotted socket, or a cross slot, to facilitate adjustment of the threaded connection between the roller and the nut.

[0010] Therefore, the assembly tooling of a planetary roller screw structure of the present invention has the following advantages: the position of each roller is positioned by the core shaft, the position of the nut is determined by the nut groove on the bottom surface, the core shaft and the base can be disassembled, and the relative positions of the rollers and nuts can be conveniently installed and then removed, and then the screw can be installed. The entire tooling structure is simple, which is convenient for assembling the planetary roller screw structure and has good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional diagram of an assembly tool for a planetary roller screw structure.

[0012] Figure 2 yes Figure 1 sectional view of .

[0013] Figure 3 yes Figure 1 A three-dimensional view of the base.

[0014] Figure 4 It is a three-dimensional diagram of the roller.

[0015] Figure 5 This is a perspective view of the roller and nut installed.

[0016] Figure 6 This is a three-dimensional image of the assembled planetary roller screw. DETAILED DESCRIPTION

[0017] The technical solution of the utility model is further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0018] Example:

[0019] like Figure 1 and 2As shown in Figure 3, an assembly tool for a planetary roller screw structure includes a cylindrical base 1, and a circular positioning boss 4 is provided in the center of the base 1. A bolt fixing hole 6 is provided in the center of the bottom surface of the base 1, and the bolt fixing hole 6 passes through the positioning boss 4. A cylindrical core shaft 2 is fixed in the center of the positioning boss 4 by bolts, and the length of the core shaft 2 is slightly smaller than the length of the roller 14 to be installed. Circular arc groove surfaces 3 are evenly distributed on the outer circumferential surface of the core shaft 2, and the number of circular arc groove surfaces 3 is the same as the number of rollers 14. The groove radius R of the circular arc groove surface 3 and the roller radius r must satisfy the following relationship, 0<Rr<half of the thread height. A nut mounting groove 5 is provided on the base 1, and the nut mounting groove 5 is coaxial with the positioning boss 4, and the nut mounting groove 5 surrounds the periphery of the positioning boss 4. Three evenly distributed fixing holes are provided on the outer circumferential surface of the base 1. After the nut 13 is installed in the nut mounting groove 5, the nut 13 is fixed by installing a tightening bolt 12 in the fixing hole. As shown Figure 4 As shown, the middle section of the roller to be installed is a threaded section 9, the two ends are gear sections 10, and the end face of the roller is processed with a hexagonal structure 11 to facilitate the adjustment of the roller with auxiliary tools.

[0020] like Figure 5 and 6 As shown, the assembly method of the tooling is as follows:

[0021] 1. Fix the base 1 and the core shaft 2 with bolts 7;

[0022] 2. Place the nut 13 into the assembly tool and secure it with the set bolt 12 through the fixing hole on the side of the base.

[0023] 3. Use an assembly auxiliary tool (such as an electric screwdriver) to screw the roller 13 along the arc-shaped groove of the core shaft 2 to the positioning boss 4 of the base through engagement with the thread of the nut 13;

[0024] 4. After all rollers 13 are installed, install the upper gear ring 16. If there is any misalignment between the rollers and the gears at the roller ends, use an assembly auxiliary tool (such as an electric screwdriver) to fine-tune the axial position of the rollers until all rollers are accurately engaged with the gear rings. Then, use the set screws 15 through the threaded holes on the nuts 13 to secure the upper gear ring 16.

[0025] 5. Install the upper retainer 17 and the upper retaining ring;

[0026] 6. Turn the entire assembly and planetary roller screw upside down;

[0027] 7. Remove the fastening bolts 12 that fix the nuts on the side of the base and the bolts 7 that connect the base and the core shaft, and remove the base 1;

[0028] 8. Assemble the lower gear ring 18 and secure it with the set bolts 15 through the threaded holes on the nuts;

[0029] 9. Install the lower retainer 19 and the lower retaining spring;

[0030] 10. Remove the core shaft 2 and install the lead screw 20. The assembly work is completed.

[0031] The specific embodiments described herein are merely illustrative of the concepts of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. An assembly tool for a planetary roller screw structure, characterized in that: It includes a base, a core shaft is detachably connected to the center of the base, the outer circumferential surface of the core shaft is an arc groove surface corresponding to the number of rollers, a stud positioning boss is provided in the center of the base, and a nut mounting groove is also provided on the base. The nut mounting groove is coaxial with the positioning boss, and the nut mounting groove is located outside the positioning boss.

2. The assembly tool for a planetary roller screw structure according to claim 1, characterized in that: The groove radius R of the arc groove surface and the roller radius r must satisfy the following relationship: 0<Rr<half of the thread height.

3. The assembly tool for a planetary roller screw structure according to claim 1 or 2, characterized in that: The base is cylindrical, and a fixing hole is provided on the outer circumferential surface of the base.

4. The assembly tool for a planetary roller screw structure according to claim 1 or 2, characterized in that: A bolt hole is provided at the center of the bottom surface of the base, and the base is connected to the core shaft through bolts.

5. The assembly tool for a planetary roller screw structure according to claim 1 or 2, characterized in that: The ends of the rollers are machined with auxiliary mounting structures.

Images