Standard planetary roller screw rod structure convenient to assemble

Abstract

The invention relates to the field of mechanical transmission, and particularly discloses a standard planetary roller screw rod structure convenient to assemble, which comprises transmission rollers, fixing nuts, an assembly frame, a fixing ring and a limiting snap ring, the shape of the assembly frame is similar to a hollow cylinder, and a plurality of transmission rollers are uniformly distributed in the assembly frame for limiting rotation; the two ends of the inner wall of the fixing nut are provided with a fixing groove and a limiting groove respectively, the limiting groove communicates with the fixing groove, the diameter of a ring formed by the fixing groove is smaller than that of a ring formed by the limiting groove, the fixing ring is limited between the fixing groove and the assembly frame, the limiting clamping ring is embedded in the limiting groove, and the inner side of the limiting clamping ring abuts against the fixing ring. By arranging the integrated assembly frame, the situation that an inner gear ring is separately arranged at the two ends of the transmission pin roller in the past is not needed, assembly falling apart between the assembly frame and the transmission pin roller during assembly is avoided, the assembly speed can be increased through cooperation of the fixing grooves and the limiting grooves with the fixing rings and the limiting clamping rings correspondingly, and the whole assembly process is simple and convenient.

Description

Technical Field

[0001] The present invention relates to the field of mechanical transmission, and particularly to a standard planetary roller screw structure. Background Art

[0002] A planetary roller screw is a transmission component that converts rotational motion into linear motion, having advantages such as high operating speed, strong load-bearing capacity, good environmental adaptability, and long service life, with broad application prospects. In existing standard planetary roller screw drive mechanisms, the screw rod and nut are multi-start threads, and the tooth profiles are all triangular. The rollers are single-start threads, and the tooth profile is a spherical contour. In order to generate an axial relative displacement between the rollers and the screw rod, the inner wall of the nut meshes with the roller surface. In order to eliminate the tilting moment generated by the screw rod helix angle on the rollers, straight teeth are machined at both ends of the rollers, which mesh with the internal gear rings provided at both ends of the nut to ensure that the roller axis is parallel to the screw rod axis for normal rolling. However, since the rollers will generate minute offsets when driven by the screw rod, the internal gear rings provided at both ends of the rollers are separately arranged. As a result, when the rollers rotate, due to the offset of the rollers, slight jamming will occur between the rollers and the internal gear rings.

[0003] In addition, since the internal gear rings and the nut have different tooth grooves, they need to be assembled separately during the assembly process. Moreover, the tooth grooves of the internal gear rings are small, and it is necessary to observe and align during the assembly of the internal gear rings, which tests the assembly experience of the assembly personnel.

[0004] The technical problem to be solved by the present application is: how to reduce the assembly difficulty of a standard planetary roller screw. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a standard planetary roller screw structure that is convenient for assembly.

[0006] The technical solution adopted by the present invention is: a standard planetary roller screw structure that is convenient for assembly, including drive rollers, a fixed nut, an assembly frame, a fixing ring, and a limit retaining ring. The assembly frame is shaped like a hollow cylinder, and several drive rollers are evenly distributed in the assembly frame for limited rotation. At both ends of the inner wall of the fixed nut, there are respectively a fixing groove and a limit groove. Both the fixing groove and the limit groove are annular grooves, and the limit groove communicates with the fixing groove. The annular diameter formed by the fixing groove is smaller than the annular diameter formed by the limit groove. The fixing ring is restricted between the fixing groove and the assembly frame, and the limit retaining ring is embedded in the limit groove, and the inner side of the limit retaining ring abuts against the fixing ring.

[0007] In some embodiments, it includes a moving screw rod, and the moving screw rod is in threaded cooperation with the drive rollers.

[0008] In some embodiments, the middle part of the transmission roller is provided with a single-start thread, the two ends of the transmission roller are provided with smooth outer circumferential surfaces, and the diameter of the middle part of the transmission roller is larger than the diameter of the ends of the transmission roller.

[0009] In some embodiments, the assembly frame is provided with assembly ends and connecting shafts. A plurality of connecting shafts are evenly arranged between the two assembly ends. The two ends of each connecting shaft are fixedly connected to the corresponding assembly ends respectively. A movement area for supplying rotation of the transmission roller is provided between two connecting shafts, and the movement area communicates with the central area of the assembly frame.

[0010] In some embodiments, the outer edge of the assembly end is provided with rotation grooves having the same number as the transmission rollers. The rotation grooves communicate with the movement area. The number and positions of the rotation grooves of one assembly end are arranged opposite to those of the other assembly end.

[0011] In some embodiments, the bottom of the rotation groove is provided with an arc shape matching the shape of the end of the transmission roller, and the groove height of the rotation groove is higher than the diameter of the end of the transmission roller.

[0012] In some embodiments, the fixing ring is provided with an enclosing part and a limiting part. The included angle between the enclosing part and the limiting part is 90°. The enclosing part is arranged in a ring shape and covers the notch of the rotation groove on the same assembly end. The limiting part abuts against the assembly end.

[0013] In some embodiments, the assembly end and the connecting shaft are integrally formed or welded.

[0014] In some embodiments, each movement area allows the same number of transmission rollers to perform internal transmission.

[0015] The beneficial effects of the present invention are as follows:

[0016] The standard planetary roller screw structure convenient for assembly is provided with an integrated assembly frame. The transmission roller cooperates with the assembly frame, eliminating the need to separately arrange the internal gear rings at both ends of the transmission roller in the past, avoiding the disassembly of the assembly between the assembly frame and the transmission roller during assembly. Moreover, through the cooperation of the fixing groove and the limiting groove with the fixing ring and the limiting snap ring respectively, the assembly speed of the fixing ring and the limiting snap ring in the fixing nut can be improved. The fixing ring and the limiting snap ring can limit the axial movement of the assembly frame in the fixing nut. The entire assembly process is simple and convenient, and the main body assembly can be easily completed without experience or observation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall structural schematic diagram of the present invention;

[0018] Figure 2 is the exploded schematic diagram of the overall structure of the present invention;

[0019] Figure 3Schematic structural cross-section diagram of the present invention;

[0020] Figure 4 Schematic structural diagram of the assembly rack;

[0021] Figure 5 Schematic structural diagram of the fixing ring;

[0022] The reference numerals in the figure correspond to the names as follows: 1, moving lead screw; 2, transmission roller; 3, fixed nut; 4, assembly rack; 5, fixing ring; 6, limit retaining ring; 31, fixing groove; 32, limit groove; 41, assembly end; 42, connecting shaft; 43, moving area; 411, rotating groove; 51, enclosing part; 52, limiting part. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0024] Please refer to Figure 1 , the present invention provides a technical solution: a standard planetary roller screw structure convenient for assembly, including a moving lead screw 1, a transmission roller 2, a fixed nut 3, an assembly rack 4 and a fixing ring 5. The transmission roller 2 is arranged on the assembly rack 4, the moving lead screw 1 is in threaded cooperation with the transmission roller 2, the fixed nut 3 is in threaded cooperation with the transmission roller 2, and the assembly rack 4 and the transmission roller 2 are assembled in the fixed nut 3. The outer wall of the moving lead screw 1 is provided with multi-start threads, and the thread profile is triangular. The middle part of the transmission roller 2 is provided with single-start threads, and the thread profile is a spherical contour. The two ends of the transmission roller 2 are provided with smooth outer circumferences, and the middle diameter of the transmission roller 2 is greater than the end diameter of the transmission roller 2. When the moving lead screw 1 rotates, the transmission roller 2 drives the fixed nut 3 and the assembly rack 4 to axially displace along the moving lead screw 1.

[0025] Please refer to Figures 1-4 , the shape of the assembly rack 4 is similar to a hollow cylinder, the moving lead screw 1 can pass through the center of the assembly rack 4, the assembly rack 4 is provided with an assembly end 41 and a connecting shaft 42, and a plurality of connecting shafts 42 are evenly arranged between the two assembly ends 41. The two ends of the connecting shaft 42 are respectively fixedly connected to the corresponding assembly ends 41. This fixed connection can be integrally formed or welded to ensure that each point of the assembly rack 4 is evenly stressed during rotation and the connection between the assembly ends 41 is stable.

[0026] There is a motion area 43 for supplying the rotation of the transmission roller 2 between the two connecting shafts 42. The motion area 43 is set corresponding to the number of the transmission rollers 2. In this embodiment, only one transmission roller 2 is allowed to rotate inside one motion area 43. However, actually, each motion area 43 allows the same number of transmission rollers 2 to transmit inside. Moreover, the motion area 43 communicates with the central area of the assembly frame 4 to ensure the meshing transmission between the motion lead screw 1 and the transmission roller 2.

[0027] The outer edge of the assembly end 41 is provided with rotation grooves 411 having the same number as that of the transmission rollers 2. The rotation grooves 411 communicate with the motion area 43. The bottom of the rotation groove 411 is provided with an arc shape matching the shape of the end of the transmission roller 2. The groove height of the rotation groove 411 is higher than the diameter of the end of the transmission roller 2. The rotation grooves 411 of one assembly end 41 and the rotation grooves 411 of the other assembly end 41 are arranged opposite in number and position. Even if there is a slight position deviation during the rotation of the transmission roller 2 due to the transmission relationship of the transmission lead screw, it does not prevent the overall assembly frame 4 from being driven by the transmission roller 2 to rotate, thereby reducing the jamming situation that occurs during the transmission of the transmission roller 2.

[0028] In addition, when the transmission roller 2 is assembled on the assembly frame 4, the transmission roller 2 can be completed by entering from the notch of the rotation groove 411. If the assembly frame 4 and the transmission roller 2 have been assembled, only need to place the assembled assembly frame 4 and the transmission roller 2 into the fixing nut 3 to complete the assembly with the fixing nut 3. The whole assembly process is simple and convenient, and easy to operate.

[0029] Please refer to Figure 5 , the fixing ring 5 is sleeved on the assembly end 41. The fixing ring 5 is provided with an enclosing part 51 and a limiting part 52. The included angle between the enclosing part 51 and the limiting part 52 is 90°. The enclosing part 51 is arranged in a ring shape and covers the notch of the rotation groove 411 on the same assembly end 41. The limiting part 52 abuts against the assembly end 41, thereby restricting the assembly frame 4 between the two fixing rings 5.

[0030] Please refer to Figure 3, both ends of the inner wall of the fixing nut 3 are respectively provided with a fixing groove 31 and a limiting groove 32. The fixing groove 31 and the limiting groove 32 are both annular grooves, and the limiting groove 32 communicates with the fixing groove 31. The limiting groove 32 is arranged closer to the external space than the fixing groove 31. The annular diameter formed by the fixing groove 31 is smaller than the annular diameter formed by the limiting groove 32. The fixing ring 5 is arranged in the fixing groove 31, and the fixing ring 5 is restricted between the fixing groove 31 and the assembly end 41, thereby restricting the radial movement of the fixing ring 5. The limiting groove 32 is provided with a limiting snap ring 6. Both sides of the limiting snap ring 6 are in contact with the corresponding groove walls of the limiting groove 32. The limiting snap ring 6 is embedded in the limiting groove 32, thereby restricting the radial and axial movement of the limiting snap ring 6. The inner side of the limiting snap ring 6 is in contact with the fixing ring 5, restricting the axial movement of the fixing ring 5, and finally restricting the axial movement of the assembly frame 4.

[0031] Since the limiting groove 32 communicates with the fixing groove 31, the fixing ring 5 can be directly sleeved on both ends of the assembly frame 4 that has been connected to the fixing nut 3. Moreover, since the limiting part 52 is in contact with the assembly end 41, it can be known whether the assembly is in place without experience. Since the limiting buckle is an open annular structure and has a certain elasticity, after the fixing ring 5 is installed, the limiting snap ring 6 is placed into the limiting groove 32 to complete the assembly of the main body. The entire assembly process is simple and convenient, and the main body assembly can be easily completed without experience and without observation.

[0032] Finally, it should be noted that the above are only preferred examples of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A standard planetary roller screw structure for convenient assembly, characterized in that, It includes a transmission roller (2), a fixing nut (3), an assembly frame (4), a fixing ring (5) and a limit snap ring (6). The assembly frame (4) is shaped like a hollow cylinder. A number of the transmission rollers (2) are evenly distributed in the assembly frame (4) for limited rotation. At both ends of the inner wall of the fixing nut (3), a fixing groove (31) and a limit groove (32) are respectively provided. Both the fixing groove (31) and the limit groove (32) are annular grooves. The limit groove (32) communicates with the fixing groove (31). The annular diameter formed by the fixing groove (31) is smaller than the annular diameter formed by the limit groove (32). The fixing ring (5) is restricted between the fixing groove (31) and the assembly frame (4). The limit snap ring (6) is embedded in the limit groove (32), and the inner side of the limit snap ring (6) abuts against the fixing ring (5).

2. The structure of a standard planetary roller screw convenient for assembly according to claim 1, characterized in that, It includes a moving lead screw (1), and the moving lead screw (1) is in threaded fit with the transmission roller (2).

3. A standard planetary roller screw structure that is convenient for assembly according to claim 1, characterized in that, The middle part of the transmission roller (2) is provided with a single-start thread. The two ends of the transmission roller (2) are provided with smooth outer circumferences. The diameter of the middle part of the transmission roller (2) is larger than the diameter of the ends of the transmission roller (2).

4. A conveniently assembled standard planetary roller screw structure according to claim 3, characterized in that, The assembly frame (4) is provided with assembly ends (41) and connecting shafts (42). A number of the connecting shafts (42) are evenly arranged between the two assembly ends (41). Both ends of the connecting shaft (42) are fixedly connected to the corresponding assembly ends (41). A movement area (43) for supplying rotation to the transmission roller (2) is provided between the two connecting shafts (42). The movement area (43) communicates with the central area of the assembly frame (4).

5. A standard planetary roller screw structure convenient for assembly according to claim 4, characterized in that, The outer edge of the assembly end (41) is provided with rotation grooves (411) having the same number as the transmission rollers (2). The rotation grooves (411) communicate with the movement area (43). The rotation grooves (411) of one assembly end (41) are arranged in terms of quantity and position opposite to the rotation grooves (411) of the other assembly end (41).

6. A standard planetary roller screw structure for convenient assembly according to claim 5, characterized in that, The bottom of the rotation groove (411) is provided with an arc shape matching the shape of the end of the transmission roller (2). The groove height of the rotation groove (411) is higher than the diameter of the end of the transmission roller (2).

7. A standard planetary roller screw structure convenient for assembly according to claim 5, characterized in that, The fixing ring (5) is provided with an enclosing part (51) and a limiting part (52). The included angle between the enclosing part (51) and the limiting part (52) is 90°. The enclosing part (51) is annularly arranged and covers the notch of the rotation groove (411) on the same assembly end (41). The limiting part (52) abuts against the assembly end (41).

8. A standard planetary roller screw structure convenient for assembly according to claim 1, characterized in that, The assembly end (41) and the connecting shaft (42) are integrally formed or welded.

9. A standard planetary roller screw structure convenient for assembly according to claim 4, characterized in that, Each of the movement areas (43) allows the same number of transmission rollers (2) to transmit motion inside.

Images