Planetary roller screw transmission mechanism with simple structure

Abstract

The utility model discloses a planetary roller lead screw transmission mechanism with a simple structure, which comprises a middle lead screw (1), a nut seat (2) and a plurality of annularly distributed roller bodies (3) arranged between the middle lead screw (1) and the nut seat (2), and two symmetrically distributed inner gear rings (4) are arranged between the nut seat (2) and the roller bodies (3). A plurality of inner tooth keys (5) which are annularly and uniformly distributed are arranged on the inner side wall of each inner gear ring (4), outer gear rings (6) are arranged at the two ends of the roller body (3), and a plurality of outer tooth keys (7) which are annularly and uniformly distributed are arranged on the surface of each outer gear ring (6); the outer tooth key (7) and the inner tooth key (5) are connected in a meshed mode, and the outer tooth key (7) and the inner tooth key (5) are both of a herringbone structure. According to the utility model, the transmission speed can be improved, and the transmission device has the advantages of simple structure, high structural stability, good lubricating effect, long service life and convenience in use.

Description

Technical Field

[0001] The utility model relates to a transmission structure of a planetary ball screw, in particular to a planetary roller screw transmission mechanism with a simple structure. Background Art

[0002] A planetary roller screw is a mechanical transmission device that can convert rotational motion and linear motion into each other. It mainly includes components such as a screw, a nut seat, a roller body, a planetary carrier and an inner gear ring. It has the advantages of high rigidity, long life and high dynamic performance.

[0003] In the specific transmission process, the planetary roller screw mainly transmits motion through multiple roller bodies. In order to ensure that the multiple roller bodies can be stably installed between the nut seat and the screw, it is necessary to set a guide on the nut seat and rotatably install the roller body on the guide to ensure the stability of the roller body installation. The added guide, plus the inner gear ring and planet carrier that are arranged on the nut seat and meshed with the roller body, make the structure of the entire planetary roller screw more complicated. In addition, generally two inner gear rings are provided, which destroys the continuity of the spiral raceway on the inner wall of the nut seat that matches the roller body, thereby affecting the transmission efficiency of the planetary roller screw. Therefore, the existing planetary roller screw has the problems of low transmission efficiency and complex overall structure during use. Utility Model Content

[0004] The purpose of the utility model is to provide a planetary roller screw transmission mechanism with a simple structure. The utility model can not only improve the transmission rate, but also has the advantage of a simple structure.

[0005] The technical solution of the utility model is as follows: a planetary roller screw transmission mechanism with a simple structure comprises an intermediate screw rod, a nut seat and a plurality of roller bodies arranged in an annular shape between the intermediate screw rod and the nut seat; two symmetrically distributed inner gear rings are arranged between the nut seat and the roller body; the inner side wall of each inner gear ring is provided with a plurality of inner gear keys evenly distributed in an annular shape; outer gear rings are arranged at both ends of the roller body; a plurality of outer gear keys evenly distributed in an annular shape are arranged on the surface of each outer gear ring; the outer gear keys and the inner gear keys are meshingly connected, and both the outer gear keys and the inner gear keys are of a herringbone structure; both the inner gear keys and the outer gear keys are of a herringbone structure, that is, the inner gear keys and the outer gear keys are provided with The two sets of oblique helical gears enable one set of oblique tooth keys to offset the thrust of the other set of oblique tooth keys during the transmission process, thereby ensuring high-speed and smooth transmission between the roller body and the nut seat, and ensuring the transmission rate; at the same time, because the herringbone internal tooth keys and external tooth keys have two oblique directions, when not working, a certain position limitation is formed between the oblique tooth keys, avoiding the roller body from falling out from between the nut seat and the intermediate screw rod, ensuring the structural stability while also making the entire planetary roller screw do not need to additionally set up a guide ring for fixing the roller body, thereby making the structure of the entire planetary roller screw simpler.

[0006] In the aforementioned planetary roller screw transmission mechanism with a simple structure, a limiting ring groove is provided on the inner side wall of the nut seat at the position corresponding to each inner gear ring; the limiting ring groove is used to limit the position of the inner gear ring, thereby further ensuring the stability of the structure.

[0007] In the aforementioned simple-structured planetary roller screw transmission mechanism, an oil storage chamber is provided in the outer gear ring, and each of the outer gear keys is provided with a lubrication channel connected to the oil storage chamber, and each lubrication channel is connected to an oil outlet hole located on the side of the outer gear key; a lubrication channel and an oil outlet hole connected to the oil storage chamber are provided on the outer gear key, so that during the meshing transmission of the internal gear key and the external gear key, the lubricating oil in the oil storage chamber will flow through the oil outlet hole to between the surfaces of the internal gear key and the external gear key, thereby lubricating the internal gear key and the external gear key, thereby improving the wear resistance of the internal gear key and the external gear key and extending the service life.

[0008] In the aforementioned simple-structured planetary roller screw transmission mechanism, an oil filling hole is provided on the oil storage chamber, and the oil filling hole is arranged on the outer side surface of the outer gear ring; a sealing cover is threadedly installed on the oil filling hole; by threading the sealing cover on the oil filling hole, it is convenient to add lubricating oil to the oil storage chamber, and it can also ensure that the lubricating oil will not flow out of the oil filling hole during use, which facilitates use and avoids unnecessary waste of lubricating oil.

[0009] In the aforementioned planetary roller screw transmission mechanism with a simple structure, the oil outlet hole is arranged in the middle of the side surface of the external tooth key; the oil outlet hole is arranged in the middle of the side surface of the internal tooth key. Because the internal tooth key is generally in a herringbone shape, when the lubricating oil flows out of the oil outlet hole, the lubricating oil will be evenly coated on the surfaces of the internal tooth key and the external tooth key along the inclined surfaces on both sides, thereby ensuring the lubrication effect.

[0010] In the aforementioned planetary roller screw transmission mechanism with a simple structure, an internal thread section is provided on the inner side wall of the nut seat at a position corresponding to the middle of the two inner gear rings; an external thread section matching the internal thread section is provided on the roller body at a position corresponding to the position between the two outer gear rings; and a thread section matching the external thread section is provided on the surface of the intermediate screw rod.

[0011] Compared with the prior art, the utility model improves the existing planetary roller screw transmission mechanism, by providing an internal tooth key with a herringbone structure on the inner gear ring of the nut seat, and providing an external tooth key with a herringbone structure on the outer gear ring of the roller body, and utilizing the meshing connection between the internal tooth key and the external tooth key to perform transmission between the nut seat and the roller body, because both the internal tooth key and the external tooth key are in a herringbone structure, that is, two sets of oblique helical gears are provided on the internal tooth key and the external tooth key, so that during the transmission process, one set of oblique tooth keys can offset the other set of oblique tooth keys Thrust, thereby ensuring high-speed and smooth transmission between the roller body and the nut seat, ensuring the transmission rate; at the same time, because the herringbone internal tooth key and external tooth key have two oblique directions, when the seat is not engaged, a certain position limit will be formed between the oblique tooth keys, avoiding the roller body from falling out from between the nut seat and the intermediate screw rod, ensuring the structural stability while also making the entire planetary roller screw do not need to additionally set up a guide ring for fixing the roller body, thereby making the structure of the entire planetary roller screw simpler. In addition, the utility model further ensures the stability of the structure by providing a limiting ring groove on the nut seat to limit the position of the inner gear ring; by providing an oil storage chamber on the outer gear ring, and providing a lubrication channel and an oil outlet hole connected to the oil storage chamber on the outer gear key, so that in the process of meshing transmission between the inner gear key and the outer gear key, the lubricating oil in the oil storage chamber will flow through the oil outlet hole to between the surfaces of the inner gear key and the outer gear key, thereby lubricating the inner gear key and the outer gear key, improving the wear resistance of the inner gear key and the outer gear key, and extending the service life; by threading a sealing cover on the oil filling hole, it is convenient to add lubricating oil to the oil storage chamber, and it can also ensure that the lubricating oil will not flow out of the oil filling hole during use, which is convenient for use and avoids unnecessary waste of lubricating oil; by setting the oil outlet hole in the middle of the side of the inner gear key, because the inner gear key is in a herringbone shape as a whole, when the lubricating oil flows out of the oil outlet hole, the lubricating oil will be evenly coated on the surfaces of the inner gear key and the outer gear key along the inclined surfaces on both sides, thereby ensuring the lubrication effect. Therefore, the utility model can not only improve the transmission speed, but also has the advantages of simple structure, high structural stability, good lubrication effect, long service life and easy use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 It is a schematic diagram of the structure of the outer gear ring;

[0014] Figure 3 It is a top view of the outer gear ring;

[0015] Figure 4 It is a structural diagram of the inner ring gear.

[0016] The markings in the attached drawings are: 1-intermediate screw, 2-nut seat, 3-roller body, 4-inner gear ring, 5-inner gear key, 6-outer gear ring, 7-outer gear key, 8-limiting ring groove, 9-oil storage chamber, 11-oil outlet hole, 12-oil filling hole, 13-sealing cover. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0018] Embodiment. A planetary roller screw transmission mechanism with a simple structure is constructed as follows Figures 1 to 4 As shown, it includes an intermediate screw rod 1, a nut seat 2 and a plurality of roller bodies 3 distributed in an annular shape arranged between the intermediate screw rod 1 and the nut seat 2, two symmetrically distributed inner gear rings 4 are arranged between the nut seat 2 and the roller bodies 3, and the inner side wall of each inner gear ring 4 is provided with a plurality of inner gear keys 5 evenly distributed in an annular shape, and both ends of the roller bodies 3 are provided with outer gear rings 6, and the surface of each outer gear ring 6 is provided with a plurality of outer gear keys 7 evenly distributed in an annular shape; the outer gear keys 7 and the inner gear keys 5 are meshingly connected, and both the outer gear keys 7 and the inner gear keys 5 are herringbone structures.

[0019] A limiting annular groove 8 is provided on the inner side wall of the nut seat 2 at a position corresponding to each inner gear ring 4; an oil storage chamber 9 is provided in the outer gear ring 6, and each of the outer gear keys 7 is provided with a lubrication channel connected to the oil storage chamber 9, and each lubrication channel is connected to an oil outlet hole 11 located on the side of the outer gear key 7; an oil filling hole 12 is provided on the oil storage chamber 9, and the oil filling hole 12 is arranged on the outer side surface of the outer gear ring 6; a sealing cover 13 is threadedly installed on the oil filling hole 12; the oil outlet hole 11 is arranged in the middle of the side of the outer gear key 7; an internal thread section is provided on the inner side wall of the nut seat 2 at a position corresponding to the middle of the two inner gear rings 4; an external thread section matching the internal thread section is provided on the roller body 3 at a position corresponding to the position between the two outer gear rings 6; a thread section matching the external thread section is provided on the surface of the intermediate screw rod 1.

[0020] Working principle: When in use, the intermediate screw 1 is driven by a driving motor to rotate. After the intermediate screw 1 rotates, transmission is generated between it and the roller body 3, so that the roller body 3 rotates. During the rotation of the roller body 3, the outer gear ring 6 and the outer tooth key 7 on the outer gear ring 6 are driven to rotate. Because the inner tooth key 5 is meshed with the outer tooth key 7, when the outer tooth key 7 rotates with the outer gear ring 6, it will mesh with the inner tooth key 5. Transmission; at the same time, because the inner gear ring 4 is installed on the nut seat 2, the inner side wall of the nut seat 2 is provided with an inner thread section threadedly connected with the outer thread section on the roller body 3, so that the roller body 3 can rotate with the intermediate screw 1 as the center, so that the nut seat 2 can move linearly along the intermediate screw 1; at the same time, because an oil storage chamber 9 is provided in the outer gear ring 6, when the outer gear ring 6 rotates with the roller body 3, the emulsified oil in the oil storage chamber 9 will enter the lubrication channel on the outer tooth key 7, and flow to the surface of the outer tooth key 7 through the oil outlet hole 11, With the meshing transmission between the external tooth key 7 and the internal tooth key 5, and the herringbone-shaped surfaces of the internal tooth key 5 and the external tooth key 7, the lubrication can flow to various positions of the internal tooth key 5 and the external tooth key 7, thereby ensuring the lubrication effect; and because the internal tooth key 5 and the external tooth key 7 are in a herringbone shape as a whole, that is, two groups of oblique helical gears are provided on the internal tooth key 5 and the external tooth key 7, so that during the transmission process, one group of oblique tooth keys can offset the thrust of the other group of oblique tooth keys, thereby ensuring high-speed and smooth transmission between the roller body 3 and the nut seat 2, and ensuring the transmission rate; at the same time, because the herringbone-shaped internal tooth key 5 and the external tooth key 7 have two oblique directions, when not working, a certain position limitation will be formed between the oblique tooth keys, thereby avoiding the roller body 3 from falling out from between the nut seat 2 and the intermediate screw 1, thereby ensuring the structural stability and also making the entire planetary roller screw do not need to additionally set a guide ring for fixing the roller body, thereby making the structure of the entire planetary roller screw simpler.

Claims

1. A planetary roller screw transmission mechanism with a simple structure, comprising an intermediate screw rod (1), a nut seat (2) and a plurality of roller bodies (3) arranged in an annular shape between the intermediate screw rod (1) and the nut seat (2), characterized in that: Two symmetrically distributed inner tooth rings (4) are arranged between the nut seat (2) and the roller body (3); a plurality of annularly evenly distributed inner tooth keys (5) are arranged on the inner side wall of each inner tooth ring (4); outer tooth rings (6) are arranged at both ends of the roller body (3); a plurality of annularly evenly distributed outer tooth keys (7) are arranged on the surface of each outer tooth ring (6); the outer tooth keys (7) and the inner tooth keys (5) are meshingly connected; the outer tooth keys (7) and the inner tooth keys (5) are both of a herringbone structure.

2. The planetary roller screw transmission mechanism with a simple structure according to claim 1 is characterized in that: A limiting annular groove (8) is provided on the inner side wall of the nut seat (2) at a position corresponding to each inner gear ring (4).

3. The planetary roller screw transmission mechanism with a simple structure according to claim 1, characterized in that: An oil storage chamber (9) is provided in the outer gear ring (6), and each of the outer gear keys (7) is provided with a lubrication channel connected to the oil storage chamber (9), and each lubrication channel is connected to an oil outlet hole (11) located on the side of the outer gear key (7).

4. The planetary roller screw transmission mechanism with a simple structure according to claim 3 is characterized in that: The oil storage cavity (9) is provided with an oil filling hole (12), which is arranged on the outer side surface of the outer gear ring (6); a sealing cover (13) is threadedly mounted on the oil filling hole (12).

5. The planetary roller screw transmission mechanism with a simple structure according to claim 3 is characterized in that: The oil outlet hole (11) is arranged in the middle of the side surface of the external tooth key (7).

6. The planetary roller screw transmission mechanism with a simple structure according to any one of claims 1 to 5, characterized in that: An internal thread section is provided on the inner side wall of the nut seat (2) at a position corresponding to the middle of the two internal gear rings (4); an external thread section matching the internal thread section is provided on the roller body (3) at a position corresponding to the middle of the two external gear rings (6); and a thread section matching the external thread section is provided on the surface of the intermediate screw rod (1).

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