CN114623217A - Annular tooth roller screw rod transmission mechanism - Google Patents

Annular tooth roller screw rod transmission mechanism Download PDF

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Publication number
CN114623217A
CN114623217A CN202210213878.8A CN202210213878A CN114623217A CN 114623217 A CN114623217 A CN 114623217A CN 202210213878 A CN202210213878 A CN 202210213878A CN 114623217 A CN114623217 A CN 114623217A
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CN
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Prior art keywords
roller
nut
screw
rollers
teeth
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Pending
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CN202210213878.8A
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Chinese (zh)
Inventor
付晓军
刘更
李欣
马尚君
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Northwestern Polytechnical University
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Northwestern Polytechnical University
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Priority to CN202210213878.8A priority Critical patent/CN114623217A/en
Publication of CN114623217A publication Critical patent/CN114623217A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
    • F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
    • F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
    • F16H25/2252—Planetary rollers between nut and screw
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
    • F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
    • F16H2025/2271—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers with means for guiding circulating rollers

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

The invention provides an annular tooth roller screw rod transmission mechanism which comprises a screw rod, rollers, nuts, a retainer, an inner gear ring and a positioning pin, wherein the screw rod is a multi-head external thread, two ends of each roller are provided with optical axes, the middle section of each roller is provided with a plurality of annular convex teeth, and straight teeth are processed at two ends of each roller; the rollers are distributed around the screw rod, and the convex teeth of the rollers are meshed with the screw rod threads; the inner part of the nut is provided with annular concave teeth which are meshed with the roller annular convex teeth; the inner gear ring is arranged in a groove on the inner wall of the nut, the installation phase angle is fixed, and straight teeth of the inner gear ring are meshed with straight teeth of the roller; the retainer is arranged in a groove on the inner wall of the nut, and the optical axes at the two ends of the roller are matched with the U-shaped groove of the retainer. The invention can obtain a smaller radial size than a standard planetary roller screw under the condition of the same screw pitch diameter; and the characteristic of uneven bearing of multiple threads of the long roller can be improved by utilizing multiple groups of rollers.

Description

Annular tooth roller screw rod transmission mechanism
Technical Field
The invention belongs to the technical field of mechanical transmission, and particularly relates to a roller screw transmission mechanism which is particularly suitable for heavy-load working condition transmission in a limited installation space.
Background
The planetary roller screw is a precise transmission mechanism and a rolling functional component which transmit power and motion through the curved surface meshing among a plurality of rollers, a screw rod and a nut. The planetary roller screw is used as an actuating mechanism of an electromechanical servo system, can greatly improve the power density of the electromechanical servo system, can replace a high-thrust hydraulic and pneumatic servo system, and thoroughly solves the problems of 'running, overflowing, dripping and leaking', so that the planetary roller screw has far-reaching significance for remarkably improving the operating efficiency of mechanical equipment, reducing the maintenance cost, promoting the rapid development of fully electric intelligent equipment and promoting the development of low-carbon environment-friendly economy. At present, the planetary roller screw is applied to the fields of all-electric/multi-electric equipment such as aircraft control surfaces, tank high-low direction driving, ship stabilizers, six-degree-of-freedom platforms, welding robots and precision numerical control machine tool feeding, and has wide application prospects in all-electric development of mechanical equipment in various military and civil industries such as aviation, aerospace, vehicles, petrifaction and robots.
When the planetary roller screw is used for replacing high-thrust hydraulic transmission, the problem that the radial size is too large, and the related mechanical equipment cannot be installed exists. This is due to the fact that in a standard planetary roller screw, the screw diameter, the roller diameter and the nut diameter must satisfy: dn＝NdrAnd d isr＝dsV (N-2) wherein ds、drAnd dnThe pitch diameters of the screw rod, the roller and the nut are respectively, and N is the number of the screw threads of the screw rod and the nut. (comprehensive product manual of Servo electric cylinder and planetary roller screw [ M)]Tokyo, dao chen science and technology development (beijing) ltd, 2010, www.doson-inc.com; satellite roller reviews [ M]Geneva: Rollvis,2019, www.Rollvis.com). When the pitch diameter of the screw rod is increased, the pitch diameter of the roller is in accordance with dr＝dsThe proportional relationship of (N-2) increases and the radial dimension of the planetary roller screw increases significantly. The standard planetary roller screw can reduce the diameter of the roller by increasing the number N of screw thread heads, thereby reducing the radial size of the mechanism. However, the number of nut threads increases with the number of screw threads N, which significantly increases the difficulty and cost of grinding the nut internal threads. Meanwhile, when the thread pitch is fixed, the number of the thread heads of the nut is increased, the lead and the lead angle of the corresponding threads are increased, the inclination angle of the grinding wheel spindle of the thread grinding is increased, and the minimum radial dimension and the length of the nut are further limited. In addition, due to structural limitations and load bearing requirements, the number of screw thread starts of a standard planetary roller screw cannot be increased substantially.
In a recirculating planetary roller screw, although the pitch diameter of the screw is not proportional to the pitch diameter of the rollers, the rollers travel along the nut threads and must be returned to their original positions at intervals by a particular structure or means. In addition, due to the difference in the lead angle, the roller and the nut are always in a relative sliding state at the contact point. This makes the motion of the rollers discontinuous and inefficient during operation of the recirculating planetary roller screw.
In addition, the phenomenon of uneven load distribution is aggravated by excessive thread teeth on a single roller (Zhang Wenje. planetary roller screw pair thread tooth load distribution calculation model and method [ D ]. Sa An: Phi doctor paper of northwest university, 2017). Secondly, the larger the diameter of the roller, the more uneven the load distribution of the roller on the screw-side and nut-side threads (Blinov D S, Morozov M I. New load distribution strips of rollers and screens with a nut of the planar roller drive [ J ]. Science and discovery of the Bauman MSTU,2014,9: 1-14). This also limits the increase in the carrying capacity of the heavy-duty planetary roller screw. Finally, the phase matching between the existing planetary roller screw product and the nut threads and the straight teeth of the inner gear ring needs to be considered simultaneously in the roller assembly process, so that the assembly complexity is increased.
The patent "a planetary roller screw CN 201210078456.0" shows a planetary roller screw with a screw structure and rollers and a nut in a ring tooth structure, which is used to reduce the axial volume of the whole device and facilitate the assembly and disassembly. The patent teaches that the number of rollers in the planetary roller screw is one or more, typically 2 or more, up to a limit where the rollers do not interfere with each other. However, due to the common constraints of the lead screw lead angle and the nut ring tooth structure, if the number of rollers and the number of screw heads are not matched, the rollers and the screw can interfere with each other. For example: when the number of the screw thread heads of the screw rod is 5, the rollers are uniformly distributed around the screw rod, and if the number of the rollers is more than 2 and not equal to 5, the rollers interfere with the screw rod, so that the mechanism cannot be assembled. The patent "a planetary roller screw CN 201210078456.0" does not describe this problem. In addition, the structure of the patent can not realize the parallel assembly of a plurality of groups of rollers.
The 'planet roller screw CN202010986386.3 with gear transmission mode', 'ring gear nut planet roller screw CN 202010984767.8' and 'planet roller screw transmission mechanism CN 201210504715.1' all adopt the mode that both ends of the nut are meshed with the roller to transmit the nut load, on one hand, the contact section is shorter, thereby limiting the maximum bearing capacity of the planet roller screw. Secondly, the design that the meshing point of the roller, the screw rod and the nut is not in the same section of structure can lead the roller to bear large bending moment under the heavy load working condition. The rollers are usually slender structural members and are difficult to bear bending moment load; if the bending resistance is enhanced by increasing the diameter of the roller, the outer diameter of the nut is greatly increased. The patent 'a planet roller screw CN 202010485426.6' adopts the structure that two ends of a roller are additionally provided with a middle section of annular teeth and are meshed with a nut, so that the stress state of the roller is improved, but if the same number of contact points as a standard planet roller screw (a servo electric cylinder and a planet roller screw comprehensive product manual [ M ]. Beijing: Daochen scientific and technological development (Beijing) Limited company) are reached on a single roller, the length of the roller in the invention is 2 times of that of the roller in the standard planet roller screw. In addition, the rollers in the patent "a planetary roller screw CN 202010485426.6" still bear bending moment load, which is not beneficial to the structural design of small diameter rollers. The patent 'a nut type gearless constant lead planetary roller screw ZL 202010800383.6' belongs to the improved design of a reverse planetary roller screw structure, and the diameters of the screw and the roller must meet a certain proportional relation.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an annular tooth roller screw transmission mechanism which can obtain a smaller radial size than a standard planetary roller screw under the condition of the same screw middle diameter; the characteristic of uneven load bearing of multiple threads of the long roller is improved by utilizing multiple groups of rollers.
The technical scheme adopted by the invention for solving the technical problems is as follows: a transmission mechanism of a ring-shaped tooth roller screw rod comprises a screw rod, a roller, a nut, a retainer, an inner gear ring and a positioning pin.
The screw rod is a multi-head external threadThe number of the heads of the lines is N, and the thread pitch is P; two ends of the roller are optical axes, the middle section of the roller is provided with a plurality of annular convex teeth, straight teeth are machined at two ends of the annular convex teeth along the circumferential direction, and the distance between the annular convex teeth is equal to the screw pitch P of the screw rod; the rollers are distributed around the screw rod, the convex teeth of the rollers are meshed with the screw rod threads, and the number R of the rollers must meet the requirement that R is N/Z, wherein Z is a positive integer, and Z is 1, 2 or 3 …; the nut is internally provided with annular concave teeth, and a plurality of circumferential grooves are formed in the nut along the axial direction; the nut annular concave teeth are meshed with the roller annular convex teeth; the retainer is of an annular structure with a cut-off opening, and a plurality of U-shaped grooves are uniformly distributed on the inner wall of the retainer along the circumferential direction; the inner gear ring is provided with an annular structure for cutting off the opening, a plurality of straight teeth are uniformly distributed on the inner wall along the circumferential direction, and a radial positioning pin hole is formed in the outer wall of the inner gear ring; the number z of straight teeth of the rollerrAnd the number z of straight teeth of the nutnSatisfy dr/dn＝zr/znProportional relation of (d)rAnd dnThe pitch diameters of the roller and the nut are respectively; the inner gear ring is arranged in a groove on the inner wall of the nut, a positioning pin is used for fixing a mounting phase angle of the inner gear ring, and a straight tooth of the inner gear ring is meshed with a straight tooth of the roller; the retainer is arranged in a groove in the inner wall of the nut, and optical axes at two ends of the roller are matched with a U-shaped groove of the retainer.
Further, a plurality of rollers having the same axial position around the screw are defined as 1 group, and X groups are installed in the screw axial direction, where X is 1, 2, and 3 ….
Furthermore, when more than 2 groups of rollers are provided, different meshing gaps are designed among the rollers and the screw rod and the nut according to the external load state borne by the nut and the screw rod, so that the rollers in each group bear the same load.
Further, the rollers in a set of rollers are mounted at an angular spacing equal to Z x 360/N.
Furthermore, a process groove is formed in the inner wall of the retainer between every two adjacent U-shaped grooves.
The beneficial effects of the invention are:
the invention provides an annular tooth roller screw rod, which is characterized in that the screw rod is a multi-head external thread, the number of heads of the thread is N, and a roller and a nut are respectively provided with an annular convex tooth and a nutA dentoid structure; the rollers are distributed around the screw rod, the convex teeth of the rollers are meshed with the screw rod threads, and the number R of the rollers must meet the requirement that R is N/Z, wherein Z is a positive integer, and Z is 1, 2 or 3 …; the angular separation of the rollers in a set of rollers may be equal to Z × 360 °/N, where N is the number of lead screw heads, Z is a positive integer, and Z is 1, 2, 3 …. The structure and the parameter relation can ensure that a plurality of rollers in the same group are in the same axial position, and further can meet the requirement that the rollers are meshed with the nut and the screw rod simultaneously. The beneficial effect of the structure is that the middle diameter d of the screw rodsAnd the pitch diameter d of the rollerrHas no d in betweenr＝ds/(N-2) proportional constraint with nut pitch diameter dnAnd the pitch diameter d of the rollerrHas no d in betweenn＝NdrWherein N is the number of lead screw threads. The pitch diameter of the roller can be far smaller than that of the lead screw, and when the diameter of the lead screw is a fixed value, the radial size of the whole transmission mechanism is greatly reduced. The nut is of an annular concave tooth structure, and the problem of grinding the inclined angle of the grinding wheel shaft does not need to be considered in the grinding process. The processing difficulty of the nut cannot be increased along with the increase of the number of the screw heads of the screw rod. The number of the screw heads of the lead screw is selected without considering the influence on the diameter of the roller, and the lead screw with larger lead can be obtained, so that the transmission speed and the transmission efficiency of the transmission mechanism are improved.
In addition, because the roller and the nut are designed by the annular teeth, the roller and the nut do not move axially relative to each other, and the roller does not need to return to the initial position through a special structure or a device. The annular teeth of the roller and the nut are parallel to each other, so that the theoretical meshing point of the two parts can be ensured to be positioned at the tangent point of the intermediate diameter circle, the roller can perform pure rolling motion in the nut, and the sliding between the roller and the nut is reduced.
The invention can realize the assembly of a plurality of groups of rollers and can decompose the long roller in the original heavy-load planetary roller screw into a plurality of short rollers for carrying together. The number of threads on a single roller can be reduced, and meanwhile, different assembly gaps can be formed among the rollers, the lead screw and the nut, so that the rollers bear the same load, and the bearing capacity is improved. The pitch diameter of the roller can be far smaller than that of the screw rod, and the problem that the load distribution of the roller on the screw rod side and the nut side is seriously uneven due to the overlarge diameter of the roller can be solved (Blinov D S, Morozov M I.Unaven load distribution in the threads of roller and screw with the nut of the planar roller drive [ J ]. Science and edition of the Bauman MSTU,2014,9: 1-14).
The relative axial positions of the rollers and the nut cannot be influenced by the rotation of the rollers around the axes of the rollers, so that the phase matching problem of the rollers and the nut and the phase matching problem of the rollers and the inner gear ring do not need to be considered in the assembling process. The roller has the contact sections with the same length on the screw rod side and the nut side, so that the bearing capacity of the mechanism under the unit axial length is improved, and the roller is prevented from being subjected to overlarge bending moment load.
The invention can greatly improve the thrust-weight ratio of the heavy-duty planetary roller screw and reduce the radial size of the transmission mechanism. The system has far-reaching significance for pushing an electromechanical servo system to replace a high-thrust hydraulic and pneumatic servo system, thoroughly solving the problems of 'running, overflowing, dripping and leaking', improving the operating efficiency of mechanical equipment, reducing the maintenance cost, promoting the rapid development of fully-electric intelligent equipment and pushing the low-carbon environment-friendly economic development.
Drawings
FIG. 1 is a perspective view of an annular toothed roller screw drive;
FIG. 2 is a perspective view of the lead screw;
FIG. 3 is a perspective view of a roller arrangement;
FIG. 4 is a perspective view of the nut structure;
FIG. 5 is a schematic plan view of a nut construction;
FIG. 6 is a perspective view of the cage construction;
fig. 7 is a perspective view of an inner gear ring structure;
FIG. 8 is a perspective view of a locating pin construction;
FIG. 9 is a schematic sectional view showing the engagement of the spur teeth of the rollers and the ring gear;
FIG. 10 is a schematic cross-sectional view of the roller ring ridge and nut ring ridge and screw thread engagement;
FIG. 11 is a perspective view of an annular toothed roller screw drive having 1 set of rollers;
fig. 12 is a perspective view of an annular toothed roller screw drive with 3 sets of rollers.
Detailed Description
The present invention will be further described with reference to the following drawings and examples, which include, but are not limited to, the following examples.
The invention provides an annular tooth roller screw transmission mechanism which comprises a screw, rollers, nuts, a retainer, an inner gear ring and a positioning pin. The screw rod is a multi-head external thread, the number of the heads of the threads is N, and the thread pitch is P; the roller is provided with a plurality of annular convex teeth, the distance between the annular convex teeth is equal to the screw pitch P of the screw rod, and straight teeth are processed at two ends of the annular convex teeth; the rollers are distributed around the screw rod, the convex teeth of the rollers are meshed with the screw rod threads, and the number R of the rollers must meet the requirement that R is N/Z, wherein Z is a positive integer, and Z is 1, 2 or 3 …; lead screw pitch diameter dsAnd the pitch diameter d of the rollerrHas no d in betweenr＝ds/(N-2) proportional constraints; the nut is internally provided with annular concave teeth, and a groove matched with the retainer and the inner gear ring is formed in the nut; the nut annular concave teeth are meshed with the roller annular convex teeth; because the roller and the nut are designed by adopting the annular teeth, the pitch diameter d of the nutnAnd the pitch diameter d of the rollerrHas no d in betweenn＝NdrA proportional relationship constraint of; the retainer is provided with a U-shaped groove and a cut-off opening; the inner gear ring is a thin-wall structural part and is provided with straight teeth, a positioning pin hole and a cut-off opening. Number z of straight teeth of rollerrNumber z of nut straight teethnIs required to satisfy dr/dn＝zr/znThe proportional relationship of (a); the inner gear ring is reduced in outer diameter through elastic deformation, and after the inner gear ring is installed in a corresponding groove in the nut, the elastic deformation is released to enable the inner gear ring to recover the original size. Subsequently, fixing the mounting phase angle of the ring gear by using a positioning pin; the outer diameter of the retainer is also reduced through elastic deformation, and the retainer is arranged in a corresponding groove in the nut and then releases the elastic deformation to restore the original size.
Further, defining a plurality of rollers having the same axial position around the screw as 1 group, X groups may be installed in the ring-tooth roller screw, where X may be equal to 1, 2, 3 …. The long roller in the original heavy-load planetary roller screw is decomposed into a plurality of short rollers for carrying together.
Furthermore, when more than 2 groups of rollers are provided, namely X is more than or equal to 2, different meshing gaps can be designed among the rollers of each group and the screw rod and the nut according to the external load state borne by the nut and the screw rod, so that the rollers of each group bear the same load.
Furthermore, the retainer can be processed with a process groove for improving the elastic deformation of the retainer so as to facilitate the reduction of the outer diameter and the installation of the retainer into the nut.
Further, the mounting interval angle of each roller in a group of rollers can be equal to Z multiplied by 360 DEG/N, wherein N is the number of screw heads, Z is a positive integer, and Z is 1, 2, 3 ….
Further, the pitch diameter of the roller can be far smaller than that of the screw rod; when the diameter of the lead screw is a fixed value, the radial size of the whole transmission mechanism is greatly reduced. The nut is in an annular concave tooth structure, and the problem of grinding wheel spindle inclination angle does not need to be considered in the grinding process.
As shown in fig. 1, an embodiment of the present invention provides an annular toothed roller screw transmission mechanism, which includes a screw 1, rollers 2, a nut 3, a retainer 4, an inner gear ring 5, a positioning pin 6, and other parts.
As shown in FIG. 2, in the embodiment of the present invention, the screw shaft 1 is a multi-thread, and in the embodiment, the number of the thread heads of the screw shaft 1 is NsThe pitch P is 2mm and the pitch diameter of the screw 1 is 75mm (20).
As shown in fig. 3, in the embodiment of the present invention, the middle section of the roller 2 is provided with a plurality of annular convex teeth 2-3, and the distance between the annular convex teeth 2-3 is equal to the screw pitch P of the screw rod which is 2 mm; the two ends of the roller 2 are optical axes 2-1; the optical axis 2-1 is matched with a U-shaped groove 4-1 in the retainer 4; two ends of the annular convex teeth 2-3 in the roller 2 are provided with straight teeth 2-2 of the roller; the straight tooth 2-2 of the roller is meshed with the straight tooth 5-1 of the inner gear ring. In this embodiment, the number of teeth of the roller spur 2-2 is zr10, the pitch circle diameter of the roller annular convex teeth 2-3 is dr10mm, the number of rollers in a group is Nr＝Ns＝20。
As shown in fig. 4 and 5, in the embodiment of the present invention, the nut 3 has two sets of annular concave teeth 3-3, and the distance between the annular concave teeth 3-3 is equal to 2mm of the screw pitch P; an inner gear ring mounting groove 3-2 and a retainer mounting groove 3-1 are arranged in the nut 3; a positioning pin through hole 3-4 is processed in the internal gear ring mounting groove 3-2; a disassembly through hole 3-5 is processed in the retainer mounting groove 3-1. In the embodiment, the diameter of the pitch circle of the annular concave teeth 3-3 of the nut 3 is dn95 mm. The outer diameter of the nut 3 in this embodiment is 115 mm. In the Rollvis product, the minimum outer diameter of the nut is 150mm when the diameter of the screw is 75mm (Satellite roller reviews M].Geneva:Rollvis,2019,www.Rollvis.com)。
As shown in fig. 6, in the embodiment of the present invention, the holder 4 has a plurality of U-shaped grooves 4-1 uniformly distributed; process grooves 4-2 are arranged in the interval of each U-shaped groove 4-1; a cut-off opening 4-3 is provided in the holder 4.
As shown in fig. 7, in the embodiment of the present invention, the ring gear 5 is a thin-walled structure, and the number of the ring gear straight teeth 5-1 in the embodiment is zn＝zr/(dr/dn) 95; the internal gear ring 5 is provided with a positioning pin hole 5-2 and a cut-off opening 5-3.
As shown in fig. 8, in the embodiment of the present invention, the positioning pin 6 has a stepped structure, in which a large end 6-1 is engaged with the positioning pin hole 5-2 of the ring gear, and a small end 6-2 is engaged with the through hole 3-4 of the nut positioning pin.
In the embodiment, the outer diameters of the 4 inner gear rings 5 are reduced through elastic deformation, the inner gear rings are arranged in the corresponding inner gear ring mounting grooves 3-2 in the nuts 3, and then the elastic deformation is released to restore the original sizes. And thirdly, fixing the installation phase angle of the inner gear ring by matching the positioning pin 6 with the positioning pin hole 5-2 of the inner gear ring. The outer diameters of the 4 retainers 4 are reduced through elastic deformation, the retainers are arranged in corresponding retainer mounting grooves 3-1 in the nut 3, and then the elastic deformation is released to restore the original sizes. Subsequently, the rollers 2 are installed such that the annular male teeth 2-3 of the rollers 2 are engaged with the annular female teeth 3-3 of the nut 3, the straight teeth 2-2 of the rollers are engaged with the straight teeth 5-1 of the inner ring gear, and the optical axes 2-1 of the rollers 2 are fitted into the slots 4-3 in the holder 4.
In this example, a total of 2 sets of 40 rollers 2 are installed. And finally, the axis of the screw rod 1 is coincided with the axis of the nut 3, and the front end of the thread of the screw rod 1 is contacted with the annular convex teeth 2-3 of the roller 2. The screw is then rotated and a certain axial pressure is applied so that the annular ridges 2-3 of the respective rollers 2 engage the screw thread. And finishing the assembly of the annular tooth roller screw rod. The cross-sectional view of the meshing of the straight teeth 2-2 of the roller and the straight teeth 5-1 of the ring gear after the assembly is completed is shown in fig. 9. The roller ring-shaped male thread 2-3 and the nut ring-shaped female thread 3-3 and the screw 1 are in a cross-section schematically shown in fig. 10.
In this embodiment, the pitch diameter of the screw 1 is 75mm, and the outer diameter of the nut 3 is 115 mm. The outer diameter of the nut corresponding to the lead screw pitch diameter of 75mm in the Rollvis product is 150mm,
a complete endless toothed roller screw drive with 1 and 3 sets of rollers can be assembled as shown in figures 11 and 12 respectively.
The above disclosure is only one specific embodiment of the present invention, and those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention, however, the present invention is not limited to the embodiments, and any changes that can be made by those skilled in the art should fall within the scope of the present invention.

Claims (5)

1. A kind of annular tooth roller lead screw drive mechanism, including lead screw, roller, nut, cage, ring gear and locating pin, characterized by that, the said lead screw is the external screw thread of the multiple-start, the number of the threaded first is N, the pitch is P; two ends of the roller are optical axes, the middle section of the roller is provided with a plurality of annular convex teeth, straight teeth are machined at two ends of the annular convex teeth along the circumferential direction, and the distance between the annular convex teeth is equal to the screw pitch P of the screw rod; the rollers are distributed around the screw rod, the convex teeth of the rollers are meshed with the screw rod threads, and the number R of the rollers must meet the requirement that R is N/Z, wherein Z is a positive integer, and Z is 1, 2 or 3 …; the nut is internally provided with annular concave teeth, and a plurality of circumferential grooves are formed in the nut along the axial direction; the nut annular concave teeth are meshed with the roller annular convex teeth; the retainer is of an annular structure provided with a cut-off opening, and a plurality of U-shaped grooves are uniformly distributed on the inner wall of the retainer along the circumferential direction; the inner gear ring is provided with an annular structure with a cut-off opening, a plurality of straight teeth are uniformly distributed on the inner wall along the circumferential direction, and the outer wall of the inner gear ringA radial positioning pin hole is arranged; the number z of straight teeth of the rollerrAnd the number z of straight teeth of the nutnSatisfy dr/dn＝zr/znProportional relation of (d)rAnd dnThe pitch diameters of the roller and the nut are respectively; the inner gear ring is arranged in a groove on the inner wall of the nut, a positioning pin is used for fixing the installation phase angle of the inner gear ring, and the straight teeth of the inner gear ring are meshed with the straight teeth of the roller; the retainer is arranged in a groove in the inner wall of the nut, and optical axes at two ends of the roller are matched with a U-shaped groove of the retainer.
2. An annular toothed roller screw drive according to claim 1, characterized in that the rollers with the same axial position around the screw are defined as 1 group, and that X groups are mounted in the axial direction of the screw, X being 1, 2, 3 ….
3. An annular toothed roller screw drive according to claim 2, characterized in that with more than 2 groups of rollers, the different meshing clearances between the groups of rollers and the screw and nut are designed so that the groups of rollers are subjected to the same load, depending on the state of the external load to which the nut and screw are subjected.
4. An annular toothed roller screw transmission according to claim 2, characterized in that the rollers of a set are mounted at an angular interval equal to Z x 360 °/N.
5. An annular roller screw drive according to claim 1, wherein the inner cage wall is provided with a process groove between two adjacent U-shaped grooves.
CN202210213878.8A 2022-03-07 2022-03-07 Annular tooth roller screw rod transmission mechanism Pending CN114623217A (en)

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CN202210213878.8A CN114623217A (en) 2022-03-07 2022-03-07 Annular tooth roller screw rod transmission mechanism

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115111294A (en) * 2022-08-25 2022-09-27 杭州新剑机电传动股份有限公司 Electromechanical actuator for automobile suitable for brake-by-wire system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115111294A (en) * 2022-08-25 2022-09-27 杭州新剑机电传动股份有限公司 Electromechanical actuator for automobile suitable for brake-by-wire system
CN115111294B (en) * 2022-08-25 2022-12-16 杭州新剑机电传动股份有限公司 Electromechanical actuator for automobile suitable for brake-by-wire system

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