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CN-122014820-A - Reverse transition groove row planetary roller screw

CN122014820ACN 122014820 ACN122014820 ACN 122014820ACN-122014820-A

Abstract

The invention discloses a reverse transition groove row planetary roller screw which comprises a screw rod, nuts, a plurality of rollers, a plurality of transmission sections, a planetary carrier, a plurality of transmission sections and a plurality of transmission sections, wherein a plurality of first ring grooves which are parallel to each other are formed in the outer side wall of the screw rod along the axial direction of the screw rod, the first ring grooves are divided into a plurality of ring groove groups, the distance between every two adjacent ring groove groups is d, the nuts are coaxially sleeved on the outer side of the screw rod, the plurality of rollers are annularly distributed between the screw rod and the nuts, the plurality of rollers are arranged on the outer side wall of the screw rod through the planetary carrier, the axial direction of each roller is parallel to the screw rod, the transmission section is provided with a second ring groove which is parallel to each other, and the transmission section on each roller is opposite to one ring groove group and is meshed with the nuts and the screw rod through the transmission section. According to the planetary roller screw, the ring grooves of the rollers are matched with the ring grooves of the screw rod, the ring grooves of the rollers are matched with the threads of the nut, and the non-self-locking and constant lead running of the planetary roller screw is realized by combining the offset design of the intervals among a plurality of groups of ring grooves on the screw rod.

Inventors

  • WANG JIANBO

Assignees

  • 江苏润孚动力科技有限公司

Dates

Publication Date
20260512
Application Date
20260413

Claims (10)

  1. 1. A reverse transition groove row star roller screw is characterized by comprising: The screw rod (1), the outer side wall of the screw rod (1) is provided with a plurality of first annular grooves (11) which are parallel to each other along the axial direction of the screw rod, the first annular grooves (11) are divided into a plurality of annular groove groups (12), and the distance between the adjacent annular groove groups (12) is d; The nut (2) is coaxially sleeved on the outer side of the screw rod (1); The novel screw nut comprises a screw rod (1) and a nut (2), wherein a plurality of rollers (4) are annularly distributed between the screw rod (1) and the nut (2), the rollers (4) are installed on the outer side wall of the screw rod (1) through a planet carrier (3), the axial direction of each roller (4) is parallel to the screw rod (1), each roller (4) is provided with a transmission section (43), each transmission section (43) is provided with a second annular groove (45) which is parallel to each other, each transmission section (43) on each roller (4) is oppositely arranged with one annular groove group (12), the pitch of the nut (2), the groove distance between adjacent first annular grooves (11) in the same annular groove group (12) and the groove distance between adjacent second annular grooves (45) are equal, and each roller (4) is meshed with the nut (2) and the screw rod (1) through the transmission section (43).
  2. 2. The reverse-type transition groove row planetary roller screw as claimed in claim 1, wherein the number of heads of the nut (2) is n, n is equal to or greater than 1, the plurality of rollers (4) comprises n reference rollers (41) and 0 or more auxiliary rollers (42), and n reference rollers (41) are meshed with the same ring groove group (12).
  3. 3. The reverse-type transition groove row planetary roller screw as claimed in claim 2, wherein n reference rollers (41) are circumferentially uniformly distributed on the periphery of the screw (1), and an included angle between adjacent reference rollers (41) is beta=360°/n.
  4. 4. The reverse transition groove row planetary roller screw as claimed in claim 2, wherein the region between adjacent reference rollers (41) is a design region, the ring groove group (12) opposite to the transmission section (43) on the reference rollers (41) is a reference groove group, the reference groove group is the 0 th ring groove group (12), and the distance between the i-th ring groove group (12) and the i-1 th ring groove group (12) is along the axial direction of the screw (1) Wherein M is the screw pitch of the nut, Is the included angle between the auxiliary roller (42) corresponding to the kth annular groove group (12) and a reference roller (41) at the end of the design interval where the auxiliary roller is positioned, and k=i or i-1.
  5. 5. A reverse-type transition groove row planetary roller screw according to any of the claims 1-4, characterized in that the total number of rollers (4) is at least three, of which plurality of rollers (4), at least three rollers (4) are solid.
  6. 6. The reverse transition groove row planetary roller screw as claimed in claim 1, wherein a plurality of rollers (4) are circumferentially uniformly distributed on the periphery of the screw (1).
  7. 7. The reverse type transition groove row planetary roller screw rod according to claim 1, wherein a limiting piece (5) is arranged on the screw rod (1), and the limiting piece (5) is used for limiting axial sliding of the planet carrier (3).
  8. 8. The reverse type transition groove row planetary roller screw rod according to claim 7, wherein the limiting piece (5) is provided with two embedding grooves (13) which are respectively positioned at two ends of the planet carrier (3), and the limiting piece (5) is embedded in the screw rod (1).
  9. 9. The reverse transition groove row planetary roller screw as claimed in claim 1, wherein the end of the planet carrier (3) is provided with a round hole (32) for inserting the end of the roller (4).
  10. 10. The reverse-type transition groove row planetary roller screw as claimed in claim 9, wherein the end of the roller (4) is provided with a connecting section (44), a step surface which is arranged towards the connecting section (44) is arranged between the connecting section (44) and the roller (4) main body, and when the connecting section (44) is inserted into the round hole (32), the step surface is abutted with the end of the planet carrier (3).

Description

Reverse transition groove row planetary roller screw Technical Field The invention relates to the field of transmission devices, in particular to a roller screw, and particularly relates to a reverse transition groove row star roller screw. Background The planetary roller screw rod is used as a key transmission mechanism for realizing the conversion between the spiral motion and the linear motion, and the planetary roller screw rod transmits power through the spiral meshing of the screw rod, the roller and the nut, and has the advantages of high bearing capacity, long service life, wide speed range and the like. In various configurations, the reverse planetary roller screw has a particularly compact radial structure due to the arrangement of a built-in screw and a long nut housing, and is particularly suitable for a precise scene with limited space, such as a robot joint or a new energy automobile braking system. However, the existing reverse planetary roller screw pair cannot meet the comprehensive requirements of large bearing, medium and small lead, constant lead, no self-locking of motion reverse transmission and high-precision large-scale low-cost mass production. The traditional reverse planetary roller screw, such as RVI series in a Swiss ROLLVIS sample book, has the advantages of 1.5mm minimum practical lead, constant lead, no self-locking motion feedback, large bearing capacity, high DN value and high rotational speed input, but because the roller is a complex of an external gear and an external thread, the screw rod is also a complex of the external gear and the external thread, and has large manufacturing difficulty, high cost and large mass production difficulty. When the lead is lower than 1mm, the diameter of the nut is large, and the application range is limited. Cannot be used in the fields of dexterous hands with smaller size and volume. Patent application CN120426368a discloses a reverse gearless planetary roller screw comprising a screw rod, a long nut, a planet carrier assembly and a plurality of rollers. The motion back transmission is not self-locking, the bearing capacity is large, the DN value is high, the rotation speed input can be high, the manufacturing difficulty is lower than that of the traditional reverse planetary roller screw, the cost is slightly low, and the ultra-large scale production difficulty is large. When the lead is lower than 1mm, the diameter of the nut is large, and the application range is limited. And the method can not be used in the fields of dexterous hands with smaller size and volume. Patent CN104675946B discloses a differential planetary roller screw (reverse differential planetary roller screw) in which the rollers are of a stepped structure without a threaded ring groove, and the stepped structure corresponding to the rollers of the screw has no threaded ring groove. The lead is large in bearing, high in DN value, capable of inputting at high rotation speed, small in lead, and capable of realizing mass production in large scale and low in cost, the lead of the product is not constant, closed-loop control processing is needed to be carried out with a displacement sensor during application, and the application range is greatly limited. The product has self-locking characteristic and can not be transmitted reversely. In mainstream applications, anti-transmission is required and cannot be self-locked. Disclosure of Invention The invention aims to solve the technical problems of large bearing, low and medium lead, constant lead, no self-locking of motion feedback and high-precision large-scale low-cost mass production. The invention provides a reverse transition groove row star roller screw. The technical scheme adopted by the invention for solving the technical problems is that the reverse transition groove row planetary roller screw comprises: The screw rod is provided with a plurality of first ring grooves which are parallel to each other along the axial direction, the first ring grooves are divided into a plurality of ring groove groups, and the interval between the adjacent ring groove groups is d; the nut is coaxially sleeved on the outer side of the screw rod; The novel screw nut comprises a screw rod and a nut, wherein a plurality of rollers are annularly distributed between the screw rod and the nut, the rollers are mounted on the outer side wall of the screw rod through a planet carrier, the axial directions of the rollers are mutually parallel to the screw rod, each roller is provided with a transmission section, each transmission section is provided with a mutually parallel second annular groove, each transmission section on the roller is oppositely arranged with one annular groove group, the screw pitch of the nut, the groove distance between adjacent first annular grooves in the same annular groove group, and the groove distance between adjacent second annular grooves are equal, and the rollers are meshed with the nut and the screw rod throug