CN-121993558-A - Planetary roller screw mechanism

CN121993558ACN 121993558 ACN121993558 ACN 121993558ACN-121993558-A

Abstract

The invention relates to a planetary roller screw mechanism, which comprises a moving assembly, a nut assembly and a driving assembly, wherein the moving assembly comprises a moving piece which can move along a first direction. The nut assembly comprises a first nut, a push rod and a first bracket assembly, wherein the first nut extends along a second direction, the second direction is perpendicular to the first direction, the first nut is rotatably arranged on the moving part, one end of the push rod is provided with a first external tooth thread sleeve, and the first bracket assembly is sleeved on the outer side of the first external tooth thread sleeve and meshed with the inner wall of the first nut and the first external tooth thread sleeve. The driving assembly comprises a transmission part which is arranged along the first direction in a moving way, the transmission part and the moving part move at the same speed, and the transmission part is meshed and connected with the first nut. According to the planetary roller screw mechanism, the moving part of the moving assembly and the transmission part of the driving assembly move at the same speed and are matched with the nut assembly, so that the problem that the existing planetary roller screw mechanism is single in use mode can be solved.

Inventors

ZHANG KANGDONG
HUANG SHUIPING
LI WENSHENG
ZHENG CHEN
Lou Xinxin
Qian Chengang

Assignees

浙江非攻机械有限公司

Dates

Publication Date: 20260508
Application Date: 20251224

Claims (10)

1. A planetary roller screw mechanism, comprising: A moving assembly including a moving member provided to be movable in a first direction; The nut assembly comprises a first nut, a push rod and a first bracket assembly, wherein the first nut extends along a second direction, the second direction is perpendicular to the first direction, the first nut is rotatably arranged on the moving part, one end of the push rod is provided with a first external tooth thread sleeve, and the first bracket assembly is sleeved on the outer side of the first external tooth thread sleeve and meshed with the inner wall of the first nut and the first external tooth thread sleeve; The driving assembly comprises a transmission piece, the transmission piece is arranged to be movable along the first direction, the transmission piece and the moving piece move at the same speed, and the transmission piece is in meshed connection with the first nut.
2. The planetary roller screw mechanism according to claim 1, wherein the first bracket assembly comprises two first planetary carriers and a plurality of first rollers, the two first planetary carriers are respectively arranged on two sides of the first rollers, the outer wall of the first rollers is provided with threads, and the threads are meshed with the inner wall of the first nut and the outer wall of the first external tooth thread bush.
3. The planetary roller screw mechanism of claim 2, wherein the nut assembly further comprises a first presser removably disposed at one end of the pushrod, the pushrod being provided with a first stop, the first bracket assembly being clamped between the first presser and the first stop.
4. The planetary roller screw mechanism of claim 1, wherein the transmission is configured as a screw structure, the drive assembly comprising: A second nut extending in the first direction, the second nut is rotatably arranged; The second bracket component is sleeved at one end of the transmission piece, and is meshed with the inner part of the second nut and the outer wall of the transmission piece.
5. The planetary roller screw mechanism according to claim 4, wherein one end of the transmission member is provided with a second externally toothed threaded sleeve; The second support component comprises two second planet carriers and a plurality of second rollers, the two second planet carriers are respectively arranged on two sides of the second rollers, external threads are arranged on the outer walls of the second rollers, and the external threads are meshed with the inner wall of the transmission piece and the outer wall of the second external tooth thread sleeve.
6. The planetary roller screw mechanism according to claim 5, wherein the driving assembly further comprises a driving motor, the driving motor is connected with the second nut, and an output shaft of the driving motor is coaxially disposed with the second nut; And/or, the driving assembly further comprises a driving motor, a first meshing part is arranged on an output shaft of the driving motor, a second meshing part is arranged on the outer wall of the second nut, and the first meshing part is meshed with the second meshing part.
7. The planetary roller screw mechanism of claim 1, wherein the transmission is configured as a nut structure, the drive assembly further comprising: A driving motor; One end of the first screw rod is connected with the output shaft of the driving motor, and the transmission piece is sleeved on the first screw rod; The third bracket component is arranged in the transmission piece and meshed with the inner wall of the transmission piece and the outer wall of the first screw rod; The installation sleeve is arranged on the transmission part, the number of the installation sleeves is two, and the two installation sleeves are respectively arranged at the opposite ends of the third bracket component and limit the third bracket component to move along the axial direction.
8. The planetary roller screw mechanism according to claim 7, wherein the third carrier assembly comprises two third planetary carriers and a plurality of third rollers, the two third planetary carriers are respectively arranged on two opposite sides of the third rollers, the outer wall of the third rollers is provided with external threads, and the external threads are meshed with the internal threads of the transmission piece and the external threads of the first screw.
9. The planetary roller screw mechanism according to any one of claims 1-8, wherein the moving assembly includes a slide rail extending in the first direction, the moving member being movably disposed on the slide rail.
10. The planetary roller screw mechanism according to any one of claims 1 to 8, wherein a first bevel gear is provided at one end of the transmission member, the planetary roller screw mechanism further comprising a second bevel gear provided on the first nut and meshed with the first bevel gear.

Description

Planetary roller screw mechanism Technical Field The invention relates to the technical field of screws, in particular to a planetary roller screw mechanism. Background The screw rod is a mechanical device capable of mutually converting rotary motion and linear motion, the existing common high-efficiency screw rod mainly comprises two types, namely a roller screw rod and a planetary roller screw rod, the existing common high-efficiency screw rod comprises two types, namely a standard type planetary roller screw rod and a reverse type planetary roller screw rod, the standard type planetary roller screw rod is of a long screw rod and short nut structure, no axial relative motion exists between a roller and a nut, the reverse type planetary roller screw rod is of a short screw rod and long nut structure, and no axial relative motion exists between the roller and the screw rod. Because the planetary roller screw adopts the roller with threads to replace the roller as the force transmission unit, compared with the roller screw, the force transmission unit has larger contact radius and more contact points, so that rated load, rigidity, speed and service life are all improved, but the conventional planetary roller screw is single in use mode and cannot be suitable for complex working environments. Disclosure of Invention The invention aims to at least solve the problem that the existing planetary roller screw mechanism is single in use mode. The aim is achieved by the following technical scheme: the first aspect of the present invention proposes a planetary roller screw mechanism comprising: A moving assembly including a moving member provided to be movable in a first direction; The nut assembly comprises a first nut, a push rod and a first bracket assembly, wherein the first nut extends along a second direction, the second direction is perpendicular to the first direction, the first nut is rotatably arranged on the moving part, one end of the push rod is provided with a first external tooth thread sleeve, and the first bracket assembly is sleeved on the outer side of the first external tooth thread sleeve and meshed with the inner wall of the first nut and the first external tooth thread sleeve; The driving assembly comprises a transmission piece, the transmission piece is arranged to be movable along the first direction, the transmission piece and the moving piece move at the same speed, and the transmission piece is in meshed connection with the first nut. The planetary roller screw mechanism comprises a moving component, a nut component and a driving component, wherein the moving component of the moving component and a transmission component of the driving component move at the same speed, and the nut component is arranged to be of a matched structure of a first nut, a push rod and a first bracket component, so that the planetary roller screw mechanism can realize multidirectional control on the movement of components, and the problem of single use mode of the conventional planetary roller screw mechanism is solved. In addition, the planetary roller screw mechanism according to the present invention may further have the following additional technical features: In some embodiments of the present invention, the first bracket assembly includes two first planetary carriers and a plurality of first rollers, the two first planetary carriers are respectively disposed at two sides of the first rollers, the outer wall of the first rollers is provided with threads, and the threads are engaged with the inner wall of the first nut and the outer wall of the first external tooth thread bush. In some embodiments of the present invention, the nut assembly further includes a first pressing member detachably disposed at one end of the push rod, a first limiting member is disposed on the push rod, and the first bracket assembly is clamped between the first pressing member and the first limiting member. In some embodiments of the invention, the transmission is configured as a lead screw structure, and the drive assembly includes: A second nut extending in the first direction, the second nut is rotatably arranged; The second bracket component is sleeved at one end of the transmission piece, and is meshed with the inner part of the second nut and the outer wall of the transmission piece. In some embodiments of the invention, one end of the transmission member is provided with a second externally toothed threaded sleeve; The second support component comprises two second planet carriers and a plurality of second rollers, the two second planet carriers are respectively arranged on two sides of the second rollers, external threads are arranged on the outer walls of the second rollers, and the external threads are meshed with the inner wall of the transmission piece and the outer wall of the second external tooth thread sleeve. In some embodiments of the invention, the drive assembly further comprises a drive motor, the drive motor is c