CN-122014712-A - Hydraulic planetary roller screw spiral swing cylinder and hydraulic system

CN122014712ACN 122014712 ACN122014712 ACN 122014712ACN-122014712-A

Abstract

The invention belongs to the technical field related to hydraulic swing actuators, and discloses a hydraulic planetary roller screw spiral swing cylinder and a hydraulic system, wherein the swing cylinder comprises a cylinder body, a piston part and a transmission shaft part, the piston part is movably arranged in the cylinder body, one end of the transmission shaft part penetrates through the piston part, and the piston part and the transmission shaft part form threaded connection; the piston component comprises a thread shell and a plurality of rollers which are uniformly distributed around the central axis of the thread shell and are arranged in the thread shell, wherein threaded connection is formed between the rollers and the thread shell, the transmission shaft component is arranged among the rollers, threaded connection is formed between the transmission shaft component and the rollers, and the rollers can rotate and revolve around the central axis of the thread shell under the drive of the thread shell. The invention realizes the coexistence of high efficiency and heavy load.

Inventors

LIU YINSHUI
WANG YAZHOU
LIU XUAN
ZHANG LIE
WANG ZHENYAO
DENG YIPAN

Assignees

华中科技大学

Dates

Publication Date: 20260512
Application Date: 20260324

Claims (10)

1. A hydraulic planetary roller screw spiral swing cylinder is characterized in that: The swing cylinder comprises a cylinder body, a piston component and a transmission shaft component, wherein the piston component is movably arranged in the cylinder body, one end of the transmission shaft component penetrates through the piston component, and threaded connection is formed between the piston component and the transmission shaft component; The piston component comprises a thread shell and a plurality of rollers which are uniformly distributed around the central axis of the thread shell and are arranged in the thread shell, wherein threaded connection is formed between the rollers and the thread shell, the transmission shaft component is arranged among the rollers, threaded connection is formed between the transmission shaft component and the rollers, and the rollers can rotate and revolve around the central axis of the thread shell under the drive of the thread shell.
2. The hydraulic planetary roller screw spiral swing cylinder of claim 1, wherein the piston component further comprises a piston end cover, two retainers and two hole snap springs, the piston end cover is connected to the large end of the threaded shell in a threaded mode, a plurality of rollers, the two retainers, the two hole snap springs and the two inner gear rings are all arranged in the threaded shell, movable connection is formed between the threaded shell and the cylinder body, the two retainers are arranged at intervals, the two hole snap springs are also arranged at intervals, the two inner gear rings are also arranged at intervals, the retainers are located between the hole snap springs and the inner gear rings, two ends of the rollers are connected to the two retainers respectively, threaded connection is formed between the rollers and the inner gear rings, and threaded connection is also formed between the rollers and the threaded shell.
3. The hydraulic planetary roller screw spiral swing cylinder as claimed in claim 2, wherein external splines are uniformly arranged on the periphery of the threaded shell, and the external splines are matched with the internal splines of the cylinder body, so that movable connection is formed between the piston component and the cylinder body.
4. The hydraulic planetary roller screw spiral swing cylinder of claim 2, wherein a first stepped groove and a second groove are respectively formed in two opposite ends of the threaded shell, a first groove is formed in the bottom surface of the first stepped groove, a first internal threaded hole is formed in the bottom surface of the first groove, a third groove is formed in the bottom surface of the second groove, the third groove is communicated with the first internal threaded hole, a fourth annular groove is formed in one end, adjacent to the first groove, of the first stepped groove, a fifth annular groove is formed in one end, adjacent to the third groove, of the second groove, two hole clamp springs are respectively arranged in the fourth annular groove and the fifth annular groove, two inner gear rings are respectively arranged in the first groove and the third groove, one retainer is located between one hole clamp spring and the bottom surface of the first stepped groove, and the other retainer is located between the other hole clamp spring and the bottom surface of the second groove.
5. The hydraulic planetary roller screw spiral swing cylinder as claimed in claim 4, wherein the piston end cover is provided with a third through hole, and a sealing ring and a first sealing are arranged on the inner wall of the third through hole at intervals.
6. The hydraulic planetary roller screw spiral swing cylinder as claimed in claim 4, wherein the roller comprises a cylinder, roller threads are formed in the middle of the cylinder, roller left gears and roller right gears are arranged at two ends of the cylinder, the roller left gears and the roller right gears are respectively arranged adjacent to two opposite ends of the roller threads, the opposite ends of the cylinder are respectively connected to two retainers, threaded connection is formed between the roller threads and the first internal threaded holes, the roller left gears and the roller right gears are respectively arranged in the two annular gears, and threaded connection is formed between the roller left gears and the roller right gears respectively.
7. The hydraulic planetary roller screw helical oscillating cylinder of claim 6, wherein the pitch diameter of said roller screw thread, the pitch diameter of said roller left gear and the pitch diameter of said roller right gear are equal, and wherein said roller left gear and said roller right gear are also in threaded engagement with the drive shaft external threads of said drive shaft member.
8. The hydraulic planetary roller screw spiral swing cylinder as claimed in any one of claims 1-7, wherein the swing cylinder further comprises a left end cover part, a sealing block part and a right end cover part, the left end cover part and the right end cover part are respectively connected to two opposite ends of the cylinder body, the sealing block part is arranged in the cylinder body and adjacent to the right end cover part, and one end of the transmission shaft part sequentially penetrates through the right end cover part, the sealing block part and the piston part and then stretches into the left end cover part.
9. The hydraulic planetary roller screw spiral swing cylinder as claimed in claim 8, wherein an integrated mounting flange is uniformly arranged on the periphery of one end, adjacent to the right end cover part, of the cylinder body, the cylinder body is connected to an output target through the mounting flange, a main connecting hole extending along the axial direction of the cylinder body is formed in the mounting flange, the main connecting hole is matched with a connecting screw to be connected with the output target, an auxiliary threaded hole is formed in the mounting flange, and the central axis of the auxiliary threaded hole is perpendicular to the central axis of the main connecting hole.
10. A hydraulic system is characterized in that an actuator of the hydraulic system adopts the hydraulic planetary roller screw spiral swing cylinder as claimed in any one of claims 1 to 9.

Description

Hydraulic planetary roller screw spiral swing cylinder and hydraulic system Technical Field The invention belongs to the technical field of hydraulic swing actuators, and particularly relates to a hydraulic planetary roller screw spiral swing cylinder and a hydraulic system. Background The hydraulic swing actuator is a fluid power device which is specially used for converting hydraulic energy into limited angle reciprocating rotary motion, and has the core functions of outputting high torque, high rigidity and quick response mechanical action in a specific angular displacement range. More specifically, the hydraulic swing actuator converts hydraulic energy into a partial rotational motion. The hydraulic spiral oscillating cylinder is a device which converts the linear motion of a piston into the rotary oscillation of an output shaft by hydraulic energy. More specifically, the core working principle of the device is that the linear motion of the piston is converted into the swing of the output shaft by utilizing the optimized large-helix angle screw pair, and compared with the forms of a gear rack, a blade and the like, the device has the advantages of compact structure, large torque output, accurate swing angle, good running stability and the like. The hydraulic spiral swinging cylinder has wide application field, is mainly used for heavy engineering machinery, mining metallurgical machinery, deep sea operation robots, aerospace, special vehicles and other rotating parts needing to drive large torque, and is widely applied to occasions needing large torque, small space and high reliability. Further, along with the evolution of torque output equipment in the fields of heavy engineering machinery, special vehicles and the like, the torque output equipment evolves to the directions of large output torque, strong adaptability and energy conservation, so that the hydraulic spiral swing actuator is required to meet the requirements of large output torque, small volume, high efficiency and the like in order to meet the operation requirements of engineering machinery, special vehicles and the like. However, the existing hydraulic screw-oscillating cylinders have the following bottlenecks: the efficiency and the heavy load capacity are difficult to be considered, the existing spiral swing cylinder mainly adopts a sliding spiral pair as a core transmission structure, the transmission efficiency of the spiral pair is low due to the structural characteristics of the spiral pair, and the spiral pair can be replaced by a ball screw pair, but the point of contact between a ball and a roller path in the ball screw pair is limited by the curvature of the contact position, and the ball screw pair is difficult to finish the heavy load task. The possible scheme for improving the efficiency is that more specifically, the sliding screw pair is replaced by the ball screw pair, the rolling friction between the balls and the rollaway nest is used for replacing the sliding friction of the internal thread and the external thread in the sliding screw pair, the mechanical efficiency can be improved, but the bearing capacity of the ball screw pair is far lower than that of the sliding screw pair under the same size and the same material condition, so that the heavy load performance of the spiral swinging cylinder is greatly reduced, and the use requirement of a heavy load scene cannot be met. Disclosure of Invention Aiming at the defects or improvement demands of the prior art, the invention provides a hydraulic planetary roller screw spiral swing cylinder and a hydraulic system, which aim to solve the problem that heavy load and high efficiency are difficult to coexist in the existing hydraulic swing cylinder. In order to achieve the above object, according to one aspect of the present invention, there is provided a hydraulic planetary roller screw spiral swing cylinder, the swing cylinder including a cylinder body, a piston member and a transmission shaft member, the piston member being movably disposed in the cylinder body, one end of the transmission shaft member passing through the piston member and forming a threaded connection therebetween; The piston component comprises a thread shell and a plurality of rollers which are uniformly distributed around the central axis of the thread shell and are arranged in the thread shell, wherein threaded connection is formed between the rollers and the thread shell, the transmission shaft component is arranged among the rollers, threaded connection is formed between the transmission shaft component and the rollers, and the rollers can rotate and revolve around the central axis of the thread shell under the drive of the thread shell. The piston component further comprises a piston end cover, two retainers and two hole snap springs, wherein the piston end cover is in threaded connection with the large end of the threaded shell, a plurality of rollers, the two retainers and the two hole snap spri