A ball screw pair with double-layer thread raceway
Through the design of the ball screw pair with double-layer threaded raceway, the inner and outer ball screw pairs work simultaneously, solving the problems of insufficient load, difficult processing and high production costs in heavy-load applications, and achieving more Small size, larger axial thrust and lower production costs.
Patent Information
- Application Number
- CN202210159488.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-02-22
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2042-02-22
AI Technical Summary
For products with high load requirements, existing ball screw pairs are difficult to process, high production costs and too large in size, which cannot meet the needs of heavy-load applications.
The ball screw pair is designed with a double-layer threaded raceway, in which the inner and outer ball screw pairs work simultaneously. Through the cooperation of the steel ball and the returner, the axial thrust increases and space savings are achieved.
Compared with the single-layer ball screw pair, the double-layer design doubles the axial thrust, smaller appearance size, reduced processing difficulty and low production cost, and is suitable for heavy-duty application sites.
Smart Images
Figure CN114483902B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to a ball screw pair structure, and in particular relates to a ball screw pair with a double-layer threaded raceway. Background Art
[0002] At present, the commonly used ball screw pairs are all processed with external thread raceways on the outer diameter of the ball screw and internal thread raceways on the inner hole of the ball nut. A steel ball is installed between the two. The steel ball rolls back and forth through the return device installed on the nut, thereby converting the rotational motion of the screw into the linear motion of the nut. However, for some products with large load requirements, the ball screw needs to be made very large to meet the requirements, which results in problems such as high processing difficulty, high production cost, and excessive size. Summary of the invention
[0003] The purpose of the present invention is to provide a ball screw pair with a double-layer threaded raceway, which effectively solves the problem of insufficient load of the existing ball screw pair.
[0004] The technical solution of the present invention is a ball screw pair with a double-layer threaded raceway, including a ball screw and nut assembly, a sleeve ball nut, and a steel ball. The characteristic of the ball screw is that a ball screw threaded raceway is processed on the outer diameter of the ball screw and nut assembly, a steel ball is installed between the sleeve ball nut raceway, a screw return device is provided on the ball screw threaded raceway, and the steel ball reciprocates through the screw return device to form an outer ball screw pair; a ball nut threaded raceway is processed on the inner diameter of the ball screw and nut assembly, a steel ball is installed between the inner ball screw raceway, a nut return device is provided on the ball nut threaded raceway, and the steel ball reciprocates through the nut return device to form an inner ball screw pair; the inner ball screw and the sleeve ball nut are fixed together by screws, and when the inner ball screw and the sleeve ball nut rotate at the same time, the inner and outer ball screw pairs work at the same time, so that the sleeve ball nut produces linear motion.
[0005] The present invention has the following beneficial effects:
[0006] The invention adopts a double-layer ball screw pair working simultaneously, so the axial thrust is increased by two times compared with the conventional single-layer ball screw pair, the outer dimensions can be made smaller, space is saved, the processing difficulty is small, the production cost is low, and it is suitable for heavy-load ball screw pair application places. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 It is a structural diagram of the double-layer ball screw pair of the present invention.
[0008] Figure 2 It is an exploded view of the double-layer ball screw pair of the present invention.
[0009] Figure 3It is a schematic diagram of the nut bead return device of the present invention.
[0010] Figure 4 It is a schematic diagram of the lead screw ball return device of the present invention.
[0011] Explanation of the reference numerals: 1-inner ball screw; 2-ball screw and nut assembly; 3-sleeve ball nut; 4-nut return device; 5-screw return device; 6-steel ball; 7-fastening screw. DETAILED DESCRIPTION
[0012] like Figure 1 As shown, the present embodiment discloses a ball screw pair with a double-layer threaded raceway, comprising an inner ball screw 1, a ball screw and nut assembly 2, and a sleeve ball nut 3; the ball screw and nut assembly 2 combines the ball screw and the ball nut together, and a ball screw threaded raceway is processed on its outer diameter, a steel ball 6 is installed between the inner threaded raceway of the sleeve ball nut 3, a screw return device 5 is provided on the ball screw threaded raceway, and the steel ball 6 reciprocates through the screw return device 5, thereby forming an outer ball screw pair; similarly, a ball nut threaded raceway is processed on the inner diameter of the ball screw and nut assembly 2, a steel ball 6 is installed between the inner threaded raceway of the inner ball screw 1, a nut return device 4 is provided on the ball nut raceway, and the steel ball reciprocates through the nut return device 4, thereby forming an inner ball screw pair; the inner ball screw 1 and the sleeve ball nut 3 are fixed together by fastening screws 7.
[0013] During operation, the inner ball screw 1 is driven to rotate. Since the sleeve ball nut 3 is fixed to the inner ball screw 1 by the fastening screw 7, the sleeve ball nut 3 and the inner ball screw 1 rotate simultaneously, and at the same time push the ball screw and nut assembly 2 to move, so that the inner and outer ball screw pairs work simultaneously.
[0014] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the field within the technical scope disclosed in the present invention should be covered by the protection scope of the present invention.
Claims
1. A double-layer threaded raceway ball screw pair, comprising a ball screw and nut assembly (2), a sleeve ball nut (3), and a steel ball (6), wherein: A ball screw thread raceway is machined on the outer diameter of the ball screw and nut assembly (2), and a steel ball (6) is installed between the sleeve ball nut raceway. A screw return device (5) is provided on the ball screw thread raceway, and the steel ball (6) reciprocates through the screw return device (5), thereby forming an outer ball screw pair; a ball nut thread raceway is also machined on the inner diameter of the ball screw and nut assembly (2), and a steel ball (6) is installed between the sleeve ball screw raceway and the inner ball screw raceway. A nut returner (4) is provided on the upper part, and the steel ball (6) reciprocates through the nut returner (4), thereby forming an inner ball screw pair; when working, the inner ball screw (1) is driven to rotate, and since the sleeve ball nut (3) is fixed to the inner ball screw (1) by a fastening screw (7), the sleeve ball nut (3) and the inner ball screw (1) rotate simultaneously, and at the same time push the ball screw and nut assembly (2) to move, so that the inner and outer ball screw pairs can work simultaneously.
Citation Information
Patent Citations
Ballistic tolerant dual load path ballscrew and ballscrew actuator
US4679485A
Multi-stage ball screw unit and electric actuator using same
WO2021210406A1