Electric cylinder lead screw

Abstract

The utility model relates to the technical field of lead screws, in particular to an electric cylinder lead screw which comprises a lead screw body, a nut, a ball and a reverser, the lead screw body is of a song type double-arc structure, the ball holding point of the ball is raised, and the rigidity of the lead screw body is improved. The ball rolls between the lead screw and the nut when the lead screw rotates, the nut drives the nut to linearly move on the lead screw under rolling of the ball, rolling friction resistance between the ball and the nut is very small, movement is more stable, the reverser can be connected with the two ends of ball circulation, each circulation loop is closed circulation, and therefore the service life of the lead screw is prolonged. According to the ball screw nut, the ball does infinite circulation motion between the screw rod and the nut, the reverser is used for designing adjacent columns on the nut into channels capable of being circulated through curve adjustment, the number of circles of the ball which can be used in unit length is increased, the rigidity of the nut in unit length is greatly improved, and the characteristic of rigidity is exerted to the maximum extent by increasing the number of load circles.

Description

Technical Field

[0001] The utility model relates to the technical field of screws, in particular to an electric cylinder screw. Background Art

[0002] The core components of the electric cylinder are the motor and the screw transmission device. The motor converts electrical energy into mechanical energy to generate rotational motion, while the screw transmission device converts rotational motion into linear motion. This structure enables the electric cylinder to achieve high-precision and high-efficiency linear motion, so the screw is an important core component of the electric cylinder, and the ball screw is a commonly used transmission element. The ball screw consists of a screw, a nut, a ball and a reverser, which changes the sliding motion of the bearing into a rolling motion. It has very small friction resistance and has the characteristics of high precision, reversibility and high efficiency. However, the existing technology has defects. The original screw dynamic and static load is too small and the service life is too short; the original screw is not rigid enough, which makes the screw easy to deform; the original reverser design will leave a circle when it cooperates with the nut, resulting in insufficient rigidity per unit length of the nut; the original reverser can only be used on the matching nut, and the product production flexibility is not enough. Utility Model Content

[0003] The purpose of the utility model is to provide an electric cylinder screw to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: the electric cylinder screw includes a screw and a nut, the screw is installed through the middle of the nut, a reverser is installed on the inner wall of the nut, the inner and outer wall diameters of the nut and the reverser are the same, a plurality of balls arranged in sequence are installed between the screw and the nut, and the balls roll between the screw and the nut. When the electric cylinder is started, the screw is driven to rotate, the balls roll between the screw and the nut, and the nut is driven to move linearly on the screw, and the reverser can connect the two ends of the ball circulation, so that each circulation loop is a closed loop, allowing the balls to do infinite circulation between the screw and the nut.

[0005] The screw comprises a screw body, a ball groove is formed on the screw body, and the ball and the ball groove are fitted together. When the screw rotates, the ball is guided by the ball groove and starts to roll between the ball groove and the nut.

[0006] The nut includes a nut body, the inner wall of the nut body is provided with a spiral groove, the ball and the spiral groove are fitted together, the inner wall of the nut body is provided with a positioning groove, the reverser is installed in the positioning groove, and the ball rolls between the ball groove and the spiral groove. Due to the rolling of the ball, the rotation of the screw will be converted into relative linear motion between the ball and the nut. The rolling friction between the ball and the nut will offset a large part of the friction resistance, making the movement smoother and allowing the nut to move linearly on the screw.

[0007] The deflector includes a deflector body, which is installed in the positioning groove. The inner wall of the deflector body is provided with a guide groove, and the ball and the guide groove fit each other. When the ball reaches the end of the track of the spiral groove, the ball leaves the track of the spiral groove and enters the track of the guide groove. When the lead screw rotates, the ball enters the track of the spiral groove from the track of the guide groove again, completing the rolling cycle.

[0008] The two end openings of the spiral groove and the guide groove cooperate with each other. The balls can circulate and roll in the spiral groove and the guide groove.

[0009] Circulating channels are arranged on adjacent rows of the spiral grooves, which increases the number of ball turns that can be used per unit length and greatly improves the rigidity of the nut per unit length.

[0010] The ball groove is a Gothic double arc structure, which raises the ball holding point and improves the rigidity of the lead screw.

[0011] Compared with the prior art, the beneficial effects achieved by the utility model are:

[0012] The utility model uses non-standard enlarged balls and a machined customized deflector design. On the basis of the original screw parameters, the enlarged balls and compact deflector design greatly improve the dynamic and static loads of the screw, extend the service life of the screw, and meet the requirements for the use of electric cylinder screws. The screw of the utility model adopts a Gothic double arc structure to raise the ball holding point of the ball to improve the rigidity of the screw. The deflector of the utility model adjusts the curve to design adjacent columns on the nut into circulated channels, thereby increasing the number of ball circles that can be used per unit length, greatly improving the rigidity of the nut per unit length, and by increasing the number of load circles, the rigidity characteristics are maximized. The design method of the deflector of the utility model is relatively flexible, and mechanical processing is adopted, and various non-standard parts can be designed and processed, thereby improving the flexibility of product production. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a three-dimensional diagram of the electric cylinder screw of the utility model;

[0015] Figure 2 It is an internal schematic diagram of the electric cylinder screw of the utility model;

[0016] Figure 3 It is a three-dimensional diagram of the lead screw of the utility model;

[0017] Figure 4 It is a three-dimensional diagram of the nut of the utility model;

[0018] Figure 5 It is a three-dimensional diagram of the reverser of the utility model;

[0019] Figure 6 It is a schematic diagram of the cooperation between the ball and the Gothic groove of the utility model;

[0020] In the figure: 1, screw; 11, screw body; 12, ball groove; 2, nut; 21, nut body; 22, spiral groove; 23, positioning groove; 3, reverser; 31, reverser body; 32, guide groove. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] See also Figure 1-Figure 5 The utility model provides a technical solution: the electric cylinder screw comprises a screw 1 and a nut 2. The screw 1 is installed through the middle of the nut 2. A reverser 3 is installed on the inner wall of the nut 2. The inner and outer wall diameters of the nut 2 and the reverser 3 are the same. A plurality of balls arranged in sequence are installed between the screw 1 and the nut 2, and the balls roll between the screw 1 and the nut 2. When the screw is started, the screw 1 is driven to rotate, and the balls roll between the screw 1 and the nut 2, driving the nut 2 to move linearly on the screw 1. The reverser 3 can connect the two ends of the ball circulation, so that each circulation loop is a closed loop, allowing the balls to make infinite circulation between the screw 1 and the nut 2.

[0023] The screw 1 includes a screw body 11, on which a ball groove 12 is provided. The ball groove 12 is a Gothic double arc structure. The ball holding point is raised, the rigidity of the screw 1 is improved, and the ball fits the ball groove 12. When the screw 1 rotates, the ball is guided by the ball groove 12 and starts to roll between the ball groove 12 and the nut 2.

[0024] The nut 2 includes a nut body 21, the inner wall of the nut body 21 is provided with a spiral groove 22, the ball and the spiral groove 22 are fitted together, the two end openings of the spiral groove 22 and the guide groove 32 cooperate with each other, the ball can circulate and roll in the spiral groove 22 and the guide groove 32, and a circulating channel is provided on the adjacent rows of the spiral groove 22. The number of ball turns that can be used per unit length is increased, and the rigidity of the nut 2 per unit length is greatly improved. A positioning groove 23 is provided on the inner wall of the nut body 21, and the reverser 3 is installed in the positioning groove 23, and the ball rolls between the ball groove 12 and the spiral groove 22. Due to the rolling of the ball, the rotation of the screw 1 will be converted into a relative linear motion of the ball and the nut 2. The rolling friction between the ball and the nut 2 will offset a large part of the friction resistance, making the movement smoother and allowing the nut 2 to move linearly on the screw 1.

[0025] The reverser 3 includes a reverser body 31, which is installed in the positioning groove 23. A guide groove 32 is provided on the inner wall of the reverser body 31, and the ball is fitted with the guide groove 32. When the ball reaches the end of the track of the spiral groove 22, the ball leaves the track of the spiral groove 22 and enters the track of the guide groove 32. When the lead screw 1 rotates, the ball enters the track of the spiral groove 22 from the track of the guide groove 32 again, completing the rolling cycle.

[0026] The working principle of this utility model:

[0027] When the electric cylinder is started, it drives the screw 1 to rotate, and the ball is guided by the ball groove 12 and begins to roll between the ball groove 12 and the spiral groove 22 of the nut 2. Due to the rolling of the ball, the rotation of the screw 1 will be converted into relative linear motion between the ball and the nut 2. The rolling friction between the ball and the nut 2 will offset most of the friction resistance, making the movement smoother and allowing the nut 2 to move linearly on the screw 1. When the ball reaches the end of the track of the spiral groove 22, the ball leaves the track of the spiral groove 22 and enters the track of the guide groove 32 of the reverser 3, moves along the track of the guide groove 32 back to the track of the same spiral groove 22, and rolls cyclically between the spiral groove 22 and the guide groove 32 to ensure that the nut 2 can make linear motion on the screw 1.

[0028] When the electric cylinder stops rotating, the lead screw 1 stops rotating, and the ball is in the track of the spiral groove 22 and the guide groove 32. At this time, there is no relative motion between the lead screw 1 and the nut 2, and linear motion is impossible. At this time, the nut 2 stops on the lead screw 1.

[0029] Although the embodiments of the present invention have been shown and described, it is understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. An electric cylinder screw, characterized in that: The electric cylinder screw comprises a screw (1) and a nut (2). The screw (1) is installed through the middle of the nut (2). A deflector (3) is installed on the inner wall of the nut (2). The inner and outer wall diameters of the nut (2) and the deflector (3) are the same. A plurality of balls arranged in sequence are installed between the screw (1) and the nut (2). The balls roll between the screw (1) and the nut (2).

2. The electric cylinder screw according to claim 1, characterized in that: The screw (1) comprises a screw body (11), a ball groove (12) is provided on the screw body (11), and the ball and the ball groove (12) are in contact with each other.

3. The electric cylinder screw according to claim 2, characterized in that: The nut (2) comprises a nut body (21), the inner wall of the nut body (21) is provided with a spiral groove (22), the ball bearing and the spiral groove (22) are in contact with each other, the inner wall of the nut body (21) is provided with a positioning groove (23), the deflector (3) is installed in the positioning groove (23), and the ball bearing rolls between the ball bearing groove (12) and the spiral groove (22).

4. The electric cylinder screw according to claim 3, characterized in that: The deflector (3) comprises a deflector body (31), the deflector body (31) is installed in the positioning groove (23), a guide groove (32) is provided on the inner wall of the deflector body (31), and the ball bearing and the guide groove (32) are in contact with each other.

5. The electric cylinder screw according to claim 4, characterized in that: The openings at both ends of the spiral groove (22) and the guide groove (32) cooperate with each other.

6. The electric cylinder screw according to claim 5, characterized in that: Adjacent rows of the spiral grooves (22) are provided with circulating channels.

7. The electric cylinder screw according to claim 6, characterized in that: The ball groove (12) is a Gothic double arc structure.

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