Low-resistance ball screw

Abstract

The utility model discloses a low-resistance ball screw. The low-resistance ball screw comprises a screw body, an installation assembly and an operation assembly. The operation assembly comprises an inner side cylinder, and an outer side cylinder is arranged on the outer side of the inner side cylinder Limiting baffles are arranged on the outer sides of the two ends of the inner side cylinder, circular grooves are formed in the upper, lower, left and right surfaces of the inner side cylinder, balls are rotationally arranged in the circular grooves, and the lower ends of the balls are in rolling connection with the rod body; each ball is formed by welding two hemispheres, and each hemisphere is provided with a plurality of hollow grooves; a lubricating structure is arranged in the operation assembly. According to the utility model, the balls are separated and are limited independently instead of being arranged tightly, so that mutual friction among the balls is avoided; the weight of the balls is reduced, so that friction force and resistance are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of screw rods, in particular to a low-resistance ball screw rod. Background Art

[0002] Ball screws are the most commonly used transmission components in tool machinery and precision machinery. Their main function is to convert rotational motion into linear motion, or torque into axial repetitive force. Due to their small friction resistance, ball screws are widely used in various industrial equipment and precision instruments. Commonly used circulation methods include external circulation and internal circulation.

[0003] Compared with ordinary sliding screws, ball screws have the advantages of high transmission efficiency, high sensitivity, high positioning accuracy and long service life. By reducing the contact area through the ball, friction can be reduced and flexibility can be improved.

[0004] The ball screw realizes transmission through the rotational contact between multiple arranged balls, nuts and screw rods. However, in the prior art, since the balls are mostly made of steel balls, they have a certain weight. Friction will be generated during the rolling contact with each other, which increases the resistance of the screw rod and nut during operation. Under long-term operation, this resistance will cause wear of various components of the ball nut, so there is room for improvement. Utility Model Content

[0005] The utility model aims to solve the technical problem in the prior art that rolling contact during ball operation will generate friction and increase the resistance of the screw nut during operation, and provides a low-resistance ball screw.

[0006] In order to solve the above technical problems, the technical solution provided by the utility model is as follows: a low-resistance ball screw, comprising a rod body, a mounting assembly and a running assembly; the mounting assembly comprises two symmetrically arranged mounting plates, the front sides of the mounting plates are connected with semicircular reinforcement members, the mounting plates are provided with a plurality of assembly holes, the opposite sides of the mounting plates and near the upper and lower ends are provided with connecting members, and the corresponding connecting members are connected by bolts; the running assembly comprises an inner cylinder, an outer cylinder is provided on the outer side of the inner cylinder, the outer cylinder is composed of two hollow semi-cylinders, and the two hollow semi-cylinders are respectively fixedly connected to the corresponding mounting plates; limit baffles are provided on the outer sides of both ends of the inner cylinder, and circular grooves are arranged on the four sides of the inner cylinder, and balls are rotatably arranged in the circular grooves, and the lower ends of the balls are rollingly connected to the rod body; the balls are welded by two hemispheres, and each hemisphere is provided with a plurality of hollow grooves; a lubrication structure is provided in the running assembly.

[0007] Preferably, a plurality of through grooves are provided on the outer side of the rod body along the circumference, and the through grooves are evenly arranged along the length direction of the rod body.

[0008] Preferably, the inner tube is a hollow cylinder, and the limit baffles are all in a circular shape.

[0009] Preferably, the inner side surfaces of the circular grooves are all concave surfaces, and the curvature of the concave surfaces matches that of the balls and is larger than the outer diameter of the balls.

[0010] Preferably, a sealing gasket is provided inside the reinforcement member.

[0011] Preferably, the lubrication structure comprises a cavity inside the outer tube, one end of the outer tube is provided with an oil inlet capable of communicating with the cavity; the inner side surface of the outer tube is arranged with a plurality of oil drip ports communicating with the cavity, and the oil drip ports correspond to one of the rows of circular grooves.

[0012] The advantages of the utility model compared with the prior art are:

[0013] 1. Reduce the weight of the ball itself, open a hollow groove in the ball, reduce the weight without affecting the surface smoothness and rotation efficiency of the ball, thereby reducing friction and resistance;

[0014] 2. The balls are not arranged closely, but are separated and limited individually to avoid mutual friction between the balls. The balls are arranged symmetrically to avoid reducing the overall structural strength of the ball screw when the number is reduced. In addition, the position of the balls is limited by the circular groove, with only one end rolling in contact with the screw rod body, and the other end extending out of the circular groove without contacting the object, further reducing the resistance;

[0015] 3. A lubrication structure is provided to lubricate the ball and screw during operation, which also serves the purpose of reducing friction and operating resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model.

[0018] Figure 3 It is a schematic diagram of the structure of the inner tube and the outer tube of the utility model.

[0019] Figure 4 It is a schematic cross-sectional view of the inner tube of the utility model.

[0020] Figure 5 It is a schematic cross-sectional view of the outer tube of the utility model.

[0021] Figure 6 It is a schematic diagram of a ball structure of one quarter of the utility model.

[0022] As shown in the figure: 1. Rod body, 2. Mounting plate, 3. Reinforcement, 4. Assembly hole, 5. Connector, 6. Through groove, 7. Inner cylinder, 8. Outer cylinder, 9. Limit baffle, 10. Round groove, 11. Ball, 12. Hollow groove, 13. Sealing gasket, 14. Cavity, 15. Oil inlet, 16. Oil drip port. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0024] Embodiment 1, in combination with the attached Figure 1 A low-resistance ball screw comprises a rod body 1, a mounting assembly and a running assembly; a plurality of through grooves 6 are arranged around the outer side of the rod body 1, and the through grooves 6 are evenly arranged along the length direction of the rod body 1. The arrangement of the through grooves 6 can not only save material costs, but also reduce the contact area with the ball 11 and reduce resistance.

[0025] Combined with Figure 1 The mounting assembly includes two symmetrical mounting plates 2, the front sides of the mounting plates 2 are connected with semicircular reinforcement members 3, the inner sides of the reinforcement members 3 are provided with sealing gaskets 13, the mounting plates 2 are provided with a plurality of assembly holes 4, the opposite sides of the mounting plates 2 and near the upper and lower ends are provided with connecting members 5, and the corresponding connecting members 5 are connected by bolts; through the detachable mounting plates 2 and reinforcement members 3, the outer tube 8 mentioned later can be disassembled, so as to check the inner lubrication condition and repair the ball 11, etc.

[0026] Combined with Figure 3 , 4 5. The running assembly includes an inner tube 7, which is a hollow cylinder. An outer tube 8 is arranged outside the inner tube 7. The outer tube 8 is composed of two hollow semi-cylinders. The two hollow semi-cylinders are respectively fixedly connected to the corresponding mounting plates 2, so that the outer tube 8 can be disassembled, which is convenient for checking the inner lubrication condition and repairing the ball 11, etc.; limit baffles 9 are arranged on the outer sides of both ends of the inner tube 7. The limit baffles 9 are all annular, and the diameter of the limit baffles 9 is larger than that of the inner tube 7, so a space is formed between the outer side of the inner tube 7 and the outer tube 8. A space, this space makes the upper end of the ball 11 do not need to contact the object, reducing friction and further reducing resistance; circular grooves 10 are arranged on the four sides of the inner tube 7, and balls 11 are rotatably arranged in the circular grooves 10, and the lower ends of the balls 11 are rollingly connected with the rod body 1; the inner side surfaces of the circular grooves 10 are all concave, and the curvature of the concave surface is consistent with the ball 11 and is larger than the outer diameter of the ball 11, so that the ball 11 can not only rotate in the circular groove 10, but also be restricted by the circular groove 10 with an arc-shaped side, and cannot escape, but can only rotate.

[0027] Combined with Figure 6The ball 11 is welded from two hemispheres, each of which is provided with a plurality of hollow grooves 12. The hollow grooves 12 reduce the deadweight of the ball 11, thereby reducing the friction between the ball 11 and the rod body 1 when the ball 11 rotates.

[0028] Embodiment 2, combined with the attached Figure 2 , 5 A lubrication structure is provided in the running component, and the lubrication structure includes a cavity 14 provided inside the outer tube 8, and an oil inlet 15 which can be connected with the cavity 14 is provided at one end of the outer tube 8; a plurality of oil dripping ports 16 which are connected with the cavity 14 are arranged on the inner side surface of the outer tube 8, and the oil dripping ports 16 correspond to one row of circular grooves 10. Oil is filled into the cavity 14 through the oil inlet 15, and drips onto the ball 11 through the plurality of oil dripping ports 16. With the rolling transmission of the ball 11 and the rod body 1, the lubricating oil is transmitted to the remaining balls 11.

[0029] The working principle of the utility model is as follows: when in use, it is connected with the corresponding equipment or components through the mounting plate 2. During operation, the ball 11 rotates on the surface of the screw rod body 1, driving the outer screw nut, that is, the inner tube 7 to move back and forth. During rotation, the ball 11 is restricted in the circular groove 10 and can only rotate but cannot move, thereby avoiding mutual contact between the balls 11 and reducing frictional resistance. In addition, the upper end of the ball 11 is exposed from the circular groove 10 and does not contact other objects, further reducing operating resistance. In addition, the ball 11 reduces its own weight by opening a hollow groove 12, which can reduce friction and reduce resistance.

[0030] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A low-resistance ball screw, comprising a rod body (1), a mounting assembly and a running assembly; characterized in that: The mounting assembly comprises two symmetrically arranged mounting plates (2), the front sides of the mounting plates (2) are connected with semicircular reinforcement members (3), the mounting plates (2) are provided with a plurality of assembly holes (4), the opposite sides of the mounting plates (2) and close to the upper and lower ends are provided with connecting members (5), and the corresponding connecting members (5) are connected by bolts; the running assembly comprises an inner tube (7), the outer side of the inner tube (7) is provided with an outer tube (8), and the outer tube (8) is composed of two hollow semi-cylinders. Two hollow semi-cylinders are respectively fixedly connected to corresponding mounting plates (2); both ends of the inner tube (7) are provided with limit baffles (9) on their outer sides; the inner tube (7) is provided with circular grooves (10) on its upper, lower, left and right sides; balls (11) are rotatably arranged in the circular grooves (10); the lower ends of the balls (11) are rollingly connected to the rod body (1); the balls (11) are welded from two hemispheres, each of which is provided with a plurality of hollow grooves (12); and a lubrication structure is provided in the operating component.

2. A low-resistance ball screw according to claim 1, characterized in that: A plurality of through grooves (6) are arranged along the circumference of the outer side of the rod body (1), and the through grooves (6) are evenly arranged along the length direction of the rod body (1).

3. A low resistance ball screw according to claim 1, characterized in that: The inner tube (7) is a hollow cylinder, and the limit baffles (9) are all in the shape of a ring.

4. The low-resistance ball screw according to claim 1, characterized in that: The inner side surfaces of the circular grooves (10) are all concave surfaces, and the curvature of the concave surfaces matches that of the balls (11) and is larger than the outer diameter of the balls (11).

5. The low-resistance ball screw according to claim 1, characterized in that: A sealing gasket (13) is provided inside the reinforcement member (3).

6. The low-resistance ball screw according to claim 1, characterized in that: The lubrication structure comprises a cavity (14) provided inside an outer tube (8); an oil inlet (15) capable of communicating with the cavity (14) is provided at one end of the outer tube (8); and a plurality of oil dripping ports (16) communicating with the cavity (14) are arranged on the inner side surface of the outer tube (8); the oil dripping ports (16) correspond to one row of the circular grooves (10).

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