Ball screw with reversing device

Abstract

The invention discloses a transmission mechanism, and aims to provide a ball screw with a reversing device, which is convenient to reverse and good in lubricating effect, and is characterized in that a ball rolls in a thread groove formed in the screw and is used for reducing friction between the screw and a nut in the rotating process; the ball circulates in the lead screw through the reversing device on the lead screw, the surface of the connecting part of the opening of the reverser and the bottom of the threaded groove is smooth, the ball enters the reverser smoothly, the lead screw operates stably, meanwhile, the ball is prevented from being damaged due to collision between the ball and the opening, the reversing assembly is detachably connected with the lead screw, installation is convenient, and the structure is compact. The ball screw machining method is suitable for the technical field of ball screws.

Description

Technical Field

[0001] The present invention relates to a transmission mechanism, and more particularly to a ball screw with a reversing device. Background Art

[0002] A ball screw generally includes a screw shaft, a nut, and a number of balls arranged between the screw shaft and the nut. The outer circumference of the screw shaft and the inner circumference of the nut are matched with each other to form a rolling groove for the balls to roll. Through the rolling of the balls, the ball screw can convert rotational motion into linear motion, or convert linear motion into rotational motion.

[0003] Since the balls in the ball screw move in a single direction and are prone to lose their function during the movement of the ball screw, a device for circulating the balls needs to be provided on the ball screw so that when the screw shaft rotates relative to the nut, the balls sandwiched between the screw shaft and the nut roll between them. The balls that roll to one end of the load ball rolling groove of the nut enter the return path, and after passing through the return path, return to the other end of the load ball rolling groove of the nut. Then, they roll to one end of the load ball rolling groove again.

[0004] At present, the ball screws with circulation devices on the market can circulate the balls, but the circulation devices set on the screws will form large protrusions, which are difficult to process. In addition, the friction between the inner wall of the circulation device and the balls is large, making the balls difficult to move and easy to wear, which greatly reduces the service life of the screws. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a ball screw with a reversing device which is easy to reversing and has a good lubrication effect.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a ball screw with a reversing device, comprising a screw and a transmission member arranged at the lower end of the screw, the screw being provided with a threaded groove for placing balls, the threaded groove being configured as a path for the balls to roll, the screw being able to perform relative motion on the shaft through the rolling of the balls, a plurality of commutators being provided on the threaded groove, the commutator being a part located outside the screw being a reversing assembly, the reversing assembly being configured to guide the balls in the screw back, and the reversing assembly comprising a mounting body, openings arranged on both sides of the mounting body, and A ball channel is arranged inside the mounting body, and the openings on both sides are connected to each other through the ball channel, and the openings on both sides of the commutator are respectively arranged in two adjacent threaded grooves, and the trajectory of the ball channel in the mounting body is set as a straight line, the opening diameter in the commutator is equal to the width of the threaded groove of the screw, and the surface of the connecting part between the bottom of the opening of the commutator and the bottom of the threaded groove of the screw is smooth, the part of the mounting body extending from the inner side of the screw at the rear end is set as a plug-in part, and the screw is also provided with a plug-in groove matching the plug-in part, and the commutator and the screw are detachably connected by inserting the plug-in part into the plug-in groove.

[0007] By adopting the above technical solution, the ball rolls in the threaded groove provided on the screw, which is used to reduce the friction between the screw and the nut during rotation, and the ball circulates in the screw through the reversing device on the screw. The surface of the connecting part between the opening of the commutator and the bottom of the threaded groove is smooth, and the ball enters the commutator smoothly, so that the screw operates smoothly. At the same time, it prevents the ball from colliding with the opening and causing damage to the ball. The reversing component is detachably connected to the screw, which is easy to install, compact in structure, and easy to process the screw.

[0008] The present invention is further configured as follows: a guide groove is provided on the top of the reversing assembly, and when the commutator is plugged into the lead screw, the guide groove matches the outer diameter of the lead screw, and the commutator is distributed in a stepped manner along the circumference of the lead screw, and the commutators are located on different horizontal planes. The commutator is obliquely arranged on the side of the lead screw, and the inclination directions of each commutator are the same, and the open upper end of the commutator is arranged as an arc top, and the curvature of the arc matches the curvature of the outer side of the lead screw.

[0009] By adopting the above technical solution, after the commutation assembly is installed, the guide groove at the top of the commutator matches the outer diameter of the screw, and the curvature of the top of the commutator matches the curvature of the outside of the screw, preventing the screw and the nut from getting stuck during rotation. The commutator is distributed in steps around the screw, and can circulate multiple sets of balls at the same time.

[0010] The present invention is further configured as follows: the inner wall of the commutator is also provided with a plurality of oil holes, the oil holes are filled with lubricating oil, and a sealing ring is provided on the oil hole, a metal sleeve for fixing is provided in the sealing ring, a mounting groove is provided on the top of the sealing ring, a rubber ring matching the depth of the mounting groove is provided in the mounting groove, the lubricating oil is arranged in the sealing ring, the inner diameter of the sealing ring is d1, the inner diameter of the metal sleeve is d2, and the ratio of d1 to d2 is 3:1, the depth of the mounting groove is h1, and the ratio of d1 to h1 is 6:1.

[0011] By adopting the above technical solution, the oil hole is sealed by the sealing ring, and the metal sleeve arranged inside the sealing ring can further enhance the rigidity of the sealing ring to prevent the sealing ring from being deformed during the transmission process. A rubber ring is arranged on the top of the sealing ring. When the ball passes through, the rubber ring can be slightly deformed to cause the lubricating oil to leak out, and a layer of lubricating oil film is formed on the inner wall of the commutator through the rolling of the ball, which greatly reduces the friction between the inner wall and the ball, thereby reducing wear and extending the service life. The ratio of the inner diameter of the sealing ring to the inner diameter of the metal sleeve is 3:1. The metal sleeve prevents the sealing ring from being deformed, maintains the sealing performance, does not affect the deformation of the rubber ring, and has a good lubrication effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of an embodiment of a ball screw with a reversing device of the present invention;

[0013] Figure 2 It is a schematic diagram of the screw structure of a ball screw with a reversing device of the present invention;

[0014] Figure 3 It is a schematic diagram of the commutator structure of a ball screw with a commutation device of the present invention;

[0015] Figure 4 This is a cross-sectional view of an oil hole of a ball screw with a reversing device according to the present invention;

[0016] Figure 5 A cross-sectional view of a ball screw with a reversing device according to the present invention;

[0017] The reference numerals in the figure are: 1. screw; 2. transmission part; 3. threaded groove; 4. commutator; 5. mounting body; 6. opening; 7. ball channel; 8. plug-in part; 9. plug-in groove; 10. guide groove; 11. oil hole; 12. sealing ring; 13. metal sleeve; 14. mounting groove; 15. rubber ring. DETAILED DESCRIPTION

[0018] Reference Figures 1 to 4 An embodiment of a ball screw with a reversing device according to the present invention is further described.

[0019] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to illustrate the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "on" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0020] Furthermore, relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0021] A ball screw with a reversing device comprises a screw 1 and a transmission member 2 arranged at the lower end of the screw 1, the screw 1 is provided with a threaded groove 3 for placing balls, the threaded groove 3 is configured as a path for the balls to roll, the screw 1 performs relative motion on the shaft through the rolling of the balls, the balls roll in the threaded groove 3 arranged on the screw 1, and are used to reduce the friction between the screw 1 and the nut during rotation, the threaded groove 3 is provided with a plurality of commutators 4, the commutator 4 is a part located outside the screw 1 and is a reversing component, the reversing component is configured to guide the balls in the screw 1 back, the balls circulate in the screw 1 through the reversing device on the screw 1, and the reversing component comprises a mounting body 5, openings 6 arranged on both sides of the mounting body 5, and a ball channel 7 arranged inside the mounting body 5, the openings on both sides 6 are connected to each other through ball channels 7, and the openings 6 on both sides of the commutator 4 are respectively arranged in two adjacent thread grooves 3, and the trajectory of the ball channel 7 in the mounting body 5 is set in a straight line. The diameter of the opening 6 in the commutator 4 is equal to the width of the thread groove 3 of the screw 1, and the surface of the connecting part between the bottom of the opening 6 of the commutator 4 and the bottom of the thread groove 3 of the screw 1 is smooth, and the ball enters the commutator 4 smoothly, so that the screw 1 operates smoothly and prevents the ball from colliding with the opening 6 and causing damage to the ball. The part of the rear end of the mounting body 5 extending from the inner side of the screw 1 is set as a plug-in portion 8, and the screw 1 is also provided with a plug-in groove 9 matching the plug-in portion 8. The commutator 4 and the screw 1 are detachably connected by inserting the plug-in portion 8 into the plug-in groove 9. The commutator 4 and the screw 1 are easy to install, the structure is compact, and the processing difficulty of the screw 1 is small.

[0022] Reference Figure 3A guide groove 10 is provided on the top of the reversing assembly. When the commutator 4 is plugged into the lead screw 1, the guide groove 10 matches the outer diameter of the lead screw 1, and the commutator 4 is distributed in a stepped manner along the circumference of the lead screw 1, and can simultaneously perform a circulation operation on multiple groups of balls, and the commutators 4 are located on different horizontal planes. The commutator 4 is obliquely arranged on the side of the lead screw 1, and the inclination direction of each commutator 4 is the same. The upper end of the opening 6 of the commutator 4 is an arc top setting, and the curvature of the arc matches the curvature of the outer side of the lead screw 1 to prevent the lead screw 1 and the nut from getting stuck during rotation.

[0023] Reference Figure 4 The top of the commutator 4 is also provided with a plurality of oil holes 11, the oil holes 11 are filled with lubricating oil, and the oil holes 11 are provided with sealing rings 12, the oil holes 11 are sealed by the sealing rings 12, the sealing rings 12 are provided with a metal sleeve 13 for fixing, which can further strengthen the rigidity of the sealing ring 12 and prevent the sealing ring 12 from deforming during the transmission process, the top of the sealing ring 12 is provided with a mounting groove 14, the mounting groove 14 is provided with a rubber ring 15 matching the depth of the mounting groove 14, the lubricating oil is arranged in the sealing ring 12, when the ball passes through The rubber ring 15 can be slightly deformed to cause the lubricating oil to leak out, and a layer of lubricating oil film is formed on the inner wall of the commutator 4 through the rolling of the ball, which greatly reduces the friction between the inner wall and the ball, thereby reducing wear and extending the service life. The inner diameter of the sealing ring 12 is d1, the inner diameter of the metal sleeve 13 is d2, and the ratio of d1 to d2 is 3:1. The depth of the mounting groove 14 is h1, and the ratio of d1 to h1 is 6:1. The length of the metal sleeve 13 is used to maintain the sealing performance without affecting the deformation of the rubber ring 15, and the lubrication effect is good.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A ball screw with a reversing device, comprising a screw (1) and a transmission member (2) arranged at the lower end of the screw (1), wherein the screw (1) is provided with a threaded groove (3) for accommodating a ball, wherein the threaded groove (3) is configured as a path for the ball to roll, and the screw (1) performs relative motion on the shaft through the rolling of the ball, characterized in that: A plurality of commutators (4) are arranged on the thread groove (3); the commutator (4) is a part located outside the lead screw (1) and is a commutation component; the commutation component is configured to guide the balls in the lead screw (1) back.

2. A ball screw with a reversing device according to claim 1, characterized in that: The commutation assembly comprises a mounting body (5), openings (6) arranged on both sides of the mounting body (5), and a ball channel (7) arranged inside the mounting body (5); the openings (6) on both sides are connected to each other through the ball channel (7); a portion of the mounting body (5) extending from the inner side of the lead screw (1) at the rear end is provided as a plug-in portion (8); a plug-in slot (9) matching the plug-in portion (8) is further provided on the lead screw (1); the commutator (4) and the lead screw (1) are detachably connected by inserting the plug-in portion (8) into the plug-in slot (9).

3. A ball screw with a reversing device according to claim 2, characterized in that: A guide groove (10) is provided at the top of the commutation component. When the commutator (4) and the lead screw (1) are plugged in, the guide groove (10) matches the outer diameter of the lead screw (1).

4. A ball screw with a reversing device according to claim 2, characterized in that: The commutators (4) are distributed in a stepped manner along the circumference of the lead screw (1), and the commutators (4) are located on different horizontal planes.

5. The ball screw with a reversing device according to claim 2, characterized in that: The commutator (4) is obliquely arranged on the side of the lead screw (1), and the inclination direction of each commutator (4) is the same. The openings (6) on both sides of the commutator (4) are respectively arranged in two adjacent thread grooves (3), and the trajectory of the ball channel (7) in the mounting body (5) is arranged in a straight line. The ball circulates in the adjacent thread grooves (3) through the commutator (4).

6. A ball screw with a reversing device according to claim 2, characterized in that: The diameter of the opening (6) in the commutator (4) is equal to the width of the thread groove (3) of the lead screw (1), and the surface of the connection portion between the bottom of the opening (6) of the commutator (4) and the bottom of the thread groove (3) of the lead screw (1) is smooth.

7. A ball screw with a reversing device according to claim 2, characterized in that: The upper end of the opening (6) of the commutator (4) is arranged as an arc top, and the curvature of the arc matches the curvature of the outer side of the lead screw (1).

8. The ball screw with a reversing device according to claim 2, characterized in that: The inner wall of the commutator (4) is also provided with a plurality of oil holes (11), the oil holes (11) are filled with lubricating oil, and the oil holes (11) are provided with sealing rings (12).

9. A ball screw with a reversing device according to claim 8, characterized in that: A metal sleeve (13) for fixing is arranged inside the sealing ring (12), a mounting groove (14) is arranged on the top of the sealing ring (12), a rubber ring (15) matching the depth of the mounting groove (14) is arranged inside the mounting groove (14), and the lubricating oil is arranged inside the sealing ring (12).

10. A ball screw with a reversing device according to claim 9, characterized in that: The inner diameter of the sealing ring (12) is d1, the inner diameter of the metal sleeve (13) is d2, and the ratio of d1 to d2 is 3:1; the depth of the installation groove (14) is h1, and the ratio of d1 to h1 is 6:1.

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