Novel ball screw and assembling method thereof

Abstract

The invention discloses a novel ball screw and an assembling method thereof, and the novel ball screw comprises a screw rod, a screw rod and a screw rod body, the ball return mechanism is installed on the lead screw, a ball return groove is formed in the ball return mechanism, and the two ends of the ball return groove are connected with the outer spiral groove of the lead screw in a matched mode; the nut is arranged on the lead screw in a sleeving mode, and the inner spiral groove of the nut, the ball returning groove and the outer spiral groove of the lead screw jointly form a ball circulating track; and the plurality of balls are sequentially arranged in the ball circulating track. Due to the fact that the reverser is installed on the lead screw, the machining process is relatively simple, time can be saved, and production efficiency is greatly improved; the collision force and the friction torque of the ball and the reverser are reduced, so that the ball screw runs more smoothly, and the dynamic performance is obviously improved; extra abrasion of the ball screw is reduced, the service life of the ball screw is prolonged, looseness of the reverser caused by transmission gaps and ball impact is eliminated, the service life of the ball screw is prolonged, and the reliability of the ball screw is improved.

Description

Technical Field

[0001] The invention relates to the technical field of screw rods, and in particular to a novel ball screw rod and an assembly method thereof. Background Art

[0002] In the prior art, the vast majority of ball nuts in the market use a return device installed inside the nut. The return device groove on the nut is complex to process, requiring high precision and complex processing technology, which makes the processing difficult. In addition, since the return device needs to be installed inside the nut, the outer diameter of the nut is relatively large, and the processing difficulty of the return device is also high. The high precision and complex processing technology as well as the processing of the return device will increase the production cost, processing difficulty and processing time. Summary of the invention

[0003] According to an embodiment of the present invention, a novel ball screw is provided, comprising: Screw rod; The bead return mechanism is installed on the screw rod, and a bead return groove is provided on the bead return mechanism, and the two ends of the bead return groove are matched and connected with the outer spiral groove of the screw rod; The nut is sleeved on the screw rod, and the inner spiral groove, the ball return groove of the nut and the outer spiral groove of the screw rod together form a ball circulation track; A plurality of balls are arranged in sequence in a ball circulation track.

[0004] Furthermore, the bead return groove is S-shaped.

[0005] Further, the bead return mechanism comprises: a matrix returner and a first mounting groove; The first mounting groove is provided on the screw rod; The matrix return device is installed in the first installation groove, and a plurality of return bead grooves are opened on the surface of the matrix return device.

[0006] Furthermore, the first installation groove is opened along the axial direction of the screw rod, and the first installation groove is a square groove.

[0007] Further, the bead return mechanism comprises: a plurality of oblate returners and a plurality of second mounting grooves; A plurality of second mounting grooves are evenly spaced around the screw rod and evenly spaced along the axial direction of the screw rod; A plurality of oblate circular return devices are installed in a plurality of second installation grooves in a one-to-one correspondence, and a bead return groove is provided on the surface of the oblate circular return device.

[0008] Furthermore, the second mounting groove is oval in shape.

[0009] Furthermore, the return device has a convex arc surface, and the convex arc surface and the outer cylindrical surface of the screw rod form a coplanar circumferential surface.

[0010] According to another embodiment of the present invention, a novel ball screw assembly method is provided, comprising the following steps: An axially arranged mounting groove is machined on the thread surface of the screw rod; Insert the return device with the processed ball return groove into the installation groove, and make the two ends of the ball return groove coincide with the external thread groove of the screw rod; Put a nut with pre-processed internal threads onto the outside of the screw rod; A plurality of balls are assembled between the screw and the nut.

[0011] Furthermore, the bead return groove is S-shaped.

[0012] Furthermore, the return device is a convex arc-surfaced cube, and the convex arc surface of the return device and the outer circumferential surface of the screw rod form a coplanar circumferential surface.

[0013] According to the new ball screw and its assembly method in the embodiment of the present invention, since the return device is installed on the screw, the processing technology is relatively simple, which can save time and greatly improve production efficiency; the collision force and friction torque between the ball and the return device are reduced, so that the ball screw runs more smoothly and the dynamic performance is significantly improved; the additional wear of the screw is reduced, the service life of the ball screw is extended, the loosening of the return device caused by transmission clearance and ball impact is eliminated, and the life and reliability of the ball screw are improved.

[0014] It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the technology as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a novel ball screw according to an embodiment of the present invention; Figure 2 It is a cross-sectional schematic diagram of a first embodiment of a novel ball screw according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the interior of a first embodiment of a novel ball screw according to an embodiment of the present invention; Figure 4 It is a cross-sectional schematic diagram of a second embodiment of a novel ball screw according to an embodiment of the present invention; Figure 5 Schematic diagram of the interior of a second embodiment of a novel ball screw according to an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to further illustrate the present invention.

[0017] First, combine Figures 1 to 5 A novel ball screw and an assembly method thereof according to an embodiment of the present invention are described, which are used in the field of mechanical transmission technology and have a wide range of application scenarios.

[0018] like Figures 1 to 5 As shown, the novel ball screw of the embodiment of the present invention comprises: a screw 1; a ball return mechanism, a nut 3 and a plurality of balls 4.

[0019] Specifically, Figures 1 to 5 As shown, the ball return mechanism is installed on the screw rod 1, and the ball return groove 21 is provided on the ball return mechanism, and the two ends of the ball return groove 21 are matched and bordered with the outer spiral groove 11 of the screw rod 1; the nut 3 is mounted on the screw rod 1, and the inner spiral groove of the nut 3, the ball return groove 21 and the outer spiral groove 11 of the screw rod 1 together constitute the circulation track of the ball 4; a plurality of balls 4 are arranged in sequence in the circulation track of the ball 4. Since the ball return mechanism is installed on the screw rod 1, the processing technology is relatively simple, which can save time and greatly improve production efficiency; the collision force and friction torque between the ball 4 and the ball return mechanism are reduced, so that the ball screw 1 runs more smoothly and the dynamic performance is significantly improved; the additional wear of the screw rod 1 is reduced, the service life of the ball screw 1 is extended, the loosening of the ball return mechanism caused by the transmission gap and the impact of the ball 4 is eliminated, and the life and reliability of the ball screw 1 are improved.

[0020] Further, if Figure 3 and Figure 5 As shown, in this embodiment, the ball return groove 21 is S-shaped, and its two ends are connected to the outer spiral groove 11 of the screw rod 1 for the internal circulation of the ball 4.

[0021] Embodiment 1: Figure 2~3 As shown, the ball return mechanism includes: a matrix return device 22 and a first mounting groove 23; the first mounting groove 23 is provided on the screw rod 1; the matrix return device 22 is installed in the first mounting groove 23, and a plurality of ball return grooves 21 are provided on the surface of the matrix return device 22. The first mounting groove 23 is provided along the axial direction of the screw rod 1, and the first mounting groove 23 is a square groove, which is simple and fast to process.

[0022] Embodiment 2: Figures 4 and 5 As shown, the ball return mechanism includes: a plurality of oblong return devices 24 and a plurality of second mounting grooves 25; the plurality of second mounting grooves 25 are evenly spaced around the screw rod 1 and evenly spaced along the axial direction of the screw rod 1; the plurality of oblong return devices 24 are mounted in the plurality of second mounting grooves 25 one by one, and the surface of the oblong return device 24 is provided with a ball return groove 21, that is, a single return device contains a single ball return groove 21. The second mounting groove 25 is oblong.

[0023] Further, if Figures 2~5 As shown, in this embodiment, the return device has a convex arc surface, and the convex arc surface forms a coplanar circumferential surface with the outer cylindrical surface of the screw rod 1 to ensure a smooth and continuous trajectory.

[0024] According to another embodiment of the present invention, a novel assembly method of a ball screw is provided, comprising the following steps: machining an axially arranged mounting groove on the threaded surface of the screw 1; embedding a return device with a processed return ball groove 21 into the mounting groove, and making the two ends of the return ball groove 21 coincide with the external thread groove of the screw 1; fitting a nut 3 pre-machined with an internal thread outside the screw 1; and fitting a plurality of balls 4 between the screw 1 and the nut 3. The return device pre-installation, nut fitting, and ball injection are implemented step by step, supporting assembly line operation and being compatible with automated equipment.

[0025] Furthermore, in this embodiment, the ball return groove 21 is S-shaped, and the return device is a convex arc-surfaced cube. The convex arc surface of the return device and the outer cylindrical surface of the screw rod 1 form a coplanar circumferential surface to ensure smooth ball return.

[0026] Above, refer to Figures 1 to 5 A new ball screw and an assembly method thereof according to an embodiment of the present invention are described. Since the return device is installed on the screw, the processing technology is relatively simple, which can save time and greatly improve production efficiency; the collision force and friction torque between the ball and the return device are reduced, so that the ball screw runs more smoothly and the dynamic performance is significantly improved; the additional wear of the screw is reduced, the service life of the ball screw is extended, the loosening of the return device caused by transmission clearance and ball impact is eliminated, and the life and reliability of the ball screw are improved.

[0027] It should be noted that, in this specification, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0028] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A new type of ball screw, characterized in that: Include: Screw rod; A bead return mechanism, the bead return mechanism is installed on the screw rod, the bead return mechanism is provided with a bead return groove, and both ends of the bead return groove are matched and bordered with the outer spiral groove of the screw rod; A nut, wherein the nut is sleeved on the screw rod, and the inner spiral groove of the nut, the ball return groove and the outer spiral groove of the screw rod together form a ball circulation track; A plurality of balls are arranged in sequence in the ball circulation track.

2. The new ball screw as claimed in claim 1 is characterized in that: The bead return groove is S-shaped.

3. The new ball screw as claimed in claim 1 is characterized in that: The bead return mechanism comprises: a matrix return device and a first mounting groove; The first mounting groove is provided on the screw rod; The matrix return device is installed in the first installation groove, and a plurality of return bead grooves are provided on the surface of the matrix return device.

4. The new ball screw as claimed in claim 3 is characterized in that: The first mounting groove is opened along the axial direction of the screw rod, and the first mounting groove is a square groove.

5. The new ball screw as claimed in claim 1 is characterized in that: The bead return mechanism comprises: a plurality of oblate return devices and a plurality of second mounting grooves; The plurality of second mounting grooves are evenly spaced around the screw rod and evenly spaced along the axial direction of the screw rod; The plurality of oblong return devices are installed in the plurality of second installation grooves in a one-to-one correspondence, and the surface of the oblong return device is provided with the return bead groove.

6. The novel ball screw as claimed in claim 5, characterized in that: The second mounting groove is in an oblate shape.

7. The novel ball screw as claimed in claim 3 or 5, characterized in that: The return device has a convex arc surface, and the convex arc surface and the outer circular surface of the screw rod form a coplanar circumferential surface.

8. A novel assembly method of a ball screw, characterized in that: The following steps are included: An axially arranged mounting groove is machined on the thread surface of the screw rod; The return device with the processed return ball groove is embedded into the installation groove, and the two ends of the return ball groove are matched with the external thread groove of the screw rod; Putting a nut pre-processed with an internal thread onto the outside of the screw rod; A plurality of balls are assembled between the screw rod and the nut.

9. The assembly method of the novel ball screw as claimed in claim 8, characterized in that: The bead return groove is S-shaped.

10. The assembly method of the novel ball screw as claimed in claim 8, characterized in that: The return device is a convex arc-surfaced cube, and the convex arc surface of the return device forms a coplanar circumferential surface with the outer circumferential surface of the screw rod.

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