Inverted ball screw

Abstract

The utility model discloses a kind of reverse ball screws, include: screw rod, several back ball grooves, several pairs of limiting ribs, nut and several balls;The outer surface of screw rod is equipped with outer spiral groove, outer spiral groove has multiple spiral turns;Back ball groove is S-shaped, and is set on the outer surface of screw rod, back ball groove is connected across adjacent spiral turns;Several pairs of limiting ribs are set on the outer spiral groove of screw rod, and the rolling range of several balls is limited;Each back ball groove is correspondingly provided with a pair of limiting ribs, and a pair of limiting ribs are respectively arranged at the entrance and exit of corresponding back ball groove;Nut is sleeved on screw rod, the inner spiral groove of nut, several back ball grooves, the outer spiral groove of screw rod and several pairs of limiting ribs jointly constitute multiple closed ball circulation tracks;Several balls are respectively arranged in multiple ball circulation tracks.The utility model improves precision and stability, prolongs service life, improves load carrying capacity, maintenance cost is low, realizes overtravel control, processing is simple, and processing cost is low.

Description

Technical Field

[0001] This utility model relates to the field of ball screw technology, and in particular to a reversible ball screw. Background Technology

[0002] In the existing technology, most ball screws on the market use a return mechanism installed inside the nut. The return mechanism groove on the nut is complex to machine, requiring high precision and complex processing technology, which leads to high machining difficulty. In addition, since the return mechanism needs to be installed inside the nut, the outer diameter of the nut is relatively large, and the machining difficulty of the return mechanism is also high. The high precision and complex processing technology will increase production costs and processing time. Summary of the Invention

[0003] According to an embodiment of the present invention, a reversible ball screw is provided, comprising: a screw, a plurality of ball return grooves, a plurality of pairs of limiting ribs, a nut, and a plurality of balls; The outer surface of the lead screw is provided with an external helical groove, which has multiple helical turns; The ball return groove is S-shaped and is opened on the outer surface of the lead screw. The ball return groove spans the adjacent spiral rings and has an inlet and outlet, which are smoothly connected to the adjacent spiral rings respectively. Several pairs of limiting ribs are set on the outer spiral groove of the lead screw. The limiting ribs are arc-shaped and match the outer spiral groove. The limiting ribs limit the rolling range of several balls. Each bead return groove is provided with a pair of limiting ribs, which are respectively set at the inlet and outlet of the corresponding bead return groove and are arranged diagonally. The nut is fitted onto the lead screw. The inner spiral groove of the nut, several ball return grooves, the outer spiral groove of the lead screw, and several pairs of limiting ribs together form multiple closed ball circulation tracks. Several balls are arranged in multiple ball circulation tracks.

[0004] Furthermore, it also includes: a pair of limiting snap rings, which are respectively disposed at both ends of the nut and on the inner surface of the nut, and the pair of limiting snap rings limit the travel of the lead screw.

[0005] Furthermore, the limiting ribs are made of stainless steel.

[0006] Furthermore, the hardness of the limiting ribs is greater than 30 HRC.

[0007] Furthermore, the centers of several ball return grooves are located on the same straight line parallel to the screw axis, and the several ball return grooves are evenly spaced along the axial direction of the screw.

[0008] Furthermore, several ball return grooves are evenly spaced around the lead screw and are evenly spaced along the axial direction of the lead screw.

[0009] Furthermore, several pairs of limiting ribs are glued or welded to the lead screw.

[0010] Furthermore, the number of return grooves is half the number of spiral coils.

[0011] The reversible ball screw according to the present invention improves accuracy and stability, extends service life, increases load-bearing capacity, has low maintenance costs, achieves overtravel control, and is simple and inexpensive to manufacture.

[0012] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the reversible ball screw according to an embodiment of the present invention; Figure 2 This is a cross-sectional schematic diagram of a reversible ball screw according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the screw structure of the reversible ball screw according to an embodiment of the present invention.

[0014] Attached reference numerals: lead screw 1, outer spiral groove 11, ball return groove 2, limiting rib 3, nut 4, inner spiral groove 41, ball 5, limiting snap ring 6. Detailed Implementation

[0015] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, further illustrating the present invention.

[0016] First, combine Figures 1-3 The reversible ball screw 1 according to an embodiment of the present invention is used for mechanical transmission and has a wide range of applications.

[0017] like Figures 1-3 As shown, the reversible ball screw 1 of this utility model embodiment includes: screw 1, several ball return grooves 2, several pairs of limiting ribs 3, nut 4 and several balls 5.

[0018] Specifically, such as Figures 1-3As shown, in this embodiment, the outer surface of the lead screw 1 is provided with an outer helical groove 11 to guide the balls 5 to move along the helical path. The outer helical groove 11 has multiple helical coils. The return ball groove 2 is S-shaped, which can reduce the impact and vibration when the balls 5 turn. It is opened on the outer surface of the lead screw 1. The return ball groove 2 spans adjacent helical coils and has an inlet and an outlet. The inlet and outlet are smoothly connected to the adjacent helical coils to avoid stress concentration and extend service life. Several pairs of limiting ribs 3 are provided on the outer helical groove 11 of the lead screw 1. The limiting ribs 3 are arc-shaped and match the outer helical groove 11. The limiting ribs 3 limit the movement of several balls 5. The rolling range is defined by the limiting ribs 3, which ensure the closure of the ball circulation track. Each ball return groove 2 is provided with a pair of limiting ribs 3, which are respectively set at the entrance and exit of the corresponding ball return groove 2 and are diagonally arranged. The connection between the limiting ribs 3 and the ball return groove 2 is a smooth arc shape, which matches the shape of the ball return groove 2, maintains stability, and prevents jumping. The nut 4 is fitted on the lead screw 1. The inner spiral groove 41 of the nut 4, several ball return grooves 2, the outer spiral groove 11 of the lead screw 1, and several pairs of limiting ribs 3 together form multiple closed ball circulation tracks. Several balls 5 are arranged in the multiple ball circulation tracks. In this embodiment, the axial length of the inner spiral groove 41 of the nut 4 is greater than the axial length of the outer spiral groove 11 of the lead screw 1. In traditional ball screws, the return mechanism is mounted on the nut 4, resulting in a large deviation between the ball 5 and the raceway. In this embodiment, the reversible ball screw 1 has a return groove 2 directly opened on the screw 1, which stabilizes the movement trajectory of the ball 5 and reduces the deviation between the ball 5 and the raceway. This significantly improves the transmission and positioning accuracy of the screw 1, while also greatly saving materials and simplifying and speeding up the manufacturing process. The return groove 2 and the screw 1 are integrated, enhancing the load-bearing capacity and enabling it to withstand higher axial impact loads.

[0019] Furthermore, such as Figures 1-3 As shown, in this embodiment, it also includes: a pair of limiting spring clips 6, which are respectively disposed at both ends of the nut 4 and on the inner surface of the nut 4, and limit the travel of the lead screw 1. Traditional ball screws 1 often experience overtravel during use, causing the balls 5 to fall out. Since installing the balls 5 requires specialized tools, the ball screw 1 needs to be sent back to the manufacturer for repair, increasing the user's usage period. In this embodiment, the ball screw 1 has wire spring clips 6 installed at both ends of the nut 4 to prevent the balls 5 from falling out due to overtravel.

[0020] Furthermore, such as Figures 1-3 As shown, in this embodiment, the limiting rib 3 is made of stainless steel, and the hardness of the limiting rib 3 is greater than 30HRC, which ensures wear resistance and can withstand repeated impact loads generated by high-speed movement.

[0021] Furthermore, such as Figures 1-3As shown, in this embodiment, the centers of several ball return grooves 2 are located on the same straight line parallel to the axis of the lead screw 1, and the several ball return grooves 2 are evenly spaced along the axial direction of the lead screw 1.

[0022] Preferably, in this embodiment, a plurality of ball return grooves 2 are evenly spaced around the lead screw 1 and are also evenly spaced along the axial direction of the lead screw 1. That is, the plurality of ball return grooves 2 are evenly spaced along both the radial and axial directions and are staggered, so that the balls 5 are subjected to more uniform force during movement, avoiding local excessive wear and improving service life.

[0023] Furthermore, such as Figures 1-3 As shown, in this embodiment, several pairs of limiting ribs 3 are glued or welded to the ball screw 1, preferably welded, so that the ball screw 1 does not need to be tightened or the limiting ribs 3 replaced periodically, reducing maintenance costs.

[0024] Furthermore, such as Figures 1-3 As shown, in this embodiment, the number of ball return grooves 2 is half the number of spiral coils, ensuring comprehensive coverage by the ball return grooves 2. In this embodiment, there are 6 spiral coils and 3 ball return grooves 2, forming three closed ball circulation tracks.

[0025] Above, refer to Figures 1-3 The present invention describes a reversible ball screw according to an embodiment of the present invention, which improves accuracy and stability, extends service life, increases load-bearing capacity, reduces maintenance costs, achieves overtravel control, and is simple and inexpensive to manufacture.

[0026] It should be noted that, in this specification, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes that element.

[0027] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A reversible ball screw, characterized in that, Includes: lead screw, several ball return grooves, several pairs of limit ribs, nut and several balls; The outer surface of the lead screw is provided with an outer spiral groove, and the outer spiral groove has multiple spiral turns; The ball return groove is S-shaped and is formed on the outer surface of the lead screw. The ball return groove spans the adjacent spiral rings and has an inlet and outlet, which are smoothly connected to the adjacent spiral rings respectively. The plurality of pairs of limiting ribs are disposed on the outer helical groove of the lead screw, the limiting ribs are arc-shaped and match the outer helical groove, and the limiting ribs limit the rolling range of the plurality of balls; Each of the ball return grooves is detachably provided with a pair of limiting ribs, and the pair of limiting ribs are respectively provided at the inlet and outlet of the corresponding ball return groove and are arranged diagonally. The nut is fitted onto the lead screw, and the inner spiral groove of the nut, the plurality of ball return grooves, the outer spiral groove of the lead screw, and the plurality of pairs of limiting ribs together form multiple closed ball circulation tracks. The balls are arranged in multiple ball circulation tracks; the centers of the ball return grooves are located on the same straight line parallel to the lead screw axis.

2. The reversible ball screw as described in claim 1, characterized in that, It also includes: a pair of limiting snap rings, which are respectively disposed at both ends of the nut and on the inner surface of the nut, and the pair of limiting snap rings limit the travel of the lead screw.

3. The reversible ball screw as described in claim 1, characterized in that, The limiting rib is made of stainless steel.

4. The reversible ball screw as described in claim 3, characterized in that, The hardness of the limiting rib is greater than 30 HRC.

5. The reversible ball screw as described in claim 1, characterized in that, The plurality of ball return grooves are evenly spaced along the axial direction of the lead screw.

6. The reversible ball screw as described in claim 1, characterized in that, The plurality of ball return grooves are evenly spaced around the lead screw and are also evenly spaced along the axial direction of the lead screw.

7. The reversible ball screw as described in claim 1, characterized in that, The plurality of pairs of limiting ribs are glued or welded to the lead screw.

8. The reversible ball screw as described in claim 1, characterized in that, The number of return grooves is half the number of spiral coils.

Images