External circulation type reversing ball screw

Abstract

The utility model discloses an external circulation type reverse rotation ball screw which comprises a screw rod, an external spiral groove is formed in the outer surface of the screw rod, and an internal spiral groove is formed in the external spiral groove. An inner spiral groove is formed in the inner surface of the nut, the nut is arranged on the lead screw in a sleeving mode, and the outer spiral groove and the inner spiral groove are matched with each other to form a rolling track; the plurality of balls are arranged in the rolling track; and the ball return mechanism is arranged in the screw rod, is matched and bordered with the outer spiral groove, and is used for circulating backflow of the plurality of balls. According to the utility model, the processing difficulty is reduced to a great extent, the production efficiency is improved, the universality and the application range are improved, the smoothness of the screw rod is also improved, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of ball screw technology, and in particular to an external circulation type reverse ball screw. Background Technology

[0002] In the existing technology, external circulation ball screws usually place the ball return guide outside the nut surface, which results in structural protrusions that are prone to interference, large nut radial diameter, and limited applicable range; internal circulation ball screws are limited by inherent problems such as short cross-coil distance, sharp bends, and small load. Summary of the Invention

[0003] According to an embodiment of the present invention, an external circulation reversing ball screw is provided, comprising:

[0004] The lead screw has an external helical groove on its outer surface;

[0005] The nut has an inner spiral groove on its inner surface. The nut is fitted onto the lead screw, and the outer spiral groove and the inner spiral groove cooperate to form a rolling track.

[0006] A number of balls are arranged in a rolling track;

[0007] The ball return mechanism is located inside the lead screw and is matched and connected to the outer spiral groove. The ball return mechanism is used for the circulation and return of several balls.

[0008] Furthermore, the return-to-bead mechanism includes:

[0009] The ball return channel is located inside the lead screw.

[0010] The return device is fixed on the lead screw and set at both ends of the return ball channel. The return device has a return ball hole, and the two ends of the return ball hole are respectively matched and connected to the return ball channel and the outer spiral groove. The return device guides several balls into the return ball channel.

[0011] Furthermore, the reversing device has a first convex arc surface and a second convex arc surface. The first convex arc surface is fitted into the inner spiral groove, and the second convex arc surface forms a coplanar circumferential surface with the outer circular surface of the lead screw.

[0012] Furthermore, the reversing device includes: a base and a top cover;

[0013] The top cover is placed on the base and fits into the base. The top cover and the base are fixed together on the lead screw.

[0014] The top surface of the base has a first bead return groove, and the bottom surface of the top cover has a second bead return groove. The first bead return groove and the second bead return groove interlock to form a bead return hole.

[0015] The two ends of the first bead return groove are smoothly connected to the bead return channel and the outer spiral groove, respectively.

[0016] Furthermore, the reversing mechanism is fixed to the lead screw with screws.

[0017] Furthermore, there is a pair of return channels, which are symmetrically arranged around the axis of the lead screw.

[0018] 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 rolling stroke of a number of balls.

[0019] The external circulation reversing ball screw according to the present invention greatly reduces the processing difficulty, improves production efficiency, enhances its versatility and applicability, improves screw smoothness, and extends service life.

[0020] 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

[0021] Figure 1 This is a schematic diagram of the external circulation reversing ball screw according to an embodiment of the present invention;

[0022] Figure 2 This is a cross-sectional schematic diagram of an external circulation reversing ball screw according to an embodiment of the present invention;

[0023] Figure 3 This is an internal schematic diagram of an external circulation reversing ball screw according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the ball recirculation of an external circulation reversing ball screw according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the reversing device of the external circulation type reversing ball screw according to an embodiment of the present invention;

[0026] Figure 6 This is a top view of the reversing device base of the external circulation reversing ball screw according to an embodiment of the present invention;

[0027] Figure 7 This is a bottom view of the top cover of the reversing device of the external circulation type reversing ball screw according to an embodiment of the present invention.

[0028] Reference numerals: 1. Lead screw; 11. Outer spiral groove; 2. Nut; 21. Inner spiral groove; 3. Limiting snap ring; 4. Ball bearing; 5. Return ball channel; 6. Reverse device; 61. Top cover; 62. Base; 63. Screw; 64. First convex arc surface; 65. Second convex arc surface; 66. Return ball hole; 66. First return ball groove; 661. Second return ball groove; 662. Detailed Implementation

[0029] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, further illustrating the present invention.

[0030] First, combine Figures 1-7 The external circulation reversing ball screw 1 according to an embodiment of the present utility model is used for mechanical transmission and has a wide range of applications.

[0031] like Figures 1-7 As shown, the external circulation reversing ball screw 1 of this utility model embodiment includes: screw 1, nut 2, a plurality of balls 4 and ball return mechanism.

[0032] Specifically, such as Figures 1-7 As shown, in this embodiment, the outer surface of the lead screw 1 is provided with an outer helical groove 11; the inner surface of the nut 2 is provided with an inner helical groove 21. The nut 2 is fitted onto the lead screw 1. The outer helical groove 11 and the inner helical groove 21 cooperate to form a rolling track, which is used for the rolling balls 4 to roll. Several balls 4 are arranged in the rolling track. The ball return mechanism is provided inside the lead screw 1 and is matched and connected with the outer helical groove 11. The ball return mechanism is used for the cyclic return of several balls 4. Since the ball return mechanism is installed on the lead screw 1, the shaft diameter of the lead screw 1 is not limited by the installation position of the return device 6, which allows the nut 2 to adapt to more lead screws of different specifications and application scenarios, improving versatility and applicability. The ball return channel 5 is built into the lead screw 1, which simplifies the structure of the nut 2 and makes the nut 2 more compact. By adopting an external circulation ball return mechanism, the number of turns of the ball 4 is increased, which increases the load on the nut 2, reduces the additional wear on the screw 1, and extends the service life of the ball screw 1; it also eliminates transmission backlash and loosening of the return device 6 caused by the impact of the ball 4, thus improving the life and reliability of the ball screw 1.

[0033] Furthermore, such as Figures 1-7 As shown, in this embodiment, the ball return mechanism includes: a ball return channel 5, which is disposed inside the lead screw 1; and a return device 6, which is fixed to the lead screw 1 and disposed at both ends of the ball return channel 5. The return device 6 has a ball return hole 66, the two ends of which are respectively matched and connected to the ball return channel 5 and the outer spiral groove 11. The return device 6 guides several balls 4 into the ball return channel 5 for reversing and connecting the balls 4. After the balls 4 have fully rolled in the rolling track, they can return from the "end" position of the rolling track to the "start" position of the rolling track through the ball return channel 5 and the ball return hole 66. By embedding the ball return channel 5 within the lead screw 1, the nut 2 does not need to integrate any ball return mechanism, significantly reducing the radial dimension and weight of the nut 2. This is particularly suitable for space-constrained scenarios and eliminates the risk of collision or damage to traditional external circulation cannulas. The ball return channel 5, the ball return hole 66, and the rolling track are all smoothly connected.

[0034] Furthermore, such as Figures 1-7 As shown, in this embodiment, the return device 6 has a first convex arc surface 64 and a second convex arc surface 65. The return ball hole 66 is disposed between the first convex arc surface 64 and the second convex arc surface 65. The first convex arc surface 64 is engaged with the inner spiral groove 21 to eliminate the interruption when the ball 4 disengages from the inner spiral groove 21 of the nut 2. The second convex arc surface 65 forms a coplanar circumferential surface with the outer circular surface of the lead screw 1, providing a continuous support boundary for the ball 4 to roll on the working track and preventing the ball 4 from axially moving and jumping.

[0035] Furthermore, such as Figures 1-7 As shown, in this embodiment, the return device 6 includes a base 62 and a top cover 61. The top cover 61 is placed on the base 62 and fits into it. The top cover 61 and the base 62 are fixed together on the lead screw 1. A first bead return groove 661 is formed on the top surface of the base 62, and a second bead return groove 662 is formed on the bottom surface of the top cover 61. The first bead return groove 661 and the second bead return groove 662 interlock to form a bead return hole 66. The two ends of the first bead return groove 661 are smoothly connected to the bead return channel 5 and the outer spiral groove 11, respectively. The complex bead return hole 66 is disassembled into the first bead return groove 661 and the second bead return groove 662, which facilitates ultra-high precision curved surface processing. A first convex arc surface 64 is provided on the top cover 61, and a second convex arc surface 65 is provided on the top cover 61 and the base 62.

[0036] Furthermore, such as Figures 1-7 As shown, in this embodiment, the return device 6 is fixed to the lead screw 1 by screw 63. The screw 63 passes through the top cover 61 and the base 62, fixing the top cover 61 and the base 62 together to the lead screw 1, which facilitates quick installation, maintenance and replacement.

[0037] Furthermore, such as Figures 1-7 As shown, in this embodiment, there is one ball return channel 5, and a return valve 6 is provided at both ends of the ball return channel 5 to realize the circulation and return of the balls 4; preferably, there is a pair of ball return channels 5, which are symmetrically arranged with the axis of the lead screw 1, and a return valve 6 is provided at both ends of each ball return channel 5 to enhance the balance of the lead screw 1 and reduce stress concentration.

[0038] Furthermore, such as Figures 1-7 As shown, in this embodiment, it also includes: a pair of limiting spring clips 3, which are respectively disposed at both ends of the nut 2 and on the inner surface of the nut 2. The pair of limiting spring clips 3 limit the rolling stroke of a plurality of balls 4. Traditional ball screws 1 often cause the balls 4 to fall out due to overtravel during use. Since installing the balls 4 requires professional tools, the ball screw 1 needs to be sent back to the manufacturer for repair, which increases the user's service life. In this embodiment, the ball screw 1 is equipped with wire retaining clips 3 at both ends of the nut 2 to prevent the balls 4 from falling out due to overtravel of the screw 1.

[0039] Above, refer to Figures 1-7 The present invention describes an external circulation reversing ball screw according to an embodiment of the present invention, which greatly reduces the processing difficulty, improves production efficiency, enhances its versatility and applicability, improves screw smoothness, and extends service life.

[0040] 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.

[0041] 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. An external circulation type reverse ball screw, characterized by, The utility model relates to a ball return mechanism of a ball screw, and belongs to the field of ball screw. The utility model discloses a ball screw, which comprises a screw rod, a nut and a plurality of balls. The outer surface of the screw rod is provided with an outer helical groove. The inner surface of the nut is provided with an inner helical groove. The nut is sleeved on the screw rod.

2. The external circulation type reverse ball screw according to claim 1, wherein The outer helical groove and the inner helical groove cooperatively form a rolling track. The plurality of balls are arranged in the rolling track. The ball return mechanism is arranged in the screw rod and matches the outer helical groove.

3. The external circulation type reverse ball screw according to claim 2, wherein The ball return mechanism comprises a ball return channel arranged inside the screw rod.

4. The external circulation type reverse ball screw according to claim 2 or 3, wherein A reverser is fixed on the screw rod and arranged at both ends of the ball return channel. The reverser is provided with a ball return hole. The ball return hole is matched with the ball return channel and the outer helical groove at both ends. The reverser guides the plurality of balls into the ball return channel.

5. The external circulation type reverse ball screw according to claim 2, wherein The reverser has a first convex arc surface and a second convex arc surface.

6. The external circulation type reverse ball screw according to claim 2, wherein The first convex arc surface is matched with the inner helical groove.

7. The external circulation type reverse ball screw according to claim 1, wherein The second convex arc surface forms a coplanar peripheral surface with the outer surface of the screw rod. The reverser comprises a base and a top cover. The top cover is placed on the base and matched with the base. The top cover and the base are fixed on the screw rod together. The top surface of the base is provided with a first ball return groove. The bottom surface of the top cover is provided with a second ball return groove. The first ball return groove and the second ball return groove are mutually buckled to form the ball return hole. The two ends of the first ball return groove are smoothly connected with the ball return channel and the outer helical groove. The reverser is fixed on the screw rod by a screw. The number of the ball return channels is a pair and symmetrically arranged along the axis of the screw rod. A pair of limiting clamping springs are arranged at both ends of the nut and on the inner surface of the nut. The pair of limiting clamping springs limit the rolling stroke of the plurality of balls.

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