Ball return and ball screw

Abstract

The utility model belongs to the technical field of ball screw, disclose a kind of ball return and ball screw, including the ball return of being fixedly installed in the screw shaft inside by fixing part, the screw shaft surface is equipped with thread ball channel, the downstream side and upstream side of ball return two ends respectively intercommunication thread ball channel.The ball screw includes the screw shaft of being equipped with ball return inside, and nut of length greater than screw shaft.Summarizing, a kind of ball screw and ball return of novel structure provided by the utility model have the advantages such as simple structure compact, easy to install, can effectively be applied to the ball screw assembly of nut length greater than screw shaft length.

Description

Technical Field

[0001] This utility model belongs to the field of ball screw technology, specifically relating to a ball reversing device and a ball screw. Background Technology

[0002] Currently, there are many ball screw devices on the market that can convert rotary motion into linear motion. A traditional ball screw consists of a circular screw with continuous helical grooves along its length, a driven nut with matching continuous helical grooves, and multiple balls that mate with the helical grooves. Typically, these ball screw devices have a bypass structure on the nut to allow the balls to recirculate within the helical grooves. However, this structure requires the circular screw length to be greater than the nut length, resulting in a larger overall size of the ball screw, making it difficult to assemble into a compact linear brake. Utility Model Content

[0003] In view of this, in order to solve the problems mentioned in the background art, the purpose of this utility model is to provide a ball reversing device and a ball screw.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A ball reversing device includes a ball reversing device fixedly installed inside a screw shaft by a fixing member. The screw shaft surface is provided with a threaded ball track, and the two ends of the ball reversing device are respectively connected to the downstream side and the upstream side of the threaded ball track.

[0006] Preferably, the ball reversing device includes a housing and a circulation channel formed by the housing.

[0007] Preferably, the shell is assembled from two half-shells.

[0008] Preferably, the middle part of the tube shell is provided with a convex limiting part that cooperates with the fixing member.

[0009] Preferably, the fastener is an elastic clamp.

[0010] Preferably, the fixing member has a concave limiting part in the middle that cooperates with the ball return device.

[0011] Preferably, the fastener has two deformable free ends, and the fastener's contraction or expansion deformation is performed by moving the two deformable free ends closer to or further away from each other.

[0012] Preferably, a bent portion is formed at the two deformable free ends extending into the fixing member.

[0013] A ball screw includes a screw shaft with an internal ball return mechanism and a nut with a length greater than the screw shaft. Both the inner circumferential surface of the nut and the outer circumferential surface of the screw shaft are provided with threaded ball tracks. Balls that mate with the threaded ball tracks are disposed between the nut and the screw shaft, and the ball return mechanism returns balls that have rolled to the downstream side of the threaded ball tracks on the screw shaft to the upstream side of the threaded ball tracks on the screw shaft.

[0014] Preferably, the screw shaft has an open mounting cavity, the ball reversing device is located in the mounting cavity, and the mounting cavity has a fixing groove on its surface wall that cooperates with the fixing component.

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] (1) This utility model provides a new ball return device that can be installed inside the screw shaft so that the balls circulate in the threaded ball track on the surface of the screw shaft; the ball return device includes a ball return device that is clamped by a fixing member, which has a simple structure and is easy to install.

[0017] (2) This utility model provides a ball screw with a nut length exceeding the screw shaft length, and a ball return device is adapted to be installed inside the screw shaft, making the overall ball screw size smaller and effectively applicable to ball screw assemblies with a nut length greater than the screw shaft length. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the fixing component and the ball reversing device of this utility model.

[0021] Figure 4 This is a schematic diagram of the ball reversing device structure of this utility model;

[0022] Figure 5 This is an exploded view of the ball reversing device of this utility model;

[0023] Figure 6 This is a schematic diagram of the mating structure between the ball reversing device and the screw shaft of this utility model;

[0024] In the figure: Fixing component-100; Concave limiting part-101; Deformable free end-102; Bending part-103; Ball return device-200; Tube shell-201; Half shell-201a, 201b; Circulation channel-202; Convex limiting part-203; Nut-300; Screw shaft-400; Mounting cavity-401; Fixing slot-402. Detailed Implementation

[0025] To further understand the content of this utility model, a detailed description of it is provided in conjunction with the accompanying drawings and embodiments. The structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art; they are not intended to limit the implementation of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of this utility model, should still fall within the scope of the technical content disclosed herein. Similarly, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model. It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein.

[0026] Existing ball screws, due to their circular screw length typically exceeding the thread length, limit their overall size, making miniaturization difficult and hindering their integration into compact linear brakes. In contrast, this invention provides a... Figure 1 The ball screw structure shown has a nut 300 that is longer than the screw shaft 400. In this structure, if a bypass structure is still used on the nut 300 to recirculate the balls, some balls will fall out of the threaded ball track at the misalignment between the nut 300 and the screw shaft 400, thus preventing the entire ball screw from operating normally.

[0027] In response to the above problems and in combination Figure 2 By installing a ball reversing device inside the screw shaft 400, the balls are circulated between the downstream and upstream sides of the threaded ball track of the screw shaft 400.

[0028] Continue to refer to Figure 2As shown, the inner circumferential surface of the nut 300 and the outer circumferential surface of the screw shaft 400 are both provided with threaded ball tracks. In addition, a ball (not shown in the figure) that cooperates with the threaded ball track is provided between the nut 300 and the screw shaft 400. The ball reversing device realizes the circulation of the ball.

[0029] In one executable embodiment, the screw shaft 400 has an open-end mounting cavity 401, and the ball reversing device is inserted and fixed in the mounting cavity 401 through the open end. Figure 2 As shown, end a of the screw shaft 400 is an open end, and end b of the screw shaft 400 is connected to the drive shaft.

[0030] Continue to refer to Figure 3 and Figure 4 As shown, the ball return device includes a fixing member 100 and a ball return device 200. The fixing member 100 is used to provide thrust to fix the ball return device 200. Thus, the screw shaft 400 has a through hole that connects the threaded ball track and the mounting cavity 401. The ball return device 200 is fixed in the mounting cavity 401 by the fixing member 100, and both ends of the ball return device 200 are connected to the downstream side and the upstream side of the threaded ball track of the screw shaft 400 through the through hole, respectively. When the ball rolls to the downstream side of the threaded ball track of the screw shaft 400, the ball can be returned to the upstream side of the threaded ball track of the screw shaft 400 through the ball return device 200.

[0031] In one executable embodiment, the ball reversing device 200 includes a housing 201 and a circulation channel 202 formed by the housing 201. The housing 201 is made of... Figure 5 The two half-shells 201a and 201b shown are assembled together. Half-shell 201a has a semi-circulation channel 202a, and half-shell 201b has a semi-circulation channel 202b. By assembling the two half-shells 201a and 201b, the semi-circulation channels 202a and 202b can be combined to form a circulation channel 202. Preferably, in this embodiment, the circulation channel 202 is an inclined channel that mates with a threaded ball track.

[0032] In another feasible embodiment, the housing 201 has a convex limiting portion 203 in its middle that cooperates with the fixing member 100. The fixing member 100 is an elastic clamp (such as one formed by a metal spring), and has a concave limiting portion 101 in its middle that cooperates with the ball return device 200. Figure 3 and Figure 4As shown in the structure, the ball return device 200 is positioned in connection with the threaded ball track. The concave limiting part 101 of the elastic clamp (fixing member 100) abuts against the convex limiting part 203 of the ball return device 200, thereby achieving the fixed installation of the ball return device 200.

[0033] In another executable embodiment, the fixing member 100 has two deformable free ends 102. The contraction or expansion deformation of the fixing member 100 is performed by the approach or distance of the two deformable free ends 102. In this embodiment, when the ball return device 200 is fixed by the fixing member 100, the two deformable free ends 102 are driven to approach by squeezing the fixing member 100 (elastic clamp), thereby causing the entire fixing member 100 (elastic clamp) to contract and deform inward, ensuring that the fixing member 100 can extend into the mounting cavity 401. When the concave limiting part 101 and the convex limiting part 203 are engaged, the fixing member 100 is released. At this time, the two deformable free ends 102 are driven to move away by the rebound of the fixing member 100 (elastic clamp), completing the outward expansion deformation of the fixing member 100, and making the fixing member 100 tightly fixed in the mounting cavity 401.

[0034] In another executable embodiment, bends 103 are formed extending inward from both of the two deformable free ends 102 into the fixing member 100. In this embodiment, when the ball reversing device 200 is secured by the fixing member 100, the two bends 103 are pressed together, thereby driving the two deformable free ends 102 closer together. This causes the entire fixing member 100 (elastic clamp) to contract and deform inward, ensuring that the fixing member 100 can extend into the mounting cavity 401. When the concave limiting part 101 engages with the convex limiting part 203, the two bends 103 are released. At this time, the two deformable free ends 102 are driven away by the rebound of the fixing member 100 (elastic clamp), completing the outward expansion deformation of the fixing member 100 and making the fixing member 100 tightly fixed in the mounting cavity 401. In this embodiment, the bends 103 extend inward from the fixing member 100, making the installation operation of the fixing member 100 more convenient.

[0035] In addition, a fixing groove 402 is provided on the surface wall of the mounting cavity 401 to cooperate with the fixing member 100, that is, the fixing member 100 can be locked in the fixing groove 402 after it is unfolded and deformed outward.

[0036] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A ball reversing device, characterized in that, Includes a ball return device (200) fixedly installed inside the screw shaft by a fastener (100), the screw shaft surface is provided with a threaded ball track, and the two ends of the ball return device (200) are respectively connected to the downstream side and the upstream side of the threaded ball track; The ball reversing device (200) includes a housing (201) and a circulation channel (202) enclosed by the housing (201). The shell (201) is assembled from two half-shells (201a, 201b); The tube shell (201) is provided with a convex limiting part (203) in the middle, which cooperates with the fixing member (100).

2. The ball reversing device according to claim 1, characterized in that: The fastener (100) is an elastic clamp.

3. The ball reversing device according to claim 1 or 2, characterized in that: The fixing member (100) has a concave limiting part (101) in the middle that cooperates with the ball return device (200).

4. The ball reversing device according to claim 3, characterized in that: The fastener (100) has two deformable free ends (102), and the fastener (100) is subjected to contraction or expansion deformation by moving the two deformable free ends (102) closer to or further away from each other.

5. The ball reversing device according to claim 4, characterized in that: At both of the two deformable free ends (102), a bend (103) is formed extending into the fixing member (100).

6. A ball screw, characterized in that: Includes a screw shaft (400) with an internal ball reversing mechanism, and a nut (300) with a length greater than that of the screw shaft (400); The ball return device is the ball return device as described in any one of claims 1-5; The inner circumferential surface of the nut (300) and the outer circumferential surface of the screw shaft (400) are both provided with threaded ball tracks. There are balls between the nut (300) and the screw shaft (400) that cooperate with the threaded ball tracks. The ball return device causes the balls that have rolled to the downstream side of the threaded ball tracks of the screw shaft (400) to return to the upstream side of the threaded ball tracks of the screw shaft (400).

7. The ball screw according to claim 6, characterized in that: The screw shaft (400) has an open mounting cavity (401) inside, the ball return device is located in the mounting cavity (401), and the mounting cavity (401) has a fixing groove (402) that cooperates with the fixing member (100) on its surface wall.

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