Ball screw with high load bearing elbow circulator

Abstract

The utility model relates to the technical field of linear transmission devices, in particular to a ball screw with a high-bearing elbow circulator, which comprises a lead screw and a nut, the nut sleeves the lead screw, a spiral channel is arranged between the nut and the lead screw, and a steel ball is arranged in the spiral channel; the bent pipe is arranged on the outer side wall of the nut, the two ends of the bent pipe are connected with the nut, a circulation channel is arranged in the bent pipe and communicated with the spiral channel, and the length of the circulation channel is 0.5-0.6 time of the length of a single circle of the spiral channel. A plurality of bent pipes with short internal strokes are arranged on the same side of the nut to shorten an invalid operation curve of the steel balls in the whole ball screw structure, so that the ratio of the number of the steel balls actually borne in the spiral channel to the total number of the steel balls is large, a circulation path is effectively shortened under the condition of large lead, and the service life of the ball screw is prolonged. The bearing capacity of the ball screw during operation is improved, and the nut can move more stably in the axial direction of the screw.

Description

Technical Field

[0001] This application relates to the field of linear transmission device technology, and in particular to a ball screw with a high load-bearing bent tube circulator. Background Technology

[0002] Ball screws achieve stable, threaded movement of the nut along the screw's axial direction by the circulating rolling of steel balls between the nut and the screw. Most existing external circulation methods utilize a bent tube spanning both sides of the nut, with the tube's path tangent to the screw's groove path to ensure normal screw operation. However, this method involves a large number of steel balls within the bent tube, resulting in a longer ineffective running curve. Consequently, the ratio of the actual number of steel balls carried between the nut and the screw to the total number of steel balls is relatively small, sacrificing some load-bearing capacity and thus weakening the ball screw's load-bearing capacity. Utility Model Content

[0003] The technical problem to be solved by this utility model is that the ineffective running curve in the bending tube circulator of the existing ball screw is relatively long, and the load-bearing capacity of the ball screw is relatively weak.

[0004] Therefore, this utility model provides a ball screw with a high load-bearing bend circulator.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A ball screw with a high-load-bearing bend circulator, comprising,

[0007] Lead screw, and

[0008] A nut, which is fitted onto a lead screw, has a helical groove between the nut and the lead screw, and a steel ball is disposed in the helical groove;

[0009] A bend is provided on the outer wall of the nut, and both ends of the bend are connected to the nut. A circulation channel is provided inside the bend, and the circulation channel is connected to the spiral groove. The length of the circulation channel is 0.5-0.6 times the length of a single turn of the spiral groove.

[0010] Furthermore, a rotary device is connected to the end of the bend, and a rotary path is provided inside the rotary device. The rotary path is located between the spiral channel and the circulation channel, and is connected to both the spiral channel and the circulation channel.

[0011] Furthermore, the connection points between the rotary path and the spiral channel and the circulation channel are all arc-shaped transitions.

[0012] Furthermore, a first rotating surface tangent to the side wall of the circulation channel is provided at one end of the rotating path near the nut, and a second rotating surface tangent to the side wall of the spiral channel is provided at the other end of the rotating path. Both the first and second rotating surfaces are arc-shaped.

[0013] Furthermore, the rotary device is made of metal.

[0014] Furthermore, the rotary device is installed at one end of the bend, and the outer wall of the nut is milled with a mounting surface. The mounting surface is provided with a first mounting hole for installing the rotary device and a second mounting hole for installing the end of the bend.

[0015] Furthermore, multiple bends are provided, and all multiple bends are provided on the same side of the nut, corresponding to one bend. The mounting surface is provided with two second mounting holes. One second mounting hole communicates with the first mounting hole for inserting the end of the bend connected to the rotator, and the other second mounting hole communicates with the inner groove of the nut for inserting the other end of the bend.

[0016] Furthermore, the rotary device is installed at the end of the bend that is farther away from the axis of the nut.

[0017] Furthermore, a pressure plate is provided on the mounting surface, the pressure plate abuts against the side of the middle part of the bend away from the mounting surface, and the two ends of the pressure plate are fixed to the mounting surface by screws.

[0018] Furthermore, the middle portion of the pressure plate is configured to protrude away from the mounting surface and is adapted to the shape of the middle portion of the bend.

[0019] The beneficial effects of this utility model are that by setting multiple short-stroke bends on the same side of the nut to replace the large-span bend circulator, the ineffective running curve of the steel balls in the entire ball screw structure is shortened, the load loss of the bend circulation is reduced, and the ratio of the actual number of steel balls in the helical channel to the total number of steel balls is larger. Under the condition of large lead, the circulation path is effectively shortened, the load-bearing capacity of the ball screw in this application is improved, and the nut moves more stably along the screw axis. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the ball screw with a high load-bearing bent pipe circulator in this utility model.

[0022] Figure 2 This is a schematic diagram of the mounting surface in this utility model.

[0023] Figure 3 This is a schematic diagram showing the distribution of the first and second mounting holes on the mounting surface in this utility model.

[0024] Figure 4 This is a schematic diagram of the assembly relationship between the rotary device and the nut in this utility model.

[0025] Figure 5 This is a schematic diagram of the assembly of the bend and the rotary device in this utility model.

[0026] Figure 6 This is a schematic diagram of the structure of the first rotating surface in this utility model.

[0027] Figure 7 This is a schematic diagram of the structure of the second rotating surface in this utility model.

[0028] In the diagram: 1. Lead screw; 2. Nut; 21. Spiral groove; 22. Mounting surface; 23. First mounting hole; 24. Second mounting hole; 3. Rotary head; 31. Rotation path; 32. First rotation surface; 33. Second rotation surface; 4. Bend; 41. Circulation channel; 5. Pressure plate. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] A ball screw 1 with a high-load-bearing bend 4 circulation includes a screw 1, a nut 2, steel balls, a rotary device 3, a bend 4, and a pressure plate 5. The nut 2 is sleeved on the screw 1 and threadedly engaged with the screw 1. A helical groove 21 is provided between the screw 1 and the nut 2. Several steel balls are located in the helical groove 21 and achieve cyclic rolling through the rotary device 3 and the bend 4 provided on the outer wall of the nut 2.

[0033] A circulation channel 41 is provided inside the bend 4. The plane of the extension direction of the middle part of the bend 4 is parallel to the axis of the nut 2. Both ends of the bend 4 bend towards the side wall of the nut 2. The distance between the two ends of the bend 4 and the nut 2 is different. The rotary device 3 is installed at the end of the bend 4 that is farther away from the axis of the nut 2. This ensures that the maximum height that one end of the bend 4 can reach (ensuring smooth operation, and the design is still applicable to the present invention even below the maximum height) is achieved on the basis of maximizing the bearing path of the steel ball and ensuring smooth operation of the steel ball. That is, the outlet of the bend of the bend 4 is exactly connected to the rotary device 3.

[0034] The rotary device 3 is made of metal. A rotary path 31 is provided inside the rotary device 3. One end of the rotary path 31 near the bend 4 is provided with a first rotary surface 32 that communicates with the internal circulation channel 41 of the bend 4, so that the rotary path 31 is tangent to the internal circulation channel 41 of the bend 4. The other end of the rotary path 31 is provided with a second rotary surface 33 that communicates with the spiral groove 21, so that the rotary path 31 is tangent to the spiral groove 21. The first rotary surface 32 and the second rotary surface 33 are set in an arc shape, so that the corners are rounded and the edges are gradually rounded at the connection point between the rotary device 3 and the nut 2, reducing the possibility of ball jamming caused by steel ball impact, ensuring smooth operation of the lead screw 1, and reducing operating noise.

[0035] The outer wall of the nut 2 is milled with a mounting surface 22, which is used to mount the bend 4 and the rotator 3. The mounting surface 22 has a first mounting hole 23 for mounting the rotator 3. The bottom of the first mounting hole 23 is configured as a mounting platform for the rotator 3. The first mounting hole 23 is connected to the spiral channel 21, mainly to ensure that the rotator 3 is connected to the nut 2 channel and the circulation channel 41 during installation, ensuring smooth circulation of the steel balls. The mounting surface 22 has multiple second mounting holes 24. Each bend 4 has two second mounting holes 24. One second mounting hole 24 is connected to the first mounting hole 23 for inserting the end of the bend 4 connected to the rotator 3, and the other second mounting hole 24 is connected to the inner channel of the nut 2 for inserting the other end of the bend 4. Both ends of the bend 4 are inserted into the nut 2, thus ensuring the bend 4 is positioned correctly and does not move. It should be noted that multiple bends 4 can be provided on the nut 2, and the multiple bends 4 are all located on the same side of the nut 2. In this embodiment, there are two bends 4, and both bends 4 are installed on a mounting surface 22 on the nut 2.

[0036] The middle part of the pressure plate 5 is designed to protrude away from the mounting surface 22 and fit with the middle part of the bend 4. The pressure plate 5 abuts against the side of the middle part of the bend 4 away from the mounting surface 22, and the two ends of the pressure plate 5 are fixed to the mounting surface 22 by screws.

[0037] It should be noted that multiple bends 4 can be provided on the mounting surface 22, all of which are located on the same side of the nut 2. The length of the circulation channel 41 inside the bend 4 is 0.5-0.6 times the length of a single turn of the spiral groove 21, preferably 0.52 times. Therefore, compared with the existing large-span bend 4 circulator and the cross-side circulation method, the number of steel balls that can be carried in the circulation channel 41 inside the bend 4 of this application is less, and the ineffective running curve of the steel balls in the entire ball screw 1 structure is shorter, which reduces the load loss of the bend 4 circulation. As a result, the ratio of the actual number of steel balls carried in the spiral groove 21 to the total number of steel balls is larger. Under the condition of large lead, the circulation path is effectively shortened, the load-bearing capacity of the ball screw 1 during operation is improved, and the nut 2 moves more stably along the axial direction of the screw 1.

[0038] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined by the scope of the claims.

Claims

1. A ball screw with a high-load-bearing bend circulator, characterized in that, include, Lead screw (1), and Nut (2), the nut (2) is sleeved on the lead screw (1), a spiral groove (21) is provided between the nut (2) and the lead screw (1), and a steel ball is provided in the spiral groove (21); A bend (4) is provided on the outer wall of the nut (2). Both ends of the bend (4) are connected to the nut (2). A circulation channel (41) is provided inside the bend (4). The circulation channel (41) is connected to the spiral groove (21). The length of the circulation channel (41) is 0.5-0.6 times the length of a single turn of the spiral groove (21).

2. The ball screw with a high-load-bearing bent-tube circulator according to claim 1, characterized in that, The end of the bend (4) is connected to a rotary device (3), and a rotary path (31) is provided inside the rotary device (3). The rotary path (31) is located between the spiral channel (21) and the circulation channel (41), and is connected to both the spiral channel (21) and the circulation channel (41).

3. The ball screw with a high-load-bearing bent-tube circulator according to claim 2, characterized in that, The connection between the rotary path (31) and the spiral channel (21) and the circulation channel (41) is an arc transition.

4. The ball screw with a high-load-bearing bent-tube circulator according to claim 3, characterized in that, The rotary path (31) has a first rotary surface (32) tangent to the side wall of the circulation channel (41) at one end near the nut (2), and a second rotary surface (33) tangent to the side wall of the spiral channel (21) at the other end. Both the first rotary surface (32) and the second rotary surface (33) are arc-shaped.

5. The ball screw with a high-load-bearing bent-tube circulator according to claim 2, characterized in that, The rotary device (3) is made of metal.

6. The ball screw with a high-load-bearing bent-tube circulator according to claim 2, characterized in that, The rotary device (3) is installed at one end of the bend (4). The outer wall of the nut (2) is milled with a mounting surface (22). The mounting surface (22) is provided with a first mounting hole (23) for mounting the rotary device (3) and a second mounting hole (24) for mounting the end of the bend (4).

7. The ball screw with a high-load-bearing bent-tube circulator according to claim 6, characterized in that, Multiple bends (4) are provided, and all bends (4) are provided on the same side of the nut (2). For each bend (4), the mounting surface (22) is provided with two second mounting holes (24). One second mounting hole (24) communicates with the first mounting hole (23) for inserting the end of the bend (4) connected to the rotary device (3). The other second mounting hole (24) communicates with the inner groove of the nut (2) for inserting the other end of the bend (4).

8. The ball screw with a high-load-bearing bent-tube circulator according to claim 2, characterized in that, The rotary device (3) is installed at the end of the bend (4) that is farther away from the axis of the nut (2).

9. The ball screw with a high-load-bearing bent-tube circulator according to claim 6, characterized in that, A pressure plate (5) is provided on the mounting surface (22). The pressure plate (5) abuts against the middle part of the bend (4) on the side away from the mounting surface (22). The two ends of the pressure plate (5) are fixed to the mounting surface (22) by screws.

10. The ball screw with a high-load-bearing bent-tube circulator according to claim 9, characterized in that, The middle part of the pressure plate (5) is configured to protrude in a direction away from the mounting surface (22) and is adapted to the shape of the middle part of the bend (4).

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