Small-lead rotary four-way ball nut screw

Abstract

The utility model discloses a small-lead rotary four-way ball nut lead screw which comprises a lead screw shaft, a nut is sleeved on the lead screw shaft, an internal thread is arranged in the nut, a plurality of first steel balls are connected in the internal thread in a rolling mode, the first steel balls are connected on the lead screw shaft in a rolling mode, and four first installation holes are evenly distributed on the outer wall of the nut. Circulators are fixedly connected into the first mounting holes, and the first steel balls are connected to the circulators in a rolling mode. The four first mounting holes are spirally arranged around the nut, and the included angle between every two adjacent first mounting holes is 90 degrees; according to the utility model, an innovative four-way split type internal circulation design is adopted, and the stroke of the steel ball is reduced to a quarter of the original stroke by utilizing the four circulators, so that the resistance in the operation process is effectively reduced, and the transmission stability and precision are further obviously improved; in addition, miniaturization of the device is achieved through the design, the occupied space is reduced, and the machining difficulty and the manufacturing cost are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical transmission devices, in particular to a small-lead rotary four-way ball nut screw. Background Art

[0002] As a mechanical device, the ball screw has the function of converting rotational motion into linear motion or converting linear motion into rotational motion. Existing small-lead rotary ball screws generally adopt end cover type and integral internal circulation structure. However, this design makes the processing of the ball groove particularly difficult, which not only increases the difficulty of manufacturing, but also makes it difficult to ensure the precision requirements during the manufacturing process. At the same time, due to the increase in processing difficulty, its manufacturing cost is also relatively high. Therefore, a small-lead rotary four-way ball nut screw is proposed. Utility Model Content

[0003] The utility model aims to provide a small-lead rotary four-way ball nut screw to solve the problems raised in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: a small-lead rotary four-way ball nut screw, including a screw shaft, a nut is sleeved on the screw shaft, an internal thread is provided in the nut, a plurality of first steel balls are rollingly connected in the internal thread, and the first steel balls are rollingly connected to the screw shaft, four first mounting holes are evenly distributed on the outer wall of the nut, a circulator is fixedly connected in the first mounting holes, and the first steel balls are rollingly connected to the circulator.

[0005] Preferably, the four first mounting holes are arranged in a spiral manner around the nut, and the angle between two adjacent first mounting holes is 90°.

[0006] Preferably, the distances between the center positions of the four first mounting holes and the end face of the nut are 16 mm, 28.5 mm, 41 mm and 53.5 mm respectively.

[0007] Preferably, a boss is provided on the nut, and a plurality of second mounting holes are opened on an outer wall on one side of the boss. The length of the nut is 106 mm, the diameter of the boss is 52 mm, and the length of the boss is 36 mm.

[0008] Preferably, two first grooves are provided on the boss, a plurality of second steel balls are rollingly connected in the first grooves, a sleeve is sleeved on the boss, a second groove is provided in the sleeve at a position corresponding to the first groove, and the second steel balls are rollingly connected in the second grooves, the diameter of the sleeve is 66 mm, and the length of the sleeve is 25 mm.

[0009] Preferably, the sleeve is provided with a flange, a plurality of third mounting holes are opened on the flange, and the diameter of the flange is 86 mm.

[0010] The small-lead rotary four-way ball nut screw provided by the utility model has the following advantages: the utility model adopts an innovative four-way split internal circulation design, which utilizes four circulators to reduce the stroke of the steel ball to one-fourth of the original, effectively reducing the resistance during operation, thereby significantly improving the stability and accuracy of the transmission; in addition, the design realizes the miniaturization of the device, which not only reduces the occupied space, but also greatly reduces the processing difficulty and manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0013] Figure 2 It is a schematic diagram of the overall main cutaway structure of the utility model;

[0014] Figure 3 This is a schematic diagram of the three-dimensional structure of the nut of the utility model;

[0015] Figure 4 It is a schematic diagram of the three-dimensional structure of the sleeve of the utility model.

[0016] In the figure: 1, screw shaft; 2, first steel ball; 3, nut; 31, internal thread; 32, first mounting hole; 33, boss; 34, first groove; 35, circulator; 36, second mounting hole; 4, second steel ball; 5, sleeve; 51, second groove; 52, flange; 53, third mounting hole. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-4, the utility model provides an embodiment: a small-lead rotary four-way ball nut screw, including a screw shaft 1, a nut 3 is sleeved on the screw shaft 1, an internal thread 31 is opened in the nut 3, a plurality of first steel balls 2 are rollingly connected in the internal thread 31, and the first steel balls 2 are rollingly connected to the screw shaft 1, four first mounting holes 32 are evenly distributed on the outer wall of the nut 3, a circulator 35 is fixedly connected in the first mounting holes 32, and the first steel balls 2 are rollingly connected to the circulator 35, the nut 3 accommodates the first steel balls 2 through the internal thread 31, the first steel balls 2 are used to realize the rolling friction between the screw shaft 1 and the nut 3, and the four circulators 35 are used to realize the internal circulation design, wherein two circulators 35 are a group, and the first steel balls 2 circulate back and forth in this group of circulators 35; the four first mounting holes 32 are arranged in a spiral rise around the nut 3, and the angle between two adjacent first mounting holes 32 is 90°; the distances between the center positions of the four first mounting holes 32 and the end face of the nut 3 are 16mm and 28.5mm respectively , 41mm and 53.5mm; a boss 33 is provided on the nut 3, and a plurality of second mounting holes 36 are provided on the outer wall of one side of the boss 33. The length of the nut 3 is 106mm, the diameter of the boss 33 is 52mm, the length of the boss 33 is 36mm, and the second mounting holes 36 on the boss 33 are used to install screws; two first grooves 34 are provided on the boss 33, and a plurality of second steel balls 4 are rollingly connected in the first grooves 34. A sleeve 5 is sleeved on the boss 33, and the sleeve 5 corresponds to the second steel balls 4 in the first grooves 34. A second groove 51 is opened at the position of a groove 34, and the second steel ball 4 is rollingly connected in the second groove 51. The diameter of the sleeve 5 is 66 mm, and the length of the sleeve 5 is 25 mm. The boss 33 accommodates the second steel ball 4 through the first groove 34, and the sleeve 5 accommodates the second steel ball 4 through the second groove 51; a flange 52 is provided on the sleeve 5, and a plurality of third mounting holes 53 are opened on the flange 52. The diameter of the flange 52 is 86 mm, and the third mounting holes 53 on the flange 52 are used for mounting screws.

[0019] Working principle: When the utility model is used, rolling friction is formed between the screw shaft 1 and the nut 3 through the first steel ball 2. By arranging the second steel ball 4 between the sleeve 5 and the boss 33, a supporting bearing structure is formed, which plays a role in supporting, bearing load and improving transmission accuracy. The utility model adopts four circulators 35 to realize the internal circulation design. Two circulators 35 form a group. The first steel ball 2 circulates back and forth in this group of circulators 35, shortening the stroke of the first steel ball 2 to one-fourth of the original, thereby greatly reducing the running resistance. When bearing the same load and torque, a smaller nut 3 can be used, which is conducive to miniaturization of the device, thereby reducing the processing cost; wherein, the nut 3 accommodates the first steel ball 2 through the internal thread 31, the first mounting hole 32 is used to install the circulator 35, the first groove 34 and the second groove 51 are used to install the second steel ball 4, the second mounting hole 36 and the third mounting hole 53 are used to install screws, and the flange 52 is used to connect with other external devices.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A small-lead rotary four-way ball nut screw, comprising a screw shaft (1), characterized in that: The screw shaft (1) is sleeved with a nut (3), the nut (3) is provided with an internal thread (31), a plurality of first steel balls (2) are rollingly connected in the internal thread (31), and the first steel balls (2) are rollingly connected to the screw shaft (1), and four first mounting holes (32) are evenly distributed on the outer wall of the nut (3), a circulator (35) is fixedly connected in each of the first mounting holes (32), and the first steel balls (2) are rollingly connected to the circulator (35).

2. The small lead rotary four-way ball nut screw according to claim 1, characterized in that: The four first mounting holes (32) are arranged in a spiral manner around the nut (3), and the angle between two adjacent first mounting holes (32) is 90°.

3. The small-lead rotary four-way ball nut screw according to claim 2, characterized in that: The distances between the center positions of the four first mounting holes (32) and the end surface of the nut (3) are 16 mm, 28.5 mm, 41 mm and 53.5 mm respectively.

4. The small lead rotary four-way ball nut screw according to claim 3, characterized in that: The nut (3) is provided with a boss (33), and a plurality of second mounting holes (36) are opened on an outer wall of one side of the boss (33). The length of the nut (3) is 106 mm, the diameter of the boss (33) is 52 mm, and the length of the boss (33) is 36 mm.

5. The small lead rotary four-way ball nut screw according to claim 4, characterized in that: The boss (33) is provided with two first grooves (34), and a plurality of second steel balls (4) are rollingly connected in the first grooves (34). A sleeve (5) is sleeved on the boss (33), and a second groove (51) is provided in the sleeve (5) at a position corresponding to the first grooves (34), and the second steel balls (4) are rollingly connected in the second grooves (51). The diameter of the sleeve (5) is 66 mm, and the length of the sleeve (5) is 25 mm.

6. The small-lead rotary four-way ball nut screw according to claim 5, characterized in that: The sleeve (5) is provided with a flange (52), and a plurality of third mounting holes (53) are opened on the flange (52). The diameter of the flange (52) is 86 mm.

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