High-reliability ball screw

Abstract

The utility model relates to a high-reliability ball screw which comprises a screw body provided with an external thread; the first lead screw pair is provided with a first through hole, a first internal thread groove is formed in the inner wall of the first through hole, the first lead screw pair and the lead screw body are in internal and external thread connection, and a first ball is arranged between the first lead screw pair and the lead screw body; the second lead screw pair is provided with a second through hole, a second threaded groove is formed in the inner wall of the second through hole, the second lead screw pair and the lead screw body are in internal and external threaded connection, and a second ball is arranged between the second lead screw pair and the lead screw body; and the third lead screw pair is provided with a third through hole, a third threaded groove is formed in the inner wall of the third through hole, the third lead screw pair and the lead screw body are in internal and external threaded connection, and a third ball is arranged between the third lead screw pair and the lead screw body, so that the third lead screw pair can move on the lead screw body.

Description

Technical Field

[0001] This utility model relates to the field of ball screws, specifically to high-reliability ball screws. Background Technology

[0002] A ball screw typically consists of a screw and a ball screw assembly. The ball screw assembly has a through hole with threaded grooves on its inner wall, into which balls are embedded. The screw has external threaded grooves. The ball screw assembly and the screw are screwed together to form the ball screw. However, the stability of existing ball screws is not very good, and the reason lies in the ball screw assembly. For example, Chinese utility model patent application number CN202421378639.9 discloses a precision ball screw, including a screw body. The outer wall of the screw body is threadedly connected to an mounting sleeve. The inner wall of the mounting sleeve has a groove, and a set of ball bodies are arranged on the inner wall of the groove. In this invention, when the lead screw body rotates, it drives the mounting base one and the mounting sleeve on its surface to rotate. At this time, the mounting base one causes the two mounting bases two to rotate, and the two cleaning brushes slide on the surface of the lead screw body to remove contaminants, reducing the impact of contamination on the performance of the ball screw. Simultaneously, this device enables automatic cleaning of the lead screw body while it rotates, effectively reducing cleaning costs and downtime, thereby improving the production efficiency of related equipment. However, the small connection area between the mounting sleeve (equivalent to the ball screw pair) and the lead screw body in this patent leads to lower stability. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a highly reliable ball screw.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a high-reliability ball screw, comprising:

[0005] The lead screw body has an external thread.

[0006] The first lead screw pair has a first through hole, and a first internal thread groove is provided on the inner wall of the first through hole. The first lead screw pair and the lead screw body are connected by internal and external threads, and a first ball is provided between the first lead screw pair and the lead screw body, so that the first lead screw pair can move on the lead screw body.

[0007] The second lead screw assembly has a second through hole, and a second threaded groove is provided on the inner wall of the second through hole. The second lead screw assembly and the lead screw body are connected by internal and external threads, and a second ball is provided between the second lead screw assembly and the lead screw body, so that the second lead screw assembly can move on the lead screw body.

[0008] The third lead screw assembly has a third through hole, and a third threaded groove is provided on the inner wall of the third through hole. The third lead screw assembly and the lead screw body are connected by internal and external threads, and a third ball is provided between the third lead screw assembly and the lead screw body, so that the third lead screw assembly can move on the lead screw body.

[0009] The second lead screw pair and the third lead screw pair are in contact with each other, and there is a preset distance between the first lead screw pair and the second lead screw pair.

[0010] In some embodiments of this application, an external sleeve is also included, which is detachably fixed together with the first lead screw pair, the second lead screw pair, and the third lead screw pair by screws or bolts.

[0011] In some embodiments of this application, the external sleeve includes a first external sleeve, a second external sleeve, and a third external sleeve. The first external sleeve has a first through hole that extends axially through the first external sleeve. The first external sleeve fits the first lead screw assembly into the first through hole, thereby fixing the first external sleeve and the first lead screw assembly together. The second external sleeve has a second through hole that extends axially through the second external sleeve. The second external sleeve fits the second lead screw assembly into the second through hole, thereby fixing the second external sleeve and the second lead screw assembly together. The third external sleeve has a third through hole that extends axially through the third external sleeve. The third external sleeve fits the third lead screw assembly into the third through hole, thereby fixing the third external sleeve and the third lead screw assembly together.

[0012] In some embodiments of this application, a spiral steel ring is further included. The spiral steel ring is fixedly connected to the end face of the first lead screw pair on one side and fixedly connected to the end face of the second lead screw pair on the other side. The spiral steel ring and the lead screw body are connected by external threads. The spiral steel ring is used to enhance the stability of the movement of the first lead screw pair and the second lead screw pair on the lead screw body.

[0013] In some embodiments of this application, a refueling pipe is also included. A refueling through hole is provided on the third outer sleeve of the outer sleeve. The refueling through hole extends radially through the third outer sleeve. The refueling through hole and the third sleeve through hole are connected. The refueling pipe is fixedly inserted into the refueling through hole, so that the lubricating oil injected through the refueling pipe flows into the third sleeve through hole.

[0014] In some embodiments of this application, the first through hole of the first external sleeve is connected to the second through hole of the second external sleeve, and the second through hole of the second external sleeve is connected to the third through hole of the third external sleeve.

[0015] In some embodiments of this application, a first oil passage groove is provided on the outer surface of the second lead screw pair. The first oil passage groove is radially recessed to a predetermined depth from the outer wall of the second lead screw pair and extends along the length direction of the second lead screw pair. A second oil passage groove is provided on the outer surface of the third lead screw pair. The second oil passage groove is radially recessed to a predetermined depth from the outer wall of the third lead screw pair and extends along the length direction of the third lead screw pair. The first oil passage groove and the second oil passage groove are connected, and the second oil passage groove is connected to the third sleeve through hole of the third outer sleeve, so that the lubricating oil in the oil filling pipe flows into the first oil passage groove, and the lubricating oil in the first oil passage groove flows into the external thread of the lead screw body.

[0016] The beneficial effects of this application are: Firstly, the high-reliability ball screw provided by this application has a simple structure and is easy to assemble. Secondly, it is equipped with three screw pairs and helical steel rings, and the three screw pairs and helical steel rings form a whole under the sleeve of the external sleeve, so that the three screw pairs and helical steel rings move synchronously on the screw body, thereby enhancing the stability and reliability of the ball screw. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of the high-reliability ball screw provided by this utility model.

[0018] Figure 2 Another structural schematic diagram of the high-reliability ball screw provided by this utility model.

[0019] Figure 3 A schematic diagram of the structure of the external sleeve of the high-reliability ball screw provided by this utility model. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0021] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0022] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0023] Please refer to Figure 1-3 This application provides a high-reliability ball screw (hereinafter referred to as "the ball screw"), which includes:

[0024] Lead screw body 1, wherein the lead screw body 1 is provided with external thread 10;

[0025] The first lead screw assembly 3 has a first through hole 30, and a first internal thread groove (not shown in the figure) is provided on the inner wall of the first through hole 30. The first lead screw assembly 3 and the lead screw body 1 are connected by internal and external threads, and a first ball (not shown) is provided between the first lead screw assembly 3 and the lead screw body 1, so that the first lead screw assembly 3 can move on the lead screw body 1.

[0026] The second lead screw assembly 4 has a second through hole 40, and a second threaded groove (not shown in the figure) is provided on the inner wall of the second through hole 40. The second lead screw assembly 4 and the lead screw body 1 are connected by internal and external threads, and a second ball (not shown) is provided between the second lead screw assembly 4 and the lead screw body 1, so that the second lead screw assembly 4 can move on the lead screw body 1.

[0027] The third lead screw assembly 5 has a third through hole 50, and a third threaded groove (not shown in the figure) is provided on the inner wall of the third through hole 50. The third lead screw assembly 5 and the lead screw body 1 are connected by internal and external threads, and a third ball (not shown) is provided between the third lead screw assembly 5 and the lead screw body 1, so that the third lead screw assembly 5 can move on the lead screw body 1.

[0028] The second lead screw assembly 4 and the third lead screw assembly 5 are abutted together, and there is a preset distance between the first lead screw assembly 3 and the second lead screw assembly 4.

[0029] In some embodiments of this application, please refer to Figure 1-3 The ball screw also includes an external sleeve 2, which is detachably fixed together with the first screw assembly 3, the second screw assembly 4, and the third screw assembly 5 by screws or bolts.

[0030] In some embodiments of this application, please refer to Figure 1-3 The external sleeve 2 includes a first external sleeve 21, a second external sleeve 22, and a third external sleeve 23. The first external sleeve 21 has a first through hole 210, which axially extends through the first external sleeve 21. The first external sleeve 21 fits the first lead screw assembly 3 into the first through hole 210, thereby fixing the first external sleeve 21 and the first lead screw assembly 3 together. The second external sleeve 22 has a second through hole 220, which axially extends through the first external sleeve 23. The second external sleeve 22 fits the second lead screw assembly 4 into the second through hole 220, thereby fixing the second external sleeve 22 and the second lead screw assembly 4 together. The third external sleeve 23 has a third through hole 230, which extends axially through the third external sleeve 23. The third external sleeve 23 fits the third lead screw assembly 5 into the third through hole 230, thereby fixing the third external sleeve 23 and the third lead screw assembly 5 together.

[0031] In some embodiments of this application, please refer to Figure 1-3 The ball screw also includes a helical steel ring 6, which is fixedly connected to the end face of the first lead screw assembly 3 on one side and fixedly connected to the end face of the second lead screw assembly 4 on the other side. The helical steel ring 6 is threadedly connected to the external thread 10 of the lead screw body 1. The helical steel ring 6 is used to enhance the stability of the movement of the first lead screw assembly 3 and the second lead screw assembly 4 on the lead screw body 1.

[0032] In some embodiments of this application, please refer to Figure 1-3 The ball screw also includes an oil filling pipe 7. The third outer sleeve 23 of the outer sleeve 2 is provided with an oil filling through hole 231. The oil filling through hole 231 extends radially through the third outer sleeve 23. The oil filling through hole 231 is connected to the third sleeve through hole 230. The oil filling pipe 7 is fixedly inserted into the oil filling through hole 231, so that the lubricating oil injected through the oil filling pipe 7 flows into the third sleeve through hole 230.

[0033] In some embodiments of this application, please refer to Figure 1-3 The first through hole 210 of the first external sleeve 21 is connected to the second through hole 220 of the second external sleeve 22, and the second through hole 220 of the second external sleeve 22 is connected to the third through hole 230 of the third external sleeve 23.

[0034] In some embodiments of this application, please refer to Figure 1-3 A first oil passage groove 41 is provided on the outer surface of the second lead screw assembly 4. The first oil passage groove 41 is recessed radially to a predetermined depth from the outer wall of the second lead screw assembly 4 and extends along the length direction of the second lead screw assembly 4. A second oil passage groove 51 is provided on the outer surface of the third lead screw assembly 5. The second oil passage groove 51 is recessed radially to a predetermined depth from the outer wall of the third lead screw assembly 5 and extends along the length direction of the third lead screw assembly 5. The first oil passage groove 41 and the second oil passage groove 51 are connected. The second oil passage groove 51 is connected to the third sleeve through hole 230 of the third external sleeve 23, so that the lubricating oil in the oil filling pipe 7 flows into the first oil passage groove 41 and the lubricating oil in the first oil passage groove 41 flows into the external thread 10 of the lead screw body 1.

[0035] The high-reliability ball screw provided in this application has a simple structure and is easy to assemble. Furthermore, it is equipped with three screw pairs and helical steel rings, which are integrated into a whole under the sleeve of an external sleeve. This allows the three screw pairs and helical steel rings to move synchronously on the screw body, thereby enhancing the stability and reliability of the ball screw.

[0036] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A high-reliability ball screw, characterized in that, include: The lead screw body has an external thread. The first lead screw pair has a first through hole, and a first internal thread groove is provided on the inner wall of the first through hole. The first lead screw pair and the lead screw body are connected by internal and external threads, and a first ball is provided between the first lead screw pair and the lead screw body, so that the first lead screw pair can move on the lead screw body. The second lead screw assembly has a second through hole, and a second threaded groove is provided on the inner wall of the second through hole. The second lead screw assembly and the lead screw body are connected by internal and external threads, and a second ball is provided between the second lead screw assembly and the lead screw body, so that the second lead screw assembly can move on the lead screw body. The third lead screw assembly has a third through hole, and a third threaded groove is provided on the inner wall of the third through hole. The third lead screw assembly and the lead screw body are connected by internal and external threads, and a third ball is provided between the third lead screw assembly and the lead screw body, so that the third lead screw assembly can move on the lead screw body. The second lead screw pair and the third lead screw pair are in contact with each other, and there is a preset distance between the first lead screw pair and the second lead screw pair.

2. The ball screw according to claim 1, characterized in that, It also includes an external sleeve, which is detachably fixed together with the first lead screw pair, the second lead screw pair, and the third lead screw pair by screws or bolts.

3. The ball screw according to claim 2, characterized in that, The external sleeve includes a first external sleeve, a second external sleeve, and a third external sleeve. The first external sleeve has a first through hole that extends axially through the first external sleeve. The first external sleeve fits the first lead screw assembly into the first through hole, thereby fixing the first external sleeve and the first lead screw assembly together. The second external sleeve has a second through hole that extends axially through the second external sleeve. The second external sleeve fits the second lead screw assembly into the second through hole, thereby fixing the second external sleeve and the second lead screw assembly together. The third external sleeve has a third through hole that extends axially through the third external sleeve. The third external sleeve fits the third lead screw assembly into the third through hole, thereby fixing the third external sleeve and the third lead screw assembly together.

4. The ball screw according to claim 3, characterized in that, It also includes a spiral steel ring, which is fixedly connected to the end face of the first lead screw pair on one side and fixedly connected to the end face of the second lead screw pair on the other side, and the spiral steel ring is threadedly connected to the external thread of the lead screw body; the spiral steel ring is used to enhance the stability of the first lead screw pair and the second lead screw pair moving on the lead screw body.

5. The ball screw according to claim 3, characterized in that, It also includes a refueling pipe. The third outer sleeve of the outer sleeve is provided with a refueling through hole. The refueling through hole extends radially through the third outer sleeve. The refueling through hole and the third sleeve through hole are connected. The refueling pipe is fixedly inserted into the refueling through hole, so that the lubricating oil injected through the refueling pipe flows into the third sleeve through hole.

6. The ball screw according to claim 5, characterized in that, The first through hole of the first external sleeve is connected to the second through hole of the second external sleeve, and the second through hole of the second external sleeve is connected to the third through hole of the third external sleeve.

7. The ball screw according to claim 6, characterized in that, A first oil passage groove is provided on the outer surface of the second lead screw assembly. The first oil passage groove is recessed radially from the outer wall of the second lead screw assembly to a predetermined depth and extends along the length direction of the second lead screw assembly. A second oil passage groove is provided on the outer surface of the third lead screw assembly. The second oil passage groove is recessed radially from the outer wall of the third lead screw assembly to a predetermined depth and extends along the length direction of the third lead screw assembly. The first oil passage groove and the second oil passage groove are connected, and the second oil passage groove is connected to the third sleeve through hole of the third external sleeve, so that the lubricating oil in the oil filling pipe flows into the first oil passage groove, and the lubricating oil in the first oil passage groove flows into the external thread of the lead screw body.

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