Screw mounting structure and machine tool

Abstract

The utility model discloses screw mounting structure and lathe belong to lathe field, and screw is at least partial rotation and is installed in the inside of base, and screw includes thread section, installation section and extension section, and thread section is located between installation section and extension section, and installation section, thread section and extension section are integrally formed and are located on same straight line, and installation component is equipped with step portion, and installation component is set in the extension section of screw and is fixedly connected with base, and the first bearing and second bearing of bearing assembly are all installed in extension section and are located on both sides of step portion, and the first bearing and second bearing are coaxially arranged with screw, and lock nut is locked with the extension section of screw to resist bearing assembly, through above-mentioned design, and the first bearing and second bearing are installed on the same side of screw, and the length of support sleeve is shortened, and the material cost and processing cost of support sleeve are reduced, even if the length size of screw changes, the support sleeve can be invariable, so that not only cost is saved, but also the universality of parts is increased.

Description

Technical Field

[0001] This utility model relates to the field of machine tools, and in particular to a screw mounting structure and a machine tool including the screw mounting structure. Background Technology

[0002] A screw drive is a mechanical device that uses the meshing of a screw and a nut to achieve motion conversion and power transmission. Its core function is to convert rotary motion into linear motion or transmit thrust. A screw drive mainly consists of a screw (a threaded cylinder) and a nut (an internally threaded sleeve). When the screw rotates, if the nut is fixed, the screw moves axially; conversely, if the screw rotates, the nut undergoes linear displacement.

[0003] During installation, a bearing is installed between the screw and the mounting component in the screw drive structure. In the existing technology, the bearing is installed on both sides of the screw, so the required support sleeve length is very large, which results in relatively high material and processing costs. The longer the screw, the more significant the cost increase. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, one of the objectives of this utility model is to provide a screw installation structure in which the length of the support sleeve does not change with the length of the screw.

[0005] In order to overcome the shortcomings of the existing technology, the second objective of this utility model is to provide a machine tool in which the length of the support sleeve does not change with the length of the screw.

[0006] One of the objectives of this utility model is achieved through the following technical solution:

[0007] A screw mounting structure includes a base and a screw, the screw being at least partially rotatably mounted inside the base. The screw includes a threaded section, a mounting section, and an extension section. The threaded section is located between the mounting section and the extension section. The mounting section, the threaded section, and the extension section are integrally formed and located on the same straight line. The screw mounting structure also includes a mounting assembly, a bearing assembly, and a locking nut. The mounting assembly has a stepped portion. The mounting assembly is sleeved on the extension section of the screw and fixedly connected to the base. The bearing assembly includes a first bearing and a second bearing. The first bearing and the second bearing are both mounted on the extension section and located on both sides of the stepped portion. The first bearing and the second bearing are coaxially arranged with the screw. The locking nut is locked to the extension section of the screw to abut against the bearing assembly.

[0008] Furthermore, the first bearing has a first wide end face, and the second bearing has a second wide end face, with the first wide end face and the second wide end face being disposed opposite to each other.

[0009] Furthermore, the base includes a main body and a fixed end extending from one end of the main body. The main body has a hollow structure to form an installation space. One end of the main body is a closed structure, and the side of the main body with the fixed end is an open structure. The mounting section and the threaded section of the screw are located within the installation space. The extension section extends out from the installation space, and the mounting assembly is fixed to the fixed end to close the opening.

[0010] Furthermore, the screw mounting structure also includes a support assembly, which includes a support bearing. The support bearing is mounted on the mounting section of the screw and abuts against the base.

[0011] Furthermore, the support assembly also includes a retaining ring, which is installed on the mounting section of the screw and is located on the side of the support bearing away from the threaded section.

[0012] Furthermore, the mounting assembly includes a support sleeve and an end cap. The support sleeve extends into the mounting space and is fixed to the base. The stepped portion is disposed on the inner wall of the support sleeve, and the end cap is fixed to the support sleeve.

[0013] Furthermore, the locking nut is located inside the end cap.

[0014] Furthermore, the screw mounting structure also includes a sealing ring, which is installed between the end cap and the screw.

[0015] Furthermore, the screw mounting structure also includes a spacer sleeve, which is fitted onto the extension section and located between the second bearing and the locking nut.

[0016] The second objective of this utility model is achieved by the following technical solution:

[0017] Machine tools, including any of the above-mentioned screw mounting structures.

[0018] Compared to existing technologies, the mounting assembly of this utility model's screw mounting structure has a stepped portion. The mounting assembly is sleeved on the extension section of the screw and fixedly connected to the base. The bearing assembly includes a first bearing and a second bearing, both of which are mounted on the extension section and located on both sides of the stepped portion. The first and second bearings are coaxially arranged with the screw. The locking nut is locked to the extension section of the screw to abut against the bearing assembly. Through the above design, the first and second bearings are mounted on the same side of the screw, shortening the length of the support sleeve and reducing the material and processing costs of the support sleeve. Even if the length of the screw changes, the support sleeve can remain unchanged, thus saving costs and increasing the versatility of the parts. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the screw mounting structure of this utility model;

[0020] Figure 2 for Figure 1 Enlarged view of point A of the screw mounting structure.

[0021] In the diagram: 10, base; 11, main body; 110, installation space; 12, fixed end; 20, screw; 21, threaded section; 22, installation section; 23, extension section; 30, support assembly; 31, support bearing; 32, retaining ring; 40, installation assembly; 41, support sleeve; 410, stepped portion; 42, end cap; 50, bearing assembly; 51, first bearing; 510, first wide end face; 52, second bearing; 520, second wide end face; 60, spacer; 70, lock nut; 80, sealing ring. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or it can be fixed through another intermediate component. When a component is said to be "connected to" another component, it can be directly connected to the other component or it may be fixed through another intermediate component. When a component is said to be "set on" another component, it can be set directly on the other component or it may be set through another intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] Please see Figures 1 to 2 The screw mounting structure of this utility model includes a base 10, a screw 20, a support assembly 30, a mounting assembly 40, a bearing assembly 50, a spacer 60, a locking nut 70, and a sealing ring 80.

[0026] The base 10 includes a main body 11 and a fixed end 12 extending from one end of the main body 11. The main body 11 is used to install the screw 20, and the fixed end 12 is used to fix the mounting assembly 40. Specifically, the main body 11 has a hollow structure to form an installation space 110, the side of the main body 11 away from the fixed end 12 is a closed structure, and the side of the main body 11 near the fixed end 12 is an open structure.

[0027] The screw 20 includes a threaded section 21, a mounting section 22, and an extension section 23. The threaded section 21 is located between the mounting section 22 and the extension section 23. The mounting section 22, the threaded section 21, and the extension section 23 are integrally formed and located on the same straight line. The mounting section 22 and the threaded section 21 are located inside the base 10, and the extension section 23 extends out from the base 10.

[0028] A support assembly 30 is installed in the mounting section 22 of the screw 20. The support assembly 30 is located between the mounting section 22 and the inner wall of the base 10, and serves to support the screw 20. Specifically, the support assembly 30 includes a support bearing 31 and a retaining ring 32. The support bearing 31 is sleeved on the mounting section 22, and its outer ring contacts the inner wall of the base 10, providing support for the mounting section 22. The retaining ring 32 is installed in the mounting section 22 and located on the side of the support bearing 31 away from the threaded section 21, providing axial restraint for the support bearing 31.

[0029] Mounting assembly 40 includes a support sleeve 41 and an end cap 42. The support sleeve 41 is fixedly connected to the fixed end 12, and the end cap 42 is fixed to the support sleeve 41. The support sleeve 41 supports the extension 23 of the screw 20, and the end cap 42 encloses the mounting space 110. Specifically, the support sleeve 41 has a stepped portion 410, and the stepped portion 410 has retaining edges on both sides for mounting the bearing assembly 50.

[0030] The bearing assembly 50 includes a first bearing 51 and a second bearing 52. The first bearing 51 has a first wide end face 510, and the second bearing 52 has a second wide end face 520. Both the first bearing 51 and the second bearing 52 are sleeved on the extension section 23 of the screw 20. The first bearing 51 and the second bearing 52 are located on both sides of the stepped portion 410, with the first wide end face 510 and the second wide end face 520 facing each other, allowing the first bearing 51 and the second bearing 52 to be installed back-to-back. When assembling the bearing assembly 50, only a certain torque is needed to tighten the locking nut 70; no grinding spacer is required, greatly reducing the workload and difficulty during assembly. Furthermore, during prolonged operation, the screw 20 may generate heat and undergo some thermal expansion. In this application, the first bearing 51 and the second bearing 52 of the bearing assembly 50 are designed to be mounted back-to-back. The thermal expansion of the screw 20 causes the inner rings of the first bearing 51 and the second bearing 52 to move to the left and right respectively when the screw 20 moves. This increases the bearing clearance between the first bearing 51 and the second bearing 52, preventing jamming. The support assembly 30 provides only radial support, remaining free in the left and right directions, and can effectively withstand the axial thermal expansion of the screw 20. This solves the problem of potential bearing jamming.

[0031] A spacer 60 is fitted onto the extension 23 of the screw 20. The spacer 60 is located between the second bearing 52 and the locking nut 70 to prevent the locking nut 70 from damaging the second bearing 52. The locking nut 70 rotates to abut against the spacer 60, locking the bearing assembly 50.

[0032] The sealing ring 80 is installed between the end cap 42 and the screw 20 to provide a seal.

[0033] During screw 20 installation, support bearing 31 and retaining ring 32 are installed in mounting section 22, and first bearing 51 is installed in extension section 23. Mounting section 22 and threaded section 21 of screw 20 are inserted into mounting space 110, and support sleeve 41 partially extends into mounting space 110 and is locked and fixed to fixed end 12. Second bearing 52 and spacer 60 are installed sequentially, and locking nut 70 is used for tightening. Sealing ring 80 is installed inside end cap 42, which is fitted onto extension section 23 and fixed to support sleeve 41. Both first bearing 51 and second bearing 52 are fitted onto extension section 23 of screw 20, shortening the length of support sleeve 41 and reducing material and processing costs. Even if the length of screw 20 changes, support sleeve 41 can remain unchanged, thus saving costs and increasing the versatility of parts. The first bearing 51 and the second bearing 52 are installed back to back. When assembling the bearing assembly 50, it is only necessary to tighten the locking nut 70 with a certain torque. There is no need to use a grinding spacer, which greatly reduces the workload and difficulty of assembly.

[0034] When using the screw mounting structure of this application, the screw 20 heats up and undergoes thermal expansion during prolonged operation. This application designs the first bearing 51 and the second bearing 52 of the bearing assembly 50 to be mounted back-to-back. The thermal expansion of the screw 20 causes the inner rings of the first bearing 51 and the second bearing 52 to move to the left and right respectively when the screw 20 moves, increasing the bearing clearance and preventing jamming. The support assembly 30 provides only radial support, allowing for free movement in the left and right directions, effectively withstanding the axial thermal expansion of the screw 20 and thus resolving the potential bearing jamming problem.

[0035] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model. These are all equivalent modifications and improvements made to the above embodiments based on the essential technology of this utility model, and all of these fall within the protection scope of this utility model.

Claims

1. A screw mounting structure, comprising a base and a screw, wherein the screw is at least partially rotatably mounted inside the base, characterized in that: The screw includes a threaded section, an installation section, and an extension section. The threaded section is located between the installation section and the extension section. The installation section, the threaded section, and the extension section are integrally formed and located on the same straight line. The screw mounting structure also includes a mounting assembly, a bearing assembly, and a locking nut. The mounting assembly has a stepped portion. The mounting assembly is sleeved on the extension section of the screw and fixedly connected to the base. The bearing assembly includes a first bearing and a second bearing. The first bearing and the second bearing are both installed on the extension section and located on both sides of the stepped portion. The first bearing and the second bearing are coaxially arranged with the screw. The locking nut is locked to the extension section of the screw to abut against the bearing assembly.

2. The screw mounting structure according to claim 1, characterized in that: The first bearing has a first wide end face, and the second bearing has a second wide end face, with the first wide end face and the second wide end face being disposed opposite to each other.

3. The screw mounting structure according to claim 1, characterized in that: The base includes a main body and a fixed end extending from one end of the main body. The main body has a hollow structure to form an installation space. One end of the main body is a closed structure. The side of the main body with the fixed end is an open structure. The mounting section and the threaded section of the screw are located within the installation space. The extension section extends out from the installation space. The mounting assembly is fixed to the fixed end to close the opening.

4. The screw mounting structure according to claim 1, characterized in that: The screw mounting structure also includes a support assembly, which includes a support bearing. The support bearing is mounted on the mounting section of the screw and abuts against the base.

5. The screw mounting structure according to claim 4, characterized in that: The support assembly also includes a retaining ring, which is installed on the mounting section of the screw and is located on the side of the support bearing away from the threaded section.

6. The screw mounting structure according to claim 3, characterized in that: The mounting assembly includes a support sleeve and an end cap. A portion of the support sleeve extends into the mounting space. The support sleeve is fixed to the base. The stepped portion is disposed on the inner wall of the support sleeve. The end cap is fixed to the support sleeve.

7. The screw mounting structure according to claim 6, characterized in that: The locking nut is located inside the end cap.

8. The screw mounting structure according to claim 6, characterized in that: The screw mounting structure also includes a sealing ring, which is installed between the end cap and the screw.

9. The screw mounting structure according to claim 1, characterized in that: The screw mounting structure also includes a spacer sleeve, which is fitted onto the extension section and located between the second bearing and the locking nut.

10. A machine tool, characterized in that: Includes the screw mounting structure as described in any one of claims 1-9.

Images