Spindle spacer concentricity calibration tool

Abstract

The utility model relates to numerical control machine tool main shaft technical field, concretely relates to a kind of main shaft spacer ring concentric calibration tool, the outside wall of main shaft is sleeved with bearing spacer ring assembly, bearing spacer ring assembly includes N spacer rings and N+1 bearings sequentially spaced sleeve in the outside wall of main shaft, the bottom of main shaft corresponding bearing spacer ring assembly is fixed with fixed ring, the top of main shaft corresponding bearing spacer ring assembly is screwed with lock nut, the calibration tool includes annular sleeve and the annular top seat fixed in annular sleeve top, the inside wall of annular sleeve is matched with the outside wall of multiple spacer rings, the inside diameter of annular top seat is greater than the outside diameter of lock nut, the inside diameter of annular top seat is less than the inside diameter of annular sleeve, the outside diameter of annular top seat is greater than the outside diameter of annular sleeve.The main shaft spacer ring concentric calibration tool of the utility model can ensure that all spacer rings maintain coaxial when lock nut is pressed, avoid the uneven bearing pre-tightening force caused by deflection, and the setting of annular top seat facilitates assembly and disassembly, and the structure is simple.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tool spindle technology, specifically to a spindle spacer ring concentric calibration fixture. Background Technology

[0002] An electric spindle is a new technology that integrates the machine tool spindle and its motor. The spindle is directly driven by a built-in motor, eliminating the gear, belt, or coupling transmission devices of traditional spindles, thus reducing the transmission chain length of the machine tool spindle to zero. Electric spindles are characterized by their compact structure, light weight, low inertia, low vibration, low noise, and fast response speed, and are widely used in the manufacturing of precision molds, automobiles, ships, aerospace, and other cutting-edge products. However, electric spindles have a complex structure and require high precision in parts and advanced assembly techniques.

[0003] Bearings are essential components for shaft-type parts, and spacers are typically used for bearing positioning. In existing electric spindle structures, the outer ring of the bearing is usually mounted in a bearing housing, the inner ring is mounted on the outer diameter of the spindle core, and the spacer is installed between two bearings. Chinese utility model patent application number 202121877160.6 discloses a bearing spacer assembly, including an outer spacer ring, an inner spacer ring, and an inner ring slider. The outer spacer ring is located on both sides of the inner spacer ring and overlaps its outer surface. The inner ring slider is located on both sides of the inner spacer ring and is situated inside the outer and inner spacer rings. A cooling structure is provided on the outer spacer ring for cooling the bearing. The inner spacer ring is telescopic, and the radial pressure applied to it by the cooling structure is converted into axial pressure applied to the inner ring slider to preload the bearing. This bearing spacer assembly not only provides precise cooling for the bearing, improving cooling efficiency, but also preloads the bearing. Existing bearing spacer assemblies involve alternately mounting multiple bearings and spacers onto the spindle. During installation, it is necessary to ensure that the spacers are concentric with the spindle before locking with lock nuts. However, the concentricity of existing spacers cannot be controlled during installation, and they need to be repeatedly tapped with rubber rings for adjustment after installation. Summary of the Invention

[0004] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide a concentric calibration fixture for the spindle spacer ring.

[0005] The objective of this utility model is achieved through the following technical solution: a concentric calibration fixture for a spindle spacers, wherein a bearing spacer assembly is sleeved on the outer wall of the spindle, the bearing spacer assembly includes N spacers and N+1 bearings that are sequentially and spaced apart on the outer wall of the spindle, where N is a positive integer from 2 to 6, the outer diameter of each spacer is the same as the outer diameter of each bearing, a fixing ring is fixed at the bottom of the bearing spacer assembly corresponding to the spindle, and a locking nut is screwed to the top of the bearing spacer assembly corresponding to the spindle. The calibration fixture includes an annular sleeve and an annular top seat fixed to the top of the annular sleeve, the inner wall of the annular sleeve mates with the outer walls of the multiple spacers, the inner diameter of the annular top seat is larger than the outer diameter of the locking nut, the inner diameter of the annular top seat is smaller than the inner diameter of the annular sleeve, and the outer diameter of the annular top seat is larger than the outer diameter of the annular sleeve.

[0006] Furthermore, the bearing includes an outer ring, an inner ring sleeved inside the outer ring, and a plurality of balls sandwiched between the outer ring and the inner ring. The spacer includes an outer spacer and an inner spacer rotatably connected to the inner side of the outer spacer. The upper and lower ends of the inner spacer abut against the inner rings of two adjacent bearings, and the upper and lower ends of the outer spacer abut against the outer rings of two adjacent bearings.

[0007] Furthermore, the outer spacer ring has a first annular groove on its top inner edge, and a first annular boss protrudes upward from the inner edge of the first annular groove. The inner spacer ring has an annular protrusion protruding outward from its top outer edge, and the bottom of the annular protrusion is rotatably connected to the top of the first annular boss.

[0008] Furthermore, a second annular groove is provided on the inner edge of the bottom of the outer spacer ring.

[0009] Furthermore, the number of spacer rings is three, with the upper spacer ring having the same width as the lower spacer ring, and the middle spacer ring having a wider width than the upper and lower spacer rings.

[0010] Furthermore, the number of bearings is four, with the top of the retaining ring abutting against the bottom of the inner ring of the lowest bearing, and the bottom of the locking nut abutting against the top of the inner ring of the highest bearing.

[0011] Furthermore, the fixing ring includes a cylindrical fixing ring and a frustum-shaped fixing ring coaxially fixed to the top of the cylindrical fixing ring. The bottom of the frustum-shaped fixing ring and the top of the cylindrical fixing ring are provided with an annular rounded corner. The top of the frustum-shaped fixing ring abuts against the bottom of the inner ring of the lowest bearing.

[0012] Furthermore, an annular base is coaxially fixed to the bottom of the locking nut, and the bottom of the annular base abuts against the top of the inner ring of the uppermost bearing.

[0013] Furthermore, the retaining ring is integrally formed with the main shaft.

[0014] Furthermore, the bottom inner edge of the annular sleeve is provided with an annular chamfer.

[0015] The beneficial effects of this utility model are as follows: The concentric alignment fixture for the spindle spacer ring of this utility model achieves a precise fit between the annular sleeve and the outer wall of the spacer ring. The spacer ring has the same outer diameter as the bearing. The fixture can simultaneously constrain the spacer ring and the outer ring of the bearing, ensuring that the overall assembly is concentric. The fixing ring and the locking nut form an axial clamp. The fixture only needs to solve the radial alignment problem and does not need to bear the axial locking force. This ensures that all spacer rings remain coaxial when the locking nut is applied, avoiding uneven bearing preload caused by misalignment. Furthermore, the annular top seat facilitates assembly and disassembly. The structure is simple and easy to use. Attached Figure Description

[0016] Figure 1 This is a perspective view of the spindle and the bearing spacer assembly described in this utility model.

[0017] Figure 2 This is a perspective view of the spindle, bearing spacer assembly, and calibration fixture described in this utility model.

[0018] Figure 3 This is an exploded perspective view of the spindle, bearing spacer assembly, and calibration fixture described in this utility model.

[0019] Figure 4 This is a cross-sectional view of the spindle, bearing spacer assembly, and calibration fixture described in this utility model.

[0020] Figure 5 This is a cross-sectional view of the spacer ring described in this utility model.

[0021] Figure 6 This is an exploded perspective view of the spacer ring described in this utility model.

[0022] The attached figures are labeled as follows: spindle 1, bearing spacer assembly 2, spacer 21, outer spacer 211, inner spacer 212, first annular side groove 213, first annular boss 214, annular protrusion 215, second annular side groove 216, second annular boss 217, bearing 22, outer ring 221, inner ring 222, several balls 223, retaining ring 3, cylindrical retaining ring 31, frustum-shaped retaining ring 32, annular fillet 33, locking nut 4, annular base 41, calibration fixture 5, annular sleeve 51, annular top seat 52, annular chamfer 53. Detailed Implementation

[0023] To facilitate understanding by those skilled in the art, the following description is provided in conjunction with embodiments and appendices. Figure 1-6 The present invention will be further described below. The content mentioned in the embodiments is not intended to limit the present invention.

[0024] See Figure 1-6A spindle spacer concentric calibration fixture is provided. A bearing spacer assembly 2 is sleeved on the outer wall of the spindle 1. The bearing spacer assembly 2 includes N spacers 21 and N+1 bearings 22 that are sequentially and spaced on the outer wall of the spindle 1. N is a positive integer from 2 to 6. The outer diameter of each spacer 21 is the same as the outer diameter of each bearing 22. A fixing ring 3 is fixed to the bottom of the spindle 1 corresponding to the bearing spacer assembly 2. A locking nut 4 is screwed to the top of the spindle 1 corresponding to the bearing spacer assembly 2. The calibration fixture 5 includes an annular sleeve 51 and an annular top seat 52 fixed to the top of the annular sleeve 51. The inner wall of the annular sleeve 51 cooperates with the outer wall of the multiple spacers 21. The inner diameter of the annular top seat 52 is larger than the outer diameter of the locking nut 4. The inner diameter of the annular top seat 52 is smaller than the inner diameter of the annular sleeve 51. The outer diameter of the annular top seat 52 is larger than the outer diameter of the annular sleeve 51. The inner diameter of the annular top seat 52 is larger than the outer diameter of the locking nut 4 to avoid interfering with the rotation operation of the locking nut 4. The inner diameter of the annular top seat 52 is smaller than the inner diameter of the annular sleeve 51, forming a stepped surface to facilitate the placement of the calibration fixture 5. The outer diameter of the annular top seat 52 is larger than the outer diameter of the annular sleeve 51 to facilitate the removal of the calibration fixture 5.

[0025] The main shaft spacer ring concentric calibration fixture 5 of this utility model achieves a precise fit between the annular sleeve 51 and the outer wall of the spacer ring 21. The outer diameter of the spacer ring 21 is the same as that of the bearing 22. The fixture can simultaneously constrain the outer rings of the spacer ring 21 and the bearing 22, ensuring that the overall assembly is concentric. The fixing ring 3 and the locking nut 4 form an axial clamp. The fixture only needs to solve the radial alignment problem and does not need to bear the axial locking force, ensuring that all spacer rings 21 remain coaxial when the locking nut 4 applies pressure, avoiding uneven preload of the bearing 22 caused by misalignment. In addition, the setting of the annular top seat 52 facilitates assembly and disassembly. The structure is simple and easy to use.

[0026] In this embodiment, the bearing 22 includes an outer ring 221, an inner ring 222 sleeved inside the outer ring 221, and a plurality of balls 223 sandwiched between the outer ring 221 and the inner ring 222. The spacer 21 includes an outer spacer 211 and an inner spacer 212 rotatably connected to the inner side of the outer spacer 211. The upper and lower ends of the inner spacer 212 abut against the inner rings 222 of two adjacent bearings 22, and the upper and lower ends of the outer spacer 211 abut against the outer rings 221 of two adjacent bearings 22. The above structure facilitates the rotation of the spindle 1.

[0027] In this embodiment, the outer spacer ring 211 has a first annular groove 213 on its top inner edge, and a first annular boss 214 protrudes upward from the inner edge of the first annular groove 213. The inner spacer ring 212 has an annular protrusion 215 protruding outward from its top outer edge, and the bottom of the annular protrusion 215 is rotatably connected to the top of the first annular boss 214. This structure facilitates the assembly of the spacer ring 21. Additionally, the outer spacer ring 211 has a second annular groove 216 on its bottom inner edge. For spacer rings 21 with a larger width, such as the spacer ring 21 in the middle of this embodiment, a second annular boss 217 protrudes downward from the bottom outer edge of the second annular groove 216.

[0028] In this embodiment, there are three spacer rings 21. The upper spacer ring 21 has the same width as the lower spacer ring 21, and the middle spacer ring 21 has a wider width than the upper and lower spacer rings 21. This structure facilitates the positioning of the bearing 22.

[0029] In this embodiment, there are four bearings 22. The top of the retaining ring 3 abuts against the bottom of the inner ring 222 of the lowest bearing 22, and the bottom of the locking nut 4 abuts against the top of the inner ring 222 of the uppermost bearing 22. The above structure can improve the rotational performance of the spindle 1.

[0030] In this embodiment, the fixing ring 3 includes a cylindrical fixing ring 31 and a frustum-shaped fixing ring 32 coaxially fixed to the top of the cylindrical fixing ring 31. The bottom of the frustum-shaped fixing ring 32 has an annular fillet 33 at the connection point with the top of the cylindrical fixing ring 31. The top of the frustum-shaped fixing ring 32 abuts against the bottom of the inner ring 222 of the lowest bearing 22. This structure facilitates axial clamping between the fixing ring 3 and the locking nut 4.

[0031] In this embodiment, an annular base 41 is coaxially fixed to the bottom of the locking nut 4, and the bottom of the annular base 41 abuts against the top of the inner ring 222 of the uppermost bearing 22. The above structure facilitates the axial clamping of the fixing ring 3 and the locking nut 4.

[0032] In this embodiment, the fixing ring 3 is integrally formed with the main shaft 1. The above structure can improve the support strength of the fixing ring 3 and prevent loosening.

[0033] In this embodiment, the bottom inner edge of the annular sleeve 51 is provided with an annular chamfer 53. The annular chamfer 53 facilitates the fitting of the annular sleeve 51 onto the outer wall of the bearing 22 or the spacer ring 21.

[0034] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this utility model are within the protection scope of this utility model.

Claims

1. A spindle spacer concentric calibration fixture, wherein a bearing spacer assembly is sleeved on the outer wall of the spindle, the bearing spacer assembly comprising N spacers and N+1 bearings sequentially and spaced apart on the outer wall of the spindle, where N is a positive integer from 2 to 6, the outer diameter of each spacer is the same as the outer diameter of each bearing, a fixing ring is fixed to the bottom of the bearing spacer assembly corresponding to the spindle, and a locking nut is screwed to the top of the bearing spacer assembly corresponding to the spindle, characterized in that: The calibration fixture includes an annular sleeve and an annular top seat fixed to the top of the annular sleeve. The inner wall of the annular sleeve mates with the outer walls of multiple spacers. The inner diameter of the annular top seat is larger than the outer diameter of the locking nut, the inner diameter of the annular top seat is smaller than the inner diameter of the annular sleeve, and the outer diameter of the annular top seat is larger than the outer diameter of the annular sleeve.

2. The spindle spacer concentric calibration fixture according to claim 1, characterized in that: The bearing includes an outer ring, an inner ring sleeved inside the outer ring, and a plurality of balls sandwiched between the outer ring and the inner ring. The spacer includes an outer spacer and an inner spacer rotatably connected to the inner side of the outer spacer. The upper and lower ends of the inner spacer abut against the inner rings of two adjacent bearings, and the upper and lower ends of the outer spacer abut against the outer rings of two adjacent bearings.

3. The spindle spacer concentric calibration fixture according to claim 2, characterized in that: The outer spacer ring has a first annular groove on its top inner edge, and a first annular boss protrudes upward from the inner edge of the first annular groove. The inner spacer ring has an annular protrusion protruding outward from its top outer edge, and the bottom of the annular protrusion is rotatably connected to the top of the first annular boss.

4. The spindle spacer concentric calibration fixture according to claim 2, characterized in that: The bottom inner edge of the outer spacer ring is provided with a second annular side groove.

5. The spindle spacer concentric calibration fixture according to claim 1, characterized in that: The number of spacers is three, with the upper spacer having the same width as the lower spacer, and the middle spacer having a wider width than the upper and lower spacers.

6. The spindle spacer concentric calibration fixture according to claim 2, characterized in that: The number of bearings is four, the top of the retaining ring abuts against the bottom of the inner ring of the lowest bearing, and the bottom of the locking nut abuts against the top of the inner ring of the highest bearing.

7. The spindle spacer concentric calibration fixture according to claim 2, characterized in that: The fixing ring includes a cylindrical fixing ring and a frustum-shaped fixing ring coaxially fixed to the top of the cylindrical fixing ring. The bottom of the frustum-shaped fixing ring and the top of the cylindrical fixing ring are provided with an annular rounded corner. The top of the frustum-shaped fixing ring abuts against the bottom of the inner ring of the lowest bearing.

8. The spindle spacer concentric calibration fixture according to claim 1, characterized in that: The bottom of the locking nut is coaxially fixed with an annular base, and the bottom of the annular base abuts against the top of the inner ring of the uppermost bearing.

9. The spindle spacer concentric calibration fixture according to claim 1, characterized in that: The retaining ring is integrally formed with the main shaft.

10. The spindle spacer concentric calibration fixture according to claim 1, characterized in that: The bottom inner edge of the annular sleeve is provided with an annular chamfer.

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