High speed motorized spindle

Abstract

The utility model discloses a high -speed motorized spindle, it includes shell, stator, rotor and encoder subassembly, one end of shell is equipped with front cover, the other end of shell is equipped with medium pressure cover, and the end of medium pressure cover is equipped with back cover, and the detachable fixed connecting structure is equipped between one end of stator with medium pressure cover, and the rotatory connection is constituted to the stator with the rotor setting, the detachable connecting structure is equipped between shell and front cover, and the detachable connecting structure is equipped between shell and medium pressure cover. The utility model discloses the stator is fixed on medium pressure cover through detachable fixed connecting structure, and medium pressure cover and front cover are connected with shell through detachable connecting structure, realize the modularization connection between stator and shell, between rotor and stator, make the stator can be as an independent unit and be taken out from the cavity of shell as a whole, need not to carry out the integral replacement of shell to reduce the cost of maintenance or upgrade.

Description

Technical Field

[0001] This utility model relates to the technical field of electric spindles, and specifically to a high-speed electric spindle. Background Technology

[0002] As a core functional component of high-speed CNC machine tools, the performance and reliability of the electric spindle directly affect the machining accuracy and efficiency of the entire machine. Traditional electric spindles typically employ an integrated or low-modularity structural design, with the stator often fixed within the housing cavity via interference fit or direct casting. When internal core components such as the stator, rotor, or bearings experience wear, burnout, or performance degradation due to prolonged high-speed operation, or when stator upgrades or replacements are required, maintenance or replacement becomes exceptionally complex and expensive. Often, the entire electric spindle needs to be removed from the machine tool and sent to a specialized repair shop for disassembly, sometimes even requiring destructive methods to remove the stator. This maintenance method is not only time-consuming and severely impacts production continuity, but also often necessitates replacing the entire housing because the stator cannot be replaced separately. Furthermore, the structure of traditional electric spindles limits their flexibility for upgrades. If users wish to increase spindle power or change performance parameters, they almost always have to replace the entire electric spindle, making convenient modular upgrades on the existing housing structure impossible, thus increasing maintenance, replacement, and upgrade costs. Utility Model Content

[0003] This utility model addresses the shortcomings of current technology by providing a high-speed electric spindle, aiming to solve the technical problems of cumbersome maintenance procedures and high upgrade costs of existing high-speed electric spindles.

[0004] The technical solution adopted by this utility model to achieve the above objectives is as follows: A high-speed electric spindle includes a housing, a stator, a rotor, and an encoder assembly. One end of the housing has a front cover, the other end has a middle pressure cover, and the end of the middle pressure cover has a rear cover. The housing has an internal cavity, and the stator is disposed within the cavity. One end of the stator is detachably fixedly connected to the middle pressure cover. The rotor is disposed within the stator, forming a rotatable connection. The rotor also has a shaft, one end of which penetrates the front cover to the outside, and the other end of which penetrates the middle pressure cover. Bearing assemblies are provided between the shaft and the front cover, and between the shaft and the middle pressure cover. Detachable connection structures are also provided between the housing and the front cover, and between the housing and the middle pressure cover.

[0005] As a further improvement, the intermediate pressure cover is provided with an annular protrusion that is inserted into the cavity, the annular protrusion is provided with a limiting insertion hole, and the end wall of the stator is provided with a limiting plug that is inserted into the limiting insertion hole during assembly.

[0006] As a further improvement, the detachable fixed connection structure includes multiple threaded holes and multiple screws. The multiple threaded holes are arranged in a ring array on the end of the stator. The intermediate pressure cover is provided with a circular groove. The circular groove is provided with multiple ring arrays and countersunk holes that penetrate the circular protrusions to the outside. The screws are respectively arranged in the countersunk holes and locked with the threaded holes to fix the stator on the intermediate pressure cover.

[0007] As a further improvement, the detachable connection structure includes multiple threaded holes and multiple screws. The multiple threaded holes are arranged in a ring array on the end walls of the housing. The front cover and the middle pressure cover are both provided with countersunk holes arranged in a ring array. The screws are disposed in the countersunk holes and locked to the threaded holes to fix the front cover and the middle pressure cover to the housing, and fix the stator in the cavity. As a further improvement, both the front cover and the middle pressure cover are provided with a central hole, and each central hole is provided with a mounting cavity. The bearing assemblies are respectively disposed in the mounting cavities of the central holes, and each bearing assembly includes at least one bearing. The two ends of the shaft are respectively disposed in the bearings.

[0008] As a further improvement, the front cover is provided with a front end cover, the middle pressure cover is provided with an end cover, and both the front cover and the end cover are provided with a first annular protrusion. The first annular protrusion is inserted into the mounting cavity to restrict the bearing assembly within the mounting cavity. Screw threaded connection structures are provided between the front end cover and the front cover, and between the end cover and the middle pressure cover.

[0009] As a further improvement, a spacer is provided between the middle pressure cover and the rear cover, one end of the shaft extends into the spacer, the spacer is provided with a mounting cavity, the mounting cavity is provided with a through-hole, the encoder assembly includes an encoder and a code disk, the encoder is disposed in the mounting cavity, and the receiving surface of the encoder faces the through-hole, the code disk is fixed on one end of the shaft extending into the spacer, and the outer wall of the code disk is close to the receiving surface of the encoder.

[0010] As a further improvement, a shaft positioning groove is provided between the shaft and the code disk, one end of the shaft is inserted into the shaft positioning groove, and the code disk is connected to the shaft by screws; the shaft is also provided with a shaft through hole, a shaft rod is provided in the shaft through hole, the shaft rod is provided with a flange, one end of the shaft rod extends out of the shaft to the outside, and one end of the shaft rod is provided with a mounting thread hole.

[0011] As a further improvement, the front end cover is provided with a circular groove, and the circular groove is provided with a sealing ring.

[0012] As a further improvement, the outer shell is provided with a support, and the support is provided with a plurality of arrayed through holes.

[0013] As a further improvement, O-rings are provided between the front cover and the front end cover, between the front cover and the outer shell, between the outer shell and the middle pressure cover, and between the spacer and the middle pressure cover.

[0014] Compared with the prior art, the above-mentioned technical solutions of one or more in the high-speed electric spindle provided by the present invention have at least one of the following technical effects: 1. The stator of this utility model is fixed to the intermediate pressure cover via a detachable fixed connection structure, and the intermediate pressure cover and the front cover are connected to the outer shell via a detachable connection structure (screw and threaded hole). This modular design of "stator-intermediate pressure cover" allows the stator to be removed as an independent unit from the cavity of the outer shell. When the stator is damaged or needs to be upgraded, there is no need to damage or replace the expensive outer shell; only the stator needs to be replaced, thereby reducing maintenance or upgrade costs. By setting limiting holes on the annular protrusions of the intermediate pressure cover and corresponding limiting blocks on the end walls of the stator, rapid and accurate radial positioning can be achieved during assembly. This not only simplifies the assembly process but also ensures the coaxiality between the stator and the rotor, effectively avoiding the risk of rotor rubbing caused by assembly errors, thus ensuring the stability, reliability, and long service life of the electric spindle during high-speed operation.

[0015] 2. The front cover, outer shell, stator, rotor, and intermediate pressure cover are all connected by screws for detachable assembly, enabling modular assembly. When it is necessary to improve the spindle performance, it is convenient to replace only the stator or rotor module with a higher power without replacing the entire outer shell including the support, thus reducing the cost of subsequent upgrades. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the high-speed electric spindle in this embodiment; Figure 2 This is an exploded view of the high-speed electric spindle in this embodiment; Figure 3 This is an exploded view of the high-speed electric spindle from another angle in this embodiment; Figure 4 This is a cross-sectional schematic diagram of the high-speed electric spindle in this embodiment. Detailed Implementation

[0018] The following description is only a preferred embodiment of the present invention and does not limit the scope of protection of the present invention.

[0019] For examples, see the appendix. Figures 1-4 A high-speed electric spindle 1 includes a housing 2, a stator 3, a rotor 4, and an encoder assembly 5. One end of the housing 2 has a front cover 20, and the other end has a middle pressure cover 30. The end of the middle pressure cover 30 has a rear cover 6. The housing 2 has a cavity 21, and the stator 3 is disposed within the cavity 21. A detachable fixed connection structure 7 is provided between one end of the stator 3 and the middle pressure cover 30. The rotor 4 is disposed within the stator 3, forming a rotatable connection. The rotor 4 also has a shaft 8, one end of which passes through… The shaft 8 extends through the front cover 20 to the outside, and the other end of the shaft 8 passes through the middle pressure cover 30. Bearing assemblies 9 are provided between the shaft 8 and the front cover 20, and between the shaft 8 and the middle pressure cover 30. Detachable connection structures 10 are provided between the outer shell 2 and the front cover 20, and between the outer shell 2 and the middle pressure cover 30. The front cover 20, the middle pressure cover 30, and the detachable connection structure 10 are used to detachably connect the outer shell 2, the stator 3, and the rotor 4, thereby facilitating the replacement of individual components, improving the convenience of maintenance or application, and reducing costs.

[0020] The intermediate pressure cover 30 is provided with an annular protrusion 300 that is inserted into the cavity 21. The annular protrusion 300 is provided with a limiting insertion hole 301. The end wall of the stator 3 is provided with a limiting plug 31 that is inserted into the limiting insertion hole 301 during assembly. The limiting insertion hole 301 and the limiting plug 31 are used for positioning, thereby ensuring the position of the stator 3, and thus ensuring the efficiency and effect of the subsequent rotation of the rotor 4.

[0021] The detachable fixed connection structure 7 includes multiple threaded holes 70 and multiple screws 71. The multiple threaded holes 70 are arranged in a ring array on the end of the stator 3. The intermediate pressure cover 30 is provided with a circular groove 302. The circular groove 302 is provided with multiple ring arrays and countersunk holes 302a that penetrate the circular protrusions 300 to the outside. The screws 71 are respectively disposed in the countersunk holes 302a and locked with the threaded holes 70 to fix the stator 3 on the intermediate pressure cover 30. This allows the stator 3 to be fixed in the cavity 21 without being fixed, which facilitates subsequent disassembly and replacement. It also eliminates the need to replace the entire outer shell 2, reducing costs.

[0022] The detachable connection structure 10 includes multiple threaded holes 100 and multiple screws 101. The multiple threaded holes 100 are arranged in a ring array on the end walls of the outer casing 2. The front cover 20 and the middle pressure cover 30 are both provided with countersunk holes 11 arranged in a ring array. The screws 101 are disposed in the countersunk holes 11 and locked to the threaded holes 100 to fix the front cover 20 and the middle pressure cover 30 to the outer casing 2, and fix the stator 3 in the cavity 21. The detachable connection structure 10 makes the stator 3 and the outer casing 2 detachably connected, so that subsequent maintenance, replacement or upgrades do not require the entire outer casing 2 to be disassembled, only the stator 3 needs to be maintained or replaced, thus reducing the cost of maintenance, replacement or upgrades. Both the front cover 20 and the middle pressure cover 30 are provided with a central hole 13, and each central hole 13 is provided with a mounting cavity 130. The bearing assembly 9 is respectively disposed in the mounting cavity 130 of the central hole 13. The bearing assembly 9 includes at least one bearing. The two ends of the shaft 8 are respectively disposed in the bearing, and the two ends of the shaft 8 are respectively fixed in the rotating inner ring of the bearing. The bearing assembly 9 is used to ensure the stability of the rotor 4 when it moves.

[0023] The front cover 20 is provided with a front end cover 12, and a spacer ring 121 is provided between the front end cover 12 and the front cover 20. The spacer ring 121 is used to press the bearing. The middle pressure cover 30 is provided with an end cover 303. Both the front cover 20 and the end cover 303 are provided with a first annular protrusion 14. The first annular protrusion 14 is inserted into the mounting cavity 130 to restrict the bearing assembly 9 within the mounting cavity 130. There are screw threaded connection structures between the front end cover 12 and the front cover 20, and between the end cover 303 and the middle pressure cover 30. The screw threaded connection structures are composed of multiple screws and threaded holes. The screw threaded connection structures are used to make the end cover 303 and the middle pressure cover 30 detachably connected, which facilitates the maintenance and replacement of the internal stator 3 and rotor 4. The front cover 20 and the end cover 303 are used to set the shaft 8 inside the stator 3.

[0024] A spacer sleeve 15 is provided between the middle pressure cover 30 and the rear cover 6. The middle pressure cover 30 and the spacer sleeve 15, and the spacer sleeve 15 and the rear cover 6 are detachably connected by screw thread holes. One end of the shaft 8 extends into the spacer sleeve 15. The spacer sleeve 15 is provided with a mounting cavity 150. The mounting cavity 150 is provided with a through-hole that extends into the spacer sleeve 15. The encoder assembly 5 includes an encoder 50 and a code disk 51. The encoder 50 is disposed in the mounting cavity 150, and the receiving surface of the encoder 50 faces the through-hole. The code disk 51 is fixed on one end of the shaft 8 that extends into the spacer sleeve 15, and the outer wall of the code disk 51 is close to the receiving surface of the encoder 50. A shaft positioning groove is provided between the shaft 8 and the code disk 51. One end of the shaft 8 is inserted into the shaft positioning groove, and the code disk 51 is connected to the shaft 8 by screws. The shaft 8 is also provided with a shaft through hole, and a shaft rod 80 is provided in the shaft through hole. The shaft rod 80 is provided with a flange, and one end of the shaft rod 80 extends out of the shaft 8 to the outside. One end of the shaft rod 80 is provided with a mounting thread hole. The encoder 50 assembly 5 is used for speed and position detection feedback.

[0025] The front cover 12 is provided with a circular groove, and the circular groove is provided with a sealing ring 120, which is used for connection and sealing.

[0026] The outer casing 2 is provided with a support, and the support has a plurality of arrayed through holes 2. The support is used for placement and support during the installation of the high-speed electric spindle 1, and the through holes 2 are used for the insertion and locking of screws 71.

[0027] O-rings 16 are provided between the front cover 20 and the front end cover 12, between the front cover 20 and the outer shell 2, between the outer shell 2 and the middle pressure cover 30, and between the spacer 15 and the middle pressure cover 30. The O-rings 16 are used to ensure the sealing of the connection between the front cover 20 and the spacer 12, between the spacer 12 and the outer shell 2, between the outer shell 2 and the middle pressure cover 30, and between the spacer 15 and the middle pressure cover 30, so as to ensure the sealing effect. The outer shell 2 is preferably made of a metal heat dissipation material.

[0028] The stator of this invention is fixed to the intermediate pressure cover via a detachable fixed connection structure (screws and threaded holes), and the intermediate pressure cover and the front cover are connected to the outer casing via a detachable connection structure (screws and threaded holes). This modular "stator-intermediate pressure cover" design allows the stator to be removed as a single unit from the cavity of the outer casing. When the stator is damaged or needs upgrading, there is no need to damage or replace the expensive outer casing; only the stator needs to be replaced, thereby reducing maintenance or upgrade costs. By setting limiting holes on the annular protrusions of the intermediate pressure cover and corresponding limiting blocks on the stator end walls, rapid and precise radial positioning can be achieved during assembly. This not only simplifies the assembly process but also ensures the coaxiality between the stator and rotor, effectively avoiding the risk of rotor rubbing due to assembly errors, thus guaranteeing the stability, reliability, and long lifespan of the electric spindle during high-speed operation. The front cover, outer shell, stator, rotor, and intermediate pressure cover are all connected by screws in a detachable manner, enabling modular assembly. When it is necessary to improve the spindle performance, it is convenient to replace only the stator or rotor module with a higher power version, without having to replace the entire outer shell including the support, thus reducing the cost of subsequent upgrades.

[0029] This utility model is not limited to the above-described embodiments. Other high-speed electric spindles obtained by using the same or similar structures or devices as the above-described embodiments of this utility model are all within the protection scope of this utility model.

Claims

1. A high-speed electric spindle, characterized in that: The high-speed electric spindle includes a housing, a stator, a rotor, and an encoder assembly. One end of the housing has a front cover, the other end has a middle pressure cover, and the end of the middle pressure cover has a rear cover. The housing has an internal cavity, and the stator is disposed within the cavity. One end of the stator is detachably fixedly connected to the middle pressure cover. The rotor is disposed within the stator, forming a rotatable connection. The rotor also has a shaft, one end of which penetrates the front cover to the outside, and the other end of which penetrates the middle pressure cover. Bearing assemblies are provided between the shaft and the front cover, and between the shaft and the middle pressure cover. Detachable connection structures are also provided between the housing and the front cover, and between the housing and the middle pressure cover.

2. The high-speed electric spindle according to claim 1, characterized in that: The intermediate pressure cover is provided with an annular protrusion that is inserted into the cavity, and the annular protrusion is provided with a limiting insertion hole. The end wall of the stator is provided with a limiting insert that is inserted into the limiting insertion hole during assembly. The detachable fixed connection structure includes multiple threaded holes and multiple screws. The multiple threaded holes are arranged in a ring array on the end of the stator. The intermediate pressure cover has a circular groove. The circular groove has multiple ring arrays and a countersunk hole that extends through the circular protrusion to the outside. The screws are respectively arranged in the countersunk hole and locked to the threaded hole to fix the stator on the intermediate pressure cover.

3. The high-speed electric spindle according to claim 2, characterized in that: The detachable connection structure includes multiple threaded holes and multiple screws. The multiple threaded holes are arranged in a ring array on the end walls of the housing. The front cover and the middle pressure cover are both provided with countersunk holes arranged in a ring array. The screws are disposed in the countersunk holes and locked to the threaded holes to fix the front cover and the middle pressure cover to the housing, and fix the stator in the cavity.

4. The high-speed electric spindle according to claim 3, characterized in that: Both the front cover and the middle pressure cover are provided with a central hole, and each central hole is provided with a mounting cavity. The bearing assemblies are respectively disposed in the mounting cavities of the central holes. Each bearing assembly includes at least one bearing, and the two ends of the shaft are respectively disposed in the bearings.

5. The high-speed electric spindle according to claim 4, characterized in that: The front cover is provided with a front end cover, and the middle pressure cover is provided with an end cover. Both the front cover and the end cover are provided with a first annular protrusion. The first annular protrusion is inserted into the mounting cavity to restrict the bearing assembly within the mounting cavity. Screw threaded connection structures are provided between the front end cover and the front cover, and between the end cover and the middle pressure cover.

6. The high-speed electric spindle according to claim 5, characterized in that: A spacer is provided between the middle pressure cover and the rear cover. One end of the shaft extends into the spacer. The spacer has a mounting cavity and a through-hole. The encoder assembly includes an encoder and a code disk. The encoder is disposed in the mounting cavity and the receiving surface of the encoder faces the through-hole. The code disk is fixed on one end of the shaft extending into the spacer, and the outer wall of the code disk is close to the receiving surface of the encoder.

7. The high-speed electric spindle according to claim 6, characterized in that: A shaft positioning groove is provided between the shaft and the code disk. One end of the shaft is inserted into the shaft positioning groove, and the code disk is connected to the shaft by screws. The shaft is also provided with a shaft through hole, a shaft rod is provided in the shaft through hole, the shaft rod is provided with a flange, one end of the shaft rod extends out of the shaft to the outside, and one end of the shaft rod is provided with a mounting thread hole.

8. The high-speed electric spindle according to claim 7, characterized in that: The front end cover is provided with a circular groove, and the circular groove is provided with a sealing ring.

9. The high-speed electric spindle according to claim 8, characterized in that: The outer shell is provided with a support, and the support is provided with a plurality of arrayed through holes.

10. The high-speed electric spindle according to claim 9, characterized in that: O-rings are provided between the front cover and the front end cover, between the front cover and the outer shell, between the outer shell and the middle pressure cover, and between the spacer and the middle pressure cover.

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