Motor stator fixing structure of motorized spindle, motorized spindle and machine tool

Abstract

The utility model discloses a motor stator fixing structure of motorized spindle, motorized spindle and machine tool, including spindle machine body and motor stator, the spindle machine body is equipped with stator mounting hole inside, stator mounting hole extends along the axial direction, motor stator is assembled in stator mounting hole along the axial direction, the peripheral surface of motor stator fits with the inner wall surface of stator mounting hole, and the stator mounting hole extends along the axial direction. An axial mounting hole is formed between the peripheral surface of the motor stator and the inner wall surface of the stator mounting hole; and a fastener for positioning the motor stator on the main shaft machine body is arranged in the axial mounting hole. The motor stator is axially mounted in the stator mounting hole in the spindle body, and then is positioned and locked by the fastener arranged between the peripheral surface of the motor stator and the inner wall surface of the stator mounting hole, so that the detachable connection between the motor stator and the spindle body is realized, the structure is simple, the positioning is reliable, and the cost is low. The time efficiency of the assembly process can be accelerated, the silicon steel sheets and the windings can be prevented from being damaged during maintenance and disassembly, and the motorized spindle is convenient to disassemble and sort after being scrapped.

Description

Technical Field

[0001] The utility model is used in the field of electric spindles, and particularly relates to a motor stator fixing structure of an electric spindle, an electric spindle and a machine tool. Background Art

[0002] The electric spindle is the core functional component of a CNC machine tool, which contains a motor. The motor stator is fixed inside the electric spindle body, and the motor rotor is wrapped around the outside of the electric spindle shaft. When the motor is working, the motor rotor drives the shaft to rotate at high speed. Usually, the motor stator is fixed inside the electric spindle body by gluing. This fixing method has the following problems: (1) When the motor stator fails and needs to be replaced / repaired, or other parts inside the electric spindle fail and the motor stator needs to be disassembled, the disassembly process is easy to damage the motor stator. Common damage modes include deformation of silicon steel sheets and damage to windings; (2) After the electric spindle is scrapped, it is usually necessary to disassemble the parts and sort them according to the type of material. Since the motor stator is bonded to the body, disassembly and material separation are very difficult, which is not conducive to material recycling.

[0003] There are also technical solutions in the prior art for fixing the motor stator to the electric spindle body by fasteners such as bolts. This fixing method has the following problems: (1) The bolts are directly installed radially on the body and fix the motor stator. This method requires opening holes in the body (or shell). This fixing method is not suitable for electric spindles because the electric spindle body is densely covered with complex cooling water channels. The location of the opening of the holes will affect the smooth flow of cooling water, which is not conducive to the heat dissipation of the electric spindle during operation. In addition, the opening of the holes in the body is prone to oil leakage or external moisture infiltration, which affects the reliability of the electric spindle; (2) The bolts fix the motor stator to the body through the locking plate. This method has many parts and cumbersome installation. In addition, the stator positioning of the motor is prone to failure during use. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art, and provides a motor stator fixing structure of an electric spindle, an electric spindle and a machine tool.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] In a first aspect, a motor stator fixing structure of an electric spindle comprises a spindle body and a motor stator, wherein a stator mounting hole is provided inside the spindle body, the stator mounting hole extends axially, the motor stator is axially assembled in the stator mounting hole, the spindle body is sleeved on the outside of the motor stator, the outer peripheral surface of the motor stator is fitted with the inner wall surface of the stator mounting hole, an axial mounting hole is provided between the outer peripheral surface of the motor stator and the inner wall surface of the stator mounting hole, and a fastener for positioning the motor stator on the spindle body is provided in the axial mounting hole.

[0007] In combination with the first aspect, in certain implementations of the first aspect, a stator mounting seat is provided inside the spindle body at the position where the motor stator is installed, and the stator mounting hole extends axially from the first end face of the stator mounting seat to the second end face of the stator mounting seat, and a first cavity is formed inside the spindle body on one side of the first end face, and a second cavity is formed inside the spindle body on one side of the second end face.

[0008] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the stator mounting seat is provided with a limiting step at one end of the stator mounting hole, the motor stator includes a stator core, the stator core is arranged in the stator mounting hole, the first end of the stator core abuts against the limiting step, and an axial mounting hole is provided between the second end of the stator core and the inner wall surface of the stator mounting hole.

[0009] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, the second end surface of the stator core is flush with the first end surface of the stator mounting seat.

[0010] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, the axial mounting hole includes a threaded hole, and the fastener includes a fastening screw disposed in the threaded hole.

[0011] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, a portion of the threaded surface of the threaded hole is located on the outer peripheral surface of the motor stator, and another portion of the threaded surface is located on the inner wall surface of the stator mounting hole.

[0012] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, the number of the fastening screws is 2-8.

[0013] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, the fastening screws are evenly distributed along the circumferential direction at the ends of the contact surfaces between the stator core and the stator mounting seat.

[0014] In a second aspect, an electric spindle includes the motor stator fixing structure described in any implementation of the first aspect.

[0015] In a third aspect, a machine tool comprises the electric spindle described in any implementation of the second aspect.

[0016] One of the above technical solutions has at least one of the following advantages or beneficial effects: In the technical solution of the utility model, the motor stator is axially assembled in the stator mounting hole inside the spindle body, and then positioned and locked by fasteners arranged between the outer peripheral surface of the motor stator and the inner wall surface of the stator mounting hole, thereby realizing a detachable connection between the motor stator and the spindle body. The fixing structure has a simple structure and reliable positioning, which not only speeds up the time efficiency of the assembly process, but also avoids damage to the silicon steel sheets and windings during maintenance and disassembly, and is also convenient for disassembly and sorting after the electric spindle is scrapped.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic structural diagram of an embodiment of the electric spindle of the utility model;

[0020] Figure 2 yes Figure 1 A cross-sectional view of the internal structure of an embodiment shown;

[0021] Figure 3 yes Figure 1 A cross-sectional view of a motor stator fixing structure of an electric spindle in one embodiment shown;

[0022] Figure 4 yes Figure 1 A side view of a motor stator fixing structure of an electric spindle in one embodiment is shown. DETAILED DESCRIPTION

[0023] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0024] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0025] In the present utility model, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present utility model, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0026] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0027] See also Figure 1 , Figure 2 The embodiment of the utility model provides an electric spindle, comprising a spindle body 100, a motor stator 200, a motor rotor 300 and a shaft core 400. The motor stator 200 is fixed inside the spindle body 100, and the motor rotor 300 is wrapped around the outside of the spindle shaft core 400. When the motor is working, the motor rotor 300 drives the shaft core 400 to rotate at a high speed.

[0028] Among them, the electric spindle includes a motor stator fixing structure of the electric spindle, that is, an embodiment of the utility model provides a motor stator fixing structure of the electric spindle, which is used to disassemble the motor stator 200 and install it on the spindle body 100, thereby solving the problem of disassembly and material separation.

[0029] See also Figure 2 , Figure 3 , Figure 4The motor stator fixing structure of the electric spindle includes a spindle body 100 and a motor stator 200. A stator mounting hole is provided inside the spindle body 100, and the stator mounting hole extends in the axial direction. The motor stator 200 is axially assembled in the stator mounting hole. The spindle body 100 is sleeved on the outside of the motor stator 200. The outer peripheral surface of the motor stator 200 fits the inner wall surface of the stator mounting hole. An axial mounting hole is provided between the outer peripheral surface of the motor stator 200 and the inner wall surface of the stator mounting hole. A fastener 500 for positioning the motor stator 200 on the spindle body 100 is provided in the axial mounting hole. The fastener 500 includes a pin, a bolt, a screw, etc. The fastener 500 is axially installed in the axial mounting hole to realize the axial and circumferential locking positioning of the motor stator 200, so that the motor stator 200 can be stably and detachably installed in the stator mounting hole.

[0030] In the technical solution of the utility model, the motor stator 200 is axially assembled in the stator mounting hole inside the spindle body 100, and then positioned and locked by the fastener 500 arranged between the outer peripheral surface of the motor stator 200 and the inner wall surface of the stator mounting hole, so as to realize the detachable connection between the motor stator 200 and the spindle body 100. The fixing structure has a simple structure and reliable positioning, which can not only speed up the time efficiency of the assembly process, but also, because the motor stator 200 and the spindle body 100 are no longer bonded with glue, the silicon steel sheets and windings can be avoided from being damaged during maintenance and disassembly, and it is also convenient for disassembly and sorting after the electric spindle is scrapped.

[0031] In some embodiments, see Figure 2 , Figure 3 , Figure 4 A stator mounting seat 101 is provided inside the spindle body 100 at the position where the motor stator 200 is installed. The stator mounting hole extends axially from the first end face 102 of the stator mounting seat 101 to the second end face 103 of the stator mounting seat 101. A first cavity 104 is formed inside the spindle body 100 on one side of the first end face 102, and a second cavity 105 is formed inside the spindle body 100 on one side of the second end face 103. The inner diameters of the first cavity 104 and the second cavity 105 are larger than the inner diameter of the stator mounting hole. The stator mounting seat 101 forms a boss structure inside the spindle body 100. The position where the outer peripheral surface of the motor stator 200 fits with the inner wall surface of the stator mounting hole is staggered with the inner walls of the first cavity 104 and the second cavity 105, so as to facilitate the disassembly and assembly of the fastener 500 and the motor stator 200.

[0032] For further information, see Figure 2 , Figure 3The stator mounting seat 101 is provided with a limiting step 106 at one end of the stator mounting hole. The motor stator 200 includes a stator core 201 and a coil 202. The stator core 201 is arranged in the stator mounting hole. The first end of the stator core 201 abuts against the limiting step 106. An axial mounting hole is provided between the second end of the stator core 201 and the inner wall surface of the stator mounting hole. A fastener 500 is provided in the axial mounting hole, so that the motor stator 200 cannot slide out from this end. In this embodiment, when disassembling and assembling the motor stator 200, only the fastener 500 at one end needs to be disassembled and assembled. The structure is simpler and the time efficiency of the disassembly and assembly process can be accelerated. At the same time, since the inner diameter of the first cavity 104 and the second cavity 105 is larger than the inner diameter of the stator mounting hole, it is more convenient to arrange and install the coils 202 at both ends of the motor stator 200 inside the body.

[0033] In some embodiments, see Figure 2 , Figure 3 The second end surface of the stator core 201 is flush with the first end surface 102 of the stator mounting seat 101. When installing the fastener 500, the end surfaces of the stator core 201 and the stator mounting seat 101 can be used as positioning surfaces to ensure that the fastener 500 is installed in place and avoid the fastener 500 from tilting to one side, thereby improving the stability and reliability of the entire fixing structure.

[0034] In some embodiments, see Figure 2 , Figure 3 The axial mounting hole includes a threaded hole, and the fastener 500 includes a fastening screw arranged in the threaded hole. In this embodiment, the fastener 500 adopts a fastening screw, which is more convenient for disassembly and assembly, and can prevent the fastener 500 from loosening from the axial mounting hole through the thread cooperation between the thread and the threaded hole, thereby further improving the stability and reliability of the entire fixing structure.

[0035] For further information, see Figure 2 , Figure 3 , Figure 4 , a part of the threaded surface of the threaded hole is located on the outer peripheral surface of the motor stator, and another part of the threaded surface is located on the inner wall surface of the stator mounting hole. For example, in some embodiments, a part of the threaded surface of the threaded hole is located on the outer peripheral surface of the stator core 201, and another part of the threaded surface is located on the stator mounting seat 101. In other words, a part of the threaded surface of the fastening screw is threadedly matched with the stator core 201, and another part of the threaded surface of the fastening screw is threadedly matched with the stator mounting seat 101, which fully improves the axial and circumferential positioning ability of the fastening screw for the stator core 201.

[0036] In some embodiments, see Figure 4The number of fastening screws is 2-8. Multiple fastening screws can make the positioning of the stator core more stable, avoiding the failure of the entire fixing structure due to one loose screw. The fastening screws are evenly distributed along the circumference and evenly distributed on the contact surface ends of the stator core 201 and the stator mounting seat 101. This embodiment adopts a uniform arrangement layout to avoid the stator core 201 being skewed or inconvenient to disassemble due to uneven distribution of fastening screws.

[0037] An embodiment of the utility model further provides a machine tool, comprising the electric spindle of any one of the above embodiments.

[0038] In the description of this specification, the description with reference to the terms "example", "embodiment" or "some embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0039] Of course, the invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A motor stator fixing structure of an electric spindle, characterized in that: It includes a spindle body and a motor stator, wherein a stator mounting hole is provided inside the spindle body, the stator mounting hole extends axially, the motor stator is axially assembled in the stator mounting hole, the spindle body is sleeved on the outside of the motor stator, the outer circumferential surface of the motor stator is fitted with the inner wall surface of the stator mounting hole, an axial mounting hole is provided between the outer circumferential surface of the motor stator and the inner wall surface of the stator mounting hole, and a fastener for positioning the motor stator on the spindle body is provided in the axial mounting hole.

2. The motor stator fixing structure of the electric spindle according to claim 1, characterized in that: A stator mounting seat is provided inside the spindle body at the position where the motor stator is installed, and the stator mounting hole extends axially from the first end face of the stator mounting seat to the second end face of the stator mounting seat, and a first cavity is formed inside the spindle body on one side of the first end face, and a second cavity is formed inside the spindle body on one side of the second end face.

3. The motor stator fixing structure of the electric spindle according to claim 2, characterized in that: The stator mounting seat is provided with a limiting step at one end of the stator mounting hole, the motor stator includes a stator core, the stator core is arranged in the stator mounting hole, the first end of the stator core abuts against the limiting step, and an axial mounting hole is provided between the second end of the stator core and the inner wall surface of the stator mounting hole.

4. The motor stator fixing structure of the electric spindle according to claim 3, characterized in that: The second end surface of the stator core is flush with the first end surface of the stator mounting seat.

5. The motor stator fixing structure of the electric spindle according to claim 3, characterized in that: The axial mounting hole comprises a threaded hole, and the fastener comprises a fastening screw disposed in the threaded hole.

6. The motor stator fixing structure of the electric spindle according to claim 5, characterized in that: A portion of the threaded surface of the threaded hole is located on the outer peripheral surface of the motor stator, and another portion of the threaded surface is located on the inner wall surface of the stator mounting hole.

7. The motor stator fixing structure of the electric spindle according to claim 5, characterized in that: The number of the fastening screws is 2-8.

8. The motor stator fixing structure of the electric spindle according to claim 7, characterized in that: The fastening screws are evenly distributed along the circumferential direction at the ends of the contact surfaces between the stator core and the stator mounting seat.

9. An electric spindle, characterized in that: The invention comprises the motor stator fixing structure according to any one of claims 1 to 8.

10. A machine tool, characterized in that: Includes the electric spindle as claimed in claim 9.

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