Electric spindle capable of reducing temperature of spindle body

Abstract

The utility model provides an electric main shaft capable of reducing the temperature of a main shaft body. The electric main shaft comprises the main shaft body and a motor rotor which is sleeved on the main shaft body and is used for driving the main shaft body to rotate, the spiral shaft sleeve is arranged between the main shaft body and the motor rotor and is used for transmitting the torque of the motor rotor to the main shaft body; the spiral shaft sleeve comprises a first shaft sleeve wall used for being arranged on the shaft body in a sleeving mode, a second shaft sleeve wall used for being arranged on the motor rotor in a sleeving mode, and a plurality of spiral grooves formed between the first shaft sleeve wall and the second shaft sleeve wall. Through the arrangement of the spiral groove in the spiral shaft sleeve, heat of a motor rotor can be prevented from being transmitted to the main shaft body, so that the temperature of the main shaft body is effectively reduced, and through the spiral groove formed in the spiral shaft sleeve, axial circulation of air in the spiral groove is promoted in the working process of the electric main shaft; heat accumulation around the motor rotor is avoided, and the temperature of the main shaft body is further reduced.

Description

Technical Field

[0001] This utility model relates to the field of mechanical manufacturing equipment technology, and more specifically, to an electric spindle that can reduce the temperature of the spindle body. Background Technology

[0002] An electric spindle is a device that integrates a motor and a spindle, and it is widely used in modern machine tools. The motor in an electric spindle is typically an AC asynchronous induction motor. This design gives electric spindles advantages such as compact structure, light weight, low inertia, low noise, and fast response.

[0003] This is precisely why commonly used electric spindles, with their compact internal structure and close fit between the spindle body and the motor rotor, experience high internal temperatures and accumulate significant heat during operation. This leads to high vibration and thermal displacement, affecting machining accuracy and limiting the improvement of machining quality. Therefore, the current challenge is to effectively reduce spindle temperature while maintaining spindle rigidity, improving spindle vibration, enhancing machining accuracy and stability, and achieving lightweight design. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide an electric spindle that can reduce the temperature of the spindle body, so as to solve the above problems.

[0005] The present invention adopts the following solution:

[0006] This application provides an electric spindle capable of reducing spindle body temperature, including a spindle body and a motor rotor sleeved on the spindle body for driving its rotation; it also includes a helical bushing disposed between the spindle body and the motor rotor for transmitting the torque of the motor rotor to the spindle body; the helical bushing includes a first bushing wall for sleeved on the spindle body, a second bushing wall for sleeved on the motor rotor, and a plurality of helical grooves disposed between the first bushing wall and the second bushing wall.

[0007] Furthermore, the number of spiral turns between the two ends of the spiral axis does not exceed one turn.

[0008] Furthermore, a shoulder is provided on one side of the main shaft, and at least one limiting member is provided on the other side; the spiral bushing is disposed between the shoulder and the limiting member.

[0009] Furthermore, it includes two limiting members with internal threads, and the threads of the internal threads are opposite in direction; on the other side of the main shaft body, there are two compatible and adjacent external threads.

[0010] Furthermore, the inner diameter of the second limiting member farther from the shoulder is smaller than the inner diameter of the first limiting member closer to the shoulder.

[0011] Furthermore, the outer side of the shoulder is provided with a first mounting surface that mates with the first bearing; the outer side of the external thread is provided with a second mounting surface that mates with the second bearing.

[0012] Furthermore, a tool holder for connecting a cutting tool is provided at one end of the electric spindle near the shoulder.

[0013] Furthermore, the first bushing wall and the electric spindle, as well as the second bushing wall and the motor rotor, are connected by an interference fit.

[0014] Furthermore, the motor rotor is covered by a carbon fiber shell and attached to the wall of the second bushing.

[0015] Furthermore, the spiral bushing is made of titanium alloy.

[0016] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0017] This invention provides an electric spindle that can reduce the temperature of the spindle body, including a spindle body and a motor rotor sleeved on the spindle body for driving its rotation; it also includes a helical sleeve disposed between the spindle body and the motor rotor for transmitting the torque of the motor rotor to the spindle body; the helical groove on the helical sleeve not only prevents the heat of the motor rotor from being transferred to the spindle body, thus effectively reducing the temperature of the spindle body, but also promotes axial airflow within the helical groove during the operation of the electric spindle, preventing heat accumulation around the motor rotor and further reducing the temperature of the spindle body. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an electric spindle that can reduce the temperature of the spindle body according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the spindle structure of an electric spindle that can reduce the spindle temperature according to an embodiment of the present invention.

[0021] Figure 3This is a schematic diagram of a spiral bushing structure for an electric spindle that can reduce the temperature of the spindle body, according to an embodiment of the present invention.

[0022] Figure 4 This is a cross-sectional view of the spiral bushing of an electric spindle that can reduce the temperature of the spindle body according to an embodiment of the present invention, with the second bushing wall removed.

[0023] Icons: Main spindle 1, spiral bushing 2, motor rotor 3, first limiting component 4, second limiting component 5, tool holder 6, pull rod 7, first mounting surface 101, second mounting surface 102, shaft shoulder 103, first external thread 104, second external thread 105, spiral wall 201, spiral groove 202. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] Example

[0026] Combination Figures 1 to 4 As shown, this embodiment provides an electric spindle that can reduce the temperature of the spindle body 1, including the spindle body 1 and a motor rotor 3 sleeved on the spindle body 1 for driving its rotation; it also includes a helical bushing 2 disposed between the spindle body 1 and the motor rotor 3, which is used to transmit the torque of the motor rotor 3 to the spindle body 1; the helical bushing 2 includes a first bushing wall for sleeved on the spindle body, a second bushing wall for the motor rotor 3 to be sleeved, and a plurality of helical grooves 202 disposed between the first bushing wall and the second bushing wall.

[0027] In this embodiment, as Figure 2As shown, the spindle body 1 has a shoulder 103 on one side and two adjacent first external threads 104 and second external threads 105 on the other side. A first limiting member 4 and a second limiting member 5, adapted to the external threads, are screwed onto the external threads. The spiral sleeve 2 is interference-fitted onto the spindle body 1 and positioned between the shoulder 103 and the limiting members. The shoulder 103 and the limiting members restrict the axial displacement of the spiral sleeve 2 to ensure machining quality. Specifically, the threads of the two limiting members are arranged in opposite directions, and similarly, the threads of the two external threads on the electric spindle are arranged in opposite directions to ensure proper fit. The opposing thread directions are used to limit the axial displacement of the helical groove 202 bushing by the friction between the two limiting members, thereby improving the stability of the fit between the structural components. Furthermore, the inner diameter of the second limiting member 5, which is farther from the shoulder 103, is smaller than the inner diameter of the first limiting member 4, which is closer to the shoulder 103. This facilitates the sequential screwing in of the first limiting member 4 and the second limiting member 5, so as to avoid the first limiting member 4 being blocked by the external thread on the main shaft 1, which has the opposite thread direction to the internal thread of the first limiting member 4.

[0028] In this embodiment, the outer side of the shoulder 103 is provided with a first mounting surface 101 that mates with the first bearing; the outer side of the external thread is provided with a second mounting surface 102 that mates with the second bearing. The first mounting surface 101 is press-fitted with the first bearing, and the second mounting surface 102 is press-fitted with the second bearing. A tool holder 6 for connecting a cutting tool is provided at one end of the electric spindle near the shoulder 103.

[0029] In this embodiment, as Figure 3 and Figure 4 As shown, the first bushing wall and the electric spindle, as well as the second bushing wall and the motor rotor 3, are connected by an interference fit. Multiple spiral walls 201 are provided between the first bushing wall and the second bushing wall, and a spiral groove 202 is formed between two adjacent spiral walls 201. The spiral groove 202 has no more than one spiral turn between its two ends along the spiral axis, so that air can circulate more smoothly within the spiral groove 202 when the spiral bushing 2 rotates.

[0030] In this embodiment, the two ends of the second bushing wall are provided with outwardly protruding limiting walls, and a circumferential mounting groove is formed between the two limiting walls. The motor rotor 3 is covered by a carbon fiber shell and mounted on the mounting groove. The spiral groove 202 on the spiral bushing 2 not only prevents the heat of the motor rotor 3 from being transferred to the spindle body 1, thus effectively reducing the temperature of the spindle body 1, but also promotes axial airflow within the spiral groove 202 during the operation of the electric spindle, preventing heat accumulation around the motor rotor 3 and further reducing the temperature of the spindle body 1.

[0031] The spiral bushing 2 is made of a material with high strength, low density, and low thermal conductivity. Preferably, the spiral bushing 2 is made of titanium alloy, whose high-temperature stability and ease of machining make the spiral bushing 2 easy to promote and apply. Titanium alloy material can effectively reduce the weight of the electric spindle motor rotor 3, effectively optimize the vibration of the spindle motor rotor 3, and has higher machining accuracy, which helps to achieve lightweighting and excellent vibration performance of the electric spindle.

[0032] It should be noted that the electric spindle also includes a stator fixed to the outer periphery of the motor rotor 3, and a tie rod 7 disposed in the spindle body 1. These are well-known core components of the electric spindle and will not be described in detail here.

[0033] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions that fall within the scope of this utility model's concept are protected by this utility model.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. An electric spindle capable of reducing spindle body temperature, comprising a spindle body and a motor rotor sleeved on the spindle body for driving its rotation; characterized in that, It also includes a helical bushing disposed between the main shaft and the motor rotor, which is used to transmit the torque of the motor rotor to the main shaft; the helical bushing includes a first bushing wall for sleeved on the shaft, a second bushing wall for the motor rotor to sleeve, and a plurality of helical grooves disposed between the first bushing wall and the second bushing wall.

2. The electric spindle capable of reducing spindle body temperature according to claim 1, characterized in that, The number of spiral turns between the two ends of the spiral axis does not exceed one.

3. The electric spindle capable of reducing spindle body temperature according to claim 1, characterized in that, The main shaft has a shoulder on one side and at least one limiting member on the other side; the spiral bushing is disposed between the shoulder and the limiting member.

4. The electric spindle capable of reducing spindle body temperature according to claim 3, characterized in that, It includes two limiting members with internal threads, and the threads of the internal threads are opposite in direction; the other side of the main shaft is provided with two compatible and adjacent external threads.

5. The electric spindle capable of reducing spindle body temperature according to claim 4, characterized in that, The inner diameter of the second limiting member farther from the shoulder is smaller than the inner diameter of the first limiting member closer to the shoulder.

6. The electric spindle capable of reducing spindle body temperature according to claim 4 or 5, characterized in that, The outer side of the shoulder is provided with a first mounting surface that mates with the first bearing; the outer side of the external thread is provided with a second mounting surface that mates with the second bearing.

7. The electric spindle capable of reducing spindle body temperature according to claim 6, characterized in that, The electric spindle has a tool holder for connecting the cutting tool at one end near the shoulder.

8. The electric spindle capable of reducing spindle body temperature according to claim 1, characterized in that, The first bushing wall and the electric spindle, as well as the second bushing wall and the motor rotor, are connected by an interference fit.

9. The electric spindle capable of reducing spindle body temperature according to claim 1, characterized in that, The motor rotor is encased in a carbon fiber shell and attached to the wall of the second bushing.

10. The electric spindle capable of reducing spindle body temperature according to claim 1, characterized in that, The spiral bushing is made of titanium alloy.

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