External rotating shaft locking mechanism for spindle-free servo motor

Abstract

The utility model relates to the technical field of servo motors, in particular to an external rotating shaft locking mechanism for a spindle-free servo motor, which comprises a rotating shaft sleeve with a hollow cavity, the rotating shaft sleeve is T-shaped and comprises a rotor iron core sleeving part and a limiting part which are connected with each other, the rotor iron core sleeving part is used for sleeving a rotor iron core, and the limiting part is used for limiting the rotor iron core. The limiting part is used for performing single-side radial limiting on the rotor iron core; the hollow cavity comprises an external rotating shaft penetrating cavity corresponding to the rotor iron core sleeving part and an external rotating shaft locking cavity corresponding to the limiting part; an expansion sleeve assembly is arranged in the external rotating shaft locking cavity, and the expansion sleeve assembly can lock the external rotating shaft entering the external rotating shaft locking cavity. The locking mechanism is simple in structure, easy to assemble, disassemble and maintain and good in locking effect.

Description

Technical Field

[0001] The utility model relates to the technical field of servo motors, in particular to an external rotating shaft locking mechanism for a spindleless servo motor. Background Art

[0002] A servo motor is an engine that controls the operation of mechanical components in a servo system. It is an auxiliary motor indirect speed change device that can convert voltage signals into torque and speed to drive the control object, and has the characteristics of high-precision control of speed and position. Its working principle is that its rotor speed is controlled by the input signal and can respond quickly. In the automatic control system, the servo motor is used as an actuator, with characteristics such as small electromechanical time constant, high linearity, and starting voltage. It can convert the received electrical signal into angular displacement or angular velocity output on the motor shaft. It is widely used in automation equipment that requires precise positioning, high-speed movement, high torque output, high stability, low noise, etc., such as CNC machine tools, semiconductor manufacturing, imaging equipment, packaging equipment, and robotics.

[0003] As a type of servo motor, the shaftless servo motor is a special type of servo motor, which is different from the traditional servo motor in design and structure. Specifically, the shaftless servo motor does not have a traditional physical shaft, but directly drives the load through an internal mechanism to achieve precise position, speed and force control. The Chinese utility model patent with publication number CN203883649U discloses a bearingless servo motor mounting structure and a special assembly tool, including a base, in which a main shaft is positioned; the housing is fixed on the base, and the hollow rotor sleeve is arranged on the main shaft, and the side wall of the hollow rotor shaft is threaded with a screw, and the end face of the screw can be against the outer side of the main shaft. Furthermore, a strip locking groove parallel to the axis of the main shaft is opened on the outer side surface of the main shaft, and the head of the screw is embedded in the locking groove, the end face of the screw can be against the bottom surface of the locking groove, and the side of the screw can be against the side of the locking groove.

[0004] The above-mentioned connection method between the external rotating shaft and the hollow rotating shaft adopts screw connection. Since it cannot achieve complete encirclement of the circumference of the external rotating shaft, it is easy to cause the screws to loosen during operation, resulting in loosening of the external rotating shaft; in addition, this structure requires disassembly of the equipment when locking, which greatly increases the complexity of installing the external rotating shaft.

[0005] Therefore, a new technical solution is urgently needed to solve the above technical problems. Utility Model Content

[0006] The purpose of the utility model is to overcome the above-mentioned problems of the prior art and to provide an external shaft locking mechanism for a spindleless servo motor, so as to solve the technical problems that the traditional shaftless servo motor adopts screw connection, cannot completely surround the circumference of the external shaft, and thus easily leads to loosening of the screws during operation, resulting in loosening of the external shaft, and the need for disassembly during installation.

[0007] The above objectives are achieved through the following technical solutions:

[0008] A spindle-less servo motor external shaft locking mechanism, comprising a spindle sleeve with a hollow cavity, the spindle sleeve being T-shaped, comprising a rotor core sleeve connection portion and a limiting portion connected to each other, the rotor core sleeve connection portion being used for sleeve connection of the rotor core, and the limiting portion being used for radially limiting the rotor core on one side; the hollow cavity comprising an external shaft through cavity corresponding to the rotor core sleeve connection portion, and an external shaft locking cavity corresponding to the limiting portion; an expansion sleeve assembly is arranged in the external shaft locking cavity, and the expansion sleeve assembly can lock the external shaft entering the external shaft locking cavity.

[0009] Furthermore, the expansion sleeve assembly includes a first expansion sleeve and a second expansion sleeve embedded in the locking cavity of the external shaft, and the first expansion sleeve can be sleeved on the second expansion sleeve to form an annular gap therebetween.

[0010] Furthermore, the sleeve surfaces of the first expansion sleeve and the second expansion sleeve are inclined surfaces.

[0011] Furthermore, the inclination of the inclined surface is 10° to 45°.

[0012] Furthermore, mutually symmetrical locking threaded through holes are respectively provided on the first expansion sleeve and the second expansion sleeve, and are locked and connected by locking screws.

[0013] Furthermore, both the first expansion sleeve and the second expansion sleeve are provided with expansion and contraction joints.

[0014] Furthermore, the first expansion sleeve and the second expansion sleeve are both made of rubber.

[0015] Furthermore, an inertia disk is arranged between the limiting portion and the rotor core.

[0016] Furthermore, an end cover capable of sealing the external rotating shaft locking cavity is also provided at the end of the rotating shaft sleeve.

[0017] Furthermore, a locking screw through hole corresponding to the position of the locking threaded through hole is also provided on the end cover.

[0018] The utility model provides an external shaft locking mechanism for a spindleless servo motor, which can achieve rapid connection with the external shaft by sleeve-connecting one end of the external shaft, and achieve rapid circumferential clamping through an expansion sleeve assembly, thereby achieving locking of the sleeved section of the external shaft. The locking mechanism is not only simple in structure, easy to assemble and disassemble for maintenance, but also has a good locking effect; in addition, an end cover is provided to protect the expansion sleeve assembly, and the expansion sleeve assembly can be directly adjusted quickly and accurately without removing the end cover, thereby achieving locking and unlocking of the external shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a first-view structural schematic diagram of an external shaft locking mechanism for a spindleless servo motor according to the utility model;

[0020] Figure 2 This is a second perspective structural schematic diagram of an external shaft locking mechanism for a spindleless servo motor according to the utility model;

[0021] Figure 3 It is a cross-sectional view of an external shaft locking mechanism for a spindleless servo motor according to the utility model;

[0022] Figure 4 This is an exploded view of an external shaft locking mechanism for a spindleless servo motor according to the utility model;

[0023] Figure 5 This is a cross-sectional view of the connection between a locking screw and a locking threaded through hole in an external shaft locking mechanism for a spindleless servo motor according to the utility model;

[0024] Figure 6 This is a cross-sectional view of the connection between a screw and a threaded hole in an external shaft locking mechanism for a spindleless servo motor described in the utility model.

[0025] Graphic marking:

[0026] 1-rotating shaft sleeve, 101-hollow cavity, 102-rotor core sleeve connection part, 103-limiting part, 104-external rotating shaft through cavity, 105-external rotating shaft locking cavity;

[0027] 2-expansion sleeve assembly, 201-first expansion sleeve, 202-second expansion sleeve, 203-annular gap, 204-locking threaded through hole, 205-locking screw, 206-expansion joint;

[0028] 3- rotor core;

[0029] 4-Inertia disk;

[0030] 5-end cover, 501-locking screw through hole;

[0031] 6-threaded hole;

[0032] 7- Screws. DETAILED DESCRIPTION

[0033] The utility model is further described in detail below based on the accompanying drawings and embodiments. The described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] like Figure 1 to Figure 3 As shown, an external shaft locking mechanism for a spindleless servo motor comprises a shaft sleeve 1 with a hollow cavity 101, wherein the shaft sleeve 1 is T-shaped, and comprises a rotor core sleeve connection portion 102 and a limiting portion 103 which are connected to each other, wherein the rotor core sleeve connection portion 102 is used for sleeve connection of a rotor core 3, and the limiting portion 103 is used for radially limiting the rotor core 3 on one side; the hollow cavity 101 comprises an external shaft through cavity 104 corresponding to the rotor core sleeve connection portion 102, and an external shaft locking cavity 105 corresponding to the limiting portion 103; an expansion sleeve assembly 2 is arranged in the external shaft locking cavity 105, and the expansion sleeve assembly 2 can lock the external shaft entering the external shaft locking cavity 105.

[0035] Working principle:

[0036] The front end of the shaft sleeve 1 is aligned with one end of the external shaft and sleeved thereon. One end of the external shaft enters the external shaft locking cavity 105 after passing through the external shaft through cavity 104 and is sleeved by the expansion sleeve assembly 2. By adjusting the expansion sleeve assembly 2, it is achieved that it only hugs the outer wall of the external shaft, thereby achieving the purpose of locking the external shaft.

[0037] like Figure 3 and Figure 4 As shown, the expansion sleeve assembly 2 in this embodiment includes a first expansion sleeve 201 and a second expansion sleeve 202 embedded in the external shaft locking cavity 105. The first expansion sleeve 201 can be sleeved on the second expansion sleeve 202 to form an annular gap 203 therebetween.

[0038] When pressure is applied to the second expansion sleeve 202 toward the first expansion sleeve 201 , the width of the annular gap 203 will gradually decrease, and the inner diameter of the inner ring of the second expansion sleeve 202 will gradually decrease, thereby achieving a tight grip on the external shaft sleeved by the inner ring.

[0039] It should be noted that in this embodiment, the sleeve surfaces of the first expansion sleeve 201 and the second expansion sleeve 202 are inclined surfaces, which can better facilitate the adjustment of the width of the annular gap 203. Specifically, the inclination of the inclined surface is 10° to 45°.

[0040] like Figure 4 and Figure 5 As shown, in this embodiment, mutually symmetrical locking threaded through holes 204 are respectively provided on the first expansion sleeve 201 and the second expansion sleeve 202, and are locked and connected by locking screws 205. By rotating the locking screws 205 clockwise or counterclockwise, the width of the annular gap 203 can be adjusted to achieve the purpose of locking the external shaft.

[0041] In addition, the first expansion sleeve 201 and the second expansion sleeve 202 are both provided with expansion joints 206. When the first expansion sleeve 201 and the second expansion sleeve 202 are mutually sleeved and pressed, the expansion joints 206 can cause the outer diameters of the first expansion sleeve 201 and the second expansion sleeve 202 to deform, thereby better adapting to the locking of external rotating shafts with different inner diameters.

[0042] It should be noted that the first expansion sleeve 201 and the second expansion sleeve 202 are both made of rubber material, which has the advantages of high wear resistance, high temperature resistance, aging resistance and good elasticity.

[0043] like Figure 3 As shown, an inertia disk 4 is also provided between the limit portion 103 and the rotor core 3. By using the inertia disk 4, it is possible to avoid using a motor with a large starting torque, which can effectively reduce the power consumption of the motor. It can also reduce the deflection of the motor shaft, which helps to improve the stability of the motor rotation.

[0044] As an optimization of this solution, Figure 6 As shown, the end of the shaft sleeve 1 is also provided with an end cover 5 that can seal the external shaft locking cavity 105. The end cover 5 can be used to limit the first expansion sleeve 201 and the second expansion sleeve 202 located in the external shaft locking cavity 105, and can also effectively prevent the external environment from interfering with the internal. The end of the end cover 5 and the end of the shaft sleeve 1 are both provided with corresponding threaded holes 6, and the two are screwed together by screws 7.

[0045] like Figure 4As shown, in this embodiment, a locking screw through hole 501 corresponding to the position of the locking threaded through hole 204 is further provided on the end cover 5, and the locking screw through hole 501 can facilitate the penetration of the locking screw 205, so as to achieve adjustment of the locking screw 205 without removing the end cover, that is, the locking screw through hole 204 is penetrated by a screwdriver and acts on the locking screw 205 located in the external shaft locking cavity 105 and already screwed to the locking threaded through hole 204.

[0046] The above description is only for illustrating the implementation mode of the present invention and is not intended to limit the present invention. For those skilled in the art, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An external shaft locking mechanism for a spindleless servo motor, characterized in that: The invention comprises a rotating shaft sleeve (1) with a hollow cavity (101), wherein the rotating shaft sleeve (1) is T-shaped and comprises a rotor core sleeve connection portion (102) and a limiting portion (103) which are connected to each other, wherein the rotor core sleeve connection portion (102) is used for being sleeved by a rotor core (3), and the limiting portion (103) is used for radially limiting the rotor core (3) on one side; the hollow cavity (101) comprises an external rotating shaft through cavity (104) corresponding to the rotor core sleeve connection portion (102), and an external rotating shaft locking cavity (105) corresponding to the limiting portion (103); an expansion sleeve assembly (2) is arranged in the external rotating shaft locking cavity (105), and the expansion sleeve assembly (2) can lock the external rotating shaft entering the external rotating shaft locking cavity (105).

2. The external shaft locking mechanism for a spindleless servo motor according to claim 1, characterized in that: The expansion sleeve assembly (2) comprises a first expansion sleeve (201) and a second expansion sleeve (202) embedded in the external shaft locking cavity (105); the first expansion sleeve (201) can be sleeved onto the second expansion sleeve (202) to form an annular gap (203) between the two.

3. The external shaft locking mechanism for a spindleless servo motor according to claim 2, characterized in that: The sleeve surfaces of the first expansion sleeve (201) and the second expansion sleeve (202) are inclined surfaces.

4. The external shaft locking mechanism for a spindleless servo motor according to claim 3, characterized in that: The inclination of the inclined surface is 10° to 45°.

5. The external shaft locking mechanism for a spindleless servo motor according to claim 2, characterized in that: Mutually symmetrical locking threaded through holes (204) are respectively provided on the first expansion sleeve (201) and the second expansion sleeve (202), and are locked and connected via locking screws (205).

6. An external shaft locking mechanism for a spindleless servo motor according to claim 2 or 5, characterized in that: The first expansion sleeve (201) and the second expansion sleeve (202) are both provided with expansion and contraction joints (206).

7. The external shaft locking mechanism for a spindleless servo motor according to claim 6, characterized in that: The first expansion sleeve (201) and the second expansion sleeve (202) are both made of rubber.

8. The external shaft locking mechanism for a spindleless servo motor according to claim 1, characterized in that: An inertia disk (4) is also provided between the limiting portion (103) and the rotor core (3).

9. The external shaft locking mechanism for a spindleless servo motor according to claim 5, characterized in that: The end of the rotating shaft sleeve (1) is also provided with an end cover (5) capable of sealing the external rotating shaft locking cavity (105).

10. The external shaft locking mechanism for a spindleless servo motor according to claim 9, characterized in that: The end cover (5) is also provided with a locking screw through hole (501) corresponding to the position of the locking threaded through hole (204).

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