A linear stepping motor with detachable screw

Abstract

The utility model discloses a linear step motor of detachable screw rod, it includes motor main body, drive screw rod, motor main body includes motor shell, stator subassembly, rotor subassembly, and the rotor subassembly core part sets up drive shaft sleeve, and the inner wall of drive shaft sleeve center hole sets up internal thread, and the external thread of drive screw rod is screwed with the internal thread of drive shaft sleeve, motor shell front surface fastening front side end cover, and drive shaft sleeve front end portion is connected with the front side end cover rotation through the front ball bearing, motor shell rear surface fastening rear side end cover, and the rear end portion of drive shaft sleeve is connected with the rear side end cover rotation through the rear ball bearing, and the elastic piece that is sleeved in the drive screw rod periphery and is forward elastic resistance top rear ball bearing is installed between rear side end cover and rear ball bearing. Through above -mentioned structural design, the utility model has novel structure design, the good advantage of screw rod linear motion stability.

Description

Technical Field

[0001] This utility model relates to the field of linear stepper motor technology, and in particular to a linear stepper motor with a detachable screw. Background Technology

[0002] The Chinese utility model patent with patent number ZL202120827193.3 and patent name, entitled "A Through-Shaft Linear Stepper Motor with Braking Device," specifically discloses the following technical solution: A through-shaft linear stepper motor with braking device includes a motor housing, a stator assembly, a rotor assembly, and a screw. The stator assembly is located on the outer periphery of the rotor assembly and is used to connect to an external circuit. After an excitation current is applied to the stator assembly, a changing magnetic field is generated, thereby driving the rotor assembly to rotate. The screw passes through both ends of the motor housing, and the rotor assembly is threadedly connected to the outer periphery of the screw. The screw is connected to an external device. The rotor assembly includes a rotor and a rotating shaft that rotates synchronously with the rotor. The inner surface of the rotating shaft has an internal thread that is threadedly connected to the screw. The two ends of the motor housing are rotatably connected to the rotating shaft through bearings, and the rotating shaft has shoulders that can abut against the opposite end faces of the two bearings.

[0003] It should be noted that the above-mentioned through-shaft linear stepper motor with braking device still has the following defects: the internal thread on the inner surface of the shaft is screwed to the external thread of the screw. During the process of the shaft rotating and driving the screw to move linearly, the screw drives the corresponding actuator to move. Since there will be a meshing gap between the internal thread and the external thread connection structure, the gap will cause axial movement when the shaft drives the screw to move linearly, which will cause the actuator driven by the screw to move unsteadily. Utility Model Content

[0004] The purpose of this invention is to provide a linear stepper motor with a detachable screw to address the shortcomings of existing technologies. This linear stepper motor with a detachable screw has a novel structural design and good linear motion stability of the screw.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution.

[0006] A linear stepper motor with a detachable screw includes a motor body and a drive screw. The motor body includes a motor housing. A stator assembly and a rotor assembly located inside the stator assembly are installed inside the motor housing. A drive bushing is provided in the core of the rotor assembly. An internal thread is provided on the inner wall of the center hole of the drive bushing.

[0007] The drive screw passes through the motor housing from front to back and passes through the center hole of the drive shaft sleeve. The external thread of the drive screw is screwed into the internal thread of the drive shaft sleeve.

[0008] A front end cover is fastened to the front surface of the motor housing. The front end of the drive screw passes through the front end cover and extends to the front end of the front end cover. The front end of the drive shaft sleeve is rotatably connected to the front end cover through a front ball bearing.

[0009] A rear end cover is fastened to the rear surface of the motor housing. The rear end of the drive screw passes through the rear end cover and extends to the rear end side of the rear end cover. The rear end of the drive shaft sleeve is rotatably connected to the rear end cover through a rear ball bearing.

[0010] An elastic element is installed between the rear end cover and the rear ball bearing, which is fitted around the drive screw and elastically abuts against the rear ball bearing.

[0011] The front end cover has a front bearing hole, and the front ball bearing is fitted into the front bearing hole; the front end of the drive bushing has a front shoulder, the front end of the drive bushing is interference-fitted with the inner ring of the front ball bearing, and the front shoulder of the drive bushing abuts against the rear end face of the inner ring of the front ball bearing.

[0012] The rear end cover has a rear bearing hole, and the rear ball bearing is fitted into the rear bearing hole; the rear end of the drive bushing has a rear shoulder, the rear end of the drive bushing is interference-fitted with the inner ring of the rear ball bearing, and the rear shoulder of the drive bushing abuts against the front end face of the inner ring of the rear ball bearing.

[0013] The elastic element is located in the rear bearing hole of the rear end cover, and the elastic element elastically abuts against the rear end face of the outer ring of the rear ball bearing.

[0014] The elastic element is a wave-shaped spring sheet.

[0015] The stator assembly includes a winding frame, which is fixedly installed inside the motor housing, and the winding frame is wound with coil windings.

[0016] The rotor assembly also includes a magnet, which is fitted around the drive shaft sleeve and is securely connected to the drive shaft sleeve.

[0017] The front end of the drive screw is provided with a connecting part, and the connecting part has a connecting hole.

[0018] Compared with existing technologies, this utility model has the following advantages: Specifically, during the linear motion of the drive screw driven by the drive shaft sleeve, the elastic element elastically abuts against the rear ball bearing. The elastic force of the elastic element ensures that the internal thread of the drive shaft sleeve and the external thread of the drive screw are tightly engaged. Furthermore, the elastic force of the elastic element effectively prevents meshing gaps between the internal and external threads, thus effectively eliminating axial movement during the linear motion of the drive screw, thereby improving the smoothness of the actuator driven by the drive screw. Therefore, the linear stepper motor with a detachable screw of this utility model has the advantages of novel structural design and good linear motion smoothness of the screw. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is an exploded view of the present invention.

[0022] Figure 3 This is a cross-sectional schematic diagram of the present invention.

[0023] exist Figures 1 to 3 This includes:

[0024] 1-Motor body; 2-Drive screw; 21-Connecting part; 211-Connecting hole; 3-Motor housing; 4-Stator assembly; 41-Winding frame; 5-Rotor assembly; 51-Drive shaft sleeve; 511-Internal thread; 512-Front shoulder; 513-Rear shoulder; 52-Magnet; 61-Front end cover; 611-Front bearing hole; 62-Front ball bearing; 71-Rear end cover; 711-Rear bearing hole; 72-Rear ball bearing; 8-Elastic element. Detailed Implementation

[0025] The present invention will now be described in conjunction with specific embodiments.

[0026] Example 1, as Figures 1 to 3 As shown, a linear stepper motor with a detachable screw includes a motor body 1 and a drive screw 2. The motor body 1 includes a motor housing 3. The motor housing 3 is equipped with a stator assembly 4 and a rotor assembly 5 located inside the stator assembly 4. The core of the rotor assembly 5 is provided with a drive bushing 51, and the inner wall of the center hole of the drive bushing 51 is provided with an internal thread 511.

[0027] Among them, such as Figure 2 and Figure 3As shown, the drive screw 2 passes through the motor housing 3 from front to back and passes through the center hole of the drive shaft sleeve 51. The external thread of the drive screw 2 is screwed into the internal thread 511 of the drive shaft sleeve 51.

[0028] Furthermore, such as Figures 1 to 3 As shown, a front end cover 61 is fastened to the front surface of the motor housing 3. The front end of the drive screw 2 passes through the front end cover 61 and extends to the front end side of the front end cover 61. The front end of the drive shaft sleeve 51 is rotatably connected to the front end cover 61 through a front ball bearing 62.

[0029] Furthermore, such as Figures 1 to 3 As shown, a rear end cover 71 is fastened to the rear surface of the motor housing 3. The rear end of the drive screw 2 passes through the rear end cover 71 and extends to the rear end side of the rear end cover 71. The rear end of the drive shaft sleeve 51 is rotatably connected to the rear end cover 71 through a rear ball bearing 72.

[0030] In addition, such as Figure 2 and Figure 3 As shown, an elastic element 8 is installed between the rear end cover 71 and the rear ball bearing 72, which is fitted around the drive screw 2 and elastically abuts against the rear ball bearing 72.

[0031] It needs to be explained that, such as Figure 1 and Figure 2 As shown, the front end of the drive screw 2 is provided with a connecting part 21, and the connecting part 21 has a connecting hole 211. In the use of the linear stepper motor with a detachable screw in this embodiment, the connecting part 21 of the drive screw 2 is connected to the actuator; specifically, the connecting part 21 of the drive screw 2 can be connected to the actuator by a screw or pin passing through the connecting hole 211.

[0032] When the linear stepper motor with a detachable screw in this embodiment is used, the stator assembly 4 generates a changing magnetic field after the excitation current is applied and drives the rotor assembly 5 to rotate. The rotating rotor assembly 5 drives the drive shaft sleeve 51 to rotate synchronously. Since the external thread of the drive screw 2 is screwed to the internal thread 511 of the drive shaft sleeve 51, and since the connecting part 21 of the drive screw 2 is connected to the actuator and the drive screw 2 does not rotate, the drive shaft sleeve 51 drives the drive screw 2 to move linearly.

[0033] It should be emphasized that the front and rear ends of the drive bushing 51 are rotatably connected to the corresponding front end cover 61 and rear end cover 71 through the corresponding front ball bearing 62 and rear ball bearing 72, respectively. The front ball bearing 62 and rear ball bearing 72 can effectively ensure the positional accuracy of the drive bushing 51 and improve the smoothness of its rotation.

[0034] It should be further emphasized that the drive screw 2 can be disassembled and replaced. When using it, the user can adapt the drive screw 2 with the same thread for different purposes to achieve the effect of one machine serving multiple purposes.

[0035] During the linear motion of the drive screw 2 driven by the drive bushing 51, the elastic element 8 elastically abuts against the rear ball bearing 72. The elastic force of the elastic element 8 makes the internal thread 511 of the drive bushing 51 and the external thread of the drive screw 2 fit tightly together. The elastic force of the elastic element 8 can effectively prevent the meshing gap between the internal thread 511 and the external thread connection structure, that is, it can effectively eliminate the axial movement phenomenon during the linear motion of the drive screw 2, thereby improving the smoothness of the action of the actuator driven by the drive screw 2.

[0036] In summary, the linear stepper motor with a detachable screw in this embodiment has the advantages of novel structural design and smooth linear motion of the screw, thanks to the above structural design.

[0037] Example 2, as Figure 2 and Figure 3 As shown, the difference between this embodiment 2 and embodiment 1 is that: the front end cover 61 has a front bearing hole 611, and the front ball bearing 62 is embedded in the front bearing hole 611; the front end of the drive bushing 51 is provided with a front shoulder 512, the front end of the drive bushing 51 is interference-fitted with the inner ring of the front ball bearing 62, and the front shoulder 512 of the drive bushing 51 abuts against the rear end face of the inner ring of the front ball bearing 62.

[0038] The rear end cover 71 has a rear bearing hole 711, and the rear ball bearing 72 is fitted into the rear bearing hole 711. The rear end of the drive bushing 51 has a rear shoulder 513. The rear end of the drive bushing 51 is interference-fitted with the inner ring of the rear ball bearing 72, and the rear shoulder 513 of the drive bushing 51 abuts against the front end face of the inner ring of the rear ball bearing 72.

[0039] Furthermore, the elastic element 8 is located in the rear bearing hole 711 of the rear end cover 71, and the elastic element 8 elastically abuts against the rear end face of the outer ring of the rear ball bearing 72.

[0040] Example 3, as Figure 2 and Figure 3 As shown, the difference between this embodiment 3 and embodiment 1 is that the elastic element 8 is a wave-shaped spring sheet.

[0041] Example 4, as Figure 2 and Figure 3 As shown, the difference between this embodiment 4 and embodiment 1 is that the stator assembly 4 includes a winding frame 41, which is fixedly installed inside the motor housing 3, and the winding frame 41 is wound with coil windings.

[0042] The rotor assembly 5 also includes a magnet 52, which is fitted around the drive shaft sleeve 51 and is securely connected to the drive shaft sleeve 51.

[0043] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A linear stepper motor with a detachable screw, comprising a motor body (1) and a drive screw (2). The motor body (1) includes a motor housing (3). A stator assembly (4) and a rotor assembly (5) located inside the stator assembly (4) are installed inside the motor housing (3). A drive bushing (51) is provided in the core of the rotor assembly (5). An internal thread (511) is provided on the inner wall of the center hole of the drive bushing (51). The drive screw (2) passes through the motor housing (3) from front to back and passes through the center hole of the drive bushing (51). The external thread of the drive screw (2) is screwed into the internal thread (511) of the drive bushing (51). Its features are: A front end cover (61) is fastened to the front surface of the motor housing (3). The front end of the drive screw (2) passes through the front end cover (61) and extends to the front end of the front end cover (61). The front end of the drive bushing (51) is rotatably connected to the front end cover (61) through the front ball bearing (62). A rear end cover (71) is fastened to the rear surface of the motor housing (3). The rear end of the drive screw (2) passes through the rear end cover (71) and extends to the rear end side of the rear end cover (71). The rear end of the drive bushing (51) is rotatably connected to the rear end cover (71) through a rear ball bearing (72). An elastic element (8) is installed between the rear end cover (71) and the rear ball bearing (72), which is fitted around the drive screw (2) and elastically abuts against the rear ball bearing (72) in the forward direction.

2. A linear stepper motor with a detachable screw according to claim 1, characterized in that: The front end cap (61) has a front bearing hole (611), and the front ball bearing (62) is fitted into the front bearing hole (611); the front end of the drive bushing (51) is provided with a front shoulder (512), the front end of the drive bushing (51) is interference-fitted with the inner ring of the front ball bearing (62), and the front shoulder (512) of the drive bushing (51) abuts against the rear end face of the inner ring of the front ball bearing (62); The rear end cover (71) has a rear bearing hole (711), and the rear ball bearing (72) is fitted into the rear bearing hole (711); the rear end of the drive bushing (51) is provided with a rear shoulder (513), the rear end of the drive bushing (51) is interference-fitted with the bearing inner ring of the rear ball bearing (72), and the rear shoulder (513) of the drive bushing (51) abuts against the front end face of the bearing inner ring of the rear ball bearing (72); The elastic element (8) is located in the rear bearing hole (711) of the rear end cover (71), and the elastic element (8) elastically abuts against the rear end face of the outer ring of the rear ball bearing (72).

3. A linear stepper motor with a detachable screw according to claim 1, characterized in that: The elastic element (8) is a wave-shaped spring sheet.

4. A linear stepper motor with a detachable screw according to claim 1, characterized in that: The stator assembly (4) includes a winding frame (41), which is fixedly installed inside the motor housing (3), and the winding frame (41) is wound with coil windings. The rotor assembly (5) also includes a magnet (52), which is fitted around the drive shaft sleeve (51) and is securely connected to the drive shaft sleeve (51).

5. A linear stepper motor with a detachable screw according to claim 1, characterized in that: The front end of the drive screw (2) is provided with a connecting part (21), and the connecting part (21) has a connecting hole (211).

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