Stepping motor with torque amplification coaxial output structure

Abstract

The utility model relates to the technical field of motors, in particular to a stepping motor with a torque amplification coaxial output structure, which comprises a shell, a motor and an output shaft, the motor and the output shaft are arranged on the shell, a motor shaft is arranged on the motor, the output shaft is used for being coaxially connected with a piston rod in an injector, and a gear assembly is arranged on the shell. The input end of the gear assembly is connected with the motor shaft, the output end of the gear assembly is connected with the output shaft, the output shaft and the motor shaft rotate synchronously, and the rotating speed of the motor shaft is larger than that of the output shaft. The gear assembly is arranged on one side of the motor shaft in an offset mode, so that the motor shaft and the output shaft are coaxially arranged. The motor shaft and the output shaft are connected through the gear assembly, the torque output by the motor shaft is amplified and transmitted to the output shaft, and therefore the piston rod can generate enough thrust; the gear assembly is arranged on the side face of the motor shaft in an offset mode, so that the motor shaft and the output shaft are coaxially arranged, the motor shaft and the piston rod rotate concentrically, and then thrust generated by the motor can perpendicularly act on the injection.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a stepping motor with an amplified torque coaxial output structure. Background Art

[0002] A stepping motor is the power source in a stepping motor with an amplified torque coaxial output structure. Generally, the motor output shaft is connected to the piston rod in a syringe to transmit torque to the piston rod. To ensure the output accuracy and reliability of the injection, on the one hand, the motor must have sufficient torque to generate sufficient thrust, and on the other hand, the piston rod must run stably, and the generated thrust must act vertically on the injection.

[0003] Regarding these two requirements, if the motor output shaft is directly connected to the piston rod, the torque of the motor itself is insufficient to meet the requirements. However, if a speed reducer is added between the motor output shaft and the piston rod to increase the torque, the concentricity between the motor output shaft and the piston rod cannot be guaranteed, resulting in the thrust generated by the motor being difficult to act vertically on the injection. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is: In order to solve the technical problems in the prior art, the utility model provides a stepping motor with an amplified torque coaxial output structure.

[0005] The technical solution adopted by the utility model to solve its technical problems is: A stepping motor with an amplified torque coaxial output structure, including a housing and a motor and an output shaft provided on the housing. The motor has a motor shaft. The output shaft is used for coaxial connection with the piston rod in the syringe. A gear assembly is provided on the housing. The input end of the gear assembly is connected to the motor shaft, and the output end of the gear assembly is connected to the output shaft, so that the output shaft rotates synchronously with the motor shaft, and the rotation speed of the motor shaft is greater than the rotation speed of the output shaft; the gear assembly is offset to one side of the motor shaft, so that the motor shaft and the output shaft are coaxial.

[0006] The stepping motor with an amplified torque coaxial output structure of the utility model realizes the connection between the motor shaft and the output shaft through the gear assembly, amplifies the torque output by the motor shaft and transmits it to the output shaft, so that the piston rod can generate sufficient thrust; at the same time, the gear assembly is offset to the side of the motor shaft, which is convenient for the motor shaft and the output shaft to be coaxial, so that the motor shaft and the piston rod rotate concentrically, and the thrust generated by the motor can act vertically on the injection.

[0007] Further, a driving gear is connected to the motor shaft, a driven gear is connected to the output shaft, the gear assembly includes a first intermediate gear, a second intermediate gear, and a third intermediate gear that are sequentially engaged, the first intermediate gear, the second intermediate gear, and the third intermediate gear are arranged around the motor shaft along the circumferential direction of the motor shaft, the driving gear is engaged with the first intermediate gear, the driven gear is engaged with the second intermediate gear, and the transmission ratio between the driven gear and the driving gear is greater than 1.

[0008] Further, the first intermediate gear, the second intermediate gear, and the third intermediate gear each include an input gear and an output gear. The input gear of the first intermediate gear is engaged with the driving gear, the output gear of the first intermediate gear is engaged with the input gear of the second intermediate gear, the output gear of the second intermediate gear is engaged with the input gear of the third intermediate gear, and the output gear of the third intermediate gear is engaged with the driven gear.

[0009] Further, a mounting assembly is detachably connected to the inside of the housing, and the gear assembly is mounted on the mounting assembly.

[0010] Further, the mounting assembly includes a first mounting plate and a second mounting plate. The first mounting plate and the second mounting plate are arranged in parallel and connected to each other. The second mounting plate is connected to the housing by snap connection. The gear assembly is mounted between the first mounting plate and the second mounting plate, and a driving hole for the output shaft to pass through is provided on the second mounting plate.

[0011] Further, a connecting rod is connected to the first mounting plate, and the connecting rod is connected to the second mounting plate by snap connection.

[0012] Further, a stabilizing block is mounted between the first mounting plate and the second mounting plate, and a stabilizing hole for the motor shaft to be inserted into is provided on the stabilizing block.

[0013] Further, one end of the stabilizing block along the axial direction of the motor shaft contacts the first mounting plate, and the other end contacts the second mounting plate.

[0014] Further, a positioning block is provided on the stabilizing block, and a positioning groove for the positioning block to be inserted into is provided on the first mounting plate.

[0015] Further, two ball bearings are provided on the output shaft, and the adjacent end faces of the inner rings of the two ball bearings are attached to each other.

[0016] The beneficial effects of the present utility model are

[0017] 1. The connection between the motor shaft and the output shaft is achieved through a gear assembly, which amplifies the torque output by the motor shaft and transmits it to the output shaft, enabling the piston rod to generate sufficient thrust. At the same time, the gear assembly is offset to the side of the motor shaft, facilitating the coaxial arrangement of the motor shaft and the output shaft, allowing the motor shaft and the piston rod to rotate concentrically, and enabling the thrust generated by the motor to act perpendicularly on the injection.

[0018] 2. By arranging the first intermediate gear, the second intermediate gear, and the second intermediate gear around the motor shaft in the circumferential direction of the motor shaft, it is convenient to set the motor shaft and the output shaft coaxially. At the same time, the space inside the housing is fully utilized, reducing the space occupied by the gear assembly.

[0019] 3. The detachable connection between the mounting assembly and the housing facilitates the overall assembly or disassembly of the gear assembly, reduces production costs, and is convenient for later maintenance and replacement.

[0020] 4. Through the setting of the stabilizing block and the stabilizing hole, it is convenient to improve the rotational stability of the motor shaft, ensure the reliability of its operation, and further ensure the concentricity between the motor shaft and the output shaft, thereby ensuring the concentricity between the motor shaft and the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0022] Figure 1 FIG. is a schematic structural diagram of the overall external shape of the stepping motor embodying the structure with torque amplification and coaxial output in the present utility model.

[0023] Figure 2 FIG. is an exploded structural diagram of the overall internal structure of the stepping motor embodying the structure with torque amplification and coaxial output in the present utility model.

[0024] Figure 3 FIG. is an exploded structural diagram showing the structures of the motor shaft, the mounting assembly, the gear assembly, and the output shaft in the present utility model.

[0025] Figure 4 FIG. is a schematic transmission structural diagram from the driving gear to the driven gear in the present utility model.

[0026] Figure 5 FIG. is an exploded structural diagram showing the mounting assembly in the present utility model.

[0027] Figure 6 FIG. is a schematic structural diagram showing the stabilizing block in the present utility model.

[0028] Figure 7 FIG. is an exploded structural diagram showing the ball bearing and the protective sleeve in the present utility model.

[0029] In the figure: 1. housing; 2. motor; 21. motor shaft; 22. driving gear; 3. output shaft; 31. driven gear; 4. piston rod; 5. mounting assembly; 51. first mounting plate; 511. connecting rod; 512. positioning groove; 52. second mounting plate; 521. driving hole; 522. connecting groove; 53. stabilizing block; 531. stabilizing hole; 532. positioning block; 6. gear assembly; 61. first intermediate gear; 611. input gear; 612. output gear; 62. second intermediate gear; 63. third intermediate gear; 7. ball bearing; 8. protective sleeve; 81. connecting block; 82. limiting ring. Detailed implementation manners

[0030] Now, the present utility model will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0031] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more. In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0032] The present utility model discloses a stepping motor with a coaxial output structure for amplifying torque.

[0033] Refer to Figures 1 to 7, A stepping motor with an amplified torque coaxial output structure, comprising a housing 1, a motor 2 and an output shaft 3 provided on the housing 1. The motor 2 has a motor shaft 2, and the output shaft 3 is used for coaxially and fixedly connecting with a piston rod 4 in a syringe. A mounting assembly 5 is detachably connected to the housing 1, a gear assembly 6 is provided on the mounting assembly 5, the input end of the gear assembly 6 is connected to the motor shaft 2, and the output end of the gear assembly 6 is connected to the output shaft 3, so that the output shaft 3 rotates synchronously with the motor shaft 2, and the rotation speed of the motor shaft 2 is greater than that of the output shaft 3. In addition, the gear assembly 6 is offset to one side of the motor shaft 2, so that the motor shaft 2 and the output shaft 3 are coaxially arranged.

[0034] During operation, the connection between the motor shaft 2 and the output shaft 3 is realized through the gear assembly 6, the torque output by the motor shaft 2 is amplified and transmitted to the output shaft 3, so that the piston rod 4 can generate sufficient thrust; at the same time, the gear assembly 6 is offset to the side of the motor shaft 2, which is convenient for the motor shaft 2 and the output shaft 3 to be coaxially arranged, so that the motor shaft 2 and the piston rod 4 rotate concentrically, and thus the thrust generated by the motor 2 can act vertically on the injection.

[0035] According to the stepping motor with an amplified torque coaxial output structure in this embodiment, referring to Figure 3 and Figure 4 , a driving gear 22 is coaxially and fixedly connected to the motor shaft 2, a driven gear is coaxially and fixedly connected to the output shaft 3, and the gear assembly 6 includes a first intermediate gear 61, a second intermediate gear 62 and a third intermediate gear 63 that are sequentially engaged. The first intermediate gear 61, the second intermediate gear 62 and the third intermediate gear 63 are arranged around the motor shaft 2 along the circumferential direction of the motor shaft 2, which is convenient for the motor shaft 2 and the output shaft 3 to be coaxially arranged, and at the same time makes full use of the space inside the housing 1 and reduces the space occupied by the gear assembly 6. The driving gear 22 is engaged with the first intermediate gear 61, the driven gear is engaged with the second intermediate gear 62, and the transmission ratio between the driven gear and the driving gear 22 is greater than 1, so that the torque of the output shaft 3 is greater than that of the motor shaft 2.

[0036] Specifically, the first intermediate gear 61, the second intermediate gear 62, and the third intermediate gear 63 each include an input gear 611 and an output gear 612. The input gear 611 of the first intermediate gear 61 meshes with the driving gear 22. The output gear 612 of the first intermediate gear 61 meshes with the input gear 611 of the second intermediate gear 62. The output gear 612 of the second intermediate gear 62 meshes with the input gear 611 of the third intermediate gear 63. The output gear 612 of the third intermediate gear 63 meshes with the driven gear. Preferably, the input gears 611 and the output gears 612 on the first intermediate gear 61, the second intermediate gear 62, and the third intermediate gear 63 are the same, and the number of teeth of the input gear 611 is greater than the number of teeth of the output gear 612. The first intermediate gear 61, the second intermediate gear 62, and the third intermediate gear 63 adopt the same components. Producing one kind of component can meet the requirements, which can reduce the production cost. At the same time, the transmission ratio of each stage of gear transmission is the same, so that the torque on the first intermediate gear 61, the second intermediate gear 62, and the third intermediate gear 63 increases step by step, and the increase amplitude each time is equal, which can improve the stability of gear transmission, and further ensure the stability of the rotation of the output shaft 3.

[0037] Optionally, multiple second intermediate gears 62 can be provided, which can be specifically designed according to the torque required by the output shaft 3. The more the number of the second intermediate gears 62, the greater the torque finally obtained by the output shaft 3.

[0038] According to the stepping motor with a torque-amplified coaxial output structure in this embodiment, referring to Figure 5 and Figure 6 , the mounting assembly 5 includes a first mounting plate 51 and a second mounting plate 52. The first mounting plate 51 and the second mounting plate 52 are arranged in parallel and connected to each other. The second mounting plate 52 is detachably connected to the housing 1 by clamping. The gear assembly 6 is mounted between the first mounting plate 51 and the second mounting plate 52. A driving hole 521 for the output shaft 3 to pass through is formed on the second mounting plate 52, which is convenient for improving the stability of the rotation of the output shaft 3.

[0039] Specifically, the gear shafts of the first intermediate gear 61, the second intermediate gear 62, and the third intermediate gear 63 are fixedly connected between the first mounting plate 51 and the second mounting plate 52, so that the first intermediate gear 61, the second intermediate gear 62, and the third intermediate gear 63 are integrated between the first mounting plate 51 and the second mounting plate 52, which is convenient for assembly.

[0040] For the convenience of assembling the first mounting plate 51 and the second mounting plate 52, a connecting rod 511 is integrally formed on the first mounting plate 51, and the connecting rod 511 is connected to the second mounting plate 52 by clamping.

[0041] More specifically, a stabilizing block 53 is installed between the first mounting plate 51 and the second mounting plate 52. One end of the stabilizing block 53 along the axial direction of the motor shaft 2 contacts the first mounting plate 51, and the other end contacts the second mounting plate 52. And the stabilizing block 53 and the gear assembly 6 are arranged opposite to each other along the axis of the first mounting plate 51, which is convenient for improving the overall stability of the mounting assembly 5. A positioning block 532 is integrally formed on the stabilizing block 53, and a positioning groove 512 for inserting the positioning block 532 is provided on the first mounting plate 51. The cooperation between the positioning block 532 and the positioning groove 512 is convenient for quickly positioning the stabilizing block 53 and improving the assembly efficiency. Preferably, two positioning blocks 532 are provided, which is convenient for improving the positioning accuracy. A stabilizing hole 531 for inserting the motor shaft 2 is provided on the stabilizing block 53, and a part of the motor shaft 2 is inserted into the stabilizing hole 531, which is convenient for improving the stability of the rotation of the motor shaft 2, ensuring the reliability of its operation, and at the same time facilitating further ensuring the concentricity of the motor shaft 2 and the output shaft 3, and further ensuring the concentricity of the motor shaft 2 and the piston rod 4.

[0042] To further improve the stability of the rotation of the output shaft 3, two ball bearings 7 are sleeved on the output shaft 3. The inner rings of the two ball bearings 7 are in transitional fit or interference fit with the output shaft 3, and the adjacent end faces of the inner rings of the two ball bearings 7 are attached to each other. Setting two ball bearings 7 can better limit the lateral movement of the output shaft 3, improve the output accuracy, make the output shaft 3 more stable under high-speed movement, and reduce the overall shaking. In addition, compared with oil-impregnated bearings, the ball bearings 7 have better durability and lubricity and longer service life in this environment.

[0043] To limit and protect the ball bearings 7, a protective sleeve 8 is also sleeved outside the ball bearings 7. One end of the protective sleeve 8 facing the second mounting plate 52 is integrally formed with a connecting block 81, and a connecting groove 522 for inserting the connecting block 81 is provided on the second mounting plate 52. The connecting block 81 is inserted into the connecting groove 522 so that the protective sleeve 8 is clamped with the second mounting plate 52. A plurality of connecting blocks 81 are provided along the circumferential direction of the protective sleeve 8, and a plurality of connecting grooves 522 are provided along the circumferential direction of the second mounting plate 52. The plurality of connecting grooves 522 and the plurality of connecting blocks 81 correspond to each other one by one. In this embodiment, both the connecting block 81 and the connecting groove 522 are provided with three, and both are arranged in a circumferential array along the protective sleeve 8.

[0044] More specifically, a limiting ring 82 is integrally formed at one end of the protective sleeve 8 away from the mounting plate. The inner hole diameter of the limiting ring 82 is smaller than the outer diameter of the outer ring of the ball bearing 7, so as to limit the ball bearing 7.

[0045] The protective sleeve 8 and the limiting ring 82 are convenient for protecting the ball bearings 7, reducing the possibility of impurities entering the ball bearings 7, and further improving the service life of the ball bearings 7. In addition to being able to protect the ball bearings 7, the limiting ring 82 can also axially limit the ball bearings 7 and prevent the axial movement of the ball bearings 7.

[0046] Working principle: The connection between the motor shaft 2 and the output shaft 3 is realized through the gear assembly 6, the torque output by the motor shaft 2 is amplified and transmitted to the output shaft 3, so that the piston rod 4 can generate sufficient thrust; at the same time, the first intermediate gear 61, the second intermediate gear 62 and the third intermediate gear 63 are arranged around the motor shaft 2 along the circumferential direction of the motor shaft 2, which is convenient for the motor shaft 2 and the output shaft 3 to be coaxially arranged, so that the motor shaft 2 and the piston rod 4 rotate concentrically, and thus the thrust generated by the motor 2 can act vertically on the injection.

[0047] In addition, the installation assembly 5 is detachably connected to the housing 1, which is convenient for the overall assembly or disassembly of the gear assembly 6, can reduce the production cost, and is convenient for later maintenance and replacement. Through the setting of the stabilizing block 53 and the stabilizing hole 531, it is convenient to improve the rotation stability of the motor shaft 2, ensure the reliability of its operation, and at the same time facilitate further ensuring the concentricity between the motor shaft 2 and the output shaft 3, and thus ensure the concentricity between the motor shaft 2 and the piston rod 4.

[0048] Enlightened by the above ideal embodiments based on the present utility model, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A stepper motor with a coaxial output structure for amplifying torque, characterized in that, It includes a housing (1), a motor (2) and an output shaft (3) provided on the housing (1). The motor (2) has a motor shaft (21). The output shaft (3) is used for coaxial connection with a piston rod (4) in a syringe. A gear assembly (6) is provided on the housing (1). The input end of the gear assembly (6) is connected to the motor shaft (21), and the output end of the gear assembly (6) is connected to the output shaft (3) so that the output shaft (3) rotates synchronously with the motor shaft (21), and the rotational speed of the motor shaft (21) is greater than the rotational speed of the output shaft (3). The gear assembly (6) is offset to one side of the motor shaft (21) so that the motor shaft (21) and the output shaft (3) are coaxially arranged.

2. The stepping motor with a coaxial output structure for amplifying torque according to claim 1, wherein A driving gear (22) is connected to the motor shaft (21), and a driven gear is connected to the output shaft (3). The gear assembly (6) includes a first intermediate gear (61), a second intermediate gear (62) and a third intermediate gear (63) that are sequentially engaged. The first intermediate gear (61), the second intermediate gear (62) and the third intermediate gear (63) are arranged around the motor shaft (21) along the circumferential direction of the motor shaft (21). The driving gear (22) is engaged with the first intermediate gear (61), the driven gear is engaged with the second intermediate gear (62), and the transmission ratio between the driven gear and the driving gear (22) is greater than 1.

3. The stepper motor with a coaxial output structure for amplifying torque according to claim 2, characterized in that, The first intermediate gear (61), the second intermediate gear (62) and the third intermediate gear (63) each include an input gear (611) and an output gear (612). The input gear (611) of the first intermediate gear (61) is engaged with the driving gear (22), the output gear (612) of the first intermediate gear (61) is engaged with the input gear (611) of the second intermediate gear (62), the output gear (612) of the second intermediate gear (62) is engaged with the input gear (611) of the third intermediate gear (63), and the output gear (612) of the third intermediate gear (63) is engaged with the driven gear.

4. The stepping motor with a coaxial output structure for amplifying torque according to claim 1, characterized in that, An installation assembly (5) is detachably connected inside the housing (1), and the gear assembly (6) is installed on the installation assembly (5).

5. The stepper motor with a coaxial output structure for amplifying torque as claimed in claim 4, wherein, The installation assembly (5) includes a first mounting plate (51) and a second mounting plate (52). The first mounting plate (51) and the second mounting plate (52) are arranged in parallel and connected to each other. The second mounting plate (52) is connected to the housing (1) through snap connection. The gear assembly (6) is installed between the first mounting plate (51) and the second mounting plate (52). A driving hole (521) for the output shaft (3) to pass through is provided on the second mounting plate (52).

6. The stepper motor with an amplified torque coaxial output structure as described in claim 5, characterized in that, A connecting rod (511) is connected to the first mounting plate (51), and the connecting rod (511) is connected to the second mounting plate (52) through snap connection.

7. The stepping motor with an amplified torque coaxial output structure according to claim 6, characterized in that, A stabilizing block (53) is installed between the first mounting plate (51) and the second mounting plate (52), and a stabilizing hole (531) for inserting the motor shaft (21) is provided on the stabilizing block (53).

8. The stepper motor with a magnified torque coaxial output structure as described in claim 7, characterized in that, One end of the stabilizing block (53) along the axial direction of the motor shaft (21) contacts the first mounting plate (51), and the other end contacts the second mounting plate (52).

9. The stepping motor with an amplified torque coaxial output structure as described in claim 7, wherein A positioning block (532) is provided on the stabilizing block (53), and a positioning groove (512) for inserting the positioning block (532) is provided on the first mounting plate (51).

10. The stepping motor with an amplified torque coaxial output structure as described in claim 1, characterized in that, Two ball bearings (7) are provided on the output shaft (3), and the adjacent end faces of the inner rings of the two ball bearings (7) are attached to each other.

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