CN210693742U

CN210693742U - Stepping motor and monitoring equipment using same

Info

Publication number: CN210693742U
Application number: CN201921498414.6U
Authority: CN
Inventors: 冯佳慧; 王富冈; 王远磊
Original assignee: Jiangsu Leili Motor Co Ltd
Current assignee: Jiangsu Leili Motor Co Ltd
Priority date: 2019-09-10
Filing date: 2019-09-10
Publication date: 2020-06-05
Anticipated expiration: 2029-09-10

Abstract

The utility model discloses a stepping motor and a monitoring device using the stepping motor, which comprises a power assembly, a motor bracket connected with the power assembly, and an output shaft assembly in transmission connection with the power assembly through the motor bracket; the output shaft assembly comprises an output shaft and an output gear fixedly arranged on the output shaft; a positioning column matched with the output shaft is arranged on the motor support, and a positioning hole in clearance fit with the positioning column is arranged at the end part, facing the motor support, of the output shaft; the output gear is fixedly connected with one end of the output shaft, which is provided with a positioning hole; one end of the output shaft, which is far away from the positioning hole, is fixedly connected with a synchronizing wheel. The utility model discloses can slow down step motor's motor support's the rate of wear in order to reduce the crooked probability of output shaft.

Description

Stepping motor and monitoring equipment using same

Technical Field

The utility model relates to the technical field of electric machines, especially, relate to a step motor and use this step motor's supervisory equipment.

Background

In order to increase the monitoring angle and monitor the current monitoring equipment at a fixed point at any time, a synchronous wheel on a stepping motor is often adopted to drive a synchronous belt to rotate. After the monitoring camera operates for a long time, the condition that the blind area appears in the monitoring area when the monitoring camera rotates up and down can exist, and the main reason of the blind area is as follows: the output shaft of the stepping motor is inclined; because the output shaft of the stepping motor is in clearance fit with the bearing. When the output shaft is subjected to unidirectional radial force for a long time, the output shaft can deflect to the bearing end, and the root of the output shaft is subjected to skew stress.

The output shaft of the existing stepping motor is processed by adopting a metal material, and the bracket of the stepping motor adopts a plastic injection molding processing technology. The output shaft root shaft head is small in size, so that the contact area with the motor support is small, when the motor support rotates under long-time stress, the motor support is permanently deformed due to long-time abrasion, the output shaft of the motor is still inclined under the condition of external force, and a dead zone appears in a monitoring area or the monitoring cannot be used.

In addition, the monitoring and electronic eye has higher requirements on the aspects of space and running precision maintenance, when the axial movement of the output shaft is larger, the synchronous belt wheel is driven by the motor to move up and down, and in space, a customer needs to give way at the position, so that the monitoring and electronic eye has larger volume. When the axial movement of the output shaft is large, the two synchronous wheels are not on a plane, and the synchronous belt is inclined to cause large resistance or incomplete operation during operation. When the output shaft moves upwards, the contact area between the shaft head of the output shaft and the motor support is reduced, the external force applied to the output shaft is increased, the motor support is accelerated to wear, and the output shaft is inclined.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a step motor to the technical problem of the wearing and tearing speed of the motor support that slows down step motor in order to reduce the crooked probability of output shaft is solved.

A second object of the utility model is to provide a supervisory equipment to the technical problem of the wearing and tearing speed of the motor support that slows down step motor in order to reduce the crooked probability of output shaft is solved.

The utility model discloses a step motor realizes like this:

a stepper motor, comprising: the power assembly, a motor bracket connected with the power assembly and an output shaft assembly in transmission connection with the power assembly through the motor bracket; wherein

The output shaft assembly comprises an output shaft and an output gear fixedly arranged on the output shaft;

a positioning column matched with the output shaft is arranged on the motor support, and a positioning hole in clearance fit with the positioning column is formed in the end part, facing the motor support, of the output shaft; the output gear is fixedly connected with one end of the output shaft, which is provided with a positioning hole;

and one end of the output shaft, which is far away from the positioning hole, is fixedly connected with a synchronizing wheel.

In a preferred embodiment of the present invention, the output gear is connected to the output shaft by injection molding; and

at least one groove is milled on the side wall of the part of the output shaft connected with the output gear;

blocking portions protruding relative to the groove are formed at the top and bottom of the groove in a direction parallel to the axis of the output shaft, respectively.

In a preferred embodiment of the present invention, the power assembly and the motor bracket are both accommodated in a motor housing, and the motor housing includes a housing having an accommodating cavity and an open end, and a cover plate adapted to mate with the open end of the housing;

one end of the output shaft is accommodated in the accommodating cavity, and the other end of the output shaft penetrates through the cover plate and then extends out of the accommodating cavity;

the accommodating cavity is internally provided with a baffle frame which is suitable for separating the power assembly and the motor bracket;

the power assembly comprises a rotor assembly; one end of a rotating shaft of the rotor assembly is suitable for penetrating through the blocking frame and then extending to the motor support, and a rotating gear is fixed at the end part of the rotating shaft extending to the motor support.

In a preferred embodiment of the present invention, the one end of the cover plate facing the housing is flanged in a direction away from the housing to form a flanged hole, and a bearing is disposed in the flanged hole; the output shaft penetrates through the flanging hole after penetrating through the bearing; and

the bearing is in interference fit with the flanging hole.

In a preferred embodiment of the present invention, the output shaft is connected to the synchronizing wheel and has a cylindrical structure; and

the part of the output shaft connected with the synchronizing wheel is provided with a knurled part, and the synchronizing wheel is fixedly connected with the knurled part in a pressing mode so that the synchronizing wheel is in clearance fit with the output shaft.

In a preferred embodiment of the present invention, a reduction gear assembly is further disposed between the power assembly and the motor bracket;

the reduction gear assembly comprises a supporting frame suitable for being fixed with the blocking frame, a pair of first reduction gear sets symmetrically arranged and a pair of second reduction gear sets symmetrically arranged, wherein the first reduction gear sets are arranged on the supporting frame; wherein

Each pair of first reduction gear sets comprises a first large gear and a first small gear which are coaxially connected; each pair of second reduction gear sets comprises a second large gear and a second small gear which are coaxially connected;

the first small gear is meshed with the second large gear;

a through hole suitable for inserting the rotating gear penetrates through the supporting frame between the pair of first reduction gear sets; after being inserted into the through hole, the rotating gear is suitable for being meshed and connected with first large gears respectively included by the first reduction gear sets.

In a preferred embodiment of the present invention, the motor bracket includes a base body for connecting with an end surface of the supporting bracket away from the blocking bracket, and a positioning table provided on the base body for supporting the positioning column, wherein the positioning table forms a mating surface with the output gear when the motor bracket is coupled with the output shaft;

the end face, deviating from the positioning column, of the positioning table is also concavely provided with an accommodating hole suitable for accommodating the part of the rotating shaft, which protrudes from the rotating gear;

the base body is provided with a first pinion gear and a second pinion gear, the first pinion gear is arranged on the base body, the second pinion gear is arranged on the base body, the first pinion gear is arranged on the second reduction gear set, and the second pinion gear is arranged on the base body.

In an optional embodiment of the present invention, the depth of the positioning hole is greater than the height of the positioning column;

and a chamfer structure is arranged on the positioning table around the root part of the positioning column.

In the preferred embodiment of the present invention, a rib structure is further disposed on the end surface of the positioning stage away from the positioning column.

In an optional embodiment of the present invention, an annular concave groove is concavely provided along a radial outer peripheral side of the output shaft at a portion of the output shaft corresponding to the portion passing through the bearing, and a clamp spring is embedded in the annular concave groove;

the clamp spring is suitable for being limited between the side end face of the bearing, which deviates from the motor support, and the side end face of the flanging hole, which faces the motor support.

The utility model discloses a supervisory equipment realizes like this:

a monitoring device, comprising: the stepping motor.

By adopting the technical scheme, the utility model discloses beneficial effect once has: the utility model discloses a step motor and use this step motor's supervisory equipment, through the clearance fit of the locating hole of output shaft and motor support's reference column, can increase the locating hole of output shaft and motor support's reference column area of contact to the unit area who reduces motor support's reference column receives stress, can slow down step motor's motor support's the rate of wear like this, reduces motor support's wearing and tearing and makes the output shaft produce crooked probability.

Drawings

Fig. 1 is a schematic structural view of a stepping motor according to the present invention;

FIG. 2 is a sectional view of the cover plate and the bearing of the stepping motor of the present invention;

FIG. 3 is a sectional view of the cover plate of the stepping motor according to the present invention;

fig. 4 is an exploded view of an embodiment of the stepping motor according to the present invention;

fig. 5 is a schematic cross-sectional view of an embodiment of a stepping motor according to the present invention;

fig. 6 is a schematic structural view of a first viewing angle of the reduction gear assembly of the stepping motor according to the present invention;

fig. 7 is a schematic perspective view of a motor bracket of the stepping motor of the present invention;

fig. 8 is a schematic cross-sectional view of a motor bracket of the stepping motor according to the present invention;

fig. 9 is a schematic perspective view of an output shaft of the stepping motor of the present invention;

fig. 10 is a schematic cross-sectional view of an output shaft of the stepping motor according to the present invention;

fig. 11 is a schematic structural view of the output shaft of the stepping motor of the present invention in cooperation with the output gear;

fig. 12 is a schematic structural view of a second viewing angle of the reduction gear assembly of the stepping motor according to the present invention.

In the figure: the device comprises an output shaft 1, an output gear 2, a positioning column 3, a positioning hole 4, a synchronizing wheel 5, a groove 5, a blocking part 6, a motor shell 8, a cover plate 9, a blocking frame 10, a rotating gear 11, a flanging hole 13, a bearing 15, a knurled part 18, a supporting frame 19, a first large gear 21, a first small gear 22, a second large gear 23, a second small gear 25, a base body 26, a positioning table 27, an accommodating hole 28, a yielding groove 29, a rotating shaft 30, a chamfering structure 31, a reinforcing rib structure 32, an annular concave groove 33, a through hole 35 and a clamp spring 36.

Detailed Description

In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.

Example 1:

referring to fig. 1 to 12, the present embodiment provides a stepping motor, including: the power assembly, a motor bracket connected with the power assembly and an output shaft 1 assembly in transmission connection with the power assembly through the motor bracket; the output shaft 1 assembly comprises an output shaft 1 and an output gear 2 fixedly arranged on the output shaft 1; a positioning column 3 matched with the output shaft 1 is arranged on the motor support, and a positioning hole 4 in clearance fit with the positioning column 3 is arranged at the end part, facing the motor support, of the output shaft 1; the output gear 2 is fixedly connected with one end of the output shaft 1, which is provided with a positioning hole 4; one end of the output shaft 1 far away from the positioning hole 4 is fixedly connected with a synchronizing wheel 5. That is to say, the output shaft 1 achieves its rotation effect under the transmission action of the power assembly, and the synchronizing wheel 5 achieves synchronous rotation with the output shaft 1 under the action of the output shaft 1.

In the case of the present embodiment, the output gear 2 is connected to the output shaft 1 by injection molding; particularly, the output shaft 1 made of metal and the plastic wheel piece made into the output gear 2 are subjected to insert injection molding through an injection molding process, so that the cost is low, the precision of the output gear 2 subjected to injection molding is high, the plastic teeth and the plastic teeth of the output gear 2 are subjected to kneading abrasion and are small, the service life of the whole stepping motor is long, and the transmission is stable and the noise is low. Secondly, mill flat on the part's that output shaft 1 links to each other with output gear 2 lateral wall and have at least one recess 5, combine the attached drawing of this embodiment, set up to two on output shaft 1 recess 5, form "two flat" structure promptly, can prevent through "two flat" structure cooperation injection moulding process that the back is moulded plastics to output gear 2, the relative pivoted problem between output gear 2 and the output shaft 1 from taking place to produce to effectively guarantee step motor's normal operating.

In addition, in a further alternative case, stoppers 6 that are raised with respect to the groove 5 are formed at the top and bottom of the groove 5, respectively, in a direction parallel to the axis of the output shaft 1. The significance of the design of the blocking portion 6 here is that a limiting effect can be formed on the portion of the output gear 2 that is injection-molded in the groove 5, so that the integral output gear 2 that is integrally injection-molded can prevent the output gear 2 from being displaced in the axial direction relative to the output shaft 1 and even falling off when the output gear 2 is subjected to a force in a direction parallel to the axial direction of the output shaft 1.

In detail, the power assembly and the motor bracket are both accommodated in a motor housing 8, and the motor housing 8 includes a housing having an accommodating cavity and an open structure at one end, and a cover plate 9 adapted to be coupled with the open structure of the housing. One end of the output shaft 1 is accommodated in the accommodating cavity, and the other end of the output shaft passes through the cover plate 9 and then extends out of the accommodating cavity; in the receiving chamber there is a spacer 10 adapted to separate the power module from the motor support. Wherein the output shaft 1 can realize its own rotation relative to the cover plate 9, and the synchronizing wheel 5 of the embodiment is just positioned on the part of the output shaft 1 which extends out of the accommodating cavity after passing through the cover plate 9.

The power assembly of the present embodiment can be understood as a stepping motor body in the conventional technical means, that is, the power assembly includes a stator structure and a rotor assembly; one end of a rotating shaft 30 of the rotor assembly is adapted to penetrate through the barrier frame 10 and extend to the motor bracket, and a rotating gear 11 is fixed at the end of the rotating shaft 30 extending to the motor bracket, where the rotating gear 11 can rotate synchronously with the rotation of the rotating shaft 30. In order to improve the synchronization degree between the rotating gear 11 and the rotating shaft 30 during rotation, optionally, the rotating gear 11 and the rotor of the power assembly are integrally formed on the rotating shaft 30 by injection molding.

For the rotation of the output shaft 1 relative to the cover plate 9, in the embodiment, a flanging hole 13 is formed by flanging one end of the cover plate 9 facing the shell in the direction away from the shell, and a bearing 15 is arranged in the flanging hole 13; the output shaft 1 penetrates through the flanging hole 13 after penetrating through the bearing 15; wherein, the bearing 15 is in interference fit with the flanging hole 13. For the bearing 15 of the present embodiment, taking the deep groove ball bearing 15 as an example, the deep groove ball bearing 15 is pressed into the inner hole of the flanging hole 13 under the action of an external force, specifically, the flanging hole adopts a progressive die stamping process, the inner diameter size precision of the inner hole of the flanging hole 13 is high, and the inner diameter of the inner hole of the flanging hole 13 is smaller than the outer diameter of the deep groove ball bearing 15, so as to ensure that the deep groove ball bearing 15 and the flanging hole 13 are not easy to fall off after being crimped. When the deep groove ball bearing 15 is stressed, the cover plate 9 and the deep groove ball bearing 15 are integrated through the flanging hole 13 formed in the cover plate, and the structure can effectively disperse the external force applied to the deep groove ball bearing 15, so that the service life of the deep groove ball bearing 15 is prolonged. In addition, the depth of the flanging hole 13 is slightly larger than the axial length of the deep groove ball bearing 15, so that the crimping depth of the deep groove ball bearing 15 can be effectively guaranteed, the crimping depth of the output shaft 1 is stable, and the subsequent axial clearance of the output shaft 1 is easy to control. In summary, by the stable and effective cooperation of the deep groove ball bearing 15 and the flanging hole 13, the skew of the output shaft 1 passing through the deep groove ball bearing 15 can be reduced.

For the cover plate 9 of this embodiment, it should be noted that the cover plate 9 is made of a progressive die, and the size precision of the part is high, and the cost is low. First, the cover plate 9 may be made of, for example, but not limited to, steel SECC or SECD. Preferably, the steel SECC-N5 is selected, and the material has excellent corrosion resistance, environmental protection, cold rolling property, easy processing formability and good dimensional stability. Secondly, the cover plate 9 can be made of a plate with a thickness of 0.6mm to 1.2mm, preferably 1mm, so that the plate is thick and can bear large stress after the flanging hole 13 is punched out. When the flanging hole 13 integrally formed on the cover plate 9 is in interference crimping with the deep groove ball bearing 15, the plate material of the cover plate 9 is thick, so that the flanging hole 13 of the cover plate 9 is not deformed after the crimping.

In order to facilitate the assembly of the output shaft 1 and the synchronizing wheel 5, the inner ring structure of the synchronizing wheel 5 is circular, and the part of the output shaft 1 connected with the synchronizing wheel 5 is in a cylindrical structure, so that the matching of the circle and the circle does not need to confirm the direction, and only the output shaft 1 is directly pressed and connected with the synchronizing wheel 5. It should be noted here that, for the material used for manufacturing the output shaft 1, free-cutting steel is used and nickel plating is performed, the output shaft 1 is made of low-carbon easy-cutting steel with a carbon content of 30% or less, preferably Y15Pb steel, the free-cutting steel has good processing performance, stable chemical components, stable processing, and good electroplating performance, and compared with materials such as stainless steel, the cost is low, and the manufacturing accuracy and the surface quality of the output shaft 1 are ensured.

In addition, the part of the output shaft 1 connected with the synchronizing wheel 5 is provided with a knurled part 18, and the synchronizing wheel 5 is fixed on the knurled part 18 in a pressing way so that the synchronizing wheel 5 is in clearance fit with the output shaft 1. When the synchronizing wheel 5 is in compression joint with the output shaft 1, the knurled part 18 deforms, so that the output shaft 1 and the synchronizing wheel 5 are in interference fit, and the synchronizing wheel 5 is guaranteed not to fall off in the operation process.

It should be noted that, for the stepping motor of this embodiment, a reduction gear assembly is further disposed between the power assembly and the motor bracket. Specifically, the reduction gear assembly comprises a supporting frame 19 which is suitable for being fixedly connected with the blocking frame 10, and a pair of first reduction gear sets which are symmetrically arranged and a pair of second reduction gear sets which are symmetrically arranged are arranged on the supporting frame 19; each of the pair of first reduction gear sets includes a first large gear 21 and a first small gear 22 which are coaxially connected; each of the pair of second reduction gear sets includes a second large gear 23 and a second small gear 25 which are coaxially connected; the first small gear 22 meshes with the second large gear 23; a through hole 35 adapted to the insertion of the rotation gear 11 is perforated in the supporting frame 19 between the pair of first reduction gear sets; the rotary gear 11 inserted into the through hole 35 is adapted to be simultaneously engaged with the first large gears 21 included in the pair of first reduction gear sets, respectively.

That is, the coaxial structure of the first large gear 21 and the first small gear 22 allows the first small gear 22 to achieve synchronous rotation with respect to the first large gear 21, and similarly, the coaxial structure of the second large gear 23 and the second small gear 25 allows the second small gear 25 to achieve synchronous rotation with respect to the second large gear 23. After the rotating gear 11 passes through the through hole, the rotating gear 11 is placed in an interval formed by the first large gears 21 included in the pair of first reduction gear sets, and due to the meshing connection relationship between the rotating gear 11 and the first large gears 21 included in the pair of first reduction gear sets, the first large gears 21 included in the pair of first reduction gear sets respectively rotate under the action of the rotating gear 11, and at this time, the first small gears 22 included in the pair of first reduction gear sets respectively can also rotate. Under the meshing action of the first small gear 22 and the second large gear 23, the rotation of the first small gear 22 can drive the second large gear 23 to rotate, and thus, the corresponding rotation effect is realized under the coaxial structure of the second small gear 25 and the second large gear 23. Thus, due to the meshed connection relationship between the output gear 2 on the output shaft 1 and the second pinions 25 respectively included in the pair of second reduction gear sets, the rotation of the second pinions 25 is caused to have a driving effect on the rotation of the output gear 2, and the integrated injection molding structure of the output shaft 1 and the output gear 2 is caused to allow the output shaft 1 to rotate along with the rotation of the output gear 2.

In more detail, the motor bracket comprises a base body 26 used for connecting with the end face of the supporting frame 19 departing from the baffle frame 10, and a positioning table 27 arranged on the base body 26 and used for supporting the positioning column 3, wherein when the motor bracket is matched and connected with the output shaft 1, the positioning table 27 forms a matching surface with the output gear 2; the end surface of the positioning platform 27 facing away from the positioning column 3 is further concavely provided with a receiving hole 28 suitable for receiving a part of the rotating shaft 30 protruding from the rotating gear 11, and the inner diameter of the receiving hole 28 is larger than the outer diameter of the rotating shaft 30. Furthermore, a relief groove 29 adapted to relief the first pinion gears 22 respectively included in a pair of first reduction gear sets is provided on the base body 26 around the positioning table 27. That is to say, the positioning column 3 of the motor support realizes the axial supporting effect on the output shaft 1, so that under the transitional effect of the reduction gear assembly, the rotation of the output shaft 1 is realized by the transmission of the power assembly.

It should be noted that the depth of the positioning hole 4 is greater than the height of the positioning column 3, so that a gap is formed between the output shaft 1 and the motor support after assembly, and the motor support is matched with the positioning hole 4 of the output shaft 1 through the positioning column 3, so that the force arm can be shortened, and the stress on the positioning column 3 is reduced. This time, through the external diameter of increase reference column 3, increase the height of reference column 3 simultaneously, can effectively increase output shaft 1's locating hole 4 and reference column 3's area of contact, reduce reference column 3 unit area and receive stress.

In addition, in an optional implementation case, a chamfering structure 31 is further arranged on the positioning table 27 around the root of the positioning column 3, and on one hand, the chamfering structure 31 can increase the strength of the positioning column 3 and prevent the root of the positioning column 3 from being broken due to stress concentration. On the other hand, the chamfer structure 31 is formed to give way, so that the position of the output shaft 1 corresponding to the chamfer structure 31 does not need to be chamfered, and the contact area can be increased.

Under the optional embodiment, motor support is under the no interference condition of the rotation of countershaft 30, still is equipped with strengthening rib structure 32 at the terminal surface that location platform 27 deviates from reference column 3, and strengthening rib structure 32 adopts for example but not limiting to the splayed structure, and it can effectively guarantee when output shaft 1 receives the axial force here to increase strengthening rib structure 32, and location platform 27 is difficult for taking place to deform, improves the stability of its structure. When the output shaft 1 is subjected to an axial external force, the output shaft 1 presses the positioning table 27 of the motor support, and the reinforcing rib structure 32 added to the positioning table 27 can effectively ensure that the positioning table 27 is not easy to break when the output shaft 1 is subjected to a larger axial external force.

It should be noted that, in an alternative embodiment, in view of further reducing the axial play of the output shaft 1 and increasing the radial force borne by the output shaft 1, so as to reduce the skew probability of the output shaft 1, when the output shaft 1 is coupled with the motor bracket, the axial fit clearance formed between the output gear 2 and the positioning table 27 is controlled to be less than 0.1mm, where the axial clearance of the output shaft 1 is the sum of the vertical displacements of the output shaft 1 along the axial direction.

In order to effectively ensure that the axial fit clearance formed between the output gear 2 and the positioning table 27 is less than 0.1mm, an annular concave groove 33 is concavely arranged on the part of the output shaft 1 corresponding to the part passing through the bearing 15 along the radial outer peripheral side of the output shaft 1, and a clamp spring 36 is embedded in the annular concave groove 33; the clamp spring 36 is suitable for being limited between the side end face of the bearing 15, which is away from the motor bracket, and the side end face of the flanging hole 13, which faces the motor bracket. The width of the groove 5 is larger than the thickness of the clamp spring 36 by within 0.1mm, so that when the clamp spring 36 is assembled in the groove 5 of the output shaft 1, the lower surface of the clamp spring 36 departing from the synchronizing wheel 5 is in contact with the upper surface of the deep groove ball bearing 15 facing the synchronizing wheel 5, and the gap between the lower surface of the deep groove ball bearing 15 departing from the synchronizing wheel 5 and the upper surface of the output gear 2 facing the synchronizing wheel 5 is within 0.1 mm. After the snap spring 36 is arranged in the annular concave groove 33, when the output shaft 1 is pulled outwards in the direction away from the outer side of the motor support, the upper surface of the deep groove ball bearing 15 facing the synchronizing wheel 5 is tightly attached to the lower surface of the snap spring 36, the downward displacement of the output shaft 1 is 0, and the upward displacement of the output shaft 1 is the gap between the deep groove ball bearing 15 and the output gear 2, so that the gap between the deep groove ball bearing 15 and the output gear 2 is controlled to be within 0.1mm, and the axial fit gap formed between the output gear 2 and the positioning table 27 can be smaller than 0.1 mm.

Example 2:

on the basis of the stepping motor of embodiment 1, the present embodiment provides a monitoring apparatus including: the stepping motor of embodiment 1.

The above embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above embodiments are only examples of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the mechanism or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the present disclosure, unless otherwise expressly stated or limited, the first feature may comprise both the first and second features directly contacting each other, and also may comprise the first and second features not being directly contacting each other but being in contact with each other by means of further features between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.

Claims

1. A stepping motor, comprising: the power assembly, a motor bracket connected with the power assembly and an output shaft assembly in transmission connection with the power assembly through the motor bracket; wherein

2. The stepper motor of claim 1, wherein the output gear is injection molded with the output shaft; and

3. The stepper motor as claimed in claim 1, wherein the power assembly and the motor bracket are both accommodated in a motor housing, the motor housing comprises a housing having an accommodating cavity and an open structure at one end, and a cover plate adapted to mate with the open structure of the housing;

4. The stepping motor according to claim 3, wherein one end of the cover plate facing the housing is flanged in a direction away from the housing to form a flanged hole, and a bearing is arranged in the flanged hole; the output shaft penetrates through the flanging hole after penetrating through the bearing; and

the bearing is in interference fit with the flanging hole.

5. The stepper motor of claim 3, wherein the output shaft is connected to the synchronizing wheel in a part-cylindrical configuration; and

6. The stepper motor of claim 4, wherein a reduction gear assembly is further provided between the power assembly and the motor bracket;

the first small gear is meshed with the second large gear;

7. The stepping motor according to claim 6, wherein the motor bracket comprises a base body for connecting with an end surface of the support frame facing away from the barrier frame, and a positioning table provided on the base body for supporting the positioning column, wherein the positioning table forms a matching surface with the output gear when the motor bracket is matched with the output shaft;

8. The stepper motor of claim 7, wherein the depth of the positioning hole is greater than the height of the positioning post;

9. The stepping motor of claim 8, wherein a rib structure is further disposed on an end surface of the positioning table away from the positioning post.

10. The stepping motor according to claim 7, wherein an annular recess groove is concavely provided along a radially outer peripheral side of the output shaft at a portion of the output shaft corresponding to the bearing through which the output shaft passes, and a snap spring is fitted in the annular recess groove;

11. A monitoring device comprising a stepper motor as claimed in any one of claims 1 to 10.