Fixed shaft type stepping motor with lubricating assembly

Abstract

The utility model relates to the technical field of stepping motors, in particular to a fixed shaft type stepping motor with a lubricating assembly, which comprises a front end cover, a rear end cover, an extension sleeve, an output shaft assembly, the lubricating assembly, a stator and a rotating shaft, the rotating shaft is arranged on the inner side of the stator, and the extension sleeve is connected with the front end cover. The output shaft assembly comprises a lead screw, a spline shaft, a guide sleeve and a middle piece, the lead screw is in spiral transmission connection with the rotating shaft, the guide sleeve is arranged in the extension sleeve, one end of the spline shaft is fixedly connected with the lead screw, the other end of the spline shaft is matched with the guide sleeve, and the middle piece is arranged on the spline shaft; the guide sleeve is provided with a containing groove internally provided with solid lubricating grease and semi-circular ring extrusion pieces, the spline shaft makes contact with the solid lubricating grease, the two semi-circular ring extrusion pieces are movably installed on the two sides of the solid lubricating grease, and the extrusion rod is movably arranged on the middle piece. The advantage that lubrication can be achieved without exposing the spline shaft is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stepping motor, more particularly to a fixed shaft type stepping motor with lubricating assembly. BACKGROUND

[0002] Stepping motor is a kind of motor that converts electrical pulse signals into corresponding angular displacement or linear displacement, and the rotor rotates an angle or moves forward one step for each input pulse signal.

[0003] Patent document (CN219322187U) discloses a fixed shaft type stepping motor, which comprises a stator assembly, a rotor assembly, a front cover, a rear cover, a lead screw and a spline shaft fixed with the lead screw. The rotor assembly is formed with an inner hole having an internal thread. The lead screw is threadedly connected with the rotor assembly. The spline shaft can only move axially due to the limitation of the spline nut on the front cover. When the rotor assembly rotates, the lead screw moves axially and drives the spline shaft to move axially reciprocally. However, the spline shaft reciprocally rubs against the spline nut, which results in fast wear and high noise. The existing method is to first expose the spline shaft and then apply lubricating liquid on the surface of the spline shaft. When the spline shaft is not fully exposed, the staff needs to expose the spline shaft to complete the lubrication work. Moreover, the lubricating liquid only has a thin layer, and the lubrication time is short.

[0004] Therefore, there is a need to provide a fixed shaft type stepping motor with lubricating assembly, which facilitates lubrication without exposing the spline shaft and is more convenient. CONTENT OF THE UTILITY MODEL

[0005] The application aims to provide a fixed shaft stepping motor with a lubricating assembly. The fixed shaft stepping motor with the lubricating assembly comprises an electromagnetic assembly, an end cover assembly, a positioning sleeve assembly, an output shaft assembly and a lubricating assembly. The electromagnetic assembly comprises a stator and a rotor assembly. The rotor assembly is arranged on the inner side of the stator. The end cover assembly comprises a front end cover and a rear end cover. The electromagnetic assembly is located between the front end cover and the rear end cover. The rotor assembly comprises a rotating shaft. The rotating shaft is rotatably arranged on the end cover assembly. The positioning sleeve assembly comprises an extension sleeve. The extension sleeve is connected with the front end cover. The output shaft assembly comprises a screw rod, a spline shaft, a guide sleeve and an intermediate piece. The screw rod is arranged through the rotating shaft and is in screw transmission connection with the rotating shaft. The guide sleeve is fixedly arranged in the extension sleeve. One end of the spline shaft is fixedly connected with the screw rod. The other end of the spline shaft is arranged through the guide sleeve and is in cooperation with the spline groove on the guide sleeve. The intermediate piece is arranged on the end of the spline shaft away from the screw rod. The lubricating assembly comprises two half-ring extrusion pieces and two extrusion rods. The end of the guide sleeve close to the intermediate piece is provided with a containing groove. The containing groove is provided with solid lubricating grease and the half-ring extrusion piece. The spline surface of the spline shaft is in contact with the inner side of the solid lubricating grease. The two half-ring extrusion pieces are movably arranged on the two sides of the solid lubricating grease. The two extrusion rods are movably arranged on the intermediate piece. When the extrusion rod moves to the direction of the half-ring extrusion piece and is in contact with the half-ring extrusion piece, the half-ring extrusion piece moves towards each other and extrudes the solid lubricating grease. The solid lubricating grease is arranged outside the spline shaft. The half-ring extrusion piece extrudes the solid lubricating grease by the movement of the extrusion rod. Compared with the prior art, the lubrication can be realized without exposing the spline shaft, and the lubrication is more convenient.

[0006] Another purpose of the application is to provide a fixed shaft stepping motor with a lubricating assembly. The end of the half-ring extrusion piece away from the front end cover is provided with an anti-extrusion ring. The anti-extrusion ring is arranged to prevent the solid lubricating grease from being taken out of the containing groove by the spline shaft in the movement process.

[0007] In order to achieve the above-mentioned at least one application purpose, the application provides a fixed shaft stepping motor with a lubricating assembly. The fixed shaft stepping motor with the lubricating assembly comprises:

[0008] An electromagnetic assembly, the electromagnetic assembly comprises a stator and a rotor assembly, the rotor assembly is arranged on the inner side of the stator; and

[0009] An end cover assembly, the end cover assembly comprises a front end cover and a rear end cover, the electromagnetic assembly is located between the front end cover and the rear end cover, the rotor assembly comprises a rotating shaft, the rotating shaft is rotatably arranged on the end cover assembly; and

[0010] A positioning sleeve assembly, comprising an extension sleeve connected with the front end cover; and

[0011] An output shaft assembly, comprising a screw rod, a spline shaft, a guide sleeve and an intermediate piece, the screw rod is arranged in the rotating shaft and connected with the rotating shaft in a screw transmission mode, the guide sleeve is fixedly arranged in the extension sleeve, one end of the spline shaft is fixedly connected with the screw rod, the other end of the spline shaft is arranged in the guide sleeve and matched with the spline groove on the guide sleeve, and the intermediate piece is arranged on the end of the spline shaft away from the screw rod; and

[0012] A lubricating assembly, comprising two semi-circular ring extruding pieces and two extruding rods, one end of the guide sleeve close to the intermediate piece is provided with a containing groove, the containing groove is provided with solid lubricating grease and the semi-circular ring extruding pieces, the spline surface of the spline shaft is in contact with the inner side of the solid lubricating grease, the two semi-circular ring extruding pieces are movably arranged on the two sides of the solid lubricating grease, and the two extruding rods are movably arranged on the intermediate piece, when the extruding rods move towards the semi-circular ring extruding pieces and are in contact with the semi-circular ring extruding pieces, the semi-circular ring extruding pieces move towards each other and extrude the solid lubricating grease.

[0013] In one or more embodiments of the present application, one end of the two semi-circular ring extruding pieces away from each other is provided with a bevel, and one end of the two extruding rods close to the guide sleeve is provided with a spherical surface, when the screw rod moves axially, the spherical surface is in abutment or separation with the bevel.

[0014] In one or more embodiments of the present application, the lubricating assembly further comprises a plurality of elastic pieces, one end of each of the semi-circular ring extruding pieces is connected with one of the elastic pieces, and the other end of the elastic piece is fixedly connected with the guide sleeve.

[0015] In one or more embodiments of the present application, the intermediate piece is detachably connected with the guide sleeve, one end of the intermediate piece away from the guide sleeve is provided with a connecting part, and the extruding rods are located outside the connecting part.

[0016] In one or more embodiments of the present application, one end of each of the extruding rods away from the spherical surface is provided with a screw groove.

[0017] In one or more embodiments of the present application, the middle section of the front end cover is provided with a through hole, one end of the through hole away from the rear end cover is provided with a first threaded part, one end of the extension sleeve close to the front end cover is provided with a second threaded part, and the front end of the second threaded part extends into the through hole and is threadedly connected with the first threaded part.

[0018] In one or more embodiments of the present application, the positioning sleeve assembly further comprises a nut, the nut is sleeved on the extension sleeve, and the nut is threadedly connected with the rear end of the second threaded portion, and the nut abuts against the front end cover.

[0019] In one or more embodiments of the present application, the spline shaft is provided with an anti-disengagement portion near one end of the screw rod, the maximum radial dimension of the anti-disengagement portion is greater than the maximum radial dimension of the rest of the spline shaft.

[0020] In one or more embodiments of the present application, the half-ring extrusion member is provided with an anti-disengagement ring at one end away from the front end cover.

[0021] In the embodiment of the present application, the fixed-shaft stepping motor with lubricating assembly comprises an end cover assembly, an extension sleeve, an output shaft assembly, a lubricating assembly, a stator and a rotating shaft, the rotating shaft is rotatably installed on the end cover assembly and arranged inside the stator, the end cover assembly comprises a front end cover and a rear end cover, the extension sleeve is connected with the front end cover, the output shaft assembly comprises a screw rod, a spline shaft, a guide sleeve and an intermediate piece, the screw rod penetrates through the rotating shaft and is in screw transmission connection with the rotating shaft, the guide sleeve is fixedly installed in the extension sleeve, one end of the spline shaft is fixedly connected with the screw rod, the other end is in mutual cooperation with a spline groove on the guide sleeve, the intermediate piece is installed on the spline shaft, the lubricating assembly comprises two half-ring extrusion members and two extrusion rods, the guide sleeve is provided with a containing groove, the containing groove is provided with solid lubricating grease and the half-ring extrusion members, the spline surface of the spline shaft is in contact with the inner side of the solid lubricating grease, the two half-ring extrusion members are movably installed on the two sides of the solid lubricating grease, the two extrusion rods are movably installed on the intermediate piece, when the extrusion rod moves towards the half-ring extrusion member and is in contact with the half-ring extrusion member, the half-ring extrusion member moves towards the other and extrudes the solid lubricating grease, by arranging the solid lubricating grease outside the spline shaft, and by moving the extrusion rod to realize the extrusion of the solid lubricating grease by the half-ring extrusion member, compared with the prior art, the lubrication can be realized without exposing the spline shaft, and the lubrication is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0022] These and / or other aspects and advantages of the present application will become more apparent and more readily appreciated from the following detailed description of the embodiments of the present application, taken in conjunction with the accompanying drawings in which:

[0023] Figure 1 Fig. 1 shows a structural schematic view of a fixed-shaft stepping motor with lubricating assembly according to the present application;

[0024] Figure 2 Fig. 2 shows a partial enlarged view of the C in Fig. 1; Figure 1

[0025] Figure 3 Fig. 4 shows a structural schematic view of the lubricating assembly from another angle. DETAILED DESCRIPTION ​

[0026] The terms and words used in the following description and claims are not limited to the

[0027] It is to be understood that the terms "one", "another", "an" and "a" are not limited to one individual or to one or more of you. Rather, the terms are used interchangeably to include one or more than one, unless the context clearly dictates otherwise.

[0028] Although ordinal numbers such as "first", "second" and the like will be used in describing various components, those components are not limited by the ordinal numbers. The ordinal numbers are used merely to distinguish a component from another. For example, a first component can be termed as a second component, and likewise, a second component can be termed as a first component without departing from the teachings of the present inventive concept. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular form "a", "an" and "the" is intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "has", when used in this specification, specify the presence of stated features, integers, steps, operations, components, elements, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, elements, or combinations thereof.

[0030] An illustrative fixed-shaft stepper motor with a lubricating assembly, with reference to Figures 1 to 3 A fixed-shaft stepper motor with a lubricating assembly according to a preferred embodiment of the present application comprises an electromagnetic assembly 10, an end cover assembly 20, a locating sleeve assembly 30 and an output shaft assembly 40.

[0031] In particular, as Figure 1As shown, the electromagnetic assembly 10 comprises a stator 101 and a rotor assembly (not labeled in the figure) arranged inside the stator 101; in addition, the end cover assembly 20 comprises a front end cover 201 and a rear end cover 202, the electromagnetic assembly 10 is located between the front end cover 201 and the rear end cover 202, the rotor assembly comprises a rotating shaft 102 and a rotor core (not labeled in the figure), the rotating shaft 102 is rotatably installed on the end cover assembly 20, and the rotor core is sleeved outside the rotating shaft 102 and is rigidly connected and synchronously rotated with the rotating shaft 102; in addition, the positioning sleeve assembly 30 comprises an extension sleeve 301, the extension sleeve 301 is connected with the front end cover 201; in addition, the output shaft assembly 40 comprises a lead screw 401, a spline shaft 402, a guide sleeve 403 and an intermediate piece 404, the lead screw 401 penetrates through the rotating shaft 102 and is in screw transmission connection with the rotating shaft 102, the guide sleeve 403 is fixedly installed in the extension sleeve 301, one end of the spline shaft 402 is fixedly connected with the lead screw 401, the other end of the spline shaft 402 penetrates through the guide sleeve 403 and is matched with the spline groove on the guide sleeve 403, and the intermediate piece 404 is installed at the end of the spline shaft 402 away from the lead screw 401.

[0032] It should be noted that the stator 101 is provided with a coil, the stator 101 is installed and positioned through the front end cover 201 and the rear end cover 202, and the rotating shaft 102 is rotatably installed on the end cover assembly 20 through the bearings installed on the front end cover 201 and the rear end cover 202; when the coil on the stator 101 is electrified, the rotating shaft 102 rotates circumferentially under the action of magnetic force, since the two ends of the rotating shaft 102 are matched with the corresponding bearings, the position of the rotating shaft 102 is fixed in the axial direction, and since the lead screw 401 is in screw transmission connection with the rotating shaft 102, the lead screw 401 is fixedly connected with the spline shaft 402, and the spline shaft 402 can only move axially under the limitation of the guide sleeve 403, the rotating shaft 102 rotating circumferentially will drive the lead screw 401 to move axially, and drive the spline shaft 402 and the intermediate piece 404 installed on the spline shaft 402 to move axially, one end of the intermediate piece 404 away from the spline shaft 402 is connected with an external execution mechanism, and by rotating the rotating shaft 102 in the clockwise or counterclockwise direction, the reciprocating axial movement of the external execution mechanism is realized.

[0033] It is obvious that in the above process, the spline shaft 402 and the guide sleeve 403 are in sliding friction. The existing method is only to smear a layer of lubricating liquid on the spline shaft 402. After a short period of use, the wear and abnormal sound at the spline shaft 402 are more serious due to the rapid consumption of the lubricating liquid. At this time, in order to reduce the wear, the staff needs to first make the coil electrified and make the spline shaft 402 protrude out of the guide sleeve 403 by a predetermined distance, then make the coil de-energized, so that the spline shaft 402 is maintained in the state of protruding out, and then smears a layer of lubricating liquid. Under the condition of long-term continuous work, the staff needs to repeat the above steps of first making the spline shaft 402 protrude and then smearing the lubricating liquid for many times, which is more cumbersome and inconvenient.

[0034] In view of this, in the embodiment of the present application, as shown in Figure 2 and Figure 3 The fixed shaft type stepping motor with a lubricating assembly further comprises a lubricating assembly 50. The lubricating assembly 50 comprises two half-ring extrusion members 501 and two extrusion rods 502. The guide sleeve 403 has a containing groove 4031 near one end of the intermediate member 404. The containing groove 4031 is internally provided with solid lubricating grease 503 and the half-ring extrusion members 501. The spline surface of the spline shaft 402 is in contact with the inner side of the solid lubricating grease 503. The two half-ring extrusion members 501 are movably installed on the two sides of the solid lubricating grease 503. The two extrusion rods 502 are movably installed on the intermediate member 404. When the extrusion rods 502 move towards the half-ring extrusion members 501 and are in contact with the half-ring extrusion members 501, the half-ring extrusion members 501 move towards each other and extrude the solid lubricating grease 503.

[0035] It should be noted that by setting a certain storage amount of the solid lubricating grease 503 on the outer side of the spline shaft 402 and setting the extrusion rods 502 penetrating through the intermediate member 404, when the spline shaft 402 relatively slides along the guide sleeve 403 for a predetermined number of times and the solid lubricating grease 503 in direct contact with the spline shaft 402 is consumed, the operator only needs to rotate the extrusion rods 502 by a predetermined angle. Then the extrusion rods 502 further move towards the half-ring extrusion members 501 by a predetermined distance, and the half-ring extrusion members 501 move towards the central axis of the spline shaft 402 and push the solid lubricating grease 503 which originally has a gap with the side wall of the spline shaft 402 to fit the side wall of the spline shaft 402 again. This action does not need to consider whether the spline shaft 402 is exposed at this moment. Compared with the prior art which must smear the lubricating liquid when the spline shaft 402 is exposed, the present application has the advantages of lubrication without exposing the spline shaft and more convenient lubrication.

[0036] Further, as shown in Figure 1As shown, the intermediate piece 404 is detachably connected with the guide sleeve 403, and the end of the intermediate piece 404 away from the guide sleeve 403 has a connecting portion 4041 with external threads, and the extrusion rod 502 is located outside the connecting portion 4041.

[0037] It should be noted that when the solid lubricant 503 in the accommodating groove 4031 is almost used up, the intermediate piece 404 can be detached and a complete solid lubricant 503 is reinstalled. In addition, by setting the detachable intermediate piece 404, the size of the external actuator can be adapted to replace the intermediate piece 404 of the corresponding specification.

[0038] Further, in order to realize the movement of the extrusion rod 502 to the direction of the semi-circular ring extrusion piece 501, the semi-circular ring extrusion piece 501 moves to the direction of the central axis of the spline shaft 402, as shown in Figure 2 and Figure 3 As shown, the opposite ends of the two semi-circular ring extrusion pieces 501 each have a bevel 5011, and the end of the two extrusion rods 502 close to the guide sleeve 403 each has a spherical surface (not marked in the figure), when the screw rod 401 moves axially, the spherical surface abuts or separates from the bevel 5011, when the spherical surface abuts the bevel 5011 and the extrusion rod 502 is further screwed in and moves to the direction of the front end cover 201, the spherical surface exerts a component force on the bevel 5011 to move to the direction of the central axis of the spline shaft 402.

[0039] Further, as shown in Figure 3 The lubricating assembly 50 further comprises a plurality of elastic members 504, each of the two ends of the semi-circular ring extrusion piece 501 has an ear portion, and each of the ear portions is connected with an elastic member 504, and the other end of the elastic member 504 is fixedly connected with the guide sleeve 403, and the fixed connection manner includes but is not limited to welding.

[0040] It should be noted that by setting the elastic member 504, when the spline shaft 402 extends away from the rear end cover 202, since the extrusion rod 502 extends with the intermediate member 404, at this time the extrusion rod 502 is no longer in contact with the inclined surface 5011, then the two semicircular ring extrusion members 501 reset to the initial state under the elastic force of the elastic member 504 until the spline shaft 402 retreats to the initial position again, which avoids the phenomenon that the solid lubricating grease 503 is excessively contacted with the spline shaft 402 in motion and waste is generated due to the thrust of the semicircular ring extrusion member 501 during the extension of the spline shaft 402; in addition, by setting the elastic member 504, the semicircular ring extrusion member 501 is also prevented from being separated from the accommodating groove 4031.

[0041] Further, in order to facilitate the screwing of the extrusion rod 502, referring to Figure 2 each end of the extrusion rod 502 away from the spherical surface has a screwing groove (not marked in the figure), and the screwing groove includes but is not limited to a regular hexagonal groove.

[0042] Further, in order to realize the connection of the extension sleeve 301 and the front end cover 201, as shown in Figure 1 the middle section of the front end cover 201 has a through hole 2011, one end of the through hole 2011 away from the rear end cover 202 has a first threaded portion (not marked in the figure), one end of the extension sleeve 301 close to the front end cover 201 has a second threaded portion (not marked in the figure), and the front end of the second threaded portion extends into the through hole 2011 and is threadedly connected with the first threaded portion.

[0043] In addition, as shown in Figure 1 the positioning sleeve assembly 30 further includes a nut 302, the nut 302 is sleeved on the extension sleeve 301, and the nut 302 is threadedly connected with the rear end of the second threaded portion, and the nut 302 abuts against the front end cover 201.

[0044] Further, in order to avoid the separation of the lead screw 401 and the rotating shaft 102, as shown in Figure 1 one end of the spline shaft 402 close to the lead screw 401 has an anti-separation portion 4021, the maximum radial dimension of the anti-separation portion 4021 is greater than the maximum radial dimension of the rest of the spline shaft 402, and when the spline shaft 402 moves along the axis, the anti-separation portion 4021 reciprocates between the bearings on the guide sleeve 403 and the front end cover 201.

[0045] Further, in order to avoid the separation of the solid lubricating grease 503 from the accommodating groove 4031 during the axial movement of the spline shaft 402, as shown inFigure 2 As shown, the half circular ring extrusion piece 501 is provided with an anti-off ring 405 at one end away from the front end cover 201. Specifically, the half circular ring extrusion piece 501 is provided with a plurality of convex columns 5012 arranged in an annular array at one end away from the front end cover 201, and the anti-off ring 405 is provided with a plurality of insertion holes 4051, each of which is fitted with one of the convex columns 5012 in an interference fit, so as to fix the anti-off ring 405 on the half circular ring extrusion piece 501. When it is necessary to place new solid lubricating grease 503, the anti-off ring 405 can be first lifted out, and then the solid lubricating grease 503 can be placed.

[0046] In summary, the fixed-shaft stepping motor with lubricating assembly according to the embodiments of the present application is illustrated, which provides the fixed-shaft stepping motor with lubricating assembly with the advantages of facilitating lubrication without exposed spline shaft, more convenient lubrication, and the like.

[0047] It is worth mentioning that, in the embodiments of the present application, the fixed-shaft stepping motor with lubricating assembly has simple structure, does not involve complex manufacturing process and expensive materials, and has high economy. Meanwhile, for the manufacturers, the fixed-shaft stepping motor with lubricating assembly provided by the present application is easy to produce and has low cost, which is more conducive to controlling the production cost, and is further conducive to product promotion and use.

[0048] Those skilled in the art should understand that the embodiments of the present application described above and shown in the drawings are only examples and do not limit the present application. The purpose of the present application has been completely and effectively achieved. The function and structural principle of the present application have been demonstrated and explained in the embodiments, and the implementation of the present application can be any deformation or modification without departing from the principle.

Claims

1. A fixed-shaft stepper motor with a lubrication assembly, characterized by: The fixed-shaft stepping motor with a lubricating assembly comprises an electromagnetic assembly comprising a stator and a rotor assembly arranged inside the stator; and an end cover assembly comprising a front end cover and a rear end cover, the electromagnetic assembly being arranged between the front end cover and the rear end cover, the rotor assembly comprising a rotating shaft rotatably arranged on the end cover assembly; and a locating sleeve assembly comprising an extension sleeve connected to the front end cover; and an output shaft assembly comprising a screw rod, a spline shaft, a guide sleeve and an intermediate piece, the screw rod being arranged through the rotating shaft and being in screw transmission connection with the rotating shaft, the guide sleeve being fixedly arranged in the extension sleeve, one end of the spline shaft being fixedly connected to the screw rod, the other end of the spline shaft being arranged through the guide sleeve and being in mutual cooperation with a spline groove on the guide sleeve, the intermediate piece being arranged on the end of the spline shaft away from the screw rod; and a lubricating assembly comprising two half-ring extruding pieces and two extruding rods, one end of the guide sleeve close to the intermediate piece being provided with a containing groove, the containing groove being provided with solid lubricating grease and the half-ring extruding pieces, the spline surface of the spline shaft being in contact with the inside of the solid lubricating grease, the two half-ring extruding pieces being movably arranged on the two sides of the solid lubricating grease, the two extruding rods being movably arranged on the intermediate piece, when the extruding rods move towards the half-ring extruding pieces and are in contact with the half-ring extruding pieces, the half-ring extruding pieces move towards each other and extrude the solid lubricating grease.

2. The fixed-shaft stepper motor with a lubricating assembly according to claim 1, characterized in that: The end of the half-ring extruding piece away from the other half-ring extruding piece is provided with a bevel, and the end of the extruding rod close to the guide sleeve is provided with a spherical surface, when the screw rod moves axially, the spherical surface is in abutment or separation with the bevel.

3. The fixed-shaft stepper motor with a lubricating assembly according to claim 2, characterized in that: The lubricating assembly further comprises a plurality of elastic pieces, one end of each half-ring extruding piece being connected to one elastic piece, and the other end of the elastic piece being fixedly connected to the guide sleeve.

4. The fixed-shaft stepper motor with a lubricating assembly according to claim 3, characterized in that: The intermediate piece is detachably connected to the guide sleeve, one end of the intermediate piece away from the guide sleeve is provided with a connecting part, and the extruding rod is located outside the connecting part.

5. The fixed-shaft stepper motor with a lubricating assembly according to any one of claims 2-4, characterized in that: One end of each extruding rod away from the spherical surface is provided with a screw groove.

6. The fixed-shaft stepper motor with lubricating assembly according to any one of claims 1-4, characterized in that: The middle section of the front end cover is provided with a through hole, one end of the through hole away from the rear end cover is provided with a first threaded part, one end of the extension sleeve close to the front end cover is provided with a second threaded part, the front end of the second threaded part extends into the through hole and is in threaded connection with the first threaded part.

7. The fixed-shaft stepper motor with a lubricating assembly according to claim 6, characterized in that: The locating sleeve assembly further comprises a nut, the nut being arranged on the extension sleeve, the nut being in threaded connection with the rear end of the second threaded part, and the nut being in abutment with the front end cover.

8. The fixed-shaft stepper motor with a lubricating assembly according to claim 7, characterized in that: One end of the spline shaft close to the screw rod is provided with an anti-extrusion part, the maximum radial dimension of the anti-extrusion part being greater than the maximum radial dimension of the rest of the spline shaft.

9. The fixed-shaft stepper motor with lubricating assembly according to any one of claims 1-4, characterized in that: One end of the half-ring extruding piece away from the front end cover is provided with an anti-extrusion ring.

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