CN214756024U

CN214756024U - Rear fixed shaft type linear stepping motor

Info

Publication number: CN214756024U
Application number: CN202120827186.3U
Authority: CN
Inventors: 马海峰
Original assignee: Changzhou Wheeler Motor Co ltd
Current assignee: Changzhou Wheeler Motor Co ltd
Priority date: 2021-04-22
Filing date: 2021-04-22
Publication date: 2021-11-16
Anticipated expiration: 2031-04-22

Abstract

The utility model discloses a rear fixed shaft type linear stepping motor, which comprises a motor shell, a stator component, a rotor component and a rear fixing device, wherein the rotor component comprises a screw, a nut and a rotor; the output end of the screw is connected with equipment, the rear fixing device comprises a fixing piece fixedly connected with the motor shell and a moving piece connected with the input end of the screw, and the inner surface of the fixing piece is provided with a tooth-shaped track; the circumferential outer surface of the movable piece is provided with an outer tooth structure meshed with the tooth-shaped rail. The utility model discloses well back fixing device connects the one end of keeping away from equipment on the screw rod to increased the installation space of equipment, it is more convenient to install, secondly, the circumference that back fixing device realized the screw rod through the cooperation of profile of tooth track and external tooth structure is spacing, has effectively guaranteed the concentricity of screw rod.

Description

Rear fixed shaft type linear stepping motor

Technical Field

The utility model relates to a linear electric motor designs technical field, especially relates to a back fixed axle formula linear stepping motor.

Background

To the linear stepping motor of screw rod nut cooperation form, it is spacing to carry out circumference to the screw rod, make the screw rod can make linear motion, current linear stepping motor generally need add circumference stop device in the motor outside and guarantee the steady operation of screw rod, all set up bearing structure (for the support drum in CN201922036773.6 like the patent) at the screw rod tip that is close to the customer end (the utility model discloses in, all at present, at first because this bearing structure sets up the position that is close to the customer end, consequently lead to the customer end installation space not enough easily, secondly, this bearing structure is far away with the distance of motor casing, often needs independent setting, can lead to the screw rod concentricity to reduce like this, influences the rotation of screw rod.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem that the linear stepping motor among the prior art occupies the space of customer installation face and leads to the concentricity of screw rod to reduce easily, the utility model provides a back fixed axle formula linear stepping motor solves above-mentioned problem.

The utility model provides a technical scheme that its technical problem adopted is: a rear fixed shaft type linear stepping motor comprises a motor shell, a stator component, a rotor component and a rear fixing device, wherein the rotor component comprises a screw, a nut and a rotor; the screw rod axially penetrates through the motor shell, the nut is in threaded connection with the periphery of the screw rod and is axially fixed, the rotor is positioned on the periphery of the nut and drives the nut to rotate, and the stator assembly is positioned on the periphery of the rotor; the output end of the screw is connected with equipment, the rear fixing device comprises a fixing piece fixedly connected with the motor shell and a moving piece connected with the input end of the screw, and the inner surface of the fixing piece is provided with a tooth-shaped track; the circumferential outer surface of the movable piece is provided with an outer tooth structure meshed with the tooth-shaped rail.

Furthermore, the fixing part is a barrel-shaped structure with an opening at one end, the opening end of the fixing part faces the screw rod, and the extending direction of the tooth-shaped track is perpendicular to the opening end of the fixing part.

Further, the screw rod includes equipment linkage segment, screw thread section and grafting section that the axial connects gradually, the periphery of screw thread section have with nut screw-thread fit's external screw thread, the center of moving part has the perforating hole, the grafting section with perforating hole interference fit.

Furthermore, a pin hole is formed in the equipment connecting section.

Furthermore, the threaded section radially protrudes out of the inserting section, and the movable piece is connected with the end face of the threaded section.

Further, the mounting include with the fixed part that the motor casing is connected and with the intermediate junction portion that the inner periphery of fixed part is connected, the fixed part with circumference limit structure that has the cooperation each other between the intermediate junction portion, the profile of tooth track is located the inner periphery of intermediate junction portion.

Furthermore, the circumferential limiting structures are grooves and lugs which are respectively positioned on the fixing part and the middle connecting part and are matched in a one-to-one correspondence mode.

Further, the circumferential inner side of the fixing part is provided with a concave-convex structure in frictional contact with the intermediate connecting part.

Furthermore, the two ends of the motor shell are rotatably connected with the rotor assembly through bearings.

Furthermore, a shaft sleeve is arranged between the nut and the rotor, supporting sections for supporting the bearing are arranged at two axial ends of the shaft sleeve, and a shaft shoulder capable of abutting against the end faces of the nut and the bearing is arranged on the shaft sleeve.

The utility model has the advantages that:

(1) rear fixed axle formula linear step motor, the one end of keeping away from equipment on the screw rod is connected to rear fixing device to increased the installation space of equipment, it is more convenient to install, secondly, rear fixing device realizes through the cooperation of profile of tooth track and external tooth structure that the circumference of screw rod is spacing, has effectively guaranteed the concentricity of screw rod.

(2) Rear fixed axle formula linear stepping motor, fixed part and intermediate junction pass through spacing realization fixed connection between them of circumference limit structure and axle head, thereby make the arbitrary dismouting of mounting can change the intermediate junction portion of easy wearing and tearing, improves the life of mounting.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a front view of an embodiment of a rear fixed shaft type linear stepping motor according to the present invention;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

FIG. 3 is an enlarged view of FIG. 2 at a;

FIG. 4 is an enlarged view of FIG. 2 at b;

FIG. 5 is a sectional view taken along line B-B of FIG. 1;

fig. 6 is a perspective view of the movable member of the present invention;

FIG. 7 is a front view of the screw of the present invention;

FIG. 8 is a perspective view of the intermediate connection portion of the present invention;

fig. 9 is a perspective view of the fixing portion of the present invention.

In the figure, 1, a motor shell, 2, a stator assembly, 3, a rear fixing device, 301, a fixing piece, 3011, a fixing part, 30111, a groove, 3012, an intermediate connecting part, 30121, a toothed rail, 30122, a lug, 302, a movable piece, 3021, an external tooth structure, 3022, a through hole, 4, a screw, 401, an equipment connecting section, 402, a threaded section, 403, an insertion section, 5, a nut, 6, a rotor, 7, a sawtooth, 8, a bearing, 9, a shaft sleeve, 901, a supporting section, 902, a shaft shoulder, 10 and a stop block.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

As shown in fig. 1-5, a rear fixed shaft linear stepping motor comprises a motor housing 1, a stator assembly 2, a rotor assembly and a rear fixing device 3, wherein the rotor assembly comprises a screw 4, a nut 5 and a rotor 6; the screw 4 axially penetrates through the motor casing 1, the nut 5 is in threaded connection with the periphery of the screw 4, the nut 5 is axially fixed, the rotor 6 is positioned on the periphery of the nut 5 and drives the nut 5 to rotate, and the stator assembly 2 is positioned on the periphery of the rotor 6; the output end of the screw rod 4 is connected with the equipment, the rear fixing device 3 comprises a fixing piece 301 fixedly connected with the motor shell 1 and a movable piece 302 connected with the input end of the screw rod 4, and the inner surface of the fixing piece 301 is provided with a tooth-shaped track 30121; the circumferential outer surface of the movable piece 302 has an external tooth structure 3021 that meshes with the toothed track 30121.

Motor casing 1 is used for supporting and keeping apart rotor subassembly and stator module 2, and the rotor subassembly is located stator module 2's internal week, and stator module 2 is used for being connected with external circuit, produces the transform magnetic field after stator module 2 lets in exciting current to drive rotor 6 rotation and nut 5, screw rod 4 is spacing by 3 circumference of back fixing device, when nut 5 is rotatory, screw rod 4 is along axial displacement, thereby drives the equipment removal. The movable piece 302 and the fixed piece 301 are circumferentially limited through meshed gears, meanwhile, the toothed rail 30121 axially extends along the screw 4, when the screw 4 moves, the movable piece 302 can slide along the toothed rail 30121, and the requirement of the gear meshing structure on the concentricity of the structure is high, so that the concentricity of the screw 4 can be effectively guaranteed through the matching design of the toothed rail 30121 and the external tooth structure 3021.

In one embodiment of the present invention, the fixing member 301 is a barrel structure with an open end, the open end of the fixing member 301 faces the screw rod 4, and the extension direction of the tooth-shaped track 30121 is perpendicular to the open end of the fixing member 301. That is, the extending direction of the toothed track 30121 is parallel to the axial direction of the screw rod 4, and one end of the fixing member 301 is closed, so as to form an end face closed structure with the motor casing 1, so that the input end of the screw rod 4 is sealed in the fixing member 301.

The screw 4 adopts, but is not limited to, the following structure: as shown in fig. 7, the screw rod 4 includes an apparatus connection section 401, a screw thread section 402 and an insertion section 403 which are sequentially connected in an axial direction, an external thread which is in thread fit with the nut 5 is arranged on the periphery of the screw thread section 402, a through hole 3022 is arranged in the center of the movable member 302, the insertion section 403 is in interference fit with the through hole 3022, the apparatus connection section 401 is used for being connected with an apparatus, the apparatus is driven to move, the screw thread section 402 is used for being in thread fit with the nut 5, the insertion section 403 is used for being fixedly connected with the movable member 302, the arrangement of the insertion section 403 can increase the contact area between the screw rod 4 and the movable member 302, the coaxiality of the screw rod 4 and the movable member 302 is ensured, the insertion section 403 and the movable member 302 can be fixed in interference fit, and the contact surfaces of the two can also be fixed by coating glue. Preferably, the device connecting section 401 is provided with a pin hole, and the device and the screw rod 4 can rotate relatively.

In a further embodiment, a threaded section 402 projects radially beyond the plug section 403, and the movable element 302 is connected to an end face of the threaded section 402. When the screw rod 4 moves towards the input end, the screw rod 4 can abut against the end surface of the movable element 302 so as to drive the movable element 302 to move.

Because the tooth-shaped track 30121 on the inner periphery of the fixing member 301 is frequently rubbed, and the tooth-shaped track 30121 is easily worn, the fixing member 301 preferably has a split structure, and specifically includes a fixing portion 3011 connected to the motor casing 1 and an intermediate connecting portion 3012 connected to the inner periphery of the fixing portion 3011, the fixing portion 3011 and the intermediate connecting portion 3012 have a circumferential limit structure therebetween, the tooth-shaped track 30121 is located on the inner periphery of the intermediate connecting portion 3012, the fixing portion 3011 and the intermediate connecting portion 3012 are circumferentially fixed by the circumferential limit structure, the intermediate connecting portion 3012 is axially fixed by the stopper 10 located at one end of the intermediate connecting portion 3012 and the fixing portion 3011 located at the other end of the intermediate connecting portion 3012 (as shown in fig. 2, the stopper 10 is located at the left end of the intermediate connecting portion 3012, and the fixing portion 3011 is fixed on the motor casing 1), no other parts are needed for fixing, when the intermediate connecting portion 3012 is worn, only the intermediate connecting portion 3012 needs to be replaced, the fixing member 301 does not need to be replaced integrally, and the utilization rate of materials is improved.

The circumferential limiting structure may be, but is not limited to, grooves 30111 and lugs 30122 respectively located on the fixing portion 3011 and the intermediate connecting portion 3012 and matched in a one-to-one correspondence manner, as shown in fig. 8 and 9, the grooves 30111 are approximately semicircular grooves, six grooves 30111 are arranged on the inner periphery of the fixing portion 3011 in a circumferential array, the lugs 30122 radially protrude from the outer periphery of the intermediate connecting portion 3012, and each of the grooves 30111 and the lugs 30122 extends in the axial direction of the fixing portion 3011 and the intermediate connecting portion 3012 and only serves to limit the rotation movement of the fixing portion 3011 and the intermediate connecting portion 3012.

The fixing portion 3011 is also provided, on the circumferential inner side, with a concave-convex structure 7 which is in frictional contact with the intermediate connecting portion 3012. The concavo-convex structure 7 is a screw thread as shown in fig. 9 as long as it is used to increase the frictional force between the fixing portion 3011 and the intermediate connecting portion 3012 to avoid axial play.

Motor casing 1 is fixed part 3011 spare, and the rotor subassembly is rotating member, because rotor 6 in the rotor subassembly need pass motor casing 1, consequently motor casing 1's both ends pass through bearing 8 with the rotor subassembly rotates to be connected the utility model discloses an among the embodiment, still be provided with axle sleeve 9 between nut 5 and the rotor 6, axle sleeve 9's axial both ends have support bearing 8's support section 901, have on the axle sleeve 9 can support the shoulder 902 at nut 5 and bearing 8 terminal surface, as shown in the figure, have four shoulders 902 on the axle sleeve 9, wherein two shoulders 902 support the axial both ends at nut 5, two other shoulders 902 support the interior terminal surface at two bearings 8 respectively, two bearings 8 can be spacing with axle sleeve 9 axial, and axle sleeve 9 is spacing with nut 5 axial through the butt with nut 5 again.

In the description of the present invention, it should be understood that the terms "center", "inner", "outer", "axial", "circumferential", and the like refer to the orientation or positional relationship shown in the drawings, which are only for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In this specification, the schematic representations of the terms are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides a back fixed axle formula straight line step motor which characterized in that: the motor comprises a motor shell (1), a stator component (2), a rotor component and a rear fixing device (3), wherein the rotor component comprises a screw (4), a nut (5) and a rotor (6); the screw rod (4) axially penetrates through the motor shell (1), the nut (5) is in threaded connection with the periphery of the screw rod (4) and is axially fixed, the rotor (6) is located on the periphery of the nut (5) and drives the nut (5) to rotate, and the stator assembly (2) is located on the periphery of the rotor (6);

the output end of the screw rod (4) is connected with equipment, the rear fixing device (3) comprises a fixing piece (301) fixedly connected with the motor shell (1) and a movable piece (302) connected with the input end of the screw rod (4), and the inner surface of the fixing piece (301) is provided with a toothed track (30121); the circumferential outer surface of the movable piece (302) is provided with an external tooth structure (3021) meshed with the toothed track (30121).

2. The rear fixed shaft type linear stepping motor according to claim 1, characterized in that: the fixing piece (301) is of a barrel-shaped structure with one open end, the open end of the fixing piece (301) faces the screw rod (4), and the extending direction of the tooth-shaped track (30121) is perpendicular to the open end of the fixing piece (301).

3. The rear fixed shaft type linear stepping motor according to claim 1, characterized in that: screw rod (4) include equipment linkage segment (401), screw thread section (402) and grafting section (403) that the axial connects gradually, the periphery of screw thread section (402) have with nut (5) screw thread fit's external screw thread, the center of moving part (302) has through-hole (3022), grafting section (403) with through-hole (3022) interference fit.

4. The rear fixed shaft type linear stepping motor according to claim 3, wherein: and a pin hole is formed in the equipment connecting section (401).

5. The rear fixed shaft type linear stepping motor according to claim 3, wherein: the threaded section (402) radially protrudes out of the insertion section (403), and the movable piece (302) is connected with the end face of the threaded section (402).

6. The rear fixed shaft type linear stepping motor according to claim 1, characterized in that: the fixing piece (301) comprises a fixing portion (3011) connected with the motor shell (1) and an intermediate connecting portion (3012) connected with the inner periphery of the fixing portion (3011), a circumferential limiting structure matched with each other is arranged between the fixing portion (3011) and the intermediate connecting portion (3012), and the tooth-shaped track (30121) is located on the inner periphery of the intermediate connecting portion (3012).

7. The rear fixed shaft type linear stepping motor according to claim 6, wherein: the circumferential limiting structures are grooves (30111) and lugs (30122) which are respectively located on the fixing portion (3011) and the middle connecting portion (3012) and are matched with each other in a one-to-one correspondence mode.

8. The rear fixed shaft type linear stepping motor according to claim 7, wherein: the circumferential inner side of the fixing part (3011) is provided with a concave-convex structure (7) in frictional contact with the intermediate connecting part (3012).

9. The rear fixed shaft type linear stepping motor according to claim 1, characterized in that: the two ends of the motor shell (1) are rotatably connected with the rotor component through bearings (8).

10. The rear fixed shaft type linear stepping motor according to claim 9, wherein: a shaft sleeve (9) is further arranged between the nut (5) and the rotor (6), supporting sections (901) for supporting the bearing (8) are arranged at two axial ends of the shaft sleeve (9), and a shaft shoulder (902) capable of abutting against the end faces of the nut (5) and the bearing (8) is arranged on the shaft sleeve (9).