CN213213257U

CN213213257U - Linear motor

Info

Publication number: CN213213257U
Application number: CN202021535505.5U
Authority: CN
Inventors: 张栋; 曾凯; 吴志敢
Original assignee: Shanghai Mingzhi Paibosi Automation Technology Co ltd
Current assignee: Shanghai Mingzhi Paibosi Automation Technology Co ltd
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2021-05-14
Anticipated expiration: 2030-07-29

Abstract

The utility model relates to a linear motor, including motor body (1), shell (2), even axle mechanism (3), bearing (4) and lead screw (5), even axle mechanism (3) establish in shell (2), its one end is connected with lead screw (5), the output shaft of the other end and motor body (1), bearing (4) set up in lead screw (5) and even axle mechanism (3) junction. Compared with the prior art, the utility model has the advantages of can eliminate the axial float, ensure the concentricity simultaneously, multiplicable product load capacity again.

Description

Linear motor

Technical Field

The utility model relates to a motor especially relates to a linear electric motor.

Background

A high-speed slender miniature motor is used as a high-performance motor product. Because of the outstanding characteristics of high power density, compact volume and the like and excellent performance, the composite material has irreplaceable positions in the applications of handheld instruments, medical instruments and the like with strict requirements on the diameter of a machine body, and is used in more and more fields.

However, the motor has a certain axial play, and is often used in combination with a reduction gearbox due to the high-speed characteristic, and the gear in the reduction gearbox is also axially gapped when being matched. These gaps cannot be eliminated if a coupling is used for direct connection. The existence of the axial movement has no great influence on the rotary motion of using a belt wheel, but for the linear motion of matching a lead screw nut, the final positioning precision of a product is directly influenced by the size of the axial movement, and the performance of the product is directly determined.

Meanwhile, for the linear motion scheme of the motor, few existing mechanisms can be realized. The prior art can use external shaft coupling usually, links to each other lead screw and output shaft, changes rotary motion into rectilinear motion. However, the volume of the coupler is often larger, and the advantage of small volume of the miniature motor cannot be fully embodied by matching.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a linear electric motor in order to overcome the defect that above-mentioned prior art exists, this motor can eliminate the axial float, ensures the concentricity simultaneously, multiplicable product load capacity again.

The purpose of the utility model can be realized through the following technical scheme:

the utility model provides a linear motor, includes motor body, shell, even axle mechanism, bearing and lead screw, even axle mechanism establish in the shell, its one end is connected with the lead screw, the other end and motor body's output shaft, the bearing setting in lead screw and even axle mechanism junction.

Preferably, the housing is provided with a bearing chamber for placing the bearing and an internal thread connected with the motor body.

Preferably, the front end and the rear end of the connecting shaft mechanism are provided with two concentric inner holes, and the screw rod is provided with an adaptive section matched with the connecting shaft mechanism.

Preferably, the coupling mechanism is provided with a threaded hole for mounting a set screw in the circumferential direction.

Preferably, the connecting shaft mechanism is connected with the screw rod through fine threads.

Preferably, the output shaft of the motor body is of a flat structure, and further is of a vertical double-flat structure.

Preferably, the connecting shaft mechanism is connected with the output shaft of the motor body through a pin.

Preferably, the outer diameter of the circumference of the contact surface of the connecting shaft mechanism and the bearing is smaller than the outer diameter of the bearing inner ring.

Preferably, the front end of the bearing chamber of the housing is provided with a locking block for adjusting the pretightening force of the bearing according to different bearing types.

Preferably, the inner diameter of the locking block is smaller than the outer diameter of the bearing.

Compared with the prior art, the utility model has the advantages of it is following:

1) axial play is reduced;

2) the load bearing capacity is improved;

3) the structure is compact;

4) high stability.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic diagram of the explosion structure of the present invention;

FIG. 3 is a schematic view of the connection between the set screw and the coupling mechanism of the present invention;

FIG. 4 is a schematic view of the pin connection of the present invention;

FIG. 5 is a schematic view of the assembly of the present invention;

FIG. 6 is a schematic structural view of the locking block of the present invention;

fig. 7 is a schematic diagram comparing the present invention with the conventional scheme.

The motor comprises a motor body 1, a shell 2, a connecting shaft mechanism 3, a bearing 4, a screw rod 5, a nut 6, a set screw 7, a pin 8 and a locking block 9.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1-2, a linear motor includes a motor body 1, a housing 2, a coupling mechanism 3, a bearing 4 and a lead screw 5, wherein the coupling mechanism 3 is disposed in the housing 2, one end of the coupling mechanism is connected to the lead screw 5, the other end of the coupling mechanism is connected to an output shaft of the motor body 1, and the bearing 4 is disposed at a connection position of the lead screw 5 and the coupling mechanism 3. The shell 2 is provided with a bearing chamber for placing the bearing 4 and is also provided with an internal thread connected with the motor body 1. Two concentric inner holes are formed in the front end and the rear end of the connecting shaft mechanism 3, and the screw rod 5 is provided with an adaptive section 8 matched with the connecting shaft mechanism 3.

As shown in fig. 3, a screw hole for mounting the set screw 7 is provided in the circumferential direction of the coupling mechanism 3.

The connecting shaft mechanism 3 is connected with the screw rod 5 through fine threads. The output shaft of the motor body 1 is of a flat structure.

As shown in fig. 4, the coupling mechanism 3 is connected to the output shaft of the motor body 1 through a pin 8. The circumference external diameter of the contact surface of the connecting shaft mechanism 3 and the bearing 4 is smaller than the external diameter of the inner ring of the bearing 4.

Above structure, through the high concentricity of bearing room on the shell, guarantee that bearing and lead screw assembly have good concentricity after accomplishing. The connecting part of the screw rod and the connecting shaft mechanism is connected with the matching positioning part through threads, so that the screw rod has good concentricity relative to the shell. During assembly, the center of the motor can be automatically found only by rotating the lead screw, and finally the shell and the motor are connected through threads and screwed tightly. The difficulty of adjustment during assembly can be reduced, and slight decentration generated during part processing is compensated. Therefore, even if some deviation is generated during production and processing of parts, the deviation can be eliminated during assembly of the whole machine, and the whole machine still has good performance. This is a significant aid to both assembly and supply chain requirements.

Example 2

As shown in fig. 6, the front end of the bearing chamber of the housing 2 is provided with a locking block 9 for adjusting the pre-tightening force of the bearing according to different bearing types, and the inner diameter of the locking block 9 is smaller than the outer diameter of the bearing 4.

The structure introduces the locking block on the basis of the embodiment 1, the pretightening force of the bearing can be adjusted according to different bearing types, the performance of the bearing is optimized, and the axial float caused by the bearing clearance can be reduced, so that the axial float of the whole machine is further reduced. Meanwhile, the pin is added, so that the pretightening force brought by the locking block can be better borne compared with a set screw, and the structural stability of the whole machine is further improved.

Through the above two embodiments, as shown in fig. 7, the present invention has the following specific advantages:

1. reducing axial play.

The size of the axial clearance directly influences the positioning precision and the repeated positioning precision of the product. The mechanism can effectively reduce the axial clearance generated by the microminiature motor, the gear back clearance in the reduction gearbox and the bearing clearance through the combined use of the set screw, the pin or the locking block, and improves the important performance of the linear transmission product.

2. Improved load bearing capacity

The mechanism can share the pressure of a part of bearings in the motor and bearings of the reduction gearbox by introducing another bearing at the front end of the shell. The bearing at the front end of the housing may be chosen to be larger than the bearings in the motor and in the gearbox, which are subject to certain space constraints. And because the position is closer to the lead screw, when the lead screw bears radial force, the moment arm is relatively shorter, and the force borne by the bearing is smaller. This improves the load bearing capacity of the entire product.

3. The structure is compact.

The mechanism can highly integrate a lead screw providing linear transmission with a high-performance slender micro motor.

Compare traditional customer and build the mechanism by oneself, this design can reduce complete machine length, size and space demand by a wide margin. The diameter of the shell can be the same as that of the slender miniature motor body, and the length of the shell only needs about 15mm, so that the whole set of connecting shaft mechanism can be arranged in the shell. The micro motor is used for an application needing the micro motor and a use scene with large space limitation, and the micro motor is remarkably improved.

4. High stability.

Compared with a traditional self-built mechanism, a customer needs to adjust the concentricity of each component by self, the mechanism can effectively ensure the concentricity of the output screw rod and the slender micro motor through structural design, and jump is reduced, so that the output force reduction caused by the non-concentricity or the risk of blocking is reduced.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a linear motor, its characterized in that includes motor body (1), shell (2), links a mechanism (3), bearing (4) and lead screw (5), even mechanism (3) establish in shell (2), its one end is connected with lead screw (5), the output shaft of the other end and motor body (1), bearing (4) set up in lead screw (5) and link a mechanism (3) junction.

2. A linear motor according to claim 1, characterized in that the housing (2) is provided with a bearing chamber for the bearings (4) and with an internal thread for connection to the motor body (1).

3. A linear motor according to claim 1, wherein the front and rear ends of the coupling mechanism (3) are provided with two concentric inner bores, and the screw rod (5) is provided with an adapting section which is matched with the coupling mechanism (3).

4. A linear motor according to claim 1, characterized in that the coupling means (3) is provided with a threaded hole in the circumferential direction for receiving a set screw (7).

5. A linear motor according to claim 1, characterized in that the coupling means (3) is connected to the screw (5) by means of a fine thread.

6. A linear motor according to claim 1, characterized in that the output shaft of the motor body (1) is of a flat configuration, further of a vertical double flat configuration.

7. A linear motor according to claim 1, characterized in that the coupling means (3) is connected to the output shaft of the motor body (1) by means of a pin (8).

8. A linear motor according to claim 1, characterized in that the outer diameter of the circumference of the contact surface of the coupling mechanism (3) and the bearing (4) is smaller than the outer diameter of the inner ring of the bearing (4).

9. A linear motor according to claim 2, characterized in that the front end of the bearing chamber of the housing (2) is provided with a locking block (9) for adjusting the preload of the bearing according to different bearing types.

10. A linear motor according to claim 9, characterized in that the inner diameter of the locking piece (9) is smaller than the outer diameter of the bearing (4).