CN216794778U

CN216794778U - Motor capable of reducing displacement of rotor shaft

Info

Publication number: CN216794778U
Application number: CN202122821960.2U
Authority: CN
Inventors: 黄文彬; 吴钰铤; 张长华
Original assignee: Ningbo Yat Electrical Appliance Co ltd
Current assignee: Ningbo Yat Electrical Appliance Co ltd
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2022-06-21
Anticipated expiration: 2031-11-17

Abstract

The utility model discloses a motor capable of reducing displacement of a rotor shaft, which comprises the rotor shaft, an output shaft and a casing, wherein the front end of the rotor shaft is rotatably connected to the front part of the casing through a first bearing, one end of the output shaft extends into the casing and is connected with the rotor shaft, a driving tooth is arranged on the rotor shaft in front of the first bearing, a gear ring is arranged at one end of the output shaft extending into the casing, the driving tooth is in meshing transmission with the gear ring, the output shaft at the front part of the gear ring is rotatably connected to the casing through a third bearing, and the output shaft at the rear part of the gear ring is rotatably connected to the casing through a fourth bearing. The utility model can reduce the transmission of knocking acting force to the rotor shaft when assembling the output shaft, effectively reduce the deviation of the rotor shaft relative to the casing and avoid influencing the concentricity of the rotor shaft.

Description

Motor capable of reducing displacement of rotor shaft

Technical Field

The utility model belongs to the field of motor equipment, and particularly relates to a motor capable of reducing displacement of a rotor shaft.

Background

The motor is an electromagnetic device for realizing electric energy conversion or transmission according to an electromagnetic induction law, the motor mainly has the function of generating driving torque and can be used as a power source of various machines, when the motor is used as the power source, the motor drives an output shaft to rotate through a rotor shaft, and the output shaft drives a load to rotate through a transmission part such as a coupler or a gear. In the existing motor structure, an output shaft is generally connected with a rotor shaft through a flat key or a spline, when the output shaft is connected with or detached from a transmission part, the transmission part and the output shaft generally need to be sleeved in an interference fit manner, and an operator needs to strongly knock and strike the transmission part in the connection mode no matter in the installation or detachment, so that the transmission part is connected to or detached from the output shaft through large instantaneous acting force. Because the action of manual knocking and striking can not be accurately and completely carried out along the direction of the output shaft, the output shaft is caused to receive certain striking acting force along the axial direction and the radial direction, the striking acting force can be easily transmitted to the rotor shaft in a key connection mode by the rotor shaft and the output shaft, the rotor shaft can slightly shift relative to the shell along the radial direction after a long time, the concentricity of the rotor shaft and the stator is influenced, and the condition that a rotor iron core and the stator are rubbed and collided in the working process of the motor can be seriously caused, so that the service life of the motor is influenced.

In addition, in order to ensure the insulativity, the conventional output shaft comprises two sections, one section is connected with the rotor shaft, the other section is used for being connected with the transmission part, and the two sections of output shafts are pressed and installed through the plastic sleeve pipe, so that the insulation is realized through the non-conductive plastic sleeve pipe. However, the rigidity of the plastic sleeve is lower than that of the output shaft which is generally made of metal, so that the plastic sleeve is easy to deform during knocking and striking, and the two sections of output shafts are not coaxial, so that the transmission efficiency is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a motor capable of reducing the displacement of a rotor shaft, and the motor can effectively solve the problem that the service life of the motor is influenced because the output shaft and the rotor shaft are slightly displaced relative to a shell when an output shaft and a transmission part of the motor are disassembled and assembled in the prior art.

In order to solve the technical problems, the utility model adopts the following technical scheme: the utility model provides a motor that reducible rotor shaft shifted, includes rotor shaft, output shaft and casing, the front end of rotor shaft rotates the front portion of connecting at the casing through first bearing, output shaft one end stretches into the casing and is connected with the rotor shaft, the last drive tooth of having seted up of rotor shaft in first bearing the place ahead, the one end that the output shaft stretches into the casing is equipped with the ring gear, drive tooth and ring gear meshing transmission, the anterior output shaft of ring gear passes through the third bearing and rotates the connection on the casing, and the output shaft at ring gear rear portion passes through the fourth bearing and rotates the connection on the casing.

Preferably, the end part of one end of the output shaft extending into the casing is provided with a limiting section, the limiting section is provided with a fifth bearing, and a fifth mounting hole for mounting the fifth bearing is formed in the casing. Through set up spacing section at the output shaft rear end to be equipped with the fifth bearing in spacing section, can further improve the stability of output shaft, further prevent to hit the effort and transmit to the rotor shaft.

Preferably, the diameter of the limiting section is smaller than that of the output shaft. Therefore, the occupied space of the limiting section in the vertical direction can be reduced, and the overall design size of the motor is reduced.

Preferably, a first mounting hole for mounting the first bearing is formed in the machine shell, and the first mounting hole is located right above the fifth mounting hole. Therefore, the machine shell part below the first mounting hole can be used as the machine shell part above the fifth mounting hole, both sides of the machine shell of the part are subjected to acting force, the machine shell is prevented from deforming, and the service life of the machine shell is prolonged.

Preferably, the outer ring of the fifth bearing is in interference fit with the fifth mounting hole, and the inner ring of the fifth bearing is in interference fit with the output shaft. Therefore, the output shaft can drive the inner ring to rotate relative to the outer ring and the shell.

Preferably, the fifth bearing is a needle bearing.

Preferably, the casing is provided with a through hole used for being assembled with the output shaft, the through hole is communicated with the third mounting hole, the inner wall of the through hole is provided with an annular groove, and a retainer ring used for limiting the third bearing along the axial direction is arranged in the annular groove. The retaining ring plays a limiting role in the outer ring of the third bearing and prevents the third bearing from being separated from the mounting hole.

Preferably, the gear ring is a helical gear ring. The overlap ratio of the helical teeth meshing is larger, and the meshing performance is better.

Preferably, the motor further comprises a rotor core, the rotor core is fixedly connected with the rotor shaft, and the rotor core is provided with a paint dipping insulating layer through paint dipping. The insulating property between the rotor shaft and the rotor core can be ensured by arranging the paint dipping insulating layer, so that the connection between the rotor shaft and the output shaft is insulating and non-conductive, a plastic sleeve on the output shaft can be omitted, the whole output shaft structure can be used, the integral rigidity of the output shaft is ensured, and the radial bending and the influence on the concentricity of the output shaft are avoided.

Preferably, the paint-dipping insulating layer is also coated with insulating powder to form a powder-coated insulating layer. Through the cooperation of package powder insulating layer and dip coating insulating layer, further promote insulating effect, promote the security performance.

Compared with the prior art, the utility model has the following beneficial effects:

1. the connecting structure of the output shaft and the rotor shaft in the existing structure is changed into gear transmission connection, so that the output shaft and the rotor shaft are positioned on different axes, further the knocking acting force is difficult to be transmitted to the rotor shaft along the axial direction, further the rotor shaft can be ensured not to slightly shift relative to the casing along the axial direction, and the service life of the motor is prolonged;

2. through set up third bearing and fourth bearing on the output shaft of ring gear front and back both sides respectively, through two point location, guarantee the radial stability of output shaft, when the output shaft received the effort of strikeing, the butt between accessible third bearing and the casing, the butt between fourth bearing and the casing undertakes most of effort of strikeing, can effectively reduce this effort and transmit to the rotor shaft, and then reduce the rotor shaft and take place slight aversion along radially.

Drawings

Fig. 1 is a cross-sectional view of a motor capable of reducing displacement of a rotor shaft according to a first embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an output shaft according to a first embodiment;

FIG. 3 is a cross-sectional view of a motor with less rotor shaft displacement according to a second embodiment of the present invention

Fig. 4 is a schematic structural diagram of an output shaft in the second embodiment.

Wherein: 1. the motor comprises a rotor shaft, 10 driving teeth, 11 first bearings, 12 second bearings, 2 output shafts, 20 gear rings, 21 third bearings, 22 fourth bearings, 23 limiting sections, 24 fifth bearings, 3 a machine shell, 4 retaining rings, 5 rotor cores and 6 stators.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected or detachably connected or integrated; may be mechanically coupled, may be electrically coupled or may be in communication with each other; may be directly connected or indirectly connected through an intermediate, unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The first embodiment is as follows: as shown in fig. 1 and fig. 2, the motor capable of reducing displacement of the rotor shaft provided in this embodiment includes a rotor shaft 1, a rotor core 5, a stator 6, an output shaft 2 and a casing 3, wherein the stator 6 is fixedly assembled with respect to the casing 3, and the rotor core 5 is in key connection or interference fit with the rotor shaft 1, so that the rotor shaft 1 rotates to drive the rotor core 5 to rotate with respect to the stator 6, in order to ensure that the rotor shaft 1 has good concentricity with respect to the stator 6, a first mounting hole and a second mounting hole are respectively formed at the front end and the rear end of the casing 3, a first bearing 11 is fixedly disposed at the front end of the rotor shaft 1, a second bearing 12 is fixedly disposed at the rear end of the rotor shaft 1, the first bearing 11 is mounted in the first mounting hole, and the second bearing 12 is mounted in the second mounting hole. In this embodiment, the driving teeth 10 have been seted up on the rotor shaft 1 in front of the first bearing 11, 2 one end of the output shaft stretches into the casing 3, the one end that the output shaft 2 stretches into the casing 3 is equipped with the ring gear 20, the driving teeth 10 meshes the transmission with the ring gear 20, the anterior output shaft 2 of ring gear 20 rotates through the third bearing 21 and connects on the casing 3, the output shaft 2 at the rear of ring gear 20 rotates through the fourth bearing 22 and connects on the casing 3, concretely, also set up the bearing mounting hole on the casing 3 correspondingly, that is, the third mounting hole, the fourth mounting hole, the third bearing 21 is installed in the third bearing 21 is downthehole, the fourth bearing 22 is installed in the fourth bearing 22 is downthehole, the ring gear 20 in this embodiment chooses the skewed tooth ring gear for use, the coincidence degree of skewed tooth meshing is bigger, the meshing performance is better. The motor provided by the embodiment changes a connecting structure of the output shaft and the rotor shaft in the existing structure into gear transmission connection, so that the output shaft 2 and the rotor shaft 1 are positioned on different axes, and further, the knocking acting force is difficult to be transmitted to the rotor shaft 1 along the axial direction, further, the rotor shaft 1 can be ensured not to slightly shift relative to the shell 3 along the axial direction, and the service life of the motor is prolonged; meanwhile, the third bearing 21 and the fourth bearing 22 are respectively arranged on the output shaft 2 on the front side and the rear side of the gear ring 20, the stability of the output shaft 2 in the radial direction is ensured through two-point positioning, when the output shaft 2 is subjected to knocking acting force, most of the knocking acting force can be born through the butting between the third bearing 21 and the machine shell 3 and the butting between the fourth bearing 22 and the machine shell 3, the acting force can be effectively reduced and transmitted to the rotor shaft 1, and further, the slight displacement of the rotor shaft 1 in the radial direction is reduced.

Still be equipped with the through-hole that is used for with output shaft 2 assembly on casing 3, through-hole and third mounting hole intercommunication are equipped with the annular groove on the through-hole inner wall, are equipped with in the annular groove to be used for along the axial to the spacing retaining ring 4 of third bearing 21, and retaining ring 4 plays limiting displacement to the outer lane of third bearing 21, prevents that third bearing 21 from deviating from in the mounting hole.

For avoiding the plastic casing among the prior art to cause the influence to the concentricity of output shaft 2 itself, get rid of the plastic casing in this embodiment, guarantee the insulating properties of motor through other modes, it is concrete, this motor still includes rotor core 5 in this embodiment, rotor core 5 and 1 fixed connection of rotor shaft, rotor core 5 is equipped with the dip coating insulating layer through the dip coating. The insulativity between the rotor shaft 1 and the rotor core 5 can be ensured by arranging the paint dipping insulating layer, so that the connection between the rotor shaft 1 and the output shaft 2 is insulating and non-conductive, a plastic sleeve on the output shaft 2 can be omitted, the whole output shaft 2 structure can be used, the integral rigidity of the output shaft 2 is ensured, and the radial bending and the influence on the concentricity of the output shaft 2 are avoided. Furthermore, insulating powder is sprayed outside the paint dipping insulating layer to form a powder coating insulating layer. Through the cooperation of the powder coating insulating layer and the paint dipping insulating layer, the insulating effect is further improved, and the safety performance is improved.

Example two: as shown in fig. 3 and 4, the present embodiment also provides a motor capable of reducing the displacement of the rotor shaft, and the present embodiment is different from the first embodiment in that a limiting section 23 is further disposed at an end portion of the output shaft 2, which extends into the casing 3, specifically, the limiting section 23 is integrally formed with the output shaft 2, a fifth bearing 24 is disposed on the limiting section 23, and a fifth mounting hole for mounting the fifth bearing 24 is disposed in the casing 3. Through set up spacing section 23 at output shaft 2 rear end to be equipped with fifth bearing 24 on spacing section 23, can further improve output shaft 2's stability, when output shaft 2 received the effort of strikeing, can further prevent that the effort from transmitting to rotor shaft 1, avoid rotor shaft 1 to take place slight aversion along radially.

The fifth bearing 24 is a needle bearing, and during assembly, an inner ring of the needle bearing is connected with a corresponding shaft in an interference fit manner, and then an outer ring of the needle bearing is mounted in an interference fit manner with an inner wall of a corresponding mounting hole, so that the corresponding rotor shaft 1 or the output shaft 2 can drive the inner ring of the needle bearing to rotate relative to the outer ring, and the outer ring and the mounting hole are relatively fixed. In order to prolong the service life of the casing and reduce the extrusion on the wall of the mounting hole, the fifth bearing 24 is arranged under the first bearing 11 in the embodiment, i.e. the casing below the first mounting hole is also used as the casing on the upper part of the fifth mounting hole, so that the directions of the forces applied to the upper and lower parts of the casing are opposite and on the same straight line, thereby avoiding the formation of shearing force, effectively preventing the extrusion and shearing on the casing and prolonging the service life of the casing.

In addition, the diameter of the limiting section 23 is set to be smaller than that of the output shaft 2 in the embodiment, so that the occupied space of the limiting section 23 in the vertical direction can be reduced, the design size of the fifth mounting hole for mounting the fifth bearing 24 is reduced, and the design of the size of the motor shell can be facilitated.

The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.

Claims

1. The utility model provides a motor of reducible rotor shaft aversion, includes rotor shaft (1), output shaft (2) and casing (3), the front end of rotor shaft (1) rotates through first bearing (11) and connects in the front portion of casing (3), output shaft (2) one end stretches into casing (3) and is connected with rotor shaft (1), its characterized in that: drive tooth (10) have been seted up on rotor shaft (1) in first bearing (11) the place ahead, the one end that output shaft (2) stretched into casing (3) is equipped with ring gear (20), drive tooth (10) and ring gear (20) meshing transmission, rotate through third bearing (21) and connect on casing (3) output shaft (2) of ring gear (20) front portion, and output shaft (2) at ring gear (20) rear portion rotate through fourth bearing (22) and connect on casing (3).

2. A motor for reducing rotor shaft displacement as defined in claim 1, wherein: the output shaft (2) stretches into one end tip of casing (3) and is equipped with spacing section (23), be equipped with fifth bearing (24) on spacing section (23), be equipped with the fifth mounting hole that is used for installing fifth bearing (24) in casing (3).

3. A motor for reducing rotor shaft displacement as defined in claim 2, wherein: the diameter of the limiting section (23) is smaller than that of the output shaft (2).

4. A motor for reducing rotor shaft displacement as defined in claim 2, wherein: and a first mounting hole for mounting the first bearing (11) is formed in the machine shell (3), and the first mounting hole is positioned right above the fifth mounting hole.

5. A motor for reducing rotor shaft displacement as defined in claim 2, wherein: the outer ring of the fifth bearing (24) is in interference fit with the fifth mounting hole, and the inner ring of the fifth bearing (24) is in interference fit with the output shaft (2).

6. A motor for reducing rotor shaft displacement as recited in claim 5, wherein: the fifth bearing (24) is a needle bearing.

7. A motor for reducing rotor shaft displacement as defined in claim 1, wherein: the motor is characterized in that a through hole used for being assembled with the output shaft (2) is formed in the shell (3), the through hole is communicated with the third mounting hole, an annular groove is formed in the inner wall of the through hole, and a retainer ring (4) used for limiting the third bearing (21) along the axial direction is arranged in the annular groove.

8. A motor for reducing rotor shaft displacement as defined in claim 1, wherein: the gear ring (20) is a helical gear ring.

9. An electric machine with reduced rotor shaft displacement as claimed in any one of claims 1 to 8, characterised in that: the motor further comprises a rotor core, the rotor core is fixedly connected with the rotor shaft (1), and the rotor core is provided with a paint dipping insulating layer through paint dipping.

10. A motor for reducing rotor shaft displacement as recited in claim 9, wherein: and insulating powder is further sprayed outside the dip coating insulating layer to form a powder coating insulating layer.