CN210380501U

CN210380501U - Motor transmission shaft and permanent magnet motor with same

Info

Publication number: CN210380501U
Application number: CN201921599411.1U
Authority: CN
Inventors: 礼宏伟; 礼泽升
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2020-04-21
Anticipated expiration: 2029-09-24

Abstract

The application discloses a motor drive shaft. The motor drive shaft includes: the inner gear ring is provided with inner teeth; one end of the central shaft is provided with external teeth matched with the internal teeth, and the other end of the central shaft is provided with a shaft sleeve; the part between the shaft sleeve and the external teeth is the body of the central shaft. The application also discloses a permanent magnet motor, permanent magnet motor contains above-mentioned motor drive shaft. The beneficial effect of this application lies in: the motor transmission shaft integrates the function of the coupler, the coupling is not needed for connecting the motor output shaft with the driven shaft, and the motor can be directly connected with the driven shaft. Additionally, the utility model discloses a motor drive shaft has ingenious utilized the inner space of motor, places the motor inside in this motor drive shaft most, and only axle sleeve part stretches out, has saved the installation space of equipment.

Description

Motor transmission shaft and permanent magnet motor with same

Technical Field

The application relates to the technical field of motors, in particular to a motor transmission shaft and a permanent magnet motor with the same.

Background

With the development of social economy, the industry puts higher and higher requirements on energy conservation and consumption reduction. The permanent magnet motor has excellent energy-saving and consumption-reducing effects, can realize direct drive with large torque, does not need a speed reducer, and saves the equipment installation space, so the permanent magnet motor is gradually and widely applied.

When the permanent magnet motor is used for low-speed direct driving in industry, a high-speed shaft coupler and a speed reducer are omitted, but when an output shaft of the permanent magnet motor is connected with a low-speed driven shaft, the output shaft of the permanent magnet motor needs to be connected with a coupler at present, one more part is added to the whole machine equipment, one more maintenance point is added, and the coupler belongs to a loss part. In addition, a transmission shaft (i.e., a motor rotor shaft) in the prior art is generally a solid shaft with steps, the solid shaft is fixedly connected with a rotor bracket, and an output shaft is connected with a driven shaft through a coupling. Due to the existence of the coupler, the installation space requirement of the equipment is large, if the coupler is used below the ground, the larger installation space of the equipment can cause the great increase of the use cost, for example, under the underground mining working condition, a larger roadway needs to be mined to ensure the enough installation space of the equipment, and the construction cost can be increased sharply.

Accordingly, a technical solution is desired to overcome or at least alleviate at least one of the above-mentioned drawbacks of the prior art.

SUMMERY OF THE UTILITY MODEL

It is an object of the present application to provide a motor drive shaft and a permanent magnet motor having the same that overcomes or at least alleviates at least one of the above-mentioned disadvantages of the prior art.

In order to achieve the above object, the present application provides a motor drive shaft, comprising:

the inner gear ring is provided with inner teeth;

one end of the central shaft is provided with external teeth matched with the internal teeth, and the other end of the central shaft is provided with a shaft sleeve; the part between the shaft sleeve and the external teeth is the body of the central shaft.

Optionally, a rolling bearing or a bearing bush is arranged between the inner gear ring and the central shaft, and the rolling bearing or the bearing bush is used for supporting the central shaft and the inner gear ring.

Optionally, the inner gear ring is provided with sealing covers at two axial ends thereof, the central shaft penetrates through one of the sealing covers, and a part of the inner gear ring, which is matched with the outer gear of the central shaft, is located between the two sealing covers.

Optionally, the shaft sleeve at one end of the central shaft is any one of a hydraulic shaft sleeve, a spline shaft sleeve or a thick-walled sleeve.

Optionally, a pressure sensor is disposed on the hydraulic sleeve, and the pressure sensor is used for detecting oil pressure in the hydraulic sleeve.

Optionally, the external teeth at one end of the central shaft are fixedly connected with the central shaft body in a detachable manner.

Optionally, the shaft sleeve at one end of the central shaft is fixedly connected with the central shaft body in a detachable manner.

Optionally, the central shaft is movable in an axial direction relative to the ring gear.

Optionally, the external teeth are crowned teeth.

The application also provides a permanent magnet motor, permanent magnet motor contains as above motor drive shaft.

The beneficial effects of the utility model reside in that:

the utility model discloses a motor drive shaft has integrateed the function of shaft coupling, and through using this motor drive shaft, the motor output shaft no longer needs the shaft coupling with being connected of driven shaft, and the motor can realize with the lug connection of driven shaft. Additionally, the utility model discloses a motor drive shaft has ingenious utilized the inner space of motor, places the motor inside in this motor drive shaft most, and only axle sleeve part stretches out, has saved the installation space of equipment.

Drawings

Fig. 1 is a schematic structural diagram of a motor drive shaft according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a motor drive shaft according to another embodiment of the present application.

Fig. 3 is a schematic structural diagram of a motor transmission shaft according to still another embodiment of the present application.

Fig. 4 is a schematic structural diagram of a permanent magnet motor according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a permanent magnet motor according to another embodiment of the present application.

1-an annular gear; 2-central axis; 3-sealing the cover; 4-sealing cover; 5-rolling bearings; 6-a retainer ring; 7-a motor transmission shaft; 8-a rotor shaft; 9-a rotor support; 10-a machine base; 11-internal teeth; 21-external teeth; 22-shaft sleeve; 23-a body; 111-a support cover; 112-rolling bearing.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner and are not to be considered limiting of the scope of the present application.

The first embodiment is as follows:

fig. 1 is a schematic structural diagram of a motor transmission shaft provided in this embodiment.

In the present embodiment, the motor transmission shaft includes a ring gear 1 and a central shaft 2.

The inner gear ring 1 is provided with involute inner teeth 11 in the axial direction of an inner hole; it will be appreciated that the shape of the internal teeth 11 may be other shapes, such as rectangular teeth, etc.

One end of the central shaft 2 is provided with an external tooth 21 matched with the internal tooth 11, and the external tooth 21 is a crowned tooth, so that the crowned tooth can provide larger error compensation and has low requirement on the axis centering precision of the internal gear ring 1 and the central shaft 2; the other end of the central shaft 2 is provided with a shaft sleeve 22, and the shaft sleeve 22 is a hydraulic shaft sleeve, so that the hydraulic shaft sleeve is convenient to connect with a connected driven shaft, and is quick to install and disassemble, time-saving and labor-saving; it can be understood that the hydraulic bushing has a thin inner layer and a thick outer layer, a hydraulic cavity is formed between the outer layer and the inner layer, when high-pressure oil is injected into the hydraulic cavity, the inner layer hydraulic bushing shrinks inwards due to the thick outer layer, so that the inserted shaft is locked; the part between the hydraulic bushing and the outer teeth 21 is the body 23 of the central shaft 2.

It will be appreciated that other configurations of the sleeve 22 are possible. For example, in an alternative embodiment, the sleeve 22 is configured as a thick-walled sleeve, which may be a cylindrical sleeve with an outer cylindrical surface or a thick-walled sleeve with an outer tapered surface; when the thick-wall sleeve is set to be a cylindrical shaft sleeve with an outer cylindrical surface, the inner unthreaded hole (actually a blind hole) is used for inserting the driven shaft, the outer cylindrical surface can be provided with a locking disc for locking the shaft sleeve and the driven shaft, and the locking disc can be a mechanical locking disc or a hydraulic locking disc. When the thick-wall sleeve is arranged to be a thick-wall sleeve with an outer conical surface, the driven shaft is inserted into the inner unthreaded hole, and the outer conical surface can be provided with a hub with a conical hole matched with the outer conical surface in a conical manner and used for locking the shaft sleeve and the driven shaft. It can be understood that the inner smooth hole of the shaft sleeve can be a cylindrical hole or a conical hole, and the cylindrical hole can be a stepped hole comprising a plurality of steps. In another alternative embodiment, sleeve 22 may also be provided as a sleeve having internal splines, which may be involute or rectangular splines.

In the present embodiment, the external teeth 21 are of a unitary structure with the sleeve 22 and the body 23. It is understood that, according to different requirements, in other embodiments, the three components may be configured as a split structure and fixedly connected. For example, in an alternative embodiment in which the outer teeth 21 are provided as a toothed disc structure, the inner bore of which engages the outer circumference of the body 23 and is connected by shear pins, the advantage is that the size of the toothed disc can only be increased in order not to increase the diameter of the body 23 of the central shaft 2 when the outer teeth 21 are of a size that does not allow for large torque transmission. In another embodiment, the sleeve 22 may also be fixedly attached to the body 23 in a removable manner, such as by bolts in the form of flanges or similar to the outer teeth 21, by shear pins.

It is understood that the combination of the external teeth 21, the sleeve 22 and the body 23 is not limited to the above examples. According to the actual situation, for example, the external teeth 21 and the body 23 are of an integral structure, and the sleeve 22 is fixedly connected with the body 23 in a detachable manner; the shaft sleeve 22 and the body 23 are of an integral structure, and the external teeth 21 and the body 23 are fixedly connected in a detachable mode; the external teeth 21, the shaft sleeve 22 and the body 23 are all independent structures and are fixedly connected in a detachable mode.

In this embodiment, the shaft sleeve 22 is a hydraulic shaft sleeve, and a wireless pressure sensor is installed on the hydraulic shaft sleeve, and the wireless pressure sensor is used for detecting the oil pressure in the hydraulic shaft sleeve, so that when pressure changes, an early warning can be performed to prevent equipment from breaking down.

In the embodiment, the ring gear 1 is fixedly connected with the rotor support in a detachable manner. It will be appreciated that the annulus gear 1 may also be fixedly connected in a detachable manner with the rotor shaft.

It can be understood that the connection of the ring gear 1 and the rotor support or the rotor shaft is not limited to the direct connection of the two, but may also be connected through an intermediate member; for example, the ring gear 1 is fixedly connected to a component a, which in turn is fixedly connected to a rotor carrier or a rotor shaft.

It will be appreciated that the central shaft 2 is movable in the axial direction relative to the ring gear 1 to compensate for axial errors of the device. In order to limit the axial movement amount of the central shaft 2, limit structures can be arranged at the two axial ends. As shown in the direction of fig. 1, a stopper may be provided at both ends of the internal teeth 11 to limit the amount of axial movement of the external teeth 21.

Through using the motor transmission shaft of this embodiment, when connecting the driven shaft, the driven shaft can direct insert in axle sleeve 22, does not need to install the shaft coupling alone, has reduced the spare part quantity of complete machine equipment, more need not maintain or change the shaft coupling.

Example two:

fig. 2 is a schematic structural diagram of a motor transmission shaft provided in this embodiment.

In the present embodiment, the motor transmission shaft includes an inner gear ring 1, a central shaft 2, a sealing cover 3, a sealing cover 4, a rolling bearing 5, and a retainer ring 6.

The axial position of the rolling bearing 5 is located between the external teeth 21 and the sleeve 22 for supporting the body 23 of the central shaft 2 and the ring gear 1. In the present embodiment, the rolling bearing 5 is a self-aligning rolling bearing, and the outer ring of the rolling bearing 5 is fixed, and the inner ring of the rolling bearing 5 is in clearance fit with the body 23. The rolling bearing has the advantages that after the rolling bearing 5 is installed, the external teeth 21 are matched with the internal teeth 11, the rolling bearing 5 is matched with the body 23, two matching points are equivalent to 2 supporting points provided for the central shaft 2, and the installation of the shaft sleeve 22 and the driven shaft is facilitated.

It can be understood that when the size of the central shaft 2 is larger, a hydraulic bearing adapter sleeve or a mechanical bearing adapter sleeve can be arranged between the rolling bearing 5 and the body 23 for better supporting the body 23 and positioning the bearing, which is advantageous in that the installation and the disassembly of the bearing are convenient.

It will be understood that the rolling bearing 5 may also take other configurations. For example, in an alternative embodiment, instead of the rolling bearing 5, a bearing shell is used, which is fixed in the axial direction on an internal gear ring.

The sealing cover 3 and the sealing cover 4 are respectively installed on two axial sides of the annular gear, in this embodiment, the sealing cover 3 is a cover with a through hole, the body 23 of the central shaft 2 penetrates through the sealing cover 3, a sealing element is arranged between the matching surfaces of the sealing cover 3 and the body 23, the sealing element can be an O-ring or an oil seal, and the matching part of the internal teeth 11 and the external teeth 21 and the position of the rolling bearing 5 in the axial direction are both located between the sealing cover 3 and the sealing cover 4. The sealing cover 4 is a blank cover as shown in the attached figure 2; sealing rings are arranged among matching surfaces of the sealing cover 3, the sealing cover 4 and the inner gear ring, it can be understood that the matching surfaces of the sealing cover 3, the sealing cover 4 and the inner gear ring can be radial matching surfaces or axial matching surfaces, and the sealing rings are O-shaped rings in the embodiment. The sealing cover 3, the inner gear ring 1, the sealing cover 4, the body 23 and the sealing elements between the matching surfaces form a sealed space, and lubricating oil or lubricating grease is stored in the sealed space and used for lubricating the meshing of the inner teeth and the outer teeth and the bearing.

It will be appreciated that the central shaft 2 is movable in the axial direction relative to the ring gear 1 to compensate for axial errors of the device. In order to limit the axial movement amount of the central shaft 2, limit structures can be arranged at the two axial ends. As shown in the direction of fig. 2, a stopper may be provided at both ends of the internal teeth 11 to limit the amount of axial movement of the external teeth 21.

In the present embodiment, the seal cover 4 may serve as a stopper surface for the right movement of the external teeth 21, and the rolling bearing 5 may serve as a stopper surface for the left movement of the external teeth 21.

Through using the motor drive shaft of this embodiment, when connecting the driven shaft, the driven shaft can the disect insertion axle sleeve 22 in to through hydraulic pressure locking, need not install the shaft coupling alone, reduced the spare part quantity of complete machine equipment, more need not maintain or change the shaft coupling. The problem that the traditional coupler needs heating when being mounted and dismounted is avoided, and the maintenance-free requirement is met.

Example three:

fig. 3 is a schematic structural diagram of a motor transmission shaft provided in this embodiment.

One end of the central shaft 2 is provided with an external tooth 21 matched with the internal tooth 11, and the external tooth 21 is a crowned tooth, so that the crowned tooth can provide larger error compensation and has low requirement on the axis centering precision of the internal gear ring 1 and the central shaft 2; the other end of the central shaft 2 is provided with a shaft sleeve 22, the shaft sleeve 22 is a thick-walled sleeve with an outer cylindrical surface, a connected driven shaft is inserted into an inner hole of the thick-walled sleeve, a locking disc is arranged on the outer cylindrical surface to lock the shaft sleeve and the driven shaft so as to transmit torque, and the locking disc can be a mechanical locking disc or a hydraulic locking disc; the portion between the sleeve 22 and the outer teeth 21 is the body 23 of the central shaft 2.

It will be appreciated that other configurations of the sleeve 22 are possible. For example, in an alternative embodiment, the sleeve 22 is configured as a thick-walled sleeve with an outer conical surface, the driven shaft is inserted into the inner optical hole, and a hub with a tapered hole can be mounted on the outer conical surface to match the taper of the outer conical surface, so as to lock the sleeve and the driven shaft. It can be understood that the inner smooth hole of the shaft sleeve can be a cylindrical hole or a conical hole, and the cylindrical hole can be a stepped hole comprising a plurality of steps. In another alternative embodiment, sleeve 22 may also be provided as a thick-walled sleeve having internal splines, which may be involute or rectangular splines.

In this embodiment, the shaft sleeve 22 is a hydraulic shaft sleeve, and a wireless pressure sensor is installed on the hydraulic shaft sleeve, and the wireless pressure sensor is used for detecting the oil pressure in the hydraulic shaft sleeve, and when pressure changes, an early warning can be performed to prevent the equipment from breaking down.

Through using the motor drive shaft of this embodiment, when connecting the driven shaft, the driven shaft can the disect insertion axle sleeve 22 in to through locking dish locking, need not install the shaft coupling alone, reduced the spare part quantity of complete machine equipment, more need not maintain or change the shaft coupling. Avoids the problem that the traditional coupler needs heating when being assembled and disassembled, realizes the maintenance-free requirement,

example four:

the utility model also provides a permanent-magnet machine with above-mentioned motor drive shaft. Fig. 4 is a schematic diagram of a permanent magnet motor with the motor transmission shaft according to the embodiment.

In this embodiment, the motor transmission shaft 7 is fixedly connected with the rotor bracket 9, the motor transmission shaft 7 is fixedly supported on the support cover 111 through the inner gear ring, the support cover 111 is fixedly connected with the motor base 10, the rolling bearing 112 is arranged between the support cover 111 and the motor transmission shaft 7, and the rolling bearing 112 is a self-aligning rolling bearing. The rotor shaft 8 is fixedly connected with the rotor bracket 9, and the structure in the existing motor can be adopted, and the details are not repeated here.

It is understood that, in the present embodiment, the support covers 111 on the left and right sides of the drawing may be different. The supporting cover 111 that motor drive shaft 7 passed can be the end cover of motor output shaft side, is provided with alignment tang structure on this end cover for motor drive shaft 7 carries out the alignment when the motor is installed.

It can be understood that the drawings of the present embodiment are only schematic diagrams, the structure in the drawings cannot be understood as a limitation to the technical solution, and the motor transmission shaft may also be connected with the motor main body by using other structures.

Through adopting the utility model provides a motor drive shaft, permanent-magnet machine can realize and by drive arrangement's lug connection as drive arrangement, and no longer need install the shaft coupling. In addition, because the motor transmission shaft 7 is mostly arranged in the permanent magnet motor, only part of the rotor shaft in the existing structure is replaced, and the space of the existing structure is occupied, so that the length of the driving unit can be shortened. If the permanent magnet motor works under the underground mining condition, a wider roadway does not need to be opened up for installing the driving unit, and the mining cost of resources is greatly saved.

Example five:

the utility model also provides a permanent-magnet machine with above-mentioned motor drive shaft. Fig. 5 is a schematic diagram of a permanent magnet motor with the motor transmission shaft according to the embodiment.

In this embodiment, a flange is disposed at one end of the rotor shaft 8, the motor transmission shaft 7 is fixedly connected with the flange of the rotor shaft 8 in a detachable manner, the motor transmission shaft 7 is fixedly supported on the supporting cover 111 through an inner gear ring, the supporting cover 111 is fixedly connected with the motor base 10, a rolling bearing 112 is disposed between the supporting cover 111 and the motor transmission shaft 7, and the rolling bearing 112 is a self-aligning rolling bearing. The rotor shaft 8 is fixedly connected with the rotor bracket 9, and the connection can adopt the structure in the existing motor, and the details are not repeated.

Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present application, and are not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. A motor drive shaft, comprising:

the inner gear ring is provided with inner teeth;

2. The motor drive shaft of claim 1 wherein a rolling bearing or a bearing shoe is disposed between said inner gear ring and said central shaft, said rolling bearing or bearing shoe supporting said central shaft and said inner gear ring.

3. The motor transmission shaft according to claim 1 or 2, wherein the inner ring gear is provided at both axial ends thereof with seal covers, the center shaft passes through one of the seal covers, and the portion where the inner teeth of the inner ring gear and the outer teeth of the center shaft fit is located between the two seal covers.

4. The motor drive shaft of claim 3 wherein the hub at one end of the central shaft is any one of a hydraulic hub, a splined hub, or a thick walled sleeve.

5. The motor-driven shaft according to claim 4, wherein a pressure sensor is provided on the hydraulic bushing for detecting an oil pressure in the hydraulic bushing.

6. The motor drive shaft of claim 4 or 5 wherein the external teeth at one end of the central shaft are removably fixedly attached to the central shaft body.

7. The motor drive shaft of claim 6 wherein said hub at one end of said central shaft is removably and fixedly connected to said central shaft body.

8. The motor drive shaft of claim 7 wherein said central shaft is axially movable relative to said ring gear.

9. The motor drive shaft of claim 8 wherein said external teeth are crowned teeth.

10. A permanent magnet electric machine comprising a machine drive shaft according to claim 9.