CN220254287U - an electric drive device - Google Patents

Abstract

The utility model relates to the technical field of motors and discloses an electric driving device which comprises a rotor shaft, a speed reducer output shaft and a noise reduction elastic piece, wherein the rotor shaft is coaxially connected with the speed reducer output shaft through the noise reduction elastic piece, the rotor shaft is provided with a first connecting surface, the speed reducer output shaft is provided with a second connecting surface opposite to the first connecting surface, a movable gap is reserved between the first connecting surface and the second connecting surface in the axial direction, at least one of the first connecting surface and the second connecting surface is provided with a limiting protection groove, and one end of the noise reduction elastic piece is installed in the limiting protection groove. The electric driving device provided by the utility model can avoid crushing or fatigue fracture caused by long-time overload operation of the elastic piece.

Description

an electric drive device

Technical field

The utility model relates to the technical field of motors, and in particular to an electric drive device.

Background technique

In the past, wave springs were added to the bearings of the motor to improve the vibration and noise problems caused by axial movement. However, if the external impact excitation to the wave spring is too large, the load on the wave spring will exceed its limit value, and the load will exceed its limit value for a long time. Crushing and fatigue fracture may occur after work.

Utility model content

Aiming to solve at least one of the technical problems existing in the existing technology. The utility model provides an electric driving device to prevent elastic parts from being crushed or fatigued due to long-term overload work.

In order to achieve the above purpose, the present utility model provides an electric drive device, which includes a rotor shaft, a reducer output shaft and a noise reduction elastic member. The rotor shaft and the reducer output shaft are coaxial through the noise reduction elastic member. connection, the rotor shaft is provided with a first connection surface, the reducer output shaft is provided with a second connection surface opposite to the first connection surface, the first connection surface and the second connection surface are on the shaft. There is a movable gap in the direction, and at least one of the first connection surface and the second connection surface is provided with a limit protection groove, and one end of the noise reduction elastic member is installed in the limit protection groove.

As a preferred solution, the length of the movable gap in the axial direction is set at 0.5mm-2.5mm.

As a preferred solution, the noise reduction elastic member and the limiting protection groove are each annular.

As a preferred solution, the first connection surface or the second connection surface is provided with the limit protection groove, the length of the noise reduction elastic member in the axial direction is a, and the depth of the limit protection groove is b, b=0.4a-0.7a.

As a preferred solution, the second connecting surface is provided with a mounting shaft hole along the axial direction, the rotor shaft includes a coaxially connected connecting shaft and a shaft body, and the connecting shaft is installed in the mounting shaft hole.

As a preferred solution, the rotor shaft further includes a connecting platform, the connecting shaft is connected to the shaft body through the connecting platform, the first connecting surface is provided on the connecting platform, and the first connecting surface is on the shaft. The projection on the body is larger than the projection of the second connecting surface on the shaft body.

As a preferred solution, the electric drive device further includes a motor housing, and the rotor shaft and the reducer output shaft are rotationally connected in the motor housing.

As a preferred solution, the motor housing is provided with a first bearing and a second bearing, the reducer output shaft is rotationally connected to the motor housing through the first bearing, and the rotor shaft is away from the reduction gear. One end of the output shaft of the motor is rotationally connected to the motor housing through the second bearing.

As a preferred solution, the motor housing is provided with a first installation groove and a second installation groove, the first bearing is installed in the first installation groove, and the second bearing is installed in the second installation groove.

As a preferred solution, the noise reduction elastic member is a corrugated gasket.

Compared with the existing technology, the electric drive device according to the embodiment of the present invention has the beneficial effect that: the two ends of the noise reduction elastic member are in contact with the rotor shaft and the reducer output shaft respectively, and the noise reduction elastic member is located in the axial direction. Between the rotor shaft and the reducer output shaft, during assembly, the noise reduction elastic member undergoes elastic deformation to have a certain amount of compression, providing preload force to the rotor shaft and the reducer output shaft to improve the axial movement caused by vibration and noise problems. The first connection surface and the second connection surface are arranged axially opposite to each other. The first connection surface and the second connection surface have a movable gap in the axial direction. The movable gap is used to control the maximum compression amount of the noise reduction elastic member, located at The noise reduction elastic member in the movable gap provides a certain amount of axial movement for the rotor shaft and the reducer output shaft. At least one of the first connection surface and the second connection surface is provided with a limited protection groove. The noise reduction One end of the elastic member is installed in the limit protection groove, and a part of the noise reduction elastic member in the axial direction is installed in the limit protection groove. The noise reduction elastic member located in the limit protection groove can avoid overload compression and cause compression. Collapse or fatigue fracture. A limit protection groove is directly provided on the rotor shaft and/or the reducer output shaft, eliminating the need for additional components, low improvement cost, and simple production process.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of an embodiment of the present utility model.

Figure 2 is a schematic structural diagram of position A in Figure 1 according to the embodiment of the present invention.

Figure 3 is a schematic structural diagram of the output shaft of the reducer equipped with bearings according to the embodiment of the present invention.

Figure 4 is a schematic structural diagram of the rotor shaft according to the embodiment of the present invention.

Figure 5 is a schematic structural diagram of the motor housing according to the embodiment of the present invention.

In the picture:

10. Rotor shaft; 11. First connection surface; 12. Limit protection groove; 13. Connection shaft; 14. Shaft body; 15. Connection platform;

20. Reducer output shaft; 21. Second connection surface; 22. Installation shaft hole;

30. Noise reduction elastic parts; 31. Activity gap;

40. Motor housing; 41. First bearing; 42. First end bearing; 43. Second end bearing; 44. Second bearing; 45. First mounting slot; 46. Second mounting slot.

Detailed ways

The specific implementation manner of the present utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not used to limit the scope of the present invention.

In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal" are used in the present utility model. ", "top", "bottom", "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than instructions. Or it is implied that the device or component mentioned must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

In the description of the present utility model, it should be understood that the terms "connected", "connected", "fixed" and other terms used in the present utility model should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated; it can be a mechanical connection or a welding connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components or an interaction between two components, unless otherwise specified restrictions. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

As shown in Figures 1 to 5, an electric drive device according to a preferred embodiment of the present invention includes a rotor shaft 10, a reducer output shaft 20, and a noise reduction elastic member 30. The rotor shaft 10 and the reducer output shaft 20 Through the coaxial connection of the noise reduction elastic member 30, the rotor shaft 10 is provided with a first connection surface 11, and the reducer output shaft 20 is provided with a second connection surface 21 opposite to the first connection surface 11. The first connection surface 11 is connected to the second connection surface 11. The connecting surface 21 has a movable gap 31 in the axial direction. At least one of the first connecting surface 11 and the second connecting surface 21 is provided with a limiting protection groove 12 . One end of the noise reduction elastic member 30 is installed in the limiting protection groove 12 .

In the electric drive device of the present invention, both ends of the noise reduction elastic member 30 are in contact with the rotor shaft 10 and the reducer output shaft 20 respectively. The noise reduction elastic member 30 is located between the rotor shaft 10 and the reducer output shaft 20 in the axial direction. During assembly, the noise reduction elastic member 30 elastically deforms to have a certain amount of compression, providing preload force to the rotor shaft 10 and the reducer output shaft 20 to improve vibration and noise problems caused by axial movement. The first connection surface 11 and the second connection surface 21 are axially opposite to each other. The first connection surface 11 and the second connection surface 21 have a movable gap 31 in the axial direction. The movable gap 31 is used to control the maximum compression of the noise reduction elastic member 30 The noise reduction elastic member 30 located in the movable gap 31 provides a certain amount of axial movement for the rotor shaft 10 and the reducer output shaft 20. At least one of the first connection surface 11 and the second connection surface 21 is provided with a limited protection groove. 12. One end of the noise reduction elastic member 30 is installed in the limit protection groove 12. A part of the noise reduction elastic member 30 in the axial direction is installed in the limit protection groove 12. The noise reduction elastic member 30 located in the limit protection groove 12 It can avoid crushing or fatigue fracture caused by overload compression. The limit protection groove 12 is directly provided on the rotor shaft 10 and/or the reducer output shaft 20, without adding additional components, the improvement cost is low, and the production process is simple.

Further, as shown in Figure 2, the length of the movable gap 31 in the axial direction is set at 0.5mm-2.5mm. The movable gap 31 is set within an appropriate range to prevent the noise reduction elastic member 30 from being crushed or fatigued due to overload.

Further, as shown in FIG. 1 , the limit protection groove 12 and the noise reduction elastic member 30 are coaxially arranged with the rotor shaft 10 . The noise reduction elastic member 30 and the limit protection groove 12 are respectively annular, so that the noise reduction elastic member 30 A relatively uniform pre-tightening force is provided to the first connecting surface 11 and the second connecting surface 21 .

Further, as shown in Figures 1 to 2, the first connection surface 11 or the second connection surface 21 is provided with a limit protection groove 12, the length of the noise reduction elastic member 30 in the axial direction is a, and the limit protection groove 12 is The depth is b, b=0.4a-0.7a. The limit protection groove 12 is provided with a certain depth. The limit protection groove 12 provides an installation space for the noise reduction elastic member 30. The shape of the protection groove is adapted to the outer contour shape of the noise reduction elastic member 30. It is arranged in the circumferential and axial directions. The noise reduction elastic members 30 are respectively limited. At the same time, at least a part of the noise reduction elastic member 30 is located in the movable gap 31 to provide a certain amount of elastic deformation activity for the rotor shaft 10 and the reducer output shaft 20 to avoid the rotor shaft 10 and the deceleration. The output shaft 20 of the machine produces abnormal noise due to axial movement.

Further, as shown in FIG. 3 , the second connecting surface 21 is provided with a mounting shaft hole 22 along the axial direction. The rotor shaft 10 includes a coaxially connected connecting shaft 13 and a shaft body 14 . The connecting shaft 13 is installed in the mounting shaft hole 22 . The connecting shaft 13 of the rotor shaft 10 is installed in the mounting shaft hole 22 to realize coaxial connection with the reducer output shaft 20 and improve the connection stability between the reducer output shaft 20 and the rotor shaft 10 . Among them, since the second connection surface 21 is provided with a mounting shaft hole 22 and the second connection surface 21 is annular, one end of the noise reduction elastic member 30 abuts the second connection surface 21 to provide uniform pre-tightening for the second connection surface 21 force.

Further, as shown in Figure 4, the rotor shaft 10 also includes a connecting platform 15. The connecting shaft 13 is connected to the shaft body 14 through the connecting platform 15. The first connecting surface 11 is provided on the connecting platform 15. The first connecting surface 11 is on the shaft body. The projection on 14 is larger than the projection of the second connecting surface 21 on the shaft 14 . The diameter of the connecting platform 15 is larger than the diameter of the reducer output shaft 20, so that the limit protection groove 12 is located on the connecting platform 15, and the rotor shaft 10 can still maintain good impact resistance and is not easily deformed, reducing safety hazards.

As one embodiment, as shown in FIG. 4 , the limiting protection groove 12 is only provided on the first connection surface 11 , the first connection surface 11 is provided on the connection platform 15 , and one end of the noise reduction elastic member 30 is connected to the second connection surface. 21. The other end of the noise reduction elastic member 30 is connected to the limiting protection groove 12. The manufacturing process is simple and the production cost is low.

Further, as shown in FIG. 5 , the electric drive device also includes a motor housing 40 , in which the rotor shaft 10 and the reducer output shaft 20 are rotatably connected. The motor housing 40 supports and protects the rotor shaft 10 and the reducer output shaft 20 to prevent the rotor shaft 10 and the reducer output shaft 20 from being damaged by foreign objects.

Further, as shown in Figures 1 to 2, the motor housing 40 is provided with a first bearing 41 and a second bearing 44. The reducer output shaft 20 is rotationally connected to the motor housing 40 through the first bearing 41. The rotor shaft 10 The end away from the reducer output shaft 20 is rotationally connected to the motor housing 40 through the second bearing 44, so that the reducer output shaft 20 and the rotor shaft 10 rotate relative to the motor housing 40 respectively, and the reducer output shaft 20 is lifted. The rotation with the rotor shaft 10 is smoother.

As one embodiment, as shown in FIG. 3 , the first bearing 41 includes a first end bearing 42 and a second end bearing 43 . One end of the reducer output shaft 20 is connected to the first end bearing 42 . The other end is connected to the second end bearing 43, so that the rotation force of the reducer output shaft 20 is more uniform and the rotation is smoother.

Further, as shown in Figure 5, the motor housing 40 is provided with a first installation groove 45 and a second installation groove 46. The first bearing 41 is installed in the first installation groove 45, and the second bearing 44 is installed in the second installation groove. 46. The first installation groove 45 provides an installation space for the first bearing 41 , and the second installation groove 46 provides an installation space for the second bearing 44 to limit and fix the reducer output shaft 20 and the rotor shaft 10 .

Further, as shown in FIGS. 1 to 2 , the noise reduction elastic member 30 is a corrugated gasket. Corrugated gaskets are low-cost to produce and easy to assemble. The corrugated gasket is inserted into the connecting shaft 13. One end of the corrugated gasket is installed in the limit protection groove 12 of the connecting platform 15. The other end of the corrugated gasket presses against the second connecting surface 21. Since only one corrugated gasket is required to be installed, Therefore, the assembly efficiency is high, which helps to improve production efficiency.

In summary, the embodiment of the present invention provides an electric drive device. The two ends of the noise reduction elastic member 30 are in contact with the rotor shaft 10 and the reducer output shaft 20 respectively. The noise reduction elastic member 30 is located on the rotor shaft 10 in the axial direction. Between the reducer output shaft 20 and the noise reduction elastic member 30 during assembly, the noise reduction elastic member 30 undergoes elastic deformation to have a certain amount of compression, providing preload force to the rotor shaft 10 and the reducer output shaft 20 to improve the axial movement caused by causing vibration and noise problems. The first connection surface 11 and the second connection surface 21 are axially opposite to each other. The first connection surface 11 and the second connection surface 21 have a movable gap 31 in the axial direction. The movable gap 31 is used to control the maximum compression of the noise reduction elastic member 30 The noise reduction elastic member 30 located in the movable gap 31 provides a certain amount of axial movement for the rotor shaft 10 and the reducer output shaft 20. At least one of the first connection surface 11 and the second connection surface 21 is provided with a limited protection groove. 12. One end of the noise reduction elastic member 30 is installed in the limit protection groove 12. A part of the noise reduction elastic member 30 in the axial direction is installed in the limit protection groove 12. The noise reduction elastic member 30 located in the limit protection groove 12 It can avoid crushing or fatigue fracture caused by overload compression. The limit protection groove 12 is directly provided on the rotor shaft 10 and/or the reducer output shaft 20, without adding additional components, the improvement cost is low, and the production process is simple.

The above are only the preferred embodiments of the present invention. It should be pointed out that those of ordinary skill in the art can also make several improvements and substitutions without departing from the technical principles of the present utility model. These improvements and substitutions It should also be regarded as the protection scope of the present utility model.

Claims (10)

1. An electric drive device characterized in that: including rotor shaft and reduction gear output shaft and noise reduction elastic component, the rotor shaft with the reduction gear output shaft passes through noise reduction elastic component coaxial coupling, the rotor shaft is equipped with first joint face, the reduction gear output shaft be equipped with the second joint face that first joint face is relative, first joint face with the second joint face has the clearance in axial direction, first joint face with at least one of second joint face is equipped with spacing protection groove, noise reduction elastic component's one end install in spacing protection inslot.

2. An electric drive as claimed in claim 1, characterized in that: the length of the movable gap in the axial direction is set to be 0.5mm-2.5mm.

3. An electric drive as claimed in claim 1, characterized in that: the noise reduction elastic piece and the limit protection groove are respectively annular.

4. An electric drive as claimed in claim 1, characterized in that: the first connecting surface or the second connecting surface is provided with the limit protection groove, the length of the noise reduction elastic piece in the axial direction is a, the depth of the limit protection groove is b, and b=0.4a-0.7a.

5. An electric drive as claimed in claim 1, characterized in that: the second connecting surface is provided with a mounting shaft hole along the axial direction, the rotor shaft comprises a connecting shaft and a shaft body which are coaxially connected, and the connecting shaft is mounted in the mounting shaft hole.

6. An electric drive as claimed in claim 5, characterized in that: the rotor shaft further comprises a connecting platform, the connecting shaft is connected with the shaft body through the connecting platform, the first connecting surface is arranged on the connecting platform, and the projection of the first connecting surface on the shaft body is larger than the projection of the second connecting surface on the shaft body.

7. The electric drive of claim 6, wherein: the electric drive device further comprises a motor shell, and the rotor shaft and the output shaft of the speed reducer are rotationally connected in the motor shell.

8. An electric drive as claimed in claim 7, characterized in that: the motor housing is provided with a first bearing and a second bearing, the speed reducer output shaft is rotationally connected with the motor housing through the first bearing, and one end of the rotor shaft, which is far away from the speed reducer output shaft, is rotationally connected with the motor housing through the second bearing.

9. An electric drive as claimed in claim 8, characterized in that: the motor housing is provided with a first mounting groove and a second mounting groove, the first bearing is mounted in the first mounting groove, and the second bearing is mounted in the second mounting groove.

10. An electric drive as claimed in claim 1, characterized in that: the noise reduction elastic piece is a waveform gasket.