Electric drive assembly and power equipment
By designing an electric drive assembly, using mounting plates and support members to support the shafts of the motor and reducer, the reducer vibration problem caused by radial jump of the motor output shaft is solved, and the effect of reducing energy loss and wear and extending the life of the reducer is achieved.
Patent Information
- Application Number
- CN202421332251.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-06-12
AI Technical Summary
During long-term operation of existing motor products, the output shaft has radial jumping, which leads to synchronous jumping of the harmonic reducer, increases the vibration of the transmission system, reduces the accuracy of movement, aggravates the wear of parts, and shortens the service life.
An electric drive assembly is designed, including a mounting plate, a motor, a reducer and a support member. The drive shaft of the motor is coaxially connected to the input shaft of the reducer, and is rotatably connected to the mounting plate through the support member to support the input shaft and the drive shaft to eliminate radial jumps.
Effectively eliminate harmonic reducer vibration caused by radial jump of the wave generator, reduce unnecessary energy loss and abnormal wear of the reducer, improve the efficiency of the reducer, and extend its service life.
Smart Images
Figure CN222839515U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, and in particular to an electric drive assembly and power equipment. Background Art
[0002] In the current field of robotics, as a key transmission component, the design and application of harmonic reducers have attracted widespread attention. The commonly used structural design idea of the input end of harmonic reducers is to directly connect the output shaft of the motor to the wave generator in the reducer.
[0003] Although this configuration method achieves simplicity in structure, it exposes some significant technical bottlenecks in practical application. The output shafts of motor products on the market, especially during long-term operation, often have varying degrees of radial runout. When the motor output shaft is directly connected to the wave generator of the harmonic reducer, the radial runout of the drive shaft will inevitably be transmitted to the wave generator, causing the synchronous runout of the wave generator.
[0004] This kind of jumping will increase the vibration amplitude of the transmission system, resulting in reduced movement accuracy of the robot; secondly, continuous irregular vibration aggravates the wear between components and reduces transmission efficiency; finally, long-term accumulation of mechanical stress may also shorten the service life of the harmonic reducer and even the entire robot system. Utility Model Content
[0005] The main purpose of the utility model is to provide an electric drive assembly and a power device, aiming at reducing the vibration of a reducer.
[0006] In order to achieve the above-mentioned purpose, the utility model proposes an electric drive assembly, comprising:
[0007] Mounting plate;
[0008] The motor comprises a housing and a driving shaft arranged on the housing, wherein the housing is fixed on the mounting plate;
[0009] A reducer, comprising a housing and an input shaft arranged on the housing, wherein the housing is fixed to the mounting plate, and the input shaft is coaxially connected to the driving shaft;
[0010] A support member, at least one of the input shaft and the drive shaft is rotatably connected to the mounting plate through the support member to support the input shaft and the drive shaft.
[0011] In one embodiment, the mounting plate has a through hole, the housing is fixed to one side end surface of the through hole, the outer shell is fixed to the other side end surface of the through hole, the input shaft extends into the through hole and is connected to the drive shaft, and the support member is disposed in the through hole and is rotatably connected to the input shaft.
[0012] In one embodiment, the support member is configured as a bearing, and the input shaft is rollingly connected to the through hole through the bearing.
[0013] In one embodiment, a support body is protruded from the inner wall of the through hole, and the support body extends around the center of the through hole. The support body abuts against the side wall of the bearing to limit the bearing.
[0014] In one embodiment, a shoulder is protruding from the outer peripheral wall of the input shaft, and the shoulder cooperates with the support body to clamp the bearing.
[0015] In one embodiment, the electric drive assembly further includes an elastic member, which is disposed on a side of the support body facing the bearing, and the elastic member elastically abuts against the bearing.
[0016] In one embodiment, the elastic member is configured as a wave spring.
[0017] In one embodiment, a first sealing groove is provided on the end surface of the mounting plate facing the casing, and a second sealing groove is provided on the end surface of the mounting plate facing the outer shell. The first sealing groove and the second sealing groove are both arranged around the through hole. The first sealing groove is used to embed a sealing ring to seal the connection between the casing and the mounting plate, and the second sealing groove is used to embed a sealing ring to seal the connection between the outer shell and the mounting plate.
[0018] In one embodiment, at least one of the casing and the outer shell is screwed and fixed to the mounting plate; and / or, the mounting plate is provided with a limiting portion protruding toward the side of the reducer, and the limiting portion cooperates with the outer shell to limit the radial position of the outer shell on the mounting plate.
[0019] The utility model also provides a power device, comprising the electric drive assembly mentioned above.
[0020] Compared with the prior art, in the technical solution of the utility model, the electric drive assembly includes a mounting plate, on which a motor and a reducer are arranged, wherein the motor has a casing and a drive shaft arranged on the casing, the casing is fixed on the mounting plate, and the reducer has a shell and an input shaft arranged on the shell, the shell is fixed on the mounting plate, and the input shaft is coaxially connected with the drive shaft; in addition, the electric drive assembly also includes a support member, which is arranged on the mounting plate, and at least one of the input shaft and the drive shaft is rotatably connected to the mounting plate through the support member, which is equivalent to the mounting plate providing support for the input shaft and the drive shaft through the support member, thereby eliminating the vibration of the harmonic reducer caused by the radial runout of the wave generator, thereby reducing unnecessary energy loss and abnormal wear of the reducer, improving the efficiency of the reducer, and extending the life of the reducer. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0022] Figure 1 A structural schematic diagram of an embodiment of an electric drive assembly provided by the utility model;
[0023] Figure 2 A cross-sectional schematic diagram of an embodiment of an electric drive assembly provided by the utility model;
[0024] Figure 3 This is a schematic structural diagram of the mounting plate and support member in the electric drive assembly provided by the utility model.
[0025] Description of Figure Numbers:
[0026] 100, mounting plate; 110, through hole; 120, support body; 130, first sealing groove; 140, second sealing groove; 150, limit part; 200, motor; 210, housing; 220, drive shaft; 300, reducer; 310, housing; 320, input shaft; 400, support member; 500, elastic member.
[0027] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0029] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0031] In order to reduce the radial vibration of the reducer 300, the technical solution proposes an electric drive assembly, including:
[0032] Mounting plate 100;
[0033] The motor 200 has a housing 210 and a driving shaft 220 disposed on the housing 210 , and the housing 210 is fixed on the mounting plate 100 ;
[0034] The reducer 300 comprises a housing 310 and an input shaft 320 disposed on the housing 310 . The housing 310 is fixed on the mounting plate 100 . The input shaft 320 is coaxially connected with the driving shaft 220 .
[0035] The support member 400 , at least one of the input shaft 320 and the drive shaft 220 are rotatably connected to the mounting plate 100 through the support member 400 to support the input shaft 320 and the drive shaft 220 .
[0036] Compared with the prior art, in the technical solution of the utility model, the electric drive assembly includes a mounting plate 100, on which a motor 200 and a reducer 300 are arranged, wherein the motor 200 has a housing 210 and a drive shaft 220 arranged on the housing 210, the housing 210 is fixed on the mounting plate 100, and the reducer 300 has a shell 310 and an input shaft 320 arranged on the shell 310, the shell 310 is fixed on the mounting plate 100, and the input shaft 320 is coaxially connected with the drive shaft 220; in addition, the electric drive The assembly also includes a support member 400, which is disposed on the mounting plate 100. At least one of the input shaft 320 and the drive shaft 220 is rotatably connected to the mounting plate 100 through the support member 400. This is equivalent to the mounting plate 100 providing support for the input shaft 320 and the drive shaft 220 through the support member 400, thereby eliminating the vibration of the harmonic reducer 300 caused by the radial runout of the wave generator, thereby reducing unnecessary energy loss and abnormal wear of the reducer 300, improving the efficiency of the reducer 300, and extending the life of the reducer 300.
[0037] Specifically, Figures 1 to 3 In the technical solution of the present utility model, the casing 210 of the motor 200 and the outer shell 310 of the reducer 300 can be fixed on the mounting plate 100 by screwing or welding, and the driving shaft 220 of the motor 200 is coaxially arranged and connected with the input shaft 320 of the reducer 300. In addition, the support member 400 can be a bearing or other component, and the input shaft 320 is rotatably connected to the mounting plate 100 through the support member 400. In this way, the mounting plate 100 can provide support for the input shaft 320 and the driving shaft 220 through the support member 400 to prevent the input shaft 320 from radially shaking relative to the outer shell 310, thereby helping to extend the service life of the reducer 300.
[0038] like Figure 2 In one embodiment of the utility model, the mounting plate 100 has a through hole 110, the housing 210 is fixed to one side end surface of the through hole 110, the outer shell 310 is fixed to the other side end surface of the through hole 110, the input shaft 320 extends into the through hole 110 and is connected to the drive shaft 220, and the support member 400 is disposed in the through hole 110 and is rotatably connected to the input shaft 320. The size of the through hole 110 is larger than that of the input shaft 320. The outer shell 310 and the housing 210 are respectively fixed on the end faces on opposite sides of the through hole 110 to seal the through hole 110. The input shaft 320 and the drive shaft 220 both extend into the through hole 110. The drive shaft 220 penetrates into the input shaft 320 and is fixed to achieve a coaxial connection between the input shaft 320 and the drive shaft 220. In addition, in the present embodiment, the support member 400 can be a device such as a bearing. The support member 400 is arranged in the through hole 110 and connected to the input shaft 320. This can reduce the overall size of the electric drive assembly and improve the lightweight of the electric drive assembly.
[0039] like Figure 2 In one embodiment of the utility model, the support member 400 is configured as a bearing, and the input shaft 320 is rollingly connected to the through hole 110 through the bearing. The bearing can be a deep groove ball rolling bearing, and the input shaft 320 can be rollingly connected to the through hole 110 through the bearing. This can reduce the friction between the input shaft 320 and the through hole 110, which is beneficial to improving the efficiency of the motor 200 and the reducer 300.
[0040] like Figure 2 In one embodiment of the utility model, a support body 120 is convexly provided on the inner wall of the through hole 110. The support body 120 extends around the center of the through hole 110. The support body 120 abuts against the side wall of the bearing to limit the bearing. The support body 120 can be integrally formed with the mounting plate 100. The support body 120 abuts against the bottom end of the bearing to provide support for the bearing and limit the bearing. This can facilitate the positioning of the bearing in the through hole 110, and also ensure that the bearing can maintain a stable position when the electric drive assembly is working, thereby improving the reliability of the electric drive assembly.
[0041] like Figure 2 In one embodiment of the utility model, a shoulder is convexly provided on the outer peripheral wall of the input shaft 320, and the shoulder cooperates with the support body 120 to clamp the bearing; in this embodiment, the bearing has an inner ring and an outer ring, wherein the inner ring of the bearing is sleeved on the input shaft 320, the shoulder abuts against the side wall of the inner ring, the outer ring cooperates with the inner wall of the through hole 110, and the support body 120 abuts against the side wall of the outer ring, so that the shoulder and the support body 120 cooperate to clamp the bearing, thereby limiting the relative axial shaking of the outer ring and the inner ring, and improving the stability of the electric drive assembly during operation.
[0042] like Figure 2 In one embodiment of the utility model, the electric drive assembly further includes an elastic member 500, which is disposed on the side of the support body 120 facing the bearing, and the elastic member 500 elastically abuts against the bearing. The elastic member 500 may be an axial compression spring, and the bearing and the support body 120 cooperate to clamp the elastic member 500. The arrangement of the elastic member 500 can ensure that when the shaft shoulder and the support body 120 clamp the bearing, the axial clearance between the outer ring and the inner ring of the bearing can be completely eliminated, thereby further preventing the bearing and the input shaft 320 from shaking in the axial direction.
[0043] like Figure 2 In one embodiment of the present invention, the elastic member 500 is configured as a wave spring. This can reduce the overall thickness of the elastic member 500 as much as possible, thereby reducing the overall thickness of the electric drive assembly.
[0044] Furthermore, a first sealing groove 130 is provided on the end surface of the mounting plate 100 facing the casing 210, and a second sealing groove 140 is provided on the end surface of the mounting plate 100 facing the outer shell 310. The first sealing groove 130 and the second sealing groove 140 are both arranged around the through hole 110. The first sealing groove 130 is used to embed a sealing ring to seal the connection between the casing 210 and the mounting plate 100, and the second sealing groove 140 is used to embed a sealing ring to seal the connection between the outer shell 310 and the mounting plate 100. In order to improve the working reliability of the electric drive assembly, an annular first sealing groove 130 is provided on the end surface of the mounting plate 100 facing the housing 210, and a sealing ring is embedded in the first sealing groove 130, and the sealing ring is sealed with the end surface of the housing 210 and the mounting plate 100. An annular second sealing groove 140 is provided on the end surface of the mounting plate 100 facing the outer shell 310, and a sealing ring is embedded in the second sealing groove 140, and the sealing ring is sealed with the end surface of the outer shell 310 and the mounting plate 100. The first sealing groove 130, the second sealing groove 140 and the through hole 110 are coaxially arranged, so that the through hole 110 and the input shaft 320 and the drive shaft 220 in the through hole 110 can be isolated from the external environment to prevent dust and water vapor from entering, thereby improving the working reliability of the electric drive assembly.
[0045] In one embodiment of the utility model, at least one of the housing 210 and the outer shell 310 is screwed and fixed to the mounting plate 100, so that the assembly of the electric drive assembly can be facilitated; in another embodiment of the utility model, the mounting plate 100 is provided with a stopper 150 protruding on the side facing the reducer 300, and the stopper 150 cooperates with the outer shell 310 to limit the outer shell 310 in the radial direction of the mounting plate 100. The stopper 150 can be a step structure arranged around the through hole 110, and the stopper 150 can cooperate with the inner wall and end face of the outer shell 310 during assembly to limit the shaking of the outer shell 310 relative to the mounting plate 100 in the radial direction, which is conducive to further improving the working reliability of the electric drive assembly.
[0046] The utility model also proposes a power device, which includes a device body and an electric drive assembly arranged on the device body. The specific structure of the electric drive assembly refers to the above-mentioned embodiment. Since the power device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.
[0047] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. An electric drive assembly, characterized in that: include: Mounting plate; The motor comprises a housing and a driving shaft arranged on the housing, wherein the housing is fixed on the mounting plate; A reducer, comprising a housing and an input shaft arranged on the housing, wherein the housing is fixed to the mounting plate, and the input shaft is coaxially connected to the driving shaft; A support member, at least one of the input shaft and the drive shaft is rotatably connected to the mounting plate through the support member to support the input shaft and the drive shaft.
2. The electric drive assembly according to claim 1, characterized in that: The mounting plate has a through hole, the housing is fixed on one side end surface of the through hole, the outer shell is fixed on the other side end surface of the through hole, the input shaft extends into the through hole and is connected to the drive shaft, and the support member is arranged in the through hole and is rotatably connected to the input shaft.
3. The electric drive assembly according to claim 2, characterized in that: The support member is configured as a bearing, and the input shaft is rollingly connected to the through hole through the bearing.
4. The electric drive assembly according to claim 3, characterized in that: A support body is protruded from the inner wall of the through hole. The support body extends around the center of the through hole. The support body abuts against the side wall of the bearing to limit the bearing.
5. The electric drive assembly according to claim 4, characterized in that: A shaft shoulder is convexly provided on the outer peripheral wall of the input shaft, and the shaft shoulder cooperates with the support body to clamp the bearing.
6. The electric drive assembly according to claim 5, characterized in that: The electric drive assembly further includes an elastic member, which is disposed on a side of the support body facing the bearing, and the elastic member elastically abuts against the bearing.
7. The electric drive assembly according to claim 6, characterized in that: The elastic member is configured as a wave spring.
8. The electric drive assembly according to claim 2, characterized in that: The mounting plate is provided with a first sealing groove on one end surface facing the casing, and a second sealing groove is provided on one end surface facing the outer shell. The first sealing groove and the second sealing groove are both arranged around the through hole. The first sealing groove is used for embedding a sealing ring to seal the casing and the mounting plate, and the second sealing groove is used for embedding a sealing ring to seal the outer shell and the mounting plate.
9. The electric drive assembly according to claim 1, characterized in that: At least one of the casing and the outer shell is screwed and fixed to the mounting plate; and / or, the mounting plate is provided with a limiting portion protruding toward the side of the reducer, and the limiting portion cooperates with the outer shell to limit the radial position of the outer shell on the mounting plate.
10. A power device, characterized in that: An electric drive assembly comprising any one of claims 1 to 9.