Integrated motor shell

Abstract

The invention discloses an integrated motor shell which comprises an upper shell, a lower shell, a stator, a rotor and a gear assembly. The lower shell comprises a stator mounting part and a gear mounting part, a first fixing groove is formed in the stator mounting part, the stator is mounted in the first fixing groove, the rotor is arranged in the stator, and the gear assembly is arranged on the gear mounting part; the upper shell is provided with a first clamping groove and a second clamping groove corresponding to the stator mounting part and the gear mounting part, the first clamping groove and the second clamping groove are connected with the stator and the gear assembly respectively, and the upper shell and the lower shell are buckled to form a motor shell. According to the invention, the rotor, the stator and the gear set are installed in the lower shell and then the upper shell and the lower shell are buckled instead of the mode of sequentially assembling internal parts of the motor along the axial direction in the prior art, so that the problem of eccentricity of the rotor is effectively solved, and the integration level of the parts is also improved; the number of parts is reduced, and the connection relation and the matching face between the parts are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and more specifically, to an integrated motor housing. Background Art

[0002] Based on the experience of the electric drive system NVH development project, we sorted out and summarized the root causes of common NVH problems and found that motor rotor eccentricity can cause a series of NVH problems, such as: "speed frequency, sideband, bearing wear, abnormal noise, and severe problems such as bearing fall apart."

[0003] The motor is mainly composed of the front cover, motor housing, stator, rotor, and rear cover, and the reducer is mainly composed of the reducer front housing, gear set, and reducer rear housing. Each component is assembled axially in sequence. Because it is an axial assembly, the front and rear bearings of the rotor and the bearing chambers of the front and rear covers are clearance-fitted, and there is a gap between the outer ring of the bearing and the inner ring of the bearing. Therefore, when the motor is working, there will be relative sliding between the bearing and the bearing chamber in the axial, radial, and circumferential directions. After a long period of operation, the bearing chamber or the bearing will have wear problems, causing the gap between the bearing and the bearing chamber to gradually increase, aggravating the rotor eccentricity problem.

[0004] Therefore, how to provide an integrated motor housing has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0005] An object of the present invention is to provide a new technical solution for an integrated motor housing.

[0006] According to a first aspect of the present invention, there is provided an integrated motor housing, comprising: an upper housing, a lower housing, a stator, a rotor and a gear assembly;

[0007] The lower housing comprises a stator mounting portion and a gear mounting portion, the stator mounting portion is provided with a first fixing groove, the stator is mounted in the first fixing groove, the rotor is arranged in the stator, and the gear assembly is arranged in the gear mounting portion;

[0008] The upper shell is provided with a first snap-in groove and a second snap-in groove corresponding to the stator mounting portion and the gear mounting portion, the first snap-in groove and the second snap-in groove are respectively connected to the stator and the gear assembly, and the upper shell and the lower shell are buckled together to form a motor shell.

[0009] Optionally, the stator mounting portion and the gear mounting portion are integrally formed.

[0010] Optionally, a second fixing groove and a third fixing groove are provided on the gear mounting portion, and the gear assembly is respectively arranged in the second fixing groove and the third fixing groove.

[0011] Optionally, a key slot is provided at the bottom of the first fixing slot, and a positioning key is provided on the outer side wall of the stator, and the positioning key is inserted into the key slot.

[0012] Optionally, there is a first partition plate between the stator mounting portion and the gear mounting portion, a front bearing chamber is arranged on the first partition plate, a rear bearing chamber is also arranged at the first end of the lower shell body, first bearings are arranged at both ends of the rotor, and the first bearings are respectively placed on the front bearing chamber and the rear bearing chamber.

[0013] Optionally, a plurality of gear set bearing chambers are provided at the second end of the lower shell, and the gear assembly includes a gear set and a second bearing, the gear sets are respectively provided in the gear mounting parts, the second bearings are respectively provided in a plurality of the gear set bearing chambers, and the gear set is connected to the second bearings.

[0014] Optionally, the integrated motor housing further includes a bearing shell, which is sleeved on the first bearing, and both ends of the bearing shell are fixedly connected to the lower housing.

[0015] Optionally, first mounting holes are respectively provided at both ends of the front bearing chamber and the rear bearing chamber, and second mounting holes are respectively provided at both ends of the bearing shell, and the bearing shell is fixed to the lower shell by installing fastening bolts on the first mounting holes and the second mounting holes.

[0016] Optionally, a second spacing plate is correspondingly arranged between the first clamping groove and the second clamping groove, a third clamping groove is arranged on the second spacing plate, and the third clamping groove and the front bearing chamber form a first fixing hole.

[0017] Optionally, a fourth snap-in groove and a plurality of fifth snap-in grooves are respectively provided at both ends of the upper shell, the fourth snap-in groove and the rear bearing chamber form a second fixing hole, and the plurality of fifth snap-in grooves and the plurality of gear set bearing chambers respectively form third fixing holes.

[0018] The beneficial effects of the present invention are:

[0019] The present invention installs the stator in the first fixing groove, the rotor is arranged in the stator, and the gear assembly is arranged in the gear mounting part; and the first clamping groove and the second clamping groove corresponding to the stator mounting part and the gear mounting part are arranged on the upper shell, the first clamping groove and the second clamping groove are respectively connected to the stator and the gear assembly, and the upper shell and the lower shell are buckled to form a motor shell. The present invention effectively solves the problem of rotor eccentricity by changing the prior art internal parts of the motor to be assembled axially in sequence to an installation method in which the rotor, stator and gear set are installed in the lower shell, and then the upper shell and the lower shell are buckled, and the integration of parts is improved, the number of parts is reduced, the connection relationship and matching surface between parts are reduced, and the processing area of ​​parts such as the shell and the end cover is reduced, and the processing amount is reduced, which has the advantage of low cost.

[0020] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0022] Figure 1 It is a structural diagram of the integrated motor housing of the present invention;

[0023] Figure 2 is a cross-sectional view of the integrated motor housing of the present invention;

[0024] Figure 3 It is a structural diagram of the lower housing of the present invention;

[0025] Figure 4 It is a structural diagram of the upper shell of the present invention;

[0026] Figure 5 It is an exploded view of the upper shell and the lower shell of the present invention.

[0027] The markings in the figure are as follows: 1. Upper shell; 11. First snap-in slot; 12. Second snap-in slot; 13. Second partition plate; 14. Third snap-in slot; 15. Fourth snap-in slot; 16. Fifth snap-in slot; 2. Lower shell; 21. Stator mounting portion; 211. First fixed slot; 212. Key slot; 22. Gear mounting portion; 221. Second fixed slot; 222. Third fixed slot; 23. First partition plate; 24. Front bearing chamber; 25. Rear bearing chamber; 26. Gear set bearing chamber; 27. First mounting hole; 3. Stator; 31. Positioning key; 4. Rotor; 5. Gear assembly; 51. Gear set; 52. Second bearing; 6. First bearing; 7. Bushing. DETAILED DESCRIPTION

[0028] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0029] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0030] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0031] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0032] like Figures 1 to 5 As shown, an embodiment of the present invention provides an integrated motor housing, including: an upper housing 1, a lower housing 2, a stator 3, a rotor 4 and a gear assembly 5.

[0033] The lower housing 2 includes a stator mounting portion 21 and a gear mounting portion 22 . The stator mounting portion 21 is provided with a first fixing groove 211 . The stator 3 is mounted in the first fixing groove 211 . The rotor 4 is disposed in the stator 3 . The gear assembly 5 is disposed in the gear mounting portion 22 .

[0034] Specifically, the cross-section of the lower housing 2 in the axial direction and the cross-section of the upper housing 1 in the axial direction are both L-shaped structures. The stator mounting portion 21 is arranged on one side of the gear mounting portion 22 so that the gear mounting portion 22 can be connected to the rotor 4, and the first fixing groove 211 is an arc groove to match the structure of the outer peripheral wall of the stator 3.

[0035] The upper shell 1 is provided with a first snap-in groove 11 and a second snap-in groove 12 corresponding to the stator mounting portion 21 and the gear mounting portion 22. The first snap-in groove 11 and the second snap-in groove 12 are respectively connected to the stator 3 and the gear assembly 5. The upper shell 1 and the lower shell 2 are buckled together to form a motor housing.

[0036] Specifically, the first snap-fit ​​groove 11 and the second snap-fit ​​groove 12 are both arc-shaped grooves, and correspond to the stator mounting portion 21 and the gear mounting portion 22 respectively, so that after the upper shell 1 and the lower shell 2 are buckled together, the stator 3, the rotor 4 and the gear assembly 5 can be stably placed inside the upper shell 1 and the lower shell 2.

[0037] Moreover, the diameter and length of the first fixing groove 211 and the first clamping groove 11 can be adjusted based on different sizes of the stator 3. The diameter and length of the second fixing groove 221 and the third fixing groove 222 and the second clamping groove 12 can be adjusted based on different sizes of the stator 3.

[0038] The present invention installs the stator 3 in the first fixing groove 211, the rotor 4 is arranged in the stator 3, and the gear assembly 5 is arranged in the gear mounting portion 22; and the first clamping groove 11 and the second clamping groove 12 corresponding to the stator mounting portion 21 and the gear mounting portion 22 are arranged on the upper shell 1, and the first clamping groove 11 and the second clamping groove 12 are connected to the stator 3 and the gear assembly 5 respectively, and the upper shell 1 and the lower shell 2 are buckled to form a motor housing. The present invention effectively solves the problem of eccentricity of the rotor 4 by changing the prior art internal parts of the motor to be assembled axially in sequence to an installation method in which the rotor 4, the stator 3 and the gear assembly 51 are installed in the lower shell 2, and then the upper shell 1 is buckled with the lower shell 2, and the integration of parts is improved, the number of parts is reduced, the connection relationship and the matching surface between parts are reduced, and the processing area of ​​parts such as the shell and the end cover is reduced, and the processing amount is reduced, which has the advantage of low cost.

[0039] It should be noted that the present invention integrates the front bearing chamber 24 and the rear bearing chamber 25, which originally belonged to the front cover and the rear cover, respectively, into the upper shell 1 and the lower shell 2, so that the length of the dimension chain between the front bearing chamber 24 and the rear bearing chamber 25 is shortened, that is, the number of component rings of the dimension chain is reduced, specifically, the component rings of the radial dimension chain are reduced by 3, and the component rings of the axial dimension chain are reduced by 2. Under the same processing technology level, the shortening of the dimension chain can reduce the error accumulation, that is, improve the assembly accuracy of the rotor 4.

[0040] The present invention reduces the component rings of the radial dimension chain and the axial dimension chain, reduces the assembly error caused by the combined assembly of multiple parts, and has the advantage of high assembly accuracy.

[0041] In one embodiment of the integrated motor housing of the present invention, in order to improve the structural strength of the upper housing 1 and the lower housing 2, the stator mounting portion 21 and the gear mounting portion 22 are integrally formed, and the first clamping groove 11 and the second clamping groove 12 are also integrally formed.

[0042] In one embodiment of the integrated motor housing of the present invention, Figure 3 As shown, the gear mounting portion 22 is provided with a second fixing groove 221 and a third fixing groove 222 , and the gear assembly 5 is respectively disposed in the second fixing groove 221 and the third fixing groove 222 .

[0043] Specifically, the second fixing groove 221 and the third fixing groove 222 are disposed adjacent to each other, so that the plurality of gears on the gear assembly 5 can be stably mounted on the second fixing groove 221 and the third fixing groove 222 .

[0044] In one embodiment of the integrated motor housing of the present invention, Figures 1 to 5 As shown, a key slot 212 is provided at the bottom of the first fixing slot 211 , and a positioning key 31 is provided on the outer side wall of the stator 3 , and the positioning key 31 is inserted into the key slot 212 .

[0045] Specifically, the size, position and number of the positioning keys 31 can be adjusted based on design requirements as long as they have the same function.

[0046] Since the motor rotor 4 rotates during operation, it will generate a reaction force on the stator 3. In order to avoid relative rotation between the stator 3 and the motor housing, a key slot 212 is provided at the bottom of the first fixing slot 211, and a positioning key 31 is provided on the outer wall of the stator 3. The positioning key 31 is inserted into the key slot 212 to prevent the stator 3 from rotating with the motor housing.

[0047] In one embodiment of the integrated motor housing of the present invention, Figures 1 to 5 As shown, there is a first partition plate 23 between the stator mounting portion 21 and the gear mounting portion 22, and a front bearing chamber 24 is arranged on the first partition plate 23. A rear bearing chamber 25 is also arranged at the first end of the lower shell 2. First bearings 6 are sleeved at both ends of the rotor 4, and the first bearings 6 are respectively placed on the front bearing chamber 24 and the rear bearing chamber 25.

[0048] The present invention uses a front bearing chamber 24 to be arranged on the first partition plate 23, a rear bearing chamber 25 to be arranged on the first end of the lower shell 2, and the first bearings 6 sleeved on both ends of the rotor 4 are respectively placed on the front bearing chamber 24 and the rear bearing chamber 25, so as to provide support for the first bearings 6 at both ends of the rotor 4.

[0049] In one embodiment of the integrated motor housing of the present invention, Figures 1 to 5 As shown, a second partition plate 13 is correspondingly arranged between the first clamping groove 11 and the second clamping groove 12 , a third clamping groove 14 is arranged on the second partition plate 13 , and the third clamping groove 14 and the front bearing chamber 24 form a first fixing hole.

[0050] The present invention arranges a second partition plate 13 between the first clamping groove 11 and the second clamping groove 12, and arranges a third clamping groove 14 on the second partition plate 13, so that the third clamping groove 14 and the front bearing chamber 24 form a first fixing hole for installing the first bearing 6, thereby ensuring the stability of the installation of the first bearing 6.

[0051] In one embodiment of the integrated motor housing of the present invention, Figures 1 to 5 As shown, the integrated motor housing further includes a bearing shell 7 , which is sleeved on the first bearing 6 , and both ends of the bearing shell 7 are fixedly connected to the lower housing 2 .

[0052] The interference fit between the inner wall of the bearing shell 7 and the outer wall of the first bearing 6 ensures that there is no gap between the first bearing 6 and the front bearing chamber 24 and the rear bearing chamber 25, shortening the dimension chain between the front and rear bearings of the rotor 4 and further improving the assembly accuracy of the rotor 4.

[0053] In addition, the bearing shell 7 achieves an interference fit with the first bearing 6 to achieve an interference fit with the rotor 4, thereby limiting the sliding of the first bearing 6 in the radial and axial directions. This can solve the problem of bearing ring wear caused by clearance fit between the rotor 4 bearing and the bearing chamber in the traditional motor solution, fundamentally reduce various secondary problems caused by bearing ring wear (abnormal noise, breakage, etc.), and improve product service life and reliability.

[0054] The present invention sleeves the bearing shell 7 on the first bearing 6, and the two ends of the bearing shell 7 are fixedly connected to the lower housing 2, which further limits the first bearing 6, improves the installation stability of the first bearing 6, and further improves the assembly accuracy.

[0055] In one embodiment of the integrated motor housing of the present invention, Figure 3 As shown, first mounting holes 27 are respectively provided at both ends of the front bearing chamber 24 and the rear bearing chamber 25, and second mounting holes are respectively provided at both ends of the bearing shell 7. The bearing shell 7 is fixed to the lower housing 2 by installing fastening bolts on the first mounting holes 27 and the second mounting holes.

[0056] The present invention respectively sets first mounting holes 27 at both ends of the front bearing chamber 24 and the rear bearing chamber 25, and respectively sets second mounting holes at both ends of the bearing shell 7, and installs fastening bolts on the first mounting holes 27 and the second mounting holes to fix the bearing shell 7 on the lower housing 2, thereby ensuring the stability of the bearing shell 7 fixed on the lower housing 2 and further improving the stability of the installation of the first bearing 6.

[0057] In one embodiment of the integrated motor housing of the present invention, Figures 1 to 5 As shown, a plurality of gear set bearing chambers 26 are provided at the second end of the lower shell 2, and the gear assembly 5 includes a gear set 51 and a second bearing 52, the gear sets 51 are respectively arranged in the gear mounting parts 22, and the second bearings 52 are respectively arranged in a plurality of gear set bearing chambers 26, and the gear sets 51 are connected to the second bearings 52.

[0058] Specifically, the sizes and quantities of the plurality of gear set bearing chambers 26 can be adjusted based on different gear set 51 structures.

[0059] The size of the second fixing groove 221 and the third fixing groove 222 can be adjusted based on the external size of the gear set 51 to ensure that the size of the closed cavity formed by the second fixing groove 221 and the third fixing groove 222 and the second clamping groove 12 is larger than the size of the gear set 51.

[0060] The present invention arranges the gear sets 51 in the gear mounting parts 22 , the second bearings 52 in the plurality of gear set bearing chambers 26 , and the gear sets 51 are connected to the second bearings 52 , so that the gear sets 51 can be stably installed in the lower housing 2 .

[0061] It should be noted that the second bearings 52 on both sides of the gear set 51 can also be fixed with the bearing shell 7 to further improve the assembly accuracy of the second bearing 52 in the radial direction to solve the problem of circling wear of the second bearing 52 of the gear set 51.

[0062] In one embodiment of the integrated motor housing of the present invention, Figure 4 As shown, a fourth snap-in slot 15 and a plurality of fifth snap-in slots 16 are respectively provided at both ends of the upper shell 1. The fourth snap-in slot 15 and the rear bearing chamber 25 form a second fixing hole, and the plurality of fifth snap-in slots 16 and the plurality of gear set bearing chambers 26 respectively form a third fixing hole.

[0063] The present invention forms a second fixing hole with the fourth clamping groove 15 and the rear bearing chamber 25, and forms a third fixing hole with the plurality of fifth clamping grooves 16 and the plurality of gear set bearing chambers 26, so that the motor can work stably.

[0064] In addition, since the cooling methods of the gear set 51 and the stator 3 and the rotor 4 are different, the cooling method of the gear set 51 is oil cooling, and the cooling methods of the stator 3 and the rotor 4 are air cooling, liquid cooling (water cooling), and oil cooling. It can be selected based on design requirements whether the first fixed groove 211, the first clamping groove 11 and the second fixed groove 221, the third fixed groove 222 and the second clamping groove 12 are connected.

[0065] When the first fixing groove 211 and the first clamping groove 11 are connected with the second fixing groove 221 , the third fixing groove 222 and the second clamping groove 12 , the stator 3 , the rotor 4 and the gear can share a cooling system, that is, all adopt an oil cooling solution.

[0066] When the first fixing groove 211 and the first clamping groove 11 are isolated from the second fixing groove 221, the third fixing groove 222 and the second clamping groove 12, the following options are available, for example: 1. The outer surfaces of the upper shell 1 and the lower shell 2 are provided with heat dissipation fins or other heat dissipation structures, so that the upper shell 1 and the lower shell 2 can have an air cooling function; 2. The interior of the upper shell 1 and the lower shell 2 is provided with a cooling circuit, through which coolant, water and other similar media pass, so that the upper shell 1 and the lower shell 2 can have a liquid cooling function; 3. The inner surfaces of the upper shell 1 and the lower shell 2 are provided with an oil circuit, through which lubricating oil and other similar media pass, so that the upper shell 1 and the lower shell 2 can have an oil cooling function.

[0067] In summary, the motor housing described in the present invention has the advantages of high integration, high assembly accuracy, low cost, etc., and can improve the working environment of components such as the rotor 4, gears, and bearings, thereby improving the product NVH performance and product reliability.

[0068] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An integrated motor housing, characterized in that: include: Upper housing, lower housing, stator, rotor and gear assembly; The lower housing comprises a stator mounting portion and a gear mounting portion, the stator mounting portion is provided with a first fixing groove, the stator is mounted in the first fixing groove, the rotor is arranged in the stator, and the gear assembly is arranged in the gear mounting portion; The upper shell is provided with a first snap-in groove and a second snap-in groove corresponding to the stator mounting portion and the gear mounting portion, the first snap-in groove and the second snap-in groove are respectively connected to the stator and the gear assembly, and the upper shell and the lower shell are buckled together to form a motor shell.

2. The integrated motor housing according to claim 1, characterized in that: The stator mounting portion and the gear mounting portion are integrally formed.

3. The integrated motor housing according to claim 1, characterized in that: The gear mounting portion is provided with a second fixing groove and a third fixing groove, and the gear assembly is respectively arranged in the second fixing groove and the third fixing groove.

4. The integrated motor housing according to claim 1, characterized in that: A key slot is provided at the bottom of the first fixing slot, and a positioning key is provided on the outer side wall of the stator, and the positioning key is inserted into the key slot.

5. The integrated motor housing according to claim 1, characterized in that: A first partition plate is provided between the stator mounting portion and the gear mounting portion, a front bearing chamber is arranged on the first partition plate, a rear bearing chamber is also provided at the first end of the lower shell, first bearings are provided at both ends of the rotor, and the first bearings are respectively placed on the front bearing chamber and the rear bearing chamber.

6. The integrated motor housing according to claim 5, characterized in that: A plurality of gear set bearing chambers are provided at the second end of the lower shell, and the gear assembly includes a gear set and a second bearing. The gear sets are respectively arranged in the gear mounting parts, and the second bearings are respectively arranged in the plurality of gear set bearing chambers, and the gear set is connected to the second bearings.

7. The integrated motor housing according to claim 5, characterized in that: The integrated motor housing further comprises a bearing shell, which is sleeved on the first bearing, and both ends of the bearing shell are fixedly connected to the lower housing.

8. The integrated motor housing according to claim 7, characterized in that: The front bearing chamber and the rear bearing chamber are respectively provided with first mounting holes at both ends, and the bearing shells are respectively provided with second mounting holes at both ends. The bearing shells are fixed to the lower housing by installing fastening bolts on the first mounting holes and the second mounting holes.

9. The integrated motor housing according to claim 5, characterized in that: A second partition plate is correspondingly arranged between the first clamping groove and the second clamping groove, a third clamping groove is arranged on the second partition plate, and the third clamping groove and the front bearing chamber form a first fixing hole.

10. The integrated motor housing according to claim 6, characterized in that: A fourth snap-in slot and a plurality of fifth snap-in slots are respectively provided at both ends of the upper shell, the fourth snap-in slot and the rear bearing chamber form a second fixing hole, and the plurality of fifth snap-in slots and the plurality of gear set bearing chambers respectively form third fixing holes.

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