Oil-cooled motor

Abstract

The utility model relates to the technical field of motors, in particular to an oil-cooled motor, liquid oil is filled in the oil-cooled motor in a sealing manner, the oil-cooled motor comprises an end cover positioned at one end of the oil-cooled motor, an output shaft is mounted and connected to the center of the end cover, an oil cup is mounted on the radial outer side of the output shaft on the end cover in a sealing manner, and the oil cup is connected with the output shaft. The oil cup comprises an elastic bag body, and the elastic bag body can elastically deform in a self-adaptive mode along with thermal expansion and cold contraction of liquid oil in the oil cooling motor. The oil-cooled motor provided by the utility model can adaptively adjust the oil pressure in the motor, and has the characteristics of convenience in installation, good sealing effect, silence, small size and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, concretely relates to an oil cooling motor. BACKGROUND

[0002] Compared with traditional asynchronous motor and brush series excited motor, the brushless motor has small size, high efficiency, long service life and is easy to realize precise control, and is used more and more in the field of electric tools.

[0003] Early brushless motor is mostly air-cooled brushless motor, the rotating speed of this kind of motor is generally designed to be higher to ensure good heat dissipation effect, but its noise is larger, and a speed reduction mechanism needs to be additionally installed to adapt to the use demand of medium rotating speed. The internal sealing of oil-cooled brushless motor is filled with liquid oil, and the cooling effect is better, and the motor can stably run at medium rotating speed with small noise, and the cooling can be assisted by additionally installing a fan or setting a water channel on the shell.

[0004] However, the liquid oil in the internal sealing of the oil-cooled brushless motor may expand and contract to a large extent before and after work, and then lead to the sealing failure of the motor shell, resulting in the problems of oil leakage and the entry of external impurities into the internal sealing of the motor. TECHNICAL SOLUTION

[0005] The utility model discloses to solve the technical problem that the thermal expansion and contraction of the liquid oil in the internal sealing of the oil-cooled brushless motor in the prior art may lead to sealing failure, and proposes an oil-cooled motor, which can self-adaptively adjust the oil pressure in the internal sealing of the motor, and has the advantages of compact structure, convenient installation, good sealing effect and the like.

[0006] The technical scheme of the utility model:

[0007] An oil-cooled motor, the internal sealing of which is filled with liquid oil, comprises an end cover at one end thereof, the center of the end cover is connected with an output shaft, an oil cup is sealingly installed on the end cover at the radial outer side of the output shaft, the oil cup comprises an elastic capsule, and the elastic capsule can self-adaptively elastically deform with the thermal expansion and contraction of the liquid oil in the internal sealing of the oil-cooled motor.

[0008] Further, a plurality of oil cups are installed on the end cover, and the plurality of oil cups are arranged in a circumferential interval with the motor axis as the center.

[0009] Further, the capsule body of the elastic capsule is arranged in the oil-cooled motor, the opening of the elastic capsule faces the axial outer side of the end cover, and the edge of the elastic capsule is sealingly pressed against the end cover.

[0010] Further, a plurality of sealing steps are formed between the edge inner side of the elastic capsule and the end cover.

[0011] Further, the opening side of the elastic bag body is provided with an inner supporting sleeve, the inner supporting sleeve has a pressing edge for pressing the edge of the elastic bag body, and the middle part of the inner supporting sleeve is provided with a through hole.

[0012] Further, the oil-cooled motor comprises a first end cover, an intermediate shell and a second end cover, the oil cup is arranged on the first end cover, the first end cover is provided with a first annular protrusion, the second end cover is provided with a second annular protrusion, the first annular protrusion and the second annular protrusion extend into the edges of the two ends of the stator from the two ends of the intermediate shell, and the inner side wall of the intermediate shell is further provided with a first groove and a second groove corresponding to the first annular protrusion and the second annular protrusion.

[0013] Two sealing rings are arranged between the outer side wall of the first annular protrusion and the inner side wall of the intermediate shell in the axial direction of the motor, two sealing rings are arranged between the outer side wall of the second annular protrusion and the inner side wall of the intermediate shell in the axial direction of the motor, the axial inner side of the first end cover is provided with a first bearing, the axial inner side of the second end cover is provided with a second bearing, the centers of the first bearing and the second bearing are connected with the output shaft, the outer side walls of the first bearing and the second bearing are respectively provided with rubber rings, the first bearing is further axially pressed with a wave-shaped gasket between the first bearing and the first end cover, and the output shaft is further provided with a skeleton oil seal between the output shaft and the second end cover.

[0014] Further, the first end cover is further provided with a plug seat on the radial outer side of the output shaft, one or more wiring plugs are integrally formed on the plug seat, each of the wiring plugs has an electrical connection inner end extending into the inside of the oil-cooled motor and an electrical connection outer end extending out of the outside of the oil-cooled motor, the electrical connection inner end is used for electrical connection with the stator lead, and the plug seat is sealed by pressing the sealing gasket.

[0015] When the plug seat has a plurality of wiring plugs, the plurality of wiring plugs are arranged in the circumferential direction with the motor axis as the center, and the plug seat has a fan ring shape with the motor axis as the center.

[0016] Further, the first end cover is further provided with a through opening for the wiring plug to pass through, the inner side wall of the through opening is formed with a radial protruding edge, the sealing gasket comprises a pressing section on the axial outer side of the radial protruding edge, the plug seat has a pressing protrusion capable of extending into the through opening to correspond to the pressing of the pressing section, and the sealing gasket further comprises an isolation section on the inner wall of the radial protruding edge.

[0017] Further, the axial inner side of the first end cover is further formed with a blocking protrusion for blocking the stator lead, the inner side wall of the intermediate shell is further provided with a positioning strip parallel to the axial direction of the motor, and the outer side wall of the stator is correspondingly provided with a positioning groove.

[0018] Further, the oil-cooled motor is a brushless motor, the first end cover is further provided with an oil injection hole, and the first end cover is further provided with a grounding device; the outer side wall of the middle shell is further provided with a mounting bottom plate, and the second end cover is further connected with a mounting flange.

[0019] By adopting the technical scheme, compared with the prior art, the oil-cooled motor has the following beneficial effects: the oil-cooled motor of the utility model, through the oil cup, can adaptively and elastically deform to adjust the internal pressure when the liquid oil in the motor expands when hot and contracts when cold, thereby preventing problems such as oil leakage caused by excessively high internal pressure of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is an overall structure schematic view of the oil-cooled motor of the utility model under a first visual angle.

[0021] Figure 2 It is an overall structure schematic view of the oil-cooled motor of the utility model under a second visual angle.

[0022] Figure 3 It is a sectional view of the oil-cooled motor of the utility model.

[0023] Figure 4 It is a structure exploded schematic view of the oil cup of the utility model.

[0024] Figure 5 It is an overall structure schematic view of the oil cup of the utility model.

[0025] Figure 6 It is a structure schematic view of the insert seat and the sealing gasket of the utility model.

[0026] Figure 7 It is a structure schematic view of the first end cover of the utility model under a first visual angle.

[0027] Figure 8 It is a structure schematic view of the first end cover of the utility model under a second visual angle.

[0028] Figure 9 It is a sectional view of the first end cover of the utility model along the center of the oil cup in a vertical direction.

[0029] Figure 10 It is a sectional view of the first end cover of the utility model along the center of the insert seat in a vertical direction.

[0030] Figure 11 It is a structure schematic view of the middle shell of the utility model.

[0031] Figure 12 It is a structure schematic view of the second end cover of the utility model.

[0032] wherein,

[0033] Oil cup 1, elastic bag body 11, sealing step 111, inner support sleeve 12, pressing edge 121, through hole 122, pressing plate 13;First end cover 2, first annular protrusion 21, first bearing 22, wave washer 23, insert seat 24, pressing protrusion 241, wiring insert 25, electrical connection inner end 251, electrical connection outer end 252, sealing gasket 26, pressing section 261, isolation section 262, overpass 27, radial convex edge 271, blocking protrusion 28, oil injection hole 29;Intermediate shell 3, first groove 31, second groove 32, positioning strip 33, mounting bottom plate 34;Second end cover 4, second annular protrusion 41, second bearing 42, skeleton oil seal 43, mounting flange 44;Stator 5, stator lead 51;Rotor 6, output shaft 61;Sealing ring 71, rubber ring 72;Grounding device 8. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0035] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0036] In addition, it should be noted that the use of the terms "first", "second" and the like to qualify parts is only for the convenience of distinguishing the corresponding parts, and the above terms have no special meaning unless otherwise stated, so it cannot be understood as a limitation on the scope of protection of the utility model.

[0037] As Figures 1-5 shown, the present embodiment provides an oil-cooled motor, especially an oil-cooled brushless motor, the oil-cooled motor is sealed and filled with liquid oil, the liquid oil can cool the stator, rotor and other components in the motor, and a cooling water channel can be arranged on the motor shell to realize external auxiliary water cooling, or a fan is arranged to realize external auxiliary air cooling, so as to realize better cooling effect.

[0038] Furthermore, one end of the oil-cooled motor has an end cap, shown in the figure as the first end cap 2. An output shaft 61 is installed and connected to the axial inner side of the center position of the end cap. The outer end of the output shaft 61 can be provided with a flat key or the like to connect to an external transmission shaft. At least one oil cup 1 is sealed and installed on the end cap on the radial outer side of the output shaft 61. The oil cup 1 includes an elastic bladder 11. The elastic bladder 11 can adaptively deform elastically with the thermal expansion and contraction of the liquid oil inside the oil-cooled motor. When the internal temperature of the motor rises, the liquid oil expands, and the elastic bladder 11 deforms to adjust the internal pressure of the motor. When the internal temperature of the motor drops, the elastic bladder 11 can elastically return to its original position.

[0039] Thus, the oil-cooled motor provided in this embodiment, by setting the oil cup 1, can adaptively and elastically deform to regulate the internal pressure when the liquid oil inside the motor expands and contracts with temperature changes, thereby preventing problems such as oil leakage due to excessive internal pressure. Furthermore, this embodiment sets the oil cup 1 on the radially outer side of the end cap, utilizing the space on the radially outer side of the end cap, making the overall structure more compact and smaller.

[0040] Preferably, the end cap is equipped with multiple oil cups 1, which are arranged circumferentially around the motor axis. This arrangement of multiple relatively small oil cups 1 on the radially outer side of the end cap increases the overall volume variation of the oil cups 1 while maintaining a compact structure, thus enabling better pressure regulation.

[0041] like Figures 4-9 As shown, the elastic bladder 11 is preferably made of rubber, has an opening, and has a roughly U-shaped cross-section. The body of the elastic bladder 11 is placed inside the oil-cooled motor, that is, its non-open side faces the motor end cover and is installed inward and placed inside the motor, while its opening faces the axially outward side of the end cover. The edge of the elastic bladder 11 is sealed and pressed tightly against the end cover. This placement of the elastic bladder 11 inside the motor results in a more aesthetically pleasing design; it also makes full use of the internal space of the motor, reducing the additional space occupied by the external space; furthermore, when the liquid oil inside the motor expands, the elastic bladder 11 is compressed rather than expanded, making it easier to achieve volume change, and the material requirements for the elastic bladder 11 are relatively lower, and the elastic bladder 11 is less prone to rupture.

[0042] Preferably, such as Figure 9 As shown, when the elastic bladder 11 is compressed, its inner edge and the end cap form multiple annular sealing steps 111. The liquid oil inside the motor needs to pass through the inner wall and axial outer side of these sealing steps 111 before leakage occurs, which reduces the possibility of liquid oil leakage and improves the sealing performance.

[0043] In addition, to ensure better compression of the elastic bladder 11 and facilitate better repositioning of the elastic bladder 11, this embodiment also provides an inner support sleeve 12 on the opening side of the elastic bladder 11. The inner support sleeve 12 extends into the elastic bladder 11 to support a part of the elastic bladder 11, facilitating the repositioning of the elastic bladder 11. The inner support sleeve 12 also has a pressing edge 121 for pressing the edge of the elastic bladder 11. A pressure plate 13 is also provided on the axial outer side of the inner support sleeve 12. The pressure plate 13 is fixed to the end cap by screws and indirectly compresses the elastic bladder 11 through the inner support sleeve 12. The middle part of the inner support sleeve 12 is also provided with a through hole 122 to allow air circulation, thereby facilitating the deformation and repositioning of the elastic bladder 11.

[0044] like Figures 1-12 As shown, the oil-cooled motor in this embodiment includes a first end cover 2, an intermediate housing 3, and a second end cover 4, which are connected and fixed by screws; the aforementioned oil cup 1 is provided on the first end cover 2.

[0045] Furthermore, a first annular protrusion 21 is provided on the first end cover 2 facing inwards towards the motor, and a second annular protrusion 41 is provided on the second end cover 4 facing inwards towards the motor. The first annular protrusion 21 and the second annular protrusion 41 extend from both ends of the intermediate housing 3 and press against the edges of both ends of the stator 5 core. The stator 5 is fixed by this pressing method, which facilitates assembly. Preferably, since the first annular protrusion 21 and the second annular protrusion 41 need to avoid the coils and frame at both ends of the stator 5 and only press against the edges of the stator 5 core, their wall thickness can be increased to ensure the strength of the first annular protrusion 21 and the second annular protrusion 41. At the same time, a first groove 31 and a second groove 32 are respectively provided on the inner side wall of the intermediate housing 3 to avoid the first annular protrusion 21 and the second annular protrusion 41.

[0046] Furthermore, in this embodiment, two sealing rings 71 are provided along the motor axial direction between the outer wall of the first annular protrusion 21 and the inner wall of the intermediate housing 3, and two sealing rings 71 are also provided along the motor axial direction between the outer wall of the second annular protrusion 41 and the inner wall of the intermediate housing 3. The sealing rings 71 are preferably O-rings, forming a double-stop sealing structure, which provides better sealing effect. A first bearing 22 is provided on the axial inner side of the first end cover 2, and a second bearing 42 is provided on the axial inner side of the second end cover 4. The output shaft 61 is centrally connected to the first bearing 22 and the second bearing 42. The output shaft 61 is mounted on the rotor 6. Rubber rings 72, preferably rectangular rings, are provided on the outer walls of the first bearing 22 and the second bearing 42, respectively, to provide shock absorption and anti-slip function. A wave washer 23 is also axially pressed between the first bearing 22 and the first end cover 2. A skeleton oil seal 43 is also provided between the output shaft 61 and the second end cover 4.

[0047] In addition, in order to ensure the sealing effect of the stator lead 51 when it is drawn out, the first end cover 2 is further provided with a tab seat 24 corresponding to the position of the stator 5 on the radial outside of the output shaft 61. The tab seat 24 is preferably made of plastic, and one or more tab terminals 25 are integrally formed on the tab seat 24. Each tab terminal 25 has an electrical connection inner end 251 extending into the inside of the oil-cooled motor and an electrical connection outer end 252 extending out of the oil-cooled motor. The electrical connection inner end 251 is used to realize electrical connection with the stator lead 51 through welding or plug-in terminals, and after electrical connection, a heat shrink tube can be wrapped around to isolate the bare wires. The electrical connection outer end 252 is used to realize electrical connection with an external power supply and a driving module to realize power supply and control of the motor. The first end cover 2 is further provided with a sealing gasket 26. The tab seat 24 and the sealing gasket 26 need to avoid the oil cup 1 described above. The tab seat 24 is installed on the first end cover 2 by screws and is sealed by pressing the sealing gasket 26, without the need for glue, and is easy to install. In this way, the entire motor is sealed to prevent internal oil leakage and external impurities from entering.

[0048] Preferably, when the tab terminals 25 on the tab seat 24 are multiple, for example, three, the three tab terminals 25 are arranged in a circumferential direction with the motor axis as the center, and the tab seat 24 is in the form of a fan ring with the motor axis as the center, reasonably utilizing the space, and the motor size can be more compact.

[0049] Further, the first end cover 2 is further formed with a through opening 27 through which the tab terminal 25 passes. The inner side wall of the through opening 27 is formed with a radial flange 271 through the center of which the tab terminal 25 extends into the motor. The sealing gasket 26 includes a pressing section 261 on the axial outside of the radial flange 271. The tab seat 24 has a pressing protrusion 241 that can extend into the through opening 27 and correspond to the pressing section 261. The sealing gasket 26 further includes an isolation section 262 on the inner wall of the radial flange 271. The pressing section 261 and the isolation section 262 can be positioned to facilitate the installation of the sealing gasket 26, and the isolation section 262 can insulate and separate the tab terminal 25 and the first end cover 2. In addition, a stepped sealing structure is formed between the sealing gasket 26 and the radial flange 271 after installation, and the sealing effect is better.

[0050] As shown in Figures 8-10 The first end cover 2 is further formed with a blocking protrusion 28 on the axial inside to block the stator lead 51. The blocking protrusion 28 is arranged in alignment with the inner ring of the skeleton of the stator 5 to prevent the stator lead 51 from running to the vicinity of the rotor 6. Preferably, as shown in Figure 11The inner side wall of the intermediate shell 3 is further provided with a positioning strip 33 parallel to the axial direction of the motor, and the outer side wall of the stator 5 is correspondingly provided with a positioning groove for positioning the stator 5, so that the stator lead 51 can be ensured to be located in the cavity surrounded by the blocking protrusion 28.

[0051] As shown in Figure 1 , 7 , the first end cover 2 is further provided with an oil injection hole 29, which is sealed by a screw and an O-ring. As shown in Figures 1-2 , the outer side wall of the intermediate shell 3 is further provided with a mounting bottom plate 34, and the second end cover 4 is further connected with a mounting flange 44, so that two mounting modes are provided, and the motor can be mounted on a target machine through the mounting bottom plate 34 or the mounting flange 44. As shown in Figure 10 , the first end cover 2 is further provided with a grounding device 8, which can include a grounding sheet and a grounding lead.

[0052] From the above, it can be seen that the oil-cooled motor provided by the embodiment can adaptively adjust the oil pressure in the motor, and has the characteristics of convenient installation, good sealing effect, silence, small size and the like, and is applied to the electric tool industry, and meets the requirements of space and silence.

[0053] The above is only a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. An oil-cooled electric machine characterized by, The oil cooling motor inner seal is filled with liquid oil, the oil cooling motor comprises an end cover at one end, the center of the end cover is provided with an output shaft (61), and an oil cup (1) is sealingly arranged on the end cover and located on the radial outside of the output shaft (61); the oil cup (1) comprises an elastic bag body (11), and the elastic bag body (11) can be elastically deformed adaptively with the thermal expansion and contraction of the liquid oil in the oil cooling motor.

2. The oil-cooled electric machine of claim 1, wherein, A plurality of oil cups (1) are arranged on the end cover; and the plurality of oil cups (1) are arranged in a circumferential interval around the motor axis.

3. The oil-cooled electric machine of claim 1 or 2, wherein, The bag body of the elastic bag body (11) is arranged in the oil cooling motor, the opening of the elastic bag body (11) faces the axial outside of the end cover, and the edge of the elastic bag body (11) is sealingly compressed to the end cover.

4. The oil-cooled electric machine of claim 3, wherein, A plurality of sealing steps (111) are formed between the edge of the elastic bag body (11) and the end cover.

5. The oil-cooled electric machine of claim 3, wherein, An inner supporting sleeve (12) is further arranged on the opening side of the elastic bag body (11), the inner supporting sleeve (12) has a pressing edge (121) for pressing the edge of the elastic bag body (11), and a through hole (122) is further arranged in the middle part of the inner supporting sleeve (12).

6. The oil-cooled electric machine of claim 1, wherein, The oil cooling motor comprises a first end cover (2), an intermediate shell (3) and a second end cover (4), the oil cup (1) is arranged on the first end cover (2), a first annular protrusion (21) is arranged on the first end cover (2), a second annular protrusion (41) is arranged on the second end cover (4), the first annular protrusion (21) and the second annular protrusion (41) extend into the edges of the two ends of the stator (5) from the two ends of the intermediate shell (3), and a first groove (31) and a second groove (32) are further arranged on the inner side wall of the intermediate shell (3) and correspond to the first annular protrusion (21) and the second annular protrusion (41) respectively. Two sealing rings (71) are arranged between the outer side wall of the first annular protrusion (21) and the inner side wall of the intermediate shell (3) along the motor axis, two sealing rings (71) are arranged between the outer side wall of the second annular protrusion (41) and the inner side wall of the intermediate shell (3) along the motor axis, a first bearing (22) is arranged on the axial inner side of the first end cover (2), a second bearing (42) is arranged on the axial inner side of the second end cover (4), the centers of the first bearing (22) and the second bearing (42) are connected with the output shaft (61), the outer side walls of the first bearing (22) and the second bearing (42) are respectively provided with rubber rings (72), a wave-shaped gasket (23) is further arranged axially between the first bearing (22) and the first end cover (2), and a skeleton oil seal (43) is further arranged between the output shaft (61) and the second end cover (4).

7. The oil-cooled electric machine of claim 6, wherein, The first end cover (2) is further provided with a plug seat (24) on the radial outer side of the output shaft (61), and one or more plug pins (25) are integrally formed on the plug seat (24), each of the plug pins (25) has an electrical connection inner end (251) extending into the oil-cooled motor and an electrical connection outer end (252) extending out of the oil-cooled motor, and the electrical connection inner end (251) is used for electrical connection with the stator lead (51); the first end cover (2) is further provided with a sealing gasket (26), and the plug seat (24) is sealed by pressing the sealing gasket (26). When the plug pins (25) on the plug seat (24) are multiple, the multiple plug pins (25) are arranged in the circumferential direction with the motor axis as the center, and the plug seat (24) is a fan ring with the motor axis as the center.

8. The oil-cooled electric machine of claim 7, wherein, The first end cover (2) is formed with a through opening (27) through which the plug pin (25) passes, the inner side wall of the through opening (27) is formed with a radial flange (271), the sealing gasket (26) includes a pressing section (261) located on the axial outer side of the radial flange (271), and the plug seat (24) has a pressing protrusion (241) capable of extending into the through opening (27) to correspondingly press the pressing section (261); the sealing gasket (26) further includes an isolation section (262) located on the inner wall of the radial flange (271).

9. The oil-cooled electric machine of claim 7, wherein, The axial inner side of the first end cover (2) is further formed with a blocking protrusion (28) for blocking the stator lead (51); the inner side wall of the middle shell (3) is further provided with a positioning strip (33) parallel to the axial direction of the motor, and the outer side wall of the stator (5) is correspondingly provided with a positioning groove.

10. The oil-cooled electric machine of claim 6, wherein, The oil-cooled motor is a brushless motor, the first end cover (2) is further provided with an oil injection hole (29), and the first end cover (2) is further provided with a grounding device (8); the outer side wall of the middle shell (3) is further provided with a mounting bottom plate (34), and the second end cover (4) is further connected with a mounting flange (44).

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