Leading-out structure and motor

Abstract

The utility model relates to the technical field of oil cooling brushless motors, in particular to a leading-out structure and a motor, the leading-out structure comprises an insertion piece fixing seat and a sealing gasket, a wiring insertion piece is integrally formed on the insertion piece fixing seat, the wiring insertion piece is provided with an electric connection inner end extending into the motor and an electric connection outer end extending out of the motor, and the sealing gasket is arranged on the inner end of the wiring insertion piece. The electric connection inner end is used for being electrically connected with a motor lead; and the insertion sheet fixing seat is arranged on the motor shell and is sealed through the sealing gasket. The lead-out structure provided by the utility model is stable in structure, good in sealing effect, and very convenient to install and operate, and by adopting the lead-out structure, the working stability of the motor can be improved, and the service life of the motor can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of oil-cooled brushless motor technology, specifically to a lead-out structure and a motor. Background Technology

[0002] Traditional asynchronous motors are generally large in size and have limitations in control; traditional brushed series motors require frequent maintenance and have a short lifespan. In contrast, brushless motors, with their advantages of high efficiency, long lifespan, and ease of precise control, are gradually becoming the preferred power solution in fields such as power tools.

[0003] However, early brushless motors mostly used air-cooled designs. To ensure effective heat dissipation, these motors generally operated at higher speeds, resulting in significant noise. Furthermore, when used in medium-speed, heavy-duty tools, a reduction gear was required, increasing their size. To overcome the limitations of air-cooled brushless motors, oil-cooled brushless motors were developed. Oil-cooled brushless motors can operate stably at medium speeds, offer excellent cooling, and can directly drive loads without a reduction gear, reducing size and noise.

[0004] Oil-cooled brushless motors are filled with liquid cooling oil, requiring a tight seal to prevent oil leakage and the intrusion of external contaminants, especially at the stator lead exit points, where leakage is possible. Current technology typically involves an opening in the end cover for the lead to exit, which is then sealed with adhesive. However, adhesive sealing is unreliable and cumbersome, and under conditions of high temperature, high pressure, and vibration, oil leakage is prone to occur, thus affecting the motor's normal operation and lifespan. Utility Model Content

[0005] This invention addresses the technical problem of poor sealing in the lead wire lead-out structure of existing oil-cooled brushless motors by proposing a lead-out structure and motor that is structurally stable, has a good sealing effect, and is very convenient to install and operate. Using this lead-out structure can improve the working stability and service life of the motor.

[0006] The technical solution of this utility model:

[0007] A lead-out structure includes a plug holder and a sealing gasket. The plug holder is integrally formed with a wiring plug. The wiring plug has an inner electrical connection end that extends into the motor and an outer electrical connection end that extends out of the motor. The inner electrical connection end is used for electrical connection with the motor lead. The plug holder is mounted on the motor housing and sealed by the sealing gasket.

[0008] Furthermore, the insert fixing seat is installed on the end cover of the motor housing, and multiple wiring inserts are integrally formed on the insert fixing seat; the multiple wiring inserts are spaced apart in a circumferential direction with the motor axis as the center; the insert fixing seat is in the shape of a fan ring with the motor axis as the center.

[0009] Furthermore, the end cap has a communication port through which a connector insert passes, the inner wall of the communication port has a radial protrusion, the sealing gasket includes a clamping section located outside the radial protrusion, the insert fixing seat has a clamping protrusion that can extend into the communication port to correspondingly clamp the clamping section; the sealing gasket also includes an isolation section located on the inner wall of the radial protrusion.

[0010] Furthermore, a blocking protrusion is formed on the inner side of the end cap to block the motor lead wire; the motor lead wire is the lead wire of the motor stator.

[0011] In another aspect, this utility model provides an electric motor, including the lead-out structure as described in any one of the above.

[0012] Furthermore, the motor housing includes a front cover, a middle housing, and a rear cover, with the lead-out structure provided on the rear cover; a first clamping protrusion is formed on the front cover, and a second clamping protrusion is formed on the rear cover, with the first and second clamping protrusions extending into the middle housing to press the two ends of the stator; the inner wall of the middle housing is also provided with a first clearance groove and a second clearance groove corresponding to the first and second clamping protrusions.

[0013] Furthermore, the inner wall of the intermediate housing is provided with a positioning strip parallel to the axial direction of the motor, and the outer wall of the stator is provided with a corresponding positioning groove.

[0014] Furthermore, both the first and second tightening protrusions are annular. Two sealing rings are provided between the outer wall of the first tightening protrusion and the intermediate housing along the motor axial direction. Two sealing rings are also provided between the outer wall of the second tightening protrusion and the intermediate housing along the motor axial direction. A first bearing is provided on the front end cover, and a second bearing is provided on the rear end cover. The output shaft of the rotor is connected to the center of the first and second bearings. Rubber rings are provided on the outer walls of the first and second bearings respectively. A wave washer is also axially pressed between the second bearing and the rear end cover. A skeleton oil seal is also provided between the output shaft of the rotor and the front end cover.

[0015] Furthermore, an oil cup is also sealed and installed on the rear end cover; an oil filling hole is also provided on the rear end cover; the motor is an oil-cooled brushless motor; and a grounding device is also provided on the motor housing.

[0016] Furthermore, a flange is also connected to the front end cover, and an mounting plate is formed on the outer wall of the intermediate housing.

[0017] After adopting the above technical solution, the lead-out structure and motor provided by this utility model have the following beneficial effects compared with the prior art: This utility model can realize the electrical connection between the internal lead of the motor and the external by integrally forming the wiring plug on the plug fixing seat, without the need to apply glue; moreover, the plug fixing seat can be installed by screws, and after installation, the plug fixing seat and the motor housing are pressed and sealed by a sealing gasket, which is convenient to operate and has a good sealing effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the lead-out structure of this utility model from a first-view perspective;

[0019] Figure 2 This is a schematic diagram of the lead-out structure of this utility model from a second perspective;

[0020] Figure 3 This is a structural schematic diagram of the rear end cover of this utility model from a first-view perspective;

[0021] Figure 4 This is a structural schematic diagram of the rear end cover of this utility model from a second perspective;

[0022] Figure 5 This is a cross-sectional view of the rear end cover of this utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the intermediate housing of this utility model;

[0024] Figure 7 This is a schematic diagram of the front cover of this utility model;

[0025] Figure 8 This is a schematic diagram of the motor of this utility model from a first-view perspective;

[0026] Figure 9 This is a structural schematic diagram of the motor of this utility model from a second perspective;

[0027] Figure 10 This is a cross-sectional view of the motor of this utility model.

[0028] in,

[0029] Insert fixing seat 1, wiring insert 11, electrical connection inner end 111, electrical connection outer end 112, clamping protrusion 12; sealing gasket 2, clamping section 21, isolation section 22; motor lead 3; stator 4; rotor 5; front end cover 6, first clamping protrusion 61, first bearing 62, skeleton oil seal 63, flange 64, mounting hole 641, positioning hole 642, grounding device 65; intermediate housing 7, first clearance groove 71, second clearance groove 72, positioning strip 73, mounting plate 74; rear end cover 8, connecting port 81, radial protrusion 82, blocking protrusion 83, second clamping protrusion 84, second bearing 85, wave washer 86, oil cup 87, oil filling hole 88; sealing ring 91, rubber ring 92. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0031] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0032] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0033] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0034] Example 1:

[0035] The purpose of this embodiment is to provide an electrical connection lead-out structure for motor leads. Compared with the traditional method of directly leading the leads out from the end cover and sealing them with glue, the structure is more stable and has a better sealing effect.

[0036] Specifically, such as Figure 1-5 As shown, the lead-out structure includes a plug fixing seat 1 and a sealing gasket 2. The plug fixing seat 1 is preferably made of insulating plastic, and a plurality of wiring plugs 11 are integrally formed thereon. Each wiring plug 11 penetrates the plug fixing seat 1 and has an inner electrical connection end 111 extending into the motor and an outer electrical connection end 112 extending out of the motor. The inner electrical connection end 111 is used for electrical connection with the motor lead 3, for example, with the lead of the stator 4 of a brushless motor. Specifically, the lead can be threaded through the hole on the wiring plug 11 and welded securely. Heat shrink tubing can be wrapped around the weld to isolate bare electricity. Alternatively, it can be connected to the wiring plug 11 using an anti-loosening spring, which is easy to install, and heat shrink tubing can be used after installation to isolate bare electricity. The outer electrical connection end 112 is used for electrical connection with an external power supply or drive module to control the motor operation. The sealing gasket 2 is preferably made of rubber. The insert fixing seat 1 is installed on the motor housing, preferably on one of the end covers of the motor, such as the rear end cover 8 shown in the figure, and is sealed by pressing the sealing gasket 2.

[0037] Thus, the lead-out structure provided in this embodiment, compared with the prior art, can realize the electrical connection between the internal lead of the motor and the external by integrally forming the wiring plug 11 on the plug fixing seat 1, without the need to apply glue; the plug fixing seat 1 can be installed by screws, and after installation, the plug fixing seat 1 and the motor housing are pressed and sealed by the sealing gasket 2, which is convenient to operate, has a good sealing effect, and improves the service life of the motor.

[0038] Preferably, the insert fixing base 1 is integrally formed with multiple wiring inserts 11. For example, a three-phase motor has three wiring inserts 11. These wiring inserts 11 are spaced apart in a circumferential direction with the motor axis as the center, and the insert fixing base 1 can be configured in a fan-shaped annulus with the motor axis as the center. This can reduce the extra space occupied by the insert fixing base 1 and the wiring inserts 11, and the structure of the motor can be more compact.

[0039] Preferably, the end cap has a connecting opening 81 through which the connector 11 passes. The inner wall of the connecting opening 81 has a radial protrusion 82, and the connector 11 extends into the motor from the center of the radial protrusion 82. The sealing gasket 2 includes a clamping section 21 located outside the radial protrusion 82. The connector fixing seat 1 has a clamping protrusion 12 that can extend into the connecting opening 81 to correspondingly clamp the clamping section 21. The sealing gasket 2 also includes an isolation section 22 located on the inner wall of the radial protrusion 82. The clamping section 21 and the isolation section 22 allow for positioning, facilitating the installation of the sealing gasket 2. Furthermore, the isolation section 22 also serves to insulate and isolate the connector 11 from the rear end cap 8. In addition, when the sealing gasket 2 is clamped, it contacts both the inner and outer walls of the radial protrusion 82, and also contacts the inner wall of the connecting opening 81, forming a stepped blocking structure to improve the sealing effect.

[0040] Preferably, the motor lead 3 is the lead of the motor stator 4, and the insert fixing seat 1 and the sealing gasket 2 are set at the position corresponding to the stator 4; and a blocking protrusion 83 is formed on the inner side of the end cover. The blocking protrusion 83 is preferably aligned with the inner ring of the stator 4 frame, which can prevent the bent lead from entering the vicinity of the rotor 5 and ensure the normal and stable operation of the motor.

[0041] As can be seen from the above, the lead-out structure provided in this embodiment is stable, has a good sealing effect, and is very convenient to install and operate. Using this lead-out structure can improve the working stability and service life of the motor.

[0042] Example 2:

[0043] The purpose of this embodiment is to provide a motor, particularly an oil-cooled brushless motor, which employs a lead-out structure as described in Embodiment 1. Specifically, as... Figure 6-10 As shown, the motor housing in this embodiment includes a front cover 6, a middle housing 7, and a rear cover 8, which are connected by screws. The aforementioned lead-out structure is provided on the rear cover 8 at the position corresponding to the stator 4.

[0044] Furthermore, a first pressing protrusion 61 is formed on the front end cover 6 facing the stator 4, and a second pressing protrusion 84 is formed on the rear end cover 8 facing the stator 4. When the front end cover 6, the intermediate housing 7 and the rear end cover 8 are connected, the first pressing protrusion 61 and the second pressing protrusion 84 respectively extend into the intermediate housing 7 to press the two ends of the stator 4 to prevent the stator 4 from running off-center. The installation is simple and the structure is stable.

[0045] Preferably, in this embodiment, a first clearance groove 71 and a second clearance groove 72 are respectively provided on the inner wall of the intermediate housing 7 corresponding to the first tightening protrusion 61 and the second tightening protrusion 84. Since the first tightening protrusion 61 and the second tightening protrusion 84 need to avoid the coil and frame of the stator 4, they can only tighten on the two ends of the stator 4 core. Therefore, in order to improve the strength of the first tightening protrusion 61 and the second tightening protrusion 84, their radial dimensions need to be increased, and the first clearance groove 71 and the second clearance groove 72 are adapted accordingly.

[0046] In addition, this embodiment also provides a positioning strip 73 parallel to the axial direction of the motor on the inner wall of the intermediate housing 7, and a corresponding positioning groove on the outer wall of the stator 4. This facilitates the installation and positioning of the stator 4. After the stator 4 is installed, its lead wire can be aligned with the aforementioned insert fixing seat 1 and wiring insert 11, and the lead wire is located in the radial outer space of the blocking protrusion 83.

[0047] Preferably, both the first tightening protrusion 61 and the second tightening protrusion 84 are annular. Two sealing rings 91, preferably O-rings, are provided between the outer wall of the first tightening protrusion 61 and the intermediate housing 7 along the motor axial direction. Two sealing rings 91 are also provided between the outer wall of the second tightening protrusion 84 and the intermediate housing 7 along the motor axial direction, forming a double-stop sealing structure to improve the sealing effect.

[0048] Furthermore, a first bearing 62 is mounted on the front cover 6, and a second bearing 85 is mounted on the rear cover 8. The output shaft of the rotor 5 is centrally connected to the first bearing 62 and the second bearing 85. The extended end of the output shaft can be connected to an external drive shaft via a key or other means. Rubber rings 92, preferably rectangular rings, are also provided on the outer walls of the first bearing 62 and the second bearing 85 to prevent bearing misalignment and slippage. A wave-shaped washer 86 is axially pressed between the second bearing 85 and the rear cover 8. A skeleton oil seal 63 is also provided between the output shaft of the rotor 5 and the front cover 6. This achieves the sealing of the entire motor, and a water-cooling or air-cooling structure can be added to provide auxiliary cooling for the internal liquid oil of the motor.

[0049] Preferably, in this embodiment, one or more oil cups 87 are also sealed and installed on the rear end cover 8 on the radially outer side of the motor. The oil cup 87 includes an elastic bladder, which can adapt to terrain changes when the oil inside the motor expands and contracts due to thermal expansion and contraction. An oil filling hole 88 is also provided on the rear end cover 8, and the oil filling hole 88 is sealed by screws and O-rings.

[0050] The motor housing is also provided with a grounding device 65. Optionally, the grounding device 65 is provided on the rear end cover 8 and includes a grounding plate and a grounding lead. The grounding plate is pressed and fixed by the mounting screws of the rear end cover 8.

[0051] In addition, a flange 64 is connected to the front cover 6 in this embodiment. The flange 64 is provided with mounting holes 641 and positioning holes 642. The motor can be positioned and installed with the target equipment through the flange 64. A mounting plate 74 is also formed on the outer wall of the intermediate housing 7, or the motor can also be installed with the target equipment through the mounting plate 74.

[0052] As can be seen from the above, the motor provided in this embodiment adopts the lead-out structure described in Embodiment 1, which has a good sealing effect. In addition, it also has the characteristics of convenient installation, stable structure, quiet operation, and small size, making it suitable for the power tool industry and taking into account the requirements of space and noise.

[0053] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An extraction structure, characterized by, The application relates to a lead-out structure of a motor, which comprises a plug fixing base (1) and a sealing gasket (2), the plug fixing base (1) is integrally provided with a wiring plug (11), the wiring plug (11) has an electric connection inner end (111) extending into the interior of the motor and an electric connection outer end (112) extending out of the motor, the electric connection inner end (111) is used for electrically connecting with a motor lead wire (3); the plug fixing base (1) is installed on the motor shell and is sealed through the sealing gasket (2).

2. The lead-out structure according to claim 1, wherein The plug fixing base (1) is installed on an end cover of the motor shell, the plug fixing base (1) is integrally provided with a plurality of wiring plugs (11); the plurality of wiring plugs (11) are arranged in the circumferential direction and take the motor axis as the center; the plug fixing base (1) is a fan ring shape taking the motor axis as the center.

3. The lead-out structure according to claim 2, wherein A communication port (81) through which the wiring plug (11) passes is formed on the end cover, the inner wall of the communication port (81) is formed with a radial flange (82), the sealing gasket (2) comprises a pressing section (21) located outside the radial flange (82), the plug fixing base (1) has a pressing protrusion (12) capable of extending into the communication port (81) and pressing the pressing section (21); the sealing gasket (2) further comprises an isolation section (22) located on the inner wall of the radial flange (82).

4. The lead-out structure according to claim 2 or 3, characterized by The inner side of the end cover is further formed with a blocking protrusion (83) for blocking the motor lead wire (3); the motor lead wire (3) is a lead wire of a motor stator (4).

5. An electric machine characterized by The application further relates to a motor comprising the lead-out structure as claimed in any one of claims 1-4.

6. The electric machine of claim 5, wherein, The motor shell comprises a front end cover (6), an intermediate shell (7) and a rear end cover (8), the rear end cover (8) is provided with the lead-out structure; the front end cover (6) is formed with a first pressing protrusion (61), the rear end cover (8) is formed with a second pressing protrusion (84), the first pressing protrusion (61) and the second pressing protrusion (84) respectively extend into the intermediate shell (7) and press the two end edges of the stator (4); the inner wall of the intermediate shell (7) is further provided with a first avoiding groove (71) and a second avoiding groove (72) corresponding to the first pressing protrusion (61) and the second pressing protrusion (84).

7. The electric machine of claim 6, wherein, The inner wall of the intermediate shell (7) is further provided with a positioning strip (73) parallel to the motor axial direction, and the outer wall of the stator (4) is correspondingly provided with a positioning groove.

8. The electric machine of claim 6, wherein, The first and second top tight protrusions (61, 84) are annular, two sealing rings (91) are arranged between the outer wall of the first top tight protrusion (61) and the middle machine shell (7) along the motor axial direction, two sealing rings (91) are arranged between the outer wall of the second top tight protrusion (84) and the middle machine shell (7) along the motor axial direction; the front end cover (6) is provided with a first bearing (62), the rear end cover (8) is provided with a second bearing (85), the centers of the first bearing (62) and the second bearing (85) are connected with the output shaft of the rotor (5), the outer walls of the first bearing (62) and the second bearing (85) are respectively provided with rubber rings (92), the second bearing (85) and the rear end cover (8) are further axially pressed with a wave washer (86); the output shaft of the rotor (5) and the front end cover (6) are further provided with a skeleton oil seal (63).

9. The electric machine of claim 6, wherein, The rear end cover (8) is further sealed and installed with an oil cup (87); the rear end cover (8) is further provided with an oil injection hole (88); the motor is an oil-cooled brushless motor; the motor shell is further provided with a grounding device (65).

10. The electric machine of claim 6, wherein, The front end cover (6) is further connected with a flange plate (64), and the outer wall of the middle machine shell (7) is further formed with a mounting plate (74).

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