An oil-immersed electric motor

Abstract

The application relates to an oil-immersed electric mechanism which comprises a motor, a planetary reducer, an output shaft, a feedback assembly and a control module arranged in a shell assembly, the rear end of the output shaft is connected to a cross-link valve through the shell assembly, the feedback assembly comprises a pin shaft and two micro switches arranged on a mounting plate fixedly arranged in the shell assembly, the micro switches are used for sending switch signals to the control module, the pin shaft is vertically arranged on the mounting plate, the two micro switches are symmetrically arranged on the two sides of the pin shaft, two transmission levers are rotatably arranged on the pin shaft, a spring is arranged between the front ends of the two transmission levers, and the front ends of the two transmission levers are respectively pressed to touch the two micro switches under the pushing of the spring; a touching piece is arranged on the output shaft, and the front end of the corresponding transmission lever of the touching piece can overcome the pressure of the spring and release the micro switch when the output shaft is rotated in the forward direction or the reverse direction. The application has the advantages of small volume, large torque, high stability and long-term work in oil.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of valve control, and particularly relates to an oil-immersed electric mechanism. BACKGROUND

[0002] The cross-linking valve applied to the aircraft fuel system is used for connecting two independent fuel supply tanks, and functions to open the valve to connect the two fuel supply tanks when the oil pump in one of the fuel supply tanks cannot normally supply oil due to failure, so that the fuel in the bad pump tank is fully utilized. Due to the limitation of the special working environment of the aircraft, the performance requirements of small size, large torque and high stability need to be met.

[0003] However, the electric mechanism on the market cannot simultaneously meet the requirements of small size, large output torque and long-term immersion in oil for work. SUMMARY

[0004] Therefore, the purpose of the application is to overcome the deficiencies of the prior art and provide an oil-immersed electric mechanism which can work for a long time in oil.

[0005] To achieve the above purpose, the application adopts the following technical scheme:

[0006] The oil-immersed electric mechanism comprises a motor, a planetary reducer, an output shaft, a feedback assembly and a control module arranged in a shell assembly, the control module is used for sending a control signal to the motor, the motor drives the output shaft to rotate through the planetary reducer, the rear end of the output shaft passes through the shell assembly and is connected to a cross-linking valve, and a sealing element is arranged between the output shaft and the shell assembly;

[0007] The feedback assembly comprises a pin shaft and two micro switches arranged on a mounting plate, the mounting plate is fixedly arranged in the shell assembly, the micro switches are used for sending a switch signal to the control module, the pin shaft is vertically arranged on the mounting plate, the two micro switches are symmetrically arranged on the two sides of the pin shaft, two transmission levers are rotatably arranged on the pin shaft, a spring is arranged between the front ends of the two transmission levers, and the front ends of the two transmission levers are respectively pressed to touch the two micro switches by the spring;

[0008] The output shaft is provided with a touch element opposite to the rear ends of the two transmission levers in the circumferential direction, and the touch element is individually pressed against the rear end of one of the transmission levers by rotating the output shaft in the forward or reverse direction, so that the front end of the corresponding transmission lever overcomes the pressure of the spring and releases the micro switch.

[0009] In order to better realize the present application, further optimization is made in the above structure, the actuating member comprises a positioning block and two positioning screws, the positioning block is fixedly arranged on the output shaft through a fastening screw, two limiting plates are symmetrically arranged on the two sides of the positioning block, and the two positioning screws are threadedly connected with the two limiting plates respectively, and the output shaft is rotated in the forward direction or the reverse direction to enable one of the positioning screws to be individually pressed against the rear end of one transmission lever, and when the output shaft continues to rotate out of control, the limiting plate can be pressed against the mounting plate.

[0010] In order to better realize the present application, further optimization is made in the above structure, the transmission lever is in the shape of "L", mounting grooves are formed in the front ends of the two transmission levers on opposite surfaces, the two ends of the spring are arranged in the two mounting grooves respectively, and the rear ends of the two transmission levers are provided with pressing blocks.

[0011] In order to better realize the present application, further optimization is made in the above structure, the positions of the two mounting grooves are opposite, and the positions of the two pressing blocks are opposite.

[0012] In order to better realize the present application, further optimization is made in the above structure, the planetary reducer comprises a plurality of transmission groups arranged in the inner ring gear from top to bottom in sequence, the inner ring gear is fixedly arranged in the housing assembly, the motor drives the uppermost transmission group, and the lowermost transmission group drives the output shaft to rotate.

[0013] In order to better realize the present application, further optimization is made in the above structure, the transmission group comprises a sun gear, a planet gear and a planet carrier, the sun gear and the inner ring gear are meshed through a plurality of planet gears, the planet gears are rotatably connected with the planet carrier through mounting bearings, the planet carrier is fixedly connected with the sun gear of the lower transmission group, the motor drives the uppermost sun gear, and the lowermost planet carrier is fixedly connected with the output shaft and drives the output shaft to rotate.

[0014] In order to better realize the present application, further optimization is made in the above structure, the housing assembly comprises an upper housing and a lower housing, the upper housing and the lower housing are connected through a connecting plate, sealing members are arranged between the upper housing, the lower housing and the connecting plate, the motor and the control module are fixedly arranged in the upper housing, and the planetary reducer, the output shaft and the feedback assembly are arranged in the lower housing.

[0015] In order to better realize the present application, further optimization is made in the above structure, the housing assembly is made of rust-proof material.

[0016] In order to better realize the present application, further optimization is made in the above structure, the output shaft is rotatably arranged in the lower housing through a supporting bearing.

[0017] In order to better realize the present application, further optimization is made in the above structure, the control module is a circuit control board.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] The oil-immersed electric mechanism provided by the present application utilizes the characteristics of small volume and high reduction ratio of the planetary reducer to provide greater torque for the output shaft; meanwhile, the mechanical linkage control is realized by designing the stable structure of the touch piece and the feedback assembly, and the linkage is realized by setting the spring between the two transmission levers, when the front end of one transmission lever overcomes the pressure of the spring and releases the micro switch, the transmission lever on the other side will be subjected to greater pressure, so as to prevent loosening due to long-term use, so that the switch signal of the micro switch can be accurately sent to the control module, and the transmission can still be stable and accurate signal transmission in a harsh working environment. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0021] Figure 1 is a schematic view of the external structure of the oil-immersed electric mechanism of the present application;

[0022] Figure 2 is a schematic view of the internal structure of the oil-immersed electric mechanism of the present application;

[0023] Figure 3 is a schematic view of the internal structure of the oil-immersed electric mechanism of the present application;

[0024] Figure 4 is a schematic view of the cooperation of the touch piece and the feedback assembly in the present application;

[0025] Figure 5 is a schematic view of the structure of the touch piece in the present application;

[0026] Figure 6 is a schematic view of the structure of the feedback assembly in the present application;

[0027] Figure 7 is a schematic view of the structure of the feedback assembly in the present application;

[0028] Figure 8 is a schematic view of the internal connection structure of the planetary reducer in the present application.

[0029] In the drawings:

[0030] 1 - housing assembly, 101 - upper housing, 102 - lower housing, 103 - connecting plate, 2 - motor, 3 - planetary reducer, 301 - inner ring gear, 302 - sun gear, 303 - planet gear, 304 - planet carrier, 305 - mounting bearing, 4 - output shaft, 401 - support bearing, 5 - feedback assembly, 501 - mounting plate, 502 - pin shaft, 503 - micro switch, 504 - transmission lever, 5041 - mounting groove, 5042 - pressing block, 505 - spring, 6 - control module, 7 - sealing element, 8 - touch element, 801 - positioning block, 8011 - fixing hole, 8012 - limiting plate, 802 - positioning screw. DETAILED DESCRIPTION

[0031] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0032] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present application, it should also be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] Please refer to Figures 1-8The oil-immersed electric mechanism provided by the application comprises a shell assembly 1, a motor 2, a planetary reducer 3, an output shaft 4, a feedback assembly 5 and a control module 6. The shell assembly 1 is made of rust-proof material, and comprises an upper shell 101 and a lower shell 102, which are connected by a connecting plate 103. Sealing elements 7 are arranged between the upper shell 101, the lower shell 102 and the connecting plate 103. The motor 2 and the control module 6 are fixedly arranged in the upper shell 101, and the control module 6 is an electric circuit control board. The control module 6 is used for sending a control signal to the motor 2 to control the motor 2 to rotate in forward and reverse directions. The motor 2 drives the output shaft 4 to rotate through the planetary reducer 3, so that the large torque of the output shaft 4 is transmitted.

[0035] As shown in Figure 3 and Figure 8 The planetary reducer 3 comprises a plurality of transmission groups arranged in the inner gear ring 301 from top to bottom in sequence. The transmission groups are decelerated layer by layer from top to bottom. The inner gear ring 301 is fixedly arranged in the shell assembly 1 through a pin shaft on the outer circumference. The motor 2 drives the uppermost transmission group, and the lowermost transmission group drives the output shaft 4 to rotate. The multi-stage planetary gear transmission group can increase the deceleration ratio and improve the output torque. Meanwhile, the planetary reduction structure is compact, has stable transmission, high space utilization, small volume, large multi-stage series transmission ratio, simple structure, few types of parts, high power split transmission efficiency and other characteristics. In the limited space, sufficient torque can be output. The transmission group comprises a sun gear 302, a planetary gear 303 and a planet carrier 304. The sun gear 302 and the inner gear ring 301 are engaged through three planetary gears 303. The planetary gears 303 are rotatably connected to the planet carrier 304 through mounting bearings 305. The planet carrier 304 is fixedly connected to the sun gear 302 of the lower transmission group. The motor 2 drives the uppermost sun gear 302, and then sequentially drives downward. The lowermost planet carrier 304 is fixedly connected to the output shaft 4 and drives the output shaft 4 to rotate.

[0036] The planetary reducer 3, the output shaft 4 and the feedback assembly 5 are arranged in the lower shell 102, the output shaft 4 is rotatably arranged in the lower shell 102 through the support bearing 401, so that the output shaft 4 can stably transmit power. The rear end of the output shaft 4 penetrates the lower shell 102 and is connected to the cross valve, which is used to control the opening and closing of the cross valve. The output shaft 4 and the lower shell 102 are also provided with a sealing element 7, which can adopt a sealing form such as a sealing ring, a sealing gasket and the like. Since the device is immersed in the oil tank for work, it is necessary to ensure that each performance of the sealing element 7 meets the standard, especially the sealing element 7 between the output shaft 4 and the lower shell 102, which needs to be paid special attention to prevent leakage. In the embodiment, two sealing rings are arranged between the output shaft 4 and the lower shell 102 to achieve double sealing effect. The sealing elements 7 at other positions also need to be sealed in a suitable manner according to the specific position thereof, so the form of the sealing element 7 is not limited thereto, as long as the sealing performance requirement is met.

[0037] As shown in Figures 2-7 The feedback assembly 5 includes a pin shaft 502 arranged on a mounting plate 501 and two micro switches 503, the micro switches 503 are fixedly connected to the mounting plate 501 through pins, and the mounting plate 501 is fixedly arranged in the shell assembly 1 and used to support the related parts of the feedback assembly 5. The micro switches 503 are used to send a switching signal to the control module 6, so that the control module 6 obtains the rotation condition of the output shaft 4, thereby forming a closed-loop control to avoid the situation that the output shaft 4 does not act after the control module 6 sends a rotation signal to the motor 2, and to provide accurate position information support for the next step of controlling the output shaft 4 to act. The specific structure is that the pin shaft 502 is vertically arranged on the mounting plate 501, the two micro switches 503 are symmetrically arranged on the two sides of the pin shaft 502, two transmission levers 504 are rotatably arranged on the pin shaft 502, a spring 505 is arranged between the front ends of the two transmission levers 504, and the spring 505 pushes the front ends of the two transmission levers 504 to press and touch the two micro switches 503, respectively. The transmission lever 504 is in the shape of “L”, the two “L” shaped transmission levers 504 are symmetrically arranged, the front ends of the two transmission levers 504 are provided with mounting grooves 5041 on the opposite surfaces, the two ends of the spring 505 are arranged in the two mounting grooves 5041, so that the spring 505 can remain in the same position during the compression and expansion movement, the rear ends of the two transmission levers 504 are provided with pressing blocks 5042, which are used to increase the surface area and make the transmission levers 504 better abut against the touch element 8 to complete the transmission. The positions of the two mounting grooves 5041 are opposite, and the positions of the two pressing blocks 5042 are opposite. By modifying the front and rear ends of the transmission lever 504 and adding an extension part, the two ends of the transmission lever 504 are in the opposite position, so as to avoid the influence caused by the misalignment of the two transmission levers 504.

[0038] As shown in Figures 2-5As shown, the output shaft 4 is provided with a touch member 8 opposite to the rear end of the two transmission levers 504 in the circumferential direction, and the touch member 8 is synchronously driven to rotate by the output shaft 4, so that the touch member 8 can transmit power to the rear end of the two transmission levers 504. The touch member 8 includes a positioning block 801 and two positioning screws 802,

[0039] The positioning block 801 is fixedly connected with the output shaft 4 through a fixing hole 8011 on the positioning block 801 and a fastening screw, so that the positioning block 801 rotates synchronously with the output shaft 4. Two limiting plates 8012 are symmetrically arranged on the two sides of the positioning block 801, and the two positioning screws 802 are threadedly connected with the two limiting plates 8012, respectively. Forward or reverse rotation of the output shaft 4 can make one of the positioning screws 802 independently abut against the rear end of one transmission lever 504, so that the front end of the transmission lever 504 corresponding to the rear end overcomes the pressure of the spring 505 and releases the micro switch 503. At the same time, the micro switch 503 feeds back a to-position signal to the control module 6. The control module 6 receives the to-position signal and obtains real-time position information of the output shaft 4, so as to switch the current direction according to the position information to control the motor 2 to rotate forward or reverse, or to keep the output shaft 4 at a specified angle. In addition, in order to improve the reliability, the control module 6 also has anti-reverse connection and overvoltage protection functions.

[0040] As shown in FIG. 4, Figure 2 The mounting plate 501 is provided with an abutting portion opposite to the limiting plate 8012. When the output shaft 4 continues to rotate out of control, the limiting plate 8012 can abut against the abutting portion of the mounting plate 501 to prevent the valve from stopping rotating after the control module 6 fails out of control. The design is that the rotation angle of the limiting plate 8012 is slightly larger than the rotation angle of the valve. If the valve rotates abnormally beyond the required range, the limiting plate 8012 will abut against the mounting plate 501 to stop the valve from rotating.

[0041] When it is necessary to adjust the rotation angle of the output shaft 4, it is only necessary to adjust the length of the distance between the positioning screw 802 and the rear end of the transmission lever 504. For example, if it is necessary to increase the rotation angle of the output shaft 4 according to the cross-linking valve, the positioning screw 802 is rotated to increase the distance between the end of the positioning screw 802 and the rear end of the transmission lever 504. Thus, when the output shaft 4 rotates, the output shaft 4 needs to rotate a longer distance to touch the rear end of the transmission lever 504, so the rotation angle of the output shaft 4 is also increased, the time for the front end of the transmission lever 504 to release the micro switch 503 is also increased, and the time for the control module 6 to receive the signal is also increased, so that the cycle of the closed loop is also increased. Conversely, if it is necessary to reduce the rotation angle of the output shaft 4, it is only necessary to reduce the length of the distance between the positioning screw 802 and the rear end of the transmission lever 504 to shorten the cycle of the closed loop.

[0042] Working principle:

[0043] When the control module 6 is inputted with the working instruction, the control module 6 controls the motor 2 to start and drive the planetary reducer 3 to move, the planetary reducer 3 then transmits power to the output shaft 4, finally the output shaft 4 outputs large torque to the cross-link valve matched with it, controls the action of the cross-link valve, and the positioning block 801 rotates synchronously with the output shaft 4, when the output shaft 4 rotates to the specified angle, the positioning screw 802 on the positioning block 801 pushes the rear end of a transmission lever 504 at the same time, the front end of the transmission lever 504 overcomes the pressure of the spring 505 and releases the micro switch 503 pressed by the spring 505, the micro switch 503 is bounced up, and the in-place signal is fed back to the control module 6, the control module 6 receives the sent in-place signal, the motor 2 keeps the output shaft 4 at the specified angle (or controls the motor 2 to reverse rotation by switching the current direction), and the position of the output shaft 4 can be fed back to the control module 6 in real time, so as to realize closed-loop control and accurately control the rotation angle of the output shaft 4.

[0044] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An oil-immersed electric motor characterized by comprising: The application relates to a crosslinking valve control device, which comprises a motor (2), a planetary reducer (3), an output shaft (4), a feedback assembly (5) and a control module (6) arranged in a shell assembly (1), the control module (6) is used for sending a control signal to the motor (2), the motor (2) drives the output shaft (4) to rotate through the planetary reducer (3), the rear end of the output shaft (4) penetrates through the shell assembly (1) and is connected to a crosslinking valve, and a sealing element (7) is arranged between the output shaft (4) and the shell assembly (1). The feedback assembly (5) comprises a pin shaft (502) and two micro switches (503) arranged on a mounting plate (501), the mounting plate (501) is fixedly arranged in the shell assembly (1), the micro switches (503) are used for sending a switch signal to the control module (6), the pin shaft (502) is vertically arranged on the mounting plate (501), the two micro switches (503) are symmetrically arranged on the two sides of the pin shaft (502), two transmission levers (504) are rotatably arranged on the pin shaft (502), a spring (505) is arranged between the front ends of the two transmission levers (504), and the spring (505) pushes the front ends of the two transmission levers (504) to press and touch the two micro switches (503) respectively. The output shaft (4) is provided with a touching element (8) opposite to the rear ends of the two transmission levers (504) in the circumferential direction, and the touching element (8) is pressed to the rear end of one of the transmission levers (504) when the output shaft (4) is rotated in the forward direction or the reverse direction, so that the front end of the corresponding transmission lever (504) overcomes the pressure of the spring (505) and releases the micro switch (503).

2. An oil-immersed electric motor according to claim 1, characterized by: The touching element (8) comprises a positioning block (801) and two positioning screws (802), the positioning block (801) is fixedly arranged on the output shaft (4) through a fastening screw, two limiting plates (8012) are symmetrically arranged on the two sides of the positioning block (801), the two positioning screws (802) are threadedly connected with the two limiting plates (8012) respectively, one of the positioning screws (802) is pressed to the rear end of one of the transmission levers (504) when the output shaft (4) is rotated in the forward direction or the reverse direction, and the limiting plate (8012) can be pressed to the mounting plate (501) when the output shaft (4) is out of control and continues to rotate.

3. An oil-immersed electric motor according to claim 2, characterized in that: The transmission lever (504) is in an "L" shape, mounting grooves (5041) are formed in the front ends of the two transmission levers (504) on opposite surfaces, the two ends of the spring (505) are arranged in the two mounting grooves (5041) respectively, and the rear ends of the two transmission levers (504) are provided with pressing blocks (5042).

4. An oil-immersed electric motor according to claim 3, characterized in that: The positions of the two mounting grooves (5041) are opposite, and the positions of the two pressing blocks (5042) are opposite.

5. An oil-immersed electric motor according to claim 1, characterized by: The planetary reducer (3) comprises a plurality of transmission groups arranged in the inner tooth ring (301) from top to bottom in sequence, the inner tooth ring (301) is fixedly arranged in the shell assembly (1), the motor (2) drives the uppermost transmission group, and the lowermost transmission group drives the output shaft (4) to rotate.

6. An oil-immersed electric motor according to claim 5, characterized in that: The transmission group comprises a sun gear (302), a planet gear (303) and a planet carrier (304), the sun gear (302) and the inner tooth ring (301) are meshed through a plurality of planet gears (303), the planet gears (303) are rotatably connected with the planet carrier (304) through mounting bearings (305), the planet carrier (304) is fixedly connected with the sun gear (302) of the lower transmission group, the motor (2) drives the uppermost sun gear (302), and the lowermost planet carrier (304) is fixedly connected with the output shaft (4) and drives the output shaft (4) to rotate.

7. An oil-immersed electric motor according to claim 1, characterized in that: The shell assembly (1) comprises an upper shell (101) and a lower shell (102), the upper shell (101) and the lower shell (102) are connected through a connecting plate (103), sealing elements (7) are also arranged between the upper shell (101), the lower shell (102) and the connecting plate (103), the motor (2) and the control module (6) are fixedly arranged in the upper shell (101), and the planetary reducer (3), the output shaft (4) and the feedback assembly (5) are arranged in the lower shell (102).

8. An oil-immersed electric motor according to claim 7, characterized in that: The shell assembly (1) is made of rust-proof material.

9. An oil-immersed electric motor according to claim 7, characterized in that: The output shaft (4) is rotatably arranged in the lower shell (102) through a supporting bearing (401).

10. An oil-immersed electric motor according to claim 1, characterized in that: The control module (6) is a circuit control board.

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