A sealed motor structure that is water-proof

Abstract

The invention discloses a water-proof sealed motor structure, which relates to the technical field of motors and comprises a casing, a stator assembly, a rotor assembly, a motor shaft, a front cover and a rear cover. The scheme aims at two different speed working conditions of the motor, namely high speed and water wading. By arranging a sealing ring with elastic deformation performance, when the motor is running at a low speed while wading through water, a multi-pass sealing structure is formed between four lips on the sealing ring and the overall sealing inner cover, which can effectively ensure the sealing effect of the overall motor structure and prevent water from entering the motor. When the motor is not running at a high speed while wading through water, the four lips on the sealing ring are separated from the overall sealing inner cover under the action of centrifugal force, thereby reducing the friction and heat generation between each lip and the fixed cover plate and the sealing cover, thereby effectively extending the service life of each sealing component. At this time, the other lip is pressed against the sealing cover under the action of centrifugal force, which can effectively prevent the lubricating oil inside the motor from being thrown out.

Description

Technical Field

[0001] The invention relates to a water-proof sealed motor structure, belonging to the technical field of motors. Background Art

[0002] At present, the bearing seals at the motor shaft extension are mostly contact-type lip seals (hereinafter referred to as oil seals); when the motor shaft rotates during operation, the outer diameter of the motor shaft and the contact surface of the oil seal lip generate rotational friction, and long-term contact friction will cause the lip to wear, thus affecting the sealing effect. In addition, the contact friction between the motor shaft and the lip, especially the contact friction when the motor shaft rotates at high speed, will cause a large amount of friction heat to be generated at the contact part, which will not only further cause the aging of the oil seal, but also affect the service life of the bearing installed near the oil seal to a certain extent.

[0003] For automotive drive motors, when the vehicle is running normally, the motor shaft rotates at high speed, and the large clamping force causes the sealing position to wear quickly, affecting the sealing effect, and generates a large amount of friction heat, affecting the service life of the oil seal itself and nearby parts; later, when the motor wades in rainy weather, water will enter the motor through the worn part of the lip, causing the bearing to fail due to water ingress, so a new solution is needed to solve this problem. Summary of the invention

[0004] In view of the above-mentioned technical problems, the purpose of the present invention is to provide a water-proof sealed motor structure.

[0005] The technical solution of the present invention is achieved as follows: a water-proof sealed motor structure, comprising a casing, a stator assembly, a rotor assembly, a motor shaft, a front cover and a rear cover; the stator assembly is connected and fixed to the inner wall of the casing, the rotor assembly is sleeved on the motor shaft, the stator assembly and the rotor assembly cooperate with each other, the front cover and the rear cover are respectively fixed to the front and rear ends of the casing, the two ends of the motor shaft are respectively rotatably matched with the front cover and the rear cover, and one end of the motor shaft passes through the center of the front cover and extends outward;

[0006] The front end cover is provided with a sealing inner cover, and the sealing inner cover includes a fixed cover plate and a sealing cover, the fixed cover plate is connected and fixed to the front end cover, and the sealing cover is connected and fixed to the fixed cover plate, the motor shaft passes through the center of the fixed cover plate, and the fixed cover plate is provided with a first sealing groove; the fixed cover plate is concentrically provided with a first annular convex strip, a second annular convex strip and a third annular convex strip, and the first annular convex strip is located on the outer side of the second annular convex strip, and the third annular convex strip is located on the inner side of the second annular convex strip; the first sealing groove is formed between the first annular convex strip and the second annular convex strip, and a second sealing groove is formed between the second annular convex strip and the third annular convex strip, the sealing cover is fixed in the second sealing groove, and a gap is left between the sealing cover and the second annular convex strip; the sealing cover is provided with an inner sealing part, an outer sealing part and a bottom sealing part, and a cavity structure is formed between the inner sealing part and the outer sealing part;

[0007] A sealing outer cover is provided on the motor shaft, and the sealing outer cover includes a water-slinging ring and a sealing ring. The water-slinging ring is sleeved on the motor shaft and has an interference fit with the motor shaft, and the outer edge of the water-slinging ring extends into the first sealing groove of the fixed cover plate; the sealing ring is fixed on the water-slinging ring, and the sealing ring has elastic deformation performance, and the sealing ring is provided with a first sealing ring, a second sealing ring, a third sealing ring, a fourth sealing ring and a fifth sealing ring which are arranged obliquely, and the ends of the first sealing ring, the second sealing ring, the third sealing ring, the fourth sealing ring and the fifth sealing ring respectively have a first lip, a second lip, a third lip, a fourth lip and a fifth lip; the second lip extends into the gap between the sealing cover and the second annular convex strip, and the third lip, the fourth lip and the fifth lip all extend into the cavity structure formed between the inner sealing part and the outer sealing part;

[0008] When the motor shaft is stationary or rotates at a low speed, the first lip presses the second annular convex strip on the fixed cover plate, the second lip presses the outer wall of the outer sealing part, the third lip just contacts the inner wall of the outer sealing part, the fourth lip presses the inner wall of the bottom sealing part, and the fifth lip presses the inner wall of the inner sealing part; when the motor shaft rotates at a high speed, the first lip disengages from the second annular convex strip on the fixed cover plate, the second lip disengages from the outer wall of the outer sealing part, the third lip presses the inner wall of the outer sealing part, the fourth lip disengages from the inner wall of the bottom sealing part, and the fifth lip disengages from the inner wall of the inner sealing part.

[0009] Preferably, the sealing cover has a U-shaped cross section, and the sealing cover and the fixed cover plate are an integral structure.

[0010] Preferably, the inner sealing part of the sealing cover is in close contact with the third annular convex strip, and the inner sealing part is connected and fixed to the third annular convex strip; the bottom sealing part of the sealing cover is in close contact with the bottom of the second sealing groove, and the bottom sealing part is connected and fixed at the bottom of the second sealing groove.

[0011] Preferably, the longitudinal cross-sectional area of ​​the first lip is larger than the longitudinal cross-sectional area of ​​the first sealing ring, the longitudinal cross-sectional area of ​​the second lip is larger than the longitudinal cross-sectional area of ​​the second sealing ring, the longitudinal cross-sectional area of ​​the third lip is larger than the longitudinal cross-sectional area of ​​the third sealing ring, the longitudinal cross-sectional area of ​​the fourth lip is larger than the longitudinal cross-sectional area of ​​the fourth sealing ring, and the longitudinal cross-sectional area of ​​the fifth lip is larger than the longitudinal cross-sectional area of ​​the fifth sealing ring.

[0012] Preferably, the sealing ring is made of rubber, and the first sealing ring, the second sealing ring, the third sealing ring, the fourth sealing ring and the fifth sealing ring are all integrally formed on the sealing ring, and the first lip, the second lip, the third lip, the fourth lip and the fifth lip are respectively integrally formed on the first sealing ring, the second sealing ring, the third sealing ring, the fourth sealing ring and the fifth sealing ring.

[0013] Preferably, a groove structure is formed between the inner edge and the outer edge of the water-slinging ring, the sealing ring is connected and fixed in the groove structure, and the outer edge of the water-slinging ring is inclined outward.

[0014] Preferably, the front end cover is provided with a front bearing, and the front end of the motor shaft is rotatably engaged with the front end cover via the front bearing, and the rear end cover is provided with a rear bearing, and the rear end of the motor shaft is rotatably engaged with the rear end cover via the rear bearing.

[0015] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0016] 1. A water-proof sealed motor structure of the present invention aims at two different speed conditions of the motor, high speed and water wading, by arranging a sealing ring with elastic deformation performance. When the motor is running at a low speed through water wading, a multi-pass sealing structure is formed between the four lips on the sealing ring and the overall sealing inner cover, which can effectively ensure the sealing effect of the overall motor structure and prevent water from entering the motor. When the motor is running at a high speed without wading, the four lips on the sealing ring are separated from the overall sealing inner cover under the action of centrifugal force, thereby reducing the friction and heat generation between each lip and the fixed cover plate and the sealing cover, thereby effectively extending the service life of each sealing component. At this time, the other lip is pressed against the sealing cover under the action of centrifugal force, which can effectively prevent the lubricating oil inside the motor from being thrown out.

[0017] 2. By setting the outer edge of the water-slinging ring to an outwardly inclined structure and extending the outer edge of the water-slinging ring into the first sealing groove, the water-slinging ring can prevent external water from entering the fixed cover plate when rotating with the motor shaft, and at the same time, a small amount of water inside the fixed cover plate can be thrown out. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0019] Attached Figure 1 This is a schematic structural diagram of a water-proof sealed motor structure according to the present invention;

[0020] Attached Figure 2 A cross-sectional view of a water-proof sealed motor structure according to the present invention;

[0021] Attached Figure 3 For attachment Figure 2 The enlarged view of point A in the middle;

[0022] Attached Figure 4 For attachment Figure 3 The enlarged view of point B in the middle;

[0023] Attached Figure 5 It is a structural schematic diagram of the sealing inner cover of the present invention;

[0024] Attached Figure 6 is a cross-sectional view of the sealing inner cover of the present invention;

[0025] Attached Figure 7 It is a structural schematic diagram of the sealing outer cover of the present invention;

[0026] Attached Figure 8 It is a cross-sectional view of the sealing outer cover of the present invention.

[0027] In the figure: 1, casing; 2, stator assembly; 3, rotor assembly; 4, motor shaft; 5, front cover; 51, front bearing; 6, rear cover; 61, rear bearing; 7, fixed cover plate; 71, first sealing groove; 72, first annular convex strip; 73, second sealing groove; 74, second annular convex strip; 75, third annular convex strip; 8, sealing cover; 81, inner sealing part; 82, outer sealing part; 83, bottom sealing part; 9, sealing ring; 91, first sealing ring; 911, first lip; 92, second sealing ring; 921, second lip; 93, third sealing ring; 931, third lip; 94, fourth sealing ring; 941, fourth lip; 95, fifth sealing ring; 951, fifth lip; 10, water-throwing ring. DETAILED DESCRIPTION

[0028] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "straight", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] like Figure 1-Figure 2 As shown, a water-proof sealed motor structure described in the present invention is applied to road vehicles, comprising a casing 1, a stator assembly 2, a rotor assembly 3, a motor shaft 4, a front end cover 5 and a rear end cover 6; the stator assembly 2 is connected and fixed to the inner wall of the casing 1, the rotor assembly 3 is sleeved on the motor shaft 4, the stator assembly 2 and the rotor assembly 3 cooperate with each other, the front end cover 5 and the rear end cover 6 are respectively fixed to the front and rear ends of the casing 1, and the two ends of the motor shaft 4 are respectively rotatably matched with the front end cover 5 and the rear end cover 6, wherein a front bearing 51 is provided on the front end cover 5, and the front end of the motor shaft 4 is rotatably matched with the front end cover 5 through the front bearing 51, and a rear bearing 61 is provided on the rear end cover 6, and the rear end of the motor shaft 4 is rotatably matched with the rear end cover 6 through the rear bearing 61, and one end of the motor shaft 4 passes through the center of the front end cover 5 and extends outward.

[0032] like Figure 3-Figure 6As shown, a sealing inner cover is provided on the front end cover 5, and the sealing inner cover includes a fixed cover plate 7 and a sealing cover 8. The fixed cover plate 7 is fixed to the front end cover 5 by a plurality of bolts, and the sealing cover 8 is connected and fixed to the fixed cover plate 7. The motor shaft 4 passes through the center of the fixed cover plate 7, and the fixed cover plate 7 has a first sealing groove 71.

[0033] A first annular ridge 72, a second annular ridge 74 and a third annular ridge 75 are concentrically arranged on the fixed cover plate 7. In the present embodiment, the first annular ridge 72, the second annular ridge 74 and the third annular ridge 75 are all integrally formed on the fixed cover plate 7; the first annular ridge 72 is located on the outer side of the second annular ridge 74, and the third annular ridge 75 is located on the inner side of the second annular ridge 74; a first sealing groove 71 is formed between the first annular ridge 72 and the second annular ridge 74, and a second sealing groove 73 is formed between the second annular ridge 74 and the third annular ridge 75.

[0034] In this embodiment, the cross-section of the sealing cover 8 is U-shaped, and the sealing cover 8 is fixed in the second sealing groove 73 formed between the second annular ridge 74 and the third annular ridge 75. Specifically, the sealing cover 8 has an inner sealing portion 81, an outer sealing portion 82 and a bottom sealing portion 83, and a cavity structure is formed between the inner sealing portion 81 and the outer sealing portion 82. The inner sealing portion 81 of the sealing cover 8 is tightly against the third annular ridge 75, and the inner sealing portion 81 is connected and fixed to the third annular ridge 75; the bottom sealing portion 83 of the sealing cover 8 is tightly against the bottom of the second sealing groove 73, and the bottom sealing portion 83 is connected and fixed at the bottom of the second sealing groove 73, so that the sealing cover 8 and the fixed cover plate 7 become an integral structure, and a gap is left between the sealing cover 8 and the second annular ridge 74.

[0035] The material of the fixed cover plate 7 and the sealing cover 8 is required to have good wear resistance and rust resistance. Sheet metal parts can be directly used to reduce the overall weight of the structure. The specific material is not limited and certain surface treatments such as galvanizing can also be performed.

[0036] like Figure 3-Figure 8 As shown, a sealed outer cover is provided on the motor shaft 4, and the sealed outer cover includes a water-slinging ring 10 and a sealing ring 9. The water-slinging ring 10 is sleeved on the motor shaft 4 and has an interference fit with the motor shaft 4. The water-slinging ring 10 rotates with the rotation of the motor shaft 4, and the outer edge of the water-slinging ring 10 extends into the first sealing groove 71 of the fixed cover plate 7; the sealing ring 9 is fixed on the water-slinging ring 10. Specifically, a groove structure is formed between the inner edge and the outer edge of the water-slinging ring 10, and the sealing ring 9 is connected and fixed in the groove structure. The sealing ring 9 and the water-slinging ring 10 can be fixed by bonding, crimping, injection molding, etc.

[0037] The material of the water slinger 10 is required to have good wear resistance and rust resistance, and sheet metal can be directly used to reduce the overall weight of the structure. The specific material is not limited, and certain surface treatments such as galvanizing can also be performed.

[0038] The sealing ring 9 has elastic deformation performance, and has a first sealing ring 91, a second sealing ring 92, a third sealing ring 93, a fourth sealing ring 94 and a fifth sealing ring 95 which are arranged obliquely, and the ends of the first sealing ring 91, the second sealing ring 92, the third sealing ring 93, the fourth sealing ring 94 and the fifth sealing ring 95 respectively have a first lip 911, a second lip 921, a third lip 931, a fourth lip 941 and a fifth lip 951; in this embodiment, the sealing ring 9 is made of rubber material, and the first sealing ring 91, the second sealing ring 92, the third sealing ring 93, the fourth sealing ring 94 and the fifth sealing ring 95 are all integrally formed on the sealing ring 9, and the first lip 911, the second lip 921, the third lip 931, the fourth lip 941 and the fifth lip 951 are respectively integrally formed on the first sealing ring 91, the second sealing ring 92, the third sealing ring 93, the fourth sealing ring 94 and the fifth sealing ring 95.

[0039] like Figure 3-Figure 4 As shown, when the motor shaft 4 is stationary or rotates at a low speed, the first lip 911 presses the fixed cover plate 7, the second lip 921, the fourth lip 941 and the fifth lip 951 all press the sealing cover 8, and the third lip 931 just contacts the sealing cover 8; when the motor shaft 4 rotates at a high speed, the first lip 911 is disengaged from the fixed cover plate 7 driven by the motor shaft 4, the second lip 921, the fourth lip 941 and the fifth lip 951 are disengaged from the sealing cover 8 driven by the motor shaft 4, and the third lip 931 presses the sealing cover 8 driven by the motor shaft 4.

[0040] The motor structure of the present application is applied to road vehicles. Therefore, the low-speed rotation of the motor shaft 4 described in the present application refers to the common speed of the motor when the road vehicle is wading, and the high-speed rotation of the motor shaft 4 refers to the common speed of the motor when the road vehicle is not wading.

[0041] Specifically, when the motor shaft 4 is stationary or rotates at a low speed, the first lip 911 presses the second annular ridge 74 on the fixed cover plate 7, the second lip 921 extends into the gap between the sealing cover 8 and the second annular ridge 74, the third lip 931, the fourth lip 941 and the fifth lip 951 all extend into the cavity structure formed between the inner sealing portion 81 and the outer sealing portion 82, the second lip 921 presses the outer wall of the outer sealing portion 82, and the third lip 931 just contacts the inner wall of the outer sealing portion 82. , the fourth lip 941 presses the inner wall of the bottom sealing part 83, and the fifth lip 951 presses the inner wall of the inner sealing part 81; when the motor shaft 4 rotates at high speed, the first lip 911 disengages from the second annular ridge 74 on the fixed cover plate 7, the second lip 921 disengages from the outer wall of the outer sealing part 82, the third lip 931 presses the inner wall of the outer sealing part 82, the fourth lip 941 disengages from the inner wall of the bottom sealing part 83, and the fifth lip 951 disengages from the inner wall of the inner sealing part 81.

[0042] The motor structure of this application has three states:

[0043] The first state is: when the motor is not working, that is, the initial state of the motor, the motor shaft 4 is in a stationary state, and the sealing ring 9 fixed on the motor shaft 4 does not generate centrifugal force. At this time, the first lip 911 is pressed against the second annular ridge 74 on the fixed cover plate 7, the second lip 921 is pressed against the outer wall of the outer sealing part 82, the third lip 931 is just in contact with the inner wall of the outer sealing part 82, the fourth lip 941 is pressed against the inner wall of the bottom sealing part 83, and the fifth lip 951 is pressed against the inner wall of the inner sealing part 81 to ensure the sealing effect.

[0044] The second state is: when the motor is wading, the motor shaft 4 rotates at a low speed. When the motor shaft 4 drives the sealing ring 9 to rotate, the centrifugal force generated by the first sealing ring 91, the second sealing ring 92, the third sealing ring 93, the fourth sealing ring 94 and the fifth sealing ring 95 on the sealing ring 9 is small, and the first sealing ring 91, the second sealing ring 92, the third sealing ring 93, the fourth sealing ring 94 and the fifth sealing ring 95 produce a small elastic deformation under the action of the centrifugal force. The elastic deformation is not enough to make the first lip 911 on the first sealing ring 91 detach from the second annular convex strip 74 on the fixed cover plate 7, the second lip 921 on the second sealing ring 92 detach from the outer wall of the outer sealing portion 82, the fourth lip 941 on the fourth sealing ring 94 detach from the inner wall of the bottom sealing portion 83 and the fifth lip 941 on the fifth sealing ring 95 detach from the inner wall of the bottom sealing portion 83. The opening 951 is separated from the inner wall of the inner sealing part 81, so that a first sealing structure is formed between the first lip 911 and the second annular convex strip 74 on the fixed cover plate 7, a second sealing structure is formed between the second lip 921 and the outer sealing part 82, a third sealing structure is formed between the fourth lip 941 and the bottom sealing part 83, and a fourth sealing structure is formed between the fifth lip 951 and the inner sealing part 81; through the above four sealing structures, the sealing effect of the overall motor structure can be effectively guaranteed to prevent water from entering the motor when the motor is wading and causing internal parts to malfunction; the outer edge of the water-slinging ring 10 is tilted outward and extends into the first sealing groove 71. When the water-slinging ring 10 rotates with the motor shaft 4, it can prevent external water from entering the fixed cover plate 7, and at the same time, a small amount of water inside the fixed cover plate 7 can be thrown out.

[0045] The third state is: when the motor is not wading, the motor shaft 4 rotates at a high speed, and the motor shaft 4 drives the sealing ring 9 to rotate at a high speed. When the sealing ring 9 rotates at a high speed, the centrifugal force generated by the first sealing ring 91, the second sealing ring 92, the third sealing ring 93, the fourth sealing ring 94 and the fifth sealing ring 95 increases, and the first sealing ring 91, the second sealing ring 92, the third sealing ring 93, the fourth sealing ring 94 and the fifth sealing ring 95 produce a large elastic deformation under the action of the centrifugal force, so that the first lip 911 on the first sealing ring 91 is out of contact with the second annular convex strip 74 on the fixed cover plate 7, and the second lip 921 on the second sealing ring 92 is out of contact with the sealing cover 8. The outer sealing portion 82 is disengaged, the fourth lip 941 on the fourth sealing ring 94 is disengaged from the bottom sealing portion 83 of the sealing cover 8, and the fifth lip 951 on the fifth sealing ring 95 is disengaged from the inner sealing portion 81 of the sealing cover 8, thereby reducing the friction and heat between the first lip 911 and the fixed cover plate 7 and between the second lip 921, the fourth lip 941 and the fifth lip 951 and the sealing cover 8, thereby ensuring the service life of the overall sealing ring 9, the fixed cover plate 7 and the sealing cover 8; at this time, the third lip 931 on the third sealing ring 93 is tilted and pressed against the outer sealing portion 82 of the sealing cover 8 to prevent the lubricating oil inside the motor from being thrown out.

[0046] As a preferred embodiment, the longitudinal cross-sectional area of ​​the first lip 911 is larger than the longitudinal cross-sectional area of ​​the first sealing ring 91, the longitudinal cross-sectional area of ​​the second lip 921 is larger than the longitudinal cross-sectional area of ​​the second sealing ring 92, the longitudinal cross-sectional area of ​​the third lip 931 is larger than the longitudinal cross-sectional area of ​​the third sealing ring 93, the longitudinal cross-sectional area of ​​the fourth lip 941 is larger than the longitudinal cross-sectional area of ​​the fourth sealing ring 94, and the longitudinal cross-sectional area of ​​the fifth lip 951 is larger than the longitudinal cross-sectional area of ​​the fifth sealing ring 95, which is equivalent to the longitudinal cross-sectional area of ​​the first lip 911 and the second lip 92 1. The ends of the third lip 931, the fourth lip 941 and the fifth lip 951 are made into thick structures to increase the sealing surface when the first lip 911 contacts the second annular convex strip 74 on the fixed cover plate 7, the second lip 921 contacts the outer sealing portion 82 of the sealing cover 8, the third lip 931 contacts the outer sealing portion 82 of the sealing cover 8, the fourth lip 941 contacts the bottom sealing portion 83 of the sealing cover 8, and the fifth lip 951 contacts the inner sealing portion 81 of the sealing cover 8, so as to obtain a better sealing effect and enhance the centrifugal effect during rotation.

[0047] In actual use, the longitudinal cross-sectional areas of the first lip 911 , the second lip 921 , the third lip 931 , the fourth lip 941 and the fifth lip 951 can be adjusted according to the actual required centrifugal force.

[0048] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A water-proof sealed motor structure, characterized in that: The invention comprises a casing (1), a stator assembly (2), a rotor assembly (3), a motor shaft (4), a front end cover (5) and a rear end cover (6); the stator assembly (2) is connected and fixed to the inner wall of the casing (1); the rotor assembly (3) is sleeved on the motor shaft (4); the stator assembly (2) and the rotor assembly (3) cooperate with each other; the front end cover (5) and the rear end cover (6) are respectively fixed to the front and rear ends of the casing (1); the two ends of the motor shaft (4) are respectively rotatably matched with the front end cover (5) and the rear end cover (6); one end of the motor shaft (4) passes through the center of the front end cover (5) and extends outward; The front end cover (5) is provided with a sealing inner cover, and the sealing inner cover comprises a fixed cover plate (7) and a sealing cover (8). The fixed cover plate (7) is connected and fixed to the front end cover (5), and the sealing cover (8) is connected and fixed to the fixed cover plate (7). The motor shaft (4) passes through the center of the fixed cover plate (7), and the fixed cover plate (7) has a first sealing groove (71); the fixed cover plate (7) is concentrically provided with a first annular convex strip (72), a second annular convex strip (74) and a third annular convex strip (75), and the The first annular convex strip (72) is located on the outer side of the second annular convex strip (74), and the third annular convex strip (75) is located on the inner side of the second annular convex strip (74); the first sealing groove (71) is formed between the first annular convex strip (72) and the second annular convex strip (74), and a second sealing groove (73) is formed between the second annular convex strip (74) and the third annular convex strip (75); the sealing cover (8) is fixed in the second sealing groove (73), and a gap is left between the sealing cover (8) and the second annular convex strip (74); The motor shaft (4) is provided with a sealing outer cover, the sealing outer cover comprising a water-slinging ring (10) and a sealing ring (9); the water-slinging ring (10) is sleeved on the motor shaft (4) and is interference-fitted with the motor shaft (4); the outer edge of the water-slinging ring (10) extends into a first sealing groove (71) of the fixed cover plate (7); the sealing ring (9) is fixed on the water-slinging ring (10); the sealing ring (9) has elastic deformation performance, and the sealing ring (9) has a first sealing ring (91), a second sealing ring (92), a third sealing ring (93), a fourth sealing ring (94) and a fifth sealing ring (95) arranged obliquely; the first sealing ring (91), the second sealing ring (92), the third sealing ring (93), the fourth sealing ring (94) and the fifth sealing ring (95) have a first lip (911), a second lip (921), a third lip (931), a fourth lip (941) and a fifth lip (951) at the ends thereof, respectively; When the motor shaft (4) is stationary or rotates at a low speed, the first lip (911) presses the fixed cover plate (7), the second lip (921), the fourth lip (941) and the fifth lip (951) all press the sealing cover (8), and the third lip (931) just contacts the sealing cover (8); when the motor shaft (4) rotates at a high speed, the first lip (911) is driven by the motor shaft (4) to break away from contact with the fixed cover plate (7), the second lip (921), the fourth lip (941) and the fifth lip (951) are driven by the motor shaft (4) to break away from contact with the sealing cover (8), and the third lip (931) is driven by the motor shaft (4) to press the sealing cover (8).

2. The water-proof sealed motor structure according to claim 1, characterized in that: When the motor shaft (4) is stationary or rotates at a low speed, the first lip (911) presses the second annular convex strip (74) on the fixed cover plate (7); when the motor shaft (4) rotates at a high speed, the first lip (911) is out of contact with the second annular convex strip (74) on the fixed cover plate (7).

3. The water-proof sealed motor structure according to claim 1, characterized in that: The sealing cover (8) has an inner sealing portion (81), an outer sealing portion (82) and a bottom sealing portion (83), and a cavity structure is formed between the inner sealing portion (81) and the outer sealing portion (82); the second lip (921) extends into the gap between the sealing cover (8) and the second annular convex strip (74), and the third lip (931), the fourth lip (941) and the fifth lip (951) all extend into the cavity structure formed between the inner sealing portion (81) and the outer sealing portion (82); When the motor shaft (4) is stationary or rotates at a low speed, the second lip (921) presses the outer wall of the outer sealing part (82), the third lip (931) just contacts the inner wall of the outer sealing part (82), the fourth lip (941) presses the inner wall of the bottom sealing part (83), and the fifth lip (951) presses the inner wall of the inner sealing part (81); when the motor shaft (4) rotates at a high speed, the second lip (921) is out of contact with the outer wall of the outer sealing part (82), the third lip (931) is out of contact with the inner wall of the outer sealing part (82), the fourth lip (941) is out of contact with the inner wall of the bottom sealing part (83), and the fifth lip (951) is out of contact with the inner wall of the inner sealing part (81).

4. The water-proof sealed motor structure according to claim 3, characterized in that: The sealing cover (8) has a U-shaped cross section, and the sealing cover (8) and the fixed cover plate (7) are an integral structure.

5. The water-proof sealed motor structure according to claim 3, characterized in that: The inner sealing portion (81) of the sealing cover (8) is in close contact with the third annular convex strip (75), and the inner sealing portion (81) is connected and fixed to the third annular convex strip (75); the bottom sealing portion (83) of the sealing cover (8) is in close contact with the bottom of the second sealing groove (73), and the bottom sealing portion (83) is connected and fixed to the bottom of the second sealing groove (73).

6. The water-proof sealed motor structure according to claim 1, characterized in that: The longitudinal cross-sectional area of ​​the first lip (911) is larger than the longitudinal cross-sectional area of ​​the first sealing ring (91), the longitudinal cross-sectional area of ​​the second lip (921) is larger than the longitudinal cross-sectional area of ​​the second sealing ring (92), the longitudinal cross-sectional area of ​​the third lip (931) is larger than the longitudinal cross-sectional area of ​​the third sealing ring (93), the longitudinal cross-sectional area of ​​the fourth lip (941) is larger than the longitudinal cross-sectional area of ​​the fourth sealing ring (94), and the longitudinal cross-sectional area of ​​the fifth lip (951) is larger than the longitudinal cross-sectional area of ​​the fifth sealing ring (95).

7. A water-proof sealed motor structure according to claim 1 or 6, characterized in that: The sealing ring (9) is made of rubber material; the first sealing ring (91), the second sealing ring (92), the third sealing ring (93), the fourth sealing ring (94) and the fifth sealing ring (95) are all integrally formed on the sealing ring (9); the first lip (911), the second lip (921), the third lip (931), the fourth lip (941) and the fifth lip (951) are respectively integrally formed on the first sealing ring (91), the second sealing ring (92), the third sealing ring (93), the fourth sealing ring (94) and the fifth sealing ring (95).

8. The water-proof sealed motor structure according to claim 1, characterized in that: A groove structure is formed between the inner edge and the outer edge of the water-slinging ring (10), the sealing ring (9) is connected and fixed in the groove structure, and the outer edge of the water-slinging ring (10) is arranged to be inclined outward.

9. The water-proof sealed motor structure according to claim 1, characterized in that: The front end cover (5) is provided with a front bearing (51), and the front end of the motor shaft (4) is rotatably matched with the front end cover (5) through the front bearing (51); the rear end cover (6) is provided with a rear bearing (61), and the rear end of the motor shaft (4) is rotatably matched with the rear end cover (6) through the rear bearing (61).

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