Shaft end protection structure of new energy driven motor

Abstract

The application relates to the technical field of driving motor protection, and discloses a shaft end protection structure of a new energy driving motor, which aims to solve the problems of insufficient protection effect, high cost and complex assembly of the existing shaft end protection structure. The structure is arranged on the outer side of a motor rotating shaft, is located between a motor front end cover and a motor coupling, comprises an outer water blocking ring, an inner water blocking ring and a skeleton oil seal, forms a three-stage protection and a 'three horizontal and three vertical' labyrinth cavity structure, cooperates with high-temperature-resistant grease of an oil storage chamber, and realizes efficient mud and silt invasion prevention. The protection efficiency of the application is more than 98%, the application is convenient to assemble, the cost is controllable, the application is suitable for large-batch matching application, and the service life of the oil seal and the motor can be significantly prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of driving motor protection, in particular to a shaft end protection structure of a new energy driving motor. BACKGROUND

[0002] The permanent magnet synchronous driving motor commonly used in the new energy industry is generally arranged at a position below the vehicle body, and the vertical distance from the shaft end of the motor to the ground is about 40-50 cm. If there is no effective protection structure at the shaft end of the motor, the splashed mud, water and sand will directly accumulate on the output shaft of the motor. After long-term operation and rotation of the motor, the mud and sand will erode the lubricating grease on the oil storage chamber and the oil seal surface, increase the contact force of the oil seal lip, and locally increase the friction between the oil seal lip and the rotating shaft, resulting in damage to the oil seal lip due to dry grinding and loss of the original sealing ability.

[0003] The general protection structure can only block the mud and water from entering the motor to a certain extent, and a small amount of mud and sand will still enter the oil seal lip after the vehicle passes through a relatively rough road, which brings certain potential risks. The high-level protection structure requires separate customization and mold opening of its components, which increases the cost accordingly. Moreover, the assembly process is relatively complex and has poor operability, and the actual motor factory does not have many applications in large quantities to support the vehicle factory. Therefore, there is an urgent need for a shaft end protection structure with good protection effect, controllable cost and convenient assembly to solve the above problems. SUMMARY

[0004] The present application aims to solve the problems of insufficient protection effect, high cost and complex assembly of the existing shaft end protection structure.

[0005] To solve the above problems, the present application provides a shaft end protection structure of a new energy driving motor, which is arranged outside the motor rotating shaft of the driving motor and located between the motor front end cover and the motor coupling of the driving motor, comprising: an outer water blocking ring located outside the motor coupling; an inner water blocking ring fixedly connected with the motor front end cover of the driving motor, the outer water blocking ring is sleeved outside the inner water blocking ring and fixedly connected with the inner water blocking ring; a skeleton oil seal, the motor front end cover is provided with an oil seal cavity, and the skeleton oil seal is arranged in the oil seal cavity; the outer water blocking ring and the motor coupling form a first level of protection, the inner water blocking ring and the motor coupling form a second level of protection, and the inner water blocking ring, the skeleton oil seal and the motor rotating shaft form a third level of protection.

[0006] The shaft end protection structure of the new energy driving motor provided by the present application has the following beneficial effects, but is not limited to the following:

[0007] In view of the problems of insufficient protection effect, high cost and complex assembly of the existing shaft end protection structure, the structure core includes an outer water blocking ring, an inner water blocking ring and a skeleton oil seal, which cooperate with the motor shaft coupling and the motor shaft to form three levels of protection; the first level of protection is formed by the outer water blocking ring and the motor shaft coupling, which blocks most of the splashing impurities; the second level of protection is formed by the inner water blocking ring and the motor shaft coupling, which intercepts fine impurities that penetrate the first level of protection; the third level of protection is formed by the inner water blocking ring, the skeleton oil seal and the motor shaft, which finally blocks residual impurities and protects the motor interior; the three levels of protection are progressive, forming a labyrinth protection, which greatly improves the protection efficiency; and the entire shaft end protection structure assembly can be installed separately after the motor body is assembled, without considering the interference amount control between the parts during assembly, so that the overall assembly is convenient and the cost is controllable, and it is suitable for large-scale supporting applications, which can significantly prolong the service life of the oil seal and the motor.

[0008] Further, the outer water blocking ring is composed of two center-symmetric semicircular rings, and the motor shaft coupling is provided with a ring groove on the outside, and the end of the semicircular ring is located in the ring groove.

[0009] Further, the outer water blocking ring has a Z-shaped cross section, which is integrally formed by an outer first radial ring, an outer axial ring and an outer second radial ring, and the outer first radial ring is located in the ring groove of the motor shaft coupling.

[0010] Further, the inner water blocking ring has a T-shaped cross section, which is integrally formed by an inner axial ring, an inner first radial ring and an inner second radial ring; the outer second radial ring is in contact with the inner second radial ring, the outer axial ring is in contact with the inner axial ring, the inner axial ring is located on the outside of the motor shaft coupling, and the inner first radial ring is located at the end of the motor shaft coupling.

[0011] Further, the side of the skeleton oil seal away from the motor front end cover is provided with an oil storage chamber, and the oil storage chamber is filled with high-temperature-resistant grease.

[0012] Further, the outer second radial ring is provided with a first through hole arranged in an axial array on the normal plane, and the inner second radial ring is provided with a second through hole arranged in an axial array on the normal plane; the first through hole and the second through hole are coaxially aligned, and a bolt is arranged inside for fixing the outer water blocking ring and the inner water blocking ring to one side of the motor front end cover.

[0013] Further, the first labyrinth cavity is formed between the outer first radial ring and the ring groove of the motor shaft coupling, the second labyrinth cavity is formed between the inner axial ring, the inner first radial ring and the motor shaft coupling, and the third labyrinth cavity is formed between the inner first radial ring, the skeleton oil seal and the motor shaft.

[0014] Further, the first labyrinth cavity comprises a first horizontal cavity and a first vertical cavity; the first horizontal cavity is located between the inner ring of the outer layer first radial ring and the inner wall of the ring groove, and the first vertical cavity is located between the inner side of the outer layer first radial ring and the side wall of the ring groove; the second labyrinth cavity comprises a second horizontal cavity and a second vertical cavity; the second horizontal cavity is located between the inner layer axial ring and the motor shaft coupling, and the second vertical cavity is located between the inner layer first radial ring and the end of the motor shaft coupling; the third labyrinth cavity comprises a third horizontal cavity and a third vertical cavity; the third horizontal cavity is located between the inner layer first radial ring and the motor rotating shaft, and the third vertical cavity is located between the inner layer first radial ring and the skeleton oil seal.

[0015] Further, the abutting surfaces of the two semicircular rings are provided with positioning pins and positioning holes in interference fit to ensure accurate abutment of the semicircular rings.

[0016] Further, the outer layer water retaining ring and the inner layer water retaining ring are both made of aluminum alloy material. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a sectional view of the shaft end protection structure of the new energy driven motor according to an embodiment of the application;

[0018] Figure 2 is an exploded view of the shaft end protection structure of the new energy driven motor according to an embodiment of the application;

[0019] Figure 3 is a first perspective view of the semicircular ring in the shaft end protection structure of the new energy driven motor according to an embodiment of the application;

[0020] Figure 4 is a second perspective view of the semicircular ring in the shaft end protection structure of the new energy driven motor according to an embodiment of the application;

[0021] Figure 5 is a second perspective view of the inner layer water retaining ring in the shaft end protection structure of the new energy driven motor according to an embodiment of the application;

[0022] Figure 6 is a second perspective view of the inner layer water retaining ring in the shaft end protection structure of the new energy driven motor according to an embodiment of the application.

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 1, outer water retaining ring; 11, semicircular ring; 101, outer first radial ring; 102, outer axial ring; 103, outer second radial ring; 104, first through hole; 2, inner water retaining ring; 201, inner axial ring; 202, inner first radial ring; 203, inner second radial ring; 204, second through hole; 3, skeleton oil seal; 31, oil storage chamber; 4, bolt; 5, motor front end cover; 6, motor rotating shaft; 7, motor coupling; 8, first labyrinth cavity; 801, first horizontal cavity; 802, first vertical cavity; 9, second labyrinth cavity; 901, second horizontal cavity; 902, second vertical cavity; 10, third labyrinth cavity; 1001, third horizontal cavity; 1002, third vertical cavity. DETAILED DESCRIPTION

[0025] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings which show the embodiments according to the present application. It should be understood that the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments described in the present application, all other embodiments obtained by those skilled in the art without creative effort shall fall within the scope of protection of the present application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application; the use of the terms "include," "include," "have," "have," "contain," "contain" and the like in the description and the claims of the specification and the above description of drawings are open-ended terms. Therefore, a method or device "including" one or more steps or elements has one or more steps or elements, but is not limited to only having the one or more elements. The terms "first", "second" and the like in the specification and claims of the specification or the above description of drawings are used to distinguish different objects, but are not used to describe a particular order or primary and secondary relationship. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise stated, the meaning of "multiple" is two or more.

[0027] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements 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.

[0028] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "attaching" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] It should be emphasized that when the term "comprising / including" is used in the present specification, it is used to explicitly indicate the presence of the features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps, components or groups of features, integers, steps, components.

[0030] The term "and / or" in the present application is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0031] Referring to Figures 1-6 A shaft end protection structure of a new energy driving motor according to an embodiment of the present application is arranged outside a motor shaft 6 of the driving motor and located between a motor front end cover 5 and a motor shaft coupling 7 of the driving motor, and comprises: an outer water blocking ring 1 located outside the motor shaft coupling 7; an inner water blocking ring 2 fixedly connected with the motor front end cover 5 of the driving motor, the outer water blocking ring 1 is sleeved outside the inner water blocking ring 2 and fixedly connected with the inner water blocking ring 2; a skeleton oil seal 3, the motor front end cover 5 is provided with an oil seal cavity, and the skeleton oil seal 3 is arranged in the oil seal cavity; the outer water blocking ring 1 and the motor shaft coupling 7 form a first level protection, the inner water blocking ring 2 and the motor shaft coupling 7 form a second level protection, and the inner water blocking ring 2, the skeleton oil seal 3 and the motor shaft 6 form a third level protection.

[0032] The structure core includes an outer water blocking ring 1, an inner water blocking ring 2 and a skeleton oil seal 3, which cooperate with a motor shaft coupling 7 and a motor rotating shaft 6 to form three levels of protection. The first level of protection is formed by the outer water blocking ring 1 and the motor shaft coupling 7, which blocks most of the splashing impurities. The second level of protection is formed by the inner water blocking ring 2 and the motor shaft coupling 7, which intercepts the fine impurities that penetrate the first level of protection. The third level of protection is formed by the inner water blocking ring 2, the skeleton oil seal 3 and the motor rotating shaft 6, which finally blocks the residual impurities and protects the motor interior. The three levels of protection are progressive, forming a labyrinth protection, which greatly improves the protection efficiency. Moreover, the entire shaft end protection structure assembly can be installed separately after the motor body is assembled, without considering the interference amount control between the parts during assembly. The overall assembly is convenient and the cost is controllable, which is suitable for large-scale matching applications and can significantly prolong the service life of the oil seal and the motor.

[0033] Optionally, please refer to Figure 2 , Figure 3 and Figure 4 , the outer water blocking ring 1 is composed of two center-symmetric semicircular rings 11, and the motor shaft coupling 7 is provided with a ring groove on the outer side, and the end of the semicircular ring 11 is located in the ring groove.

[0034] In this embodiment, the ring groove is formed on the outer side of the motor shaft coupling 7 by turning, and the two semicircular rings 11 are spliced without being integrally sleeved on the motor shaft coupling 7, which can be installed after the motor body is assembled. Moreover, the end of the semicircular ring 11 is embedded in the ring groove to form the first barrier of the first level of protection, which can block the horizontally splashing impurities.

[0035] Optionally, please refer to Figure 2 , Figure 5 and Figure 6 , the outer water blocking ring 1 has a Z-shaped cross section, which is integrally formed by an outer first radial ring 101, an outer axial ring 102 and an outer second radial ring 103, and the outer first radial ring 101 is located in the ring groove of the motor shaft coupling 7.

[0036] In this embodiment, the outer water blocking ring 1 is integrally forged into a Z-shaped structure with the outer first radial ring 101, the outer axial ring 102 and the outer second radial ring 103, and is attached to the inner water blocking ring 2. Moreover, the outer first radial ring 101 of the outer water blocking ring 1 is embedded in the ring groove of the motor shaft coupling 7, so that a U-shaped protection cavity is formed between the outer first radial ring 101 and the ring groove, effectively prolonging the impurity invasion path.

[0037] Optionally, please refer to Figure 2 , Figure 3 and Figure 4, the inner layer water retaining ring 2 is integrally formed by the inner layer axial ring 201, the inner layer first radial ring 202 and the inner layer second radial ring 203; the outer layer second radial ring 103 is attached to the inner layer second radial ring 203, the outer layer axial ring 102 is attached to the inner layer axial ring 201, and the inner layer axial ring 201 is located outside the motor shaft coupling 7, and the inner layer first radial ring 202 is located at the end of the motor shaft coupling 7.

[0038] In the embodiment, the inner layer water retaining ring 2 is integrally formed by the inner layer axial ring 201, the inner layer first radial ring 202 and the inner layer second radial ring 203; the outer layer second radial ring 103 is attached to the inner layer second radial ring 203, the outer layer axial ring 102 is attached to the inner layer axial ring 201, and the inner layer axial ring 201 is located outside the motor shaft coupling 7, and the inner layer first radial ring 202 is located at the end of the motor shaft coupling 7.

[0039] Optionally, please refer to Figure 1 , the skeleton oil seal 3 is provided with an oil storage chamber 31 away from the motor front end cover 5, and the oil storage chamber 31 is filled with high-temperature-resistant grease.

[0040] In the embodiment, the skeleton oil seal 3 is provided with an oil storage chamber 31 away from the motor front end cover 5, and the oil storage chamber 31 is filled with high-temperature-resistant grease.

[0041] Optionally, please refer to Figure 2 、 Figure 4 and Figure 6 , the outer layer second radial ring 103 is provided with a first through hole 104 arranged in an axial array on the normal plane, and the inner layer second radial ring 203 is provided with a second through hole 204 arranged in an axial array on the normal plane; the first through hole 104 and the second through hole 204 are coaxially aligned, and a bolt 4 is arranged inside, for fixing the outer layer water retaining ring 1 and the inner layer water retaining ring 2 to one side of the motor front end cover 5.

[0042] In the embodiment, the outer layer second radial ring 103 is provided with four M8 threaded holes (the first through hole 104), and the inner layer second radial ring 203 is provided with four 8.5mm light hole (second through hole 204), both coaxial alignment, through M8x25 stainless steel bolt 4, with flat washer, spring washer, tighten, through bolt 4 connection to ensure that the outer layer of the water retaining ring 1 and the inner layer of the water retaining ring 2 are fixed firmly, no relative displacement of the fitting surface; flat washer increases the stress area, spring washer prevents bolt 4 loosening caused by vibration, ensures the connection stability in long-term use, this kind of installation method makes the outer layer of the water retaining ring 1 and the inner layer of the water retaining ring 2 can be directly connected with the motor body through the bolt 4, convenient assembly, higher applicability.

[0043] Optionally, please refer to Figure 1 、 Figure 3 and Figure 5 , the outer layer first radial ring 101 and the ring groove of the motor shaft coupling 7 form a first labyrinth cavity 8, the inner layer axial ring 201, the inner layer first radial ring 202 and the motor shaft coupling 7 form a second labyrinth cavity 9, the inner layer first radial ring 202 and the skeleton oil seal 3 form a third labyrinth cavity 10 between the motor shaft 6.

[0044] In this embodiment, when impurities enter the labyrinth cavity, they need to move along the tortuous path, and in the process, they are settled due to gravity or cannot move forward due to path obstruction, and finally are intercepted in the cavity, cannot touch the skeleton oil seal 3, the complex path of the labyrinth cavity makes the impurity invasion path lengthened by 3 times, the interception rate improved by 50%, the impurity adhesion amount of the oil seal lip reduced by 90% compared with no labyrinth cavity structure, and the use effect is better.

[0045] Optionally, please refer to Figure 1 、 Figure 3 and Figure 5 , the first labyrinth cavity 8 includes a first horizontal cavity 801 and a first vertical cavity 802; the first horizontal cavity 801 is located between the inner ring of the outer layer first radial ring 101 and the inner wall of the ring groove, and the first vertical cavity 802 is located between the inner side of the outer layer first radial ring 101 and the side wall of the ring groove; the second labyrinth cavity 9 includes a second horizontal cavity 901 and a second vertical cavity 902; the second horizontal cavity 901 is located between the inner layer axial ring 201 and the motor shaft coupling 7, and the second vertical cavity 902 is located between the inner layer first radial ring 202 and the end of the motor shaft coupling 7; the third labyrinth cavity 10 includes a third horizontal cavity 1001 and a third vertical cavity 1002; the third horizontal cavity 1001 is located between the inner layer first radial ring 202 and the motor shaft 6, and the third vertical cavity 1002 is located between the inner layer first radial ring 202 and the skeleton oil seal 3.

[0046] In this embodiment, the first horizontal cavity 801 is an annular gap (1 mm) between the inner ring of the outer first radial ring 101 and the inner wall of the ring groove, and the first vertical cavity 802 is an axial gap (1.5 mm) between the inner side of the outer first radial ring 101 and the side wall of the ring groove, which are vertically connected to form an L-shaped channel. After the impurities in the horizontal direction enter the first horizontal cavity 801, they need to turn into the first vertical cavity 802 to continue to invade, and are intercepted due to kinetic energy loss and gravity settlement during the turning process; the second horizontal cavity 901 is an annular gap (1 mm) between the inner axial ring 201 and the motor shaft coupling 7, and the second vertical cavity 902 is an axial gap (1.5 mm) between the inner first radial ring 202 and the end of the motor shaft coupling 7, forming a secondary L-shaped channel. After the small impurities that penetrate the first level of protection enter the second horizontal cavity 901, they need to turn again into the second vertical cavity 902, further losing kinetic energy, and being blocked by the fitting surface of the inner water retaining ring 2; the interception rate of the second level of protection is 90%, and only 10% of the trace impurities can enter the third level of protection area; the third horizontal cavity 1001 is an annular gap (0.8 mm) between the inner first radial ring 202 and the motor shaft 6, and the third vertical cavity 1002 is an axial gap (1 mm) between the inner first radial ring 202 and the skeleton oil seal 3, forming a final L-shaped channel. After the residual trace impurities enter the third horizontal cavity 1001, they cannot advance due to the narrow gap and winding path, and are blocked by the lip of the skeleton oil seal 3, and finally cannot enter the motor interior; the interception rate of the third level of protection is 99%, the impurity content that finally touches the oil seal lip is ≤0.1%, and the oil seal failure risk is reduced by 98%. The structure assembly forms a "three horizontal and three vertical" labyrinth groove type protection structure with three levels of protection through the outer water retaining ring 1, the inner water retaining ring 2, the skeleton oil seal 3, and the motor shaft coupling 7 and the motor shaft 6 on the driving motor body, effectively preventing dust, sand, and water from entering the motor interior, and greatly improving the motor shaft end protection capability.

[0047] Optionally, the abutting surfaces of the two half circular rings 11 are provided with positioning pins and positioning holes, and the positioning pins and the positioning holes are in interference fit, which is used to ensure the accurate abutment of the half circular rings 11.

[0048] In this embodiment, two positioning holes (diameter 8 mm, tolerance H7) are drilled in the abutting surfaces of the two half circular rings 11, and 45 steel positioning pins (interference amount 0.02-0.03 mm) are press-fitted. The interference fit of the positioning pins and the positioning holes realizes the accurate abutment of the half circular rings 11, avoids the gap on the abutting surfaces, ensures the uniformity of the fitting gap between the outer first radial ring 101 and the ring groove, and has better use effect.

[0049] Optionally, the outer water retaining ring 1 and the inner water retaining ring 2 are made of aluminum alloy material.

[0050] In the embodiment, the outer water retaining ring 1 and the inner water retaining ring 2 are integrally formed by aluminum alloy forging, the good forging performance of the aluminum alloy ensures that the structure is dense and defect-free, the good ductility of the steel plate ensures that there is no crack after forming, the rigidity and fatigue resistance of the aluminum alloy make the outer water retaining ring 1 and the inner water retaining ring 2 not deformed during long-term use, and the natural corrosion resistance of the aluminum alloy makes the service life of the outer water retaining ring 1 and the inner water retaining ring 2 reach more than 10 years in a humid and muddy environment, without additional rust prevention treatment, and the maintenance cost is reduced.

[0051] Although the present application is disclosed as above, the protection scope of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications shall fall within the protection scope of the present application.

Claims

1. A shaft end protection structure for a new energy drive motor, disposed on the outside of the motor shaft (6) of the drive motor, and located between the motor front end cover (5) and the motor coupling (7) of the drive motor, characterized in that, include: The outer water-blocking ring (1) is located on the outside of the motor coupling (7). The outer water-blocking ring (1) is composed of two semi-circular rings (11) that are symmetrical about each other. The motor coupling (7) has an annular groove on its outside. The end of the semi-circular ring (11) is located in the annular groove. The axial section of the outer water-blocking ring (1) is Z-shaped. It is integrally formed by the outer first radial ring (101), the outer axial ring (102), and the outer second radial ring (103). The outer first radial ring (101) is located in the annular groove of the motor coupling (7). The inner water-blocking ring (2) is fixedly connected to the front end cover (5) of the drive motor. The outer water-blocking ring (1) is sleeved on the outside of the inner water-blocking ring (2) and fixedly connected to the inner water-blocking ring (2). The axial section of the inner water-blocking ring (2) is T-shaped and is integrally formed by the inner axial ring (201), the inner first radial ring (202) and the inner second radial ring (203). The outer second radial ring (103) is in contact with the inner second radial ring (203), the outer axial ring (102) is in contact with the inner axial ring (201), the inner axial ring (201) is located on the outside of the motor coupling (7), and the inner first radial ring (202) is located at the end of the motor coupling (7). The skeleton oil seal (3) is provided in the oil seal cavity of the front end cover (5) of the motor; The outer water-blocking ring (1) and the motor coupling (7) constitute a first-level protection, the inner water-blocking ring (2) and the motor coupling (7) constitute a second-level protection, and the inner water-blocking ring (2), the skeleton oil seal (3) and the motor shaft (6) constitute a third-level protection.

2. The shaft end protection structure of a new energy drive motor according to claim 1, characterized in that, The skeleton oil seal (3) has an oil storage chamber (31) on the side away from the front end cover (5) of the motor, and the oil storage chamber (31) is filled with high temperature resistant grease.

3. The shaft end protection structure of a new energy drive motor according to claim 1, characterized in that, The outer second radial ring (103) has a first through hole (104) arranged in an axial array on its normal plane, and the inner second radial ring (203) has a second through hole (204) arranged in an axial array on its normal plane; the first through hole (104) and the second through hole (204) are coaxially aligned, and bolts (4) are provided inside for fixing the outer water baffle ring (1) and the inner water baffle ring (2) to one side of the motor front end cover (5).

4. The shaft end protection structure of a new energy drive motor according to claim 3, characterized in that, The outer first radial ring (101) and the annular groove of the motor coupling (7) form a first labyrinth cavity (8), the inner axial ring (201), the inner first radial ring (202) and the motor coupling (7) form a second labyrinth cavity (9), and the inner first radial ring (202), the skeleton oil seal (3) and the motor shaft (6) form a third labyrinth cavity (10).

5. The shaft end protection structure of a new energy drive motor according to claim 4, characterized in that, The first labyrinth cavity (8) includes a first transverse cavity (801) and a first longitudinal cavity (802); the first transverse cavity (801) is located between the inner ring of the outer first radial ring (101) and the inner wall of the annular groove, and the first longitudinal cavity (802) is located between the inner side of the outer first radial ring (101) and the side wall of the annular groove; the second labyrinth cavity (9) includes a second transverse cavity (901) and a second longitudinal cavity (902); the second transverse cavity (901) is located between the inner axial ring (201) and the inner axial ring (202). The second longitudinal cavity (902) is located between the inner first radial ring (202) and the end of the motor coupling (7); the third labyrinth cavity (10) includes a third transverse cavity (1001) and a third longitudinal cavity (1002); the third transverse cavity (1001) is located between the inner first radial ring (202) and the motor shaft (6), and the third longitudinal cavity (1002) is located between the inner first radial ring (202) and the skeleton oil seal (3).

6. The shaft end protection structure of a new energy drive motor according to claim 1, characterized in that, The mating surfaces of the two semicircular rings (11) are provided with locating pins and locating holes. The locating pins and locating holes are interference-fitted to ensure that the semicircular rings (11) are accurately mated.

7. The shaft end protection structure of a new energy drive motor according to claim 1, characterized in that, Both the outer water-blocking ring (1) and the inner water-blocking ring (2) are made of aluminum alloy.

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