A mechanical sealing structure and a reduction-type wheel-side electric drive system

Abstract

The present invention relates to a mechanical sealing structure and a reduction wheel-side electric drive system. The reduction wheel-side electric drive system includes a wheel-side motor, a wheel-side reduction mechanism, an integrated housing, a rotating bracket, a hub bearing, and a rim structure. The mechanical sealing structure is arranged between the integrated housing and the rotating bracket, and includes a mechanical sealing threaded ring and a mechanical sealing labyrinth ring. The mechanical sealing labyrinth ring and the mechanical sealing threaded ring cooperate with each other. The mechanical sealing threaded ring and the integrated housing are fixedly connected by threads. The mechanical sealing labyrinth ring and the rotating bracket are fixedly connected by bolts. Compared with the prior art, the present invention adopts a form in which a mechanical sealing threaded ring and a mechanical sealing labyrinth ring cooperate with each other. The rigidity of the components is high and not easy to deform. The connection method adopts a detachable threaded ring or bolt connection and is insensitive to temperature rise. It has the advantages of impact resistance, temperature rise resistance, high rigidity, not easy to deform, manufacturing-friendly, easy to disassemble and assemble, reinstallable, and low cost.

Description

Technical Field

[0001] The present invention relates to the field of electric vehicle chassis and transmission, and in particular to a mechanical sealing structure and a reduction-type wheel-side electric drive system. Background Art

[0002] In recent years, as "carbon neutrality" has become a global consensus and new energy vehicle technology has advanced to a new stage of development in response to global climate change, in-wheel electric vehicles have garnered increasing attention. In-wheel electric drive systems typically utilize in-wheel motors as their power source, which independently drive the wheels after torque is increased through in-wheel reducers. Compared to traditional centralized electric drive systems, reduced-speed in-wheel electric drive systems omit transmission devices such as differentials, universal joints, and drive axles, resulting in a simpler structure and more efficient transmission.

[0003] The power system of a reduction-type wheel-mounted electric drive system is located close to the ground, making it inevitably exposed to dust and sand. The wheel-mounted reducer operates in an oil-lubricated wet cavity. Without proper sealing, dust and even foreign matter can enter the wet cavity, potentially causing failure of the reducer or even the wheel-mounted motor.

[0004] Traditional contact oil seals require high machining accuracy for the surface of parts to achieve a good sealing effect, and usually require precision turning or even grinding of the outer circle. In addition, the diameter of the sealing position of the reduction wheel-side electric drive system is relatively large (close to the size of the outer diameter of the rim), which places stringent requirements on process equipment and high production costs. In addition, the sealing position of the reduction wheel-side electric drive system is frequently impacted by the up and down bumps of the wheel. Such working conditions are quite unfavorable to the contact area between the traditional oil seal and the high-speed rotating parts, which may cause local high friction and temperature rise, and even cause deformation and damage to the oil seal. Therefore, it is necessary to develop a sealing technology solution suitable for the reduction wheel-side electric drive system that is impact-resistant, temperature-resistant, and cost-controlled. Summary of the Invention

[0005] The purpose of the present invention is to provide a mechanical sealing structure and a reduction wheel electric drive system in order to overcome the defects of the above-mentioned prior art.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] According to a first aspect of the present invention, a mechanical sealing structure is provided, which is suitable for a reduction-type wheel-side electric drive system, wherein the reduction-type wheel-side electric drive system comprises a wheel-side motor, a wheel-side reduction mechanism, an integrated housing, a rotating bracket, a wheel hub bearing and a rim structure; the wheel-side motor is fixedly connected to the integrated housing, the wheel-side reduction mechanism is installed in the integrated housing, the input end of the wheel-side reduction mechanism is connected to the wheel-side motor, and the output end is connected to the rotating bracket, the rotating bracket is fixedly connected to the wheel hub bearing, and the wheel hub bearing is fixedly connected to the rim structure;

[0008] The mechanical sealing structure is arranged between the integrated housing and the rotating bracket, and includes a mechanical sealing threaded ring and a mechanical sealing labyrinth ring, wherein the mechanical sealing labyrinth ring and the mechanical sealing threaded ring cooperate with each other;

[0009] The mechanical sealing threaded ring is fixedly connected to the integrated housing by threads, with its inner end surface close to the wheel side reduction mechanism and its outer end surface away from the wheel side reduction mechanism;

[0010] The mechanical sealing labyrinth ring is fixedly connected to the rotating bracket by bolts, the inner end surface of the mechanical sealing labyrinth ring is close to one side of the wheel side reduction mechanism, and the outer end surface of the mechanical sealing labyrinth ring is far away from one side of the wheel side reduction mechanism.

[0011] Preferably, the mechanical sealing threaded ring is an annular structure, the outer side of which is provided with a thread adapted to the integrated housing, and the inner side of which is provided with a staggered fin structure;

[0012] The mechanical sealing labyrinth ring is an annular structure, the outer side of which cooperates with the staggered fin structure, and the end surface of which is provided with a bolt mounting hole adapted to the rotating bracket.

[0013] Preferably, the mechanical sealing threaded ring is clearance-matched with the mechanical sealing labyrinth ring;

[0014] The staggered fin structure includes a plurality of fins arranged in parallel, each of the fins being annular with an outer diameter matching an inner diameter of a mechanical sealing thread ring and being coaxial with the mechanical sealing thread ring. The fins are divided into a first fin and a second fin. The first fins are in plurality and are arranged on a side close to the wheel-side reduction mechanism, and the second fins are in plurality and are arranged on a side far from the wheel-side reduction mechanism. The length of the first fin is greater than that of the second fin, and the first fin on the side closest to the wheel-side reduction mechanism and the second fin on the side farthest from the wheel-side reduction mechanism are flush with the inner end surface and the outer end surface of the mechanical sealing thread ring.

[0015] The outer side surface of the mechanical sealing labyrinth ring is provided with a first annular structure with a stepped cross-section. The first vertical surface of the first annular structure is the inner end surface of the mechanical sealing labyrinth ring. The first step surface of the first annular structure cooperates with multiple first fins. The second vertical surface of the first annular structure cooperates with the first fin closest to the second fin. The second step surface of the first annular structure cooperates with multiple second fins.

[0016] Preferably, the plurality of first fins of the staggered fin structure are arranged at equal intervals, and the plurality of second fins of the staggered fin structure are arranged at equal intervals.

[0017] Preferably, the multiple fins of the staggered fin structure are arranged at equal intervals.

[0018] Preferably, the number of the first fins is the same as the number of the second fins.

[0019] Preferably, the outer end surface of the mechanical sealing threaded ring is provided with a recessed groove;

[0020] The outer side of the mechanical seal labyrinth ring is further provided with a radially raised feature structure and an axially raised feature structure, which form a second annular structure with an L-shaped cross section, and the second annular structure is arranged radially outside the first annular structure;

[0021] The radially raised characteristic structure is connected to the second step surface, and the radially raised characteristic structure cooperates with the inner outer end surface of the mechanical sealing threaded ring. The outer end surface between the sink groove and the inner side surface of the mechanical sealing labyrinth ring is the inner outer end surface of the mechanical sealing threaded ring.

[0022] The size of the axially raised feature structure is adapted to the size of the recess.

[0023] Preferably, there are multiple bolt mounting holes, which are evenly arranged on the end surface of the mechanical sealing labyrinth ring.

[0024] Preferably, the outer end surface of the mechanical sealing threaded ring is provided with two end surface characteristic groove structures.

[0025] According to the second aspect of the present invention, there is provided a wheel-side electric drive system suitable for reduction type, comprising a wheel-side motor, a wheel-side reduction mechanism, an integrated housing, a rotating bracket, a hub bearing and a rim structure, wherein a mechanical sealing structure as described in the first aspect of the present invention is arranged between the integrated housing and the rotating bracket.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The mechanical sealing threaded ring and the mechanical sealing labyrinth ring are matched together. The rigidity of the parts is high and not easy to deform. The connection method adopts a detachable threaded ring or bolt connection, and is not sensitive to temperature rise. Therefore, the mechanical sealing structure has the advantages of impact resistance, temperature rise resistance, high rigidity, not easy to deform, manufacturing-friendly, easy to disassemble and assemble, can be reassembled, and low cost.

[0028] (2) The inner side of the mechanical seal thread ring is provided with an interlaced fin structure, which is in clearance fit with the mechanical seal labyrinth ring. When the wheel rotates, an air pressure difference is generated between the interlaced fin structure of the mechanical seal thread ring and the mechanical seal labyrinth ring, so that the pressure in the wet cavity is higher than the external air pressure, thereby preventing liquid or gas impurities from entering the wet cavity by means of air pressure barrier. The mechanical seal labyrinth ring is provided with radial convex features and axial convex features, which form a 90° angle between the two, thereby preventing foreign matter or larger monomers from entering the wet cavity by means of physical barrier. In summary, the mechanical seal structure achieves the desired sealing effect through the dual barrier methods of physical barrier and air pressure barrier. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the layout of the reduction wheel electric drive system and mechanical seal structure;

[0030] Figure 2 Schematic diagram of the connection between the mechanical seal structure, the rotating bracket, the hub bearing and the rim structure in an embodiment of the present invention;

[0031] Figure 3 Schematic diagram of the connection between the rotating bracket, the wheel-side reduction mechanism, the integrated housing, the wheel-side motor, and the rotating bracket in an embodiment of the present invention;

[0032] Figure 4 Schematic diagram of the connection between the mechanical sealing threaded ring and the mechanical sealing labyrinth ring in an embodiment of the present invention;

[0033] Figure 5 This is a three-dimensional schematic diagram of the front of the mechanical seal thread ring;

[0034] Figure 6 It is a three-dimensional schematic diagram of the back side of the mechanical seal thread ring;

[0035] Figure 7 This is a three-dimensional schematic diagram of the front of the mechanical seal labyrinth;

[0036] Figure 8 This is a three-dimensional schematic diagram of the back side of the mechanical seal labyrinth;

[0037] Reference numerals: 1, wheel-side motor; 2, wheel-side reduction mechanism; 3, integrated housing; 4, mechanical sealing structure; 5, rotating bracket; 6, wheel hub bearing; 7, wheel rim structure; 8, wheel; 9, bolt;

[0038] 21. Ring gear of wheel reduction mechanism;

[0039] 41. Mechanical sealing thread ring; 411. Staggered fin structure; 412. External thread; 413. End face characteristic groove structure; 414. Sink;

[0040] 42. Mechanical sealing labyrinth; 421. Radial protrusion feature structure; 422. Axial protrusion feature structure; 423. Bolt mounting hole. DETAILED DESCRIPTION

[0041] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operating process. Obviously, the described embodiment is only an embodiment of a part of the present invention, not all embodiments, and the protection scope of the present invention is not limited to the following embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0042] In the drawings, components with identical structures are denoted by the same reference numerals, and components with similar structures or functions are denoted by similar reference numerals. The dimensions and thicknesses of each component shown in the drawings are arbitrary and are not limited by the present invention. To enhance clarity and illustrate the coordination between components, some components in the drawings are scaled, and the distances between components are increased or decreased.

[0043] In the description of the embodiments of the present application, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the application is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present application 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 should not be understood as a limitation on the present application.

[0044] Furthermore, the terms “first,” “second,” “third,” etc., are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0045] In the description of the embodiments of the present application, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0046] The present invention provides a mechanical seal structure 4 suitable for a reduction-type wheel-side electric drive system. The reduction-type wheel-side electric drive system includes a wheel-side motor 1, a wheel-side reduction mechanism 2, an integrated housing 3, a rotating bracket 5, a hub bearing 6, and a rim structure 7. The wheel-side motor 1 is fixedly connected to the integrated housing 3, the wheel-side reduction mechanism 2 is mounted within the integrated housing 3, the input end of the wheel-side reduction mechanism 2 is connected to the wheel-side motor 1, and the output end is connected to the rotating bracket 5. The rotating bracket 5 is fixedly connected to the hub bearing 6, and the hub bearing 6 is fixedly connected to the rim structure 7. Figure 1 As shown, the mechanical sealing structure 4 provided in the present application is arranged between the integrated shell 3 and the rotating bracket 5, and the mechanical sealing structure 4 includes a mechanical sealing threaded ring 41 and a mechanical sealing labyrinth ring 42, and the mechanical sealing labyrinth ring 42 cooperates with the mechanical sealing threaded ring 41; the mechanical sealing threaded ring 41 is fixedly connected to the integrated shell 3 by a thread, and its inner end face is close to the side of the wheel-side reduction mechanism 2, and its outer end face is away from the side of the wheel-side reduction mechanism 2; the mechanical sealing labyrinth ring 42 is fixedly connected to the rotating bracket 5 by a bolt 9, and its inner end face is close to the side of the wheel-side reduction mechanism 2, and its outer end face is away from the side of the wheel-side reduction mechanism 2.

[0047] During the driving process, the wheel-side motor 1 serves as the power source. The power is decelerated and torque-increased by the wheel-side reduction mechanism 2, and then drives the rotating bracket 5. The rotating bracket 5 drives the hub bearing 6, and finally drives the wheel 8 through the rim structure 7. In the above operation process, Figure 1 As shown, the mechanical sealing structure 4 is provided between the integrated housing 3 and the rotating bracket 5, and plays a sealing role on the wet cavity in the integrated housing 3. Figure 3 As shown, in the embodiment of the present application, the wheel-side reduction mechanism 2 adopts gear transmission, and its output element is the ring gear 21, which drives the rotating bracket 5 to rotate at high speed. In fact, the function of the reduction transmission can be realized in many forms and is not limited to gear transmission. The specific forms of the wheel-side reduction mechanism 2 include but are not limited to gear transmission, belt transmission, chain transmission and other reduction transmission methods. Any device that can realize the reduction transmission function at this position is within the scope of protection of this application.

[0048] The mechanical seal structure 4 is composed of two parts: a mechanical seal threaded ring 41 and a mechanical seal labyrinth ring 42. The mechanical seal labyrinth ring 42 is fixedly connected to the rotating bracket 5 by bolts 9, and rotates at high speed along with the rotating bracket 5 during operation. The outer side of the mechanical seal threaded ring 41 is provided with a thread, which is fixedly connected to the integrated housing 3 through the thread. The mechanical seal threaded ring 41 does not rotate during operation. In the embodiment of the present application, Figure 2 As shown, the mechanical sealing threaded ring 41 is combined with the mechanical sealing labyrinth ring 42 , and the mechanical sealing labyrinth ring 42 is connected to the rotating bracket 5 through the bolt 9 , thereby driving the hub bearing 6 and the rim structure 7 to rotate.

[0049] Among them, the mechanical sealing threaded ring 41 is an annular structure, which can be approximately regarded as a cylindrical shell with a small axial length. Its outer side is provided with a thread 412 that is compatible with the integrated shell 3, and its inner side is provided with a staggered fin structure 411; the mechanical sealing labyrinth ring 42 is an annular structure, its outer side is matched with the staggered fin structure 411, and its end face is provided with a bolt mounting hole 423 that is compatible with the rotating bracket 5.

[0050] The mechanical sealing structure 4 provided in the present application is installed in the sealing position of the large diameter of the wheel rim. The diameter is large (close to the size of the outer diameter of the rim) and is frequently impacted by the up and down bumps of the wheel 8. For traditional rubber sealing rings, such working conditions are relatively harsh on the contact area of ​​high-speed rotating parts, which may cause local high friction and temperature rise, and even cause deformation, damage or leakage failure of the rubber sealing ring. The invention provides a mechanical sealing structure 4 suitable for a reduction-type wheel-rim electric drive system, which adopts a mechanical sealing threaded ring 41 and a mechanical sealing labyrinth ring 42. The rigidity of the components is high and not easy to deform. The connection method adopts a detachable threaded ring or bolt connection, and is not sensitive to temperature rise. Therefore, the mechanical sealing structure 4 has the advantages of impact resistance, temperature rise resistance, high rigidity, not easy to deform, manufacturing-friendly, easy to disassemble and assemble, can be reassembled, and low cost.

[0051] Specifically, the mechanical sealing threaded ring 41 and the mechanical sealing labyrinth ring 42 are clearance-matched; Figure 4 、 Figure 5 、 Figure 6As shown, the staggered fin structure 411 includes a plurality of fins arranged in parallel, the fins are annular with an outer diameter matching the inner diameter of the mechanical sealing thread ring 41, and are coaxial with the mechanical sealing thread ring 41. The fins are divided into first fins and second fins. The number of the first fins is multiple and they are arranged on the side close to the wheel-side reduction mechanism 2, and the number of the second fins is multiple and they are arranged on the side away from the wheel-side reduction mechanism 2. The length of the first fin is greater than that of the second fin, and the first fin on the side closest to the wheel-side reduction mechanism 2 and the second fin on the side farthest from the wheel-side reduction mechanism 2 are flush with the inner end face and the outer end face of the mechanical sealing thread ring 41; as shown Figure 4 、 Figure 7 、 Figure 8 As shown, the outer side surface of the mechanical sealing labyrinth ring 42 is provided with a first annular structure with a stepped cross-section, the first vertical surface of the first annular structure is the inner end surface of the mechanical sealing labyrinth ring 42, the first step surface of the first annular structure cooperates with multiple first fins, the second vertical surface of the first annular structure cooperates with the first fin closest to the second fin, and the second step surface of the first annular structure cooperates with multiple second fins.

[0052] like Figure 4-8 As shown, the outer end face of the mechanical sealing threaded ring 41 is provided with a recessed groove 414, which is an annular groove; the outer side face of the mechanical sealing labyrinth ring 42 is also provided with a radially raised feature structure and an axially raised feature structure, and the radially raised feature structure and the axially raised feature structure 422 form a second annular structure with an L-shaped cross-section, and the second annular structure is arranged radially outside the first annular structure; the radially raised feature structure 421 is connected to the second step surface, and the radially raised feature structure 421 is matched with the inner outer end face of the mechanical sealing threaded ring 41, and the outer end face between the recessed groove 414 and the inner side face of the mechanical sealing labyrinth ring 42 is the inner outer end face of the mechanical sealing threaded ring 41; the size of the axially raised feature structure 422 is adapted to the size of the recessed groove 414; the recessed groove 414 and the radially raised feature 421 and the axially raised feature 422 of the mechanical sealing labyrinth ring 42 achieve a slight clearance fit.

[0053] The inner side of the mechanical seal threaded ring is provided with an interlaced fin structure 411, which is clearance-fitted with the mechanical seal labyrinth ring 42. When the wheel 8 rotates, an air pressure difference is generated between the interlaced fin structure 411 of the mechanical seal threaded ring and the mechanical seal labyrinth ring 42, causing the pressure in the wet chamber to be higher than the external air pressure, thereby preventing liquid or gaseous impurities from entering the wet chamber through air pressure barrier. The mechanical seal labyrinth ring 42 is provided with radial and axial raised features, which form a 90° angle between them, to prevent foreign objects or larger monomers from entering the wet chamber through physical barrier. In summary, the mechanical seal structure 4 achieves the desired sealing effect through the dual barrier methods of physical barrier and air pressure barrier.

[0054] In the embodiment of the present application, the multiple fins of the staggered fin structure 411 are arranged at equal intervals, and the number of the first fins is the same as the number of the second fins. In other embodiments, the multiple first fins of the staggered fin structure 411 can also be arranged at equal intervals, and the multiple second fins of the staggered fin structure 411 can also be arranged at equal intervals, and the number of the first fins and the second fins is not limited. Specifically, Figure 4 、 Figure 5 、 Figure 6 The staggered fin structure 411 shown is schematic. Its specific dimensions, staggering, and arrangement should be determined based on actual gaps and expected pressure differentials, through theoretical calculations and simulation analysis, and then verified through relevant testing to achieve the desired sealing effect. Any structure that can achieve pressure isolation in this location is within the scope of protection of this application.

[0055] There are multiple bolt mounting holes 423, which are evenly arranged on the end face of the mechanical sealing labyrinth ring 42 so as to connect the mechanical sealing labyrinth ring 42 with the rotating bracket 5. In the embodiment of the present application, 12 bolt mounting holes 423 are set, which are evenly arranged along the circumferential direction on the end face of the mechanical sealing labyrinth ring 42. In fact, according to actual parameters such as the size of the wheel 8, the number and setting position of the bolt mounting holes 423 can be flexibly adjusted during application.

[0056] In an embodiment of the present application, two end face feature groove structures 413 are provided on the outer end face of the mechanical sealing threaded ring 41, and the line connecting the two ends passes through the center of the mechanical sealing threaded ring 41. When installing the mechanical sealing threaded ring 41, the two end face feature groove structures 413 are used to support the tooling embedded in the groove to apply a tightening torque so as to screw the mechanical sealing threaded ring 41 to the integrated housing 3.

[0057] The present invention also provides a wheel-side electric drive system suitable for reduction type, comprising a wheel-side motor 1, a wheel-side reduction mechanism 2, an integrated housing 3, a rotating bracket 5, a hub bearing 6 and a rim structure 7, wherein the above-mentioned mechanical sealing structure 4 is arranged between the integrated housing 3 and the rotating bracket 5.

[0058] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A mechanical sealing structure suitable for a reduction wheel electric drive system, characterized in that: Applicable to a reduction-type wheel-side electric drive system, the reduction-type wheel-side electric drive system includes a wheel-side motor, a wheel-side reduction mechanism, an integrated housing, a rotating bracket, a wheel hub bearing and a rim structure; the wheel-side motor is fixedly connected to the integrated housing, the wheel-side reduction mechanism is installed in the integrated housing, the input end of the wheel-side reduction mechanism is connected to the wheel-side motor, and the output end is connected to the rotating bracket, the rotating bracket is fixedly connected to the wheel hub bearing, and the wheel hub bearing is fixedly connected to the rim structure; The mechanical sealing structure is arranged between the integrated housing and the rotating bracket, and includes a mechanical sealing threaded ring and a mechanical sealing labyrinth ring, wherein the mechanical sealing labyrinth ring and the mechanical sealing threaded ring cooperate with each other; The mechanical sealing threaded ring is fixedly connected to the integrated housing by threads, with its inner end surface close to the wheel side reduction mechanism and its outer end surface away from the wheel side reduction mechanism; The mechanical sealing labyrinth ring is fixedly connected to the rotating bracket by bolts, with its inner end surface close to the wheel side reduction mechanism side and its outer end surface away from the wheel side reduction mechanism side; The mechanical sealing threaded ring is an annular structure, the outer side of which is provided with a thread adapted to the integrated housing, and the inner side of which is provided with a staggered fin structure; The mechanical sealing labyrinth ring is an annular structure, the outer side of which cooperates with the staggered fin structure, and the end surface of which is provided with a bolt mounting hole adapted to the rotating bracket; The mechanical sealing threaded ring and the mechanical sealing labyrinth ring are clearance-matched; The staggered fin structure includes a plurality of fins arranged in parallel, each of the fins being annular with an outer diameter matching an inner diameter of a mechanical sealing thread ring and being coaxial with the mechanical sealing thread ring. The fins are divided into a first fin and a second fin. The first fins are in plurality and are arranged on a side close to the wheel-side reduction mechanism, and the second fins are in plurality and are arranged on a side far from the wheel-side reduction mechanism. The length of the first fin is greater than that of the second fin, and the first fin on the side closest to the wheel-side reduction mechanism and the second fin on the side farthest from the wheel-side reduction mechanism are flush with the inner end surface and the outer end surface of the mechanical sealing thread ring. The outer side surface of the mechanical sealing labyrinth ring is provided with a first annular structure with a stepped cross-section. The first vertical surface of the first annular structure is the inner end surface of the mechanical sealing labyrinth ring. The first step surface of the first annular structure cooperates with multiple first fins. The second vertical surface of the first annular structure cooperates with the first fin closest to the second fin. The second step surface of the first annular structure cooperates with multiple second fins.

2. A mechanical sealing structure suitable for a reduction wheel electric drive system according to claim 1, characterized in that: The plurality of first fins of the staggered fin structure are arranged at equal intervals, and the plurality of second fins of the staggered fin structure are arranged at equal intervals.

3. The mechanical sealing structure suitable for a reduction wheel electric drive system according to claim 1, characterized in that: The multiple fins of the staggered fin structure are arranged at equal intervals.

4. The mechanical sealing structure suitable for a reduction wheel electric drive system according to claim 1, characterized in that: The number of the first fins is the same as the number of the second fins.

5. The mechanical sealing structure suitable for a reduction wheel electric drive system according to claim 1, characterized in that: The outer end surface of the mechanical sealing threaded ring is provided with a recessed groove; The outer side of the mechanical seal labyrinth ring is further provided with a radially raised feature structure and an axially raised feature structure, which form a second annular structure with an L-shaped cross section, and the second annular structure is arranged radially outside the first annular structure; The radially raised characteristic structure is connected to the second step surface, and the radially raised characteristic structure cooperates with the inner outer end surface of the mechanical sealing threaded ring. The outer end surface between the sink groove and the inner side surface of the mechanical sealing labyrinth ring is the inner outer end surface of the mechanical sealing threaded ring. The size of the axially raised feature structure is adapted to the size of the recess.

6. The mechanical sealing structure suitable for a reduction-type wheel-side electric drive system according to claim 1, characterized in that: There are multiple bolt mounting holes, which are evenly arranged on the end surface of the mechanical sealing labyrinth ring.

7. The mechanical sealing structure suitable for a reduction wheel electric drive system according to claim 1, characterized in that: The outer end surface of the mechanical sealing threaded ring is provided with two end surface characteristic groove structures.

8. A deceleration wheel electric drive system, characterized in that: It comprises a wheel-side motor, a wheel-side reduction mechanism, an integrated housing, a rotating bracket, a hub bearing and a rim structure. A mechanical sealing structure as described in any one of claims 1 to 7 is provided between the integrated housing and the rotating bracket.

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