Speed reducer assembly and vehicle

Abstract

The speed reducer assembly comprises a speed reducer shell, a driving gear mechanism, a flange plate and an oil seal, the speed reducer shell is provided with a through hole, the driving gear mechanism is arranged on the speed reducer shell and penetrates through the through hole, and the flange plate is arranged on the driving gear mechanism and rotates synchronously with the driving gear mechanism. The oil seal is installed in the through hole and arranged on the flange plate in a sleeving mode, the oil seal is provided with a dustproof lip and at least two oil-proof lips, the dustproof lip is located on the outer sides of the at least two oil-proof lips, and the at least two oil-proof lips are in sealing fit with the flange plate. The dustproof lip and the at least two oil-proof lips are arranged on the oil seal, so that the oil seal can play a role in preventing gear oil from overflowing at the through hole and preventing outside silt from entering the speed reducer shell, the cleanliness in the speed reducer shell can be improved, the service life of the driving gear mechanism can be prolonged, and the service life of the driving gear mechanism is prolonged. And therefore, the reliability, durability and maintenance of the vehicle can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field especially is related to a reducer assembly and vehicle. BACKGROUND

[0002] At present, in the running process of the vehicle, the main reducer assembly as the heart of the rear axle assembly mainly undertakes the functions of reducing the rotating speed, increasing the torque, differential and changing the torque transmission direction, but the main reducer assembly mainly in the market failure mode is early wear and tear and the abnormal sound, howling caused by early wear and tear, these failure modes and the initial assembly, adjustment and calibration of the main reducer, the cleanliness of the main reducer, the structure inside the main reducer, the material quality of the key parts have great relations, each bridge factory in the industry relies on the special main reducer assembly line, special noise detection equipment and other measures can only guarantee that the state after leaving the factory meets the use requirements, but in the use process of the user, the abnormal sound caused by the early wear and tear and the early wear and tear caused by the large meshing gap still occurs from time to time, resulting in the high failure rate of the main reducer.

[0003] In the related art, the main tooth oil seal adopts single-lip sealing, and if a single oil seal lip fails, it will cause the rear axle main tooth oil seal to leak oil, and the lip only plays a role in preventing gear oil overflow, and cannot block the external sand from entering the lip, thereby affecting the cleanliness of the main reducer, so the gear oil needs to be replaced regularly. SUMMARY

[0004] The utility model aims at solving one of the technical problems in the prior art. To this end, one purpose of the utility model is to provide a reducer assembly, which can make the oil seal have the functions of dustproof and oilproof, thereby improving the cleanliness inside the reducer assembly, and further improving the reliable durability and maintenance of the vehicle.

[0005] The utility model further provides a vehicle.

[0006] According to the reducer assembly of the utility model, including: reducer shell, driving gear mechanism, flange plate and oil seal, the reducer shell is provided with a through hole, the driving gear mechanism is arranged in the reducer shell and penetrates the through hole, the flange plate is arranged on the driving gear mechanism and rotates synchronously with the driving gear mechanism, the oil seal is installed in the through hole and sleeved on the flange plate, the oil seal is provided with a dustproof lip and at least two oilproof lips, the dustproof lip is located on the outside of the at least two oilproof lips, and the at least two oilproof lips are respectively in sealing cooperation with the flange plate.

[0007] According to the reducer assembly of the utility model, through the driven gear mechanism is arranged in the through hole of the reducer shell, and the flange plate rotates synchronously with the driven gear mechanism, the oil seal is arranged on the flange plate, the power of the transmission shaft can be transmitted to the driven gear mechanism through the flange plate, and the dustproof lip and the at least two oil-proof lips are arranged on the oil seal, so that the oil seal can prevent the gear oil from overflowing and prevent the external silt from entering the reducer shell, the cleanliness in the reducer shell is improved, the service life of the driven gear mechanism is prolonged, and the reliability and maintenance of the vehicle are improved.

[0008] In some examples of the utility model, the oil seal comprises: a base body in sealing fit with the inner wall of the through hole, at least two oil-proof lips arranged on the inner circumferential surface of the base body, and the dustproof lip arranged on the outer side surface of the base body.

[0009] In some examples of the utility model, the base body comprises: an outer sealing ring, an inner sealing ring and a connecting ring, the outer sealing ring is in sealing fit with the inner wall of the through hole, at least two oil-proof lips are arranged on the inner circumferal surface of the inner sealing ring, the connecting ring is connected between the outer sealing ring and the inner sealing ring, and the dustproof lip is arranged at the connecting position of the inner sealing ring and the connecting ring and extends to the side away from the interior space of the reducer shell.

[0010] In some examples of the utility model, in the direction away from the interior space of the reducer shell, the cross-sectional area of the dustproof lip increases, and the cross section of the dustproof lip is perpendicular to the central axis of the driven gear mechanism.

[0011] In some examples of the utility model, the distance between the two adjacent oil-proof lips increases in the direction of the inward extension of the driven gear mechanism in the radial direction.

[0012] In some examples of the utility model, the reducer assembly further comprises: an oil baffle, the oil baffle is arranged on the driven gear mechanism and located outside the through hole, and the dustproof lip is in sealing fit with the oil baffle.

[0013] In some examples of the utility model, the reducer assembly further comprises: a double-row tapered roller bearing, the double-row tapered roller bearing is installed in the through hole and sleeved on the driven gear mechanism, and the double-row tapered roller bearing is located on the inner side of the oil seal.

[0014] In some examples of the present application, the speed reducer assembly further comprises: a driven gear, a differential housing, a planetary gear shaft and a half shaft gear, the driven gear is engaged with the driving gear of the driving gear mechanism, the driven gear is arranged in the differential housing and rotates synchronously with the differential housing, the planetary gear shaft is arranged in the differential housing and rotates synchronously with the differential housing, the planetary gear is arranged on the planetary gear shaft, and the half shaft gear is arranged in the differential housing and engaged with the planetary gear.

[0015] In some examples of the present application, the speed reducer housing is an aluminum part made of aluminum A356-T6; and / or at least one of the driving gear, the driven gear, the planetary gear shaft, the planetary gear and the half shaft gear is a steel part made of steel 22CrMo.

[0016] According to the vehicle of the present application, comprising: the above-mentioned speed reducer assembly.

[0017] Compared with the prior art, the present application adopts the mode that the driving gear mechanism is arranged in the through hole of the speed reducer housing, the flange plate rotates synchronously with the driving gear mechanism, and the oil seal is arranged on the flange plate, so that the flange plate can transmit the power of the transmission shaft to the driving gear mechanism, and the dust lip and at least two oil lips are arranged on the oil seal, so that the oil seal can prevent the gear oil from overflowing and block the external sand from entering the speed reducer housing, thereby improving the cleanliness of the speed reducer housing, prolonging the service life of the driving gear mechanism, and improving the reliability and maintenance of the vehicle.

[0018] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

[0020] Figure 1 is a structural schematic view of a speed reducer assembly according to an embodiment of the present application;

[0021] Figure 2 is Figure 1 is an enlarged view of A in FIG.

[0022] REFERENCE NUMERALS:

[0023] 100, speed reducer assembly;

[0024] 10. Reducer housing; 20. Drive gear mechanism; 30. Flange; 40. Oil seal; 41. Base; 411. Outer sealing ring; 412. Inner sealing ring; 413. Connecting ring; 42. Oil-proof lip; 43. Dust-proof lip; 50. Oil baffle; 60. Double row tapered roller bearing; 70. Driven gear; 71. Differential housing; 72. Planetary gear shaft; 73. Planetary gear; 74. Half-shaft gear. Detailed Implementation

[0025] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0026] The following is for reference. Figure 1 and Figure 2 This invention describes a speed reducer assembly 100 according to an embodiment of the present invention, which is used in a vehicle, for example, in a rear axle assembly.

[0027] like Figure 1 and Figure 2 As shown, the reducer assembly 100 according to this utility model includes: a reducer housing 10, a drive gear mechanism 20, a flange 30, and an oil seal 40. The reducer housing 10 is provided with a through hole. The drive gear mechanism 20 is disposed in the reducer housing 10 and passes through the through hole. The flange 30 is disposed in the drive gear mechanism 20 and rotates synchronously with the drive gear mechanism 20. The oil seal 40 is installed in the through hole and sleeved on the flange 30. The oil seal 40 is provided with a dustproof lip 43 and at least two oilproof lips 42. The dustproof lip 43 is located outside the at least two oilproof lips 42. The at least two oilproof lips 42 are respectively sealed and fitted with the flange 30.

[0028] Understandably, the reducer housing 10, drive gear mechanism 20, flange 30, and oil seal 40 constitute the main structure of the reducer assembly 100. The drive gear mechanism 20 is located inside the reducer housing 10. This arrangement allows the reducer housing 10 to protect the drive gear mechanism 20, thereby extending its service life. The flange 30 is connected to the drive gear mechanism 20, and the flange 30 rotates synchronously with the drive gear mechanism 20. This arrangement allows the power from the drive shaft to be transmitted to the drive gear mechanism 20 through the flange 30, thereby enabling the drive gear mechanism 20 to rotate. In turn, the reducer assembly 100 can achieve vehicle deceleration and wheel differential effects.

[0029] The reducer housing 10 has a through hole through which the drive gear structure passes. This design provides space for the drive gear to move, facilitating the transmission of power from the drive shaft to the drive gear mechanism 20. An oil seal 40 is also installed at the through hole, fitted onto the flange 30. This design facilitates the installation of the flange 30 and the oil seal 40 and prevents gear oil from overflowing from the drive gear mechanism 20, thus ensuring the cleanliness of the reducer assembly 100. The oil seal 40 has a dustproof lip 43 and at least two oilproof lips 42. The dustproof lip 43 is located outside the at least two oilproof lips 42, which are respectively sealed to the flange 30. This allows the oil seal 40 to prevent gear oil from overflowing from the through hole and to block external dirt and sand from entering the reducer housing 10, thereby improving the cleanliness of the reducer housing 10, extending the service life of the drive gear mechanism 20, and ultimately improving the reliability, durability, and maintainability of the vehicle.

[0030] Therefore, by having the drive gear mechanism 20 pass through the through hole of the reducer housing 10, and the flange 30 rotate synchronously with the drive gear mechanism 20, and an oil seal 40 is provided on the flange 30, the flange can transmit the power of the drive shaft to the drive gear mechanism 20. Moreover, the oil seal 40 is provided with a dustproof lip 43 and at least two oilproof lips 42, so that the oil seal 40 can prevent gear oil from overflowing at the through hole and block external mud and sand from entering the reducer housing 10, thereby improving the cleanliness of the reducer housing 10, extending the service life of the drive gear mechanism 20, and thus improving the reliability, durability and maintainability of the vehicle.

[0031] In addition, such as Figure 2 As shown, the oil seal 40 includes: a base 41, which is sealed to the inner wall of the through hole; at least two oil-proof lips 42 are disposed on the inner circumferential surface of the base 41; and a dust-proof lip 43 is disposed on the outer surface of the base 41.

[0032] Understandably, the base 41 is located at the through hole, and the base 41 is sealed to the inner wall of the through hole. This prevents the oil in the reducer housing 10 from overflowing from the through hole. At least two oil-proof lips 42 are provided on the inner circumferential surface of the base 41. This arrangement allows the two oil-proof lips 42 to block the oil in the reducer housing 10, thereby ensuring that the oil on the main gear mechanism does not flow from the through hole to the outside of the reducer housing 10. The dust-proof lip 43 is provided on the outer side of the base 41. This arrangement can prevent external mud and sand from entering the reducer housing 10, thereby ensuring the cleanliness of the reducer housing 10 and extending the service life of the drive gear mechanism 20. This, in turn, can improve the reliability, durability, and maintainability of the vehicle.

[0033] In addition, such as Figure 2As shown, the base 41 includes an outer sealing ring 411, an inner sealing ring 412, and a connecting ring 413. The outer sealing ring 411 is sealed to the inner wall of the through hole. At least two oil-proof lips 42 are provided on the inner circumferential surface of the inner sealing ring 412. The connecting ring 413 is connected between the outer sealing ring 411 and the inner sealing ring 412. The dustproof lip 43 is provided at the connection between the inner sealing ring 412 and the connecting ring 413 and extends away from the internal space of the reducer housing 10.

[0034] In other words, the outer sealing ring 411, the inner sealing ring 412, and the connecting ring 413 constitute the main structure of the base 41. The connecting ring 413 is located between the outer sealing ring 411 and the inner sealing ring 412, thereby enabling the outer sealing ring 411, the inner sealing ring 412, and the connecting ring 413 to form a whole, which can improve the oil seal 40's ability to block air and oil. The outer sealing ring 411 abuts against the inner wall of the through hole, thereby enabling the outer sealing ring 411 to seal the through hole. At least two oil-proof lips 42 are provided on the inner circumferential surface of the inner sealing ring 412. This arrangement can prevent at least two oil-proof lips from forming an oil seal. The oil-proof lip 42 faces inward to the reducer housing 10, thereby blocking the oil inside the reducer housing 10 and ensuring that the reducer assembly 100 does not leak oil. The dustproof lip 43 is located at the connection between the inner sealing ring 412 and the connecting ring 413. This arrangement allows the dustproof lip 43 to extend away from the internal space of the reducer housing 10, thereby sealing the through hole and preventing impurities in the air from entering the reducer housing 10. It also enables the reducer assembly 100 to achieve a maintenance-free effect.

[0035] In particular, such as Figure 2 As shown, the cross-sectional area of ​​the dustproof lip 43 increases in the direction away from the internal space of the reducer housing 10, and the cross-section of the dustproof lip 43 is perpendicular to the central axis of the drive gear mechanism 20.

[0036] Understandably, the cross-sectional area of ​​the end of the dustproof lip 43 furthest from the internal space of the reducer housing 10 is larger than the cross-sectional area of ​​the end of the dustproof lip 43 closest to the internal space of the reducer housing 10, and the cross-sectional area of ​​the dustproof lip 43 increases progressively. This arrangement can save material for the dustproof lip 43 while ensuring its function, thereby achieving a lightweight design for the oil seal 40 and ensuring the dustproof lip 43's ability to block impurities. The cross-section of the dustproof lip 43 is perpendicular to the central axis of the drive gear mechanism 20. This arrangement ensures that the dustproof lip 43 can block impurities in the air from entering the reducer housing 10 to the greatest extent, thereby ensuring the cleanliness inside the reducer housing 10 and enabling the reducer assembly 100 to achieve a maintenance-free effect.

[0037] In addition, such as Figure 2As shown, the distance between two adjacent oil-proof lips 42 increases in the direction of radial inward extension of the drive gear mechanism 20.

[0038] In other words, at least two oil-proof lips 42 are arranged at intervals, and the distance between the two oil-proof lips 42 increases in the direction of radial inward extension of the drive gear mechanism 20. This can increase the blocking area of ​​the oil-proof lips 42 against the oil, thereby preventing the oil from overflowing from the drive gear mechanism 20, thus protecting the safety and durability of the drive gear mechanism 20, and also keeping the cleanliness of the outer side of the reducer housing 10.

[0039] In addition, such as Figure 1 and Figure 2 As shown, the reducer assembly 100 also includes an oil baffle 50, which is disposed on the drive gear mechanism 20 and located outside the through hole. A dustproof lip 43 is sealed to the oil baffle 50. It can be understood that the oil baffle 50 is located on one side of the drive gear mechanism 20 and is positioned at the through hole. This allows the oil baffle 50 to block the oil on the drive gear mechanism 20. The dustproof lip 43 seals to the oil baffle 50, ensuring that oil does not flow into the outside of the reducer housing 10 through the through hole. This also enables the reducer assembly 100 to be maintenance-free, thereby improving the maintainability of the rear axle and reducing vehicle maintenance costs.

[0040] In addition, such as Figure 1 As shown, the reducer assembly 100 also includes a double-row tapered roller bearing 60, which is installed in the through hole and sleeved on the drive gear mechanism 20. The double-row tapered roller bearing 60 is located inside the oil seal 40.

[0041] In other words, one end of the double-row tapered roller bearing 60 abuts against the flange 30, and the other end abuts against the drive gear mechanism 20. This arrangement allows the double-row tapered roller bearing 60 to keep the starting torque of the drive gear mechanism 20 within a stable range. The double-row tapered roller bearing 60 is located at the through hole and inside the oil seal 40, which allows it to be directly tightened with a lock nut. This allows designers to define parameters such as starting torque, working clearance, equivalent load, and rated dynamic and static loads based on the vehicle's power and economic indicators, thereby ensuring that no maintenance or adjustment is required during subsequent vehicle operation.

[0042] In addition, such as Figure 1As shown, the reducer assembly 100 also includes: a driven gear 70, a differential housing 71, a planetary gear shaft 72, and a half-shaft gear 74. The driven gear 70 meshes with the driving gear of the driving gear mechanism 20. The driven gear 70 is disposed in the differential housing 71 and rotates synchronously with the differential housing 71. The planetary gear shaft 72 is disposed inside the differential housing 71 and rotates synchronously with the differential housing 71. The planetary gear 73 is disposed in the planetary gear shaft 72. The half-shaft gear 74 is disposed inside the differential housing 71 and meshes with the planetary gear 73.

[0043] Understandably, the driven gear 70 and half-shaft gear 74 are located inside the differential housing 71. This arrangement protects the driven gear 70 and half-shaft gear 74, thus extending their service life. The driven gear 70 meshes with the driving gear of the driving gear mechanism 20, allowing the power from the drive shaft to be transmitted to the driven gear 70 via the driving gear mechanism 20. The driven gear 70 and planetary gear shaft 72 rotate synchronously with the differential housing 71. The planetary gear shaft 72 passes through the planetary gear 73. This arrangement allows the power from the drive shaft to be transmitted to the driven gear 70 via the driving gear mechanism 20. The driven gear 70 drives the reducer housing 10 to rotate, which in turn drives the planetary gear shaft 72 to rotate. The power from the planetary gear shaft 72 is then transmitted to the planetary gear 73, and finally, the planetary gear 73 transmits the power to the half-shaft gear 74, thereby achieving power redistribution and thus maintaining vehicle speed balance.

[0044] Specifically, the reducer housing 10 is an aluminum component made of aluminum A356-T6; at least one of the drive gear, driven gear 70, planetary gear shaft 72, planetary gear 73 and half-shaft gear 74 is a steel component made of steel 22CrMo.

[0045] In other words, the reducer housing 10 is made of aluminum A356-T6, which not only enables a lightweight design of the reducer assembly 100 but also improves the cleanliness and machining accuracy of the reducer assembly 100. The driven gear 70, differential housing 71, planetary gear shaft 72, and half-shaft gear 74 are made of steel 22CrMo, which, compared to the traditional 20CrMnTi, increases the tensile strength of the driven gear 70, differential housing 71, planetary gear shaft 72, and half-shaft gear 74 by 10.2%. The yield strength can be increased by 6.37%, the tooth root bending strength can be increased by 10%, and the tooth surface contact strength can be increased by 15%. Moreover, the hardenability of 22CrMo is better than that of 20CrMnTi. During the heat treatment process, a more uniform hardness distribution and better wear resistance can be obtained. The life of driven gear 70, differential housing 71, planetary gear shaft 72 and half-shaft gear 74 is estimated to be increased by 20%, thereby achieving maintenance-free operation of driven gear 70, differential housing 71, planetary gear shaft 72 and half-shaft gear 74.

[0046] The vehicle according to this utility model includes: a reducer assembly 100 as described in the above embodiments. By having the drive gear mechanism 20 pass through the through hole of the reducer housing 10, and the flange 30 rotating synchronously with the drive gear mechanism 20, and an oil seal 40 provided on the flange 30, the flange can transmit the power of the drive shaft to the drive gear mechanism 20. Furthermore, the oil seal 40 is provided with a dustproof lip 43 and at least two oilproof lips 42, which prevents gear oil from overflowing from the through hole and blocks external dirt and sand from entering the reducer housing 10. This improves the cleanliness of the reducer housing 10, extends the service life of the drive gear mechanism 20, and consequently enhances the vehicle's reliability, durability, and maintainability.

[0047] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0048] In the description of this utility model, "first feature" and "second feature" may include one or more of the features. In the description of this utility model, "multiple" means two or more. In the description of this utility model, "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. In the description of this utility model, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0050] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A reducer assembly (100), characterized by, The application relates to a reducer shell (10) provided with a through hole; a driving gear mechanism (20) arranged in the reducer shell (10) and penetrating through the through hole; a flange plate (30) arranged in the driving gear mechanism (20) and rotating synchronously with the driving gear mechanism (20); and an oil seal (40) installed in the through hole and sleeved on the flange plate (30), wherein the oil seal (40) is provided with a dust lip (43) and at least two oil-proof lips (42), the dust lip (43) is located outside the at least two oil-proof lips (42), and the at least two oil-proof lips (42) are in sealing cooperation with the flange plate (30) respectively. The oil seal (40) comprises a base body (41) in sealing cooperation with the inner wall of the through hole, at least two oil-proof lips (42) arranged on the inner circumferential surface of the base body (41), and a dust lip (43) arranged on the outer surface of the base body (41). The base body (41) comprises an outer sealing ring (411) in sealing cooperation with the inner wall of the through hole, an inner sealing ring (412) on which the at least two oil-proof lips (42) are arranged, and a connecting ring (413) connected between the outer sealing ring (411) and the inner sealing ring (412), wherein the dust lip (43) is arranged at the connection between the inner sealing ring (412) and the connecting ring (413) and extends to the side away from the internal space of the reducer shell (10). In the direction away from the internal space of the reducer shell (10), the cross-sectional area of the dust lip (43) increases, and the cross section of the dust lip (43) is perpendicular to the central axis of the driving gear mechanism (20). The distance between two adjacent oil-proof lips (42) increases in the direction extending radially inward of the driving gear mechanism (20).

2. The reducer assembly (100) of claim 1, wherein, The application further comprises an oil baffle (50) arranged on the driving gear mechanism (20) and located outside the through hole, and the dust lip (43) is in sealing cooperation with the oil baffle (50). The application further comprises a double-row tapered roller bearing (60) installed in the through hole and sleeved on the driving gear mechanism (20), and the double-row tapered roller bearing (60) is located inside the oil seal (40).

3. The reducer assembly (100) of claim 2, wherein, The application further comprises a driven gear (70) engaged with the driving gear of the driving gear mechanism (20), a differential shell (71) in which the driven gear (70) is arranged and rotates synchronously with the differential shell (71), a planetary gear shaft (72) arranged in the differential shell (71) and rotating synchronously with the differential shell (71). ​ ​ ​ 4. The reducer assembly (100) of claim 1, wherein, ​ 5. The reducer assembly (100) of claim 1, wherein, ​ 6. The reducer assembly (100) of claim 1, wherein, ​ ​ 7. The reducer assembly (100) of claim 1, wherein, ​ ​ 8. The reducer assembly (100) of claim 1, wherein, ​ ​ ​ ​ a planet gear (73) disposed on the planet gear shaft (72); a pinion gear (74) disposed within the differential case (71) and engaged with the planet gear (73).

9. The reducer assembly (100) of claim 8, wherein, the reducer case (10) is an aluminum piece made of aluminum A356-T6; and / or at least one of the driving gear, the driven gear (70), the planet gear shaft (72), the planet gear (73), and the pinion gear (74) is a steel piece made of steel 22CrMo.

10. A vehicle characterized by comprising: comprising: the reducer assembly (100) of any one of claims 1-9.

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