A reducer, electric drive assembly and mixer truck

Abstract

The present invention relates to the technical field related to operating machinery, and its purpose is to provide a speed reducer, an electric drive assembly, and a mixer truck. The electric drive assembly can be connected to the tank body without too many parts, is easy to install, has a compact and reasonable structure, and has high transmission efficiency. The above-mentioned speed reducer includes a housing and a first-stage gear transmission mechanism, a second-stage gear transmission mechanism, and a third-stage gear transmission mechanism arranged in the housing and sequentially connected in transmission, wherein the power output member of the third-stage gear transmission mechanism is a third-stage internal gear ring. The present invention solves the problems of existing electric drive devices requiring many parts when connected to the tank body, having a non-compact structure, occupying a large space, and being difficult to install.

Description

Technical Field

[0001] The present invention relates to the technical field related to operating machinery, and in particular to a reducer, an electric drive assembly and a mixer truck. Background Art

[0002] A mixer truck is a special truck used to transport construction materials, usually a concrete mixer truck. It has a mixing tank with mixed concrete placed in it. The mixing tank must be kept rotating during transportation to ensure that the transported concrete does not solidify.

[0003] The rotation of the mixing tank is achieved by a drive device. The traditional mixing tank drive device is hydraulically driven. During transportation, since the hydraulic oil pump and the power take-off are mechanically connected, the oil pressure of the hydraulic oil pump will increase or decrease due to the influence of the engine speed, so that the tank speed is affected by the engine speed, and the tank rotation is also easily affected by factors such as complex working conditions of the vehicle, resulting in poor operating stability of the mixing tank.

[0004] To address this issue, existing technology has developed an electric drive device for agitator tanks. The reducer of this electric drive device uses a three-stage planetary gear train to adjust the reduction ratio. However, the output end of this three-stage planetary reducer is the planetary carrier in the third-stage planetary mechanism. When connecting the planetary carrier to the agitator tank, a dedicated output shaft is required. This output shaft also needs to be equipped with seals, bearings, and other components and connected to the agitator tank body via a flange. This connection structure requires many parts, is not compact, and is cumbersome to install. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the existing mixing barrel electric drive device in that it requires many components when connected to the tank body, has a non-compact structure, occupies a large space, and is troublesome to install, thereby providing a reducer, electric drive assembly and mixer truck that can be connected to the tank body without too many components, is easy to install, has a compact and reasonable structure, and has high transmission efficiency.

[0006] In order to solve the above problems, the present invention provides a reducer, comprising:

[0007] case;

[0008] A first-stage gear transmission mechanism is disposed in the housing and includes a first-stage sun gear shaft, first-stage planetary gears, a first-stage planetary carrier, and a first-stage inner ring gear, wherein the first-stage inner ring gear is fixedly connected to the inner wall of the housing;

[0009] a second-stage gear transmission mechanism, disposed in the housing and in transmission connection with the first-stage gear transmission mechanism, comprising a second-stage sun gear shaft, second-stage planetary gears, a second-stage planetary carrier, and a second-stage inner ring gear, wherein the second-stage inner ring gear is fixed to the housing;

[0010] The third-stage gear transmission mechanism is arranged in the housing and is in transmission connection with the second-stage gear transmission mechanism. It includes a third-stage sun gear shaft, a third-stage planetary gear, a third-stage planetary carrier and a third-stage inner ring gear. The third-stage planetary carrier is fixedly connected to the housing, and the third-stage inner ring gear is the power output component of the reducer.

[0011] Optionally, the first-stage planetary gear is disposed between the first-stage sun gear shaft and the first-stage inner gear ring and is meshed with the first-stage sun gear shaft and the first-stage inner gear ring;

[0012] The second-stage sun gear shaft is fixedly connected to the first-stage planet carrier, and the second-stage planetary gear is arranged between the second-stage sun gear shaft and the second-stage inner gear ring and meshes with the second-stage sun gear shaft and the second-stage inner gear ring;

[0013] The third-stage sun gear shaft is fixedly connected to the second-stage planet carrier, and the third-stage planetary gear is arranged between the third-stage sun gear shaft and the third-stage inner gear ring and meshes with the third-stage sun gear shaft and the third-stage inner gear ring.

[0014] Optionally, the portion where the first-stage sun gear shaft meshes with the first-stage planetary gear is a helical gear portion.

[0015] Optionally, the middle part of the first-stage sun gear shaft is connected to the housing through a first-stage supporting member; the middle part of the second-stage planet carrier is connected to the housing through a second-stage supporting member; and an axial limit member is provided at the connection between the second-stage sun gear shaft and the first-stage planet carrier.

[0016] Optionally, it further includes a first fixing seat and a second fixing seat, and the first fixing seat, the side wall of the second-stage inner gear ring, the second fixing seat and the side wall of the third-stage inner gear ring are sealed and connected in sequence to form the shell.

[0017] Optionally, a sealing mechanism is provided between the second-stage planetary mechanism and the third-stage planetary mechanism, and the sealing mechanism separates the interior of the reducer into a high-speed oil chamber and a low-speed oil chamber.

[0018] An electric drive assembly comprises a drive device and the above-mentioned reducer, wherein the output shaft of the drive device is fixedly connected to the first-stage sun gear shaft of the reducer.

[0019] Optionally, the driving device adopts a parent-child motor.

[0020] Optionally, the mother-and-child motor includes a mother motor and a child motor, the output end of the mother motor shaft is fixedly connected to the first-stage sun gear shaft, and the input end of the mother motor shaft is meshed with the output end of the child motor shaft via an idler gear.

[0021] A mixer truck comprises a mixing tank, wherein the mixing tank is driven by the above-mentioned electric drive assembly.

[0022] The present invention has the following advantages:

[0023] (1) The reducer provided by the present invention has a three-stage planetary gear mechanism arranged in the shell, which has the characteristics of simple structure, reliable performance, large output torque and high transmission efficiency. The power output component of the reducer is the third-stage internal gear ring. When the third-stage internal gear ring is installed with the tank body, no seals, bearings and other parts are required. Only bolts and other fasteners are needed to achieve installation and connection. The structure is compact and reasonable, the installation is convenient, and it is firm, reliable and not easy to damage.

[0024] (2) The reducer provided by the present invention has a helical gear portion where the first-stage sun gear shaft meshes with the first-stage planetary gear. The helical gear transmission has the characteristics of low noise and smooth operation, which is conducive to the stable operation of the overall transmission mechanism.

[0025] (3) The reducer provided by the present invention is divided into a high-speed oil chamber and a low-speed oil chamber by a sealing mechanism. The high-speed oil chamber is provided with a first-stage planetary gear mechanism and a second-stage planetary gear mechanism, and the low-speed oil chamber is provided with a third-stage planetary gear mechanism. The oil level line of the high-speed oil chamber can always be kept lower than the oil level line of the low-speed oil chamber, so that the oil levels of the two oil chambers do not interfere with each other, and the planetary gear mechanisms of each stage are always kept in a relatively balanced and ideal state.

[0026] (4) The electric drive assembly provided by the present invention has a drive device that uses a parent-child motor and has an emergency function. That is, when the parent motor fails, the child motor can continue to provide power to ensure the stability and continuity of the operation of the electric drive assembly.

[0027] (5) The mixer truck provided by the present invention has a mixing tank driven by the electric drive assembly of the present invention, wherein the power output member of the reducer (i.e., the third-stage internal gear ring) can be directly installed with the tank body of the mixing tank using fasteners, without the need for other redundant parts. The structure is compact and easy to install. In addition, the use of a letter motor can calmly deal with emergencies and ensure the stability and continuity of the operation of the electric drive assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 shows an overall schematic diagram of the electric drive assembly of the present invention;

[0030] Figure 2 shows a cross-sectional view of the electric drive assembly of the present invention;

[0031] Figure 3 A partial schematic diagram of the first-stage planetary gear mechanism in the electric drive assembly of the present invention is shown;

[0032] Figure 4 A partial schematic diagram of the second-stage planetary gear mechanism in the electric drive assembly of the present invention is shown;

[0033] Figure 5 A schematic diagram of a sealing mechanism in the electric drive assembly of the present invention is shown;

[0034] Figure 6 A cross-sectional view of the mother-son motor in the electric drive assembly of the present invention is shown.

[0035] Description of reference numerals:

[0036] 101 - first-stage sun gear shaft, 1011 - helical gear unit, 102 - first-stage planetary gear, 103 - first-stage planet carrier, 104 - second-stage sun gear shaft, 105 - second-stage planetary gear, 106 - second-stage planet carrier, 107 - second-stage inner ring gear, 108 - third-stage sun gear shaft, 109 - third-stage planetary gear, 110 - third-stage planet carrier, 111 - third-stage inner ring gear, 112 - first-stage bearing, 113 - second-stage bearing, 114 - retaining ring, 115 - spacer, 116 - bolt, 117 - assembly through hole, 118 - rolling bearing;

[0037] 201-first fixed seat, 202-second fixed seat;

[0038] 301-first O-ring, 302-first oil seal, 303-second oil seal, 304-third oil seal, 305-second O-ring;

[0039] 4 - driving device, 401 - main motor, 4011 - main motor shaft, 402 - sub-motor, 4021 - sub-motor shaft, 403 - idler wheel, 404 - transmission wheel; 405 - connecting spline;

[0040] 501-round tube, 502-steel ball vent plug;

[0041] 6-Oil mark;

[0042] 7-end cap;

[0043] 8- base;

[0044] 901 - first elastic element, 902 - second elastic element, 903 - third elastic element, 904 - ball top; 905 - seat plate. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0048] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0049] like Figure 1 FIG. 1 is a preferred embodiment of the electric drive assembly of the present invention.

[0050] The electric drive assembly includes a drive unit 4 and a reducer. Drive unit 4 is the power source for the entire electric drive assembly, while the reducer is used to reduce the drive unit's rotational speed and transmit torque to the actuator. The output shaft of drive unit 4 is fixedly connected to the reducer's power input, and the reducer's power output is fixedly connected to the actuator.

[0051] like Figure 2-4 As shown, the reducer of this embodiment includes a housing and a first-stage gear transmission mechanism, a second-stage gear transmission mechanism and a third-stage gear transmission mechanism arranged in the housing and sequentially connected in transmission.

[0052] In this embodiment, the first-stage gear transmission mechanism is a first-stage planetary gear mechanism, the second-stage gear transmission mechanism is a second-stage planetary gear mechanism, and the third-stage gear transmission mechanism is a third-stage planetary gear mechanism. These three-stage planetary gear mechanisms are coaxially arranged within the housing, with the power input member of the speed reducer disposed in the first-stage planetary gear mechanism, and the power output member of the speed reducer disposed in the third-stage planetary gear mechanism.

[0053] Specifically, the first-stage planetary gear mechanism includes a first-stage sun gear shaft 101, first-stage planetary gears 102, a first-stage planetary carrier 103, and a first-stage inner ring gear. The first-stage sun gear shaft 101 serves as the power input component of the reducer. In this embodiment, there are three first-stage planetary gears 102, which are disposed between and mesh with the first-stage sun gear shaft 101 and the first-stage inner ring gear. The first-stage inner ring gear is fixedly connected to the inner wall of the housing. The first-stage planetary carrier 103 can rotate driven by the first-stage planetary gears 102. Furthermore, the meshing portion of the first-stage sun gear shaft 101 and the first-stage planetary gears 102 is a helical gear portion 1011. The helical gear transmission ensures smoother and quieter operation of the first-stage planetary gear mechanism. The middle part of the first-stage sun gear shaft 101 is connected to the housing through a first-stage supporting member. In this embodiment, the first-stage supporting member is a first-stage bearing 112. The inner ring of the first-stage bearing 112 is fixed to the middle part of the first-stage sun gear shaft 101, and the outer ring of the first-stage bearing 112 is fixedly connected to the housing. The first-stage bearing 112 has the function of limiting and bearing the first-stage sun gear shaft 101, thereby supporting the first-stage planetary gear mechanism to ensure stable transmission of power.

[0054] The second-stage planetary gear mechanism includes a second-stage sun gear shaft 104, second-stage planetary gears 105, a second-stage planetary carrier 106, and a second-stage inner ring gear 107. In this embodiment, there are three second-stage planetary gears 104. The second-stage sun gear shaft 104 is fixedly connected to the first-stage planetary carrier 103. The second-stage planetary gears 105 are disposed between and mesh with the second-stage sun gear shaft 104 and the second-stage inner ring gear 107. The second-stage inner ring gear 107 is fixed to the housing, and the second-stage planetary carrier 106 can rotate driven by the second-stage planetary gears 105. Furthermore, an axial stopper is provided at the connection between the second-stage sun gear shaft 104 and the first-stage planetary carrier 103 to prevent the second-stage sun gear shaft 104 from axially dislodging from the first-stage planetary carrier 103. The axial limiting member is two retaining rings 114. The center of the first-stage planetary carrier 103 has a mounting hole. The inner wall of the mounting hole has a tooth shape that matches the outer wall of the second-stage sun gear shaft 104. During installation, the second-stage sun gear shaft 104 is inserted into the mounting hole of the first-stage planetary carrier 103 and engages with it. A retaining ring 114 is installed on the part of the second-stage sun gear shaft 104 that extends out of the mounting hole, and another retaining ring 114 is installed on the part of the second-stage sun gear shaft 104 that does not enter the mounting hole. The two retaining rings 114 cooperate with each other to prevent the second-stage sun gear shaft 104 from jumping out of the mounting hole of the first-stage planetary carrier 103, thereby realizing the axial limiting of the second-stage sun gear shaft 104. The middle part of the second-stage planetary carrier 106 is connected to the housing through a second-stage supporting member. In this embodiment, the second-stage supporting member is a second-stage bearing 113. The inner ring of the second-stage bearing 113 is fixed to the second-stage planetary carrier 106, and the outer ring of the second-stage bearing 113 is fixedly connected to the housing. The second-stage bearing 113 has the function of limiting and bearing the second-stage planetary carrier 106, thereby supporting the second-stage planetary gear mechanism to ensure stable transmission of power.

[0055] The third-stage planetary gear mechanism includes a third-stage sun gear shaft 108, third-stage planetary gears 109, a third-stage planetary carrier 110, and a third-stage inner ring gear 111. In this embodiment, there are three third-stage planetary gears 109. The third-stage sun gear shaft 108 is fixedly connected to the second-stage planetary carrier 106. Specifically, the third-stage sun gear shaft 108 and the second-stage planetary carrier 106 are fixedly connected via bolts 116. The third-stage planetary gears 109 are disposed between the third-stage sun gear shaft 108 and the third-stage inner ring gear 111 and mesh with them. The third-stage planetary carrier 110 is fixedly connected to the housing. The third-stage inner ring gear 111 serves as the power output component of the reducer. An oil gauge 6 is also provided on the third-stage inner ring gear 111 to indicate the oil level in the reducer. The third-stage inner gear ring 111 has a reserved interface for connecting to the actuator. This interface is equipped with an end cap 7 and has several through-holes 117 formed therein, which securely connect the third-stage inner gear ring 111 to the actuator. Rolling bearings 118 are also provided on the inner wall of the third-stage inner gear ring 111 to support the actuator's gravity, forming a reliable gravity support structure.

[0056] The reducer of this embodiment further includes a first fixed seat 201 and a second fixed seat 202. The first fixed seat 201, the side wall of the second-stage inner gear ring 107, the second fixed seat 202, and the side wall of the third-stage inner gear ring 111 are sealed and connected in sequence to form a housing. The first-stage inner gear ring is tightly connected to the inner wall of the first fixed seat 201. The outer ring of the first-stage bearing 112 is fixedly connected to the inner wall of the first fixed seat 201, and the outer ring of the second-stage bearing 113 is fixedly connected to the inner wall of the second fixed seat 202.

[0057] A sealing mechanism is provided between the second-stage planetary mechanism and the third-stage planetary mechanism, which divides the interior of the reducer into a high-speed oil chamber and a low-speed oil chamber. The first-stage planetary mechanism and the second-stage planetary mechanism are arranged in the high-speed oil chamber, and the third-stage planetary mechanism is arranged in the low-speed oil chamber.

[0058] The high-speed and low-speed oil chambers can be filled with lubricating oil for independent lubrication and heat dissipation. The high-speed oil chamber is suitable for high-speed operation and requires a low oil level, while the low-speed oil chamber is suitable for high torque output and requires a high oil level. The lubricating oil in both the high-speed and low-speed oil chambers provides oil bath or splash lubrication for each bearing and gear, while also providing cooling. This increases the contact area between the lubricating oil and each bearing and gear, improving lubrication effectiveness. This reduces the accelerated temperature rise of the reducer caused by poor lubrication and cooling, and reduces the failure rate of bearings and gears. Oil level windows are also installed in the high-speed and low-speed oil chambers to observe the internal oil levels.

[0059] like Figure 5As shown, the sealing mechanism includes: a first O-ring 301, a first oil seal 302, a second oil seal 303, a third oil seal 304, and a second O-ring 305. The first O-ring 301 is disposed at the junction of the second-stage inner gear ring 107 and the second fixed seat 202; the first oil seal 302 is disposed between the first fixed seat 201 and the first-stage sun gear shaft 101; the second oil seal 303 is disposed between the third-stage sun gear shaft 108 and the second fixed seat 202; the third oil seal 304 is disposed between the second fixed seat 202 and the spacer 115, which is fixedly connected to the inner wall of the third-stage inner gear ring 111; and the second O-ring 305 is disposed between the third-stage inner gear ring 111 and the spacer 115.

[0060] The high-speed oil chamber and the low-speed oil chamber are isolated by a sealing mechanism, which can maintain the oil pressure and temperature of each oil chamber. The operation of the first-stage planetary mechanism, the second-stage planetary mechanism and the third-stage planetary mechanism do not interfere with each other, thereby ensuring that each planetary mechanism always remains in a relatively balanced state, so that the force on each component of the entire reducer is more balanced and stable, thereby improving the service life of the entire reducer.

[0061] The reducer of this embodiment further includes an internal and external pressure difference balancing mechanism and a shock absorbing mechanism.

[0062] Among them, the internal and external pressure difference balancing mechanism includes a circular tube 501 and a steel ball type vent plug 502. The internal and external pressure difference balancing mechanism is used to maintain the pressure balance inside and outside the reducer cavity, preventing the lubricating oil from leaking out at the steel ball type vent plug, causing a large amount of oil to accumulate at the steel ball type vent plug.

[0063] The shock-absorbing mechanism includes a base 8, a first elastic element 901, a second elastic element 902, a third elastic element 903, a dome 905, a wear pad, and a seat plate 905. The first elastic element 901, the second elastic element 902, and the third elastic element 903 are all made of rubber. When used in a truck mixer, the shock-absorbing mechanism absorbs vibration and any degree of deflection, enhancing the stability and safety of the mixer drum during operation.

[0064] like Figure 6 As shown, in this embodiment, the driving device 4 adopts a parent-child motor, which has an emergency rescue function. Once the parent motor fails during transportation, the child motor can start working.

[0065] The parent-child motor includes a parent motor 401 and a child motor 402. The output end of the parent motor shaft 4011 is fixedly connected to the first-stage sun gear shaft 401, thereby transmitting power to the first-stage planetary mechanism of the reducer. The input end of the parent motor shaft 4011 is meshed with the output end of the child motor shaft 4021 via an idler gear 403. Specifically, the input end of the parent motor shaft 4011 is fixedly connected to the transmission wheel 404, and the output end of the child motor shaft 4021 is fixedly connected to the connecting spline 405. The idler gear 403 meshes between the transmission wheel 404 and the connecting spline 405 for transmission.

[0066] The transmission process of the electric drive assembly of this embodiment is described below:

[0067] When the mother motor 401 can operate normally, the sub-motor 402 is in the power generation state, and the output end of the mother motor shaft 4011 drives the first-stage sun gear shaft 101 to rotate, and the first-stage sun gear shaft 101 drives the first-stage planetary gear 102 and the first-stage planetary carrier 103 to rotate, and the first-stage planetary carrier 103 drives the second-stage sun gear shaft 104 to rotate, and the second-stage sun gear shaft 104 drives the second-stage planetary gear 05 and the second-stage planetary carrier 106 to rotate, and the second-stage planetary carrier 106 drives the third-stage sun gear shaft 108 to rotate, and the third-stage sun gear shaft 108 drives the third-stage planetary gear 109 and the third-stage inner ring gear 111 to rotate, and the third-stage inner ring gear 111 drives the actuator to rotate.

[0068] When the mother motor 401 fails, the sub-motor 402 starts to run, and the output end of the sub-motor shaft 4021 drives the connecting spline 405, the idler gear 403 and the transmission gear 404 to rotate in sequence, and the transmission gear 404 drives the mother motor shaft 4011 to rotate. Afterwards, the output end of the mother motor shaft 4011 drives the first-stage sun gear shaft 101 to rotate, the first-stage sun gear shaft 101 drives the first-stage planetary gears 102 and the first-stage planetary carrier 103 to rotate, the first-stage planetary carrier 103 drives the second-stage sun gear shaft 104 to rotate, the second-stage sun gear shaft 104 drives the second-stage planetary gears 05 and the second-stage planetary carrier 106 to rotate, the second-stage planetary carrier 106 drives the third-stage sun gear shaft 108 to rotate, the third-stage sun gear shaft 108 drives the third-stage planetary gears 109 and the third-stage inner ring gear 111 to rotate, and the third-stage inner ring gear 111 drives the actuator to rotate.

[0069] This embodiment also provides a mixer truck, including a mixing tank and other mechanisms that existing mixer trucks have. Since the present invention does not involve these mechanisms, they will not be described in detail.

[0070] The mixing tank is driven by the electric drive assembly of the present invention. When the reducer is installed on the mixing tank, several screw holes are provided in the mixing tank's mounting locations. These screw holes mate with mounting holes 117 on the third-stage inner gear ring 111. Bolts are inserted through mounting holes 117 and tightened into the screw holes to complete the installation of the electric drive assembly and the mixing tank. When the electric drive assembly is in operation, the third-stage inner gear ring 111 drives the mixing tank to rotate.

[0071] Due to the mixing tank's requirements, the electric drive assembly is positioned at a 15° angle to the horizontal, with the oil level in the high-speed oil chamber lower than the low-speed oil chamber. When the reducer is running, the oil level in the high-speed oil chamber is low, allowing the planetary carrier to operate at high speeds, while the oil level in the low-speed oil chamber is high, allowing the planetary gears to mesh.

[0072] In other embodiments, the driving device in the electric drive assembly may adopt an ordinary motor, which can also achieve the purpose of the present invention.

[0073] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A reducer, characterized in that: include: case; A first-stage gear transmission mechanism is disposed in the housing and comprises a first-stage sun gear shaft (101), a first-stage planetary gear (102), a first-stage planetary carrier (103) and a first-stage inner gear ring, wherein the first-stage inner gear ring is fixedly connected to the inner wall of the housing; A second-stage gear transmission mechanism is disposed in the housing and is in transmission connection with the first-stage gear transmission mechanism, comprising a second-stage sun gear shaft (104), second-stage planetary gears (105), a second-stage planetary carrier (106), and a second-stage inner gear ring (107), wherein the second-stage inner gear ring (107) is fixed to the housing; a third-stage gear transmission mechanism, disposed in the housing and in transmission connection with the second-stage gear transmission mechanism, comprising a third-stage sun gear shaft (108), a third-stage planetary gear (109), a third-stage planetary carrier (110), and a third-stage inner gear ring (111); the third-stage planetary carrier (110) is fixedly connected to the housing; and the third-stage inner gear ring (111) is a power output component of the reducer; A sealing mechanism is provided between the second-stage planetary mechanism and the third-stage planetary mechanism, wherein the sealing mechanism divides the interior of the reducer into a high-speed oil chamber and a low-speed oil chamber; The high-speed oil chamber and the low-speed oil chamber are used to be filled with lubricating oil for independent lubrication and heat dissipation, and the oil level line in the high-speed oil chamber is lower than that in the low-speed oil chamber; The sealing mechanism comprises at least a second oil seal (303) and a third oil seal (304), wherein the second oil seal (303) is used for sealing between the third-stage sun gear shaft (108) and the fixed part of the housing, and the third oil seal (304) is used for sealing between the third-stage inner gear ring (111) and the fixed part of the housing.

2. The reducer according to claim 1, characterized in that: The first-stage planetary gear (102) is arranged between the first-stage sun gear shaft (101) and the first-stage inner gear ring and meshes with the first-stage sun gear shaft (101) and the first-stage inner gear ring; The second-stage sun gear shaft (104) is fixedly connected to the first-stage planet carrier (103); the second-stage planetary gear (105) is arranged between the second-stage sun gear shaft (104) and the second-stage inner gear ring (107) and meshes with the second-stage sun gear shaft (104) and the second-stage inner gear ring (107); The third-stage sun gear shaft (108) is fixedly connected to the second-stage planet carrier (106), and the third-stage planetary gear (109) is arranged between the third-stage sun gear shaft (108) and the third-stage inner gear ring (111) and meshes with the third-stage sun gear shaft (108) and the third-stage inner gear ring (111).

3. The reducer according to claim 2, characterized in that: The portion where the first-stage sun gear shaft (101) meshes with the first-stage planetary gear (102) is a helical gear portion (1011).

4. The reducer according to claim 3, characterized in that: The middle portion of the first-stage sun gear shaft (101) is connected to the housing via a first-stage supporting member; the middle portion of the second-stage planet carrier (106) is connected to the housing via a second-stage supporting member; and an axial limiting member is sleeved at the connection between the second-stage sun gear shaft (104) and the first-stage planet carrier (103).

5. The reducer according to any one of claims 1 to 4, characterized in that: The housing further comprises a first fixing seat (201) and a second fixing seat (202), wherein the first fixing seat (201), the side wall of the second-stage inner gear ring (107), the second fixing seat (202) and the side wall of the third-stage inner gear ring (111) are sealed and connected in sequence to form the housing.

6. An electric drive assembly, characterized in that: It comprises a driving device (4) and a reducer according to any one of claims 1 to 5, wherein the output shaft of the driving device (4) is fixedly connected to the first-stage sun gear shaft (101) of the reducer.

7. The electric drive assembly according to claim 6, characterized in that: The driving device (4) adopts a parent-child motor.

8. The electric drive assembly according to claim 7, characterized in that: The parent-child motor comprises a parent motor (401) and a child motor (402); the output end of the parent motor shaft (4011) is fixedly connected to the first-stage sun gear shaft (101); and the input end of the parent motor shaft (4011) is meshedly connected to the output end of the child motor shaft (4021) via an idler gear (403).

9. A mixer truck, characterized in that: It comprises a stirring tank, which is driven by the electric drive assembly according to any one of claims 6 to 8.

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