Reduction gear, electric drive system and vehicle

Abstract

The application belongs to the technical field of vehicles, and particularly relates to a reducer, an electric driving system and a vehicle. The reducer comprises a shell, the shell is provided with an input shaft bearing hole and an air outlet hole, the shell is provided with an oil stirring cavity, an oil collecting cavity and an air outlet channel inside, the oil collecting cavity is arranged below the input shaft bearing hole, the oil collecting cavity is communicated with the oil stirring cavity, one end of the air outlet channel is communicated with the oil collecting cavity, and the other end of the air outlet channel is communicated with the air outlet hole. The reducer, the electric driving system and the vehicle can reduce the oil stirring space, reduce the oil stirring amount and reduce the oil stirring loss.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vehicles, and particularly relates to a reducer, an electric drive system and a vehicle. BACKGROUND

[0002] The oil-cooled electric drive system assembly includes a motor and a reducer, and is one of key devices of a new energy vehicle. At present, research and development subjects are committed to integrating the motor and the reducer to realize lightweight, improve the cooling performance of the motor and the reducer assembly, ensure stable operation of the assembly, reduce the negative influence of high temperature on the motor and the reducer, improve the lubrication effect of the reducer and prolong the service life.

[0003] At present, the lubrication mode of the reducer in the oil-cooled electric drive system assembly on the market is mainly splash lubrication, and the active lubrication scheme is mainly a combination scheme of active lubrication and splash lubrication.

[0004] However, in the prior art, the reducer has the problem of efficiency loss, and the efficiency loss of the reducer is mainly oil stirring loss and friction loss, and the oil stirring loss accounts for a large proportion. SUMMARY

[0005] To solve the above technical problems, the present application provides a reducer, an electric drive system and a vehicle, which aims to at least solve the technical problem of large oil stirring loss of the reducer.

[0006] The technical scheme of the present application is as follows:

[0007] A reducer, characterized in that it comprises: a shell; the shell is provided with an input shaft bearing hole and an air outlet hole, and the shell is provided with an oil stirring cavity, an oil collecting cavity and an air outlet passage inside; wherein the oil collecting cavity is arranged below the input shaft bearing hole, the oil collecting cavity is communicated with the oil stirring cavity, one end of the air outlet passage is communicated with the oil collecting cavity, and the other end of the air outlet passage is communicated with the air outlet hole.

[0008] In some embodiments, the reducer further comprises: a separation assembly arranged in the shell to form the air outlet passage.

[0009] In some embodiments, the reducer further comprises: at least two oil blocking assemblies connected with the shell and the separation assembly and arranged in the air outlet passage at intervals; wherein the at least two oil blocking assemblies divide the air outlet passage into at least three sub-passages, a first sub-passage of the at least three sub-passages is communicated with the oil collecting cavity, a last sub-passage of the at least three sub-passages is communicated with the air outlet hole, and each two adjacent sub-passages of the at least three sub-passages are communicated.

[0010] In some embodiments, a third through hole is formed in each of the oil blocking components, and every two adjacent sub-channels in the at least three sub-channels are communicated through the third through hole.

[0011] In some embodiments, a fourth through hole is formed in the middle of the partition component and communicated with the air outlet channel and the oil stirring cavity.

[0012] In some embodiments, an oil collecting groove is formed in the housing and communicated with the air outlet channel and located at the lowest position of the air outlet channel.

[0013] In some embodiments, the speed reducer further comprises a first oil blocking member arranged in the housing to form the oil collecting cavity, a first through hole and a second through hole are formed in the first oil blocking member, the first through hole is communicated with the oil collecting cavity and the oil stirring cavity, and the second through hole is communicated with the oil collecting cavity and the air outlet channel.

[0014] In some embodiments, an intermediate shaft bearing hole and a differential bearing hole are formed in the housing, and the speed reducer further comprises a second oil blocking member arranged in the housing and a third oil blocking member arranged in the housing and located between the second oil blocking member and the intermediate shaft bearing hole, wherein the second oil blocking member and the third oil blocking member are spaced apart to form an oil supply channel communicated with the input shaft bearing hole, and the third oil blocking member has an arc-shaped cross section and extends towards the differential bearing hole.

[0015] Based on the same inventive concept, the application also provides an electric drive system comprising the speed reducer.

[0016] Based on the same inventive concept, the application also provides a vehicle comprising the electric drive system.

[0017] The application has at least the following beneficial effects:

[0018] Since the housing is provided with the input shaft bearing hole and the air outlet hole, and the housing is provided with the oil stirring cavity, the oil collecting cavity and the air outlet channel, the lubricating oil in the housing can enter the oil collecting cavity, part of the lubricating oil is contained in the oil collecting cavity to reduce the oil amount of the lubricating oil in the oil stirring cavity, the oil stirring efficiency can be improved, the oil stirring loss can be reduced, and the efficiency loss of the speed reducer can be reduced. At the same time, the oil collecting cavity can occupy part of the space in the housing to reduce the space occupied by the oil stirring cavity, reduce the oil stirring space, further improve the oil stirring efficiency, reduce the oil stirring loss, and reduce the efficiency loss of the speed reducer. The air outlet channel can also occupy part of the space in the housing to reduce the space occupied by the oil stirring cavity, reduce the oil stirring space, further improve the oil stirring efficiency, reduce the oil stirring loss, and reduce the efficiency loss of the speed reducer.

[0019] Because the oil collecting chamber is located below the input shaft bearing hole and is connected to the oil stirring chamber, and one end of the venting channel is connected to the oil collecting chamber and the other end is connected to the venting hole, the temperature inside the oil stirring chamber rises during oil stirring, causing the lubricating oil to vaporize into oil mist. At the same time, the gas volume inside the oil stirring chamber increases. To ensure stable pressure inside the oil stirring chamber, venting is required. The gas and oil mist inside the oil stirring chamber enter the oil collecting chamber and then enter the venting channel. The venting channel extends the venting path, and the oil mist gradually cools inside the venting channel to form liquid lubricating oil. Under the action of gravity, the lubricating oil flows to the lowest point of the venting channel to prevent lubricating oil from being discharged, thus ensuring the amount of lubricating oil in the housing. The gas is discharged through the venting hole, ensuring stable pressure inside the oil stirring chamber. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the reducer in this embodiment;

[0022] Figure 2 for Figure 1 Side view of the intermediate speed reducer;

[0023] Figure 3 for Figure 1 A schematic diagram of the structure of the first housing of the intermediate speed reducer;

[0024] Figure 4 for Figure 1 A schematic diagram of the structure of the second housing of the intermediate speed reducer.

[0025] In the attached image:

[0026] Housing 10, oil stirring chamber 101, oil collecting chamber 102, air outlet channel 103, sub-channel 1031, input shaft bearing hole 104, fifth through hole 1041, air outlet hole 105, first housing 106, second housing 107, oil collecting groove 108, intermediate shaft bearing hole 109, differential bearing hole 1010.

[0027] Separator assembly 20, first separator 201, second separator 202, fourth through hole 203;

[0028] Oil baffle assembly 30, fourth oil baffle 301, fifth oil baffle 302, third through hole 303;

[0029] First oil baffle 40, first through hole 401; second through hole 402;

[0030] The second oil baffle 50;

[0031] The third oil baffle 60. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort fall within the protection scope of the present application.

[0033] It should be noted that all directionality indications in the embodiments of the present application are only used to explain the relative positional relationship and movement condition between components in a certain posture, and if the certain posture changes, the directionality indications also change accordingly.

[0034] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal connection of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] In addition, in the present application, the description such as "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope claimed by the present application.

[0036] The present application will be described below in conjunction with the drawings and with reference to specific embodiments:

[0037] The reducer, electric drive system and vehicle provided in the embodiments aim to at least solve the technical problem of large oil mixing loss of the reducer to some extent.

[0038] Figure 1 The structural schematic diagram of the reducer of the present embodiment is shown in the figure; Figure 2 The structural schematic diagram of the reducer of the present embodiment is shown in the figure; Figure 1 The side view of the reducer of the present embodiment is shown in the figure;Figure 3 is Figure 1 a structural schematic view of a first housing of a reducer; Figure 4 is Figure 1 a structural schematic view of a second housing of a reducer. In combination with Figure 1 , Figure 2 , Figure 3 and Figure 4 , the reducer of the embodiment comprises a housing 10. The housing 10 is provided with an input shaft bearing hole 104 and an air outlet hole 105, and is provided with an oil stirring cavity 101, an oil collecting cavity 102 and an air outlet passage 103 inside. The oil collecting cavity 102 is arranged below the input shaft bearing hole 104, is in communication with the oil stirring cavity 101, and the air outlet passage 103 is in communication with the oil collecting cavity 102 at one end and with the air outlet hole 105 at the other end.

[0039] Since the housing 10 is provided with the input shaft bearing hole 104 and the air outlet hole 105, and is provided with the oil stirring cavity 101, the oil collecting cavity 102 and the air outlet passage 103 inside, the lubricating oil inside the housing 10 can enter the oil collecting cavity 102, part of the lubricating oil is contained by the oil collecting cavity 102, so as to reduce the oil amount of the lubricating oil in the oil stirring cavity 101, improve the oil stirring efficiency and reduce the oil stirring loss, thereby reducing the efficiency loss of the reducer. At the same time, the oil collecting cavity 102 can occupy part of the space inside the housing 10, so as to reduce the space occupied by the oil stirring cavity 101, reduce the oil stirring space, further improve the oil stirring efficiency, reduce the oil stirring loss, and reduce the efficiency loss of the reducer. The air outlet passage 103 can also occupy part of the space inside the housing 10, so as to reduce the space occupied by the oil stirring cavity 101, reduce the oil stirring space, further improve the oil stirring efficiency, reduce the oil stirring loss, and reduce the efficiency loss of the reducer.

[0040] Since the oil collecting cavity 102 is arranged below the input shaft bearing hole 104, is in communication with the oil stirring cavity 101, and the air outlet passage 103 is in communication with the oil collecting cavity 102 at one end and with the air outlet hole 105 at the other end, when the oil stirring is performed, the temperature in the oil stirring cavity 101 rises, the lubricating oil is gasified into oil mist, and at the same time, the volume of the gas in the oil stirring cavity 101 increases. In order to ensure the stability of the pressure in the oil stirring cavity 101, the exhaust is needed to be performed. The gas and the oil mist in the oil stirring cavity 101 enter the oil collecting cavity 102 and then enter the air outlet passage 103. The exhaust path is prolonged by the air outlet passage 103. The oil mist is gradually cooled in the air outlet passage 103 to form liquid lubricating oil. Under the action of gravity, the lubricating oil flows to the lowest part of the air outlet passage 103 to avoid the lubricating oil from being discharged, so as to ensure the oil amount of the lubricating oil inside the housing 10, and the gas is discharged through the air outlet hole 105 to ensure the stability of the pressure in the oil stirring cavity 101.

[0041] In combination with Figure 1 , Figure 2 ,Figure 3 and Figure 4 In some embodiments, in order to form the oil stirring cavity 101, the housing 10 comprises: a first housing 106 and a second housing 107. The second housing 107 is connected with the first housing 106 to form the oil stirring cavity 101.

[0042] In combination Figure 3 and Figure 4 In some embodiments, in order to form the gas outlet passage 103, the speed reducer further comprises: a partition assembly 20 arranged in the housing 10 to form the gas outlet passage 103.

[0043] In combination Figure 3 and Figure 4 In some embodiments, one end of the partition assembly 20 is connected with the end surface of the first housing 106 facing the second housing 107, and the other end is connected with the end surface of the second housing 107 facing the first housing 106, and the partition assembly 20 is spaced apart from the inner side walls of the first housing 106 and the second housing 107 to form the gas outlet passage 103.

[0044] In combination Figure 3 and Figure 4 In some embodiments, the partition assembly 20 comprises: a first partition piece 201 and a second partition piece 202. One end of the first partition piece 201 is connected with the end surface of the first housing 106 facing the second housing 107, and the other end is connected with the second partition piece 202, and the second partition piece 202 is connected with the end surface of the second housing 107 facing the first housing 106.

[0045] In some embodiments, the first partition piece 201 is connected with the second partition piece 202 to separate the gas outlet passage 103 from the oil stirring cavity 101.

[0046] In some embodiments, the cross-sectional shape of the first partition piece 201 and the second partition piece 202 can be arc-shaped to prolong the exhaust path.

[0047] In combination Figure 3 and Figure 4 In some embodiments, in order to form a labyrinth structure for the gas outlet passage 103, the speed reducer further comprises: at least two oil blocking assemblies 30. The at least two oil blocking assemblies 30 are connected with the housing 10 and the partition assembly 20 and are arranged in the gas outlet passage 103 at intervals. Among them, the at least two oil blocking assemblies 30 divide the gas outlet passage 103 into at least three sub-passages 1031, the first sub-passage of the at least three sub-passages 1031 communicates with the oil collecting cavity 102, the last sub-passage of the at least three sub-passages 1031 communicates with the gas outlet hole 105, and each two adjacent sub-passages of the at least three sub-passages 1031 communicate. The number of oil blocking assemblies 30 can be two or more.

[0048] In some embodiments, the oil blocking assembly 30 blocks the oil mist and gas when the oil mist and gas enter from one of the at least three sub-channels 1031 into the sub-channel adjacent to the sub-channel, so that the oil mist has time to cool and form liquid lubricating oil, which flows to the lowest part of the gas outlet channel 103 under the action of gravity, so as to avoid the lubricating oil from being discharged and ensure the amount of lubricating oil in the shell 10, while the gas is discharged through the gas outlet hole 105 to ensure the stability of the pressure in the oil stirring cavity 101.

[0049] In combination Figure 3 and Figure 4 In some embodiments, the oil blocking assembly 30 comprises a fourth oil blocking piece 301 and a fifth oil blocking piece 302. One end of the fourth oil blocking piece 301 is connected to the inner side wall of the first shell 106, the other end is connected to the first partition 201, and the fourth oil blocking piece 301 is connected to the end face of the first shell 106 facing the second shell 107. One end of the fifth oil blocking piece 302 is connected to the inner side wall of the second shell 107, the other end is connected to the second partition 202, and the fifth oil blocking piece 302 is connected to the end face of the second shell 107 facing the first shell 106. The fifth oil blocking piece 302 is in abutment with the fourth oil blocking piece 301.

[0050] In combination Figure 3 and Figure 3 In some embodiments, a third through hole 303 is formed in each oil blocking assembly 30, and each two adjacent sub-channels of the at least three sub-channels 1031 are communicated through the third through hole 303, so that the oil mist and gas can enter from one of the at least three sub-channels 1031 into the sub-channel adjacent to the sub-channel.

[0051] In some embodiments, the fourth oil blocking piece 301 is provided with a first gap, and the fifth oil blocking piece 302 is provided with a second gap. When the fifth oil blocking piece 302 is in abutment with the fourth oil blocking piece 301, the first gap is opposite to the second gap to form the third through hole 303.

[0052] In combination Figure 4 In some embodiments, in order to further ensure the stability of the pressure in the oil stirring cavity 101, a fourth through hole 203 is formed in the middle of the partition assembly 20 and communicated with the gas outlet channel 103 and the oil stirring cavity 101.

[0053] In some embodiments, when the oil is stirred, the temperature in the stirring cavity 101 rises, and the lubricating oil is vaporized into oil mist. At the same time, the volume of gas in the stirring cavity 101 increases. In order to ensure that the pressure in the stirring cavity 101 is stable, exhaust is needed. The lubricating oil, gas and oil mist in the stirring cavity 101 can enter the gas outlet channel 103 through the fourth through hole 203. The exhaust path is extended through the gas outlet channel 103. The oil mist will gradually cool down in the gas outlet channel 103 to form liquid lubricating oil. Under the action of gravity, the lubricating oil flows to the lowest part of the gas outlet channel 103 to avoid the lubricating oil being discharged, thereby ensuring the oil amount of the lubricating oil in the shell 10, and the gas is discharged through the gas outlet hole 105 to ensure that the pressure in the stirring cavity 101 is stable.

[0054] In combination Figure 3 and Figure 3 In some embodiments, the first partition 201 is provided with a third gap, and the second partition 202 is provided with a fourth gap. When the first partition 201 and the second partition 202 are connected, the third gap and the fourth gap are opposite to each other to form the fourth through hole 203.

[0055] In combination Figure 3 In some embodiments, the oil mist gradually cools down in the gas outlet channel 103 to form liquid lubricating oil. In order to ensure that the temperature of the liquid lubricating oil meets the requirements, the shell 10 is provided with an oil collecting groove 108. The oil collecting groove 108 is in communication with the gas outlet channel 103 and is located at the lowest part of the gas outlet channel 103.

[0056] In some embodiments, the oil mist gradually cools down in the gas outlet channel 103 to form liquid lubricating oil. Under the action of gravity, the liquid lubricating oil flows into the oil collecting groove 108, and the liquid lubricating oil is collected through the oil collecting groove 108. The liquid lubricating oil can be cooled in the oil collecting groove 108, so that the liquid lubricating oil has a certain cooling time, thereby ensuring that the temperature of the lubricating oil meets the requirements.

[0057] In combination Figure 3 In some embodiments, in order to form the oil collecting cavity 102, the speed reducer further comprises a first oil blocking piece 40. The first oil blocking piece 40 is arranged in the shell 10 to form the oil collecting cavity 102. The first oil blocking piece 40 is provided with a first through hole 401 and a second through hole 402. The first through hole 401 is in communication with the oil collecting cavity 102 and the stirring cavity 101. The second through hole 402 is in communication with the oil collecting cavity 102 and the gas outlet channel 103.

[0058] In some embodiments, the lubricating oil, gas and / or oil mist in the stirring cavity 101 enters the oil collecting cavity 102 through the first through hole 401. The gas and / or oil mist in the oil collecting cavity 102 can enter the gas outlet channel 103 through the second through hole 402.

[0059] In combinationFigure 3 In some embodiments, the height of the second through hole 402 is greater than the lowest part of the gas outlet channel 103, so that the liquid lubricating oil can be cooled in the oil collecting groove 108, so that the liquid lubricating oil has a certain cooling time, and the temperature of the lubricating oil meets the requirements. When the amount of lubricating oil in the oil collecting groove 108 is too much, it can enter the oil collecting cavity 102 through the second through hole 402.

[0060] In combination Figure 3 In some embodiments, the first through hole 401 and the second through hole 402 are respectively located on both sides of the partition assembly 20, so that the lubricating oil, gas and / or oil mist in the oil stirring cavity 101 can enter the oil collecting cavity 102 through the first through hole 401, and the gas and / or oil mist in the oil collecting cavity 102 can enter the gas outlet channel 103 through the second through hole 402.

[0061] In some embodiments, in order to ensure that the input shaft and the differential shaft in the housing 10 can be lubricated, the housing 10 is provided with an intermediate shaft bearing hole 109 and a differential shaft bearing hole 1010, and the reducer further comprises a second oil blocking piece 50 and a third oil blocking piece 60. The second oil blocking piece 50 is arranged in the housing 10. The third oil blocking piece 60 is arranged in the housing 10 and located between the second oil blocking piece 50 and the intermediate shaft bearing hole 109. The second oil blocking piece 50 and the third oil blocking piece 60 are spaced apart to form an oil supply channel communicating with the input shaft bearing hole 104, and the cross-sectional shape of the third oil blocking piece 60 is arc-shaped and extends towards the differential shaft bearing hole 1010.

[0062] In combination Figure 3 In some embodiments, when the intermediate shaft rotates in the intermediate shaft bearing hole 109, the intermediate shaft drives the gear to stir the oil, and the lubricating oil can splash to the lower surface of the second oil blocking piece 50. Under the action of gravity, the lubricating oil flows to the upper surface of the third oil blocking piece 60. The lubricating oil enters the input shaft bearing hole 104 through the oil supply channel to lubricate the input shaft in the housing 10, so as to ensure the normal work of the input shaft. At the same time, the lubricating oil can also splash to the lower surface of the third oil blocking piece 60 and be guided by the third oil blocking piece 60, so that the lubricating oil can fly to the differential shaft bearing hole 1010 to lubricate the differential shaft in the housing 10, so as to ensure the normal work of the differential shaft.

[0063] In combination ​ In some embodiments, a fifth through hole 1041 is formed in the hole wall of the input shaft bearing hole 104, and the oil supply channel communicates with the fifth through hole 1041, so that the lubricating oil can enter the input shaft bearing hole 104.

[0064] In combination ​In some embodiments, the third oil baffle 60 has a width smaller than that of the second oil baffle 50, so that the third oil baffle 60 does not completely block the second oil baffle 50, and the lubricating oil stirred by the rotation of the intermediate shaft can reach the second oil baffle 50.

[0065] Based on the same inventive concept, the application further provides an electric drive system, which adopts the reducer, the specific structure of which is referred to the above embodiments, and since the top plate structure adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0066] Based on the same inventive concept, the application further provides a vehicle, which adopts the electric drive system, the specific structure of which is referred to the above embodiments, and since the top plate structure adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0067] In the description of the present application, 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" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0068] In the description of the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0069] In the description of the application, reference is made to descriptive terms such as "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" meant to connote "one" or "some" but not "the only" structure, workflow, composition, arrangement, procedure, configuration, property, or relation described in the examples. This structural elucidation is for the purposes of providing an example of and a basis for patentable subject matter, but is not necessarily encompassed by the examples described. Moreover, the specific features, structures, components, or characteristics described in the application can be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art will recognize that the described embodiments or examples can be practiced with steps in different orders, and that certain functions have not been described in detail, but would still encompassed by the examples described. In addition, the described embodiments or examples can be combined in any suitable manner.

[0070] Although preferred embodiments of the application have been described herein, those skilled in the art will readily devise many other variations of these embodiments that will be within the scope of the present application. Accordingly, the appended claims are intended to encompass all such variations as falling within the scope of the application.

[0071] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A speed reducer, characterized in that, Includes the casing; The housing has an input shaft bearing hole and an air outlet hole, and the housing is provided with an oil stirring chamber, an oil collecting chamber and an air outlet channel; The oil collecting chamber is located below the input shaft bearing hole and is connected to the oil stirring chamber. One end of the air outlet channel is connected to the oil collecting chamber and the other end is connected to the air outlet. The reducer also includes: A first oil baffle is disposed inside the housing to form the oil collecting chamber. The first oil baffle has a first through hole and a second through hole. The first through hole communicates with the oil collecting chamber and the oil stirring chamber, and the second through hole communicates with the oil collecting chamber and the air outlet channel.

2. The reducer according to claim 1, characterized in that, The reducer also includes: A separator is disposed within the housing to form the air outlet passage.

3. The reducer according to claim 2, characterized in that, The reducer also includes: At least two oil baffle assemblies are connected to the housing and the partition assembly and are spaced apart within the air outlet passage; Wherein, at least two of the oil baffle components divide the air outlet channel into at least three sub-channels, the first of the at least three sub-channels is connected to the oil collection chamber, the last of the at least three sub-channels is connected to the air outlet, and every two adjacent sub-channels of the at least three sub-channels are connected.

4. The reducer according to claim 3, characterized in that, Each of the oil baffle components is provided with a third through hole, and at least two adjacent sub-channels in the three sub-channels are connected through the third through hole.

5. The reducer according to claim 2, characterized in that, The middle part of the separator component has a fourth through hole that communicates with the air outlet channel and the oil stirring chamber.

6. The reducer according to claim 2, characterized in that, An oil collection groove is provided inside the housing, which is connected to the air outlet channel and is located at the lowest point of the air outlet channel.

7. The reducer according to any one of claims 1-6, characterized in that, The housing has an intermediate shaft bearing hole and a differential bearing hole, and the reducer also includes: The second oil baffle is located inside the housing; The third oil baffle is disposed inside the housing and located between the second oil baffle and the intermediate shaft bearing hole; There is a gap between the second oil baffle and the third oil baffle to form an oil supply channel communicating with the input shaft bearing hole. The cross-sectional shape of the third oil baffle is arc-shaped and extends towards the differential bearing hole.

8. An electric drive system, characterized in that, Includes the speed reducer as described in any one of claims 1-7.

9. A vehicle, characterized in that, Including the electric drive system as described in claim 8.

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