Speed reducer and vehicle

Abstract

The speed reducer comprises a shell, a differential mechanism and a speed reduction gear train, the shell is provided with an oil collecting cavity and an oil discharging port which are communicated, the differential mechanism comprises a gear ring and a differential shell, the gear ring is arranged in the shell and can throw lubricating oil into the oil collecting cavity, and the differential shell is fixedly arranged on the gear ring and is provided with a side window hole. The speed reduction gear train comprises a first speed reduction gear and an oil throwing part, the first speed reduction gear is rotatably arranged in the shell and connected with the gear ring, and the oil throwing part is connected with the first speed reduction gear and used for throwing lubricating oil discharged from the oil discharge outlet into the side window hole in the rotating process of the first speed reduction gear.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, in particular to a speed reducer and a vehicle. Background Art

[0002] The differential is an important part of the vehicle drive assembly and is used in combination with a gear set to form a speed reducer. Traditional differential lubrication schemes include active oil pumping lubrication and oil stirring lubrication. The former requires the arrangement of an oil pump and oil pipes in the speed reducer housing, which is costly and takes up a large amount of space, increasing the difficulty of the development and design of the speed reducer. The latter requires a large amount of lubricating oil, and the planetary gears and half-axle gears in the differential are immersed in the lubricating oil, increasing the running resistance of the differential and being unfavorable for reducing the power consumption of the vehicle. Summary of the Utility Model

[0003] In view of this, the utility model provides a speed reducer and a vehicle with low cost, easy implementation, and capable of reducing the running resistance of the differential, thereby reducing the power consumption of the vehicle.

[0004] The speed reducer of the utility model includes a housing, a differential, and a reduction gear train. The housing is configured with an oil collecting cavity and an oil drain port that are connected and communicated. The differential includes a ring gear and a differential case. The ring gear is disposed in the housing and can throw lubricating oil into the oil collecting cavity. The differential case is fixedly disposed on the ring gear and is provided with side window holes. The reduction gear train includes a first reduction gear and an oil throwing portion. The first reduction gear is rotatably disposed in the housing and is connected to the ring gear. The oil throwing portion is connected to the first reduction gear and is used for throwing the lubricating oil discharged from the oil drain port into the side window holes during the rotation of the first reduction gear.

[0005] In some embodiments, the housing is further configured with a gear cavity for accommodating the differential and the reduction gear train. The gear cavity includes an oil chamber. The tooth trace of the ring gear passes through the inlet of the oil collecting cavity and the oil chamber.

[0006] In some embodiments, the inlet of the oil collecting cavity is formed at one end of the oil collecting cavity that is relatively far from the oil chamber, and the other end of the oil collecting cavity that is relatively close to the oil chamber is communicated with the oil drain port.

[0007] In some embodiments, the reduction gear train further includes a second reduction gear connected to the first reduction gear. The second reduction gear is used for connecting an external power source. The oil throwing portion includes the teeth of the second reduction gear, and the tooth trace of the second reduction gear passes through the oil drain port.

[0008] In some embodiments, the differential case is coaxially connected to the ring gear. The ring gear meshes with the first reduction gear. The second reduction gear is coaxially and fixedly connected to the first reduction gear. The oil throwing portion is located on the outer peripheral side of the differential case and is spaced apart from the differential case.

[0009] In some embodiments, the reduction gear train further includes an input gear rotatably disposed within the housing. The second reduction gear meshes with the input gear. The input gear is connected to an external power source and is capable of transmitting the power of the external power source to the second reduction gear.

[0010] In some embodiments, the oil slinger includes an oil slinger rod and oil slinger vanes. The oil slinger rod is fixedly connected to the first reduction gear. The oil slinger vanes are disposed on the oil slinger rod. The first reduction gear is used to connect to an external power source, and the oil slinger rod and the oil slinger vanes can be driven by the first reduction gear to rotate.

[0011] In some embodiments, the rotation trajectory of the oil slinger vanes passes through the oil drain port.

[0012] In some embodiments, the differential case is coaxially connected to the ring gear. The ring gear meshes with the first reduction gear. The oil slinger vanes are located on the outer peripheral side of the differential case and are spaced apart from the differential case.

[0013] In some embodiments, the reduction gear train further includes an input gear rotatably disposed within the housing. The input gear meshes with the first reduction gear and is connected to an external power source.

[0014] In some embodiments, the housing further constructs a gear chamber for accommodating the differential and the reduction gear train, and further includes a partition rib for separating the oil sump and the gear chamber. The partition rib includes an oil guiding rib, wherein

[0015] The oil guiding rib is disposed on the outer peripheral side of the ring gear and extends along the circumferential direction of the ring gear; and / or,

[0016] One end of the oil guiding rib extends towards the oil drain port, and the other end is spaced apart from the top wall of the gear chamber to form an inlet of the oil sump.

[0017] In some embodiments, the housing further constructs a bent flow channel. One end of the bent flow channel communicates with the oil sump, and the other end of the bent flow channel forms the oil drain port.

[0018] In some embodiments, a first partition rib and a second partition rib are provided within the housing. The bent flow channel includes an upstream section located on the side of the first partition rib away from the second partition rib, and further includes a downstream section located between the first partition rib and the second partition rib. The liquid gap between the first partition rib and the inner wall of the housing communicates the upstream section and the downstream section. The upstream section communicates with the oil sump, and the oil drain port is formed in the downstream section.

[0019] In some embodiments, the housing includes a side cover and a hollow housing formed by separate molding. The hollow housing has a through hole communicating with the inner cavity of the hollow housing. The side cover is disposed outside the hollow housing and covers the through hole. The side cover is used to form a part of the inner wall of the housing. A liquid gap is formed between the first partition rib and the side cover. The second partition rib extends to the opening edge of the through hole.

[0020] The vehicle of the present utility model includes a speed reducer.

[0021] Compared with the prior art, the beneficial effects of the reducer of the present utility model and the vehicle include:

[0022] The power required to supply lubricating oil to the differential directly comes from the reduction gear train and ultimately from the power source. Therefore, there is no need to arrange an oil pump. The lubricating oil is sequentially thrown into the side window holes by the oil throwing part after passing through the oil collecting cavity and the oil drain port. The oil circuit of the lubricating oil is simple, so there is no need to arrange an oil pipe. The development and design difficulty of the reducer is lower and the lubrication cost is reduced. The oil throwing part splashes the lubricating oil into the side window holes, achieving lubrication within a specific range inside the differential. There is no need to immerse the planetary gears, half-axle gears, etc. inside the differential in the lubricating oil. The amount of lubricating oil used and the running resistance of the differential are reduced, thereby reducing the power consumption of the vehicle. Description of the Drawings

[0023] Figure 1 Structural schematic diagram of the reducer according to an embodiment of the present utility model;

[0024] Figure 2 Analysis diagram of the lubrication principle of the reducer according to an embodiment of the present utility model;

[0025] Figure 3 is Figure 2 Partial enlarged schematic diagram;

[0026] Figure 4 Partial structural schematic diagram of the reducer according to an embodiment of the present utility model;

[0027] Figure 5 Cross-sectional view of the electric drive assembly according to an embodiment of the present utility model;

[0028] Figure 6 Cross-sectional view of the reducer according to an embodiment of the present utility model;

[0029] Figure 7 is Figure 6 Partial enlarged schematic diagram.

[0030] Description of the reference numerals:

[0031] 10. Housing; 101. Hollow housing; 11. Oil collecting cavity; 111. Oil collecting cavity inlet; 12. Gear cavity; 121. Oil chamber; 13. Bent flow channel; 130. Oil drain port; 131. Upstream section; 132. Downstream section; 14. Side cover; 15. Partition rib; 151. Oil guiding rib; 152. First partition rib; 153. Second partition rib; 154. Arc rib;

[0032] 20. Differential; 21. Ring gear; 22. Differential case; 221. Side window wall; 222. Side window hole; 23. Planetary gear; 24. Half-axle gear;

[0033] 30. Reduction gear train; 31. Input gear; 321. First reduction gear; 322. Second reduction gear;

[0034] 40. Power source. Detailed implementation manner

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0037] The present invention provides a speed reducer, and also provides a vehicle including the speed reducer, as Figure 5 shown, the speed reducer of the present invention can be connected to the power source 40 and operate in a supporting manner to form an electric drive assembly of the vehicle. The power source 40 can be a drive motor, which is used to provide the power required to rotate the drive wheels of the vehicle. The speed reducer is connected to the output shaft of the drive motor and the drive wheels of the vehicle. Through the speed reduction and torque increase function of the speed reducer, the torque of the drive wheels is increased compared with the output torque of the drive motor, and the speed of the drive wheels is reduced compared with the speed of the output shaft of the drive motor.

[0038] Refer to Figure 1 、 Figure 4 and Figure 6, the speed reducer of the present utility model includes a housing 10, a differential 20 and a reduction gear train 30. A gear cavity 12 is constructed inside the housing 10, and both the differential 20 and the reduction gear train 30 are disposed inside the gear cavity 12. The differential 20 includes a differential case 22, a ring gear 21, planet gears 23 and side gears 24. The differential case 22 is fixedly connected to one end of the ring gear 21. The ring gear 21 is rotatably installed inside the gear cavity 12. The planet gears 23 mesh with the side gears 24, and both the planet gears 23 and the side gears 24 are accommodated inside the differential case 22. The reduction gear train 30 is connected to a power source 40 and is used to transmit power to the ring gear 21. The reduction gear train 30 includes a first reduction gear 321 rotatably installed inside the gear cavity 12. In some embodiments, the first reduction gear 321 meshes with the ring gear 21. In some other embodiments, the reduction gear train 30 further includes an intermediate gear, and the first reduction gear 321 meshes with the intermediate gear to indirectly connect to the ring gear 21.

[0039] Refer to Figure 1 and Figure 4 , the reduction gear train 30 further includes an input gear 31 rotatably installed inside the gear cavity 12. The input gear 31 is connected to the power source 40 and the first reduction gear 321. When the power source 40 is a driving motor, the output shaft of the driving motor is coaxially and fixedly connected to the input gear 31. The power generated by the power source 40 is first input to the input gear 31, then the input gear 31 transmits the power to the first reduction gear 321, and then the first reduction gear 321 transmits the power to the ring gear 21. The differential case 22 rotates together with the ring gear 21. The planet gears 23 rotate relative to the differential case 22 and drive the side gears 24 to rotate. The side gears 24 are connected to a driving wheel, and thus the driving wheel obtains power from the differential 20.

[0040] In some embodiments, the gear cavity 12 includes an oil chamber 121 for storing lubricating oil. When the speed reducer is connected to the power source 40 to form an electric drive assembly and the electric drive assembly is installed in place in a vehicle, the oil chamber 121 is a part of the gear cavity 12 relatively close to the ground. Refer to Figure 1 , Figure 1 illustrates the positional relationship between the oil chamber 121 and the entire gear cavity 12, where the horizontal dashed line H represents the liquid level of the lubricating oil in the oil chamber 121 in a static state. A part of the ring gear 21 is immersed below the horizontal dashed line H. When the reduction gear train 30 obtains the power from the power source 40, the ring gear 21 is driven by the reduction gear train 30 to rotate. During the rotation of the ring gear 21, the tooth trajectory of the ring gear 21 passes through the oil chamber 121. Thus, a part of the lubricating oil in the oil chamber 121 can be carried into the tooth grooves of the ring gear 21.

[0041] The lubricating oil is not only used to lubricate the gear ring 21 and the reduction gear train 30 to ensure the efficient and smooth transmission of power from the reduction gear train 30 to the differential 20, but also used to lubricate the differential 20, specifically for lubricating the planetary gear 23 and the half shaft gear 24 in the differential housing 22. For this purpose, the reducer of the present utility model further defines that an oil collecting cavity 11 and an oil drain port 130 which are connected and communicated are further constructed in the housing 10, a side window hole 222 is opened in the differential housing 22, and the reduction gear train 30 further includes an oil throwing part connected to the first reduction gear 321. During the rotation of the input gear 31 and the first reduction gear 321, the gear ring 21 rotates and throws the lubricating oil located in the tooth grooves of the gear ring 21 into the oil collecting cavity 11. After the lubricating oil enters the oil collecting cavity 11, it flows towards the oil drain port 130, and the oil throwing part can throw the lubricating oil discharged from the oil drain port 130 into the side window hole 222. When the lubricating oil flows out from the oil drain port 130, the lubricating oil first drips onto the oil throwing part, and then the lubricating oil is thrown out by the oil throwing part and forms oil droplets flying towards the differential housing 22. After passing through the side window hole 222, the oil droplets sprinkle on the planetary gear 23 and the half shaft gear 24.

[0042] In some embodiments, the reduction gear train 30 further includes a second reduction gear 322 connected to the first reduction gear 321. The second reduction gear 322 meshes with the input gear 31 and thus is indirectly connected to the external power source 40. The oil throwing part includes the teeth of the second reduction gear 322. The oil throwing trajectory of the oil throwing part includes the tooth trajectory of the second reduction gear 322. The teeth of the second reduction gear 322 can receive the lubricating oil discharged from the oil drain port 130 and can throw the lubricating oil tangentially according to the second reduction gear 322. With such a setting, the lubricating oil can obtain a larger splash velocity vector after being thrown out by the second reduction gear 322, so that the lubricating oil splashes farther and can smoothly pass through the side window hole 222 and sprinkle on the planetary gear 23 and the half shaft gear 24.

[0043] Refer to Figure 4 and Figure 6 , the second reduction gear 322 is coaxially and fixedly connected to the first reduction gear 321. The first reduction gear 321 and the second reduction gear 322 are arranged axially in sequence. The differential housing 22 is coaxially connected to the gear ring 21. The differential housing 22 includes a side window wall 221 provided with a side window hole 222. The side window wall 221 is fixed to one end of the gear ring 21 and extends around the axis of the gear ring 21. The planetary gear 23 and the half shaft gear 24 are surrounded by the side window wall 221. The first reduction gear 321 meshes with the gear ring 21. The axis of the first reduction gear 321 is parallel to the axis of the gear ring 21. The axis of the side window wall 221 is parallel to the axis of the second reduction gear 322. The second reduction gear 322 is located outside the side window wall 221 and is spaced from the side window wall 221. With such a setting, the distance between the second reduction gear 322 and the side window wall 221 is basically constant, and the second reduction gear 322 can evenly throw the lubricating oil into the differential housing 22.

[0044] Optionally, as Figure 4 and Figure 6 shown, the radius of the second reduction gear 322 is greater than the radius of the input gear 31 and also greater than the radius of the first reduction gear 321, and the radius of the ring gear 21 is greater than the radius of the first reduction gear 321. With such a setting, the speed reducer achieves multi-stage reduction transmission and has a larger reduction ratio. The linear velocity of the teeth of the second reduction gear 322 is greater than the linear velocity of the teeth of the first reduction gear 321. Therefore, the teeth of the second reduction gear 322 as an oil-slinging part can better meet the requirement of long-distance splashing of lubricating oil. After the power source 40 is started, the power is transmitted to the driving wheel according to the following process: The power is first input to the input gear 31, then the input gear 31 transmits the power to the second reduction gear 322. Then, the first reduction gear 321 rotates synchronously with the second reduction gear 322 and transmits the power to the ring gear 21. Finally, the power is transmitted to the driving wheel through the planetary gear 23 and the half shaft gear 24. Finally, the rotational speed of the driving wheel is greatly reduced compared with the rotational speed of the output shaft of the power source 40, while the torque of the driving wheel is greatly increased compared with the output torque of the power source 40. The second reduction gear 322 has the functions of reducing speed and increasing torque and splashing lubricating oil towards the side window hole 222.

[0045] In some other embodiments, the second reduction gear 322 is not necessary. The input gear 31 is directly meshed with the first reduction gear 321, and the first reduction gear 321 is meshed with the ring gear 21. The power of the power source 40 is first transmitted to the input gear 31, then transmitted to the first reduction gear 321 through the input gear 31, then transmitted to the ring gear 21 through the first reduction gear 321, and finally transmitted to the driving wheel through the planetary gear 23 and the half shaft gear 24. The oil-slinging part includes an oil-slinging rod and oil-slinging blades. The oil-slinging rod is fixedly connected to the first reduction gear 321, and the oil-slinging blades are arranged on the oil-slinging rod. Both the oil-slinging rod and the oil-slinging blades can receive the lubricating oil discharged from the oil drain port 130. During the rotation of the input gear 31 and the first reduction gear 321, the oil-slinging rod and the oil-slinging blades can be driven by the first reduction gear 321 to rotate. Then, the oil-slinging blades are responsible for slinging out the lubricating oil, and the lubricating oil dripping on the oil-slinging rod can flow to the oil-slinging blades by centrifugal force and be slung out.

[0046] Optionally, the rotation trajectory of the oil-slinging blades following the rotation of the first reduction gear 321 passes through the oil drain port 130. With such a setting, it is more convenient for the oil-slinging blades to receive the lubricating oil discharged from the oil drain port 130.

[0047] Optionally, the differential case 22 is coaxially connected to the ring gear 21, and the oil-slinging blades are located on the outer peripheral side of the differential case 22 and are spaced from the differential case 22. With such a setting, the distance between the oil-slinging blades and the side window wall 221 is basically constant, and the oil-slinging part can evenly sling the lubricating oil into the differential case 22.

[0048] Refer to Figures 1 - 2, in some embodiments, the oil collecting cavity 11 has an oil collecting cavity inlet 111 that connects the gear cavity 12 and the oil collecting cavity 11. The oil collecting cavity inlet 111 is formed at one end of the oil collecting cavity 11 that is relatively far from the oil chamber 121. The other end of the oil collecting cavity 11 that is relatively close to the oil chamber 121 is connected to the oil drain port 130. When the reducer is installed in place on the vehicle and the vehicle is in a stationary state, the oil collecting cavity inlet 111 is higher than the oil drain port 130, and the oil collecting cavity 11 is located above the oil chamber 121. The tooth trace of the gear ring 21 passes through the oil collecting cavity inlet 111, and the lubricating oil carried in the tooth grooves of the gear ring 21 can be directly thrown into the oil collecting cavity inlet 111 as the gear ring 21 rotates. The lubricating oil has a tangential velocity vector tangent to the gear ring 21 at the moment it leaves the gear ring 21, and then the lubricating oil directly enters the oil collecting cavity 11 by virtue of the tangential velocity vector.

[0049] Specifically, the housing 10 further includes a partition rib 15. The partition rib 15 is used to separate the gear cavity 12 and the oil collecting cavity 11. The partition rib 15 includes an oil guiding rib 151 located on the outer peripheral side of the gear ring 21. One side of the oil guiding rib 151 forms a part of the inner wall surface of the gear cavity 12, and the other side of the oil guiding rib 151 is a guiding surface, which serves as a part of the inner wall surface of the oil collecting cavity 11. The oil guiding rib 151 generally extends approximately along the circumferential direction of the gear ring 21. Refer to Figures 1 - 2 , one end of the oil guiding rib 151 extends towards the top wall of the gear cavity 12 and is spaced from the top wall of the gear cavity 12 to form the oil collecting cavity inlet 111. The top wall of the gear cavity 12 and the bottom wall of the oil chamber 121 face each other. The other end of the oil guiding rib 151 extends along the direction close to the oil chamber 121 and the oil drain port 130. There is a very short gap between the oil guiding rib 151 and the tooth tip of the gear ring 21. Even when the gear ring 21 rotates at a low speed, the lubricating oil can still flow along the guiding surface towards the oil drain port 130 after entering the oil collecting cavity inlet 111. At this time, the flow trajectory of the lubricating oil along the guiding surface is as Figures 2 - 3 shown by the arrow A2 in.

[0050] The oil guiding rib 151 is used to guide the lubricating oil to flow quickly and efficiently from the oil collecting cavity inlet 111 to the oil drain port 130. Especially when the gear ring 21 rotates at a low speed, the oil guiding rib 151 can shorten the path of the lubricating oil flowing from the oil collecting cavity inlet 111 to the oil drain port 130, preventing the lubricating oil from breaking off due to too long a flow stroke. The arc-shaped oil guiding rib 151 can maximize the volume of the oil collecting cavity 11 and the gear cavity 12. When the rotational speed of the gear ring 21 increases, the flow rate of the lubricating oil entering the oil collecting cavity 11 increases, and the oil collecting cavity 11 can be filled with lubricating oil faster. When the lubricating oil fills the oil collecting cavity 11 and the internal pressure of the oil collecting cavity 11 rises, the lubricating oil is pressed into the oil drain port 130. In other embodiments, the oil guiding rib 151 does not have to be set as an arc shape, and can also be a flat rib segment or a rib segment of other shapes.

[0051] In other embodiments, the tooth trace of the ring gear 21 may not pass through the oil collecting cavity inlet 111. The ring gear 21 does not directly throw the lubricating oil into the oil collecting cavity 11 through the oil collecting cavity inlet 111, but indirectly throws it into the oil collecting cavity 11. Specifically, when the ring gear 21 rotates, it first directly throws the lubricating oil towards the inner wall surface of the gear cavity 12. Then, under the action of gravity, the lubricating oil flows along the inner wall surface of the gear cavity 12 towards the oil collecting cavity inlet 111 and thus flows into the oil collecting cavity 11, or the lubricating oil drips from the inner wall surface of the gear cavity 12 under the action of gravity, and the oil droplets of the lubricating oil pass through the oil collecting cavity inlet 111 and thus drip into the oil collecting cavity 11.

[0052] Further, a bent flow channel 13 communicating with the oil collecting cavity 11 is also formed in the housing 10. One end of the bent flow channel 13 far from the oil collecting cavity 11 forms an oil drain port 130. The bent flow channel 13 is used to form a lubricating oil flow path with a longer length and a more tortuous shape, so as to drain the lubricating oil with a small amount, stable and continuous drainage effect, and prevent the lubricating oil in the oil collecting cavity 11 from being emptied too quickly, thus causing the lubrication of the differential 20 to be interrupted. The bent flow channel 13 is not necessary, and the oil drain port 130 can also be directly opened at one end of the oil collecting cavity 11 close to the bottom wall of the oil chamber 121, as long as the oil collecting cavity inlet 111 is higher than the oil drain port 130.

[0053] Refer to Figures 1 - 2 、 Figures 5 - 6 , the partition rib 15 includes a first partition rib 152 and a second partition rib 153 provided in the housing 10. The lubricating oil flow path is approximately U-shaped. The bent flow channel 13 includes an upstream section 131 and a downstream section 132. The upstream section 131 is located on a side of the first partition rib 152 far from the second partition rib 153, and the downstream section 132 is located between the first partition rib 152 and the second partition rib 153. The upstream section 131 and the downstream section 132 are bent and communicated with each other. One end of the upstream section 131 far from the downstream section 132 communicates with one end of the oil collecting cavity 11 close to the oil chamber 121, and one end of the downstream section 132 far from the upstream section 131 forms the oil drain port 130.

[0054] Optionally, in order to obtain the housing 10 at a lower cost and improve the process economy and reliability of the reducer, the housing 10 includes a side cover 14 and a hollow housing 101 formed by separate molding. The inner cavity of the hollow housing 101 is used to form the oil collecting cavity 11 and the gear cavity 12. The hollow housing 101 is provided with a through hole communicating with the inner cavity of the hollow housing 101, and the side cover 14 is located outside the hollow housing 101 and covers the through hole. As Figure 5 and Figure 6As shown, the through port is opened on the side of the hollow housing 101 relatively close to the power source 40, and the side cover 14 is covered on the side of the hollow housing 101 close to the power source 40. The axes of the gear ring 21 and the first reduction gear 321 are perpendicular to the side cover 14 and the side of the hollow housing 101 close to the power source 40. The side of the side cover 14 facing away from the power source 40 is used to form a part of the inner wall of the housing 10. A liquid gap is formed between the first partition rib 152 and the side of the side cover 14 facing away from the power source. The second partition rib 153 extends to the opening edge of the through port.

[0055] Refer to Figure 7 , the lubricating oil entering the oil collecting chamber 11 first flows into the upstream section 131 in the direction of arrow B1, and then, the lubricating oil entering the upstream section 131 flows in the direction of arrow B2 and approaches the side cover 14. Subsequently, the lubricating oil enters the downstream section 132 from the liquid gap between the side cover 14 and the first partition rib 152 in the direction of arrow B3. Then, the lubricating oil moves away from the side cover 14 and towards the oil drain port 130 in the direction of arrow B4. Finally, the lubricating oil reaches the teeth of the second reduction gear 322 from the oil drain port in the direction of arrow B5, and the second reduction gear 322 throws the lubricating oil into the side window hole 222 in the direction of arrow B6. The trajectory of the lubricating oil flowing through the upstream section 131, the liquid gap, and the downstream section 132 is approximately U-shaped. To prevent the lubricating oil from leaking out through the through port, the side cover 14 and the hollow housing 101 can be fixed by welding or sealed and bonded.

[0056] With such an arrangement, a tortuous lubricating oil flow path is arranged within the limited internal space of the housing 10, the travel of the lubricating oil from the oil collecting chamber 11 to the oil drain port 130 is extended, the liquid gap can limit the flow rate and flow volume of the lubricating oil, the flow rate and flow resistance of the lubricating oil meet the required lubricating oil discharge flow volume at the oil drain port 130, and it is convenient to obtain the hollow housing 101 by an integral casting process, and then assemble the side cover 14 and the hollow housing 101 to obtain the housing 10, achieving a complex lubricating oil flow path with a relatively simple and reliable process.

[0057] Figures 1 - 6 In the illustrated embodiment, the input gear 31, the first reduction gear 321, the second reduction gear 322, and the gear ring 21 are all cylindrical gears. In other embodiments, the axis of the first reduction gear 321 and the axis of the gear ring 21 may not be parallel, the first reduction gear 321 and the gear ring 21 may also be bevel gears, and the input gear 31 and the second reduction gear 322 may also be bevel gears.

[0058] Further, refer to Figures 1 - 4, the partition rib 15 further includes an arc rib 154. The input gear 31 is rotatably mounted in the housing 10 through a gear bearing. The arc rib 154 is located on the outer peripheral side of the gear bearing and extends along the circumferential direction of the gear bearing. The arc rib 154 and the oil guiding rib 151 together form the inner wall of the oil collecting cavity 11. With such a setting, when there is more lubricating oil accumulated in the oil collecting cavity 11, this lubricating oil can also cool the arc rib 154 and allow the heat of the gear bearing to be conducted to the arc rib 154, and then conducted to the lubricating oil in the oil collecting cavity 11, so as to realize the cooling of the gear bearing. The distance between the arc rib 154 and the oil guiding rib 151 changes in a gradually decreasing trend along the direction close to the bottom wall of the oil chamber 121. In this way, an approximately funnel-shaped oil collecting cavity 11 is formed between the arc rib 154 and the oil guiding rib 151, so as to guide the lubricating oil to the oil discharge port 130 located at the bottom of the oil collecting cavity 11 or to flow through the bent flow path 13.

[0059] Refer to Figures 2 - 3 , the differential case 22 is located on the back of the ring gear 21, so the differential case 22 is not visible. The power source 40 inputs power to the input gear 31. The second reduction gear 322 is driven by the input gear 31 and rotates clockwise in the direction of arrow A3. The first reduction gear 321 follows the second reduction gear 322 and rotates at the same speed and in the same rotation direction. The ring gear 21 is driven by the first reduction gear 321 and rotates counterclockwise in the direction of arrow A1. At the same time, the ring gear 21 flings the lubricating oil into the oil collecting cavity inlet 111. The lubricating oil entering the oil collecting cavity 11 from the oil collecting cavity inlet 111 flows along the oil guiding rib 151 towards the bottom of the oil collecting cavity 11 in the direction of arrow A2. Then the lubricating oil flows into the upstream section 131 in a direction perpendicular to the Figure 2 plane where it is located, that is, flows into the upstream section 131 in the direction indicated by the × mark in Figure 3 . Then the lubricating oil turns around and flows into the downstream section 132 in a direction perpendicular to the Figure 2 plane where it is located, that is, flows into the upstream section 131 in the direction indicated by the · mark in Figure 3 . Finally, the lubricating oil is discharged from the oil discharge port 130 and is received by the teeth of the second reduction gear 322. The second reduction gear 322 flings the received lubricating oil towards the side window wall 221 so that the lubricating oil droplets splash through the side window holes 222, thereby realizing the lubrication of structures such as the planetary gear 23 and the half shaft gear 24.

[0060] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0061] Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. As long as appropriate changes and variations made to the above embodiments fall within the scope of the spirit of the present utility model, they fall within the scope of protection required by the present utility model.

Claims

1. A speed reducer, characterized in that, including a housing (10) configured with an oil collecting cavity (11) and an oil drain port (130) communicating with each other, a differential (20) including a ring gear (21) and a differential case (22), the ring gear (21) being disposed within the housing (10) and capable of flinging lubricating oil into the oil collecting cavity (11), the differential case (22) being fixedly disposed on the ring gear (21) and having a side window hole (222), a speed reduction gear train (30) including a first reduction gear (321) and an oil flinging portion, the first reduction gear (321) being rotatably disposed within the housing (10) and connected to the ring gear (21), the oil flinging portion being connected to the first reduction gear (321) and configured to fling the lubricating oil discharged from the oil drain port (130) into the side window hole (222) during rotation of the first reduction gear (321).

2. The speed reducer according to claim 1, characterized in that, The housing (10) is further configured with a gear cavity (12) for accommodating the differential (20) and the speed reduction gear train (30), the gear cavity (12) including an oil chamber (121), and the tooth trace of the ring gear (21) passing through the inlet of the oil collecting cavity (11) and the oil chamber (121).

3. The speed reducer according to claim 2, characterized in that, The inlet of the oil collecting cavity (11) is formed at an end of the oil collecting cavity (11) relatively far from the oil chamber (121), and the other end of the oil collecting cavity (11) relatively close to the oil chamber (121) communicates with the oil drain port (130).

4. The speed reducer according to claim 1, wherein The speed reduction gear train (30) further includes a second reduction gear (322) connected to the first reduction gear (321), the second reduction gear (322) being configured to connect to an external power source (40), the oil flinging portion including the teeth of the second reduction gear (322), and the tooth trace of the second reduction gear (322) passing through the oil drain port (130).

5. The speed reducer according to claim 4, characterized in that, The differential case (22) is coaxially connected to the ring gear (21), the first reduction gear (321) meshes with the ring gear (21), the second reduction gear (322) is coaxially and fixedly connected to the first reduction gear (321), and the oil flinging portion is located on the outer peripheral side of the differential case (22) and is spaced apart from the differential case (22).

6. The speed reducer according to claim 5, characterized in that, The speed reduction gear train (30) further includes an input gear (31) rotatably disposed within the housing (10), the second reduction gear (322) meshing with the input gear (31), the input gear (31) being connected to the external power source (40) and capable of transmitting the power of the external power source (40) to the second reduction gear (322).

7. The speed reducer according to claim 1, characterized in that, The oil flinging portion includes an oil flinging rod and oil flinging blades, the oil flinging rod being fixedly connected to the first reduction gear (321), the oil flinging blades being disposed on the oil flinging rod, the first reduction gear (321) being configured to connect to an external power source (40), and the oil flinging rod and the oil flinging blades being capable of being driven by the first reduction gear (321) to rotate.

8. The speed reducer according to claim 7, characterized in that, The rotation trace of the oil flinging blades passes through the oil drain port (130); and / or, The differential case (22) is coaxially connected to the ring gear (21). The first reduction gear (321) meshes with the ring gear (21). The oil slinging vane is located on the outer peripheral side of the differential case (22) and is spaced apart from the differential case (22); and / or, The reduction gear train (30) further includes an input gear rotatably disposed in the housing (10). The input gear meshes with the first reduction gear (321) and is connected to the external power source (40).

9. The speed reducer according to any one of claims 1 to 8, characterized in that, The housing (10) is further configured with a gear chamber (12) for accommodating the differential (20) and the reduction gear train (30), and further includes a partition rib (15) separating the oil collecting chamber (11) from the gear chamber (12). The partition rib (15) includes an oil guiding rib (151), wherein The oil guiding rib (151) is disposed on the outer peripheral side of the ring gear (21) and extends circumferentially along the ring gear (21); and / or, One end of the oil guiding rib (151) extends towards the oil drain port (130), and the other end is spaced apart from the top wall of the gear chamber (12) to form an inlet of the oil collecting chamber (11).

10. The speed reducer according to any one of claims 1 to 8, characterized in that, The housing (10) is further configured with a bent flow channel (13). One end of the bent flow channel (13) communicates with the oil collecting chamber (11), and the other end of the bent flow channel (13) forms the oil drain port (130).

11. The speed reducer according to claim 10, characterized in that, A first partition rib (152) and a second partition rib (153) are provided in the housing (10). The bent flow channel (13) includes an upstream section (131) located on a side of the first partition rib (152) away from the second partition rib (153), and further includes a downstream section (132) located between the first partition rib (152) and the second partition rib (153). A liquid gap between the first partition rib (152) and the inner wall of the housing (10) communicates the upstream section (131) with the downstream section (132). The upstream section (131) communicates with the oil collecting chamber (11), and the oil drain port (130) is formed in the downstream section (132).

12. The speed reducer according to claim 11, wherein, The housing (10) includes a side cover (14) and a hollow housing (101) formed separately. The hollow housing (101) has a through hole communicating with the inner cavity of the hollow housing (101). The side cover (14) is disposed outside the hollow housing (101) and covers the through hole. The side cover (14) is used to form a part of the inner wall of the housing (10). The liquid gap is formed between the first partition rib (152) and the side cover (14). The second partition rib (153) extends to the opening edge of the through hole.

13. A vehicle, characterized in that, A speed reducer as claimed in any one of claims 1 to 12 is included.

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