Differential lubrication system

Abstract

The utility model discloses a differential lubricating system, which relates to the technical field of differential manufacturing, and comprises a shell, a first gear, a second gear, a motor shaft and a long shaft, the first gear and the second gear are arranged in a containing cavity of the shell and coaxially rotate with the shell, and the long shaft is arranged in the containing cavity of the shell. The motor shaft is connected with the first gear through a first hole formed in the shell, and an axial cavity is formed in the motor shaft. The long shaft penetrates through the axial cavity and extends into the containing cavity to be connected with the second gear. An oil feeding passage is formed between the long shaft and the motor shaft, an axial oil duct communicated with the accommodating cavity is formed in the long shaft, and a radial oil duct used for communicating the axial oil duct with the oil feeding passage is formed in the long shaft; the first gear, the second gear, the motor shaft and the long shaft are coaxially arranged. According to the technical scheme provided by the utility model, the differential mechanism does not need to be lubricated in an oil stirring manner, so that the loss of oil stirring power of the gear structure of the differential mechanism is reduced, and the loss of the oil stirring power of the differential mechanism can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of differential manufacturing, in particular to a differential lubrication system. Background Art

[0002] With the rapid development of the new energy vehicle industry, higher technical requirements have been put forward for the differential structure. Compared with traditional fuel vehicles, new energy vehicles require a more precise and efficient differential structure. In the current differential lubrication and cooling scheme, the internal structure of the differential is usually lubricated and cooled by oil stirring splash lubrication. However, during splash lubrication, the gear system will produce a large oil stirring power loss, which accounts for about 30% of the total power loss, resulting in certain technical bottlenecks in improving the transmission efficiency of the differential. However, the rapid development of new energy vehicles has continuously put forward higher requirements for the transmission efficiency of the differential.

[0003] In view of this, it is necessary to propose a differential lubrication system to solve or at least alleviate the above technical problems. Utility Model Content

[0004] The main purpose of the utility model is to provide a differential lubrication system, aiming at reducing the oil stirring power loss of the differential.

[0005] To achieve the above-mentioned purpose, the differential lubrication system proposed by the utility model comprises:

[0006] A housing, wherein a receiving cavity is formed inside the housing, and the housing is provided with a first opening communicating with the receiving cavity;

[0007] A gear set structure, the gear set structure is arranged in the accommodating cavity, the gear set structure comprises a first gear, a second gear, a planetary gear and a planetary shaft, the first gear rotates coaxially with the housing, the second gear meshes with the planetary gear, the planetary gear is rotatably mounted on the planetary shaft, and the planetary shaft rotates synchronously with the housing;

[0008] A motor shaft, one end of which passes through the first opening and is connected to the first gear, and an axial cavity is formed inside the motor shaft;

[0009] A long shaft, the long shaft passes through the axial cavity and extends into the accommodating cavity to be connected with the second gear;

[0010] An oil delivery passage is formed between the long shaft and the motor shaft, the long shaft is formed with an axial oil passage communicating with the accommodating chamber, and the long shaft is provided with a radial oil passage for communicating the axial oil passage with the oil delivery passage;

[0011] The first gear, the second gear, the motor shaft and the long shaft are all coaxially arranged.

[0012] In one embodiment, the motor shaft includes an oil inlet section and a support section, the inner diameter of the oil inlet section is larger than the inner diameter of the support section, the oil delivery passage is formed between the oil inlet section and the long axis, and the inner wall of the support section is slidably connected to the outer wall of the long axis.

[0013] In one embodiment, the long shaft includes a small diameter section and a large diameter section, the diameter of the small diameter section is smaller than the diameter of the large diameter section, the oil delivery passage is formed between the small diameter section and the motor shaft, and the outer wall of the large diameter section is slidably connected to the inner wall of the motor shaft.

[0014] In one embodiment, the number of the radial oil passages is at least two, and the at least two radial oil passages are evenly spaced apart along the circumference of the major axis.

[0015] In one embodiment, the differential lubrication system further comprises a differential flange and an oil collecting pan, the housing comprises a second opening arranged opposite to the first opening, the differential flange is mounted on the housing on a side provided with the second opening, and rotates coaxially with the housing, the differential flange comprises a panel and an annular protrusion, the annular protrusion is arranged on a side of the panel away from the accommodating cavity, the oil collecting pan is mounted on the panel, and the panel is provided with an oil inlet hole communicating with the accommodating cavity;

[0016] The oil collecting pan comprises an inner plate and a peripheral body, wherein the inner plate is arranged close to the panel, and a first through hole is formed on the inner plate, wherein the size of the first through hole is larger than the outer diameter of the annular protrusion, and the first through hole can allow the annular protrusion to pass through;

[0017] An oil collecting hole is provided at a position of the inner plate close to the peripheral body, and the oil collecting hole is communicated with the oil inlet hole.

[0018] In one embodiment, the oil collecting pan further comprises an oil delivery pipe, the oil delivery pipe is arranged on a side of the inner plate facing the panel, and the oil collecting hole is connected to the oil inlet hole through the oil delivery pipe.

[0019] In one embodiment, a plurality of the oil inlet holes are spaced apart on the differential flange, and the oil collecting pan is correspondingly provided with a plurality of the oil collecting holes and a plurality of the oil delivery pipes.

[0020] In one embodiment, the oil collecting pan includes an oil collecting area, which is surrounded by the inner plate and the peripheral body, and the oil collecting hole is arranged at an edge position of the inner plate close to the peripheral body, and the oil collecting area is connected to the oil collecting hole.

[0021] In one embodiment, the oil collecting pan is further provided with an oil retaining edge, which is arranged on the side of the oil collecting pan away from the panel, and a second through hole is formed in the middle of the oil retaining edge, the size of the second through hole is larger than the outer diameter of the annular protrusion, and the second through hole can allow the annular protrusion to pass through.

[0022] In one embodiment, a window is further provided on the housing, and the window is used to allow lubricating oil to flow out from the interior of the housing.

[0023] In the technical solution provided by the utility model, the differential lubrication system includes a housing, a gear set structure, a motor shaft and a long shaft, wherein a accommodating chamber is formed inside the housing, and the housing is provided with a first opening connected to the accommodating chamber; the gear set structure is arranged in the accommodating chamber, and the gear set structure includes a first gear, a second gear, a planetary gear and a planetary shaft, the first gear rotates coaxially with the housing, the second gear meshes with the planetary gear, the planetary gear is rotatably mounted on the planetary shaft, and the planetary shaft rotates synchronously with the housing; one end of the motor shaft passes through the first opening and is connected to the first gear, and an axial cavity is formed inside the motor shaft; the long shaft passes through the axial cavity and extends into the accommodating chamber and is connected to the second gear; an oil supply passage is formed between the long shaft and the motor shaft, the long shaft is provided with an axial oil passage connected to the accommodating chamber, and the long shaft is provided with a radial oil passage for connecting the axial oil passage with the oil supply passage; the first gear, the second gear, the motor shaft and the long shaft are all coaxially arranged. Through this arrangement, the lubricating liquid can directly enter the core area of ​​the gear set structure of the differential, that is, the area between the second gear and the planetary gear, through the oil delivery passage, the radial oil passage and the axial oil passage. In this way, the differential does not need to immerse part of the gears in the lubricating oil to lubricate the differential gear structure by stirring the oil and splashing it, thereby reducing the loss of the oil stirring power of the differential gear structure, and further reducing the oil stirring power loss of the differential, which is beneficial to improving the overall transmission efficiency of the differential. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 A cross-sectional structural diagram of an embodiment of a differential lubrication system provided by the utility model;

[0026] Figure 2 A schematic structural diagram of an embodiment of a differential lubrication system provided by the utility model;

[0027] Figure 3 for Figure 1 Schematic diagram of some structures in ;

[0028] Figure 4 for Figure 2 A schematic diagram of the structure from another perspective;

[0029] Figure 5 This is a schematic structural diagram of an oil collecting pan in an embodiment of a differential lubrication system provided by the utility model.

[0030] Description of Figure Numbers:

[0031] 100. Differential lubrication system; 1. Housing; 11. Window; 12. First opening; 13. Second opening; 2. Gear set structure; 21. First gear; 22. Second gear; 23. Planetary gear; 24. Planetary shaft; 25. Epicyclic gear; 26. Fixed gear ring; 3. Motor shaft; 31. Oil inlet section; 32. Support section; 4. Long shaft; 41. Axial oil passage; 42. Radial oil passage; 5. Oil delivery passage; 6. Differential flange; 61. Panel; 62. Annular protrusion; 7. Oil collecting tray; 71. Inner plate; 711. Oil collecting hole; 72. Peripheral body; 73. Oil delivery pipe; 74. Oil collecting area; 75. Oil retaining edge; 8. Bearing.

[0032] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0036] With the rapid development of technology, the implementation forms of differentials are diverse. With the gradual expansion of the new energy vehicle market, higher requirements are constantly being placed on the performance of new energy vehicles. Among them, the differential is an important part of the technological upgrade of new energy vehicles. Compared with traditional gasoline and diesel-driven vehicles, the drive system of new energy vehicles is more compact. New energy vehicles integrate the drive shaft, differential, half shaft, etc. into the differential system. The drive shaft distributes the speed of the wheels on both sides of the vehicle through the differential, so as to adjust the speed difference of the wheels on both sides to adapt to the different turning radius of the inner and outer wheels when turning, thereby ensuring the stability and controllability of the vehicle.

[0037] According to the applicant's research, the transmission in the current vehicle usually adopts oil-stirring splash lubrication. This lubrication method relies on the oil-stirring gear inside the differential to splash the oil when rotating, forming oil droplets or oil mist to lubricate the gears and other parts inside the differential. This method is characterized by a simple structure, but it will cause oil-stirring power loss during the splash lubrication process. The oil-stirring power loss can reach 30% of the total power loss, which is not conducive to the improvement of the transmission efficiency of new energy vehicles. However, the high oil-stirring power loss is difficult to adapt to the higher requirements constantly put forward by the development of new energy vehicles.

[0038] In view of this, the utility model proposes a differential lubrication system to solve the above technical problems.

[0039] See also Figure 1 and Figure 2In one embodiment of the utility model, the differential lubrication system 100 includes a housing 1, a gear set structure 2, a motor shaft 3 and a long shaft 4, wherein a receiving chamber is formed inside the housing 1, and the housing 1 is provided with a first opening 12 communicating with the receiving chamber; the gear set structure 2 is arranged in the receiving chamber, and the gear set structure 2 includes a first gear 21, a second gear 22, a planetary gear 23 and a planetary shaft 24, the first gear 21 rotates coaxially with the housing 1, the second gear 22 meshes with the planetary gear 23, the planetary gear 23 is rotatably mounted on the planetary shaft 24, and the planetary shaft 24 rotates coaxially with the housing 1 One end of the motor shaft 3 passes through the first opening 12 and is connected to the first gear 21, an axial cavity is formed inside the motor shaft 3, the long shaft 4 passes through the axial cavity and extends into the accommodating cavity to be connected to the second gear 22, and an oil delivery passage 5 is formed between the long shaft 4 and the motor shaft 3, the long shaft 4 is formed with an axial oil passage 41 connected to the accommodating cavity, and at the same time, the long shaft 4 is provided with a radial oil passage 42 for connecting the axial oil passage 41 with the oil delivery passage 5; in addition, in order to avoid transmission loss caused by eccentricity, the first gear 21, the second gear 22, the motor shaft 3 and the long shaft 4 are all coaxially arranged.

[0040] Specifically, the first gear 21 in the differential lubrication system 100 generally refers to the sun gear in the differential, which is arranged in the accommodating cavity and rotates coaxially with the housing 1. The second gear 22 generally refers to the half-shaft gear in the differential, which is connected to the half-shaft. The half-shaft is divided into a left half-shaft and a right half-shaft, which are respectively used to connect the wheels on both sides of the vehicle. In this embodiment, the long axis 4 refers to one of the left half-shaft or the right half-shaft. The gear set structure 2 in this embodiment includes a speed change mechanism and a differential mechanism, and the speed change mechanism includes a first gear 21, an epicyclic wheel 25 and a fixed gear ring 26, wherein the motor shaft 3 is connected to the first gear 21, and the first gear 21 is meshed with the epicyclic wheel 25 around the first gear 21, and the epicyclic wheel 25 includes a first meshing portion meshed with the first gear 21 and a second meshing portion meshed with the fixed gear ring 26, and the epicyclic wheel 25 is rotatably mounted on the inner wall of the housing 1, and the fixed gear ring 26 is fixedly mounted on other structures on the outer side of the housing 1 and meshed with the second meshing portion. In this embodiment, the number of the epicyclic wheels 25 is three, and the three epicyclic wheels 25 are arranged around the first gear 21. The differential mechanism in this embodiment includes a planetary shaft 24, a planetary wheel 23 and a second gear 22, wherein the planetary shaft 24 is fixedly connected to the inner wall of the housing 1, the planetary shaft 24 is coaxial with the housing 1 and rotates synchronously, the planetary shaft 24 has at least two planetary arms extending from its rotation axis toward the housing 1, and a planetary wheel 23 is rotatably mounted at the end of each planetary arm, the planetary wheel 23 is provided with helical teeth, the second gear 22 is meshed with the planetary wheel 23, and the long shaft 4 is connected to the second gear 22. The axis when the first gear 21 rotates is defined as the input axis, and the axis when the second gear 22 rotates is defined as the output axis. In this embodiment, the input axis coincides with the output axis. When the motor shaft 3 inputs torque to the first gear 21, the first gear 21 rotates, and the first gear 21 drives the first meshing portion of the epicyclic wheel 25 to rotate, and the first meshing portion drives the second meshing portion to rotate, and the second meshing portion meshes with the fixed gear ring 26. Under the action of the fixed gear ring 26, the second meshing portion moves along the inner gear ring of the fixed gear ring 26, thereby driving the housing 1 to rotate. When the housing 1 rotates, it drives the planetary shaft 24 to rotate synchronously, thereby driving the planetary gear 23 to revolve around the input axis, and driving the second gear 22 meshing with the planetary gear 23 to rotate. Finally, under the action of the second gear 22, the long shaft 4 starts to rotate, driving the wheels connected thereto to rotate. When the vehicle turns, the rotation speeds of the wheels on both sides are different. At this time, the planetary gear 23 rotates around the planetary arm, thereby automatically adjusting the rotation speeds of the second gears 22 on both sides to achieve a differential function.

[0041] In this embodiment, an axial cavity is provided in the motor shaft 3, so that the long shaft 4 can pass through the axial cavity and enter the accommodating cavity to connect with the second gear 22, and the motor shaft 3 passes through the first opening 12 to connect with the first gear 21, while the motor shaft 3 is not provided on the side away from the motor shaft 3, and the long shaft 4 on this side directly extends into the accommodating cavity to connect with the second gear 22 on this side. An oil delivery passage 5 is formed between the motor shaft 3 and the long shaft 4, and the oil pumping system arranged outside the differential can pump lubricating oil into the oil delivery passage 5; inside the long shaft 4, an axial oil passage 41 communicating with the accommodating cavity and a radial oil passage 42 for connecting the axial oil passage 41 with the oil delivery passage 5 are provided, and the lubricating oil pumped into the oil delivery passage 5 enters the accommodating cavity through the radial oil passage 42 and the axial oil passage 41, and falls into the differential mechanism. Due to the centrifugal force of the rotation of the differential mechanism and the rotation of the gears, the lubricating oil can splash onto the gear set structure 2 at various locations inside the housing 1, thereby playing a role in lubricating and cooling the gear set structure 2.

[0042] In the embodiment provided by the utility model, the differential lubrication system 100 includes a housing 1, a gear set structure 2, a motor shaft 3 and a long shaft 4, wherein a housing 1 is formed with a housing cavity, and the housing 1 is provided with a first opening 12 communicating with the housing cavity; the gear set structure 2 is arranged in the housing cavity, and the gear set structure 2 includes a first gear 21, a second gear 22, a planetary gear 23 and a planetary shaft 24, the first gear 21 rotates coaxially with the housing 1, the second gear 22 meshes with the planetary gear 23, the planetary gear 23 is rotatably mounted on the planetary shaft 24, and the first gear 21 rotates coaxially with the housing 1, the second gear 22 meshes with the planetary gear 23, and ... The star shaft 24 rotates synchronously with the housing 1; one end of the motor shaft 3 passes through the first opening 12 and is connected to the first gear 21, and an axial cavity is formed inside the motor shaft 3; the long shaft 4 passes through the axial cavity and extends into the accommodating cavity and is connected to the second gear 22; an oil supply passage 5 is formed between the long shaft 4 and the motor shaft 3, and the long shaft 4 is formed with an axial oil passage 41 connected to the accommodating cavity, and the long shaft 4 is provided with a radial oil passage 42 for connecting the axial oil passage 41 with the oil supply passage 5; at the same time, the first gear 21, the second gear 22, the motor shaft 3 and the long shaft 4 are all coaxially arranged. Through this arrangement, the lubricating oil can directly enter the core area of ​​the gear set structure 2 of the differential, that is, the area between the second gear 22 and the planetary gear 23, through the oil delivery passage 5, the radial oil passage 42 and the axial oil passage 41. In this way, the differential does not need to immerse part of the gears in the lubricating oil to lubricate the differential gear structure by stirring the oil and splashing it, thereby reducing the loss of the oil stirring power of the differential gear structure, and further reducing the oil stirring power loss of the differential, which is beneficial to improving the overall transmission efficiency of the differential.

[0043] Further, in one embodiment of the utility model, the motor shaft 3 includes an oil inlet section 31 and a support section 32, the inner diameter of the oil inlet section 31 is larger than the inner diameter of the support section 32, an oil delivery passage 5 is formed between the oil inlet section 31 and the long shaft 4, and the inner wall of the support section 32 is slidably connected to the outer wall of the long shaft 4. Figure 1 , the inner diameter and outer diameter of the oil inlet section 31 of the motor shaft 3 are both larger than the inner diameter and outer diameter of the support section 32, and the inner diameter of the oil inlet section 31 is larger than the outer diameter of the long shaft 4, so that an oil delivery passage 5 is formed between the long shaft 4 and the oil inlet section 31; and in the support section 32, the outer wall of the long shaft 4 is slidably fitted with the inner wall of the support section 32. Through this arrangement, in the support section 32 of the motor shaft 3, since the gap between the support section 32 and the long shaft 4 is small, it is difficult for the lubricating oil to pass through, so that the lubricating oil can only enter the differential mechanism, that is, the core area of ​​the differential, through the radial oil passage 42 and the axial oil passage 41 under the action of the pumping pressure, thereby improving the lubrication effect and avoiding excessive outflow of the lubricating oil at the first gear 21, which affects the lubrication effect of the differential structure; in addition, this arrangement is equivalent to arranging a sliding bearing 8 on the periphery of the long shaft 4, which can provide support force to the long shaft 4.

[0044] Obviously, there is more than one implementation form of the oil delivery passage 5. In another embodiment of the utility model, the long shaft 4 includes a small diameter section and a large diameter section, the diameter of the small diameter section is smaller than the diameter of the large diameter section, the oil delivery passage 5 is formed between the small diameter section and the motor shaft 3, and the outer wall of the large diameter section is slidably connected to the inner wall of the motor shaft 3. In this embodiment, the outer diameter and inner diameter of the motor shaft 3 remain unchanged, the outer diameter of the small diameter section of the long shaft 4 is smaller than the large diameter section, and the large diameter section is arranged close to the first gear 21. The length of the axial oil passage 41 is determined according to the inclination angle of the radial oil passage 42. When the radial oil passage 42 is arranged perpendicular to the motor shaft 3, the length of the axial oil passage 41 is greater than the length of the large diameter section, so that it can be connected with the oil delivery passage 5 under the action of the radial oil passage 42.

[0045] Furthermore, in one embodiment of the present invention, the number of radial oil passages 42 is at least two, and at least two radial oil passages 42 are evenly spaced along the circumference of the major axis 4. Figure 2 In order to ensure that the lubricating oil can smoothly enter the axial oil passage 41 and improve the oil intake efficiency, at least two radial oil passages 42 are arranged along the circumference of the long axis 4. In this embodiment, the number of radial oil passages 42 is four, and the four radial oil passages 42 are evenly arranged in the circumference of the long axis 4. The central axes of the two opposite radial oil passages 42 are overlapped and perpendicular to the axis of the motor shaft 3. On the whole, the four radial oil passages 42 are arranged in a cross shape.

[0046] In addition, in one embodiment of the present utility model, the differential lubrication system 100 also includes a differential flange 6 and an oil collecting pan 7. The housing 1 includes a second opening 13 arranged opposite to the first opening 12. The differential flange 6 is installed on the housing 1 on the side where the second opening 13 is provided, and rotates coaxially with the housing 1. The differential flange 6 includes a panel 61 and an annular protrusion 62. The annular protrusion 62 is arranged on the side of the panel 61 away from the accommodating cavity. The oil collecting pan 7 is installed on the panel 61. The panel 61 is provided with an oil inlet hole connected to the accommodating cavity. The oil collecting pan 7 includes an inner plate 71 and a peripheral body 72. The inner plate 71 is arranged close to the panel 61. The inner plate 71 is formed with a first through hole. The size of the first through hole is larger than the outer diameter of the annular protrusion 62. The first through hole can allow the annular protrusion 62 to pass through. An oil collecting hole 711 is provided at a position of the inner plate 71 close to the peripheral body 72. The oil collecting hole 711 is connected to the oil inlet hole. For details, please refer to Figures 3 to 5 The differential flange 6 is covered on the second opening 13. A cavity is formed in the annular protrusion 62 for communicating with the second opening 13. The diameter of the second opening 13 and the cavity is larger than the diameter of the half shaft, so that the half shaft can pass through the cavity and the second opening 13 to enter the accommodating cavity and connect with the second gear 22. An oil inlet hole is opened on the panel 61 of the differential flange 6, and the oil inlet hole is communicated with the accommodating cavity. Please refer to Figure 3 After the lubricating oil enters the oil inlet hole, it can directly flow into the differential mechanism, that is, directly flow to the installation position of the planetary gear 23 and the second gear 22, so as to avoid affecting the lubrication effect of the differential mechanism. At the same time, the inner plate 71 of the oil collecting pan 7 is arranged in parallel with the panel 61 of the differential flange 6, and the two can be arranged in close contact. An oil collecting hole 711 is opened on the inner plate 71 corresponding to the oil inlet hole, and the oil collecting hole 711 can be directly connected to the oil inlet hole. The lubricating oil pumped to the oil collecting pan 7 by the external pumping system enters the oil collecting hole 711 through the action of centrifugal force and flows into the oil inlet hole. The size of the first through hole formed on the inner plate 71 is larger than the outer diameter of the annular protrusion 62. At the same time, a bearing 8 is installed at the end of the annular protrusion 62 away from the shell 1. The bearing 8 is used to support the rotation of the shell 1. Through this arrangement, the lubricating oil can be transported to the gap between the oil collecting pan 7, the annular protrusion 62 and the bearing 8 through the pumping system, and then the lubricating oil flows to the oil collecting hole 711 through the action of the rotating centrifugal force, and then enters the accommodating cavity through the oil inlet hole.

[0047] Furthermore, in an embodiment of the utility model, the oil collecting pan 7 further includes an oil delivery pipe 73, which is arranged on the side of the inner plate 71 facing the panel 61, and the oil collecting hole 711 is connected with the oil inlet hole through the oil delivery pipe 73. Through this arrangement, on the one hand, it is possible to prevent the lubricating oil from flowing out of the gap between the oil inlet hole and the oil collecting hole 711, resulting in waste of lubricating oil; on the other hand, one end of the oil delivery pipe 73 is fixedly arranged on the inner plate 71 of the oil collecting pan 7, and the other end is installed in the oil inlet hole. This arrangement can play a role in positioning and limiting the oil collecting pan 7, which can improve the installation efficiency during installation and prevent the oil collecting pan 7 from eccentric rotation during use.

[0048] In addition, to improve the efficiency of lubricant delivery, please refer to Figure 5 A plurality of oil inlet holes are spaced apart on the differential flange 6, and a plurality of oil collecting holes 711 and a plurality of oil delivery pipes 73 are correspondingly provided on the oil collecting pan 7. More specifically, the plurality of oil collecting holes 711 and the corresponding oil delivery pipes 73 and the oil inlet holes are evenly spaced apart, so that the lubricating oil can evenly enter the accommodating cavity, further improving the lubrication effect.

[0049] In one embodiment of the present invention, the oil collecting pan 7 includes an oil collecting area 74, which is surrounded by the inner plate 71 and the peripheral body 72. The oil collecting hole 711 is disposed at an edge of the inner plate 71 close to the peripheral body 72, and the oil collecting area 74 is connected to the oil collecting hole 711. Figure 5 The three oil collecting holes 711 share one oil collecting area 74. Under the action of centrifugal force, the lubricating oil gradually converges to the oil collecting area 74. The oil collecting area 74 is used to prevent the lubricating oil from flowing out of the oil collecting plate 7. The lubricating oil gathered in the oil collecting area 74 flows into the oil delivery hole through the oil collecting hole 711 connected to the oil collecting area 74, and finally enters the accommodating cavity.

[0050] In one embodiment of the utility model, the oil collecting pan 7 is further provided with an oil retaining edge 75, which is arranged on the side of the oil collecting pan 7 away from the panel 61, and a second through hole is formed in the middle of the oil retaining edge 75, the size of the second through hole is larger than the outer diameter of the annular protrusion 62, and the second through hole can allow the annular protrusion 62 to pass through. In this embodiment, the oil retaining edge 75 is arranged parallel to the inner plate 71, and has the same shape as the oil retaining edge 75, and a second through hole is formed in the middle of the oil retaining edge 75, and the second through hole is used for the annular protrusion 62 to pass through. Under normal circumstances, the lubricating oil can flow directly into the oil collecting hole 711 after being gathered in the oil collecting area 74, and at this time, no excessive lubricating oil will be gathered in the oil collecting area 74, so the lubricating oil will not splash out of the oil collecting pan 7 under the action of centrifugal force, but under special circumstances, the pumping oil volume of the lubricating oil increases, so that the excessive lubricating oil is gathered in the oil collecting area 74, and at this time, the oil retaining edge 75 needs to be provided to prevent the splashing of the lubricating oil to avoid the waste of the lubricating oil.

[0051] See also Figure 2 and Figure 4 In one embodiment of the utility model, the housing 1 is further provided with a window 11, and the window 11 is used to allow the lubricating oil to flow out from the inside of the housing 1. There are usually multiple windows 11 opened on the housing 1. This arrangement enables the lubricating oil in the accommodating chamber to be discharged in time under the action of centrifugal force, thereby avoiding the situation where excessive lubricating oil accumulates inside the housing 1, thereby avoiding affecting the working efficiency of the differential. At the same time, this arrangement is conducive to the heat discharge inside the accommodating chamber.

[0052] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A differential lubrication system, characterized in that: include: A housing, wherein a receiving cavity is formed inside the housing, and the housing is provided with a first opening communicating with the receiving cavity; A gear set structure, the gear set structure is arranged in the accommodating cavity, the gear set structure comprises a first gear, a second gear, a planetary gear and a planetary shaft, the first gear rotates coaxially with the housing, the second gear meshes with the planetary gear, the planetary gear is rotatably mounted on the planetary shaft, and the planetary shaft rotates synchronously with the housing; a motor shaft, one end of which passes through the first opening and is connected to the first gear, and an axial cavity is formed inside the motor shaft; A long shaft, the long shaft passes through the axial cavity and extends into the accommodating cavity to be connected with the second gear; An oil delivery passage is formed between the long shaft and the motor shaft, the long shaft is formed with an axial oil passage communicating with the accommodating chamber, and the long shaft is provided with a radial oil passage for communicating the axial oil passage with the oil delivery passage; The first gear, the second gear, the motor shaft and the long shaft are all coaxially arranged.

2. The differential lubrication system according to claim 1, characterized in that: The motor shaft includes an oil inlet section and a support section. The inner diameter of the oil inlet section is larger than the inner diameter of the support section. The oil delivery passage is formed between the oil inlet section and the long axis. The inner wall of the support section is slidably connected to the outer wall of the long axis.

3. The differential lubrication system according to claim 1, characterized in that: The long shaft includes a small diameter section and a large diameter section, the diameter of the small diameter section is smaller than the diameter of the large diameter section, the oil delivery passage is formed between the small diameter section and the motor shaft, and the outer wall of the large diameter section is slidably connected to the inner wall of the motor shaft.

4. The differential lubrication system according to claim 1, characterized in that: The number of the radial oil passages is at least two, and at least two of the radial oil passages are evenly spaced along the circumference of the major axis.

5. The differential lubrication system according to claim 1, characterized in that: The differential lubrication system further comprises a differential flange and an oil collecting pan, the housing comprises a second opening arranged opposite to the first opening, the differential flange is mounted on the housing on a side provided with the second opening, and rotates coaxially with the housing, the differential flange comprises a panel and an annular protrusion, the annular protrusion is arranged on a side of the panel away from the accommodating cavity, the oil collecting pan is mounted on the panel, and the panel is provided with an oil inlet hole communicating with the accommodating cavity; The oil collecting pan comprises an inner plate and a peripheral body, wherein the inner plate is arranged close to the panel, and a first through hole is formed on the inner plate, wherein the size of the first through hole is larger than the outer diameter of the annular protrusion, and the first through hole can allow the annular protrusion to pass through; An oil collecting hole is provided at a position of the inner plate close to the peripheral body, and the oil collecting hole is communicated with the oil inlet hole.

6. The differential lubrication system according to claim 5, characterized in that: The oil collecting pan further comprises an oil delivery pipe, which is arranged on a side of the inner plate facing the panel, and the oil collecting hole is communicated with the oil inlet hole through the oil delivery pipe.

7. The differential lubrication system according to claim 6, characterized in that: The differential flange is provided with a plurality of oil inlet holes spaced apart from each other, and the oil collecting pan is correspondingly provided with a plurality of oil collecting holes and a plurality of oil delivery pipes.

8. The differential lubrication system according to claim 5, characterized in that: The oil collecting pan comprises an oil collecting area, which is surrounded by the inner plate and the peripheral body. The oil collecting hole is arranged at an edge of the inner plate close to the peripheral body, and the oil collecting area is connected to the oil collecting hole.

9. The differential lubrication system according to claim 5, characterized in that: The oil collecting pan is also provided with an oil retaining edge, which is arranged on a side of the oil collecting pan away from the panel, and a second through hole is formed in the middle of the oil retaining edge. The size of the second through hole is larger than the outer diameter of the annular protrusion, and the second through hole can allow the annular protrusion to pass through.

10. The differential lubrication system according to any one of claims 1 to 9, characterized in that: The shell is also provided with a window, and the window is used for allowing lubricating oil to flow out from the inside of the shell.

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