Differential oil supply structure and lubrication system

Abstract

The application relates to the technical field of vehicles and discloses a differential oil supply structure and a lubricating system, which provide lubricating oil for a differential main body. The differential oil supply structure comprises a shell, which is used for mounting the differential main body; the differential main body comprises a differential support, two half shaft gears coaxially arranged, two planetary gears and a planetary gear shaft, the differential support surrounds a support cabin, the two half shaft gears are mounted in the support cabin, and the two planetary gears are mounted in the support cabin through the planetary gear shaft; the differential oil supply structure comprises an oil injection hole and an oil supply oil path arranged in the shell, the oil injection hole is communicated with the oil supply oil path, the axis of the oil injection hole is perpendicular to the axis of the half shaft gear, the projection of the oil injection hole is located in the projection range of the planetary gear shaft along the axis direction of the oil injection hole, and an opening is formed in the differential support; the oil injection hole sprays lubricating oil to the planetary gear shaft through the opening, the oil injection hole is aligned with the planetary gear shaft, and each component of the differential can be better lubricated.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a differential oil supply structure and lubrication system. Background Technology

[0002] Dual-motor hybrid vehicles typically include a gasoline engine and two electric motors, using both gasoline and electricity to drive the vehicle.

[0003] In hybrid vehicles, it is usually necessary to lubricate the engine, the two electric motors, the engine transmission system, the two electric motor transmission systems, and the differential. Since the heat dissipation and lubrication oil required by each component are different, multiple delivery pumps are usually needed to deliver the lubricating oil, which makes the vehicle's lubrication system more complex, increases the control cost of the lubrication system, and occupies a large amount of vehicle space, affecting the size of the vehicle's passenger compartment.

[0004] Furthermore, currently available lubrication systems typically only align the oil injection nozzles with the differential, causing the lubricating oil to be concentrated at a single point on the differential, which affects the lubrication effect and the service life of the differential. Utility Model Content

[0005] This application provides a differential oil supply structure and lubrication system to improve the lubrication effect of the differential, while simplifying the lubrication system and reducing the control cost of the lubrication system.

[0006] To achieve the above objectives, the main technical solutions adopted in this application include: In a first aspect, this application provides a differential oil supply structure for supplying lubricating oil to the differential body. The differential oil supply structure includes a housing, which encloses a housing cavity for mounting the differential body within the housing. The differential body includes a differential bracket, two half-shaft gears, two planetary gears, and a planetary gear shaft. The differential bracket encloses a bracket compartment, and the two half-shaft gears are mounted within the bracket compartment. The two half-shaft gears are coaxial, and the two planetary gears are mounted within the bracket compartment via the planetary gear shaft. The differential oil supply structure includes an oil injection hole and an oil supply passage located within the housing. The oil injection hole is connected to the oil supply passage, and the axis of the oil injection hole is perpendicular to the axis of the half-shaft gears. Along the axial direction of the oil injection hole, the projection of the oil injection hole is located within the projection range of the planetary gear shaft. An opening is formed on the differential bracket, and the oil injection hole sprays lubricating oil to the planetary gear shaft through the opening.

[0007] Furthermore, the axis of the oil injection hole is perpendicular to the axis of the half-shaft gear, and the axis of the oil injection hole and the axis of the half-shaft gear are located in the same plane, so that the lubricating oil injected from the oil injection hole can be more evenly splashed to various components of the differential.

[0008] Furthermore, the inner diameter of the oil injection hole is R1, and the inner diameter of the oil supply passage is R2, satisfying the condition: 0.1≤R1 / R2≤0.3, to ensure the lubricating oil injection pressure and improve the lubrication effect of the differential.

[0009] Furthermore, the differential oil supply structure also includes an injection zone located on the planetary gear shaft. Along the axial direction of the oil injection hole, the projection of the planetary gear shaft is located within the projection range of the injection zone; along the circumference of the planetary gear shaft, multiple grooves are formed in the injection zone.

[0010] Furthermore, multiple oil guide grooves are formed on the circumferential sidewall of the planetary gear shaft. The oil guide grooves extend along the axial direction of the planetary gear shaft, and one end of the oil guide groove extends to the position where the planetary gear is installed on the planetary gear shaft, which facilitates the lubricating oil to lubricate the planetary gear and further improves the lubrication effect of the differential.

[0011] Furthermore, the differential oil supply structure also includes an extension post located in the housing. The extension post is located inside the housing cavity, and the oil supply passage and oil injection port are both located on the extension post, which facilitates the alignment of the oil injection port with the center of the planetary gear shaft.

[0012] Furthermore, a first plane is formed on the outer wall of the extension column, the axis of the oil injection hole is perpendicular to the first plane, and the end of the oil injection hole facing the differential body is located in the first plane, which facilitates the machining of the oil injection hole.

[0013] Secondly, this application provides a lubrication system, which includes the aforementioned differential oil supply structure.

[0014] Furthermore, the lubrication system also includes an electric drive oil sump, a delivery pump, and a differential oil circuit. The electric drive oil sump contains lubricating oil; the delivery pump is connected to the electric drive oil sump; a first switching valve is installed on the differential oil circuit, and the differential oil circuit is connected to the differential oil supply structure through the first switching valve, which controls the opening and closing of the differential oil circuit.

[0015] Furthermore, the lubrication system also includes an oil cooler and a first filter. Along the direction of lubricating oil flow in the lubrication system, the first filter and the oil cooler are connected in sequence between the delivery pump and the differential oil circuit to reduce the temperature of the differential and other components that require lubrication.

[0016] Furthermore, the lubrication system also includes a first motor oil circuit, a second motor oil circuit, a first motor drive system oil circuit, a second motor drive system oil circuit, a bearing oil circuit, and a three-phase line oil circuit, all connected to the oil cooler. Lubricating oil is delivered to the first motor oil circuit, the second motor oil circuit, the first motor drive system oil circuit, the second motor drive system oil circuit, the bearing oil circuit, the differential oil circuit, and the three-phase line oil circuit via a delivery pump, reducing the number of delivery pumps and thus simplifying the structure of the lubrication system.

[0017] By aligning the oil injection nozzle with the planetary gear shaft, the lubricating oil sprayed through the nozzle can splash under the action of the planetary gear shaft, thereby facilitating better lubrication of the various components of the differential and improving the lubrication effect of the differential. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the differential oil supply structure provided in this application.

[0020] Figure 2 yes Figure 1 The diagram shows a cross-sectional view of the differential oil supply structure.

[0021] Figure 3 yes Figure 1 The diagram shows the structure of the differential with its oil supply system.

[0022] Figure 4 yes Figure 2 A magnified view of part A of the differential oil supply structure shown.

[0023] Figure 5 yes Figure 3 The diagram shows the structure of the planetary gear shaft of the differential.

[0024] Figure 6 This is a schematic diagram of the lubrication system provided in this application.

[0025] Explanation of reference numerals in the attached drawings: Differential body 1, Differential bracket 101, Opening 1011, Half shaft gear 102, Planetary gear 103, Planetary gear shaft 104, Injection zone 1041, Groove 1042, Oil guide groove 1043, Connecting groove 1044, Housing 2, Housing cavity 201, Injection hole 202, Oil supply passage 203, Extension column 204, First plane 2041, Electric drive oil sump 3, Delivery pump 4, Differential oil passage 5, First switching valve 501, Oil cooler 6, First filter 7, First motor oil passage 8, First proportional flow valve 801, Second motor oil passage 9, Second proportional flow valve 901, First motor transmission system oil passage 10, Second motor transmission system oil passage 11, Bearing oil passage 12, Three-phase line oil passage 13, Second switching valve 1301, Second filter 14. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] Firstly, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, as one implementation, this application provides a differential oil supply structure for providing lubricating oil to the differential body 1, thereby improving the lubrication of the differential body 1 and increasing the service life of the differential body 1.

[0028] like Figure 1 and Figure 2 As shown, the differential oil supply structure includes a housing 2, which encloses a housing cavity 201 for mounting the differential body 1 onto the housing 2.

[0029] like Figure 3 As shown, the differential body 1 includes a differential bracket 101, two half-shaft gears 102, two planetary gears 103, and a planetary gear shaft 104. The differential bracket 101 encloses a bracket compartment. Both half-shaft gears 102 are installed inside the bracket compartment, and the two half-shaft gears 102 are coaxial and arranged opposite to each other. The two planetary gears 103 are installed in the bracket compartment via the same planetary gear shaft 104, and the two planetary gears 103 are coaxial and arranged opposite to each other. Each planetary gear 103 meshes with two half-shaft gears 102.

[0030] An opening 1011 is formed on the differential bracket 101, which communicates with the bracket housing. The half-shaft gear 102 and the planetary gear 103 are both installed into the differential bracket 101 through the opening 1011.

[0031] like Figure 4 As shown, the differential oil supply structure includes an oil injection hole 202 and an oil supply passage 203 located in the housing 2. The oil supply passage 203 is connected to an external lubrication system, and the lubrication system delivers lubricating oil to the oil supply passage 203. The oil injection hole 202 is connected to the oil supply passage 203. The axis of the oil injection hole 202 is perpendicular to the axis of the half-shaft gear 102. Along the axial direction of the oil injection hole 202, the projection of the oil injection hole 202 is located within the projection range of the planetary gear shaft 104, that is, the oil injection hole 202 is set towards the planetary gear shaft 104.

[0032] Oil is sprayed towards the differential body 1 through the oil injection hole 202, thereby lubricating the various components of the differential body 1.

[0033] The differential bracket 101 rotates around the axis of the half-shaft gear 102. During the operation of the differential body 1, the differential bracket 101 includes a first state and a second state.

[0034] When the differential bracket 101 is in the first state, the opening 1011 is located between the oil injection hole 202 and the planetary gear shaft 104, so that the lubricating oil sprayed from the oil injection hole 202 is sprayed onto the planetary gear shaft 104 through the opening 1011. The high-pressure lubricating oil splashes after being sprayed onto the planetary gear shaft 104, thereby better lubricating the various components of the differential body 1 and improving the lubrication effect of the differential body 1.

[0035] When the differential bracket 101 is in the second state, the opening 1011 is misaligned with the oil injection hole 202 and the planetary gear shaft 104, so that the lubricating oil sprayed from the oil injection hole 202 is sprayed onto the differential bracket 101, so that the lubricating oil lubricates the components around the differential body 1.

[0036] To more clearly illustrate the technical solution of this application, the following definitions are provided: Figure 1 The directions shown are up, down, left, and right. The axial direction of the fuel injection hole 202 is... Figure 1 The vertical direction is shown. The axial direction of the half-shaft gear 102 is... Figure 1 The left and right directions are shown.

[0037] As one implementation method, the axis of the oil injection hole 202 is located in the same plane as the axis of the half-shaft gear 102, which further enables the lubricating oil injected from the oil injection hole 202 to splash more evenly onto each component of the differential body 1.

[0038] As one implementation method, along the axial direction of the oil injection hole 202, the center of the projection of the oil injection hole 202 coincides with the midpoint of the projection of the planetary gear shaft 104 axis, so that the lubricating oil injected from the oil injection hole 202 can be more evenly splashed to various components of the differential body 1.

[0039] like Figure 4 As shown, in one implementation, the inner diameter of the oil injection hole 202 is R1, and the inner diameter of the oil supply passage 203 is R2, satisfying: 0.1≤R1 / R2≤0.3.

[0040] By setting the above, the inner diameter of the oil injection hole 202 is avoided to be too large, and the pressure of the lubricating oil sprayed through the oil injection hole 202 is guaranteed, thereby ensuring that the lubricating oil can be more evenly splashed to each component of the differential body 1, and improving the lubrication effect of the differential body 1.

[0041] By setting the above, the inner diameter of the oil injection hole 202 is prevented from being too small, ensuring that the oil injection hole 202 sprays out a sufficient amount of lubricating oil, thereby ensuring that the lubricating oil can better lubricate the various components of the differential body 1.

[0042] Optionally, the ratio of the inner diameter of the injection port 202 to the inner diameter of the oil supply passage 203 can be any value between 0.1 and 0.3. For example: 0.1, 0.15, 0.2, 0.25, 0.3.

[0043] like Figure 5 As shown, as one implementation, the differential oil supply structure also includes an injection zone 1041 located on the planetary gear shaft 104 (e.g., Figure 5 (As shown in the dashed area), along the axial direction of the oil injection hole 202, the projection of the planetary gear shaft 104 covers the projection range of the injection area 1041; along the circumference of the planetary gear shaft 104, multiple grooves 1042 are formed in the injection area 1041. By setting the grooves 1042, the range of splashing of lubricating oil after impacting the planetary gear shaft 104 is increased, thereby better lubricating the various components of the differential body 1.

[0044] Specifically, along the axial direction of the planetary gear shaft 104, the size of the groove 1042 is the same as the size of the spray zone 1041.

[0045] Furthermore, adjacent grooves 1042 are spaced apart along the circumference of the planetary gear shaft 104, so that lubricating oil can be sprayed onto the circumferential wall of the planetary gear shaft 104 or into the grooves 1042, thereby changing the range of splashing of lubricating oil after impacting the planetary gear shaft 104, thus better lubricating the various components of the differential body 1.

[0046] As one implementation, a plurality of oil guide grooves 1043 are formed on the circumferential sidewall of the planetary gear shaft 104. The oil guide grooves 1043 extend along the axial direction of the planetary gear shaft 104, and one end of the oil guide grooves 1043 extends to the position where the planetary gear 103 is installed on the planetary gear shaft 104. By setting the oil guide grooves 1043, it is convenient to guide the lubricating oil to the planetary gear 103, so as to facilitate the lubrication of the planetary gear 103 by the lubricating oil, and further improve the lubrication effect of the differential body 1.

[0047] Specifically, along the axial direction of the planetary gear shaft 104, a plurality of oil guide grooves 1043 are located at both ends of the planetary gear shaft 104, and the plurality of oil guide grooves 1043 are evenly distributed on the circumferential sidewall of the planetary gear shaft 104.

[0048] As one implementation, multiple connecting grooves 1044 are formed on the circumferential sidewall of the planetary gear shaft 104. The two ends of the connecting grooves 1044 are connected to the oil guide groove 1043 and the groove 1042 respectively, so as to facilitate the lubricating oil to flow better into the oil guide groove 1043.

[0049] like Figure 2 and Figure 4 As shown, as one implementation, the differential oil supply structure also includes an extension post 204 located in the housing 2. The extension post 204 extends along the axial direction of the half-shaft gear 102 and is located inside the housing cavity 201. The oil supply passage 203 and the oil injection hole 202 are both located in the extension post 204.

[0050] By extending the column 204, it is easy to align the oil injection hole 202 with the center of the planetary gear shaft 104, so that the lubricating oil injected from the oil injection hole 202 can be more evenly splashed onto each component of the differential body 1.

[0051] In one implementation, the end of the oil supply passage 203 facing the housing cavity 201 is provided through the extension post 204, and the end of the oil supply passage 203 facing the housing cavity 201 is closed by the plunger.

[0052] like Figure 4 As shown, in one implementation, a groove is formed on the outer peripheral wall of the extension column 204, and a first plane 2041 is formed in the groove. The axis of the oil injection hole 202 is perpendicular to the first plane 2041, and the end of the oil injection hole 202 facing the differential body 1 is located in the first plane 2041.

[0053] The first plane 2041 facilitates the machining of the oil injection hole 202, ensuring that the axis of the oil injection hole 202 is perpendicular to the axis of the half-shaft gear 102, and further ensuring that the lubricating oil sprayed from the oil injection hole 202 can be sprayed onto the planetary gear shaft 104.

[0054] Secondly, such as Figure 6 As shown, as one implementation, this application also provides a lubrication system, which includes the above-mentioned differential oil supply structure and provides lubricating oil to the above-mentioned differential oil supply structure through the lubrication system.

[0055] As one implementation method, the lubrication system also includes an electric drive oil sump 3, a delivery pump 4, and a differential oil circuit 5. The electric drive oil sump 3 is used to hold lubricating oil, the delivery pump 4 is used to deliver lubricating oil, and the differential oil circuit 5 is used to deliver lubricating oil to the differential oil supply structure.

[0056] Specifically, the delivery pump 4 is connected to the electric drive oil tank 3, and the delivery pump 4 delivers the lubricating oil in the electric drive oil tank 3.

[0057] The differential oil circuit 5 is connected to the delivery pump 4 and the differential oil supply structure respectively. A first switching valve 501 is installed on the differential oil circuit 5. The differential oil circuit 5 is connected to the differential oil supply structure through the first switching valve 501. The opening and closing of the differential oil circuit 5 is controlled by the first switching valve 501.

[0058] By setting the first switching valve 501, the on / off control of the differential oil circuit 5 can be made according to the actual working conditions, which can reduce the energy consumption of the delivery pump 4.

[0059] The first switching valve 501 is an electromagnetic switching valve.

[0060] When the speed difference between the two half-shaft gears 102 is continuously greater than a set value, such as >100rpm, and the duration is greater than a preset time, such as >1.5s, the first switching valve 501 is opened to achieve internal lubrication of the differential body 1 and improve the service life of the differential body 1.

[0061] As one implementation, the lubrication system also includes an oil cooler 6 and a first filter 7. The oil cooler 6 is used to reduce the temperature of the lubricating oil so as to reduce the temperature of the differential body 1 and other components that require lubrication through the lubricating oil.

[0062] Along the flow direction of lubricating oil in the lubrication system, the first filter 7 and the oil cooler 6 are connected in sequence between the delivery pump 4 and the differential oil circuit 5. The first filter 7 filters the lubricating oil flowing into the oil cooler 6 to prevent the oil circuit at the rear end of the oil cooler 6 from becoming blocked.

[0063] As one implementation, the lubrication system also includes a second filter 14, which is installed at the front end of the delivery pump 4 and filters the lubricating oil entering the delivery pump 4.

[0064] As one implementation method, the lubrication system also includes a first motor oil circuit 8, a second motor oil circuit 9, a first motor transmission system oil circuit 10, a second motor transmission system oil circuit 11, a bearing oil circuit 12, and a three-phase line oil circuit 13. The first motor oil circuit 8, the second motor oil circuit 9, the first motor transmission system oil circuit 10, the second motor transmission system oil circuit 11, the bearing oil circuit 12, and the three-phase line oil circuit 13 are respectively connected to the oil cooler 6. The lubricating oil is delivered to the first motor oil circuit 8, the second motor oil circuit 9, the first motor transmission system oil circuit 10, the second motor transmission system oil circuit 11, the bearing oil circuit 12, the differential oil circuit 5, and the three-phase line oil circuit 13 by the delivery pump 4.

[0065] The lubricating oil from the electric drive oil tank 3 is delivered to the first motor oil circuit 8, the second motor oil circuit 9, the first motor transmission system oil circuit 10, the second motor transmission system oil circuit 11, the bearing oil circuit 12, the differential oil circuit 5, and the three-phase line oil circuit 13 by a single delivery pump 4. This greatly reduces the number of delivery pumps 4, thereby simplifying the structure of the lubrication system, reducing the control cost of the lubrication system, and reducing the space occupied by the lubrication system.

[0066] As one implementation method, a second switching valve 1301 is installed on the three-phase oil circuit 13. The three-phase oil circuit 13 is used to spray oil onto the three-phase lines of the motor. The second switching valve 1301 controls the opening and closing of the three-phase oil circuit 13 so that the three-phase oil circuit 13 can spray oil onto the three-phase lines of the motor as needed, thereby reducing the temperature of the three-phase lines of the motor.

[0067] As one implementation method, a first proportional flow valve 801 is installed on the first motor oil circuit 8. The flow rate through the first motor oil circuit 8 is controlled by the first proportional flow valve 801, so that the first motor oil circuit 8 can adapt to the different working conditions of the first motor.

[0068] As one implementation method, a second proportional flow valve 901 is installed on the second motor oil circuit 9. The flow rate through the second motor oil circuit 9 is controlled by the second proportional flow valve 901, so that the second motor oil circuit 9 can adapt to the different operating conditions of the second motor.

[0069] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A differential oil supply structure for supplying lubricating oil to a differential body (1), the differential oil supply structure comprising a housing (2), the housing (2) enclosing a housing cavity (201) for mounting the differential body (1) inside the housing (2); The differential body (1) includes a differential bracket (101), two half-shaft gears (102), two planetary gears (103) and a planetary gear shaft (104). The differential bracket (101) encloses a bracket compartment. The two half-shaft gears (102) are installed in the bracket compartment and are coaxial. The two planetary gears (103) are installed in the bracket compartment through the planetary gear shaft (104). Its features are, The differential oil supply structure includes: an oil injection hole (202) and an oil supply passage (203) provided in the housing (2). The oil injection hole (202) is connected to the oil supply passage (203). The axis of the oil injection hole (202) is perpendicular to the axis of the half shaft gear (102). Along the axial direction of the oil injection hole (202), the projection of the oil injection hole (202) is located within the projection range of the planetary gear shaft (104). An opening (1011) is formed on the differential bracket (101), and the oil injection hole (202) sprays lubricating oil to the planetary gear shaft (104) through the opening (1011).

2. The differential oil supply structure according to claim 1, characterized in that, The axis of the oil injection hole (202) and the axis of the half-shaft gear (102) are located in the same plane.

3. The differential oil supply structure according to claim 1, characterized in that, The inner diameter of the oil injection hole (202) is R1, and the inner diameter of the oil supply passage (203) is R2, satisfying: 0.1≤R1 / R2≤0.

3.

4. The differential oil supply structure according to claim 1, characterized in that, The differential oil supply structure also includes an injection zone (1041) located on the planetary gear shaft (104). Along the axial direction of the oil injection hole (202), the projection of the planetary gear shaft (104) covers the projection range of the injection zone (1041). Along the circumference of the planetary gear shaft (104), a plurality of grooves (1042) are formed in the spray area (1041).

5. The differential oil supply structure according to claim 1, characterized in that, A plurality of oil guide grooves (1043) are formed on the circumferential sidewall of the planetary gear shaft (104). The oil guide grooves (1043) extend along the axial direction of the planetary gear shaft (104), and one end of the oil guide grooves (1043) extends to the position where the planetary gear (103) is installed on the planetary gear shaft (104).

6. The differential oil supply structure according to claim 1, characterized in that, The differential oil supply structure also includes an extension post (204) disposed in the housing (2). The extension post (204) is located in the housing cavity (201). The oil supply passage (203) and the oil injection hole (202) are both located in the extension post (204).

7. The differential oil supply structure according to claim 6, characterized in that, A first plane (2041) is formed on the outer peripheral wall of the extension column (204), the axis of the oil injection hole (202) is perpendicular to the first plane (2041), and the end of the oil injection hole (202) facing the differential body (1) is located in the first plane (2041).

8. A lubrication system, characterized in that, The lubrication system includes the differential oil supply structure as described in any one of claims 1-7.

9. The lubrication system according to claim 8, characterized in that, The lubrication system also includes: An electric drive oil tank (3) contains lubricating oil; A delivery pump (4) is connected to the electrically driven oil tank (3); Differential oil circuit (5), a first switching valve (501) is installed on the differential oil circuit (5), the differential oil circuit (5) is connected to the differential oil supply structure through the first switching valve (501), and the opening and closing of the differential oil circuit (5) is controlled by the first switching valve (501).

10. The lubrication system according to claim 9, characterized in that, The lubrication system also includes an oil cooler (6) and a first filter (7). Along the flow direction of the lubricating oil in the lubrication system, the first filter (7) and the oil cooler (6) are connected in sequence between the delivery pump (4) and the differential oil circuit (5).

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