A high-efficiency self-lubricating inter-axle differential structure

Abstract

The present invention relates to a high-efficiency self-lubricating inter-axle differential structure, comprising a mid-axle reducer housing, a main shaft mounted within the mid-axle reducer housing, a cylindrical gear, a differential gear, a cross-shaft assembly, and a rear gear sleeved thereon, a differential housing disposed outside the differential gear and cross-shaft assembly, an oil shield connected between the differential housing and the inner wall of the mid-axle reducer housing, a springless lip oil seal mounted between the differential housing and the cylindrical gear, a radial needle roller bearing mounted between the cylindrical gear and the main shaft, an end thrust bearing sleeved thereon, the end thrust bearing abutting the end face of the cylindrical gear; the differential gear and cross-shaft assembly being positioned between the cylindrical gear and the rear gear, each differential gear meshing with the cylindrical gear and the rear gear; an oil filter unit disposed above the end thrust bearing, the oil filter unit mounted on the inner top wall of the mid-axle reducer housing. This high-efficiency self-lubricating inter-axle differential structure has excellent lubrication performance.

Description

Technical Field

[0001] The present invention relates to the technical field of differentials, and in particular to a high-efficiency self-lubricating inter-axle differential structure. Background Art

[0002] In four-wheel drive, in order to drive the four wheels, all the wheels must be connected. If the four wheels are mechanically connected together, the car cannot rotate at the same speed when driving in a curve. In order to make the car's rotation speed basically consistent when driving in a curve, an inter-axle differential is needed to adjust the speed difference between the front and rear wheels.

[0003] The gears and shafts within the differential require lubrication. Poor lubrication of the friction surfaces of the components can lead to excessive heat generation, which in turn affects transmission efficiency. Therefore, the effectiveness of the differential's internal lubrication is directly related to its performance. Furthermore, the meshing transmission between the gears during operation within the differential can cause wear, and metal debris mixed in the lubricant can also affect lubrication. Therefore, timely replacement of the internal lubricant is essential.

[0004] In order to solve the above technical problems, the present invention provides a high-efficiency self-lubricating inter-axle differential structure. Summary of the Invention

[0005] The present invention aims to solve the technical problems existing in the prior art and provides a high-efficiency self-lubricating inter-axle differential structure.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: a high-efficiency self-lubricating inter-axle differential structure, including a mid-bridge reducer housing, a main shaft is installed inside the mid-bridge reducer housing, a cylindrical gear, a differential gear and a cross shaft assembly, and a rear gear are sleeved on the main shaft, a differential housing is provided on the outside of the differential gear and the cross shaft assembly, an oil shield is connected between the differential housing and the inner wall of the mid-bridge reducer housing, a spring-free lip oil seal is installed between the differential housing and the cylindrical gear, an oil channel is provided between the rear gear and the mid-bridge reducer housing, and the The rear gear is provided with an oil through hole, and a radial needle roller bearing is installed between the cylindrical gear and the main shaft. The main shaft is also provided with an end thrust bearing, and the end thrust bearing abuts the end face of the cylindrical gear; the differential gear and cross shaft assembly includes an axial difference cross shaft and two differential gears. The differential gear and cross shaft assembly is located between the cylindrical gear and the rear gear, and each differential gear is meshed with the cylindrical gear and the rear gear; an oil filter unit is provided on the upper side of the end thrust bearing, and the oil filter unit is installed on the inner top wall of the mid-axle reducer housing.

[0007] Preferably, in the above-mentioned high-efficiency self-lubricating inter-axle differential structure, the oil filter unit includes two groups of filter components, the filter components include a flexible filter screen and a C-shaped slot, the top of the flexible filter screen is connected to a metal insert, the bottom of the flexible filter screen is connected to a bending hopper, the C-shaped slot is fixed on the inner top wall of the mid-bridge reducer housing, the metal insert is inserted into the inside of the C-shaped slot, and the bending hopper is provided with a plurality of mesh holes.

[0008] Preferably, in the above-mentioned high-efficiency self-lubricating inter-axle differential structure, the end of the C-shaped slot is connected to an inlet hose, the cross-section of the inlet hose is the same as the cross-section of the C-shaped slot, the metal insert is inserted into the interior of the inlet hose, the end of the metal insert is connected to a pull ring, the pull ring is located outside the inlet hose, and a rectangular opening is provided on the top of the mid-bridge reducer housing, the rectangular opening is located between the two groups of filter components, a sealing cover is installed at the rectangular opening, and the length direction of the rectangular opening is perpendicular to the plane where the flexible filter screen is located.

[0009] Preferably, in the above-mentioned high-efficiency self-lubricating inter-axle differential structure, a plurality of expansion openings are equidistantly provided on the top of the flexible filter, and the C-shaped slot is arc-shaped in the length direction.

[0010] Preferably, in the above-mentioned high-efficiency self-lubricating inter-axle differential structure, a necking is provided on the top of the bending hopper, and a bell mouth is provided on the upper side of the necking.

[0011] Preferably, in the above-mentioned high-efficiency self-lubricating inter-axle differential structure, a plurality of partitions are equidistantly arranged inside the bending hopper, and the partitions are perpendicular to the flexible filter screen.

[0012] The present invention provides the following beneficial effects: It adds a springless lip oil seal between the differential housing and the cylindrical gear, ensuring internal oil circulation. This internal oil circulation lubricates the differential gears and the cross-shaft assembly, reducing oil loss during churning and ensuring adequate lubrication of the radial needle roller bearings and end thrust bearings. The use of a springless lip oil seal reduces the seal's shaft-binding resistance. The present invention utilizes an oil filtration unit to automatically filter the internal lubricating oil, facilitating removal, cleaning, and replacement of the two filter assemblies, thereby improving oil quality and lubrication effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the internal structure of the present invention;

[0014] Figure 2 is a schematic diagram of the cross-sectional structure of the oil filter unit;

[0015] Figure 3 This is a schematic diagram of the installation structure of the oil filter unit;

[0016] Figure 4 for Figure 3 A partial enlarged view of point A in the middle;

[0017] Figure 5 for Figure 4 Schematic diagram of the structure when the flexible filter is taken out;

[0018] Figure 6 This is a schematic diagram of the installation structure of the sealing cover from a top view;

[0019] Figure 7 for Figure 6 Schematic diagram of the structure after the middle sealing cover is removed.

[0020] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0021] 1. Mid-axle reducer housing, 2. Rear gear, 3. Rear gear bearing, 4. Oil shield, 5. Differential gear and cross shaft assembly, 6. Differential housing, 7. Spring-free lip oil seal, 8. Cylindrical gear, 9. End thrust bearing, 10. Radial needle roller bearing, 11. Main shaft, 12. Flexible filter screen, 13. Metal insert, 14. Bending hopper, 15. C-type slot, 16. Sealing cover, 17. Expansion port, 18. Pull ring, 19. Inlet hose, 20. Rectangular opening, 21. Oil channel, 22. Oil through hole. DETAILED DESCRIPTION

[0022] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0023] like Figure 1 As shown, a high-efficiency, self-lubricating inter-axle differential structure includes a mid-axle reducer housing 1, within which a main shaft 11 is mounted. A cylindrical gear 8, a differential gear and cross shaft assembly 5, and a rear gear 2 are sleeved on the main shaft 11. A rear gear bearing 3 is mounted between the rear gear 2 and the mid-axle reducer housing 1. The differential gear and cross shaft assembly 5 includes an axle differential cross shaft and two differential gears. The differential gear and cross shaft assembly 5 is located between the cylindrical gear 8 and the rear gear 2, and each differential gear meshes with the cylindrical gear 8 and the rear gear 2. The axle differential cross shaft is splined to the main shaft 11. The rear gear 2 is rotationally connected to the main shaft 11. A radial needle roller bearing 10 is mounted between the cylindrical gear 8 and the main shaft 11. An end thrust bearing 9 is also sleeved on the main shaft 11 , and the end thrust bearing 9 abuts against the end face of the cylindrical gear 8 , which can effectively reduce the friction between the end face of the cylindrical gear 8 and the end face of the main shaft 11 .

[0024] A differential housing 6 is located outside the differential gear and cross-shaft assembly 5. An oil shield 4 is connected between the differential housing 6 and the inner wall of the mid-axle reducer housing 1. A springless lip oil seal 7 is installed between the differential housing 6 and the cylindrical gear 8. This allows the cylindrical gear 8, differential gear, cross-shaft assembly 5, and rear gear 2 to be located in a small space. An oil passage 21 is provided between the rear gear 2 and the mid-axle reducer housing 1, and an oil through hole 22 is provided on the rear gear 2. Gear oil is stirred by the outer driven gear, passing through oil passage 21. A small amount of oil enters the inner cavity between the main shaft 11 and the rear gear 2 through the oil hole 22 on the rear gear 2, lubricating the gear splines. A larger amount of oil enters the meshing area between the rear gear 2 and the differential gear through the contact gap between the rear gear bearing 3 and the rear gear 2, the internal gap between the differential gear and the cross shaft assembly 5, and the meshing area between the cylindrical gear 8 and the differential gear. Finally, it passes through the gaps in the radial needle roller bearing 10 and the end thrust bearing 9, and flows out through the end gap of the cylindrical gear 8 to the outer cavity (between the differential housing 6 and the mid-axle reducer housing 1). During this process, the differential gear and cross shaft assembly 5 are lubricated. A springless lip oil seal 7 is added between the differential housing 6 and the cylindrical gear 8 to ensure internal oil circulation, reduce oil loss during the oil stirring process, and ensure sufficient lubrication of the radial needle roller bearing 10 and the end thrust bearing 9.

[0025] An oil filter unit is provided on the upper side of the end thrust bearing 9 , and the oil filter unit is mounted on the inner top wall of the mid-axle reducer housing 1 .

[0026] like Figure 2 - Figure 5 As shown, the oil filter unit includes two sets of filter components, each comprising a flexible filter screen 12 and a C-shaped slot 15. The C-shaped slot 15 is fixed to the inner top wall of the mid-bridge reducer housing 1. A metal insert 13 is connected to the top of the flexible filter screen 12, and a bending hopper 14 is connected to the bottom of the flexible filter screen 12. The metal insert 13 is inserted into the interior of the C-shaped slot 15. The bending hopper 14 is provided with a plurality of mesh holes. The bending hopper 14 can be used to collect metal debris. The bending hopper 14 has a constriction at the top and a bell mouth on the upper side of the constriction to facilitate collection and prevent debris from flowing out from the upper side. Multiple partitions are equidistantly arranged inside the bending hopper 14, and the partitions are perpendicular to the flexible filter screen 12. The provision of the partitions can prevent debris from flowing out along the extension distribution direction of the bending hopper 14 when the oil filter unit is removed for cleaning.

[0027] The end of the C-shaped slot 15 is connected to an inlet hose 19, which has the same cross-section as the C-shaped slot 15. A metal insert 13 is inserted into the inlet hose 19, and a pull ring 18 is connected to the end of the metal insert 13. The pull ring 18 is located on the outside of the inlet hose 19. A rectangular opening 20 is provided at the top of the mid-axle reducer housing 1, located between the two filter assemblies. A sealing cap 16 is installed at the rectangular opening 20. The sealing cap 16 and rectangular opening 20 facilitate the removal, cleaning, and reinstallation of the filter assemblies. Because the top of the mid-axle reducer housing 1 is a circular arc, the C-shaped slot 15 is designed in an arc-like shape along its length. The flexible filter screen 12 is fan-shaped, with a larger circumference on the top than on the bottom. To facilitate lateral expansion and contraction of the top during installation and removal, multiple expansion openings 17 are evenly spaced at the top of the flexible filter screen 12.

[0028] like Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 As shown, the length direction of the rectangular opening 20 is perpendicular to the plane where the flexible filter screen 12 is located. In order to prevent lubricating oil leakage when installing and removing the filter assembly, the rectangular opening 20 is set at the top of the mid-bridge reducer housing 1. When removing, remove the bolts on the sealing cover 16, then remove the sealing cover 16, first take out one set of filter assemblies, pull the pull ring 18 in the assembly, pull out part of the flexible filter screen 12, bend it along the direction of the rectangular opening 20, and slowly remove it from the rectangular opening 20, then use the same method to take out the other set. The interior of the bending hopper 14 is equidistantly provided with multiple partitions, which are perpendicular to the flexible filter screen 12. The setting of the partitions can prevent debris from flowing out along the extension distribution direction of the bending hopper 14 when the oil filter unit is removed. After removal, clean the iron filings in the bending hopper 14 and then put it back. During installation, the end of the inlet hose 19 is pulled out to the outside of the rectangular opening 20, and the end of the metal insert 13 away from the pull ring 18 is inserted into the inlet hose 19, and the flexible filter screen 12 is snapped into the C-shaped opening of the inlet hose 19. The metal insert 13 is a metal wire with a certain toughness, such as iron wire, which can bend when encountering a certain resistance. After the filter assembly is installed, the pull ring 18 is placed into the rectangular opening 20. After both sets of filter assemblies are installed, the sealing cover 16 is closed and locked.

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, and a specific orientation structure and operation, and therefore, cannot be understood as limiting the present invention. In addition, "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0031] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A high-efficiency self-lubricating inter-axle differential structure, characterized by: The invention comprises a mid-bridge reducer housing (1), wherein a main shaft (11) is installed inside the mid-bridge reducer housing (1), a cylindrical gear (8), a differential gear and a cross shaft assembly (5), and a rear gear (2) are sleeved on the main shaft (11), a differential housing (6) is provided on the outside of the differential gear and the cross shaft assembly (5), an oil shield (4) is connected between the differential housing (6) and the inner wall of the mid-bridge reducer housing (1), a spring-free lip oil seal (7) is installed between the differential housing (6) and the cylindrical gear (8), an oil passage (21) is provided between the rear gear (2) and the mid-bridge reducer housing (1), and the An oil through hole (22) is provided on the rear gear (2), a radial needle bearing (10) is installed between the cylindrical gear (8) and the main shaft (11), and an end thrust bearing (9) is also sleeved on the main shaft (11), and the end thrust bearing (9) abuts against the end face of the cylindrical gear (8); the differential gear and cross shaft assembly (5) includes an axial difference cross shaft and two differential gears, and the differential gear and cross shaft assembly (5) is located between the cylindrical gear (8) and the rear gear (2), and each differential gear is meshed with the cylindrical gear (8) and the rear gear (2); an oil filter is provided on the upper side of the end thrust bearing (9). The oil filter unit is mounted on the inner top wall of the mid-bridge reducer housing (1), and the oil filter unit includes two groups of filter components, the filter components including a flexible filter screen (12) and a C-shaped slot (15), the top of the flexible filter screen (12) is connected to a metal insert (13), the bottom of the flexible filter screen (12) is connected to a bending hopper (14), the C-shaped slot (15) is fixed on the inner top wall of the mid-bridge reducer housing (1), the metal insert (13) is inserted into the inside of the C-shaped slot (15), the bending hopper (14) is provided with a plurality of meshes, and the end of the C-shaped slot (15) is connected to the metal insert (13). There is an inlet hose (19), the cross section of the inlet hose (19) is the same as the cross section of the C-shaped slot (15), the metal insert (13) is inserted into the interior of the inlet hose (19), the end of the metal insert (13) is connected to a pull ring (18), the pull ring (18) is located outside the inlet hose (19), the top of the mid-bridge reducer housing (1) is provided with a rectangular opening (20), the rectangular opening (20) is located between the two groups of filter components, a sealing cover (16) is installed at the rectangular opening (20), and the length direction of the rectangular opening (20) is perpendicular to the plane where the flexible filter screen (12) is located.

2. The high-efficiency self-lubricating inter-axle differential structure according to claim 1, characterized in that: The top of the flexible filter screen (12) is provided with a plurality of expansion openings (17) at equal intervals, and the C-shaped slot (15) is arc-shaped in the length direction.

3. The high-efficiency self-lubricating inter-axle differential structure according to claim 1, characterized in that: The top of the bending hopper (14) is provided with a necking opening, and the upper side of the necking opening is provided with a bell mouth.

4. The high-efficiency self-lubricating inter-axle differential structure according to claim 1, characterized in that: A plurality of partitions are equidistantly arranged inside the bending hopper (14), and the partitions are perpendicular to the flexible filter screen (12).

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