Differential, vehicle driveline assembly, and vehicle

Abstract

This utility model relates to vehicles, specifically providing a differential, a vehicle transmission assembly, and a vehicle, aiming to solve the problem of excessive internal oil pressure affecting the sealing effect of the oil seal in the differential. To this end, the differential of this utility model includes: a support base with a first through hole, the inner wall of which has an annular groove; an input shaft; and an adjusting ring disposed within the annular groove, with a clearance fit between the adjusting ring and the inner wall of the annular groove, allowing oil to flow through the gap on both sides of the adjusting ring. This utility model, by setting an adjusting ring within the through hole of the differential support base and ensuring a clearance fit between it and the inner wall of the annular groove, achieves free flow of oil under normal operating conditions; when a large oil pressure difference occurs on both sides of the adjusting ring, the adjusting ring automatically adheres to the inner wall of the annular groove under pressure, promptly sealing the gap and effectively isolating the oil flow. This structure can dynamically adjust the internal oil pressure of the differential without changing the original arrangement.

Description

Technical Field

[0001] This utility model relates to vehicles, specifically providing a differential, a vehicle transmission assembly, and a vehicle. Background Technology

[0002] With the development of new energy vehicles and electric drive systems, the integration level of electric drive assemblies is increasing. Key components such as differentials, motors, and reducers are often integrated into a compact housing structure to improve system efficiency and save space. In coaxial electric drive systems, the motor shaft is usually a hollow structure to accommodate the half-shafts and transmit power to the vehicle's drive wheels through the differential. However, due to structural limitations, an assembly gap inevitably exists between the motor shaft and the differential support. This gap can become a channel for lubricating oil in the gearbox to leak into high-speed rotating parts, thus affecting the stability of the sealing system.

[0003] In existing technologies, high-speed oil seals are commonly used on half-shafts to achieve sealing and isolation between the motor housing and the gearbox oil. However, high-speed oil seals have extremely high requirements for fit dimensions, sealing pressure, and cleanliness under high speed and high oil pressure environments. If encountering oil pressure fluctuations, foreign object intrusion, or poor fit, seal failure is highly likely. Once oil leaks into the motor housing, it may not only react incompatiblely with the winding insulation varnish or impregnation material, leading to a decrease in motor insulation performance, but may also cause functional failures in the entire vehicle's electric drive system. In particular, a large accumulation of oil in the differential can easily lead to excessively high oil pressure in the oil-side cavity of the oil seal, exceeding the sealing limit of the oil seal, causing oil seal damage or oil leakage, seriously affecting the operational safety and reliability of the electric drive system. Traditional sealing structures mainly rely on the oil seal body for sealing, lacking the ability to adaptively adjust to changes in oil pressure, making it difficult to solve the sealing risks caused by sudden changes in oil pressure from a system perspective.

[0004] Therefore, there is an urgent need in the field for a differential, vehicle transmission components, and a vehicle to solve the above problems. Utility Model Content

[0005] The present invention aims to solve the above-mentioned technical problems, namely, to solve the problem that excessive oil pressure inside the differential affects the sealing effect of the oil seal.

[0006] In a first aspect, the present invention provides a differential, the differential comprising:

[0007] A support base is provided with a first through hole, and an annular groove is provided on the inner wall of the first through hole;

[0008] An input shaft passes through the first through hole;

[0009] An adjusting ring is sleeved on the input shaft and extends into the annular groove. The adjusting ring is in clearance fit with the inner wall of the annular groove so that the oil on both sides of the adjusting ring can flow through the gap.

[0010] When the oil pressure difference on both sides of the adjusting ring is greater than a preset value, the pressure difference can drive the adjusting ring to fit against the inner wall of the annular groove to close the gap.

[0011] In a specific embodiment of the differential described above, the adjusting ring is provided with a notch, and the adjusting ring can elastically deform along the notch.

[0012] In the specific implementation of the above differential, the cut is set at an angle.

[0013] In the specific embodiment of the above differential, the adjusting ring is made of polytetrafluoroethylene.

[0014] In a specific embodiment of the differential described above, the differential further includes a half-shaft, a second through hole is provided in the input shaft, the half-shaft passes through the second through hole, and the input shaft is drively connected to the half-shaft.

[0015] In a specific embodiment of the above differential, the differential further includes an oil seal, which is disposed in the second through hole and fits against the inner wall of the second through hole and the outer wall of the half shaft;

[0016] One side of the adjusting ring is connected to the oil side of the oil seal.

[0017] In the specific implementation of the above differential, the oil seal is made of rubber or polytetrafluoroethylene.

[0018] In the specific embodiment of the above differential, the half-shaft connects to the wheel; and / or

[0019] The input shaft is connected to the motor.

[0020] In a second aspect, the present invention provides a vehicle transmission assembly including the aforementioned differential.

[0021] In a third aspect, the present invention provides a vehicle that includes the aforementioned vehicle transmission components.

[0022] By employing the above technical solution, this utility model sets an adjusting ring within the through hole of the differential support, creating a clearance fit between the adjusting ring and the inner wall of the annular groove. Under normal differential operation, this allows for free flow of lubricating oil within the structure, without affecting oil circulation and cooling within the system. When a significant oil pressure difference occurs on both sides of the adjusting ring, the adjusting ring automatically moves towards the lower pressure side under pressure differential drive, thus fitting against the inner wall surface of the annular groove, promptly sealing the gap, effectively blocking further oil flow, and preventing further increase in oil pressure within the differential, thereby preventing oil seal failure and leakage due to excessive oil pressure. This structure enables dynamic adjustment and adaptive sealing of the oil pressure state inside the differential, significantly improving the sealing performance of the differential in electric drive systems, thereby enhancing the operational reliability and stability of the entire electric drive system, and is particularly suitable for sealing control requirements under complex operating conditions such as high speed and high load.

[0023] Furthermore, this invention provides the adjusting ring with a notch, giving it excellent elastic deformation capability. This structure not only improves the flexibility of the adjusting ring during installation but also facilitates its radial contraction along the notch direction under stress, making it easier to manually assemble into the annular groove within the differential support. This effectively simplifies the assembly process, improves assembly efficiency, and reduces reliance on automated assembly equipment and overall manufacturing costs. Simultaneously, during operation, the adjusting ring automatically adjusts its deformation according to changes in internal oil pressure, thus altering its fit with the groove wall: when the oil pressure in the differential is low, the adjusting ring maintains a certain gap with the annular groove to allow free oil flow; when the oil pressure is high, the adjusting ring undergoes elastic deformation under pressure, fitting and sealing the gap in the annular groove wall, providing a dynamic seal. This structure effectively improves the adaptability and reliability of the differential sealing structure under complex and variable operating conditions, enhancing not only the service life of the sealing system but also the operational stability of the entire vehicle's electric drive system.

[0024] Furthermore, by setting the cut on the adjusting ring at an angle, this invention effectively prevents the formation of a through-line channel at the cut while ensuring the adjusting ring has good elastic deformation capability. This significantly reduces the risk of oil or external impurities leaking or entering the system through the cut. This structure not only does not adversely affect the adjusting ring's shrinkage and deformation capability during assembly, but also maintains its good assembly convenience and flexibility. It allows for quick manual installation into the annular groove of the differential support without the need for special tools, improving assembly efficiency. Simultaneously, it further enhances the overall sealing effect and reliability of the adjusting ring. Through the application of this structure, the differential can maintain a stable sealing state even under complex operating conditions such as high temperature, high pressure, or severe vibration, thereby enhancing the system's durability and protection capabilities.

[0025] Furthermore, this invention achieves a compact and efficient coaxial arrangement by providing a second through hole within the input shaft and allowing the half-shaft to pass through it. This structure not only optimizes the power transmission path of the entire transmission system and reduces the design complexity of intermediate transition structures, but also significantly saves longitudinal space in the shaft system, improving the rationality and compactness of the arrangement, making it particularly suitable for space-constrained electric drive system structures. Simultaneously, an oil seal is installed within the second through hole, sealingly fitting against the inner wall of the second through hole and the outer wall of the half-shaft, effectively sealing the gap between them, significantly improving sealing performance, and preventing axial leakage of oil. One side of the adjusting ring is connected to the oil side of the oil seal, creating a controllable oil flow channel between the differential and the oil seal. This helps to dynamically balance the pressure difference between the inside and outside of the differential during system operation, further reducing the risk of oil seal failure due to pressure differential. Through the above structural design, the sealing reliability and overall operational stability of the transmission components under high speed, high load, and complex operating conditions are effectively improved. Attached Figure Description

[0026] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which:

[0027] Figure 1 This is a schematic diagram of the differential provided by this utility model;

[0028] Figure 2 This is a schematic diagram of the input shaft of the differential provided by this utility model;

[0029] Figure 3 This is a schematic diagram of the installation structure of the adjustment ring of the differential provided by this utility model;

[0030] Figure 4 This is a schematic diagram of the structure of the differential support base provided by this utility model;

[0031] Figure 5 This is a schematic diagram of the structure of the adjusting ring of the differential provided by this utility model;

[0032] Figure 6 This is a schematic diagram of the differential adjustment ring in the closed clearance state provided by this utility model.

[0033] List of reference numerals in the attached diagram:

[0034] 1. Support base; 11. First through hole; 12. Annular groove;

[0035] 2. Input shaft; 21. Second through hole;

[0036] 3. Adjusting ring; 31. Incision;

[0037] 4. Half shaft; 5. Oil seal. Detailed Implementation

[0038] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0039] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," which indicate directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] To address the problem of excessive internal oil pressure in the differential affecting the sealing effect of the oil seal, this embodiment discloses a vehicle. The vehicle includes a transmission assembly, which includes a differential. (Refer to...) Figure 1 The differential includes an input shaft 2, a half shaft 4, and a support base 1.

[0042] Input shaft 2 is connected to a motor, which provides driving force to input shaft 2, thereby causing it to rotate. (See reference...) Figure 2 The input shaft 2 is provided with a second through hole 21, which extends along the axial direction of the input shaft 2, making the input shaft 2 a hollow tubular structure. (Refer to...) Figure 1The half-shaft 4 passes through the second through hole 21, and the half-shaft 4 and the second through hole 21 are in a clearance fit relationship, so that the half-shaft 4 and the input shaft 2 can be structurally independent and can rotate independently without interfering with each other. One end of the input shaft 2 is connected to the differential, serving as the input shaft 2 of the differential, used to transmit the torque output by the motor to the inside of the differential. One end of the half-shaft 4 is connected to the differential, serving as the output shaft of the differential. The input shaft 2 and the half-shaft 4 are connected in a driving connection, continuing to transmit the torque output by the motor to the half-shaft 4. The other end of the half-shaft 4 is connected to the wheel, and the wheel can rotate with the half-shaft 4, thus ultimately achieving the purpose of driving the vehicle. This structure utilizes the hollow space of the input shaft 2 to achieve the coaxial arrangement of the input shaft 2 and the half-shaft 4, resulting in a compact structure, efficient power transmission, and improved layout flexibility and operational stability of the vehicle's power system.

[0043] Reference Figure 3 An oil seal 5 is installed inside the second through hole 21. The oil seal 5 fits against the inner wall of the second through hole 21 and the outer wall of the half shaft 4, thus forming a reliable sealing interface. This effectively seals the annular gap between the second through hole 21 of the input shaft 2 and the half shaft 4, preventing oil leakage along the gap. One side of the oil seal 5 connects to the interior of the differential, allowing the lubricating oil inside the differential to flow within a controlled range without seeping into the motor area at the other end of the input shaft 2. This avoids the lubricating oil contaminating the motor or affecting its normal operation, thereby significantly improving the sealing integrity and operational reliability of the entire electric drive system. Furthermore, to ensure that the oil seal 5 has good durability and sealing performance under complex operating conditions such as high temperature, high speed, or high pressure, the oil seal 5 is preferably made of rubber or polytetrafluoroethylene material, which has excellent wear resistance, corrosion resistance, and high temperature resistance, and can work stably for a long time, meeting the sealing requirements of various complex application scenarios.

[0044] Support 1 is part of the differential housing and is primarily used to provide support for the input shaft 2 and ensure its stable mounting. (Refer to...) Figure 4 The support base 1 has a first through hole 11, through which the input shaft 2 passes, allowing the input shaft 2 to extend into the differential. An annular groove 12 is provided on the inner wall of the first through hole 11. (Refer to...) Figure 3 An adjusting ring 3 is installed within the annular groove 12 and is fitted onto the outer wall of the input shaft 2. The adjusting ring 3 and the annular groove 12 are clearance-fitted, creating a passage between the adjusting ring 3 and the annular groove 12 that connects the inside and outside of the differential. Oil can flow into the differential through this passage. In other words, the side of the adjusting ring 3 closest to the differential is connected to the side of the oil seal 5 closest to the differential. This arrangement allows the adjusting ring 3 to regulate the pressure on the oil side of the oil seal 5, preventing the oil seal 5 from failing and leaking due to excessive pressure.

[0045] Reference Figure 5The adjusting ring 3 has a notch 31, which is angled. The adjusting ring 3 can elastically deform along the notch 31. When installing the adjusting ring 3, the operator can apply external force along the direction of the notch 31 to cause radial compression deformation, thereby temporarily reducing the outer diameter of the adjusting ring 3, making it easier to install into the annular groove 12 in the first through hole 11. After installation, the adjusting ring 3 can return to its original shape under the elastic action of the material. Furthermore, to meet the requirements of wear resistance, corrosion resistance, and high temperature adaptability during long-term use, the adjusting ring 3 is preferably made of polytetrafluoroethylene (PTFE). This material has excellent chemical stability and mechanical properties, and can work stably for a long time under various complex working conditions, ensuring the sealing reliability and operational safety of the system.

[0046] The working principle of the adjusting ring 3 is as follows: (Refer to...) Figure 3 Oil flows into the differential through the gap between the adjusting ring 3 and the annular groove 12, providing lubrication and cooling for the internal structure of the differential. The oil seal 5 seals the gap between the second through hole 21 and the half-shaft 4, effectively preventing oil leakage axially from the differential to the motor side, ensuring the integrity and reliability of the system seal. (Refer to...) Figure 6 When the oil pressure inside the differential is too high, this pressure exerts a force on the adjusting ring 3, causing it to fit tightly against the inner wall of the annular groove 12, thus automatically sealing the original clearance path. At this time, the oil flow channel between the adjusting ring 3 and the annular groove 12 is blocked, effectively limiting the entry of more oil into the differential and preventing further increases in internal oil pressure. Once the internal oil pressure is dynamically adjusted to a reasonable range, the adjusting ring 3 returns to its original state, allowing oil to flow into the differential. This design avoids the problem of oil seal 5 failing due to overpressure, ensuring that oil seal 5 maintains a stable sealing state under various operating conditions, thus improving the overall system's sealing performance and operational safety.

[0047] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A differential, characterized in that, include: A support base (1) is provided with a first through hole (11), and an annular groove (12) is provided on the inner wall of the first through hole (11). Input shaft (2), which passes through the first through hole (11); An adjusting ring (3) is sleeved on the input shaft (2) and extends into the annular groove (12). The adjusting ring (3) is in clearance fit with the inner wall of the annular groove (12) so that the oil on both sides of the adjusting ring (3) can flow through the gap. When the oil pressure difference on both sides of the adjusting ring (3) is greater than a preset value, the pressure difference can drive the adjusting ring (3) to fit against the inner wall of the annular groove (12) to close the gap.

2. The differential according to claim 1, characterized in that, The adjusting ring (3) is provided with a notch (31), and the adjusting ring (3) can be elastically deformed along the notch (31).

3. The differential according to claim 2, characterized in that, The cut (31) is set at an angle.

4. The differential according to claim 1, characterized in that, The regulating ring (3) is made of polytetrafluoroethylene.

5. The differential according to claim 1, characterized in that, The differential also includes a half shaft (4), and a second through hole (21) is provided in the input shaft (2). The half shaft (4) passes through the second through hole (21), and the input shaft (2) is connected to the half shaft (4) in a transmission connection.

6. The differential according to claim 5, characterized in that, The differential also includes an oil seal (5), which is disposed in the second through hole (21) and fits against the inner wall of the second through hole (21) and the outer wall of the half shaft (4); One side of the adjusting ring (3) is connected to the oil side of the oil seal (5).

7. The differential according to claim 6, characterized in that, The oil seal (5) is made of rubber or polytetrafluoroethylene.

8. The differential according to claim 5, characterized in that, The half-shaft (4) connects to the wheel; and / or The input shaft (2) is connected to the motor.

9. A vehicle transmission assembly, characterized in that, Including the differential as described in any one of claims 1-8.

10. A vehicle, characterized in that, Includes the vehicle transmission assembly as described in claim 9.

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