Fully-sealed welding differential assembly
Through the fully sealed welding design, the problem of poor lubrication performance in the open differential is solved, the sealing and adequacy of the lubricating medium is ensured, and the lubrication effect and NVH performance of the differential are significantly improved.
Patent Information
- Application Number
- CN202411431346.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-14
- Publication Date
- 2025-01-17
AI Technical Summary
The existing differentials have poor continuous lubrication performance due to the open design, resulting in wear and abnormal noise problems of internal parts.
Using a fully sealed welding differential assembly, the shell and main reduction gear are connected by welding to form a sealed structure, and the sealing structure and lubrication gaps are used to ensure the sealing of the lubricating medium, avoid leakage, and ensure the storage and use of sufficient lubricating medium. .
It achieves better lubrication effect, reduces parts wear and friction vibration, significantly reduces abnormal noise, and improves NVH performance.
Smart Images
Figure CN119321465A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of differentials, and in particular to a fully sealed welded differential assembly. Background Art
[0002] With the rapid development of new energy vehicles, market demand continues to increase. New energy vehicles have high starting torque and fast acceleration response, which improves the wear resistance of the transmission system. At the same time, users have higher and higher requirements for the comfort of the whole vehicle, which makes vehicle manufacturers have higher and higher requirements for the NVH (Noise, Vibration, Harshness) performance of reducers and internal differentials.
[0003] In the existing differential technology solutions, an open differential with a window is generally used. The open differential is located in the reducer. Through the lubrication structure in the reducer, the lubricating oil enters the open differential from the window to prevent abnormal wear of the internal components of the differential due to poor lubrication. However, due to the open differential case design, the continuous lubrication performance is poor, the internal sub-components are easy to wear, and abnormal noise problems are prone to cornering. Summary of the invention
[0004] The technical problem to be solved by the present invention is that the existing differential has poor continuous lubrication performance due to its open design, and the purpose is to provide a fully sealed welded differential assembly to solve the above problem.
[0005] The present invention is achieved through the following technical solutions:
[0006] A fully sealed welded differential assembly, comprising:
[0007] The housing has a first mounting groove with both ends connected to the outside;
[0008] The main reduction gear has a second mounting groove with both ends connected to the outside;
[0009] and, a transmission structure;
[0010] Among them, one end of the second mounting groove is sleeved on the shell and connected by welding, so that the first mounting groove is connected to the second mounting groove and forms a mounting groove for installing the transmission structure. Accordingly, the transmission structure is arranged on the mounting groove, and a lubrication gap for accommodating a lubricating medium is formed between the transmission structure and the mounting groove. Both ends of the mounting groove are connected to the transmission structure through a sealing structure.
[0011] In one possible design, the transmission structure includes a planetary gear shaft and a planetary gear. The planetary gear shaft is located in a mounting groove, and its two ends are respectively inserted into the housing. Correspondingly, the housing is provided with a clamping groove adapted to the planetary gear shaft, and two planetary gears are provided and arranged relatively on the planetary gear shaft.
[0012] In a possible design, both ends of the planetary gear shaft are configured as squares, and correspondingly, the engaging groove is configured as an adaptive shape so that the housing and the planetary gear shaft abut against each other.
[0013] In a possible design, the transmission structure includes two groups of bevel gear sets, one of which passes through the first installation slot and is connected to the planetary gear, and the other group passes through the second installation slot and is connected to the planetary gear.
[0014] In one possible design, the bevel gear set includes a half-shaft gear and a gear end cover. The half-shaft gear has two opposite ends, one end of which is configured to be inserted into the mounting groove and engage with the planetary gear as a connecting end, and the other end is configured to be a free end extending outward. The gear end cover is fixed to the connecting end of the half-shaft gear by welding; accordingly, the sealing structure is sleeved on the half-shaft gear.
[0015] In a possible design, the sealing structure is a sealing gasket, a sealing ring, a sealing ring or a sealing washer.
[0016] In a possible design, a spiral groove is provided at one end of the first installation groove adjacent to the sealing structure and at one end of the second installation groove adjacent to the sealing structure. The spiral groove is connected to the lubrication gap and is used to store the lubrication medium.
[0017] In one possible design, both the housing and the final reduction gear are made of low carbon steel or stainless steel, and the housing is formed by forging.
[0018] In a possible design, the housing is provided with an oil filling hole and a closing plug detachably arranged on the oil filling hole.
[0019] In a possible design, the main reduction gear includes a base shell and transmission teeth, the base shell is connected to the housing, and accordingly, the second mounting groove is located on the base shell, and the outer periphery of the base shell is formed into a tooth shape by grinding, and the tooth shape is configured as the transmission teeth.
[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:
[0021] The fully sealed welded differential assembly adopts a closed design, and each component forms a closed structure after being assembled, thereby reducing and avoiding as much as possible the leakage of the lubricating medium in the fully sealed welded differential assembly, ensuring that the fully sealed welded differential assembly has a sufficient amount of lubricating medium, ensuring the lubrication effect, reducing the wear and friction vibration of each component, greatly reducing the abnormal noise phenomenon during operation, and having good NVH performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:
[0023] Figure 1 The figure is a schematic diagram of the structure of a fully sealed welded differential assembly.
[0024] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure.
[0025] Figure 3 It is a schematic diagram of the structure of the shell.
[0026] Figure 4 This is a schematic diagram of the assembly of the half-shaft gear on the housing.
[0027] Figure 5 Assembly diagram of the half-shaft gear installed on the main reduction gear.
[0028] Marks and corresponding parts names in the attached drawings:
[0029] 1. Housing; 2. Main reduction gear; 201. Base housing; 202. Transmission teeth; 3. Transmission structure; 301. Planetary gear shaft; 302. Planetary gear; 303. Axle gear; 304. Gear end cover; 4. Sealing structure; 5. Spiral groove; 6. Closing bolt; 7. Gasket. DETAILED DESCRIPTION
[0030] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.
[0031] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to one of ordinary skill in the art that these specific details are not necessarily employed to practice the present invention. In other embodiments, in order to avoid obscuring the present invention, well-known structures, circuits, materials, or methods are not specifically described.
[0032] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0033] In the description of the present invention, the directions or positional relationships indicated by terms such as “front”, “rear”, “left”, “right”, “up”, “down”, “vertical”, “horizontal”, “high”, “low”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.
[0034] Example:
[0035] In the prior art, the differential adopts an open design, and a window is provided on the housing for the lubricant to enter. Similarly, the lubricant in the differential can also flow out from the window. Therefore, when the lubricant stored in the differential is less, the lubrication effect of the differential during operation becomes poor, especially during the startup phase. Furthermore, the wear of parts is aggravated, abnormal noise will occur, and the NVH performance is poor, affecting the comfort of use.
[0036] Based on this, the present invention proposes a fully sealed welded differential assembly, specifically: Figure 1-Figure 5 As shown, a fully sealed welded differential assembly comprises:
[0037] The housing 1 has a first mounting groove with both ends connected to the outside;
[0038] The main reduction gear 2 has a second mounting groove with both ends connected to the outside;
[0039] and, a transmission structure 3;
[0040] Among them, one end of the second mounting groove is sleeved on the shell 1 and connected by welding, so that the first mounting groove is connected to the second mounting groove and forms a mounting groove for installing the transmission structure 3. Accordingly, the transmission structure 3 is arranged on the mounting groove, and a lubrication gap for accommodating a lubricating medium is formed between the transmission structure 3 and the mounting groove. The two ends of the mounting groove are connected to the transmission structure 3 through a sealing structure 4.
[0041] The fully sealed welded differential assembly adopts a closed design, and each component forms a closed structure after being assembled, thereby reducing and avoiding as much as possible the leakage of the lubricating medium in the fully sealed welded differential assembly, ensuring that the fully sealed welded differential assembly has a sufficient amount of lubricating medium, ensuring the lubrication effect, reducing the wear and friction vibration of each component, greatly reducing the abnormal noise phenomenon during operation, and having good NVH performance.
[0042] Specifically, first, the housing 1 and the main reduction gear 2 are connected by welding. The welding not only has good connection performance but also has good sealing performance, so that the connection between the housing 1 and the main reduction gear 2 is well sealed, avoiding leakage of the lubricating medium from the connection between the housing 1 and the main reduction gear 2.
[0043] Furthermore, the transmission structure 3 needs to extend to the outside and be connected to other components to transmit power. Therefore, both ends of the mounting groove are connected to the transmission structure 3 through the sealing structure 4. The sealing structure 4 improves the sealing performance and reduces the probability of leakage of the lubricating medium.
[0044] Finally, the main reduction gear 2 meshes with other components to achieve connection and transmit power. Based on this, the relevant components do not need to be plugged into the housing 1, and there is no need to open an adaptive window on the housing 1 and / or the main reduction gear 2, avoiding the window design in the existing design.
[0045] In summary, the fully sealed welded differential assembly replaces the open design with a closed design on the basis of realizing the differential function. When the fully sealed welded differential assembly is used in an automobile, the fully sealed welded differential assembly is isolated from the lubrication system of the reduction box. During the entire product life cycle, the internal lubricating medium of the fully sealed welded differential assembly is maintained at a sufficient and constant level, which can achieve a better lubrication effect and avoid the bonding wear problem caused by excessive torque increase and speed increase of the automobile.
[0046] Furthermore, the fully sealed welded differential assembly can be used for any suitable product, including but not limited to new energy vehicles and fuel vehicles. In addition, for automobiles, the abnormal noise comes from the friction vibration between the friction pairs, which is amplified step by step by the transmission system, thus eventually generating abnormal noise. In this regard, the fully sealed welded differential assembly ensures lubrication through a sealing design to reduce the generation of abnormal noise, and at the same time uses the lubricating medium to reduce the sound waves and reduce the external transmission, thereby greatly reducing the abnormal noise problem during the driving of the car.
[0047] It is easy to understand that the lubricating medium can be any suitable existing lubricating oil, and the lubricating oil is a liquid medium, which can effectively reduce the amplitude of sound waves, reduce abnormal noise to a certain extent, and ensure NVH performance.
[0048] In one possible implementation, the transmission structure 3 includes a planetary gear shaft 301 and a planetary gear 302. The planetary gear shaft 301 is located in the installation groove, and its two ends are respectively inserted into the shell 1. Correspondingly, the shell 1 is provided with a clamping groove adapted to the planetary gear shaft 301, and two planetary gears 302 are provided and are relatively arranged on the planetary gear shaft 301.
[0049] Based on the above design, the planetary gear shaft 301 and the planetary gear 302 cooperate with each other to achieve torque distribution, so that the wheels can achieve differential operation. For the planetary gear shaft 301, both ends are plugged into the housing 1, and correspondingly, the housing 1 is provided with an adaptive snap-in groove, thereby replacing the pin connection in the existing design, on the one hand saving the production cost of the pin and reducing the pin press-fitting process, on the other hand avoiding the lubricating medium from flowing out of the pin, ensuring the sealing. For the planetary gear 302, any suitable existing model can be selected.
[0050] Optionally, both ends of the planetary gear shaft 301 are configured as squares, and correspondingly, the engaging grooves are configured as matching shapes so that the housing 1 and the planetary gear shaft 301 abut against each other. Based on the above design, the square has edges, and the abutment is achieved through the edges, which limits the relative rotation between the housing 1 and the planetary gear shaft 301, greatly reducing the probability of the planetary gear shaft 301 rotating. And the structure is simple and easy to install.
[0051] In a possible implementation, the transmission structure 3 includes two sets of bevel gear sets, one of which passes through the first mounting slot and is connected to the planetary gear 302, and the other passes through the second mounting slot and is connected to the planetary gear 302. Based on the above design, the transmission structure 3 transmits torque to the outside through the bevel gear set, and two sets are provided to respectively connect the wheels on both sides of the vehicle.
[0052] Optionally, the bevel gear set includes a half-shaft gear 303 and a gear end cover 304, the half-shaft gear 303 has two opposite ends, one end is configured as a connecting end inserted into the mounting groove and meshing with the planetary gear 302, and the other end is configured as a free end extending outward, and the gear end cover 304 is fixed to the connecting end of the half-shaft gear 303 by welding; accordingly, the sealing structure 4 is sleeved on the half-shaft gear 303.
[0053] Based on the above design, the side gear 303 is used to connect other components and transmit torque, and the gear end cover 304 is used to seal the side gear 303 to prevent the lubricating medium from flowing out from the spline direction of the side gear 303, thereby improving the sealing performance. At the same time, the side gear 303 extends outside the mounting groove, so there is an installation gap between it and the housing 1 and the main reduction gear 2. The installation gap is sealed by the sealing structure 4, further improving the sealing performance and reducing the possibility of lubricating medium leakage.
[0054] Alternatively, if Figure 2 As shown, a gasket 7 is provided in the installation groove, and the gasket 7 is located at the connection between the planetary gear 302 and the installation groove, and at the connection between the shaft shoulder of the half-shaft gear 303 and the installation groove. Based on this, the contact area is increased by the gasket 7, which can alleviate vibration impact and reduce abnormal noise on the one hand, and improve sealing and reduce leakage on the other hand. At the same time, the gasket 7 can also adjust the tightening force so that the transmission structure 3 can be better installed in the installation groove.
[0055] In a possible implementation, the sealing structure 4 is a sealing gasket, a sealing ring, a sealing ring or a sealing washer. It is easy to understand that the sealing structure 4 can also be any other suitable existing sealing parts, and the present invention does not impose any limitation on this.
[0056] In a possible implementation, a spiral groove 5 is provided at one end of the first mounting groove adjacent to the sealing structure 4 and at one end of the second mounting groove adjacent to the sealing structure 4. The spiral groove 5 is connected to the lubrication gap and is used to store the lubricating medium. Based on the above design, the lubricating medium is stored through the spiral groove 5, the storage amount of the lubricating medium in the mounting groove is increased, and the adjacent parts can also be lubricated, thereby reducing wear and prolonging the service life.
[0057] In a possible implementation, both the housing 1 and the main reduction gear 2 are made of low carbon steel or stainless steel, and the housing 1 is formed by forging. Based on the above design scheme, through forging, the housing 1 has good shape and size stability, high comprehensive mechanical properties, reasonable fiber structure of the forging, high toughness, and uniform and stable performance of the same batch of parts, which helps to improve the performance of the fully sealed welded differential assembly. At the same time, the housing 1 and the main reduction gear 2 are preferably made of the same material to make the welding more stable, ensure good sealing at the connection between the housing 1 and the main reduction gear 2, and reduce or even avoid leakage.
[0058] It is easy to understand that, in general, low-carbon steel is preferably used for the housing 1 and the main reduction gear 2. If the performance meets the requirements, stainless steel with lower cost can also be used.
[0059] In a possible implementation, the housing 1 is provided with an oil filling hole and a closing bolt 6 detachably arranged on the oil filling hole. Based on the design scheme, the injection, discharge, replenishment, and inspection of the lubricating medium can be realized through the oil filling hole, which can also help the staff to explore the situation in the installation groove, thereby improving the convenience of the staff's work. At the same time, the opening and closing of the oil filling hole is controlled by the closing bolt 6 to ensure that the lubricating medium will not leak from the oil filling hole, thereby ensuring the sealing of the fully sealed welded differential assembly; and the closing bolt 6 can select any suitable existing bolt, with a wide range of choices, and simple and easy operation.
[0060] In a possible implementation, the main reduction gear 2 includes a base shell 201 and a transmission tooth 202 , the base shell 201 is connected to the housing 1 , and accordingly, the second mounting groove is located on the base shell 201 , and the outer periphery of the base shell 201 is formed into a tooth shape by grinding, and the tooth shape is configured as the transmission tooth 202 .
[0061] Based on the above design, the base shell 201 can be constructed in any suitable shape, and similarly, the housing 1 can also be constructed in any suitable shape to adapt to different working occasions, which is practical. After the base shell 201 is connected to the housing 1, the transmission teeth 202 are processed, that is, the outer periphery of the base shell 201 is ground to form a tooth shape. Since the base shell 201 is connected to the housing 1 at this time, the assembly error between the two has less influence on the tooth shape, which helps to improve the tooth shape accuracy, thereby improving the NVH performance of the fully sealed welded differential assembly.
[0062] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A fully sealed welded differential assembly, characterized in that: include: The housing (1) has a first mounting groove with both ends connected to the outside; The main reduction gear (2) has a second mounting groove with both ends connected to the outside; and, a transmission structure (3); One end of the second mounting groove is sleeved on the housing (1) and connected by welding, so that the first mounting groove is connected to the second mounting groove and forms a mounting groove for mounting the transmission structure (3); accordingly, the transmission structure (3) is arranged on the mounting groove, and a lubrication gap for accommodating a lubricating medium is formed between the transmission structure (3) and the mounting groove, and both ends of the mounting groove are connected to the transmission structure (3) via a sealing structure (4).
2. The fully sealed welded differential assembly according to claim 1, characterized in that: The transmission structure (3) comprises a planetary gear shaft (301) and a planetary gear (302); the planetary gear shaft (301) is located in the installation groove, and its two ends are respectively plugged into the housing (1); accordingly, the housing (1) is provided with a clamping groove adapted to the planetary gear shaft (301), and two planetary gears (302) are provided and are arranged opposite to each other on the planetary gear shaft (301).
3. The fully sealed welded differential assembly according to claim 2, characterized in that: Both ends of the planetary gear shaft (301) are configured as squares, and correspondingly, the clamping groove is configured as an adaptive shape so that the housing (1) and the planetary gear shaft (301) abut against each other.
4. The fully sealed welded differential assembly according to claim 2, characterized in that: The transmission structure (3) comprises two sets of bevel gear sets, one of which passes through the first installation slot and is connected to the planetary gear (302), and the other passes through the second installation slot and is connected to the planetary gear (302).
5. The fully sealed welded differential assembly according to claim 4, characterized in that: The bevel gear set comprises a half-shaft gear (303) and a gear end cover (304); the half-shaft gear (303) has two opposite ends, one end of which is configured as a connecting end inserted into a mounting groove and meshing with a planetary gear (302), and the other end is configured as a free end extending outward; the gear end cover (304) is fixed to the connecting end of the half-shaft gear (303) by welding; accordingly, the sealing structure (4) is sleeved on the half-shaft gear (303).
6. The fully sealed welded differential assembly according to any one of claims 1 to 5, characterized in that: The sealing structure (4) is selected from sealing washers, sealing rings, sealing rings or sealing gaskets.
7. The fully sealed welded differential assembly according to claim 6, characterized in that: One end of the first installation groove adjacent to the sealing structure (4) and one end of the second installation groove adjacent to the sealing structure (4) are both provided with a spiral groove (5), and the spiral groove (5) is communicated with the lubrication gap and is used to store lubrication medium.
8. The fully sealed welded differential assembly according to claim 7, characterized in that: The housing (1) and the main reduction gear (2) are both made of low carbon steel or stainless steel, and the housing (1) is formed by forging.
9. The fully sealed welded differential assembly according to claim 8, characterized in that: The housing (1) is provided with an oil filling hole and a closing plug (6) detachably arranged on the oil filling hole.
10. The fully sealed welded differential assembly according to claim 8, characterized in that: The main reduction gear (2) comprises a base shell (201) and a transmission tooth (202); the base shell (201) is connected to the housing (1); accordingly, the second mounting groove is located on the base shell (201); the outer periphery of the base shell (201) is formed into a tooth shape by grinding, and the tooth shape is configured as the transmission tooth (202).