Shell of differential mechanism, differential mechanism and vehicle

Abstract

According to the differential mechanism shell, the differential mechanism and the vehicle, a gear limiting face of the differential mechanism shell is made of a material with high hardness, the abrasion resistance of the gear limiting face can be improved to a certain degree, the friction loss of the gear limiting face when the differential mechanism works is reduced, and the service life of the differential mechanism shell is prolonged. The abnormal sound of the differential mechanism is reduced, so that the driving comfort and the driving safety of the vehicle are improved; besides, the limiting body and the shell body are two independent parts and can be formed through different processes, the roughness of the gear limiting face formed by the limiting body can be improved as much as possible, a friction system is reduced, the friction force between the limiting body and the gear is further reduced, abrasion of the gear and the limiting body is further reduced, and abnormal sound is reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a differential housing, a differential, and a vehicle. Background Art

[0002] The differential is a crucial component of a vehicle's transmission system, allowing the wheels to rotate at different speeds during cornering, ensuring the vehicle can smoothly negotiate curves. The differential consists of a housing housing rotating components such as the axle gears and planetary gears. This rotation inevitably causes wear between the two surfaces within the differential that rotate relative to each other. Severe wear can cause an unusual noise during operation, which becomes more pronounced as vehicle speed increases. This noise not only affects driving comfort but can also, in severe cases, damage the differential's internal components, preventing the vehicle from properly operating.

[0003] Therefore, how to minimize the wear between two relatively rotating components inside a differential is one of the important issues that those skilled in the art are concerned about. Utility Model Content

[0004] The purpose of the present application is to provide a differential case that reduces the probability of abnormal noise. Another purpose of the present application is to provide a differential and a vehicle having the above differential case.

[0005] The present application provides a differential housing, comprising:

[0006] The shell body has an accommodating cavity, and at least one gear shaft mounting hole is provided on the cavity wall of the shell body surrounding the accommodating cavity;

[0007] A limiting body is fixed to the port area of ​​at least one gear shaft mounting hole facing the accommodating cavity, the limiting body has a gear limiting surface, and the hardness of the limiting body is greater than the hardness of the shell body.

[0008] In the implementation of this application, the gear limit surface of the differential housing is formed of a material with relatively high hardness, which can improve the wear resistance of the gear limit surface to a certain extent, reduce the friction loss of the gear limit surface when the differential is working, extend the service life of the differential housing, reduce the occurrence of abnormal noise of the differential, and thus improve the driving comfort and safety of the vehicle.

[0009] In addition, the limiter and the shell body are two independent components, which can be formed through different processes. The roughness of the gear limiter surface formed by the limiter can be improved as much as possible, reducing the friction system and further reducing the friction between the limiter and the gear, which is conducive to further reducing the wear of the gear and the limiter and reducing the occurrence of abnormal noise.

[0010] In one example, the limiting body is an annular washer, and the annular washer is coaxially arranged with the gear shaft mounting hole.

[0011] In one example, an end of the inner hole of the annular gasket away from the gear shaft mounting hole has a first tapered hole section, and the farther away from the gear shaft mounting hole, the larger the radial size of the first tapered hole section.

[0012] In one example, the end of the inner hole of the annular gasket adjacent to the gear shaft mounting hole has a second tapered hole section, and the closer to the gear shaft mounting hole, the larger the radial size of the second tapered hole section.

[0013] In one example, the inner hole of the annular gasket further includes a fitting hole segment, and the fitting hole segment is connected between the first tapered hole segment and the second tapered hole segment.

[0014] In one example, the inner surface of the cavity wall has a groove, and the limiting body is at least partially located inside the groove.

[0015] In one example, the material of the limiting body is steel.

[0016] In one example, the gear shaft mounting hole includes a half-shaft gear shaft mounting hole and a planetary gear shaft mounting hole, and the port areas of the half-shaft gear shaft mounting hole and the planetary gear shaft mounting hole are both fixed with the limiting body.

[0017] In addition, an embodiment of the present application also provides a differential, including a differential housing described in any one of the above items, two half-shaft gears and at least two planetary gears are arranged inside the accommodating cavity, the gear shaft mounting holes include two half-shaft gear shaft mounting holes and at least two planetary gear shaft mounting holes, the half-shaft gear shaft mounting holes correspond one-to-one to the half-shaft gears, the planetary gear shaft mounting holes correspond one-to-one to the planetary gears, and the gear limiting surface cooperates with the half-shaft gears or the planetary gears to limit.

[0018] In one example, a wear-resistant gasket is further included, and the half-shaft gear or the planetary gear is in contact with the limiting body through the wear-resistant gasket.

[0019] Furthermore, an embodiment of the present application also provides a vehicle, comprising a power component and the differential described above, wherein the power of the power component is transmitted to the wheels on both sides of the vehicle via the differential.

[0020] The differential and the vehicle in the embodiments of the present application have the above-mentioned differential housing, and therefore also have the above-mentioned technical effects of the differential housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of a differential in one embodiment of the present application;

[0022] Figure 2 This is a schematic structural diagram of a differential housing in one embodiment of the present application;

[0023] Figure 3 for Figure 1 A schematic diagram of a partial structure of the structure shown;

[0024] Figure 4 for Figure 3 A magnified schematic diagram of the structure shown.

[0025] in, Figures 1 to 4 The one-to-one correspondence between the reference numerals and component names is as follows:

[0026] 100 housing; 1 housing body; 11 accommodating cavity; 12 first planetary shaft mounting hole; 13 second planetary shaft mounting hole; 131 arcuate surface; 14 first side shaft gear shaft mounting hole; 15 second side shaft gear shaft mounting hole; 16 oil guide groove; 2 limiting body; 21 inner hole; 211 first tapered hole section; 212 matching hole section; 213 second tapered hole section;

[0027] 210 first side shaft gear; 220 second side shaft gear;

[0028] 310 first planetary gear; 320 second planetary gear; 330 gear shaft;

[0029] 400 wear-resistant gasket. DETAILED DESCRIPTION

[0030] In response to the technical problem mentioned in the background art that the differential will wear out after long-term operation, causing abnormal noise and affecting the normal driving of the vehicle, the inventors of this application have conducted extensive research and found that: the inner wall of the current differential housing is provided with a gear limiting surface to limit the installation position of the gear and prevent the gear from moving. When the differential is working, the gears rotate relative to the gear limiting surface, and the two will inevitably come into contact and rub. Because the housing material of the differential is cast iron, which has a relatively low hardness, the gear limiting surface will be rubbed for a long time and will be worn. After the gear limiting surface is worn, the distance between it and the gear is too large, and abnormal noise will be generated when the differential is working.

[0031] Based on the above findings, the present application proposes a technical solution that can alleviate the wear of the gear limiting surface inside the differential housing, thereby reducing the occurrence of abnormal noise during operation of the differential.

[0032] Please refer to Figures 1 to 4 , Figure 1 This is a structural diagram of a differential in one embodiment of the present application; Figure 2 This is a schematic structural diagram of a differential housing in one embodiment of the present application; Figure 3 for Figure 1A schematic diagram of a partial structure of the structure shown; Figure 4 for Figure 3 A magnified schematic diagram of the structure shown.

[0033] An embodiment of the present application provides a vehicle comprising a vehicle body, on which are mounted components such as a power unit and a differential. The power unit may be an engine, a power battery, or other components capable of providing power. Power from the power unit is transmitted to the differential via a power output shaft, and then to the wheels via the differential. For front-wheel drive vehicles, the differential may be mounted on the transmission; for rear-wheel drive vehicles, the differential may be mounted in the rear axle differential case. The mounting location of the differential, of course, depends on the vehicle and is not limited to the two mounting locations described above.

[0034] In the embodiment of the present application, the differential includes at least a housing 100, planetary gears, and side gears. There are two side gears. To clearly and concisely describe the technical solution, the embodiment of the present application defines the two side gears as a first side gear 210 and a second side gear 220, respectively, which are also commonly referred to as the left side gear and the right side gear. The central axes of the two side gears can be coaxial. The figures of the present application show two planetary gears, respectively defined as a first planetary gear 310 and a second planetary gear 320. The two planetary gears can be bevel gears, and the first planetary gear 310 and the second planetary gear 320 are respectively mounted on the opposite ends of the gear shaft 330. Of course, the number of planetary gears is not limited to the two described in this application, and can also be four or six, etc. This application uses the example of two planetary gears to continue to describe the technical solution and technical effects.

[0035] The first and second planetary gears 310 and 320 are mounted on the housing 100 via gear shafts. Both of them mesh with the first and second side gears 210 and 220. Specifically, the first and second planetary gears 310 and 320 mesh between the first and second side gears 210 and 220. Power from the power unit is transmitted through the first and second planetary gears 310 and 320 and then output from the first and second side gears 210 and 220, respectively. Specifically, the first side gear 210 is coupled to a first gear shaft (not shown), while the second side gear 220 is coupled to a second gear shaft (not shown). The other end of the first gear shaft is connected to a wheel on one side of the vehicle, while the other end of the second gear shaft is connected to a wheel on the other side of the vehicle.

[0036] In the embodiment of the present application, the differential housing 100 includes a housing body 1, which is typically a casting, i.e., the housing body 1 is made of cast iron. The housing body 1 defines a housing cavity 11, within which components such as the planetary gears and side gears are mounted. To facilitate installation of components within the housing cavity 11, the housing body 1 typically comprises two halves, which are joined and fixed together to form the housing cavity 11. The two halves can be fixedly connected using bolts, flanges, or other fasteners, facilitating disassembly and maintenance.

[0037] In this embodiment of the present application, at least one gear shaft mounting hole is provided on the wall of the housing body 1 that encloses the accommodating cavity 11, for passage of a corresponding gear shaft. Specifically, the housing body 1 is provided with two sideshaft gear shaft mounting holes and two planetary gear shaft mounting holes, each for passage of a gear shaft connected to the sideshaft gears. The planetary gear shaft mounting holes correspond one to one with the planetary gears and are used to mount the gear shafts that pass through the planetary gears. The housing body 1 is provided with a first sideshaft gear shaft mounting hole 14 and a second sideshaft gear shaft mounting hole 15. The first gear shaft connected to the first sideshaft gear 210 is disposed within the first sideshaft gear shaft mounting hole 14, and the second gear shaft connected to the second sideshaft gear 220 is disposed within the second sideshaft gear shaft mounting hole 15. The housing body 1 is provided with a first planetary shaft mounting hole 12 and a second planetary shaft mounting hole 13. The ends of the gear shaft 330 are respectively mounted within the first planetary shaft mounting hole 12 and the second planetary shaft mounting hole 13.

[0038] In the embodiment of the present application, the shell 100 further includes a limiting body 2, and at least one gear shaft mounting hole is fixed with the limiting body 2 in the port area facing the accommodating cavity 11. The limiting body 2 is configured to form a gear limiting surface, that is, the gear limiting surface on the shell 100 is formed on the limiting body 2, and the limiting body 2 cooperates with the corresponding gear for limiting. At least one of the half-shaft gear shaft mounting hole and the planetary gear shaft mounting hole is provided with a limiting body 2. When the limiting body 2 is provided in the port area of ​​the half-shaft gear shaft mounting hole, the gear limiting surface on the limiting body 2 cooperates with the half-shaft gear for limiting. When the limiting body 2 is provided in the port area of ​​the planetary gear shaft mounting hole, the gear limiting surface on the limiting body 2 cooperates with the planetary gear shaft for limiting. In the embodiment of the present application, the hardness of the limiting body 2 is greater than the hardness of the shell body 1. The limiting body 2 can be pre-processed and then formed into one piece with the shell body 1 through a casting process. Of course, the limiting body 2 and the shell body 1 can also be fixed together through a welding process.

[0039] In the implementation of this application, the gear limiting surface of the differential housing 100 is formed of a material with relatively high hardness, which can improve the wear resistance of the gear limiting surface to a certain extent, reduce the friction loss of the gear limiting surface when the differential is working, extend the service life of the differential housing 100, reduce the occurrence of abnormal noise of the differential, and thus improve the driving comfort and driving safety of the vehicle.

[0040] In addition, the limiter 2 and the shell body 1 are two independent components, which can be formed through different processes. The roughness of the gear limiter surface formed by the limiter 2 can be improved as much as possible, reducing the friction system and further reducing the friction between the limiter 2 and the gear, which is conducive to further reducing the wear of the gear and the limiter 2 and reducing the occurrence of abnormal noise.

[0041] In the embodiment of the present application, the limiting body 2 can be an annular washer, which can form a circumferential gear limiting surface to reduce the probability of the gear contacting the shell body 1. In this way, the gear only has friction contact with the gear limiting surface, further effectively reducing the occurrence of abnormal noise in the differential. The annular washer is coaxially arranged with the gear mounting hole at its installation position. The shape of the annular washer can be determined according to the shape of the shell body 1 at its installation position. For example, the limiting body 2 installed at the half-shaft gear mounting hole position in the figure is in the form of a flat washer, while the limiting body 2 installed at the planetary gear mounting hole position is in the form of an arc surface, such as Figure 2 The inner end area of ​​the planetary gear mounting hole is an arc surface 131, and the gear limiting surface formed by the limiting body is also roughly an arc surface. The limiting body can be a washer with an arc structure. In this embodiment, the annular washer molding process is simple.

[0042] In the embodiment of the present application, the inner hole 21 of the annular washer is a non-uniform hole along the axial direction, divided into at least two sections. In one example, the end of the inner hole 21 of the annular washer away from the gear shaft mounting hole has a first tapered hole section 211, with the radial dimension of the first tapered hole section 211 increasing with distance from the gear shaft mounting hole. For example, in the annular washer positioned near the axle gear shaft mounting hole, the left end of the inner hole of the limiting body 2 is clearly shown in the figure. This reduces edge contact between the limiting body 2 and the axle gear or washer to its left, resulting in reduced wear and improved NVH (Noise Vibration Harshness) performance.

[0043] In the embodiment of the present application, the end of the inner hole 21 of the annular gasket adjacent to the gear shaft mounting hole has a second conical hole section 213. The closer to the gear shaft mounting hole, the larger the radial dimension of the second conical hole section 213. This can avoid abnormal wear between the inner hole 21 of the annular gasket and the gear shaft neck, and further reduce the probability of abnormal noise.

[0044] Likewise, the structure of the annular washer disposed at the mounting hole of the planetary gear shaft is similar to this.

[0045] In an embodiment of the present application, the inner hole 21 of the annular gasket also includes a mating hole section 212, which is connected between the first conical hole section 211 and the second conical hole section 213. The mating hole section 212 is clearance-fitted with the gear shaft section passing through its interior, thereby playing a positioning role in the gear installation.

[0046] In the embodiment of the present application, the inner surface of the cavity wall of the differential housing 100 has a groove, and the limiting body 2 is at least partially located within the groove. The limiting body 2 can also be located completely within the groove. For example, the gear limiting surface is located exactly at the notch position of the groove, or slightly extends out of the notch by a predetermined distance. Of course, if the gear limiting surface and the gear are matched, the limiting body 2 can also be located completely within the groove. This can reduce the space occupied by the limiting body 2 in the differential accommodating cavity 11 and does not affect the layout of the various gears.

[0047] The material of the limiter 2 in the above embodiments can be steel, which has high hardness, simple processing technology and relatively low cost. The limiter 2 can be formed from steel by stamping, milling or other processes, wherein steel has high hardness when stamped.

[0048] In this embodiment of the present application, the end areas of both the axle gear shaft mounting holes and the planetary gear shaft mounting holes can be fixed with a limiter 2 to minimize the occurrence of abnormal noise. The specific shape of each limiter 2 is not specifically limited herein, as long as it can form a gear limiter surface that cooperates with the corresponding gear to limit the position.

[0049] In addition, an oil guide groove 16 can be provided on the inner wall of the gear mounting hole, and external lubricating oil can flow into the oil guide groove 16, which can not only lubricate the gear shaft inside the gear mounting hole, but also flow along the oil guide groove 16 to the inside of the housing 100 to lubricate the gears and other components inside the housing 100, further reducing the wear of the various rotating parts of the differential.

[0050] In order to minimize the wear between the gear and the limiter 2, a wear-resistant gasket 400 can be set between the gear and the limiter 2. The wear-resistant gasket 400 contacts the limiter 2 to further reduce the friction between the two and reduce the probability of abnormal noise.

[0051] The differential and vehicle provided in the embodiments of the present application include the differential housing 100 described above, and therefore also have the above-mentioned technical effects of the differential housing 100 .

[0052] For other structures of the vehicle and differential, please refer to the current technology, which will not be elaborated in this application.

[0053] In the description of the embodiments of the present application, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0054] In the embodiments of this application, "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0055] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core ideas of this application. It should be noted that for those skilled in the art, without departing from the principles of this application, various improvements and modifications can be made to this application, and such improvements and modifications also fall within the scope of protection of the claims of this application.

Claims

1. A differential housing, characterized in that: include: A shell body (1) having an accommodating cavity (11), wherein at least one gear shaft mounting hole is provided on a cavity wall of the shell body (1) surrounding the accommodating cavity (11); A limiting body (2) is fixed to a port area of ​​at least one of the gear shaft mounting holes facing the accommodating cavity (11), the limiting body having a gear limiting surface, and the hardness of the limiting body (2) is greater than the hardness of the shell body (1).

2. The differential housing according to claim 1, characterized in that: The limiting body (2) is an annular washer, and the annular washer is coaxially arranged with the gear shaft mounting hole.

3. The differential housing according to claim 2, characterized in that: An end of the inner hole (21) of the annular washer away from the gear shaft mounting hole has a first tapered hole section (211), and the farther away from the gear shaft mounting hole, the larger the radial dimension of the first tapered hole section (211).

4. The differential housing according to claim 3, characterized in that: The end portion of the inner hole (21) of the annular gasket adjacent to the gear shaft mounting hole has a second tapered hole section (213), and the closer to the gear shaft mounting hole, the larger the radial dimension of the second tapered hole section (213).

5. The differential housing according to claim 4, characterized in that: The inner hole of the annular gasket further comprises a matching hole section (212), and the matching hole section (212) is connected between the first tapered hole section (211) and the second tapered hole section (213).

6. The differential housing according to any one of claims 1 to 5, characterized in that: The inner surface of the cavity wall has a groove, and the limiting body (2) is at least partially located inside the groove; Alternatively or alternatively, the material of the limiting body (2) is steel.

7. The differential housing according to any one of claims 1 to 5, characterized in that: The gear shaft mounting holes comprise a half-shaft gear shaft mounting hole and a planetary gear shaft mounting hole, and the limiting bodies (2) are fixed to the port areas of the half-shaft gear shaft mounting holes and the planetary gear shaft mounting holes.

8. A differential, characterized in that: A housing (100) comprising a differential according to any one of claims 1 to 7, wherein two half-shaft gears and at least two planetary gears are provided inside the accommodating cavity (11), the gear shaft mounting holes comprise two half-shaft gear shaft mounting holes and at least two planetary gear shaft mounting holes, the half-shaft gear shaft mounting holes correspond one-to-one to the half-shaft gears, the planetary gear shaft mounting holes correspond one-to-one to the planetary gears, and the gear limiting surface cooperates with the half-shaft gears or the planetary gears to limit the position.

9. The differential according to claim 8, characterized in that It also includes a wear-resistant gasket (400), and the half-shaft gear or the planetary gear contacts the limiting body (2) through the wear-resistant gasket.

10. A vehicle, characterized in that: The vehicle comprises a power component and the differential according to claim 8 or 9, wherein the power of the power component is transmitted to the wheels on both sides of the vehicle via the differential.

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