A rear reduction gearbox assembly

Abstract

The utility model discloses a rear reduction gearbox assembly belongs to the field of automobile parts, and the shell is formed by the main shell and the cover body buckle and forms the closed containing cavity, and the joint surface is equipped with sealing groove, positioning pin hole, realizes static seal and high-precision repeated assembly, and the main shell outside is equipped with annular mounting flange, and the inside is equipped with radiation or grid reinforcing rib and is connected first bearing seat, second bearing seat, improves rigidity, and input, middle, output three -gear assembly is supported by corresponding bearing respectively, and the bearing seat is the stepped hole structure, guarantees the coaxial degree, and the lubrication system includes the oil collecting cavity, the oil guide groove, the oil baffle and the oil seal, realizes the forced oil return and the dynamic seal, the top labyrinth ventilation, the bottom oil drain, the cover body oil filler makes the maintenance convenient, and the overall structure is compact, and the sealing is reliable, and the vibration is low, and the life is long, is suitable for vehicle and electric drive system.

Description

Technical Field

[0001] This utility model discloses an automotive component, and in particular relates to a rear gearbox assembly. Background Technology

[0002] Existing rear gearbox assemblies typically include a housing, input shaft and input gear, reduction gear set, output shaft and bearings, oil seals, and ventilation / lubrication / drainage structures. In existing technologies, controlling the coaxiality of the housing bearing housing and shaft bore is difficult, easily leading to uneven gear meshing, noise, and wear after assembly. When the lubricating oil is churned at high speed and the return path is unclear, insufficient oil supply to local bearings or meshing areas, or oil splashing, increases the risk of leakage at the sealing ends. The sealing structure at the housing mating surfaces is simple, leading to oil leakage after long-term use. The assembly and positioning of the cover and main housing are unreliable, and coaxiality decreases after repeated disassembly and reassembly. Utility Model Content

[0003] The purpose of this invention is to provide a rear gearbox assembly to solve the above-mentioned problems.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a rear gearbox assembly, characterized in that it includes a gearbox housing, an input component, a reduction gear assembly, an output component, and a lubrication and sealing component;

[0005] The gearbox housing is formed by the main shell and the cover being fastened together to form a closed accommodating cavity. The mating surfaces of the main shell and the cover are provided with a sealing groove and a sealing ring.

[0006] The input component includes an input shaft and an input gear disposed at the inner end of the input shaft. The input shaft passes through the first shaft hole of the gearbox housing and is supported and positioned by a first bearing.

[0007] The reduction gear assembly includes a driven gear that meshes with the input gear and an output gear that is fixed coaxially with the driven gear.

[0008] The output component includes an output shaft, which passes through a second shaft hole in the gearbox housing and is supported by a second bearing and a third bearing located on both sides of the output shaft.

[0009] The lubrication and sealing assembly includes oil seals disposed at the first shaft hole and the second shaft hole, and an oil collection chamber disposed at the bottom of the accommodating cavity. The inner wall of the gearbox housing forms an oil guide groove extending from the oil collection chamber to each bearing.

[0010] Preferably, a first bearing seat and a second bearing seat are integrally formed on the inner side of the main housing. Both the first bearing seat and the second bearing seat are annular stepped hole structures, which are used to limit the axial position of the first bearing and the second bearing, respectively.

[0011] Preferably, a third bearing seat is integrally formed on the inner side of the cover body. The third bearing seat is coaxially arranged with the second shaft hole, and the third bearing seat has an annular stepped hole structure to limit the third bearing.

[0012] Preferably, the driven gear is connected to the intermediate shaft via a spline, and the output gear and the intermediate shaft are integral or coaxially fixed structures; the two ends of the intermediate shaft are supported by a fourth bearing and a fifth bearing, respectively, and a corresponding intermediate shaft bearing seat is formed inside the gearbox housing.

[0013] Preferably, the inner wall of the gearbox housing is provided with an arc-shaped oil baffle in the meshing area of ​​the input gear and the driven gear. The oil baffle extends along the outer edge of the gear rotation to form an oil return guide surface.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] The circumferential continuous static seal and multi-bearing housing coaxial positioning prevent oil leakage and ensure reassembly accuracy. Radial reinforcing ribs connect the bearing housing and mounting flange into one unit, resulting in minimal housing deformation and low noise. The combination of oil collection chamber, oil guide groove, and oil baffle ribs allows lubricating oil to flow back quickly to each bearing, reducing oil churning losses and protecting the oil seal. The vent balances internal and external pressure, reducing oil mist leakage. The bottom drain port is directly opposite the lowest point of the oil collection chamber, allowing for complete drainage in one go. The filler port on the cover allows for oil replenishment without removing the cover. The mounting flange is a circumferential continuous flange, which can flexibly connect with the frame, rear axle housing, or electric drive system, accommodating various layouts. Attached Figure Description

[0016] Figure 1 This is an overall drawing of a rear gearbox assembly;

[0017] Figure 2 This is a cross-sectional view of a rear gearbox assembly;

[0018] Figure 3 This is a partial sectional view of a rear gearbox assembly;

[0019] Figure 4 This is a front view of a rear gearbox assembly.

[0020] Reference numerals: 1. Main housing; 12. Cover; 13. Output assembly; 14. Oil return guide surface; 15. Oil collection chamber; 16. Oil guide groove; 21. Input shaft; 23. Input gear; 41. Output shaft; 42. Output gear; 51. Oil seal; 131. Arc-shaped oil baffle. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the present utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0022] A rear gearbox assembly, such as Figures 1-4 As shown, the gearbox housing is formed by the main shell 1 and the cover 12 fastening together to form a closed accommodating cavity. A sealing groove is provided circumferentially on the mating surface of the main shell 1 and the cover 12, and a sealing ring is provided in the sealing groove to form a continuous circumferential static seal after fastening.

[0023] To ensure the accuracy of repeated assembly of the main shell 1 and the cover 12, a positioning structure is provided at the mating surface. The positioning structure includes at least two positioning pin holes and a positioning pin that mates with them. The positioning pin holes are arranged circumferentially along the mating surface, so that the cover 12 and the main shell 1 can be reliably positioned when they are fastened together, thereby improving the coaxiality of the shaft hole and the bearing seat.

[0024] A mounting flange is provided on the outer side of the main housing 1. The mounting flange is a circumferentially continuous annular flange structure with several mounting holes evenly distributed on it for installation and connection with the frame / rear axle housing or drive system. The main housing 1 has reinforcing ribs inside, which are distributed radially or in a grid pattern, connecting the first bearing housing, the second bearing housing and the mounting flange, thereby improving overall rigidity and reducing vibration.

[0025] The input assembly includes an input shaft 21 and an input gear 23 disposed at the inner end of the input shaft 21. The input shaft 21 passes through the first shaft hole of the main housing 1 and is supported and positioned by a first bearing. A first bearing seat is integrally formed on the inner side of the main housing 1. The first bearing seat has an annular stepped hole structure for axial limiting and coaxial positioning of the first bearing.

[0026] The reduction gear assembly includes a driven gear meshing with the input gear 23 and an output gear 42 coaxially fixed to the driven gear. In one embodiment, the driven gear is connected to an intermediate shaft via a spline, and the output gear 42 is integrally formed with or coaxially fixed to the intermediate shaft. The two ends of the intermediate shaft are supported by a fourth bearing and a fifth bearing, respectively, and corresponding intermediate shaft bearing seats are formed on the gearbox housing.

[0027] The output assembly 13 includes an output shaft 41, which passes through a second shaft hole in the gearbox housing. The output shaft 41 is supported by a second bearing and a third bearing located on both sides of the output shaft 41. A second bearing housing is integrally formed inside the main housing 1, and a third bearing housing is integrally formed inside the cover 12. Both the second and third bearing housings have annular stepped hole structures, which are used to axially limit the second and third bearings and ensure coaxiality.

[0028] The lubrication and sealing assembly includes oil seals 51 disposed at the first shaft hole and the second shaft hole to provide dynamic sealing for the input shaft 21 and the output shaft 41. An oil collecting chamber 15 is provided at the bottom of the accommodating cavity, and an oil guiding groove 16 is formed on the inner wall of the housing. The oil guiding groove 16 extends from the oil collecting chamber 15 to each bearing, so that the lubricating oil can be guided to the bearing area after falling back.

[0029] An arc-shaped oil baffle 131 is provided in the gear meshing area. The oil baffle extends along the outer edge of the gear rotation to form an oil return guide surface 14, which reduces the direct impact of oil on the oil seal 51 end and guides the oil return.

[0030] The top of the gearbox housing is equipped with a ventilation structure, including a vent hole and a labyrinth channel connected to the vent hole. The labyrinth channel is surrounded by zigzag ribs on the inner wall of the housing, which are used to reduce oil mist leakage and buffer pressure pulsation.

[0031] An oil drain port is provided at the bottom of the casing, forming an oil drain seat. The oil drain seat has an internal threaded hole and a drain plug fits in. The oil drain port is positioned to correspond to the lowest point of the oil collection chamber 15 to facilitate complete drainage. The cover 12 has an oil filler port, forming an oil filler seat. The oil filler seat has an internal threaded hole and a oil filler plug fits in.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rear gearbox assembly, characterized in that: It includes a gearbox housing, an input assembly, a reduction gear assembly, an output assembly (13), and a lubrication and sealing assembly; The gearbox housing is formed by fastening a main shell (1) and a cover (12) to form a closed accommodating cavity. The mating surfaces of the main shell (1) and the cover (12) are provided with sealing grooves and fitted with sealing rings. The input component includes an input shaft (21) and an input gear (23) disposed at the inner end of the input shaft (21). The input shaft (21) passes through the first shaft hole of the gearbox housing and is supported and positioned by the first bearing. The reduction gear assembly includes a driven gear that meshes with the input gear (23) and an output gear (42) that is fixed coaxially with the driven gear. The output assembly (13) includes an output shaft (41), which passes through the second shaft hole of the gearbox housing. The output shaft (41) is supported by a second bearing and a third bearing located on both sides of the output shaft (41). The lubrication and sealing assembly includes an oil seal (51) disposed at the first shaft hole and the second shaft hole, and an oil collection chamber (15) disposed at the bottom of the accommodating cavity. The inner wall of the gearbox housing forms an oil guide groove (16) extending from the oil collection chamber (15) to each bearing.

2. The rear gearbox assembly according to claim 1, characterized in that: The main shell (1) has an integrally formed first bearing seat and second bearing seat on its inner side. Both the first bearing seat and the second bearing seat are annular stepped hole structures, which are used to limit the axial position of the first bearing and the second bearing, respectively.

3. A rear gearbox assembly according to claim 2, characterized in that: The inner side of the cover (12) is integrally formed with a third bearing seat, which is coaxially arranged with the second shaft hole. The third bearing seat has an annular stepped hole structure to limit the third bearing.

4. A rear gearbox assembly according to claim 3, characterized in that: The driven gear is connected to the intermediate shaft via a spline, and the output gear (42) and the intermediate shaft are integral or coaxially fixed structures; the two ends of the intermediate shaft are supported by the fourth bearing and the fifth bearing respectively, and the corresponding intermediate shaft bearing seats are formed inside the gearbox housing.

5. A rear gearbox assembly according to claim 4, characterized in that: The inner wall of the gearbox housing is provided with an arc-shaped oil baffle (131) in the meshing area between the input gear (23) and the driven gear. The oil baffle extends along the outer edge of the gear rotation and is used to form an oil return guide surface (14).

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