A precise aluminum die-cast automobile transmission housing structure

Abstract

The utility model discloses a kind of precision aluminum die-casting automobile transmission shell structure, including mutually buckled lower shell and upper shell, the connecting end of the lower shell and the upper shell is equipped with lower shell sealing surface and upper shell sealing surface respectively, a annular rib is integrally die-casting on the lower shell sealing surface, annular groove for accommodating the annular rib is equipped with in corresponding position on the upper shell sealing surface, the radial inner side and radial outer side of the annular rib are inlaid with first sealing ring, the second sealing ring is inlaid on the sealing plane of the notch two sides of the annular groove, the inside of the lower shell sealing surface and the upper shell sealing surface is equipped with cooling liquid flow channel, the outside of each cooling liquid flow channel is connected with liquid inlet and liquid outlet. The utility model integrates cooling liquid flow channel in the inside of shell sealing surface, heat at sealing surface is actively taken away by circulating cooling liquid, to slow down the problem that sealing ring is aged, failure due to long-term high temperature overheating.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts processing technology, and in particular to a precision aluminum die-cast automotive transmission housing structure. Background Technology

[0002] With the continuous development of the automotive industry, higher requirements have been placed on the performance and reliability of transmissions. Precision die casting technology for aluminum alloys has become the mainstream process for manufacturing automotive transmission housings due to its ability to form complex shapes and achieve lightweight construction. Currently, transmission housings are mainly composed of upper and lower halves connected by bolts, and the sealing performance of this connection directly affects whether internal lubricating oil leaks.

[0003] Currently, traditional housing sealing methods mainly rely on placing rubber or silicone gaskets or O-rings between the machined flat sealing surfaces. When the transmission operates in a high-temperature environment for a long time, this single elastic seal is prone to aging, hardening, or even embrittlement, leading to a decrease in sealing pressure and a sharp decline in sealing performance, which in turn causes leakage.

[0004] To address these issues, we propose a precision aluminum die-cast automotive transmission housing structure. Utility Model Content

[0005] The purpose of this invention is to provide a precision aluminum die-cast automotive transmission housing structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A precision aluminum die-cast automotive transmission housing structure includes a lower housing and an upper housing that interlock. The connecting ends of the lower housing and the upper housing are respectively provided with a lower housing sealing surface and an upper housing sealing surface. An annular rib is integrally die-cast on the lower housing sealing surface. An annular groove for accommodating the annular rib is provided at a corresponding position on the upper housing sealing surface. A first sealing ring is embedded on both the radially inner and radially outer sides of the annular rib. A second sealing ring is embedded on both sealing planes on both sides of the groove opening of the annular groove. Coolant channels are provided inside the sealing surfaces of the lower housing and the upper housing. An inlet and an outlet are connected to the outer side of each coolant channel.

[0008] In a further embodiment, the cross-sections of the annular rib and the annular groove are trapezoidal.

[0009] In a further embodiment, the width of the annular groove is greater than the width of the annular rib, forming a radial gap of 0.1-0.3 mm between them.

[0010] In a further embodiment, the top of the cross-section of the annular rib is arc-shaped, forming a line contact with the bottom of the annular groove.

[0011] In a further embodiment, both the first sealing ring and the second sealing ring have an annular sealing groove at their mounting locations, and the sealing groove is filled with sealant.

[0012] In a further embodiment, the outer edges of both the lower housing sealing surface and the upper housing sealing surface are integrally cast with a plurality of radially distributed connecting lugs.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention integrates a coolant flow channel inside the sealing surface of the housing. By circulating coolant, the heat at the sealing surface is actively carried away, which can effectively reduce the temperature of the sealing surface and the local environment where the sealing ring is located. This slows down the aging and failure of the sealing ring due to long-term high temperature overheating, and improves the service life and reliability of the sealing component.

[0015] This invention employs a combination of annular ribs and annular grooves to form the first mechanical defense line. The first sealing rings embedded on both sides of the ribs and the second sealing rings embedded in the groove openings form a total of four independent elastic sealing lines on both the inner and outer sides. The multiple sealing structures constitute a long leakage path, resulting in better sealing and a higher fault tolerance rate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the lower shell structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the upper shell structure of this utility model;

[0019] Figure 4 This is a partial cross-sectional structural diagram of the sealing surface of the lower housing and the sealing surface of the upper housing during assembly.

[0020] In the diagram: 1. Lower housing; 2. Upper housing; 3. Lower housing sealing surface; 31. Annular rib; 4. Upper housing sealing surface; 41. Annular groove; 5. First sealing ring; 6. Second sealing ring; 7. Coolant flow channel; 8. Inlet; 9. Outlet; 10. Sealing groove; 11. Sealing adhesive; 12. Connecting lug. Detailed Implementation

[0021] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "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 this utility model and simplifying the description, and 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, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-4 A precision aluminum die-cast automotive transmission housing structure, mainly composed of a lower housing 1 and an upper housing 2 that are interlocked with each other, wherein the connecting ends of the lower housing 1 and the upper housing 2 are respectively machined with a lower housing sealing surface 3 and an upper housing sealing surface 4.

[0025] An annular rib 31 with a trapezoidal cross-section is integrally formed on the sealing surface 3 of the lower housing by precision die casting. Correspondingly, an annular groove 41 for accommodating the annular rib 31 is die-cast on the sealing surface 4 of the upper housing. To ensure smooth assembly and adapt to thermal expansion and contraction, the width of the annular groove 41 is slightly larger than the width of the annular rib 31, forming a radial gap of 0.1-0.3mm between them. As a preferred option, the top of the annular rib 31 can be designed as an arc shape so as to form a main sealing line with higher pressure when in contact with the bottom of the annular groove 41.

[0026] To achieve multiple seals, annular sealing grooves 10 are provided on both the radial inner and radial outer sides of the annular rib 31, and oil-resistant and high-temperature resistant first sealing rings 5, such as fluororubber or hydrogenated nitrile rubber rings, are inlaid therein. At the same time, second sealing rings 6 of the same material are also inlaid on the sealing planes on both sides of the groove opening of the annular groove 41. To fix these sealing rings and enhance the sealing effect, high-performance sealant 11 can be further filled into the annular sealing groove 10.

[0027] To address the issue of high-temperature failure, coolant channels 7 are machined into the interior of both the lower housing sealing surface 3 and the upper housing sealing surface 4. Each coolant channel 7 is connected to an inlet 8 and an outlet 9 extending from the outer wall of the housing, allowing connection to an external cooling system for active heat dissipation. Furthermore, several radially evenly distributed connecting lugs 12 are integrally cast along the outer edges of the lower housing sealing surface 3 and the upper housing sealing surface 4, used to tightly connect the upper and lower housings with bolts.

[0028] During assembly, the first sealing ring 5 and the second sealing ring 6 are respectively embedded into the corresponding annular sealing grooves 10, and an appropriate amount of sealant 11 can be applied to the grooves. Then, the upper housing 2 and the lower housing 1 are aligned and fastened together. At this time, the annular rib 31 is embedded into the annular groove 41, and multiple sealing rings are compressed to form multiple sealing lines. Finally, the bolts are tightened through the bolt holes on the connecting lug 12. When the transmission is working, the coolant flows into the coolant channel 7 through the inlet 8, carries away the heat, and flows out from the outlet 9, thereby ensuring that the sealing system is always within a suitable operating temperature range.

[0029] 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.

[0030] 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 precision aluminum die-cast automotive transmission housing structure, comprising a lower housing (1) and an upper housing (2) that interlock, characterized in that: The lower housing (1) and the upper housing (2) are respectively provided with a lower housing sealing surface (3) and an upper housing sealing surface (4). An annular rib (31) is integrally die-cast on the lower housing sealing surface (3). An annular groove (41) for accommodating the annular rib (31) is provided at the corresponding position on the upper housing sealing surface (4). A first sealing ring (5) is embedded on both the radial inner side and the radial outer side of the annular rib (31). A second sealing ring (6) is embedded on both sides of the sealing plane of the groove opening of the annular groove (41). Coolant channels (7) are provided inside the lower housing sealing surface (3) and the upper housing sealing surface (4). An inlet (8) and an outlet (9) are connected to the outer side of each coolant channel (7).

2. The precision aluminum die-cast automotive transmission housing structure according to claim 1, characterized in that: The cross-sections of the annular rib (31) and the annular groove (41) are trapezoidal.

3. The precision aluminum die-cast automotive transmission housing structure according to claim 1, characterized in that: The width of the annular groove (41) is greater than the width of the annular rib (31), and a radial gap of 0.1-0.3 mm is formed between them.

4. The precision aluminum die-cast automotive transmission housing structure according to claim 1, characterized in that: The top of the cross-section of the annular rib (31) is arc-shaped, forming a line contact with the bottom of the annular groove (41).

5. The precision aluminum die-cast automotive transmission housing structure according to claim 1, characterized in that: Both the first sealing ring (5) and the second sealing ring (6) have annular sealing grooves (10) at their mounting locations, and the sealing grooves (10) are filled with sealant (11).

6. The precision aluminum die-cast automotive transmission housing structure according to claim 1, characterized in that: The outer edges of the lower housing sealing surface (3) and the upper housing sealing surface (4) are integrally cast with a plurality of radially distributed connecting ears (12).

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