An oil leakage-proof sealing assembly of a gear box

Abstract

This utility model relates to the field of gearbox sealing technology, specifically a gearbox oil leak-proof sealing assembly, including a gearbox body and an oil pan cover. A sealing flange plate is fixedly connected to the bottom opening of the gearbox body. The advantages of this utility model are: by tightening the locking bolts, the gearbox body and the oil pan cover are pressed together, causing the mating boss to embed into the sealing groove. Simultaneously, the sealing groove of the mating boss engages and presses against the conical protrusion of the sealing airbag ring, forming a reciprocating, tortuous sealing surface. This increases the cross-sectional length of the grease leakage path and the tortuosity of the path, making leakage more difficult. Furthermore, the tight fit between the sealing groove and the sealing airbag ring further improves the sealing effect. The pressing of the mating boss into the sealing groove compresses the sealing airbag ring, and the pressure at each point ensures that the conical protrusion is fully pressed against the inner wall of the sealing groove, increasing the compressive force on the sealing surface and thus improving the sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of gearbox sealing technology, and in particular to a gearbox oil-proof sealing assembly. Background Technology

[0002] In mechanical transmission systems, the gearbox is the core component for power transmission and speed conversion. The meshing of gears within the gearbox relies on lubricating oil for lubrication, cooling, and noise reduction; therefore, sealing components are crucial for preventing lubricating oil leakage. Seal failure leading to leakage not only causes lubricating oil loss and increased equipment maintenance costs, but can also cause gear wear, tooth surface scuffing, and even equipment downtime or safety accidents due to insufficient lubrication. Furthermore, leaked lubricating oil can pollute the surrounding environment. Currently, interface sealing is mainly achieved through sealing rings (such as O-rings or lip seals). However, traditional flat mating surface designs may still pose leakage risks under high pressure, vibration, or high temperature environments due to relatively straight sealing paths, insufficient compression settings, or material degradation, especially in older equipment or extreme operating conditions. Although current sealing technologies (such as low-friction composite materials or additive-based leak-proofing) have alleviated some problems, further design optimization is needed to reduce the leakage rate for dynamic sealing requirements and long-term durability. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a gearbox oil-proof sealing component, which effectively solves the deficiencies of the prior art.

[0004] To achieve the above objectives, one embodiment of this utility model provides an oil-leakage-proof sealing assembly for a gearbox, including a gearbox body and an oil pan cover. A sealing flange plate is fixedly connected to the bottom opening of the gearbox body. Locking bolts are threaded to the four corners of the sealing flange plate. A mating boss is fixedly connected to the inner side of the sealing flange plate. A sealing groove is formed on the top surface of the mating boss, and the sealing groove has a V-shaped cross-section. A sealing fitting groove is formed on the edge of the surface of the oil pan cover. The position of the sealing fitting groove corresponds to the position of the mating boss. The dimensions of the mating boss are... The dimensions of the inner wall of the sealing groove are adapted to each other. A sealing airbag ring is fixedly connected to the inner wall of the sealing groove. The sealing airbag ring includes a flat base part and a conical protrusion fixedly connected to the center of the top surface of the flat base part. The conical protrusion part and the flat base part together constitute the entire airbag. The position of the conical protrusion part corresponds to the position of the sealing groove. The positions of the two sides of the top surface of the flat base part that extend beyond the bottom two sides of the conical protrusion part correspond to the positions of the two sides of the mating boss. Threaded holes are opened at the four corners of the oil pan cover. The four locking bolts can be threaded into the four threaded holes respectively.

[0005] Preferably, in any of the above embodiments, the dimensions of the top surface of the oil pan cover are adapted to the dimensions of the bottom surface of the sealing flange plate, and a sealing ring is clamped between the edge of the top surface of the oil pan cover and the bottom surface of the sealing flange plate.

[0006] The technical effect achieved by adopting the above solution is that the sealing effect of the edge can be further improved by using the sealing ring.

[0007] Preferably, in any of the above embodiments, the thickness of the mating boss is greater than the distance from the top surface of the flat base to the top edge of the sealing groove, and the thickness of the mating boss is less than the depth of the inner wall of the sealing groove.

[0008] The technical effect achieved by adopting the above solution is that the mating boss can fully compress the sealing airbag ring, while preventing the thickness of the sealing airbag ring itself from affecting the mating boss from being fully pressed into the sealing groove.

[0009] Preferably, in any of the above embodiments, the width of the flat base portion is less than the width of the inner wall of the sealing groove, and the position of the top of the conical protrusion corresponds to the position of the top of the inner wall of the sealing groove.

[0010] The technical effect achieved by adopting the above solution is that the flat base can have open space on both sides, and the conical protrusion can be fully squeezed by the mating boss.

[0011] Preferably, in any of the above embodiments, the inner side of the mating boss corresponds to the side of the inner wall of the gearbox, and the position of the center of the conical protrusion corresponds to the position of the center of the inner wall of the sealing groove.

[0012] The technical effect achieved by adopting the above solution is that the conical protrusion can be squeezed and stretched evenly to both sides.

[0013] This utility model has the following advantages:

[0014] 1. The oil leakage prevention sealing assembly of this gearbox, when tightened with locking bolts, presses the gearbox body and oil pan cap together. The mating boss is embedded in the sealing groove, and the V-shaped sealing groove of the mating boss fits and presses against the conical protrusion of the sealing airbag ring, forming a tortuous sealing path. This extends the leakage cross-sectional length and increases flow resistance, reducing the risk of leakage. In practical applications, this design can effectively reduce the leakage rate, and the sealing effect is further enhanced by the fit between the sealing groove and the airbag ring. It is suitable for vibration or high-pressure environments.

[0015] 2. The oil leak prevention sealing assembly of this gearbox is pressed into the sealing groove by the mating boss, so that the sealing airbag ring is evenly squeezed and the conical protrusion is fully pressed against the inner wall of the sealing groove, which increases the contact pressure of the sealing surface and thus improves the overall sealing performance. At the same time, the flat base provides expansion space to avoid excessive deformation and supports compatibility with advanced lubricants (such as bio-based oils), reducing the need for long-term maintenance. 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 internal structure of the present invention;

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

[0019] Figure 4 This is a schematic diagram of the structure of the oil pan cover of this utility model.

[0020] In the diagram: 1-Gearbox housing, 2-Oil pan cap, 3-Sealing groove, 4-Sealing airbag ring, 41-Flat base, 42-Conical protrusion, 5-Threaded hole, 6-Sealing flange plate, 7-Locking bolt, 8-Mating boss, 9-Sealing groove. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0022] like Figures 1 to 4 As shown, an oil leak-proof sealing assembly for a gearbox includes a gearbox body 1 and an oil pan cap 2. A sealing flange plate 6 is fixedly connected to the bottom opening of the gearbox body 1. Locking bolts 7 are threaded to the four corners of the sealing flange plate 6. A mating boss 8 is fixedly connected to the inner side of the sealing flange plate 6. A sealing groove 9 is formed on the top surface of the mating boss 8. The sealing groove 9 has a V-shaped cross-section. A sealing fitting groove 3 is formed on the edge of the surface of the oil pan cap 2. The position of the sealing fitting groove 3 corresponds to the position of the mating boss 8. The size of the mating boss 8 is adapted to the size of the inner wall of the sealing fitting groove 3. A sealing airbag ring 4 is fixedly connected to the inner wall of the sealing groove 3. The sealing airbag ring 4 includes a flat base part 41 and a conical protrusion 42 fixedly connected to the center of the top surface of the flat base part 41. The conical protrusion 42 and the flat base part 41 together constitute the entire airbag. The position of the conical protrusion 42 corresponds to the position of the sealing groove 9. The positions of the two sides of the top surface of the flat base part 41 that extend beyond the bottom sides of the conical protrusion 42 correspond to the positions of the two sides of the mating boss 8. Threaded holes 5 are opened at the four corners of the oil pan cover 2. The four locking bolts 7 can be threadedly connected to the four threaded holes 5 respectively.

[0023] As an optional technical solution of this utility model, the size of the top surface of the oil pan cap 2 is adapted to the size of the bottom surface of the sealing flange plate 6, and a sealing ring is clamped between the edge of the top surface of the oil pan cap 2 and the bottom surface of the sealing flange plate 6. The sealing effect of the edge can be further improved by the sealing ring.

[0024] As an optional technical solution of this utility model, the thickness of the mating boss 8 is greater than the distance from the top surface of the flat base portion 41 to the top edge of the sealing groove 3, and the thickness of the mating boss 8 is less than the depth of the inner wall of the sealing groove 3, so that the mating boss 8 can fully compress the sealing airbag ring 4, while preventing the thickness of the sealing airbag ring 4 itself from affecting the mating boss 8 from being fully pressed into the sealing groove 3.

[0025] As an optional technical solution of this utility model, the width of the flat base portion 41 is smaller than the width of the inner wall of the sealing groove 3, and the position of the top of the conical protrusion 42 corresponds to the position of the top of the inner wall of the sealing groove 3, so that the flat base portion 41 has an open space on both sides, and the conical protrusion 42 can be fully squeezed by the mating boss 8.

[0026] As an optional technical solution of this utility model, the inner side of the mating boss 8 corresponds to the side of the inner wall of the gearbox housing 1, and the position of the center of the conical protrusion 42 corresponds to the position of the center of the inner wall of the sealing groove 3, so that the conical protrusion 42 can be evenly stretched to both sides when squeezed.

[0027] The oil leak-proof sealing assembly for this gearbox requires the following steps for use:

[0028] 1) Tighten the locking bolts 7 to press the gearbox housing 1 and the oil pan cover 2 together, so that the mating boss 8 is embedded in the sealing groove 3;

[0029] 2) At the same time, the sealing groove 9 of the mating boss 8 is fitted and pressed tightly with the conical protrusion 42 of the sealing airbag ring 4, forming a reciprocating tortuous sealing contact surface, increasing the cross-sectional length of grease leakage, and increasing the tortuosity of the path, thus increasing the difficulty of leakage.

[0030] 3) By pressing the sealing groove 9 against the sealing airbag ring 4, the sealing effect can be further improved.

[0031] In summary, by tightening the locking bolts 7, the gearbox housing 1 and the oil pan cap 2 are pressed together, causing the mating boss 8 to embed into the sealing groove 3. At the same time, the sealing groove 9 of the mating boss 8 is also fitted and pressed tightly with the conical protrusion 42 of the sealing airbag ring 4, forming a reciprocating and tortuous sealing contact surface. This increases the cross-sectional length of grease leakage and the tortuosity of the path, making leakage more difficult. Furthermore, the tight fit between the sealing groove 9 and the sealing airbag ring 4 further improves the sealing effect. By pressing the mating boss 8 into the sealing groove 3, the sealing airbag ring 4 is compressed. The pressure at each point ensures that the conical protrusion 42 is fully pressed against the inner wall of the sealing groove 9, increasing the compressive force on the sealing surface and thus improving the sealing performance.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A leak-proof sealing assembly for a gearbox, characterized in that: The gearbox includes a gearbox housing (1) and an oil pan cover (2). A sealing flange plate (6) is fixedly connected to the bottom opening of the gearbox housing (1). Locking bolts (7) are threaded to the four corners of the sealing flange plate (6). A mating boss (8) is fixedly connected to the inner side of the sealing flange plate (6). A sealing groove (9) is provided on the top surface of the mating boss (8). The sealing groove (9) has a V-shaped cross-section. A sealing fitting groove (3) is provided on the edge of the surface of the oil pan cover (2). The position of the sealing fitting groove (3) corresponds to the position of the mating boss (8). The size of the mating boss (8) is adapted to the size of the inner wall of the sealing fitting groove (3). The inner wall is fixedly connected with a sealing airbag ring (4). The sealing airbag ring (4) includes a flat base part (41) and a conical protrusion (42) fixedly connected to the center of the top surface of the flat base part (41). The conical protrusion (42) and the flat base part (41) together constitute the entire airbag. The position of the conical protrusion (42) corresponds to the position of the sealing groove (9). The positions of the two sides of the top surface of the flat base part (41) that extend beyond the bottom sides of the conical protrusion (42) correspond to the positions of the two sides of the mating boss (8). The oil cover (2) has threaded holes (5) at all four corners. The four locking bolts (7) can be threaded to the four threaded holes (5) respectively.

2. The oil-proof sealing assembly for a gearbox according to claim 1, characterized in that: The dimensions of the top surface of the oil pan cover (2) are adapted to the dimensions of the bottom surface of the sealing flange plate (6), and a sealing ring is clamped between the edge of the top surface of the oil pan cover (2) and the bottom surface of the sealing flange plate (6).

3. The oil-proof sealing assembly for a gearbox according to claim 2, characterized in that: The thickness of the mating boss (8) is greater than the distance from the top surface of the flat base portion (41) to the top edge of the sealing groove (3), and the thickness of the mating boss (8) is less than the depth of the inner wall of the sealing groove (3).

4. The oil-proof sealing assembly for a gearbox according to claim 3, characterized in that: The width of the flat base portion (41) is less than the width of the inner wall of the sealing groove (3), and the position of the top of the conical protrusion (42) corresponds to the position of the top of the inner wall of the sealing groove (3).

5. The oil-proof sealing assembly for a gearbox according to claim 4, characterized in that: The inner side of the docking boss (8) corresponds to the side of the inner wall of the gearbox housing (1), and the position of the center of the conical protrusion (42) corresponds to the position of the center of the inner wall of the sealing groove (3).

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