Gearbox ventilation structure capable of reducing water inflow probability

Abstract

The utility model relates to a gearbox ventilation structure capable of reducing water inflow probability, which belongs to the technical field of gearbox ventilation and comprises a gearbox body, a ventilation port is arranged on the gearbox body, a ventilation pipe is arranged in the ventilation port, and one end of the ventilation pipe far away from the gearbox body is communicated with a pipeline I and a pipeline II which extend downwards. The pipeline I and the pipeline II extend downwards, so that external impurities can be directly prevented from entering the pipeline; most importantly, the first pipeline and the second pipeline can increase the number of channels for external air to enter the gearbox body, and then the probability that external water enters the gearbox body is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of gearbox ventilation, in particular to a gearbox ventilation structure capable of reducing the probability of water ingress. Background Art

[0002] The main function of the commercial vehicle gearbox is to amplify the torque provided by the engine by more than ten times and drive the entire vehicle through the axle. With the long-term operation of the gearbox, its operating temperature will increase by about 100°C on the basis of the ambient temperature, so that the entire system will reach a stable operating temperature again. At this point, although the gearbox continues to work, its operating temperature will not increase again. When the vehicle stops, as the parking time goes by, the gearbox will also exchange heat with the surrounding environment until the temperature is balanced. According to the relevant thermodynamic formula, when the operating temperature of the gearbox increases by 100°C, its original air volume will increase by 1.3 to 1.4 times, so it is necessary to add a ventilation device to the gearbox to ensure that the air pressure inside the gearbox is equal to or similar to the air pressure of the external working environment. Otherwise, the huge pressure difference between the inside and outside of the gearbox will cause the failure of its sealing measures, resulting in serious faults such as oil leakage.

[0003] The breather plug can ensure that the air in the gearbox is directly connected to the surrounding environment, but in some special cases, such as when the environment is extremely humid, or a large amount of water is suddenly poured on the gearbox breather plug, etc., water vapor or water flow will enter the gearbox, especially when the gearbox temperature drops and the internal air volume shrinks. When the water content in the gearbox reaches a certain proportion (3% to 7%), the lubricating oil in the gearbox will emulsify and become ineffective. It is necessary to ensure that the internal and external air pressures of the gearbox are stable when the gearbox is working, and to ensure that in some identifiable special cases, water vapor and water flow in the air will not enter the gearbox. The conventional breather plug installed on the original gearbox cannot avoid this risk. Utility Model Content

[0004] In order to solve the problem that the vent plug cannot ensure the stability of the internal and external air pressure of the gearbox and at the same time form a barrier to the external liquid, the utility model provides a gearbox ventilation structure that reduces the probability of water ingress.

[0005] The utility model is realized by the following technical solutions:

[0006] A gearbox ventilation structure for reducing the probability of water ingress comprises a gearbox body, a vent opening is provided on the gearbox body, a vent pipe is provided in the vent opening, and one end of the vent pipe away from the gearbox body is connected to a pipe 1 and a pipe 2 extending downward. Both pipe 1 and pipe 2 extend downward, which can directly prevent external impurities from entering the pipe; most importantly, pipe 1 and pipe 2 can increase the passage for external air to enter the gearbox body, thereby reducing the probability of external water entering the gearbox body.

[0007] A further improvement of the utility model is that the above-mentioned pipeline 1 and pipeline 2 are arranged on both sides of the gearbox body. Being arranged on both sides of the gearbox body reduces the probability of pipeline 1 and pipeline 2 encountering a large external water flow at the same time, thereby greatly reducing the probability of water flow being reversely sucked into the gearbox body; and because the quality of water flow and air is different, in this case, assuming that the water flow at the opening of pipeline 1 is large, the water flow at this point will not be pressed into the gearbox, but the air on the opening side of pipeline 2 will flow back into the gearbox body to achieve the balance of the internal and external pressure difference, thereby avoiding water flowing into the gearbox body to cause the lubricating oil to fail, and vice versa.

[0008] A further improvement of the utility model is that the ends of the pipe 1 and the pipe 2 away from the vent pipe are both provided with bell mouths, which helps to increase the reverse suction force when the water flows back, thereby reducing the probability of the water flowing back into the gearbox through the pipe.

[0009] A further improvement of the utility model is that the bell mouth is provided with a fixing clip which can fix it on the gearbox body. The bell mouth can be fixed by the fixing clip.

[0010] A further improvement of the utility model is that the above-mentioned pipeline 1 and pipeline 2 are provided with an L-shaped bending structure, which helps to increase the difficulty of water vapor entering the gearbox body along the pipeline.

[0011] A further improvement of the utility model is that the ventilation pipe is connected with pipeline 1 and pipeline 2 through the cavity shell. The cavity shell can realize the connection between the three sections of pipelines.

[0012] A further improvement of the utility model is that the cavity shell is filled with a desiccant, which helps to dry the water vapor in the pipeline and prevent the water vapor from entering the gearbox body, causing the lubricant to emulsify or the parts to rust.

[0013] A further improvement of the utility model is that a non-woven bag is provided in the cavity shell, and the desiccant is packed in the non-woven bag to prevent the desiccant from flowing along the pipeline.

[0014] A further improvement of the utility model is that the cavity housing is provided with an assembly bayonet which can be buckled thereon to realize the replacement of the desiccant, so that the desiccant can be replaced in time.

[0015] A further improvement of the utility model is that the ventilation pipe is a Z-shaped bending structure as a whole, and the cavity shell is arranged at the lower end of the ventilation pipe, which helps to increase the difficulty of water vapor or desiccant leaking into the gearbox body along the pipeline.

[0016] It can be seen from the above technical scheme that the beneficial effects of the utility model are: both pipeline one and pipeline two extend downward, which can directly prevent external impurities from entering the pipe; the most important thing is that pipeline one and pipeline two can increase the channel for external air to enter the gearbox body, thereby reducing the probability of external water entering the gearbox body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the utility model, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of a specific implementation method of the utility model.

[0019] Figure 2 It is a schematic diagram of the assembly of the ventilation pipe, pipeline 1 and pipeline 2 according to a specific implementation manner of the utility model.

[0020] Figure 3 It is a cross-sectional schematic diagram of a specific implementation mode of the utility model taking a ventilation pipe and a pipeline 1 as an example.

[0021] In the accompanying drawings: 10, gearbox body, 11, vent, 20, vent pipe, 30, cavity shell, 31, assembly bayonet, 32, desiccant, 40, pipeline one, 50, pipeline two, 60, bell mouth, 61, fixing clip. DETAILED DESCRIPTION

[0022] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme of the utility model will be clearly and completely described below in combination with the drawings in the specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0023] As attached Figure 1-3As shown, a gearbox ventilation structure for reducing the probability of water ingress includes a gearbox body 10, a vent 11 is provided on the gearbox body 10, a vent pipe 20 is provided in the vent 11, the vent pipe 20 is in a Z-shaped bending structure as a whole, and the lower end of the vent pipe 20 is connected to a cavity shell 30; the cavity shell 30 is filled with a desiccant 32. It helps to dry the water vapor in the pipeline to prevent the water vapor from entering the gearbox body 10, causing the emulsification of the lubricating fluid or the rust of the parts. A non-woven bag is also provided in the cavity shell 30, and the desiccant 32 is packaged in the non-woven bag. Prevent the desiccant 32 from flowing along the pipeline. The bending design of the vent pipe 20 helps to increase the difficulty of water vapor or desiccant 32 leaking along the pipeline into the gearbox body 10.

[0024] The cavity housing 30 is provided with an assembly bayonet 31 which can be buckled thereon to realize the replacement of the desiccant 32. The desiccant 32 can be replaced in time through the assembly bayonet 31.

[0025] The cavity housing 30 is connected with a downwardly extending pipeline 1 40 and a pipeline 2 50. The pipeline 1 40 and the pipeline 2 50 are provided with an L-shaped bending structure, which helps to increase the difficulty of water vapor entering the gearbox body 10 along the pipeline.

[0026] The pipeline 1 40 and the pipeline 2 50 are arranged on both sides of the gearbox body 10. Being arranged on both sides of the gearbox body 10 reduces the probability of the pipeline 1 40 and the pipeline 2 50 encountering a large external water flow at the same time, thereby greatly reducing the probability of the water flow being reversely sucked into the gearbox body 10; and because the water flow and the air quality are different, in this case, assuming that the water flow at the opening of the pipeline 1 40 is large, the water flow at this place will not be pressed into the gearbox, but the air on the opening side of the pipeline 2 50 will flow back into the gearbox body 10 to achieve the internal and external pressure difference balance, thereby avoiding the water flowing into the gearbox body 10 to cause the lubricating oil to fail, and vice versa.

[0027] The pipe 1 40 and the pipe 2 50 are both provided with a bell mouth 60 at one end away from the vent pipe 20. This helps to increase the reverse suction force when the water flows back, thereby reducing the probability of the water flowing back into the gearbox through the pipe. The bell mouth 60 is provided with a fixing clip 61 that can fix it on the gearbox body 10. The bell mouth 60 can be fixed by the fixing clip 61.

[0028] To sum up, the working principle of the present device is as follows: pipeline 1 40 and pipeline 2 50 extend to both sides of the gearbox body 10 respectively, utilizing the extremely low probability that there is a large water flow on both sides of the gearbox body 10; and because of the difference in quality between the water flow and the air, only one side of the pipeline is waded by water and no water reflux occurs, but air directly flows back into the gearbox body 10, thereby maintaining the balance of the internal and external pressure difference.

[0029] The utility model discloses a gearbox ventilation structure for reducing the probability of water ingress, in which both the first and second pipes extend downward, and can directly prevent external impurities from entering the pipes; most importantly, the first and second pipes can increase the passage for external air to enter the gearbox body, thereby reducing the probability of external water entering the gearbox body.

[0030] The terms "upper", "lower", "outer side", "inner side", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish the relative relationship in position if they exist, and do not need to be qualitative. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0031] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gearbox ventilation structure for reducing the probability of water ingress, comprising a gearbox body (10), characterized in that: The gearbox body (10) is provided with a vent (11), a vent pipe (20) is provided in the vent (11), and one end of the vent pipe (20) away from the gearbox body (10) is connected to a pipe 1 (40) and a pipe 2 (50) extending downwards.

2. A gearbox ventilation structure for reducing the probability of water ingress according to claim 1, characterized in that: Pipeline 1 (40) and pipeline 2 (50) are arranged on both sides of the gearbox body (10).

3. A gearbox ventilation structure for reducing the probability of water ingress according to claim 2, characterized in that: The ends of the pipe 1 (40) and the pipe 2 (50) away from the ventilation pipe (20) are both provided with bell mouths (60).

4. A gearbox ventilation structure for reducing the probability of water ingress according to claim 3, characterized in that: The bell mouth (60) is provided with a fixing clip (61) capable of fixing it on the gearbox body (10).

5. A gearbox ventilation structure for reducing the probability of water ingress according to claim 1, characterized in that: The pipeline 1 (40) and the pipeline 2 (50) are provided with an L-shaped bending structure.

6. A gearbox ventilation structure for reducing the probability of water ingress according to any one of claims 1 to 5, characterized in that: The ventilation pipe (20) is connected to the pipeline one (40) and the pipeline two (50) through the cavity shell (30).

7. A gearbox ventilation structure for reducing the probability of water ingress according to claim 6, characterized in that: The hollow housing (30) is filled with a desiccant (32).

8. A gearbox ventilation structure for reducing the probability of water ingress according to claim 7, characterized in that: A non-woven bag is also provided in the cavity shell (30), and the desiccant (32) is packed in the non-woven bag.

9. A gearbox ventilation structure for reducing the probability of water ingress according to claim 8, characterized in that: The cavity housing (30) is provided with an assembly bayonet (31) that can be snapped onto it to achieve replacement of the desiccant (32).

10. A gearbox ventilation structure for reducing the probability of water ingress according to any one of claims 1 to 5, characterized in that: The ventilation pipe (20) is an overall Z-shaped bending structure, and the cavity shell (30) is arranged at the lower end of the ventilation pipe (20).

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