A ventilation structure and transmission system

Abstract

This invention relates to the technical field, and its purpose is to provide a ventilation structure and transmission system. This ventilation structure is simple, low in manufacturing cost, does not occupy internal space, and can effectively perform ventilation and oil-gas separation. The ventilation structure includes a transmission housing and an adapter housing assembled with the transmission housing. A ventilation channel is formed only on the outer surface of the transmission housing. The ventilation channel is recessed inward from the outer surface of the transmission housing, and its extension direction is within the outer surface of the transmission housing. The ventilation channel and the outer surface of the adapter housing form a ventilation cavity. One end of the ventilation channel communicates with the interior of the transmission housing, and the other end communicates with a vent plug. This invention solves the problems of existing transmission ventilation structures being complex, having high manufacturing costs, and occupying large internal spaces.

Description

Technical Field

[0001] This invention relates to the field of transmission technology, specifically to a ventilation structure and transmission system. Background Technology

[0002] In a vehicle's transmission system, the operation of components causes the lubricating oil in the transmission housing to heat up, forming oil vapor. This oil vapor needs to be vented from the housing promptly; otherwise, excessive internal pressure can cause oil leakage from the seals. Therefore, a venting structure is required on the transmission housing to ensure that the internal pressure of the transmission housing remains consistent with atmospheric pressure when the transmission system is operating.

[0003] Existing transmission ventilation structures include a housing with a vent hole that mates with a vent plug. The vent plug is inserted into the vent hole. A boss is fixed to the inner wall of the housing near the vent plug. An oil baffle is fixed to the boss by two fastening bolts. A rib is provided between the oil baffle and the housing. The rib, oil baffle, and housing form a cavity. A gap is formed at the upper part of the cavity between the housing and the oil baffle, and a gap is formed at the lower part of the cavity between the rib and the oil baffle. This ventilation structure uses a labyrinth cavity for ventilation and oil-gas separation. It requires components such as bosses and ribs, resulting in a complex structure, high manufacturing cost, and a large internal space occupation, affecting the structural layout. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art transmission ventilation structure being complex, having high manufacturing cost, and occupying a large internal space, thereby providing a ventilation structure and transmission system that is simple in structure, low in manufacturing cost, does not occupy internal space, and can effectively perform ventilation and oil-gas separation.

[0005] To address the aforementioned problems, the present invention provides a venting structure, comprising a transmission housing and an adapter housing assembled with the transmission housing. A venting channel is formed only on the outer surface of the transmission housing. The venting channel is recessed inward from the outer surface of the transmission housing, and the extension direction of the venting channel is within the outer surface of the transmission housing. The venting channel and the outer surface of the adapter housing form a venting cavity. One end of the venting channel communicates with the interior of the transmission housing, and the other end communicates with a vent plug.

[0006] Optionally, the venting passage includes a first venting passage, a second venting passage, and a third venting passage connected in sequence. The air inlet of the first venting passage is connected to the interior of the transmission housing, and the air outlet of the third venting passage is connected to the vent plug.

[0007] Optionally, the first airway, the second airway, and the third airway are all straight airways.

[0008] Optionally, the outlet position of the first ventilation duct is higher than the inlet position of the ventilation duct, the outlet position of the second ventilation duct is higher than its inlet position, and the outlet position of the third ventilation duct is lower than its inlet position.

[0009] Optionally, the angle between the axial direction of the first airway segment and the axial direction of the second airway segment is an obtuse angle, and the angle between the axial direction of the second airway segment and the axial direction of the third airway segment is also an obtuse angle.

[0010] Optionally, the angle between the axial direction of the first air passage and the axial direction of the air passage inlet is an obtuse angle.

[0011] Optionally, the outer surface of the transmission housing is further formed with an inwardly recessed vent hole, and the outlet of the third vent passage is connected to the vent plug through the vent hole.

[0012] Optionally, the vent hole is perpendicular to the outer surface of the transmission housing.

[0013] Optionally, the adapter housing is a clutch housing.

[0014] A transmission system comprising the aforementioned ventilation structure.

[0015] The present invention has the following advantages:

[0016] (1) The ventilation structure provided by the present invention has ventilation channels formed only on the outer surface of the transmission housing, while the outer surface of the adapter housing (such as the outer surface of the clutch housing) has no ventilation channels and is a complete plane. The ventilation channels and the outer surface of the adapter housing together form a ventilation cavity. This ventilation structure is simple, and only ventilation channels need to be processed on the outer surface of the transmission housing. The manufacturing cost is low, there are no other redundant structures and components, and it does not occupy the internal space of the transmission, which can greatly save layout space.

[0017] (2) The ventilation structure provided by the present invention includes a first ventilation channel, a second ventilation channel and a third ventilation channel connected in sequence. All of them are straight ventilation channels with a certain length. The specific arrangement of the first ventilation channel, the second ventilation channel and the third ventilation channel ensures that even if some oil and gas enter the ventilation channel, this part of the oil and gas can settle in the narrow ventilation channel and flow back to the inside of the transmission housing along the inclination angle of the ventilation channel, thereby preventing the occurrence of oil leakage from the ventilation plug.

[0018] (3) The transmission system provided by the present invention has the ventilation structure of the present invention, which can effectively prevent oil leakage from the ventilation plug, maintain the same air pressure inside and outside the transmission housing, and save production and manufacturing costs and layout space. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the ventilation structure of the present invention is shown;

[0021] Figure 2 A schematic diagram of the ventilation structure of the present invention from another angle is shown;

[0022] Figure 3 An enlarged schematic diagram of the ventilation duct portion in the ventilation structure of the present invention is shown.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1-Transmission housing; 2-Ventilation passage, 201-First ventilation passage, 202-Second ventilation passage, 203-Third ventilation passage, 204-Ventilation passage inlet; 3-Ventilation chamber; 4-Ventilation plug; 5-Ventilation hole; 6-Clutch housing; 7-Boss. Detailed Implementation

[0025] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention according to the specific circumstances.

[0028] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] like Figure 1-3 The diagram shows a preferred embodiment of the ventilation structure of the present invention.

[0030] The venting structure includes a transmission housing 1 and an adapter housing assembled with the transmission housing 1; that is, this venting structure is formed jointly by the transmission housing 1 and the adapter housing. Depending on the actual application, the adapter is a transmission device used in conjunction with the transmission, such as a clutch. In this embodiment, the adapter housing is a clutch housing 6.

[0031] Specifically, the ventilation structure only has a ventilation channel 2 formed on the outer surface of the transmission housing. That is, the ventilation channel 2 is formed on the mating surface where the transmission housing 1 and the clutch housing 6 are installed. The corresponding position on the outer surface of the adapter housing does not have a ventilation channel formed and is a complete plane. The ventilation channel 2 and the outer surface of the adapter housing form a ventilation cavity 3.

[0032] The vent 2 is recessed inward from the outer surface of the transmission housing, extending within the outer surface of the transmission housing. The vent 2 is a long and narrow air passage, its specific length determined by the available space. One end of the vent 2 connects to the interior of the transmission housing, and the other end connects to the vent plug 4, which in turn connects to the atmosphere, thus maintaining consistent air pressure inside and outside the transmission housing. The vent plug 4 is located on the boss 7 on the transmission housing 1. In this embodiment, the outer surface of the transmission housing also has an inwardly recessed vent hole 5, with the axial direction of the vent hole 5 perpendicular to the outer surface of the transmission housing. The outlet of the third vent 203 connects to the vent plug 4 through the vent hole 5. For ease of processing, the cross-sectional shape of the vent 2 in this embodiment is rectangular. However, the cross-sectional shape of the vent 2 can also be circular, trapezoidal, etc., and this invention does not impose any limitations on this.

[0033] In this embodiment, the vent 2 includes a first vent 201, a second vent 202, and a third vent 203 connected sequentially. The air inlet 204 of the first vent 201 is connected to the interior of the transmission housing, and the air outlet of the third vent 203 is connected to the breather plug 4. Specifically, the first vent 201, the second vent 202, and the third vent 203 are all straight-through vents. This type of vent is easy to process and shape, reduces processing costs, and also helps to accelerate the return flow of oil and gas. To further accelerate oil and gas recirculation, the outlet position of the first ventilation duct 201 is higher than the inlet position of the gas duct 204, the outlet position of the second ventilation duct 202 is higher than its inlet position, and the outlet position of the third ventilation duct 203 is lower than its inlet position. Furthermore, the angle between the axial directions of the first ventilation duct 201 and the second ventilation duct 202 is an obtuse angle, the angle between the axial directions of the second ventilation duct 202 and the third ventilation duct 203 is also an obtuse angle, and the angle between the axial direction of the first ventilation duct 201 and the axial direction of the gas duct inlet 204 is an obtuse angle. The specific angles of these obtuse angles are set according to the actual installation space and usage requirements, and this invention does not impose any limitations on them.

[0034] Compared to the transmission housing 1, the diameter of the air passage inlet 204 is very small. The high-pressure oil and gas generated by the high-speed rotation of the gears inside the transmission has difficulty entering this narrow air passage inlet, thus preventing oil leakage from the breather plug. Moreover, the breather passage structure in this embodiment is simple. During long-term operation, even if some oil and gas enter the breather passage, this part of the oil and gas can settle in the narrow breather passage and flow back into the transmission housing 1 along the inclination angle of the breather passage, thereby achieving a good oil and gas separation effect and eliminating the occurrence of oil leakage from the breather plug.

[0035] This embodiment also provides a transmission system including the ventilation structure provided in this embodiment. By adopting this ventilation structure, the air pressure inside the transmission housing of the transmission system can be kept consistent with the atmospheric pressure. During the ventilation process, the vent plug will not leak oil. Moreover, this ventilation structure is easy to process and form, requires no redundant structures and parts, does not occupy layout space, and can achieve good oil-gas separation effect.

[0036] The ventilation process of the transmission system in this embodiment is described below:

[0037] When the transmission system is working, the gears inside the transmission rotate at high speed to generate high-pressure oil and gas. Since the diameter of the air passage inlet 204 is very small, the high-pressure oil and gas does not easily enter the ventilation chamber 3. Even if some oil and gas enter the ventilation chamber 3, since the ventilation passage 2 is narrow and has an inclination angle, this part of the oil and gas can be fully settled in the ventilation passage 2, and then flow back to the transmission housing 1 along the ventilation passage 2, thereby realizing the separation of ventilation and oil and gas.

[0038] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A ventilation structure comprising a transmission housing (1) and an adapter housing assembled with said transmission housing (1), characterized in that: A vent (2) is formed only on the outer surface of the transmission housing. The vent (2) is recessed inward from the outer surface of the transmission housing. The vent (2) extends inward from the outer surface of the transmission housing. The vent (2) and the outer surface of the adapter housing form a vent cavity (3). One end of the vent (2) is connected to the interior of the transmission housing (1), and the other end is connected to the vent plug (4). The adapter housing is a clutch housing (6). The ventilation channel (2) includes a first ventilation channel (201), a second ventilation channel (202) and a third ventilation channel (203) connected in sequence. The air inlet (204) of the first ventilation channel (201) is connected to the interior of the transmission housing (1), and the air outlet of the third ventilation channel (203) is connected to the vent plug (4). The outlet position of the first ventilation channel (201) is higher than the inlet position of the airway (204), the outlet position of the second ventilation channel (202) is higher than its inlet position, and the outlet position of the third ventilation channel (203) is lower than its inlet position. The angle between the axial direction of the first ventilation channel (201) and the axial direction of the second ventilation channel (202) is an obtuse angle, and the angle between the axial direction of the second ventilation channel (202) and the axial direction of the third ventilation channel (203) is also an obtuse angle. The outer surface of the transmission housing is also formed with an inwardly recessed vent hole (5), and the outlet of the third vent (203) is connected to the vent plug (4) through the vent hole (5).

2. The ventilation structure according to claim 1, characterized in that: The first ventilation duct (201), the second ventilation duct (202) and the third ventilation duct (203) are all straight ventilation ducts.

3. The ventilation structure according to claim 2, characterized in that: The angle between the axial direction of the first ventilation channel (201) and the axial direction of the airway inlet (204) is obtuse.

4. The ventilation structure according to claim 1, characterized in that: The vent hole (5) is perpendicular to the outer surface of the transmission housing.

5. A transmission system, characterized in that: Includes the ventilation structure described in any one of claims 1-4.

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