A gearbox and a method of venting a gearbox

Abstract

The application provides a gearbox and gearbox exhaust method, and relates to the field of gearbox exhaust. The method comprises a gearbox shell and a gearbox small cover shell, and further comprises an exhaust system. The exhaust system comprises a third exhaust hole, an exhaust channel, a ventilation plug, a second exhaust hole and a first exhaust hole which are connected in sequence. The upper end of the ventilation plug is connected with the exhaust channel, and the lower end of the ventilation plug is connected with the second exhaust hole. The third exhaust hole, the second exhaust hole and the first exhaust hole are arranged in the gearbox shell. The third exhaust hole is connected with the outside, and the first exhaust hole is connected with the inner cavity of the gearbox shell. The application can greatly avoid the blockage phenomenon, ensure smooth ventilation, and balance the air pressure inside and outside the gearbox reliably and durably.

Description

TECHNICAL FIELD

[0001] The present application relates to the gearbox exhaust field, especially to a gearbox and a gearbox exhaust method. BACKGROUND

[0002] During the operation of the gearbox, the oil temperature will rise due to the friction of the gear, bearing and other components. The lubricating oil will evaporate at high temperature, causing the internal pressure of the gearbox to rise. The gearbox breather plug can effectively balance the internal and external air pressure of the gearbox, avoid forming a vacuum or excessive air pressure, and ensure the normal operation of the gearbox. The gearbox breather plug also has certain dustproof and waterproof capabilities. It can prevent dust, impurities and moisture in the external environment from entering the interior of the gearbox, protecting the cleanliness of the gearbox and the purity of the lubricating oil.

[0003] The gearbox breather plug is generally arranged at the top of the gearbox. Rainwater from the external environment enters the interior of the gearbox through the breather plug due to the pressure difference, causing the lubricating oil to emulsify and affecting the service life of the gearbox. In the prior art, a breather pipe is used instead of the gearbox breather plug. One end of the breather pipe is provided with a breather plug, and a breather plug shell is arranged on the breather plug. The other end of the breather hose is sleeved with a breather hard pipe joint, and an O-ring is arranged on the breather hard pipe joint. This scheme changes the position of the gearbox exhaust port by arranging the breather pipe, thereby achieving the technical effect of reducing the entry of rainwater into the gearbox.

[0004] However, by using the breather pipe instead of the gearbox breather plug, the high-temperature and high-pressure oil gas generated by the high-speed operation in the interior of the gearbox is easily discharged from the breather pipe. On the one hand, this causes the loss of oil in the gearbox cavity. On the other hand, the oil adheres to the breather plug of the breather pipe, which is prone to adhere to dust in the external environment and cause blockage, thereby failing to balance the internal and external air pressure of the gearbox. SUMMARY

[0005] In order to solve the technical problem that the gearbox breather structure in the prior art is prone to blockage and cannot balance the internal and external air pressure of the gearbox for a long time, the present application provides a gearbox and a gearbox exhaust method, which can greatly avoid blockage and ensure smooth ventilation, thereby balancing the internal and external air pressure of the gearbox reliably and durably.

[0006] In a first aspect, the present application provides a gearbox to solve the above technical problems. The gearbox comprises a gearbox shell and a gearbox small cover shell, and further comprises an exhaust system. The exhaust system comprises a third exhaust hole, an exhaust channel, a breather plug, a second exhaust hole and a first exhaust hole connected in series. The upper end of the breather plug is in communication with the exhaust channel, and the lower end of the breather plug is in communication with the second exhaust hole. The third exhaust hole, the second exhaust hole and the first exhaust hole are all arranged in the gearbox shell. The third exhaust hole is in communication with the external environment, and the first exhaust hole is in communication with the internal cavity of the gearbox shell.

[0007] The application can reliably and durably balance the internal and external air pressure, and the exhaust system has a long air path, so that oil gas can be condensed, the condensed oil is sucked back into the gearbox when the pressure in the gearbox is greater than the external pressure, so that the oil is prevented from gathering in the exhaust system, and the oil loss is reduced.

[0008] Further, the exhaust passage is arranged on the end surface of the small cover shell of the gearbox in contact with the gearbox shell, and the length of the exhaust passage is not less than half the length of the small cover shell of the gearbox.

[0009] The application can increase the discharge path of the oil gas mixture, facilitate the cooling of the oil into a liquid state, and flow back into the gearbox cavity under the action of the appropriate internal and external pressure difference, so that the oil loss is reduced.

[0010] Further, the exhaust passage and the third exhaust hole are arranged vertically, the second exhaust hole and the first exhaust hole are arranged vertically, and the first exhaust hole is arranged horizontally.

[0011] The application can change the flow direction of the oil gas mixture multiple times, so that the oil gas mixture is impacted by the oil multiple times, the oil is condensed and recovered, the moving path is increased, the condensation amount is further increased, and the oil leakage is reduced.

[0012] Further, the end surface of the small cover shell of the gearbox in contact with the gearbox shell is provided with an upper flange, the corresponding position of the gearbox shell is provided with a lower flange, and the exhaust passage is arranged on the end surface of the upper flange in contact with the lower flange.

[0013] The application can achieve heat dissipation of the exhaust passage by arranging the upper flange and the lower flange, so that more oil gas is condensed.

[0014] Further, the exhaust system further comprises an air cavity, the upper end of the air hole is located in the air cavity, the air cavity is in communication with the exhaust passage, the air cavity is arranged on the small cover shell of the gearbox, and the exhaust passage is arranged on the end surface of the small cover shell of the gearbox in contact with the gearbox shell.

[0015] Further, one end of the upper flange close to the air hole is provided with a protrusion, and the air cavity is arranged in the protrusion.

[0016] The application can better dissipate heat of the air cavity by arranging the air cavity in the protrusion, so that the condensation of the oil gas is further accelerated.

[0017] Further, the exhaust passage comprises a first part, a second part and a third part in sequence, the first part is communicated with the air cavity, the third part is communicated with the third exhaust hole, the first part and the second part form an obtuse angle, and the third part and the second part are inclined to each other.

[0018] The present application can further increase the flow path of the oil-gas mixture, increase the oil-gas condensation, and further make the water from the outside away from the breather plug.

[0019] Further, the first exhaust hole is arranged on the upper part of the gearbox housing and away from the transmission component.

[0020] The present application can greatly reduce the leakage of the lubricating oil splashed by the movement of the transmission component from the first exhaust hole, and further reduce the oil loss.

[0021] Further, the breather plug is a normally closed type.

[0022] In the second aspect, the present application further provides a gearbox exhaust method, which uses the above-mentioned gearbox, the oil-gas mixture generated in the gearbox cavity is sequentially discharged to the atmosphere through the first exhaust hole, the second exhaust hole, the breather plug, the exhaust passage and the third exhaust hole, the oil generated in the oil-gas mixture condensation in the exhaust passage, and the oil is returned to the gearbox interior through the breather plug after the cooling of the gearbox.

[0023] From the above technical solutions, the present application has the following advantages:

[0024] The application provides a gearbox and a gearbox exhaust method, by arranging an exhaust system inside the gearbox, the air vent plug is less likely to be blocked by dust from the external environment, can reliably and durably balance the internal and external air pressure, and the exhaust system has a long air path, so that oil gas can be condensed, when the pressure inside the gearbox is greater than the external pressure, the condensed oil is sucked back into the gearbox, avoiding the accumulation of oil in the exhaust system, and also reducing oil loss; by arranging a long exhaust passage, on the one hand, the oil gas mixture can be discharged along a long path, facilitating the cooling of the oil into a liquid state and flowing back into the gearbox cavity under the action of a suitable internal and external pressure difference, reducing oil loss; on the other hand, it can also prevent water vapor in the external environment from entering the exhaust passage under the action of the pressure difference and accumulating near the air vent plug, reducing the entry of water from the external environment into the gearbox cavity; by changing the flow direction of the oil gas mixture multiple times, on the one hand, the oil gas mixture is impacted multiple times to accumulate oil, facilitating the condensation and recovery of the oil, on the other hand, the moving path is increased, further increasing the condensation amount and reducing oil leakage; by arranging the upper flange and the lower flange, heat dissipation of the exhaust passage can be realized, so that more oil gas can be cooled; by arranging the air cavity in the protrusion, the air cavity can be better cooled, further accelerating the condensation of the oil gas; by adopting a non-flat structure for the exhaust passage, the flow path of the oil gas mixture can be further increased, the oil gas condensation can be increased, and the water from the external environment can be further away from the air vent plug. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed to be used in the description, and obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0026] Figure 1 Partial structure diagram of the first embodiment of the present application Figure 1 .

[0027] Figure 2 Partial structure diagram of the gearbox small cover shell in the first embodiment of the present application.

[0028] Figure 3 Partial structure diagram of the gearbox shell in the first embodiment of the present application Figure 1 .

[0029] Figure 4 Partial structure diagram of the gearbox shell in the first embodiment of the present application Figure 2 .

[0030] Figure 5 Partial structure diagram of the first embodiment of the present application Figure 2 .

[0031] In the diagram, 1 is the gearbox housing; 2 is the gearbox cover housing; 3 is the vent plug; 4 is the third exhaust port; 5 is the exhaust passage; 501 is the first part; 502 is the second part; 503 is the third part; 6 is the air chamber; 7 is the second exhaust port; 8 is the first exhaust port; 9 is the upper flange; 10 is the protrusion; and 11 is the lower flange. Detailed Implementation

[0032] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0033] Specifically, it is implementation method one.

[0034] like Figures 1 to 4 As shown in the figure, this specific embodiment provides a gearbox, including a gearbox housing 1 and a gearbox cover housing 2, and also includes an exhaust system. The exhaust system includes a third exhaust port 4, an exhaust passage 5, a vent plug 3, a second exhaust port 7, and a first exhaust port 8 that are connected to each other. The upper end of the vent plug 3 is connected to the exhaust passage 5, and the lower end of the vent plug 3 is connected to the second exhaust port 7. The third exhaust port 4, the second exhaust port 7, and the first exhaust port 8 are all disposed inside the gearbox housing 1. The third exhaust port 4 is connected to the outside, and the first exhaust port 8 is connected to the inner cavity of the gearbox housing 1.

[0035] This specific embodiment places the exhaust system inside the gearbox, so the vent plug 3 has less contact with dust from the external environment and is less prone to clogging. It can reliably and persistently balance the internal and external air pressure. In addition, the exhaust system has a long air passage, which allows oil and gas to condense. When the pressure inside the gearbox is greater than the external pressure, the condensed oil is drawn back into the gearbox, preventing oil from accumulating in the exhaust system and reducing oil loss.

[0036] like Figure 1 and Figure 4 As shown, in order to facilitate the installation of the vent plug 3, in this specific embodiment, the exhaust system also includes an air chamber 6. The upper end of the vent plug 3 is located in the air chamber 6. The air chamber 6 is connected to the exhaust passage 5. The air chamber 6 is set on the gearbox cover housing 2. The exhaust passage 5 is set on the end face of the gearbox cover housing 2 that contacts the gearbox housing 1.

[0037] like Figures 1 to 4As shown, to enhance the oil-gas condensation effect, this specific embodiment employs a technical concept of extending the flow path of the oil-gas mixture. Specifically, the exhaust duct 5 is located on the end face where the gearbox cover housing 2 contacts the gearbox housing 1, and the length of the exhaust duct 5 is not less than half the length of the gearbox cover housing 2. By making the exhaust duct 5 longer, on the one hand, the discharge path of the oil-gas mixture can be increased, facilitating the oil to cool into a liquid state and flow back into the gearbox cavity under the action of a suitable internal and external pressure difference (the gearbox pressure is greater than the external pressure), reducing oil loss; on the other hand, making the exhaust duct 5 longer ensures that the third exhaust port 4 is farther from the vent plug 3, preventing moisture from the external environment from entering the exhaust duct 5 under the action of the pressure difference and accumulating near the vent plug 3, reducing the risk of moisture from the outside entering the gearbox cavity and causing oil emulsification. In this specific embodiment, the exhaust duct 5 and the third exhaust port 4 are arranged perpendicularly. The second exhaust port 7 and the first exhaust port 8 are set vertically, the first exhaust port 8 is set horizontally, and the exhaust channel 5 is also perpendicular to the air chamber 6. By changing the flow direction of the oil-gas mixture multiple times, on the one hand, the oil-gas mixture is made to collide multiple times and the oil accumulates, increasing the movement path and increasing the condensation effect. On the other hand, the vent plug 3 changes direction up and down, which can reduce the oil and gas ejection and reduce oil leakage. In order to further extend the path, the exhaust channel 5 includes a first part 501, a second part 502 and a third part 503 in sequence. The first part 501 is connected to the air chamber 6, the third part 503 is connected to the third exhaust port 4, the angle between the first part 501 and the second part 502 is an obtuse angle, and the third part 503 is inclined to the second part 502. By adopting a non-straight structure for the exhaust channel 5, the flow path of the oil-gas mixture can be further increased, the oil and gas condensation can be increased, and the water entering from the outside can be further moved away from the vent plug 3 and accumulated.

[0038] like Figure 5 As shown, in order to further increase the oil and gas condensation effect and accelerate condensation, in this specific embodiment, an upper flange 9 is provided on the side of the end of the gearbox cover housing 2 that contacts the gearbox housing 1, and a lower flange 11 is provided at the corresponding position of the gearbox housing 1. The exhaust passage 5 is provided on the end face of the upper flange 9 and the lower flange 11 that contact each other. Since a variety of components are installed on the gearbox housing 1, in order to avoid interference, the thickness of the lower flange 11 is less than the thickness of the upper flange 9. By providing the upper flange 9 and the lower flange 11, the wall thickness of the upper part of the exhaust passage 5 can be reduced, thereby achieving heat dissipation of the exhaust passage 5 and allowing more oil and gas to condense. Similarly, a protrusion 10 is provided at the end of the upper flange 9 near the vent plug 3, and an air chamber 6 is provided inside the protrusion 10.

[0039] In the prior art, lubrication is achieved by the movement of the transmission components installed in the gearbox cavity, which drives the lubricating oil to splash. In order to prevent the splashed lubricating oil from leaking out from the first vent hole 8, in this specific embodiment, the first vent hole 8 is located on the upper part of the gearbox housing 1 and away from the transmission components, and the vent plug 3 is a normally closed vent plug 3.

[0040] It can be found that the specific embodiment greatly enhances the condensation effect of oil gas in the oil gas mixture by adopting the way of prolonging the oil gas discharge path, changing the direction of oil gas movement multiple times and increasing the heat dissipation effect, and the oil gas is sucked back into the cavity under the action of the gearbox, reducing the loss of oil. Meanwhile, the vent plug 3 is arranged in the gearbox, which realizes comprehensive rain and dust prevention of the vent plug 3, and the exhaust path is arranged to be relatively long, which increases the difficulty of water from the outside reaching the vent plug 3 and accumulating near the vent plug 3, effectively avoiding the occurrence of oil emulsification caused by the water from the outside entering the gearbox. Specific embodiment two

[0042] The specific embodiment provides a gearbox exhaust method, and the oil gas mixture generated in the gearbox cavity is discharged to the atmosphere in turn through the first exhaust hole 8, the second exhaust hole 7, the vent plug 3, the exhaust channel 5 and the third exhaust hole 4. The oil generated in the exhaust channel 5 is returned to the inside of the gearbox through the vent plug 3 after the gearbox is cooled.

[0043] When the temperature of the gearbox is very high, the oil in the cavity is vaporized to form an oil gas mixture (the component is oil, and the state is gaseous and liquid), the external air pressure is greater than the internal air pressure of the gearbox, the oil gas mixture passes through the first exhaust hole 8, changes direction (a part of the oil in the oil gas mixture accumulates here), enters the vent plug 3 from the second exhaust hole 7, and when the pressure difference reaches a certain degree, the oil gas mixture is sprayed out of the vent plug 3 to the air cavity 6, changes direction (a part of the oil in the oil gas mixture accumulates here), enters the exhaust channel 5, and since the wall of the air cavity 6 and the exhaust channel 5 is thin, the cooling effect is obvious. The oil gas in the oil gas mixture condenses into oil which accumulates near the vent plug 3, only a part of the oil in the oil gas mixture flows along the exhaust channel 5 and continuously condenses and accumulates in the process, changes direction (a part of the oil in the oil gas mixture accumulates here), enters the third exhaust hole 4, and at this time, only a small amount of oil gas is discharged; it can be seen that the gearbox greatly reduces the loss and leakage of oil; after the gearbox is cooled, the oil accumulated in the exhaust system is sucked back into the cavity of the gearbox, and at the same time, the water from the outside is also sucked back into the exhaust system. However, since the exhaust system exists multiple times of change of direction and the exhaust channel 5 is relatively long, the water accumulates at a position far away from the vent plug 3, and the accumulated water volume becomes large and no longer moves, so the water cannot enter the cavity of the gearbox, avoiding oil emulsification.

[0044] It can be seen from the above specific embodiment that the present application has the following beneficial effects:

[0045] 1. By arranging the exhaust system inside the gearbox, the vent plug 3 has less contact with dust from the external environment, making it less prone to clogging. It can reliably and persistently balance the internal and external air pressure. In addition, the exhaust system has a long air passage, which allows oil and gas to condense. When the pressure inside the gearbox is greater than the external pressure, the condensed oil is drawn back into the gearbox, preventing oil from accumulating in the exhaust system and reducing oil loss.

[0046] 2. By making the exhaust passage 5 longer, on the one hand, the exhaust path of the oil-gas mixture can be increased, which makes it easier for the oil to cool into a liquid state and flow back into the gearbox cavity under the action of a suitable internal and external pressure difference, thus reducing oil loss; on the other hand, it can also prevent moisture from the external environment from entering the exhaust passage 5 under the action of pressure difference and accumulating near the vent plug 3, thus reducing the amount of moisture from the outside entering the gearbox cavity.

[0047] 3. By repeatedly changing the flow direction of the oil-gas mixture, on the one hand, the oil-gas mixture is subjected to multiple collisions, resulting in oil accumulation, which facilitates oil condensation and recovery; on the other hand, the movement path is increased, further increasing the amount of condensation and reducing oil leakage.

[0048] 4. By setting the upper flange 9 and the lower flange 11, heat dissipation of the exhaust passage 5 can be achieved, allowing more oil and gas to be cooled;

[0049] 5. By placing the air chamber 6 inside the protrusion 10, the air chamber 6 can be better cooled, further accelerating the condensation of oil and gas;

[0050] 6. By adopting a non-straight structure for the exhaust duct 5, the flow path of the oil-gas mixture can be further increased, the condensation of oil and gas can be increased, and the water entering from the outside can be further moved away from the vent plug 3.

[0051] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily 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 invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gearbox, comprising a gearbox housing (1) and a gearbox cover housing (2), characterized in that, It also includes an exhaust system, which includes a third exhaust port (4), an exhaust passage (5), a vent plug (3), a second exhaust port (7), and a first exhaust port (8) that are connected. The upper end of the vent plug (3) is connected to the exhaust passage (5), and the lower end of the vent plug (3) is connected to the second exhaust port (7). The third exhaust port (4), the second exhaust port (7), and the first exhaust port (8) are all located inside the gearbox housing (1). The third exhaust port (4) is connected to the outside, and the first exhaust port (8) is connected to the inner cavity of the gearbox housing (1). The exhaust duct (5) is located on the end face of the gearbox cover housing (2) that contacts the gearbox housing (1), and the length of the exhaust duct (5) is not less than half the length of the gearbox cover housing (2); The gearbox cover housing (2) is provided with an upper flange (9) on the side of the end that contacts the gearbox housing (1), and the gearbox housing (1) is provided with a lower flange (11) at the corresponding position. The exhaust port (5) is provided on the end face where the upper flange (9) and the lower flange (11) contact. The exhaust passage (5) includes a first part (501), a second part (502) and a third part (503) in sequence. The first part (501) is connected to the air chamber (6), and the third part (503) is connected to the third exhaust port (4). The angle between the first part (501) and the second part (502) is an obtuse angle, and the third part (503) and the second part (502) are inclined to transition.

2. The gearbox as described in claim 1, characterized in that, The exhaust duct (5) and the third exhaust port (4) are set vertically, the second exhaust port (7) and the first exhaust port (8) are set vertically, and the first exhaust port (8) is set horizontally.

3. The gearbox as described in claim 2, characterized in that, The exhaust system also includes an air chamber (6), the upper end of the vent plug (3) is located in the air chamber (6), the air chamber (6) is connected to the exhaust passage (5), the air chamber (6) is set on the gearbox cover housing (2), and the exhaust passage (5) is set on the end face of the gearbox cover housing (2) that contacts the gearbox housing (1).

4. The gearbox as described in claim 3, characterized in that, A protrusion (10) is provided at one end of the upper flange (9) near the vent plug (3), and an air cavity (6) is provided inside the protrusion (10).

5. The gearbox as described in claim 1, characterized in that, The first exhaust port (8) is located on the upper part of the gearbox housing (1) and away from the transmission components.

6. The gearbox as claimed in claim 1, characterized in that, The vent plug (3) is a normally closed vent plug (3).

7. A method for venting exhaust from a gearbox, characterized in that, The transmission as described in claim 4 is characterized in that the oil-gas mixture generated in the transmission cavity is discharged to the atmosphere in sequence through the first exhaust port (8), the second exhaust port (7), the vent plug (3), the exhaust passage (5) and the third exhaust port (4), and the oil generated by the condensation of the oil-gas mixture in the exhaust passage (5) flows back to the transmission interior through the vent plug (3) after the transmission is cooled.

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