Transmission case with venting structure

Abstract

The utility model discloses a transmission case with ventilation structure, including box and the transmission part of setting in the box, and set up on the ventilation structure of box, the ventilation structure is used for making the air communication of inside and outside box, the ventilation structure includes ventilation pipe, and the one end of ventilation pipe is provided with the air outlet and connects the outside air, and the other end is provided with the air inlet and connects the inside air of box, is provided with the air outlet maze in the ventilation pipe, the inner wall of ventilation pipe is provided with a plurality of baffles / convex parts to the opposite side extension staggered, and is provided with the gap / air hole on the baffle / convex part and supplies the airflow to pass through, forms the air outlet maze. Advantageous effect lies in: provide transmission case in the expansion space of oil, air because of high temperature, guarantee transmission case, and the air pressure balance stability of outside, can also slow down the airflow velocity simultaneously, make the oil mist condensation reflux in the passageway inner wall, reduce leakage and loss to prolong transmission case service life.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, specifically to a transmission box with a ventilation structure. Background Technology

[0002] The venting structure of the transmission case plays a crucial role in maintaining air pressure balance within the engine system. Continuous operation of the transmission case, fluctuations in outside temperature, and the vibrations of the machine or vehicle during operation can cause the gear oil temperature inside the transmission case to rise, resulting in internal air pressure exceeding external atmospheric pressure. This can lead to risks such as oil leaks at the transmission case seals, affecting not only the transmission case's lifespan but also posing safety hazards during operation. Therefore, the venting structure is extremely important. It ensures that the air pressure inside and outside the transmission case remains balanced under various conditions, extending the transmission case's lifespan and preventing oil leaks.

[0003] For example, CN220435677U discloses a transmission air pressure stabilization device piping assembly, including a vent pipe and a transmission air vent. One end of the vent pipe is connected to the transmission air vent via a connecting mechanism, and the other end of the vent pipe is fixed with an upper pipe. An inner pipe is installed inside the vent pipe, and a fixing mechanism is installed between the inner pipe and the upper pipe. As a preferred embodiment of this invention, the connecting mechanism includes a sleeve and an annular block. The annular block is fixed to the transmission air vent, and the sleeve is fixed to one end of the vent pipe and fitted above the transmission air vent. Annular baffles are fixed to both the upper and lower sides of the sleeve. A lower sleeve is slidably installed outside the sleeve between the two annular baffles, fitted outside the annular block, and connected to the annular block by threads. Its structure is simple and allows for smooth airflow; however, it lacks drainage and dust removal structures. If moisture or dust is present in the environment, it can easily enter the device through the vent, affecting the air pressure stabilization effect.

[0004] Therefore, CN108691992B describes a venting and drainage device for a gearbox, comprising: a hollow housing body; an exhaust pipe disposed on a first side of the housing body for connecting to a vent inlet of the gearbox; an upper drain pipe disposed on a second side of the housing body, the connection point of the upper drain pipe to the housing body being lower than the connection point of the exhaust pipe to the housing body; a lower drain pipe disposed at the lowest point of the bottom of the housing body; and at least one water-blocking plate disposed inside the housing body for slowing down the flow rate of water entering the housing body from the lower drain pipe to the upper drain pipe. Optionally, the water-blocking plate includes: a first horizontal plate, the first end of which is connected to the inner wall of the first side and located below the connection between the exhaust pipe and the box body; the second end of which extends toward and approaches the inner wall of the second side and is lower than the first end of the first horizontal plate; and the second end of which is located below the connection between the upper drain pipe and the box body; and a second horizontal plate disposed below the first horizontal plate, the first end of which is connected to the inner wall of the second side; the second end of which extends toward and approaches the inner wall of the first side and is lower than the first end of the second horizontal plate.

[0005] The above-mentioned solution can improve the effects of dust prevention, water blocking, drainage, and venting, reducing the chance of water contamination at the transmission vent. However, its multi-layered water-blocking plates and narrow gap design, while slowing down water flow, increase air flow resistance. Especially when the transmission is hot and the internal pressure rises rapidly, poor air venting may lead to pressure buildup inside the transmission, indirectly affecting its lifespan. Utility Model Content

[0006] The purpose of this invention is to provide a transmission box with a ventilation structure that can ensure stable air pressure and have a long service life.

[0007] To achieve the above objectives, the basic solution of this utility model provides a transmission box with a ventilation structure, including a box body and a transmission component disposed within the box body, as well as a ventilation structure disposed on the box body. The ventilation structure is used to connect the air inside and outside the box body. The ventilation structure includes a ventilation pipe, one end of which is provided with an air outlet to connect to the outside air, and the other end of which is provided with an air inlet to connect to the air inside the box body. An air outlet labyrinth is provided inside the ventilation pipe.

[0008] The beneficial effects of this basic solution are: it provides space for the expansion of oil and air inside the transmission box due to high temperature, ensuring a stable balance of air pressure inside and outside the transmission box, while also slowing down the airflow velocity, allowing oil mist to condense and flow back on the inner wall of the channel, reducing leakage and loss, thereby extending the service life of the transmission box.

[0009] Preferably, the inner wall of the vent pipe is provided with multiple baffles / protrusions extending to opposite sides in an alternating pattern, and the baffles / protrusions are provided with notches / air holes for airflow to pass through, forming the air outlet labyrinth. This can extend the path, enhance the impurity separation / blocking effect, and optimize the movement state of fluids / objects to ensure stable air pressure.

[0010] Preferably, the cross-sectional area of ​​the airflow path formed by the air outlet labyrinth is ≥ 1 / 4 of the cross-sectional area of ​​the vent pipe.

[0011] Preferably, the air vent labyrinth is located at the air vent.

[0012] Preferably, a first oil baffle is provided on the inner wall of the housing / vent pipe, extending below the air inlet and positioned between the transmission component and the air inlet to prevent fluid from splashing into the vent pipe. This also optimizes lubrication, protects components, and extends their service life.

[0013] Preferably, the first oil baffle extends downward at an angle. This prevents oil from splashing into the vent pipe, reduces oil retention, lowers gear oil churning resistance, reduces sludge buildup, and extends the service life of the lubricating oil.

[0014] Preferably, the lowest point of the first oil baffle in terms of horizontal height is higher than the highest point of the transmission component's running trajectory.

[0015] Preferably, a second baffle plate is also provided on the inner wall of the housing / vent pipe to block splashing fluid from the other direction when the transmission component reverses, so as to prevent fluid from splashing into the vent pipe.

[0016] Preferably, a flow channel is formed between the first baffle plate and the second baffle plate to allow airflow to enter and exit the vent pipe.

[0017] Preferably, the vent pipe and the housing are separate structures.

[0018] This utility model has the following beneficial effects: 1. Provides space for the expansion of oil and air in the transmission box due to high temperature, ensuring a stable balance of air pressure inside and outside the transmission box. It can also slow down the airflow speed, allowing oil mist to condense and flow back on the inner wall of the channel, reducing leakage and loss, thereby extending the service life of the transmission box.

[0019] 2. When the transmission box is working, the oil temperature rises and the internal air pressure increases, and the lubricating oil is prone to overflow with the airflow. The design of this utility model can slow down the airflow speed, allowing the oil mist to condense and flow back on the inner wall of the channel, reducing losses, avoiding component wear, and thus improving the reliability and life of the transmission box.

[0020] 3. The structure is ingenious, making replacement and maintenance relatively convenient and cost-effective. Attached Figure Description

[0021] Figure 1 This is a cross-sectional structural diagram of Embodiment 1 of the present invention. Detailed Implementation

[0022] The terms "air outlet," "air inlet," and "air outlet maze" used in this embodiment are only for ease of distinction and better understanding of the design and spatial layout of this utility model, and are not intended to limit the air outlet and air inlet.

[0023] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings are as follows: 1-box body, 2-second oil baffle, 3-air inlet, 4-vent pipe, 5-air outlet, 6-vent cap, 7-air outlet labyrinth, 8-first oil baffle, 9-transmission component.

[0024] The transmission box with a ventilation structure provided in this embodiment includes a box body 1 and a transmission component 9 disposed inside the box body 1, as well as a ventilation structure disposed on the box body 1. The ventilation structure is used to connect the air inside and outside the box body 1. The ventilation structure includes a ventilation pipe 4, one end of which is provided with an air outlet 5 to connect to the outside air, and the other end is provided with an air inlet 3 to connect to the air inside the box body 1. An air outlet labyrinth 7 is disposed inside the ventilation pipe 4.

[0025] Even better, the inner wall of the vent pipe 4 is provided with multiple baffles / protrusions extending to opposite sides in an alternating manner, and the baffles / protrusions are provided with notches / air holes for airflow to pass through, forming an air outlet labyrinth 7.

[0026] Even better, the cross-sectional area of ​​the airflow path formed by the air outlet maze 7 is ≥ 1 / 4 of the cross-sectional area of ​​the ventilator 4.

[0027] Even better, the venting maze 7 is located at the vent 5.

[0028] Even better, a first oil baffle 8 is provided on the inner wall of the housing 1 / vent pipe 4. The first oil baffle 8 extends to below the air inlet 3 and is located between the transmission component 9 and the air inlet 3 to prevent fluid from splashing into the vent pipe 4.

[0029] Even better, the first oil baffle 8 is arranged to extend downwards at an angle.

[0030] Even better, the lowest point of the first oil baffle 8 in terms of horizontal height is higher than the highest point of the running trajectory of the transmission component 9.

[0031] Even better, a second baffle plate 2 is provided on the inner wall of the housing 1 / vent pipe 4 to block the splashing fluid from the other direction when the transmission component 9 reverses, so as to prevent the fluid from splashing into the vent pipe 4.

[0032] Even better, a flow channel is formed between the first baffle plate 8 and the second baffle plate 2 to allow airflow to enter and exit the vent pipe 4.

[0033] Even better, the vent pipe 4 and the housing 1 are separate structures.

[0034] Even better, the air outlet 5 of the vent pipe 4 is also provided with a vent cap 6, and an air vent is provided on the vent pipe 4 / vent cap 6, or between the vent pipe 4 and the vent cap 6, to allow airflow to enter and exit.

[0035] Even better, transmission component 9 could be a gear.

[0036] The basic implementation examples are as follows: Figure 1 As shown: The transmission box with a ventilation structure provided in this embodiment mainly consists of a box body 1, a transmission component 9 disposed within the box body 1, and a ventilation structure mounted on the box body 1. In this embodiment, the transmission component 9 is preferably a gear. The ventilation structure is designed as a ventilation pipe 4, which is mounted on the box body. One end of the ventilation pipe 4 is provided with an air outlet 5 to connect to the outside air, and the other end is provided with an air inlet 3 extending into the box body 1 to connect to the air inside the box body 1. An air outlet labyrinth 7 is provided inside the ventilation pipe 4. Preferably, the air outlet labyrinth 7 is located at the air outlet 5.

[0037] Multiple baffles extending to opposite sides are staggered on the inner wall of the vent pipe 4, with the direction of extension of the baffles perpendicular to the inner wall of the vent pipe 4. The baffles are provided with notches to allow airflow to pass through, that is, gaps are left between the baffles and the inner wall of the vent pipe 4 on the opposite side to allow airflow to pass through, forming an air outlet labyrinth 7, the cross-sectional area of ​​the gap being 1 / 4 of the cross-sectional area of ​​the vent pipe.

[0038] The air outlet 5 of the vent pipe 4 can also be equipped with a vent cap 6. A vent is provided between the vent pipe 4 and the vent cap 6 for airflow exchange.

[0039] A first oil baffle plate 8 is provided on the inner wall of the housing 1. The first oil baffle plate 8 extends to below the air inlet 3, and is located between the gear and the air inlet 3 to block the air inlet 3 and prevent fluid from splashing into the vent pipe 4. The first oil baffle plate 8 and the air inlet 3 are separated by a gap to form a channel for airflow.

[0040] The first oil baffle 8 is arranged to extend downward at an angle. When splashed fluid hits the first oil baffle 8, the angled arrangement can increase the guiding surface, guide the lubricating oil backflow, avoid oil accumulation, and reduce splash loss. Preferably, the lowest point of the first oil baffle 8 in terms of horizontal height is higher than the highest point of the gear running trajectory, so that while blocking and guiding oil, it will not interfere with the operation of the gear.

[0041] As a further preferred option, a second oil baffle 2 is also provided on the inner wall of the housing 1 to block the splashing fluid from the other direction when the gear reverses, so as to prevent the fluid from splashing into the vent pipe 4.

[0042] Preferably, the first oil baffle 8 is disposed on the inner wall of the housing 1 on one side of the vent pipe 4, while the second oil baffle 2 can be disposed on the inner wall of the housing 1 on the other side (or opposite side) of the vent pipe 4. The second oil baffle 2 can also be disposed inclined downward to better block the splashing fluid from the other direction when the gear reverses, and prevent the fluid from splashing into the vent pipe 4.

[0043] In addition, a flow channel is formed between the first baffle plate 8 and the second baffle plate 2 to allow airflow to enter and exit the vent pipe 4.

[0044] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics of the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model. These modifications and improvements will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A transmission box with a ventilation structure, comprising a box body and a transmission component disposed within the box body, and a ventilation structure disposed on the box body, the ventilation structure being used to connect the air inside and outside the box body; characterized in that: The ventilation structure includes a ventilation pipe, one end of which is provided with an air outlet to connect to the outside air, and the other end of which is provided with an air inlet to connect to the air inside the box; an air outlet labyrinth is provided inside the ventilation pipe.

2. The transmission box with a ventilated structure according to claim 1, characterized in that: The inner wall of the vent pipe is provided with multiple baffles / protrusions extending to opposite sides in an alternating manner, and the baffles / protrusions are provided with notches / air holes for airflow to pass through, forming the air outlet labyrinth.

3. The transmission box with a ventilated structure according to claim 2, characterized in that: The cross-sectional area of ​​the airflow path formed by the air outlet labyrinth is ≥ 1 / 4 of the cross-sectional area of ​​the vent pipe.

4. The transmission box with a ventilated structure according to claim 3, characterized in that: The air vent labyrinth is located at the air vent.

5. The transmission box with a ventilated structure according to any one of claims 1-4, characterized in that: A first oil baffle is provided on the inner wall of the box / vent pipe. The first oil baffle extends to the bottom of the air inlet and is located between the transmission component and the air inlet to prevent fluid from splashing into the vent pipe.

6. The transmission box with a ventilated structure according to claim 5, characterized in that: The first oil baffle extends downward at an angle.

7. The transmission box with a ventilated structure according to claim 6, characterized in that: The lowest point of the first oil baffle is higher than the highest point of the transmission component's running trajectory.

8. The transmission box with a ventilated structure according to claim 6 or 7, characterized in that: A second baffle plate is also provided on the inner wall of the box / vent pipe to block the splashing fluid from the other direction when the transmission component reverses, so as to prevent the fluid from splashing into the vent pipe.

9. The transmission box with a ventilated structure according to claim 8, characterized in that: A flow channel is formed between the first and second oil baffles to allow airflow to enter and exit the vent pipe.

10. The transmission box with a ventilated structure according to claim 9, characterized in that: The vent pipe and the housing are separate structures.

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