Drive axle exhaust structure and construction vehicle

Abstract

The application provides a driving axle exhaust structure and engineering vehicle, and relates to the technical field of vehicle driving axle.The driving axle exhaust structure comprises an axle housing, an oil baffle and an oil discharge assembly.The axle housing is provided with a ventilation hole;the oil baffle is arranged in the axle housing, one side of the oil baffle is provided with an opening, the oil baffle is arranged on the ventilation hole, and the oil baffle comprises an oil baffle body, two ends of the oil baffle body are provided with an oil inlet part and an oil outlet part, the oil inlet part, the oil outlet part, an inner cavity of the axle housing and the ventilation hole are communicated;the oil discharge assembly is arranged in the oil baffle, the oil discharge assembly comprises a rotatable impeller, the oil inlet part and the oil outlet part are located on the two sides of the radial direction of the impeller, and an airflow gap exists between the impeller and the ventilation hole.The application can solve the problem that the ventilation hole of the driving axle in the prior art is easily blocked by lubricating oil, the air pressure in the driving axle housing is increased, the sealing is invalid, and oil leakage occurs, has the effects of preventing the ventilation hole from being blocked and balancing the pressure inside and outside the driving axle housing.

Description

Technical Field

[0001] This invention relates to the field of vehicle drive axle technology, specifically to a drive axle exhaust structure and an engineering vehicle. Background Technology

[0002] A drive axle typically consists of a final drive, differential, wheel transmission, and drive axle housing. The drive axle housing is a closed structure that houses the transmission components. It contains lubricating oil, which is sprayed out by the rotation of gears. During vehicle operation, the meshing of gears, the rolling of bearings, and the lubrication of the oil generate a significant amount of heat within the drive axle housing. This increases the air pressure inside the housing, necessitating vents to balance the internal and external atmospheric pressure. However, because the lubricating oil splashes out during operation, some of it can enter the vents, causing blockage, further increasing the air pressure inside the housing, leading to seal failure and oil leakage. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defect that the vent hole of the drive axle in the prior art is easily blocked by lubricating oil, which leads to increased air pressure in the drive axle housing, sealing failure, and oil leakage. The present invention provides a drive axle exhaust structure and engineering vehicle.

[0004] To address the aforementioned problems, this invention provides a drive axle exhaust structure, comprising an axle housing, an oil baffle, and an oil drain assembly. The axle housing has a vent hole; the oil baffle is disposed within the axle housing, with one side open and covering the vent hole. The oil baffle includes an oil baffle body, with an oil inlet and an oil outlet at both ends, and the oil inlet, oil outlet, the inner cavity of the axle housing, and the vent hole are connected; the oil drain assembly is disposed within the oil baffle, and includes a rotatable impeller, with the oil inlet and oil outlet located on opposite radial sides of the impeller, and an airflow gap existing between the impeller and the vent hole.

[0005] Optionally, the flow areas of the oil inlet and oil outlet gradually decrease along the directions in which they are opposite to each other.

[0006] Optionally, at least one oil drain hole is provided at the lowest position of the oil baffle.

[0007] Optionally, the oil discharge assembly also includes a wheel shaft, which is mounted on the bridge housing, and the impeller is rotatably mounted on the wheel shaft.

[0008] Optionally, the axle is arranged parallel to the axial direction of the vent.

[0009] Optionally, the impeller includes a sleeve and blades spaced circumferentially on the sleeve. The sleeve is fitted onto the shaft, and an annular first airflow gap is formed between the inner circumferential wall of the sleeve and the outer circumferential wall of the shaft.

[0010] Optionally, the impeller may also include a baffle located at one end of the sleeve near the oil baffle, the baffle covering one end face of the cylinder formed by the sleeve and the blades.

[0011] Optionally, the axle is a hollow axle, and there is a second airflow gap between the baffle and the first end of the axle. The first airflow gap, the second airflow gap, and the vent are connected.

[0012] Optionally, it also includes a vent assembly, the first end of which is inserted into the vent hole and extends into the cavity of the wheel axle, and the second end of which extends away from the vent hole.

[0013] Optionally, the vent assembly includes a vent pipe and a pipe connector; the first end of the pipe connector is inserted into the vent hole and extends into the cavity of the wheel axle, and the second end of the pipe connector is connected to the vent pipe.

[0014] Optionally, the pipe fitting and the vent pipe are connected by a plug-in structure; the plug-in structure includes a mating plug and a plug hole, one of the pipe fitting and the vent pipe is provided with a plug, and the other of the pipe fitting and the vent pipe is provided with a plug hole, and there is a tapered sealing surface between the plug hole and the plug.

[0015] Optionally, the second end of the vent assembly has at least one bend.

[0016] Another aspect of the present invention provides an engineering vehicle including the drive axle exhaust structure described in any of the above technical solutions.

[0017] The present invention has the following advantages:

[0018] 1. Using the technical solution provided by the present invention, the oil baffle is installed inside the axle housing of the drive axle, and the open side of the oil baffle is aligned with the vent hole on the axle housing of the drive axle, so that the oil baffle covers the vent hole. The oil baffle body can block the splashed lubricating oil and prevent the lubricating oil from splashing to the vent hole and causing the vent hole to become blocked. Because the oil baffle body has an oil inlet and an oil outlet at both ends, and an oil discharge assembly is installed in the inner cavity of the oil baffle, the rotation of the impeller can drive the lubricating oil entering the oil baffle from the oil inlet to the oil outlet and out, ensuring timely oil discharge from the oil baffle and effectively preventing the vent hole from being blocked by oil. This ensures the normal operation of the vent hole. Furthermore, because the oil inlet, oil outlet, inner cavity of the axle housing, and vent hole are connected, the gas inside the axle housing of the drive axle enters the inner cavity of the oil baffle from the oil inlet or oil outlet, passes through the airflow gap between the impeller and the vent hole, reaches the vent hole, and is discharged from the vent hole. This ensures the air pressure balance inside and outside the axle housing of the drive axle, and prevents the seal from failing and causing oil leakage due to blockage of the vent hole or increase in air pressure inside the axle housing.

[0019] 2. The flow area of ​​the oil inlet and the oil outlet gradually decreases along opposite directions. The smaller oil inlet can further prevent lubricating oil from entering the vent hole. Furthermore, the flow area gradually increases from the oil inlet to the inner cavity of the oil baffle, which can reduce the impact of lubricating oil during the process of entering the inner cavity of the oil baffle and prevent secondary splashing of lubricating oil inside the oil baffle.

[0020] 3. An oil drain hole is provided at the lowest point of the oil baffle to prevent lubricating oil that has not been drained in time from accumulating at the lowest point of the oil baffle. The oil drain hole can drain the oil accumulated in the oil baffle, preventing the oil from clogging the vent hole. In addition, the drained oil falls back into the axle housing of the drive axle for gear lubrication. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a schematic diagram of the oil baffle in the drive axle exhaust structure provided in an embodiment of the present invention from one perspective;

[0023] Figure 2 It shows Figure 1 A structural schematic diagram of the oil baffle from another perspective;

[0024] Figure 3 A schematic diagram of the drive axle exhaust structure provided in an embodiment of the present invention is shown;

[0025] Figure 4 A schematic diagram showing the arrangement of the oil baffle on the axle housing from a top-down perspective is provided.

[0026] Figure 5 A sectional view showing the arrangement of the oil baffle on the axle housing from a side view is shown;

[0027] Figure 6 A schematic diagram of the impeller in the oil discharge assembly is shown;

[0028] Figure 7 A cross-sectional view of the assembly of the oil baffle, oil drain assembly, and axle housing is shown.

[0029] Figure 8 A schematic diagram of the venting tube assembly is shown.

[0030] Figure 9 A schematic diagram of the connection structure of the vent pipe and pipe joint is shown;

[0031] Figure 10 It shows Figure 3 A magnified view of a portion of point A in the middle.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Oil baffle; 11. Oil baffle body; 111. Oil baffle main plate; 112. Oil baffle side plate; 113. Connecting edge; 12. Oil inlet; 13. Oil outlet; 14. Oil drain hole; 2. Vent hole; 3. Oil drain assembly; 31. Impeller; 311. Sleeve; 312. Blade; 313. Baffle; 32. Wheel shaft; 4. Vent pipe assembly; 41. Vent pipe; 411. Connector; 412. Bending structure; 42. Pipe joint; 421. Connecting hole; 20. Bridge housing; 30. Lubricating oil; 40. Transmission structure; 51. First airflow gap; 52. Second airflow gap. Detailed Implementation

[0034] 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.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the 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.

[0036] 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.

[0037] Furthermore, 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.

[0038] To facilitate the introduction of the technical solution of the present invention, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments, but the embodiments should not be regarded as limitations on the present invention.

[0039] Example 1

[0040] A drive axle exhaust structure, reference Figures 1-10 The system includes a bridge housing 20, an oil baffle 1, and an oil drain assembly 3. The bridge housing 20 is provided with a vent hole 2. The oil baffle 1 is located inside the bridge housing 20, with one side open and covering the vent hole 2. The oil baffle 1 includes an oil baffle body 11, with an oil inlet 12 and an oil outlet 13 at both ends. The oil inlet 12, the oil outlet 13, the inner cavity of the bridge housing 20, and the vent hole 2 are connected. The oil drain assembly 3 is located inside the oil baffle 1 and includes a rotatable impeller 31. The oil inlet 12 and the oil outlet 13 are located on both sides of the impeller 31 in the radial direction. There is an airflow gap between the impeller 31 and the vent hole 2.

[0041] Using the technical solution provided by the present invention, the oil baffle 1 can be installed inside the axle housing 20 of the drive axle. The open side of the oil baffle 1 is aligned with the vent hole 2 on the axle housing 20 of the drive axle, so that the oil baffle 1 covers the vent hole 2. The oil baffle body 11 can block the splashed lubricating oil 30 and prevent the lubricating oil 30 from splashing to the vent hole 2, causing the vent hole 2 to be blocked. Because the oil baffle body 11 has an oil inlet 12 and an oil outlet 13 at both ends, and an oil drain assembly 3 is provided in the inner cavity of the oil baffle 1, the rotation of the impeller 31 can drive the lubricating oil entering the oil baffle 1 from the oil inlet 12 to the oil outlet 13 to flow out, ensuring timely oil drainage in the oil baffle 1 and effectively preventing the vent hole 2 from being blocked by oil, thereby ensuring the normal operation of the vent hole 2. Furthermore, because the oil inlet 12, the oil outlet 13, the inner cavity of the bridge housing 20 and the vent hole 2 are connected, and there is an airflow gap between the impeller 31 and the vent hole 2, the gas inside the bridge housing 20 of the drive axle enters the inner cavity of the oil baffle 1 from the oil inlet 12 or the oil outlet 13, and reaches the vent hole 2 through the airflow gap between the impeller 31 and the vent hole 2, and is discharged from the vent hole 2, ensuring the air pressure inside and outside the bridge housing 20 of the drive axle is balanced, and preventing the seal from failing due to blockage of the vent hole 2 or increase in air pressure inside the bridge housing 20, thus preventing oil leakage.

[0042] Specifically, the airflow gap between the impeller 31 and the vent 2 can be formed by an installation gap. In some embodiments, the impeller 31's shaft 32 is a solid shaft, and the shaft 32 and the vent 2 are arranged in a staggered manner, or the shaft 32 and the vent 2 are arranged coaxially, but an installation gap is left between the end face of the shaft 32 and the vent 2. In some other embodiments, the shaft 32 is a hollow shaft, and the shaft 32 and the vent 2 can be arranged in a staggered or coaxial manner.

[0043] Optional, refer to Figure 1 Along the direction in which the oil inlet 12 and the oil outlet 13 are opposite to each other, the flow area of ​​the oil inlet 12 and the oil outlet 13 gradually decreases. The smaller oil inlet 12 can further prevent lubricating oil 30 from entering the vent hole 2. Moreover, from the oil inlet 12 to the inner cavity of the oil baffle 1, the flow area gradually increases, which can reduce the impact of lubricating oil 30 during the process of entering the inner cavity of the oil baffle 1, and prevent the lubricating oil 30 from generating secondary splashing inside the oil baffle 1.

[0044] Specifically, such as Figure 1 The end of the oil inlet 12 is the oil inlet, and the end of the oil outlet 13 is the oil outlet. When the oil baffle 1 is installed inside the axle housing 20 of the drive axle, the inner cavity of the axle housing 20, the oil inlet, the inner cavity of the oil baffle 1, the oil outlet, and the vent 2 are interconnected. Of course, the oil outlet 13 can also receive oil, and correspondingly, the oil inlet 12 can also discharge oil. Specifically, when the transmission structure 40 inside the axle housing 20 of the drive axle rotates forward, assuming that... Figure 5From the perspective of orientation, if the rotation is clockwise, the lubricating oil 30 splashes from the front of the drive axle to the rear. At this time, the splashed lubricating oil 30 enters from the left end of the oil baffle 1 and exits from the right end, that is, oil enters from the oil outlet 13 and exits from the oil inlet 12; when the transmission structure 40 reverses, the lubricating oil 30 splashes from the front of the drive axle to the rear. Figure 5 From the perspective of the direction, the reverse is a counterclockwise rotation, and the lubricating oil 30 splashes from the rear of the drive axle to the front. At this time, the splashed lubricating oil 30 enters from the right end of the oil baffle 1 and exits from the left end, that is, oil enters from the oil inlet 12 and exits from the oil outlet 13.

[0045] Optional, refer to Figure 1 and Figure 2 The oil baffle body 11 includes an oil baffle main plate 111 and oil baffle side plates 112 disposed on both sides of the oil baffle main plate 111, with a gap between the two oil baffle side plates 112 to form an opening.

[0046] Optionally, each oil baffle side plate 112 is provided with a connecting edge 113 facing away from the inner cavity of the oil baffle cover 1. The connecting edge 113 facilitates the connection of the oil baffle cover 1 to the axle housing 20 of the drive axle. Specifically, in this embodiment, the oil baffle cover 1 and the axle housing 20 of the drive axle are welded together.

[0047] Optionally, at least one oil drain hole 14 is provided at the lowest position of the oil baffle 1. Specifically, refer to... Figure 1 In this embodiment, two oil drain holes 14 are provided on the lower oil baffle side plate 112. The oil baffle 1 is disposed inside the axle housing 20 of the drive axle, and the oil drain holes 14 are located at the lowest point of the oil baffle 1 to drain the oil accumulated inside the oil baffle 1. This prevents the lubricating oil 30 that is not drained in time from accumulating at the lowest point of the oil baffle 1. The oil drain holes 14 can drain the oil accumulated inside the oil baffle 1, preventing the oil from clogging the vent hole 2; and the drained oil falls back into the axle housing 20 of the drive axle for gear lubrication.

[0048] Specifically, refer to Figure 3 The drive axle housing 20 houses a transmission structure 40, which includes a reducer assembly. After assembly, an appropriate amount of lubricating oil 30 is added to the axle housing 20. The center line of the reducer assembly is immersed in the lubricating oil 30. The gears in the reducer assembly are lubricated by splash lubrication.

[0049] By utilizing the drive axle exhaust structure provided by the present invention, the oil baffle 1 can effectively prevent lubricating oil 30 from splashing into the vent 2 and causing blockage of the vent 2, ensuring the normal operation of the vent 2, ensuring the air pressure balance inside and outside the axle housing 20 of the drive axle, and preventing seal failure and oil leakage due to blockage of the vent 2 and increased air pressure inside the axle housing 20.

[0050] Optional, refer to Figure 3The oil baffle 1 is located above the transmission structure 40 inside the axle housing 20. The oil baffle 1 has an oil drain hole 14, which is located at the lowest position of the oil baffle 1. When the lubricating oil 30 enters the oil baffle 1, it can be discharged through the bottom oil drain hole 14 and fall into the axle housing 20 of the drive axle, and then be used for lubrication of the transmission structure 40 again.

[0051] Reference Figure 4 and Figure 5 In the diagram, direction A indicates the front of the drive axle, direction B indicates the rear of the drive axle, and the oil inlet and outlet directions of the oil baffle 1 are set along the front-rear direction of the drive axle.

[0052] Optionally, the oil discharge assembly 3 also includes a wheel shaft 32, which is mounted on the axle housing 20, and the impeller 31 is rotatably mounted on the wheel shaft 32. In this embodiment, the wheel shaft 32 is welded to the axle housing 20 of the drive axle.

[0053] Optional, such as Figure 6 As shown, the impeller 31 includes a sleeve 311 and blades 312 spaced circumferentially on the sleeve 311. The sleeve 311 is fitted onto the wheel shaft 32, and an annular first airflow gap 51 is formed between the inner circumferential wall of the sleeve 311 and the outer circumferential wall of the wheel shaft 32.

[0054] Optional, refer to Figure 6 The impeller 31 also includes a baffle 313 located at one end of the sleeve 311 near the oil baffle 1, the baffle 313 covering one end face of the cylinder formed by the sleeve 311 and the blade 312.

[0055] Optionally, the blades 312 are helical. The sides of each blade 312 are connected to the baffle 313.

[0056] Optional, refer to Figure 7 The axle 32 is a hollow structure, and a second airflow gap 52 is formed between the baffle 313 and the first end of the axle 32. The first airflow gap 51, the second airflow gap 52 and the vent 2 are connected.

[0057] Exhaust process: When the air pressure inside the axle housing 20 of the drive axle is greater than the external air pressure, the gas enters the oil baffle 1 from the oil inlet 12 or the oil outlet 13, passes through the first airflow gap 51 and the second airflow gap 52 in sequence to reach the vent 2, and is finally discharged from the vent 2, thereby achieving the balance of internal and external air pressure of the axle housing 20 of the drive axle.

[0058] Specifically, in this embodiment, the width of the first airflow gap 51 is 0.5-1.5mm, and the width of the second airflow gap 52 is 4-6mm. In this embodiment, the width of the first airflow gap 51 is 1mm, meaning the diameter of the inner circumferential wall of the sleeve 311 is 2mm larger than the diameter of the outer circumferential wall of the axle 32. The second airflow gap 52 is 5mm, meaning the gap width between the end face of the axle 32 near the oil baffle 1 and the baffle 313 is 5mm. When the end face of the sleeve 311 is flush with the end face of the axle 32 at the end away from the oil baffle 1, the axial length of the sleeve 311 is 5mm larger than the axial length of the axle 32.

[0059] The baffle 313 is located on the side near the oil baffle 1, which can prevent the lubricating oil 30 from flowing into the shaft 32 from the end of the shaft 32 near the oil baffle 1 under the drive of the impeller 31, and then into the vent hole 2.

[0060] Optionally, the axle 32 is arranged parallel to the axial direction of the vent hole 2. In this embodiment, the axle 32 and the vent hole 2 are arranged coaxially.

[0061] Optionally, the axle 32 is fixedly mounted on the axle housing 20 of the drive axle, and the sleeve 311 of the impeller 31 is rotatably fitted onto the axle 32. The rotation of the impeller 31 is driven by the lubricating oil 30 entering through the oil inlet 12. The lubricating oil 30 enters the oil baffle 1 from the oil inlet 12, driving the impeller 31 to rotate. The rotation of the impeller 31 guides the lubricating oil 30 from the oil inlet 12 to the oil outlet 13, thereby flowing out of the oil baffle 1 and preventing excessive oil accumulation in the oil baffle 1. The rotation of the impeller 31 effectively prevents the lubricating oil 30 from entering the vent hole 2.

[0062] Optionally, the drive axle exhaust structure also includes a vent pipe assembly 4, with a first end inserted into the vent hole 2 and extending into the cavity of the wheel axle 32, and a second end extending away from the vent hole 2. Specifically, refer to... Figure 8 The vent assembly 4 includes a vent pipe 41 and a pipe connector 42. The axle 32 is a hollow axle, and the first end of the pipe connector 42 is inserted into the vent hole 2 and extends into the cavity of the axle 32. The vent pipe 41 is connected to the vent hole 2, and the inner and outer sides of the axle housing 20 of the drive axle are connected through the vent pipe 41, allowing for real-time pressure relief within the axle housing 20. The first end of the pipe connector 42 is an extended connecting pipe, which can be smooth or threaded, designed to fit the structure of the vent hole 2. The length of the connecting pipe is greater than the thickness of the axle housing 20, and the connecting pipe extends into the cavity of the axle 32 after passing through the vent hole 2. Figure 10 As shown. This configuration allows the inlet of the vent pipe 41 to be hidden in the center of the impeller 31. Due to the rotation of the impeller 31, the lubricating oil 30 will not reach the inlet of the vent pipe 41, effectively preventing oil from entering the vent pipe 41.

[0063] Exhaust process: The gas in the axle housing 20 of the drive axle enters the oil baffle 1 from the oil inlet 12 or the oil outlet 13, passes through the first airflow gap 51 and the second airflow gap 52 in sequence to reach the cavity of the wheel axle 32, and then reaches the inlet of the vent pipe 41, enters the vent pipe 41, and finally exits from the end of the vent pipe 41 away from the vent hole 2.

[0064] Optional, refer to Figure 9 The pipe joint 42 and the vent pipe 41 are connected by a plug-in structure. The plug-in structure includes a mating plug 411 and a plug hole 421. One of the pipe joint 42 and the vent pipe 41 has a plug 411, and the other has a plug hole 421. A tapered sealing surface exists between the plug hole 421 and the plug 411. This arrangement improves the sealing performance between the vent pipe 41 and the pipe joint 42. (Refer to...) Figure 9 In this embodiment, the second end of the pipe connector 42 is provided with a insertion hole 421, and the first end of the vent pipe 41 is provided with a insertion connector 411. The first end of the vent pipe 41 is sealed and inserted into the insertion hole 421 of the pipe connector 42. Optionally, the outer wall of the insertion hole 421 of the pipe connector 42 is provided with threads, and a nut with a shoulder is fitted on the vent pipe 41. The nut threadedly connects and locks the first end of the vent pipe 41 and the first end of the pipe connector 42. The vent pipe 41 is provided with an annular boss that mates with the shoulder of the nut, and the boss and the shoulder of the nut abut and limit each other.

[0065] Optional, refer to Figure 8 The second end of the vent pipe assembly 4 is provided with at least one bent structure 412. Specifically, the bent structure 412 is located at the end of the vent pipe 41 away from the vent hole 2. In this embodiment, the bent structure 412 is arc-shaped, and the extension directions of both ends of the bent structure 412 are arranged perpendicularly. Of course, the bent structure 412 can be other shapes, and the number is not limited. Providing one or more bent structures 412 at the end of the vent pipe 41 away from the vent hole 2 can prevent rainwater from entering the vent pipe 41. The structure of the vent pipe 41 connected to the vent hole 2 is shown in the figure. Figure 3 The vent pipe 41 is positioned diagonally upwards. Compared to the design of installing a one-way valve on the vent hole 2, this invention has a simpler structure and lower manufacturing cost.

[0066] During driving, the gears inside the reducer assembly rotate, and the lubricating oil 30 splashes out due to the agitation of the gears. The splashed lubricating oil 30 forms an oil film on the surface of the gears inside the reducer assembly, which lubricates the gear teeth. The faster the vehicle speed and the faster the gear speed, the more intense the splashing of lubricating oil 30. The splashed lubricating oil 30 enters the inner cavity of the oil baffle 1 from the oil inlet 12. The lubricating oil 30 drives the impeller 31 to rotate around the shaft 32. The rotating blades carry the lubricating oil 30 from the oil inlet side to the oil outlet side, and finally it flows out from the oil outlet 13, preventing the lubricating oil 30 from depositing inside the oil baffle 1.

[0067] Example 2

[0068] An engineering vehicle includes the drive axle exhaust structure described in Embodiment 1.

[0069] Specifically, the engineering vehicles include concrete mixer trucks and dump trucks. Both types of vehicles are used in water-crossing operations. Existing technologies use one-way valves, which are prone to being submerged. If the one-way valve is in the open venting state at this time, external water can also enter the axle housing 20 through the one-way valve vent 2, emulsifying the lubricating oil 30 and causing premature gear failure. This invention, due to the long length of the vent pipe 41 and the presence of at least one bending structure 412 at the second end of the vent pipe 41, effectively prevents the vent at the second end of the vent pipe 41 from being submerged. It also prevents rainwater from flowing back into the vent hole 2, ensuring the normal operation of the vent hole 2 and allowing the pressure inside the drive axle to be discharged in a timely manner, balancing the pressure inside and outside the axle housing 20 of the drive axle.

[0070] Optionally, the second end of the vent pipe 41 is fixed to the frame along the wiring harness. Even in water wading conditions, the vent at the second end of the vent pipe 41 will not be submerged, preventing external water from entering the axle housing 20.

[0071] Based on the above description, this patent application has the following advantages:

[0072] 1. The oil baffle 1 is installed over the vent 2. The oil baffle body 11 can block the splashed lubricating oil 30, preventing the lubricating oil 30 from splashing to the vent 2 and causing the vent 2 to become blocked. This ensures the normal operation of the vent 2 and the air pressure balance in the drive axle housing 20. It will not cause the seal to fail due to the blockage of the vent 2 and the increase in air pressure in the axle housing 20, thus preventing oil leakage. By setting the oil drain assembly 3 in the inner cavity of the oil baffle 1, the rotation of the impeller 31 can drive the lubricating oil 30 entering the oil baffle 1 from the oil inlet 12 to the oil outlet 13 and flow out, ensuring timely oil drainage in the oil baffle 1 and effectively preventing the vent 2 from being blocked by oil.

[0073] 2. The oil inlet 12 and the oil outlet 13 have gradually smaller flow areas along mutually opposing directions. The smaller oil inlet 12 can further prevent lubricating oil 30 from entering the vent hole 2. The oil inlet 12 has a gradually larger flow area into the inner cavity of the oil baffle 1, which can reduce the impact of lubricating oil 30 when it enters the inner cavity of the oil baffle 1, and prevent lubricating oil 30 from splashing secondary inside the oil baffle 1.

[0074] 3. The oil accumulated in the oil baffle 1 can be drained through the oil drain hole 14 to prevent the oil from clogging the vent hole 2;

[0075] 4. The first end of the vent pipe 41 is inserted into the wheel shaft 32, and the vent is hidden in the center of the impeller 31. The rotating impeller 31 discharges the lubricating oil 30, while the lubricating oil 30 cannot reach the vent, so as not to block the vent pipe 41 and cause oil leakage.

[0076] 5. The vent pipe 41 is fixed to the frame to prevent the second end of the vent pipe 41 from being submerged in water; and the second end of the vent pipe 41 is provided with at least one bending structure 412, which can effectively prevent rainwater from entering the vent pipe 41.

[0077] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A drive axle exhaust structure, characterized in that, include: Bridge housing (20), on which ventilation holes (2) are provided. An oil baffle (1) is provided inside the bridge housing (20). The oil baffle (1) is open on one side and covers the vent hole (2). The oil baffle (1) includes an oil baffle body (11). The oil baffle body (11) has an oil inlet (12) and an oil outlet (13) at both ends. The oil inlet (12), the oil outlet (13), the inner cavity of the bridge housing (20), and the vent hole (2) are connected. An oil drain assembly (3) is provided inside the oil baffle (1). The oil drain assembly (3) includes a rotatable impeller (31). The oil inlet (12) and the oil outlet (13) are located on both sides of the impeller (31) in the radial direction. There is an airflow gap between the impeller (31) and the vent (2). The oil discharge assembly (3) also includes a wheel shaft (32), which is mounted on the bridge housing (20), and the impeller (31) is rotatably mounted on the wheel shaft (32); The impeller (31) includes a sleeve (311) and blades (312) spaced circumferentially on the sleeve (311). The sleeve (311) is fitted onto the wheel shaft (32). An annular first airflow gap (51) is formed between the inner circumferential wall of the sleeve (311) and the outer circumferential wall of the wheel shaft (32). The impeller (31) also includes a baffle (313) located at one end of the sleeve (311) near the oil baffle (1), the baffle (313) covering one end face of the cylinder formed by the sleeve (311) and the blade (312). The axle (32) is a hollow shaft, and there is a second airflow gap (52) between the baffle (313) and the first end of the axle (32). The first airflow gap (51), the second airflow gap (52) and the vent (2) are connected.

2. The drive axle exhaust structure according to claim 1, characterized in that, Along the direction in which the oil inlet (12) and the oil outlet (13) are opposite to each other, the flow area of ​​the oil inlet (12) and the oil outlet (13) gradually decreases.

3. The drive axle exhaust structure according to claim 1 or 2, characterized in that, At least one oil drain hole (14) is provided at the lowest position of the oil baffle (1).

4. The drive axle exhaust structure according to claim 1, characterized in that, It also includes a venting tube assembly (4), the first end of which is inserted into the vent hole (2) and extends into the cavity of the wheel axle (32), and the second end of which extends away from the vent hole (2).

5. The drive axle exhaust structure according to claim 4, characterized in that, The second end of the vent pipe assembly (4) is provided with at least one bending structure (412).

6. An engineering vehicle, characterized in that, The drive axle exhaust structure includes any one of claims 1-5.

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