A cleaning device for a steering gear housing

Abstract

The application relates to the technical field of automobile parts cleaning, and particularly discloses a cleaning device for a steering gear housing, which comprises an ultrasonic cleaning tank, a water tank arranged on one side of the ultrasonic cleaning tank and used for collecting bubbling cleaning liquid, a bubble discharging pipe arranged in communication with the top of the water tank, the end of the bubble discharging pipe away from the water tank being in communication with the top end side wall of the cleaning tank, a filter screen arranged in the water tank, the outlet end of the bubble discharging pipe being located above the filter screen, a water pump arranged on the top of the water tank and used for pumping the cleaning liquid in the water tank, the water inlet end of the water pump extending into the water tank, a filter arranged in communication with the water outlet end of the water pump, a liquid discharging pipe arranged at the bottom of the filter, and the liquid discharging pipe being in communication with the ultrasonic cleaning tank. The application has the effects of reducing the use cost of the cleaning liquid and saving resources.

Description

Technical Field

[0001] This application relates to the field of automotive parts cleaning technology, and in particular to a cleaning device for automotive steering gear housings. Background Technology

[0002] In automotive chassis systems, the rotor housing parts need to be precisely assembled with multiple components such as the steering gear and drive rod. After the rotor housing parts are machined, their surface cleanliness has a significant impact on overall performance. Therefore, deep cleaning of debris on the outer wall of the rotor housing parts becomes particularly critical.

[0003] In related technologies, ultrasonic cleaning is typically used to remove dust and impurities from the outer walls of parts. First, the steering gear housing to be cleaned is placed in a cleaning tank filled with cleaning fluid. An ultrasonic generator emits high-frequency sound waves into the cleaning fluid. As these high-frequency sound waves propagate through the cleaning fluid, they generate strong vibrations, causing bubbles to form within the fluid and rapidly burst. This creates a powerful impact force that separates debris and dust from the surface of the parts, thus achieving efficient cleaning. The parts are then blew and dried to remove any residual cleaning fluid.

[0004] In practical use, it has been found that during ultrasonic cleaning, when the fluctuation of the liquid level exceeds the height of the cleaning tank opening, the cleaning fluid will bubble. Impurities will overflow from the cleaning tank along with the bubbling cleaning fluid and flow into the waste liquid tank, thus wasting the cleaning fluid and increasing the cost of use. Utility Model Content

[0005] In order to reduce the cost of cleaning fluid, this application provides a cleaning device for automotive steering gear housing, which has the effect of reducing the cost of cleaning fluid and saving resources.

[0006] The cleaning device for automotive steering gear housing provided in this application adopts the following technical solution: A cleaning device for an automotive steering gear housing includes an ultrasonic cleaning tank. A water tank for collecting bubbling cleaning fluid is provided on one side of the ultrasonic cleaning tank. A defoaming pipe is connected to the top of the water tank, and the end of the defoaming pipe away from the water tank is connected to the top side wall of the cleaning tank. A filter screen is provided inside the water tank, and the outlet end of the defoaming pipe is located above the filter screen. A water pump for drawing cleaning fluid from the water tank is provided at the top of the water tank. The inlet end of the water pump extends into the water tank, and the outlet end of the water pump is connected to a filter. A drain pipe is provided at the bottom of the filter and is connected to the ultrasonic cleaning tank.

[0007] By adopting the above technical solution, the bubbling cleaning solution and impurities are introduced into the water tank from the ultrasonic cleaning tank through the bubble discharge pipe. The impurities are filtered by the filter screen. Then, the water pump draws the cleaning solution with the impurities removed into the filter for secondary filtration. The filtered cleaning solution is returned to the ultrasonic cleaning tank through the drain pipe, realizing the recycling of the cleaning solution, reducing the cost of waste liquid treatment and the cost of using the cleaning solution, and saving resources.

[0008] Optionally, a partition plate is provided along the height direction inside the water tank. The edge of the partition plate is fixedly installed to the inner wall of the water tank. The partition plate divides the inner cavity of the water tank into a first chamber and a second chamber. A connecting port is provided through the bottom of the partition plate to connect the first chamber and the second chamber. The bubble drain pipe is connected to the first chamber. The filter screen is located in the first chamber. A demister is slidably installed along the height direction inside the water tank. The demister is located in the second chamber and at the connecting port. The demister is used to remove foam and impurities in the first chamber. The water inlet of the water pump extends into the second chamber.

[0009] By adopting the above technical solution, the partition plate divides the water tank into an independent first chamber and a second chamber. The first chamber is used to store the filtered cleaning solution, and the demister screen is used to remove the foam in the cleaning solution in the first chamber, thus performing three-stage filtration on the cleaning solution. The second chamber is used to store clean cleaning solution, which effectively improves the cleanliness of the cleaning solution. The water tank integrates filtration, demister, and storage into one integrated structure, which effectively reduces the cost of consumables and saves resources.

[0010] Optionally, the top of the water tank is provided with a first support plate and a second support plate. The first support plate is located at the top opening of the first chamber, and the second support plate is located at the top opening of the second chamber. The first support plate is provided with a first handle, and the second support plate is provided with a second handle.

[0011] By adopting the above technical solution, the first support plate and the second support plate help reduce the amount of external dust and impurities falling into the chamber, while protecting the filter screen and demister screen in the chamber and reducing mechanical wear. Operators can easily maintain and replace the filter screen and demister screen in the chamber by holding the handle, reducing manual operation costs.

[0012] Optionally, an oil scraper is provided on the first support plate, an oil storage tank is provided on the side wall of the water tank, the oil outlet of the oil scraper is connected to the oil storage tank through a pipe, and the oil-adhesive strip on the oil scraper extends vertically into the first chamber.

[0013] By adopting the above technical solution, the oil skimmer can adsorb the floating oil on the surface of the cleaning fluid through the oil-adhesive belt and collect it through the oil storage tank, reducing the amount of floating oil entering the second chamber and effectively improving the cleanliness of the cleaning fluid.

[0014] Optionally, the side wall of the ultrasonic cleaning tank is provided with a first liquid level sensor for monitoring the liquid level height inside the ultrasonic cleaning tank, and the side wall of the water tank is provided with a second liquid level sensor for monitoring the liquid level inside the water tank.

[0015] By adopting the above technical solution, the first liquid level sensor can detect the liquid level in the ultrasonic cleaning tank. If the liquid level is lower than the liquid level of the parts being cleaned, cleaning fluid can be added to the ultrasonic cleaning tank through the filter and drain pipe. The second liquid level sensor can detect the liquid level in the water tank. If the liquid level in the water tank is too low, the water pump can be controlled to stop pumping, ensuring the safe operation of the water pump.

[0016] Optionally, several temperature sensors are installed inside the ultrasonic cleaning tank.

[0017] By adopting the above technical solution, the temperature sensor can easily monitor the temperature inside the ultrasonic cleaning tank, reducing the possibility of dry burning due to insufficient cleaning fluid.

[0018] Optionally, a support frame is provided inside the water tank, the upper surface of which abuts against the bottom of the second support plate, and the support frame is used to support the water pump.

[0019] By adopting the above technical solution, the support frame provides support for the water pump, reduces the shaking of the water pump on the second support plate, and helps to improve the stability of the water pump.

[0020] Optionally, a check valve is provided on the drain pipe.

[0021] By adopting the above technical solution, the check valve can prevent the cleaning fluid in the water tank from continuously flowing into the ultrasonic cleaning tank, and it is also convenient to control the flow rate of the cleaning fluid in the filter flowing back into the ultrasonic cleaning tank, thus improving the adaptability of the equipment.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The bubbling cleaning solution and impurities are introduced into the water tank from the ultrasonic cleaning tank through the bubble drain pipe. The impurities are filtered by the filter screen. Then, the water pump draws the cleaning solution with the impurities removed into the filter for secondary filtration. The filtered cleaning solution is returned to the ultrasonic cleaning tank through the drain pipe, realizing the recycling of the cleaning solution, reducing the cost of waste liquid treatment and the cost of using the cleaning solution, and saving resources. 2. The partition plate divides the water tank into two independent chambers: the first chamber stores the filtered cleaning solution, and the demister screen removes foam from the cleaning solution in the first chamber, performing three-stage filtration. The second chamber stores the clean cleaning solution, effectively improving the cleanliness of the cleaning solution. The water tank integrates filtration, demistering, and storage into a single structure, effectively reducing the cost of consumables and saving resources. 3. The oil skimmer can absorb the floating oil on the surface of the cleaning fluid through the oil-adhesive belt and collect it through the oil storage tank, reducing the amount of floating oil entering the second chamber and effectively improving the cleanliness of the cleaning fluid. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the cleaning device for the automotive steering gear housing in this application; Figure 2 This is a schematic diagram showing the internal structure of the water tank of the cleaning device for the automotive steering gear housing in this application; Figure 3 This is a schematic diagram showing the external structure of the water tank of the cleaning device for the automotive steering gear housing in this application; Figure 4 This is a schematic diagram showing the flow channel structure of the ultrasonic cleaning tank in the cleaning device for the automotive steering gear housing of this application.

[0024] Reference numerals: 1. Ultrasonic cleaning tank; 2. Water tank; 3. Foam drain pipe; 4. Filter screen; 5. Water pump; 6. Filter; 7. Drain pipe; 8. Partition plate; 81. First partition plate; 82. Second partition plate; 9. First chamber; 10. Second chamber; 11. Connecting port; 12. Defoaming screen; 13. First support plate; 131. First baffle; 132. Second baffle; 133. Third baffle; 14. Second support plate; 141. Fixed plate; 142. Movable plate; 15. First handle; 151. First grip. 152. Second grip; 16. Second handle; 17. Oil scraper; 18. Oil tank; 19. Fixing platform; 20. First liquid level sensor; 21. Second liquid level sensor; 22. Temperature sensor; 23. Support frame; 24. Check valve; 25. Connecting pipe; 26. Inlet pipe; 27. Side flange; 28. Serrated part; 29. ​​Flow channel; 30. First snap-fit ​​part; 31. Second snap-fit ​​part; 32. Slide rail; 33. Handle; 34. Fixing frame; 35. Waist-shaped hole; 36. Foam outlet; 37. Oil scraper outlet. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0026] This application discloses a cleaning device for an automotive steering gear housing, referring to... Figure 1 , Figure 2 and Figure 3 The system includes an ultrasonic cleaning tank 1, with a degassing pipe 3 connected to the top side wall of the ultrasonic cleaning tank 1. The end of the degassing pipe 3 away from the ultrasonic cleaning tank 1 is connected to a water tank 2, which is located to one side of the ultrasonic cleaning tank 1. The degassing pipe 3 is located above the water tank 2. A filter screen 4 is installed inside the water tank 2, with the end of the degassing pipe 3 away from the ultrasonic cleaning tank 1 located above the filter screen 4. A water pump 5 is installed on the top of the water tank 2, used to draw cleaning fluid from the water tank 2. The inlet of the water pump 5 extends into the water tank 2, and the outlet of the water pump 5 is connected to a connecting pipe 25. The end of the connecting pipe 25 away from the water pump 5 is connected to the inlet at the top of a filter 6, and the outlet at the bottom of the filter 6 is connected to a drain pipe 7. The end of the drain pipe 7 away from the filter 6 is connected to the ultrasonic cleaning tank 1.

[0027] When impurities flow into the water tank 2 along with the bubble-containing cleaning solution through the bubble drain pipe 3, the filter screen 4 performs primary separation filtration of the impurities. The bubble-free cleaning solution, without the impact of ultrasonic vibration, becomes a bubble-free cleaning solution. Then, the cleaning solution is pumped into the filter 6 by the water pump 5. The filter 6 performs secondary filtration of the cleaning solution before it is discharged into the ultrasonic cleaning tank 1. This achieves secondary recycling of the cleaning solution, reduces the cost of using the cleaning solution, and saves resources.

[0028] Reference Figure 1 and Figure 4 The ultrasonic cleaning tank 1 has an inlet pipe 26 connected to its side wall for supplying cleaning fluid into the ultrasonic cleaning tank 1. A baffle 27 is welded and fixed to the top outer periphery of the ultrasonic cleaning tank 1. The height of the baffle 27 is greater than the height of the cleaning tank. A serrated part 28 is provided at the top of the wall of the ultrasonic cleaning tank 1 along the circumference. The baffle 27 forms an annular flow channel 29 along the circumference of the cleaning tank. The end of the bubble drain pipe 3 away from the water tank 2 is connected to the flow channel 29. When the bubbling cleaning fluid and impurities overflow from the cleaning tank, they will flow into the flow channel 29. The serrated part 28 accelerates the discharge speed of the bubbling water and impurities.

[0029] Reference Figure 2 A partition plate 8 is installed in the water tank 2 along the height direction. In this embodiment, the partition plate 8 is L-shaped, and both sides of the partition plate 8 are welded and fixed to the inner wall of the water tank 2. The partition plate 8 divides the inner cavity of the water tank 2 into a first chamber 9 and a second chamber 10. The end of the bubble drain pipe 3 away from the ultrasonic cleaning tank 1 is connected to the first chamber 9. The partition plate 8 includes a first partition plate 81 and a second partition plate 82. The first partition plate 81 and the second partition plate 82 are perpendicular. The side of the first partition plate 81 away from the second partition plate 82 is fixed to the inner wall of the water tank 2, and the side of the second partition plate 82 away from the first partition plate 81 is fixed to the inner wall of the water tank 2.

[0030] Reference Figure 2The first partition 81 has a first snap-fit ​​portion 30 integrally formed on the side of the top facing the first chamber 9, and the first snap-fit ​​portion 30 is arranged along the length direction of the first partition 81; the water tank 2 has a second snap-fit ​​portion 31 integrally formed on the inner wall near the first partition 81, and the second snap-fit ​​portion 31 is arranged along the length direction of the water tank 2, and the first snap-fit ​​portion 30 and the second snap-fit ​​portion 31 are parallel to each other; the filter screen 4 is located in the first chamber 9, and the two sides of the filter screen 4 are respectively snap-fitted with the first snap-fit ​​portion 30 and the second snap-fit ​​portion 31, and the two sides of the filter screen 4 can slide on the first snap-fit ​​portion 30 and the second snap-fit ​​portion 31; by sliding the filter screen 4, it is convenient to adjust the position of the filter screen 4, and it is also convenient to install and remove the filter screen 4.

[0031] Reference Figure 2 The bottom of the second partition 82 has a through-hole 11, which allows the first chamber 9 and the second chamber 10 to communicate with each other. Two opposing slide rails 32 are welded and fixed inside the water tank 2 along its height direction. Both slide rails 32 are located inside the second chamber 10 and are welded and fixed to the inner wall of the water tank 2 on the side close to the first partition 81. A demister 12 is installed inside the water tank 2 along its height direction. The demister 12 is located at the through-hole 11 and is used to filter out the foam of the cleaning fluid entering the second chamber 10 from the first chamber 9 in a three-stage filtration process. The two ends of the demister 12 are slidably connected to the slide rails 32. A handle 33 is welded and fixed to the top of the demister 12. By holding the handle 33 and pulling the demister 12 upward, it is easy to clean the foam on the demister 12 and also easy to replace the demister 12.

[0032] Reference Figure 3 A fixing frame 34 is installed on the top of the water tank 2 along its width direction. The fixing frame 34 is perpendicular to the first partition 81. The two ends of the fixing frame 34 are fixedly connected to the water tank 2 by bolts. The fixing frame 34 is located on the top of the second partition 82. A waist-shaped hole 35 is opened on the fixing frame 34 along its length direction. The length of the waist-shaped hole 35 is greater than the length of the demister 12. The handle 33 is located above the fixing frame 34. By pulling the handle 33 upward, the demister 12 can be made to pass through the waist-shaped hole 35.

[0033] Reference Figure 3The top of the water tank 2 is equipped with a first support plate 13 and a second support plate 14. The first support plate 13 is located at the top of the first chamber 9, and the second support plate 14 is located at the top of the second chamber 10. The first support plate 13 includes a first baffle 131, a second baffle 132, and a third baffle 133. The two ends of the first baffle 131 are respectively engaged with the fixing frame 34 and the inner wall of the water tank 2. The first baffle 131 has a foam discharge port 36 for the foam discharge pipe 3 to pass through. The second baffle 132 is located on the side of the fixing frame 34 away from the first baffle 131. The two ends of the second baffle 132 are respectively fixed to the fixing frame 34 and the inner wall of the water tank 2 by bolts. The third baffle 133 is located on the same side as the second baffle 132. The two ends of the third baffle 133 are respectively engaged with the fixing frame 34 and the inner wall of the water tank 2.

[0034] Reference Figure 2 and Figure 3 The first handle 15 includes a first grip 151 and a second grip 152. The first grip 151 is welded and fixed to the top of the first baffle 131, and the second grip 152 is welded and fixed to the top of the third baffle 133. This makes it easy to remove the first baffle 131 or the third baffle 133 from the top of the water tank 2, which is beneficial for viewing the filter screen 4 and the liquid condition in the first chamber 9.

[0035] Reference Figure 3 An oil scraper 17 is fixedly installed on the second baffle 132. The oil scraper 17 is located at the top of the first chamber 9. An oil scraping port 37 is opened on the second baffle 132 for the oil scraping band of the oil scraper 17 to pass through. A fixed platform 19 is welded and fixed to the outer wall of the water tank 2. An oil storage tank 18 is placed on the fixed platform 19. The oil outlet of the oil scraper 17 is connected to the oil storage tank 18 through a pipe. The oil scraper 17 scrapes the floating oil on the surface of the cleaning fluid and collects it through the oil storage tank 18. This facilitates the cleaning of floating oil and other impurities and helps to improve the cleanliness of the cleaning fluid.

[0036] Refer to 2 and Figure 3 The second support plate 14 includes a fixed plate 141 and a movable plate 142. The fixed plate 141, the movable plate 142 and the first baffle 131 are located on the same side. The fixed plate 141 is located between the first baffle 131 and the movable plate 142. The two ends of the fixed plate 141 are fixedly connected to the fixed frame 34 and the inner wall of the water tank 2 by bolts, respectively. The two ends of the movable plate 142 are respectively engaged with the fixed frame 34 and the inner wall of the water tank 2. The fixed plate 141 and the movable plate 142 are respectively provided with a semi-circular first opening and a second opening on the side close to each other. The first opening and the second opening are combined to form a circle, which makes it easy for the water inlet end of the water pump 5 to extend into the second chamber 10. A second handle 16 is welded and fixed on the movable plate 142, which makes it easy to take the movable plate 142 out from the top of the water tank 2, which is beneficial to check the liquid condition in the second chamber 10.

[0037] Reference Figure 1 and Figure 2 A support frame 23 is installed inside the water tank 2 along its height direction. The support frame 23 is located inside the second chamber 10. The demister 12 is located between the second partition 82 and the support frame 23. The water inlet end of the water pump 5 extends into the support frame 23. The top of the support frame 23 abuts against the fixed plate 141 and the movable plate 142. The water pump 5 is located above the support frame 23, which facilitates providing stable support for the water pump 5.

[0038] Reference Figure 1 and Figure 4 A first liquid level sensor 20 is fixedly installed on the side wall of the ultrasonic cleaning tank 1 near the water tank 2 to facilitate monitoring the liquid level in the ultrasonic cleaning tank 1; a second liquid level sensor 21 is fixedly installed on the side wall of the water tank 2 near the filter 6 to facilitate monitoring the liquid level in the water tank 2; when the first liquid level sensor 20 detects that the liquid level in the ultrasonic cleaning tank 1 has not reached the cleaning liquid level, the second liquid level sensor 21 monitors the liquid level in the water tank 2 to facilitate timely supply of liquid to the ultrasonic cleaning tank 1 and realize the recycling of the cleaning liquid.

[0039] Reference Figure 4 Temperature sensors 22 are fixedly installed on the side wall and bottom of the ultrasonic cleaning tank 1. In this embodiment, two temperature sensors 22 are provided to facilitate timely monitoring of the temperature inside the ultrasonic cleaning tank 1 and reduce the occurrence of dry burning inside the ultrasonic cleaning tank 1.

[0040] Reference Figure 4 A check valve 24 is fixedly installed on the drain pipe 7 to facilitate the control of the outflow of cleaning fluid in the filter 6 and the outflow of liquid in the ultrasonic cleaning tank 1.

[0041] The implementation principle of the cleaning device for a car steering gear housing disclosed in this application is as follows: When the liquid level in the ultrasonic cleaning tank 1 is greater than the height of the serrated part 28, the impurities on the top of the liquid surface flow into the defoaming pipe 3 through the flow channel 29 along with the bubbling cleaning liquid. Then, the impurities are filtered through the filter screen 4 for primary filtration. The bubbling cleaning liquid then flows into the first chamber 9, where the oil skimmer 17 removes the floating oil on the surface of the cleaning liquid. The cleaning liquid then passes through the defoaming screen 12 to remove the foam on the surface of the cleaning liquid and is then introduced into the second chamber 10. The water pump 5 draws the clean cleaning liquid in the second chamber 10 into the filter 6 for secondary filtration. Finally, the clean cleaning liquid in the filter 6 is introduced into the ultrasonic cleaning tank 1 through the drain pipe 7, realizing the recycling of the cleaning liquid, effectively reducing the cost of using the cleaning liquid and saving resources.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cleaning device for an automotive steering gear housing, comprising an ultrasonic cleaning tank (1), characterized in that: A water tank (2) for collecting bubbling cleaning fluid is provided on one side of the ultrasonic cleaning tank (1). A defoaming pipe (3) is connected to the top of the water tank (2). The end of the defoaming pipe (3) away from the water tank (2) is connected to the top side wall of the cleaning tank. A filter screen (4) is provided inside the water tank (2). The outlet end of the defoaming pipe (3) is located above the filter screen (4). A water pump (5) for drawing cleaning fluid from the water tank (2) is provided on the top of the water tank (2). The inlet end of the water pump (5) extends into the water tank (2). A filter (6) is connected to the outlet end of the water pump (5). A drain pipe (7) is provided at the bottom of the filter (6). The drain pipe (7) is connected to the ultrasonic cleaning tank (1).

2. The cleaning device for the automotive steering gear housing according to claim 1, characterized in that, A partition plate (8) is provided in the water tank (2) along the height direction. The edge of the partition plate (8) is fixed to the inner wall of the water tank (2). The partition plate (8) divides the inner cavity of the water tank (2) into a first chamber (9) and a second chamber (10). A connecting port (11) is provided through the bottom of the partition plate (8). The connecting port (11) is used to connect the first chamber (9) and the second chamber (10). The bubble drain pipe (3) is connected to the first chamber (9). The filter screen (4) is located in the first chamber (9). A defoaming screen (12) is slidably provided in the water tank (2) along the height direction. The defoaming screen (12) is located in the second chamber (10). The defoaming screen (12) is located at the connecting port (11). The defoaming screen (12) is used to remove foam impurities in the first chamber (9). The water inlet end of the water pump (5) extends into the second chamber (10).

3. The cleaning device for the automotive steering gear housing according to claim 2, characterized in that, The water tank (2) is provided with a first support plate (13) and a second support plate (14) on the top. The first support plate (13) is located at the top opening of the first chamber (9), and the second support plate (14) is located at the top opening of the second chamber (10). The first support plate (13) is provided with a first handle (15), and the second support plate (14) is provided with a second handle (16).

4. The cleaning device for the automotive steering gear housing according to claim 3, characterized in that, An oil scraper (17) is provided on the first support plate (13), and an oil storage tank (18) is provided on the side wall of the water tank (2). The oil outlet of the oil scraper (17) is connected to the oil storage tank (18) through a pipe, and the oil-adhesive strip on the oil scraper (17) extends vertically into the first chamber (9).

5. The cleaning device for the automotive steering gear housing according to claim 1, characterized in that, The side wall of the ultrasonic cleaning tank (1) is provided with a first liquid level sensor (20) for monitoring the liquid level in the ultrasonic cleaning tank (1), and the side wall of the water tank (2) is provided with a second liquid level sensor (21) for monitoring the liquid level in the water tank (2).

6. The cleaning device for the automotive steering gear housing according to claim 1, characterized in that, Several temperature sensors (22) are installed inside the ultrasonic cleaning tank (1).

7. The cleaning device for the automotive steering gear housing according to claim 3, characterized in that, The water tank (2) is provided with a support frame (23), the upper surface of which abuts against the bottom of the second support plate (14), and the support frame (23) is used to support the water pump (5).

8. The cleaning device for the automotive steering gear housing according to claim 1, characterized in that, A check valve (24) is installed on the drain pipe (7).

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